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revision 1.1.2.7, Thu May 22 10:57:33 2003 UTC revision 1.4, Fri Jun 11 08:44:30 2004 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    /* automtically 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>
 #define RAD2DEG 57.295779513082320876798154814105  
 #define DEG2RAD 0.017453292519943295769236907684886  
45    
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");  
             s->type = XVID_TYPE_PVOP;  
341          }          }
342    
343          i++;          for (i=0; i<3; i++) rc->last_quant[i] = 0;
     }  
344    
345      rc->num_frames = i;          rc->fq_error = 0;
346            rc->min_quant = 1;
347    
348          fclose(f);          /* 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            /* 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      return 1;          /* 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            /* 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                     * - 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, "%i %i %i %i\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  void pre_process0(rc_2pass2_t * rc)          /* If we have a user bitrate, it means it's an internal curve scaling */
446  {          if (rc->param.bitrate) {
447      int i,j;                  /* Perform internal curve scaling */
448                    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;  
449      }      }
450    
451      for (i=j=0; i<rc->num_frames; i++) {          /* Apply advanced curve options, and compute some parameters in order to
452          stat_t * s = &rc->stats[i];           * shape the curve in the BEFORE/AFTER pair of functions */
453            scaled_curve_apply_advanced_parameters(rc);
454    
455          rc->count[s->type-1]++;  /* Check curve for VBV compliancy and rescale if necessary */
         rc->tot_length[s->type-1] += s->length;  
456    
457          if (i == 0 || s->length < rc->min_length[s->type-1]) {  #ifdef VBV_FORCE
458              rc->min_length[s->type-1] = s->length;    if (rc->param.vbv_size==0)
459      {
460        rc->param.vbv_size      =  3145728;
461        rc->param.vbv_initial   =  2359296;
462        rc->param.vbv_maxrate  =  4000000;
463        rc->param.vbv_peakrate = 10000000;
464          }          }
465    #endif
466    
467          if (i == 0 || s->length > rc->max_length) {    if (rc->param.vbv_size>0)    /* vbv_size==0 switches VBV check off */
468              rc->max_length = s->length;    {
469          }      const double fps = (double)create->fbase/(double)create->fincr;
470        int status = check_curve_for_vbv_compliancy(rc, fps);
471    #ifdef VBV_DEBUG
472        if (status)
473          fprintf(stderr,"underflow detected\n Scaling Curve for compliancy... ");
474    #endif
475    
476          if (s->type == XVID_TYPE_IVOP) {          status = scale_curve_for_vbv_compliancy(rc, fps);
477              rc->keyframe_locations[j] = i;  
478              j++;  #ifdef VBV_DEBUG
479          if (status==0)
480            fprintf(stderr,"done.\n");
481          else
482            fprintf(stderr,"impossible.\n");
483    #endif
484          }          }
485            *handle = rc;
486            return(0);
487      }      }
488    
489          /*  /*----------------------------------------------------------------------------
490           * 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;  
 }  
491    
492    static int
493    rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy)
494    {
495            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- target_total:%lld desired_total:%.2f (%.2f%%) actual_total:%.2f (%.2f%%)\n",
496                            rc->target,
497                            rc->desired_total,
498                            100*rc->desired_total/(double)rc->target,
499                            rc->real_total,
500                            100*rc->real_total/(double)rc->target);
501    
502  /* calculate zone weight "center" */          free(rc->keyframe_locations);
503            free(rc->stats);
504            free(rc);
505            return(0);
506    }
507    
508    /*----------------------------------------------------------------------------
509     *--------------------------------------------------------------------------*/
510    
511  static void zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)  static int
512    rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)
513  {  {
514      int i,j;          twopass_stat_t * s = &rc->stats[data->frame_num];
515      int n = 0;          double dbytes;
516            double scaled_quant;
517            double overflow;
518            int capped_to_max_framesize = 0;
519    
520      rc->avg_weight = 0.0;          /* This function is quite long but easy to understand. In order to simplify
521      rc->tot_quant = 0;           * the code path (a bit), we treat 3 cases that can return immediatly. */
522    
523            /* First case: Another plugin has already set a quantizer */
524            if (data->quant > 0)
525                    return(0);
526    
527      if (create->num_zones == 0) {          /* Second case: insufficent stats data
528          for (j = 0; j < rc->num_frames; j++) {           * We can't guess much what we should do, let core decide all alone */
529              rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;          if (data->frame_num >= rc->num_frames) {
530              rc->stats[j].weight = 1.0;                  DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- stats file too short (now processing frame %d)",
531          }                          data->frame_num);
532          rc->avg_weight += rc->num_frames * 1.0;                  return(0);
         n += rc->num_frames;  
533      }      }
534    
535            /* Third case: We are in a Quant zone
536             * Quant zones must just ensure we use the same settings as first pass
537             * So set the quantizer and the type */
538            if (s->zone_mode == XVID_ZONE_QUANT) {
539                    /* Quant stuff */
540                    rc->fq_error += s->weight;
541                    data->quant = (int)rc->fq_error;
542                    rc->fq_error -= data->quant;
543    
544      for(i=0; i < create->num_zones; i++) {                  /* The type stuff */
545                    data->type = s->type;
546    
547          int next = (i+1<create->num_zones) ? create->zones[i+1].frame : rc->num_frames;                  /* The only required data for AFTER step is this one for the overflow
548                     * control */
549                    s->desired_length = s->length;
550    
551          if (i==0 && create->zones[i].frame > 0) {                  return(0);
             for (j = 0; j < create->zones[i].frame && j < rc->num_frames; j++) {  
                 rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;  
                 rc->stats[j].weight = 1.0;  
             }  
             rc->avg_weight += create->zones[i].frame * 1.0;  
             n += create->zones[i].frame;  
552          }          }
553    
         if (create->zones[i].mode == XVID_ZONE_WEIGHT) {  
             for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {  
                 rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;  
                 rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;  
             }  
             next -= create->zones[i].frame;  
             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;  
             }  
         }  
     }  
     rc->avg_weight = n>0 ? rc->avg_weight/n : 1.0;  
554    
555      DPRINTF(XVID_DEBUG_RC, "center_weight: %f (for %i frames);   fixed_bytes: %i\n", rc->avg_weight, n, rc->tot_quant);          /*************************************************************************/
556  }          /*************************************************************************/
557            /*************************************************************************/
558    
559            /*-------------------------------------------------------------------------
560             * Frame bit allocation first part
561             *
562             * First steps apply user settings, just like it is done in the theoritical
563             * scaled_curve_apply_advanced_parameters
564             *-----------------------------------------------------------------------*/
565    
566  /* scale the curve */          /* Set desired to what we are wanting to obtain for this frame */
567            dbytes = (double)s->scaled_length;
568    
569  static void internal_scale(rc_2pass2_t *rc)          /* IFrame user settings*/
570  {          if (s->type == XVID_TYPE_IVOP) {
571          int64_t target  = rc->target - rc->tot_quant;                  /* Keyframe boosting -- All keyframes benefit from it */
572          int64_t pass1_length = rc->tot_length[0] + rc->tot_length[1] + rc->tot_length[2] - rc->tot_quant;                  dbytes += dbytes*rc->param.keyframe_boost / 100;
         int min_size[3];  
         double scaler;  
         int i;  
573    
574    #if 0 /* ToDo: decide how to apply kfthresholding */
575    #endif
576            } else {
577    
578          /* perform an initial scale pass.                  /* P/S/B frames must reserve some bits for iframe boosting */
579             if a frame size is scaled underneath our hardcoded minimums, then we force the                  dbytes *= rc->pb_iboost_tax_ratio;
            frame size to the minimum, and deduct the original & scaled frmae length from the  
            original and target total lengths */  
580    
581          min_size[0] = ((rc->stats[0].blks[0]*22) + 240) / 8;                  /* Apply assymetric curve compression */
582          min_size[1] = (rc->stats[0].blks[0] + 88) / 8;                  if (rc->param.curve_compression_high || rc->param.curve_compression_low) {
583          min_size[2] = 8;                          double assymetric_delta;
584    
585                            /* Compute the assymetric delta, this is computed before applying
586                             * the tax, as done in the pre_process function */
587                            if (dbytes > rc->avg_length[s->type-1])
588                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_high / 100.0;
589                            else
590                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_low  / 100.0;
591    
592                            /* Now we must apply the assymetric tax, else our curve compression
593                             * would not give a theoritical target size equal to what it is
594                             * expected */
595                            dbytes *= rc->assymetric_tax_ratio;
596    
597                            /* Now we can add the assymetric delta */
598                            dbytes += assymetric_delta;
599                    }
600            }
601    
602          scaler = (double)target / (double)pass1_length;          /* That is what we would like to have -- Don't put that chunk after
603             * overflow control, otherwise, overflow is counted twice and you obtain
604             * half sized bitrate sequences */
605            s->desired_length  = (int)dbytes;
606            rc->desired_total += dbytes;
607    
608          if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {          /*------------------------------------------------------------------------
609                  DPRINTF(XVID_DEBUG_RC, "undersize warning\n");           * Frame bit allocation: overflow control part.
610          scaler = 1.0;           *
611          }           * Unlike the theoritical scaled_curve_apply_advanced_parameters, here
612             * it's real encoding and we need to make sure we don't go so far from
613             * what is our ideal scaled curve.
614             *-----------------------------------------------------------------------*/
615    
616            /* Compute the overflow we should compensate */
617            if (s->type != XVID_TYPE_IVOP || rc->overflow > 0) {
618                    double frametype_factor;
619                    double framesize_factor;
620    
621      DPRINTF(XVID_DEBUG_RC, "target=%i, tot_length=%i, scaler=%f\n", (int)target, (int)pass1_length, scaler);                  /* Take only the desired part of overflow */
622                    overflow = rc->overflow;
623    
624          for (i=0; i<rc->num_frames; i++) {                  /* Factor that will take care to decrease the overflow applied
625                  stat_t * s = &rc->stats[i];                   * according to the importance of this frame type in term of
626                  int len;                   * overall size */
627                    frametype_factor  = rc->count[XVID_TYPE_IVOP-1]*rc->avg_length[XVID_TYPE_IVOP-1];
628                    frametype_factor += rc->count[XVID_TYPE_PVOP-1]*rc->avg_length[XVID_TYPE_PVOP-1];
629                    frametype_factor += rc->count[XVID_TYPE_BVOP-1]*rc->avg_length[XVID_TYPE_BVOP-1];
630                    frametype_factor /= rc->count[s->type-1]*rc->avg_length[s->type-1];
631                    frametype_factor  = 1/frametype_factor;
632    
633                    /* Factor that will take care not to compensate too much for this frame
634                     * size */
635                    framesize_factor  = dbytes;
636                    framesize_factor /= rc->avg_length[s->type-1];
637    
638          if (s->zone_mode == XVID_ZONE_QUANT) {                  /* Treat only the overflow part concerned by this frame type and size */
639              s->scaled_length = s->length;                  overflow *= frametype_factor;
640          }else {  #if 0
641                      len = (int)((double)s->length * scaler * s->weight / rc->avg_weight);                  /* Leave this one alone, as it impacts badly on quality */
642                      if (len < min_size[s->type-1]) {            /* force frame size */                  overflow *= framesize_factor;
643                              s->scaled_length = min_size[s->type-1];  #endif
                             target -= s->scaled_length;  
                             pass1_length -= s->length;  
                     }else{  
                             s->scaled_length = 0;  
                     }  
         }  
         }  
644    
645      scaler = (double)target / (double)pass1_length;                  /* Apply the overflow strength imposed by the user */
646      if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {                  overflow *= (rc->param.overflow_control_strength/100.0f);
647                  DPRINTF(XVID_DEBUG_RC,"undersize warning\n");          } else {
648                  scaler = 1.0;                  /* no negative overflow applied in IFrames because:
649                     *  - their role is important as they're references for P/BFrames.
650                     *  - there aren't much in typical sequences, so if an IFrame overflows too
651                     *    much, this overflow may impact the next IFrame too much and generate
652                     *    a sequence of poor quality frames */
653                    overflow = 0;
654          }          }
655    
656          DPRINTF(XVID_DEBUG_RC, "target=%i, tot_length=%i, scaler=%f\n", (int)target, (int)pass1_length, scaler);          /* Make sure we are not trying to compensate more overflow than we even have */
657            if (fabs(overflow) > fabs(rc->overflow))
658          for (i=0; i<rc->num_frames; i++) {                  overflow = rc->overflow;
                 stat_t * s = &rc->stats[i];  
659    
660                  if (s->scaled_length==0) {      /* ignore frame with forced frame sizes */          /* Make sure the overflow doesn't make the frame size to get out of the range
661                          s->scaled_length = (int)((double)s->length * scaler * s->weight / rc->avg_weight);           * [-max_degradation..+max_improvment] */
662                  }          if (overflow > dbytes*rc->param.max_overflow_improvement / 100) {
663          }                  if(overflow <= dbytes)
664                            dbytes += dbytes * rc->param.max_overflow_improvement / 100;
665                    else
666                            dbytes += overflow * rc->param.max_overflow_improvement / 100;
667            } else if (overflow < - dbytes * rc->param.max_overflow_degradation / 100) {
668                    dbytes -= dbytes * rc->param.max_overflow_degradation / 100;
669            } else {
670                    dbytes += overflow;
671  }  }
672    
673            /*-------------------------------------------------------------------------
674             * Frame bit allocation last part:
675             *
676             * Cap frame length so we don't reach neither bigger frame sizes than first
677             * pass nor smaller than the allowed minimum.
678             *-----------------------------------------------------------------------*/
679    
680    #ifdef PASS_SMALLER
681            if (dbytes > s->length) {
682                    dbytes = s->length;
683            }
684    #endif
685    
686            /* Prevent stupid desired sizes under logical values */
687            if (dbytes < rc->min_length[s->type-1]) {
688                    dbytes = rc->min_length[s->type-1];
689            }
690    
691            /*------------------------------------------------------------------------
692             * Desired frame length <-> quantizer mapping
693             *-----------------------------------------------------------------------*/
694    
695  void pre_process1(rc_2pass2_t * rc)  #ifdef BQUANT_PRESCALE
696  {          /* For bframes we prescale the quantizer to avoid too high quant scaling */
697      int i;          if(s->type == XVID_TYPE_BVOP) {
     double total1, total2;  
     uint64_t ivop_boost_total;  
698    
699      ivop_boost_total = 0;                  twopass_stat_t *b_ref = s;
     rc->curve_comp_error = 0;  
700    
701      for (i=0; i<3; i++) {                  /* Find the reference frame */
702          rc->tot_scaled_length[i] = 0;                  while(b_ref != &rc->stats[0] && b_ref->type == XVID_TYPE_BVOP)
703                            b_ref--;
704    
705                    /* Compute the original quant */
706                    s->quant  = 2*(100*s->quant - data->bquant_offset);
707                    s->quant += data->bquant_ratio - 1; /* to avoid rounding issues */
708                    s->quant  = s->quant/data->bquant_ratio - b_ref->quant;
709      }      }
710    #endif
711    
712      for (i=0; i<rc->num_frames; i++) {          /* Don't laugh at this very 'simple' quant<->size relationship, it
713          stat_t * s = &rc->stats[i];           * proves to be acurate enough for our algorithm */
714            scaled_quant = (double)s->quant*(double)s->length/(double)dbytes;
715    
716    #ifdef COMPENSATE_FORMULA
717            /* We know xvidcore will apply the bframe formula again, so we compensate
718             * it right now to make sure we would not apply it twice */
719            if(s->type == XVID_TYPE_BVOP) {
720    
721          rc->tot_scaled_length[s->type-1] += s->scaled_length;                  twopass_stat_t *b_ref = s;
722    
723          if (s->type == XVID_TYPE_IVOP) {                  /* Find the reference frame */
724              ivop_boost_total += s->scaled_length * rc->param.keyframe_boost / 100;                  while(b_ref != &rc->stats[0] && b_ref->type == XVID_TYPE_BVOP)
725          }                          b_ref--;
726    
727                    /* Compute the quant it would be if the core did not apply the bframe
728                     * formula */
729                    scaled_quant  = 100*scaled_quant - data->bquant_offset;
730                    scaled_quant += data->bquant_ratio - 1; /* to avoid rouding issues */
731                    scaled_quant /= data->bquant_ratio;
732      }      }
733    #endif
734    
735      rc->movie_curve = ((double)(rc->tot_scaled_length[XVID_TYPE_PVOP-1] + rc->tot_scaled_length[XVID_TYPE_BVOP-1] + ivop_boost_total) /          /* Quantizer has been scaled using floating point operations/results, we
736                                          (rc->tot_scaled_length[XVID_TYPE_PVOP-1] + rc->tot_scaled_length[XVID_TYPE_BVOP-1]));           * must cast it to integer */
737            data->quant = (int)scaled_quant;
738    
739      for(i=0; i<3; i++) {          /* Let's clip the computed quantizer, if needed */
740          if (rc->count[i] == 0 || rc->movie_curve == 0) {          if (data->quant < 1) {
741              rc->avg_length[i] = 1;                  data->quant = 1;
742            } else if (data->quant > 31) {
743                    data->quant = 31;
744          }else{          }else{
             rc->avg_length[i] = rc->tot_scaled_length[i] / rc->count[i] / rc->movie_curve;  
         }  
     }  
745    
746      /* alt curve stuff here */                  /* The frame quantizer has not been clipped, this appears to be a good
747                     * computed quantizer, do not loose quantizer decimal part that we
748                     * accumulate for later reuse when its sum represents a complete
749                     * unit. */
750                    rc->quant_error[s->type-1][data->quant] += scaled_quant - (double)data->quant;
751    
752      if (rc->param.use_alt_curve) {                  if (rc->quant_error[s->type-1][data->quant] >= 1.0) {
753          const double avg_pvop = rc->avg_length[XVID_TYPE_PVOP-1];                          rc->quant_error[s->type-1][data->quant] -= 1.0;
754          const uint64_t tot_pvop = rc->tot_length[XVID_TYPE_PVOP-1];                          data->quant++;
755          const uint64_t tot_bvop = rc->tot_length[XVID_TYPE_BVOP-1];                  } else if (rc->quant_error[s->type-1][data->quant] <= -1.0) {
756          const uint64_t tot_scaled_pvop = rc->tot_scaled_length[XVID_TYPE_PVOP-1];                          rc->quant_error[s->type-1][data->quant] += 1.0;
757          const uint64_t tot_scaled_bvop = rc->tot_scaled_length[XVID_TYPE_BVOP-1];                          data->quant--;
758                    }
759            }
760    
761                  rc->alt_curve_low = avg_pvop - avg_pvop * (double)rc->param.alt_curve_low_dist / 100.0;          /* Now we have a computed quant that is in the right quante range, with a
762                  rc->alt_curve_low_diff = avg_pvop - rc->alt_curve_low;           * possible +1 correction due to cumulated error. We can now safely clip
763                  rc->alt_curve_high = avg_pvop + avg_pvop * (double)rc->param.alt_curve_high_dist / 100.0;           * the quantizer again with user's quant ranges. "Safely" means the Rate
764                  rc->alt_curve_high_diff = rc->alt_curve_high - avg_pvop;           * Control could learn more about this quantizer, this knowledge is useful
765             * for future frames even if it this quantizer won't be really used atm,
766             * that's why we don't perform this clipping earlier. */
767            if (data->quant < data->min_quant[s->type-1]) {
768                    data->quant = data->min_quant[s->type-1];
769            } else if (data->quant > data->max_quant[s->type-1]) {
770                    data->quant = data->max_quant[s->type-1];
771            }
772    
773          if (rc->param.alt_curve_use_auto) {          if (data->quant < rc->min_quant) data->quant = rc->min_quant;
             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);  
774    
775                                  if (rc->param.alt_curve_min_rel_qual < 20)          /* To avoid big quality jumps from frame to frame, we apply a "security"
776                                          rc->param.alt_curve_min_rel_qual = 20;           * rule that makes |last_quant - new_quant| <= 2. This rule only applies
777              }else{           * to predicted frames (P and B) */
778                                  rc->param.alt_curve_min_rel_qual = 100;          if (s->type != XVID_TYPE_IVOP && rc->last_quant[s->type-1] && capped_to_max_framesize == 0) {
             }  
         }  
                 rc->alt_curve_mid_qual = (1.0 + (double)rc->param.alt_curve_min_rel_qual / 100.0) / 2.0;  
                 rc->alt_curve_qual_dev = 1.0 - rc->alt_curve_mid_qual;  
779    
780          if (rc->param.alt_curve_low_dist > 100) {                  if (data->quant > rc->last_quant[s->type-1] + 2) {
781                          switch(rc->param.alt_curve_type) {                          data->quant = rc->last_quant[s->type-1] + 2;
782              case XVID_CURVE_SINE: // Sine Curve (high aggressiveness)                          DPRINTF(XVID_DEBUG_RC,
783                                  rc->alt_curve_qual_dev *= 2.0 / (1.0 + sin(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff)));                                          "[xvid rc] -- frame %d p/b-frame quantizer prevented from rising too steeply\n",
784                                  rc->alt_curve_mid_qual = 1.0 - rc->alt_curve_qual_dev * sin(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff));                                          data->frame_num);
                                 break;  
                         case XVID_CURVE_LINEAR: // Linear (medium aggressiveness)  
                                 rc->alt_curve_qual_dev *= 2.0 / (1.0 + avg_pvop / rc->alt_curve_low_diff);  
                                 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)));  
785                          }                          }
786                    if (data->quant < rc->last_quant[s->type-1] - 2) {
787                            data->quant = rc->last_quant[s->type-1] - 2;
788                            DPRINTF(XVID_DEBUG_RC,
789                                            "[xvid rc] -- frame:%d p/b-frame quantizer prevented from falling too steeply\n",
790                                            data->frame_num);
791                  }                  }
792      }      }
     /* --- */  
793    
794            /* We don't want to pollute the RC histerisis when our computed quant has
795             * been computed from a capped frame size */
796            if (capped_to_max_framesize == 0)
797                    rc->last_quant[s->type-1] = data->quant;
798    
799      total1=total2=0;          /* Don't forget to force 1st pass frame type ;-) */
800      for (i=0; i<rc->num_frames; i++) {          data->type = s->type;
         stat_t * s = &rc->stats[i];  
801    
802          if (s->type != XVID_TYPE_IVOP) {          return 0;
803              double dbytes,dbytes2;  }
804    
805              dbytes = s->scaled_length / rc->movie_curve;  /*----------------------------------------------------------------------------
806              dbytes2 = 0; /* XXX: warning */   *--------------------------------------------------------------------------*/
             total1 += dbytes;  
             if (s->type == XVID_TYPE_BVOP)  
                 dbytes *= rc->avg_length[XVID_TYPE_PVOP-1] / rc->avg_length[XVID_TYPE_BVOP-1];  
807    
808              if (rc->param.use_alt_curve) {  static int
809                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {  rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)
810    {
811            const char frame_type[4] = { 'i', 'p', 'b', 's'};
812            twopass_stat_t * s = &rc->stats[data->frame_num];
813    
814                      if (dbytes >= rc->alt_curve_high) {          /* Insufficent stats data */
815                                                  dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev);          if (data->frame_num >= rc->num_frames)
816                      }else{                  return 0;
                                                 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_high_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_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))));  
                                                 }  
                                         }  
817    
818                  }          /* Update the quantizer counter */
819            rc->quant_count[s->type-1][data->quant]++;
820    
821            /* Update the frame type overflow */
822            if (data->type == XVID_TYPE_IVOP) {
823                    int kfdiff = 0;
824    
825              }else{                  if(rc->KF_idx != rc->num_frames -1) {
826                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                          kfdiff  = rc->keyframe_locations[rc->KF_idx+1];
827                      dbytes2=((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_high / 100.0);                          kfdiff -= rc->keyframe_locations[rc->KF_idx];
                 }else{  
                                 dbytes2 = ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_low / 100.0);  
                 }  
828              }              }
829    
830              if (s->type == XVID_TYPE_BVOP) {                  /* Flush Keyframe overflow accumulator */
831                              dbytes2 *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];                  rc->overflow += rc->KFoverflow;
832                              if (dbytes2 < rc->min_length[XVID_TYPE_BVOP-1])  
833                                      dbytes2 = rc->min_length[XVID_TYPE_BVOP-1];                  /* Store the frame overflow to the keyframe accumulator */
834                    rc->KFoverflow = s->desired_length - data->length;
835    
836                    if (kfdiff > 1) {
837                            /* Non-consecutive keyframes case:
838                             * We can then divide this total keyframe overflow into equal parts
839                             * that we will distribute into regular overflow at each frame
840                             * between the sequence bounded by two IFrames */
841                            rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);
842              }else{              }else{
843                              if (dbytes2 < rc->min_length[XVID_TYPE_PVOP-1])                          /* Consecutive keyframes case:
844                                      dbytes2 = rc->min_length[XVID_TYPE_PVOP-1];                           * Flush immediatly the keyframe overflow and reset keyframe
845              }                           * overflow */
846              total2 += dbytes2;                          rc->overflow += rc->KFoverflow;
847                            rc->KFoverflow = 0;
848                            rc->KFoverflow_partial = 0;
849          }          }
850                    rc->KF_idx++;
851            } else {
852                    /* Accumulate the frame overflow */
853                    rc->overflow += s->desired_length - data->length;
854    
855                    /* Distribute part of the keyframe overflow */
856                    rc->overflow += rc->KFoverflow_partial;
857    
858                    /* Don't forget to substract that same amount from the total keyframe
859                     * overflow */
860                    rc->KFoverflow -= rc->KFoverflow_partial;
861      }      }
862    
863      rc->curve_comp_scale = total1 / total2;          rc->overflow += (s->error = s->desired_length - data->length);
864            rc->real_total += data->length;
865    
866      if (!rc->param.use_alt_curve) {          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",
867          DPRINTF(XVID_DEBUG_RC, "middle frame size for asymmetric curve compression: %i\n",                          data->frame_num,
868              (int)(rc->avg_length[XVID_TYPE_PVOP-1] * rc->curve_comp_scale));                          frame_type[data->type-1],
869                            data->quant,
870                            s->length,
871                            s->scaled_length,
872                            s->desired_length,
873                            s->desired_length - s->error,
874                            -s->error,
875                            rc->overflow);
876    
877            return(0);
878      }      }
879    
880      if (rc->param.use_alt_curve) {  /*****************************************************************************
881          int bonus_bias = rc->param.alt_curve_bonus_bias;   * Helper functions definition
882          int oldquant = 1;   ****************************************************************************/
883    
884              if (rc->param.alt_curve_use_auto_bonus_bias)  /* Default buffer size for reading lines */
885                      bonus_bias = rc->param.alt_curve_min_rel_qual;  #define BUF_SZ   1024
886    
887              rc->alt_curve_curve_bias_bonus = (total1 - total2) * (double)bonus_bias / 100.0 / (double)(rc->num_frames /* - credits_frames */ - rc->num_keyframes);  /* Helper functions for reading/parsing the stats file */
888              rc->curve_comp_scale = ((total1 - total2) * (1.0 - (double)bonus_bias / 100.0) + total2) / total2;  static char *skipspaces(char *string);
889    static int iscomment(char *string);
890    static char *readline(FILE *f);
891    
892    /* This function counts the number of frame entries in the stats file
893     * It also counts the number of I Frames */
894    static int
895    statsfile_count_frames(rc_2pass2_t * rc, char * filename)
896    {
897            FILE * f;
898            char *line;
899            int lines;
900    
901            rc->num_frames = 0;
902            rc->num_keyframes = 0;
903    
904          /* special info for alt curve:  bias bonus and quantizer thresholds */          if ((f = fopen(filename, "rb")) == NULL)
905                    return(-1);
906    
907                  DPRINTF(XVID_DEBUG_RC, "avg scaled framesize:%i", (int)rc->avg_length[XVID_TYPE_PVOP-1]);          lines = 0;
908                  DPRINTF(XVID_DEBUG_RC, "bias bonus:%i bytes", (int)rc->alt_curve_curve_bias_bonus);          while ((line = readline(f)) != NULL) {
909    
910                  for (i=1; i <= (int)(rc->alt_curve_high*2)+1; i++) {                  char *ptr;
911              double curve_temp, dbytes;                  char type;
912              int newquant;                  int fields;
913    
914              dbytes = i;                  lines++;
915                          if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {  
916                  if (dbytes >= rc->alt_curve_high) {                  /* We skip spaces */
917                                          curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev);                  ptr = skipspaces(line);
918                  }else{  
919                                          switch(rc->param.alt_curve_type)                  /* Skip coment lines or empty lines */
920                                          {                  if(iscomment(ptr) || *ptr == '\0') {
921                                          case XVID_CURVE_SINE :                          free(line);
922                                                  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)));                          continue;
                                                 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))));  
                                         }  
923                                  }                                  }
924                          }else{  
925                  if (dbytes <= rc->alt_curve_low) {                  /* Read the stat line from buffer */
926                                          curve_temp = dbytes;                  fields = sscanf(ptr, "%c", &type);
927                  }else{  
928                                          switch(rc->param.alt_curve_type)                  /* Valid stats files have at least 7 fields */
929                                          {                  if (fields == 1) {
930                                          case XVID_CURVE_SINE :                          switch(type) {
931                                                  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)));                          case 'i':
932                                                  break;                          case 'I':
933                                          case XVID_CURVE_LINEAR :                                  rc->num_keyframes++;
934                                                  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);                          case 'p':
935                            case 'P':
936                            case 'b':
937                            case 'B':
938                            case 's':
939                            case 'S':
940                                    rc->num_frames++;
941                                                  break;                                                  break;
942                                          case XVID_CURVE_COSINE :                          default:
943                                                  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))));                                  DPRINTF(XVID_DEBUG_RC,
944                                                    "[xvid rc] -- WARNING: L%d unknown frame type used (%c).\n",
945                                                    lines, type);
946                                          }                                          }
947                    } else {
948                                    DPRINTF(XVID_DEBUG_RC,
949                                                    "[xvid rc] -- WARNING: L%d misses some stat fields (%d).\n",
950                                                    lines, 7-fields);
951                                  }                                  }
952    
953                    /* Free the line buffer */
954                    free(line);
955                          }                          }
956    
957                          if (rc->movie_curve > 1.0)          /* We are done with the file */
958                                  dbytes *= rc->movie_curve;          fclose(f);
959    
960                          newquant = (int)(dbytes * 2.0 / (curve_temp * rc->curve_comp_scale + rc->alt_curve_curve_bias_bonus));          return(0);
                         if (newquant > 1) {  
                                 if (newquant != oldquant) {  
                     int percent = (int)((i - rc->avg_length[XVID_TYPE_PVOP-1]) * 100.0 / rc->avg_length[XVID_TYPE_PVOP-1]);  
                                         oldquant = newquant;  
                                         DPRINTF(XVID_DEBUG_RC, "quant:%i threshold at %i : %i percent", newquant, i, percent);  
                                 }  
                         }  
961                  }                  }
962    
963    /* open stats file(s) and read into rc->stats array */
964    static int
965    statsfile_load(rc_2pass2_t *rc, char * filename)
966    {
967            FILE * f;
968            int processed_entries;
969    
970            /* Opens the file */
971            if ((f = fopen(filename, "rb"))==NULL)
972                    return(-1);
973    
974            processed_entries = 0;
975            while(processed_entries < rc->num_frames) {
976                    char type;
977                    int fields;
978                    twopass_stat_t * s = &rc->stats[processed_entries];
979                    char *line, *ptr;
980    
981                    /* Read the line from the file */
982                    if((line = readline(f)) == NULL)
983                            break;
984    
985                    /* We skip spaces */
986                    ptr = skipspaces(line);
987    
988                    /* Skip comment lines or empty lines */
989                    if(iscomment(ptr) || *ptr == '\0') {
990                            free(line);
991                            continue;
992      }      }
993    
994      rc->overflow = 0;                  /* Reset this field that is optional */
995      rc->KFoverflow = 0;                  s->scaled_length = 0;
996      rc->KFoverflow_partial = 0;  
997      rc->KF_idx = 1;                  /* Convert the fields */
998                    fields = sscanf(ptr,
999                                                    "%c %d %d %d %d %d %d %d\n",
1000                                                    &type,
1001                                                    &s->quant,
1002                                                    &s->blks[0], &s->blks[1], &s->blks[2],
1003                                                    &s->length, &s->invariant /* not really yet */,
1004                                                    &s->scaled_length);
1005    
1006                    /* Free line buffer, we don't need it anymore */
1007                    free(line);
1008    
1009                    /* Fail silently, this has probably been warned in
1010                     * statsfile_count_frames */
1011                    if(fields != 7 && fields != 8)
1012                            continue;
1013    
1014                    /* Convert frame type and compute the invariant length part */
1015                    switch(type) {
1016                    case 'i':
1017                    case 'I':
1018                            s->type = XVID_TYPE_IVOP;
1019                            s->invariant /= INVARIANT_HEADER_PART_IVOP;
1020                            break;
1021                    case 'p':
1022                    case 'P':
1023                    case 's':
1024                    case 'S':
1025                            s->type = XVID_TYPE_PVOP;
1026                            s->invariant /= INVARIANT_HEADER_PART_PVOP;
1027                            break;
1028                    case 'b':
1029                    case 'B':
1030                            s->type = XVID_TYPE_BVOP;
1031                            s->invariant /= INVARIANT_HEADER_PART_BVOP;
1032                            break;
1033                    default:
1034                            /* Same as before, fail silently */
1035                            continue;
1036  }  }
1037    
1038                    /* Ok it seems it's been processed correctly */
1039                    processed_entries++;
1040            }
1041    
1042            /* Close the file */
1043            fclose(f);
1044    
1045            return(0);
1046    }
1047    
1048  static int rc_2pass2_create(xvid_plg_create_t * create, rc_2pass2_t ** handle)  /* pre-process the statistics data
1049     * - for each type, count, tot_length, min_length, max_length
1050     * - set keyframes_locations, tot_prescaled */
1051    static void
1052    first_pass_stats_prepare_data(rc_2pass2_t * rc)
1053  {  {
1054      xvid_plugin_2pass2_t * param = (xvid_plugin_2pass2_t *)create->param;          int i,j;
     rc_2pass2_t * rc;  
     int i;  
1055    
1056      rc = malloc(sizeof(rc_2pass2_t));          /* *rc fields initialization
1057      if (rc == NULL)           * NB: INT_MAX and INT_MIN are used in order to be immediately replaced
1058          return XVID_ERR_MEMORY;           *     with real values of the 1pass */
1059            for (i=0; i<3; i++) {
1060                    rc->count[i]=0;
1061                    rc->tot_length[i] = 0;
1062                    rc->tot_invariant[i] = 0;
1063                    rc->min_length[i] = INT_MAX;
1064            }
1065    
1066      rc->param = *param;          rc->max_length = INT_MIN;
1067            rc->tot_weighted = 0;
1068    
1069      if (rc->param.keyframe_boost <= 0) rc->param.keyframe_boost = 0;          /* Loop through all frames and find/compute all the stuff this function
1070      if (rc->param.payback_method <= 0) rc->param.payback_method = XVID_PAYBACK_PROP;           * is supposed to do */
1071      if (rc->param.bitrate_payback_delay <= 0) rc->param.bitrate_payback_delay = 250;          for (i=j=0; i<rc->num_frames; i++) {
1072      if (rc->param.curve_compression_high <= 0) rc->param.curve_compression_high = 0;                  twopass_stat_t * s = &rc->stats[i];
     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;  
1073    
1074      if (!det_stats_length(rc, param->filename)){                  rc->count[s->type-1]++;
1075          DPRINTF(XVID_DEBUG_RC,"fopen %s failed\n", param->filename);                  rc->tot_length[s->type-1] += s->length;
1076          free(rc);                  rc->tot_invariant[s->type-1] += s->invariant;
1077          return XVID_ERR_FAIL;                  if (s->zone_mode != XVID_ZONE_QUANT)
1078                            rc->tot_weighted += (int)(s->weight*(s->length - s->invariant));
1079    
1080                    if (s->length < rc->min_length[s->type-1]) {
1081                            rc->min_length[s->type-1] = s->length;
1082      }      }
1083    
1084      if ((rc->stats = malloc(rc->num_frames * sizeof(stat_t))) == NULL) {                  if (s->length > rc->max_length) {
1085          free(rc);                          rc->max_length = s->length;
         return XVID_ERR_MEMORY;  
1086      }      }
1087    
1088      /*                  if (s->type == XVID_TYPE_IVOP) {
1089           * We need an extra location because we do as if the last frame were an                          rc->keyframe_locations[j] = i;
1090           * IFrame. This is needed because our code consider that frames between                          j++;
1091           * 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;  
1092      }      }
1093    
1094      if (!load_stats(rc, param->filename)) {          /* NB:
1095          DPRINTF(XVID_DEBUG_RC,"fopen %s failed\n", param->filename);           * The "per sequence" overflow system considers a natural sequence to be
1096          free(rc->keyframe_locations);           * formed by all frames between two iframes, so if we want to make sure
1097          free(rc->stats);           * the system does not go nuts during last sequence, we force the last
1098          free(rc);           * frame to appear in the keyframe locations array. */
1099          return XVID_ERR_FAIL;          rc->keyframe_locations[j] = i;
1100    
1101            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Min 1st pass IFrame length: %d\n", rc->min_length[0]);
1102            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Min 1st pass PFrame length: %d\n", rc->min_length[1]);
1103            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Min 1st pass BFrame length: %d\n", rc->min_length[2]);
1104      }      }
1105    
1106      /* pre-process our stats */  /* calculate zone weight "center" */
1107    static void
1108    zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)
1109    {
1110            int i,j;
1111            int n = 0;
1112    
1113          if (rc->num_frames  < create->fbase/create->fincr) {          rc->tot_quant = 0;
1114                  rc->target = rc->param.bitrate / 8;     /* one second */          rc->tot_quant_invariant = 0;
1115          }else{  
1116                  rc->target = (rc->param.bitrate * rc->num_frames * create->fincr) / (create->fbase * 8);          if (create->num_zones == 0) {
1117                    for (j = 0; j < rc->num_frames; j++) {
1118                            rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1119                            rc->stats[j].weight = 1.0;
1120                    }
1121                    n += rc->num_frames;
1122          }          }
1123    
     DPRINTF(XVID_DEBUG_RC, "rc->target : %i\n", rc->target);  
1124    
1125  #if 0          for(i=0; i < create->num_zones; i++) {
         rc->target -= rc->num_frames*24;        /* avi file header */  
 #endif  
1126    
1127                    int next = (i+1<create->num_zones) ? create->zones[i+1].frame : rc->num_frames;
1128    
1129          pre_process0(rc);                  /* Zero weight make no sense */
1130                    if (create->zones[i].increment == 0) create->zones[i].increment = 1;
1131                    /* And obviously an undetermined infinite makes even less sense */
1132                    if (create->zones[i].base == 0) create->zones[i].base = 1;
1133    
1134          if (rc->param.bitrate) {                  if (i==0 && create->zones[i].frame > 0) {
1135          zone_process(rc, create);                          for (j = 0; j < create->zones[i].frame && j < rc->num_frames; j++) {
1136                  internal_scale(rc);                                  rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1137      }else{                                  rc->stats[j].weight = 1.0;
         /* 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;  
1138          }          }
1139          rc->avg_weight = 1.0;                          n += create->zones[i].frame;
         rc->tot_quant = 0;  
1140      }      }
         pre_process1(rc);  
1141    
1142      for (i=0; i<32;i++) {                  if (create->zones[i].mode == XVID_ZONE_WEIGHT) {
1143          rc->pquant_error[i] = 0;                          for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {
1144          rc->bquant_error[i] = 0;                                  rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1145          rc->quant_count[i] = 0;                                  rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;
1146                            }
1147                            next -= create->zones[i].frame;
1148                            n += next;
1149                    } else{  /* XVID_ZONE_QUANT */
1150                            for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {
1151                                    rc->stats[j].zone_mode = XVID_ZONE_QUANT;
1152                                    rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;
1153                                    rc->tot_quant += rc->stats[j].length;
1154                                    rc->tot_quant_invariant += rc->stats[j].invariant;
1155                            }
1156                    }
1157      }      }
   
     rc->fq_error = 0;  
   
     *handle = rc;  
         return(0);  
1158  }  }
1159    
1160    
1161  static int rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy)  /* scale the curve */
1162    static void
1163    first_pass_scale_curve_internal(rc_2pass2_t *rc)
1164  {  {
1165      free(rc->keyframe_locations);          int64_t target;
1166      free(rc->stats);          int64_t total_invariant;
1167          free(rc);          double scaler;
1168          return(0);          int i, num_MBs;
1169    
1170            /* We only scale texture data ! */
1171            total_invariant  = rc->tot_invariant[XVID_TYPE_IVOP-1];
1172            total_invariant += rc->tot_invariant[XVID_TYPE_PVOP-1];
1173            total_invariant += rc->tot_invariant[XVID_TYPE_BVOP-1];
1174            /* don't forget to substract header bytes used in quant zones, otherwise we
1175             * counting them twice */
1176            total_invariant -= rc->tot_quant_invariant;
1177    
1178            /* We remove the bytes used by the fixed quantizer zones during first pass
1179             * with the same quants, so we know very precisely how much that
1180             * represents */
1181            target  = rc->target;
1182            target -= rc->tot_quant;
1183    
1184            /* Let's compute a linear scaler in order to perform curve scaling */
1185            scaler = (double)(target - total_invariant) / (double)(rc->tot_weighted);
1186    
1187    #ifdef SMART_OVERFLOW_SETTING
1188            if (scaler > 0.9) {
1189                    rc->param.max_overflow_degradation *= 5;
1190                    rc->param.max_overflow_improvement *= 5;
1191                    rc->param.overflow_control_strength *= 3;
1192            } else if (scaler > 0.6) {
1193                    rc->param.max_overflow_degradation *= 2;
1194                    rc->param.max_overflow_improvement *= 2;
1195                    rc->param.overflow_control_strength *= 2;
1196            } else {
1197                    rc->min_quant = 2;
1198  }  }
1199    #endif
1200    
1201            /* Compute min frame lengths (for each frame type) according to the number
1202             * of MBs. We sum all block type counters of frame 0, this gives us the
1203             * number of MBs.
1204             *
1205             * We compare these hardcoded values with observed values in first pass
1206             * (determined in pre_process0).Then we keep the real minimum. */
1207    
1208            /* Number of MBs */
1209            num_MBs  = rc->stats[0].blks[0];
1210            num_MBs += rc->stats[0].blks[1];
1211            num_MBs += rc->stats[0].blks[2];
1212    
1213            /* Minimum for I frames */
1214            if(rc->min_length[XVID_TYPE_IVOP-1] > ((num_MBs*22) + 240) / 8)
1215                    rc->min_length[XVID_TYPE_IVOP-1] = ((num_MBs*22) + 240) / 8;
1216    
1217            /* Minimum for P/S frames */
1218            if(rc->min_length[XVID_TYPE_PVOP-1] > ((num_MBs) + 88)  / 8)
1219                    rc->min_length[XVID_TYPE_PVOP-1] = ((num_MBs) + 88)  / 8;
1220    
1221            /* Minimum for B frames */
1222            if(rc->min_length[XVID_TYPE_BVOP-1] > 8)
1223                    rc->min_length[XVID_TYPE_BVOP-1] = 8;
1224    
1225  static int rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)          /* Perform an initial scale pass.
1226  {           *
1227      stat_t * s = &rc->stats[data->frame_num];           * If a frame size is scaled underneath our hardcoded minimums, then we
1228      int overflow;           * force the frame size to the minimum, and deduct the original & scaled
1229      int desired;           * frame length from the original and target total lengths */
1230      double dbytes;          for (i=0; i<rc->num_frames; i++) {
1231      double curve_temp;                  twopass_stat_t * s = &rc->stats[i];
1232      int capped_to_max_framesize = 0;                  int len;
1233    
1234          /*                  /* No need to scale frame length for which a specific quantizer is
1235           * This function is quite long but easy to understand. In order to simplify                   * specified thanks to zones */
1236           * the code path (a bit), we treat 3 cases that can return immediatly.                  if (s->zone_mode == XVID_ZONE_QUANT) {
1237           */                          s->scaled_length = s->length;
1238                            continue;
1239                    }
1240    
1241          /* First case: Another plugin has already set a quantizer */                  /* Compute the scaled length -- only non invariant data length is scaled */
1242      if (data->quant > 0)                  len = s->invariant + (int)((double)(s->length-s->invariant) * scaler * s->weight);
                 return(0);  
1243    
1244          /* Second case: We are in a Quant zone */                  /* Compare with the computed minimum */
1245          if (s->zone_mode == XVID_ZONE_QUANT) {                  if (len < rc->min_length[s->type-1]) {
1246                            /* This is a 'forced size' frame, set its frame size to the
1247                             * computed minimum */
1248                            s->scaled_length = rc->min_length[s->type-1];
1249    
1250                  rc->fq_error += s->weight;                          /* Remove both scaled and original size from their respective
1251                  data->quant = (int)rc->fq_error;                           * total counters, as we prepare a second pass for 'regular'
1252                  rc->fq_error -= data->quant;                           * frames */
1253                            target -= s->scaled_length;
1254                    } else {
1255                            /* Do nothing for now, we'll scale this later */
1256                            s->scaled_length = 0;
1257                    }
1258            }
1259    
1260                  s->desired_length = s->length;          /* The first pass on data substracted all 'forced size' frames from the
1261             * total counters. Now, it's possible to scale the 'regular' frames. */
1262    
1263                  return(0);          /* Scaling factor for 'regular' frames */
1264            scaler = (double)(target - total_invariant) / (double)(rc->tot_weighted);
1265    
1266            /* Do another pass with the new scaler */
1267            for (i=0; i<rc->num_frames; i++) {
1268                    twopass_stat_t * s = &rc->stats[i];
1269    
1270                    /* Ignore frame with forced frame sizes */
1271                    if (s->scaled_length == 0)
1272                            s->scaled_length = s->invariant + (int)((double)(s->length-s->invariant) * scaler * s->weight);
1273          }          }
1274    
1275          /* Third case: insufficent stats data */          /* Job done */
1276          if (data->frame_num >= rc->num_frames)          return;
1277                  return 0;  }
1278    
1279          /*  /* Apply all user settings to the scaled curve
1280           * The last case is the one every normal minded developer should fear to   * This implies:
1281           * maintain in a project :-)   *   keyframe boosting
1282           */   *   high/low compression */
1283    static void
1284    scaled_curve_apply_advanced_parameters(rc_2pass2_t * rc)
1285    {
1286            int i;
1287            int64_t ivop_boost_total;
1288    
1289          /* XXX: why by 8 */          /* Reset the rate controller (per frame type) total byte counters */
1290          overflow = rc->overflow / 8;          for (i=0; i<3; i++) rc->tot_scaled_length[i] = 0;
1291    
1292          /*          /* Compute total bytes for each frame type */
1293           * The rc->overflow field represents the overflow in current scene (between two          for (i=0; i<rc->num_frames;i++) {
1294           * IFrames) so we must not forget to reset it if we are enetring a new scene                  twopass_stat_t *s = &rc->stats[i];
1295           */                  rc->tot_scaled_length[s->type-1] += s->scaled_length;
         if (s->type == XVID_TYPE_IVOP) {  
                 overflow = 0;  
1296          }          }
1297    
1298          desired = s->scaled_length;          /* First we compute the total amount of bits needed, as being described by
1299             * the scaled distribution. During this pass over the complete stats data,
1300             * we see how much bits two user settings will get/give from/to p&b frames:
1301             *  - keyframe boosting
1302             *  - keyframe distance penalty */
1303            rc->KF_idx = 0;
1304            ivop_boost_total = 0;
1305            for (i=0; i<rc->num_frames; i++) {
1306                    twopass_stat_t * s = &rc->stats[i];
1307    
1308          dbytes = desired;                  /* Some more work is needed for I frames */
1309          if (s->type == XVID_TYPE_IVOP) {          if (s->type == XVID_TYPE_IVOP) {
1310                  dbytes += desired * rc->param.keyframe_boost / 100;                          int ivop_boost;
         }  
         dbytes /= rc->movie_curve;  
1311    
1312          /*                          /* Accumulate bytes needed for keyframe boosting */
1313           * 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];  
         }  
1314    
1315          /*  #if 0 /* ToDo: decide how to apply kfthresholding */
1316           * Apply user's choosen Payback method. Payback helps bitrate to follow the  #endif
1317           * scaled curve "paying back" past errors in curve previsions.                          /* If the frame size drops under the minimum length, then cap ivop_boost */
1318           */                          if (ivop_boost + s->scaled_length < rc->min_length[XVID_TYPE_IVOP-1])
1319          if (rc->param.payback_method == XVID_PAYBACK_BIAS) {                                  ivop_boost = rc->min_length[XVID_TYPE_IVOP-1] - s->scaled_length;
                 desired =(int)(rc->curve_comp_error / rc->param.bitrate_payback_delay);  
         }else{  
                 desired = (int)(rc->curve_comp_error * dbytes /  
                                                 rc->avg_length[XVID_TYPE_PVOP-1] / rc->param.bitrate_payback_delay);  
1320    
1321                  if (labs(desired) > fabs(rc->curve_comp_error)) {                          /* Accumulate the ivop boost */
1322                          desired = (int)rc->curve_comp_error;                          ivop_boost_total += ivop_boost;
1323    
1324                            /* Don't forget to update the keyframe index */
1325                            rc->KF_idx++;
1326                  }                  }
1327          }          }
1328    
1329          rc->curve_comp_error -= desired;          /* Initialize the IBoost tax ratio for P/S/B frames
1330             *
1331             * This ratio has to be applied to p/b/s frames in order to reserve
1332             * additional bits for keyframes (keyframe boosting) or if too much
1333             * keyframe distance is applied, bits retrieved from the keyframes.
1334             *
1335             * ie pb_length *= rc->pb_iboost_tax_ratio;
1336             *
1337             *    gives the ideal length of a p/b frame */
1338    
1339          /*          /* Compute the total length of p/b/s frames (temporary storage into
1340           * Alt curve treatment is not that hard to understand though the formulas           * movie_curve) */
1341           * 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];
1342           * curve flux applying sine/linear/cosine ratios          rc->pb_iboost_tax_ratio += (double)rc->tot_scaled_length[XVID_TYPE_BVOP-1];
1343           */  
1344            /* Compute the ratio described above
1345             *     taxed_total = sum(0, n, tax*scaled_length)
1346             * <=> taxed_total = tax.sum(0, n, scaled_length)
1347             * <=> tax = taxed_total / original_total */
1348            rc->pb_iboost_tax_ratio =
1349                    (rc->pb_iboost_tax_ratio - ivop_boost_total) /
1350                    rc->pb_iboost_tax_ratio;
1351    
1352          /* XXX: warning */          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- IFrame boost tax ratio:%.2f\n",
1353          curve_temp = 0;                          rc->pb_iboost_tax_ratio);
1354    
1355          if (rc->param.use_alt_curve) {          /* Compute the average size of frames per frame type */
1356                  if (s->type != XVID_TYPE_IVOP)  {          for(i=0; i<3; i++) {
1357                          if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                  /* Special case for missing type or weird case */
1358                                  if (dbytes >= rc->alt_curve_high) {                  if (rc->count[i] == 0 || rc->pb_iboost_tax_ratio == 0) {
1359                                          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))));  
                                         }  
                                 }  
1360                          } else {                          } else {
1361                                  if (dbytes <= rc->alt_curve_low){                          rc->avg_length[i] = rc->tot_scaled_length[i];
1362                                          curve_temp = dbytes;  
1363                            if (i == (XVID_TYPE_IVOP-1)) {
1364                                    /* I Frames total has to be added the boost total */
1365                                    rc->avg_length[i] += ivop_boost_total;
1366                                  } else {                                  } else {
1367                                          switch(rc->param.alt_curve_type) {                                  /* P/B frames has to taxed */
1368                                          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))));  
1369                                          }                                          }
1370    
1371                            /* Finally compute the average frame size */
1372                            rc->avg_length[i] /= (double)rc->count[i];
1373                                  }                                  }
1374                          }                          }
1375    
1376                          /*          /* Assymetric curve compression */
1377                           * End of code path for curve_temp, as told earlier, we are now          if (rc->param.curve_compression_high || rc->param.curve_compression_low) {
1378                           * obliged to scale the value to a bframe one using the inverse                  double symetric_total;
1379                           * ratio applied earlier                  double assymetric_delta_total;
1380                           */  
1381                          if (s->type == XVID_TYPE_BVOP)                  /* Like I frame boosting, assymetric curve compression modifies the total
1382                                  curve_temp *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];                   * amount of needed bits, we must compute the ratio so we can prescale
1383                     lengths */
1384                    symetric_total = 0;
1385                    assymetric_delta_total = 0;
1386                    for (i=0; i<rc->num_frames; i++) {
1387                            double assymetric_delta;
1388                            double dbytes;
1389                            twopass_stat_t * s = &rc->stats[i];
1390    
1391                          curve_temp = curve_temp * rc->curve_comp_scale + rc->alt_curve_curve_bias_bonus;                          /* I Frames are not concerned by assymetric scaling */
1392                            if (s->type == XVID_TYPE_IVOP)
1393                                    continue;
1394    
1395                          desired += ((int)curve_temp);                          /* During the real run, we would have to apply the iboost tax */
1396                          rc->curve_comp_error += curve_temp - (int)curve_temp;                          dbytes = s->scaled_length * rc->pb_iboost_tax_ratio;
                 } else {  
                         /*  
                          * 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];  
1397    
1398                          desired += ((int)dbytes);                          /* Update the symmetric curve compression total */
1399                          rc->curve_comp_error += dbytes - (int)dbytes;                          symetric_total += dbytes;
1400                  }  
1401                            /* Apply assymetric curve compression */
1402                            if (dbytes > rc->avg_length[s->type-1])
1403                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * (double)rc->param.curve_compression_high / 100.0f;
1404                            else
1405                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * (double)rc->param.curve_compression_low  / 100.0f;
1406    
1407          } else if ((rc->param.curve_compression_high + rc->param.curve_compression_low) &&      s->type != XVID_TYPE_IVOP) {                          /* Cap to the minimum frame size if needed */
1408                            if (dbytes + assymetric_delta < rc->min_length[s->type-1])
1409                                    assymetric_delta = rc->min_length[s->type-1] - dbytes;
1410    
1411                  curve_temp = rc->curve_comp_scale;                          /* Accumulate after assymetric curve compression */
1412                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                          assymetric_delta_total += assymetric_delta;
1413                          curve_temp *= ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_high / 100.0);                  }
1414    
1415                    /* Compute the tax that all p/b frames have to pay in order to respect the
1416                     * bit distribution changes that the assymetric compression curve imposes
1417                     * We want assymetric_total = sum(0, n-1, tax.scaled_length)
1418                     *      ie assymetric_total = ratio.sum(0, n-1, scaled_length)
1419                     *         ratio = assymetric_total / symmetric_total */
1420                    rc->assymetric_tax_ratio = ((double)symetric_total - (double)assymetric_delta_total) / (double)symetric_total;
1421                  } else {                  } else {
1422                          curve_temp *= ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_low / 100.0);                  rc->assymetric_tax_ratio = 1.0f;
1423                  }                  }
1424    
1425                  /*          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Assymetric tax ratio:%.2f\n", rc->assymetric_tax_ratio);
                  * End of code path for curve_temp, 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)  
                         curve_temp *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
1426    
1427                  desired += (int)curve_temp;          /* Last bits that need to be reset */
1428                  rc->curve_comp_error += curve_temp - (int)curve_temp;          rc->overflow = 0;
1429          } else {          rc->KFoverflow = 0;
1430                  /*          rc->KFoverflow_partial = 0;
1431                   * End of code path for dbytes, as told earlier, we are now          rc->KF_idx = 0;
1432                   * obliged to scale the value to a bframe one using the inverse          rc->desired_total = 0;
1433                   * ratio applied earlier          rc->real_total = 0;
1434    
1435            /* Job done */
1436            return;
1437    }
1438    
1439    /*****************************************************************************
1440     * VBV compliancy check and scale
1441     * MPEG-4 standard specifies certain restrictions for bitrate/framesize in VBR
1442     * to enable playback on devices with limited readspeed and memory (and which
1443     * aren't...)
1444     *
1445     * DivX profiles have 2 criteria: VBV as in MPEG standard
1446     *                                a limit on peak bitrate for any 3 seconds
1447     *
1448     * But if VBV is fulfilled, peakrate is automatically fulfilled in any profile
1449     * define so far, so we check for it (for completeness) but correct only VBV
1450     *
1451     *****************************************************************************/
1452    
1453    #define VBV_COMPLIANT 0
1454    #define VBV_UNDERFLOW 1 /* video buffer runs empty */
1455    #define VBV_OVERFLOW 2  /* doesn't exist for VBR encoding */
1456    #define VBV_PEAKRATE 4  /* peak bitrate (within 3s) violated */
1457    
1458    static int check_curve_for_vbv_compliancy(rc_2pass2_t * rc, const float fps)
1459    {
1460    /* We do all calculations in float, for higher accuracy,
1461       and in bytes for convenience
1462    
1463       typical values from DivX Home Theater profile:
1464       vbv_size= 384*1024 (384kB), vbv_initial= 288*1024 (75% fill)
1465       maxrate= 4000000 (4MBps), peakrate= 10000000 (10MBps)
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                   */                   */
1470                  if (s->type == XVID_TYPE_BVOP){  
1471                          dbytes *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];    const float vbv_size = (float)rc->param.vbv_size/8.f;
1472      float vbvfill = (float)rc->param.vbv_initial/8.f;
1473    
1474      const float maxrate = (float)rc->param.vbv_maxrate;
1475      const float peakrate = (float)rc->param.vbv_peakrate;
1476      const float r0 = (int)(maxrate/fps+0.5)/8.f;
1477    
1478      int bytes3s = 0;
1479      int offset3s = (int)(3.f*fps+0.5);
1480    
1481      int i;
1482      for (i=0; i<rc->num_frames; i++) {
1483    /* DivX 3s peak bitrate check  */
1484    
1485        bytes3s += rc->stats[i].scaled_length;
1486        if (i>=offset3s)
1487          bytes3s -= rc->stats[i-offset3s].scaled_length;
1488    
1489        if (8.f*bytes3s > 3*peakrate)
1490          return VBV_PEAKRATE;
1491    
1492    /* update vbv fill level */
1493    
1494        vbvfill += r0 - rc->stats[i].scaled_length;
1495    
1496    /* this check is _NOT_ an "overflow"! only reading from disk stops then */
1497        if (vbvfill > vbv_size)
1498          vbvfill = vbv_size;
1499    
1500    /* but THIS would be an underflow. report it! */
1501        if (vbvfill < 0)
1502          return VBV_UNDERFLOW;
1503                  }                  }
1504    
1505                  desired += (int)dbytes;    return VBV_COMPLIANT;
                 rc->curve_comp_error += dbytes - (int)dbytes;  
1506          }          }
1507    /* TODO: store min(vbvfill) and print "minimum buffer fill" */
1508    
1509    
1510    static int scale_curve_for_vbv_compliancy(rc_2pass2_t * rc, const float fps)
1511    {
1512    /* correct any VBV violations. Peak bitrate violations disappears
1513       by this automatically
1514    
1515       This implementation follows
1516    
1517       Westerink, Rajagopalan, Gonzales "Two-pass MPEG-2 variable-bitrate encoding"
1518       IBM J. RES. DEVELOP. VOL 43, No. 4, July 1999, p.471--488
1519    
1520       Thanks, guys! This paper rocks!!!
1521    */
1522    
1523          /*          /*
1524           * We can't do bigger frames than first pass, this would be stupid as first      For each scene of len N, we have to check up to N^2 possible buffer fills.
1525           * pass is quant=2 and that reaching quant=1 is not worth it. We would lose      This works well with MPEG-2 where N==12 or so, but for MPEG-4 it's a
1526           * many bytes and we would not not gain much quality.      little slow...
1527    
1528        TODO: Better control on VBVfill between scenes
1529           */           */
1530          if (desired > s->length) {  
1531                  rc->curve_comp_error += desired - s->length;    const float vbv_size = (float)rc->param.vbv_size/8.f;
1532                  desired = s->length;    const float vbv_initial = (float)rc->param.vbv_initial/8.f;
1533          }else{  
1534                  if (desired < rc->min_length[s->type-1]) {    const float maxrate = 0.9*rc->param.vbv_maxrate;
1535                          if (s->type == XVID_TYPE_IVOP){    const float vbv_low = 0.10f*vbv_size;
1536                                  rc->curve_comp_error -= rc->min_length[XVID_TYPE_IVOP-1] - desired;    const float r0 = (int)(maxrate/fps+0.5)/8.f;
1537    
1538      int i,k,l,n,violation = 0;
1539      float *scenefactor;
1540      int *scenestart;
1541      int *scenelength;
1542    
1543    /* first step: determine how many "scenes" there are and store their boundaries
1544       we could get all this from existing keyframe_positions, somehow, but there we
1545       don't have a min_scenelength, and it's no big deal to get it again.  */
1546    
1547      const int min_scenelength = (int)(fps+0.5);
1548      int num_scenes = 0;
1549      int last_scene = -999;
1550      for (i=0; i<rc->num_frames; i++) {
1551        if ( (rc->stats[i].type == XVID_TYPE_IVOP) && (i-last_scene>min_scenelength) )
1552        {
1553          last_scene = i;
1554          num_scenes++;
1555                          }                          }
                         desired = rc->min_length[s->type-1];  
1556                  }                  }
1557    
1558      scenefactor = (float*)malloc( num_scenes*sizeof(float) );
1559      scenestart = (int*)malloc( num_scenes*sizeof(int) );
1560      scenelength = (int*)malloc( num_scenes*sizeof(int) );
1561    
1562      if ((!scenefactor) || (!scenestart) || (!scenelength) )
1563      {
1564        free(scenefactor);
1565        free(scenestart);
1566        free(scenelength);
1567        /* remember: free(0) is valid and does exactly nothing. */
1568        return -1;
1569          }          }
1570    
1571          s->desired_length = desired;  /* count again and safe the length/position */
1572    
1573      num_scenes = 0;
1574      last_scene = -999;
1575      for (i=0; i<rc->num_frames; i++) {
1576        if ( (rc->stats[i].type == XVID_TYPE_IVOP) && (i-last_scene>min_scenelength) )
1577        {
1578          if (num_scenes>0)
1579            scenelength[num_scenes-1]=i-last_scene;
1580          scenestart[num_scenes]=i;
1581          num_scenes++;
1582          last_scene = i;
1583        }
1584      }
1585      scenelength[num_scenes-1]=i-last_scene;
1586    
1587          /* if this keyframe is too close to the next, reduce it's byte allotment  /* second step: check for each scene, how much we can scale its frames up or down
1588             XXX: why do we do this after setting the desired length  */     such that the VBV restriction is just fulfilled
1589    */
1590    
         if (s->type == XVID_TYPE_IVOP) {  
                 int KFdistance = rc->keyframe_locations[rc->KF_idx] - rc->keyframe_locations[rc->KF_idx - 1];  
1591    
1592                  if (KFdistance < rc->param.kftreshold) {  #define R(k,n) (((n)+1-(k))*r0)     /* how much enters the buffer between frame k and n */
1593      for (l=0; l<num_scenes;l++)
1594      {
1595        const int start = scenestart[l];
1596        const int length = scenelength[l];
1597        twopass_stat_t * frames = &rc->stats[start];
1598    
1599                          KFdistance = KFdistance - rc->param.min_key_interval;      float S0n,Skn;
1600        float f,minf = 99999.f;
1601    
1602                          if (KFdistance >= 0) {      S0n=0.;
1603                                  int KF_min_size;      for (n=0;n<=length-1;n++)
1604        {
1605          S0n += frames[n].scaled_length;
1606    
1607                                  KF_min_size = desired * (100 - rc->param.kfreduction) / 100;        k=0;
1608                                  if (KF_min_size < 1)        Skn = S0n;
1609                                          KF_min_size = 1;        f = (R(k,n-1) + (vbv_initial - vbv_low)) / Skn;
1610          if (f < minf)
1611            minf = f;
1612    
1613                                  desired = KF_min_size + (desired - KF_min_size) * KFdistance /        for (k=1;k<=n;k++)
1614                                          (rc->param.kftreshold - rc->param.min_key_interval);        {
1615            Skn -= frames[k].scaled_length;
1616    
1617                                  if (desired < 1)          f = (R(k,n-1) + (vbv_size - vbv_low)) / Skn;
1618                                          desired = 1;          if (f < minf)
1619                          }            minf = f;
1620                  }                  }
1621          }          }
1622    
1623          overflow = (int)((double)overflow * desired / rc->avg_length[XVID_TYPE_PVOP-1]);      /* special case: at the end, fill buffer up to vbv_initial again
1624           TODO: Allow other values for buffer fill between scenes
1625           e.g. if n=N is smallest f-value, then check for better value */
1626    
1627          /* Reign in overflow with huge frames */      n=length;
1628          if (labs(overflow) > labs(rc->overflow)) {      k=0;
1629                  overflow = rc->overflow;      Skn = S0n;
1630          }      f = R(k,n-1)/Skn;
1631        if (f < minf)
1632          minf = f;
1633    
1634          /* Make sure overflow doesn't run away */      for (k=1;k<=n-1;k++)
1635          if (overflow > desired * rc->param.max_overflow_improvement / 100) {      {
1636                  desired += (overflow <= desired) ? desired * rc->param.max_overflow_improvement / 100 :        Skn -= frames[k].scaled_length;
1637                          overflow * rc->param.max_overflow_improvement / 100;  
1638          } else if (overflow < desired * rc->param.max_overflow_degradation / -100){        f = (R(k,n-1) + (vbv_initial - vbv_low)) / Skn;
1639                  desired += desired * rc->param.max_overflow_degradation / -100;        if (f < minf)
1640          } else {          minf = f;
                 desired += overflow;  
1641          }          }
1642    
1643          /* Make sure we are not higher than desired frame size */  #ifdef VBV_DEBUG
1644          if (desired > rc->max_length) {      printf("Scene %d (Frames %d-%d): VBVfactor %f\n", l, start, start+length-1 , minf);
1645                  capped_to_max_framesize = 1;  #endif
1646                  desired = rc->max_length;  
1647        scenefactor[l] = minf;
1648          }          }
1649    #undef R
1650    
1651          /* Make sure to not scale below the minimum framesize */  /* last step: now we know of any scene how much it can be scaled up or down without
1652          if (desired < rc->min_length[s->type-1])     violating VBV. Next, distribute bits from the evil scenes to the good ones */
                 desired = rc->min_length[s->type-1];  
1653    
1654          /*    do
1655           * Don't laugh at this very 'simple' quant<->filesize relationship, it    {
1656           * proves to be acurate enough for our algorithm      float S_red = 0.f;    /* how much to redistribute */
1657           */      float S_elig = 0.f;   /* sum of bit for those scenes you can still swallow something*/
1658          data->quant= (s->quant * s->length) / desired;          float f_red;
1659        int l;
1660    
1661          /* Let's clip the computed quantizer, if needed */      for (l=0;l<num_scenes;l++)   /* check how much is wrong */
1662          if (data->quant < 1) {      {
1663                  data->quant = 1;      const int start = scenestart[l];
1664          } else if (data->quant > 31) {      const int length = scenelength[l];
1665                  data->quant = 31;      twopass_stat_t * frames = &rc->stats[start];
         } else if (s->type != XVID_TYPE_IVOP) {  
1666    
1667                  /*        if (scenefactor[l] == 1.) /* exactly 1 means "don't touch this anymore!" */
1668                   * The frame quantizer has not been clipped, this appear to be a good          continue;
                  * computed quantizer, however past frames give us some info about how  
                  * 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;  
1669    
1670                          if (rc->bquant_error[data->quant] >= 1.0) {        if (scenefactor[l] > 1.) /* within limits */
1671                                  rc->bquant_error[data->quant] -= 1.0;        {
1672                                  data->quant++;          for (n= 0; n < length; n++)
1673              S_elig += frames[n].scaled_length;
1674                          }                          }
1675                  } else {        else /* underflowing segment */
1676                          rc->pquant_error[data->quant] += ((double)(s->quant * s->length) / desired) - data->quant;        {
1677            for (n= 0; n < length; n++)
1678                          if (rc->pquant_error[data->quant] >= 1.0) {          {
1679                                  rc->pquant_error[data->quant] -= 1.0;            float newbytes = (float)frames[n].scaled_length * scenefactor[l];
1680                                  ++data->quant;            S_red += (float)frames[n].scaled_length - (float)newbytes;
1681              frames[n].scaled_length =(int)newbytes;
1682                          }                          }
1683            scenefactor[l] = 1.f;
1684                  }                  }
1685          }          }
1686    
1687          /*      if (S_red < 1.f)   /* no more underflows */
1688           * Now we have a computed quant that is in the right quante range, with a        break;
1689           * possible +1 correction due to cumulated error. We can now safely clip  
1690           * the quantizer again with user's quant ranges. "Safely" means the Rate      if (S_elig < 1.f)
1691           * Control could learn more about this quantizer, this knowledge is useful      {
1692           * for future frames even if it this quantizer won't be really used atm,  #ifdef VBV_DEBUG
1693           * that's why we don't perform this clipping earlier.        fprintf(stderr,"Everything underflowing. \n");
1694           */  #endif
1695          if (data->quant < data->min_quant[s->type-1]) {        free(scenefactor);
1696                  data->quant = data->min_quant[s->type-1];        free(scenestart);
1697          } else if (data->quant > data->max_quant[s->type-1]) {        free(scenelength);
1698                  data->quant = data->max_quant[s->type-1];        return -2;
1699          }          }
1700    
1701          /*      f_red = (1.f + S_red/S_elig);
          * To avoid big quality jumps from frame to frame, we apply a "security"  
          * rule that makes |last_quant - new_quant| <= 2. This rule only applies  
          * to predicted frames (P and B)  
          */  
         if (s->type != XVID_TYPE_IVOP && rc->last_quant[s->type-1] && capped_to_max_framesize == 0) {  
1702    
1703                  if (data->quant > rc->last_quant[s->type-1] + 2) {  #ifdef VBV_DEBUG
1704                          data->quant = rc->last_quant[s->type-1] + 2;      printf("Moving %.0f kB to avoid buffer underflow, correction factor: %.5f\n",S_red/1024.f,f_red);
1705                          DPRINTF(XVID_DEBUG_RC, "p/b-frame quantizer prevented from rising too steeply");  #endif
1706                  }  
1707                  if (data->quant < rc->last_quant[s->type-1] - 2) {      violation=0;
1708                          data->quant = rc->last_quant[s->type-1] - 2;      for (l=0; l<num_scenes; l++)   /* scale remaining scenes up to meet total size */
1709                          DPRINTF(XVID_DEBUG_RC, "p/b-frame quantizer prevented from falling too steeply");      {
1710                  }        const int start = scenestart[l];
1711          const int length = scenelength[l];
1712          twopass_stat_t * frames = &rc->stats[start];
1713    
1714          if (scenefactor[l] == 1.)
1715            continue;
1716    
1717          /* there shouldn't be any segments with factor<1 left, so all the rest is >1 */
1718    
1719          for (n= 0; n < length; n++)
1720          {
1721            frames[n].scaled_length = (int)(frames[n].scaled_length * f_red + 0.5);
1722          }          }
1723    
1724          /*        scenefactor[l] /= f_red;
1725           * We don't want to pollute the RC history results when our computed quant        if (scenefactor[l] < 1.f)
1726           * has been computed from a capped frame size          violation=1;
          */  
         if (capped_to_max_framesize == 0) {  
                 rc->last_quant[s->type-1] = data->quant;  
1727          }          }
1728    
1729      } while (violation);
1730    
1731      free(scenefactor);
1732      free(scenestart);
1733      free(scenelength);
1734          return 0;          return 0;
1735  }  }
1736    
1737    
1738    /*****************************************************************************
1739  static int rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)   * Still more low level stuff (nothing to do with stats treatment)
1740     ****************************************************************************/
1741    
1742    /* This function returns an allocated string containing a complete line read
1743     * from the file starting at the current position */
1744    static char *
1745    readline(FILE *f)
1746  {  {
1747      stat_t * s = &rc->stats[data->frame_num];          char *buffer = NULL;
1748            int buffer_size = 0;
1749          /* Insufficent stats data */          int pos = 0;
     if (data->frame_num >= rc->num_frames)  
         return 0;  
1750    
1751      rc->quant_count[data->quant]++;          do {
1752                    int c;
1753    
1754      if (data->type == XVID_TYPE_IVOP) {                  /* Read a character from the stream */
1755          int kfdiff = (rc->keyframe_locations[rc->KF_idx] -      rc->keyframe_locations[rc->KF_idx - 1]);                  c = fgetc(f);
1756    
1757          rc->overflow += rc->KFoverflow;                  /* Is that EOF or new line ? */
1758          rc->KFoverflow = s->desired_length - data->length;                  if(c == EOF || c == '\n')
1759                            break;
1760    
1761          if (kfdiff > 1) {  // non-consecutive keyframes                  /* Do we have to update buffer ? */
1762              rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);                  if(pos >= buffer_size - 1) {
1763          }else{ // consecutive keyframes                          buffer_size += BUF_SZ;
1764                          rc->overflow += rc->KFoverflow;                          buffer = (char*)realloc(buffer, buffer_size);
1765                          rc->KFoverflow = 0;                          if (buffer == NULL)
1766                          rc->KFoverflow_partial = 0;                                  return(NULL);
         }  
         rc->KF_idx++;  
     }else{  
         // distribute part of the keyframe overflow  
         rc->overflow += s->desired_length - data->length + rc->KFoverflow_partial;  
         rc->KFoverflow -= rc->KFoverflow_partial;  
1767      }      }
1768    
1769      DPRINTF(XVID_DEBUG_RC, "[%i] quant:%i stats1:%i scaled:%i actual:%i overflow:%i\n",                  buffer[pos] = c;
1770          data->frame_num,                  pos++;
1771          data->quant,          } while(1);
         s->length,  
         s->scaled_length,  
         data->length,  
         rc->overflow);  
1772    
1773      return(0);          /* Read \n or EOF */
1774            if (buffer == NULL) {
1775                    /* EOF, so we reached the end of the file, return NULL */
1776                    if(feof(f))
1777                            return(NULL);
1778    
1779                    /* Just an empty line with just a newline, allocate a 1 byte buffer to
1780                     * store a zero length string */
1781                    buffer = (char*)malloc(1);
1782                    if(buffer == NULL)
1783                            return(NULL);
1784  }  }
1785    
1786            /* Zero terminated string */
1787            buffer[pos] = '\0';
1788    
1789            return(buffer);
1790    }
1791    
1792  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
1793     * string */
1794    static char *
1795    skipspaces(char *string)
1796  {  {
1797      switch(opt)          const char spaces[] =
1798      {      {
1799      case XVID_PLG_INFO :                          ' ','\t','\0'
1800          return 0;                  };
1801            const char *spacechar = spaces;
1802    
1803            if (string == NULL) return(NULL);
1804    
1805            while (*string != '\0') {
1806                    /* Test against space chars */
1807                    while (*spacechar != '\0') {
1808                            if (*string == *spacechar) {
1809                                    string++;
1810                                    spacechar = spaces;
1811                                    break;
1812                            }
1813                            spacechar++;
1814                    }
1815    
1816      case XVID_PLG_CREATE :                  /* No space char */
1817          return rc_2pass2_create((xvid_plg_create_t*)param1, param2);                  if (*spacechar == '\0') return(string);
1818            }
1819    
1820      case XVID_PLG_DESTROY :          return(string);
1821          return rc_2pass2_destroy((rc_2pass2_t*)handle, (xvid_plg_destroy_t*)param1);  }
1822    
1823      case XVID_PLG_BEFORE :  /* This function returns a boolean that tells if the string is only a
1824          return rc_2pass2_before((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);   * comment */
1825    static int
1826    iscomment(char *string)
1827    {
1828            const char comments[] =
1829                    {
1830                            '#',';', '%', '\0'
1831                    };
1832            const char *cmtchar = comments;
1833            int iscomment = 0;
1834    
1835            if (string == NULL) return(1);
1836    
1837            string = skipspaces(string);
1838    
1839            while(*cmtchar != '\0') {
1840                    if(*string == *cmtchar) {
1841                            iscomment = 1;
1842                            break;
1843                    }
1844                    cmtchar++;
1845            }
1846    
1847      case XVID_PLG_AFTER :          return(iscomment);
         return rc_2pass2_after((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);  
1848      }      }
1849    
1850      return XVID_ERR_FAIL;  #if 0
1851    static void
1852    stats_print(rc_2pass2_t * rc)
1853    {
1854            int i;
1855            const char frame_type[4] = { 'i', 'p', 'b', 's'};
1856    
1857            for (i=0; i<rc->num_frames; i++) {
1858                    twopass_stat_t *s = &rc->stats[i];
1859                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- frame:%d type:%c quant:%d stats:%d scaled:%d desired:%d actual:%d overflow(%c):%.2f\n",
1860                                    i, frame_type[s->type-1], -1, s->length, s->scaled_length,
1861                                    s->desired_length, -1, frame_type[s->type-1], -1.0f);
1862            }
1863  }  }
1864    #endif
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