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revision 1.1.2.6, Tue May 20 17:28:25 2003 UTC revision 1.7, Sun Mar 27 03:59:42 2005 UTC
# Line 1  Line 1 
1  /******************************************************************************  /******************************************************************************
2   *   *
3   * XviD Bit Rate Controller Library   * XviD Bit Rate Controller Library
4   * - VBR 2 pass bitrate controler implementation -   *  - VBR 2 pass bitrate controller implementation -
5   *   *
6   * Copyright (C) 2002 Edouard Gomez <ed.gomez@wanadoo.fr>   *  Copyright (C)      2002 Foxer <email?>
7     *                     2002 Dirk Knop <dknop@gwdg.de>
8     *                2002-2003 Edouard Gomez <ed.gomez@free.fr>
9     *                     2003 Pete Ross <pross@xvid.org>
10   *   *
11   * The curve treatment algorithm is the one implemented by Foxer <email?> and   *  This curve treatment algorithm is the one originally implemented by Foxer
12   * Dirk Knop <dknop@gwdg.de> for the XviD vfw dynamic library.   *  and tuned by Dirk Knop for the XviD vfw frontend.
13   *   *
14   * This program is free software; you can redistribute it and/or modify   * This program is free software; you can redistribute it and/or modify
15   * it under the terms of the GNU General Public License as published by   * it under the terms of the GNU General Public License as published by
# Line 26  Line 29 
29   *   *
30   *****************************************************************************/   *****************************************************************************/
31    
32    #define BQUANT_PRESCALE
33    #undef COMPENSATE_FORMULA
34    
35    /* forces second pass not to be bigger than first */
36    #undef PASS_SMALLER
37    
38    /* automatically alters overflow controls (strength and improvement/degradation)
39            to fight most common problems without user's knowladge */
40    #define SMART_OVERFLOW_SETTING
41    
42  #include <stdio.h>  #include <stdio.h>
43  #include <math.h>  #include <math.h>
44    #include <limits.h>
 #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  #define BUF_SZ 1024          /*----------------------------------
218  #define MAX_COLS    5           * Debug
219             *--------------------------------*/
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      return 1;          case XVID_PLG_BEFORE :
253                    return rc_2pass2_before((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);
254    
255            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->fq_error = 0;
346            rc->min_quant = 1;
347    
348            /* Count frames (and intra frames) in the stats file, store the result into
349             * the rc structure */
350            if (statsfile_count_frames(rc, param->filename) == -1) {
351                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- ERROR: fopen %s failed\n", param->filename);
352                    free(rc);
353                    return(XVID_ERR_FAIL);
354      }      }
     rc->num_frames = i;  
355    
356      fclose(f);          /* 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            /* Check curve for VBV compliancy and rescale if necessary */
456    #ifdef VBV_FORCE
457            if (rc->param.vbv_size==0) {
458                    rc->param.vbv_size      =  3145728;
459                    rc->param.vbv_initial   =  2359296;
460                    rc->param.vbv_maxrate   =  4854000;
461                    rc->param.vbv_peakrate  =  8000000;
462            }
463    #endif
464    
465          rc->count[s->type-1]++;          /* vbv_size==0 switches VBV check off */
466          rc->tot_length[s->type-1] += s->length;          if (rc->param.vbv_size > 0)  {
467                    const double fps = (double)create->fbase/(double)create->fincr;
468                    int status = check_curve_for_vbv_compliancy(rc, fps);
469    
470          if (i == 0 || s->length < rc->min_length[s->type-1]) {                  if (status) {
471              rc->min_length[s->type-1] = s->length;                          DPRINTF(XVID_DEBUG_RC, "[xvid rc] Underflow detected - Scaling Curve for compliancy.\n");
472          }          }
473    
474          if (i == 0 || s->length > rc->max_length) {                  status = scale_curve_for_vbv_compliancy(rc, fps);
             rc->max_length = s->length;  
         }  
475    
476          if (s->type == XVID_TYPE_IVOP) {                  if (status == 0) {
477              rc->keyframe_locations[j] = i;                          DPRINTF(XVID_DEBUG_RC, "[xvid rc] VBV compliant curve scaling done.\n");
478              j++;                  } else {
479                            DPRINTF(XVID_DEBUG_RC, "[xvid rc] VBV compliant curve scaling impossible.\n");
480          }          }
481      }      }
482      rc->keyframe_locations[j] = i;          *handle = rc;
483            return(0);
484  }  }
485    
486    /*----------------------------------------------------------------------------
487     *--------------------------------------------------------------------------*/
488    
489  /* calculate zone weight "center" */  static int
490    rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy)
491    {
492            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- target_total:%lld desired_total:%.2f (%.2f%%) actual_total:%.2f (%.2f%%)\n",
493                            rc->target,
494                            rc->desired_total,
495                            100*rc->desired_total/(double)rc->target,
496                            rc->real_total,
497                            100*rc->real_total/(double)rc->target);
498    
499            free(rc->keyframe_locations);
500            free(rc->stats);
501            free(rc);
502            return(0);
503    }
504    
505  static void zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)  /*----------------------------------------------------------------------------
506     *--------------------------------------------------------------------------*/
507    
508    static int
509    rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)
510  {  {
511      int i,j;          twopass_stat_t * s = &rc->stats[data->frame_num];
512      int n = 0;          double dbytes;
513            double scaled_quant;
514            double overflow;
515            int capped_to_max_framesize = 0;
516    
517      rc->avg_weight = 0.0;          /* This function is quite long but easy to understand. In order to simplify
518      rc->tot_quant = 0;           * the code path (a bit), we treat 3 cases that can return immediatly. */
519    
520            /* First case: Another plugin has already set a quantizer */
521            if (data->quant > 0)
522                    return(0);
523    
524      if (create->num_zones == 0) {          /* Second case: insufficent stats data
525          for (j = 0; j < rc->num_frames; j++) {           * We can't guess much what we should do, let core decide all alone */
526              rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;          if (data->frame_num >= rc->num_frames) {
527              rc->stats[j].weight = 1.0;                  DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- stats file too short (now processing frame %d)",
528                            data->frame_num);
529                    return(0);
530          }          }
531          rc->avg_weight += rc->num_frames * 1.0;  
532          n += rc->num_frames;          /* Third case: We are in a Quant zone
533             * Quant zones must just ensure we use the same settings as first pass
534             * So set the quantizer and the type */
535            if (s->zone_mode == XVID_ZONE_QUANT) {
536                    /* Quant stuff */
537                    rc->fq_error += s->weight;
538                    data->quant = (int)rc->fq_error;
539                    rc->fq_error -= data->quant;
540    
541                    /* The type stuff */
542                    data->type = s->type;
543    
544                    /* The only required data for AFTER step is this one for the overflow
545                     * control */
546                    s->desired_length = s->length;
547    
548                    return(0);
549      }      }
550    
551    
552      for(i=0; i < create->num_zones; i++) {          /*************************************************************************/
553            /*************************************************************************/
554            /*************************************************************************/
555    
556          int next = (i+1<create->num_zones) ? create->zones[i+1].frame : rc->num_frames;          /*-------------------------------------------------------------------------
557             * Frame bit allocation first part
558             *
559             * First steps apply user settings, just like it is done in the theoritical
560             * scaled_curve_apply_advanced_parameters
561             *-----------------------------------------------------------------------*/
562    
563          if (i==0 && create->zones[i].frame > 0) {          /* Set desired to what we are wanting to obtain for this frame */
564              for (j = 0; j < create->zones[i].frame && j < rc->num_frames; j++) {          dbytes = (double)s->scaled_length;
565                  rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;  
566                  rc->stats[j].weight = 1.0;          /* IFrame user settings*/
567            if (s->type == XVID_TYPE_IVOP) {
568                    /* Keyframe boosting -- All keyframes benefit from it */
569                    dbytes += dbytes*rc->param.keyframe_boost / 100;
570    
571    #if 0 /* ToDo: decide how to apply kfthresholding */
572    #endif
573            } else {
574    
575                    /* P/S/B frames must reserve some bits for iframe boosting */
576                    dbytes *= rc->pb_iboost_tax_ratio;
577    
578                    /* Apply assymetric curve compression */
579                    if (rc->param.curve_compression_high || rc->param.curve_compression_low) {
580                            double assymetric_delta;
581    
582                            /* Compute the assymetric delta, this is computed before applying
583                             * the tax, as done in the pre_process function */
584                            if (dbytes > rc->avg_length[s->type-1])
585                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_high / 100.0;
586                            else
587                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_low  / 100.0;
588    
589                            /* Now we must apply the assymetric tax, else our curve compression
590                             * would not give a theoritical target size equal to what it is
591                             * expected */
592                            dbytes *= rc->assymetric_tax_ratio;
593    
594                            /* Now we can add the assymetric delta */
595                            dbytes += assymetric_delta;
596              }              }
             rc->avg_weight += create->zones[i].frame * 1.0;  
             n += create->zones[i].frame;  
597          }          }
598    
599          if (create->zones[i].mode == XVID_ZONE_WEIGHT) {          /* That is what we would like to have -- Don't put that chunk after
600              for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {           * overflow control, otherwise, overflow is counted twice and you obtain
601                  rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;           * half sized bitrate sequences */
602                  rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;          s->desired_length  = (int)dbytes;
603            rc->desired_total += dbytes;
604    
605            /*------------------------------------------------------------------------
606             * Frame bit allocation: overflow control part.
607             *
608             * Unlike the theoritical scaled_curve_apply_advanced_parameters, here
609             * it's real encoding and we need to make sure we don't go so far from
610             * what is our ideal scaled curve.
611             *-----------------------------------------------------------------------*/
612    
613            /* Compute the overflow we should compensate */
614            if (s->type != XVID_TYPE_IVOP || rc->overflow > 0) {
615                    double frametype_factor;
616                    double framesize_factor;
617    
618                    /* Take only the desired part of overflow */
619                    overflow = rc->overflow;
620    
621                    /* Factor that will take care to decrease the overflow applied
622                     * according to the importance of this frame type in term of
623                     * overall size */
624                    frametype_factor  = rc->count[XVID_TYPE_IVOP-1]*rc->avg_length[XVID_TYPE_IVOP-1];
625                    frametype_factor += rc->count[XVID_TYPE_PVOP-1]*rc->avg_length[XVID_TYPE_PVOP-1];
626                    frametype_factor += rc->count[XVID_TYPE_BVOP-1]*rc->avg_length[XVID_TYPE_BVOP-1];
627                    frametype_factor /= rc->count[s->type-1]*rc->avg_length[s->type-1];
628                    frametype_factor  = 1/frametype_factor;
629    
630                    /* Factor that will take care not to compensate too much for this frame
631                     * size */
632                    framesize_factor  = dbytes;
633                    framesize_factor /= rc->avg_length[s->type-1];
634    
635                    /* Treat only the overflow part concerned by this frame type and size */
636                    overflow *= frametype_factor;
637    #if 0
638                    /* Leave this one alone, as it impacts badly on quality */
639                    overflow *= framesize_factor;
640    #endif
641    
642                    /* Apply the overflow strength imposed by the user */
643                    overflow *= (rc->param.overflow_control_strength/100.0f);
644            } else {
645                    /* no negative overflow applied in IFrames because:
646                     *  - their role is important as they're references for P/BFrames.
647                     *  - there aren't much in typical sequences, so if an IFrame overflows too
648                     *    much, this overflow may impact the next IFrame too much and generate
649                     *    a sequence of poor quality frames */
650                    overflow = 0;
651              }              }
652              next -= create->zones[i].frame;  
653              rc->avg_weight += (double)(next * create->zones[i].increment) / (double)create->zones[i].base;          /* Make sure we are not trying to compensate more overflow than we even have */
654              n += next;          if (fabs(overflow) > fabs(rc->overflow))
655          }else{  // XVID_ZONE_QUANT                  overflow = rc->overflow;
656              for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {  
657                  rc->stats[j].zone_mode = XVID_ZONE_QUANT;          /* Make sure the overflow doesn't make the frame size to get out of the range
658                  rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;           * [-max_degradation..+max_improvment] */
659                  rc->tot_quant += rc->stats[j].length;          if (overflow > dbytes*rc->param.max_overflow_improvement / 100) {
660                    if(overflow <= dbytes)
661                            dbytes += dbytes * rc->param.max_overflow_improvement / 100;
662                    else
663                            dbytes += overflow * rc->param.max_overflow_improvement / 100;
664            } else if (overflow < - dbytes * rc->param.max_overflow_degradation / 100) {
665                    dbytes -= dbytes * rc->param.max_overflow_degradation / 100;
666            } else {
667                    dbytes += overflow;
668              }              }
669    
670            /*-------------------------------------------------------------------------
671             * Frame bit allocation last part:
672             *
673             * Cap frame length so we don't reach neither bigger frame sizes than first
674             * pass nor smaller than the allowed minimum.
675             *-----------------------------------------------------------------------*/
676    
677    #ifdef PASS_SMALLER
678            if (dbytes > s->length) {
679                    dbytes = s->length;
680          }          }
681    #endif
682    
683            /* Prevent stupid desired sizes under logical values */
684            if (dbytes < rc->min_length[s->type-1]) {
685                    dbytes = rc->min_length[s->type-1];
686      }      }
     rc->avg_weight = n>0 ? rc->avg_weight/n : 1.0;  
687    
688      DPRINTF(XVID_DEBUG_RC, "center_weight: %f (for %i frames);   fixed_bytes: %i\n", rc->avg_weight, n, rc->tot_quant);          /*------------------------------------------------------------------------
689             * Desired frame length <-> quantizer mapping
690             *-----------------------------------------------------------------------*/
691    
692    #ifdef BQUANT_PRESCALE
693            /* For bframes we prescale the quantizer to avoid too high quant scaling */
694            if(s->type == XVID_TYPE_BVOP) {
695    
696                    twopass_stat_t *b_ref = s;
697    
698                    /* Find the reference frame */
699                    while(b_ref != &rc->stats[0] && b_ref->type == XVID_TYPE_BVOP)
700                            b_ref--;
701    
702                    /* Compute the original quant */
703                    s->quant  = 2*(100*s->quant - data->bquant_offset);
704                    s->quant += data->bquant_ratio - 1; /* to avoid rounding issues */
705                    s->quant  = s->quant/data->bquant_ratio - b_ref->quant;
706  }  }
707    #endif
708    
709            /* Don't laugh at this very 'simple' quant<->size relationship, it
710             * proves to be acurate enough for our algorithm */
711            scaled_quant = (double)s->quant*(double)s->length/(double)dbytes;
712    
713    #ifdef COMPENSATE_FORMULA
714            /* We know xvidcore will apply the bframe formula again, so we compensate
715             * it right now to make sure we would not apply it twice */
716            if(s->type == XVID_TYPE_BVOP) {
717    
718  /* scale the curve */                  twopass_stat_t *b_ref = s;
719    
720  static void internal_scale(rc_2pass2_t *rc)                  /* Find the reference frame */
721  {                  while(b_ref != &rc->stats[0] && b_ref->type == XVID_TYPE_BVOP)
722          int64_t target  = rc->target - rc->tot_quant;                          b_ref--;
723          int64_t pass1_length = rc->tot_length[0] + rc->tot_length[1] + rc->tot_length[2] - rc->tot_quant;  
724          int min_size[3];                  /* Compute the quant it would be if the core did not apply the bframe
725          double scaler;                   * formula */
726          int i;                  scaled_quant  = 100*scaled_quant - data->bquant_offset;
727                    scaled_quant += data->bquant_ratio - 1; /* to avoid rouding issues */
728                    scaled_quant /= data->bquant_ratio;
729            }
730    #endif
731    
732            /* Quantizer has been scaled using floating point operations/results, we
733             * must cast it to integer */
734            data->quant = (int)scaled_quant;
735    
736          /* perform an initial scale pass.          /* Let's clip the computed quantizer, if needed */
737             if a frame size is scaled underneath our hardcoded minimums, then we force the          if (data->quant < 1) {
738             frame size to the minimum, and deduct the original & scaled frmae length from the                  data->quant = 1;
739             original and target total lengths */          } else if (data->quant > 31) {
740                    data->quant = 31;
741            } else {
742    
743          min_size[0] = ((rc->stats[0].blks[0]*22) + 240) / 8;                  /* The frame quantizer has not been clipped, this appears to be a good
744          min_size[1] = (rc->stats[0].blks[0] + 88) / 8;                   * computed quantizer, do not loose quantizer decimal part that we
745          min_size[2] = 8;                   * accumulate for later reuse when its sum represents a complete
746                     * unit. */
747                    rc->quant_error[s->type-1][data->quant] += scaled_quant - (double)data->quant;
748    
749          scaler = (double)target / (double)pass1_length;                  if (rc->quant_error[s->type-1][data->quant] >= 1.0) {
750                            rc->quant_error[s->type-1][data->quant] -= 1.0;
751                            data->quant++;
752                    } else if (rc->quant_error[s->type-1][data->quant] <= -1.0) {
753                            rc->quant_error[s->type-1][data->quant] += 1.0;
754                            data->quant--;
755                    }
756            }
757    
758          if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {          /* Now we have a computed quant that is in the right quante range, with a
759                  DPRINTF(XVID_DEBUG_RC, "undersize warning\n");           * possible +1 correction due to cumulated error. We can now safely clip
760          scaler = 1.0;           * the quantizer again with user's quant ranges. "Safely" means the Rate
761             * Control could learn more about this quantizer, this knowledge is useful
762             * for future frames even if it this quantizer won't be really used atm,
763             * that's why we don't perform this clipping earlier. */
764            if (data->quant < data->min_quant[s->type-1]) {
765                    data->quant = data->min_quant[s->type-1];
766            } else if (data->quant > data->max_quant[s->type-1]) {
767                    data->quant = data->max_quant[s->type-1];
768          }          }
769    
770      DPRINTF(XVID_DEBUG_RC, "target=%i, tot_length=%i, scaler=%f\n", (int)target, (int)pass1_length, scaler);          if (data->quant < rc->min_quant) data->quant = rc->min_quant;
771    
772          for (i=0; i<rc->num_frames; i++) {          /* To avoid big quality jumps from frame to frame, we apply a "security"
773                  stat_t * s = &rc->stats[i];           * rule that makes |last_quant - new_quant| <= 2. This rule only applies
774                  int len;           * to predicted frames (P and B) */
775            if (s->type != XVID_TYPE_IVOP && rc->last_quant[s->type-1] && capped_to_max_framesize == 0) {
776    
777          if (s->zone_mode == XVID_ZONE_QUANT) {                  if (data->quant > rc->last_quant[s->type-1] + 2) {
778              s->scaled_length = s->length;                          data->quant = rc->last_quant[s->type-1] + 2;
779          }else {                          DPRINTF(XVID_DEBUG_RC,
780                      len = (int)((double)s->length * scaler * s->weight / rc->avg_weight);                                          "[xvid rc] -- frame %d p/b-frame quantizer prevented from rising too steeply\n",
781                      if (len < min_size[s->type-1]) {            /* force frame size */                                          data->frame_num);
                             s->scaled_length = min_size[s->type-1];  
                             target -= s->scaled_length;  
                             pass1_length -= s->length;  
                     }else{  
                             s->scaled_length = 0;  
782                      }                      }
783                    if (data->quant < rc->last_quant[s->type-1] - 2) {
784                            data->quant = rc->last_quant[s->type-1] - 2;
785                            DPRINTF(XVID_DEBUG_RC,
786                                            "[xvid rc] -- frame:%d p/b-frame quantizer prevented from falling too steeply\n",
787                                            data->frame_num);
788          }          }
789          }          }
790    
791      scaler = (double)target / (double)pass1_length;          /* We don't want to pollute the RC histerisis when our computed quant has
792      if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {           * been computed from a capped frame size */
793                  DPRINTF(XVID_DEBUG_RC,"undersize warning\n");          if (capped_to_max_framesize == 0)
794                  scaler = 1.0;                  rc->last_quant[s->type-1] = data->quant;
795    
796            /* Don't forget to force 1st pass frame type ;-) */
797            data->type = s->type;
798    
799            return 0;
800          }          }
801    
802          DPRINTF(XVID_DEBUG_RC, "target=%i, tot_length=%i, scaler=%f\n", (int)target, (int)pass1_length, scaler);  /*----------------------------------------------------------------------------
803     *--------------------------------------------------------------------------*/
804    
805          for (i=0; i<rc->num_frames; i++) {  static int
806                  stat_t * s = &rc->stats[i];  rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)
807    {
808            const char frame_type[4] = { 'i', 'p', 'b', 's'};
809            twopass_stat_t * s = &rc->stats[data->frame_num];
810    
811            /* Insufficent stats data */
812            if (data->frame_num >= rc->num_frames)
813                    return 0;
814    
815            /* Update the quantizer counter */
816            rc->quant_count[s->type-1][data->quant]++;
817    
818            /* Update the frame type overflow */
819            if (data->type == XVID_TYPE_IVOP) {
820                    int kfdiff = 0;
821    
822                  if (s->scaled_length==0) {      /* ignore frame with forced frame sizes */                  if(rc->KF_idx != rc->num_frames -1) {
823                          s->scaled_length = (int)((double)s->length * scaler * s->weight / rc->avg_weight);                          kfdiff  = rc->keyframe_locations[rc->KF_idx+1];
824                            kfdiff -= rc->keyframe_locations[rc->KF_idx];
825                  }                  }
826    
827                    /* Flush Keyframe overflow accumulator */
828                    rc->overflow += rc->KFoverflow;
829    
830                    /* Store the frame overflow to the keyframe accumulator */
831                    rc->KFoverflow = s->desired_length - data->length;
832    
833                    if (kfdiff > 1) {
834                            /* Non-consecutive keyframes case:
835                             * We can then divide this total keyframe overflow into equal parts
836                             * that we will distribute into regular overflow at each frame
837                             * between the sequence bounded by two IFrames */
838                            rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);
839                    } else {
840                            /* Consecutive keyframes case:
841                             * Flush immediatly the keyframe overflow and reset keyframe
842                             * overflow */
843                            rc->overflow += rc->KFoverflow;
844                            rc->KFoverflow = 0;
845                            rc->KFoverflow_partial = 0;
846          }          }
847                    rc->KF_idx++;
848            } else {
849                    /* Accumulate the frame overflow */
850                    rc->overflow += s->desired_length - data->length;
851    
852                    /* Distribute part of the keyframe overflow */
853                    rc->overflow += rc->KFoverflow_partial;
854    
855                    /* Don't forget to substract that same amount from the total keyframe
856                     * overflow */
857                    rc->KFoverflow -= rc->KFoverflow_partial;
858  }  }
859    
860            s->error = s->desired_length - data->length;
861            rc->real_total += data->length;
862    
863            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- frame:%d type:%c quant:%d stats:%d scaled:%d desired:%d actual:%d error:%d overflow:%.2f\n",
864                            data->frame_num,
865                            frame_type[data->type-1],
866                            data->quant,
867                            s->length,
868                            s->scaled_length,
869                            s->desired_length,
870                            s->desired_length - s->error,
871                            -s->error,
872                            rc->overflow);
873    
874            return(0);
875    }
876    
877    /*****************************************************************************
878     * Helper functions definition
879     ****************************************************************************/
880    
881    /* Default buffer size for reading lines */
882    #define BUF_SZ   1024
883    
884  void pre_process1(rc_2pass2_t * rc)  /* Helper functions for reading/parsing the stats file */
885    static char *skipspaces(char *string);
886    static int iscomment(char *string);
887    static char *readline(FILE *f);
888    
889    /* This function counts the number of frame entries in the stats file
890     * It also counts the number of I Frames */
891    static int
892    statsfile_count_frames(rc_2pass2_t * rc, char * filename)
893  {  {
894      int i;          FILE * f;
895      double total1, total2;          char *line;
896      uint64_t ivop_boost_total;          int lines;
897    
898      ivop_boost_total = 0;          rc->num_frames = 0;
899      rc->curve_comp_error = 0;          rc->num_keyframes = 0;
900    
901      for (i=0; i<3; i++) {          if ((f = fopen(filename, "rb")) == NULL)
902          rc->tot_scaled_length[i] = 0;                  return(-1);
     }  
903    
904      for (i=0; i<rc->num_frames; i++) {          lines = 0;
905          stat_t * s = &rc->stats[i];          while ((line = readline(f)) != NULL) {
906    
907          rc->tot_scaled_length[s->type-1] += s->scaled_length;                  char *ptr;
908                    char type;
909                    int fields;
910    
911          if (s->type == XVID_TYPE_IVOP) {                  lines++;
912              ivop_boost_total += s->scaled_length * rc->param.keyframe_boost / 100;  
913          }                  /* We skip spaces */
914                    ptr = skipspaces(line);
915    
916                    /* Skip coment lines or empty lines */
917                    if(iscomment(ptr) || *ptr == '\0') {
918                            free(line);
919                            continue;
920      }      }
921    
922      rc->movie_curve = ((double)(rc->tot_scaled_length[XVID_TYPE_PVOP-1] + rc->tot_scaled_length[XVID_TYPE_BVOP-1] + ivop_boost_total) /                  /* Read the stat line from buffer */
923                                          (rc->tot_scaled_length[XVID_TYPE_PVOP-1] + rc->tot_scaled_length[XVID_TYPE_BVOP-1]));                  fields = sscanf(ptr, "%c", &type);
924    
925      for(i=0; i<3; i++) {                  /* Valid stats files have at least 7 fields */
926          if (rc->count[i] == 0 || rc->movie_curve == 0) {                  if (fields == 1) {
927              rc->avg_length[i] = 1;                          switch(type) {
928                            case 'i':
929                            case 'I':
930                                    rc->num_keyframes++;
931                            case 'p':
932                            case 'P':
933                            case 'b':
934                            case 'B':
935                            case 's':
936                            case 'S':
937                                    rc->num_frames++;
938                                    break;
939                            default:
940                                    DPRINTF(XVID_DEBUG_RC,
941                                                    "[xvid rc] -- WARNING: L%d unknown frame type used (%c).\n",
942                                                    lines, type);
943                            }
944          }else{          }else{
945              rc->avg_length[i] = rc->tot_scaled_length[i] / rc->count[i] / rc->movie_curve;                                  DPRINTF(XVID_DEBUG_RC,
946                                                    "[xvid rc] -- WARNING: L%d misses some stat fields (%d).\n",
947                                                    lines, 7-fields);
948          }          }
949    
950                    /* Free the line buffer */
951                    free(line);
952      }      }
953    
954      /* alt curve stuff here */          /* We are done with the file */
955            fclose(f);
956    
957            return(0);
958    }
959    
960      if (rc->param.use_alt_curve) {  /* open stats file(s) and read into rc->stats array */
961          const double avg_pvop = rc->avg_length[XVID_TYPE_PVOP-1];  static int
962          const uint64_t tot_pvop = rc->tot_length[XVID_TYPE_PVOP-1];  statsfile_load(rc_2pass2_t *rc, char * filename)
963          const uint64_t tot_bvop = rc->tot_length[XVID_TYPE_BVOP-1];  {
964          const uint64_t tot_scaled_pvop = rc->tot_scaled_length[XVID_TYPE_PVOP-1];          FILE * f;
965          const uint64_t tot_scaled_bvop = rc->tot_scaled_length[XVID_TYPE_BVOP-1];          int processed_entries;
966    
967                  rc->alt_curve_low = avg_pvop - avg_pvop * (double)rc->param.alt_curve_low_dist / 100.0;          /* Opens the file */
968                  rc->alt_curve_low_diff = avg_pvop - rc->alt_curve_low;          if ((f = fopen(filename, "rb"))==NULL)
969                  rc->alt_curve_high = avg_pvop + avg_pvop * (double)rc->param.alt_curve_high_dist / 100.0;                  return(-1);
                 rc->alt_curve_high_diff = rc->alt_curve_high - avg_pvop;  
970    
971          if (rc->param.alt_curve_use_auto) {          processed_entries = 0;
972              if (tot_bvop + tot_pvop > tot_scaled_bvop + tot_scaled_pvop) {          while(processed_entries < rc->num_frames) {
973                                  rc->param.alt_curve_min_rel_qual = (int)(100.0 - (100.0 - 100.0 /                  char type;
974                                          ((double)(tot_pvop + tot_bvop) / (double)(tot_scaled_pvop + tot_scaled_bvop))) * (double)rc->param.alt_curve_auto_str / 100.0);                  int fields;
975                    twopass_stat_t * s = &rc->stats[processed_entries];
976                    char *line, *ptr;
977    
978                                  if (rc->param.alt_curve_min_rel_qual < 20)                  /* Read the line from the file */
979                                          rc->param.alt_curve_min_rel_qual = 20;                  if((line = readline(f)) == NULL)
980              }else{                          break;
981                                  rc->param.alt_curve_min_rel_qual = 100;  
982              }                  /* We skip spaces */
983                    ptr = skipspaces(line);
984    
985                    /* Skip comment lines or empty lines */
986                    if(iscomment(ptr) || *ptr == '\0') {
987                            free(line);
988                            continue;
989          }          }
                 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;  
990    
991          if (rc->param.alt_curve_low_dist > 100) {                  /* Reset this field that is optional */
992                          switch(rc->param.alt_curve_type) {                  s->scaled_length = 0;
993              case XVID_CURVE_SINE: // Sine Curve (high aggressiveness)  
994                                  rc->alt_curve_qual_dev *= 2.0 / (1.0 + sin(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff)));                  /* Convert the fields */
995                                  rc->alt_curve_mid_qual = 1.0 - rc->alt_curve_qual_dev * sin(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff));                  fields = sscanf(ptr,
996                                                    "%c %d %d %d %d %d %d %d\n",
997                                                    &type,
998                                                    &s->quant,
999                                                    &s->blks[0], &s->blks[1], &s->blks[2],
1000                                                    &s->length, &s->invariant /* not really yet */,
1001                                                    &s->scaled_length);
1002    
1003                    /* Free line buffer, we don't need it anymore */
1004                    free(line);
1005    
1006                    /* Fail silently, this has probably been warned in
1007                     * statsfile_count_frames */
1008                    if(fields != 7 && fields != 8)
1009                            continue;
1010    
1011                    /* Convert frame type and compute the invariant length part */
1012                    switch(type) {
1013                    case 'i':
1014                    case 'I':
1015                            s->type = XVID_TYPE_IVOP;
1016                            s->invariant /= INVARIANT_HEADER_PART_IVOP;
1017                                  break;                                  break;
1018                          case XVID_CURVE_LINEAR: // Linear (medium aggressiveness)                  case 'p':
1019                                  rc->alt_curve_qual_dev *= 2.0 / (1.0 + avg_pvop / rc->alt_curve_low_diff);                  case 'P':
1020                                  rc->alt_curve_mid_qual = 1.0 - rc->alt_curve_qual_dev * avg_pvop / rc->alt_curve_low_diff;                  case 's':
1021                    case 'S':
1022                            s->type = XVID_TYPE_PVOP;
1023                            s->invariant /= INVARIANT_HEADER_PART_PVOP;
1024                                  break;                                  break;
1025                          case XVID_CURVE_COSINE: // Cosine Curve (low aggressiveness)                  case 'b':
1026                                  rc->alt_curve_qual_dev *= 2.0 / (1.0 + (1.0 - cos(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff))));                  case 'B':
1027                                  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)));                          s->type = XVID_TYPE_BVOP;
1028                            s->invariant /= INVARIANT_HEADER_PART_BVOP;
1029                            break;
1030                    default:
1031                            /* Same as before, fail silently */
1032                            continue;
1033                          }                          }
1034    
1035                    /* Ok it seems it's been processed correctly */
1036                    processed_entries++;
1037                  }                  }
1038    
1039            /* Close the file */
1040            fclose(f);
1041    
1042            return(0);
1043      }      }
     /* --- */  
1044    
1045    /* pre-process the statistics data
1046     * - for each type, count, tot_length, min_length, max_length
1047     * - set keyframes_locations, tot_prescaled */
1048    static void
1049    first_pass_stats_prepare_data(rc_2pass2_t * rc)
1050    {
1051            int i,j;
1052    
1053      total1=total2=0;          /* *rc fields initialization
1054      for (i=0; i<rc->num_frames; i++) {           * NB: INT_MAX and INT_MIN are used in order to be immediately replaced
1055          stat_t * s = &rc->stats[i];           *     with real values of the 1pass */
1056            for (i=0; i<3; i++) {
1057                    rc->count[i]=0;
1058                    rc->tot_length[i] = 0;
1059                    rc->tot_invariant[i] = 0;
1060                    rc->min_length[i] = INT_MAX;
1061            }
1062    
1063          if (s->type != XVID_TYPE_IVOP) {          rc->max_length = INT_MIN;
1064              double dbytes,dbytes2;          rc->tot_weighted = 0;
1065    
1066              dbytes = s->scaled_length / rc->movie_curve;          /* Loop through all frames and find/compute all the stuff this function
1067              dbytes2 = 0; /* XXX: warning */           * is supposed to do */
1068              total1 += dbytes;          for (i=j=0; i<rc->num_frames; i++) {
1069              if (s->type == XVID_TYPE_BVOP)                  twopass_stat_t * s = &rc->stats[i];
                 dbytes *= rc->avg_length[XVID_TYPE_PVOP-1] / rc->avg_length[XVID_TYPE_BVOP-1];  
1070    
1071              if (rc->param.use_alt_curve) {                  rc->count[s->type-1]++;
1072                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                  rc->tot_length[s->type-1] += s->length;
1073                    rc->tot_invariant[s->type-1] += s->invariant;
1074                    if (s->zone_mode != XVID_ZONE_QUANT)
1075                            rc->tot_weighted += (int)(s->weight*(s->length - s->invariant));
1076    
1077                      if (dbytes >= rc->alt_curve_high) {                  if (s->length < rc->min_length[s->type-1]) {
1078                                                  dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev);                          rc->min_length[s->type-1] = s->length;
                     }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_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))));  
1079                                                  }                                                  }
1080    
1081                    if (s->length > rc->max_length) {
1082                            rc->max_length = s->length;
1083                                          }                                          }
1084                  }else{  
1085                      if (dbytes <= rc->alt_curve_low) {                  if (s->type == XVID_TYPE_IVOP) {
1086                                                  dbytes2 = dbytes;                          rc->keyframe_locations[j] = i;
1087                      }else{                          j++;
                                                 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))));  
1088                                                  }                                                  }
1089                                          }                                          }
1090    
1091            /* NB:
1092             * The "per sequence" overflow system considers a natural sequence to be
1093             * formed by all frames between two iframes, so if we want to make sure
1094             * the system does not go nuts during last sequence, we force the last
1095             * frame to appear in the keyframe locations array. */
1096            rc->keyframe_locations[j] = i;
1097    
1098            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Min 1st pass IFrame length: %d\n", rc->min_length[0]);
1099            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Min 1st pass PFrame length: %d\n", rc->min_length[1]);
1100            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Min 1st pass BFrame length: %d\n", rc->min_length[2]);
1101                  }                  }
1102    
1103    /* calculate zone weight "center" */
1104    static void
1105    zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)
1106    {
1107            int i,j;
1108            int n = 0;
1109    
1110              }else{          rc->tot_quant = 0;
1111                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {          rc->tot_quant_invariant = 0;
1112                      dbytes2=((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_high / 100.0);  
1113                  }else{          if (create->num_zones == 0) {
1114                                  dbytes2 = ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_low / 100.0);                  for (j = 0; j < rc->num_frames; j++) {
1115                            rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1116                            rc->stats[j].weight = 1.0;
1117                    }
1118                    n += rc->num_frames;
1119            }
1120    
1121    
1122            for(i=0; i < create->num_zones; i++) {
1123    
1124                    int next = (i+1<create->num_zones) ? create->zones[i+1].frame : rc->num_frames;
1125    
1126                    /* Zero weight make no sense */
1127                    if (create->zones[i].increment == 0) create->zones[i].increment = 1;
1128                    /* And obviously an undetermined infinite makes even less sense */
1129                    if (create->zones[i].base == 0) create->zones[i].base = 1;
1130    
1131                    if (i==0 && create->zones[i].frame > 0) {
1132                            for (j = 0; j < create->zones[i].frame && j < rc->num_frames; j++) {
1133                                    rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1134                                    rc->stats[j].weight = 1.0;
1135                  }                  }
1136                            n += create->zones[i].frame;
1137                    }
1138    
1139                    if (create->zones[i].mode == XVID_ZONE_WEIGHT) {
1140                            for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {
1141                                    rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1142                                    rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;
1143                            }
1144                            next -= create->zones[i].frame;
1145                            n += next;
1146                    } else{  /* XVID_ZONE_QUANT */
1147                            for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {
1148                                    rc->stats[j].zone_mode = XVID_ZONE_QUANT;
1149                                    rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;
1150                                    rc->tot_quant += rc->stats[j].length;
1151                                    rc->tot_quant_invariant += rc->stats[j].invariant;
1152              }              }
   
             if (s->type == XVID_TYPE_BVOP) {  
                             dbytes2 *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
                             if (dbytes2 < rc->min_length[XVID_TYPE_BVOP-1])  
                                     dbytes2 = rc->min_length[XVID_TYPE_BVOP-1];  
             }else{  
                             if (dbytes2 < rc->min_length[XVID_TYPE_PVOP-1])  
                                     dbytes2 = rc->min_length[XVID_TYPE_PVOP-1];  
1153              }              }
             total2 += dbytes2;  
1154          }          }
1155      }      }
1156    
     rc->curve_comp_scale = total1 / total2;  
1157    
1158      if (!rc->param.use_alt_curve) {  /* scale the curve */
1159          DPRINTF(XVID_DEBUG_RC, "middle frame size for asymmetric curve compression: %i\n",  static void
1160              (int)(rc->avg_length[XVID_TYPE_PVOP-1] * rc->curve_comp_scale));  first_pass_scale_curve_internal(rc_2pass2_t *rc)
1161      }  {
1162            int64_t target;
1163            int64_t total_invariant;
1164            double scaler;
1165            int i, num_MBs;
1166    
1167      if (rc->param.use_alt_curve) {          /* We only scale texture data ! */
1168          int bonus_bias = rc->param.alt_curve_bonus_bias;          total_invariant  = rc->tot_invariant[XVID_TYPE_IVOP-1];
1169          int oldquant = 1;          total_invariant += rc->tot_invariant[XVID_TYPE_PVOP-1];
1170            total_invariant += rc->tot_invariant[XVID_TYPE_BVOP-1];
1171            /* don't forget to substract header bytes used in quant zones, otherwise we
1172             * counting them twice */
1173            total_invariant -= rc->tot_quant_invariant;
1174    
1175            /* We remove the bytes used by the fixed quantizer zones during first pass
1176             * with the same quants, so we know very precisely how much that
1177             * represents */
1178            target  = rc->target;
1179            target -= rc->tot_quant;
1180    
1181            /* Let's compute a linear scaler in order to perform curve scaling */
1182            scaler = (double)(target - total_invariant) / (double)(rc->tot_weighted);
1183    
1184    #ifdef SMART_OVERFLOW_SETTING
1185            if (scaler > 0.9) {
1186                    rc->param.max_overflow_degradation *= 5;
1187                    rc->param.max_overflow_improvement *= 5;
1188                    rc->param.overflow_control_strength *= 3;
1189            } else if (scaler > 0.6) {
1190                    rc->param.max_overflow_degradation *= 2;
1191                    rc->param.max_overflow_improvement *= 2;
1192                    rc->param.overflow_control_strength *= 2;
1193            } else {
1194                    rc->min_quant = 2;
1195            }
1196    #endif
1197    
1198              if (rc->param.alt_curve_use_auto_bonus_bias)          /* Compute min frame lengths (for each frame type) according to the number
1199                      bonus_bias = rc->param.alt_curve_min_rel_qual;           * of MBs. We sum all block type counters of frame 0, this gives us the
1200             * number of MBs.
1201             *
1202             * We compare these hardcoded values with observed values in first pass
1203             * (determined in pre_process0).Then we keep the real minimum. */
1204    
1205              rc->alt_curve_curve_bias_bonus = (total1 - total2) * (double)bonus_bias / 100.0 / (double)(rc->num_frames /* - credits_frames */ - rc->num_keyframes);          /* Number of MBs */
1206              rc->curve_comp_scale = ((total1 - total2) * (1.0 - (double)bonus_bias / 100.0) + total2) / total2;          num_MBs  = rc->stats[0].blks[0];
1207            num_MBs += rc->stats[0].blks[1];
1208            num_MBs += rc->stats[0].blks[2];
1209    
1210            /* Minimum for I frames */
1211            if(rc->min_length[XVID_TYPE_IVOP-1] > ((num_MBs*22) + 240) / 8)
1212                    rc->min_length[XVID_TYPE_IVOP-1] = ((num_MBs*22) + 240) / 8;
1213    
1214            /* Minimum for P/S frames */
1215            if(rc->min_length[XVID_TYPE_PVOP-1] > ((num_MBs) + 88)  / 8)
1216                    rc->min_length[XVID_TYPE_PVOP-1] = ((num_MBs) + 88)  / 8;
1217    
1218            /* Minimum for B frames */
1219            if(rc->min_length[XVID_TYPE_BVOP-1] > 8)
1220                    rc->min_length[XVID_TYPE_BVOP-1] = 8;
1221    
1222            /* Perform an initial scale pass.
1223             *
1224             * If a frame size is scaled underneath our hardcoded minimums, then we
1225             * force the frame size to the minimum, and deduct the original & scaled
1226             * frame length from the original and target total lengths */
1227            for (i=0; i<rc->num_frames; i++) {
1228                    twopass_stat_t * s = &rc->stats[i];
1229                    int len;
1230    
1231          /* special info for alt curve:  bias bonus and quantizer thresholds */                  /* No need to scale frame length for which a specific quantizer is
1232                     * specified thanks to zones */
1233                    if (s->zone_mode == XVID_ZONE_QUANT) {
1234                            s->scaled_length = s->length;
1235                            continue;
1236                    }
1237    
1238                  DPRINTF(XVID_DEBUG_RC, "avg scaled framesize:%i", (int)rc->avg_length[XVID_TYPE_PVOP-1]);                  /* Compute the scaled length -- only non invariant data length is scaled */
1239                  DPRINTF(XVID_DEBUG_RC, "bias bonus:%i bytes", (int)rc->alt_curve_curve_bias_bonus);                  len = s->invariant + (int)((double)(s->length-s->invariant) * scaler * s->weight);
1240    
1241                  for (i=1; i <= (int)(rc->alt_curve_high*2)+1; i++) {                  /* Compare with the computed minimum */
1242              double curve_temp, dbytes;                  if (len < rc->min_length[s->type-1]) {
1243              int newquant;                          /* This is a 'forced size' frame, set its frame size to the
1244                             * computed minimum */
1245                            s->scaled_length = rc->min_length[s->type-1];
1246    
1247              dbytes = i;                          /* Remove both scaled and original size from their respective
1248                          if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                           * total counters, as we prepare a second pass for 'regular'
1249                  if (dbytes >= rc->alt_curve_high) {                           * frames */
1250                                          curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev);                          target -= s->scaled_length;
                 }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))));  
                                         }  
                                 }  
                         }else{  
                 if (dbytes <= rc->alt_curve_low) {  
                                         curve_temp = dbytes;  
1251                  }else{                  }else{
1252                                          switch(rc->param.alt_curve_type)                          /* Do nothing for now, we'll scale this later */
1253                                          {                          s->scaled_length = 0;
                                         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_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))));  
                                         }  
1254                                  }                                  }
1255                          }                          }
1256    
1257                          if (rc->movie_curve > 1.0)          /* The first pass on data substracted all 'forced size' frames from the
1258                                  dbytes *= rc->movie_curve;           * total counters. Now, it's possible to scale the 'regular' frames. */
1259    
1260                          newquant = (int)(dbytes * 2.0 / (curve_temp * rc->curve_comp_scale + rc->alt_curve_curve_bias_bonus));          /* Scaling factor for 'regular' frames */
1261                          if (newquant > 1) {          scaler = (double)(target - total_invariant) / (double)(rc->tot_weighted);
                                 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);  
                                 }  
                         }  
                 }  
1262    
1263      }          /* Do another pass with the new scaler */
1264            for (i=0; i<rc->num_frames; i++) {
1265                    twopass_stat_t * s = &rc->stats[i];
1266    
1267      rc->overflow = 0;                  /* Ignore frame with forced frame sizes */
1268      rc->KFoverflow = 0;                  if (s->scaled_length == 0)
1269      rc->KFoverflow_partial = 0;                          s->scaled_length = s->invariant + (int)((double)(s->length-s->invariant) * scaler * s->weight);
     rc->KF_idx = 1;  
1270  }  }
1271    
1272            /* Job done */
1273            return;
1274    }
1275    
1276    /* Apply all user settings to the scaled curve
1277     * This implies:
1278  static int rc_2pass2_create(xvid_plg_create_t * create, rc_2pass2_t ** handle)   *   keyframe boosting
1279     *   high/low compression */
1280    static void
1281    scaled_curve_apply_advanced_parameters(rc_2pass2_t * rc)
1282  {  {
     xvid_plugin_2pass2_t * param = (xvid_plugin_2pass2_t *)create->param;  
     rc_2pass2_t * rc;  
1283      int i;      int i;
1284            int64_t ivop_boost_total;
1285    
1286      rc = malloc(sizeof(rc_2pass2_t));          /* Reset the rate controller (per frame type) total byte counters */
1287      if (rc == NULL)          for (i=0; i<3; i++) rc->tot_scaled_length[i] = 0;
         return XVID_ERR_MEMORY;  
   
     rc->param = *param;  
   
     if (rc->param.keyframe_boost <= 0) rc->param.keyframe_boost = 0;  
     if (rc->param.payback_method <= 0) rc->param.payback_method = XVID_PAYBACK_PROP;  
     if (rc->param.bitrate_payback_delay <= 0) rc->param.bitrate_payback_delay = 250;  
     if (rc->param.curve_compression_high <= 0) rc->param.curve_compression_high = 0;  
     if (rc->param.curve_compression_low <= 0) rc->param.curve_compression_low = 0;  
     if (rc->param.max_overflow_improvement <= 0) rc->param.max_overflow_improvement = 60;  
     if (rc->param.max_overflow_degradation <= 0) rc->param.max_overflow_degradation = 60;  
   
     if (rc->param.use_alt_curve <= 0) rc->param.use_alt_curve = 0;  
     if (rc->param.alt_curve_high_dist <= 0) rc->param.alt_curve_high_dist = 500;  
     if (rc->param.alt_curve_low_dist <= 0) rc->param.alt_curve_low_dist = 90;  
     if (rc->param.alt_curve_use_auto <= 0) rc->param.alt_curve_use_auto = 1;  
     if (rc->param.alt_curve_auto_str <= 0) rc->param.alt_curve_auto_str = 30;  
     if (rc->param.alt_curve_type <= 0) rc->param.alt_curve_type = XVID_CURVE_LINEAR;  
     if (rc->param.alt_curve_min_rel_qual <= 0) rc->param.alt_curve_min_rel_qual = 50;  
     if (rc->param.alt_curve_use_auto_bonus_bias <= 0) rc->param.alt_curve_use_auto_bonus_bias = 1;  
     if (rc->param.alt_curve_bonus_bias <= 0) rc->param.alt_curve_bonus_bias = 50;  
   
     if (rc->param.kftreshold <= 0) rc->param.kftreshold = 10;  
     if (rc->param.kfreduction <= 0) rc->param.kfreduction = 20;  
     if (rc->param.min_key_interval <= 0) rc->param.min_key_interval = 300;  
1288    
1289      if (!det_stats_length(rc, param->filename)){          /* Compute total bytes for each frame type */
1290          DPRINTF(XVID_DEBUG_RC,"fopen %s failed\n", param->filename);          for (i=0; i<rc->num_frames;i++) {
1291          free(rc);                  twopass_stat_t *s = &rc->stats[i];
1292          return XVID_ERR_FAIL;                  rc->tot_scaled_length[s->type-1] += s->scaled_length;
1293      }      }
1294    
1295      if ((rc->stats = malloc(rc->num_frames * sizeof(stat_t))) == NULL) {          /* First we compute the total amount of bits needed, as being described by
1296          free(rc);           * the scaled distribution. During this pass over the complete stats data,
1297          return XVID_ERR_MEMORY;           * we see how much bits two user settings will get/give from/to p&b frames:
1298      }           *  - keyframe boosting
1299             *  - keyframe distance penalty */
1300            rc->KF_idx = 0;
1301            ivop_boost_total = 0;
1302            for (i=0; i<rc->num_frames; i++) {
1303                    twopass_stat_t * s = &rc->stats[i];
1304    
1305      /* XXX: do we need an addition location */                  /* Some more work is needed for I frames */
1306      if ((rc->keyframe_locations = malloc((rc->num_keyframes + 1) * sizeof(int))) == NULL) {                  if (s->type == XVID_TYPE_IVOP) {
1307          free(rc->stats);                          int ivop_boost;
         free(rc);  
         return XVID_ERR_MEMORY;  
     }  
1308    
1309      if (!load_stats(rc, param->filename)) {                          /* Accumulate bytes needed for keyframe boosting */
1310          DPRINTF(XVID_DEBUG_RC,"fopen %s failed\n", param->filename);                          ivop_boost = s->scaled_length*rc->param.keyframe_boost/100;
1311          free(rc->keyframe_locations);  
1312          free(rc->stats);  #if 0 /* ToDo: decide how to apply kfthresholding */
1313          free(rc);  #endif
1314          return XVID_ERR_FAIL;                          /* If the frame size drops under the minimum length, then cap ivop_boost */
1315      }                          if (ivop_boost + s->scaled_length < rc->min_length[XVID_TYPE_IVOP-1])
1316                                    ivop_boost = rc->min_length[XVID_TYPE_IVOP-1] - s->scaled_length;
1317    
1318      /* pre-process our stats */                          /* Accumulate the ivop boost */
1319                            ivop_boost_total += ivop_boost;
1320    
1321          if (rc->num_frames  < create->fbase/create->fincr) {                          /* Don't forget to update the keyframe index */
1322                  rc->target = rc->param.bitrate / 8;     /* one second */                          rc->KF_idx++;
1323          }else{                  }
                 rc->target = (rc->param.bitrate * rc->num_frames * create->fincr) / (create->fbase * 8);  
1324          }          }
1325    
1326      DPRINTF(XVID_DEBUG_RC, "rc->target : %i\n", rc->target);          /* Initialize the IBoost tax ratio for P/S/B frames
1327             *
1328          rc->target -= rc->num_frames*24;        /* avi file header */           * This ratio has to be applied to p/b/s frames in order to reserve
1329             * additional bits for keyframes (keyframe boosting) or if too much
1330             * keyframe distance is applied, bits retrieved from the keyframes.
1331             *
1332             * ie pb_length *= rc->pb_iboost_tax_ratio;
1333             *
1334             *    gives the ideal length of a p/b frame */
1335    
1336            /* Compute the total length of p/b/s frames (temporary storage into
1337             * movie_curve) */
1338            rc->pb_iboost_tax_ratio  = (double)rc->tot_scaled_length[XVID_TYPE_PVOP-1];
1339            rc->pb_iboost_tax_ratio += (double)rc->tot_scaled_length[XVID_TYPE_BVOP-1];
1340    
1341            /* Compute the ratio described above
1342             *     taxed_total = sum(0, n, tax*scaled_length)
1343             * <=> taxed_total = tax.sum(0, n, scaled_length)
1344             * <=> tax = taxed_total / original_total */
1345            rc->pb_iboost_tax_ratio =
1346                    (rc->pb_iboost_tax_ratio - ivop_boost_total) /
1347                    rc->pb_iboost_tax_ratio;
1348    
1349          pre_process0(rc);          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- IFrame boost tax ratio:%.2f\n",
1350                            rc->pb_iboost_tax_ratio);
1351    
1352          if (rc->param.bitrate) {          /* Compute the average size of frames per frame type */
1353          zone_process(rc, create);          for(i=0; i<3; i++) {
1354                  internal_scale(rc);                  /* Special case for missing type or weird case */
1355                    if (rc->count[i] == 0 || rc->pb_iboost_tax_ratio == 0) {
1356                            rc->avg_length[i] = 1;
1357      }else{      }else{
1358          /* external scaler: ignore zone */                          rc->avg_length[i] = rc->tot_scaled_length[i];
         for (i=0;i<rc->num_frames;i++) {  
             rc->stats[i].zone_mode = XVID_ZONE_WEIGHT;  
             rc->stats[i].weight = 1.0;  
         }  
         rc->avg_weight = 1.0;  
         rc->tot_quant = 0;  
     }  
         pre_process1(rc);  
1359    
1360      for (i=0; i<32;i++) {                          if (i == (XVID_TYPE_IVOP-1)) {
1361          rc->pquant_error[i] = 0;                                  /* I Frames total has to be added the boost total */
1362          rc->bquant_error[i] = 0;                                  rc->avg_length[i] += ivop_boost_total;
1363          rc->quant_count[i] = 0;                          } else {
1364                                    /* P/B frames has to taxed */
1365                                    rc->avg_length[i] *= rc->pb_iboost_tax_ratio;
1366      }      }
1367    
1368      rc->fq_error = 0;                          /* Finally compute the average frame size */
1369                            rc->avg_length[i] /= (double)rc->count[i];
     *handle = rc;  
         return(0);  
1370  }  }
   
   
 static int rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy)  
 {  
     free(rc->keyframe_locations);  
     free(rc->stats);  
         free(rc);  
         return(0);  
1371  }  }
1372    
1373            /* Assymetric curve compression */
1374            if (rc->param.curve_compression_high || rc->param.curve_compression_low) {
1375                    double symetric_total;
1376                    double assymetric_delta_total;
1377    
1378                    /* Like I frame boosting, assymetric curve compression modifies the total
1379  static int rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)                   * amount of needed bits, we must compute the ratio so we can prescale
1380  {                   lengths */
1381      stat_t * s = &rc->stats[data->frame_num];                  symetric_total = 0;
1382      int overflow;                  assymetric_delta_total = 0;
1383      int desired;                  for (i=0; i<rc->num_frames; i++) {
1384                            double assymetric_delta;
1385      double dbytes;      double dbytes;
1386      double curve_temp;                          twopass_stat_t * s = &rc->stats[i];
     int capped_to_max_framesize = 0;  
1387    
1388      if (data->quant <= 0) {                          /* I Frames are not concerned by assymetric scaling */
1389                            if (s->type == XVID_TYPE_IVOP)
1390                                    continue;
1391    
1392          if (s->zone_mode == XVID_ZONE_QUANT) {                          /* During the real run, we would have to apply the iboost tax */
1393                            dbytes = s->scaled_length * rc->pb_iboost_tax_ratio;
1394    
1395              rc->fq_error += s->weight;                          /* Update the symmetric curve compression total */
1396              data->quant = (int)rc->fq_error;                          symetric_total += dbytes;
             rc->fq_error -= data->quant;  
1397    
1398              s->desired_length = s->length;                          /* Apply assymetric curve compression */
1399                            if (dbytes > rc->avg_length[s->type-1])
1400                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * (double)rc->param.curve_compression_high / 100.0f;
1401                            else
1402                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * (double)rc->param.curve_compression_low  / 100.0f;
1403    
1404          }else { /* XVID_ZONE_WEIGHT */                          /* Cap to the minimum frame size if needed */
1405                            if (dbytes + assymetric_delta < rc->min_length[s->type-1])
1406                                    assymetric_delta = rc->min_length[s->type-1] - dbytes;
1407    
1408              if (data->frame_num >= rc->num_frames) {                          /* Accumulate after assymetric curve compression */
1409                  /* insufficent stats data */                          assymetric_delta_total += assymetric_delta;
                 return 0;  
1410              }              }
1411    
1412              overflow = rc->overflow / 8;        /* XXX: why by 8 */                  /* Compute the tax that all p/b frames have to pay in order to respect the
1413                     * bit distribution changes that the assymetric compression curve imposes
1414              if (s->type == XVID_TYPE_IVOP) {        /* XXX: why */                   * We want assymetric_total = sum(0, n-1, tax.scaled_length)
1415                  overflow = 0;                   *      ie assymetric_total = ratio.sum(0, n-1, scaled_length)
1416                     *         ratio = assymetric_total / symmetric_total */
1417                    rc->assymetric_tax_ratio = ((double)symetric_total - (double)assymetric_delta_total) / (double)symetric_total;
1418            } else {
1419                    rc->assymetric_tax_ratio = 1.0f;
1420              }              }
1421    
1422              desired = s->scaled_length;          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Assymetric tax ratio:%.2f\n", rc->assymetric_tax_ratio);
1423    
1424              dbytes = desired;          /* Last bits that need to be reset */
1425              if (s->type == XVID_TYPE_IVOP) {          rc->overflow = 0;
1426                  dbytes += desired * rc->param.keyframe_boost / 100;          rc->KFoverflow = 0;
1427            rc->KFoverflow_partial = 0;
1428            rc->KF_idx = 0;
1429            rc->desired_total = 0;
1430            rc->real_total = 0;
1431    
1432            /* Job done */
1433            return;
1434              }              }
             dbytes /= rc->movie_curve;  
1435    
1436              if (s->type == XVID_TYPE_BVOP) {  /*****************************************************************************
1437                  dbytes *= rc->avg_length[XVID_TYPE_PVOP-1] / rc->avg_length[XVID_TYPE_BVOP-1];   * VBV compliancy check and scale
1438              }   * MPEG-4 standard specifies certain restrictions for bitrate/framesize in VBR
1439     * to enable playback on devices with limited readspeed and memory (and which
1440     * aren't...)
1441     *
1442     * DivX profiles have 2 criteria: VBV as in MPEG standard
1443     *                                a limit on peak bitrate for any 3 seconds
1444     *
1445     * But if VBV is fulfilled, peakrate is automatically fulfilled in any profile
1446     * define so far, so we check for it (for completeness) but correct only VBV
1447     *
1448     *****************************************************************************/
1449    
1450              if (rc->param.payback_method == XVID_PAYBACK_BIAS) {  #define VBV_COMPLIANT 0
1451                  desired =(int)(rc->curve_comp_error / rc->param.bitrate_payback_delay);  #define VBV_UNDERFLOW 1 /* video buffer runs empty */
1452              }else{  #define VBV_OVERFLOW 2  /* doesn't exist for VBR encoding */
1453                          //printf("desired=%i, dbytes=%i\n", desired,dbytes);  #define VBV_PEAKRATE 4  /* peak bitrate (within 3s) violated */
                         desired = (int)(rc->curve_comp_error * dbytes /  
                                 rc->avg_length[XVID_TYPE_PVOP-1] / rc->param.bitrate_payback_delay);  
                         //printf("desired=%i\n", desired);  
1454    
1455                          if (labs(desired) > fabs(rc->curve_comp_error)) {  static int
1456                                  desired = (int)rc->curve_comp_error;  check_curve_for_vbv_compliancy(rc_2pass2_t * rc, const float fps)
1457                          }  {
1458              }          /* We do all calculations in float, for higher accuracy,
1459             * and in bytes for convenience.
1460             *
1461             * typical values from DivX Home Theater profile:
1462             *  vbv_size= 384*1024 (384kB)
1463             *  vbv_initial= 288*1024 (75% fill)
1464             *  maxrate= 4854000 (4.854MBps)
1465             *  peakrate= 8000000 (8MBps)
1466             *
1467             *  PAL: offset3s = 75 (3 seconds of 25fps)
1468             *  NTSC: offset3s = 90 (3 seconds of 29.97fps) or 72 (3 seconds of 23.976fps)
1469             */
1470    
1471              rc->curve_comp_error -= desired;          const float vbv_size = (float)rc->param.vbv_size/8.f;
1472            float vbvfill = (float)rc->param.vbv_initial/8.f;
1473            float vbvmin;
1474    
1475            const float maxrate = (float)rc->param.vbv_maxrate;
1476            const float peakrate = (float)rc->param.vbv_peakrate;
1477            const float r0 = (int)(maxrate/fps+0.5)/8.f;
1478    
1479              /* alt curve */          int bytes3s = 0;
1480            int offset3s = (int)(3.f*fps+0.5);
1481            int i;
1482    
1483              curve_temp = 0; /* XXX: warning */          /* 1Gbit should be enough to inuitialize the vbvmin
1484             *      an arbitrary high value */
1485            vbvmin = 1000*1000*1000;
1486    
1487              if (rc->param.use_alt_curve) {          for (i=0; i<rc->num_frames; i++) {
1488                  if (s->type != XVID_TYPE_IVOP)  {                  /* DivX 3s peak bitrate check  */
1489                      if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                  bytes3s += rc->stats[i].scaled_length;
1490                          if (dbytes >= rc->alt_curve_high) {                  if (i>=offset3s)
1491                                                  curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev);                          bytes3s -= rc->stats[i-offset3s].scaled_length;
                         }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))));  
                                                 }  
                                         }  
                                 }else{  
                         if (dbytes <= rc->alt_curve_low){  
                                                 curve_temp = dbytes;  
                         }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_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))));  
                             }  
                                         }  
                                 }  
                                 if (s->type == XVID_TYPE_BVOP)  
                                         curve_temp *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
1492    
1493                                  curve_temp = curve_temp * rc->curve_comp_scale + rc->alt_curve_curve_bias_bonus;      /* ignore peakrate constraint if peakrate is <= 0.f */
1494                    if (peakrate>0.f && 8.f*bytes3s > 3*peakrate)
1495                            return(VBV_PEAKRATE);
1496    
1497                                  desired += ((int)curve_temp);                  /* update vbv fill level */
1498                                  rc->curve_comp_error += curve_temp - (int)curve_temp;                  vbvfill += r0 - rc->stats[i].scaled_length;
                         }else{  
                                 if (s->type == XVID_TYPE_BVOP)  
                                         dbytes *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
1499    
1500                                  desired += ((int)dbytes);                  /* this check is _NOT_ an "overflow"! only reading from disk stops then */
1501                                  rc->curve_comp_error += dbytes - (int)dbytes;                  if (vbvfill > vbv_size)
1502                          }                          vbvfill = vbv_size;
1503    
1504              }else if ((rc->param.curve_compression_high + rc->param.curve_compression_low) &&   s->type != XVID_TYPE_IVOP) {                  /* but THIS would be an underflow. report it! */
1505                    if (vbvfill < 0)
1506                            return(VBV_UNDERFLOW);
1507    
1508                  curve_temp = rc->curve_comp_scale;                  /* Store the minimum buffer filling */
1509                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                  if (vbvfill < vbvmin)
1510                      curve_temp *= ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_high / 100.0);                          vbvmin = vbvfill;
                 } else {  
                     curve_temp *= ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_low / 100.0);  
1511                  }                  }
1512    
1513                  if (s->type == XVID_TYPE_BVOP){          DPRINTF(XVID_DEBUG_RC, "[xvid rc] Minimum buffer fill: %f bytes\n", vbvmin);
                     curve_temp *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
                 }  
1514    
1515                  desired += (int)curve_temp;          return(VBV_COMPLIANT);
                 rc->curve_comp_error += curve_temp - (int)curve_temp;  
             }else{  
                 if (s->type == XVID_TYPE_BVOP){  
                                 dbytes *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
1516                  }                  }
1517    
                         desired += (int)dbytes;  
                         rc->curve_comp_error += dbytes - (int)dbytes;  
             }  
1518    
1519    static int
1520    scale_curve_for_vbv_compliancy(rc_2pass2_t * rc, const float fps)
1521    {
1522            /* correct any VBV violations. Peak bitrate violations disappears
1523             * by this automatically
1524             *
1525             * This implementation follows
1526             *
1527             * Westerink, Rajagopalan, Gonzales "Two-pass MPEG-2 variable-bitrate encoding"
1528             * IBM J. RES. DEVELOP. VOL 43, No. 4, July 1999, p.471--488
1529             *
1530             * Thanks, guys! This paper rocks!!! */
1531    
1532            /* For each scene of len N, we have to check up to N^2 possible buffer fills.
1533             * This works well with MPEG-2 where N==12 or so, but for MPEG-4 it's a
1534             * little slow...
1535             *
1536             * TODO: Better control on VBVfill between scenes */
1537    
1538                  if (desired > s->length) {  /* if desired length exceeds the pass1 length.. */          const float vbv_size = (float)rc->param.vbv_size/8.f;
1539                          rc->curve_comp_error += desired - s->length;          const float vbv_initial = (float)rc->param.vbv_initial/8.f;
1540                          desired = s->length;  
1541                  }else{          const float maxrate = 0.9*rc->param.vbv_maxrate;
1542                  if (desired < rc->min_length[s->type-1]) {          const float vbv_low = 0.10f*vbv_size;
1543                      if (s->type == XVID_TYPE_IVOP){          const float r0 = (int)(maxrate/fps+0.5)/8.f;
1544                          rc->curve_comp_error -= rc->min_length[XVID_TYPE_IVOP-1] - desired;  
1545                      }          int i,k,l,n,violation = 0;
1546                      desired = rc->min_length[s->type-1];          float *scenefactor;
1547            int *scenestart;
1548            int *scenelength;
1549    
1550            /* first step: determine how many "scenes" there are and store their
1551             * boundaries we could get all this from existing keyframe_positions,
1552             * somehow, but there we don't have a min_scenelength, and it's no big
1553             * deal to get it again. */
1554    
1555            const int min_scenelength = (int)(fps+0.5);
1556            int num_scenes = 0;
1557            int last_scene = -999;
1558            for (i=0; i<rc->num_frames; i++) {
1559                    if ((rc->stats[i].type == XVID_TYPE_IVOP) && (i-last_scene>min_scenelength)) {
1560                            last_scene = i;
1561                            num_scenes++;
1562                  }                  }
1563                  }                  }
1564    
1565              s->desired_length = desired;          scenefactor = (float*)malloc(num_scenes*sizeof(float));
1566            scenestart = (int*)malloc(num_scenes*sizeof(int));
1567            scenelength = (int*)malloc(num_scenes*sizeof(int));
1568    
1569            if ((!scenefactor) || (!scenestart) || (!scenelength) ) {
1570                    free(scenefactor);
1571                    free(scenestart);
1572                    free(scenelength);
1573                    /* remember: free(0) is valid and does exactly nothing. */
1574                    return(-1);
1575            }
1576    
1577              /* if this keyframe is too close to the next, reduce it's byte allotment          /* count again and safe the length/position */
             XXX: why do we do this after setting the desired length  */  
1578    
1579                  if (s->type == XVID_TYPE_IVOP) {          num_scenes = 0;
1580                          int KFdistance = rc->keyframe_locations[rc->KF_idx] - rc->keyframe_locations[rc->KF_idx - 1];          last_scene = -999;
1581            for (i=0; i<rc->num_frames; i++) {
1582                    if ((rc->stats[i].type == XVID_TYPE_IVOP) && (i-last_scene>min_scenelength)) {
1583                            if (num_scenes>0) {
1584                                    scenelength[num_scenes-1]=i-last_scene;
1585                            }
1586                            scenestart[num_scenes]=i;
1587                            num_scenes++;
1588                            last_scene = i;
1589                    }
1590            }
1591            scenelength[num_scenes-1]=i-last_scene;
1592    
1593                  if (KFdistance < rc->param.kftreshold) {          /* second step: check for each scene, how much we can scale its frames up or
1594             * down such that the VBV restriction is just fulfilled */
1595    #define R(k,n) (((n)+1-(k))*r0)     /* how much enters the buffer between frame k and n */
1596            for (l=0; l<num_scenes;l++) {
1597                    const int start = scenestart[l];
1598                    const int length = scenelength[l];
1599                    twopass_stat_t * frames = &rc->stats[start];
1600    
1601                      KFdistance = KFdistance - rc->param.min_key_interval;                  float S0n,Skn;
1602                    float f,minf = 99999.f;
1603    
1604                                  if (KFdistance >= 0) {                  S0n=0.;
1605                          int KF_min_size;                  for (n=0;n<=length-1;n++) {
1606                            S0n += frames[n].scaled_length;
1607    
1608                                          KF_min_size = desired * (100 - rc->param.kfreduction) / 100;                          k = 0;
1609                                          if (KF_min_size < 1)                          Skn = S0n;
1610                                                  KF_min_size = 1;                          f = (R(k,n-1) + (vbv_initial - vbv_low)) / Skn;
1611                            if (f < minf)
1612                                    minf = f;
1613    
1614                                          desired = KF_min_size + (desired - KF_min_size) * KFdistance /                          for (k=1;k<=n;k++) {
1615                                                  (rc->param.kftreshold - rc->param.min_key_interval);                                  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                     *
1625                     * TODO: Allow other values for buffer fill between scenes
1626                     * e.g. if n=N is smallest f-value, then check for better value */
1627    
1628                  // Foxer: reign in overflow with huge frames                  n=length;
1629                  if (labs(overflow) > labs(rc->overflow)) {                  k=0;
1630                          overflow = rc->overflow;                  Skn = S0n;
1631                  }                  f = R(k,n-1)/Skn;
1632                    if (f < minf)
1633                            minf = f;
1634    
1635              // Foxer: make sure overflow doesn't run away                  for (k=1;k<=n-1;k++) {
1636                            Skn -= frames[k].scaled_length;
1637    
1638                  if (overflow > desired * rc->param.max_overflow_improvement / 100) {                          f = (R(k,n-1) + (vbv_initial - vbv_low)) / Skn;
1639                          desired += (overflow <= desired) ? desired * rc->param.max_overflow_improvement / 100 :                          if (f < minf)
1640                                  overflow * rc->param.max_overflow_improvement / 100;                                  minf = f;
                 }else if (overflow < desired * rc->param.max_overflow_degradation / -100){  
                         desired += desired * rc->param.max_overflow_degradation / -100;  
                 }else{  
                         desired += overflow;  
1641                  }                  }
1642    
1643              if (desired > rc->max_length) {                  DPRINTF(XVID_DEBUG_RC, "[xvid rc] Scene %d (Frames %d-%d): VBVfactor %f\n",
1644                          capped_to_max_framesize = 1;                                  l, start, start+length-1 , minf);
                         desired = rc->max_length;  
                 }  
1645    
1646              // make sure to not scale below the minimum framesize                  scenefactor[l] = minf;
             if (desired < rc->min_length[s->type-1]) {  
                 desired = rc->min_length[s->type-1];  
1647              }              }
1648    #undef R
1649    
1650            /* last step: now we know of any scene how much it can be scaled up or down
1651             * without violating VBV. Next, distribute bits from the evil scenes to the
1652             * good ones */
1653            do {
1654                    float S_red = 0.f;    /* how much to redistribute */
1655                    float S_elig = 0.f;   /* sum of bit for those scenes you can still swallow something*/
1656                    float f_red;
1657                    int l;
1658    
1659              // very 'simple' quant<->filesize relationship                  /* check how much is wrong */
1660              data->quant= (s->quant * s->length) / desired;                  for (l=0;l<num_scenes;l++) {
1661                            const int start = scenestart[l];
1662                            const int length = scenelength[l];
1663                            twopass_stat_t * frames = &rc->stats[start];
1664    
1665                  if (data->quant < 1) {                          /* exactly 1 means "don't touch this anymore!" */
1666                          data->quant = 1;                          if (scenefactor[l] == 1.)
1667              } else if (data->quant > 31) {                                  continue;
                         data->quant = 31;  
                 }  
                 else if (s->type != XVID_TYPE_IVOP)  
                 {  
                         // Foxer: aid desired quantizer precision by accumulating decision error  
                         if (s->type== XVID_TYPE_BVOP) {  
                                 rc->bquant_error[data->quant] += ((double)(s->quant * s->length) / desired) - data->quant;  
1668    
1669                                  if (rc->bquant_error[data->quant] >= 1.0) {                          /* within limits */
1670                                          rc->bquant_error[data->quant] -= 1.0;                          if (scenefactor[l] > 1.) {
1671                                          data->quant++;                                  for (n= 0; n < length; n++)
1672                                  }                                          S_elig += frames[n].scaled_length;
1673                          }else{                          }else{
1674                                  rc->pquant_error[data->quant] += ((double)(s->quant * s->length) / desired) - data->quant;                                  /* underflowing segment */
1675                                    for (n= 0; n < length; n++) {
1676                      if (rc->pquant_error[data->quant] >= 1.0) {                                          float newbytes = (float)frames[n].scaled_length * scenefactor[l];
1677                                          rc->pquant_error[data->quant] -= 1.0;                                          S_red += (float)frames[n].scaled_length - (float)newbytes;
1678                                          ++data->quant;                                          frames[n].scaled_length =(int)newbytes;
1679                                  }                                  }
1680                                    scenefactor[l] = 1.f;
1681                          }                          }
1682                  }                  }
1683    
1684              /* cap to min/max quant */                  /* no more underflows */
1685                    if (S_red < 1.f)
1686                            break;
1687    
1688              if (data->quant < data->min_quant[s->type-1]) {                  if (S_elig < 1.f) {
1689                  data->quant = data->min_quant[s->type-1];                          DPRINTF(XVID_DEBUG_RC, "[xvid rc] Everything underflowing.\n");
1690              }else if (data->quant > data->max_quant[s->type-1]) {                          free(scenefactor);
1691                  data->quant = data->max_quant[s->type-1];                          free(scenestart);
1692                            free(scenelength);
1693                            return(-2);
1694              }              }
1695    
1696              /* subsequent p/b frame quants can only be +- 2 */                  f_red = (1.f + S_red/S_elig);
                 if (s->type != XVID_TYPE_IVOP && rc->last_quant[s->type-1] && capped_to_max_framesize == 0) {  
   
                         if (data->quant > rc->last_quant[s->type-1] + 2) {  
                                 data->quant = rc->last_quant[s->type-1] + 2;  
                                 DPRINTF(XVID_DEBUG_RC, "p/b-frame quantizer prevented from rising too steeply");  
                         }  
                         if (data->quant < rc->last_quant[s->type-1] - 2) {  
                                 data->quant = rc->last_quant[s->type-1] - 2;  
                                 DPRINTF(XVID_DEBUG_RC, "p/b-frame quantizer prevented from falling too steeply");  
                         }  
                 }  
1697    
1698                  if (capped_to_max_framesize == 0) {                  DPRINTF(XVID_DEBUG_RC, "[xvid rc] Moving %.0f kB to avoid buffer underflow, correction factor: %.5f\n",
1699                  rc->last_quant[s->type-1] = data->quant;                                  S_red/1024.f, f_red);
                 }  
1700    
1701                    violation=0;
1702                    /* scale remaining scenes up to meet total size */
1703                    for (l=0; l<num_scenes; l++) {
1704                            const int start = scenestart[l];
1705                            const int length = scenelength[l];
1706                            twopass_stat_t * frames = &rc->stats[start];
1707    
1708          }   /* if */                          if (scenefactor[l] == 1.)
1709                                    continue;
1710    
1711                            /* there shouldn't be any segments with factor<1 left, so all the rest is >1 */
1712                            for (n= 0; n < length; n++) {
1713                                    frames[n].scaled_length = (int)(frames[n].scaled_length * f_red + 0.5);
1714      }      }
1715    
1716      return 0;                          scenefactor[l] /= f_red;
1717                            if (scenefactor[l] < 1.f)
1718                                    violation=1;
1719  }  }
1720    
1721            } while (violation);
1722    
1723            free(scenefactor);
1724            free(scenestart);
1725            free(scenelength);
1726            return(0);
1727    }
1728    
 static int rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)  
 {  
     stat_t * s = &rc->stats[data->frame_num];  
1729    
1730      if (data->frame_num >= rc->num_frames) {  /*****************************************************************************
1731          /* insufficent stats data */   * Still more low level stuff (nothing to do with stats treatment)
1732          return 0;   ****************************************************************************/
1733      }  
1734    /* This function returns an allocated string containing a complete line read
1735     * from the file starting at the current position */
1736    static char *
1737    readline(FILE *f)
1738    {
1739            char *buffer = NULL;
1740            int buffer_size = 0;
1741            int pos = 0;
1742    
1743      rc->quant_count[data->quant]++;          do {
1744                    int c;
1745    
1746      if (data->type == XVID_TYPE_IVOP) {                  /* Read a character from the stream */
1747          int kfdiff = (rc->keyframe_locations[rc->KF_idx] -      rc->keyframe_locations[rc->KF_idx - 1]);                  c = fgetc(f);
1748    
1749          rc->overflow += rc->KFoverflow;                  /* Is that EOF or new line ? */
1750          rc->KFoverflow = s->desired_length - data->length;                  if(c == EOF || c == '\n')
1751                            break;
1752    
1753          if (kfdiff > 1) {  // non-consecutive keyframes                  /* Do we have to update buffer ? */
1754              rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);                  if(pos >= buffer_size - 1) {
1755          }else{ // consecutive keyframes                          buffer_size += BUF_SZ;
1756                          rc->overflow += rc->KFoverflow;                          buffer = (char*)realloc(buffer, buffer_size);
1757                          rc->KFoverflow = 0;                          if (buffer == NULL)
1758                          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;  
1759      }      }
1760    
1761      DPRINTF(XVID_DEBUG_RC, "[%i] quant:%i stats1:%i scaled:%i actual:%i overflow:%i\n",                  buffer[pos] = c;
1762          data->frame_num,                  pos++;
1763          data->quant,          } while(1);
         s->length,  
         s->scaled_length,  
         data->length,  
         rc->overflow);  
1764    
1765      return(0);          /* Read \n or EOF */
1766            if (buffer == NULL) {
1767                    /* EOF, so we reached the end of the file, return NULL */
1768                    if(feof(f))
1769                            return(NULL);
1770    
1771                    /* Just an empty line with just a newline, allocate a 1 byte buffer to
1772                     * store a zero length string */
1773                    buffer = (char*)malloc(1);
1774                    if(buffer == NULL)
1775                            return(NULL);
1776  }  }
1777    
1778            /* Zero terminated string */
1779            buffer[pos] = '\0';
1780    
1781            return(buffer);
1782    }
1783    
1784  int xvid_plugin_2pass2(void * handle, int opt, void * param1, void * param2)  /* This function returns a pointer to the first non space char in the given
1785     * string */
1786    static char *
1787    skipspaces(char *string)
1788  {  {
1789      switch(opt)          const char spaces[] =
1790      {      {
1791      case XVID_PLG_INFO :                          ' ','\t','\0'
1792          return 0;                  };
1793            const char *spacechar = spaces;
1794    
1795            if (string == NULL) return(NULL);
1796    
1797            while (*string != '\0') {
1798                    /* Test against space chars */
1799                    while (*spacechar != '\0') {
1800                            if (*string == *spacechar) {
1801                                    string++;
1802                                    spacechar = spaces;
1803                                    break;
1804                            }
1805                            spacechar++;
1806                    }
1807    
1808      case XVID_PLG_CREATE :                  /* No space char */
1809          return rc_2pass2_create((xvid_plg_create_t*)param1, param2);                  if (*spacechar == '\0') return(string);
1810            }
1811    
1812      case XVID_PLG_DESTROY :          return(string);
1813          return rc_2pass2_destroy((rc_2pass2_t*)handle, (xvid_plg_destroy_t*)param1);  }
1814    
1815      case XVID_PLG_BEFORE :  /* This function returns a boolean that tells if the string is only a
1816          return rc_2pass2_before((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);   * comment */
1817    static int
1818    iscomment(char *string)
1819    {
1820            const char comments[] =
1821                    {
1822                            '#',';', '%', '\0'
1823                    };
1824            const char *cmtchar = comments;
1825            int iscomment = 0;
1826    
1827            if (string == NULL) return(1);
1828    
1829            string = skipspaces(string);
1830    
1831            while(*cmtchar != '\0') {
1832                    if(*string == *cmtchar) {
1833                            iscomment = 1;
1834                            break;
1835                    }
1836                    cmtchar++;
1837            }
1838    
1839      case XVID_PLG_AFTER :          return(iscomment);
         return rc_2pass2_after((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);  
1840      }      }
1841    
1842      return XVID_ERR_FAIL;  #if 0
1843    static void
1844    stats_print(rc_2pass2_t * rc)
1845    {
1846            int i;
1847            const char frame_type[4] = { 'i', 'p', 'b', 's'};
1848    
1849            for (i=0; i<rc->num_frames; i++) {
1850                    twopass_stat_t *s = &rc->stats[i];
1851                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- frame:%d type:%c quant:%d stats:%d scaled:%d desired:%d actual:%d overflow(%c):%.2f\n",
1852                                    i, frame_type[s->type-1], -1, s->length, s->scaled_length,
1853                                    s->desired_length, -1, frame_type[s->type-1], -1.0f);
1854  }  }
1855    }
1856    #endif
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