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revision 1.1.2.3, Mon May 12 12:33:16 2003 UTC revision 1.4, Fri Jun 11 08:44:30 2004 UTC
# Line 1  Line 1 
1  /******************************************************************************  /******************************************************************************
2   *   *
3   * XviD Bit Rate Controller Library   * XviD Bit Rate Controller Library
4   * - VBR 2 pass bitrate controler implementation -   *  - VBR 2 pass bitrate controller implementation -
5   *   *
6   * Copyright (C) 2002 Edouard Gomez <ed.gomez@wanadoo.fr>   *  Copyright (C)      2002 Foxer <email?>
7     *                     2002 Dirk Knop <dknop@gwdg.de>
8     *                2002-2003 Edouard Gomez <ed.gomez@free.fr>
9     *                     2003 Pete Ross <pross@xvid.org>
10   *   *
11   * The curve treatment algorithm is the one implemented by Foxer <email?> and   *  This curve treatment algorithm is the one originally implemented by Foxer
12   * Dirk Knop <dknop@gwdg.de> for the XviD vfw dynamic library.   *  and tuned by Dirk Knop for the XviD vfw frontend.
13   *   *
14   * This program is free software; you can redistribute it and/or modify   * This program is free software; you can redistribute it and/or modify
15   * it under the terms of the GNU General Public License as published by   * it under the terms of the GNU General Public License as published by
# Line 26  Line 29 
29   *   *
30   *****************************************************************************/   *****************************************************************************/
31    
32    #define BQUANT_PRESCALE
33    #undef COMPENSATE_FORMULA
34    
35    /* forces second pass not to be bigger than first */
36    #undef PASS_SMALLER
37    
38    /* automtically alters overflow controls (strength and improvement/degradation)
39            to fight most common problems without user's knowladge */
40    #define SMART_OVERFLOW_SETTING
41    
42  #include <stdio.h>  #include <stdio.h>
43  #include <math.h>  #include <math.h>
44    #include <limits.h>
 #define RAD2DEG 57.295779513082320876798154814105  
 #define DEG2RAD 0.017453292519943295769236907684886  
45    
46  #include "../xvid.h"  #include "../xvid.h"
47  #include "../image/image.h"  #include "../image/image.h"
48    
49    /*****************************************************************************
50     * Some default settings
51     ****************************************************************************/
52    
53    #define DEFAULT_KEYFRAME_BOOST 0
54    #define DEFAULT_OVERFLOW_CONTROL_STRENGTH 10
55    #define DEFAULT_CURVE_COMPRESSION_HIGH 0
56    #define DEFAULT_CURVE_COMPRESSION_LOW 0
57    #define DEFAULT_MAX_OVERFLOW_IMPROVEMENT 10
58    #define DEFAULT_MAX_OVERFLOW_DEGRADATION 10
59    
60    /* Keyframe settings */
61    #define DEFAULT_KFREDUCTION 20
62    #define DEFAULT_KFTHRESHOLD 1
63    
64    /*****************************************************************************
65     * Some default constants (can be tuned)
66     ****************************************************************************/
67    
68    /* Specify the invariant part of the headers bits (header+MV)
69     * as  hlength/cst */
70    #define INVARIANT_HEADER_PART_IVOP 1 /* factor 1.0f   */
71    #define INVARIANT_HEADER_PART_PVOP 2 /* factor 0.5f   */
72    #define INVARIANT_HEADER_PART_BVOP 8 /* factor 0.125f */
73    
74    /*****************************************************************************
75     * Structures
76     ****************************************************************************/
77    
78    /* Statistics */
79  typedef struct {  typedef struct {
80      int type;               /* first pass type */      int type;               /* first pass type */
81      int quant;              /* first pass quant */      int quant;              /* first pass quant */
82          int blks[3];                    /* k,m,y blks */          int blks[3];                    /* k,m,y blks */
83      int length;             /* first pass length */      int length;             /* first pass length */
84            int invariant;          /* what we assume as being invariant between the two passes, it's a sub part of header + MV bits */
85      int scaled_length;     /* scaled length */      int scaled_length;     /* scaled length */
86      int desired_length;          int desired_length;     /* desired length; calculated during encoding */
87  } stat_t;          int error;
   
88    
89            int zone_mode;   /* XVID_ZONE_xxx */
90            double weight;
91    } 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 bitrate */  
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 */  
   
     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;  
   
     double pquant_error[32];  
     double bquant_error[32];  
     int quant_count[32];  
     int last_quant[3];  
171    
172      double curve_comp_error;          /* Index of the last keyframe used in the keyframe_location */
     int overflow;  
     int KFoverflow;  
     int KFoverflow_partial;  
173      int KF_idx;      int KF_idx;
 } rc_2pass2_t;  
   
174    
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];
196    
197  #define BUF_SZ 1024          /*----------------------------------
198  #define MAX_COLS    5           * Overflow control
199             *--------------------------------*/
200    
201            /* 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;
214    
215            int min_quant; /* internal minimal quant, prevents wrong quants from being used */
216    
217            /*----------------------------------
218             * 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    static  int check_curve_for_vbv_compliancy(rc_2pass2_t * rc, const float fps);
274    static  int scale_curve_for_vbv_compliancy(rc_2pass2_t * rc, const float fps);
275    #if 0
276    static void stats_print(rc_2pass2_t * rc);
277    #endif
278    
279  /* scale the curve */  /*----------------------------------------------------------------------------
280     *--------------------------------------------------------------------------*/
281    
282  static void internal_scale(rc_2pass2_t *rc)  static int
283    rc_2pass2_create(xvid_plg_create_t * create, rc_2pass2_t **handle)
284  {  {
285          int64_t target  = rc->target;          xvid_plugin_2pass2_t * param = (xvid_plugin_2pass2_t *)create->param;
286          int64_t tot_length = rc->tot_length[0] + rc->tot_length[1] + rc->tot_length[2];          rc_2pass2_t * rc;
         int min_size[3];  
         double scaler;  
287          int i;          int i;
288    
289          if (target <= 0 || target >= tot_length) {          rc = malloc(sizeof(rc_2pass2_t));
290                  printf("undersize warning\n");          if (rc == NULL)
291          }                  return XVID_ERR_MEMORY;
292    
293          /* perform an initial scale pass.          /* v1.0.x */
294             if a frame size is scaled underneath our hardcoded minimums, then we force the          rc->param.version = param->version;
295             frame size to the minimum, and deduct the original & scaled frmae length from the          rc->param.bitrate = param->bitrate;
296             original and target total lengths */          rc->param.filename = param->filename;
297            rc->param.keyframe_boost = param->keyframe_boost;
298            rc->param.curve_compression_high = param->curve_compression_high;
299            rc->param.curve_compression_low = param->curve_compression_low;
300            rc->param.overflow_control_strength = param->overflow_control_strength;
301            rc->param.max_overflow_improvement = param->max_overflow_improvement;
302            rc->param.max_overflow_degradation = param->max_overflow_degradation;
303            rc->param.kfreduction = param->kfreduction;
304            rc->param.kfthreshold = param->kfthreshold;
305            rc->param.container_frame_overhead = param->container_frame_overhead;
306    
307            if (XVID_VERSION_MINOR(param->version) >= 1) {
308                    rc->param.vbv_size = param->vbv_size;
309                    rc->param.vbv_initial = param->vbv_initial;
310                    rc->param.vbv_maxrate = param->vbv_maxrate;
311                    rc->param.vbv_peakrate = param->vbv_peakrate;
312            }else{
313                    rc->param.vbv_size =
314                    rc->param.vbv_initial =
315                    rc->param.vbv_maxrate =
316                    rc->param.vbv_peakrate = 0;
317            }
318    
319            /* Initialize all defaults */
320    #define _INIT(a, b) if((a) <= 0) (a) = (b)
321            /* Let's set our defaults if needed */
322            _INIT(rc->param.keyframe_boost, DEFAULT_KEYFRAME_BOOST);
323            _INIT(rc->param.overflow_control_strength, DEFAULT_OVERFLOW_CONTROL_STRENGTH);
324            _INIT(rc->param.curve_compression_high, DEFAULT_CURVE_COMPRESSION_HIGH);
325            _INIT(rc->param.curve_compression_low, DEFAULT_CURVE_COMPRESSION_LOW);
326            _INIT(rc->param.max_overflow_improvement, DEFAULT_MAX_OVERFLOW_IMPROVEMENT);
327            _INIT(rc->param.max_overflow_degradation,  DEFAULT_MAX_OVERFLOW_DEGRADATION);
328    
329            /* Keyframe settings */
330            _INIT(rc->param.kfreduction, DEFAULT_KFREDUCTION);
331            _INIT(rc->param.kfthreshold, DEFAULT_KFTHRESHOLD);
332    #undef _INIT
333    
334          min_size[0] = ((rc->stats[0].blks[0]*22) + 240) / 8;          /* Initialize some stuff to zero */
335          min_size[1] = (rc->stats[0].blks[0] + 88) / 8;          for(i=0; i<3; i++) {
336          min_size[2] = 8;                  int j;
337                    for (j=0; j<32; j++) {
338                            rc->quant_error[i][j] = 0;
339                            rc->quant_count[i][j] = 0;
340                    }
341            }
342    
343            for (i=0; i<3; i++) rc->last_quant[i] = 0;
344    
345          scaler = (double)target / (double)tot_length;          rc->fq_error = 0;
346          //printf("target=%i, tot_length=%i, scaler=%f\n", (int)target, (int)tot_length, scaler);          rc->min_quant = 1;
347    
348          for (i=0; i<rc->num_frames; i++) {          /* Count frames (and intra frames) in the stats file, store the result into
349                  stat_t * s = &rc->stats[i];           * the rc structure */
350                  int len;          if (statsfile_count_frames(rc, param->filename) == -1) {
351                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- ERROR: fopen %s failed\n", param->filename);
352                    free(rc);
353                    return(XVID_ERR_FAIL);
354            }
355    
356                  len = (int)((double)s->length * scaler);          /* Allocate the stats' memory */
357                  if (len < min_size[s->type]) {          /* force frame size */          if ((rc->stats = malloc(rc->num_frames * sizeof(twopass_stat_t))) == NULL) {
358                          s->scaled_length = min_size[s->type];                  free(rc);
359                          target -= s->scaled_length;                  return(XVID_ERR_MEMORY);
                         tot_length -= s->length;  
                 }else{  
                         s->scaled_length = 0;  
360                  }                  }
361    
362            /* Allocate keyframes location's memory
363             * PS: see comment in pre_process0 for the +1 location requirement */
364            rc->keyframe_locations = malloc((rc->num_keyframes + 1) * sizeof(int));
365            if (rc->keyframe_locations == NULL) {
366                    free(rc->stats);
367                    free(rc);
368                    return(XVID_ERR_MEMORY);
369          }          }
370    
371          if (target <= 0 || target >= tot_length) {          /* Load the first pass stats */
372                  printf("undersize warning\n");          if (statsfile_load(rc, param->filename) == -1) {
373                  return;                  DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- ERROR: fopen %s failed\n", param->filename);
374                    free(rc->keyframe_locations);
375                    free(rc->stats);
376                    free(rc);
377                    return XVID_ERR_FAIL;
378          }          }
379    
380          scaler = (double)target / (double)tot_length;          /* Compute the target filesize */
381          //printf("target=%i, tot_length=%i, scaler=%f\n", (int)target, (int)tot_length, scaler);          if (rc->param.bitrate<0) {
382                    /* if negative, bitrate equals the target (in kbytes) */
383                    rc->target = ((uint64_t)(-rc->param.bitrate)) * 1024;
384            } else if (rc->num_frames  < create->fbase/create->fincr) {
385                    /* Source sequence is less than 1s long, we do as if it was 1s long */
386                    rc->target = rc->param.bitrate / 8;
387            } else {
388                    /* Target filesize = bitrate/8 * numframes / framerate */
389                    rc->target =
390                            ((uint64_t)rc->param.bitrate * (uint64_t)rc->num_frames * \
391                             (uint64_t)create->fincr) / \
392                            ((uint64_t)create->fbase * 8);
393            }
394    
395            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Frame rate: %d/%d (%ffps)\n",
396                            create->fbase, create->fincr,
397                            (double)create->fbase/(double)create->fincr);
398            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Number of frames: %d\n", rc->num_frames);
399            if(rc->param.bitrate>=0)
400                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Target bitrate: %ld\n", rc->param.bitrate);
401            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Target filesize: %lld\n", rc->target);
402    
403            /* Compensate the average frame overhead caused by the container */
404            rc->target -= rc->num_frames*rc->param.container_frame_overhead;
405            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Container Frame overhead: %d\n", rc->param.container_frame_overhead);
406            if(rc->param.container_frame_overhead)
407                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- New target filesize after container compensation: %lld\n", rc->target);
408    
409            /* When bitrate is not given it means it has been scaled by an external
410             * application */
411            if (rc->param.bitrate) {
412                    /* Apply zone settings
413                     * - set rc->tot_quant which represents the total num of bytes spent in
414                     *   fixed quant zones
415                     * - set rc->tot_weighted which represents the total amount of bytes
416                     *   spent in normal or weighted zones in first pass (normal zones can
417                     *   be considered weight=1)
418                     * - set rc->tot_quant_invariant which represents the total num of bytes
419                     *   spent in fixed quant zones for headers */
420                    zone_process(rc, create);
421            } else {
422                    /* External scaling -- zones are ignored */
423          for (i=0; i<rc->num_frames; i++) {          for (i=0; i<rc->num_frames; i++) {
424                  stat_t * s = &rc->stats[i];                          rc->stats[i].zone_mode = XVID_ZONE_WEIGHT;
425                            rc->stats[i].weight = 1.0;
426                    }
427                    rc->tot_quant = 0;
428            }
429    
430            /* Gathers some information about first pass stats:
431             *  - finds the minimum frame length for each frame type during 1st pass.
432             *     rc->min_size[]
433             *  - determines the maximum frame length observed (no frame type distinction).
434             *     rc->max_size
435             *  - count how many times each frame type has been used.
436             *     rc->count[]
437             *  - total bytes used per frame type
438             *     rc->tot_length[]
439             *  - total bytes considered invariant between the 2 passes
440             *  - store keyframe location
441             *     rc->keyframe_locations[]
442             */
443            first_pass_stats_prepare_data(rc);
444    
445                  if (s->scaled_length==0) {      /* ignore frame with forced frame sizes */          /* If we have a user bitrate, it means it's an internal curve scaling */
446                          s->scaled_length = (int)((double)s->length * scaler);          if (rc->param.bitrate) {
447                    /* Perform internal curve scaling */
448                    first_pass_scale_curve_internal(rc);
449                  }                  }
450    
451            /* Apply advanced curve options, and compute some parameters in order to
452             * shape the curve in the BEFORE/AFTER pair of functions */
453            scaled_curve_apply_advanced_parameters(rc);
454    
455    /* Check curve for VBV compliancy and rescale if necessary */
456    
457    #ifdef VBV_FORCE
458      if (rc->param.vbv_size==0)
459      {
460        rc->param.vbv_size      =  3145728;
461        rc->param.vbv_initial   =  2359296;
462        rc->param.vbv_maxrate  =  4000000;
463        rc->param.vbv_peakrate = 10000000;
464          }          }
465    #endif
466    
467      if (rc->param.vbv_size>0)    /* vbv_size==0 switches VBV check off */
468      {
469        const double fps = (double)create->fbase/(double)create->fincr;
470        int status = check_curve_for_vbv_compliancy(rc, fps);
471    #ifdef VBV_DEBUG
472        if (status)
473          fprintf(stderr,"underflow detected\n Scaling Curve for compliancy... ");
474    #endif
475    
476            status = scale_curve_for_vbv_compliancy(rc, fps);
477    
478    #ifdef VBV_DEBUG
479          if (status==0)
480            fprintf(stderr,"done.\n");
481          else
482            fprintf(stderr,"impossible.\n");
483    #endif
484      }
485            *handle = rc;
486            return(0);
487  }  }
488    
489    /*----------------------------------------------------------------------------
490     *--------------------------------------------------------------------------*/
491    
492    static int
493    rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy)
494    {
495            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- target_total:%lld desired_total:%.2f (%.2f%%) actual_total:%.2f (%.2f%%)\n",
496                            rc->target,
497                            rc->desired_total,
498                            100*rc->desired_total/(double)rc->target,
499                            rc->real_total,
500                            100*rc->real_total/(double)rc->target);
501    
502            free(rc->keyframe_locations);
503            free(rc->stats);
504            free(rc);
505            return(0);
506    }
507    
508    /*----------------------------------------------------------------------------
509     *--------------------------------------------------------------------------*/
510    
511  /* static void internal_scale(rc_2pass2_t *rc)  static int
512    rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)
513  {  {
514      const double avg_pvop = rc->avg_length[XVID_TYPE_PVOP-1];          twopass_stat_t * s = &rc->stats[data->frame_num];
515      const double avg_bvop = rc->avg_length[XVID_TYPE_BVOP-1];          double dbytes;
516      const uint64_t tot_pvop = rc->tot_length[XVID_TYPE_PVOP-1];          double scaled_quant;
517      const uint64_t tot_bvop = rc->tot_length[XVID_TYPE_BVOP-1];          double overflow;
518      uint64_t i_total = 0;          int capped_to_max_framesize = 0;
         double total1,total2;  
     int i;  
519    
520      for (i=0; i<rc->num_frames; i++) {          /* This function is quite long but easy to understand. In order to simplify
521          stat_t * s = &rc->stats[i];           * the code path (a bit), we treat 3 cases that can return immediatly. */
522    
523                  if (s->type == XVID_TYPE_IVOP) {          /* First case: Another plugin has already set a quantizer */
524                          i_total += s->length + s->length * rc->param.keyframe_boost / 100;          if (data->quant > 0)
525                    return(0);
526    
527            /* Second case: insufficent stats data
528             * We can't guess much what we should do, let core decide all alone */
529            if (data->frame_num >= rc->num_frames) {
530                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- stats file too short (now processing frame %d)",
531                            data->frame_num);
532                    return(0);
533          }          }
534    
535            /* Third case: We are in a Quant zone
536             * Quant zones must just ensure we use the same settings as first pass
537             * So set the quantizer and the type */
538            if (s->zone_mode == XVID_ZONE_QUANT) {
539                    /* Quant stuff */
540                    rc->fq_error += s->weight;
541                    data->quant = (int)rc->fq_error;
542                    rc->fq_error -= data->quant;
543    
544                    /* The type stuff */
545                    data->type = s->type;
546    
547                    /* The only required data for AFTER step is this one for the overflow
548                     * control */
549                    s->desired_length = s->length;
550    
551                    return(0);
552          }          }
553    
         // compensate for avi frame overhead  
         rc->target_size -= rc->num_frames * 24;  
554    
555          // perform prepass to compensate for over/undersizing          /*************************************************************************/
556            /*************************************************************************/
557            /*************************************************************************/
558    
559            /*-------------------------------------------------------------------------
560             * Frame bit allocation first part
561             *
562             * First steps apply user settings, just like it is done in the theoritical
563             * scaled_curve_apply_advanced_parameters
564             *-----------------------------------------------------------------------*/
565    
566            /* Set desired to what we are wanting to obtain for this frame */
567            dbytes = (double)s->scaled_length;
568    
569          if (rc->param.use_alt_curve) {          /* IFrame user settings*/
570            if (s->type == XVID_TYPE_IVOP) {
571                    /* Keyframe boosting -- All keyframes benefit from it */
572                    dbytes += dbytes*rc->param.keyframe_boost / 100;
573    
574          rc->alt_curve_low = avg_pvop - avg_pvop * (double)rc->param.alt_curve_low_dist / 100.0;  #if 0 /* ToDo: decide how to apply kfthresholding */
575                  rc->alt_curve_low_diff = avg_pvop - rc->alt_curve_low;  #endif
                 rc->alt_curve_high = avg_pvop + avg_pvop * (double)rc->param.alt_curve_high_dist / 100.0;  
                 rc->alt_curve_high_diff = rc->alt_curve_high - avg_pvop;  
                 if (rc->alt_curve_use_auto) {  
                         if (rc->movie_curve > 1.0) {  
                                 rc->param.alt_curve_min_rel_qual = (int)(100.0 - (100.0 - 100.0 / rc->movie_curve) * (double)rc->param.alt_curve_auto_str / 100.0);  
                                 if (rc->param.alt_curve_min_rel_qual < 20)  
                                         rc->param.alt_curve_min_rel_qual = 20;  
576              }else{              }else{
577                                  rc->param.alt_curve_min_rel_qual = 100;  
578                    /* P/S/B frames must reserve some bits for iframe boosting */
579                    dbytes *= rc->pb_iboost_tax_ratio;
580    
581                    /* Apply assymetric curve compression */
582                    if (rc->param.curve_compression_high || rc->param.curve_compression_low) {
583                            double assymetric_delta;
584    
585                            /* Compute the assymetric delta, this is computed before applying
586                             * the tax, as done in the pre_process function */
587                            if (dbytes > rc->avg_length[s->type-1])
588                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_high / 100.0;
589                            else
590                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_low  / 100.0;
591    
592                            /* Now we must apply the assymetric tax, else our curve compression
593                             * would not give a theoritical target size equal to what it is
594                             * expected */
595                            dbytes *= rc->assymetric_tax_ratio;
596    
597                            /* Now we can add the assymetric delta */
598                            dbytes += assymetric_delta;
599              }              }
600                  }                  }
                 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;  
601    
602                  if (rc->param.alt_curve_low_dist > 100) {          /* That is what we would like to have -- Don't put that chunk after
603                          switch(rc->param.alt_curve_type) {           * overflow control, otherwise, overflow is counted twice and you obtain
604                          case XVID_CURVE_SINE : // Sine Curve (high aggressiveness)           * half sized bitrate sequences */
605                                  rc->alt_curve_qual_dev *= 2.0 / (1.0 + sin(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff)));          s->desired_length  = (int)dbytes;
606                                  rc->alt_curve_mid_qual = 1.0 - rc->alt_curve_qual_dev * sin(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff));          rc->desired_total += dbytes;
607                                  break;  
608                          case XVID_CURVE_LINEAR : // Linear (medium aggressiveness)          /*------------------------------------------------------------------------
609                                  rc->alt_curve_qual_dev *= 2.0 / (1.0 + avg_pvop / rc->alt_curve_low_diff);           * Frame bit allocation: overflow control part.
610                                  rc->alt_curve_mid_qual = 1.0 - rc->alt_curve_qual_dev * avg_pvop / rc->alt_curve_low_diff;           *
611                                  break;           * Unlike the theoritical scaled_curve_apply_advanced_parameters, here
612                          case XVID_CURVE_COSINE : // Cosine Curve (low aggressiveness)           * it's real encoding and we need to make sure we don't go so far from
613                                  rc->alt_curve_qual_dev *= 2.0 / (1.0 +  (1.0 - cos(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff))));           * what is our ideal scaled curve.
614                                  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)));           *-----------------------------------------------------------------------*/
615    
616            /* Compute the overflow we should compensate */
617            if (s->type != XVID_TYPE_IVOP || rc->overflow > 0) {
618                    double frametype_factor;
619                    double framesize_factor;
620    
621                    /* Take only the desired part of overflow */
622                    overflow = rc->overflow;
623    
624                    /* Factor that will take care to decrease the overflow applied
625                     * according to the importance of this frame type in term of
626                     * overall size */
627                    frametype_factor  = rc->count[XVID_TYPE_IVOP-1]*rc->avg_length[XVID_TYPE_IVOP-1];
628                    frametype_factor += rc->count[XVID_TYPE_PVOP-1]*rc->avg_length[XVID_TYPE_PVOP-1];
629                    frametype_factor += rc->count[XVID_TYPE_BVOP-1]*rc->avg_length[XVID_TYPE_BVOP-1];
630                    frametype_factor /= rc->count[s->type-1]*rc->avg_length[s->type-1];
631                    frametype_factor  = 1/frametype_factor;
632    
633                    /* Factor that will take care not to compensate too much for this frame
634                     * size */
635                    framesize_factor  = dbytes;
636                    framesize_factor /= rc->avg_length[s->type-1];
637    
638                    /* Treat only the overflow part concerned by this frame type and size */
639                    overflow *= frametype_factor;
640    #if 0
641                    /* Leave this one alone, as it impacts badly on quality */
642                    overflow *= framesize_factor;
643    #endif
644    
645                    /* Apply the overflow strength imposed by the user */
646                    overflow *= (rc->param.overflow_control_strength/100.0f);
647            } else {
648                    /* no negative overflow applied in IFrames because:
649                     *  - their role is important as they're references for P/BFrames.
650                     *  - there aren't much in typical sequences, so if an IFrame overflows too
651                     *    much, this overflow may impact the next IFrame too much and generate
652                     *    a sequence of poor quality frames */
653                    overflow = 0;
654                          }                          }
655    
656            /* Make sure we are not trying to compensate more overflow than we even have */
657            if (fabs(overflow) > fabs(rc->overflow))
658                    overflow = rc->overflow;
659    
660            /* Make sure the overflow doesn't make the frame size to get out of the range
661             * [-max_degradation..+max_improvment] */
662            if (overflow > dbytes*rc->param.max_overflow_improvement / 100) {
663                    if(overflow <= dbytes)
664                            dbytes += dbytes * rc->param.max_overflow_improvement / 100;
665                    else
666                            dbytes += overflow * rc->param.max_overflow_improvement / 100;
667            } else if (overflow < - dbytes * rc->param.max_overflow_degradation / 100) {
668                    dbytes -= dbytes * rc->param.max_overflow_degradation / 100;
669            } else {
670                    dbytes += overflow;
671                  }                  }
672    
673            /*-------------------------------------------------------------------------
674             * Frame bit allocation last part:
675             *
676             * Cap frame length so we don't reach neither bigger frame sizes than first
677             * pass nor smaller than the allowed minimum.
678             *-----------------------------------------------------------------------*/
679    
680    #ifdef PASS_SMALLER
681            if (dbytes > s->length) {
682                    dbytes = s->length;
683          }          }
684    #endif
685    
686          total1 = 0;          /* Prevent stupid desired sizes under logical values */
687          total2 = 0;          if (dbytes < rc->min_length[s->type-1]) {
688                    dbytes = rc->min_length[s->type-1];
689            }
690    
691      for (i=0; i<rc->num_frames; i++) {          /*------------------------------------------------------------------------
692          stat_t * s = &rc->stats[i];           * Desired frame length <-> quantizer mapping
693             *-----------------------------------------------------------------------*/
694    
695                  if (s->type != XVID_TYPE_IVOP) {  #ifdef BQUANT_PRESCALE
696            /* For bframes we prescale the quantizer to avoid too high quant scaling */
697            if(s->type == XVID_TYPE_BVOP) {
698    
699              double dbytes = s->length / rc->movie_curve;                  twopass_stat_t *b_ref = s;
             double dbytes2;  
                         total1 += dbytes;  
700    
701                          if (s->type == XVID_TYPE_BVOP)                  /* Find the reference frame */
702                                  dbytes *= avg_pvop / avg_bvop;                  while(b_ref != &rc->stats[0] && b_ref->type == XVID_TYPE_BVOP)
703                            b_ref--;
704    
705                    /* Compute the original quant */
706                    s->quant  = 2*(100*s->quant - data->bquant_offset);
707                    s->quant += data->bquant_ratio - 1; /* to avoid rounding issues */
708                    s->quant  = s->quant/data->bquant_ratio - b_ref->quant;
709            }
710    #endif
711    
712            /* Don't laugh at this very 'simple' quant<->size relationship, it
713             * proves to be acurate enough for our algorithm */
714            scaled_quant = (double)s->quant*(double)s->length/(double)dbytes;
715    
716    #ifdef COMPENSATE_FORMULA
717            /* We know xvidcore will apply the bframe formula again, so we compensate
718             * it right now to make sure we would not apply it twice */
719            if(s->type == XVID_TYPE_BVOP) {
720    
721                          if (rc->param.use_alt_curve) {                  twopass_stat_t *b_ref = s;
722                                  if (dbytes > avg_pvop) {  
723                      if (dbytes >= rc->alt_curve_high) {                  /* Find the reference frame */
724                                                  dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev);                  while(b_ref != &rc->stats[0] && b_ref->type == XVID_TYPE_BVOP)
725                      }else{                          b_ref--;
726                                                  switch(rc->param.alt_curve_type){  
727                                                  case XVID_CURVE_SINE :                  /* Compute the quant it would be if the core did not apply the bframe
728                                                      dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * sin(DEG2RAD * ((dbytes - avg_pvop) * 90.0 / rc->alt_curve_high_diff)));                   * formula */
729                                                          break;                  scaled_quant  = 100*scaled_quant - data->bquant_offset;
730                                                  case XVID_CURVE_LINEAR :                  scaled_quant += data->bquant_ratio - 1; /* to avoid rouding issues */
731                                                      dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - avg_pvop) / rc->alt_curve_high_diff);                  scaled_quant /= data->bquant_ratio;
                                                         break;  
                                                 case XVID_CURVE_COSINE :  
                                                     dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * ((dbytes - avg_pvop) * 90.0 / rc->alt_curve_high_diff))));  
                                                 }  
732                                          }                                          }
733    #endif
734    
735            /* Quantizer has been scaled using floating point operations/results, we
736             * must cast it to integer */
737            data->quant = (int)scaled_quant;
738    
739            /* Let's clip the computed quantizer, if needed */
740            if (data->quant < 1) {
741                    data->quant = 1;
742            } else if (data->quant > 31) {
743                    data->quant = 31;
744                                  }else{                                  }else{
745                      if (dbytes <= rc->alt_curve_low){  
746                                                  dbytes2 = dbytes;                  /* The frame quantizer has not been clipped, this appears to be a good
747                      }else{                   * computed quantizer, do not loose quantizer decimal part that we
748                                                  switch(rc->param.alt_curve_type){                   * accumulate for later reuse when its sum represents a complete
749                                                  case XVID_CURVE_SINE :                   * unit. */
750                                                      dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * sin(DEG2RAD * ((dbytes - avg_pvop) * 90.0 / rc->alt_curve_low_diff)));                  rc->quant_error[s->type-1][data->quant] += scaled_quant - (double)data->quant;
751                                                          break;  
752                                                  case XVID_CURVE_LINEAR :                  if (rc->quant_error[s->type-1][data->quant] >= 1.0) {
753                                                      dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - avg_pvop) / rc->alt_curve_low_diff);                          rc->quant_error[s->type-1][data->quant] -= 1.0;
754                                                          break;                          data->quant++;
755                                                  case XVID_CURVE_COSINE :                  } else if (rc->quant_error[s->type-1][data->quant] <= -1.0) {
756                                                      dbytes2 = dbytes * (rc->alt_curve_mid_qual + rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * ((dbytes - avg_pvop) * 90.0 / rc->alt_curve_low_diff))));                          rc->quant_error[s->type-1][data->quant] += 1.0;
757                            data->quant--;
758                                                  }                                                  }
759                                          }                                          }
760    
761            /* Now we have a computed quant that is in the right quante range, with a
762             * possible +1 correction due to cumulated error. We can now safely clip
763             * the quantizer again with user's quant ranges. "Safely" means the Rate
764             * Control could learn more about this quantizer, this knowledge is useful
765             * for future frames even if it this quantizer won't be really used atm,
766             * that's why we don't perform this clipping earlier. */
767            if (data->quant < data->min_quant[s->type-1]) {
768                    data->quant = data->min_quant[s->type-1];
769            } else if (data->quant > data->max_quant[s->type-1]) {
770                    data->quant = data->max_quant[s->type-1];
771                                  }                                  }
772                          }else{  
773                  if (dbytes > avg_pvop) {          if (data->quant < rc->min_quant) data->quant = rc->min_quant;
774                                          dbytes2 = ((double)dbytes + (avg_pvop - dbytes) *  
775                                                  rc->param.curve_compression_high / 100.0);          /* To avoid big quality jumps from frame to frame, we apply a "security"
776                                  }else{           * rule that makes |last_quant - new_quant| <= 2. This rule only applies
777                                          dbytes2 = ((double)dbytes + (avg_pvop - dbytes) *           * to predicted frames (P and B) */
778                                                  rc->param.curve_compression_low / 100.0);          if (s->type != XVID_TYPE_IVOP && rc->last_quant[s->type-1] && capped_to_max_framesize == 0) {
779    
780                    if (data->quant > rc->last_quant[s->type-1] + 2) {
781                            data->quant = rc->last_quant[s->type-1] + 2;
782                            DPRINTF(XVID_DEBUG_RC,
783                                            "[xvid rc] -- frame %d p/b-frame quantizer prevented from rising too steeply\n",
784                                            data->frame_num);
785                    }
786                    if (data->quant < rc->last_quant[s->type-1] - 2) {
787                            data->quant = rc->last_quant[s->type-1] - 2;
788                            DPRINTF(XVID_DEBUG_RC,
789                                            "[xvid rc] -- frame:%d p/b-frame quantizer prevented from falling too steeply\n",
790                                            data->frame_num);
791                                  }                                  }
792                          }                          }
793    
794                          if (s->type == XVID_TYPE_BVOP) {          /* We don't want to pollute the RC histerisis when our computed quant has
795                                  dbytes2 *= avg_bvop / avg_pvop;           * been computed from a capped frame size */
796              }          if (capped_to_max_framesize == 0)
797                    rc->last_quant[s->type-1] = data->quant;
798    
799              if (dbytes2 < rc->min_length[s->type-1]) {          /* Don't forget to force 1st pass frame type ;-) */
800                  dbytes = rc->min_length[s->type-1];          data->type = s->type;
801    
802            return 0;
803              }              }
804    
805              total2 += dbytes2;  /*----------------------------------------------------------------------------
806     *--------------------------------------------------------------------------*/
807    
808    static int
809    rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)
810    {
811            const char frame_type[4] = { 'i', 'p', 'b', 's'};
812            twopass_stat_t * s = &rc->stats[data->frame_num];
813    
814            /* Insufficent stats data */
815            if (data->frame_num >= rc->num_frames)
816                    return 0;
817    
818            /* Update the quantizer counter */
819            rc->quant_count[s->type-1][data->quant]++;
820    
821            /* Update the frame type overflow */
822            if (data->type == XVID_TYPE_IVOP) {
823                    int kfdiff = 0;
824    
825                    if(rc->KF_idx != rc->num_frames -1) {
826                            kfdiff  = rc->keyframe_locations[rc->KF_idx+1];
827                            kfdiff -= rc->keyframe_locations[rc->KF_idx];
828                  }                  }
829    
830                    /* Flush Keyframe overflow accumulator */
831                    rc->overflow += rc->KFoverflow;
832    
833                    /* Store the frame overflow to the keyframe accumulator */
834                    rc->KFoverflow = s->desired_length - data->length;
835    
836                    if (kfdiff > 1) {
837                            /* Non-consecutive keyframes case:
838                             * We can then divide this total keyframe overflow into equal parts
839                             * that we will distribute into regular overflow at each frame
840                             * between the sequence bounded by two IFrames */
841                            rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);
842                    } else {
843                            /* Consecutive keyframes case:
844                             * Flush immediatly the keyframe overflow and reset keyframe
845                             * overflow */
846                            rc->overflow += rc->KFoverflow;
847                            rc->KFoverflow = 0;
848                            rc->KFoverflow_partial = 0;
849          }          }
850                    rc->KF_idx++;
851            } else {
852                    /* Accumulate the frame overflow */
853                    rc->overflow += s->desired_length - data->length;
854    
855          rc->curve_comp_scale = total1 / total2;                  /* Distribute part of the keyframe overflow */
856                    rc->overflow += rc->KFoverflow_partial;
857    
858          if (!rc->param.use_alt_curve) {                  /* Don't forget to substract that same amount from the total keyframe
859                  printf("middle frame size for asymmetric curve compression: %i",                   * overflow */
860              (int)(avg_pvop * rc->curve_comp_scale));                  rc->KFoverflow -= rc->KFoverflow_partial;
861          }          }
 }*/  
862    
863            rc->overflow += (s->error = s->desired_length - data->length);
864            rc->real_total += data->length;
865    
866            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- frame:%d type:%c quant:%d stats:%d scaled:%d desired:%d actual:%d error:%d overflow:%.2f\n",
867                            data->frame_num,
868                            frame_type[data->type-1],
869                            data->quant,
870                            s->length,
871                            s->scaled_length,
872                            s->desired_length,
873                            s->desired_length - s->error,
874                            -s->error,
875                            rc->overflow);
876    
877            return(0);
878    }
879    
880    /*****************************************************************************
881     * Helper functions definition
882     ****************************************************************************/
883    
884  /* open stats file(s) and read into rc->stats array */  /* Default buffer size for reading lines */
885    #define BUF_SZ   1024
886    
887  static int load_stats(rc_2pass2_t *rc, char * filename)  /* Helper functions for reading/parsing the stats file */
888    static char *skipspaces(char *string);
889    static int iscomment(char *string);
890    static char *readline(FILE *f);
891    
892    /* This function counts the number of frame entries in the stats file
893     * It also counts the number of I Frames */
894    static int
895    statsfile_count_frames(rc_2pass2_t * rc, char * filename)
896  {  {
897      FILE * f;      FILE * f;
898      int i, not_scaled;          char *line;
899            int lines;
900    
901            rc->num_frames = 0;
902            rc->num_keyframes = 0;
903    
904            if ((f = fopen(filename, "rb")) == NULL)
905                    return(-1);
906    
907      if ((f = fopen(filename, "rt"))==NULL)          lines = 0;
908          return 0;          while ((line = readline(f)) != NULL) {
909    
910      i = 0;                  char *ptr;
         not_scaled = 0;  
     while(i < rc->num_frames) {  
         stat_t * s = &rc->stats[i];  
         int n;  
911          char type;          char type;
912                    int fields;
913    
914                  s->scaled_length = 0;                  lines++;
         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);  
         if (n == EOF) break;  
                 if (n < 7) {  
                         not_scaled = 1;  
                 }  
915    
916          if (type == 'i') {                  /* We skip spaces */
917              s->type = XVID_TYPE_IVOP;                  ptr = skipspaces(line);
918          }else if (type == 'p' || type == 's') {  
919              s->type = XVID_TYPE_PVOP;                  /* Skip coment lines or empty lines */
920          }else if (type == 'b') {                  if(iscomment(ptr) || *ptr == '\0') {
921              s->type = XVID_TYPE_BVOP;                          free(line);
         }else{  /* unknown type */  
             printf("unk\n");  
922              continue;              continue;
923          }          }
924    
925          i++;                  /* Read the stat line from buffer */
926                    fields = sscanf(ptr, "%c", &type);
927    
928                    /* Valid stats files have at least 7 fields */
929                    if (fields == 1) {
930                            switch(type) {
931                            case 'i':
932                            case 'I':
933                                    rc->num_keyframes++;
934                            case 'p':
935                            case 'P':
936                            case 'b':
937                            case 'B':
938                            case 's':
939                            case 'S':
940                                    rc->num_frames++;
941                                    break;
942                            default:
943                                    DPRINTF(XVID_DEBUG_RC,
944                                                    "[xvid rc] -- WARNING: L%d unknown frame type used (%c).\n",
945                                                    lines, type);
946                            }
947                    } else {
948                                    DPRINTF(XVID_DEBUG_RC,
949                                                    "[xvid rc] -- WARNING: L%d misses some stat fields (%d).\n",
950                                                    lines, 7-fields);
951                    }
952    
953                    /* Free the line buffer */
954                    free(line);
955      }      }
     rc->num_frames = i;  
956    
957            /* We are done with the file */
958      fclose(f);      fclose(f);
959    
960      return 1;          return(0);
961  }  }
962    
963    /* open stats file(s) and read into rc->stats array */
964    static int
965    statsfile_load(rc_2pass2_t *rc, char * filename)
966    {
967            FILE * f;
968            int processed_entries;
969    
970            /* Opens the file */
971            if ((f = fopen(filename, "rb"))==NULL)
972                    return(-1);
973    
974            processed_entries = 0;
975            while(processed_entries < rc->num_frames) {
976                    char type;
977                    int fields;
978                    twopass_stat_t * s = &rc->stats[processed_entries];
979                    char *line, *ptr;
980    
981                    /* Read the line from the file */
982                    if((line = readline(f)) == NULL)
983                            break;
984    
985  static void print_stats(rc_2pass2_t * rc)                  /* We skip spaces */
986  {                  ptr = skipspaces(line);
987      int i;  
988      for (i = 0; i < rc->num_frames; i++) {                  /* Skip comment lines or empty lines */
989          stat_t * s = &rc->stats[i];                  if(iscomment(ptr) || *ptr == '\0') {
990          printf("%i %i %i %i\n", s->type, s->quant, s->length, s->scaled_length);                          free(line);
991                            continue;
992                    }
993    
994                    /* Reset this field that is optional */
995                    s->scaled_length = 0;
996    
997                    /* Convert the fields */
998                    fields = sscanf(ptr,
999                                                    "%c %d %d %d %d %d %d %d\n",
1000                                                    &type,
1001                                                    &s->quant,
1002                                                    &s->blks[0], &s->blks[1], &s->blks[2],
1003                                                    &s->length, &s->invariant /* not really yet */,
1004                                                    &s->scaled_length);
1005    
1006                    /* Free line buffer, we don't need it anymore */
1007                    free(line);
1008    
1009                    /* Fail silently, this has probably been warned in
1010                     * statsfile_count_frames */
1011                    if(fields != 7 && fields != 8)
1012                            continue;
1013    
1014                    /* Convert frame type and compute the invariant length part */
1015                    switch(type) {
1016                    case 'i':
1017                    case 'I':
1018                            s->type = XVID_TYPE_IVOP;
1019                            s->invariant /= INVARIANT_HEADER_PART_IVOP;
1020                            break;
1021                    case 'p':
1022                    case 'P':
1023                    case 's':
1024                    case 'S':
1025                            s->type = XVID_TYPE_PVOP;
1026                            s->invariant /= INVARIANT_HEADER_PART_PVOP;
1027                            break;
1028                    case 'b':
1029                    case 'B':
1030                            s->type = XVID_TYPE_BVOP;
1031                            s->invariant /= INVARIANT_HEADER_PART_BVOP;
1032                            break;
1033                    default:
1034                            /* Same as before, fail silently */
1035                            continue;
1036      }      }
1037    
1038                    /* Ok it seems it's been processed correctly */
1039                    processed_entries++;
1040  }  }
1041    
1042            /* Close the file */
1043            fclose(f);
1044    
1045  /* pre-process the statistics data          return(0);
1046      this is a clone of vfw/src/2pass.c:codec_2pass_init minus file reading, alt_curve, internal scale  }
 */  
1047    
1048  void pre_process0(rc_2pass2_t * rc)  /* pre-process the statistics data
1049     * - for each type, count, tot_length, min_length, max_length
1050     * - set keyframes_locations, tot_prescaled */
1051    static void
1052    first_pass_stats_prepare_data(rc_2pass2_t * rc)
1053  {  {
1054      int i,j;      int i,j;
1055    
1056            /* *rc fields initialization
1057             * NB: INT_MAX and INT_MIN are used in order to be immediately replaced
1058             *     with real values of the 1pass */
1059      for (i=0; i<3; i++) {      for (i=0; i<3; i++) {
1060          rc->count[i]=0;          rc->count[i]=0;
1061          rc->tot_length[i] = 0;          rc->tot_length[i] = 0;
1062          rc->last_quant[i] = 0;                  rc->tot_invariant[i] = 0;
1063                    rc->min_length[i] = INT_MAX;
1064      }      }
1065    
1066      for (i=0; i<32;i++) {          rc->max_length = INT_MIN;
1067          rc->pquant_error[i] = 0;          rc->tot_weighted = 0;
         rc->bquant_error[i] = 0;  
         rc->quant_count[i] = 0;  
     }  
1068    
1069            /* Loop through all frames and find/compute all the stuff this function
1070             * is supposed to do */
1071      for (i=j=0; i<rc->num_frames; i++) {      for (i=j=0; i<rc->num_frames; i++) {
1072          stat_t * s = &rc->stats[i];                  twopass_stat_t * s = &rc->stats[i];
1073    
1074          rc->count[s->type-1]++;          rc->count[s->type-1]++;
1075          rc->tot_length[s->type-1] += s->length;          rc->tot_length[s->type-1] += s->length;
1076                    rc->tot_invariant[s->type-1] += s->invariant;
1077                    if (s->zone_mode != XVID_ZONE_QUANT)
1078                            rc->tot_weighted += (int)(s->weight*(s->length - s->invariant));
1079    
1080          if (i == 0 || s->length < rc->min_length[s->type-1]) {                  if (s->length < rc->min_length[s->type-1]) {
1081              rc->min_length[s->type-1] = s->length;              rc->min_length[s->type-1] = s->length;
1082          }          }
1083    
1084          if (i == 0 || s->length > rc->max_length) {                  if (s->length > rc->max_length) {
1085              rc->max_length = s->length;              rc->max_length = s->length;
1086          }          }
1087    
# Line 427  Line 1090 
1090              j++;              j++;
1091          }          }
1092      }      }
     rc->keyframe_locations[j] = i;  
 }  
1093    
1094            /* NB:
1095             * The "per sequence" overflow system considers a natural sequence to be
1096             * formed by all frames between two iframes, so if we want to make sure
1097             * the system does not go nuts during last sequence, we force the last
1098             * frame to appear in the keyframe locations array. */
1099            rc->keyframe_locations[j] = i;
1100    
1101            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Min 1st pass IFrame length: %d\n", rc->min_length[0]);
1102            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Min 1st pass PFrame length: %d\n", rc->min_length[1]);
1103            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Min 1st pass BFrame length: %d\n", rc->min_length[2]);
1104    }
1105    
1106  void pre_process1(rc_2pass2_t * rc)  /* calculate zone weight "center" */
1107    static void
1108    zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)
1109  {  {
1110      int i;          int i,j;
1111      double total1, total2;          int n = 0;
     uint64_t ivop_boost_total;  
1112    
1113      ivop_boost_total = 0;          rc->tot_quant = 0;
1114      rc->curve_comp_error = 0;          rc->tot_quant_invariant = 0;
1115    
1116      for (i=0; i<3; i++) {          if (create->num_zones == 0) {
1117          rc->tot_scaled_length[i] = 0;                  for (j = 0; j < rc->num_frames; j++) {
1118                            rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1119                            rc->stats[j].weight = 1.0;
1120                    }
1121                    n += rc->num_frames;
1122      }      }
1123    
     for (i=0; i<rc->num_frames; i++) {  
         stat_t * s = &rc->stats[i];  
1124    
1125          rc->tot_scaled_length[s->type-1] += s->scaled_length;          for(i=0; i < create->num_zones; i++) {
1126    
1127          if (s->type == XVID_TYPE_IVOP) {                  int next = (i+1<create->num_zones) ? create->zones[i+1].frame : rc->num_frames;
             ivop_boost_total += s->scaled_length * rc->param.keyframe_boost / 100;  
         }  
     }  
1128    
1129      rc->movie_curve = ((double)(rc->tot_scaled_length[XVID_TYPE_PVOP-1] + rc->tot_scaled_length[XVID_TYPE_BVOP-1] + ivop_boost_total) /                  /* Zero weight make no sense */
1130                                          (rc->tot_scaled_length[XVID_TYPE_PVOP-1] + rc->tot_scaled_length[XVID_TYPE_BVOP-1]));                  if (create->zones[i].increment == 0) create->zones[i].increment = 1;
1131                    /* And obviously an undetermined infinite makes even less sense */
1132                    if (create->zones[i].base == 0) create->zones[i].base = 1;
1133    
1134      for(i=0; i<3; i++) {                  if (i==0 && create->zones[i].frame > 0) {
1135          if (rc->count[i] == 0 || rc->movie_curve == 0) {                          for (j = 0; j < create->zones[i].frame && j < rc->num_frames; j++) {
1136              rc->avg_length[i] = 1;                                  rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1137          }else{                                  rc->stats[j].weight = 1.0;
             rc->avg_length[i] = rc->tot_scaled_length[i] / rc->count[i] / rc->movie_curve;  
1138          }          }
1139                            n += create->zones[i].frame;
1140      }      }
1141    
1142      /* alt curve stuff here */                  if (create->zones[i].mode == XVID_ZONE_WEIGHT) {
1143                            for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {
1144      if (rc->param.use_alt_curve) {                                  rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1145          const double avg_pvop = rc->avg_length[XVID_TYPE_PVOP-1];                                  rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;
         const uint64_t tot_pvop = rc->tot_length[XVID_TYPE_PVOP-1];  
         const uint64_t tot_bvop = rc->tot_length[XVID_TYPE_BVOP-1];  
         const uint64_t tot_scaled_pvop = rc->tot_scaled_length[XVID_TYPE_PVOP-1];  
         const uint64_t tot_scaled_bvop = rc->tot_scaled_length[XVID_TYPE_BVOP-1];  
   
                 rc->alt_curve_low = avg_pvop - avg_pvop * (double)rc->param.alt_curve_low_dist / 100.0;  
                 rc->alt_curve_low_diff = avg_pvop - rc->alt_curve_low;  
                 rc->alt_curve_high = avg_pvop + avg_pvop * (double)rc->param.alt_curve_high_dist / 100.0;  
                 rc->alt_curve_high_diff = rc->alt_curve_high - avg_pvop;  
   
         if (rc->param.alt_curve_use_auto) {  
             if (tot_bvop + tot_pvop > tot_scaled_bvop + tot_scaled_pvop) {  
                                 rc->param.alt_curve_min_rel_qual = (int)(100.0 - (100.0 - 100.0 /  
                                         ((double)(tot_pvop + tot_bvop) / (double)(tot_scaled_pvop + tot_scaled_bvop))) * (double)rc->param.alt_curve_auto_str / 100.0);  
   
                                 if (rc->param.alt_curve_min_rel_qual < 20)  
                                         rc->param.alt_curve_min_rel_qual = 20;  
             }else{  
                                 rc->param.alt_curve_min_rel_qual = 100;  
1146              }              }
1147                            next -= create->zones[i].frame;
1148                            n += next;
1149                    } else{  /* XVID_ZONE_QUANT */
1150                            for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {
1151                                    rc->stats[j].zone_mode = XVID_ZONE_QUANT;
1152                                    rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;
1153                                    rc->tot_quant += rc->stats[j].length;
1154                                    rc->tot_quant_invariant += rc->stats[j].invariant;
1155          }          }
                 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;  
   
         if (rc->param.alt_curve_low_dist > 100) {  
                         switch(rc->param.alt_curve_type) {  
             case XVID_CURVE_SINE: // Sine Curve (high aggressiveness)  
                                 rc->alt_curve_qual_dev *= 2.0 / (1.0 + sin(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff)));  
                                 rc->alt_curve_mid_qual = 1.0 - rc->alt_curve_qual_dev * sin(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff));  
                                 break;  
                         case XVID_CURVE_LINEAR: // Linear (medium aggressiveness)  
                                 rc->alt_curve_qual_dev *= 2.0 / (1.0 + avg_pvop / rc->alt_curve_low_diff);  
                                 rc->alt_curve_mid_qual = 1.0 - rc->alt_curve_qual_dev * avg_pvop / rc->alt_curve_low_diff;  
                                 break;  
                         case XVID_CURVE_COSINE: // Cosine Curve (low aggressiveness)  
                                 rc->alt_curve_qual_dev *= 2.0 / (1.0 + (1.0 - cos(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff))));  
                                 rc->alt_curve_mid_qual = 1.0 - rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff)));  
1156                          }                          }
1157                  }                  }
1158      }      }
     /* --- */  
1159    
1160    
1161      total1=total2=0;  /* scale the curve */
1162      for (i=0; i<rc->num_frames; i++) {  static void
1163          stat_t * s = &rc->stats[i];  first_pass_scale_curve_internal(rc_2pass2_t *rc)
1164    {
1165            int64_t target;
1166            int64_t total_invariant;
1167            double scaler;
1168            int i, num_MBs;
1169    
1170          if (s->type != XVID_TYPE_IVOP) {          /* We only scale texture data ! */
1171              double dbytes,dbytes2;          total_invariant  = rc->tot_invariant[XVID_TYPE_IVOP-1];
1172            total_invariant += rc->tot_invariant[XVID_TYPE_PVOP-1];
1173            total_invariant += rc->tot_invariant[XVID_TYPE_BVOP-1];
1174            /* don't forget to substract header bytes used in quant zones, otherwise we
1175             * counting them twice */
1176            total_invariant -= rc->tot_quant_invariant;
1177    
1178            /* We remove the bytes used by the fixed quantizer zones during first pass
1179             * with the same quants, so we know very precisely how much that
1180             * represents */
1181            target  = rc->target;
1182            target -= rc->tot_quant;
1183    
1184            /* Let's compute a linear scaler in order to perform curve scaling */
1185            scaler = (double)(target - total_invariant) / (double)(rc->tot_weighted);
1186    
1187    #ifdef SMART_OVERFLOW_SETTING
1188            if (scaler > 0.9) {
1189                    rc->param.max_overflow_degradation *= 5;
1190                    rc->param.max_overflow_improvement *= 5;
1191                    rc->param.overflow_control_strength *= 3;
1192            } else if (scaler > 0.6) {
1193                    rc->param.max_overflow_degradation *= 2;
1194                    rc->param.max_overflow_improvement *= 2;
1195                    rc->param.overflow_control_strength *= 2;
1196            } else {
1197                    rc->min_quant = 2;
1198            }
1199    #endif
1200    
1201            /* Compute min frame lengths (for each frame type) according to the number
1202             * of MBs. We sum all block type counters of frame 0, this gives us the
1203             * number of MBs.
1204             *
1205             * We compare these hardcoded values with observed values in first pass
1206             * (determined in pre_process0).Then we keep the real minimum. */
1207    
1208              dbytes = s->scaled_length / rc->movie_curve;          /* Number of MBs */
1209              dbytes2 = 0; /* XXX: warning */          num_MBs  = rc->stats[0].blks[0];
1210              total1 += dbytes;          num_MBs += rc->stats[0].blks[1];
1211              if (s->type == XVID_TYPE_BVOP)          num_MBs += rc->stats[0].blks[2];
1212                  dbytes *= rc->avg_length[XVID_TYPE_PVOP-1] / rc->avg_length[XVID_TYPE_BVOP-1];  
1213            /* Minimum for I frames */
1214            if(rc->min_length[XVID_TYPE_IVOP-1] > ((num_MBs*22) + 240) / 8)
1215                    rc->min_length[XVID_TYPE_IVOP-1] = ((num_MBs*22) + 240) / 8;
1216    
1217            /* Minimum for P/S frames */
1218            if(rc->min_length[XVID_TYPE_PVOP-1] > ((num_MBs) + 88)  / 8)
1219                    rc->min_length[XVID_TYPE_PVOP-1] = ((num_MBs) + 88)  / 8;
1220    
1221            /* Minimum for B frames */
1222            if(rc->min_length[XVID_TYPE_BVOP-1] > 8)
1223                    rc->min_length[XVID_TYPE_BVOP-1] = 8;
1224    
1225              if (rc->param.use_alt_curve) {          /* Perform an initial scale pass.
1226                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {           *
1227             * If a frame size is scaled underneath our hardcoded minimums, then we
1228             * force the frame size to the minimum, and deduct the original & scaled
1229             * frame length from the original and target total lengths */
1230            for (i=0; i<rc->num_frames; i++) {
1231                    twopass_stat_t * s = &rc->stats[i];
1232                    int len;
1233    
1234                      if (dbytes >= rc->alt_curve_high) {                  /* No need to scale frame length for which a specific quantizer is
1235                                                  dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev);                   * specified thanks to zones */
1236                      }else{                  if (s->zone_mode == XVID_ZONE_QUANT) {
1237                                                  switch(rc->param.alt_curve_type) {                          s->scaled_length = s->length;
1238                          case XVID_CURVE_SINE :                          continue;
                                                     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))));  
                                                 }  
1239                                          }                                          }
1240    
1241                    /* Compute the scaled length -- only non invariant data length is scaled */
1242                    len = s->invariant + (int)((double)(s->length-s->invariant) * scaler * s->weight);
1243    
1244                    /* Compare with the computed minimum */
1245                    if (len < rc->min_length[s->type-1]) {
1246                            /* This is a 'forced size' frame, set its frame size to the
1247                             * computed minimum */
1248                            s->scaled_length = rc->min_length[s->type-1];
1249    
1250                            /* Remove both scaled and original size from their respective
1251                             * total counters, as we prepare a second pass for 'regular'
1252                             * frames */
1253                            target -= s->scaled_length;
1254                  }else{                  }else{
1255                      if (dbytes <= rc->alt_curve_low) {                          /* Do nothing for now, we'll scale this later */
1256                                                  dbytes2 = dbytes;                          s->scaled_length = 0;
                     }else{  
                                                 switch(rc->param.alt_curve_type) {  
                                                 case XVID_CURVE_SINE :  
                                                     dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * sin(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_low_diff)));  
                                                         break;  
                                                 case XVID_CURVE_LINEAR :  
                                                     dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) / rc->alt_curve_low_diff);  
                                                         break;  
                                                 case XVID_CURVE_COSINE :  
                                                     dbytes2 = dbytes * (rc->alt_curve_mid_qual + rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_low_diff))));  
1257                                                  }                                                  }
1258                                          }                                          }
1259    
1260                  }          /* The first pass on data substracted all 'forced size' frames from the
1261             * total counters. Now, it's possible to scale the 'regular' frames. */
1262    
1263            /* Scaling factor for 'regular' frames */
1264            scaler = (double)(target - total_invariant) / (double)(rc->tot_weighted);
1265    
1266              }else{          /* Do another pass with the new scaler */
1267                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {          for (i=0; i<rc->num_frames; i++) {
1268                      dbytes2=((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_high / 100.0);                  twopass_stat_t * s = &rc->stats[i];
                 }else{  
                                 dbytes2 = ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_low / 100.0);  
                 }  
             }  
1269    
1270              if (s->type == XVID_TYPE_BVOP) {                  /* Ignore frame with forced frame sizes */
1271                              dbytes2 *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];                  if (s->scaled_length == 0)
1272                              if (dbytes2 < rc->min_length[XVID_TYPE_BVOP-1])                          s->scaled_length = s->invariant + (int)((double)(s->length-s->invariant) * scaler * s->weight);
                                     dbytes2 = rc->min_length[XVID_TYPE_BVOP-1];  
             }else{  
                             if (dbytes2 < rc->min_length[XVID_TYPE_PVOP-1])  
                                     dbytes2 = rc->min_length[XVID_TYPE_PVOP-1];  
1273              }              }
             total2 += dbytes2;  
         }  
     }  
   
     rc->curve_comp_scale = total1 / total2;  
1274    
1275      if (!rc->param.use_alt_curve) {          /* Job done */
1276          printf("middle frame size for asymmetric curve compression: %i\n",          return;
             (int)(rc->avg_length[XVID_TYPE_PVOP-1] * rc->curve_comp_scale));  
1277      }      }
1278    
1279      if (rc->param.use_alt_curve) {  /* Apply all user settings to the scaled curve
1280          int bonus_bias = rc->param.alt_curve_bonus_bias;   * This implies:
1281          int oldquant = 1;   *   keyframe boosting
1282     *   high/low compression */
1283    static void
1284    scaled_curve_apply_advanced_parameters(rc_2pass2_t * rc)
1285    {
1286            int i;
1287            int64_t ivop_boost_total;
1288    
1289              if (rc->param.alt_curve_use_auto_bonus_bias)          /* Reset the rate controller (per frame type) total byte counters */
1290                      bonus_bias = rc->param.alt_curve_min_rel_qual;          for (i=0; i<3; i++) rc->tot_scaled_length[i] = 0;
1291    
1292              rc->alt_curve_curve_bias_bonus = (total1 - total2) * (double)bonus_bias / 100.0 / (double)(rc->num_frames /* - credits_frames */ - rc->num_keyframes);          /* Compute total bytes for each frame type */
1293              rc->curve_comp_scale = ((total1 - total2) * (1.0 - (double)bonus_bias / 100.0) + total2) / total2;          for (i=0; i<rc->num_frames;i++) {
1294                    twopass_stat_t *s = &rc->stats[i];
1295                    rc->tot_scaled_length[s->type-1] += s->scaled_length;
1296            }
1297    
1298            /* First we compute the total amount of bits needed, as being described by
1299             * the scaled distribution. During this pass over the complete stats data,
1300             * we see how much bits two user settings will get/give from/to p&b frames:
1301             *  - keyframe boosting
1302             *  - keyframe distance penalty */
1303            rc->KF_idx = 0;
1304            ivop_boost_total = 0;
1305            for (i=0; i<rc->num_frames; i++) {
1306                    twopass_stat_t * s = &rc->stats[i];
1307    
1308          /* special info for alt curve:  bias bonus and quantizer thresholds */                  /* Some more work is needed for I frames */
1309                    if (s->type == XVID_TYPE_IVOP) {
1310                            int ivop_boost;
1311    
1312                  printf("avg scaled framesize:%i", (int)rc->avg_length[XVID_TYPE_PVOP-1]);                          /* Accumulate bytes needed for keyframe boosting */
1313                  printf("bias bonus:%i bytes", (int)rc->alt_curve_curve_bias_bonus);                          ivop_boost = s->scaled_length*rc->param.keyframe_boost/100;
1314    
1315                  for (i=1; i <= (int)(rc->alt_curve_high*2)+1; i++) {  #if 0 /* ToDo: decide how to apply kfthresholding */
1316              double curve_temp, dbytes;  #endif
1317              int newquant;                          /* If the frame size drops under the minimum length, then cap ivop_boost */
1318                            if (ivop_boost + s->scaled_length < rc->min_length[XVID_TYPE_IVOP-1])
1319                                    ivop_boost = rc->min_length[XVID_TYPE_IVOP-1] - s->scaled_length;
1320    
1321              dbytes = i;                          /* Accumulate the ivop boost */
1322                          if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                          ivop_boost_total += ivop_boost;
1323                  if (dbytes >= rc->alt_curve_high) {  
1324                                          curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev);                          /* Don't forget to update the keyframe index */
1325                  }else{                          rc->KF_idx++;
                                         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))));  
                                         }  
1326                                  }                                  }
1327                          }                          }
1328    
1329                          if (rc->movie_curve > 1.0)          /* Initialize the IBoost tax ratio for P/S/B frames
1330                                  dbytes *= rc->movie_curve;           *
1331             * This ratio has to be applied to p/b/s frames in order to reserve
1332             * additional bits for keyframes (keyframe boosting) or if too much
1333             * keyframe distance is applied, bits retrieved from the keyframes.
1334             *
1335             * ie pb_length *= rc->pb_iboost_tax_ratio;
1336             *
1337             *    gives the ideal length of a p/b frame */
1338    
1339                          newquant = (int)(dbytes * 2.0 / (curve_temp * rc->curve_comp_scale + rc->alt_curve_curve_bias_bonus));          /* Compute the total length of p/b/s frames (temporary storage into
1340                          if (newquant > 1) {           * movie_curve) */
1341                                  if (newquant != oldquant) {          rc->pb_iboost_tax_ratio  = (double)rc->tot_scaled_length[XVID_TYPE_PVOP-1];
1342                      int percent = (int)((i - rc->avg_length[XVID_TYPE_PVOP-1]) * 100.0 / rc->avg_length[XVID_TYPE_PVOP-1]);          rc->pb_iboost_tax_ratio += (double)rc->tot_scaled_length[XVID_TYPE_BVOP-1];
1343                                          oldquant = newquant;  
1344                                          printf("quant:%i threshold at %i : %i percent", newquant, i, percent);          /* Compute the ratio described above
1345                                  }           *     taxed_total = sum(0, n, tax*scaled_length)
1346                          }           * <=> taxed_total = tax.sum(0, n, scaled_length)
1347                  }           * <=> tax = taxed_total / original_total */
1348            rc->pb_iboost_tax_ratio =
1349                    (rc->pb_iboost_tax_ratio - ivop_boost_total) /
1350                    rc->pb_iboost_tax_ratio;
1351    
1352            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- IFrame boost tax ratio:%.2f\n",
1353                            rc->pb_iboost_tax_ratio);
1354    
1355            /* Compute the average size of frames per frame type */
1356            for(i=0; i<3; i++) {
1357                    /* Special case for missing type or weird case */
1358                    if (rc->count[i] == 0 || rc->pb_iboost_tax_ratio == 0) {
1359                            rc->avg_length[i] = 1;
1360                    } else {
1361                            rc->avg_length[i] = rc->tot_scaled_length[i];
1362    
1363                            if (i == (XVID_TYPE_IVOP-1)) {
1364                                    /* I Frames total has to be added the boost total */
1365                                    rc->avg_length[i] += ivop_boost_total;
1366                            } else {
1367                                    /* P/B frames has to taxed */
1368                                    rc->avg_length[i] *= rc->pb_iboost_tax_ratio;
1369      }      }
1370    
1371      rc->overflow = 0;                          /* Finally compute the average frame size */
1372      rc->KFoverflow = 0;                          rc->avg_length[i] /= (double)rc->count[i];
1373      rc->KFoverflow_partial = 0;                  }
     rc->KF_idx = 1;  
1374  }  }
1375    
1376            /* Assymetric curve compression */
1377            if (rc->param.curve_compression_high || rc->param.curve_compression_low) {
1378                    double symetric_total;
1379                    double assymetric_delta_total;
1380    
1381                    /* Like I frame boosting, assymetric curve compression modifies the total
1382                     * amount of needed bits, we must compute the ratio so we can prescale
1383                     lengths */
1384                    symetric_total = 0;
1385                    assymetric_delta_total = 0;
1386                    for (i=0; i<rc->num_frames; i++) {
1387                            double assymetric_delta;
1388                            double dbytes;
1389                            twopass_stat_t * s = &rc->stats[i];
1390    
1391                            /* I Frames are not concerned by assymetric scaling */
1392                            if (s->type == XVID_TYPE_IVOP)
1393                                    continue;
1394    
1395  static int rc_2pass2_create(xvid_plg_create_t * create, rc_2pass2_t ** handle)                          /* During the real run, we would have to apply the iboost tax */
1396  {                          dbytes = s->scaled_length * rc->pb_iboost_tax_ratio;
     xvid_plugin_2pass2_t * param = (xvid_plugin_2pass2_t *)create->param;  
     rc_2pass2_t * rc;  
1397    
1398      rc = malloc(sizeof(rc_2pass2_t));                          /* Update the symmetric curve compression total */
1399      if (rc == NULL)                          symetric_total += dbytes;
         return XVID_ERR_MEMORY;  
1400    
1401      rc->param = *param;                          /* Apply assymetric curve compression */
1402                            if (dbytes > rc->avg_length[s->type-1])
1403                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * (double)rc->param.curve_compression_high / 100.0f;
1404                            else
1405                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * (double)rc->param.curve_compression_low  / 100.0f;
1406    
1407      if (rc->param.keyframe_boost <= 0) rc->param.keyframe_boost = 0;                          /* Cap to the minimum frame size if needed */
1408      if (rc->param.payback_method <= 0) rc->param.payback_method = XVID_PAYBACK_PROP;                          if (dbytes + assymetric_delta < rc->min_length[s->type-1])
1409      if (rc->param.bitrate_payback_delay <= 0) rc->param.bitrate_payback_delay = 250;                                  assymetric_delta = rc->min_length[s->type-1] - dbytes;
     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;  
1410    
1411      if (!det_stats_length(rc, param->filename)){                          /* Accumulate after assymetric curve compression */
1412          DPRINTF(DPRINTF_RC,"fopen %s failed\n", param->filename);                          assymetric_delta_total += assymetric_delta;
         free(rc);  
         return XVID_ERR_FAIL;  
1413      }      }
1414    
1415      if ((rc->stats = malloc(rc->num_frames * sizeof(stat_t))) == NULL) {                  /* Compute the tax that all p/b frames have to pay in order to respect the
1416          free(rc);                   * bit distribution changes that the assymetric compression curve imposes
1417          return XVID_ERR_MEMORY;                   * We want assymetric_total = sum(0, n-1, tax.scaled_length)
1418                     *      ie assymetric_total = ratio.sum(0, n-1, scaled_length)
1419                     *         ratio = assymetric_total / symmetric_total */
1420                    rc->assymetric_tax_ratio = ((double)symetric_total - (double)assymetric_delta_total) / (double)symetric_total;
1421            } else {
1422                    rc->assymetric_tax_ratio = 1.0f;
1423      }      }
1424    
1425      /* XXX: do we need an addition location */          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Assymetric tax ratio:%.2f\n", rc->assymetric_tax_ratio);
     if ((rc->keyframe_locations = malloc((rc->num_keyframes + 1) * sizeof(int))) == NULL) {  
         free(rc->stats);  
         free(rc);  
         return XVID_ERR_MEMORY;  
     }  
1426    
1427      if (!load_stats(rc, param->filename)) {          /* Last bits that need to be reset */
1428          DPRINTF(DPRINTF_RC,"fopen %s failed\n", param->filename);          rc->overflow = 0;
1429          free(rc->keyframe_locations);          rc->KFoverflow = 0;
1430          free(rc->stats);          rc->KFoverflow_partial = 0;
1431          free(rc);          rc->KF_idx = 0;
1432          return XVID_ERR_FAIL;          rc->desired_total = 0;
1433      }          rc->real_total = 0;
   
     /* pre-process our stats */  
1434    
1435          {          /* Job done */
1436                  if (rc->num_frames  < create->fbase/create->fincr) {          return;
                         rc->target = rc->param.bitrate / 8;     /* one second */  
                 }else{  
                         rc->target = (rc->param.bitrate * rc->num_frames * create->fincr) / (create->fbase * 8);  
1437                  }                  }
1438    
1439    /*****************************************************************************
1440     * VBV compliancy check and scale
1441     * MPEG-4 standard specifies certain restrictions for bitrate/framesize in VBR
1442     * to enable playback on devices with limited readspeed and memory (and which
1443     * aren't...)
1444     *
1445     * DivX profiles have 2 criteria: VBV as in MPEG standard
1446     *                                a limit on peak bitrate for any 3 seconds
1447     *
1448     * But if VBV is fulfilled, peakrate is automatically fulfilled in any profile
1449     * define so far, so we check for it (for completeness) but correct only VBV
1450     *
1451     *****************************************************************************/
1452    
1453                  rc->target -= rc->num_frames*24;        /* avi file header */  #define VBV_COMPLIANT 0
1454    #define VBV_UNDERFLOW 1 /* video buffer runs empty */
1455    #define VBV_OVERFLOW 2  /* doesn't exist for VBR encoding */
1456    #define VBV_PEAKRATE 4  /* peak bitrate (within 3s) violated */
1457    
1458          }  static int check_curve_for_vbv_compliancy(rc_2pass2_t * rc, const float fps)
1459    {
1460    /* We do all calculations in float, for higher accuracy,
1461       and in bytes for convenience
1462    
1463       typical values from DivX Home Theater profile:
1464       vbv_size= 384*1024 (384kB), vbv_initial= 288*1024 (75% fill)
1465       maxrate= 4000000 (4MBps), peakrate= 10000000 (10MBps)
1466    
1467          pre_process0(rc);     PAL: offset3s = 75 (3 seconds of 25fps)
1468          if (rc->param.bitrate) {     NTSC: offset3s = 90 (3 seconds of 29.97fps) or 72 (3 seconds of 23.976fps)
1469                  internal_scale(rc);  */
         }  
         pre_process1(rc);pre_process1(rc);pre_process1(rc);  
1470    
1471      *handle = rc;    const float vbv_size = (float)rc->param.vbv_size/8.f;
1472          return(0);    float vbvfill = (float)rc->param.vbv_initial/8.f;
 }  
1473    
1474      const float maxrate = (float)rc->param.vbv_maxrate;
1475      const float peakrate = (float)rc->param.vbv_peakrate;
1476      const float r0 = (int)(maxrate/fps+0.5)/8.f;
1477    
1478  static int rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy)    int bytes3s = 0;
1479  {    int offset3s = (int)(3.f*fps+0.5);
     free(rc->keyframe_locations);  
     free(rc->stats);  
         free(rc);  
         return(0);  
 }  
1480    
1481      int i;
1482      for (i=0; i<rc->num_frames; i++) {
1483    /* DivX 3s peak bitrate check  */
1484    
1485        bytes3s += rc->stats[i].scaled_length;
1486        if (i>=offset3s)
1487          bytes3s -= rc->stats[i-offset3s].scaled_length;
1488    
1489  static int rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)      if (8.f*bytes3s > 3*peakrate)
1490  {        return VBV_PEAKRATE;
     stat_t * s = &rc->stats[data->frame_num];  
     int overflow;  
     int desired;  
     double dbytes;  
     double curve_temp;  
     int capped_to_max_framesize = 0;  
1491    
1492      if (data->frame_num >= rc->num_frames) {  /* update vbv fill level */
         /* insufficent stats data */  
         return 0;  
     }  
1493    
1494      overflow = rc->overflow / 8;        /* XXX: why by 8 */      vbvfill += r0 - rc->stats[i].scaled_length;
1495    
1496      if (s->type == XVID_TYPE_IVOP) {        /* XXX: why */  /* this check is _NOT_ an "overflow"! only reading from disk stops then */
1497          overflow = 0;      if (vbvfill > vbv_size)
1498      }        vbvfill = vbv_size;
1499    
1500      desired = s->scaled_length;  /* but THIS would be an underflow. report it! */
1501        if (vbvfill < 0)
1502      dbytes = desired;        return VBV_UNDERFLOW;
     if (s->type == XVID_TYPE_IVOP) {  
         dbytes += desired * rc->param.keyframe_boost / 100;  
1503      }      }
     dbytes /= rc->movie_curve;  
1504    
1505      if (s->type == XVID_TYPE_BVOP) {    return VBV_COMPLIANT;
         dbytes *= rc->avg_length[XVID_TYPE_PVOP-1] / rc->avg_length[XVID_TYPE_BVOP-1];  
1506      }      }
1507    /* TODO: store min(vbvfill) and print "minimum buffer fill" */
1508    
     if (rc->param.payback_method == XVID_PAYBACK_BIAS) {  
         desired =(int)(rc->curve_comp_error / rc->param.bitrate_payback_delay);  
     }else{  
                 //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);  
1509    
1510                  if (labs(desired) > fabs(rc->curve_comp_error)) {  static int scale_curve_for_vbv_compliancy(rc_2pass2_t * rc, const float fps)
1511                          desired = (int)rc->curve_comp_error;  {
1512                  }  /* correct any VBV violations. Peak bitrate violations disappears
1513      }     by this automatically
1514    
1515      rc->curve_comp_error -= desired;     This implementation follows
1516    
1517      /* alt curve */     Westerink, Rajagopalan, Gonzales "Two-pass MPEG-2 variable-bitrate encoding"
1518       IBM J. RES. DEVELOP. VOL 43, No. 4, July 1999, p.471--488
1519    
1520      curve_temp = 0; /* XXX: warning */     Thanks, guys! This paper rocks!!!
1521    */
1522    
1523      if (rc->param.use_alt_curve) {  /*
1524          if (s->type != XVID_TYPE_IVOP)  {      For each scene of len N, we have to check up to N^2 possible buffer fills.
1525              if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {      This works well with MPEG-2 where N==12 or so, but for MPEG-4 it's a
1526                  if (dbytes >= rc->alt_curve_high) {      little slow...
                                         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];  
1527    
1528                          curve_temp = curve_temp * rc->curve_comp_scale + rc->alt_curve_curve_bias_bonus;      TODO: Better control on VBVfill between scenes
1529    */
1530    
1531                          desired += ((int)curve_temp);    const float vbv_size = (float)rc->param.vbv_size/8.f;
1532                          rc->curve_comp_error += curve_temp - (int)curve_temp;    const float vbv_initial = (float)rc->param.vbv_initial/8.f;
                 }else{  
                         if (s->type == XVID_TYPE_BVOP)  
                                 dbytes *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
1533    
1534                          desired += ((int)dbytes);    const float maxrate = 0.9*rc->param.vbv_maxrate;
1535                          rc->curve_comp_error += dbytes - (int)dbytes;    const float vbv_low = 0.10f*vbv_size;
1536      const float r0 = (int)(maxrate/fps+0.5)/8.f;
1537    
1538      int i,k,l,n,violation = 0;
1539      float *scenefactor;
1540      int *scenestart;
1541      int *scenelength;
1542    
1543    /* first step: determine how many "scenes" there are and store their boundaries
1544       we could get all this from existing keyframe_positions, somehow, but there we
1545       don't have a min_scenelength, and it's no big deal to get it again.  */
1546    
1547      const int min_scenelength = (int)(fps+0.5);
1548      int num_scenes = 0;
1549      int last_scene = -999;
1550      for (i=0; i<rc->num_frames; i++) {
1551        if ( (rc->stats[i].type == XVID_TYPE_IVOP) && (i-last_scene>min_scenelength) )
1552        {
1553          last_scene = i;
1554          num_scenes++;
1555                  }                  }
   
     }else if ((rc->param.curve_compression_high + rc->param.curve_compression_low) &&   s->type != XVID_TYPE_IVOP) {  
   
         curve_temp = rc->curve_comp_scale;  
         if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {  
             curve_temp *= ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_high / 100.0);  
         } else {  
             curve_temp *= ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_low / 100.0);  
1556          }          }
1557    
1558          if (s->type == XVID_TYPE_BVOP){    scenefactor = (float*)malloc( num_scenes*sizeof(float) );
1559              curve_temp *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];    scenestart = (int*)malloc( num_scenes*sizeof(int) );
1560          }    scenelength = (int*)malloc( num_scenes*sizeof(int) );
1561    
1562          desired += (int)curve_temp;    if ((!scenefactor) || (!scenestart) || (!scenelength) )
1563          rc->curve_comp_error += curve_temp - (int)curve_temp;    {
1564      }else{      free(scenefactor);
1565          if (s->type == XVID_TYPE_BVOP){      free(scenestart);
1566                          dbytes *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];      free(scenelength);
1567        /* remember: free(0) is valid and does exactly nothing. */
1568        return -1;
1569          }          }
1570    
1571                  desired += (int)dbytes;  /* count again and safe the length/position */
                 rc->curve_comp_error += dbytes - (int)dbytes;  
     }  
1572    
1573          if (desired > s->length){    num_scenes = 0;
1574                  rc->curve_comp_error += desired - s->length;    last_scene = -999;
1575                  desired = s->length;    for (i=0; i<rc->num_frames; i++) {
1576          }else{      if ( (rc->stats[i].type == XVID_TYPE_IVOP) && (i-last_scene>min_scenelength) )
1577          if (desired < rc->min_length[s->type-1]) {      {
1578              if (s->type == XVID_TYPE_IVOP){        if (num_scenes>0)
1579                  rc->curve_comp_error -= rc->min_length[XVID_TYPE_IVOP-1] - desired;          scenelength[num_scenes-1]=i-last_scene;
1580              }        scenestart[num_scenes]=i;
1581              desired = rc->min_length[s->type-1];        num_scenes++;
1582          last_scene = i;
1583          }          }
1584          }          }
1585      scenelength[num_scenes-1]=i-last_scene;
1586    
1587      s->desired_length = desired;  /* second step: check for each scene, how much we can scale its frames up or down
1588       such that the VBV restriction is just fulfilled
1589    */
     /* if this keyframe is too close to the next, reduce it's byte allotment  
     XXX: why do we do this after setting the desired length  */  
1590    
         if (s->type == XVID_TYPE_IVOP) {  
                 int KFdistance = rc->keyframe_locations[rc->KF_idx] - rc->keyframe_locations[rc->KF_idx - 1];  
1591    
1592          if (KFdistance < rc->param.kftreshold) {  #define R(k,n) (((n)+1-(k))*r0)     /* how much enters the buffer between frame k and n */
1593      for (l=0; l<num_scenes;l++)
1594      {
1595        const int start = scenestart[l];
1596        const int length = scenelength[l];
1597        twopass_stat_t * frames = &rc->stats[start];
1598    
1599              KFdistance = KFdistance - rc->param.min_key_interval;      float S0n,Skn;
1600        float f,minf = 99999.f;
1601    
1602                          if (KFdistance >= 0) {      S0n=0.;
1603                  int KF_min_size;      for (n=0;n<=length-1;n++)
1604        {
1605          S0n += frames[n].scaled_length;
1606    
1607                                  KF_min_size = desired * (100 - rc->param.kfreduction) / 100;        k=0;
1608                                  if (KF_min_size < 1)        Skn = S0n;
1609                                          KF_min_size = 1;        f = (R(k,n-1) + (vbv_initial - vbv_low)) / Skn;
1610          if (f < minf)
1611            minf = f;
1612    
1613                                  desired = KF_min_size + (desired - KF_min_size) * KFdistance /        for (k=1;k<=n;k++)
1614                                          (rc->param.kftreshold - rc->param.min_key_interval);        {
1615            Skn -= frames[k].scaled_length;
1616    
1617                                  if (desired < 1)          f = (R(k,n-1) + (vbv_size - vbv_low)) / Skn;
1618                                          desired = 1;          if (f < minf)
1619                          }            minf = f;
1620                  }                  }
1621          }          }
1622    
1623      overflow = (int)((double)overflow * desired / rc->avg_length[XVID_TYPE_PVOP-1]);      /* special case: at the end, fill buffer up to vbv_initial again
1624           TODO: Allow other values for buffer fill between scenes
1625           e.g. if n=N is smallest f-value, then check for better value */
1626    
1627          // Foxer: reign in overflow with huge frames      n=length;
1628          if (labs(overflow) > labs(rc->overflow)) {      k=0;
1629                  overflow = rc->overflow;      Skn = S0n;
1630          }      f = R(k,n-1)/Skn;
1631        if (f < minf)
1632          minf = f;
1633    
1634      // Foxer: make sure overflow doesn't run away      for (k=1;k<=n-1;k++)
1635        {
1636          Skn -= frames[k].scaled_length;
1637    
1638          if (overflow > desired * rc->param.max_overflow_improvement / 100) {        f = (R(k,n-1) + (vbv_initial - vbv_low)) / Skn;
1639                  desired += (overflow <= desired) ? desired * rc->param.max_overflow_improvement / 100 :        if (f < minf)
1640                          overflow * rc->param.max_overflow_improvement / 100;          minf = f;
         }else if (overflow < desired * rc->param.max_overflow_degradation / -100){  
                 desired += desired * rc->param.max_overflow_degradation / -100;  
         }else{  
                 desired += overflow;  
1641          }          }
1642    
1643      if (desired > rc->max_length) {  #ifdef VBV_DEBUG
1644                  capped_to_max_framesize = 1;      printf("Scene %d (Frames %d-%d): VBVfactor %f\n", l, start, start+length-1 , minf);
1645                  desired = rc->max_length;  #endif
         }  
1646    
1647      // make sure to not scale below the minimum framesize      scenefactor[l] = minf;
     if (desired < rc->min_length[s->type-1]) {  
         desired = rc->min_length[s->type-1];  
1648      }      }
1649    #undef R
1650    
1651    /* last step: now we know of any scene how much it can be scaled up or down without
1652       violating VBV. Next, distribute bits from the evil scenes to the good ones */
1653    
1654      // very 'simple' quant<->filesize relationship    do
1655      data->quant= (s->quant * s->length) / desired;    {
1656        float S_red = 0.f;    /* how much to redistribute */
1657        float S_elig = 0.f;   /* sum of bit for those scenes you can still swallow something*/
1658            float f_red;
1659        int l;
1660    
1661          if (data->quant < 1) {      for (l=0;l<num_scenes;l++)   /* check how much is wrong */
                 data->quant = 1;  
     } else if (data->quant > 31) {  
                 data->quant = 31;  
         }  
         else if (s->type != XVID_TYPE_IVOP)  
1662          {          {
1663                  // Foxer: aid desired quantizer precision by accumulating decision error      const int start = scenestart[l];
1664                  if (s->type== XVID_TYPE_BVOP) {      const int length = scenelength[l];
1665                          rc->bquant_error[data->quant] += ((double)(s->quant * s->length) / desired) - data->quant;      twopass_stat_t * frames = &rc->stats[start];
1666    
1667                          if (rc->bquant_error[data->quant] >= 1.0) {        if (scenefactor[l] == 1.) /* exactly 1 means "don't touch this anymore!" */
1668                                  rc->bquant_error[data->quant] -= 1.0;          continue;
                                 data->quant++;  
                         }  
                 }else{  
                         rc->pquant_error[data->quant] += ((double)(s->quant * s->length) / desired) - data->quant;  
1669    
1670              if (rc->pquant_error[data->quant] >= 1.0) {        if (scenefactor[l] > 1.) /* within limits */
1671                                  rc->pquant_error[data->quant] -= 1.0;        {
1672                                  ++data->quant;          for (n= 0; n < length; n++)
1673              S_elig += frames[n].scaled_length;
1674          }
1675          else /* underflowing segment */
1676          {
1677            for (n= 0; n < length; n++)
1678            {
1679              float newbytes = (float)frames[n].scaled_length * scenefactor[l];
1680              S_red += (float)frames[n].scaled_length - (float)newbytes;
1681              frames[n].scaled_length =(int)newbytes;
1682                          }                          }
1683            scenefactor[l] = 1.f;
1684                  }                  }
1685          }          }
1686    
1687      /* cap to min/max quant */      if (S_red < 1.f)   /* no more underflows */
1688          break;
1689    
1690      if (data->quant < data->min_quant[s->type-1]) {      if (S_elig < 1.f)
1691          data->quant = data->min_quant[s->type-1];      {
1692      }else if (data->quant > data->max_quant[s->type-1]) {  #ifdef VBV_DEBUG
1693          data->quant = data->max_quant[s->type-1];        fprintf(stderr,"Everything underflowing. \n");
1694      }  #endif
1695          free(scenefactor);
1696          free(scenestart);
1697          free(scenelength);
1698          return -2;
1699        }
1700    
1701        f_red = (1.f + S_red/S_elig);
1702    
1703    #ifdef VBV_DEBUG
1704        printf("Moving %.0f kB to avoid buffer underflow, correction factor: %.5f\n",S_red/1024.f,f_red);
1705    #endif
1706    
1707      /* subsequent p/b frame quants can only be +- 2 */      violation=0;
1708          if (s->type != XVID_TYPE_IVOP && rc->last_quant[s->type-1] && capped_to_max_framesize == 0) {      for (l=0; l<num_scenes; l++)   /* scale remaining scenes up to meet total size */
1709        {
1710          const int start = scenestart[l];
1711          const int length = scenelength[l];
1712          twopass_stat_t * frames = &rc->stats[start];
1713    
1714                  if (data->quant > rc->last_quant[s->type-1] + 2) {        if (scenefactor[l] == 1.)
1715                          data->quant = rc->last_quant[s->type-1] + 2;          continue;
1716                          DPRINTF(DPRINTF_RC, "p/b-frame quantizer prevented from rising too steeply");  
1717                  }        /* there shouldn't be any segments with factor<1 left, so all the rest is >1 */
1718                  if (data->quant < rc->last_quant[s->type-1] - 2) {  
1719                          data->quant = rc->last_quant[s->type-1] - 2;        for (n= 0; n < length; n++)
1720                          DPRINTF(DPRINTF_RC, "p/b-frame quantizer prevented from falling too steeply");        {
1721                  }          frames[n].scaled_length = (int)(frames[n].scaled_length * f_red + 0.5);
1722          }          }
1723    
1724          if (capped_to_max_framesize == 0) {        scenefactor[l] /= f_red;
1725          rc->last_quant[s->type-1] = data->quant;        if (scenefactor[l] < 1.f)
1726            violation=1;
1727          }          }
1728    
1729      } while (violation);
1730    
1731      free(scenefactor);
1732      free(scenestart);
1733      free(scenelength);
1734          return 0;          return 0;
1735  }  }
1736    
1737    
1738    /*****************************************************************************
1739  static int rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)   * Still more low level stuff (nothing to do with stats treatment)
1740     ****************************************************************************/
1741    
1742    /* This function returns an allocated string containing a complete line read
1743     * from the file starting at the current position */
1744    static char *
1745    readline(FILE *f)
1746  {  {
1747      stat_t * s = &rc->stats[data->frame_num];          char *buffer = NULL;
1748            int buffer_size = 0;
1749            int pos = 0;
1750    
1751      if (data->frame_num >= rc->num_frames) {          do {
1752          /* insufficent stats data */                  int c;
         return 0;  
     }  
1753    
1754      rc->quant_count[data->quant]++;                  /* Read a character from the stream */
1755                    c = fgetc(f);
1756    
1757      if (data->type == XVID_TYPE_IVOP) {                  /* Is that EOF or new line ? */
1758          int kfdiff = (rc->keyframe_locations[rc->KF_idx] -      rc->keyframe_locations[rc->KF_idx - 1]);                  if(c == EOF || c == '\n')
1759                            break;
         rc->overflow += rc->KFoverflow;  
         rc->KFoverflow = s->desired_length - data->length;  
1760    
1761          if (kfdiff > 1) {  // non-consecutive keyframes                  /* Do we have to update buffer ? */
1762              rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);                  if(pos >= buffer_size - 1) {
1763          }else{ // consecutive keyframes                          buffer_size += BUF_SZ;
1764                          rc->overflow += rc->KFoverflow;                          buffer = (char*)realloc(buffer, buffer_size);
1765                          rc->KFoverflow = 0;                          if (buffer == NULL)
1766                          rc->KFoverflow_partial = 0;                                  return(NULL);
         }  
         rc->KF_idx++;  
     }else{  
         // distribute part of the keyframe overflow  
         rc->overflow += s->desired_length - data->length + rc->KFoverflow_partial;  
         rc->KFoverflow -= rc->KFoverflow_partial;  
1767      }      }
1768    
1769      printf("[%i] quant:%i stats1:%i scaled:%i actual:%i overflow:%i\n",                  buffer[pos] = c;
1770          data->frame_num,                  pos++;
1771          data->quant,          } while(1);
         s->length,  
         s->scaled_length,  
         data->length,  
         rc->overflow);  
1772    
1773      return(0);          /* Read \n or EOF */
1774            if (buffer == NULL) {
1775                    /* EOF, so we reached the end of the file, return NULL */
1776                    if(feof(f))
1777                            return(NULL);
1778    
1779                    /* Just an empty line with just a newline, allocate a 1 byte buffer to
1780                     * store a zero length string */
1781                    buffer = (char*)malloc(1);
1782                    if(buffer == NULL)
1783                            return(NULL);
1784  }  }
1785    
1786            /* Zero terminated string */
1787            buffer[pos] = '\0';
1788    
1789            return(buffer);
1790    }
1791    
1792  int xvid_plugin_2pass2(void * handle, int opt, void * param1, void * param2)  /* This function returns a pointer to the first non space char in the given
1793     * string */
1794    static char *
1795    skipspaces(char *string)
1796  {  {
1797      switch(opt)          const char spaces[] =
1798      {      {
1799      case XVID_PLG_INFO :                          ' ','\t','\0'
1800          return 0;                  };
1801            const char *spacechar = spaces;
1802    
1803            if (string == NULL) return(NULL);
1804    
1805            while (*string != '\0') {
1806                    /* Test against space chars */
1807                    while (*spacechar != '\0') {
1808                            if (*string == *spacechar) {
1809                                    string++;
1810                                    spacechar = spaces;
1811                                    break;
1812                            }
1813                            spacechar++;
1814                    }
1815    
1816      case XVID_PLG_CREATE :                  /* No space char */
1817          return rc_2pass2_create((xvid_plg_create_t*)param1, param2);                  if (*spacechar == '\0') return(string);
1818            }
1819    
1820      case XVID_PLG_DESTROY :          return(string);
1821          return rc_2pass2_destroy((rc_2pass2_t*)handle, (xvid_plg_destroy_t*)param1);  }
1822    
1823      case XVID_PLG_BEFORE :  /* This function returns a boolean that tells if the string is only a
1824          return rc_2pass2_before((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);   * comment */
1825    static int
1826    iscomment(char *string)
1827    {
1828            const char comments[] =
1829                    {
1830                            '#',';', '%', '\0'
1831                    };
1832            const char *cmtchar = comments;
1833            int iscomment = 0;
1834    
1835            if (string == NULL) return(1);
1836    
1837            string = skipspaces(string);
1838    
1839            while(*cmtchar != '\0') {
1840                    if(*string == *cmtchar) {
1841                            iscomment = 1;
1842                            break;
1843                    }
1844                    cmtchar++;
1845            }
1846    
1847      case XVID_PLG_AFTER :          return(iscomment);
         return rc_2pass2_after((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);  
1848      }      }
1849    
1850      return XVID_ERR_FAIL;  #if 0
1851    static void
1852    stats_print(rc_2pass2_t * rc)
1853    {
1854            int i;
1855            const char frame_type[4] = { 'i', 'p', 'b', 's'};
1856    
1857            for (i=0; i<rc->num_frames; i++) {
1858                    twopass_stat_t *s = &rc->stats[i];
1859                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- frame:%d type:%c quant:%d stats:%d scaled:%d desired:%d actual:%d overflow(%c):%.2f\n",
1860                                    i, frame_type[s->type-1], -1, s->length, s->scaled_length,
1861                                    s->desired_length, -1, frame_type[s->type-1], -1.0f);
1862            }
1863  }  }
1864    #endif
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