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revision 1.1.2.9, Thu May 22 22:17:44 2003 UTC revision 1.7, Sun Mar 27 03:59:42 2005 UTC
# Line 1  Line 1 
1  /******************************************************************************  /******************************************************************************
2   *   *
3   * XviD Bit Rate Controller Library   * XviD Bit Rate Controller Library
4   * - VBR 2 pass bitrate controler implementation -   *  - VBR 2 pass bitrate controller implementation -
5   *   *
6   * Copyright (C)      2002 Foxer <email?>   * Copyright (C)      2002 Foxer <email?>
7   *                    2002 Dirk Knop <dknop@gwdg.de>   *                    2002 Dirk Knop <dknop@gwdg.de>
# Line 29  Line 29 
29   *   *
30   *****************************************************************************/   *****************************************************************************/
31    
32    #define BQUANT_PRESCALE
33    #undef COMPENSATE_FORMULA
34    
35    /* forces second pass not to be bigger than first */
36    #undef PASS_SMALLER
37    
38    /* automatically alters overflow controls (strength and improvement/degradation)
39            to fight most common problems without user's knowladge */
40    #define SMART_OVERFLOW_SETTING
41    
42  #include <stdio.h>  #include <stdio.h>
43  #include <math.h>  #include <math.h>
44  #include <limits.h>  #include <limits.h>
45    
 #define RAD2DEG 57.295779513082320876798154814105  
 #define DEG2RAD 0.017453292519943295769236907684886  
   
46  #include "../xvid.h"  #include "../xvid.h"
47  #include "../image/image.h"  #include "../image/image.h"
48    
49    /*****************************************************************************
50     * Some default settings
51     ****************************************************************************/
52    
53    #define DEFAULT_KEYFRAME_BOOST 0
54    #define DEFAULT_OVERFLOW_CONTROL_STRENGTH 10
55    #define DEFAULT_CURVE_COMPRESSION_HIGH 0
56    #define DEFAULT_CURVE_COMPRESSION_LOW 0
57    #define DEFAULT_MAX_OVERFLOW_IMPROVEMENT 10
58    #define DEFAULT_MAX_OVERFLOW_DEGRADATION 10
59    
60    /* Keyframe settings */
61    #define DEFAULT_KFREDUCTION 20
62    #define DEFAULT_KFTHRESHOLD 1
63    
64    /*****************************************************************************
65     * Some default constants (can be tuned)
66     ****************************************************************************/
67    
68    /* Specify the invariant part of the headers bits (header+MV)
69     * as  hlength/cst */
70    #define INVARIANT_HEADER_PART_IVOP 1 /* factor 1.0f   */
71    #define INVARIANT_HEADER_PART_PVOP 2 /* factor 0.5f   */
72    #define INVARIANT_HEADER_PART_BVOP 8 /* factor 0.125f */
73    
74    /*****************************************************************************
75     * Structures
76     ****************************************************************************/
77    
78    /* Statistics */
79  typedef struct {  typedef struct {
80      int type;               /* first pass type */      int type;               /* first pass type */
81      int quant;              /* first pass quant */      int quant;              /* first pass quant */
82          int blks[3];                    /* k,m,y blks */          int blks[3];                    /* k,m,y blks */
83      int length;             /* first pass length */      int length;             /* first pass length */
84            int invariant;          /* what we assume as being invariant between the two passes, it's a sub part of header + MV bits */
85      int scaled_length;      /* scaled length */      int scaled_length;      /* scaled length */
86      int desired_length;     /* desired length; calcuated during encoding */          int desired_length;     /* desired length; calculated during encoding */
87            int error;
88    
89      int zone_mode;   /* XVID_ZONE_xxx */      int zone_mode;   /* XVID_ZONE_xxx */
90      double weight;      double weight;
91  } stat_t;  } twopass_stat_t;
   
   
   
92    
93  /* context struct */  /* Context struct */
94  typedef struct  typedef struct
95  {  {
96      xvid_plugin_2pass2_t param;      xvid_plugin_2pass2_t param;
97    
98      /* constant statistical data */          /*----------------------------------
99             * constant statistical data
100             *--------------------------------*/
101    
102            /* Number of frames of the sequence */
103          int num_frames;          int num_frames;
104    
105            /* Number of Intra frames of the sequence */
106      int num_keyframes;      int num_keyframes;
     uint64_t target;    /* target filesize */  
107    
108      int count[3];   /* count of each frame types */          /* Target filesize to reach */
109      uint64_t tot_length[3];  /* total length of each frame types */          uint64_t target;
     double avg_length[3];   /* avg */  
     int min_length[3];  /* min frame length of each frame types */  
     uint64_t tot_scaled_length[3];  /* total scaled length of each frame type */  
     int max_length;     /* max frame size */  
   
     /* zone statistical data */  
     double avg_weight;  /* average weight */  
     int64_t tot_quant;   /* total length used by XVID_ZONE_QUANT zones */  
   
   
     double curve_comp_scale;  
     double movie_curve;  
   
         double alt_curve_low;  
         double alt_curve_high;  
         double alt_curve_low_diff;  
         double alt_curve_high_diff;  
     double alt_curve_curve_bias_bonus;  
         double alt_curve_mid_qual;  
         double alt_curve_qual_dev;  
110    
111      /* dynamic */          /* Count of each frame types */
112            int count[3];
113    
114            /* Total length of each frame types (1st pass) */
115            uint64_t tot_length[3];
116            uint64_t tot_invariant[3];
117    
118            /* Average length of each frame types (used first for 1st pass data and
119             * then for scaled averages */
120            double avg_length[3];
121    
122            /* Minimum frame length allowed for each frame type */
123            int min_length[3];
124    
125            /* Total bytes per frame type once the curve has been scaled
126             * NB: advanced parameters do not change this value. This field
127             *     represents the total scaled w/o any advanced settings */
128            uint64_t tot_scaled_length[3];
129    
130            /* Maximum observed frame size observed during the first pass, the RC
131             * will try tp force all frame sizes in the second pass to be under that
132             * limit */
133            int max_length;
134    
135            /*----------------------------------
136             * Zones statistical data
137             *--------------------------------*/
138    
139            /* Total length used by XVID_ZONE_QUANT zones */
140            uint64_t tot_quant;
141            uint64_t tot_quant_invariant;
142    
143            /* Holds the total amount of frame bytes, zone weighted (only scalable
144             * part of frame bytes) */
145            uint64_t tot_weighted;
146    
147            /*----------------------------------
148             * Advanced settings helper ratios
149             *--------------------------------*/
150    
151            /* This the ratio that has to be applied to all p/b frames in order
152             * to reserve/retrieve bits for/from keyframe boosting and consecutive
153             * keyframe penalty */
154            double pb_iboost_tax_ratio;
155    
156            /* This the ratio to apply to all b/p frames in order to respect the
157             * assymetric curve compression while respecting a target filesize
158             * NB: The assymetric delta gain has to be computed before this ratio
159             *     is applied, and then the delta is added to the scaled size */
160            double assymetric_tax_ratio;
161    
162            /*----------------------------------
163             * Data from the stats file kept
164             * into RAM for easy access
165             *--------------------------------*/
166    
167            /* Array of keyframe locations
168             * eg: rc->keyframe_locations[100] returns the frame number of the 100th
169             *     keyframe */
170      int * keyframe_locations;      int * keyframe_locations;
     stat_t * stats;  
171    
172      double pquant_error[32];          /* Index of the last keyframe used in the keyframe_location */
173      double bquant_error[32];          int KF_idx;
174      int quant_count[32];  
175            /* Array of all 1st pass data file -- see the twopass_stat_t structure
176             * definition for more details */
177            twopass_stat_t * stats;
178    
179            /*----------------------------------
180             * Hysteresis helpers
181             *--------------------------------*/
182    
183            /* This field holds the int2float conversion errors of each quant per
184             * frame type, this allow the RC to keep track of rouding error and thus
185             * increase or decrease the chosen quant according to this residue */
186            double quant_error[3][32];
187    
188            /* This fields stores the count of each quant usage per frame type
189             * No real role but for debugging */
190            int quant_count[3][32];
191    
192            /* Last valid quantizer used per frame type, it allows quantizer
193             * increament/decreament limitation in order to avoid big image quality
194             * "jumps" */
195      int last_quant[3];      int last_quant[3];
196    
197      double curve_comp_error;          /*----------------------------------
198      int overflow;           * Overflow control
199      int KFoverflow;           *--------------------------------*/
200      int KFoverflow_partial;  
201      int KF_idx;          /* Current overflow that has to be distributed to p/b frames */
202            double overflow;
203    
204            /* Total overflow for keyframes -- not distributed directly */
205            double KFoverflow;
206    
207            /* Amount of keyframe overflow to introduce to the global p/b frame
208             * overflow counter at each encoded frame */
209            double KFoverflow_partial;
210    
211            /* Unknown ???
212             * ToDo: description */
213      double fq_error;      double fq_error;
 } rc_2pass2_t;  
214    
215            int min_quant; /* internal minimal quant, prevents wrong quants from being used */
216    
217            /*----------------------------------
218  #define BUF_SZ 1024           * Debug
219  #define MAX_COLS    5           *--------------------------------*/
220            double desired_total;
221            double real_total;
222    } rc_2pass2_t;
223    
224    
225  /* open stats file, and count num frames */  /*****************************************************************************
226     * Sub plugin functions prototypes
227     ****************************************************************************/
228    
229    static int rc_2pass2_create(xvid_plg_create_t * create, rc_2pass2_t ** handle);
230    static int rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data);
231    static int rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data);
232    static int rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy);
233    
234    /*****************************************************************************
235     * Plugin definition
236     ****************************************************************************/
237    
238  static int det_stats_length(rc_2pass2_t * rc, char * filename)  int
239    xvid_plugin_2pass2(void * handle, int opt, void * param1, void * param2)
240  {  {
241      FILE * f;          switch(opt) {
242      int n, ignore;          case XVID_PLG_INFO :
243      char type;          case XVID_PLG_FRAME :
   
     rc->num_frames = 0;  
     rc->num_keyframes = 0;  
   
     if ((f = fopen(filename, "rt")) == NULL)  
244          return 0;          return 0;
245    
246      while((n = fscanf(f, "%c %d %d %d %d %d %d\n",          case XVID_PLG_CREATE :
247          &type, &ignore, &ignore, &ignore, &ignore, &ignore, &ignore)) != EOF) {                  return rc_2pass2_create((xvid_plg_create_t*)param1, param2);
         if (type == 'i') {  
             rc->num_frames++;  
             rc->num_keyframes++;  
         }else if (type == 'p' || type == 'b' || type == 's') {  
             rc->num_frames++;  
         }  
     }  
248    
249      fclose(f);          case XVID_PLG_DESTROY :
250                    return rc_2pass2_destroy((rc_2pass2_t*)handle, (xvid_plg_destroy_t*)param1);
251    
252            case XVID_PLG_BEFORE :
253                    return rc_2pass2_before((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);
254    
255      return 1;          case XVID_PLG_AFTER :
256                    return rc_2pass2_after((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);
257  }  }
258    
259            return XVID_ERR_FAIL;
260    }
261    
262    /*****************************************************************************
263     * Sub plugin functions definitions
264     ****************************************************************************/
265    
266    /* First a few local helping function prototypes */
267    static  int statsfile_count_frames(rc_2pass2_t * rc, char * filename);
268    static  int statsfile_load(rc_2pass2_t *rc, char * filename);
269    static void zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create);
270    static void first_pass_stats_prepare_data(rc_2pass2_t * rc);
271    static void first_pass_scale_curve_internal(rc_2pass2_t *rc);
272    static void scaled_curve_apply_advanced_parameters(rc_2pass2_t * rc);
273    static  int check_curve_for_vbv_compliancy(rc_2pass2_t * rc, const float fps);
274    static  int scale_curve_for_vbv_compliancy(rc_2pass2_t * rc, const float fps);
275    #if 0
276    static void stats_print(rc_2pass2_t * rc);
277    #endif
278    
279  /* open stats file(s) and read into rc->stats array */  /*----------------------------------------------------------------------------
280     *--------------------------------------------------------------------------*/
281    
282  static int load_stats(rc_2pass2_t *rc, char * filename)  static int
283    rc_2pass2_create(xvid_plg_create_t * create, rc_2pass2_t **handle)
284  {  {
285      FILE * f;          xvid_plugin_2pass2_t * param = (xvid_plugin_2pass2_t *)create->param;
286      int i, not_scaled;          rc_2pass2_t * rc;
287            int i;
288    
289      if ((f = fopen(filename, "rt"))==NULL)          rc = malloc(sizeof(rc_2pass2_t));
290          return 0;          if (rc == NULL)
291                    return XVID_ERR_MEMORY;
292    
293      i = 0;          /* v1.0.x */
294          not_scaled = 0;          rc->param.version = param->version;
295      while(i < rc->num_frames) {          rc->param.bitrate = param->bitrate;
296          stat_t * s = &rc->stats[i];          rc->param.filename = param->filename;
297          int n;          rc->param.keyframe_boost = param->keyframe_boost;
298          char type;          rc->param.curve_compression_high = param->curve_compression_high;
299            rc->param.curve_compression_low = param->curve_compression_low;
300            rc->param.overflow_control_strength = param->overflow_control_strength;
301            rc->param.max_overflow_improvement = param->max_overflow_improvement;
302            rc->param.max_overflow_degradation = param->max_overflow_degradation;
303            rc->param.kfreduction = param->kfreduction;
304            rc->param.kfthreshold = param->kfthreshold;
305            rc->param.container_frame_overhead = param->container_frame_overhead;
306    
307            if (XVID_VERSION_MINOR(param->version) >= 1) {
308                    rc->param.vbv_size = param->vbv_size;
309                    rc->param.vbv_initial = param->vbv_initial;
310                    rc->param.vbv_maxrate = param->vbv_maxrate;
311                    rc->param.vbv_peakrate = param->vbv_peakrate;
312            }else{
313                    rc->param.vbv_size =
314                    rc->param.vbv_initial =
315                    rc->param.vbv_maxrate =
316                    rc->param.vbv_peakrate = 0;
317            }
318    
319            /* Initialize all defaults */
320    #define _INIT(a, b) if((a) <= 0) (a) = (b)
321            /* Let's set our defaults if needed */
322            _INIT(rc->param.keyframe_boost, DEFAULT_KEYFRAME_BOOST);
323            _INIT(rc->param.overflow_control_strength, DEFAULT_OVERFLOW_CONTROL_STRENGTH);
324            _INIT(rc->param.curve_compression_high, DEFAULT_CURVE_COMPRESSION_HIGH);
325            _INIT(rc->param.curve_compression_low, DEFAULT_CURVE_COMPRESSION_LOW);
326            _INIT(rc->param.max_overflow_improvement, DEFAULT_MAX_OVERFLOW_IMPROVEMENT);
327            _INIT(rc->param.max_overflow_degradation,  DEFAULT_MAX_OVERFLOW_DEGRADATION);
328    
329            /* Keyframe settings */
330            _INIT(rc->param.kfreduction, DEFAULT_KFREDUCTION);
331            _INIT(rc->param.kfthreshold, DEFAULT_KFTHRESHOLD);
332    #undef _INIT
333    
334                  s->scaled_length = 0;          /* Initialize some stuff to zero */
335          n = fscanf(f, "%c %d %d %d %d %d %d\n", &type, &s->quant, &s->blks[0], &s->blks[1], &s->blks[2], &s->length, &s->scaled_length);          for(i=0; i<3; i++) {
336          if (n == EOF) break;                  int j;
337                  if (n < 7) {                  for (j=0; j<32; j++) {
338                          not_scaled = 1;                          rc->quant_error[i][j] = 0;
339                            rc->quant_count[i][j] = 0;
340                  }                  }
   
         if (type == 'i') {  
             s->type = XVID_TYPE_IVOP;  
         }else if (type == 'p' || type == 's') {  
             s->type = XVID_TYPE_PVOP;  
         }else if (type == 'b') {  
             s->type = XVID_TYPE_BVOP;  
         }else{  /* unknown type */  
             DPRINTF(XVID_DEBUG_RC, "unknown stats frame type; assuming pvop\n");  
             s->type = XVID_TYPE_PVOP;  
341          }          }
342    
343          i++;          for (i=0; i<3; i++) rc->last_quant[i] = 0;
344    
345            rc->fq_error = 0;
346            rc->min_quant = 1;
347    
348            /* Count frames (and intra frames) in the stats file, store the result into
349             * the rc structure */
350            if (statsfile_count_frames(rc, param->filename) == -1) {
351                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- ERROR: fopen %s failed\n", param->filename);
352                    free(rc);
353                    return(XVID_ERR_FAIL);
354      }      }
355    
356      rc->num_frames = i;          /* Allocate the stats' memory */
357            if ((rc->stats = malloc(rc->num_frames * sizeof(twopass_stat_t))) == NULL) {
358                    free(rc);
359                    return(XVID_ERR_MEMORY);
360            }
361    
362          fclose(f);          /* Allocate keyframes location's memory
363             * PS: see comment in pre_process0 for the +1 location requirement */
364            rc->keyframe_locations = malloc((rc->num_keyframes + 1) * sizeof(int));
365            if (rc->keyframe_locations == NULL) {
366                    free(rc->stats);
367                    free(rc);
368                    return(XVID_ERR_MEMORY);
369            }
370    
371      return 1;          /* Load the first pass stats */
372            if (statsfile_load(rc, param->filename) == -1) {
373                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- ERROR: fopen %s failed\n", param->filename);
374                    free(rc->keyframe_locations);
375                    free(rc->stats);
376                    free(rc);
377                    return XVID_ERR_FAIL;
378  }  }
379    
380            /* Compute the target filesize */
381            if (rc->param.bitrate<0) {
382                    /* if negative, bitrate equals the target (in kbytes) */
383                    rc->target = ((uint64_t)(-rc->param.bitrate)) * 1024;
384            } else if (rc->num_frames  < create->fbase/create->fincr) {
385                    /* Source sequence is less than 1s long, we do as if it was 1s long */
386                    rc->target = rc->param.bitrate / 8;
387            } else {
388                    /* Target filesize = bitrate/8 * numframes / framerate */
389                    rc->target =
390                            ((uint64_t)rc->param.bitrate * (uint64_t)rc->num_frames * \
391                             (uint64_t)create->fincr) / \
392                            ((uint64_t)create->fbase * 8);
393            }
394    
395            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Frame rate: %d/%d (%ffps)\n",
396                            create->fbase, create->fincr,
397                            (double)create->fbase/(double)create->fincr);
398            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Number of frames: %d\n", rc->num_frames);
399            if(rc->param.bitrate>=0)
400                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Target bitrate: %ld\n", rc->param.bitrate);
401            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Target filesize: %lld\n", rc->target);
402    
403            /* Compensate the average frame overhead caused by the container */
404            rc->target -= rc->num_frames*rc->param.container_frame_overhead;
405            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Container Frame overhead: %d\n", rc->param.container_frame_overhead);
406            if(rc->param.container_frame_overhead)
407                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- New target filesize after container compensation: %lld\n", rc->target);
408    
409  #if 0          /* When bitrate is not given it means it has been scaled by an external
410  static void print_stats(rc_2pass2_t * rc)           * application */
411  {          if (rc->param.bitrate) {
412      int i;                  /* Apply zone settings
413      DPRINTF(XVID_DEBUG_RC, "type quant length scaled_length\n");                   * - set rc->tot_quant which represents the total num of bytes spent in
414                     *   fixed quant zones
415                     * - set rc->tot_weighted which represents the total amount of bytes
416                     *   spent in normal or weighted zones in first pass (normal zones can
417                     *   be considered weight=1)
418                     * - set rc->tot_quant_invariant which represents the total num of bytes
419                     *   spent in fixed quant zones for headers */
420                    zone_process(rc, create);
421            } else {
422                    /* External scaling -- zones are ignored */
423          for (i = 0; i < rc->num_frames; i++) {          for (i = 0; i < rc->num_frames; i++) {
424          stat_t * s = &rc->stats[i];                          rc->stats[i].zone_mode = XVID_ZONE_WEIGHT;
425          DPRINTF(XVID_DEBUG_RC, "%d %d %d %d\n", s->type, s->quant, s->length, s->scaled_length);                          rc->stats[i].weight = 1.0;
426      }      }
427                    rc->tot_quant = 0;
428  }  }
 #endif  
429    
430  /* pre-process the statistics data          /* Gathers some information about first pass stats:
431      - for each type, count, tot_length, min_length, max_length           *  - finds the minimum frame length for each frame type during 1st pass.
432      - set keyframes_locations           *     rc->min_size[]
433             *  - determines the maximum frame length observed (no frame type distinction).
434             *     rc->max_size
435             *  - count how many times each frame type has been used.
436             *     rc->count[]
437             *  - total bytes used per frame type
438             *     rc->tot_length[]
439             *  - total bytes considered invariant between the 2 passes
440             *  - store keyframe location
441             *     rc->keyframe_locations[]
442  */  */
443            first_pass_stats_prepare_data(rc);
444    
445  static void          /* If we have a user bitrate, it means it's an internal curve scaling */
446  pre_process0(rc_2pass2_t * rc)          if (rc->param.bitrate) {
447  {                  /* Perform internal curve scaling */
448      int i,j;                  first_pass_scale_curve_internal(rc);
   
     for (i=0; i<3; i++) {  
         rc->count[i]=0;  
         rc->tot_length[i] = 0;  
         rc->last_quant[i] = 0;  
                 rc->min_length[i] = INT_MAX;  
449      }      }
450    
451          rc->max_length = INT_MIN;          /* Apply advanced curve options, and compute some parameters in order to
452             * shape the curve in the BEFORE/AFTER pair of functions */
453      for (i=j=0; i<rc->num_frames; i++) {          scaled_curve_apply_advanced_parameters(rc);
454          stat_t * s = &rc->stats[i];  
455            /* Check curve for VBV compliancy and rescale if necessary */
456    #ifdef VBV_FORCE
457            if (rc->param.vbv_size==0) {
458                    rc->param.vbv_size      =  3145728;
459                    rc->param.vbv_initial   =  2359296;
460                    rc->param.vbv_maxrate   =  4854000;
461                    rc->param.vbv_peakrate  =  8000000;
462            }
463    #endif
464    
465          rc->count[s->type-1]++;          /* vbv_size==0 switches VBV check off */
466          rc->tot_length[s->type-1] += s->length;          if (rc->param.vbv_size > 0)  {
467                    const double fps = (double)create->fbase/(double)create->fincr;
468                    int status = check_curve_for_vbv_compliancy(rc, fps);
469    
470          if (s->length < rc->min_length[s->type-1]) {                  if (status) {
471              rc->min_length[s->type-1] = s->length;                          DPRINTF(XVID_DEBUG_RC, "[xvid rc] Underflow detected - Scaling Curve for compliancy.\n");
472          }          }
473    
474          if (s->length > rc->max_length) {                  status = scale_curve_for_vbv_compliancy(rc, fps);
             rc->max_length = s->length;  
         }  
475    
476          if (s->type == XVID_TYPE_IVOP) {                  if (status == 0) {
477              rc->keyframe_locations[j] = i;                          DPRINTF(XVID_DEBUG_RC, "[xvid rc] VBV compliant curve scaling done.\n");
478              j++;                  } else {
479                            DPRINTF(XVID_DEBUG_RC, "[xvid rc] VBV compliant curve scaling impossible.\n");
480          }          }
481      }      }
482            *handle = rc;
483          /*          return(0);
          * The "per sequence" overflow system considers a natural sequence to be  
          * formed by all frames between two iframes, so if we want to make sure  
          * the system does not go nuts during last sequence, we force the last  
          * frame to appear in the keyframe locations array.  
          */  
     rc->keyframe_locations[j] = i;  
   
         DPRINTF(XVID_DEBUG_RC, "Min 1st pass IFrame length: %d\n", rc->min_length[0]);  
         DPRINTF(XVID_DEBUG_RC, "Min 1st pass PFrame length: %d\n", rc->min_length[1]);  
         DPRINTF(XVID_DEBUG_RC, "Min 1st pass BFrame length: %d\n", rc->min_length[2]);  
484  }  }
485    
486    /*----------------------------------------------------------------------------
487     *--------------------------------------------------------------------------*/
488    
489  /* calculate zone weight "center" */  static int
490    rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy)
 static void  
 zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)  
491  {  {
492      int i,j;          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- target_total:%lld desired_total:%.2f (%.2f%%) actual_total:%.2f (%.2f%%)\n",
493      int n = 0;                          rc->target,
494                            rc->desired_total,
495      rc->avg_weight = 0.0;                          100*rc->desired_total/(double)rc->target,
496      rc->tot_quant = 0;                          rc->real_total,
497                            100*rc->real_total/(double)rc->target);
498    
499            free(rc->keyframe_locations);
500      if (create->num_zones == 0) {          free(rc->stats);
501          for (j = 0; j < rc->num_frames; j++) {          free(rc);
502              rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;          return(0);
             rc->stats[j].weight = 1.0;  
         }  
         rc->avg_weight += rc->num_frames * 1.0;  
         n += rc->num_frames;  
503      }      }
504    
505    /*----------------------------------------------------------------------------
506     *--------------------------------------------------------------------------*/
507    
508      for(i=0; i < create->num_zones; i++) {  static int
509    rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)
510    {
511            twopass_stat_t * s = &rc->stats[data->frame_num];
512            double dbytes;
513            double scaled_quant;
514            double overflow;
515            int capped_to_max_framesize = 0;
516    
517          int next = (i+1<create->num_zones) ? create->zones[i+1].frame : rc->num_frames;          /* This function is quite long but easy to understand. In order to simplify
518             * the code path (a bit), we treat 3 cases that can return immediatly. */
519    
520          if (i==0 && create->zones[i].frame > 0) {          /* First case: Another plugin has already set a quantizer */
521              for (j = 0; j < create->zones[i].frame && j < rc->num_frames; j++) {          if (data->quant > 0)
522                  rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;                  return(0);
                 rc->stats[j].weight = 1.0;  
             }  
             rc->avg_weight += create->zones[i].frame * 1.0;  
             n += create->zones[i].frame;  
         }  
523    
524          if (create->zones[i].mode == XVID_ZONE_WEIGHT) {          /* Second case: insufficent stats data
525              for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {           * We can't guess much what we should do, let core decide all alone */
526                  rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;          if (data->frame_num >= rc->num_frames) {
527                  rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;                  DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- stats file too short (now processing frame %d)",
528              }                          data->frame_num);
529              next -= create->zones[i].frame;                  return(0);
             rc->avg_weight += (double)(next * create->zones[i].increment) / (double)create->zones[i].base;  
             n += next;  
         }else{  // XVID_ZONE_QUANT  
             for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {  
                 rc->stats[j].zone_mode = XVID_ZONE_QUANT;  
                 rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;  
                 rc->tot_quant += rc->stats[j].length;  
             }  
         }  
530      }      }
     rc->avg_weight = n>0 ? rc->avg_weight/n : 1.0;  
531    
532      DPRINTF(XVID_DEBUG_RC, "center_weight: %f (for %i frames);   fixed_bytes: %i\n", rc->avg_weight, n, rc->tot_quant);          /* Third case: We are in a Quant zone
533  }           * Quant zones must just ensure we use the same settings as first pass
534             * So set the quantizer and the type */
535            if (s->zone_mode == XVID_ZONE_QUANT) {
536                    /* Quant stuff */
537                    rc->fq_error += s->weight;
538                    data->quant = (int)rc->fq_error;
539                    rc->fq_error -= data->quant;
540    
541                    /* The type stuff */
542                    data->type = s->type;
543    
544  /* scale the curve */                  /* The only required data for AFTER step is this one for the overflow
545                     * control */
546                    s->desired_length = s->length;
547    
548  static void                  return(0);
549  internal_scale(rc_2pass2_t *rc)          }
 {  
         int64_t target  = rc->target - rc->tot_quant;  
         int64_t pass1_length = rc->tot_length[0] + rc->tot_length[1] + rc->tot_length[2] - rc->tot_quant;  
         int min_size[3];  
         double scaler;  
         int i;  
550    
551    
552          /*          /*************************************************************************/
553           * Perform an initial scale pass.          /*************************************************************************/
554           * if a frame size is scaled underneath our hardcoded minimums, then we          /*************************************************************************/
          * force the frame size to the minimum, and deduct the original & scaled  
          * frame length from the original and target total lengths  
          */  
555    
556          min_size[0] = ((rc->stats[0].blks[0]*22) + 240) / 8;          /*-------------------------------------------------------------------------
557          min_size[1] = (rc->stats[0].blks[0] + 88) / 8;           * Frame bit allocation first part
558          min_size[2] = 8;           *
559             * First steps apply user settings, just like it is done in the theoritical
560          scaler = (double)target / (double)pass1_length;           * scaled_curve_apply_advanced_parameters
561             *-----------------------------------------------------------------------*/
         if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {  
                 DPRINTF(XVID_DEBUG_RC, "undersize warning\n");  
         scaler = 1.0;  
         }  
562    
563      DPRINTF(XVID_DEBUG_RC,          /* Set desired to what we are wanting to obtain for this frame */
564                          "Before any correction: target=%i, tot_length=%i, scaler=%f\n",          dbytes = (double)s->scaled_length;
                         (int)target, (int)pass1_length, scaler);  
565    
566          for (i=0; i<rc->num_frames; i++) {          /* IFrame user settings*/
567                  stat_t * s = &rc->stats[i];          if (s->type == XVID_TYPE_IVOP) {
568                  int len;                  /* Keyframe boosting -- All keyframes benefit from it */
569                    dbytes += dbytes*rc->param.keyframe_boost / 100;
570    
571          if (s->zone_mode == XVID_ZONE_QUANT) {  #if 0 /* ToDo: decide how to apply kfthresholding */
572              s->scaled_length = s->length;  #endif
         }else {  
                     len = (int)((double)s->length * scaler * s->weight / rc->avg_weight);  
                     if (len < min_size[s->type-1]) {            /* force frame size */  
                             s->scaled_length = min_size[s->type-1];  
                             target -= s->scaled_length;  
                             pass1_length -= s->length;  
573                      }else{                      }else{
                             s->scaled_length = 0;  
                     }  
         }  
         }  
   
     scaler = (double)target / (double)pass1_length;  
     if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {  
                 DPRINTF(XVID_DEBUG_RC,"undersize warning\n");  
                 scaler = 1.0;  
         }  
   
         DPRINTF(XVID_DEBUG_RC,  
                         "After correction: target=%i, tot_length=%i, scaler=%f\n",  
                         (int)target, (int)pass1_length, scaler);  
574    
575          for (i=0; i<rc->num_frames; i++) {                  /* P/S/B frames must reserve some bits for iframe boosting */
576                  stat_t * s = &rc->stats[i];                  dbytes *= rc->pb_iboost_tax_ratio;
577    
578                  if (s->scaled_length==0) {      /* ignore frame with forced frame sizes */                  /* Apply assymetric curve compression */
579                          s->scaled_length = (int)((double)s->length * scaler * s->weight / rc->avg_weight);                  if (rc->param.curve_compression_high || rc->param.curve_compression_low) {
580                            double assymetric_delta;
581    
582                            /* Compute the assymetric delta, this is computed before applying
583                             * the tax, as done in the pre_process function */
584                            if (dbytes > rc->avg_length[s->type-1])
585                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_high / 100.0;
586                            else
587                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_low  / 100.0;
588    
589                            /* Now we must apply the assymetric tax, else our curve compression
590                             * would not give a theoritical target size equal to what it is
591                             * expected */
592                            dbytes *= rc->assymetric_tax_ratio;
593    
594                            /* Now we can add the assymetric delta */
595                            dbytes += assymetric_delta;
596                  }                  }
597          }          }
 }  
   
   
   
598    
599  static void          /* That is what we would like to have -- Don't put that chunk after
600  pre_process1(rc_2pass2_t * rc)           * overflow control, otherwise, overflow is counted twice and you obtain
601  {           * half sized bitrate sequences */
602      int i;          s->desired_length  = (int)dbytes;
603      double total1, total2;          rc->desired_total += dbytes;
     uint64_t ivop_boost_total;  
604    
605      ivop_boost_total = 0;          /*------------------------------------------------------------------------
606      rc->curve_comp_error = 0;           * Frame bit allocation: overflow control part.
607             *
608             * Unlike the theoritical scaled_curve_apply_advanced_parameters, here
609             * it's real encoding and we need to make sure we don't go so far from
610             * what is our ideal scaled curve.
611             *-----------------------------------------------------------------------*/
612    
613            /* Compute the overflow we should compensate */
614            if (s->type != XVID_TYPE_IVOP || rc->overflow > 0) {
615                    double frametype_factor;
616                    double framesize_factor;
617    
618      for (i=0; i<3; i++) {                  /* Take only the desired part of overflow */
619          rc->tot_scaled_length[i] = 0;                  overflow = rc->overflow;
     }  
620    
621      for (i=0; i<rc->num_frames; i++) {                  /* Factor that will take care to decrease the overflow applied
622          stat_t * s = &rc->stats[i];                   * according to the importance of this frame type in term of
623                     * overall size */
624                    frametype_factor  = rc->count[XVID_TYPE_IVOP-1]*rc->avg_length[XVID_TYPE_IVOP-1];
625                    frametype_factor += rc->count[XVID_TYPE_PVOP-1]*rc->avg_length[XVID_TYPE_PVOP-1];
626                    frametype_factor += rc->count[XVID_TYPE_BVOP-1]*rc->avg_length[XVID_TYPE_BVOP-1];
627                    frametype_factor /= rc->count[s->type-1]*rc->avg_length[s->type-1];
628                    frametype_factor  = 1/frametype_factor;
629    
630                    /* Factor that will take care not to compensate too much for this frame
631                     * size */
632                    framesize_factor  = dbytes;
633                    framesize_factor /= rc->avg_length[s->type-1];
634    
635          rc->tot_scaled_length[s->type-1] += s->scaled_length;                  /* Treat only the overflow part concerned by this frame type and size */
636                    overflow *= frametype_factor;
637    #if 0
638                    /* Leave this one alone, as it impacts badly on quality */
639                    overflow *= framesize_factor;
640    #endif
641    
642          if (s->type == XVID_TYPE_IVOP) {                  /* Apply the overflow strength imposed by the user */
643              ivop_boost_total += s->scaled_length * rc->param.keyframe_boost / 100;                  overflow *= (rc->param.overflow_control_strength/100.0f);
644          }          } else {
645                    /* no negative overflow applied in IFrames because:
646                     *  - their role is important as they're references for P/BFrames.
647                     *  - there aren't much in typical sequences, so if an IFrame overflows too
648                     *    much, this overflow may impact the next IFrame too much and generate
649                     *    a sequence of poor quality frames */
650                    overflow = 0;
651      }      }
652    
653      rc->movie_curve = ((double)(rc->tot_scaled_length[XVID_TYPE_PVOP-1] + rc->tot_scaled_length[XVID_TYPE_BVOP-1] + ivop_boost_total) /          /* Make sure we are not trying to compensate more overflow than we even have */
654                                          (rc->tot_scaled_length[XVID_TYPE_PVOP-1] + rc->tot_scaled_length[XVID_TYPE_BVOP-1]));          if (fabs(overflow) > fabs(rc->overflow))
655                    overflow = rc->overflow;
656    
657      for(i=0; i<3; i++) {          /* Make sure the overflow doesn't make the frame size to get out of the range
658          if (rc->count[i] == 0 || rc->movie_curve == 0) {           * [-max_degradation..+max_improvment] */
659              rc->avg_length[i] = 1;          if (overflow > dbytes*rc->param.max_overflow_improvement / 100) {
660                    if(overflow <= dbytes)
661                            dbytes += dbytes * rc->param.max_overflow_improvement / 100;
662                    else
663                            dbytes += overflow * rc->param.max_overflow_improvement / 100;
664            } else if (overflow < - dbytes * rc->param.max_overflow_degradation / 100) {
665                    dbytes -= dbytes * rc->param.max_overflow_degradation / 100;
666          }else{          }else{
667              rc->avg_length[i] = rc->tot_scaled_length[i] / rc->count[i] / rc->movie_curve;                  dbytes += overflow;
668          }          }
669    
670            /*-------------------------------------------------------------------------
671             * Frame bit allocation last part:
672             *
673             * Cap frame length so we don't reach neither bigger frame sizes than first
674             * pass nor smaller than the allowed minimum.
675             *-----------------------------------------------------------------------*/
676    
677    #ifdef PASS_SMALLER
678            if (dbytes > s->length) {
679                    dbytes = s->length;
680      }      }
681    #endif
682    
683      /* alt curve stuff here */          /* Prevent stupid desired sizes under logical values */
684            if (dbytes < rc->min_length[s->type-1]) {
685                    dbytes = rc->min_length[s->type-1];
686            }
687    
688      if (rc->param.use_alt_curve) {          /*------------------------------------------------------------------------
689          const double avg_pvop = rc->avg_length[XVID_TYPE_PVOP-1];           * Desired frame length <-> quantizer mapping
690          const uint64_t tot_pvop = rc->tot_length[XVID_TYPE_PVOP-1];           *-----------------------------------------------------------------------*/
         const uint64_t tot_bvop = rc->tot_length[XVID_TYPE_BVOP-1];  
         const uint64_t tot_scaled_pvop = rc->tot_scaled_length[XVID_TYPE_PVOP-1];  
         const uint64_t tot_scaled_bvop = rc->tot_scaled_length[XVID_TYPE_BVOP-1];  
691    
692                  rc->alt_curve_low = avg_pvop - avg_pvop * (double)rc->param.alt_curve_low_dist / 100.0;  #ifdef BQUANT_PRESCALE
693                  rc->alt_curve_low_diff = avg_pvop - rc->alt_curve_low;          /* For bframes we prescale the quantizer to avoid too high quant scaling */
694                  rc->alt_curve_high = avg_pvop + avg_pvop * (double)rc->param.alt_curve_high_dist / 100.0;          if(s->type == XVID_TYPE_BVOP) {
                 rc->alt_curve_high_diff = rc->alt_curve_high - avg_pvop;  
695    
696          if (rc->param.alt_curve_use_auto) {                  twopass_stat_t *b_ref = s;
             if (tot_bvop + tot_pvop > tot_scaled_bvop + tot_scaled_pvop) {  
                                 rc->param.alt_curve_min_rel_qual = (int)(100.0 - (100.0 - 100.0 /  
                                         ((double)(tot_pvop + tot_bvop) / (double)(tot_scaled_pvop + tot_scaled_bvop))) * (double)rc->param.alt_curve_auto_str / 100.0);  
697    
698                                  if (rc->param.alt_curve_min_rel_qual < 20)                  /* Find the reference frame */
699                                          rc->param.alt_curve_min_rel_qual = 20;                  while(b_ref != &rc->stats[0] && b_ref->type == XVID_TYPE_BVOP)
700              }else{                          b_ref--;
701                                  rc->param.alt_curve_min_rel_qual = 100;  
702              }                  /* Compute the original quant */
703                    s->quant  = 2*(100*s->quant - data->bquant_offset);
704                    s->quant += data->bquant_ratio - 1; /* to avoid rounding issues */
705                    s->quant  = s->quant/data->bquant_ratio - b_ref->quant;
706          }          }
707                  rc->alt_curve_mid_qual = (1.0 + (double)rc->param.alt_curve_min_rel_qual / 100.0) / 2.0;  #endif
                 rc->alt_curve_qual_dev = 1.0 - rc->alt_curve_mid_qual;  
708    
709          if (rc->param.alt_curve_low_dist > 100) {          /* Don't laugh at this very 'simple' quant<->size relationship, it
710                          switch(rc->param.alt_curve_type) {           * proves to be acurate enough for our algorithm */
711              case XVID_CURVE_SINE: // Sine Curve (high aggressiveness)          scaled_quant = (double)s->quant*(double)s->length/(double)dbytes;
712                                  rc->alt_curve_qual_dev *= 2.0 / (1.0 + sin(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff)));  
713                                  rc->alt_curve_mid_qual = 1.0 - rc->alt_curve_qual_dev * sin(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff));  #ifdef COMPENSATE_FORMULA
714                                  break;          /* We know xvidcore will apply the bframe formula again, so we compensate
715                          case XVID_CURVE_LINEAR: // Linear (medium aggressiveness)           * it right now to make sure we would not apply it twice */
716                                  rc->alt_curve_qual_dev *= 2.0 / (1.0 + avg_pvop / rc->alt_curve_low_diff);          if(s->type == XVID_TYPE_BVOP) {
                                 rc->alt_curve_mid_qual = 1.0 - rc->alt_curve_qual_dev * avg_pvop / rc->alt_curve_low_diff;  
                                 break;  
                         case XVID_CURVE_COSINE: // Cosine Curve (low aggressiveness)  
                                 rc->alt_curve_qual_dev *= 2.0 / (1.0 + (1.0 - cos(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff))));  
                                 rc->alt_curve_mid_qual = 1.0 - rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff)));  
                         }  
                 }  
     }  
     /* --- */  
717    
718                    twopass_stat_t *b_ref = s;
719    
720      total1=total2=0;                  /* Find the reference frame */
721      for (i=0; i<rc->num_frames; i++) {                  while(b_ref != &rc->stats[0] && b_ref->type == XVID_TYPE_BVOP)
722          stat_t * s = &rc->stats[i];                          b_ref--;
723    
724                    /* Compute the quant it would be if the core did not apply the bframe
725                     * formula */
726                    scaled_quant  = 100*scaled_quant - data->bquant_offset;
727                    scaled_quant += data->bquant_ratio - 1; /* to avoid rouding issues */
728                    scaled_quant /= data->bquant_ratio;
729            }
730    #endif
731    
732          if (s->type != XVID_TYPE_IVOP) {          /* Quantizer has been scaled using floating point operations/results, we
733              double dbytes,dbytes2;           * must cast it to integer */
734            data->quant = (int)scaled_quant;
735    
736              dbytes = s->scaled_length / rc->movie_curve;          /* Let's clip the computed quantizer, if needed */
737              dbytes2 = 0; /* XXX: warning */          if (data->quant < 1) {
738              total1 += dbytes;                  data->quant = 1;
739              if (s->type == XVID_TYPE_BVOP)          } else if (data->quant > 31) {
740                  dbytes *= rc->avg_length[XVID_TYPE_PVOP-1] / rc->avg_length[XVID_TYPE_BVOP-1];                  data->quant = 31;
741            } else {
742    
743              if (rc->param.use_alt_curve) {                  /* The frame quantizer has not been clipped, this appears to be a good
744                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                   * computed quantizer, do not loose quantizer decimal part that we
745                     * accumulate for later reuse when its sum represents a complete
746                     * unit. */
747                    rc->quant_error[s->type-1][data->quant] += scaled_quant - (double)data->quant;
748    
749                      if (dbytes >= rc->alt_curve_high) {                  if (rc->quant_error[s->type-1][data->quant] >= 1.0) {
750                                                  dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev);                          rc->quant_error[s->type-1][data->quant] -= 1.0;
751                      }else{                          data->quant++;
752                                                  switch(rc->param.alt_curve_type) {                  } else if (rc->quant_error[s->type-1][data->quant] <= -1.0) {
753                          case XVID_CURVE_SINE :                          rc->quant_error[s->type-1][data->quant] += 1.0;
754                                                      dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * sin(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_high_diff)));                          data->quant--;
                                                         break;  
                         case XVID_CURVE_LINEAR :  
                                                     dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) / rc->alt_curve_high_diff);  
                                                         break;  
                                                 case XVID_CURVE_COSINE :  
                                                     dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_high_diff))));  
                                                 }  
                                         }  
                 }else{  
                     if (dbytes <= rc->alt_curve_low) {  
                                                 dbytes2 = dbytes;  
                     }else{  
                                                 switch(rc->param.alt_curve_type) {  
                                                 case XVID_CURVE_SINE :  
                                                     dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * sin(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_low_diff)));  
                                                         break;  
                                                 case XVID_CURVE_LINEAR :  
                                                     dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) / rc->alt_curve_low_diff);  
                                                         break;  
                                                 case XVID_CURVE_COSINE :  
                                                     dbytes2 = dbytes * (rc->alt_curve_mid_qual + rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_low_diff))));  
755                                                  }                                                  }
756                                          }                                          }
757    
758            /* Now we have a computed quant that is in the right quante range, with a
759             * possible +1 correction due to cumulated error. We can now safely clip
760             * the quantizer again with user's quant ranges. "Safely" means the Rate
761             * Control could learn more about this quantizer, this knowledge is useful
762             * for future frames even if it this quantizer won't be really used atm,
763             * that's why we don't perform this clipping earlier. */
764            if (data->quant < data->min_quant[s->type-1]) {
765                    data->quant = data->min_quant[s->type-1];
766            } else if (data->quant > data->max_quant[s->type-1]) {
767                    data->quant = data->max_quant[s->type-1];
768                  }                  }
769    
770            if (data->quant < rc->min_quant) data->quant = rc->min_quant;
771    
772              }else{          /* To avoid big quality jumps from frame to frame, we apply a "security"
773                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {           * rule that makes |last_quant - new_quant| <= 2. This rule only applies
774                      dbytes2=((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_high / 100.0);           * to predicted frames (P and B) */
775                  }else{          if (s->type != XVID_TYPE_IVOP && rc->last_quant[s->type-1] && capped_to_max_framesize == 0) {
                                 dbytes2 = ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_low / 100.0);  
                 }  
             }  
776    
777              if (s->type == XVID_TYPE_BVOP) {                  if (data->quant > rc->last_quant[s->type-1] + 2) {
778                              dbytes2 *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];                          data->quant = rc->last_quant[s->type-1] + 2;
779                              if (dbytes2 < rc->min_length[XVID_TYPE_BVOP-1])                          DPRINTF(XVID_DEBUG_RC,
780                                      dbytes2 = rc->min_length[XVID_TYPE_BVOP-1];                                          "[xvid rc] -- frame %d p/b-frame quantizer prevented from rising too steeply\n",
781              }else{                                          data->frame_num);
                             if (dbytes2 < rc->min_length[XVID_TYPE_PVOP-1])  
                                     dbytes2 = rc->min_length[XVID_TYPE_PVOP-1];  
782              }              }
783              total2 += dbytes2;                  if (data->quant < rc->last_quant[s->type-1] - 2) {
784                            data->quant = rc->last_quant[s->type-1] - 2;
785                            DPRINTF(XVID_DEBUG_RC,
786                                            "[xvid rc] -- frame:%d p/b-frame quantizer prevented from falling too steeply\n",
787                                            data->frame_num);
788          }          }
789      }      }
790    
791      rc->curve_comp_scale = total1 / total2;          /* We don't want to pollute the RC histerisis when our computed quant has
792             * been computed from a capped frame size */
793            if (capped_to_max_framesize == 0)
794                    rc->last_quant[s->type-1] = data->quant;
795    
796      if (!rc->param.use_alt_curve) {          /* Don't forget to force 1st pass frame type ;-) */
797          DPRINTF(XVID_DEBUG_RC, "middle frame size for asymmetric curve compression: %i\n",          data->type = s->type;
798              (int)(rc->avg_length[XVID_TYPE_PVOP-1] * rc->curve_comp_scale));  
799            return 0;
800      }      }
801    
802      if (rc->param.use_alt_curve) {  /*----------------------------------------------------------------------------
803          int bonus_bias = rc->param.alt_curve_bonus_bias;   *--------------------------------------------------------------------------*/
804          int oldquant = 1;  
805    static int
806    rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)
807    {
808            const char frame_type[4] = { 'i', 'p', 'b', 's'};
809            twopass_stat_t * s = &rc->stats[data->frame_num];
810    
811              if (rc->param.alt_curve_use_auto_bonus_bias)          /* Insufficent stats data */
812                      bonus_bias = rc->param.alt_curve_min_rel_qual;          if (data->frame_num >= rc->num_frames)
813                    return 0;
814    
815              rc->alt_curve_curve_bias_bonus = (total1 - total2) * (double)bonus_bias / 100.0 / (double)(rc->num_frames /* - credits_frames */ - rc->num_keyframes);          /* Update the quantizer counter */
816              rc->curve_comp_scale = ((total1 - total2) * (1.0 - (double)bonus_bias / 100.0) + total2) / total2;          rc->quant_count[s->type-1][data->quant]++;
817    
818            /* Update the frame type overflow */
819            if (data->type == XVID_TYPE_IVOP) {
820                    int kfdiff = 0;
821    
822          /* special info for alt curve:  bias bonus and quantizer thresholds */                  if(rc->KF_idx != rc->num_frames -1) {
823                            kfdiff  = rc->keyframe_locations[rc->KF_idx+1];
824                            kfdiff -= rc->keyframe_locations[rc->KF_idx];
825                    }
826    
827                  DPRINTF(XVID_DEBUG_RC, "avg scaled framesize:%i\n", (int)rc->avg_length[XVID_TYPE_PVOP-1]);                  /* Flush Keyframe overflow accumulator */
828                  DPRINTF(XVID_DEBUG_RC, "bias bonus:%i bytes\n", (int)rc->alt_curve_curve_bias_bonus);                  rc->overflow += rc->KFoverflow;
829    
830                  for (i=1; i <= (int)(rc->alt_curve_high*2)+1; i++) {                  /* Store the frame overflow to the keyframe accumulator */
831              double curve_temp, dbytes;                  rc->KFoverflow = s->desired_length - data->length;
             int newquant;  
832    
833              dbytes = i;                  if (kfdiff > 1) {
834                          if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                          /* Non-consecutive keyframes case:
835                  if (dbytes >= rc->alt_curve_high) {                           * We can then divide this total keyframe overflow into equal parts
836                                          curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev);                           * that we will distribute into regular overflow at each frame
837                             * between the sequence bounded by two IFrames */
838                            rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);
839                  }else{                  }else{
840                                          switch(rc->param.alt_curve_type)                          /* Consecutive keyframes case:
841                                          {                           * Flush immediatly the keyframe overflow and reset keyframe
842                                          case XVID_CURVE_SINE :                           * overflow */
843                                                  curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * sin(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_high_diff)));                          rc->overflow += rc->KFoverflow;
844                                                  break;                          rc->KFoverflow = 0;
845                                          case XVID_CURVE_LINEAR :                          rc->KFoverflow_partial = 0;
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) / rc->alt_curve_high_diff);  
                                                 break;  
                                         case XVID_CURVE_COSINE :  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_high_diff))));  
                                         }  
846                                  }                                  }
847                    rc->KF_idx++;
848                          }else{                          }else{
849                  if (dbytes <= rc->alt_curve_low) {                  /* Accumulate the frame overflow */
850                                          curve_temp = dbytes;                  rc->overflow += s->desired_length - data->length;
851                  }else{  
852                                          switch(rc->param.alt_curve_type)                  /* Distribute part of the keyframe overflow */
853                                          {                  rc->overflow += rc->KFoverflow_partial;
854                                          case XVID_CURVE_SINE :  
855                                                  curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * sin(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_low_diff)));                  /* Don't forget to substract that same amount from the total keyframe
856                                                  break;                   * overflow */
857                                          case XVID_CURVE_LINEAR :                  rc->KFoverflow -= rc->KFoverflow_partial;
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) / rc->alt_curve_low_diff);  
                                                 break;  
                                         case XVID_CURVE_COSINE :  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual + rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_low_diff))));  
                                         }  
858                                  }                                  }
859    
860            s->error = s->desired_length - data->length;
861            rc->real_total += data->length;
862    
863            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- frame:%d type:%c quant:%d stats:%d scaled:%d desired:%d actual:%d error:%d overflow:%.2f\n",
864                            data->frame_num,
865                            frame_type[data->type-1],
866                            data->quant,
867                            s->length,
868                            s->scaled_length,
869                            s->desired_length,
870                            s->desired_length - s->error,
871                            -s->error,
872                            rc->overflow);
873    
874            return(0);
875                          }                          }
876    
877                          if (rc->movie_curve > 1.0)  /*****************************************************************************
878                                  dbytes *= rc->movie_curve;   * Helper functions definition
879     ****************************************************************************/
880    
881    /* Default buffer size for reading lines */
882    #define BUF_SZ   1024
883    
884                          newquant = (int)(dbytes * 2.0 / (curve_temp * rc->curve_comp_scale + rc->alt_curve_curve_bias_bonus));  /* Helper functions for reading/parsing the stats file */
885                          if (newquant > 1) {  static char *skipspaces(char *string);
886                                  if (newquant != oldquant) {  static int iscomment(char *string);
887                      int percent = (int)((i - rc->avg_length[XVID_TYPE_PVOP-1]) * 100.0 / rc->avg_length[XVID_TYPE_PVOP-1]);  static char *readline(FILE *f);
888                                          oldquant = newquant;  
889                                          DPRINTF(XVID_DEBUG_RC, "quant:%i threshold at %i : %i percent\n", newquant, i, percent);  /* This function counts the number of frame entries in the stats file
890     * It also counts the number of I Frames */
891    static int
892    statsfile_count_frames(rc_2pass2_t * rc, char * filename)
893    {
894            FILE * f;
895            char *line;
896            int lines;
897    
898            rc->num_frames = 0;
899            rc->num_keyframes = 0;
900    
901            if ((f = fopen(filename, "rb")) == NULL)
902                    return(-1);
903    
904            lines = 0;
905            while ((line = readline(f)) != NULL) {
906    
907                    char *ptr;
908                    char type;
909                    int fields;
910    
911                    lines++;
912    
913                    /* We skip spaces */
914                    ptr = skipspaces(line);
915    
916                    /* Skip coment lines or empty lines */
917                    if(iscomment(ptr) || *ptr == '\0') {
918                            free(line);
919                            continue;
920                                  }                                  }
921    
922                    /* Read the stat line from buffer */
923                    fields = sscanf(ptr, "%c", &type);
924    
925                    /* Valid stats files have at least 7 fields */
926                    if (fields == 1) {
927                            switch(type) {
928                            case 'i':
929                            case 'I':
930                                    rc->num_keyframes++;
931                            case 'p':
932                            case 'P':
933                            case 'b':
934                            case 'B':
935                            case 's':
936                            case 'S':
937                                    rc->num_frames++;
938                                    break;
939                            default:
940                                    DPRINTF(XVID_DEBUG_RC,
941                                                    "[xvid rc] -- WARNING: L%d unknown frame type used (%c).\n",
942                                                    lines, type);
943                          }                          }
944                    } else {
945                                    DPRINTF(XVID_DEBUG_RC,
946                                                    "[xvid rc] -- WARNING: L%d misses some stat fields (%d).\n",
947                                                    lines, 7-fields);
948                  }                  }
949    
950                    /* Free the line buffer */
951                    free(line);
952      }      }
953    
954      rc->overflow = 0;          /* We are done with the file */
955      rc->KFoverflow = 0;          fclose(f);
956      rc->KFoverflow_partial = 0;  
957      rc->KF_idx = 1;          return(0);
958  }  }
959    
960    /* open stats file(s) and read into rc->stats array */
961    static int
962    statsfile_load(rc_2pass2_t *rc, char * filename)
963    {
964            FILE * f;
965            int processed_entries;
966    
967            /* Opens the file */
968            if ((f = fopen(filename, "rb"))==NULL)
969                    return(-1);
970    
971            processed_entries = 0;
972            while(processed_entries < rc->num_frames) {
973                    char type;
974                    int fields;
975                    twopass_stat_t * s = &rc->stats[processed_entries];
976                    char *line, *ptr;
977    
978  static int rc_2pass2_create(xvid_plg_create_t * create, rc_2pass2_t ** handle)                  /* Read the line from the file */
979  {                  if((line = readline(f)) == NULL)
980      xvid_plugin_2pass2_t * param = (xvid_plugin_2pass2_t *)create->param;                          break;
     rc_2pass2_t * rc;  
     int i;  
981    
982      rc = malloc(sizeof(rc_2pass2_t));                  /* We skip spaces */
983      if (rc == NULL)                  ptr = skipspaces(line);
         return XVID_ERR_MEMORY;  
984    
985      rc->param = *param;                  /* Skip comment lines or empty lines */
986                    if(iscomment(ptr) || *ptr == '\0') {
987                            free(line);
988                            continue;
989                    }
990    
991      if (rc->param.keyframe_boost <= 0) rc->param.keyframe_boost = 0;                  /* Reset this field that is optional */
992      if (rc->param.payback_method <= 0) rc->param.payback_method = XVID_PAYBACK_PROP;                  s->scaled_length = 0;
     if (rc->param.bitrate_payback_delay <= 0) rc->param.bitrate_payback_delay = 250;  
     if (rc->param.curve_compression_high <= 0) rc->param.curve_compression_high = 0;  
     if (rc->param.curve_compression_low <= 0) rc->param.curve_compression_low = 0;  
     if (rc->param.max_overflow_improvement <= 0) rc->param.max_overflow_improvement = 60;  
     if (rc->param.max_overflow_degradation <= 0) rc->param.max_overflow_degradation = 60;  
   
     if (rc->param.use_alt_curve <= 0) rc->param.use_alt_curve = 0;  
     if (rc->param.alt_curve_high_dist <= 0) rc->param.alt_curve_high_dist = 500;  
     if (rc->param.alt_curve_low_dist <= 0) rc->param.alt_curve_low_dist = 90;  
     if (rc->param.alt_curve_use_auto <= 0) rc->param.alt_curve_use_auto = 1;  
     if (rc->param.alt_curve_auto_str <= 0) rc->param.alt_curve_auto_str = 30;  
     if (rc->param.alt_curve_type <= 0) rc->param.alt_curve_type = XVID_CURVE_LINEAR;  
     if (rc->param.alt_curve_min_rel_qual <= 0) rc->param.alt_curve_min_rel_qual = 50;  
     if (rc->param.alt_curve_use_auto_bonus_bias <= 0) rc->param.alt_curve_use_auto_bonus_bias = 1;  
     if (rc->param.alt_curve_bonus_bias <= 0) rc->param.alt_curve_bonus_bias = 50;  
   
     if (rc->param.kftreshold <= 0) rc->param.kftreshold = 10;  
     if (rc->param.kfreduction <= 0) rc->param.kfreduction = 20;  
     if (rc->param.min_key_interval <= 0) rc->param.min_key_interval = 300;  
993    
994      if (!det_stats_length(rc, param->filename)){                  /* Convert the fields */
995          DPRINTF(XVID_DEBUG_RC,"fopen %s failed\n", param->filename);                  fields = sscanf(ptr,
996          free(rc);                                                  "%c %d %d %d %d %d %d %d\n",
997          return XVID_ERR_FAIL;                                                  &type,
998                                                    &s->quant,
999                                                    &s->blks[0], &s->blks[1], &s->blks[2],
1000                                                    &s->length, &s->invariant /* not really yet */,
1001                                                    &s->scaled_length);
1002    
1003                    /* Free line buffer, we don't need it anymore */
1004                    free(line);
1005    
1006                    /* Fail silently, this has probably been warned in
1007                     * statsfile_count_frames */
1008                    if(fields != 7 && fields != 8)
1009                            continue;
1010    
1011                    /* Convert frame type and compute the invariant length part */
1012                    switch(type) {
1013                    case 'i':
1014                    case 'I':
1015                            s->type = XVID_TYPE_IVOP;
1016                            s->invariant /= INVARIANT_HEADER_PART_IVOP;
1017                            break;
1018                    case 'p':
1019                    case 'P':
1020                    case 's':
1021                    case 'S':
1022                            s->type = XVID_TYPE_PVOP;
1023                            s->invariant /= INVARIANT_HEADER_PART_PVOP;
1024                            break;
1025                    case 'b':
1026                    case 'B':
1027                            s->type = XVID_TYPE_BVOP;
1028                            s->invariant /= INVARIANT_HEADER_PART_BVOP;
1029                            break;
1030                    default:
1031                            /* Same as before, fail silently */
1032                            continue;
1033      }      }
1034    
1035      if ((rc->stats = malloc(rc->num_frames * sizeof(stat_t))) == NULL) {                  /* Ok it seems it's been processed correctly */
1036          free(rc);                  processed_entries++;
         return XVID_ERR_MEMORY;  
1037      }      }
1038    
1039      /*          /* Close the file */
1040           * We need an extra location because we do as if the last frame were an          fclose(f);
          * IFrame. This is needed because our code consider that frames between  
          * 2 IFrames form a natural sequence. So we store last frame as a  
          * keyframe location.  
          */  
     if ((rc->keyframe_locations = malloc((rc->num_keyframes + 1) * sizeof(int))) == NULL) {  
         free(rc->stats);  
         free(rc);  
         return XVID_ERR_MEMORY;  
     }  
1041    
1042      if (!load_stats(rc, param->filename)) {          return(0);
         DPRINTF(XVID_DEBUG_RC,"fopen %s failed\n", param->filename);  
         free(rc->keyframe_locations);  
         free(rc->stats);  
         free(rc);  
         return XVID_ERR_FAIL;  
1043      }      }
1044    
1045      /* pre-process our stats */  /* pre-process the statistics data
1046     * - for each type, count, tot_length, min_length, max_length
1047     * - set keyframes_locations, tot_prescaled */
1048    static void
1049    first_pass_stats_prepare_data(rc_2pass2_t * rc)
1050    {
1051            int i,j;
1052    
1053          if (rc->num_frames  < create->fbase/create->fincr) {          /* *rc fields initialization
1054                  rc->target = rc->param.bitrate / 8;     /* one second */           * NB: INT_MAX and INT_MIN are used in order to be immediately replaced
1055          }else{           *     with real values of the 1pass */
1056                  rc->target =          for (i=0; i<3; i++) {
1057                          ((uint64_t)rc->param.bitrate * (uint64_t)rc->num_frames * (uint64_t)create->fincr) / \                  rc->count[i]=0;
1058                          ((uint64_t)create->fbase * 8);                  rc->tot_length[i] = 0;
1059                    rc->tot_invariant[i] = 0;
1060                    rc->min_length[i] = INT_MAX;
1061          }          }
1062    
1063      DPRINTF(XVID_DEBUG_RC, "Number of frames: %d\n", rc->num_frames);          rc->max_length = INT_MIN;
1064          DPRINTF(XVID_DEBUG_RC, "Frame rate: %d/%d\n", create->fbase, create->fincr);          rc->tot_weighted = 0;
         DPRINTF(XVID_DEBUG_RC, "Target bitrate: %ld\n", rc->param.bitrate);  
         DPRINTF(XVID_DEBUG_RC, "Target filesize: %lld\n", rc->target);  
1065    
1066  #if 0          /* Loop through all frames and find/compute all the stuff this function
1067          rc->target -= rc->num_frames*24;        /* avi file header */           * is supposed to do */
1068  #endif          for (i=j=0; i<rc->num_frames; i++) {
1069                    twopass_stat_t * s = &rc->stats[i];
1070    
1071                    rc->count[s->type-1]++;
1072                    rc->tot_length[s->type-1] += s->length;
1073                    rc->tot_invariant[s->type-1] += s->invariant;
1074                    if (s->zone_mode != XVID_ZONE_QUANT)
1075                            rc->tot_weighted += (int)(s->weight*(s->length - s->invariant));
1076    
1077          pre_process0(rc);                  if (s->length < rc->min_length[s->type-1]) {
1078                            rc->min_length[s->type-1] = s->length;
1079                    }
1080    
1081          if (rc->param.bitrate) {                  if (s->length > rc->max_length) {
1082          zone_process(rc, create);                          rc->max_length = s->length;
                 internal_scale(rc);  
     }else{  
         /* external scaler: ignore zone */  
         for (i=0;i<rc->num_frames;i++) {  
             rc->stats[i].zone_mode = XVID_ZONE_WEIGHT;  
             rc->stats[i].weight = 1.0;  
1083          }          }
1084          rc->avg_weight = 1.0;  
1085          rc->tot_quant = 0;                  if (s->type == XVID_TYPE_IVOP) {
1086                            rc->keyframe_locations[j] = i;
1087                            j++;
1088      }      }
1089          pre_process1(rc);          }
1090    
1091            /* NB:
1092             * The "per sequence" overflow system considers a natural sequence to be
1093             * formed by all frames between two iframes, so if we want to make sure
1094             * the system does not go nuts during last sequence, we force the last
1095             * frame to appear in the keyframe locations array. */
1096            rc->keyframe_locations[j] = i;
1097    
1098      for (i=0; i<32;i++) {          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Min 1st pass IFrame length: %d\n", rc->min_length[0]);
1099          rc->pquant_error[i] = 0;          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Min 1st pass PFrame length: %d\n", rc->min_length[1]);
1100          rc->bquant_error[i] = 0;          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Min 1st pass BFrame length: %d\n", rc->min_length[2]);
         rc->quant_count[i] = 0;  
1101      }      }
1102    
1103      rc->fq_error = 0;  /* calculate zone weight "center" */
1104    static void
1105    zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)
1106    {
1107            int i,j;
1108            int n = 0;
1109    
1110      *handle = rc;          rc->tot_quant = 0;
1111          return(0);          rc->tot_quant_invariant = 0;
1112    
1113            if (create->num_zones == 0) {
1114                    for (j = 0; j < rc->num_frames; j++) {
1115                            rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1116                            rc->stats[j].weight = 1.0;
1117                    }
1118                    n += rc->num_frames;
1119  }  }
1120    
1121    
1122  static int rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy)          for(i=0; i < create->num_zones; i++) {
1123  {  
1124      free(rc->keyframe_locations);                  int next = (i+1<create->num_zones) ? create->zones[i+1].frame : rc->num_frames;
1125      free(rc->stats);  
1126          free(rc);                  /* Zero weight make no sense */
1127          return(0);                  if (create->zones[i].increment == 0) create->zones[i].increment = 1;
1128                    /* And obviously an undetermined infinite makes even less sense */
1129                    if (create->zones[i].base == 0) create->zones[i].base = 1;
1130    
1131                    if (i==0 && create->zones[i].frame > 0) {
1132                            for (j = 0; j < create->zones[i].frame && j < rc->num_frames; j++) {
1133                                    rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1134                                    rc->stats[j].weight = 1.0;
1135                            }
1136                            n += create->zones[i].frame;
1137  }  }
1138    
1139                    if (create->zones[i].mode == XVID_ZONE_WEIGHT) {
1140                            for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {
1141                                    rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1142                                    rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;
1143                            }
1144                            next -= create->zones[i].frame;
1145                            n += next;
1146                    } else{  /* XVID_ZONE_QUANT */
1147                            for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {
1148                                    rc->stats[j].zone_mode = XVID_ZONE_QUANT;
1149                                    rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;
1150                                    rc->tot_quant += rc->stats[j].length;
1151                                    rc->tot_quant_invariant += rc->stats[j].invariant;
1152                            }
1153                    }
1154            }
1155    }
1156    
1157    
1158  static int rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)  /* scale the curve */
1159    static void
1160    first_pass_scale_curve_internal(rc_2pass2_t *rc)
1161  {  {
1162      stat_t * s = &rc->stats[data->frame_num];          int64_t target;
1163      int overflow;          int64_t total_invariant;
1164      int desired;          double scaler;
1165      double dbytes;          int i, num_MBs;
     double curve_temp;  
     int capped_to_max_framesize = 0;  
1166    
1167          /*          /* We only scale texture data ! */
1168           * This function is quite long but easy to understand. In order to simplify          total_invariant  = rc->tot_invariant[XVID_TYPE_IVOP-1];
1169           * the code path (a bit), we treat 3 cases that can return immediatly.          total_invariant += rc->tot_invariant[XVID_TYPE_PVOP-1];
1170           */          total_invariant += rc->tot_invariant[XVID_TYPE_BVOP-1];
1171            /* don't forget to substract header bytes used in quant zones, otherwise we
1172             * counting them twice */
1173            total_invariant -= rc->tot_quant_invariant;
1174    
1175            /* We remove the bytes used by the fixed quantizer zones during first pass
1176             * with the same quants, so we know very precisely how much that
1177             * represents */
1178            target  = rc->target;
1179            target -= rc->tot_quant;
1180    
1181            /* Let's compute a linear scaler in order to perform curve scaling */
1182            scaler = (double)(target - total_invariant) / (double)(rc->tot_weighted);
1183    
1184    #ifdef SMART_OVERFLOW_SETTING
1185            if (scaler > 0.9) {
1186                    rc->param.max_overflow_degradation *= 5;
1187                    rc->param.max_overflow_improvement *= 5;
1188                    rc->param.overflow_control_strength *= 3;
1189            } else if (scaler > 0.6) {
1190                    rc->param.max_overflow_degradation *= 2;
1191                    rc->param.max_overflow_improvement *= 2;
1192                    rc->param.overflow_control_strength *= 2;
1193            } else {
1194                    rc->min_quant = 2;
1195            }
1196    #endif
1197    
1198          /* First case: Another plugin has already set a quantizer */          /* Compute min frame lengths (for each frame type) according to the number
1199      if (data->quant > 0)           * of MBs. We sum all block type counters of frame 0, this gives us the
1200                  return(0);           * number of MBs.
1201             *
1202             * We compare these hardcoded values with observed values in first pass
1203             * (determined in pre_process0).Then we keep the real minimum. */
1204    
1205            /* Number of MBs */
1206            num_MBs  = rc->stats[0].blks[0];
1207            num_MBs += rc->stats[0].blks[1];
1208            num_MBs += rc->stats[0].blks[2];
1209    
1210            /* Minimum for I frames */
1211            if(rc->min_length[XVID_TYPE_IVOP-1] > ((num_MBs*22) + 240) / 8)
1212                    rc->min_length[XVID_TYPE_IVOP-1] = ((num_MBs*22) + 240) / 8;
1213    
1214            /* Minimum for P/S frames */
1215            if(rc->min_length[XVID_TYPE_PVOP-1] > ((num_MBs) + 88)  / 8)
1216                    rc->min_length[XVID_TYPE_PVOP-1] = ((num_MBs) + 88)  / 8;
1217    
1218            /* Minimum for B frames */
1219            if(rc->min_length[XVID_TYPE_BVOP-1] > 8)
1220                    rc->min_length[XVID_TYPE_BVOP-1] = 8;
1221    
1222          /* Second case: We are in a Quant zone */          /* Perform an initial scale pass.
1223             *
1224             * If a frame size is scaled underneath our hardcoded minimums, then we
1225             * force the frame size to the minimum, and deduct the original & scaled
1226             * frame length from the original and target total lengths */
1227            for (i=0; i<rc->num_frames; i++) {
1228                    twopass_stat_t * s = &rc->stats[i];
1229                    int len;
1230    
1231                    /* No need to scale frame length for which a specific quantizer is
1232                     * specified thanks to zones */
1233          if (s->zone_mode == XVID_ZONE_QUANT) {          if (s->zone_mode == XVID_ZONE_QUANT) {
1234                            s->scaled_length = s->length;
1235                            continue;
1236                    }
1237    
1238                  rc->fq_error += s->weight;                  /* Compute the scaled length -- only non invariant data length is scaled */
1239                  data->quant = (int)rc->fq_error;                  len = s->invariant + (int)((double)(s->length-s->invariant) * scaler * s->weight);
                 rc->fq_error -= data->quant;  
1240    
1241                  s->desired_length = s->length;                  /* Compare with the computed minimum */
1242                    if (len < rc->min_length[s->type-1]) {
1243                            /* This is a 'forced size' frame, set its frame size to the
1244                             * computed minimum */
1245                            s->scaled_length = rc->min_length[s->type-1];
1246    
1247                  return(0);                          /* Remove both scaled and original size from their respective
1248                             * total counters, as we prepare a second pass for 'regular'
1249                             * frames */
1250                            target -= s->scaled_length;
1251                    } else {
1252                            /* Do nothing for now, we'll scale this later */
1253                            s->scaled_length = 0;
1254                    }
1255            }
1256    
1257            /* The first pass on data substracted all 'forced size' frames from the
1258             * total counters. Now, it's possible to scale the 'regular' frames. */
1259    
1260            /* Scaling factor for 'regular' frames */
1261            scaler = (double)(target - total_invariant) / (double)(rc->tot_weighted);
1262    
1263            /* Do another pass with the new scaler */
1264            for (i=0; i<rc->num_frames; i++) {
1265                    twopass_stat_t * s = &rc->stats[i];
1266    
1267                    /* Ignore frame with forced frame sizes */
1268                    if (s->scaled_length == 0)
1269                            s->scaled_length = s->invariant + (int)((double)(s->length-s->invariant) * scaler * s->weight);
1270          }          }
1271    
1272          /* Third case: insufficent stats data */          /* Job done */
1273          if (data->frame_num >= rc->num_frames)          return;
1274                  return 0;  }
1275    
1276          /*  /* Apply all user settings to the scaled curve
1277           * The last case is the one every normal minded developer should fear to   * This implies:
1278           * maintain in a project :-)   *   keyframe boosting
1279           */   *   high/low compression */
1280    static void
1281    scaled_curve_apply_advanced_parameters(rc_2pass2_t * rc)
1282    {
1283            int i;
1284            int64_t ivop_boost_total;
1285    
1286          /* XXX: why by 8 */          /* Reset the rate controller (per frame type) total byte counters */
1287          overflow = rc->overflow / 8;          for (i=0; i<3; i++) rc->tot_scaled_length[i] = 0;
1288    
1289          /*          /* Compute total bytes for each frame type */
1290           * The rc->overflow field represents the overflow in current scene (between two          for (i=0; i<rc->num_frames;i++) {
1291           * IFrames) so we must not forget to reset it if we are enetring a new scene                  twopass_stat_t *s = &rc->stats[i];
1292           */                  rc->tot_scaled_length[s->type-1] += s->scaled_length;
         if (s->type == XVID_TYPE_IVOP) {  
                 overflow = 0;  
1293          }          }
1294    
1295          desired = s->scaled_length;          /* First we compute the total amount of bits needed, as being described by
1296             * the scaled distribution. During this pass over the complete stats data,
1297             * we see how much bits two user settings will get/give from/to p&b frames:
1298             *  - keyframe boosting
1299             *  - keyframe distance penalty */
1300            rc->KF_idx = 0;
1301            ivop_boost_total = 0;
1302            for (i=0; i<rc->num_frames; i++) {
1303                    twopass_stat_t * s = &rc->stats[i];
1304    
1305          dbytes = desired;                  /* Some more work is needed for I frames */
1306          if (s->type == XVID_TYPE_IVOP) {          if (s->type == XVID_TYPE_IVOP) {
1307                  dbytes += desired * rc->param.keyframe_boost / 100;                          int ivop_boost;
         }  
         dbytes /= rc->movie_curve;  
1308    
1309          /*                          /* Accumulate bytes needed for keyframe boosting */
1310           * We are now entering in the hard part of the algo, it was first designed                          ivop_boost = s->scaled_length*rc->param.keyframe_boost/100;
          * to work with i/pframes only streams, so the way it computes things is  
          * adapted to pframes only. However we can use it if we just take care to  
          * scale the bframes sizes to pframes sizes using the ratio avg_p/avg_p and  
          * then before really using values depending on frame sizes, scaling the  
          * value again with the inverse ratio  
          */  
         if (s->type == XVID_TYPE_BVOP) {  
                 dbytes *= rc->avg_length[XVID_TYPE_PVOP-1] / rc->avg_length[XVID_TYPE_BVOP-1];  
         }  
1311    
1312          /*  #if 0 /* ToDo: decide how to apply kfthresholding */
1313           * Apply user's choosen Payback method. Payback helps bitrate to follow the  #endif
1314           * scaled curve "paying back" past errors in curve previsions.                          /* If the frame size drops under the minimum length, then cap ivop_boost */
1315           */                          if (ivop_boost + s->scaled_length < rc->min_length[XVID_TYPE_IVOP-1])
1316          if (rc->param.payback_method == XVID_PAYBACK_BIAS) {                                  ivop_boost = rc->min_length[XVID_TYPE_IVOP-1] - s->scaled_length;
1317                  desired =(int)(rc->curve_comp_error / rc->param.bitrate_payback_delay);  
1318          }else{                          /* Accumulate the ivop boost */
1319                  desired = (int)(rc->curve_comp_error * dbytes /                          ivop_boost_total += ivop_boost;
                                                 rc->avg_length[XVID_TYPE_PVOP-1] / rc->param.bitrate_payback_delay);  
1320    
1321                  if (labs(desired) > fabs(rc->curve_comp_error)) {                          /* Don't forget to update the keyframe index */
1322                          desired = (int)rc->curve_comp_error;                          rc->KF_idx++;
1323                  }                  }
1324          }          }
1325    
1326          rc->curve_comp_error -= desired;          /* Initialize the IBoost tax ratio for P/S/B frames
1327             *
1328             * This ratio has to be applied to p/b/s frames in order to reserve
1329             * additional bits for keyframes (keyframe boosting) or if too much
1330             * keyframe distance is applied, bits retrieved from the keyframes.
1331             *
1332             * ie pb_length *= rc->pb_iboost_tax_ratio;
1333             *
1334             *    gives the ideal length of a p/b frame */
1335    
1336          /*          /* Compute the total length of p/b/s frames (temporary storage into
1337           * Alt curve treatment is not that hard to understand though the formulas           * movie_curve) */
1338           * seem to be huge. Alt treatment is basically a way to soft/harden the          rc->pb_iboost_tax_ratio  = (double)rc->tot_scaled_length[XVID_TYPE_PVOP-1];
1339           * curve flux applying sine/linear/cosine ratios          rc->pb_iboost_tax_ratio += (double)rc->tot_scaled_length[XVID_TYPE_BVOP-1];
1340           */  
1341            /* Compute the ratio described above
1342             *     taxed_total = sum(0, n, tax*scaled_length)
1343             * <=> taxed_total = tax.sum(0, n, scaled_length)
1344             * <=> tax = taxed_total / original_total */
1345            rc->pb_iboost_tax_ratio =
1346                    (rc->pb_iboost_tax_ratio - ivop_boost_total) /
1347                    rc->pb_iboost_tax_ratio;
1348    
1349          /* XXX: warning */          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- IFrame boost tax ratio:%.2f\n",
1350          curve_temp = 0;                          rc->pb_iboost_tax_ratio);
1351    
1352          if (rc->param.use_alt_curve) {          /* Compute the average size of frames per frame type */
1353                  if (s->type != XVID_TYPE_IVOP)  {          for(i=0; i<3; i++) {
1354                          if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                  /* Special case for missing type or weird case */
1355                                  if (dbytes >= rc->alt_curve_high) {                  if (rc->count[i] == 0 || rc->pb_iboost_tax_ratio == 0) {
1356                                          curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev);                          rc->avg_length[i] = 1;
                                 } else {  
                                         switch(rc->param.alt_curve_type) {  
                                         case XVID_CURVE_SINE :  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * sin(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_high_diff)));  
                                                 break;  
                                         case XVID_CURVE_LINEAR :  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) / rc->alt_curve_high_diff);  
                                                 break;  
                                         case XVID_CURVE_COSINE :  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_high_diff))));  
                                         }  
                                 }  
1357                          } else {                          } else {
1358                                  if (dbytes <= rc->alt_curve_low){                          rc->avg_length[i] = rc->tot_scaled_length[i];
1359                                          curve_temp = dbytes;  
1360                            if (i == (XVID_TYPE_IVOP-1)) {
1361                                    /* I Frames total has to be added the boost total */
1362                                    rc->avg_length[i] += ivop_boost_total;
1363                                  } else {                                  } else {
1364                                          switch(rc->param.alt_curve_type) {                                  /* P/B frames has to taxed */
1365                                          case XVID_CURVE_SINE :                                  rc->avg_length[i] *= rc->pb_iboost_tax_ratio;
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * sin(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_low_diff)));  
                                                 break;  
                                         case XVID_CURVE_LINEAR :  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) / rc->alt_curve_low_diff);  
                                                 break;  
                                         case XVID_CURVE_COSINE :  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual + rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_low_diff))));  
1366                                          }                                          }
1367    
1368                            /* Finally compute the average frame size */
1369                            rc->avg_length[i] /= (double)rc->count[i];
1370                                  }                                  }
1371                          }                          }
1372    
1373                          /*          /* Assymetric curve compression */
1374                           * End of code path for curve_temp, as told earlier, we are now          if (rc->param.curve_compression_high || rc->param.curve_compression_low) {
1375                           * obliged to scale the value to a bframe one using the inverse                  double symetric_total;
1376                           * ratio applied earlier                  double assymetric_delta_total;
                          */  
                         if (s->type == XVID_TYPE_BVOP)  
                                 curve_temp *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
1377    
1378                          curve_temp = curve_temp * rc->curve_comp_scale + rc->alt_curve_curve_bias_bonus;                  /* Like I frame boosting, assymetric curve compression modifies the total
1379                     * amount of needed bits, we must compute the ratio so we can prescale
1380                     lengths */
1381                    symetric_total = 0;
1382                    assymetric_delta_total = 0;
1383                    for (i=0; i<rc->num_frames; i++) {
1384                            double assymetric_delta;
1385                            double dbytes;
1386                            twopass_stat_t * s = &rc->stats[i];
1387    
1388                          desired += ((int)curve_temp);                          /* I Frames are not concerned by assymetric scaling */
1389                          rc->curve_comp_error += curve_temp - (int)curve_temp;                          if (s->type == XVID_TYPE_IVOP)
1390                  } else {                                  continue;
                         /*  
                          * End of code path for dbytes, as told earlier, we are now  
                          * obliged to scale the value to a bframe one using the inverse  
                          * ratio applied earlier  
                          */  
                         if (s->type == XVID_TYPE_BVOP)  
                                 dbytes *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
1391    
1392                          desired += ((int)dbytes);                          /* During the real run, we would have to apply the iboost tax */
1393                          rc->curve_comp_error += dbytes - (int)dbytes;                          dbytes = s->scaled_length * rc->pb_iboost_tax_ratio;
                 }  
1394    
1395          } else if ((rc->param.curve_compression_high + rc->param.curve_compression_low) &&      s->type != XVID_TYPE_IVOP) {                          /* Update the symmetric curve compression total */
1396                            symetric_total += dbytes;
1397    
1398                  curve_temp = rc->curve_comp_scale;                          /* Apply assymetric curve compression */
1399                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                          if (dbytes > rc->avg_length[s->type-1])
1400                          curve_temp *= ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_high / 100.0);                                  assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * (double)rc->param.curve_compression_high / 100.0f;
1401                  } else {                          else
1402                          curve_temp *= ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_low / 100.0);                                  assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * (double)rc->param.curve_compression_low  / 100.0f;
                 }  
1403    
1404                  /*                          /* Cap to the minimum frame size if needed */
1405                   * End of code path for curve_temp, as told earlier, we are now                          if (dbytes + assymetric_delta < rc->min_length[s->type-1])
1406                   * obliged to scale the value to a bframe one using the inverse                                  assymetric_delta = rc->min_length[s->type-1] - dbytes;
1407                   * ratio applied earlier  
1408                   */                          /* Accumulate after assymetric curve compression */
1409                  if (s->type == XVID_TYPE_BVOP)                          assymetric_delta_total += assymetric_delta;
1410                          curve_temp *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];                  }
1411    
1412                  desired += (int)curve_temp;                  /* Compute the tax that all p/b frames have to pay in order to respect the
1413                  rc->curve_comp_error += curve_temp - (int)curve_temp;                   * bit distribution changes that the assymetric compression curve imposes
1414                     * We want assymetric_total = sum(0, n-1, tax.scaled_length)
1415                     *      ie assymetric_total = ratio.sum(0, n-1, scaled_length)
1416                     *         ratio = assymetric_total / symmetric_total */
1417                    rc->assymetric_tax_ratio = ((double)symetric_total - (double)assymetric_delta_total) / (double)symetric_total;
1418          } else {          } else {
1419                  /*                  rc->assymetric_tax_ratio = 1.0f;
                  * End of code path for dbytes, as told earlier, we are now  
                  * obliged to scale the value to a bframe one using the inverse  
                  * ratio applied earlier  
                  */  
                 if (s->type == XVID_TYPE_BVOP){  
                         dbytes *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
1420                  }                  }
1421    
1422                  desired += (int)dbytes;          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Assymetric tax ratio:%.2f\n", rc->assymetric_tax_ratio);
1423                  rc->curve_comp_error += dbytes - (int)dbytes;  
1424            /* Last bits that need to be reset */
1425            rc->overflow = 0;
1426            rc->KFoverflow = 0;
1427            rc->KFoverflow_partial = 0;
1428            rc->KF_idx = 0;
1429            rc->desired_total = 0;
1430            rc->real_total = 0;
1431    
1432            /* Job done */
1433            return;
1434          }          }
1435    
1436    /*****************************************************************************
1437     * VBV compliancy check and scale
1438     * MPEG-4 standard specifies certain restrictions for bitrate/framesize in VBR
1439     * to enable playback on devices with limited readspeed and memory (and which
1440     * aren't...)
1441     *
1442     * DivX profiles have 2 criteria: VBV as in MPEG standard
1443     *                                a limit on peak bitrate for any 3 seconds
1444     *
1445     * But if VBV is fulfilled, peakrate is automatically fulfilled in any profile
1446     * define so far, so we check for it (for completeness) but correct only VBV
1447     *
1448     *****************************************************************************/
1449    
1450          /*  #define VBV_COMPLIANT 0
1451           * We can't do bigger frames than first pass, this would be stupid as first  #define VBV_UNDERFLOW 1 /* video buffer runs empty */
1452           * pass is quant=2 and that reaching quant=1 is not worth it. We would lose  #define VBV_OVERFLOW 2  /* doesn't exist for VBR encoding */
1453           * many bytes and we would not not gain much quality.  #define VBV_PEAKRATE 4  /* peak bitrate (within 3s) violated */
1454    
1455    static int
1456    check_curve_for_vbv_compliancy(rc_2pass2_t * rc, const float fps)
1457    {
1458            /* We do all calculations in float, for higher accuracy,
1459             * and in bytes for convenience.
1460             *
1461             * typical values from DivX Home Theater profile:
1462             *  vbv_size= 384*1024 (384kB)
1463             *  vbv_initial= 288*1024 (75% fill)
1464             *  maxrate= 4854000 (4.854MBps)
1465             *  peakrate= 8000000 (8MBps)
1466             *
1467             *  PAL: offset3s = 75 (3 seconds of 25fps)
1468             *  NTSC: offset3s = 90 (3 seconds of 29.97fps) or 72 (3 seconds of 23.976fps)
1469           */           */
         if (desired > s->length) {  
                 rc->curve_comp_error += desired - s->length;  
                 desired = s->length;  
         }else{  
                 if (desired < rc->min_length[s->type-1]) {  
                         if (s->type == XVID_TYPE_IVOP){  
                                 rc->curve_comp_error -= rc->min_length[XVID_TYPE_IVOP-1] - desired;  
                         }  
                         desired = rc->min_length[s->type-1];  
                 }  
         }  
1470    
1471          s->desired_length = desired;          const float vbv_size = (float)rc->param.vbv_size/8.f;
1472            float vbvfill = (float)rc->param.vbv_initial/8.f;
1473            float vbvmin;
1474    
1475            const float maxrate = (float)rc->param.vbv_maxrate;
1476            const float peakrate = (float)rc->param.vbv_peakrate;
1477            const float r0 = (int)(maxrate/fps+0.5)/8.f;
1478    
1479            int bytes3s = 0;
1480            int offset3s = (int)(3.f*fps+0.5);
1481            int i;
1482    
1483          /* if this keyframe is too close to the next, reduce it's byte allotment          /* 1Gbit should be enough to inuitialize the vbvmin
1484             XXX: why do we do this after setting the desired length  */           *      an arbitrary high value */
1485            vbvmin = 1000*1000*1000;
1486    
1487          if (s->type == XVID_TYPE_IVOP) {          for (i=0; i<rc->num_frames; i++) {
1488                  int KFdistance = rc->keyframe_locations[rc->KF_idx] - rc->keyframe_locations[rc->KF_idx - 1];                  /* DivX 3s peak bitrate check  */
1489                    bytes3s += rc->stats[i].scaled_length;
1490                    if (i>=offset3s)
1491                            bytes3s -= rc->stats[i-offset3s].scaled_length;
1492    
1493        /* ignore peakrate constraint if peakrate is <= 0.f */
1494                    if (peakrate>0.f && 8.f*bytes3s > 3*peakrate)
1495                            return(VBV_PEAKRATE);
1496    
1497                  if (KFdistance < rc->param.kftreshold) {                  /* update vbv fill level */
1498                    vbvfill += r0 - rc->stats[i].scaled_length;
1499    
1500                          KFdistance = KFdistance - rc->param.min_key_interval;                  /* this check is _NOT_ an "overflow"! only reading from disk stops then */
1501                    if (vbvfill > vbv_size)
1502                            vbvfill = vbv_size;
1503    
1504                          if (KFdistance >= 0) {                  /* but THIS would be an underflow. report it! */
1505                                  int KF_min_size;                  if (vbvfill < 0)
1506                            return(VBV_UNDERFLOW);
1507    
1508                                  KF_min_size = desired * (100 - rc->param.kfreduction) / 100;                  /* Store the minimum buffer filling */
1509                                  if (KF_min_size < 1)                  if (vbvfill < vbvmin)
1510                                          KF_min_size = 1;                          vbvmin = vbvfill;
1511            }
1512    
1513                                  desired = KF_min_size + (desired - KF_min_size) * KFdistance /          DPRINTF(XVID_DEBUG_RC, "[xvid rc] Minimum buffer fill: %f bytes\n", vbvmin);
                                         (rc->param.kftreshold - rc->param.min_key_interval);  
1514    
1515                                  if (desired < 1)          return(VBV_COMPLIANT);
                                         desired = 1;  
1516                          }                          }
1517    
1518    
1519    static int
1520    scale_curve_for_vbv_compliancy(rc_2pass2_t * rc, const float fps)
1521    {
1522            /* correct any VBV violations. Peak bitrate violations disappears
1523             * by this automatically
1524             *
1525             * This implementation follows
1526             *
1527             * Westerink, Rajagopalan, Gonzales "Two-pass MPEG-2 variable-bitrate encoding"
1528             * IBM J. RES. DEVELOP. VOL 43, No. 4, July 1999, p.471--488
1529             *
1530             * Thanks, guys! This paper rocks!!! */
1531    
1532            /* For each scene of len N, we have to check up to N^2 possible buffer fills.
1533             * This works well with MPEG-2 where N==12 or so, but for MPEG-4 it's a
1534             * little slow...
1535             *
1536             * TODO: Better control on VBVfill between scenes */
1537    
1538            const float vbv_size = (float)rc->param.vbv_size/8.f;
1539            const float vbv_initial = (float)rc->param.vbv_initial/8.f;
1540    
1541            const float maxrate = 0.9*rc->param.vbv_maxrate;
1542            const float vbv_low = 0.10f*vbv_size;
1543            const float r0 = (int)(maxrate/fps+0.5)/8.f;
1544    
1545            int i,k,l,n,violation = 0;
1546            float *scenefactor;
1547            int *scenestart;
1548            int *scenelength;
1549    
1550            /* first step: determine how many "scenes" there are and store their
1551             * boundaries we could get all this from existing keyframe_positions,
1552             * somehow, but there we don't have a min_scenelength, and it's no big
1553             * deal to get it again. */
1554    
1555            const int min_scenelength = (int)(fps+0.5);
1556            int num_scenes = 0;
1557            int last_scene = -999;
1558            for (i=0; i<rc->num_frames; i++) {
1559                    if ((rc->stats[i].type == XVID_TYPE_IVOP) && (i-last_scene>min_scenelength)) {
1560                            last_scene = i;
1561                            num_scenes++;
1562                  }                  }
1563          }          }
1564    
1565          overflow = (int)((double)overflow * desired / rc->avg_length[XVID_TYPE_PVOP-1]);          scenefactor = (float*)malloc(num_scenes*sizeof(float));
1566            scenestart = (int*)malloc(num_scenes*sizeof(int));
1567            scenelength = (int*)malloc(num_scenes*sizeof(int));
1568    
1569          /* Reign in overflow with huge frames */          if ((!scenefactor) || (!scenestart) || (!scenelength) ) {
1570          if (labs(overflow) > labs(rc->overflow)) {                  free(scenefactor);
1571                  overflow = rc->overflow;                  free(scenestart);
1572                    free(scenelength);
1573                    /* remember: free(0) is valid and does exactly nothing. */
1574                    return(-1);
1575          }          }
1576    
1577          /* Make sure overflow doesn't run away */          /* count again and safe the length/position */
         if (overflow > desired * rc->param.max_overflow_improvement / 100) {  
                 desired += (overflow <= desired) ? desired * rc->param.max_overflow_improvement / 100 :  
                         overflow * rc->param.max_overflow_improvement / 100;  
         } else if (overflow < desired * rc->param.max_overflow_degradation / -100){  
                 desired += desired * rc->param.max_overflow_degradation / -100;  
         } else {  
                 desired += overflow;  
         }  
1578    
1579          /* Make sure we are not higher than desired frame size */          num_scenes = 0;
1580          if (desired > rc->max_length) {          last_scene = -999;
1581                  capped_to_max_framesize = 1;          for (i=0; i<rc->num_frames; i++) {
1582                  desired = rc->max_length;                  if ((rc->stats[i].type == XVID_TYPE_IVOP) && (i-last_scene>min_scenelength)) {
1583                  DPRINTF(XVID_DEBUG_RC,"[%i] Capped to maximum frame size\n",                          if (num_scenes>0) {
1584                                  data->frame_num);                                  scenelength[num_scenes-1]=i-last_scene;
1585          }          }
1586                            scenestart[num_scenes]=i;
1587          /* Make sure to not scale below the minimum framesize */                          num_scenes++;
1588          if (desired < rc->min_length[s->type-1]) {                          last_scene = i;
                 desired = rc->min_length[s->type-1];  
                 DPRINTF(XVID_DEBUG_RC,"[%i] Capped to minimum frame size\n",  
                                 data->frame_num);  
1589          }          }
1590            }
1591            scenelength[num_scenes-1]=i-last_scene;
1592    
1593          /*          /* second step: check for each scene, how much we can scale its frames up or
1594           * Don't laugh at this very 'simple' quant<->filesize relationship, it           * down such that the VBV restriction is just fulfilled */
1595           * proves to be acurate enough for our algorithm  #define R(k,n) (((n)+1-(k))*r0)     /* how much enters the buffer between frame k and n */
1596           */          for (l=0; l<num_scenes;l++) {
1597          data->quant= (s->quant * s->length) / desired;                  const int start = scenestart[l];
1598                    const int length = scenelength[l];
1599                    twopass_stat_t * frames = &rc->stats[start];
1600    
1601          /* Let's clip the computed quantizer, if needed */                  float S0n,Skn;
1602          if (data->quant < 1) {                  float f,minf = 99999.f;
                 data->quant = 1;  
         } else if (data->quant > 31) {  
                 data->quant = 31;  
         } else if (s->type != XVID_TYPE_IVOP) {  
1603    
1604                  /*                  S0n=0.;
1605                   * The frame quantizer has not been clipped, this appear to be a good                  for (n=0;n<=length-1;n++) {
1606                   * computed quantizer, however past frames give us some info about how                          S0n += frames[n].scaled_length;
                  * this quantizer performs against the algo prevision. Let's use this  
                  * prevision to increase the quantizer when we observe a too big  
                  * accumulated error  
                  */  
                 if (s->type== XVID_TYPE_BVOP) {  
                         rc->bquant_error[data->quant] += ((double)(s->quant * s->length) / desired) - data->quant;  
1607    
1608                          if (rc->bquant_error[data->quant] >= 1.0) {                          k = 0;
1609                                  rc->bquant_error[data->quant] -= 1.0;                          Skn = S0n;
1610                                  data->quant++;                          f = (R(k,n-1) + (vbv_initial - vbv_low)) / Skn;
1611                          }                          if (f < minf)
1612                  } else {                                  minf = f;
1613                          rc->pquant_error[data->quant] += ((double)(s->quant * s->length) / desired) - data->quant;  
1614                            for (k=1;k<=n;k++) {
1615                                    Skn -= frames[k].scaled_length;
1616    
1617                          if (rc->pquant_error[data->quant] >= 1.0) {                                  f = (R(k,n-1) + (vbv_size - vbv_low)) / Skn;
1618                                  rc->pquant_error[data->quant] -= 1.0;                                  if (f < minf)
1619                                  ++data->quant;                                          minf = f;
1620                          }                          }
1621                  }                  }
1622    
1623                    /* special case: at the end, fill buffer up to vbv_initial again
1624                     *
1625                     * TODO: Allow other values for buffer fill between scenes
1626                     * e.g. if n=N is smallest f-value, then check for better value */
1627    
1628                    n=length;
1629                    k=0;
1630                    Skn = S0n;
1631                    f = R(k,n-1)/Skn;
1632                    if (f < minf)
1633                            minf = f;
1634    
1635                    for (k=1;k<=n-1;k++) {
1636                            Skn -= frames[k].scaled_length;
1637    
1638                            f = (R(k,n-1) + (vbv_initial - vbv_low)) / Skn;
1639                            if (f < minf)
1640                                    minf = f;
1641          }          }
1642    
1643          /*                  DPRINTF(XVID_DEBUG_RC, "[xvid rc] Scene %d (Frames %d-%d): VBVfactor %f\n",
1644           * Now we have a computed quant that is in the right quante range, with a                                  l, start, start+length-1 , minf);
1645           * possible +1 correction due to cumulated error. We can now safely clip  
1646           * the quantizer again with user's quant ranges. "Safely" means the Rate                  scenefactor[l] = minf;
          * Control could learn more about this quantizer, this knowledge is useful  
          * for future frames even if it this quantizer won't be really used atm,  
          * that's why we don't perform this clipping earlier.  
          */  
         if (data->quant < data->min_quant[s->type-1]) {  
                 data->quant = data->min_quant[s->type-1];  
         } else if (data->quant > data->max_quant[s->type-1]) {  
                 data->quant = data->max_quant[s->type-1];  
1647          }          }
1648    #undef R
1649    
1650          /*          /* last step: now we know of any scene how much it can be scaled up or down
1651           * To avoid big quality jumps from frame to frame, we apply a "security"           * without violating VBV. Next, distribute bits from the evil scenes to the
1652           * rule that makes |last_quant - new_quant| <= 2. This rule only applies           * good ones */
1653           * to predicted frames (P and B)          do {
1654           */                  float S_red = 0.f;    /* how much to redistribute */
1655          if (s->type != XVID_TYPE_IVOP && rc->last_quant[s->type-1] && capped_to_max_framesize == 0) {                  float S_elig = 0.f;   /* sum of bit for those scenes you can still swallow something*/
1656                    float f_red;
1657                    int l;
1658    
1659                  if (data->quant > rc->last_quant[s->type-1] + 2) {                  /* check how much is wrong */
1660                          data->quant = rc->last_quant[s->type-1] + 2;                  for (l=0;l<num_scenes;l++) {
1661                          DPRINTF(XVID_DEBUG_RC,                          const int start = scenestart[l];
1662                                          "[%i] p/b-frame quantizer prevented from rising too steeply\n",                          const int length = scenelength[l];
1663                                          data->frame_num);                          twopass_stat_t * frames = &rc->stats[start];
1664    
1665                            /* exactly 1 means "don't touch this anymore!" */
1666                            if (scenefactor[l] == 1.)
1667                                    continue;
1668    
1669                            /* within limits */
1670                            if (scenefactor[l] > 1.) {
1671                                    for (n= 0; n < length; n++)
1672                                            S_elig += frames[n].scaled_length;
1673                            } else {
1674                                    /* underflowing segment */
1675                                    for (n= 0; n < length; n++) {
1676                                            float newbytes = (float)frames[n].scaled_length * scenefactor[l];
1677                                            S_red += (float)frames[n].scaled_length - (float)newbytes;
1678                                            frames[n].scaled_length =(int)newbytes;
1679                  }                  }
1680                  if (data->quant < rc->last_quant[s->type-1] - 2) {                                  scenefactor[l] = 1.f;
                         data->quant = rc->last_quant[s->type-1] - 2;  
                         DPRINTF(XVID_DEBUG_RC,  
                                         "[%i] p/b-frame quantizer prevented from falling too steeply\n",  
                                         data->frame_num);  
1681                  }                  }
1682          }          }
1683    
1684          /*                  /* no more underflows */
1685           * We don't want to pollute the RC history results when our computed quant                  if (S_red < 1.f)
1686           * has been computed from a capped frame size                          break;
          */  
         if (capped_to_max_framesize == 0) {  
                 rc->last_quant[s->type-1] = data->quant;  
         }  
1687    
1688          return 0;                  if (S_elig < 1.f) {
1689                            DPRINTF(XVID_DEBUG_RC, "[xvid rc] Everything underflowing.\n");
1690                            free(scenefactor);
1691                            free(scenestart);
1692                            free(scenelength);
1693                            return(-2);
1694  }  }
1695    
1696                    f_red = (1.f + S_red/S_elig);
1697    
1698                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] Moving %.0f kB to avoid buffer underflow, correction factor: %.5f\n",
1699                                    S_red/1024.f, f_red);
1700    
1701  static int rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)                  violation=0;
1702  {                  /* scale remaining scenes up to meet total size */
1703      stat_t * s = &rc->stats[data->frame_num];                  for (l=0; l<num_scenes; l++) {
1704                            const int start = scenestart[l];
1705                            const int length = scenelength[l];
1706                            twopass_stat_t * frames = &rc->stats[start];
1707    
1708          /* Insufficent stats data */                          if (scenefactor[l] == 1.)
1709      if (data->frame_num >= rc->num_frames)                                  continue;
         return 0;  
1710    
1711      rc->quant_count[data->quant]++;                          /* there shouldn't be any segments with factor<1 left, so all the rest is >1 */
1712                            for (n= 0; n < length; n++) {
1713                                    frames[n].scaled_length = (int)(frames[n].scaled_length * f_red + 0.5);
1714                            }
1715    
1716      if (data->type == XVID_TYPE_IVOP) {                          scenefactor[l] /= f_red;
1717          int kfdiff = (rc->keyframe_locations[rc->KF_idx] -      rc->keyframe_locations[rc->KF_idx - 1]);                          if (scenefactor[l] < 1.f)
1718                                    violation=1;
1719                    }
1720    
1721          rc->overflow += rc->KFoverflow;          } while (violation);
         rc->KFoverflow = s->desired_length - data->length;  
1722    
1723          if (kfdiff > 1) {  // non-consecutive keyframes          free(scenefactor);
1724              rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);          free(scenestart);
1725          }else{ // consecutive keyframes          free(scenelength);
1726                          rc->overflow += rc->KFoverflow;          return(0);
                         rc->KFoverflow = 0;  
                         rc->KFoverflow_partial = 0;  
1727          }          }
1728          rc->KF_idx++;  
1729      }else{  
1730          // distribute part of the keyframe overflow  /*****************************************************************************
1731          rc->overflow += s->desired_length - data->length + rc->KFoverflow_partial;   * Still more low level stuff (nothing to do with stats treatment)
1732          rc->KFoverflow -= rc->KFoverflow_partial;   ****************************************************************************/
1733    
1734    /* This function returns an allocated string containing a complete line read
1735     * from the file starting at the current position */
1736    static char *
1737    readline(FILE *f)
1738    {
1739            char *buffer = NULL;
1740            int buffer_size = 0;
1741            int pos = 0;
1742    
1743            do {
1744                    int c;
1745    
1746                    /* Read a character from the stream */
1747                    c = fgetc(f);
1748    
1749                    /* Is that EOF or new line ? */
1750                    if(c == EOF || c == '\n')
1751                            break;
1752    
1753                    /* Do we have to update buffer ? */
1754                    if(pos >= buffer_size - 1) {
1755                            buffer_size += BUF_SZ;
1756                            buffer = (char*)realloc(buffer, buffer_size);
1757                            if (buffer == NULL)
1758                                    return(NULL);
1759      }      }
1760    
1761      DPRINTF(XVID_DEBUG_RC, "[%i] quant:%i stats1:%i scaled:%i actual:%i overflow:%i\n",                  buffer[pos] = c;
1762          data->frame_num,                  pos++;
1763          data->quant,          } while(1);
         s->length,  
         s->scaled_length,  
         data->length,  
         rc->overflow);  
1764    
1765      return(0);          /* Read \n or EOF */
1766            if (buffer == NULL) {
1767                    /* EOF, so we reached the end of the file, return NULL */
1768                    if(feof(f))
1769                            return(NULL);
1770    
1771                    /* Just an empty line with just a newline, allocate a 1 byte buffer to
1772                     * store a zero length string */
1773                    buffer = (char*)malloc(1);
1774                    if(buffer == NULL)
1775                            return(NULL);
1776  }  }
1777    
1778            /* Zero terminated string */
1779            buffer[pos] = '\0';
1780    
1781            return(buffer);
1782    }
1783    
1784  int xvid_plugin_2pass2(void * handle, int opt, void * param1, void * param2)  /* This function returns a pointer to the first non space char in the given
1785     * string */
1786    static char *
1787    skipspaces(char *string)
1788  {  {
1789      switch(opt)          const char spaces[] =
1790      {      {
1791      case XVID_PLG_INFO :                          ' ','\t','\0'
1792          return 0;                  };
1793            const char *spacechar = spaces;
1794    
1795            if (string == NULL) return(NULL);
1796    
1797            while (*string != '\0') {
1798                    /* Test against space chars */
1799                    while (*spacechar != '\0') {
1800                            if (*string == *spacechar) {
1801                                    string++;
1802                                    spacechar = spaces;
1803                                    break;
1804                            }
1805                            spacechar++;
1806                    }
1807    
1808      case XVID_PLG_CREATE :                  /* No space char */
1809          return rc_2pass2_create((xvid_plg_create_t*)param1, param2);                  if (*spacechar == '\0') return(string);
1810            }
1811    
1812      case XVID_PLG_DESTROY :          return(string);
1813          return rc_2pass2_destroy((rc_2pass2_t*)handle, (xvid_plg_destroy_t*)param1);  }
1814    
1815      case XVID_PLG_BEFORE :  /* This function returns a boolean that tells if the string is only a
1816          return rc_2pass2_before((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);   * comment */
1817    static int
1818    iscomment(char *string)
1819    {
1820            const char comments[] =
1821                    {
1822                            '#',';', '%', '\0'
1823                    };
1824            const char *cmtchar = comments;
1825            int iscomment = 0;
1826    
1827            if (string == NULL) return(1);
1828    
1829            string = skipspaces(string);
1830    
1831            while(*cmtchar != '\0') {
1832                    if(*string == *cmtchar) {
1833                            iscomment = 1;
1834                            break;
1835                    }
1836                    cmtchar++;
1837            }
1838    
1839      case XVID_PLG_AFTER :          return(iscomment);
         return rc_2pass2_after((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);  
1840      }      }
1841    
1842      return XVID_ERR_FAIL;  #if 0
1843    static void
1844    stats_print(rc_2pass2_t * rc)
1845    {
1846            int i;
1847            const char frame_type[4] = { 'i', 'p', 'b', 's'};
1848    
1849            for (i=0; i<rc->num_frames; i++) {
1850                    twopass_stat_t *s = &rc->stats[i];
1851                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- frame:%d type:%c quant:%d stats:%d scaled:%d desired:%d actual:%d overflow(%c):%.2f\n",
1852                                    i, frame_type[s->type-1], -1, s->length, s->scaled_length,
1853                                    s->desired_length, -1, frame_type[s->type-1], -1.0f);
1854            }
1855  }  }
1856    #endif
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