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revision 1.1.2.6, Tue May 20 17:28:25 2003 UTC revision 1.4, Fri Jun 11 08:44:30 2004 UTC
# Line 1  Line 1 
1  /******************************************************************************  /******************************************************************************
2   *   *
3   * XviD Bit Rate Controller Library   * XviD Bit Rate Controller Library
4   * - VBR 2 pass bitrate controler implementation -   *  - VBR 2 pass bitrate controller implementation -
5   *   *
6   * Copyright (C) 2002 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    /* automtically alters overflow controls (strength and improvement/degradation)
39            to fight most common problems without user's knowladge */
40    #define SMART_OVERFLOW_SETTING
41    
42  #include <stdio.h>  #include <stdio.h>
43  #include <math.h>  #include <math.h>
44    #include <limits.h>
 #define RAD2DEG 57.295779513082320876798154814105  
 #define DEG2RAD 0.017453292519943295769236907684886  
45    
46  #include "../xvid.h"  #include "../xvid.h"
47  #include "../image/image.h"  #include "../image/image.h"
48    
49    /*****************************************************************************
50     * Some default settings
51     ****************************************************************************/
52    
53    #define DEFAULT_KEYFRAME_BOOST 0
54    #define DEFAULT_OVERFLOW_CONTROL_STRENGTH 10
55    #define DEFAULT_CURVE_COMPRESSION_HIGH 0
56    #define DEFAULT_CURVE_COMPRESSION_LOW 0
57    #define DEFAULT_MAX_OVERFLOW_IMPROVEMENT 10
58    #define DEFAULT_MAX_OVERFLOW_DEGRADATION 10
59    
60    /* Keyframe settings */
61    #define DEFAULT_KFREDUCTION 20
62    #define DEFAULT_KFTHRESHOLD 1
63    
64    /*****************************************************************************
65     * Some default constants (can be tuned)
66     ****************************************************************************/
67    
68    /* Specify the invariant part of the headers bits (header+MV)
69     * as  hlength/cst */
70    #define INVARIANT_HEADER_PART_IVOP 1 /* factor 1.0f   */
71    #define INVARIANT_HEADER_PART_PVOP 2 /* factor 0.5f   */
72    #define INVARIANT_HEADER_PART_BVOP 8 /* factor 0.125f */
73    
74    /*****************************************************************************
75     * Structures
76     ****************************************************************************/
77    
78    /* Statistics */
79  typedef struct {  typedef struct {
80      int type;               /* first pass type */      int type;               /* first pass type */
81      int quant;              /* first pass quant */      int quant;              /* first pass quant */
82          int blks[3];                    /* k,m,y blks */          int blks[3];                    /* k,m,y blks */
83      int length;             /* first pass length */      int length;             /* first pass length */
84            int invariant;          /* what we assume as being invariant between the two passes, it's a sub part of header + MV bits */
85      int scaled_length;      /* scaled length */      int scaled_length;      /* scaled length */
86      int desired_length;     /* desired length; calcuated during encoding */          int desired_length;     /* desired length; calculated during encoding */
87            int error;
88    
89      int zone_mode;   /* XVID_ZONE_xxx */      int zone_mode;   /* XVID_ZONE_xxx */
90      double weight;      double weight;
91  } stat_t;  } twopass_stat_t;
   
92    
93    /* Context struct */
   
 /* context struct */  
94  typedef struct  typedef struct
95  {  {
96      xvid_plugin_2pass2_t param;      xvid_plugin_2pass2_t param;
97    
98      /* constant statistical data */          /*----------------------------------
99             * constant statistical data
100             *--------------------------------*/
101    
102            /* Number of frames of the sequence */
103          int num_frames;          int num_frames;
104    
105            /* Number of Intra frames of the sequence */
106      int num_keyframes;      int num_keyframes;
     uint64_t target;    /* target filesize */  
107    
108      int count[3];   /* count of each frame types */          /* Target filesize to reach */
109      uint64_t tot_length[3];  /* total length of each frame types */          uint64_t target;
     double avg_length[3];   /* avg */  
     int min_length[3];  /* min frame length of each frame types */  
     uint64_t tot_scaled_length[3];  /* total scaled length of each frame type */  
     int max_length;     /* max frame size */  
   
     /* zone statistical data */  
     double avg_weight;  /* average weight */  
     int64_t tot_quant;   /* total length used by XVID_ZONE_QUANT zones */  
   
   
     double curve_comp_scale;  
     double movie_curve;  
   
         double alt_curve_low;  
         double alt_curve_high;  
         double alt_curve_low_diff;  
         double alt_curve_high_diff;  
     double alt_curve_curve_bias_bonus;  
         double alt_curve_mid_qual;  
         double alt_curve_qual_dev;  
110    
111      /* dynamic */          /* Count of each frame types */
112            int count[3];
113    
114            /* Total length of each frame types (1st pass) */
115            uint64_t tot_length[3];
116            uint64_t tot_invariant[3];
117    
118            /* Average length of each frame types (used first for 1st pass data and
119             * then for scaled averages */
120            double avg_length[3];
121    
122            /* Minimum frame length allowed for each frame type */
123            int min_length[3];
124    
125            /* Total bytes per frame type once the curve has been scaled
126             * NB: advanced parameters do not change this value. This field
127             *     represents the total scaled w/o any advanced settings */
128            uint64_t tot_scaled_length[3];
129    
130            /* Maximum observed frame size observed during the first pass, the RC
131             * will try tp force all frame sizes in the second pass to be under that
132             * limit */
133            int max_length;
134    
135            /*----------------------------------
136             * Zones statistical data
137             *--------------------------------*/
138    
139            /* Total length used by XVID_ZONE_QUANT zones */
140            uint64_t tot_quant;
141            uint64_t tot_quant_invariant;
142    
143            /* Holds the total amount of frame bytes, zone weighted (only scalable
144             * part of frame bytes) */
145            uint64_t tot_weighted;
146    
147            /*----------------------------------
148             * Advanced settings helper ratios
149             *--------------------------------*/
150    
151            /* This the ratio that has to be applied to all p/b frames in order
152             * to reserve/retrieve bits for/from keyframe boosting and consecutive
153             * keyframe penalty */
154            double pb_iboost_tax_ratio;
155    
156            /* This the ratio to apply to all b/p frames in order to respect the
157             * assymetric curve compression while respecting a target filesize
158             * NB: The assymetric delta gain has to be computed before this ratio
159             *     is applied, and then the delta is added to the scaled size */
160            double assymetric_tax_ratio;
161    
162            /*----------------------------------
163             * Data from the stats file kept
164             * into RAM for easy access
165             *--------------------------------*/
166    
167            /* Array of keyframe locations
168             * eg: rc->keyframe_locations[100] returns the frame number of the 100th
169             *     keyframe */
170      int * keyframe_locations;      int * keyframe_locations;
     stat_t * stats;  
171    
172      double pquant_error[32];          /* Index of the last keyframe used in the keyframe_location */
173      double bquant_error[32];          int KF_idx;
174      int quant_count[32];  
175            /* Array of all 1st pass data file -- see the twopass_stat_t structure
176             * definition for more details */
177            twopass_stat_t * stats;
178    
179            /*----------------------------------
180             * Hysteresis helpers
181             *--------------------------------*/
182    
183            /* This field holds the int2float conversion errors of each quant per
184             * frame type, this allow the RC to keep track of rouding error and thus
185             * increase or decrease the chosen quant according to this residue */
186            double quant_error[3][32];
187    
188            /* This fields stores the count of each quant usage per frame type
189             * No real role but for debugging */
190            int quant_count[3][32];
191    
192            /* Last valid quantizer used per frame type, it allows quantizer
193             * increament/decreament limitation in order to avoid big image quality
194             * "jumps" */
195      int last_quant[3];      int last_quant[3];
196    
197      double curve_comp_error;          /*----------------------------------
198      int overflow;           * Overflow control
199      int KFoverflow;           *--------------------------------*/
200      int KFoverflow_partial;  
201      int KF_idx;          /* Current overflow that has to be distributed to p/b frames */
202            double overflow;
203    
204            /* Total overflow for keyframes -- not distributed directly */
205            double KFoverflow;
206    
207            /* Amount of keyframe overflow to introduce to the global p/b frame
208             * overflow counter at each encoded frame */
209            double KFoverflow_partial;
210    
211            /* Unknown ???
212             * ToDo: description */
213      double fq_error;      double fq_error;
 } rc_2pass2_t;  
   
214    
215            int min_quant; /* internal minimal quant, prevents wrong quants from being used */
216    
217  #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 :
244                    return 0;
245    
246      rc->num_frames = 0;          case XVID_PLG_CREATE :
247      rc->num_keyframes = 0;                  return rc_2pass2_create((xvid_plg_create_t*)param1, param2);
248    
249      if ((f = fopen(filename, "rt")) == NULL)          case XVID_PLG_DESTROY :
250          return 0;                  return rc_2pass2_destroy((rc_2pass2_t*)handle, (xvid_plg_destroy_t*)param1);
251    
252      while((n = fscanf(f, "%c %d %d %d %d %d %d\n",          case XVID_PLG_BEFORE :
253          &type, &ignore, &ignore, &ignore, &ignore, &ignore, &ignore)) != EOF) {                  return rc_2pass2_before((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);
254          if (type == 'i') {  
255              rc->num_frames++;          case XVID_PLG_AFTER :
256              rc->num_keyframes++;                  return rc_2pass2_after((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);
         }else if (type == 'p' || type == 'b' || type == 's') {  
             rc->num_frames++;  
257          }          }
258    
259            return XVID_ERR_FAIL;
260      }      }
261    
262      fclose(f);  /*****************************************************************************
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      return 1;  /*----------------------------------------------------------------------------
280  }   *--------------------------------------------------------------------------*/
281    
282    static int
283    rc_2pass2_create(xvid_plg_create_t * create, rc_2pass2_t **handle)
284    {
285            xvid_plugin_2pass2_t * param = (xvid_plugin_2pass2_t *)create->param;
286            rc_2pass2_t * rc;
287            int i;
288    
289            rc = malloc(sizeof(rc_2pass2_t));
290            if (rc == NULL)
291                    return XVID_ERR_MEMORY;
292    
293            /* v1.0.x */
294            rc->param.version = param->version;
295            rc->param.bitrate = param->bitrate;
296            rc->param.filename = param->filename;
297            rc->param.keyframe_boost = param->keyframe_boost;
298            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  /* open stats file(s) and read into rc->stats array */          /* Initialize some stuff to zero */
335            for(i=0; i<3; i++) {
336                    int j;
337                    for (j=0; j<32; j++) {
338                            rc->quant_error[i][j] = 0;
339                            rc->quant_count[i][j] = 0;
340                    }
341            }
342    
343  static int load_stats(rc_2pass2_t *rc, char * filename)          for (i=0; i<3; i++) rc->last_quant[i] = 0;
 {  
     FILE * f;  
     int i, not_scaled;  
344    
345            rc->fq_error = 0;
346            rc->min_quant = 1;
347    
348      if ((f = fopen(filename, "rt"))==NULL)          /* Count frames (and intra frames) in the stats file, store the result into
349          return 0;           * the rc structure */
350            if (statsfile_count_frames(rc, param->filename) == -1) {
351                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- ERROR: fopen %s failed\n", param->filename);
352                    free(rc);
353                    return(XVID_ERR_FAIL);
354            }
355    
356      i = 0;          /* Allocate the stats' memory */
357          not_scaled = 0;          if ((rc->stats = malloc(rc->num_frames * sizeof(twopass_stat_t))) == NULL) {
358      while(i < rc->num_frames) {                  free(rc);
359          stat_t * s = &rc->stats[i];                  return(XVID_ERR_MEMORY);
360          int n;          }
         char type;  
361    
362                  s->scaled_length = 0;          /* Allocate keyframes location's memory
363          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);           * PS: see comment in pre_process0 for the +1 location requirement */
364          if (n == EOF) break;          rc->keyframe_locations = malloc((rc->num_keyframes + 1) * sizeof(int));
365                  if (n < 7) {          if (rc->keyframe_locations == NULL) {
366                          not_scaled = 1;                  free(rc->stats);
367                    free(rc);
368                    return(XVID_ERR_MEMORY);
369                  }                  }
370    
371          if (type == 'i') {          /* Load the first pass stats */
372              s->type = XVID_TYPE_IVOP;          if (statsfile_load(rc, param->filename) == -1) {
373          }else if (type == 'p' || type == 's') {                  DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- ERROR: fopen %s failed\n", param->filename);
374              s->type = XVID_TYPE_PVOP;                  free(rc->keyframe_locations);
375          }else if (type == 'b') {                  free(rc->stats);
376              s->type = XVID_TYPE_BVOP;                  free(rc);
377          }else{  /* unknown type */                  return XVID_ERR_FAIL;
             DPRINTF(XVID_DEBUG_RC, "unknown stats frame type; assuming pvop");  
             s->type = XVID_TYPE_PVOP;  
378          }          }
379    
380          i++;          /* 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            /* When bitrate is not given it means it has been scaled by an external
410             * application */
411            if (rc->param.bitrate) {
412                    /* 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++) {
424                            rc->stats[i].zone_mode = XVID_ZONE_WEIGHT;
425                            rc->stats[i].weight = 1.0;
426                    }
427                    rc->tot_quant = 0;
428      }      }
     rc->num_frames = i;  
429    
430      fclose(f);          /* Gathers some information about first pass stats:
431             *  - finds the minimum frame length for each frame type during 1st pass.
432             *     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      return 1;          /* If we have a user bitrate, it means it's an internal curve scaling */
446            if (rc->param.bitrate) {
447                    /* Perform internal curve scaling */
448                    first_pass_scale_curve_internal(rc);
449  }  }
450    
451            /* Apply advanced curve options, and compute some parameters in order to
452             * 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    
457  #if 0  #ifdef VBV_FORCE
458  static void print_stats(rc_2pass2_t * rc)    if (rc->param.vbv_size==0)
459  {  {
460      int i;      rc->param.vbv_size      =  3145728;
461      for (i = 0; i < rc->num_frames; i++) {      rc->param.vbv_initial   =  2359296;
462          stat_t * s = &rc->stats[i];      rc->param.vbv_maxrate  =  4000000;
463          DPRINTF(XVID_DEBUG_RC, "%i %i %i %i\n", s->type, s->quant, s->length, s->scaled_length);      rc->param.vbv_peakrate = 10000000;
     }  
464  }  }
465  #endif  #endif
466    
467  /* pre-process the statistics data    if (rc->param.vbv_size>0)    /* vbv_size==0 switches VBV check off */
468      - for each type, count, tot_length, min_length, max_length    {
469      - set keyframes_locations      const double fps = (double)create->fbase/(double)create->fincr;
470  */      int status = check_curve_for_vbv_compliancy(rc, fps);
471    #ifdef VBV_DEBUG
472        if (status)
473          fprintf(stderr,"underflow detected\n Scaling Curve for compliancy... ");
474    #endif
475    
476            status = scale_curve_for_vbv_compliancy(rc, fps);
477    
478    #ifdef VBV_DEBUG
479          if (status==0)
480            fprintf(stderr,"done.\n");
481          else
482            fprintf(stderr,"impossible.\n");
483    #endif
484      }
485            *handle = rc;
486            return(0);
487    }
488    
489    /*----------------------------------------------------------------------------
490     *--------------------------------------------------------------------------*/
491    
492  void pre_process0(rc_2pass2_t * rc)  static int
493    rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy)
494  {  {
495      int i,j;          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- target_total:%lld desired_total:%.2f (%.2f%%) actual_total:%.2f (%.2f%%)\n",
496                            rc->target,
497                            rc->desired_total,
498                            100*rc->desired_total/(double)rc->target,
499                            rc->real_total,
500                            100*rc->real_total/(double)rc->target);
501    
502      for (i=0; i<3; i++) {          free(rc->keyframe_locations);
503          rc->count[i]=0;          free(rc->stats);
504          rc->tot_length[i] = 0;          free(rc);
505          rc->last_quant[i] = 0;          return(0);
506      }      }
507    
508      for (i=j=0; i<rc->num_frames; i++) {  /*----------------------------------------------------------------------------
509          stat_t * s = &rc->stats[i];   *--------------------------------------------------------------------------*/
510    
511          rc->count[s->type-1]++;  static int
512          rc->tot_length[s->type-1] += s->length;  rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)
513    {
514            twopass_stat_t * s = &rc->stats[data->frame_num];
515            double dbytes;
516            double scaled_quant;
517            double overflow;
518            int capped_to_max_framesize = 0;
519    
520          if (i == 0 || s->length < rc->min_length[s->type-1]) {          /* This function is quite long but easy to understand. In order to simplify
521              rc->min_length[s->type-1] = s->length;           * the code path (a bit), we treat 3 cases that can return immediatly. */
522    
523            /* First case: Another plugin has already set a quantizer */
524            if (data->quant > 0)
525                    return(0);
526    
527            /* Second case: insufficent stats data
528             * We can't guess much what we should do, let core decide all alone */
529            if (data->frame_num >= rc->num_frames) {
530                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- stats file too short (now processing frame %d)",
531                            data->frame_num);
532                    return(0);
533          }          }
534    
535          if (i == 0 || s->length > rc->max_length) {          /* Third case: We are in a Quant zone
536              rc->max_length = s->length;           * Quant zones must just ensure we use the same settings as first pass
537             * So set the quantizer and the type */
538            if (s->zone_mode == XVID_ZONE_QUANT) {
539                    /* Quant stuff */
540                    rc->fq_error += s->weight;
541                    data->quant = (int)rc->fq_error;
542                    rc->fq_error -= data->quant;
543    
544                    /* The type stuff */
545                    data->type = s->type;
546    
547                    /* The only required data for AFTER step is this one for the overflow
548                     * control */
549                    s->desired_length = s->length;
550    
551                    return(0);
552          }          }
553    
554    
555            /*************************************************************************/
556            /*************************************************************************/
557            /*************************************************************************/
558    
559            /*-------------------------------------------------------------------------
560             * Frame bit allocation first part
561             *
562             * First steps apply user settings, just like it is done in the theoritical
563             * scaled_curve_apply_advanced_parameters
564             *-----------------------------------------------------------------------*/
565    
566            /* Set desired to what we are wanting to obtain for this frame */
567            dbytes = (double)s->scaled_length;
568    
569            /* IFrame user settings*/
570          if (s->type == XVID_TYPE_IVOP) {          if (s->type == XVID_TYPE_IVOP) {
571              rc->keyframe_locations[j] = i;                  /* Keyframe boosting -- All keyframes benefit from it */
572              j++;                  dbytes += dbytes*rc->param.keyframe_boost / 100;
573    
574    #if 0 /* ToDo: decide how to apply kfthresholding */
575    #endif
576            } else {
577    
578                    /* P/S/B frames must reserve some bits for iframe boosting */
579                    dbytes *= rc->pb_iboost_tax_ratio;
580    
581                    /* Apply assymetric curve compression */
582                    if (rc->param.curve_compression_high || rc->param.curve_compression_low) {
583                            double assymetric_delta;
584    
585                            /* Compute the assymetric delta, this is computed before applying
586                             * the tax, as done in the pre_process function */
587                            if (dbytes > rc->avg_length[s->type-1])
588                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_high / 100.0;
589                            else
590                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_low  / 100.0;
591    
592                            /* Now we must apply the assymetric tax, else our curve compression
593                             * would not give a theoritical target size equal to what it is
594                             * expected */
595                            dbytes *= rc->assymetric_tax_ratio;
596    
597                            /* Now we can add the assymetric delta */
598                            dbytes += assymetric_delta;
599          }          }
600      }      }
601      rc->keyframe_locations[j] = i;  
602            /* That is what we would like to have -- Don't put that chunk after
603             * overflow control, otherwise, overflow is counted twice and you obtain
604             * half sized bitrate sequences */
605            s->desired_length  = (int)dbytes;
606            rc->desired_total += dbytes;
607    
608            /*------------------------------------------------------------------------
609             * Frame bit allocation: overflow control part.
610             *
611             * Unlike the theoritical scaled_curve_apply_advanced_parameters, here
612             * it's real encoding and we need to make sure we don't go so far from
613             * what is our ideal scaled curve.
614             *-----------------------------------------------------------------------*/
615    
616            /* Compute the overflow we should compensate */
617            if (s->type != XVID_TYPE_IVOP || rc->overflow > 0) {
618                    double frametype_factor;
619                    double framesize_factor;
620    
621                    /* Take only the desired part of overflow */
622                    overflow = rc->overflow;
623    
624                    /* Factor that will take care to decrease the overflow applied
625                     * according to the importance of this frame type in term of
626                     * overall size */
627                    frametype_factor  = rc->count[XVID_TYPE_IVOP-1]*rc->avg_length[XVID_TYPE_IVOP-1];
628                    frametype_factor += rc->count[XVID_TYPE_PVOP-1]*rc->avg_length[XVID_TYPE_PVOP-1];
629                    frametype_factor += rc->count[XVID_TYPE_BVOP-1]*rc->avg_length[XVID_TYPE_BVOP-1];
630                    frametype_factor /= rc->count[s->type-1]*rc->avg_length[s->type-1];
631                    frametype_factor  = 1/frametype_factor;
632    
633                    /* Factor that will take care not to compensate too much for this frame
634                     * size */
635                    framesize_factor  = dbytes;
636                    framesize_factor /= rc->avg_length[s->type-1];
637    
638                    /* Treat only the overflow part concerned by this frame type and size */
639                    overflow *= frametype_factor;
640    #if 0
641                    /* Leave this one alone, as it impacts badly on quality */
642                    overflow *= framesize_factor;
643    #endif
644    
645                    /* Apply the overflow strength imposed by the user */
646                    overflow *= (rc->param.overflow_control_strength/100.0f);
647            } else {
648                    /* no negative overflow applied in IFrames because:
649                     *  - their role is important as they're references for P/BFrames.
650                     *  - there aren't much in typical sequences, so if an IFrame overflows too
651                     *    much, this overflow may impact the next IFrame too much and generate
652                     *    a sequence of poor quality frames */
653                    overflow = 0;
654  }  }
655    
656            /* Make sure we are not trying to compensate more overflow than we even have */
657            if (fabs(overflow) > fabs(rc->overflow))
658                    overflow = rc->overflow;
659    
660  /* calculate zone weight "center" */          /* Make sure the overflow doesn't make the frame size to get out of the range
661             * [-max_degradation..+max_improvment] */
662            if (overflow > dbytes*rc->param.max_overflow_improvement / 100) {
663                    if(overflow <= dbytes)
664                            dbytes += dbytes * rc->param.max_overflow_improvement / 100;
665                    else
666                            dbytes += overflow * rc->param.max_overflow_improvement / 100;
667            } else if (overflow < - dbytes * rc->param.max_overflow_degradation / 100) {
668                    dbytes -= dbytes * rc->param.max_overflow_degradation / 100;
669            } else {
670                    dbytes += overflow;
671            }
672    
673  static void zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)          /*-------------------------------------------------------------------------
674  {           * Frame bit allocation last part:
675      int i,j;           *
676      int n = 0;           * Cap frame length so we don't reach neither bigger frame sizes than first
677             * pass nor smaller than the allowed minimum.
678             *-----------------------------------------------------------------------*/
679    
680    #ifdef PASS_SMALLER
681            if (dbytes > s->length) {
682                    dbytes = s->length;
683            }
684    #endif
685    
686      rc->avg_weight = 0.0;          /* Prevent stupid desired sizes under logical values */
687      rc->tot_quant = 0;          if (dbytes < rc->min_length[s->type-1]) {
688                    dbytes = rc->min_length[s->type-1];
689            }
690    
691            /*------------------------------------------------------------------------
692             * Desired frame length <-> quantizer mapping
693             *-----------------------------------------------------------------------*/
694    
695      if (create->num_zones == 0) {  #ifdef BQUANT_PRESCALE
696          for (j = 0; j < rc->num_frames; j++) {          /* For bframes we prescale the quantizer to avoid too high quant scaling */
697              rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;          if(s->type == XVID_TYPE_BVOP) {
698              rc->stats[j].weight = 1.0;  
699                    twopass_stat_t *b_ref = s;
700    
701                    /* Find the reference frame */
702                    while(b_ref != &rc->stats[0] && b_ref->type == XVID_TYPE_BVOP)
703                            b_ref--;
704    
705                    /* Compute the original quant */
706                    s->quant  = 2*(100*s->quant - data->bquant_offset);
707                    s->quant += data->bquant_ratio - 1; /* to avoid rounding issues */
708                    s->quant  = s->quant/data->bquant_ratio - b_ref->quant;
709          }          }
710          rc->avg_weight += rc->num_frames * 1.0;  #endif
711          n += rc->num_frames;  
712            /* Don't laugh at this very 'simple' quant<->size relationship, it
713             * proves to be acurate enough for our algorithm */
714            scaled_quant = (double)s->quant*(double)s->length/(double)dbytes;
715    
716    #ifdef COMPENSATE_FORMULA
717            /* We know xvidcore will apply the bframe formula again, so we compensate
718             * it right now to make sure we would not apply it twice */
719            if(s->type == XVID_TYPE_BVOP) {
720    
721                    twopass_stat_t *b_ref = s;
722    
723                    /* Find the reference frame */
724                    while(b_ref != &rc->stats[0] && b_ref->type == XVID_TYPE_BVOP)
725                            b_ref--;
726    
727                    /* Compute the quant it would be if the core did not apply the bframe
728                     * formula */
729                    scaled_quant  = 100*scaled_quant - data->bquant_offset;
730                    scaled_quant += data->bquant_ratio - 1; /* to avoid rouding issues */
731                    scaled_quant /= data->bquant_ratio;
732      }      }
733    #endif
734    
735            /* Quantizer has been scaled using floating point operations/results, we
736             * must cast it to integer */
737            data->quant = (int)scaled_quant;
738    
739      for(i=0; i < create->num_zones; i++) {          /* Let's clip the computed quantizer, if needed */
740            if (data->quant < 1) {
741                    data->quant = 1;
742            } else if (data->quant > 31) {
743                    data->quant = 31;
744            } else {
745    
746          int next = (i+1<create->num_zones) ? create->zones[i+1].frame : rc->num_frames;                  /* The frame quantizer has not been clipped, this appears to be a good
747                     * computed quantizer, do not loose quantizer decimal part that we
748                     * accumulate for later reuse when its sum represents a complete
749                     * unit. */
750                    rc->quant_error[s->type-1][data->quant] += scaled_quant - (double)data->quant;
751    
752          if (i==0 && create->zones[i].frame > 0) {                  if (rc->quant_error[s->type-1][data->quant] >= 1.0) {
753              for (j = 0; j < create->zones[i].frame && j < rc->num_frames; j++) {                          rc->quant_error[s->type-1][data->quant] -= 1.0;
754                  rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;                          data->quant++;
755                  rc->stats[j].weight = 1.0;                  } else if (rc->quant_error[s->type-1][data->quant] <= -1.0) {
756                            rc->quant_error[s->type-1][data->quant] += 1.0;
757                            data->quant--;
758              }              }
             rc->avg_weight += create->zones[i].frame * 1.0;  
             n += create->zones[i].frame;  
759          }          }
760    
761          if (create->zones[i].mode == XVID_ZONE_WEIGHT) {          /* Now we have a computed quant that is in the right quante range, with a
762              for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {           * possible +1 correction due to cumulated error. We can now safely clip
763                  rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;           * the quantizer again with user's quant ranges. "Safely" means the Rate
764                  rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;           * Control could learn more about this quantizer, this knowledge is useful
765             * for future frames even if it this quantizer won't be really used atm,
766             * that's why we don't perform this clipping earlier. */
767            if (data->quant < data->min_quant[s->type-1]) {
768                    data->quant = data->min_quant[s->type-1];
769            } else if (data->quant > data->max_quant[s->type-1]) {
770                    data->quant = data->max_quant[s->type-1];
771              }              }
772              next -= create->zones[i].frame;  
773              rc->avg_weight += (double)(next * create->zones[i].increment) / (double)create->zones[i].base;          if (data->quant < rc->min_quant) data->quant = rc->min_quant;
774              n += next;  
775          }else{  // XVID_ZONE_QUANT          /* To avoid big quality jumps from frame to frame, we apply a "security"
776              for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {           * rule that makes |last_quant - new_quant| <= 2. This rule only applies
777                  rc->stats[j].zone_mode = XVID_ZONE_QUANT;           * to predicted frames (P and B) */
778                  rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;          if (s->type != XVID_TYPE_IVOP && rc->last_quant[s->type-1] && capped_to_max_framesize == 0) {
779                  rc->tot_quant += rc->stats[j].length;  
780                    if (data->quant > rc->last_quant[s->type-1] + 2) {
781                            data->quant = rc->last_quant[s->type-1] + 2;
782                            DPRINTF(XVID_DEBUG_RC,
783                                            "[xvid rc] -- frame %d p/b-frame quantizer prevented from rising too steeply\n",
784                                            data->frame_num);
785              }              }
786                    if (data->quant < rc->last_quant[s->type-1] - 2) {
787                            data->quant = rc->last_quant[s->type-1] - 2;
788                            DPRINTF(XVID_DEBUG_RC,
789                                            "[xvid rc] -- frame:%d p/b-frame quantizer prevented from falling too steeply\n",
790                                            data->frame_num);
791          }          }
792      }      }
     rc->avg_weight = n>0 ? rc->avg_weight/n : 1.0;  
793    
794      DPRINTF(XVID_DEBUG_RC, "center_weight: %f (for %i frames);   fixed_bytes: %i\n", rc->avg_weight, n, rc->tot_quant);          /* We don't want to pollute the RC histerisis when our computed quant has
795  }           * been computed from a capped frame size */
796            if (capped_to_max_framesize == 0)
797                    rc->last_quant[s->type-1] = data->quant;
798    
799            /* Don't forget to force 1st pass frame type ;-) */
800            data->type = s->type;
801    
802  /* scale the curve */          return 0;
803    }
804    
805  static void internal_scale(rc_2pass2_t *rc)  /*----------------------------------------------------------------------------
806  {   *--------------------------------------------------------------------------*/
         int64_t target  = rc->target - rc->tot_quant;  
         int64_t pass1_length = rc->tot_length[0] + rc->tot_length[1] + rc->tot_length[2] - rc->tot_quant;  
         int min_size[3];  
         double scaler;  
         int i;  
807    
808    static int
809    rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)
810    {
811            const char frame_type[4] = { 'i', 'p', 'b', 's'};
812            twopass_stat_t * s = &rc->stats[data->frame_num];
813    
814          /* perform an initial scale pass.          /* Insufficent stats data */
815             if a frame size is scaled underneath our hardcoded minimums, then we force the          if (data->frame_num >= rc->num_frames)
816             frame size to the minimum, and deduct the original & scaled frmae length from the                  return 0;
            original and target total lengths */  
817    
818          min_size[0] = ((rc->stats[0].blks[0]*22) + 240) / 8;          /* Update the quantizer counter */
819          min_size[1] = (rc->stats[0].blks[0] + 88) / 8;          rc->quant_count[s->type-1][data->quant]++;
         min_size[2] = 8;  
820    
821          scaler = (double)target / (double)pass1_length;          /* Update the frame type overflow */
822            if (data->type == XVID_TYPE_IVOP) {
823                    int kfdiff = 0;
824    
825          if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {                  if(rc->KF_idx != rc->num_frames -1) {
826                  DPRINTF(XVID_DEBUG_RC, "undersize warning\n");                          kfdiff  = rc->keyframe_locations[rc->KF_idx+1];
827          scaler = 1.0;                          kfdiff -= rc->keyframe_locations[rc->KF_idx];
828          }          }
829    
830      DPRINTF(XVID_DEBUG_RC, "target=%i, tot_length=%i, scaler=%f\n", (int)target, (int)pass1_length, scaler);                  /* Flush Keyframe overflow accumulator */
831                    rc->overflow += rc->KFoverflow;
832    
833          for (i=0; i<rc->num_frames; i++) {                  /* Store the frame overflow to the keyframe accumulator */
834                  stat_t * s = &rc->stats[i];                  rc->KFoverflow = s->desired_length - data->length;
                 int len;  
835    
836          if (s->zone_mode == XVID_ZONE_QUANT) {                  if (kfdiff > 1) {
837              s->scaled_length = s->length;                          /* Non-consecutive keyframes case:
838          }else {                           * We can then divide this total keyframe overflow into equal parts
839                      len = (int)((double)s->length * scaler * s->weight / rc->avg_weight);                           * that we will distribute into regular overflow at each frame
840                      if (len < min_size[s->type-1]) {            /* force frame size */                           * between the sequence bounded by two IFrames */
841                              s->scaled_length = min_size[s->type-1];                          rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);
                             target -= s->scaled_length;  
                             pass1_length -= s->length;  
842                      }else{                      }else{
843                              s->scaled_length = 0;                          /* Consecutive keyframes case:
844                      }                           * Flush immediatly the keyframe overflow and reset keyframe
845          }                           * overflow */
846                            rc->overflow += rc->KFoverflow;
847                            rc->KFoverflow = 0;
848                            rc->KFoverflow_partial = 0;
849          }          }
850                    rc->KF_idx++;
851            } else {
852                    /* Accumulate the frame overflow */
853                    rc->overflow += s->desired_length - data->length;
854    
855      scaler = (double)target / (double)pass1_length;                  /* Distribute part of the keyframe overflow */
856      if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {                  rc->overflow += rc->KFoverflow_partial;
857                  DPRINTF(XVID_DEBUG_RC,"undersize warning\n");  
858                  scaler = 1.0;                  /* Don't forget to substract that same amount from the total keyframe
859                     * overflow */
860                    rc->KFoverflow -= rc->KFoverflow_partial;
861          }          }
862    
863          DPRINTF(XVID_DEBUG_RC, "target=%i, tot_length=%i, scaler=%f\n", (int)target, (int)pass1_length, scaler);          rc->overflow += (s->error = s->desired_length - data->length);
864            rc->real_total += data->length;
865    
866          for (i=0; i<rc->num_frames; i++) {          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- frame:%d type:%c quant:%d stats:%d scaled:%d desired:%d actual:%d error:%d overflow:%.2f\n",
867                  stat_t * s = &rc->stats[i];                          data->frame_num,
868                            frame_type[data->type-1],
869                            data->quant,
870                            s->length,
871                            s->scaled_length,
872                            s->desired_length,
873                            s->desired_length - s->error,
874                            -s->error,
875                            rc->overflow);
876    
877                  if (s->scaled_length==0) {      /* ignore frame with forced frame sizes */          return(0);
                         s->scaled_length = (int)((double)s->length * scaler * s->weight / rc->avg_weight);  
                 }  
         }  
878  }  }
879    
880    /*****************************************************************************
881     * Helper functions definition
882     ****************************************************************************/
883    
884    /* Default buffer size for reading lines */
885    #define BUF_SZ   1024
886    
887    /* Helper functions for reading/parsing the stats file */
888  void pre_process1(rc_2pass2_t * rc)  static char *skipspaces(char *string);
889    static int iscomment(char *string);
890    static char *readline(FILE *f);
891    
892    /* This function counts the number of frame entries in the stats file
893     * It also counts the number of I Frames */
894    static int
895    statsfile_count_frames(rc_2pass2_t * rc, char * filename)
896  {  {
897      int i;          FILE * f;
898      double total1, total2;          char *line;
899      uint64_t ivop_boost_total;          int lines;
900    
901      ivop_boost_total = 0;          rc->num_frames = 0;
902      rc->curve_comp_error = 0;          rc->num_keyframes = 0;
903    
904      for (i=0; i<3; i++) {          if ((f = fopen(filename, "rb")) == NULL)
905          rc->tot_scaled_length[i] = 0;                  return(-1);
     }  
906    
907      for (i=0; i<rc->num_frames; i++) {          lines = 0;
908          stat_t * s = &rc->stats[i];          while ((line = readline(f)) != NULL) {
909    
910          rc->tot_scaled_length[s->type-1] += s->scaled_length;                  char *ptr;
911                    char type;
912                    int fields;
913    
914          if (s->type == XVID_TYPE_IVOP) {                  lines++;
915              ivop_boost_total += s->scaled_length * rc->param.keyframe_boost / 100;  
916          }                  /* We skip spaces */
917                    ptr = skipspaces(line);
918    
919                    /* Skip coment lines or empty lines */
920                    if(iscomment(ptr) || *ptr == '\0') {
921                            free(line);
922                            continue;
923      }      }
924    
925      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 */
926                                          (rc->tot_scaled_length[XVID_TYPE_PVOP-1] + rc->tot_scaled_length[XVID_TYPE_BVOP-1]));                  fields = sscanf(ptr, "%c", &type);
927    
928      for(i=0; i<3; i++) {                  /* Valid stats files have at least 7 fields */
929          if (rc->count[i] == 0 || rc->movie_curve == 0) {                  if (fields == 1) {
930              rc->avg_length[i] = 1;                          switch(type) {
931                            case 'i':
932                            case 'I':
933                                    rc->num_keyframes++;
934                            case 'p':
935                            case 'P':
936                            case 'b':
937                            case 'B':
938                            case 's':
939                            case 'S':
940                                    rc->num_frames++;
941                                    break;
942                            default:
943                                    DPRINTF(XVID_DEBUG_RC,
944                                                    "[xvid rc] -- WARNING: L%d unknown frame type used (%c).\n",
945                                                    lines, type);
946                            }
947          }else{          }else{
948              rc->avg_length[i] = rc->tot_scaled_length[i] / rc->count[i] / rc->movie_curve;                                  DPRINTF(XVID_DEBUG_RC,
949                                                    "[xvid rc] -- WARNING: L%d misses some stat fields (%d).\n",
950                                                    lines, 7-fields);
951          }          }
952    
953                    /* Free the line buffer */
954                    free(line);
955      }      }
956    
957      /* alt curve stuff here */          /* We are done with the file */
958            fclose(f);
959    
960      if (rc->param.use_alt_curve) {          return(0);
961          const double avg_pvop = rc->avg_length[XVID_TYPE_PVOP-1];  }
         const uint64_t tot_pvop = rc->tot_length[XVID_TYPE_PVOP-1];  
         const uint64_t tot_bvop = rc->tot_length[XVID_TYPE_BVOP-1];  
         const uint64_t tot_scaled_pvop = rc->tot_scaled_length[XVID_TYPE_PVOP-1];  
         const uint64_t tot_scaled_bvop = rc->tot_scaled_length[XVID_TYPE_BVOP-1];  
962    
963                  rc->alt_curve_low = avg_pvop - avg_pvop * (double)rc->param.alt_curve_low_dist / 100.0;  /* open stats file(s) and read into rc->stats array */
964                  rc->alt_curve_low_diff = avg_pvop - rc->alt_curve_low;  static int
965                  rc->alt_curve_high = avg_pvop + avg_pvop * (double)rc->param.alt_curve_high_dist / 100.0;  statsfile_load(rc_2pass2_t *rc, char * filename)
966                  rc->alt_curve_high_diff = rc->alt_curve_high - avg_pvop;  {
967            FILE * f;
968            int processed_entries;
969    
970          if (rc->param.alt_curve_use_auto) {          /* Opens the file */
971              if (tot_bvop + tot_pvop > tot_scaled_bvop + tot_scaled_pvop) {          if ((f = fopen(filename, "rb"))==NULL)
972                                  rc->param.alt_curve_min_rel_qual = (int)(100.0 - (100.0 - 100.0 /                  return(-1);
                                         ((double)(tot_pvop + tot_bvop) / (double)(tot_scaled_pvop + tot_scaled_bvop))) * (double)rc->param.alt_curve_auto_str / 100.0);  
973    
974                                  if (rc->param.alt_curve_min_rel_qual < 20)          processed_entries = 0;
975                                          rc->param.alt_curve_min_rel_qual = 20;          while(processed_entries < rc->num_frames) {
976              }else{                  char type;
977                                  rc->param.alt_curve_min_rel_qual = 100;                  int fields;
978              }                  twopass_stat_t * s = &rc->stats[processed_entries];
979                    char *line, *ptr;
980    
981                    /* Read the line from the file */
982                    if((line = readline(f)) == NULL)
983                            break;
984    
985                    /* We skip spaces */
986                    ptr = skipspaces(line);
987    
988                    /* Skip comment lines or empty lines */
989                    if(iscomment(ptr) || *ptr == '\0') {
990                            free(line);
991                            continue;
992          }          }
                 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;  
993    
994          if (rc->param.alt_curve_low_dist > 100) {                  /* Reset this field that is optional */
995                          switch(rc->param.alt_curve_type) {                  s->scaled_length = 0;
996              case XVID_CURVE_SINE: // Sine Curve (high aggressiveness)  
997                                  rc->alt_curve_qual_dev *= 2.0 / (1.0 + sin(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff)));                  /* Convert the fields */
998                                  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,
999                                                    "%c %d %d %d %d %d %d %d\n",
1000                                                    &type,
1001                                                    &s->quant,
1002                                                    &s->blks[0], &s->blks[1], &s->blks[2],
1003                                                    &s->length, &s->invariant /* not really yet */,
1004                                                    &s->scaled_length);
1005    
1006                    /* Free line buffer, we don't need it anymore */
1007                    free(line);
1008    
1009                    /* Fail silently, this has probably been warned in
1010                     * statsfile_count_frames */
1011                    if(fields != 7 && fields != 8)
1012                            continue;
1013    
1014                    /* Convert frame type and compute the invariant length part */
1015                    switch(type) {
1016                    case 'i':
1017                    case 'I':
1018                            s->type = XVID_TYPE_IVOP;
1019                            s->invariant /= INVARIANT_HEADER_PART_IVOP;
1020                            break;
1021                    case 'p':
1022                    case 'P':
1023                    case 's':
1024                    case 'S':
1025                            s->type = XVID_TYPE_PVOP;
1026                            s->invariant /= INVARIANT_HEADER_PART_PVOP;
1027                                  break;                                  break;
1028                          case XVID_CURVE_LINEAR: // Linear (medium aggressiveness)                  case 'b':
1029                                  rc->alt_curve_qual_dev *= 2.0 / (1.0 + avg_pvop / rc->alt_curve_low_diff);                  case 'B':
1030                                  rc->alt_curve_mid_qual = 1.0 - rc->alt_curve_qual_dev * avg_pvop / rc->alt_curve_low_diff;                          s->type = XVID_TYPE_BVOP;
1031                            s->invariant /= INVARIANT_HEADER_PART_BVOP;
1032                                  break;                                  break;
1033                          case XVID_CURVE_COSINE: // Cosine Curve (low aggressiveness)                  default:
1034                                  rc->alt_curve_qual_dev *= 2.0 / (1.0 + (1.0 - cos(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff))));                          /* Same as before, fail silently */
1035                                  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)));                          continue;
1036                          }                          }
1037    
1038                    /* Ok it seems it's been processed correctly */
1039                    processed_entries++;
1040                  }                  }
1041    
1042            /* Close the file */
1043            fclose(f);
1044    
1045            return(0);
1046      }      }
     /* --- */  
1047    
1048    /* pre-process the statistics data
1049     * - for each type, count, tot_length, min_length, max_length
1050     * - set keyframes_locations, tot_prescaled */
1051    static void
1052    first_pass_stats_prepare_data(rc_2pass2_t * rc)
1053    {
1054            int i,j;
1055    
1056      total1=total2=0;          /* *rc fields initialization
1057      for (i=0; i<rc->num_frames; i++) {           * NB: INT_MAX and INT_MIN are used in order to be immediately replaced
1058          stat_t * s = &rc->stats[i];           *     with real values of the 1pass */
1059            for (i=0; i<3; i++) {
1060                    rc->count[i]=0;
1061                    rc->tot_length[i] = 0;
1062                    rc->tot_invariant[i] = 0;
1063                    rc->min_length[i] = INT_MAX;
1064            }
1065    
1066          if (s->type != XVID_TYPE_IVOP) {          rc->max_length = INT_MIN;
1067              double dbytes,dbytes2;          rc->tot_weighted = 0;
1068    
1069              dbytes = s->scaled_length / rc->movie_curve;          /* Loop through all frames and find/compute all the stuff this function
1070              dbytes2 = 0; /* XXX: warning */           * is supposed to do */
1071              total1 += dbytes;          for (i=j=0; i<rc->num_frames; i++) {
1072              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];  
1073    
1074              if (rc->param.use_alt_curve) {                  rc->count[s->type-1]++;
1075                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                  rc->tot_length[s->type-1] += s->length;
1076                    rc->tot_invariant[s->type-1] += s->invariant;
1077                    if (s->zone_mode != XVID_ZONE_QUANT)
1078                            rc->tot_weighted += (int)(s->weight*(s->length - s->invariant));
1079    
1080                      if (dbytes >= rc->alt_curve_high) {                  if (s->length < rc->min_length[s->type-1]) {
1081                                                  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))));  
1082                                                  }                                                  }
1083    
1084                    if (s->length > rc->max_length) {
1085                            rc->max_length = s->length;
1086                                          }                                          }
1087                  }else{  
1088                      if (dbytes <= rc->alt_curve_low) {                  if (s->type == XVID_TYPE_IVOP) {
1089                                                  dbytes2 = dbytes;                          rc->keyframe_locations[j] = i;
1090                      }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))));  
1091                                                  }                                                  }
1092                                          }                                          }
1093    
1094            /* NB:
1095             * The "per sequence" overflow system considers a natural sequence to be
1096             * formed by all frames between two iframes, so if we want to make sure
1097             * the system does not go nuts during last sequence, we force the last
1098             * frame to appear in the keyframe locations array. */
1099            rc->keyframe_locations[j] = i;
1100    
1101            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Min 1st pass IFrame length: %d\n", rc->min_length[0]);
1102            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Min 1st pass PFrame length: %d\n", rc->min_length[1]);
1103            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Min 1st pass BFrame length: %d\n", rc->min_length[2]);
1104                  }                  }
1105    
1106    /* calculate zone weight "center" */
1107    static void
1108    zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)
1109    {
1110            int i,j;
1111            int n = 0;
1112    
1113              }else{          rc->tot_quant = 0;
1114                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {          rc->tot_quant_invariant = 0;
1115                      dbytes2=((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_high / 100.0);  
1116                  }else{          if (create->num_zones == 0) {
1117                                  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++) {
1118                            rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1119                            rc->stats[j].weight = 1.0;
1120                  }                  }
1121                    n += rc->num_frames;
1122              }              }
1123    
1124              if (s->type == XVID_TYPE_BVOP) {  
1125                              dbytes2 *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];          for(i=0; i < create->num_zones; i++) {
1126                              if (dbytes2 < rc->min_length[XVID_TYPE_BVOP-1])  
1127                                      dbytes2 = rc->min_length[XVID_TYPE_BVOP-1];                  int next = (i+1<create->num_zones) ? create->zones[i+1].frame : rc->num_frames;
1128              }else{  
1129                              if (dbytes2 < rc->min_length[XVID_TYPE_PVOP-1])                  /* Zero weight make no sense */
1130                                      dbytes2 = rc->min_length[XVID_TYPE_PVOP-1];                  if (create->zones[i].increment == 0) create->zones[i].increment = 1;
1131                    /* And obviously an undetermined infinite makes even less sense */
1132                    if (create->zones[i].base == 0) create->zones[i].base = 1;
1133    
1134                    if (i==0 && create->zones[i].frame > 0) {
1135                            for (j = 0; j < create->zones[i].frame && j < rc->num_frames; j++) {
1136                                    rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1137                                    rc->stats[j].weight = 1.0;
1138                            }
1139                            n += create->zones[i].frame;
1140                    }
1141    
1142                    if (create->zones[i].mode == XVID_ZONE_WEIGHT) {
1143                            for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {
1144                                    rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1145                                    rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;
1146                            }
1147                            next -= create->zones[i].frame;
1148                            n += next;
1149                    } else{  /* XVID_ZONE_QUANT */
1150                            for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {
1151                                    rc->stats[j].zone_mode = XVID_ZONE_QUANT;
1152                                    rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;
1153                                    rc->tot_quant += rc->stats[j].length;
1154                                    rc->tot_quant_invariant += rc->stats[j].invariant;
1155                            }
1156              }              }
             total2 += dbytes2;  
1157          }          }
1158      }      }
1159    
     rc->curve_comp_scale = total1 / total2;  
1160    
1161      if (!rc->param.use_alt_curve) {  /* scale the curve */
1162          DPRINTF(XVID_DEBUG_RC, "middle frame size for asymmetric curve compression: %i\n",  static void
1163              (int)(rc->avg_length[XVID_TYPE_PVOP-1] * rc->curve_comp_scale));  first_pass_scale_curve_internal(rc_2pass2_t *rc)
1164    {
1165            int64_t target;
1166            int64_t total_invariant;
1167            double scaler;
1168            int i, num_MBs;
1169    
1170            /* We only scale texture data ! */
1171            total_invariant  = rc->tot_invariant[XVID_TYPE_IVOP-1];
1172            total_invariant += rc->tot_invariant[XVID_TYPE_PVOP-1];
1173            total_invariant += rc->tot_invariant[XVID_TYPE_BVOP-1];
1174            /* don't forget to substract header bytes used in quant zones, otherwise we
1175             * counting them twice */
1176            total_invariant -= rc->tot_quant_invariant;
1177    
1178            /* We remove the bytes used by the fixed quantizer zones during first pass
1179             * with the same quants, so we know very precisely how much that
1180             * represents */
1181            target  = rc->target;
1182            target -= rc->tot_quant;
1183    
1184            /* Let's compute a linear scaler in order to perform curve scaling */
1185            scaler = (double)(target - total_invariant) / (double)(rc->tot_weighted);
1186    
1187    #ifdef SMART_OVERFLOW_SETTING
1188            if (scaler > 0.9) {
1189                    rc->param.max_overflow_degradation *= 5;
1190                    rc->param.max_overflow_improvement *= 5;
1191                    rc->param.overflow_control_strength *= 3;
1192            } else if (scaler > 0.6) {
1193                    rc->param.max_overflow_degradation *= 2;
1194                    rc->param.max_overflow_improvement *= 2;
1195                    rc->param.overflow_control_strength *= 2;
1196            } else {
1197                    rc->min_quant = 2;
1198            }
1199    #endif
1200    
1201            /* Compute min frame lengths (for each frame type) according to the number
1202             * of MBs. We sum all block type counters of frame 0, this gives us the
1203             * number of MBs.
1204             *
1205             * We compare these hardcoded values with observed values in first pass
1206             * (determined in pre_process0).Then we keep the real minimum. */
1207    
1208            /* Number of MBs */
1209            num_MBs  = rc->stats[0].blks[0];
1210            num_MBs += rc->stats[0].blks[1];
1211            num_MBs += rc->stats[0].blks[2];
1212    
1213            /* Minimum for I frames */
1214            if(rc->min_length[XVID_TYPE_IVOP-1] > ((num_MBs*22) + 240) / 8)
1215                    rc->min_length[XVID_TYPE_IVOP-1] = ((num_MBs*22) + 240) / 8;
1216    
1217            /* Minimum for P/S frames */
1218            if(rc->min_length[XVID_TYPE_PVOP-1] > ((num_MBs) + 88)  / 8)
1219                    rc->min_length[XVID_TYPE_PVOP-1] = ((num_MBs) + 88)  / 8;
1220    
1221            /* Minimum for B frames */
1222            if(rc->min_length[XVID_TYPE_BVOP-1] > 8)
1223                    rc->min_length[XVID_TYPE_BVOP-1] = 8;
1224    
1225            /* Perform an initial scale pass.
1226             *
1227             * If a frame size is scaled underneath our hardcoded minimums, then we
1228             * force the frame size to the minimum, and deduct the original & scaled
1229             * frame length from the original and target total lengths */
1230            for (i=0; i<rc->num_frames; i++) {
1231                    twopass_stat_t * s = &rc->stats[i];
1232                    int len;
1233    
1234                    /* No need to scale frame length for which a specific quantizer is
1235                     * specified thanks to zones */
1236                    if (s->zone_mode == XVID_ZONE_QUANT) {
1237                            s->scaled_length = s->length;
1238                            continue;
1239      }      }
1240    
1241      if (rc->param.use_alt_curve) {                  /* Compute the scaled length -- only non invariant data length is scaled */
1242          int bonus_bias = rc->param.alt_curve_bonus_bias;                  len = s->invariant + (int)((double)(s->length-s->invariant) * scaler * s->weight);
         int oldquant = 1;  
   
             if (rc->param.alt_curve_use_auto_bonus_bias)  
                     bonus_bias = rc->param.alt_curve_min_rel_qual;  
1243    
1244              rc->alt_curve_curve_bias_bonus = (total1 - total2) * (double)bonus_bias / 100.0 / (double)(rc->num_frames /* - credits_frames */ - rc->num_keyframes);                  /* Compare with the computed minimum */
1245              rc->curve_comp_scale = ((total1 - total2) * (1.0 - (double)bonus_bias / 100.0) + total2) / total2;                  if (len < rc->min_length[s->type-1]) {
1246                            /* This is a 'forced size' frame, set its frame size to the
1247                             * computed minimum */
1248                            s->scaled_length = rc->min_length[s->type-1];
1249    
1250                            /* Remove both scaled and original size from their respective
1251                             * total counters, as we prepare a second pass for 'regular'
1252                             * frames */
1253                            target -= s->scaled_length;
1254                    } else {
1255                            /* Do nothing for now, we'll scale this later */
1256                            s->scaled_length = 0;
1257                    }
1258            }
1259    
1260          /* special info for alt curve:  bias bonus and quantizer thresholds */          /* The first pass on data substracted all 'forced size' frames from the
1261             * total counters. Now, it's possible to scale the 'regular' frames. */
1262    
1263                  DPRINTF(XVID_DEBUG_RC, "avg scaled framesize:%i", (int)rc->avg_length[XVID_TYPE_PVOP-1]);          /* Scaling factor for 'regular' frames */
1264                  DPRINTF(XVID_DEBUG_RC, "bias bonus:%i bytes", (int)rc->alt_curve_curve_bias_bonus);          scaler = (double)(target - total_invariant) / (double)(rc->tot_weighted);
1265    
1266                  for (i=1; i <= (int)(rc->alt_curve_high*2)+1; i++) {          /* Do another pass with the new scaler */
1267              double curve_temp, dbytes;          for (i=0; i<rc->num_frames; i++) {
1268              int newquant;                  twopass_stat_t * s = &rc->stats[i];
1269    
1270              dbytes = i;                  /* Ignore frame with forced frame sizes */
1271                          if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                  if (s->scaled_length == 0)
1272                  if (dbytes >= rc->alt_curve_high) {                          s->scaled_length = s->invariant + (int)((double)(s->length-s->invariant) * scaler * s->weight);
                                         curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev);  
                 }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))));  
1273                                          }                                          }
1274    
1275            /* Job done */
1276            return;
1277                                  }                                  }
1278                          }else{  
1279                  if (dbytes <= rc->alt_curve_low) {  /* Apply all user settings to the scaled curve
1280                                          curve_temp = dbytes;   * This implies:
1281                  }else{   *   keyframe boosting
1282                                          switch(rc->param.alt_curve_type)   *   high/low compression */
1283    static void
1284    scaled_curve_apply_advanced_parameters(rc_2pass2_t * rc)
1285                                          {                                          {
1286                                          case XVID_CURVE_SINE :          int i;
1287                                                  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)));          int64_t ivop_boost_total;
                                                 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))));  
                                         }  
                                 }  
                         }  
1288    
1289                          if (rc->movie_curve > 1.0)          /* Reset the rate controller (per frame type) total byte counters */
1290                                  dbytes *= rc->movie_curve;          for (i=0; i<3; i++) rc->tot_scaled_length[i] = 0;
1291    
1292                          newquant = (int)(dbytes * 2.0 / (curve_temp * rc->curve_comp_scale + rc->alt_curve_curve_bias_bonus));          /* Compute total bytes for each frame type */
1293                          if (newquant > 1) {          for (i=0; i<rc->num_frames;i++) {
1294                                  if (newquant != oldquant) {                  twopass_stat_t *s = &rc->stats[i];
1295                      int percent = (int)((i - rc->avg_length[XVID_TYPE_PVOP-1]) * 100.0 / rc->avg_length[XVID_TYPE_PVOP-1]);                  rc->tot_scaled_length[s->type-1] += s->scaled_length;
                                         oldquant = newquant;  
                                         DPRINTF(XVID_DEBUG_RC, "quant:%i threshold at %i : %i percent", newquant, i, percent);  
                                 }  
                         }  
1296                  }                  }
1297    
1298      }          /* First we compute the total amount of bits needed, as being described by
1299             * the scaled distribution. During this pass over the complete stats data,
1300             * we see how much bits two user settings will get/give from/to p&b frames:
1301             *  - keyframe boosting
1302             *  - keyframe distance penalty */
1303            rc->KF_idx = 0;
1304            ivop_boost_total = 0;
1305            for (i=0; i<rc->num_frames; i++) {
1306                    twopass_stat_t * s = &rc->stats[i];
1307    
1308      rc->overflow = 0;                  /* Some more work is needed for I frames */
1309      rc->KFoverflow = 0;                  if (s->type == XVID_TYPE_IVOP) {
1310      rc->KFoverflow_partial = 0;                          int ivop_boost;
     rc->KF_idx = 1;  
 }  
1311    
1312                            /* Accumulate bytes needed for keyframe boosting */
1313                            ivop_boost = s->scaled_length*rc->param.keyframe_boost/100;
1314    
1315    #if 0 /* ToDo: decide how to apply kfthresholding */
1316    #endif
1317                            /* If the frame size drops under the minimum length, then cap ivop_boost */
1318                            if (ivop_boost + s->scaled_length < rc->min_length[XVID_TYPE_IVOP-1])
1319                                    ivop_boost = rc->min_length[XVID_TYPE_IVOP-1] - s->scaled_length;
1320    
1321                            /* Accumulate the ivop boost */
1322                            ivop_boost_total += ivop_boost;
1323    
1324  static int rc_2pass2_create(xvid_plg_create_t * create, rc_2pass2_t ** handle)                          /* Don't forget to update the keyframe index */
1325  {                          rc->KF_idx++;
1326      xvid_plugin_2pass2_t * param = (xvid_plugin_2pass2_t *)create->param;                  }
1327      rc_2pass2_t * rc;          }
     int i;  
1328    
1329      rc = malloc(sizeof(rc_2pass2_t));          /* Initialize the IBoost tax ratio for P/S/B frames
1330      if (rc == NULL)           *
1331          return XVID_ERR_MEMORY;           * This ratio has to be applied to p/b/s frames in order to reserve
1332             * additional bits for keyframes (keyframe boosting) or if too much
1333             * keyframe distance is applied, bits retrieved from the keyframes.
1334             *
1335             * ie pb_length *= rc->pb_iboost_tax_ratio;
1336             *
1337             *    gives the ideal length of a p/b frame */
1338    
1339      rc->param = *param;          /* Compute the total length of p/b/s frames (temporary storage into
1340             * movie_curve) */
1341            rc->pb_iboost_tax_ratio  = (double)rc->tot_scaled_length[XVID_TYPE_PVOP-1];
1342            rc->pb_iboost_tax_ratio += (double)rc->tot_scaled_length[XVID_TYPE_BVOP-1];
1343    
1344            /* Compute the ratio described above
1345             *     taxed_total = sum(0, n, tax*scaled_length)
1346             * <=> taxed_total = tax.sum(0, n, scaled_length)
1347             * <=> tax = taxed_total / original_total */
1348            rc->pb_iboost_tax_ratio =
1349                    (rc->pb_iboost_tax_ratio - ivop_boost_total) /
1350                    rc->pb_iboost_tax_ratio;
1351    
1352      if (rc->param.keyframe_boost <= 0) rc->param.keyframe_boost = 0;          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- IFrame boost tax ratio:%.2f\n",
1353      if (rc->param.payback_method <= 0) rc->param.payback_method = XVID_PAYBACK_PROP;                          rc->pb_iboost_tax_ratio);
     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;  
1354    
1355      if (!det_stats_length(rc, param->filename)){          /* Compute the average size of frames per frame type */
1356          DPRINTF(XVID_DEBUG_RC,"fopen %s failed\n", param->filename);          for(i=0; i<3; i++) {
1357          free(rc);                  /* Special case for missing type or weird case */
1358          return XVID_ERR_FAIL;                  if (rc->count[i] == 0 || rc->pb_iboost_tax_ratio == 0) {
1359      }                          rc->avg_length[i] = 1;
1360                    } else {
1361                            rc->avg_length[i] = rc->tot_scaled_length[i];
1362    
1363      if ((rc->stats = malloc(rc->num_frames * sizeof(stat_t))) == NULL) {                          if (i == (XVID_TYPE_IVOP-1)) {
1364          free(rc);                                  /* I Frames total has to be added the boost total */
1365          return XVID_ERR_MEMORY;                                  rc->avg_length[i] += ivop_boost_total;
1366                            } else {
1367                                    /* P/B frames has to taxed */
1368                                    rc->avg_length[i] *= rc->pb_iboost_tax_ratio;
1369      }      }
1370    
1371      /* XXX: do we need an addition location */                          /* Finally compute the average frame size */
1372      if ((rc->keyframe_locations = malloc((rc->num_keyframes + 1) * sizeof(int))) == NULL) {                          rc->avg_length[i] /= (double)rc->count[i];
         free(rc->stats);  
         free(rc);  
         return XVID_ERR_MEMORY;  
1373      }      }
   
     if (!load_stats(rc, param->filename)) {  
         DPRINTF(XVID_DEBUG_RC,"fopen %s failed\n", param->filename);  
         free(rc->keyframe_locations);  
         free(rc->stats);  
         free(rc);  
         return XVID_ERR_FAIL;  
1374      }      }
1375    
1376      /* pre-process our stats */          /* Assymetric curve compression */
1377            if (rc->param.curve_compression_high || rc->param.curve_compression_low) {
1378                    double symetric_total;
1379                    double assymetric_delta_total;
1380    
1381          if (rc->num_frames  < create->fbase/create->fincr) {                  /* Like I frame boosting, assymetric curve compression modifies the total
1382                  rc->target = rc->param.bitrate / 8;     /* one second */                   * amount of needed bits, we must compute the ratio so we can prescale
1383          }else{                   lengths */
1384                  rc->target = (rc->param.bitrate * rc->num_frames * create->fincr) / (create->fbase * 8);                  symetric_total = 0;
1385          }                  assymetric_delta_total = 0;
1386                    for (i=0; i<rc->num_frames; i++) {
1387                            double assymetric_delta;
1388                            double dbytes;
1389                            twopass_stat_t * s = &rc->stats[i];
1390    
1391      DPRINTF(XVID_DEBUG_RC, "rc->target : %i\n", rc->target);                          /* I Frames are not concerned by assymetric scaling */
1392                            if (s->type == XVID_TYPE_IVOP)
1393                                    continue;
1394    
1395          rc->target -= rc->num_frames*24;        /* avi file header */                          /* During the real run, we would have to apply the iboost tax */
1396                            dbytes = s->scaled_length * rc->pb_iboost_tax_ratio;
1397    
1398                            /* Update the symmetric curve compression total */
1399                            symetric_total += dbytes;
1400    
1401          pre_process0(rc);                          /* Apply assymetric curve compression */
1402                            if (dbytes > rc->avg_length[s->type-1])
1403                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * (double)rc->param.curve_compression_high / 100.0f;
1404                            else
1405                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * (double)rc->param.curve_compression_low  / 100.0f;
1406    
1407          if (rc->param.bitrate) {                          /* Cap to the minimum frame size if needed */
1408          zone_process(rc, create);                          if (dbytes + assymetric_delta < rc->min_length[s->type-1])
1409                  internal_scale(rc);                                  assymetric_delta = rc->min_length[s->type-1] - dbytes;
     }else{  
         /* external scaler: ignore zone */  
         for (i=0;i<rc->num_frames;i++) {  
             rc->stats[i].zone_mode = XVID_ZONE_WEIGHT;  
             rc->stats[i].weight = 1.0;  
         }  
         rc->avg_weight = 1.0;  
         rc->tot_quant = 0;  
     }  
         pre_process1(rc);  
1410    
1411      for (i=0; i<32;i++) {                          /* Accumulate after assymetric curve compression */
1412          rc->pquant_error[i] = 0;                          assymetric_delta_total += assymetric_delta;
         rc->bquant_error[i] = 0;  
         rc->quant_count[i] = 0;  
1413      }      }
1414    
1415      rc->fq_error = 0;                  /* Compute the tax that all p/b frames have to pay in order to respect the
1416                     * bit distribution changes that the assymetric compression curve imposes
1417      *handle = rc;                   * We want assymetric_total = sum(0, n-1, tax.scaled_length)
1418          return(0);                   *      ie assymetric_total = ratio.sum(0, n-1, scaled_length)
1419                     *         ratio = assymetric_total / symmetric_total */
1420                    rc->assymetric_tax_ratio = ((double)symetric_total - (double)assymetric_delta_total) / (double)symetric_total;
1421            } else {
1422                    rc->assymetric_tax_ratio = 1.0f;
1423  }  }
1424    
1425            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Assymetric tax ratio:%.2f\n", rc->assymetric_tax_ratio);
1426    
1427  static int rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy)          /* Last bits that need to be reset */
1428  {          rc->overflow = 0;
1429      free(rc->keyframe_locations);          rc->KFoverflow = 0;
1430      free(rc->stats);          rc->KFoverflow_partial = 0;
1431          free(rc);          rc->KF_idx = 0;
1432          return(0);          rc->desired_total = 0;
1433            rc->real_total = 0;
1434    
1435            /* Job done */
1436            return;
1437  }  }
1438    
1439    /*****************************************************************************
1440     * VBV compliancy check and scale
1441     * MPEG-4 standard specifies certain restrictions for bitrate/framesize in VBR
1442     * to enable playback on devices with limited readspeed and memory (and which
1443     * aren't...)
1444     *
1445     * DivX profiles have 2 criteria: VBV as in MPEG standard
1446     *                                a limit on peak bitrate for any 3 seconds
1447     *
1448     * But if VBV is fulfilled, peakrate is automatically fulfilled in any profile
1449     * define so far, so we check for it (for completeness) but correct only VBV
1450     *
1451     *****************************************************************************/
1452    
1453    #define VBV_COMPLIANT 0
1454    #define VBV_UNDERFLOW 1 /* video buffer runs empty */
1455    #define VBV_OVERFLOW 2  /* doesn't exist for VBR encoding */
1456    #define VBV_PEAKRATE 4  /* peak bitrate (within 3s) violated */
1457    
1458  static int rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)  static int check_curve_for_vbv_compliancy(rc_2pass2_t * rc, const float fps)
1459  {  {
1460      stat_t * s = &rc->stats[data->frame_num];  /* We do all calculations in float, for higher accuracy,
1461      int overflow;     and in bytes for convenience
     int desired;  
     double dbytes;  
     double curve_temp;  
     int capped_to_max_framesize = 0;  
   
     if (data->quant <= 0) {  
1462    
1463          if (s->zone_mode == XVID_ZONE_QUANT) {     typical values from DivX Home Theater profile:
1464       vbv_size= 384*1024 (384kB), vbv_initial= 288*1024 (75% fill)
1465       maxrate= 4000000 (4MBps), peakrate= 10000000 (10MBps)
1466    
1467              rc->fq_error += s->weight;     PAL: offset3s = 75 (3 seconds of 25fps)
1468              data->quant = (int)rc->fq_error;     NTSC: offset3s = 90 (3 seconds of 29.97fps) or 72 (3 seconds of 23.976fps)
1469              rc->fq_error -= data->quant;  */
1470    
1471              s->desired_length = s->length;    const float vbv_size = (float)rc->param.vbv_size/8.f;
1472      float vbvfill = (float)rc->param.vbv_initial/8.f;
1473    
1474          }else { /* XVID_ZONE_WEIGHT */    const float maxrate = (float)rc->param.vbv_maxrate;
1475      const float peakrate = (float)rc->param.vbv_peakrate;
1476      const float r0 = (int)(maxrate/fps+0.5)/8.f;
1477    
1478              if (data->frame_num >= rc->num_frames) {    int bytes3s = 0;
1479                  /* insufficent stats data */    int offset3s = (int)(3.f*fps+0.5);
                 return 0;  
             }  
1480    
1481              overflow = rc->overflow / 8;        /* XXX: why by 8 */    int i;
1482      for (i=0; i<rc->num_frames; i++) {
1483    /* DivX 3s peak bitrate check  */
1484    
1485              if (s->type == XVID_TYPE_IVOP) {        /* XXX: why */      bytes3s += rc->stats[i].scaled_length;
1486                  overflow = 0;      if (i>=offset3s)
1487              }        bytes3s -= rc->stats[i-offset3s].scaled_length;
1488    
1489              desired = s->scaled_length;      if (8.f*bytes3s > 3*peakrate)
1490          return VBV_PEAKRATE;
1491    
1492              dbytes = desired;  /* update vbv fill level */
             if (s->type == XVID_TYPE_IVOP) {  
                 dbytes += desired * rc->param.keyframe_boost / 100;  
             }  
             dbytes /= rc->movie_curve;  
1493    
1494              if (s->type == XVID_TYPE_BVOP) {      vbvfill += r0 - rc->stats[i].scaled_length;
                 dbytes *= rc->avg_length[XVID_TYPE_PVOP-1] / rc->avg_length[XVID_TYPE_BVOP-1];  
             }  
1495    
1496              if (rc->param.payback_method == XVID_PAYBACK_BIAS) {  /* this check is _NOT_ an "overflow"! only reading from disk stops then */
1497                  desired =(int)(rc->curve_comp_error / rc->param.bitrate_payback_delay);      if (vbvfill > vbv_size)
1498              }else{        vbvfill = vbv_size;
                         //printf("desired=%i, dbytes=%i\n", desired,dbytes);  
                         desired = (int)(rc->curve_comp_error * dbytes /  
                                 rc->avg_length[XVID_TYPE_PVOP-1] / rc->param.bitrate_payback_delay);  
                         //printf("desired=%i\n", desired);  
1499    
1500                          if (labs(desired) > fabs(rc->curve_comp_error)) {  /* but THIS would be an underflow. report it! */
1501                                  desired = (int)rc->curve_comp_error;      if (vbvfill < 0)
1502          return VBV_UNDERFLOW;
1503                          }                          }
1504    
1505      return VBV_COMPLIANT;
1506              }              }
1507    /* TODO: store min(vbvfill) and print "minimum buffer fill" */
1508    
             rc->curve_comp_error -= desired;  
1509    
1510              /* alt curve */  static int scale_curve_for_vbv_compliancy(rc_2pass2_t * rc, const float fps)
1511    {
1512    /* correct any VBV violations. Peak bitrate violations disappears
1513       by this automatically
1514    
1515              curve_temp = 0; /* XXX: warning */     This implementation follows
1516    
1517              if (rc->param.use_alt_curve) {     Westerink, Rajagopalan, Gonzales "Two-pass MPEG-2 variable-bitrate encoding"
1518                  if (s->type != XVID_TYPE_IVOP)  {     IBM J. RES. DEVELOP. VOL 43, No. 4, July 1999, p.471--488
                     if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {  
                         if (dbytes >= rc->alt_curve_high) {  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev);  
                         }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];  
1519    
1520                                  curve_temp = curve_temp * rc->curve_comp_scale + rc->alt_curve_curve_bias_bonus;     Thanks, guys! This paper rocks!!!
1521    */
1522    
1523                                  desired += ((int)curve_temp);  /*
1524                                  rc->curve_comp_error += curve_temp - (int)curve_temp;      For each scene of len N, we have to check up to N^2 possible buffer fills.
1525                          }else{      This works well with MPEG-2 where N==12 or so, but for MPEG-4 it's a
1526                                  if (s->type == XVID_TYPE_BVOP)      little slow...
                                         dbytes *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
1527    
1528                                  desired += ((int)dbytes);      TODO: Better control on VBVfill between scenes
1529                                  rc->curve_comp_error += dbytes - (int)dbytes;  */
                         }  
1530    
1531              }else if ((rc->param.curve_compression_high + rc->param.curve_compression_low) &&   s->type != XVID_TYPE_IVOP) {    const float vbv_size = (float)rc->param.vbv_size/8.f;
1532      const float vbv_initial = (float)rc->param.vbv_initial/8.f;
1533    
1534                  curve_temp = rc->curve_comp_scale;    const float maxrate = 0.9*rc->param.vbv_maxrate;
1535                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {    const float vbv_low = 0.10f*vbv_size;
1536                      curve_temp *= ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_high / 100.0);    const float r0 = (int)(maxrate/fps+0.5)/8.f;
1537                  } else {  
1538                      curve_temp *= ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_low / 100.0);    int i,k,l,n,violation = 0;
1539      float *scenefactor;
1540      int *scenestart;
1541      int *scenelength;
1542    
1543    /* first step: determine how many "scenes" there are and store their boundaries
1544       we could get all this from existing keyframe_positions, somehow, but there we
1545       don't have a min_scenelength, and it's no big deal to get it again.  */
1546    
1547      const int min_scenelength = (int)(fps+0.5);
1548      int num_scenes = 0;
1549      int last_scene = -999;
1550      for (i=0; i<rc->num_frames; i++) {
1551        if ( (rc->stats[i].type == XVID_TYPE_IVOP) && (i-last_scene>min_scenelength) )
1552        {
1553          last_scene = i;
1554          num_scenes++;
1555                  }                  }
   
                 if (s->type == XVID_TYPE_BVOP){  
                     curve_temp *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
1556                  }                  }
1557    
1558                  desired += (int)curve_temp;    scenefactor = (float*)malloc( num_scenes*sizeof(float) );
1559                  rc->curve_comp_error += curve_temp - (int)curve_temp;    scenestart = (int*)malloc( num_scenes*sizeof(int) );
1560              }else{    scenelength = (int*)malloc( num_scenes*sizeof(int) );
                 if (s->type == XVID_TYPE_BVOP){  
                                 dbytes *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
                 }  
1561    
1562                          desired += (int)dbytes;    if ((!scenefactor) || (!scenestart) || (!scenelength) )
1563                          rc->curve_comp_error += dbytes - (int)dbytes;    {
1564        free(scenefactor);
1565        free(scenestart);
1566        free(scenelength);
1567        /* remember: free(0) is valid and does exactly nothing. */
1568        return -1;
1569              }              }
1570    
1571    /* count again and safe the length/position */
1572    
1573                  if (desired > s->length) {  /* if desired length exceeds the pass1 length.. */    num_scenes = 0;
1574                          rc->curve_comp_error += desired - s->length;    last_scene = -999;
1575                          desired = s->length;    for (i=0; i<rc->num_frames; i++) {
1576                  }else{      if ( (rc->stats[i].type == XVID_TYPE_IVOP) && (i-last_scene>min_scenelength) )
1577                  if (desired < rc->min_length[s->type-1]) {      {
1578                      if (s->type == XVID_TYPE_IVOP){        if (num_scenes>0)
1579                          rc->curve_comp_error -= rc->min_length[XVID_TYPE_IVOP-1] - desired;          scenelength[num_scenes-1]=i-last_scene;
1580                      }        scenestart[num_scenes]=i;
1581                      desired = rc->min_length[s->type-1];        num_scenes++;
1582          last_scene = i;
1583                  }                  }
1584                  }                  }
1585      scenelength[num_scenes-1]=i-last_scene;
1586    
1587              s->desired_length = desired;  /* second step: check for each scene, how much we can scale its frames up or down
1588       such that the VBV restriction is just fulfilled
1589    */
             /* if this keyframe is too close to the next, reduce it's byte allotment  
             XXX: why do we do this after setting the desired length  */  
1590    
                 if (s->type == XVID_TYPE_IVOP) {  
                         int KFdistance = rc->keyframe_locations[rc->KF_idx] - rc->keyframe_locations[rc->KF_idx - 1];  
1591    
1592                  if (KFdistance < rc->param.kftreshold) {  #define R(k,n) (((n)+1-(k))*r0)     /* how much enters the buffer between frame k and n */
1593      for (l=0; l<num_scenes;l++)
1594      {
1595        const int start = scenestart[l];
1596        const int length = scenelength[l];
1597        twopass_stat_t * frames = &rc->stats[start];
1598    
1599                      KFdistance = KFdistance - rc->param.min_key_interval;      float S0n,Skn;
1600        float f,minf = 99999.f;
1601    
1602                                  if (KFdistance >= 0) {      S0n=0.;
1603                          int KF_min_size;      for (n=0;n<=length-1;n++)
1604        {
1605          S0n += frames[n].scaled_length;
1606    
1607                                          KF_min_size = desired * (100 - rc->param.kfreduction) / 100;        k=0;
1608                                          if (KF_min_size < 1)        Skn = S0n;
1609                                                  KF_min_size = 1;        f = (R(k,n-1) + (vbv_initial - vbv_low)) / Skn;
1610          if (f < minf)
1611            minf = f;
1612    
1613                                          desired = KF_min_size + (desired - KF_min_size) * KFdistance /        for (k=1;k<=n;k++)
1614                                                  (rc->param.kftreshold - rc->param.min_key_interval);        {
1615            Skn -= frames[k].scaled_length;
1616    
1617                                          if (desired < 1)          f = (R(k,n-1) + (vbv_size - vbv_low)) / Skn;
1618                                                  desired = 1;          if (f < minf)
1619                                  }            minf = f;
1620                          }                          }
1621                  }                  }
1622    
1623              overflow = (int)((double)overflow * desired / rc->avg_length[XVID_TYPE_PVOP-1]);      /* special case: at the end, fill buffer up to vbv_initial again
1624           TODO: Allow other values for buffer fill between scenes
1625           e.g. if n=N is smallest f-value, then check for better value */
1626    
1627                  // Foxer: reign in overflow with huge frames      n=length;
1628                  if (labs(overflow) > labs(rc->overflow)) {      k=0;
1629                          overflow = rc->overflow;      Skn = S0n;
1630                  }      f = R(k,n-1)/Skn;
1631        if (f < minf)
1632          minf = f;
1633    
1634              // Foxer: make sure overflow doesn't run away      for (k=1;k<=n-1;k++)
1635        {
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) {  #ifdef VBV_DEBUG
1644                          capped_to_max_framesize = 1;      printf("Scene %d (Frames %d-%d): VBVfactor %f\n", l, start, start+length-1 , minf);
1645                          desired = rc->max_length;  #endif
                 }  
1646    
1647              // 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];  
1648              }              }
1649    #undef R
1650    
1651    /* last step: now we know of any scene how much it can be scaled up or down without
1652       violating VBV. Next, distribute bits from the evil scenes to the good ones */
1653    
1654              // very 'simple' quant<->filesize relationship    do
1655              data->quant= (s->quant * s->length) / desired;    {
1656        float S_red = 0.f;    /* how much to redistribute */
1657        float S_elig = 0.f;   /* sum of bit for those scenes you can still swallow something*/
1658            float f_red;
1659        int l;
1660    
1661                  if (data->quant < 1) {      for (l=0;l<num_scenes;l++)   /* check how much is wrong */
                         data->quant = 1;  
             } else if (data->quant > 31) {  
                         data->quant = 31;  
                 }  
                 else if (s->type != XVID_TYPE_IVOP)  
1662                  {                  {
1663                          // Foxer: aid desired quantizer precision by accumulating decision error      const int start = scenestart[l];
1664                          if (s->type== XVID_TYPE_BVOP) {      const int length = scenelength[l];
1665                                  rc->bquant_error[data->quant] += ((double)(s->quant * s->length) / desired) - data->quant;      twopass_stat_t * frames = &rc->stats[start];
1666    
1667                                  if (rc->bquant_error[data->quant] >= 1.0) {        if (scenefactor[l] == 1.) /* exactly 1 means "don't touch this anymore!" */
1668                                          rc->bquant_error[data->quant] -= 1.0;          continue;
                                         data->quant++;  
                                 }  
                         }else{  
                                 rc->pquant_error[data->quant] += ((double)(s->quant * s->length) / desired) - data->quant;  
1669    
1670                      if (rc->pquant_error[data->quant] >= 1.0) {        if (scenefactor[l] > 1.) /* within limits */
1671                                          rc->pquant_error[data->quant] -= 1.0;        {
1672                                          ++data->quant;          for (n= 0; n < length; n++)
1673              S_elig += frames[n].scaled_length;
1674          }
1675          else /* underflowing segment */
1676          {
1677            for (n= 0; n < length; n++)
1678            {
1679              float newbytes = (float)frames[n].scaled_length * scenefactor[l];
1680              S_red += (float)frames[n].scaled_length - (float)newbytes;
1681              frames[n].scaled_length =(int)newbytes;
1682                                  }                                  }
1683            scenefactor[l] = 1.f;
1684                          }                          }
1685                  }                  }
1686    
1687              /* cap to min/max quant */      if (S_red < 1.f)   /* no more underflows */
1688          break;
1689    
1690              if (data->quant < data->min_quant[s->type-1]) {      if (S_elig < 1.f)
1691                  data->quant = data->min_quant[s->type-1];      {
1692              }else if (data->quant > data->max_quant[s->type-1]) {  #ifdef VBV_DEBUG
1693                  data->quant = data->max_quant[s->type-1];        fprintf(stderr,"Everything underflowing. \n");
1694    #endif
1695          free(scenefactor);
1696          free(scenestart);
1697          free(scenelength);
1698          return -2;
1699              }              }
1700    
1701              /* 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) {  
1702    
1703                          if (data->quant > rc->last_quant[s->type-1] + 2) {  #ifdef VBV_DEBUG
1704                                  data->quant = rc->last_quant[s->type-1] + 2;      printf("Moving %.0f kB to avoid buffer underflow, correction factor: %.5f\n",S_red/1024.f,f_red);
1705                                  DPRINTF(XVID_DEBUG_RC, "p/b-frame quantizer prevented from rising too steeply");  #endif
                         }  
                         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");  
                         }  
                 }  
1706    
1707                  if (capped_to_max_framesize == 0) {      violation=0;
1708                  rc->last_quant[s->type-1] = data->quant;      for (l=0; l<num_scenes; l++)   /* scale remaining scenes up to meet total size */
1709                  }      {
1710          const int start = scenestart[l];
1711          const int length = scenelength[l];
1712          twopass_stat_t * frames = &rc->stats[start];
1713    
1714          if (scenefactor[l] == 1.)
1715            continue;
1716    
1717          }   /* if */        /* there shouldn't be any segments with factor<1 left, so all the rest is >1 */
1718    
1719          for (n= 0; n < length; n++)
1720          {
1721            frames[n].scaled_length = (int)(frames[n].scaled_length * f_red + 0.5);
1722      }      }
1723    
1724      return 0;        scenefactor[l] /= f_red;
1725          if (scenefactor[l] < 1.f)
1726            violation=1;
1727  }  }
1728    
1729      } while (violation);
1730    
1731      free(scenefactor);
1732  static int rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)    free(scenestart);
1733  {    free(scenelength);
     stat_t * s = &rc->stats[data->frame_num];  
   
     if (data->frame_num >= rc->num_frames) {  
         /* insufficent stats data */  
1734          return 0;          return 0;
1735      }      }
1736    
     rc->quant_count[data->quant]++;  
1737    
1738      if (data->type == XVID_TYPE_IVOP) {  /*****************************************************************************
1739          int kfdiff = (rc->keyframe_locations[rc->KF_idx] -      rc->keyframe_locations[rc->KF_idx - 1]);   * Still more low level stuff (nothing to do with stats treatment)
1740     ****************************************************************************/
1741    
1742    /* This function returns an allocated string containing a complete line read
1743     * from the file starting at the current position */
1744    static char *
1745    readline(FILE *f)
1746    {
1747            char *buffer = NULL;
1748            int buffer_size = 0;
1749            int pos = 0;
1750    
1751          rc->overflow += rc->KFoverflow;          do {
1752          rc->KFoverflow = s->desired_length - data->length;                  int c;
1753    
1754          if (kfdiff > 1) {  // non-consecutive keyframes                  /* Read a character from the stream */
1755              rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);                  c = fgetc(f);
1756          }else{ // consecutive keyframes  
1757                          rc->overflow += rc->KFoverflow;                  /* Is that EOF or new line ? */
1758                          rc->KFoverflow = 0;                  if(c == EOF || c == '\n')
1759                          rc->KFoverflow_partial = 0;                          break;
1760          }  
1761          rc->KF_idx++;                  /* Do we have to update buffer ? */
1762      }else{                  if(pos >= buffer_size - 1) {
1763          // distribute part of the keyframe overflow                          buffer_size += BUF_SZ;
1764          rc->overflow += s->desired_length - data->length + rc->KFoverflow_partial;                          buffer = (char*)realloc(buffer, buffer_size);
1765          rc->KFoverflow -= rc->KFoverflow_partial;                          if (buffer == NULL)
1766                                    return(NULL);
1767      }      }
1768    
1769      DPRINTF(XVID_DEBUG_RC, "[%i] quant:%i stats1:%i scaled:%i actual:%i overflow:%i\n",                  buffer[pos] = c;
1770          data->frame_num,                  pos++;
1771          data->quant,          } while(1);
         s->length,  
         s->scaled_length,  
         data->length,  
         rc->overflow);  
1772    
1773      return(0);          /* Read \n or EOF */
1774            if (buffer == NULL) {
1775                    /* EOF, so we reached the end of the file, return NULL */
1776                    if(feof(f))
1777                            return(NULL);
1778    
1779                    /* Just an empty line with just a newline, allocate a 1 byte buffer to
1780                     * store a zero length string */
1781                    buffer = (char*)malloc(1);
1782                    if(buffer == NULL)
1783                            return(NULL);
1784  }  }
1785    
1786            /* Zero terminated string */
1787            buffer[pos] = '\0';
1788    
1789            return(buffer);
1790    }
1791    
1792  int xvid_plugin_2pass2(void * handle, int opt, void * param1, void * param2)  /* This function returns a pointer to the first non space char in the given
1793     * string */
1794    static char *
1795    skipspaces(char *string)
1796  {  {
1797      switch(opt)          const char spaces[] =
1798      {      {
1799      case XVID_PLG_INFO :                          ' ','\t','\0'
1800          return 0;                  };
1801            const char *spacechar = spaces;
1802    
1803            if (string == NULL) return(NULL);
1804    
1805            while (*string != '\0') {
1806                    /* Test against space chars */
1807                    while (*spacechar != '\0') {
1808                            if (*string == *spacechar) {
1809                                    string++;
1810                                    spacechar = spaces;
1811                                    break;
1812                            }
1813                            spacechar++;
1814                    }
1815    
1816      case XVID_PLG_CREATE :                  /* No space char */
1817          return rc_2pass2_create((xvid_plg_create_t*)param1, param2);                  if (*spacechar == '\0') return(string);
1818            }
1819    
1820      case XVID_PLG_DESTROY :          return(string);
1821          return rc_2pass2_destroy((rc_2pass2_t*)handle, (xvid_plg_destroy_t*)param1);  }
1822    
1823      case XVID_PLG_BEFORE :  /* This function returns a boolean that tells if the string is only a
1824          return rc_2pass2_before((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);   * comment */
1825    static int
1826    iscomment(char *string)
1827    {
1828            const char comments[] =
1829                    {
1830                            '#',';', '%', '\0'
1831                    };
1832            const char *cmtchar = comments;
1833            int iscomment = 0;
1834    
1835            if (string == NULL) return(1);
1836    
1837            string = skipspaces(string);
1838    
1839            while(*cmtchar != '\0') {
1840                    if(*string == *cmtchar) {
1841                            iscomment = 1;
1842                            break;
1843                    }
1844                    cmtchar++;
1845            }
1846    
1847      case XVID_PLG_AFTER :          return(iscomment);
         return rc_2pass2_after((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);  
1848      }      }
1849    
1850      return XVID_ERR_FAIL;  #if 0
1851    static void
1852    stats_print(rc_2pass2_t * rc)
1853    {
1854            int i;
1855            const char frame_type[4] = { 'i', 'p', 'b', 's'};
1856    
1857            for (i=0; i<rc->num_frames; i++) {
1858                    twopass_stat_t *s = &rc->stats[i];
1859                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- frame:%d type:%c quant:%d stats:%d scaled:%d desired:%d actual:%d overflow(%c):%.2f\n",
1860                                    i, frame_type[s->type-1], -1, s->length, s->scaled_length,
1861                                    s->desired_length, -1, frame_type[s->type-1], -1.0f);
1862  }  }
1863    }
1864    #endif
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