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revision 1.1.2.4, Fri May 16 17:19:51 2003 UTC revision 1.3, Thu Jun 10 18:13:42 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            /*----------------------------------
218  #define BUF_SZ 1024           * Debug
219  #define MAX_COLS    5           *--------------------------------*/
220            double desired_total;
221            double real_total;
222    } rc_2pass2_t;
223    
224    
225  /* open stats file, and count num frames */  /*****************************************************************************
226     * Sub plugin functions prototypes
227     ****************************************************************************/
228    
229    static int rc_2pass2_create(xvid_plg_create_t * create, rc_2pass2_t ** handle);
230    static int rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data);
231    static int rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data);
232    static int rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy);
233    
234    /*****************************************************************************
235     * Plugin definition
236     ****************************************************************************/
237    
238  static int det_stats_length(rc_2pass2_t * rc, char * filename)  int
239    xvid_plugin_2pass2(void * handle, int opt, void * param1, void * param2)
240  {  {
241      FILE * f;          switch(opt) {
242      int n, ignore;          case XVID_PLG_INFO :
243      char type;          case XVID_PLG_FRAME :
   
     rc->num_frames = 0;  
     rc->num_keyframes = 0;  
   
     if ((f = fopen(filename, "rt")) == NULL)  
244          return 0;          return 0;
245    
246      while((n = fscanf(f, "%c %d %d %d %d %d %d\n",          case XVID_PLG_CREATE :
247          &type, &ignore, &ignore, &ignore, &ignore, &ignore, &ignore)) != EOF) {                  return rc_2pass2_create((xvid_plg_create_t*)param1, param2);
         if (type == 'i') {  
             rc->num_frames++;  
             rc->num_keyframes++;  
         }else if (type == 'p' || type == 'b' || type == 's') {  
             rc->num_frames++;  
         }  
     }  
248    
249      fclose(f);          case XVID_PLG_DESTROY :
250                    return rc_2pass2_destroy((rc_2pass2_t*)handle, (xvid_plg_destroy_t*)param1);
251    
252            case XVID_PLG_BEFORE :
253                    return rc_2pass2_before((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);
254    
255      return 1;          case XVID_PLG_AFTER :
256                    return rc_2pass2_after((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);
257  }  }
258    
259            return XVID_ERR_FAIL;
260    }
261    
262    /*****************************************************************************
263     * Sub plugin functions definitions
264     ****************************************************************************/
265    
266    /* First a few local helping function prototypes */
267    static  int statsfile_count_frames(rc_2pass2_t * rc, char * filename);
268    static  int statsfile_load(rc_2pass2_t *rc, char * filename);
269    static void zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create);
270    static void first_pass_stats_prepare_data(rc_2pass2_t * rc);
271    static void first_pass_scale_curve_internal(rc_2pass2_t *rc);
272    static void scaled_curve_apply_advanced_parameters(rc_2pass2_t * rc);
273    static  int check_curve_for_vbv_compliancy(rc_2pass2_t * rc, const float fps);
274    static  int scale_curve_for_vbv_compliancy(rc_2pass2_t * rc, const float fps);
275    #if 0
276    static void stats_print(rc_2pass2_t * rc);
277    #endif
278    
279  /* open stats file(s) and read into rc->stats array */  /*----------------------------------------------------------------------------
280     *--------------------------------------------------------------------------*/
281    
282  static int load_stats(rc_2pass2_t *rc, char * filename)  static int
283    rc_2pass2_create(xvid_plg_create_t * create, rc_2pass2_t **handle)
284  {  {
285      FILE * f;          xvid_plugin_2pass2_t * param = (xvid_plugin_2pass2_t *)create->param;
286      int i, not_scaled;          rc_2pass2_t * rc;
287            int i;
288    
289            rc = malloc(sizeof(rc_2pass2_t));
290            if (rc == NULL)
291                    return XVID_ERR_MEMORY;
292    
293      if ((f = fopen(filename, "rt"))==NULL)          rc->param = *param;
         return 0;  
294    
295      i = 0;          /* Initialize all defaults */
296          not_scaled = 0;  #define _INIT(a, b) if((a) <= 0) (a) = (b)
297      while(i < rc->num_frames) {          /* Let's set our defaults if needed */
298          stat_t * s = &rc->stats[i];          _INIT(rc->param.keyframe_boost, DEFAULT_KEYFRAME_BOOST);
299          int n;          _INIT(rc->param.overflow_control_strength, DEFAULT_OVERFLOW_CONTROL_STRENGTH);
300          char type;          _INIT(rc->param.curve_compression_high, DEFAULT_CURVE_COMPRESSION_HIGH);
301            _INIT(rc->param.curve_compression_low, DEFAULT_CURVE_COMPRESSION_LOW);
302            _INIT(rc->param.max_overflow_improvement, DEFAULT_MAX_OVERFLOW_IMPROVEMENT);
303            _INIT(rc->param.max_overflow_degradation,  DEFAULT_MAX_OVERFLOW_DEGRADATION);
304    
305            /* Keyframe settings */
306            _INIT(rc->param.kfreduction, DEFAULT_KFREDUCTION);
307            _INIT(rc->param.kfthreshold, DEFAULT_KFTHRESHOLD);
308    #undef _INIT
309    
310                  s->scaled_length = 0;          /* Initialize some stuff to zero */
311          n = fscanf(f, "%c %d %d %d %d %d %d\n", &type, &s->quant, &s->blks[0], &s->blks[1], &s->blks[2], &s->length, &s->scaled_length);          for(i=0; i<3; i++) {
312          if (n == EOF) break;                  int j;
313                  if (n < 7) {                  for (j=0; j<32; j++) {
314                          not_scaled = 1;                          rc->quant_error[i][j] = 0;
315                            rc->quant_count[i][j] = 0;
316                  }                  }
   
         if (type == 'i') {  
             s->type = XVID_TYPE_IVOP;  
         }else if (type == 'p' || type == 's') {  
             s->type = XVID_TYPE_PVOP;  
         }else if (type == 'b') {  
             s->type = XVID_TYPE_BVOP;  
         }else{  /* unknown type */  
             printf("unk\n");  
             continue;  
317          }          }
318    
319          i++;          for (i=0; i<3; i++) rc->last_quant[i] = 0;
320    
321            rc->fq_error = 0;
322            rc->min_quant = 1;
323    
324            /* Count frames (and intra frames) in the stats file, store the result into
325             * the rc structure */
326            if (statsfile_count_frames(rc, param->filename) == -1) {
327                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- ERROR: fopen %s failed\n", param->filename);
328                    free(rc);
329                    return(XVID_ERR_FAIL);
330      }      }
     rc->num_frames = i;  
331    
332      fclose(f);          /* Allocate the stats' memory */
333            if ((rc->stats = malloc(rc->num_frames * sizeof(twopass_stat_t))) == NULL) {
334                    free(rc);
335                    return(XVID_ERR_MEMORY);
336            }
337    
338      return 1;          /* Allocate keyframes location's memory
339             * PS: see comment in pre_process0 for the +1 location requirement */
340            rc->keyframe_locations = malloc((rc->num_keyframes + 1) * sizeof(int));
341            if (rc->keyframe_locations == NULL) {
342                    free(rc->stats);
343                    free(rc);
344                    return(XVID_ERR_MEMORY);
345  }  }
346    
347            /* Load the first pass stats */
348            if (statsfile_load(rc, param->filename) == -1) {
349                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- ERROR: fopen %s failed\n", param->filename);
350                    free(rc->keyframe_locations);
351                    free(rc->stats);
352                    free(rc);
353                    return XVID_ERR_FAIL;
354            }
355    
356            /* Compute the target filesize */
357            if (rc->param.bitrate<0) {
358                    /* if negative, bitrate equals the target (in kbytes) */
359                    rc->target = ((uint64_t)(-rc->param.bitrate)) * 1024;
360            } else if (rc->num_frames  < create->fbase/create->fincr) {
361                    /* Source sequence is less than 1s long, we do as if it was 1s long */
362                    rc->target = rc->param.bitrate / 8;
363            } else {
364                    /* Target filesize = bitrate/8 * numframes / framerate */
365                    rc->target =
366                            ((uint64_t)rc->param.bitrate * (uint64_t)rc->num_frames * \
367                             (uint64_t)create->fincr) / \
368                            ((uint64_t)create->fbase * 8);
369            }
370    
371            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Frame rate: %d/%d (%ffps)\n",
372                            create->fbase, create->fincr,
373                            (double)create->fbase/(double)create->fincr);
374            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Number of frames: %d\n", rc->num_frames);
375            if(rc->param.bitrate>=0)
376                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Target bitrate: %ld\n", rc->param.bitrate);
377            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Target filesize: %lld\n", rc->target);
378    
379            /* Compensate the average frame overhead caused by the container */
380            rc->target -= rc->num_frames*rc->param.container_frame_overhead;
381            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Container Frame overhead: %d\n", rc->param.container_frame_overhead);
382            if(rc->param.container_frame_overhead)
383                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- New target filesize after container compensation: %lld\n", rc->target);
384    
385  static void print_stats(rc_2pass2_t * rc)          /* When bitrate is not given it means it has been scaled by an external
386  {           * application */
387      int i;          if (rc->param.bitrate) {
388                    /* Apply zone settings
389                     * - set rc->tot_quant which represents the total num of bytes spent in
390                     *   fixed quant zones
391                     * - set rc->tot_weighted which represents the total amount of bytes
392                     *   spent in normal or weighted zones in first pass (normal zones can
393                     *   be considered weight=1)
394                     * - set rc->tot_quant_invariant which represents the total num of bytes
395                     *   spent in fixed quant zones for headers */
396                    zone_process(rc, create);
397            } else {
398                    /* External scaling -- zones are ignored */
399      for (i = 0; i < rc->num_frames; i++) {      for (i = 0; i < rc->num_frames; i++) {
400          stat_t * s = &rc->stats[i];                          rc->stats[i].zone_mode = XVID_ZONE_WEIGHT;
401          printf("%i %i %i %i\n", s->type, s->quant, s->length, s->scaled_length);                          rc->stats[i].weight = 1.0;
   
402      }      }
403                    rc->tot_quant = 0;
404  }  }
405    
406            /* Gathers some information about first pass stats:
407  /* pre-process the statistics data           *  - finds the minimum frame length for each frame type during 1st pass.
408      - for each type, count, tot_length, min_length, max_length           *     rc->min_size[]
409      - set keyframes_locations           *  - determines the maximum frame length observed (no frame type distinction).
410             *     rc->max_size
411             *  - count how many times each frame type has been used.
412             *     rc->count[]
413             *  - total bytes used per frame type
414             *     rc->tot_length[]
415             *  - total bytes considered invariant between the 2 passes
416             *  - store keyframe location
417             *     rc->keyframe_locations[]
418  */  */
419            first_pass_stats_prepare_data(rc);
420    
421  void pre_process0(rc_2pass2_t * rc)          /* If we have a user bitrate, it means it's an internal curve scaling */
422  {          if (rc->param.bitrate) {
423      int i,j;                  /* Perform internal curve scaling */
424                    first_pass_scale_curve_internal(rc);
     for (i=0; i<3; i++) {  
         rc->count[i]=0;  
         rc->tot_length[i] = 0;  
         rc->last_quant[i] = 0;  
425      }      }
426    
427      for (i=j=0; i<rc->num_frames; i++) {          /* Apply advanced curve options, and compute some parameters in order to
428          stat_t * s = &rc->stats[i];           * shape the curve in the BEFORE/AFTER pair of functions */
429            scaled_curve_apply_advanced_parameters(rc);
         rc->count[s->type-1]++;  
         rc->tot_length[s->type-1] += s->length;  
430    
431          if (i == 0 || s->length < rc->min_length[s->type-1]) {  /* Check curve for VBV compliancy and rescale if necessary */
             rc->min_length[s->type-1] = s->length;  
         }  
432    
433          if (i == 0 || s->length > rc->max_length) {  #ifdef VBV_FORCE
434              rc->max_length = s->length;    if (rc->param.vbv_size==0)
435      {
436        rc->param.vbv_size      =  3145728;
437        rc->param.vbv_initial   =  2359296;
438        rc->param.vbv_maxrate  =  4000000;
439        rc->param.vbv_peakrate = 10000000;
440          }          }
441    #endif
442    
443          if (s->type == XVID_TYPE_IVOP) {    if (rc->param.vbv_size>0)    /* vbv_size==0 switches VBV check off */
444              rc->keyframe_locations[j] = i;    {
445              j++;      const double fps = (double)create->fbase/(double)create->fincr;
446          }      int status = check_curve_for_vbv_compliancy(rc, fps);
447    #ifdef VBV_DEBUG
448        if (status)
449          fprintf(stderr,"underflow detected\n Scaling Curve for compliancy... ");
450    #endif
451    
452            status = scale_curve_for_vbv_compliancy(rc, fps);
453    
454    #ifdef VBV_DEBUG
455          if (status==0)
456            fprintf(stderr,"done.\n");
457          else
458            fprintf(stderr,"impossible.\n");
459    #endif
460      }      }
461      rc->keyframe_locations[j] = i;          *handle = rc;
462            return(0);
463  }  }
464    
465    /*----------------------------------------------------------------------------
466     *--------------------------------------------------------------------------*/
467    
468  /* calculate zone weight "center" */  static int
469    rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy)
 static void zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)  
470  {  {
471      int i,j;          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- target_total:%lld desired_total:%.2f (%.2f%%) actual_total:%.2f (%.2f%%)\n",
472      int n = 0;                          rc->target,
473                            rc->desired_total,
474      rc->avg_weight = 0.0;                          100*rc->desired_total/(double)rc->target,
475      rc->tot_quant = 0;                          rc->real_total,
476                            100*rc->real_total/(double)rc->target);
477    
478      if (create->num_zones == 0) {          free(rc->keyframe_locations);
479          for (j = 0; j < rc->num_frames; j++) {          free(rc->stats);
480              rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;          free(rc);
481              rc->stats[j].weight = 1.0;          return(0);
         }  
         rc->avg_weight += rc->num_frames * 1.0;  
         n += rc->num_frames;  
482      }      }
483    
484    /*----------------------------------------------------------------------------
485     *--------------------------------------------------------------------------*/
486    
487      for(i=0; i < create->num_zones; i++) {  static int
488    rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)
489          int next = (i+1<create->num_zones) ? create->zones[i+1].frame : rc->num_frames;  {
490            twopass_stat_t * s = &rc->stats[data->frame_num];
491          if (i==0 && create->zones[i].frame > 0) {          double dbytes;
492              for (j = 0; j < create->zones[i].frame && j < rc->num_frames; j++) {          double scaled_quant;
493                  rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;          double overflow;
494                  rc->stats[j].weight = 1.0;          int capped_to_max_framesize = 0;
             }  
             rc->avg_weight += create->zones[i].frame * 1.0;  
             n += create->zones[i].frame;  
         }  
495    
496          if (create->zones[i].mode == XVID_ZONE_WEIGHT) {          /* This function is quite long but easy to understand. In order to simplify
497              for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {           * the code path (a bit), we treat 3 cases that can return immediatly. */
                 rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;  
                 rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;  
             }  
             next -= create->zones[i].frame;  
             rc->avg_weight += (double)(next * create->zones[i].increment) / (double)create->zones[i].base;  
             n += next;  
         }else{  // XVID_ZONE_QUANT  
             for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {  
                 rc->stats[j].zone_mode = XVID_ZONE_QUANT;  
                 rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;  
                 rc->tot_quant += rc->stats[j].length;  
             }  
         }  
     }  
     rc->avg_weight = n>0 ? rc->avg_weight/n : 1.0;  
498    
499      /*for (i=0; i < rc->num_frames; i++) {          /* First case: Another plugin has already set a quantizer */
500          printf("[%i] mode=%i weight=%f\n", i, rc->stats[i].zone_mode, rc->stats[i].weight);          if (data->quant > 0)
501      }*/                  return(0);
502    
503      printf("center_weight: %f (for %i frames);   fixed_bytes: %i\n", rc->avg_weight, n, rc->tot_quant);          /* Second case: insufficent stats data
504             * We can't guess much what we should do, let core decide all alone */
505            if (data->frame_num >= rc->num_frames) {
506                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- stats file too short (now processing frame %d)",
507                            data->frame_num);
508                    return(0);
509  }  }
510    
511            /* Third case: We are in a Quant zone
512             * Quant zones must just ensure we use the same settings as first pass
513             * So set the quantizer and the type */
514            if (s->zone_mode == XVID_ZONE_QUANT) {
515                    /* Quant stuff */
516                    rc->fq_error += s->weight;
517                    data->quant = (int)rc->fq_error;
518                    rc->fq_error -= data->quant;
519    
520  /* scale the curve */                  /* The type stuff */
521                    data->type = s->type;
 static void internal_scale(rc_2pass2_t *rc)  
 {  
         int64_t target  = rc->target - rc->tot_quant;  
         int64_t pass1_length = rc->tot_length[0] + rc->tot_length[1] + rc->tot_length[2] - rc->tot_quant;  
         int min_size[3];  
         double scaler;  
         int i;  
522    
523                    /* The only required data for AFTER step is this one for the overflow
524                     * control */
525                    s->desired_length = s->length;
526    
527          if (target <= 0 || target >= pass1_length) {                  return(0);
                 printf("undersize warning\n");  
528          }          }
529    
         /* perform an initial scale pass.  
            if a frame size is scaled underneath our hardcoded minimums, then we force the  
            frame size to the minimum, and deduct the original & scaled frmae length from the  
            original and target total lengths */  
530    
531          min_size[0] = ((rc->stats[0].blks[0]*22) + 240) / 8;          /*************************************************************************/
532          min_size[1] = (rc->stats[0].blks[0] + 88) / 8;          /*************************************************************************/
533          min_size[2] = 8;          /*************************************************************************/
534    
535            /*-------------------------------------------------------------------------
536             * Frame bit allocation first part
537             *
538             * First steps apply user settings, just like it is done in the theoritical
539             * scaled_curve_apply_advanced_parameters
540             *-----------------------------------------------------------------------*/
541    
542          scaler = (double)target / (double)pass1_length;          /* Set desired to what we are wanting to obtain for this frame */
543          //printf("target=%i, tot_length=%i, scaler=%f\n", (int)target, (int)pass1_length, scaler);          dbytes = (double)s->scaled_length;
544    
545          for (i=0; i<rc->num_frames; i++) {          /* IFrame user settings*/
546                  stat_t * s = &rc->stats[i];          if (s->type == XVID_TYPE_IVOP) {
547                  int len;                  /* Keyframe boosting -- All keyframes benefit from it */
548                    dbytes += dbytes*rc->param.keyframe_boost / 100;
549    
550          if (s->zone_mode == XVID_ZONE_QUANT) {  #if 0 /* ToDo: decide how to apply kfthresholding */
551              s->scaled_length = s->length;  #endif
         }else {  
                     len = (int)((double)s->length * scaler * s->weight / rc->avg_weight);  
                     if (len < min_size[s->type]) {              /* force frame size */  
                             s->scaled_length = min_size[s->type];  
                             target -= s->scaled_length;  
                             pass1_length -= s->length;  
552                      }else{                      }else{
                             s->scaled_length = 0;  
                     }  
         }  
         }  
553    
554          if (target <= 0 || target >= pass1_length) {                  /* P/S/B frames must reserve some bits for iframe boosting */
555                  printf("undersize warning\n");                  dbytes *= rc->pb_iboost_tax_ratio;
                 return;  
         }  
556    
557          scaler = (double)target / (double)pass1_length;                  /* Apply assymetric curve compression */
558          //printf("target=%i, tot_length=%i, scaler=%f\n", (int)target, (int)tot_length, scaler);                  if (rc->param.curve_compression_high || rc->param.curve_compression_low) {
559                            double assymetric_delta;
560    
561          for (i=0; i<rc->num_frames; i++) {                          /* Compute the assymetric delta, this is computed before applying
562                  stat_t * s = &rc->stats[i];                           * the tax, as done in the pre_process function */
563                            if (dbytes > rc->avg_length[s->type-1])
564                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_high / 100.0;
565                            else
566                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_low  / 100.0;
567    
568                  if (s->scaled_length==0) {      /* ignore frame with forced frame sizes */                          /* Now we must apply the assymetric tax, else our curve compression
569                          s->scaled_length = (int)((double)s->length * scaler * s->weight / rc->avg_weight);                           * would not give a theoritical target size equal to what it is
570                  }                           * expected */
571          }                          dbytes *= rc->assymetric_tax_ratio;
572    
573                            /* Now we can add the assymetric delta */
574                            dbytes += assymetric_delta;
575                    }
576  }  }
577    
578            /* That is what we would like to have -- Don't put that chunk after
579             * overflow control, otherwise, overflow is counted twice and you obtain
580             * half sized bitrate sequences */
581            s->desired_length  = (int)dbytes;
582            rc->desired_total += dbytes;
583    
584            /*------------------------------------------------------------------------
585             * Frame bit allocation: overflow control part.
586             *
587             * Unlike the theoritical scaled_curve_apply_advanced_parameters, here
588             * it's real encoding and we need to make sure we don't go so far from
589             * what is our ideal scaled curve.
590             *-----------------------------------------------------------------------*/
591    
592            /* Compute the overflow we should compensate */
593            if (s->type != XVID_TYPE_IVOP || rc->overflow > 0) {
594                    double frametype_factor;
595                    double framesize_factor;
596    
597                    /* Take only the desired part of overflow */
598                    overflow = rc->overflow;
599    
600  void pre_process1(rc_2pass2_t * rc)                  /* Factor that will take care to decrease the overflow applied
601  {                   * according to the importance of this frame type in term of
602      int i;                   * overall size */
603      double total1, total2;                  frametype_factor  = rc->count[XVID_TYPE_IVOP-1]*rc->avg_length[XVID_TYPE_IVOP-1];
604      uint64_t ivop_boost_total;                  frametype_factor += rc->count[XVID_TYPE_PVOP-1]*rc->avg_length[XVID_TYPE_PVOP-1];
605                    frametype_factor += rc->count[XVID_TYPE_BVOP-1]*rc->avg_length[XVID_TYPE_BVOP-1];
606      ivop_boost_total = 0;                  frametype_factor /= rc->count[s->type-1]*rc->avg_length[s->type-1];
607      rc->curve_comp_error = 0;                  frametype_factor  = 1/frametype_factor;
608    
609      for (i=0; i<3; i++) {                  /* Factor that will take care not to compensate too much for this frame
610          rc->tot_scaled_length[i] = 0;                   * size */
611                    framesize_factor  = dbytes;
612                    framesize_factor /= rc->avg_length[s->type-1];
613    
614                    /* Treat only the overflow part concerned by this frame type and size */
615                    overflow *= frametype_factor;
616    #if 0
617                    /* Leave this one alone, as it impacts badly on quality */
618                    overflow *= framesize_factor;
619    #endif
620    
621                    /* Apply the overflow strength imposed by the user */
622                    overflow *= (rc->param.overflow_control_strength/100.0f);
623            } else {
624                    /* no negative overflow applied in IFrames because:
625                     *  - their role is important as they're references for P/BFrames.
626                     *  - there aren't much in typical sequences, so if an IFrame overflows too
627                     *    much, this overflow may impact the next IFrame too much and generate
628                     *    a sequence of poor quality frames */
629                    overflow = 0;
630      }      }
631    
632      for (i=0; i<rc->num_frames; i++) {          /* Make sure we are not trying to compensate more overflow than we even have */
633          stat_t * s = &rc->stats[i];          if (fabs(overflow) > fabs(rc->overflow))
634                    overflow = rc->overflow;
         rc->tot_scaled_length[s->type-1] += s->scaled_length;  
635    
636          if (s->type == XVID_TYPE_IVOP) {          /* Make sure the overflow doesn't make the frame size to get out of the range
637              ivop_boost_total += s->scaled_length * rc->param.keyframe_boost / 100;           * [-max_degradation..+max_improvment] */
638          }          if (overflow > dbytes*rc->param.max_overflow_improvement / 100) {
639                    if(overflow <= dbytes)
640                            dbytes += dbytes * rc->param.max_overflow_improvement / 100;
641                    else
642                            dbytes += overflow * rc->param.max_overflow_improvement / 100;
643            } else if (overflow < - dbytes * rc->param.max_overflow_degradation / 100) {
644                    dbytes -= dbytes * rc->param.max_overflow_degradation / 100;
645            } else {
646                    dbytes += overflow;
647      }      }
648    
649      rc->movie_curve = ((double)(rc->tot_scaled_length[XVID_TYPE_PVOP-1] + rc->tot_scaled_length[XVID_TYPE_BVOP-1] + ivop_boost_total) /          /*-------------------------------------------------------------------------
650                                          (rc->tot_scaled_length[XVID_TYPE_PVOP-1] + rc->tot_scaled_length[XVID_TYPE_BVOP-1]));           * Frame bit allocation last part:
651             *
652             * Cap frame length so we don't reach neither bigger frame sizes than first
653             * pass nor smaller than the allowed minimum.
654             *-----------------------------------------------------------------------*/
655    
656      for(i=0; i<3; i++) {  #ifdef PASS_SMALLER
657          if (rc->count[i] == 0 || rc->movie_curve == 0) {          if (dbytes > s->length) {
658              rc->avg_length[i] = 1;                  dbytes = s->length;
         }else{  
             rc->avg_length[i] = rc->tot_scaled_length[i] / rc->count[i] / rc->movie_curve;  
         }  
659      }      }
660    #endif
661    
662      /* alt curve stuff here */          /* Prevent stupid desired sizes under logical values */
663            if (dbytes < rc->min_length[s->type-1]) {
664                    dbytes = rc->min_length[s->type-1];
665            }
666    
667      if (rc->param.use_alt_curve) {          /*------------------------------------------------------------------------
668          const double avg_pvop = rc->avg_length[XVID_TYPE_PVOP-1];           * Desired frame length <-> quantizer mapping
669          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];  
670    
671                  rc->alt_curve_low = avg_pvop - avg_pvop * (double)rc->param.alt_curve_low_dist / 100.0;  #ifdef BQUANT_PRESCALE
672                  rc->alt_curve_low_diff = avg_pvop - rc->alt_curve_low;          /* For bframes we prescale the quantizer to avoid too high quant scaling */
673                  rc->alt_curve_high = avg_pvop + avg_pvop * (double)rc->param.alt_curve_high_dist / 100.0;          if(s->type == XVID_TYPE_BVOP) {
                 rc->alt_curve_high_diff = rc->alt_curve_high - avg_pvop;  
674    
675          if (rc->param.alt_curve_use_auto) {                  twopass_stat_t *b_ref = s;
             if (tot_bvop + tot_pvop > tot_scaled_bvop + tot_scaled_pvop) {  
                                 rc->param.alt_curve_min_rel_qual = (int)(100.0 - (100.0 - 100.0 /  
                                         ((double)(tot_pvop + tot_bvop) / (double)(tot_scaled_pvop + tot_scaled_bvop))) * (double)rc->param.alt_curve_auto_str / 100.0);  
676    
677                                  if (rc->param.alt_curve_min_rel_qual < 20)                  /* Find the reference frame */
678                                          rc->param.alt_curve_min_rel_qual = 20;                  while(b_ref != &rc->stats[0] && b_ref->type == XVID_TYPE_BVOP)
679              }else{                          b_ref--;
680                                  rc->param.alt_curve_min_rel_qual = 100;  
681              }                  /* Compute the original quant */
682          }                  s->quant  = 2*(100*s->quant - data->bquant_offset);
683                  rc->alt_curve_mid_qual = (1.0 + (double)rc->param.alt_curve_min_rel_qual / 100.0) / 2.0;                  s->quant += data->bquant_ratio - 1; /* to avoid rounding issues */
684                  rc->alt_curve_qual_dev = 1.0 - rc->alt_curve_mid_qual;                  s->quant  = s->quant/data->bquant_ratio - b_ref->quant;
685            }
686    #endif
687    
688            /* Don't laugh at this very 'simple' quant<->size relationship, it
689             * proves to be acurate enough for our algorithm */
690            scaled_quant = (double)s->quant*(double)s->length/(double)dbytes;
691    
692    #ifdef COMPENSATE_FORMULA
693            /* We know xvidcore will apply the bframe formula again, so we compensate
694             * it right now to make sure we would not apply it twice */
695            if(s->type == XVID_TYPE_BVOP) {
696    
697          if (rc->param.alt_curve_low_dist > 100) {                  twopass_stat_t *b_ref = s;
                         switch(rc->param.alt_curve_type) {  
             case XVID_CURVE_SINE: // Sine Curve (high aggressiveness)  
                                 rc->alt_curve_qual_dev *= 2.0 / (1.0 + sin(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff)));  
                                 rc->alt_curve_mid_qual = 1.0 - rc->alt_curve_qual_dev * sin(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff));  
                                 break;  
                         case XVID_CURVE_LINEAR: // Linear (medium aggressiveness)  
                                 rc->alt_curve_qual_dev *= 2.0 / (1.0 + avg_pvop / rc->alt_curve_low_diff);  
                                 rc->alt_curve_mid_qual = 1.0 - rc->alt_curve_qual_dev * avg_pvop / rc->alt_curve_low_diff;  
                                 break;  
                         case XVID_CURVE_COSINE: // Cosine Curve (low aggressiveness)  
                                 rc->alt_curve_qual_dev *= 2.0 / (1.0 + (1.0 - cos(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff))));  
                                 rc->alt_curve_mid_qual = 1.0 - rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff)));  
                         }  
                 }  
     }  
     /* --- */  
698    
699                    /* Find the reference frame */
700                    while(b_ref != &rc->stats[0] && b_ref->type == XVID_TYPE_BVOP)
701                            b_ref--;
702    
703      total1=total2=0;                  /* Compute the quant it would be if the core did not apply the bframe
704      for (i=0; i<rc->num_frames; i++) {                   * formula */
705          stat_t * s = &rc->stats[i];                  scaled_quant  = 100*scaled_quant - data->bquant_offset;
706                    scaled_quant += data->bquant_ratio - 1; /* to avoid rouding issues */
707                    scaled_quant /= data->bquant_ratio;
708            }
709    #endif
710    
711          if (s->type != XVID_TYPE_IVOP) {          /* Quantizer has been scaled using floating point operations/results, we
712              double dbytes,dbytes2;           * must cast it to integer */
713            data->quant = (int)scaled_quant;
714    
715              dbytes = s->scaled_length / rc->movie_curve;          /* Let's clip the computed quantizer, if needed */
716              dbytes2 = 0; /* XXX: warning */          if (data->quant < 1) {
717              total1 += dbytes;                  data->quant = 1;
718              if (s->type == XVID_TYPE_BVOP)          } else if (data->quant > 31) {
719                  dbytes *= rc->avg_length[XVID_TYPE_PVOP-1] / rc->avg_length[XVID_TYPE_BVOP-1];                  data->quant = 31;
720            } else {
721    
722              if (rc->param.use_alt_curve) {                  /* The frame quantizer has not been clipped, this appears to be a good
723                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                   * computed quantizer, do not loose quantizer decimal part that we
724                     * accumulate for later reuse when its sum represents a complete
725                     * unit. */
726                    rc->quant_error[s->type-1][data->quant] += scaled_quant - (double)data->quant;
727    
728                      if (dbytes >= rc->alt_curve_high) {                  if (rc->quant_error[s->type-1][data->quant] >= 1.0) {
729                                                  dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev);                          rc->quant_error[s->type-1][data->quant] -= 1.0;
730                      }else{                          data->quant++;
731                                                  switch(rc->param.alt_curve_type) {                  } else if (rc->quant_error[s->type-1][data->quant] <= -1.0) {
732                          case XVID_CURVE_SINE :                          rc->quant_error[s->type-1][data->quant] += 1.0;
733                                                      dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * sin(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_high_diff)));                          data->quant--;
                                                         break;  
                         case XVID_CURVE_LINEAR :  
                                                     dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) / rc->alt_curve_high_diff);  
                                                         break;  
                                                 case XVID_CURVE_COSINE :  
                                                     dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_high_diff))));  
                                                 }  
                                         }  
                 }else{  
                     if (dbytes <= rc->alt_curve_low) {  
                                                 dbytes2 = dbytes;  
                     }else{  
                                                 switch(rc->param.alt_curve_type) {  
                                                 case XVID_CURVE_SINE :  
                                                     dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * sin(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_low_diff)));  
                                                         break;  
                                                 case XVID_CURVE_LINEAR :  
                                                     dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) / rc->alt_curve_low_diff);  
                                                         break;  
                                                 case XVID_CURVE_COSINE :  
                                                     dbytes2 = dbytes * (rc->alt_curve_mid_qual + rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_low_diff))));  
734                                                  }                                                  }
735                                          }                                          }
736    
737            /* Now we have a computed quant that is in the right quante range, with a
738             * possible +1 correction due to cumulated error. We can now safely clip
739             * the quantizer again with user's quant ranges. "Safely" means the Rate
740             * Control could learn more about this quantizer, this knowledge is useful
741             * for future frames even if it this quantizer won't be really used atm,
742             * that's why we don't perform this clipping earlier. */
743            if (data->quant < data->min_quant[s->type-1]) {
744                    data->quant = data->min_quant[s->type-1];
745            } else if (data->quant > data->max_quant[s->type-1]) {
746                    data->quant = data->max_quant[s->type-1];
747                  }                  }
748    
749            if (data->quant < rc->min_quant) data->quant = rc->min_quant;
750    
751              }else{          /* To avoid big quality jumps from frame to frame, we apply a "security"
752                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {           * rule that makes |last_quant - new_quant| <= 2. This rule only applies
753                      dbytes2=((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_high / 100.0);           * to predicted frames (P and B) */
754                  }else{          if (s->type != XVID_TYPE_IVOP && rc->last_quant[s->type-1] && capped_to_max_framesize == 0) {
                                 dbytes2 = ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_low / 100.0);  
                 }  
             }  
755    
756              if (s->type == XVID_TYPE_BVOP) {                  if (data->quant > rc->last_quant[s->type-1] + 2) {
757                              dbytes2 *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];                          data->quant = rc->last_quant[s->type-1] + 2;
758                              if (dbytes2 < rc->min_length[XVID_TYPE_BVOP-1])                          DPRINTF(XVID_DEBUG_RC,
759                                      dbytes2 = rc->min_length[XVID_TYPE_BVOP-1];                                          "[xvid rc] -- frame %d p/b-frame quantizer prevented from rising too steeply\n",
760              }else{                                          data->frame_num);
                             if (dbytes2 < rc->min_length[XVID_TYPE_PVOP-1])  
                                     dbytes2 = rc->min_length[XVID_TYPE_PVOP-1];  
761              }              }
762              total2 += dbytes2;                  if (data->quant < rc->last_quant[s->type-1] - 2) {
763                            data->quant = rc->last_quant[s->type-1] - 2;
764                            DPRINTF(XVID_DEBUG_RC,
765                                            "[xvid rc] -- frame:%d p/b-frame quantizer prevented from falling too steeply\n",
766                                            data->frame_num);
767          }          }
768      }      }
769    
770      rc->curve_comp_scale = total1 / total2;          /* We don't want to pollute the RC histerisis when our computed quant has
771             * been computed from a capped frame size */
772            if (capped_to_max_framesize == 0)
773                    rc->last_quant[s->type-1] = data->quant;
774    
775            /* Don't forget to force 1st pass frame type ;-) */
776            data->type = s->type;
777    
778      if (!rc->param.use_alt_curve) {          return 0;
         printf("middle frame size for asymmetric curve compression: %i\n",  
             (int)(rc->avg_length[XVID_TYPE_PVOP-1] * rc->curve_comp_scale));  
779      }      }
780    
781      if (rc->param.use_alt_curve) {  /*----------------------------------------------------------------------------
782          int bonus_bias = rc->param.alt_curve_bonus_bias;   *--------------------------------------------------------------------------*/
         int oldquant = 1;  
783    
784              if (rc->param.alt_curve_use_auto_bonus_bias)  static int
785                      bonus_bias = rc->param.alt_curve_min_rel_qual;  rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)
786    {
787            const char frame_type[4] = { 'i', 'p', 'b', 's'};
788            twopass_stat_t * s = &rc->stats[data->frame_num];
789    
790              rc->alt_curve_curve_bias_bonus = (total1 - total2) * (double)bonus_bias / 100.0 / (double)(rc->num_frames /* - credits_frames */ - rc->num_keyframes);          /* Insufficent stats data */
791              rc->curve_comp_scale = ((total1 - total2) * (1.0 - (double)bonus_bias / 100.0) + total2) / total2;          if (data->frame_num >= rc->num_frames)
792                    return 0;
793    
794            /* Update the quantizer counter */
795            rc->quant_count[s->type-1][data->quant]++;
796    
797          /* special info for alt curve:  bias bonus and quantizer thresholds */          /* Update the frame type overflow */
798            if (data->type == XVID_TYPE_IVOP) {
799                    int kfdiff = 0;
800    
801                  printf("avg scaled framesize:%i", (int)rc->avg_length[XVID_TYPE_PVOP-1]);                  if(rc->KF_idx != rc->num_frames -1) {
802                  printf("bias bonus:%i bytes", (int)rc->alt_curve_curve_bias_bonus);                          kfdiff  = rc->keyframe_locations[rc->KF_idx+1];
803                            kfdiff -= rc->keyframe_locations[rc->KF_idx];
804                    }
805    
806                  for (i=1; i <= (int)(rc->alt_curve_high*2)+1; i++) {                  /* Flush Keyframe overflow accumulator */
807              double curve_temp, dbytes;                  rc->overflow += rc->KFoverflow;
             int newquant;  
808    
809              dbytes = i;                  /* Store the frame overflow to the keyframe accumulator */
810                          if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                  rc->KFoverflow = s->desired_length - data->length;
811                  if (dbytes >= rc->alt_curve_high) {  
812                                          curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev);                  if (kfdiff > 1) {
813                  }else{                          /* Non-consecutive keyframes case:
814                                          switch(rc->param.alt_curve_type)                           * We can then divide this total keyframe overflow into equal parts
815                                          {                           * that we will distribute into regular overflow at each frame
816                                          case XVID_CURVE_SINE :                           * between the sequence bounded by two IFrames */
817                                                  curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * sin(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_high_diff)));                          rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);
                                                 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;  
818                  }else{                  }else{
819                                          switch(rc->param.alt_curve_type)                          /* Consecutive keyframes case:
820                                          {                           * Flush immediatly the keyframe overflow and reset keyframe
821                                          case XVID_CURVE_SINE :                           * overflow */
822                                                  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)));                          rc->overflow += rc->KFoverflow;
823                                                  break;                          rc->KFoverflow = 0;
824                                          case XVID_CURVE_LINEAR :                          rc->KFoverflow_partial = 0;
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) / rc->alt_curve_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))));  
825                                          }                                          }
826                    rc->KF_idx++;
827            } else {
828                    /* Accumulate the frame overflow */
829                    rc->overflow += s->desired_length - data->length;
830    
831                    /* Distribute part of the keyframe overflow */
832                    rc->overflow += rc->KFoverflow_partial;
833    
834                    /* Don't forget to substract that same amount from the total keyframe
835                     * overflow */
836                    rc->KFoverflow -= rc->KFoverflow_partial;
837                                  }                                  }
838    
839            rc->overflow += (s->error = s->desired_length - data->length);
840            rc->real_total += data->length;
841    
842            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",
843                            data->frame_num,
844                            frame_type[data->type-1],
845                            data->quant,
846                            s->length,
847                            s->scaled_length,
848                            s->desired_length,
849                            s->desired_length - s->error,
850                            -s->error,
851                            rc->overflow);
852    
853            return(0);
854                          }                          }
855    
856                          if (rc->movie_curve > 1.0)  /*****************************************************************************
857                                  dbytes *= rc->movie_curve;   * Helper functions definition
858     ****************************************************************************/
859    
860    /* Default buffer size for reading lines */
861    #define BUF_SZ   1024
862    
863    /* Helper functions for reading/parsing the stats file */
864    static char *skipspaces(char *string);
865    static int iscomment(char *string);
866    static char *readline(FILE *f);
867    
868    /* This function counts the number of frame entries in the stats file
869     * It also counts the number of I Frames */
870    static int
871    statsfile_count_frames(rc_2pass2_t * rc, char * filename)
872    {
873            FILE * f;
874            char *line;
875            int lines;
876    
877            rc->num_frames = 0;
878            rc->num_keyframes = 0;
879    
880            if ((f = fopen(filename, "rb")) == NULL)
881                    return(-1);
882    
883            lines = 0;
884            while ((line = readline(f)) != NULL) {
885    
886                    char *ptr;
887                    char type;
888                    int fields;
889    
890                    lines++;
891    
892                    /* We skip spaces */
893                    ptr = skipspaces(line);
894    
895                          newquant = (int)(dbytes * 2.0 / (curve_temp * rc->curve_comp_scale + rc->alt_curve_curve_bias_bonus));                  /* Skip coment lines or empty lines */
896                          if (newquant > 1) {                  if(iscomment(ptr) || *ptr == '\0') {
897                                  if (newquant != oldquant) {                          free(line);
898                      int percent = (int)((i - rc->avg_length[XVID_TYPE_PVOP-1]) * 100.0 / rc->avg_length[XVID_TYPE_PVOP-1]);                          continue;
                                         oldquant = newquant;  
                                         printf("quant:%i threshold at %i : %i percent", newquant, i, percent);  
899                                  }                                  }
900    
901                    /* Read the stat line from buffer */
902                    fields = sscanf(ptr, "%c", &type);
903    
904                    /* Valid stats files have at least 7 fields */
905                    if (fields == 1) {
906                            switch(type) {
907                            case 'i':
908                            case 'I':
909                                    rc->num_keyframes++;
910                            case 'p':
911                            case 'P':
912                            case 'b':
913                            case 'B':
914                            case 's':
915                            case 'S':
916                                    rc->num_frames++;
917                                    break;
918                            default:
919                                    DPRINTF(XVID_DEBUG_RC,
920                                                    "[xvid rc] -- WARNING: L%d unknown frame type used (%c).\n",
921                                                    lines, type);
922                          }                          }
923                    } else {
924                                    DPRINTF(XVID_DEBUG_RC,
925                                                    "[xvid rc] -- WARNING: L%d misses some stat fields (%d).\n",
926                                                    lines, 7-fields);
927                  }                  }
928    
929                    /* Free the line buffer */
930                    free(line);
931      }      }
932    
933      rc->overflow = 0;          /* We are done with the file */
934      rc->KFoverflow = 0;          fclose(f);
935      rc->KFoverflow_partial = 0;  
936      rc->KF_idx = 1;          return(0);
937  }  }
938    
939    /* open stats file(s) and read into rc->stats array */
940    static int
941    statsfile_load(rc_2pass2_t *rc, char * filename)
942    {
943            FILE * f;
944            int processed_entries;
945    
946            /* Opens the file */
947            if ((f = fopen(filename, "rb"))==NULL)
948                    return(-1);
949    
950            processed_entries = 0;
951            while(processed_entries < rc->num_frames) {
952                    char type;
953                    int fields;
954                    twopass_stat_t * s = &rc->stats[processed_entries];
955                    char *line, *ptr;
956    
957  static int rc_2pass2_create(xvid_plg_create_t * create, rc_2pass2_t ** handle)                  /* Read the line from the file */
958  {                  if((line = readline(f)) == NULL)
959      xvid_plugin_2pass2_t * param = (xvid_plugin_2pass2_t *)create->param;                          break;
     rc_2pass2_t * rc;  
     int i;  
960    
961      rc = malloc(sizeof(rc_2pass2_t));                  /* We skip spaces */
962      if (rc == NULL)                  ptr = skipspaces(line);
         return XVID_ERR_MEMORY;  
963    
964      rc->param = *param;                  /* Skip comment lines or empty lines */
965                    if(iscomment(ptr) || *ptr == '\0') {
966                            free(line);
967                            continue;
968                    }
969    
970      if (rc->param.keyframe_boost <= 0) rc->param.keyframe_boost = 0;                  /* Reset this field that is optional */
971      if (rc->param.payback_method <= 0) rc->param.payback_method = XVID_PAYBACK_PROP;                  s->scaled_length = 0;
     if (rc->param.bitrate_payback_delay <= 0) rc->param.bitrate_payback_delay = 250;  
     if (rc->param.curve_compression_high <= 0) rc->param.curve_compression_high = 0;  
     if (rc->param.curve_compression_low <= 0) rc->param.curve_compression_low = 0;  
     if (rc->param.max_overflow_improvement <= 0) rc->param.max_overflow_improvement = 60;  
     if (rc->param.max_overflow_degradation <= 0) rc->param.max_overflow_degradation = 60;  
   
     if (rc->param.use_alt_curve <= 0) rc->param.use_alt_curve = 0;  
     if (rc->param.alt_curve_high_dist <= 0) rc->param.alt_curve_high_dist = 500;  
     if (rc->param.alt_curve_low_dist <= 0) rc->param.alt_curve_low_dist = 90;  
     if (rc->param.alt_curve_use_auto <= 0) rc->param.alt_curve_use_auto = 1;  
     if (rc->param.alt_curve_auto_str <= 0) rc->param.alt_curve_auto_str = 30;  
     if (rc->param.alt_curve_type <= 0) rc->param.alt_curve_type = XVID_CURVE_LINEAR;  
     if (rc->param.alt_curve_min_rel_qual <= 0) rc->param.alt_curve_min_rel_qual = 50;  
     if (rc->param.alt_curve_use_auto_bonus_bias <= 0) rc->param.alt_curve_use_auto_bonus_bias = 1;  
     if (rc->param.alt_curve_bonus_bias <= 0) rc->param.alt_curve_bonus_bias = 50;  
   
     if (rc->param.kftreshold <= 0) rc->param.kftreshold = 10;  
     if (rc->param.kfreduction <= 0) rc->param.kfreduction = 20;  
     if (rc->param.min_key_interval <= 0) rc->param.min_key_interval = 300;  
972    
973      if (!det_stats_length(rc, param->filename)){                  /* Convert the fields */
974          DPRINTF(DPRINTF_RC,"fopen %s failed\n", param->filename);                  fields = sscanf(ptr,
975          free(rc);                                                  "%c %d %d %d %d %d %d %d\n",
976          return XVID_ERR_FAIL;                                                  &type,
977      }                                                  &s->quant,
978                                                    &s->blks[0], &s->blks[1], &s->blks[2],
979                                                    &s->length, &s->invariant /* not really yet */,
980                                                    &s->scaled_length);
981    
982                    /* Free line buffer, we don't need it anymore */
983                    free(line);
984    
985                    /* Fail silently, this has probably been warned in
986                     * statsfile_count_frames */
987                    if(fields != 7 && fields != 8)
988                            continue;
989    
990      if ((rc->stats = malloc(rc->num_frames * sizeof(stat_t))) == NULL) {                  /* Convert frame type and compute the invariant length part */
991          free(rc);                  switch(type) {
992          return XVID_ERR_MEMORY;                  case 'i':
993                    case 'I':
994                            s->type = XVID_TYPE_IVOP;
995                            s->invariant /= INVARIANT_HEADER_PART_IVOP;
996                            break;
997                    case 'p':
998                    case 'P':
999                    case 's':
1000                    case 'S':
1001                            s->type = XVID_TYPE_PVOP;
1002                            s->invariant /= INVARIANT_HEADER_PART_PVOP;
1003                            break;
1004                    case 'b':
1005                    case 'B':
1006                            s->type = XVID_TYPE_BVOP;
1007                            s->invariant /= INVARIANT_HEADER_PART_BVOP;
1008                            break;
1009                    default:
1010                            /* Same as before, fail silently */
1011                            continue;
1012      }      }
1013    
1014      /* XXX: do we need an addition location */                  /* Ok it seems it's been processed correctly */
1015      if ((rc->keyframe_locations = malloc((rc->num_keyframes + 1) * sizeof(int))) == NULL) {                  processed_entries++;
         free(rc->stats);  
         free(rc);  
         return XVID_ERR_MEMORY;  
1016      }      }
1017    
1018      if (!load_stats(rc, param->filename)) {          /* Close the file */
1019          DPRINTF(DPRINTF_RC,"fopen %s failed\n", param->filename);          fclose(f);
1020          free(rc->keyframe_locations);  
1021          free(rc->stats);          return(0);
         free(rc);  
         return XVID_ERR_FAIL;  
1022      }      }
1023    
1024      /* pre-process our stats */  /* pre-process the statistics data
1025     * - for each type, count, tot_length, min_length, max_length
1026     * - set keyframes_locations, tot_prescaled */
1027    static void
1028    first_pass_stats_prepare_data(rc_2pass2_t * rc)
1029    {
1030            int i,j;
1031    
1032          if (rc->num_frames  < create->fbase/create->fincr) {          /* *rc fields initialization
1033                  rc->target = rc->param.bitrate / 8;     /* one second */           * NB: INT_MAX and INT_MIN are used in order to be immediately replaced
1034          }else{           *     with real values of the 1pass */
1035                  rc->target = (rc->param.bitrate * rc->num_frames * create->fincr) / (create->fbase * 8);          for (i=0; i<3; i++) {
1036                    rc->count[i]=0;
1037                    rc->tot_length[i] = 0;
1038                    rc->tot_invariant[i] = 0;
1039                    rc->min_length[i] = INT_MAX;
1040          }          }
1041    
1042          rc->target -= rc->num_frames*24;        /* avi file header */          rc->max_length = INT_MIN;
1043            rc->tot_weighted = 0;
1044    
1045            /* Loop through all frames and find/compute all the stuff this function
1046             * is supposed to do */
1047            for (i=j=0; i<rc->num_frames; i++) {
1048                    twopass_stat_t * s = &rc->stats[i];
1049    
1050          pre_process0(rc);                  rc->count[s->type-1]++;
1051          if (rc->param.bitrate) {                  rc->tot_length[s->type-1] += s->length;
1052          zone_process(rc, create);                  rc->tot_invariant[s->type-1] += s->invariant;
1053                  internal_scale(rc);                  if (s->zone_mode != XVID_ZONE_QUANT)
1054      }else{                          rc->tot_weighted += (int)(s->weight*(s->length - s->invariant));
1055          /* external scaler: ignore zone */  
1056          for (i=0;i<rc->num_frames;i++) {                  if (s->length < rc->min_length[s->type-1]) {
1057              rc->stats[i].zone_mode = XVID_ZONE_WEIGHT;                          rc->min_length[s->type-1] = s->length;
             rc->stats[i].weight = 1.0;  
1058          }          }
1059          rc->avg_weight = 1.0;  
1060          rc->tot_quant = 0;                  if (s->length > rc->max_length) {
1061                            rc->max_length = s->length;
1062      }      }
         pre_process1(rc);  
1063    
1064      for (i=0; i<32;i++) {                  if (s->type == XVID_TYPE_IVOP) {
1065          rc->pquant_error[i] = 0;                          rc->keyframe_locations[j] = i;
1066          rc->bquant_error[i] = 0;                          j++;
1067          rc->quant_count[i] = 0;                  }
1068      }      }
1069    
1070      rc->fq_error = 0;          /* NB:
1071             * The "per sequence" overflow system considers a natural sequence to be
1072             * formed by all frames between two iframes, so if we want to make sure
1073             * the system does not go nuts during last sequence, we force the last
1074             * frame to appear in the keyframe locations array. */
1075            rc->keyframe_locations[j] = i;
1076    
1077      *handle = rc;          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Min 1st pass IFrame length: %d\n", rc->min_length[0]);
1078          return(0);          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Min 1st pass PFrame length: %d\n", rc->min_length[1]);
1079            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Min 1st pass BFrame length: %d\n", rc->min_length[2]);
1080  }  }
1081    
1082    /* calculate zone weight "center" */
1083  static int rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy)  static void
1084    zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)
1085  {  {
1086      free(rc->keyframe_locations);          int i,j;
1087      free(rc->stats);          int n = 0;
1088          free(rc);  
1089          return(0);          rc->tot_quant = 0;
1090            rc->tot_quant_invariant = 0;
1091    
1092            if (create->num_zones == 0) {
1093                    for (j = 0; j < rc->num_frames; j++) {
1094                            rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1095                            rc->stats[j].weight = 1.0;
1096                    }
1097                    n += rc->num_frames;
1098  }  }
1099    
1100    
1101            for(i=0; i < create->num_zones; i++) {
1102    
1103  static int rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)                  int next = (i+1<create->num_zones) ? create->zones[i+1].frame : rc->num_frames;
 {  
     stat_t * s = &rc->stats[data->frame_num];  
     int overflow;  
     int desired;  
     double dbytes;  
     double curve_temp;  
     int capped_to_max_framesize = 0;  
1104    
1105      if (data->quant <= 0) {                  /* Zero weight make no sense */
1106                    if (create->zones[i].increment == 0) create->zones[i].increment = 1;
1107                    /* And obviously an undetermined infinite makes even less sense */
1108                    if (create->zones[i].base == 0) create->zones[i].base = 1;
1109    
1110          if (s->zone_mode == XVID_ZONE_QUANT) {                  if (i==0 && create->zones[i].frame > 0) {
1111                            for (j = 0; j < create->zones[i].frame && j < rc->num_frames; j++) {
1112                                    rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1113                                    rc->stats[j].weight = 1.0;
1114                            }
1115                            n += create->zones[i].frame;
1116                    }
1117    
1118              rc->fq_error += s->weight;                  if (create->zones[i].mode == XVID_ZONE_WEIGHT) {
1119              data->quant = (int)rc->fq_error;                          for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {
1120              rc->fq_error -= data->quant;                                  rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1121                                    rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;
1122                            }
1123                            next -= create->zones[i].frame;
1124                            n += next;
1125                    } else{  /* XVID_ZONE_QUANT */
1126                            for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {
1127                                    rc->stats[j].zone_mode = XVID_ZONE_QUANT;
1128                                    rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;
1129                                    rc->tot_quant += rc->stats[j].length;
1130                                    rc->tot_quant_invariant += rc->stats[j].invariant;
1131                            }
1132                    }
1133            }
1134    }
1135    
         }else { /* XVID_ZONE_WEIGHT */  
1136    
1137              if (data->frame_num >= rc->num_frames) {  /* scale the curve */
1138                  /* insufficent stats data */  static void
1139                  return 0;  first_pass_scale_curve_internal(rc_2pass2_t *rc)
1140    {
1141            int64_t target;
1142            int64_t total_invariant;
1143            double scaler;
1144            int i, num_MBs;
1145    
1146            /* We only scale texture data ! */
1147            total_invariant  = rc->tot_invariant[XVID_TYPE_IVOP-1];
1148            total_invariant += rc->tot_invariant[XVID_TYPE_PVOP-1];
1149            total_invariant += rc->tot_invariant[XVID_TYPE_BVOP-1];
1150            /* don't forget to substract header bytes used in quant zones, otherwise we
1151             * counting them twice */
1152            total_invariant -= rc->tot_quant_invariant;
1153    
1154            /* We remove the bytes used by the fixed quantizer zones during first pass
1155             * with the same quants, so we know very precisely how much that
1156             * represents */
1157            target  = rc->target;
1158            target -= rc->tot_quant;
1159    
1160            /* Let's compute a linear scaler in order to perform curve scaling */
1161            scaler = (double)(target - total_invariant) / (double)(rc->tot_weighted);
1162    
1163    #ifdef SMART_OVERFLOW_SETTING
1164            if (scaler > 0.9) {
1165                    rc->param.max_overflow_degradation *= 5;
1166                    rc->param.max_overflow_improvement *= 5;
1167                    rc->param.overflow_control_strength *= 3;
1168            } else if (scaler > 0.6) {
1169                    rc->param.max_overflow_degradation *= 2;
1170                    rc->param.max_overflow_improvement *= 2;
1171                    rc->param.overflow_control_strength *= 2;
1172            } else {
1173                    rc->min_quant = 2;
1174            }
1175    #endif
1176    
1177            /* Compute min frame lengths (for each frame type) according to the number
1178             * of MBs. We sum all block type counters of frame 0, this gives us the
1179             * number of MBs.
1180             *
1181             * We compare these hardcoded values with observed values in first pass
1182             * (determined in pre_process0).Then we keep the real minimum. */
1183    
1184            /* Number of MBs */
1185            num_MBs  = rc->stats[0].blks[0];
1186            num_MBs += rc->stats[0].blks[1];
1187            num_MBs += rc->stats[0].blks[2];
1188    
1189            /* Minimum for I frames */
1190            if(rc->min_length[XVID_TYPE_IVOP-1] > ((num_MBs*22) + 240) / 8)
1191                    rc->min_length[XVID_TYPE_IVOP-1] = ((num_MBs*22) + 240) / 8;
1192    
1193            /* Minimum for P/S frames */
1194            if(rc->min_length[XVID_TYPE_PVOP-1] > ((num_MBs) + 88)  / 8)
1195                    rc->min_length[XVID_TYPE_PVOP-1] = ((num_MBs) + 88)  / 8;
1196    
1197            /* Minimum for B frames */
1198            if(rc->min_length[XVID_TYPE_BVOP-1] > 8)
1199                    rc->min_length[XVID_TYPE_BVOP-1] = 8;
1200    
1201            /* Perform an initial scale pass.
1202             *
1203             * If a frame size is scaled underneath our hardcoded minimums, then we
1204             * force the frame size to the minimum, and deduct the original & scaled
1205             * frame length from the original and target total lengths */
1206            for (i=0; i<rc->num_frames; i++) {
1207                    twopass_stat_t * s = &rc->stats[i];
1208                    int len;
1209    
1210                    /* No need to scale frame length for which a specific quantizer is
1211                     * specified thanks to zones */
1212                    if (s->zone_mode == XVID_ZONE_QUANT) {
1213                            s->scaled_length = s->length;
1214                            continue;
1215              }              }
1216    
1217              overflow = rc->overflow / 8;        /* XXX: why by 8 */                  /* Compute the scaled length -- only non invariant data length is scaled */
1218                    len = s->invariant + (int)((double)(s->length-s->invariant) * scaler * s->weight);
1219    
1220              if (s->type == XVID_TYPE_IVOP) {        /* XXX: why */                  /* Compare with the computed minimum */
1221                  overflow = 0;                  if (len < rc->min_length[s->type-1]) {
1222                            /* This is a 'forced size' frame, set its frame size to the
1223                             * computed minimum */
1224                            s->scaled_length = rc->min_length[s->type-1];
1225    
1226                            /* Remove both scaled and original size from their respective
1227                             * total counters, as we prepare a second pass for 'regular'
1228                             * frames */
1229                            target -= s->scaled_length;
1230                    } else {
1231                            /* Do nothing for now, we'll scale this later */
1232                            s->scaled_length = 0;
1233                    }
1234              }              }
1235    
1236              desired = s->scaled_length;          /* The first pass on data substracted all 'forced size' frames from the
1237             * total counters. Now, it's possible to scale the 'regular' frames. */
1238    
1239              dbytes = desired;          /* Scaling factor for 'regular' frames */
1240              if (s->type == XVID_TYPE_IVOP) {          scaler = (double)(target - total_invariant) / (double)(rc->tot_weighted);
1241                  dbytes += desired * rc->param.keyframe_boost / 100;  
1242            /* Do another pass with the new scaler */
1243            for (i=0; i<rc->num_frames; i++) {
1244                    twopass_stat_t * s = &rc->stats[i];
1245    
1246                    /* Ignore frame with forced frame sizes */
1247                    if (s->scaled_length == 0)
1248                            s->scaled_length = s->invariant + (int)((double)(s->length-s->invariant) * scaler * s->weight);
1249              }              }
             dbytes /= rc->movie_curve;  
1250    
1251              if (s->type == XVID_TYPE_BVOP) {          /* Job done */
1252                  dbytes *= rc->avg_length[XVID_TYPE_PVOP-1] / rc->avg_length[XVID_TYPE_BVOP-1];          return;
1253              }              }
1254    
1255              if (rc->param.payback_method == XVID_PAYBACK_BIAS) {  /* Apply all user settings to the scaled curve
1256                  desired =(int)(rc->curve_comp_error / rc->param.bitrate_payback_delay);   * This implies:
1257              }else{   *   keyframe boosting
1258                          //printf("desired=%i, dbytes=%i\n", desired,dbytes);   *   high/low compression */
1259                          desired = (int)(rc->curve_comp_error * dbytes /  static void
1260                                  rc->avg_length[XVID_TYPE_PVOP-1] / rc->param.bitrate_payback_delay);  scaled_curve_apply_advanced_parameters(rc_2pass2_t * rc)
1261                          //printf("desired=%i\n", desired);  {
1262            int i;
1263            int64_t ivop_boost_total;
1264    
1265                          if (labs(desired) > fabs(rc->curve_comp_error)) {          /* Reset the rate controller (per frame type) total byte counters */
1266                                  desired = (int)rc->curve_comp_error;          for (i=0; i<3; i++) rc->tot_scaled_length[i] = 0;
1267                          }  
1268            /* Compute total bytes for each frame type */
1269            for (i=0; i<rc->num_frames;i++) {
1270                    twopass_stat_t *s = &rc->stats[i];
1271                    rc->tot_scaled_length[s->type-1] += s->scaled_length;
1272              }              }
1273    
1274              rc->curve_comp_error -= desired;          /* First we compute the total amount of bits needed, as being described by
1275             * the scaled distribution. During this pass over the complete stats data,
1276             * we see how much bits two user settings will get/give from/to p&b frames:
1277             *  - keyframe boosting
1278             *  - keyframe distance penalty */
1279            rc->KF_idx = 0;
1280            ivop_boost_total = 0;
1281            for (i=0; i<rc->num_frames; i++) {
1282                    twopass_stat_t * s = &rc->stats[i];
1283    
1284              /* alt curve */                  /* Some more work is needed for I frames */
1285                    if (s->type == XVID_TYPE_IVOP) {
1286                            int ivop_boost;
1287    
1288              curve_temp = 0; /* XXX: warning */                          /* Accumulate bytes needed for keyframe boosting */
1289                            ivop_boost = s->scaled_length*rc->param.keyframe_boost/100;
1290    
1291              if (rc->param.use_alt_curve) {  #if 0 /* ToDo: decide how to apply kfthresholding */
1292                  if (s->type != XVID_TYPE_IVOP)  {  #endif
1293                      if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                          /* If the frame size drops under the minimum length, then cap ivop_boost */
1294                          if (dbytes >= rc->alt_curve_high) {                          if (ivop_boost + s->scaled_length < rc->min_length[XVID_TYPE_IVOP-1])
1295                                                  curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev);                                  ivop_boost = rc->min_length[XVID_TYPE_IVOP-1] - s->scaled_length;
1296                          }else{  
1297                              switch(rc->param.alt_curve_type) {                          /* Accumulate the ivop boost */
1298                                                  case XVID_CURVE_SINE :                          ivop_boost_total += ivop_boost;
1299                                                      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)));  
1300                                                          break;                          /* Don't forget to update the keyframe index */
1301                                                  case XVID_CURVE_LINEAR :                          rc->KF_idx++;
                                                     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))));  
1302                                                  }                                                  }
1303                                          }                                          }
1304    
1305            /* Initialize the IBoost tax ratio for P/S/B frames
1306             *
1307             * This ratio has to be applied to p/b/s frames in order to reserve
1308             * additional bits for keyframes (keyframe boosting) or if too much
1309             * keyframe distance is applied, bits retrieved from the keyframes.
1310             *
1311             * ie pb_length *= rc->pb_iboost_tax_ratio;
1312             *
1313             *    gives the ideal length of a p/b frame */
1314    
1315            /* Compute the total length of p/b/s frames (temporary storage into
1316             * movie_curve) */
1317            rc->pb_iboost_tax_ratio  = (double)rc->tot_scaled_length[XVID_TYPE_PVOP-1];
1318            rc->pb_iboost_tax_ratio += (double)rc->tot_scaled_length[XVID_TYPE_BVOP-1];
1319    
1320            /* Compute the ratio described above
1321             *     taxed_total = sum(0, n, tax*scaled_length)
1322             * <=> taxed_total = tax.sum(0, n, scaled_length)
1323             * <=> tax = taxed_total / original_total */
1324            rc->pb_iboost_tax_ratio =
1325                    (rc->pb_iboost_tax_ratio - ivop_boost_total) /
1326                    rc->pb_iboost_tax_ratio;
1327    
1328            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- IFrame boost tax ratio:%.2f\n",
1329                            rc->pb_iboost_tax_ratio);
1330    
1331            /* Compute the average size of frames per frame type */
1332            for(i=0; i<3; i++) {
1333                    /* Special case for missing type or weird case */
1334                    if (rc->count[i] == 0 || rc->pb_iboost_tax_ratio == 0) {
1335                            rc->avg_length[i] = 1;
1336                                  }else{                                  }else{
1337                          if (dbytes <= rc->alt_curve_low){                          rc->avg_length[i] = rc->tot_scaled_length[i];
1338                                                  curve_temp = dbytes;  
1339                            if (i == (XVID_TYPE_IVOP-1)) {
1340                                    /* I Frames total has to be added the boost total */
1341                                    rc->avg_length[i] += ivop_boost_total;
1342                          }else{                          }else{
1343                                                  switch(rc->param.alt_curve_type) {                                  /* P/B frames has to taxed */
1344                                                  case XVID_CURVE_SINE :                                  rc->avg_length[i] *= rc->pb_iboost_tax_ratio;
                                                     curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * sin(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_low_diff)));  
                                                         break;  
                                                 case XVID_CURVE_LINEAR :  
                                                     curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) / rc->alt_curve_low_diff);  
                                                         break;  
                                                 case XVID_CURVE_COSINE :  
                                                     curve_temp = dbytes * (rc->alt_curve_mid_qual + rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_low_diff))));  
1345                              }                              }
1346    
1347                            /* Finally compute the average frame size */
1348                            rc->avg_length[i] /= (double)rc->count[i];
1349                                          }                                          }
1350                                  }                                  }
                                 if (s->type == XVID_TYPE_BVOP)  
                                         curve_temp *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
1351    
1352                                  curve_temp = curve_temp * rc->curve_comp_scale + rc->alt_curve_curve_bias_bonus;          /* Assymetric curve compression */
1353            if (rc->param.curve_compression_high || rc->param.curve_compression_low) {
1354                    double symetric_total;
1355                    double assymetric_delta_total;
1356    
1357                                  desired += ((int)curve_temp);                  /* Like I frame boosting, assymetric curve compression modifies the total
1358                                  rc->curve_comp_error += curve_temp - (int)curve_temp;                   * amount of needed bits, we must compute the ratio so we can prescale
1359                          }else{                   lengths */
1360                                  if (s->type == XVID_TYPE_BVOP)                  symetric_total = 0;
1361                                          dbytes *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];                  assymetric_delta_total = 0;
1362                    for (i=0; i<rc->num_frames; i++) {
1363                            double assymetric_delta;
1364                            double dbytes;
1365                            twopass_stat_t * s = &rc->stats[i];
1366    
1367                                  desired += ((int)dbytes);                          /* I Frames are not concerned by assymetric scaling */
1368                                  rc->curve_comp_error += dbytes - (int)dbytes;                          if (s->type == XVID_TYPE_IVOP)
1369                          }                                  continue;
1370    
1371              }else if ((rc->param.curve_compression_high + rc->param.curve_compression_low) &&   s->type != XVID_TYPE_IVOP) {                          /* During the real run, we would have to apply the iboost tax */
1372                            dbytes = s->scaled_length * rc->pb_iboost_tax_ratio;
1373    
1374                  curve_temp = rc->curve_comp_scale;                          /* Update the symmetric curve compression total */
1375                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                          symetric_total += dbytes;
                     curve_temp *= ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_high / 100.0);  
                 } else {  
                     curve_temp *= ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_low / 100.0);  
                 }  
1376    
1377                  if (s->type == XVID_TYPE_BVOP){                          /* Apply assymetric curve compression */
1378                      curve_temp *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];                          if (dbytes > rc->avg_length[s->type-1])
1379                  }                                  assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * (double)rc->param.curve_compression_high / 100.0f;
1380                            else
1381                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * (double)rc->param.curve_compression_low  / 100.0f;
1382    
1383                  desired += (int)curve_temp;                          /* Cap to the minimum frame size if needed */
1384                  rc->curve_comp_error += curve_temp - (int)curve_temp;                          if (dbytes + assymetric_delta < rc->min_length[s->type-1])
1385              }else{                                  assymetric_delta = rc->min_length[s->type-1] - dbytes;
                 if (s->type == XVID_TYPE_BVOP){  
                                 dbytes *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
                 }  
1386    
1387                          desired += (int)dbytes;                          /* Accumulate after assymetric curve compression */
1388                          rc->curve_comp_error += dbytes - (int)dbytes;                          assymetric_delta_total += assymetric_delta;
1389              }              }
1390    
1391                  if (desired > s->length){                  /* Compute the tax that all p/b frames have to pay in order to respect the
1392                          rc->curve_comp_error += desired - s->length;                   * bit distribution changes that the assymetric compression curve imposes
1393                          desired = s->length;                   * We want assymetric_total = sum(0, n-1, tax.scaled_length)
1394                     *      ie assymetric_total = ratio.sum(0, n-1, scaled_length)
1395                     *         ratio = assymetric_total / symmetric_total */
1396                    rc->assymetric_tax_ratio = ((double)symetric_total - (double)assymetric_delta_total) / (double)symetric_total;
1397                  }else{                  }else{
1398                  if (desired < rc->min_length[s->type-1]) {                  rc->assymetric_tax_ratio = 1.0f;
                     if (s->type == XVID_TYPE_IVOP){  
                         rc->curve_comp_error -= rc->min_length[XVID_TYPE_IVOP-1] - desired;  
                     }  
                     desired = rc->min_length[s->type-1];  
1399                  }                  }
1400    
1401            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Assymetric tax ratio:%.2f\n", rc->assymetric_tax_ratio);
1402    
1403            /* Last bits that need to be reset */
1404            rc->overflow = 0;
1405            rc->KFoverflow = 0;
1406            rc->KFoverflow_partial = 0;
1407            rc->KF_idx = 0;
1408            rc->desired_total = 0;
1409            rc->real_total = 0;
1410    
1411            /* Job done */
1412            return;
1413                  }                  }
1414    
1415              s->desired_length = desired;  /*****************************************************************************
1416     * VBV compliancy check and scale
1417     * MPEG-4 standard specifies certain restrictions for bitrate/framesize in VBR
1418     * to enable playback on devices with limited readspeed and memory (and which
1419     * aren't...)
1420     *
1421     * DivX profiles have 2 criteria: VBV as in MPEG standard
1422     *                                a limit on peak bitrate for any 3 seconds
1423     *
1424     * But if VBV is fulfilled, peakrate is automatically fulfilled in any profile
1425     * define so far, so we check for it (for completeness) but correct only VBV
1426     *
1427     *****************************************************************************/
1428    
1429    #define VBV_COMPLIANT 0
1430    #define VBV_UNDERFLOW 1 /* video buffer runs empty */
1431    #define VBV_OVERFLOW 2  /* doesn't exist for VBR encoding */
1432    #define VBV_PEAKRATE 4  /* peak bitrate (within 3s) violated */
1433    
1434              /* if this keyframe is too close to the next, reduce it's byte allotment  static int check_curve_for_vbv_compliancy(rc_2pass2_t * rc, const float fps)
1435              XXX: why do we do this after setting the desired length  */  {
1436    /* We do all calculations in float, for higher accuracy,
1437       and in bytes for convenience
1438    
1439                  if (s->type == XVID_TYPE_IVOP) {     typical values from DivX Home Theater profile:
1440                          int KFdistance = rc->keyframe_locations[rc->KF_idx] - rc->keyframe_locations[rc->KF_idx - 1];     vbv_size= 384*1024 (384kB), vbv_initial= 288*1024 (75% fill)
1441       maxrate= 4000000 (4MBps), peakrate= 10000000 (10MBps)
1442    
1443                  if (KFdistance < rc->param.kftreshold) {     PAL: offset3s = 75 (3 seconds of 25fps)
1444       NTSC: offset3s = 90 (3 seconds of 29.97fps) or 72 (3 seconds of 23.976fps)
1445    */
1446    
1447      const float vbv_size = (float)rc->param.vbv_size/8.f;
1448      float vbvfill = (float)rc->param.vbv_initial/8.f;
1449    
1450      const float maxrate = (float)rc->param.vbv_maxrate;
1451      const float peakrate = (float)rc->param.vbv_peakrate;
1452      const float r0 = (int)(maxrate/fps+0.5)/8.f;
1453    
1454                      KFdistance = KFdistance - rc->param.min_key_interval;    int bytes3s = 0;
1455      int offset3s = (int)(3.f*fps+0.5);
1456    
1457                                  if (KFdistance >= 0) {    int i;
1458                          int KF_min_size;    for (i=0; i<rc->num_frames; i++) {
1459    /* DivX 3s peak bitrate check  */
1460    
1461                                          KF_min_size = desired * (100 - rc->param.kfreduction) / 100;      bytes3s += rc->stats[i].scaled_length;
1462                                          if (KF_min_size < 1)      if (i>=offset3s)
1463                                                  KF_min_size = 1;        bytes3s -= rc->stats[i-offset3s].scaled_length;
1464    
1465                                          desired = KF_min_size + (desired - KF_min_size) * KFdistance /      if (8.f*bytes3s > 3*peakrate)
1466                                                  (rc->param.kftreshold - rc->param.min_key_interval);        return VBV_PEAKRATE;
1467    
1468                                          if (desired < 1)  /* update vbv fill level */
1469                                                  desired = 1;  
1470                                  }      vbvfill += r0 - rc->stats[i].scaled_length;
1471    
1472    /* this check is _NOT_ an "overflow"! only reading from disk stops then */
1473        if (vbvfill > vbv_size)
1474          vbvfill = vbv_size;
1475    
1476    /* but THIS would be an underflow. report it! */
1477        if (vbvfill < 0)
1478          return VBV_UNDERFLOW;
1479                          }                          }
1480    
1481      return VBV_COMPLIANT;
1482                  }                  }
1483    /* TODO: store min(vbvfill) and print "minimum buffer fill" */
1484    
             overflow = (int)((double)overflow * desired / rc->avg_length[XVID_TYPE_PVOP-1]);  
1485    
1486                  // Foxer: reign in overflow with huge frames  static int scale_curve_for_vbv_compliancy(rc_2pass2_t * rc, const float fps)
1487                  if (labs(overflow) > labs(rc->overflow)) {  {
1488                          overflow = rc->overflow;  /* correct any VBV violations. Peak bitrate violations disappears
1489                  }     by this automatically
1490    
1491              // Foxer: make sure overflow doesn't run away     This implementation follows
1492    
1493                  if (overflow > desired * rc->param.max_overflow_improvement / 100) {     Westerink, Rajagopalan, Gonzales "Two-pass MPEG-2 variable-bitrate encoding"
1494                          desired += (overflow <= desired) ? desired * rc->param.max_overflow_improvement / 100 :     IBM J. RES. DEVELOP. VOL 43, No. 4, July 1999, p.471--488
1495                                  overflow * rc->param.max_overflow_improvement / 100;  
1496                  }else if (overflow < desired * rc->param.max_overflow_degradation / -100){     Thanks, guys! This paper rocks!!!
1497                          desired += desired * rc->param.max_overflow_degradation / -100;  */
1498                  }else{  
1499                          desired += overflow;  /*
1500        For each scene of len N, we have to check up to N^2 possible buffer fills.
1501        This works well with MPEG-2 where N==12 or so, but for MPEG-4 it's a
1502        little slow...
1503    
1504        TODO: Better control on VBVfill between scenes
1505    */
1506    
1507      const float vbv_size = (float)rc->param.vbv_size/8.f;
1508      const float vbv_initial = (float)rc->param.vbv_initial/8.f;
1509    
1510      const float maxrate = 0.9*rc->param.vbv_maxrate;
1511      const float vbv_low = 0.10f*vbv_size;
1512      const float r0 = (int)(maxrate/fps+0.5)/8.f;
1513    
1514      int i,k,l,n,violation = 0;
1515      float *scenefactor;
1516      int *scenestart;
1517      int *scenelength;
1518    
1519    /* first step: determine how many "scenes" there are and store their boundaries
1520       we could get all this from existing keyframe_positions, somehow, but there we
1521       don't have a min_scenelength, and it's no big deal to get it again.  */
1522    
1523      const int min_scenelength = (int)(fps+0.5);
1524      int num_scenes = 0;
1525      int last_scene = -999;
1526      for (i=0; i<rc->num_frames; i++) {
1527        if ( (rc->stats[i].type == XVID_TYPE_IVOP) && (i-last_scene>min_scenelength) )
1528        {
1529          last_scene = i;
1530          num_scenes++;
1531        }
1532                  }                  }
1533    
1534              if (desired > rc->max_length) {    scenefactor = (float*)malloc( num_scenes*sizeof(float) );
1535                          capped_to_max_framesize = 1;    scenestart = (int*)malloc( num_scenes*sizeof(int) );
1536                          desired = rc->max_length;    scenelength = (int*)malloc( num_scenes*sizeof(int) );
1537    
1538      if ((!scenefactor) || (!scenestart) || (!scenelength) )
1539      {
1540        free(scenefactor);
1541        free(scenestart);
1542        free(scenelength);
1543        /* remember: free(0) is valid and does exactly nothing. */
1544        return -1;
1545                  }                  }
1546    
1547              // make sure to not scale below the minimum framesize  /* count again and safe the length/position */
1548              if (desired < rc->min_length[s->type-1]) {  
1549                  desired = rc->min_length[s->type-1];    num_scenes = 0;
1550      last_scene = -999;
1551      for (i=0; i<rc->num_frames; i++) {
1552        if ( (rc->stats[i].type == XVID_TYPE_IVOP) && (i-last_scene>min_scenelength) )
1553        {
1554          if (num_scenes>0)
1555            scenelength[num_scenes-1]=i-last_scene;
1556          scenestart[num_scenes]=i;
1557          num_scenes++;
1558          last_scene = i;
1559        }
1560              }              }
1561      scenelength[num_scenes-1]=i-last_scene;
1562    
1563    /* second step: check for each scene, how much we can scale its frames up or down
1564       such that the VBV restriction is just fulfilled
1565    */
1566    
             // very 'simple' quant<->filesize relationship  
             data->quant= (s->quant * s->length) / desired;  
1567    
1568                  if (data->quant < 1) {  #define R(k,n) (((n)+1-(k))*r0)     /* how much enters the buffer between frame k and n */
1569                          data->quant = 1;    for (l=0; l<num_scenes;l++)
             } else if (data->quant > 31) {  
                         data->quant = 31;  
                 }  
                 else if (s->type != XVID_TYPE_IVOP)  
1570                  {                  {
1571                          // Foxer: aid desired quantizer precision by accumulating decision error      const int start = scenestart[l];
1572                          if (s->type== XVID_TYPE_BVOP) {      const int length = scenelength[l];
1573                                  rc->bquant_error[data->quant] += ((double)(s->quant * s->length) / desired) - data->quant;      twopass_stat_t * frames = &rc->stats[start];
1574    
1575                                  if (rc->bquant_error[data->quant] >= 1.0) {      float S0n,Skn;
1576                                          rc->bquant_error[data->quant] -= 1.0;      float f,minf = 99999.f;
1577                                          data->quant++;  
1578                                  }      S0n=0.;
1579                          }else{      for (n=0;n<=length-1;n++)
1580                                  rc->pquant_error[data->quant] += ((double)(s->quant * s->length) / desired) - data->quant;      {
1581          S0n += frames[n].scaled_length;
1582    
1583                      if (rc->pquant_error[data->quant] >= 1.0) {        k=0;
1584                                          rc->pquant_error[data->quant] -= 1.0;        Skn = S0n;
1585                                          ++data->quant;        f = (R(k,n-1) + (vbv_initial - vbv_low)) / Skn;
1586          if (f < minf)
1587            minf = f;
1588    
1589          for (k=1;k<=n;k++)
1590          {
1591            Skn -= frames[k].scaled_length;
1592    
1593            f = (R(k,n-1) + (vbv_size - vbv_low)) / Skn;
1594            if (f < minf)
1595              minf = f;
1596                                  }                                  }
1597                          }                          }
1598    
1599        /* special case: at the end, fill buffer up to vbv_initial again
1600           TODO: Allow other values for buffer fill between scenes
1601           e.g. if n=N is smallest f-value, then check for better value */
1602    
1603        n=length;
1604        k=0;
1605        Skn = S0n;
1606        f = R(k,n-1)/Skn;
1607        if (f < minf)
1608          minf = f;
1609    
1610        for (k=1;k<=n-1;k++)
1611        {
1612          Skn -= frames[k].scaled_length;
1613    
1614          f = (R(k,n-1) + (vbv_initial - vbv_low)) / Skn;
1615          if (f < minf)
1616            minf = f;
1617                  }                  }
1618    
1619              /* cap to min/max quant */  #ifdef VBV_DEBUG
1620        printf("Scene %d (Frames %d-%d): VBVfactor %f\n", l, start, start+length-1 , minf);
1621    #endif
1622    
1623              if (data->quant < data->min_quant[s->type-1]) {      scenefactor[l] = minf;
                 data->quant = data->min_quant[s->type-1];  
             }else if (data->quant > data->max_quant[s->type-1]) {  
                 data->quant = data->max_quant[s->type-1];  
1624              }              }
1625    #undef R
1626    
1627              /* subsequent p/b frame quants can only be +- 2 */  /* last step: now we know of any scene how much it can be scaled up or down without
1628                  if (s->type != XVID_TYPE_IVOP && rc->last_quant[s->type-1] && capped_to_max_framesize == 0) {     violating VBV. Next, distribute bits from the evil scenes to the good ones */
1629    
1630                          if (data->quant > rc->last_quant[s->type-1] + 2) {    do
1631                                  data->quant = rc->last_quant[s->type-1] + 2;    {
1632                                  DPRINTF(DPRINTF_RC, "p/b-frame quantizer prevented from rising too steeply");      float S_red = 0.f;    /* how much to redistribute */
1633        float S_elig = 0.f;   /* sum of bit for those scenes you can still swallow something*/
1634        int l;
1635    
1636        for (l=0;l<num_scenes;l++)   /* check how much is wrong */
1637        {
1638        const int start = scenestart[l];
1639        const int length = scenelength[l];
1640        twopass_stat_t * frames = &rc->stats[start];
1641    
1642          if (scenefactor[l] == 1.) /* exactly 1 means "don't touch this anymore!" */
1643            continue;
1644    
1645          if (scenefactor[l] > 1.) /* within limits */
1646          {
1647            for (n= 0; n < length; n++)
1648              S_elig += frames[n].scaled_length;
1649                          }                          }
1650                          if (data->quant < rc->last_quant[s->type-1] - 2) {        else /* underflowing segment */
1651                                  data->quant = rc->last_quant[s->type-1] - 2;        {
1652                                  DPRINTF(DPRINTF_RC, "p/b-frame quantizer prevented from falling too steeply");          for (n= 0; n < length; n++)
1653            {
1654              float newbytes = (float)frames[n].scaled_length * scenefactor[l];
1655              S_red += (float)frames[n].scaled_length - (float)newbytes;
1656              frames[n].scaled_length =(int)newbytes;
1657                          }                          }
1658            scenefactor[l] = 1.f;
1659                  }                  }
   
                 if (capped_to_max_framesize == 0) {  
                 rc->last_quant[s->type-1] = data->quant;  
1660                  }                  }
1661    
1662        if (S_red < 1.f)   /* no more underflows */
1663          break;
1664    
1665          }   /* if */      if (S_elig < 1.f)
1666        {
1667      }  #ifdef VBV_DEBUG
1668          fprintf(stderr,"Everything underflowing. \n");
1669    #endif
1670          free(scenefactor);
1671          free(scenestart);
1672          free(scenelength);
1673          return -2;
1674        }
1675    
1676        const float f_red = (1.f + S_red/S_elig);
1677    
1678    #ifdef VBV_DEBUG
1679        printf("Moving %.0f kB to avoid buffer underflow, correction factor: %.5f\n",S_red/1024.f,f_red);
1680    #endif
1681    
1682      return 0;      violation=0;
1683  }      for (l=0; l<num_scenes; l++)   /* scale remaining scenes up to meet total size */
1684        {
1685          const int start = scenestart[l];
1686          const int length = scenelength[l];
1687          twopass_stat_t * frames = &rc->stats[start];
1688    
1689          if (scenefactor[l] == 1.)
1690            continue;
1691    
1692          /* there shouldn't be any segments with factor<1 left, so all the rest is >1 */
1693    
1694  static int rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)        for (n= 0; n < length; n++)
1695  {  {
1696      stat_t * s = &rc->stats[data->frame_num];          frames[n].scaled_length = (int)(frames[n].scaled_length * f_red + 0.5);
1697          }
1698    
1699      if (data->frame_num >= rc->num_frames) {        scenefactor[l] /= f_red;
1700          /* insufficent stats data */        if (scenefactor[l] < 1.f)
1701            violation=1;
1702        }
1703    
1704      } while (violation);
1705    
1706      free(scenefactor);
1707      free(scenestart);
1708      free(scenelength);
1709          return 0;          return 0;
1710      }      }
1711    
     rc->quant_count[data->quant]++;  
1712    
1713      if (data->type == XVID_TYPE_IVOP) {  /*****************************************************************************
1714          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)
1715     ****************************************************************************/
1716    
1717    /* This function returns an allocated string containing a complete line read
1718     * from the file starting at the current position */
1719    static char *
1720    readline(FILE *f)
1721    {
1722            char *buffer = NULL;
1723            int buffer_size = 0;
1724            int pos = 0;
1725    
1726          rc->overflow += rc->KFoverflow;          do {
1727          rc->KFoverflow = s->desired_length - data->length;                  int c;
1728    
1729          if (kfdiff > 1) {  // non-consecutive keyframes                  /* Read a character from the stream */
1730              rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);                  c = fgetc(f);
1731          }else{ // consecutive keyframes  
1732                          rc->overflow += rc->KFoverflow;                  /* Is that EOF or new line ? */
1733                          rc->KFoverflow = 0;                  if(c == EOF || c == '\n')
1734                          rc->KFoverflow_partial = 0;                          break;
1735          }  
1736          rc->KF_idx++;                  /* Do we have to update buffer ? */
1737      }else{                  if(pos >= buffer_size - 1) {
1738          // distribute part of the keyframe overflow                          buffer_size += BUF_SZ;
1739          rc->overflow += s->desired_length - data->length + rc->KFoverflow_partial;                          buffer = (char*)realloc(buffer, buffer_size);
1740          rc->KFoverflow -= rc->KFoverflow_partial;                          if (buffer == NULL)
1741                                    return(NULL);
1742      }      }
1743    
1744      printf("[%i] quant:%i stats1:%i scaled:%i actual:%i overflow:%i\n",                  buffer[pos] = c;
1745          data->frame_num,                  pos++;
1746          data->quant,          } while(1);
         s->length,  
         s->scaled_length,  
         data->length,  
         rc->overflow);  
1747    
1748      return(0);          /* Read \n or EOF */
1749            if (buffer == NULL) {
1750                    /* EOF, so we reached the end of the file, return NULL */
1751                    if(feof(f))
1752                            return(NULL);
1753    
1754                    /* Just an empty line with just a newline, allocate a 1 byte buffer to
1755                     * store a zero length string */
1756                    buffer = (char*)malloc(1);
1757                    if(buffer == NULL)
1758                            return(NULL);
1759  }  }
1760    
1761            /* Zero terminated string */
1762            buffer[pos] = '\0';
1763    
1764            return(buffer);
1765    }
1766    
1767  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
1768     * string */
1769    static char *
1770    skipspaces(char *string)
1771  {  {
1772      switch(opt)          const char spaces[] =
1773      {      {
1774      case XVID_PLG_INFO :                          ' ','\t','\0'
1775          return 0;                  };
1776            const char *spacechar = spaces;
1777    
1778            if (string == NULL) return(NULL);
1779    
1780            while (*string != '\0') {
1781                    /* Test against space chars */
1782                    while (*spacechar != '\0') {
1783                            if (*string == *spacechar) {
1784                                    string++;
1785                                    spacechar = spaces;
1786                                    break;
1787                            }
1788                            spacechar++;
1789                    }
1790    
1791      case XVID_PLG_CREATE :                  /* No space char */
1792          return rc_2pass2_create((xvid_plg_create_t*)param1, param2);                  if (*spacechar == '\0') return(string);
1793            }
1794    
1795      case XVID_PLG_DESTROY :          return(string);
1796          return rc_2pass2_destroy((rc_2pass2_t*)handle, (xvid_plg_destroy_t*)param1);  }
1797    
1798      case XVID_PLG_BEFORE :  /* This function returns a boolean that tells if the string is only a
1799          return rc_2pass2_before((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);   * comment */
1800    static int
1801    iscomment(char *string)
1802    {
1803            const char comments[] =
1804                    {
1805                            '#',';', '%', '\0'
1806                    };
1807            const char *cmtchar = comments;
1808            int iscomment = 0;
1809    
1810            if (string == NULL) return(1);
1811    
1812            string = skipspaces(string);
1813    
1814            while(*cmtchar != '\0') {
1815                    if(*string == *cmtchar) {
1816                            iscomment = 1;
1817                            break;
1818                    }
1819                    cmtchar++;
1820            }
1821    
1822      case XVID_PLG_AFTER :          return(iscomment);
         return rc_2pass2_after((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);  
1823      }      }
1824    
1825      return XVID_ERR_FAIL;  #if 0
1826    static void
1827    stats_print(rc_2pass2_t * rc)
1828    {
1829            int i;
1830            const char frame_type[4] = { 'i', 'p', 'b', 's'};
1831    
1832            for (i=0; i<rc->num_frames; i++) {
1833                    twopass_stat_t *s = &rc->stats[i];
1834                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- frame:%d type:%c quant:%d stats:%d scaled:%d desired:%d actual:%d overflow(%c):%.2f\n",
1835                                    i, frame_type[s->type-1], -1, s->length, s->scaled_length,
1836                                    s->desired_length, -1, frame_type[s->type-1], -1.0f);
1837            }
1838  }  }
1839    #endif
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