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revision 1.1.2.6, Tue May 20 17:28:25 2003 UTC revision 1.1.2.38, Sun May 9 14:00:35 2004 UTC
# Line 1  Line 1 
1  /******************************************************************************  /******************************************************************************
2   *   *
3   * XviD Bit Rate Controller Library   * XviD Bit Rate Controller Library
4   * - VBR 2 pass bitrate controler implementation -   *  - VBR 2 pass bitrate controller implementation -
5   *   *
6   * Copyright (C) 2002 Edouard Gomez <ed.gomez@wanadoo.fr>   *  Copyright (C)      2002 Foxer <email?>
7     *                     2002 Dirk Knop <dknop@gwdg.de>
8     *                2002-2003 Edouard Gomez <ed.gomez@free.fr>
9     *                     2003 Pete Ross <pross@xvid.org>
10   *   *
11   * The curve treatment algorithm is the one implemented by Foxer <email?> and   *  This curve treatment algorithm is the one originally implemented by Foxer
12   * Dirk Knop <dknop@gwdg.de> for the XviD vfw dynamic library.   *  and tuned by Dirk Knop for the XviD vfw frontend.
13   *   *
14   * This program is free software; you can redistribute it and/or modify   * This program is free software; you can redistribute it and/or modify
15   * it under the terms of the GNU General Public License as published by   * it under the terms of the GNU General Public License as published by
# Line 26  Line 29 
29   *   *
30   *****************************************************************************/   *****************************************************************************/
31    
32    #define BQUANT_PRESCALE
33    #undef COMPENSATE_FORMULA
34    
35    /* forces second pass not to be bigger than first */
36    #undef PASS_SMALLER
37    
38    /* automtically alters overflow controls (strength and improvement/degradation)
39            to fight most common problems without user's knowladge */
40    #define SMART_OVERFLOW_SETTING
41    
42  #include <stdio.h>  #include <stdio.h>
43  #include <math.h>  #include <math.h>
44    #include <limits.h>
 #define RAD2DEG 57.295779513082320876798154814105  
 #define DEG2RAD 0.017453292519943295769236907684886  
45    
46  #include "../xvid.h"  #include "../xvid.h"
47  #include "../image/image.h"  #include "../image/image.h"
48    
49    /*****************************************************************************
50     * Some default settings
51     ****************************************************************************/
52    
53    #define DEFAULT_KEYFRAME_BOOST 0
54    #define DEFAULT_OVERFLOW_CONTROL_STRENGTH 10
55    #define DEFAULT_CURVE_COMPRESSION_HIGH 0
56    #define DEFAULT_CURVE_COMPRESSION_LOW 0
57    #define DEFAULT_MAX_OVERFLOW_IMPROVEMENT 10
58    #define DEFAULT_MAX_OVERFLOW_DEGRADATION 10
59    
60    /* Keyframe settings */
61    #define DEFAULT_KFREDUCTION 20
62    #define DEFAULT_KFTHRESHOLD 1
63    
64    /*****************************************************************************
65     * Some default constants (can be tuned)
66     ****************************************************************************/
67    
68    /* Specify the invariant part of the headers bits (header+MV)
69     * as  hlength/cst */
70    #define INVARIANT_HEADER_PART_IVOP 1 /* factor 1.0f   */
71    #define INVARIANT_HEADER_PART_PVOP 2 /* factor 0.5f   */
72    #define INVARIANT_HEADER_PART_BVOP 8 /* factor 0.125f */
73    
74    /*****************************************************************************
75     * Structures
76     ****************************************************************************/
77    
78    /* Statistics */
79  typedef struct {  typedef struct {
80      int type;               /* first pass type */      int type;               /* first pass type */
81      int quant;              /* first pass quant */      int quant;              /* first pass quant */
82          int blks[3];                    /* k,m,y blks */          int blks[3];                    /* k,m,y blks */
83      int length;             /* first pass length */      int length;             /* first pass length */
84            int invariant;          /* what we assume as being invariant between the two passes, it's a sub part of header + MV bits */
85      int scaled_length;      /* scaled length */      int scaled_length;      /* scaled length */
86      int desired_length;     /* desired length; calcuated during encoding */          int desired_length;     /* desired length; calculated during encoding */
87            int error;
88    
89      int zone_mode;   /* XVID_ZONE_xxx */      int zone_mode;   /* XVID_ZONE_xxx */
90      double weight;      double weight;
91  } stat_t;  } twopass_stat_t;
   
   
92    
93    /* Context struct */
 /* context struct */  
94  typedef struct  typedef struct
95  {  {
96      xvid_plugin_2pass2_t param;      xvid_plugin_2pass2_t param;
97    
98      /* constant statistical data */          /*----------------------------------
99             * constant statistical data
100             *--------------------------------*/
101    
102            /* Number of frames of the sequence */
103          int num_frames;          int num_frames;
104    
105            /* Number of Intra frames of the sequence */
106      int num_keyframes;      int num_keyframes;
     uint64_t target;    /* target filesize */  
107    
108      int count[3];   /* count of each frame types */          /* Target filesize to reach */
109      uint64_t tot_length[3];  /* total length of each frame types */          uint64_t target;
     double avg_length[3];   /* avg */  
     int min_length[3];  /* min frame length of each frame types */  
     uint64_t tot_scaled_length[3];  /* total scaled length of each frame type */  
     int max_length;     /* max frame size */  
   
     /* zone statistical data */  
     double avg_weight;  /* average weight */  
     int64_t tot_quant;   /* total length used by XVID_ZONE_QUANT zones */  
   
   
     double curve_comp_scale;  
     double movie_curve;  
   
         double alt_curve_low;  
         double alt_curve_high;  
         double alt_curve_low_diff;  
         double alt_curve_high_diff;  
     double alt_curve_curve_bias_bonus;  
         double alt_curve_mid_qual;  
         double alt_curve_qual_dev;  
110    
111      /* dynamic */          /* Count of each frame types */
112            int count[3];
113    
114            /* Total length of each frame types (1st pass) */
115            uint64_t tot_length[3];
116            uint64_t tot_invariant[3];
117    
118            /* Average length of each frame types (used first for 1st pass data and
119             * then for scaled averages */
120            double avg_length[3];
121    
122            /* Minimum frame length allowed for each frame type */
123            int min_length[3];
124    
125            /* Total bytes per frame type once the curve has been scaled
126             * NB: advanced parameters do not change this value. This field
127             *     represents the total scaled w/o any advanced settings */
128            uint64_t tot_scaled_length[3];
129    
130            /* Maximum observed frame size observed during the first pass, the RC
131             * will try tp force all frame sizes in the second pass to be under that
132             * limit */
133            int max_length;
134    
135            /*----------------------------------
136             * Zones statistical data
137             *--------------------------------*/
138    
139            /* Total length used by XVID_ZONE_QUANT zones */
140            uint64_t tot_quant;
141            uint64_t tot_quant_invariant;
142    
143            /* Holds the total amount of frame bytes, zone weighted (only scalable
144             * part of frame bytes) */
145            uint64_t tot_weighted;
146    
147            /*----------------------------------
148             * Advanced settings helper ratios
149             *--------------------------------*/
150    
151            /* This the ratio that has to be applied to all p/b frames in order
152             * to reserve/retrieve bits for/from keyframe boosting and consecutive
153             * keyframe penalty */
154            double pb_iboost_tax_ratio;
155    
156            /* This the ratio to apply to all b/p frames in order to respect the
157             * assymetric curve compression while respecting a target filesize
158             * NB: The assymetric delta gain has to be computed before this ratio
159             *     is applied, and then the delta is added to the scaled size */
160            double assymetric_tax_ratio;
161    
162            /*----------------------------------
163             * Data from the stats file kept
164             * into RAM for easy access
165             *--------------------------------*/
166    
167            /* Array of keyframe locations
168             * eg: rc->keyframe_locations[100] returns the frame number of the 100th
169             *     keyframe */
170      int * keyframe_locations;      int * keyframe_locations;
     stat_t * stats;  
171    
172      double pquant_error[32];          /* Index of the last keyframe used in the keyframe_location */
173      double bquant_error[32];          int KF_idx;
174      int quant_count[32];  
175            /* Array of all 1st pass data file -- see the twopass_stat_t structure
176             * definition for more details */
177            twopass_stat_t * stats;
178    
179            /*----------------------------------
180             * Hysteresis helpers
181             *--------------------------------*/
182    
183            /* This field holds the int2float conversion errors of each quant per
184             * frame type, this allow the RC to keep track of rouding error and thus
185             * increase or decrease the chosen quant according to this residue */
186            double quant_error[3][32];
187    
188            /* This fields stores the count of each quant usage per frame type
189             * No real role but for debugging */
190            int quant_count[3][32];
191    
192            /* Last valid quantizer used per frame type, it allows quantizer
193             * increament/decreament limitation in order to avoid big image quality
194             * "jumps" */
195      int last_quant[3];      int last_quant[3];
196    
197      double curve_comp_error;          /*----------------------------------
198      int overflow;           * Overflow control
199      int KFoverflow;           *--------------------------------*/
200      int KFoverflow_partial;  
201      int KF_idx;          /* Current overflow that has to be distributed to p/b frames */
202            double overflow;
203    
204            /* Total overflow for keyframes -- not distributed directly */
205            double KFoverflow;
206    
207            /* Amount of keyframe overflow to introduce to the global p/b frame
208             * overflow counter at each encoded frame */
209            double KFoverflow_partial;
210    
211            /* Unknown ???
212             * ToDo: description */
213      double fq_error;      double fq_error;
 } rc_2pass2_t;  
   
214    
215            int min_quant; /* internal minimal quant, prevents wrong quants from being used */
216    
217  #define BUF_SZ 1024          /*----------------------------------
218  #define MAX_COLS    5           * Debug
219             *--------------------------------*/
220            double desired_total;
221            double real_total;
222    } rc_2pass2_t;
223    
224    
225  /* open stats file, and count num frames */  /*****************************************************************************
226     * Sub plugin functions prototypes
227     ****************************************************************************/
228    
229    static int rc_2pass2_create(xvid_plg_create_t * create, rc_2pass2_t ** handle);
230    static int rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data);
231    static int rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data);
232    static int rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy);
233    
234    /*****************************************************************************
235     * Plugin definition
236     ****************************************************************************/
237    
238  static int det_stats_length(rc_2pass2_t * rc, char * filename)  int
239    xvid_plugin_2pass2(void * handle, int opt, void * param1, void * param2)
240  {  {
241      FILE * f;          switch(opt) {
242      int n, ignore;          case XVID_PLG_INFO :
243      char type;          case XVID_PLG_FRAME :
244                    return 0;
245    
246      rc->num_frames = 0;          case XVID_PLG_CREATE :
247      rc->num_keyframes = 0;                  return rc_2pass2_create((xvid_plg_create_t*)param1, param2);
248    
249      if ((f = fopen(filename, "rt")) == NULL)          case XVID_PLG_DESTROY :
250          return 0;                  return rc_2pass2_destroy((rc_2pass2_t*)handle, (xvid_plg_destroy_t*)param1);
251    
252      while((n = fscanf(f, "%c %d %d %d %d %d %d\n",          case XVID_PLG_BEFORE :
253          &type, &ignore, &ignore, &ignore, &ignore, &ignore, &ignore)) != EOF) {                  return rc_2pass2_before((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);
         if (type == 'i') {  
             rc->num_frames++;  
             rc->num_keyframes++;  
         }else if (type == 'p' || type == 'b' || type == 's') {  
             rc->num_frames++;  
         }  
     }  
254    
255      fclose(f);          case XVID_PLG_AFTER :
256                    return rc_2pass2_after((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);
257            }
258    
259      return 1;          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    #ifdef VBV
274    static  int check_curve_for_vbv_compliancy(rc_2pass2_t * rc, const float fps);
275    static  int scale_curve_for_vbv_compliancy(rc_2pass2_t * rc, const float fps);
276    #endif
277    
278    #if 0
279    static void stats_print(rc_2pass2_t * rc);
280    #endif
281    
282  /* open stats file(s) and read into rc->stats array */  /*----------------------------------------------------------------------------
283     *--------------------------------------------------------------------------*/
284    
285  static int load_stats(rc_2pass2_t *rc, char * filename)  static int
286    rc_2pass2_create(xvid_plg_create_t * create, rc_2pass2_t **handle)
287  {  {
288      FILE * f;          xvid_plugin_2pass2_t * param = (xvid_plugin_2pass2_t *)create->param;
289      int i, not_scaled;          rc_2pass2_t * rc;
290            int i;
291    
292            rc = malloc(sizeof(rc_2pass2_t));
293            if (rc == NULL)
294                    return XVID_ERR_MEMORY;
295    
296      if ((f = fopen(filename, "rt"))==NULL)          rc->param = *param;
         return 0;  
297    
298      i = 0;          /* Initialize all defaults */
299          not_scaled = 0;  #define _INIT(a, b) if((a) <= 0) (a) = (b)
300      while(i < rc->num_frames) {          /* Let's set our defaults if needed */
301          stat_t * s = &rc->stats[i];          _INIT(rc->param.keyframe_boost, DEFAULT_KEYFRAME_BOOST);
302          int n;          _INIT(rc->param.overflow_control_strength, DEFAULT_OVERFLOW_CONTROL_STRENGTH);
303          char type;          _INIT(rc->param.curve_compression_high, DEFAULT_CURVE_COMPRESSION_HIGH);
304            _INIT(rc->param.curve_compression_low, DEFAULT_CURVE_COMPRESSION_LOW);
305            _INIT(rc->param.max_overflow_improvement, DEFAULT_MAX_OVERFLOW_IMPROVEMENT);
306            _INIT(rc->param.max_overflow_degradation,  DEFAULT_MAX_OVERFLOW_DEGRADATION);
307    
308            /* Keyframe settings */
309            _INIT(rc->param.kfreduction, DEFAULT_KFREDUCTION);
310            _INIT(rc->param.kfthreshold, DEFAULT_KFTHRESHOLD);
311    #undef _INIT
312    
313                  s->scaled_length = 0;          /* Initialize some stuff to zero */
314          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++) {
315          if (n == EOF) break;                  int j;
316                  if (n < 7) {                  for (j=0; j<32; j++) {
317                          not_scaled = 1;                          rc->quant_error[i][j] = 0;
318                            rc->quant_count[i][j] = 0;
319                  }                  }
   
         if (type == 'i') {  
             s->type = XVID_TYPE_IVOP;  
         }else if (type == 'p' || type == 's') {  
             s->type = XVID_TYPE_PVOP;  
         }else if (type == 'b') {  
             s->type = XVID_TYPE_BVOP;  
         }else{  /* unknown type */  
             DPRINTF(XVID_DEBUG_RC, "unknown stats frame type; assuming pvop");  
             s->type = XVID_TYPE_PVOP;  
320          }          }
321    
322          i++;          for (i=0; i<3; i++) rc->last_quant[i] = 0;
323    
324            rc->fq_error = 0;
325            rc->min_quant = 1;
326    
327            /* Count frames (and intra frames) in the stats file, store the result into
328             * the rc structure */
329            if (statsfile_count_frames(rc, param->filename) == -1) {
330                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- ERROR: fopen %s failed\n", param->filename);
331                    free(rc);
332                    return(XVID_ERR_FAIL);
333      }      }
     rc->num_frames = i;  
334    
335      fclose(f);          /* Allocate the stats' memory */
336            if ((rc->stats = malloc(rc->num_frames * sizeof(twopass_stat_t))) == NULL) {
337                    free(rc);
338                    return(XVID_ERR_MEMORY);
339            }
340    
341      return 1;          /* Allocate keyframes location's memory
342             * PS: see comment in pre_process0 for the +1 location requirement */
343            rc->keyframe_locations = malloc((rc->num_keyframes + 1) * sizeof(int));
344            if (rc->keyframe_locations == NULL) {
345                    free(rc->stats);
346                    free(rc);
347                    return(XVID_ERR_MEMORY);
348  }  }
349    
350            /* Load the first pass stats */
351            if (statsfile_load(rc, param->filename) == -1) {
352                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- ERROR: fopen %s failed\n", param->filename);
353                    free(rc->keyframe_locations);
354                    free(rc->stats);
355                    free(rc);
356                    return XVID_ERR_FAIL;
357            }
358    
359            /* Compute the target filesize */
360            if (rc->param.bitrate<0) {
361                    /* if negative, bitrate equals the target (in kbytes) */
362                    rc->target = ((uint64_t)(-rc->param.bitrate)) * 1024;
363            } else if (rc->num_frames  < create->fbase/create->fincr) {
364                    /* Source sequence is less than 1s long, we do as if it was 1s long */
365                    rc->target = rc->param.bitrate / 8;
366            } else {
367                    /* Target filesize = bitrate/8 * numframes / framerate */
368                    rc->target =
369                            ((uint64_t)rc->param.bitrate * (uint64_t)rc->num_frames * \
370                             (uint64_t)create->fincr) / \
371                            ((uint64_t)create->fbase * 8);
372            }
373    
374            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Frame rate: %d/%d (%ffps)\n",
375                            create->fbase, create->fincr,
376                            (double)create->fbase/(double)create->fincr);
377            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Number of frames: %d\n", rc->num_frames);
378            if(rc->param.bitrate>=0)
379                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Target bitrate: %ld\n", rc->param.bitrate);
380            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Target filesize: %lld\n", rc->target);
381    
382            /* Compensate the average frame overhead caused by the container */
383            rc->target -= rc->num_frames*rc->param.container_frame_overhead;
384            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Container Frame overhead: %d\n", rc->param.container_frame_overhead);
385            if(rc->param.container_frame_overhead)
386                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- New target filesize after container compensation: %lld\n", rc->target);
387    
388  #if 0          /* When bitrate is not given it means it has been scaled by an external
389  static void print_stats(rc_2pass2_t * rc)           * application */
390  {          if (rc->param.bitrate) {
391      int i;                  /* Apply zone settings
392                     * - set rc->tot_quant which represents the total num of bytes spent in
393                     *   fixed quant zones
394                     * - set rc->tot_weighted which represents the total amount of bytes
395                     *   spent in normal or weighted zones in first pass (normal zones can
396                     *   be considered weight=1)
397                     * - set rc->tot_quant_invariant which represents the total num of bytes
398                     *   spent in fixed quant zones for headers */
399                    zone_process(rc, create);
400            } else {
401                    /* External scaling -- zones are ignored */
402      for (i = 0; i < rc->num_frames; i++) {      for (i = 0; i < rc->num_frames; i++) {
403          stat_t * s = &rc->stats[i];                          rc->stats[i].zone_mode = XVID_ZONE_WEIGHT;
404          DPRINTF(XVID_DEBUG_RC, "%i %i %i %i\n", s->type, s->quant, s->length, s->scaled_length);                          rc->stats[i].weight = 1.0;
405      }      }
406                    rc->tot_quant = 0;
407  }  }
 #endif  
408    
409  /* pre-process the statistics data          /* Gathers some information about first pass stats:
410      - for each type, count, tot_length, min_length, max_length           *  - finds the minimum frame length for each frame type during 1st pass.
411      - set keyframes_locations           *     rc->min_size[]
412             *  - determines the maximum frame length observed (no frame type distinction).
413             *     rc->max_size
414             *  - count how many times each frame type has been used.
415             *     rc->count[]
416             *  - total bytes used per frame type
417             *     rc->tot_length[]
418             *  - total bytes considered invariant between the 2 passes
419             *  - store keyframe location
420             *     rc->keyframe_locations[]
421  */  */
422            first_pass_stats_prepare_data(rc);
423    
424  void pre_process0(rc_2pass2_t * rc)          /* If we have a user bitrate, it means it's an internal curve scaling */
425  {          if (rc->param.bitrate) {
426      int i,j;                  /* Perform internal curve scaling */
427                    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;  
428      }      }
429    
430      for (i=j=0; i<rc->num_frames; i++) {          /* Apply advanced curve options, and compute some parameters in order to
431          stat_t * s = &rc->stats[i];           * shape the curve in the BEFORE/AFTER pair of functions */
432            scaled_curve_apply_advanced_parameters(rc);
433    
         rc->count[s->type-1]++;  
         rc->tot_length[s->type-1] += s->length;  
434    
435          if (i == 0 || s->length < rc->min_length[s->type-1]) {  #ifdef VBV
436              rc->min_length[s->type-1] = s->length;  /* Check curve for VBV compliancy and rescale if necessary */
         }  
437    
         if (i == 0 || s->length > rc->max_length) {  
             rc->max_length = s->length;  
         }  
438    
439          if (s->type == XVID_TYPE_IVOP) {  #ifdef VBV_FORCE
440              rc->keyframe_locations[j] = i;    if (rc->param.vbvsize==0)
441              j++;    {
442        rc->param.vbvsize      =  3145728;
443        rc->param.vbvinitial   =  2359296;
444        rc->param.vbv_maxrate  =  4000000;
445        rc->param.vbv_peakrate = 10000000;
446          }          }
447    #endif
448    
449      if (rc->param.vbvsize>0)    /* vbvsize==0 switches VBV check off */
450      {
451        const double fps = (double)create->fbase/(double)create->fincr;
452        int status = check_curve_for_vbv_compliancy(rc, fps);
453    #ifdef VBV_DEBUG
454        if (status)
455          fprintf(stderr,"underflow detected\n Scaling Curve for compliancy... ");
456    #endif
457    
458            status = scale_curve_for_vbv_compliancy(rc, fps);
459    
460    #ifdef VBV_DEBUG
461          if (status==0)
462            fprintf(stderr,"done.\n");
463          else
464            fprintf(stderr,"impossible.\n");
465    #endif
466      }      }
467      rc->keyframe_locations[j] = i;  #endif
468    
469            *handle = rc;
470            return(0);
471  }  }
472    
473    /*----------------------------------------------------------------------------
474     *--------------------------------------------------------------------------*/
475    
476  /* calculate zone weight "center" */  static int
477    rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy)
478    {
479            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- target_total:%lld desired_total:%.2f (%.2f%%) actual_total:%.2f (%.2f%%)\n",
480                            rc->target,
481                            rc->desired_total,
482                            100*rc->desired_total/(double)rc->target,
483                            rc->real_total,
484                            100*rc->real_total/(double)rc->target);
485    
486            free(rc->keyframe_locations);
487            free(rc->stats);
488            free(rc);
489            return(0);
490    }
491    
492  static void zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)  /*----------------------------------------------------------------------------
493     *--------------------------------------------------------------------------*/
494    
495    static int
496    rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)
497  {  {
498      int i,j;          twopass_stat_t * s = &rc->stats[data->frame_num];
499      int n = 0;          double dbytes;
500            double scaled_quant;
501            double overflow;
502            int capped_to_max_framesize = 0;
503    
504      rc->avg_weight = 0.0;          /* This function is quite long but easy to understand. In order to simplify
505      rc->tot_quant = 0;           * the code path (a bit), we treat 3 cases that can return immediatly. */
506    
507            /* First case: Another plugin has already set a quantizer */
508            if (data->quant > 0)
509                    return(0);
510    
511      if (create->num_zones == 0) {          /* Second case: insufficent stats data
512          for (j = 0; j < rc->num_frames; j++) {           * We can't guess much what we should do, let core decide all alone */
513              rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;          if (data->frame_num >= rc->num_frames) {
514              rc->stats[j].weight = 1.0;                  DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- stats file too short (now processing frame %d)",
515                            data->frame_num);
516                    return(0);
517          }          }
518          rc->avg_weight += rc->num_frames * 1.0;  
519          n += rc->num_frames;          /* Third case: We are in a Quant zone
520             * Quant zones must just ensure we use the same settings as first pass
521             * So set the quantizer and the type */
522            if (s->zone_mode == XVID_ZONE_QUANT) {
523                    /* Quant stuff */
524                    rc->fq_error += s->weight;
525                    data->quant = (int)rc->fq_error;
526                    rc->fq_error -= data->quant;
527    
528                    /* The type stuff */
529                    data->type = s->type;
530    
531                    /* The only required data for AFTER step is this one for the overflow
532                     * control */
533                    s->desired_length = s->length;
534    
535                    return(0);
536      }      }
537    
538    
539      for(i=0; i < create->num_zones; i++) {          /*************************************************************************/
540            /*************************************************************************/
541            /*************************************************************************/
542    
543          int next = (i+1<create->num_zones) ? create->zones[i+1].frame : rc->num_frames;          /*-------------------------------------------------------------------------
544             * Frame bit allocation first part
545             *
546             * First steps apply user settings, just like it is done in the theoritical
547             * scaled_curve_apply_advanced_parameters
548             *-----------------------------------------------------------------------*/
549    
550          if (i==0 && create->zones[i].frame > 0) {          /* Set desired to what we are wanting to obtain for this frame */
551              for (j = 0; j < create->zones[i].frame && j < rc->num_frames; j++) {          dbytes = (double)s->scaled_length;
552                  rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;  
553                  rc->stats[j].weight = 1.0;          /* IFrame user settings*/
554            if (s->type == XVID_TYPE_IVOP) {
555                    /* Keyframe boosting -- All keyframes benefit from it */
556                    dbytes += dbytes*rc->param.keyframe_boost / 100;
557    
558    #if 0 /* ToDo: decide how to apply kfthresholding */
559    #endif
560            } else {
561    
562                    /* P/S/B frames must reserve some bits for iframe boosting */
563                    dbytes *= rc->pb_iboost_tax_ratio;
564    
565                    /* Apply assymetric curve compression */
566                    if (rc->param.curve_compression_high || rc->param.curve_compression_low) {
567                            double assymetric_delta;
568    
569                            /* Compute the assymetric delta, this is computed before applying
570                             * the tax, as done in the pre_process function */
571                            if (dbytes > rc->avg_length[s->type-1])
572                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_high / 100.0;
573                            else
574                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_low  / 100.0;
575    
576                            /* Now we must apply the assymetric tax, else our curve compression
577                             * would not give a theoritical target size equal to what it is
578                             * expected */
579                            dbytes *= rc->assymetric_tax_ratio;
580    
581                            /* Now we can add the assymetric delta */
582                            dbytes += assymetric_delta;
583              }              }
             rc->avg_weight += create->zones[i].frame * 1.0;  
             n += create->zones[i].frame;  
584          }          }
585    
586          if (create->zones[i].mode == XVID_ZONE_WEIGHT) {          /* That is what we would like to have -- Don't put that chunk after
587              for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {           * overflow control, otherwise, overflow is counted twice and you obtain
588                  rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;           * half sized bitrate sequences */
589                  rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;          s->desired_length  = (int)dbytes;
590            rc->desired_total += dbytes;
591    
592            /*------------------------------------------------------------------------
593             * Frame bit allocation: overflow control part.
594             *
595             * Unlike the theoritical scaled_curve_apply_advanced_parameters, here
596             * it's real encoding and we need to make sure we don't go so far from
597             * what is our ideal scaled curve.
598             *-----------------------------------------------------------------------*/
599    
600            /* Compute the overflow we should compensate */
601            if (s->type != XVID_TYPE_IVOP || rc->overflow > 0) {
602                    double frametype_factor;
603                    double framesize_factor;
604    
605                    /* Take only the desired part of overflow */
606                    overflow = rc->overflow;
607    
608                    /* Factor that will take care to decrease the overflow applied
609                     * according to the importance of this frame type in term of
610                     * overall size */
611                    frametype_factor  = rc->count[XVID_TYPE_IVOP-1]*rc->avg_length[XVID_TYPE_IVOP-1];
612                    frametype_factor += rc->count[XVID_TYPE_PVOP-1]*rc->avg_length[XVID_TYPE_PVOP-1];
613                    frametype_factor += rc->count[XVID_TYPE_BVOP-1]*rc->avg_length[XVID_TYPE_BVOP-1];
614                    frametype_factor /= rc->count[s->type-1]*rc->avg_length[s->type-1];
615                    frametype_factor  = 1/frametype_factor;
616    
617                    /* Factor that will take care not to compensate too much for this frame
618                     * size */
619                    framesize_factor  = dbytes;
620                    framesize_factor /= rc->avg_length[s->type-1];
621    
622                    /* Treat only the overflow part concerned by this frame type and size */
623                    overflow *= frametype_factor;
624    #if 0
625                    /* Leave this one alone, as it impacts badly on quality */
626                    overflow *= framesize_factor;
627    #endif
628    
629                    /* Apply the overflow strength imposed by the user */
630                    overflow *= (rc->param.overflow_control_strength/100.0f);
631            } else {
632                    /* no negative overflow applied in IFrames because:
633                     *  - their role is important as they're references for P/BFrames.
634                     *  - there aren't much in typical sequences, so if an IFrame overflows too
635                     *    much, this overflow may impact the next IFrame too much and generate
636                     *    a sequence of poor quality frames */
637                    overflow = 0;
638              }              }
639              next -= create->zones[i].frame;  
640              rc->avg_weight += (double)(next * create->zones[i].increment) / (double)create->zones[i].base;          /* Make sure we are not trying to compensate more overflow than we even have */
641              n += next;          if (fabs(overflow) > fabs(rc->overflow))
642          }else{  // XVID_ZONE_QUANT                  overflow = rc->overflow;
643              for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {  
644                  rc->stats[j].zone_mode = XVID_ZONE_QUANT;          /* Make sure the overflow doesn't make the frame size to get out of the range
645                  rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;           * [-max_degradation..+max_improvment] */
646                  rc->tot_quant += rc->stats[j].length;          if (overflow > dbytes*rc->param.max_overflow_improvement / 100) {
647                    if(overflow <= dbytes)
648                            dbytes += dbytes * rc->param.max_overflow_improvement / 100;
649                    else
650                            dbytes += overflow * rc->param.max_overflow_improvement / 100;
651            } else if (overflow < - dbytes * rc->param.max_overflow_degradation / 100) {
652                    dbytes -= dbytes * rc->param.max_overflow_degradation / 100;
653            } else {
654                    dbytes += overflow;
655              }              }
656    
657            /*-------------------------------------------------------------------------
658             * Frame bit allocation last part:
659             *
660             * Cap frame length so we don't reach neither bigger frame sizes than first
661             * pass nor smaller than the allowed minimum.
662             *-----------------------------------------------------------------------*/
663    
664    #ifdef PASS_SMALLER
665            if (dbytes > s->length) {
666                    dbytes = s->length;
667          }          }
668    #endif
669    
670            /* Prevent stupid desired sizes under logical values */
671            if (dbytes < rc->min_length[s->type-1]) {
672                    dbytes = rc->min_length[s->type-1];
673      }      }
     rc->avg_weight = n>0 ? rc->avg_weight/n : 1.0;  
674    
675      DPRINTF(XVID_DEBUG_RC, "center_weight: %f (for %i frames);   fixed_bytes: %i\n", rc->avg_weight, n, rc->tot_quant);          /*------------------------------------------------------------------------
676             * Desired frame length <-> quantizer mapping
677             *-----------------------------------------------------------------------*/
678    
679    #ifdef BQUANT_PRESCALE
680            /* For bframes we prescale the quantizer to avoid too high quant scaling */
681            if(s->type == XVID_TYPE_BVOP) {
682    
683                    twopass_stat_t *b_ref = s;
684    
685                    /* Find the reference frame */
686                    while(b_ref != &rc->stats[0] && b_ref->type == XVID_TYPE_BVOP)
687                            b_ref--;
688    
689                    /* Compute the original quant */
690                    s->quant  = 2*(100*s->quant - data->bquant_offset);
691                    s->quant += data->bquant_ratio - 1; /* to avoid rounding issues */
692                    s->quant  = s->quant/data->bquant_ratio - b_ref->quant;
693  }  }
694    #endif
695    
696            /* Don't laugh at this very 'simple' quant<->size relationship, it
697             * proves to be acurate enough for our algorithm */
698            scaled_quant = (double)s->quant*(double)s->length/(double)dbytes;
699    
700    #ifdef COMPENSATE_FORMULA
701            /* We know xvidcore will apply the bframe formula again, so we compensate
702             * it right now to make sure we would not apply it twice */
703            if(s->type == XVID_TYPE_BVOP) {
704    
705  /* scale the curve */                  twopass_stat_t *b_ref = s;
706    
707  static void internal_scale(rc_2pass2_t *rc)                  /* Find the reference frame */
708  {                  while(b_ref != &rc->stats[0] && b_ref->type == XVID_TYPE_BVOP)
709          int64_t target  = rc->target - rc->tot_quant;                          b_ref--;
710          int64_t pass1_length = rc->tot_length[0] + rc->tot_length[1] + rc->tot_length[2] - rc->tot_quant;  
711          int min_size[3];                  /* Compute the quant it would be if the core did not apply the bframe
712          double scaler;                   * formula */
713          int i;                  scaled_quant  = 100*scaled_quant - data->bquant_offset;
714                    scaled_quant += data->bquant_ratio - 1; /* to avoid rouding issues */
715                    scaled_quant /= data->bquant_ratio;
716            }
717    #endif
718    
719            /* Quantizer has been scaled using floating point operations/results, we
720             * must cast it to integer */
721            data->quant = (int)scaled_quant;
722    
723          /* perform an initial scale pass.          /* Let's clip the computed quantizer, if needed */
724             if a frame size is scaled underneath our hardcoded minimums, then we force the          if (data->quant < 1) {
725             frame size to the minimum, and deduct the original & scaled frmae length from the                  data->quant = 1;
726             original and target total lengths */          } else if (data->quant > 31) {
727                    data->quant = 31;
728            } else {
729    
730          min_size[0] = ((rc->stats[0].blks[0]*22) + 240) / 8;                  /* The frame quantizer has not been clipped, this appears to be a good
731          min_size[1] = (rc->stats[0].blks[0] + 88) / 8;                   * computed quantizer, do not loose quantizer decimal part that we
732          min_size[2] = 8;                   * accumulate for later reuse when its sum represents a complete
733                     * unit. */
734                    rc->quant_error[s->type-1][data->quant] += scaled_quant - (double)data->quant;
735    
736          scaler = (double)target / (double)pass1_length;                  if (rc->quant_error[s->type-1][data->quant] >= 1.0) {
737                            rc->quant_error[s->type-1][data->quant] -= 1.0;
738                            data->quant++;
739                    } else if (rc->quant_error[s->type-1][data->quant] <= -1.0) {
740                            rc->quant_error[s->type-1][data->quant] += 1.0;
741                            data->quant--;
742                    }
743            }
744    
745          if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {          /* Now we have a computed quant that is in the right quante range, with a
746                  DPRINTF(XVID_DEBUG_RC, "undersize warning\n");           * possible +1 correction due to cumulated error. We can now safely clip
747          scaler = 1.0;           * the quantizer again with user's quant ranges. "Safely" means the Rate
748             * Control could learn more about this quantizer, this knowledge is useful
749             * for future frames even if it this quantizer won't be really used atm,
750             * that's why we don't perform this clipping earlier. */
751            if (data->quant < data->min_quant[s->type-1]) {
752                    data->quant = data->min_quant[s->type-1];
753            } else if (data->quant > data->max_quant[s->type-1]) {
754                    data->quant = data->max_quant[s->type-1];
755          }          }
756    
757      DPRINTF(XVID_DEBUG_RC, "target=%i, tot_length=%i, scaler=%f\n", (int)target, (int)pass1_length, scaler);          if (data->quant < rc->min_quant) data->quant = rc->min_quant;
758    
759          for (i=0; i<rc->num_frames; i++) {          /* To avoid big quality jumps from frame to frame, we apply a "security"
760                  stat_t * s = &rc->stats[i];           * rule that makes |last_quant - new_quant| <= 2. This rule only applies
761                  int len;           * to predicted frames (P and B) */
762            if (s->type != XVID_TYPE_IVOP && rc->last_quant[s->type-1] && capped_to_max_framesize == 0) {
763    
764          if (s->zone_mode == XVID_ZONE_QUANT) {                  if (data->quant > rc->last_quant[s->type-1] + 2) {
765              s->scaled_length = s->length;                          data->quant = rc->last_quant[s->type-1] + 2;
766          }else {                          DPRINTF(XVID_DEBUG_RC,
767                      len = (int)((double)s->length * scaler * s->weight / rc->avg_weight);                                          "[xvid rc] -- frame %d p/b-frame quantizer prevented from rising too steeply\n",
768                      if (len < min_size[s->type-1]) {            /* force frame size */                                          data->frame_num);
                             s->scaled_length = min_size[s->type-1];  
                             target -= s->scaled_length;  
                             pass1_length -= s->length;  
                     }else{  
                             s->scaled_length = 0;  
769                      }                      }
770                    if (data->quant < rc->last_quant[s->type-1] - 2) {
771                            data->quant = rc->last_quant[s->type-1] - 2;
772                            DPRINTF(XVID_DEBUG_RC,
773                                            "[xvid rc] -- frame:%d p/b-frame quantizer prevented from falling too steeply\n",
774                                            data->frame_num);
775          }          }
776          }          }
777    
778      scaler = (double)target / (double)pass1_length;          /* We don't want to pollute the RC histerisis when our computed quant has
779      if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {           * been computed from a capped frame size */
780                  DPRINTF(XVID_DEBUG_RC,"undersize warning\n");          if (capped_to_max_framesize == 0)
781                  scaler = 1.0;                  rc->last_quant[s->type-1] = data->quant;
782    
783            /* Don't forget to force 1st pass frame type ;-) */
784            data->type = s->type;
785    
786            return 0;
787          }          }
788    
789          DPRINTF(XVID_DEBUG_RC, "target=%i, tot_length=%i, scaler=%f\n", (int)target, (int)pass1_length, scaler);  /*----------------------------------------------------------------------------
790     *--------------------------------------------------------------------------*/
791    
792          for (i=0; i<rc->num_frames; i++) {  static int
793                  stat_t * s = &rc->stats[i];  rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)
794    {
795            const char frame_type[4] = { 'i', 'p', 'b', 's'};
796            twopass_stat_t * s = &rc->stats[data->frame_num];
797    
798                  if (s->scaled_length==0) {      /* ignore frame with forced frame sizes */          /* Insufficent stats data */
799                          s->scaled_length = (int)((double)s->length * scaler * s->weight / rc->avg_weight);          if (data->frame_num >= rc->num_frames)
800                    return 0;
801    
802            /* Update the quantizer counter */
803            rc->quant_count[s->type-1][data->quant]++;
804    
805            /* Update the frame type overflow */
806            if (data->type == XVID_TYPE_IVOP) {
807                    int kfdiff = 0;
808    
809                    if(rc->KF_idx != rc->num_frames -1) {
810                            kfdiff  = rc->keyframe_locations[rc->KF_idx+1];
811                            kfdiff -= rc->keyframe_locations[rc->KF_idx];
812                  }                  }
813    
814                    /* Flush Keyframe overflow accumulator */
815                    rc->overflow += rc->KFoverflow;
816    
817                    /* Store the frame overflow to the keyframe accumulator */
818                    rc->KFoverflow = s->desired_length - data->length;
819    
820                    if (kfdiff > 1) {
821                            /* Non-consecutive keyframes case:
822                             * We can then divide this total keyframe overflow into equal parts
823                             * that we will distribute into regular overflow at each frame
824                             * between the sequence bounded by two IFrames */
825                            rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);
826                    } else {
827                            /* Consecutive keyframes case:
828                             * Flush immediatly the keyframe overflow and reset keyframe
829                             * overflow */
830                            rc->overflow += rc->KFoverflow;
831                            rc->KFoverflow = 0;
832                            rc->KFoverflow_partial = 0;
833          }          }
834                    rc->KF_idx++;
835            } else {
836                    /* Accumulate the frame overflow */
837                    rc->overflow += s->desired_length - data->length;
838    
839                    /* Distribute part of the keyframe overflow */
840                    rc->overflow += rc->KFoverflow_partial;
841    
842                    /* Don't forget to substract that same amount from the total keyframe
843                     * overflow */
844                    rc->KFoverflow -= rc->KFoverflow_partial;
845  }  }
846    
847            rc->overflow += (s->error = s->desired_length - data->length);
848            rc->real_total += data->length;
849    
850            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",
851                            data->frame_num,
852                            frame_type[data->type-1],
853                            data->quant,
854                            s->length,
855                            s->scaled_length,
856                            s->desired_length,
857                            s->desired_length - s->error,
858                            -s->error,
859                            rc->overflow);
860    
861            return(0);
862    }
863    
864    /*****************************************************************************
865     * Helper functions definition
866     ****************************************************************************/
867    
868  void pre_process1(rc_2pass2_t * rc)  /* Default buffer size for reading lines */
869    #define BUF_SZ   1024
870    
871    /* Helper functions for reading/parsing the stats file */
872    static char *skipspaces(char *string);
873    static int iscomment(char *string);
874    static char *readline(FILE *f);
875    
876    /* This function counts the number of frame entries in the stats file
877     * It also counts the number of I Frames */
878    static int
879    statsfile_count_frames(rc_2pass2_t * rc, char * filename)
880  {  {
881      int i;          FILE * f;
882      double total1, total2;          char *line;
883      uint64_t ivop_boost_total;          int lines;
884    
885      ivop_boost_total = 0;          rc->num_frames = 0;
886      rc->curve_comp_error = 0;          rc->num_keyframes = 0;
887    
888      for (i=0; i<3; i++) {          if ((f = fopen(filename, "rb")) == NULL)
889          rc->tot_scaled_length[i] = 0;                  return(-1);
     }  
890    
891      for (i=0; i<rc->num_frames; i++) {          lines = 0;
892          stat_t * s = &rc->stats[i];          while ((line = readline(f)) != NULL) {
893    
894          rc->tot_scaled_length[s->type-1] += s->scaled_length;                  char *ptr;
895                    char type;
896                    int fields;
897    
898          if (s->type == XVID_TYPE_IVOP) {                  lines++;
899              ivop_boost_total += s->scaled_length * rc->param.keyframe_boost / 100;  
900          }                  /* We skip spaces */
901                    ptr = skipspaces(line);
902    
903                    /* Skip coment lines or empty lines */
904                    if(iscomment(ptr) || *ptr == '\0') {
905                            free(line);
906                            continue;
907      }      }
908    
909      rc->movie_curve = ((double)(rc->tot_scaled_length[XVID_TYPE_PVOP-1] + rc->tot_scaled_length[XVID_TYPE_BVOP-1] + ivop_boost_total) /                  /* Read the stat line from buffer */
910                                          (rc->tot_scaled_length[XVID_TYPE_PVOP-1] + rc->tot_scaled_length[XVID_TYPE_BVOP-1]));                  fields = sscanf(ptr, "%c", &type);
911    
912      for(i=0; i<3; i++) {                  /* Valid stats files have at least 7 fields */
913          if (rc->count[i] == 0 || rc->movie_curve == 0) {                  if (fields == 1) {
914              rc->avg_length[i] = 1;                          switch(type) {
915                            case 'i':
916                            case 'I':
917                                    rc->num_keyframes++;
918                            case 'p':
919                            case 'P':
920                            case 'b':
921                            case 'B':
922                            case 's':
923                            case 'S':
924                                    rc->num_frames++;
925                                    break;
926                            default:
927                                    DPRINTF(XVID_DEBUG_RC,
928                                                    "[xvid rc] -- WARNING: L%d unknown frame type used (%c).\n",
929                                                    lines, type);
930                            }
931          }else{          }else{
932              rc->avg_length[i] = rc->tot_scaled_length[i] / rc->count[i] / rc->movie_curve;                                  DPRINTF(XVID_DEBUG_RC,
933                                                    "[xvid rc] -- WARNING: L%d misses some stat fields (%d).\n",
934                                                    lines, 7-fields);
935          }          }
936    
937                    /* Free the line buffer */
938                    free(line);
939      }      }
940    
941      /* alt curve stuff here */          /* We are done with the file */
942            fclose(f);
943    
944            return(0);
945    }
946    
947      if (rc->param.use_alt_curve) {  /* open stats file(s) and read into rc->stats array */
948          const double avg_pvop = rc->avg_length[XVID_TYPE_PVOP-1];  static int
949          const uint64_t tot_pvop = rc->tot_length[XVID_TYPE_PVOP-1];  statsfile_load(rc_2pass2_t *rc, char * filename)
950          const uint64_t tot_bvop = rc->tot_length[XVID_TYPE_BVOP-1];  {
951          const uint64_t tot_scaled_pvop = rc->tot_scaled_length[XVID_TYPE_PVOP-1];          FILE * f;
952          const uint64_t tot_scaled_bvop = rc->tot_scaled_length[XVID_TYPE_BVOP-1];          int processed_entries;
953    
954                  rc->alt_curve_low = avg_pvop - avg_pvop * (double)rc->param.alt_curve_low_dist / 100.0;          /* Opens the file */
955                  rc->alt_curve_low_diff = avg_pvop - rc->alt_curve_low;          if ((f = fopen(filename, "rb"))==NULL)
956                  rc->alt_curve_high = avg_pvop + avg_pvop * (double)rc->param.alt_curve_high_dist / 100.0;                  return(-1);
                 rc->alt_curve_high_diff = rc->alt_curve_high - avg_pvop;  
957    
958          if (rc->param.alt_curve_use_auto) {          processed_entries = 0;
959              if (tot_bvop + tot_pvop > tot_scaled_bvop + tot_scaled_pvop) {          while(processed_entries < rc->num_frames) {
960                                  rc->param.alt_curve_min_rel_qual = (int)(100.0 - (100.0 - 100.0 /                  char type;
961                                          ((double)(tot_pvop + tot_bvop) / (double)(tot_scaled_pvop + tot_scaled_bvop))) * (double)rc->param.alt_curve_auto_str / 100.0);                  int fields;
962                    twopass_stat_t * s = &rc->stats[processed_entries];
963                    char *line, *ptr;
964    
965                                  if (rc->param.alt_curve_min_rel_qual < 20)                  /* Read the line from the file */
966                                          rc->param.alt_curve_min_rel_qual = 20;                  if((line = readline(f)) == NULL)
967              }else{                          break;
968                                  rc->param.alt_curve_min_rel_qual = 100;  
969              }                  /* We skip spaces */
970                    ptr = skipspaces(line);
971    
972                    /* Skip comment lines or empty lines */
973                    if(iscomment(ptr) || *ptr == '\0') {
974                            free(line);
975                            continue;
976          }          }
                 rc->alt_curve_mid_qual = (1.0 + (double)rc->param.alt_curve_min_rel_qual / 100.0) / 2.0;  
                 rc->alt_curve_qual_dev = 1.0 - rc->alt_curve_mid_qual;  
977    
978          if (rc->param.alt_curve_low_dist > 100) {                  /* Reset this field that is optional */
979                          switch(rc->param.alt_curve_type) {                  s->scaled_length = 0;
980              case XVID_CURVE_SINE: // Sine Curve (high aggressiveness)  
981                                  rc->alt_curve_qual_dev *= 2.0 / (1.0 + sin(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff)));                  /* Convert the fields */
982                                  rc->alt_curve_mid_qual = 1.0 - rc->alt_curve_qual_dev * sin(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff));                  fields = sscanf(ptr,
983                                                    "%c %d %d %d %d %d %d %d\n",
984                                                    &type,
985                                                    &s->quant,
986                                                    &s->blks[0], &s->blks[1], &s->blks[2],
987                                                    &s->length, &s->invariant /* not really yet */,
988                                                    &s->scaled_length);
989    
990                    /* Free line buffer, we don't need it anymore */
991                    free(line);
992    
993                    /* Fail silently, this has probably been warned in
994                     * statsfile_count_frames */
995                    if(fields != 7 && fields != 8)
996                            continue;
997    
998                    /* Convert frame type and compute the invariant length part */
999                    switch(type) {
1000                    case 'i':
1001                    case 'I':
1002                            s->type = XVID_TYPE_IVOP;
1003                            s->invariant /= INVARIANT_HEADER_PART_IVOP;
1004                                  break;                                  break;
1005                          case XVID_CURVE_LINEAR: // Linear (medium aggressiveness)                  case 'p':
1006                                  rc->alt_curve_qual_dev *= 2.0 / (1.0 + avg_pvop / rc->alt_curve_low_diff);                  case 'P':
1007                                  rc->alt_curve_mid_qual = 1.0 - rc->alt_curve_qual_dev * avg_pvop / rc->alt_curve_low_diff;                  case 's':
1008                    case 'S':
1009                            s->type = XVID_TYPE_PVOP;
1010                            s->invariant /= INVARIANT_HEADER_PART_PVOP;
1011                                  break;                                  break;
1012                          case XVID_CURVE_COSINE: // Cosine Curve (low aggressiveness)                  case 'b':
1013                                  rc->alt_curve_qual_dev *= 2.0 / (1.0 + (1.0 - cos(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff))));                  case 'B':
1014                                  rc->alt_curve_mid_qual = 1.0 - rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff)));                          s->type = XVID_TYPE_BVOP;
1015                            s->invariant /= INVARIANT_HEADER_PART_BVOP;
1016                            break;
1017                    default:
1018                            /* Same as before, fail silently */
1019                            continue;
1020                          }                          }
1021    
1022                    /* Ok it seems it's been processed correctly */
1023                    processed_entries++;
1024                  }                  }
1025    
1026            /* Close the file */
1027            fclose(f);
1028    
1029            return(0);
1030      }      }
     /* --- */  
1031    
1032    /* pre-process the statistics data
1033     * - for each type, count, tot_length, min_length, max_length
1034     * - set keyframes_locations, tot_prescaled */
1035    static void
1036    first_pass_stats_prepare_data(rc_2pass2_t * rc)
1037    {
1038            int i,j;
1039    
1040      total1=total2=0;          /* *rc fields initialization
1041      for (i=0; i<rc->num_frames; i++) {           * NB: INT_MAX and INT_MIN are used in order to be immediately replaced
1042          stat_t * s = &rc->stats[i];           *     with real values of the 1pass */
1043            for (i=0; i<3; i++) {
1044                    rc->count[i]=0;
1045                    rc->tot_length[i] = 0;
1046                    rc->tot_invariant[i] = 0;
1047                    rc->min_length[i] = INT_MAX;
1048            }
1049    
1050          if (s->type != XVID_TYPE_IVOP) {          rc->max_length = INT_MIN;
1051              double dbytes,dbytes2;          rc->tot_weighted = 0;
1052    
1053              dbytes = s->scaled_length / rc->movie_curve;          /* Loop through all frames and find/compute all the stuff this function
1054              dbytes2 = 0; /* XXX: warning */           * is supposed to do */
1055              total1 += dbytes;          for (i=j=0; i<rc->num_frames; i++) {
1056              if (s->type == XVID_TYPE_BVOP)                  twopass_stat_t * s = &rc->stats[i];
                 dbytes *= rc->avg_length[XVID_TYPE_PVOP-1] / rc->avg_length[XVID_TYPE_BVOP-1];  
1057    
1058              if (rc->param.use_alt_curve) {                  rc->count[s->type-1]++;
1059                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                  rc->tot_length[s->type-1] += s->length;
1060                    rc->tot_invariant[s->type-1] += s->invariant;
1061                    if (s->zone_mode != XVID_ZONE_QUANT)
1062                            rc->tot_weighted += (int)(s->weight*(s->length - s->invariant));
1063    
1064                      if (dbytes >= rc->alt_curve_high) {                  if (s->length < rc->min_length[s->type-1]) {
1065                                                  dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev);                          rc->min_length[s->type-1] = s->length;
                     }else{  
                                                 switch(rc->param.alt_curve_type) {  
                         case XVID_CURVE_SINE :  
                                                     dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * sin(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_high_diff)));  
                                                         break;  
                         case XVID_CURVE_LINEAR :  
                                                     dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) / rc->alt_curve_high_diff);  
                                                         break;  
                                                 case XVID_CURVE_COSINE :  
                                                     dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_high_diff))));  
1066                                                  }                                                  }
1067    
1068                    if (s->length > rc->max_length) {
1069                            rc->max_length = s->length;
1070                                          }                                          }
1071                  }else{  
1072                      if (dbytes <= rc->alt_curve_low) {                  if (s->type == XVID_TYPE_IVOP) {
1073                                                  dbytes2 = dbytes;                          rc->keyframe_locations[j] = i;
1074                      }else{                          j++;
                                                 switch(rc->param.alt_curve_type) {  
                                                 case XVID_CURVE_SINE :  
                                                     dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * sin(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_low_diff)));  
                                                         break;  
                                                 case XVID_CURVE_LINEAR :  
                                                     dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) / rc->alt_curve_low_diff);  
                                                         break;  
                                                 case XVID_CURVE_COSINE :  
                                                     dbytes2 = dbytes * (rc->alt_curve_mid_qual + rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_low_diff))));  
1075                                                  }                                                  }
1076                                          }                                          }
1077    
1078            /* NB:
1079             * The "per sequence" overflow system considers a natural sequence to be
1080             * formed by all frames between two iframes, so if we want to make sure
1081             * the system does not go nuts during last sequence, we force the last
1082             * frame to appear in the keyframe locations array. */
1083            rc->keyframe_locations[j] = i;
1084    
1085            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Min 1st pass IFrame length: %d\n", rc->min_length[0]);
1086            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Min 1st pass PFrame length: %d\n", rc->min_length[1]);
1087            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Min 1st pass BFrame length: %d\n", rc->min_length[2]);
1088                  }                  }
1089    
1090    /* calculate zone weight "center" */
1091    static void
1092    zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)
1093    {
1094            int i,j;
1095            int n = 0;
1096    
1097            rc->tot_quant = 0;
1098            rc->tot_quant_invariant = 0;
1099    
1100              }else{          if (create->num_zones == 0) {
1101                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                  for (j = 0; j < rc->num_frames; j++) {
1102                      dbytes2=((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_high / 100.0);                          rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1103                  }else{                          rc->stats[j].weight = 1.0;
                                 dbytes2 = ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_low / 100.0);  
1104                  }                  }
1105                    n += rc->num_frames;
1106              }              }
1107    
1108              if (s->type == XVID_TYPE_BVOP) {  
1109                              dbytes2 *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];          for(i=0; i < create->num_zones; i++) {
1110                              if (dbytes2 < rc->min_length[XVID_TYPE_BVOP-1])  
1111                                      dbytes2 = rc->min_length[XVID_TYPE_BVOP-1];                  int next = (i+1<create->num_zones) ? create->zones[i+1].frame : rc->num_frames;
1112              }else{  
1113                              if (dbytes2 < rc->min_length[XVID_TYPE_PVOP-1])                  /* Zero weight make no sense */
1114                                      dbytes2 = rc->min_length[XVID_TYPE_PVOP-1];                  if (create->zones[i].increment == 0) create->zones[i].increment = 1;
1115                    /* And obviously an undetermined infinite makes even less sense */
1116                    if (create->zones[i].base == 0) create->zones[i].base = 1;
1117    
1118                    if (i==0 && create->zones[i].frame > 0) {
1119                            for (j = 0; j < create->zones[i].frame && j < rc->num_frames; j++) {
1120                                    rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1121                                    rc->stats[j].weight = 1.0;
1122              }              }
1123              total2 += dbytes2;                          n += create->zones[i].frame;
1124          }          }
1125    
1126                    if (create->zones[i].mode == XVID_ZONE_WEIGHT) {
1127                            for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {
1128                                    rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1129                                    rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;
1130      }      }
1131                            next -= create->zones[i].frame;
1132                            n += next;
1133                    } else{  /* XVID_ZONE_QUANT */
1134                            for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {
1135                                    rc->stats[j].zone_mode = XVID_ZONE_QUANT;
1136                                    rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;
1137                                    rc->tot_quant += rc->stats[j].length;
1138                                    rc->tot_quant_invariant += rc->stats[j].invariant;
1139                            }
1140                    }
1141            }
1142    }
1143    
1144    
1145    /* scale the curve */
1146    static void
1147    first_pass_scale_curve_internal(rc_2pass2_t *rc)
1148    {
1149            int64_t target;
1150            int64_t total_invariant;
1151            double scaler;
1152            int i, num_MBs;
1153    
1154            /* We only scale texture data ! */
1155            total_invariant  = rc->tot_invariant[XVID_TYPE_IVOP-1];
1156            total_invariant += rc->tot_invariant[XVID_TYPE_PVOP-1];
1157            total_invariant += rc->tot_invariant[XVID_TYPE_BVOP-1];
1158            /* don't forget to substract header bytes used in quant zones, otherwise we
1159             * counting them twice */
1160            total_invariant -= rc->tot_quant_invariant;
1161    
1162            /* We remove the bytes used by the fixed quantizer zones during first pass
1163             * with the same quants, so we know very precisely how much that
1164             * represents */
1165            target  = rc->target;
1166            target -= rc->tot_quant;
1167    
1168            /* Let's compute a linear scaler in order to perform curve scaling */
1169            scaler = (double)(target - total_invariant) / (double)(rc->tot_weighted);
1170    
1171    #ifdef SMART_OVERFLOW_SETTING
1172            if (scaler > 0.9) {
1173                    rc->param.max_overflow_degradation *= 5;
1174                    rc->param.max_overflow_improvement *= 5;
1175                    rc->param.overflow_control_strength *= 3;
1176            } else if (scaler > 0.6) {
1177                    rc->param.max_overflow_degradation *= 2;
1178                    rc->param.max_overflow_improvement *= 2;
1179                    rc->param.overflow_control_strength *= 2;
1180            } else {
1181                    rc->min_quant = 2;
1182            }
1183    #endif
1184    
1185            /* Compute min frame lengths (for each frame type) according to the number
1186             * of MBs. We sum all block type counters of frame 0, this gives us the
1187             * number of MBs.
1188             *
1189             * We compare these hardcoded values with observed values in first pass
1190             * (determined in pre_process0).Then we keep the real minimum. */
1191    
1192            /* Number of MBs */
1193            num_MBs  = rc->stats[0].blks[0];
1194            num_MBs += rc->stats[0].blks[1];
1195            num_MBs += rc->stats[0].blks[2];
1196    
1197            /* Minimum for I frames */
1198            if(rc->min_length[XVID_TYPE_IVOP-1] > ((num_MBs*22) + 240) / 8)
1199                    rc->min_length[XVID_TYPE_IVOP-1] = ((num_MBs*22) + 240) / 8;
1200    
1201            /* Minimum for P/S frames */
1202            if(rc->min_length[XVID_TYPE_PVOP-1] > ((num_MBs) + 88)  / 8)
1203                    rc->min_length[XVID_TYPE_PVOP-1] = ((num_MBs) + 88)  / 8;
1204    
1205            /* Minimum for B frames */
1206            if(rc->min_length[XVID_TYPE_BVOP-1] > 8)
1207                    rc->min_length[XVID_TYPE_BVOP-1] = 8;
1208    
1209      rc->curve_comp_scale = total1 / total2;          /* Perform an initial scale pass.
1210             *
1211             * If a frame size is scaled underneath our hardcoded minimums, then we
1212             * force the frame size to the minimum, and deduct the original & scaled
1213             * frame length from the original and target total lengths */
1214            for (i=0; i<rc->num_frames; i++) {
1215                    twopass_stat_t * s = &rc->stats[i];
1216                    int len;
1217    
1218      if (!rc->param.use_alt_curve) {                  /* No need to scale frame length for which a specific quantizer is
1219          DPRINTF(XVID_DEBUG_RC, "middle frame size for asymmetric curve compression: %i\n",                   * specified thanks to zones */
1220              (int)(rc->avg_length[XVID_TYPE_PVOP-1] * rc->curve_comp_scale));                  if (s->zone_mode == XVID_ZONE_QUANT) {
1221                            s->scaled_length = s->length;
1222                            continue;
1223      }      }
1224    
1225      if (rc->param.use_alt_curve) {                  /* Compute the scaled length -- only non invariant data length is scaled */
1226          int bonus_bias = rc->param.alt_curve_bonus_bias;                  len = s->invariant + (int)((double)(s->length-s->invariant) * scaler * s->weight);
         int oldquant = 1;  
   
             if (rc->param.alt_curve_use_auto_bonus_bias)  
                     bonus_bias = rc->param.alt_curve_min_rel_qual;  
1227    
1228              rc->alt_curve_curve_bias_bonus = (total1 - total2) * (double)bonus_bias / 100.0 / (double)(rc->num_frames /* - credits_frames */ - rc->num_keyframes);                  /* Compare with the computed minimum */
1229              rc->curve_comp_scale = ((total1 - total2) * (1.0 - (double)bonus_bias / 100.0) + total2) / total2;                  if (len < rc->min_length[s->type-1]) {
1230                            /* This is a 'forced size' frame, set its frame size to the
1231                             * computed minimum */
1232                            s->scaled_length = rc->min_length[s->type-1];
1233    
1234                            /* Remove both scaled and original size from their respective
1235                             * total counters, as we prepare a second pass for 'regular'
1236                             * frames */
1237                            target -= s->scaled_length;
1238                    } else {
1239                            /* Do nothing for now, we'll scale this later */
1240                            s->scaled_length = 0;
1241                    }
1242            }
1243    
1244          /* special info for alt curve:  bias bonus and quantizer thresholds */          /* The first pass on data substracted all 'forced size' frames from the
1245             * total counters. Now, it's possible to scale the 'regular' frames. */
1246    
1247                  DPRINTF(XVID_DEBUG_RC, "avg scaled framesize:%i", (int)rc->avg_length[XVID_TYPE_PVOP-1]);          /* Scaling factor for 'regular' frames */
1248                  DPRINTF(XVID_DEBUG_RC, "bias bonus:%i bytes", (int)rc->alt_curve_curve_bias_bonus);          scaler = (double)(target - total_invariant) / (double)(rc->tot_weighted);
1249    
1250                  for (i=1; i <= (int)(rc->alt_curve_high*2)+1; i++) {          /* Do another pass with the new scaler */
1251              double curve_temp, dbytes;          for (i=0; i<rc->num_frames; i++) {
1252              int newquant;                  twopass_stat_t * s = &rc->stats[i];
1253    
1254              dbytes = i;                  /* Ignore frame with forced frame sizes */
1255                          if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                  if (s->scaled_length == 0)
1256                  if (dbytes >= rc->alt_curve_high) {                          s->scaled_length = s->invariant + (int)((double)(s->length-s->invariant) * scaler * s->weight);
                                         curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev);  
                 }else{  
                                         switch(rc->param.alt_curve_type)  
                                         {  
                                         case XVID_CURVE_SINE :  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * sin(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_high_diff)));  
                                                 break;  
                                         case XVID_CURVE_LINEAR :  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) / rc->alt_curve_high_diff);  
                                                 break;  
                                         case XVID_CURVE_COSINE :  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_high_diff))));  
1257                                          }                                          }
1258    
1259            /* Job done */
1260            return;
1261                                  }                                  }
1262                          }else{  
1263                  if (dbytes <= rc->alt_curve_low) {  /* Apply all user settings to the scaled curve
1264                                          curve_temp = dbytes;   * This implies:
1265                  }else{   *   keyframe boosting
1266                                          switch(rc->param.alt_curve_type)   *   high/low compression */
1267    static void
1268    scaled_curve_apply_advanced_parameters(rc_2pass2_t * rc)
1269                                          {                                          {
1270                                          case XVID_CURVE_SINE :          int i;
1271                                                  curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * sin(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_low_diff)));          int64_t ivop_boost_total;
                                                 break;  
                                         case XVID_CURVE_LINEAR :  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) / rc->alt_curve_low_diff);  
                                                 break;  
                                         case XVID_CURVE_COSINE :  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual + rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_low_diff))));  
                                         }  
                                 }  
                         }  
1272    
1273                          if (rc->movie_curve > 1.0)          /* Reset the rate controller (per frame type) total byte counters */
1274                                  dbytes *= rc->movie_curve;          for (i=0; i<3; i++) rc->tot_scaled_length[i] = 0;
1275    
1276                          newquant = (int)(dbytes * 2.0 / (curve_temp * rc->curve_comp_scale + rc->alt_curve_curve_bias_bonus));          /* Compute total bytes for each frame type */
1277                          if (newquant > 1) {          for (i=0; i<rc->num_frames;i++) {
1278                                  if (newquant != oldquant) {                  twopass_stat_t *s = &rc->stats[i];
1279                      int percent = (int)((i - rc->avg_length[XVID_TYPE_PVOP-1]) * 100.0 / rc->avg_length[XVID_TYPE_PVOP-1]);                  rc->tot_scaled_length[s->type-1] += s->scaled_length;
                                         oldquant = newquant;  
                                         DPRINTF(XVID_DEBUG_RC, "quant:%i threshold at %i : %i percent", newquant, i, percent);  
                                 }  
                         }  
1280                  }                  }
1281    
1282      }          /* First we compute the total amount of bits needed, as being described by
1283             * the scaled distribution. During this pass over the complete stats data,
1284             * we see how much bits two user settings will get/give from/to p&b frames:
1285             *  - keyframe boosting
1286             *  - keyframe distance penalty */
1287            rc->KF_idx = 0;
1288            ivop_boost_total = 0;
1289            for (i=0; i<rc->num_frames; i++) {
1290                    twopass_stat_t * s = &rc->stats[i];
1291    
1292      rc->overflow = 0;                  /* Some more work is needed for I frames */
1293      rc->KFoverflow = 0;                  if (s->type == XVID_TYPE_IVOP) {
1294      rc->KFoverflow_partial = 0;                          int ivop_boost;
     rc->KF_idx = 1;  
 }  
1295    
1296                            /* Accumulate bytes needed for keyframe boosting */
1297                            ivop_boost = s->scaled_length*rc->param.keyframe_boost/100;
1298    
1299    #if 0 /* ToDo: decide how to apply kfthresholding */
1300    #endif
1301                            /* If the frame size drops under the minimum length, then cap ivop_boost */
1302                            if (ivop_boost + s->scaled_length < rc->min_length[XVID_TYPE_IVOP-1])
1303                                    ivop_boost = rc->min_length[XVID_TYPE_IVOP-1] - s->scaled_length;
1304    
1305                            /* Accumulate the ivop boost */
1306                            ivop_boost_total += ivop_boost;
1307    
1308  static int rc_2pass2_create(xvid_plg_create_t * create, rc_2pass2_t ** handle)                          /* Don't forget to update the keyframe index */
1309  {                          rc->KF_idx++;
1310      xvid_plugin_2pass2_t * param = (xvid_plugin_2pass2_t *)create->param;                  }
1311      rc_2pass2_t * rc;          }
     int i;  
1312    
1313      rc = malloc(sizeof(rc_2pass2_t));          /* Initialize the IBoost tax ratio for P/S/B frames
1314      if (rc == NULL)           *
1315          return XVID_ERR_MEMORY;           * This ratio has to be applied to p/b/s frames in order to reserve
1316             * additional bits for keyframes (keyframe boosting) or if too much
1317             * keyframe distance is applied, bits retrieved from the keyframes.
1318             *
1319             * ie pb_length *= rc->pb_iboost_tax_ratio;
1320             *
1321             *    gives the ideal length of a p/b frame */
1322    
1323      rc->param = *param;          /* Compute the total length of p/b/s frames (temporary storage into
1324             * movie_curve) */
1325            rc->pb_iboost_tax_ratio  = (double)rc->tot_scaled_length[XVID_TYPE_PVOP-1];
1326            rc->pb_iboost_tax_ratio += (double)rc->tot_scaled_length[XVID_TYPE_BVOP-1];
1327    
1328            /* Compute the ratio described above
1329             *     taxed_total = sum(0, n, tax*scaled_length)
1330             * <=> taxed_total = tax.sum(0, n, scaled_length)
1331             * <=> tax = taxed_total / original_total */
1332            rc->pb_iboost_tax_ratio =
1333                    (rc->pb_iboost_tax_ratio - ivop_boost_total) /
1334                    rc->pb_iboost_tax_ratio;
1335    
1336      if (rc->param.keyframe_boost <= 0) rc->param.keyframe_boost = 0;          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- IFrame boost tax ratio:%.2f\n",
1337      if (rc->param.payback_method <= 0) rc->param.payback_method = XVID_PAYBACK_PROP;                          rc->pb_iboost_tax_ratio);
     if (rc->param.bitrate_payback_delay <= 0) rc->param.bitrate_payback_delay = 250;  
     if (rc->param.curve_compression_high <= 0) rc->param.curve_compression_high = 0;  
     if (rc->param.curve_compression_low <= 0) rc->param.curve_compression_low = 0;  
     if (rc->param.max_overflow_improvement <= 0) rc->param.max_overflow_improvement = 60;  
     if (rc->param.max_overflow_degradation <= 0) rc->param.max_overflow_degradation = 60;  
   
     if (rc->param.use_alt_curve <= 0) rc->param.use_alt_curve = 0;  
     if (rc->param.alt_curve_high_dist <= 0) rc->param.alt_curve_high_dist = 500;  
     if (rc->param.alt_curve_low_dist <= 0) rc->param.alt_curve_low_dist = 90;  
     if (rc->param.alt_curve_use_auto <= 0) rc->param.alt_curve_use_auto = 1;  
     if (rc->param.alt_curve_auto_str <= 0) rc->param.alt_curve_auto_str = 30;  
     if (rc->param.alt_curve_type <= 0) rc->param.alt_curve_type = XVID_CURVE_LINEAR;  
     if (rc->param.alt_curve_min_rel_qual <= 0) rc->param.alt_curve_min_rel_qual = 50;  
     if (rc->param.alt_curve_use_auto_bonus_bias <= 0) rc->param.alt_curve_use_auto_bonus_bias = 1;  
     if (rc->param.alt_curve_bonus_bias <= 0) rc->param.alt_curve_bonus_bias = 50;  
   
     if (rc->param.kftreshold <= 0) rc->param.kftreshold = 10;  
     if (rc->param.kfreduction <= 0) rc->param.kfreduction = 20;  
     if (rc->param.min_key_interval <= 0) rc->param.min_key_interval = 300;  
1338    
1339      if (!det_stats_length(rc, param->filename)){          /* Compute the average size of frames per frame type */
1340          DPRINTF(XVID_DEBUG_RC,"fopen %s failed\n", param->filename);          for(i=0; i<3; i++) {
1341          free(rc);                  /* Special case for missing type or weird case */
1342          return XVID_ERR_FAIL;                  if (rc->count[i] == 0 || rc->pb_iboost_tax_ratio == 0) {
1343      }                          rc->avg_length[i] = 1;
1344                    } else {
1345                            rc->avg_length[i] = rc->tot_scaled_length[i];
1346    
1347      if ((rc->stats = malloc(rc->num_frames * sizeof(stat_t))) == NULL) {                          if (i == (XVID_TYPE_IVOP-1)) {
1348          free(rc);                                  /* I Frames total has to be added the boost total */
1349          return XVID_ERR_MEMORY;                                  rc->avg_length[i] += ivop_boost_total;
1350                            } else {
1351                                    /* P/B frames has to taxed */
1352                                    rc->avg_length[i] *= rc->pb_iboost_tax_ratio;
1353      }      }
1354    
1355      /* XXX: do we need an addition location */                          /* Finally compute the average frame size */
1356      if ((rc->keyframe_locations = malloc((rc->num_keyframes + 1) * sizeof(int))) == NULL) {                          rc->avg_length[i] /= (double)rc->count[i];
         free(rc->stats);  
         free(rc);  
         return XVID_ERR_MEMORY;  
1357      }      }
   
     if (!load_stats(rc, param->filename)) {  
         DPRINTF(XVID_DEBUG_RC,"fopen %s failed\n", param->filename);  
         free(rc->keyframe_locations);  
         free(rc->stats);  
         free(rc);  
         return XVID_ERR_FAIL;  
1358      }      }
1359    
1360      /* pre-process our stats */          /* Assymetric curve compression */
1361            if (rc->param.curve_compression_high || rc->param.curve_compression_low) {
1362                    double symetric_total;
1363                    double assymetric_delta_total;
1364    
1365          if (rc->num_frames  < create->fbase/create->fincr) {                  /* Like I frame boosting, assymetric curve compression modifies the total
1366                  rc->target = rc->param.bitrate / 8;     /* one second */                   * amount of needed bits, we must compute the ratio so we can prescale
1367          }else{                   lengths */
1368                  rc->target = (rc->param.bitrate * rc->num_frames * create->fincr) / (create->fbase * 8);                  symetric_total = 0;
1369          }                  assymetric_delta_total = 0;
1370                    for (i=0; i<rc->num_frames; i++) {
1371                            double assymetric_delta;
1372                            double dbytes;
1373                            twopass_stat_t * s = &rc->stats[i];
1374    
1375      DPRINTF(XVID_DEBUG_RC, "rc->target : %i\n", rc->target);                          /* I Frames are not concerned by assymetric scaling */
1376                            if (s->type == XVID_TYPE_IVOP)
1377                                    continue;
1378    
1379          rc->target -= rc->num_frames*24;        /* avi file header */                          /* During the real run, we would have to apply the iboost tax */
1380                            dbytes = s->scaled_length * rc->pb_iboost_tax_ratio;
1381    
1382                            /* Update the symmetric curve compression total */
1383                            symetric_total += dbytes;
1384    
1385          pre_process0(rc);                          /* Apply assymetric curve compression */
1386                            if (dbytes > rc->avg_length[s->type-1])
1387                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * (double)rc->param.curve_compression_high / 100.0f;
1388                            else
1389                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * (double)rc->param.curve_compression_low  / 100.0f;
1390    
1391          if (rc->param.bitrate) {                          /* Cap to the minimum frame size if needed */
1392          zone_process(rc, create);                          if (dbytes + assymetric_delta < rc->min_length[s->type-1])
1393                  internal_scale(rc);                                  assymetric_delta = rc->min_length[s->type-1] - dbytes;
1394      }else{  
1395          /* external scaler: ignore zone */                          /* Accumulate after assymetric curve compression */
1396          for (i=0;i<rc->num_frames;i++) {                          assymetric_delta_total += assymetric_delta;
             rc->stats[i].zone_mode = XVID_ZONE_WEIGHT;  
             rc->stats[i].weight = 1.0;  
         }  
         rc->avg_weight = 1.0;  
         rc->tot_quant = 0;  
1397      }      }
         pre_process1(rc);  
1398    
1399      for (i=0; i<32;i++) {                  /* Compute the tax that all p/b frames have to pay in order to respect the
1400          rc->pquant_error[i] = 0;                   * bit distribution changes that the assymetric compression curve imposes
1401          rc->bquant_error[i] = 0;                   * We want assymetric_total = sum(0, n-1, tax.scaled_length)
1402          rc->quant_count[i] = 0;                   *      ie assymetric_total = ratio.sum(0, n-1, scaled_length)
1403                     *         ratio = assymetric_total / symmetric_total */
1404                    rc->assymetric_tax_ratio = ((double)symetric_total - (double)assymetric_delta_total) / (double)symetric_total;
1405            } else {
1406                    rc->assymetric_tax_ratio = 1.0f;
1407      }      }
1408    
1409      rc->fq_error = 0;          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Assymetric tax ratio:%.2f\n", rc->assymetric_tax_ratio);
1410    
1411      *handle = rc;          /* Last bits that need to be reset */
1412          return(0);          rc->overflow = 0;
1413            rc->KFoverflow = 0;
1414            rc->KFoverflow_partial = 0;
1415            rc->KF_idx = 0;
1416            rc->desired_total = 0;
1417            rc->real_total = 0;
1418    
1419            /* Job done */
1420            return;
1421  }  }
1422    
1423    
1424  static int rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy)  #ifdef VBV
 {  
     free(rc->keyframe_locations);  
     free(rc->stats);  
         free(rc);  
         return(0);  
 }  
1425    
1426    /*****************************************************************************
1427     * VBV compliancy check and scale
1428     * MPEG-4 standard specifies certain restrictions for bitrate/framesize in VBR
1429     * to enable playback on devices with limited readspeed and memory (and which
1430     * aren't...)
1431     *
1432     * DivX profiles have 2 criteria: VBV as in MPEG standard
1433     *                                a limit on peak bitrate for any 3 seconds
1434     *
1435     * But if VBV is fulfilled, peakrate is automatically fulfilled in any profile
1436     * define so far, so we check for it (for completeness) but correct only VBV
1437     *
1438     *****************************************************************************/
1439    
1440    #define VBV_COMPLIANT 0
1441    #define VBV_UNDERFLOW 1 /* video buffer runs empty */
1442    #define VBV_OVERFLOW 2  /* doesn't exist for VBR encoding */
1443    #define VBV_PEAKRATE 4  /* peak bitrate (within 3s) violated */
1444    
1445  static int rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)  static int check_curve_for_vbv_compliancy(rc_2pass2_t * rc, const float fps)
1446  {  {
1447      stat_t * s = &rc->stats[data->frame_num];  /* We do all calculations in float, for higher accuracy, and bytes for convenience
     int overflow;  
     int desired;  
     double dbytes;  
     double curve_temp;  
     int capped_to_max_framesize = 0;  
   
     if (data->quant <= 0) {  
1448    
1449          if (s->zone_mode == XVID_ZONE_QUANT) {     typical values from DivX Home Theater profile:
1450       vbvsize= 384*1024 (384kB), vbvinitial= 288*1024 (75% fill)
1451       maxrate= 4000000 (4MBps), peakrate= 10000000 (10MBps)
1452    
1453              rc->fq_error += s->weight;     PAL: offset3s = 75 (3 seconds of 25fps)
1454              data->quant = (int)rc->fq_error;     NTSC: offset3s = 90 (3 seconds of 29.97fps) or 72 (3 seconds of 23.976fps)
1455              rc->fq_error -= data->quant;  */
1456    
1457              s->desired_length = s->length;    const float vbvsize = (float)rc->param.vbvsize/8.f;
1458      float vbvfill = (float)rc->param.vbvinitial/8.f;
1459    
1460          }else { /* XVID_ZONE_WEIGHT */    const float maxrate = (float)rc->param.vbv_maxrate;
1461      const float peakrate = (float)rc->param.vbv_peakrate;
1462      const float r0 = (int)(maxrate/fps+0.5)/8.f;
1463    
1464              if (data->frame_num >= rc->num_frames) {    int bytes3s = 0;
1465                  /* insufficent stats data */    int offset3s = (int)(3.f*fps+0.5);
                 return 0;  
             }  
1466    
1467              overflow = rc->overflow / 8;        /* XXX: why by 8 */    int i;
1468      for (i=0; i<rc->num_frames; i++) {
1469    /* DivX 3s peak bitrate check  */
1470    
1471              if (s->type == XVID_TYPE_IVOP) {        /* XXX: why */      bytes3s += rc->stats[i].scaled_length;
1472                  overflow = 0;      if (i>=offset3s)
1473              }        bytes3s -= rc->stats[i-offset3s].scaled_length;
1474    
1475              desired = s->scaled_length;      if (8.f*bytes3s > 3*peakrate)
1476          return VBV_PEAKRATE;
1477    
1478              dbytes = desired;  /* update vbv fill level */
             if (s->type == XVID_TYPE_IVOP) {  
                 dbytes += desired * rc->param.keyframe_boost / 100;  
             }  
             dbytes /= rc->movie_curve;  
1479    
1480              if (s->type == XVID_TYPE_BVOP) {      vbvfill += r0 - rc->stats[i].scaled_length;
                 dbytes *= rc->avg_length[XVID_TYPE_PVOP-1] / rc->avg_length[XVID_TYPE_BVOP-1];  
             }  
1481    
1482              if (rc->param.payback_method == XVID_PAYBACK_BIAS) {  /* this check is _NOT_ an "overflow"! only reading from disk stops then */
1483                  desired =(int)(rc->curve_comp_error / rc->param.bitrate_payback_delay);      if (vbvfill > vbvsize)
1484              }else{        vbvfill = vbvsize;
                         //printf("desired=%i, dbytes=%i\n", desired,dbytes);  
                         desired = (int)(rc->curve_comp_error * dbytes /  
                                 rc->avg_length[XVID_TYPE_PVOP-1] / rc->param.bitrate_payback_delay);  
                         //printf("desired=%i\n", desired);  
1485    
1486                          if (labs(desired) > fabs(rc->curve_comp_error)) {  /* but THIS would be an underflow. report it! */
1487                                  desired = (int)rc->curve_comp_error;      if (vbvfill < 0)
1488                          }        return VBV_UNDERFLOW;
1489              }              }
1490    
1491              rc->curve_comp_error -= desired;    return VBV_COMPLIANT;
1492    }
1493    /* idea: min(vbvfill) could be stored to print "minimum buffer fill" */
1494    
             /* alt curve */  
1495    
             curve_temp = 0; /* XXX: warning */  
1496    
1497              if (rc->param.use_alt_curve) {  static int scale_curve_for_vbv_compliancy(rc_2pass2_t * rc, const float fps)
1498                  if (s->type != XVID_TYPE_IVOP)  {  {
1499                      if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {  /* correct any VBV violations. Peak bitrate violations disappears
1500                          if (dbytes >= rc->alt_curve_high) {     by this automatically
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev);  
                         }else{  
                             switch(rc->param.alt_curve_type) {  
                                                 case XVID_CURVE_SINE :  
                                                     curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * sin(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_high_diff)));  
                                                         break;  
                                                 case XVID_CURVE_LINEAR :  
                                                     curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) / rc->alt_curve_high_diff);  
                                                         break;  
                                                 case XVID_CURVE_COSINE :  
                                                     curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_high_diff))));  
                                                 }  
                                         }  
                                 }else{  
                         if (dbytes <= rc->alt_curve_low){  
                                                 curve_temp = dbytes;  
                         }else{  
                                                 switch(rc->param.alt_curve_type) {  
                                                 case XVID_CURVE_SINE :  
                                                     curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * sin(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_low_diff)));  
                                                         break;  
                                                 case XVID_CURVE_LINEAR :  
                                                     curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) / rc->alt_curve_low_diff);  
                                                         break;  
                                                 case XVID_CURVE_COSINE :  
                                                     curve_temp = dbytes * (rc->alt_curve_mid_qual + rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_low_diff))));  
                             }  
                                         }  
                                 }  
                                 if (s->type == XVID_TYPE_BVOP)  
                                         curve_temp *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
1501    
1502                                  curve_temp = curve_temp * rc->curve_comp_scale + rc->alt_curve_curve_bias_bonus;     This implementation follows
1503    
1504                                  desired += ((int)curve_temp);     Westerink, Rajagopalan, Gonzales "Two-pass MPEG-2 variable-bitrate encoding"
1505                                  rc->curve_comp_error += curve_temp - (int)curve_temp;     IBM J. RES. DEVELOP. VOL 43, No. 4, July 1999, p.471--488
                         }else{  
                                 if (s->type == XVID_TYPE_BVOP)  
                                         dbytes *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
1506    
1507                                  desired += ((int)dbytes);     Thanks, guys! This paper rocks!!!
1508                                  rc->curve_comp_error += dbytes - (int)dbytes;  */
                         }  
1509    
1510              }else if ((rc->param.curve_compression_high + rc->param.curve_compression_low) &&   s->type != XVID_TYPE_IVOP) {  /*
1511        For each scene of len N, we have to check up to N^2 possible buffer fills.
1512        This works well with MPEG-2 where N==12 or so, but for MPEG-4 it's a
1513        little slow...
1514    */
1515      const float vbvsize = (float)rc->param.vbvsize/8.f;
1516      const float vbvinitial = (float)rc->param.vbvinitial/8.f;
1517    
1518                  curve_temp = rc->curve_comp_scale;    const float maxrate = 0.9*rc->param.vbv_maxrate;
1519                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {    const float vbvlow = 0.10f*vbvsize;
1520                      curve_temp *= ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_high / 100.0);    const float r0 = (int)(maxrate/fps+0.5)/8.f;
1521                  } else {  
1522                      curve_temp *= ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_low / 100.0);    int i,k,l,n,violation = 0;
1523      float *scenefactor;
1524      int *scenestart;
1525      int *scenelength;
1526    
1527    /* first step: determine how many "scenes" there are and store their boundaries
1528       we could get all this from existing keyframe_positions, somehow, but there we
1529       don't have a min_scenelength, and it's no big deal to get it again.  */
1530    
1531      const int min_scenelength = 50;
1532      int num_scenes = 0;
1533      int last_scene = -999;
1534      for (i=0; i<rc->num_frames; i++) {
1535        if ( (rc->stats[i].type == XVID_TYPE_IVOP) && (i-last_scene>min_scenelength) )
1536        {
1537          last_scene = i;
1538          num_scenes++;
1539                  }                  }
   
                 if (s->type == XVID_TYPE_BVOP){  
                     curve_temp *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
1540                  }                  }
1541    
1542                  desired += (int)curve_temp;    scenefactor = (float*)malloc( num_scenes*sizeof(float) );
1543                  rc->curve_comp_error += curve_temp - (int)curve_temp;    scenestart = (int*)malloc( num_scenes*sizeof(int) );
1544              }else{    scenelength = (int*)malloc( num_scenes*sizeof(int) );
                 if (s->type == XVID_TYPE_BVOP){  
                                 dbytes *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
                 }  
1545    
1546                          desired += (int)dbytes;    if ((!scenefactor) || (!scenestart) || (!scenelength) )
1547                          rc->curve_comp_error += dbytes - (int)dbytes;    {
1548        free(scenefactor);
1549        free(scenestart);
1550        free(scenelength);
1551        /* remember: free(0) is valid and does exactly nothing. */
1552        return -1;
1553              }              }
1554    
1555    /* count again and safe the length/position */
1556    
1557                  if (desired > s->length) {  /* if desired length exceeds the pass1 length.. */    num_scenes = 0;
1558                          rc->curve_comp_error += desired - s->length;    last_scene = -999;
1559                          desired = s->length;    for (i=0; i<rc->num_frames; i++) {
1560                  }else{      if ( (rc->stats[i].type == XVID_TYPE_IVOP) && (i-last_scene>min_scenelength) )
1561                  if (desired < rc->min_length[s->type-1]) {      {
1562                      if (s->type == XVID_TYPE_IVOP){        if (num_scenes>0)
1563                          rc->curve_comp_error -= rc->min_length[XVID_TYPE_IVOP-1] - desired;          scenelength[num_scenes-1]=i-last_scene;
1564                      }        scenestart[num_scenes]=i;
1565                      desired = rc->min_length[s->type-1];        num_scenes++;
1566          last_scene = i;
1567                  }                  }
1568                  }                  }
1569      scenelength[num_scenes-1]=i-last_scene;
1570    
1571              s->desired_length = desired;  /* second step: check for each scene, how much we can scale its frames up or down
1572       such that the VBV restriction is just fulfilled
1573    */
             /* if this keyframe is too close to the next, reduce it's byte allotment  
             XXX: why do we do this after setting the desired length  */  
1574    
                 if (s->type == XVID_TYPE_IVOP) {  
                         int KFdistance = rc->keyframe_locations[rc->KF_idx] - rc->keyframe_locations[rc->KF_idx - 1];  
1575    
1576                  if (KFdistance < rc->param.kftreshold) {  #define R(k,n) (((n)+1-(k))*r0)     /* how much enters the buffer between frame k and n */
1577      for (l=0; l<num_scenes;l++)
1578      {
1579        const int start = scenestart[l];
1580        const int length = scenelength[l];
1581        twopass_stat_t * frames = &rc->stats[start];
1582    
1583                      KFdistance = KFdistance - rc->param.min_key_interval;      float S0n,Skn;
1584        float f,minf = 99999.f;
1585    
1586                                  if (KFdistance >= 0) {      S0n=0.;
1587                          int KF_min_size;      for (n=0;n<=length-1;n++)
1588        {
1589          S0n += frames[n].scaled_length;
1590    
1591                                          KF_min_size = desired * (100 - rc->param.kfreduction) / 100;        k=0;
1592                                          if (KF_min_size < 1)        Skn = S0n;
1593                                                  KF_min_size = 1;        f = (R(k,n-1) + (vbvinitial - vbvlow)) / Skn;
1594          if (f < minf)
1595            minf = f;
1596    
1597                                          desired = KF_min_size + (desired - KF_min_size) * KFdistance /        for (k=1;k<=n;k++)
1598                                                  (rc->param.kftreshold - rc->param.min_key_interval);        {
1599            Skn -= frames[k].scaled_length;
1600    
1601                                          if (desired < 1)          f = (R(k,n-1) + (vbvsize - vbvlow)) / Skn;
1602                                                  desired = 1;          if (f < minf)
1603                                  }            minf = f;
1604                          }                          }
1605                  }                  }
1606    
1607              overflow = (int)((double)overflow * desired / rc->avg_length[XVID_TYPE_PVOP-1]);      /* special case: at the end, fill buffer up to vbvinitial again
1608           TODO: Allow other values for buffer fill between scenes
1609           e.g. if n=N is smallest f-value, then check for better value */
1610    
1611                  // Foxer: reign in overflow with huge frames      n=length;
1612                  if (labs(overflow) > labs(rc->overflow)) {      k=0;
1613                          overflow = rc->overflow;      Skn = S0n;
1614                  }      f = R(k,n-1)/Skn;
1615        if (f < minf)
1616          minf = f;
1617    
1618              // Foxer: make sure overflow doesn't run away      for (k=1;k<=n-1;k++)
1619        {
1620          Skn -= frames[k].scaled_length;
1621    
1622                  if (overflow > desired * rc->param.max_overflow_improvement / 100) {        f = (R(k,n-1) + (vbvinitial - vbvlow)) / Skn;
1623                          desired += (overflow <= desired) ? desired * rc->param.max_overflow_improvement / 100 :        if (f < minf)
1624                                  overflow * rc->param.max_overflow_improvement / 100;          minf = f;
                 }else if (overflow < desired * rc->param.max_overflow_degradation / -100){  
                         desired += desired * rc->param.max_overflow_degradation / -100;  
                 }else{  
                         desired += overflow;  
1625                  }                  }
1626    
1627              if (desired > rc->max_length) {  #ifdef VBV_DEBUG
1628                          capped_to_max_framesize = 1;      printf("Scene %d (Frames %d-%d): VBVfactor %f\n", l, start, start+length-1 , minf);
1629                          desired = rc->max_length;  #endif
                 }  
1630    
1631              // make sure to not scale below the minimum framesize      scenefactor[l] = minf;
             if (desired < rc->min_length[s->type-1]) {  
                 desired = rc->min_length[s->type-1];  
1632              }              }
1633    #undef R
1634    
1635    /* last step: now we know of any scene how much it can be scaled up or down without
1636       violating VBV. Next, distribute bits from the evil scenes to the good ones */
1637    
1638              // very 'simple' quant<->filesize relationship    do
1639              data->quant= (s->quant * s->length) / desired;    {
1640        float S_red = 0.f;    /* how much to redistribute */
1641        float S_elig = 0.f;   /* sum of bit for those scenes you can still swallow something*/
1642        int l;
1643    
1644                  if (data->quant < 1) {      for (l=0;l<num_scenes;l++)   /* check how much is wrong */
                         data->quant = 1;  
             } else if (data->quant > 31) {  
                         data->quant = 31;  
                 }  
                 else if (s->type != XVID_TYPE_IVOP)  
1645                  {                  {
1646                          // Foxer: aid desired quantizer precision by accumulating decision error      const int start = scenestart[l];
1647                          if (s->type== XVID_TYPE_BVOP) {      const int length = scenelength[l];
1648                                  rc->bquant_error[data->quant] += ((double)(s->quant * s->length) / desired) - data->quant;      twopass_stat_t * frames = &rc->stats[start];
1649    
1650                                  if (rc->bquant_error[data->quant] >= 1.0) {        if (scenefactor[l] == 1.) /* exactly 1 means "don't touch this anymore!" */
1651                                          rc->bquant_error[data->quant] -= 1.0;          continue;
                                         data->quant++;  
                                 }  
                         }else{  
                                 rc->pquant_error[data->quant] += ((double)(s->quant * s->length) / desired) - data->quant;  
1652    
1653                      if (rc->pquant_error[data->quant] >= 1.0) {        if (scenefactor[l] > 1.) /* within limits */
1654                                          rc->pquant_error[data->quant] -= 1.0;        {
1655                                          ++data->quant;          for (n= 0; n < length; n++)
1656              S_elig += frames[n].scaled_length;
1657                                  }                                  }
1658          else /* underflowing segment */
1659          {
1660            for (n= 0; n < length; n++)
1661            {
1662              float newbytes = (float)frames[n].scaled_length * scenefactor[l];
1663              S_red += (float)frames[n].scaled_length - (float)newbytes;
1664              frames[n].scaled_length =(int)newbytes;
1665            }
1666            scenefactor[l] = 1.f;
1667                          }                          }
1668                  }                  }
1669    
1670              /* cap to min/max quant */      if (S_red < 1.f)   /* no more underflows */
1671          break;
1672    
1673              if (data->quant < data->min_quant[s->type-1]) {      if (S_elig < 1.f)
1674                  data->quant = data->min_quant[s->type-1];      {
1675              }else if (data->quant > data->max_quant[s->type-1]) {  #ifdef VBV_DEBUG
1676                  data->quant = data->max_quant[s->type-1];        fprintf(stderr,"Everything underflowing. \n");
1677    #endif
1678          free(scenefactor);
1679          free(scenestart);
1680          free(scenelength);
1681          return -2;
1682              }              }
1683    
1684              /* subsequent p/b frame quants can only be +- 2 */      const float f_red = (1.f + S_red/S_elig);
                 if (s->type != XVID_TYPE_IVOP && rc->last_quant[s->type-1] && capped_to_max_framesize == 0) {  
1685    
1686                          if (data->quant > rc->last_quant[s->type-1] + 2) {  #ifdef VBV_DEBUG
1687                                  data->quant = rc->last_quant[s->type-1] + 2;      printf("Moving %.0f kB to avoid buffer underflow, correction factor: %.5f\n",S_red/1024.f,f_red);
1688                                  DPRINTF(XVID_DEBUG_RC, "p/b-frame quantizer prevented from rising too steeply");  #endif
                         }  
                         if (data->quant < rc->last_quant[s->type-1] - 2) {  
                                 data->quant = rc->last_quant[s->type-1] - 2;  
                                 DPRINTF(XVID_DEBUG_RC, "p/b-frame quantizer prevented from falling too steeply");  
                         }  
                 }  
1689    
1690                  if (capped_to_max_framesize == 0) {      violation=0;
1691                  rc->last_quant[s->type-1] = data->quant;      for (l=0; l<num_scenes; l++)   /* scale remaining scenes up to meet total size */
1692                  }      {
1693          const int start = scenestart[l];
1694          const int length = scenelength[l];
1695          twopass_stat_t * frames = &rc->stats[start];
1696    
1697          if (scenefactor[l] == 1.)
1698            continue;
1699    
1700          }   /* if */        /* there shouldn't be any segments with factor<1 left, so all the rest is >1 */
1701    
1702          for (n= 0; n < length; n++)
1703          {
1704            frames[n].scaled_length = (int)(frames[n].scaled_length * f_red + 0.5);
1705          }
1706    
1707          scenefactor[l] /= f_red;
1708          if (scenefactor[l] < 1.f)
1709            violation=1;
1710      }      }
1711    
1712      } while (violation);
1713    
1714      free(scenefactor);
1715      free(scenestart);
1716      free(scenelength);
1717      return 0;      return 0;
1718  }  }
1719    
1720    
1721    #endif
1722    
 static int rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)  
 {  
     stat_t * s = &rc->stats[data->frame_num];  
1723    
1724      if (data->frame_num >= rc->num_frames) {  /*****************************************************************************
1725          /* insufficent stats data */   * Still more low level stuff (nothing to do with stats treatment)
1726          return 0;   ****************************************************************************/
1727      }  
1728    /* This function returns an allocated string containing a complete line read
1729     * from the file starting at the current position */
1730    static char *
1731    readline(FILE *f)
1732    {
1733            char *buffer = NULL;
1734            int buffer_size = 0;
1735            int pos = 0;
1736    
1737      rc->quant_count[data->quant]++;          do {
1738                    int c;
1739    
1740      if (data->type == XVID_TYPE_IVOP) {                  /* Read a character from the stream */
1741          int kfdiff = (rc->keyframe_locations[rc->KF_idx] -      rc->keyframe_locations[rc->KF_idx - 1]);                  c = fgetc(f);
1742    
1743          rc->overflow += rc->KFoverflow;                  /* Is that EOF or new line ? */
1744          rc->KFoverflow = s->desired_length - data->length;                  if(c == EOF || c == '\n')
1745                            break;
1746    
1747          if (kfdiff > 1) {  // non-consecutive keyframes                  /* Do we have to update buffer ? */
1748              rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);                  if(pos >= buffer_size - 1) {
1749          }else{ // consecutive keyframes                          buffer_size += BUF_SZ;
1750                          rc->overflow += rc->KFoverflow;                          buffer = (char*)realloc(buffer, buffer_size);
1751                          rc->KFoverflow = 0;                          if (buffer == NULL)
1752                          rc->KFoverflow_partial = 0;                                  return(NULL);
         }  
         rc->KF_idx++;  
     }else{  
         // distribute part of the keyframe overflow  
         rc->overflow += s->desired_length - data->length + rc->KFoverflow_partial;  
         rc->KFoverflow -= rc->KFoverflow_partial;  
1753      }      }
1754    
1755      DPRINTF(XVID_DEBUG_RC, "[%i] quant:%i stats1:%i scaled:%i actual:%i overflow:%i\n",                  buffer[pos] = c;
1756          data->frame_num,                  pos++;
1757          data->quant,          } while(1);
         s->length,  
         s->scaled_length,  
         data->length,  
         rc->overflow);  
1758    
1759      return(0);          /* Read \n or EOF */
1760            if (buffer == NULL) {
1761                    /* EOF, so we reached the end of the file, return NULL */
1762                    if(feof(f))
1763                            return(NULL);
1764    
1765                    /* Just an empty line with just a newline, allocate a 1 byte buffer to
1766                     * store a zero length string */
1767                    buffer = (char*)malloc(1);
1768                    if(buffer == NULL)
1769                            return(NULL);
1770  }  }
1771    
1772            /* Zero terminated string */
1773            buffer[pos] = '\0';
1774    
1775            return(buffer);
1776    }
1777    
1778  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
1779     * string */
1780    static char *
1781    skipspaces(char *string)
1782  {  {
1783      switch(opt)          const char spaces[] =
1784      {      {
1785      case XVID_PLG_INFO :                          ' ','\t','\0'
1786          return 0;                  };
1787            const char *spacechar = spaces;
1788    
1789            if (string == NULL) return(NULL);
1790    
1791            while (*string != '\0') {
1792                    /* Test against space chars */
1793                    while (*spacechar != '\0') {
1794                            if (*string == *spacechar) {
1795                                    string++;
1796                                    spacechar = spaces;
1797                                    break;
1798                            }
1799                            spacechar++;
1800                    }
1801    
1802      case XVID_PLG_CREATE :                  /* No space char */
1803          return rc_2pass2_create((xvid_plg_create_t*)param1, param2);                  if (*spacechar == '\0') return(string);
1804            }
1805    
1806      case XVID_PLG_DESTROY :          return(string);
1807          return rc_2pass2_destroy((rc_2pass2_t*)handle, (xvid_plg_destroy_t*)param1);  }
1808    
1809      case XVID_PLG_BEFORE :  /* This function returns a boolean that tells if the string is only a
1810          return rc_2pass2_before((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);   * comment */
1811    static int
1812    iscomment(char *string)
1813    {
1814            const char comments[] =
1815                    {
1816                            '#',';', '%', '\0'
1817                    };
1818            const char *cmtchar = comments;
1819            int iscomment = 0;
1820    
1821            if (string == NULL) return(1);
1822    
1823            string = skipspaces(string);
1824    
1825            while(*cmtchar != '\0') {
1826                    if(*string == *cmtchar) {
1827                            iscomment = 1;
1828                            break;
1829                    }
1830                    cmtchar++;
1831            }
1832    
1833      case XVID_PLG_AFTER :          return(iscomment);
         return rc_2pass2_after((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);  
1834      }      }
1835    
1836      return XVID_ERR_FAIL;  #if 0
1837    static void
1838    stats_print(rc_2pass2_t * rc)
1839    {
1840            int i;
1841            const char frame_type[4] = { 'i', 'p', 'b', 's'};
1842    
1843            for (i=0; i<rc->num_frames; i++) {
1844                    twopass_stat_t *s = &rc->stats[i];
1845                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- frame:%d type:%c quant:%d stats:%d scaled:%d desired:%d actual:%d overflow(%c):%.2f\n",
1846                                    i, frame_type[s->type-1], -1, s->length, s->scaled_length,
1847                                    s->desired_length, -1, frame_type[s->type-1], -1.0f);
1848  }  }
1849    }
1850    #endif
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