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revision 1.1.2.6, Tue May 20 17:28:25 2003 UTC revision 1.1.2.35, Wed Jan 21 06:59:23 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  #include <stdio.h>  #include <stdio.h>
39  #include <math.h>  #include <math.h>
40    #include <limits.h>
 #define RAD2DEG 57.295779513082320876798154814105  
 #define DEG2RAD 0.017453292519943295769236907684886  
41    
42  #include "../xvid.h"  #include "../xvid.h"
43  #include "../image/image.h"  #include "../image/image.h"
44    
45    /*****************************************************************************
46     * Some default settings
47     ****************************************************************************/
48    
49    #define DEFAULT_KEYFRAME_BOOST 0
50    #define DEFAULT_OVERFLOW_CONTROL_STRENGTH 10
51    #define DEFAULT_CURVE_COMPRESSION_HIGH 0
52    #define DEFAULT_CURVE_COMPRESSION_LOW 0
53    #define DEFAULT_MAX_OVERFLOW_IMPROVEMENT 10
54    #define DEFAULT_MAX_OVERFLOW_DEGRADATION 10
55    
56    /* Keyframe settings */
57    #define DEFAULT_KFREDUCTION 20
58    #define DEFAULT_KFTHRESHOLD 1
59    
60    /*****************************************************************************
61     * Some default constants (can be tuned)
62     ****************************************************************************/
63    
64    /* Specify the invariant part of the headers bits (header+MV)
65     * as  hlength/cst */
66    #define INVARIANT_HEADER_PART_IVOP 1 /* factor 1.0f   */
67    #define INVARIANT_HEADER_PART_PVOP 2 /* factor 0.5f   */
68    #define INVARIANT_HEADER_PART_BVOP 8 /* factor 0.125f */
69    
70    /*****************************************************************************
71     * Structures
72     ****************************************************************************/
73    
74    /* Statistics */
75  typedef struct {  typedef struct {
76      int type;               /* first pass type */      int type;               /* first pass type */
77      int quant;              /* first pass quant */      int quant;              /* first pass quant */
78          int blks[3];                    /* k,m,y blks */          int blks[3];                    /* k,m,y blks */
79      int length;             /* first pass length */      int length;             /* first pass length */
80            int invariant;          /* what we assume as being invariant between the two passes, it's a sub part of header + MV bits */
81      int scaled_length;      /* scaled length */      int scaled_length;      /* scaled length */
82      int desired_length;     /* desired length; calcuated during encoding */          int desired_length;     /* desired length; calculated during encoding */
83            int error;
84    
85      int zone_mode;   /* XVID_ZONE_xxx */      int zone_mode;   /* XVID_ZONE_xxx */
86      double weight;      double weight;
87  } stat_t;  } twopass_stat_t;
88    
89    /* Context struct */
   
   
 /* context struct */  
90  typedef struct  typedef struct
91  {  {
92      xvid_plugin_2pass2_t param;      xvid_plugin_2pass2_t param;
93    
94      /* constant statistical data */          /*----------------------------------
95             * constant statistical data
96             *--------------------------------*/
97    
98            /* Number of frames of the sequence */
99          int num_frames;          int num_frames;
100    
101            /* Number of Intra frames of the sequence */
102      int num_keyframes;      int num_keyframes;
     uint64_t target;    /* target filesize */  
103    
104      int count[3];   /* count of each frame types */          /* Target filesize to reach */
105      uint64_t tot_length[3];  /* total length of each frame types */          uint64_t target;
     double avg_length[3];   /* avg */  
     int min_length[3];  /* min frame length of each frame types */  
     uint64_t tot_scaled_length[3];  /* total scaled length of each frame type */  
     int max_length;     /* max frame size */  
   
     /* zone statistical data */  
     double avg_weight;  /* average weight */  
     int64_t tot_quant;   /* total length used by XVID_ZONE_QUANT zones */  
   
   
     double curve_comp_scale;  
     double movie_curve;  
   
         double alt_curve_low;  
         double alt_curve_high;  
         double alt_curve_low_diff;  
         double alt_curve_high_diff;  
     double alt_curve_curve_bias_bonus;  
         double alt_curve_mid_qual;  
         double alt_curve_qual_dev;  
106    
107      /* dynamic */          /* Count of each frame types */
108            int count[3];
109    
110            /* Total length of each frame types (1st pass) */
111            uint64_t tot_length[3];
112            uint64_t tot_invariant[3];
113    
114            /* Average length of each frame types (used first for 1st pass data and
115             * then for scaled averages */
116            double avg_length[3];
117    
118            /* Minimum frame length allowed for each frame type */
119            int min_length[3];
120    
121            /* Total bytes per frame type once the curve has been scaled
122             * NB: advanced parameters do not change this value. This field
123             *     represents the total scaled w/o any advanced settings */
124            uint64_t tot_scaled_length[3];
125    
126            /* Maximum observed frame size observed during the first pass, the RC
127             * will try tp force all frame sizes in the second pass to be under that
128             * limit */
129            int max_length;
130    
131            /*----------------------------------
132             * Zones statistical data
133             *--------------------------------*/
134    
135            /* Total length used by XVID_ZONE_QUANT zones */
136            uint64_t tot_quant;
137            uint64_t tot_quant_invariant;
138    
139            /* Holds the total amount of frame bytes, zone weighted (only scalable
140             * part of frame bytes) */
141            uint64_t tot_weighted;
142    
143            /*----------------------------------
144             * Advanced settings helper ratios
145             *--------------------------------*/
146    
147            /* This the ratio that has to be applied to all p/b frames in order
148             * to reserve/retrieve bits for/from keyframe boosting and consecutive
149             * keyframe penalty */
150            double pb_iboost_tax_ratio;
151    
152            /* This the ratio to apply to all b/p frames in order to respect the
153             * assymetric curve compression while respecting a target filesize
154             * NB: The assymetric delta gain has to be computed before this ratio
155             *     is applied, and then the delta is added to the scaled size */
156            double assymetric_tax_ratio;
157    
158            /*----------------------------------
159             * Data from the stats file kept
160             * into RAM for easy access
161             *--------------------------------*/
162    
163            /* Array of keyframe locations
164             * eg: rc->keyframe_locations[100] returns the frame number of the 100th
165             *     keyframe */
166      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];  
167    
168      double curve_comp_error;          /* Index of the last keyframe used in the keyframe_location */
     int overflow;  
     int KFoverflow;  
     int KFoverflow_partial;  
169      int KF_idx;      int KF_idx;
170    
171      double fq_error;          /* Array of all 1st pass data file -- see the twopass_stat_t structure
172  } rc_2pass2_t;           * definition for more details */
173            twopass_stat_t * stats;
174    
175            /*----------------------------------
176             * Histerysis helpers
177             *--------------------------------*/
178    
179            /* This field holds the int2float conversion errors of each quant per
180             * frame type, this allow the RC to keep track of rouding error and thus
181             * increase or decrease the chosen quant according to this residue */
182            double quant_error[3][32];
183    
184            /* This fields stores the count of each quant usage per frame type
185             * No real role but for debugging */
186            int quant_count[3][32];
187    
188            /* Last valid quantizer used per frame type, it allows quantizer
189             * increament/decreament limitation in order to avoid big image quality
190             * "jumps" */
191            int last_quant[3];
192    
193            /*----------------------------------
194             * Overflow control
195             *--------------------------------*/
196    
197            /* Current overflow that has to be distributed to p/b frames */
198            double overflow;
199    
200            /* Total overflow for keyframes -- not distributed directly */
201            double KFoverflow;
202    
203            /* Amount of keyframe overflow to introduce to the global p/b frame
204             * overflow counter at each encoded frame */
205            double KFoverflow_partial;
206    
207            /* Unknown ???
208             * ToDo: description */
209            double fq_error;
210    
211  #define BUF_SZ 1024          /*----------------------------------
212  #define MAX_COLS    5           * Debug
213             *--------------------------------*/
214            double desired_total;
215            double real_total;
216    } rc_2pass2_t;
217    
218    
219  /* open stats file, and count num frames */  /*****************************************************************************
220     * Sub plugin functions prototypes
221     ****************************************************************************/
222    
223    static int rc_2pass2_create(xvid_plg_create_t * create, rc_2pass2_t ** handle);
224    static int rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data);
225    static int rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data);
226    static int rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy);
227    
228    /*****************************************************************************
229     * Plugin definition
230     ****************************************************************************/
231    
232  static int det_stats_length(rc_2pass2_t * rc, char * filename)  int
233    xvid_plugin_2pass2(void * handle, int opt, void * param1, void * param2)
234  {  {
235      FILE * f;          switch(opt) {
236      int n, ignore;          case XVID_PLG_INFO :
237      char type;          case XVID_PLG_FRAME :
   
     rc->num_frames = 0;  
     rc->num_keyframes = 0;  
   
     if ((f = fopen(filename, "rt")) == NULL)  
238          return 0;          return 0;
239    
240      while((n = fscanf(f, "%c %d %d %d %d %d %d\n",          case XVID_PLG_CREATE :
241          &type, &ignore, &ignore, &ignore, &ignore, &ignore, &ignore)) != EOF) {                  return rc_2pass2_create((xvid_plg_create_t*)param1, param2);
         if (type == 'i') {  
             rc->num_frames++;  
             rc->num_keyframes++;  
         }else if (type == 'p' || type == 'b' || type == 's') {  
             rc->num_frames++;  
         }  
     }  
242    
243      fclose(f);          case XVID_PLG_DESTROY :
244                    return rc_2pass2_destroy((rc_2pass2_t*)handle, (xvid_plg_destroy_t*)param1);
245    
246            case XVID_PLG_BEFORE :
247                    return rc_2pass2_before((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);
248    
249      return 1;          case XVID_PLG_AFTER :
250                    return rc_2pass2_after((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);
251  }  }
252    
253            return XVID_ERR_FAIL;
254    }
255    
256    /*****************************************************************************
257     * Sub plugin functions definitions
258     ****************************************************************************/
259    
260    /* First a few local helping function prototypes */
261    static  int statsfile_count_frames(rc_2pass2_t * rc, char * filename);
262    static  int statsfile_load(rc_2pass2_t *rc, char * filename);
263    static void zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create);
264    static void first_pass_stats_prepare_data(rc_2pass2_t * rc);
265    static void first_pass_scale_curve_internal(rc_2pass2_t *rc);
266    static void scaled_curve_apply_advanced_parameters(rc_2pass2_t * rc);
267    #if 0
268    static void stats_print(rc_2pass2_t * rc);
269    #endif
270    
271  /* open stats file(s) and read into rc->stats array */  /*----------------------------------------------------------------------------
272     *--------------------------------------------------------------------------*/
273    
274  static int load_stats(rc_2pass2_t *rc, char * filename)  static int
275    rc_2pass2_create(xvid_plg_create_t * create, rc_2pass2_t **handle)
276  {  {
277      FILE * f;          xvid_plugin_2pass2_t * param = (xvid_plugin_2pass2_t *)create->param;
278      int i, not_scaled;          rc_2pass2_t * rc;
279            int i;
280    
281            rc = malloc(sizeof(rc_2pass2_t));
282            if (rc == NULL)
283                    return XVID_ERR_MEMORY;
284    
285      if ((f = fopen(filename, "rt"))==NULL)          rc->param = *param;
         return 0;  
286    
287      i = 0;          /* Initialize all defaults */
288          not_scaled = 0;  #define _INIT(a, b) if((a) <= 0) (a) = (b)
289      while(i < rc->num_frames) {          /* Let's set our defaults if needed */
290          stat_t * s = &rc->stats[i];          _INIT(rc->param.keyframe_boost, DEFAULT_KEYFRAME_BOOST);
291          int n;          _INIT(rc->param.overflow_control_strength, DEFAULT_OVERFLOW_CONTROL_STRENGTH);
292          char type;          _INIT(rc->param.curve_compression_high, DEFAULT_CURVE_COMPRESSION_HIGH);
293            _INIT(rc->param.curve_compression_low, DEFAULT_CURVE_COMPRESSION_LOW);
294            _INIT(rc->param.max_overflow_improvement, DEFAULT_MAX_OVERFLOW_IMPROVEMENT);
295            _INIT(rc->param.max_overflow_degradation,  DEFAULT_MAX_OVERFLOW_DEGRADATION);
296    
297            /* Keyframe settings */
298            _INIT(rc->param.kfreduction, DEFAULT_KFREDUCTION);
299            _INIT(rc->param.kfthreshold, DEFAULT_KFTHRESHOLD);
300    #undef _INIT
301    
302                  s->scaled_length = 0;          /* Initialize some stuff to zero */
303          n = fscanf(f, "%c %d %d %d %d %d %d\n", &type, &s->quant, &s->blks[0], &s->blks[1], &s->blks[2], &s->length, &s->scaled_length);          for(i=0; i<3; i++) {
304          if (n == EOF) break;                  int j;
305                  if (n < 7) {                  for (j=0; j<32; j++) {
306                          not_scaled = 1;                          rc->quant_error[i][j] = 0;
307                            rc->quant_count[i][j] = 0;
308                  }                  }
   
         if (type == 'i') {  
             s->type = XVID_TYPE_IVOP;  
         }else if (type == 'p' || type == 's') {  
             s->type = XVID_TYPE_PVOP;  
         }else if (type == 'b') {  
             s->type = XVID_TYPE_BVOP;  
         }else{  /* unknown type */  
             DPRINTF(XVID_DEBUG_RC, "unknown stats frame type; assuming pvop");  
             s->type = XVID_TYPE_PVOP;  
309          }          }
310    
311          i++;          for (i=0; i<3; i++) rc->last_quant[i] = 0;
312    
313            rc->fq_error = 0;
314    
315            /* Count frames (and intra frames) in the stats file, store the result into
316             * the rc structure */
317            if (statsfile_count_frames(rc, param->filename) == -1) {
318                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- ERROR: fopen %s failed\n", param->filename);
319                    free(rc);
320                    return(XVID_ERR_FAIL);
321      }      }
     rc->num_frames = i;  
322    
323      fclose(f);          /* Allocate the stats' memory */
324            if ((rc->stats = malloc(rc->num_frames * sizeof(twopass_stat_t))) == NULL) {
325                    free(rc);
326                    return(XVID_ERR_MEMORY);
327            }
328    
329      return 1;          /* Allocate keyframes location's memory
330             * PS: see comment in pre_process0 for the +1 location requirement */
331            rc->keyframe_locations = malloc((rc->num_keyframes + 1) * sizeof(int));
332            if (rc->keyframe_locations == NULL) {
333                    free(rc->stats);
334                    free(rc);
335                    return(XVID_ERR_MEMORY);
336  }  }
337    
338            /* Load the first pass stats */
339            if (statsfile_load(rc, param->filename) == -1) {
340                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- ERROR: fopen %s failed\n", param->filename);
341                    free(rc->keyframe_locations);
342                    free(rc->stats);
343                    free(rc);
344                    return XVID_ERR_FAIL;
345            }
346    
347            /* Compute the target filesize */
348            if (rc->param.bitrate<0) {
349                    /* if negative, bitrate equals the target (in kbytes) */
350                    rc->target = ((uint64_t)(-rc->param.bitrate)) * 1024;
351            } else if (rc->num_frames  < create->fbase/create->fincr) {
352                    /* Source sequence is less than 1s long, we do as if it was 1s long */
353                    rc->target = rc->param.bitrate / 8;
354            } else {
355                    /* Target filesize = bitrate/8 * numframes / framerate */
356                    rc->target =
357                            ((uint64_t)rc->param.bitrate * (uint64_t)rc->num_frames * \
358                             (uint64_t)create->fincr) / \
359                            ((uint64_t)create->fbase * 8);
360            }
361    
362            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Frame rate: %d/%d (%ffps)\n",
363                            create->fbase, create->fincr,
364                            (double)create->fbase/(double)create->fincr);
365            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Number of frames: %d\n", rc->num_frames);
366            if(rc->param.bitrate>=0)
367                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Target bitrate: %ld\n", rc->param.bitrate);
368            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Target filesize: %lld\n", rc->target);
369    
370            /* Compensate the average frame overhead caused by the container */
371            rc->target -= rc->num_frames*rc->param.container_frame_overhead;
372            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Container Frame overhead: %d\n", rc->param.container_frame_overhead);
373            if(rc->param.container_frame_overhead)
374                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- New target filesize after container compensation: %lld\n", rc->target);
375    
376  #if 0          /* When bitrate is not given it means it has been scaled by an external
377  static void print_stats(rc_2pass2_t * rc)           * application */
378  {          if (rc->param.bitrate) {
379      int i;                  /* Apply zone settings
380                     * - set rc->tot_quant which represents the total num of bytes spent in
381                     *   fixed quant zones
382                     * - set rc->tot_weighted which represents the total amount of bytes
383                     *   spent in normal or weighted zones in first pass (normal zones can
384                     *   be considered weight=1)
385                     * - set rc->tot_quant_invariant which represents the total num of bytes
386                     *   spent in fixed quant zones for headers */
387                    zone_process(rc, create);
388            } else {
389                    /* External scaling -- zones are ignored */
390      for (i = 0; i < rc->num_frames; i++) {      for (i = 0; i < rc->num_frames; i++) {
391          stat_t * s = &rc->stats[i];                          rc->stats[i].zone_mode = XVID_ZONE_WEIGHT;
392          DPRINTF(XVID_DEBUG_RC, "%i %i %i %i\n", s->type, s->quant, s->length, s->scaled_length);                          rc->stats[i].weight = 1.0;
393      }      }
394                    rc->tot_quant = 0;
395  }  }
 #endif  
396    
397  /* pre-process the statistics data          /* Gathers some information about first pass stats:
398      - for each type, count, tot_length, min_length, max_length           *  - finds the minimum frame length for each frame type during 1st pass.
399      - set keyframes_locations           *     rc->min_size[]
400             *  - determines the maximum frame length observed (no frame type distinction).
401             *     rc->max_size
402             *  - count how many times each frame type has been used.
403             *     rc->count[]
404             *  - total bytes used per frame type
405             *     rc->tot_length[]
406             *  - total bytes considered invariant between the 2 passes
407             *  - store keyframe location
408             *     rc->keyframe_locations[]
409  */  */
410            first_pass_stats_prepare_data(rc);
411    
412  void pre_process0(rc_2pass2_t * rc)          /* If we have a user bitrate, it means it's an internal curve scaling */
413  {          if (rc->param.bitrate) {
414      int i,j;                  /* Perform internal curve scaling */
415                    first_pass_scale_curve_internal(rc);
     for (i=0; i<3; i++) {  
         rc->count[i]=0;  
         rc->tot_length[i] = 0;  
         rc->last_quant[i] = 0;  
416      }      }
417    
418      for (i=j=0; i<rc->num_frames; i++) {          /* Apply advanced curve options, and compute some parameters in order to
419          stat_t * s = &rc->stats[i];           * shape the curve in the BEFORE/AFTER pair of functions */
420            scaled_curve_apply_advanced_parameters(rc);
         rc->count[s->type-1]++;  
         rc->tot_length[s->type-1] += s->length;  
421    
422          if (i == 0 || s->length < rc->min_length[s->type-1]) {          *handle = rc;
423              rc->min_length[s->type-1] = s->length;          return(0);
424          }          }
425    
426          if (i == 0 || s->length > rc->max_length) {  /*----------------------------------------------------------------------------
427              rc->max_length = s->length;   *--------------------------------------------------------------------------*/
         }  
428    
429          if (s->type == XVID_TYPE_IVOP) {  static int
430              rc->keyframe_locations[j] = i;  rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy)
431              j++;  {
432          }          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- target_total:%lld desired_total:%.2f (%.2f%%) actual_total:%.2f (%.2f%%)\n",
433      }                          rc->target,
434      rc->keyframe_locations[j] = i;                          rc->desired_total,
435  }                          100*rc->desired_total/(double)rc->target,
436                            rc->real_total,
437                            100*rc->real_total/(double)rc->target);
438    
439            free(rc->keyframe_locations);
440            free(rc->stats);
441            free(rc);
442            return(0);
443    }
444    
445  /* calculate zone weight "center" */  /*----------------------------------------------------------------------------
446     *--------------------------------------------------------------------------*/
447    
448  static void zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)  static int
449    rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)
450  {  {
451      int i,j;          twopass_stat_t * s = &rc->stats[data->frame_num];
452      int n = 0;          double dbytes;
453            double scaled_quant;
454            double overflow;
455            int capped_to_max_framesize = 0;
456    
457      rc->avg_weight = 0.0;          /* This function is quite long but easy to understand. In order to simplify
458      rc->tot_quant = 0;           * the code path (a bit), we treat 3 cases that can return immediatly. */
459    
460            /* First case: Another plugin has already set a quantizer */
461            if (data->quant > 0)
462                    return(0);
463    
464      if (create->num_zones == 0) {          /* Second case: insufficent stats data
465          for (j = 0; j < rc->num_frames; j++) {           * We can't guess much what we should do, let core decide all alone */
466              rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;          if (data->frame_num >= rc->num_frames) {
467              rc->stats[j].weight = 1.0;                  DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- stats file too short (now processing frame %d)",
468          }                          data->frame_num);
469          rc->avg_weight += rc->num_frames * 1.0;                  return(0);
         n += rc->num_frames;  
470      }      }
471    
472            /* Third case: We are in a Quant zone
473             * Quant zones must just ensure we use the same settings as first pass
474             * So set the quantizer and the type */
475            if (s->zone_mode == XVID_ZONE_QUANT) {
476                    /* Quant stuff */
477                    rc->fq_error += s->weight;
478                    data->quant = (int)rc->fq_error;
479                    rc->fq_error -= data->quant;
480    
481      for(i=0; i < create->num_zones; i++) {                  /* The type stuff */
482                    data->type = s->type;
483    
484          int next = (i+1<create->num_zones) ? create->zones[i+1].frame : rc->num_frames;                  /* The only required data for AFTER step is this one for the overflow
485                     * control */
486                    s->desired_length = s->length;
487    
488          if (i==0 && create->zones[i].frame > 0) {                  return(0);
             for (j = 0; j < create->zones[i].frame && j < rc->num_frames; j++) {  
                 rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;  
                 rc->stats[j].weight = 1.0;  
             }  
             rc->avg_weight += create->zones[i].frame * 1.0;  
             n += create->zones[i].frame;  
489          }          }
490    
         if (create->zones[i].mode == XVID_ZONE_WEIGHT) {  
             for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {  
                 rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;  
                 rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;  
             }  
             next -= create->zones[i].frame;  
             rc->avg_weight += (double)(next * create->zones[i].increment) / (double)create->zones[i].base;  
             n += next;  
         }else{  // XVID_ZONE_QUANT  
             for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {  
                 rc->stats[j].zone_mode = XVID_ZONE_QUANT;  
                 rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;  
                 rc->tot_quant += rc->stats[j].length;  
             }  
         }  
     }  
     rc->avg_weight = n>0 ? rc->avg_weight/n : 1.0;  
491    
492      DPRINTF(XVID_DEBUG_RC, "center_weight: %f (for %i frames);   fixed_bytes: %i\n", rc->avg_weight, n, rc->tot_quant);          /*************************************************************************/
493  }          /*************************************************************************/
494            /*************************************************************************/
495    
496            /*-------------------------------------------------------------------------
497             * Frame bit allocation first part
498             *
499             * First steps apply user settings, just like it is done in the theoritical
500             * scaled_curve_apply_advanced_parameters
501             *-----------------------------------------------------------------------*/
502    
503            /* Set desired to what we are wanting to obtain for this frame */
504            dbytes = (double)s->scaled_length;
505    
506  /* scale the curve */          /* IFrame user settings*/
507            if (s->type == XVID_TYPE_IVOP) {
508                    /* Keyframe boosting -- All keyframes benefit from it */
509                    dbytes += dbytes*rc->param.keyframe_boost / 100;
510    
511  static void internal_scale(rc_2pass2_t *rc)  #if 0 /* ToDo: decide how to apply kfthresholding */
512  {  #endif
513          int64_t target  = rc->target - rc->tot_quant;          } else {
         int64_t pass1_length = rc->tot_length[0] + rc->tot_length[1] + rc->tot_length[2] - rc->tot_quant;  
         int min_size[3];  
         double scaler;  
         int i;  
514    
515                    /* P/S/B frames must reserve some bits for iframe boosting */
516                    dbytes *= rc->pb_iboost_tax_ratio;
517    
518          /* perform an initial scale pass.                  /* Apply assymetric curve compression */
519             if a frame size is scaled underneath our hardcoded minimums, then we force the                  if (rc->param.curve_compression_high || rc->param.curve_compression_low) {
520             frame size to the minimum, and deduct the original & scaled frmae length from the                          double assymetric_delta;
521             original and target total lengths */  
522                            /* Compute the assymetric delta, this is computed before applying
523                             * the tax, as done in the pre_process function */
524                            if (dbytes > rc->avg_length[s->type-1])
525                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_high / 100.0;
526                            else
527                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_low  / 100.0;
528    
529                            /* Now we must apply the assymetric tax, else our curve compression
530                             * would not give a theoritical target size equal to what it is
531                             * expected */
532                            dbytes *= rc->assymetric_tax_ratio;
533    
534                            /* Now we can add the assymetric delta */
535                            dbytes += assymetric_delta;
536                    }
537            }
538    
539          min_size[0] = ((rc->stats[0].blks[0]*22) + 240) / 8;          /* That is what we would like to have -- Don't put that chunk after
540          min_size[1] = (rc->stats[0].blks[0] + 88) / 8;           * overflow control, otherwise, overflow is counted twice and you obtain
541          min_size[2] = 8;           * half sized bitrate sequences */
542            s->desired_length  = (int)dbytes;
543            rc->desired_total += dbytes;
544    
545          scaler = (double)target / (double)pass1_length;          /*------------------------------------------------------------------------
546             * Frame bit allocation: overflow control part.
547             *
548             * Unlike the theoritical scaled_curve_apply_advanced_parameters, here
549             * it's real encoding and we need to make sure we don't go so far from
550             * what is our ideal scaled curve.
551             *-----------------------------------------------------------------------*/
552    
553            /* Compute the overflow we should compensate */
554            if (s->type != XVID_TYPE_IVOP || rc->overflow > 0) {
555                    double frametype_factor;
556                    double framesize_factor;
557    
558          if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {                  /* Take only the desired part of overflow */
559                  DPRINTF(XVID_DEBUG_RC, "undersize warning\n");                  overflow = rc->overflow;
         scaler = 1.0;  
         }  
560    
561      DPRINTF(XVID_DEBUG_RC, "target=%i, tot_length=%i, scaler=%f\n", (int)target, (int)pass1_length, scaler);                  /* Factor that will take care to decrease the overflow applied
562                     * according to the importance of this frame type in term of
563                     * overall size */
564                    frametype_factor  = rc->count[XVID_TYPE_IVOP-1]*rc->avg_length[XVID_TYPE_IVOP-1];
565                    frametype_factor += rc->count[XVID_TYPE_PVOP-1]*rc->avg_length[XVID_TYPE_PVOP-1];
566                    frametype_factor += rc->count[XVID_TYPE_BVOP-1]*rc->avg_length[XVID_TYPE_BVOP-1];
567                    frametype_factor /= rc->count[s->type-1]*rc->avg_length[s->type-1];
568                    frametype_factor  = 1/frametype_factor;
569    
570                    /* Factor that will take care not to compensate too much for this frame
571                     * size */
572                    framesize_factor  = dbytes;
573                    framesize_factor /= rc->avg_length[s->type-1];
574    
575          for (i=0; i<rc->num_frames; i++) {                  /* Treat only the overflow part concerned by this frame type and size */
576                  stat_t * s = &rc->stats[i];                  overflow *= frametype_factor;
577                  int len;  #if 0
578                    /* Leave this one alone, as it impacts badly on quality */
579                    overflow *= framesize_factor;
580    #endif
581    
582          if (s->zone_mode == XVID_ZONE_QUANT) {                  /* Apply the overflow strength imposed by the user */
583              s->scaled_length = s->length;                  overflow *= (rc->param.overflow_control_strength/100.0f);
         }else {  
                     len = (int)((double)s->length * scaler * s->weight / rc->avg_weight);  
                     if (len < min_size[s->type-1]) {            /* force frame size */  
                             s->scaled_length = min_size[s->type-1];  
                             target -= s->scaled_length;  
                             pass1_length -= s->length;  
584                      }else{                      }else{
585                              s->scaled_length = 0;                  /* no negative overflow applied in IFrames because:
586                      }                   *  - their role is important as they're references for P/BFrames.
587          }                   *  - there aren't much in typical sequences, so if an IFrame overflows too
588          }                   *    much, this overflow may impact the next IFrame too much and generate
589                     *    a sequence of poor quality frames */
590      scaler = (double)target / (double)pass1_length;                  overflow = 0;
     if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {  
                 DPRINTF(XVID_DEBUG_RC,"undersize warning\n");  
                 scaler = 1.0;  
591          }          }
592    
593          DPRINTF(XVID_DEBUG_RC, "target=%i, tot_length=%i, scaler=%f\n", (int)target, (int)pass1_length, scaler);          /* Make sure we are not trying to compensate more overflow than we even have */
594            if (fabs(overflow) > fabs(rc->overflow))
595          for (i=0; i<rc->num_frames; i++) {                  overflow = rc->overflow;
                 stat_t * s = &rc->stats[i];  
596    
597                  if (s->scaled_length==0) {      /* ignore frame with forced frame sizes */          /* Make sure the overflow doesn't make the frame size to get out of the range
598                          s->scaled_length = (int)((double)s->length * scaler * s->weight / rc->avg_weight);           * [-max_degradation..+max_improvment] */
599                  }          if (overflow > dbytes*rc->param.max_overflow_improvement / 100) {
600                    if(overflow <= dbytes)
601                            dbytes += dbytes * rc->param.max_overflow_improvement / 100;
602                    else
603                            dbytes += overflow * rc->param.max_overflow_improvement / 100;
604            } else if (overflow < - dbytes * rc->param.max_overflow_degradation / 100) {
605                    dbytes -= dbytes * rc->param.max_overflow_degradation / 100;
606            } else {
607                    dbytes += overflow;
608          }          }
609    
610            /*-------------------------------------------------------------------------
611             * Frame bit allocation last part:
612             *
613             * Cap frame length so we don't reach neither bigger frame sizes than first
614             * pass nor smaller than the allowed minimum.
615             *-----------------------------------------------------------------------*/
616    
617    #ifdef PASS_SMALLER
618            if (dbytes > s->length) {
619                    dbytes = s->length;
620            } else
621                    if (dbytes < rc->min_length[s->type-1]) {
622                    dbytes = rc->min_length[s->type-1];
623            } else if (dbytes > rc->max_length) {
624                    /* ToDo: this condition is always wrong as max_length == maximum frame
625                     * length of first pass, so the first condition already caps the frame
626                     * size... */
627                    capped_to_max_framesize = 1;
628                    dbytes = rc->max_length;
629                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- frame:%d Capped to maximum frame size\n",
630                                    data->frame_num);
631  }  }
632    #endif
633            /*------------------------------------------------------------------------
634             * Desired frame length <-> quantizer mapping
635             *-----------------------------------------------------------------------*/
636    
637    #ifdef BQUANT_PRESCALE
638            /* For bframes we prescale the quantizer to avoid too high quant scaling */
639            if(s->type == XVID_TYPE_BVOP) {
640    
641                    twopass_stat_t *b_ref = s;
642    
643                    /* Find the reference frame */
644                    while(b_ref != &rc->stats[0] && b_ref->type == XVID_TYPE_BVOP)
645                            b_ref--;
646    
647                    /* Compute the original quant */
648                    s->quant  = 2*(100*s->quant - data->bquant_offset);
649                    s->quant += data->bquant_ratio - 1; /* to avoid rounding issues */
650                    s->quant  = s->quant/data->bquant_ratio - b_ref->quant;
651            }
652    #endif
653    
654  void pre_process1(rc_2pass2_t * rc)          /* Don't laugh at this very 'simple' quant<->size relationship, it
655  {           * proves to be acurate enough for our algorithm */
656      int i;          scaled_quant = (double)s->quant*(double)s->length/(double)dbytes;
657      double total1, total2;  
658      uint64_t ivop_boost_total;  #ifdef COMPENSATE_FORMULA
659            /* We know xvidcore will apply the bframe formula again, so we compensate
660             * it right now to make sure we would not apply it twice */
661            if(s->type == XVID_TYPE_BVOP) {
662    
663      ivop_boost_total = 0;                  twopass_stat_t *b_ref = s;
     rc->curve_comp_error = 0;  
664    
665      for (i=0; i<3; i++) {                  /* Find the reference frame */
666          rc->tot_scaled_length[i] = 0;                  while(b_ref != &rc->stats[0] && b_ref->type == XVID_TYPE_BVOP)
667                            b_ref--;
668    
669                    /* Compute the quant it would be if the core did not apply the bframe
670                     * formula */
671                    scaled_quant  = 100*scaled_quant - data->bquant_offset;
672                    scaled_quant += data->bquant_ratio - 1; /* to avoid rouding issues */
673                    scaled_quant /= data->bquant_ratio;
674      }      }
675    #endif
676    
677      for (i=0; i<rc->num_frames; i++) {          /* Quantizer has been scaled using floating point operations/results, we
678          stat_t * s = &rc->stats[i];           * must cast it to integer */
679            data->quant = (int)scaled_quant;
680    
681          rc->tot_scaled_length[s->type-1] += s->scaled_length;          /* Let's clip the computed quantizer, if needed */
682            if (data->quant < 1) {
683                    data->quant = 1;
684            } else if (data->quant > 31) {
685                    data->quant = 31;
686            } else {
687    
688          if (s->type == XVID_TYPE_IVOP) {                  /* The frame quantizer has not been clipped, this appears to be a good
689              ivop_boost_total += s->scaled_length * rc->param.keyframe_boost / 100;                   * computed quantizer, do not loose quantizer decimal part that we
690                     * accumulate for later reuse when its sum represents a complete
691                     * unit. */
692                    rc->quant_error[s->type-1][data->quant] += scaled_quant - (double)data->quant;
693    
694                    if (rc->quant_error[s->type-1][data->quant] >= 1.0) {
695                            rc->quant_error[s->type-1][data->quant] -= 1.0;
696                            data->quant++;
697                    } else if (rc->quant_error[s->type-1][data->quant] <= -1.0) {
698                            rc->quant_error[s->type-1][data->quant] += 1.0;
699                            data->quant--;
700          }          }
701      }      }
702    
703      rc->movie_curve = ((double)(rc->tot_scaled_length[XVID_TYPE_PVOP-1] + rc->tot_scaled_length[XVID_TYPE_BVOP-1] + ivop_boost_total) /          /* Now we have a computed quant that is in the right quante range, with a
704                                          (rc->tot_scaled_length[XVID_TYPE_PVOP-1] + rc->tot_scaled_length[XVID_TYPE_BVOP-1]));           * possible +1 correction due to cumulated error. We can now safely clip
705             * the quantizer again with user's quant ranges. "Safely" means the Rate
706             * Control could learn more about this quantizer, this knowledge is useful
707             * for future frames even if it this quantizer won't be really used atm,
708             * that's why we don't perform this clipping earlier. */
709            if (data->quant < data->min_quant[s->type-1]) {
710                    data->quant = data->min_quant[s->type-1];
711            } else if (data->quant > data->max_quant[s->type-1]) {
712                    data->quant = data->max_quant[s->type-1];
713            }
714    
715      for(i=0; i<3; i++) {          /* To avoid big quality jumps from frame to frame, we apply a "security"
716          if (rc->count[i] == 0 || rc->movie_curve == 0) {           * rule that makes |last_quant - new_quant| <= 2. This rule only applies
717              rc->avg_length[i] = 1;           * to predicted frames (P and B) */
718          }else{          if (s->type != XVID_TYPE_IVOP && rc->last_quant[s->type-1] && capped_to_max_framesize == 0) {
719              rc->avg_length[i] = rc->tot_scaled_length[i] / rc->count[i] / rc->movie_curve;  
720                    if (data->quant > rc->last_quant[s->type-1] + 2) {
721                            data->quant = rc->last_quant[s->type-1] + 2;
722                            DPRINTF(XVID_DEBUG_RC,
723                                            "[xvid rc] -- frame %d p/b-frame quantizer prevented from rising too steeply\n",
724                                            data->frame_num);
725                    }
726                    if (data->quant < rc->last_quant[s->type-1] - 2) {
727                            data->quant = rc->last_quant[s->type-1] - 2;
728                            DPRINTF(XVID_DEBUG_RC,
729                                            "[xvid rc] -- frame:%d p/b-frame quantizer prevented from falling too steeply\n",
730                                            data->frame_num);
731          }          }
732      }      }
733    
734      /* alt curve stuff here */          /* We don't want to pollute the RC histerisis when our computed quant has
735             * been computed from a capped frame size */
736            if (capped_to_max_framesize == 0)
737                    rc->last_quant[s->type-1] = data->quant;
738    
739      if (rc->param.use_alt_curve) {          /* Don't forget to force 1st pass frame type ;-) */
740          const double avg_pvop = rc->avg_length[XVID_TYPE_PVOP-1];          data->type = s->type;
         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];  
741    
742                  rc->alt_curve_low = avg_pvop - avg_pvop * (double)rc->param.alt_curve_low_dist / 100.0;          return 0;
743                  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;  
744    
745          if (rc->param.alt_curve_use_auto) {  /*----------------------------------------------------------------------------
746              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);  
747    
748                                  if (rc->param.alt_curve_min_rel_qual < 20)  static int
749                                          rc->param.alt_curve_min_rel_qual = 20;  rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)
750              }else{  {
751                                  rc->param.alt_curve_min_rel_qual = 100;          const char frame_type[4] = { 'i', 'p', 'b', 's'};
752              }          twopass_stat_t * s = &rc->stats[data->frame_num];
         }  
                 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;  
753    
754          if (rc->param.alt_curve_low_dist > 100) {          /* Insufficent stats data */
755                          switch(rc->param.alt_curve_type) {          if (data->frame_num >= rc->num_frames)
756              case XVID_CURVE_SINE: // Sine Curve (high aggressiveness)                  return 0;
                                 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)));  
                         }  
                 }  
     }  
     /* --- */  
757    
758            /* Update the quantizer counter */
759            rc->quant_count[s->type-1][data->quant]++;
760    
761      total1=total2=0;          /* Update the frame type overflow */
762      for (i=0; i<rc->num_frames; i++) {          if (data->type == XVID_TYPE_IVOP) {
763          stat_t * s = &rc->stats[i];                  int kfdiff = 0;
764    
765          if (s->type != XVID_TYPE_IVOP) {                  if(rc->KF_idx != rc->num_frames -1) {
766              double dbytes,dbytes2;                          kfdiff  = rc->keyframe_locations[rc->KF_idx+1];
767                            kfdiff -= rc->keyframe_locations[rc->KF_idx];
768                    }
769    
770              dbytes = s->scaled_length / rc->movie_curve;                  /* Flush Keyframe overflow accumulator */
771              dbytes2 = 0; /* XXX: warning */                  rc->overflow += rc->KFoverflow;
             total1 += dbytes;  
             if (s->type == XVID_TYPE_BVOP)  
                 dbytes *= rc->avg_length[XVID_TYPE_PVOP-1] / rc->avg_length[XVID_TYPE_BVOP-1];  
772    
773              if (rc->param.use_alt_curve) {                  /* Store the frame overflow to the keyframe accumulator */
774                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                  rc->KFoverflow = s->desired_length - data->length;
775    
776                      if (dbytes >= rc->alt_curve_high) {                  if (kfdiff > 1) {
777                                                  dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev);                          /* Non-consecutive keyframes case:
778                             * We can then divide this total keyframe overflow into equal parts
779                             * that we will distribute into regular overflow at each frame
780                             * between the sequence bounded by two IFrames */
781                            rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);
782                      }else{                      }else{
783                                                  switch(rc->param.alt_curve_type) {                          /* Consecutive keyframes case:
784                          case XVID_CURVE_SINE :                           * Flush immediatly the keyframe overflow and reset keyframe
785                                                      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)));                           * overflow */
786                                                          break;                          rc->overflow += rc->KFoverflow;
787                          case XVID_CURVE_LINEAR :                          rc->KFoverflow = 0;
788                                                      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);                          rc->KFoverflow_partial = 0;
                                                         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))));  
                                                 }  
789                                          }                                          }
790                    rc->KF_idx++;
791                  }else{                  }else{
792                      if (dbytes <= rc->alt_curve_low) {                  /* Accumulate the frame overflow */
793                                                  dbytes2 = dbytes;                  rc->overflow += s->desired_length - data->length;
                     }else{  
                                                 switch(rc->param.alt_curve_type) {  
                                                 case XVID_CURVE_SINE :  
                                                     dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * sin(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_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))));  
                                                 }  
                                         }  
794    
795                    /* Distribute part of the keyframe overflow */
796                    rc->overflow += rc->KFoverflow_partial;
797    
798                    /* Don't forget to substract that same amount from the total keyframe
799                     * overflow */
800                    rc->KFoverflow -= rc->KFoverflow_partial;
801                  }                  }
802    
803            rc->overflow += (s->error = s->desired_length - data->length);
804            rc->real_total += data->length;
805    
806              }else{          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",
807                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                          data->frame_num,
808                      dbytes2=((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_high / 100.0);                          frame_type[data->type-1],
809                  }else{                          data->quant,
810                                  dbytes2 = ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_low / 100.0);                          s->length,
811                  }                          s->scaled_length,
812              }                          s->desired_length,
813                            s->desired_length - s->error,
814                            -s->error,
815                            rc->overflow);
816    
817              if (s->type == XVID_TYPE_BVOP) {          return(0);
                             dbytes2 *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
                             if (dbytes2 < rc->min_length[XVID_TYPE_BVOP-1])  
                                     dbytes2 = rc->min_length[XVID_TYPE_BVOP-1];  
             }else{  
                             if (dbytes2 < rc->min_length[XVID_TYPE_PVOP-1])  
                                     dbytes2 = rc->min_length[XVID_TYPE_PVOP-1];  
             }  
             total2 += dbytes2;  
         }  
818      }      }
819    
820      rc->curve_comp_scale = total1 / total2;  /*****************************************************************************
821     * Helper functions definition
822     ****************************************************************************/
823    
824      if (!rc->param.use_alt_curve) {  /* Default buffer size for reading lines */
825          DPRINTF(XVID_DEBUG_RC, "middle frame size for asymmetric curve compression: %i\n",  #define BUF_SZ   1024
             (int)(rc->avg_length[XVID_TYPE_PVOP-1] * rc->curve_comp_scale));  
     }  
826    
827      if (rc->param.use_alt_curve) {  /* Helper functions for reading/parsing the stats file */
828          int bonus_bias = rc->param.alt_curve_bonus_bias;  static char *skipspaces(char *string);
829          int oldquant = 1;  static int iscomment(char *string);
830    static char *readline(FILE *f);
831    
832    /* This function counts the number of frame entries in the stats file
833     * It also counts the number of I Frames */
834    static int
835    statsfile_count_frames(rc_2pass2_t * rc, char * filename)
836    {
837            FILE * f;
838            char *line;
839            int lines;
840    
841              if (rc->param.alt_curve_use_auto_bonus_bias)          rc->num_frames = 0;
842                      bonus_bias = rc->param.alt_curve_min_rel_qual;          rc->num_keyframes = 0;
843    
844              rc->alt_curve_curve_bias_bonus = (total1 - total2) * (double)bonus_bias / 100.0 / (double)(rc->num_frames /* - credits_frames */ - rc->num_keyframes);          if ((f = fopen(filename, "rb")) == NULL)
845              rc->curve_comp_scale = ((total1 - total2) * (1.0 - (double)bonus_bias / 100.0) + total2) / total2;                  return(-1);
846    
847            lines = 0;
848            while ((line = readline(f)) != NULL) {
849    
850          /* special info for alt curve:  bias bonus and quantizer thresholds */                  char *ptr;
851                    char type;
852                    int fields;
853    
854                  DPRINTF(XVID_DEBUG_RC, "avg scaled framesize:%i", (int)rc->avg_length[XVID_TYPE_PVOP-1]);                  lines++;
                 DPRINTF(XVID_DEBUG_RC, "bias bonus:%i bytes", (int)rc->alt_curve_curve_bias_bonus);  
855    
856                  for (i=1; i <= (int)(rc->alt_curve_high*2)+1; i++) {                  /* We skip spaces */
857              double curve_temp, dbytes;                  ptr = skipspaces(line);
             int newquant;  
858    
859              dbytes = i;                  /* Skip coment lines or empty lines */
860                          if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                  if(iscomment(ptr) || *ptr == '\0') {
861                  if (dbytes >= rc->alt_curve_high) {                          free(line);
862                                          curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev);                          continue;
                 }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))));  
                                         }  
                                 }  
863                          }                          }
864    
865                          if (rc->movie_curve > 1.0)                  /* Read the stat line from buffer */
866                                  dbytes *= rc->movie_curve;                  fields = sscanf(ptr, "%c", &type);
867    
868                          newquant = (int)(dbytes * 2.0 / (curve_temp * rc->curve_comp_scale + rc->alt_curve_curve_bias_bonus));                  /* Valid stats files have at least 7 fields */
869                          if (newquant > 1) {                  if (fields == 1) {
870                                  if (newquant != oldquant) {                          switch(type) {
871                      int percent = (int)((i - rc->avg_length[XVID_TYPE_PVOP-1]) * 100.0 / rc->avg_length[XVID_TYPE_PVOP-1]);                          case 'i':
872                                          oldquant = newquant;                          case 'I':
873                                          DPRINTF(XVID_DEBUG_RC, "quant:%i threshold at %i : %i percent", newquant, i, percent);                                  rc->num_keyframes++;
874                                  }                          case 'p':
875                            case 'P':
876                            case 'b':
877                            case 'B':
878                            case 's':
879                            case 'S':
880                                    rc->num_frames++;
881                                    break;
882                            default:
883                                    DPRINTF(XVID_DEBUG_RC,
884                                                    "[xvid rc] -- WARNING: L%d unknown frame type used (%c).\n",
885                                                    lines, type);
886                          }                          }
887                    } else {
888                                    DPRINTF(XVID_DEBUG_RC,
889                                                    "[xvid rc] -- WARNING: L%d misses some stat fields (%d).\n",
890                                                    lines, 7-fields);
891                  }                  }
892    
893                    /* Free the line buffer */
894                    free(line);
895      }      }
896    
897      rc->overflow = 0;          /* We are done with the file */
898      rc->KFoverflow = 0;          fclose(f);
899      rc->KFoverflow_partial = 0;  
900      rc->KF_idx = 1;          return(0);
901  }  }
902    
903    /* open stats file(s) and read into rc->stats array */
904    static int
905    statsfile_load(rc_2pass2_t *rc, char * filename)
906    {
907            FILE * f;
908            int processed_entries;
909    
910            /* Opens the file */
911            if ((f = fopen(filename, "rb"))==NULL)
912                    return(-1);
913    
914            processed_entries = 0;
915            while(processed_entries < rc->num_frames) {
916                    char type;
917                    int fields;
918                    twopass_stat_t * s = &rc->stats[processed_entries];
919                    char *line, *ptr;
920    
921  static int rc_2pass2_create(xvid_plg_create_t * create, rc_2pass2_t ** handle)                  /* Read the line from the file */
922  {                  if((line = readline(f)) == NULL)
923      xvid_plugin_2pass2_t * param = (xvid_plugin_2pass2_t *)create->param;                          break;
     rc_2pass2_t * rc;  
     int i;  
924    
925      rc = malloc(sizeof(rc_2pass2_t));                  /* We skip spaces */
926      if (rc == NULL)                  ptr = skipspaces(line);
         return XVID_ERR_MEMORY;  
927    
928      rc->param = *param;                  /* Skip comment lines or empty lines */
929                    if(iscomment(ptr) || *ptr == '\0') {
930                            free(line);
931                            continue;
932                    }
933    
934      if (rc->param.keyframe_boost <= 0) rc->param.keyframe_boost = 0;                  /* Reset this field that is optional */
935      if (rc->param.payback_method <= 0) rc->param.payback_method = XVID_PAYBACK_PROP;                  s->scaled_length = 0;
     if (rc->param.bitrate_payback_delay <= 0) rc->param.bitrate_payback_delay = 250;  
     if (rc->param.curve_compression_high <= 0) rc->param.curve_compression_high = 0;  
     if (rc->param.curve_compression_low <= 0) rc->param.curve_compression_low = 0;  
     if (rc->param.max_overflow_improvement <= 0) rc->param.max_overflow_improvement = 60;  
     if (rc->param.max_overflow_degradation <= 0) rc->param.max_overflow_degradation = 60;  
   
     if (rc->param.use_alt_curve <= 0) rc->param.use_alt_curve = 0;  
     if (rc->param.alt_curve_high_dist <= 0) rc->param.alt_curve_high_dist = 500;  
     if (rc->param.alt_curve_low_dist <= 0) rc->param.alt_curve_low_dist = 90;  
     if (rc->param.alt_curve_use_auto <= 0) rc->param.alt_curve_use_auto = 1;  
     if (rc->param.alt_curve_auto_str <= 0) rc->param.alt_curve_auto_str = 30;  
     if (rc->param.alt_curve_type <= 0) rc->param.alt_curve_type = XVID_CURVE_LINEAR;  
     if (rc->param.alt_curve_min_rel_qual <= 0) rc->param.alt_curve_min_rel_qual = 50;  
     if (rc->param.alt_curve_use_auto_bonus_bias <= 0) rc->param.alt_curve_use_auto_bonus_bias = 1;  
     if (rc->param.alt_curve_bonus_bias <= 0) rc->param.alt_curve_bonus_bias = 50;  
   
     if (rc->param.kftreshold <= 0) rc->param.kftreshold = 10;  
     if (rc->param.kfreduction <= 0) rc->param.kfreduction = 20;  
     if (rc->param.min_key_interval <= 0) rc->param.min_key_interval = 300;  
936    
937      if (!det_stats_length(rc, param->filename)){                  /* Convert the fields */
938          DPRINTF(XVID_DEBUG_RC,"fopen %s failed\n", param->filename);                  fields = sscanf(ptr,
939          free(rc);                                                  "%c %d %d %d %d %d %d %d\n",
940          return XVID_ERR_FAIL;                                                  &type,
941                                                    &s->quant,
942                                                    &s->blks[0], &s->blks[1], &s->blks[2],
943                                                    &s->length, &s->invariant /* not really yet */,
944                                                    &s->scaled_length);
945    
946                    /* Free line buffer, we don't need it anymore */
947                    free(line);
948    
949                    /* Fail silently, this has probably been warned in
950                     * statsfile_count_frames */
951                    if(fields != 7 && fields != 8)
952                            continue;
953    
954                    /* Convert frame type and compute the invariant length part */
955                    switch(type) {
956                    case 'i':
957                    case 'I':
958                            s->type = XVID_TYPE_IVOP;
959                            s->invariant /= INVARIANT_HEADER_PART_IVOP;
960                            break;
961                    case 'p':
962                    case 'P':
963                    case 's':
964                    case 'S':
965                            s->type = XVID_TYPE_PVOP;
966                            s->invariant /= INVARIANT_HEADER_PART_PVOP;
967                            break;
968                    case 'b':
969                    case 'B':
970                            s->type = XVID_TYPE_BVOP;
971                            s->invariant /= INVARIANT_HEADER_PART_BVOP;
972                            break;
973                    default:
974                            /* Same as before, fail silently */
975                            continue;
976      }      }
977    
978      if ((rc->stats = malloc(rc->num_frames * sizeof(stat_t))) == NULL) {                  /* Ok it seems it's been processed correctly */
979          free(rc);                  processed_entries++;
         return XVID_ERR_MEMORY;  
980      }      }
981    
982      /* XXX: do we need an addition location */          /* Close the file */
983      if ((rc->keyframe_locations = malloc((rc->num_keyframes + 1) * sizeof(int))) == NULL) {          fclose(f);
         free(rc->stats);  
         free(rc);  
         return XVID_ERR_MEMORY;  
     }  
984    
985      if (!load_stats(rc, param->filename)) {          return(0);
         DPRINTF(XVID_DEBUG_RC,"fopen %s failed\n", param->filename);  
         free(rc->keyframe_locations);  
         free(rc->stats);  
         free(rc);  
         return XVID_ERR_FAIL;  
986      }      }
987    
988      /* pre-process our stats */  /* pre-process the statistics data
989     * - for each type, count, tot_length, min_length, max_length
990     * - set keyframes_locations, tot_prescaled */
991    static void
992    first_pass_stats_prepare_data(rc_2pass2_t * rc)
993    {
994            int i,j;
995    
996          if (rc->num_frames  < create->fbase/create->fincr) {          /* *rc fields initialization
997                  rc->target = rc->param.bitrate / 8;     /* one second */           * NB: INT_MAX and INT_MIN are used in order to be immediately replaced
998          }else{           *     with real values of the 1pass */
999                  rc->target = (rc->param.bitrate * rc->num_frames * create->fincr) / (create->fbase * 8);          for (i=0; i<3; i++) {
1000                    rc->count[i]=0;
1001                    rc->tot_length[i] = 0;
1002                    rc->tot_invariant[i] = 0;
1003                    rc->min_length[i] = INT_MAX;
1004          }          }
1005    
1006      DPRINTF(XVID_DEBUG_RC, "rc->target : %i\n", rc->target);          rc->max_length = INT_MIN;
1007            rc->tot_weighted = 0;
         rc->target -= rc->num_frames*24;        /* avi file header */  
1008    
1009            /* Loop through all frames and find/compute all the stuff this function
1010             * is supposed to do */
1011            for (i=j=0; i<rc->num_frames; i++) {
1012                    twopass_stat_t * s = &rc->stats[i];
1013    
1014          pre_process0(rc);                  rc->count[s->type-1]++;
1015                    rc->tot_length[s->type-1] += s->length;
1016                    rc->tot_invariant[s->type-1] += s->invariant;
1017                    if (s->zone_mode != XVID_ZONE_QUANT)
1018                            rc->tot_weighted += (int)(s->weight*(s->length - s->invariant));
1019    
1020          if (rc->param.bitrate) {                  if (s->length < rc->min_length[s->type-1]) {
1021          zone_process(rc, create);                          rc->min_length[s->type-1] = s->length;
                 internal_scale(rc);  
     }else{  
         /* external scaler: ignore zone */  
         for (i=0;i<rc->num_frames;i++) {  
             rc->stats[i].zone_mode = XVID_ZONE_WEIGHT;  
             rc->stats[i].weight = 1.0;  
         }  
         rc->avg_weight = 1.0;  
         rc->tot_quant = 0;  
1022      }      }
         pre_process1(rc);  
1023    
1024      for (i=0; i<32;i++) {                  if (s->length > rc->max_length) {
1025          rc->pquant_error[i] = 0;                          rc->max_length = s->length;
         rc->bquant_error[i] = 0;  
         rc->quant_count[i] = 0;  
1026      }      }
1027    
1028      rc->fq_error = 0;                  if (s->type == XVID_TYPE_IVOP) {
1029                            rc->keyframe_locations[j] = i;
1030      *handle = rc;                          j++;
         return(0);  
1031  }  }
   
   
 static int rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy)  
 {  
     free(rc->keyframe_locations);  
     free(rc->stats);  
         free(rc);  
         return(0);  
1032  }  }
1033    
1034            /* NB:
1035             * The "per sequence" overflow system considers a natural sequence to be
1036             * formed by all frames between two iframes, so if we want to make sure
1037             * the system does not go nuts during last sequence, we force the last
1038             * frame to appear in the keyframe locations array. */
1039            rc->keyframe_locations[j] = i;
1040    
1041            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Min 1st pass IFrame length: %d\n", rc->min_length[0]);
1042            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Min 1st pass PFrame length: %d\n", rc->min_length[1]);
1043            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Min 1st pass BFrame length: %d\n", rc->min_length[2]);
1044    }
1045    
1046  static int rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)  /* calculate zone weight "center" */
1047    static void
1048    zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)
1049  {  {
1050      stat_t * s = &rc->stats[data->frame_num];          int i,j;
1051      int overflow;          int n = 0;
     int desired;  
     double dbytes;  
     double curve_temp;  
     int capped_to_max_framesize = 0;  
   
     if (data->quant <= 0) {  
   
         if (s->zone_mode == XVID_ZONE_QUANT) {  
   
             rc->fq_error += s->weight;  
             data->quant = (int)rc->fq_error;  
             rc->fq_error -= data->quant;  
   
             s->desired_length = s->length;  
1052    
1053          }else { /* XVID_ZONE_WEIGHT */          rc->tot_quant = 0;
1054            rc->tot_quant_invariant = 0;
1055    
1056              if (data->frame_num >= rc->num_frames) {          if (create->num_zones == 0) {
1057                  /* insufficent stats data */                  for (j = 0; j < rc->num_frames; j++) {
1058                  return 0;                          rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1059                            rc->stats[j].weight = 1.0;
1060              }              }
1061                    n += rc->num_frames;
             overflow = rc->overflow / 8;        /* XXX: why by 8 */  
   
             if (s->type == XVID_TYPE_IVOP) {        /* XXX: why */  
                 overflow = 0;  
1062              }              }
1063    
             desired = s->scaled_length;  
1064    
1065              dbytes = desired;          for(i=0; i < create->num_zones; i++) {
             if (s->type == XVID_TYPE_IVOP) {  
                 dbytes += desired * rc->param.keyframe_boost / 100;  
             }  
             dbytes /= rc->movie_curve;  
1066    
1067              if (s->type == XVID_TYPE_BVOP) {                  int next = (i+1<create->num_zones) ? create->zones[i+1].frame : rc->num_frames;
                 dbytes *= rc->avg_length[XVID_TYPE_PVOP-1] / rc->avg_length[XVID_TYPE_BVOP-1];  
             }  
1068    
1069              if (rc->param.payback_method == XVID_PAYBACK_BIAS) {                  /* Zero weight make no sense */
1070                  desired =(int)(rc->curve_comp_error / rc->param.bitrate_payback_delay);                  if (create->zones[i].increment == 0) create->zones[i].increment = 1;
1071              }else{                  /* And obviously an undetermined infinite makes even less sense */
1072                          //printf("desired=%i, dbytes=%i\n", desired,dbytes);                  if (create->zones[i].base == 0) create->zones[i].base = 1;
                         desired = (int)(rc->curve_comp_error * dbytes /  
                                 rc->avg_length[XVID_TYPE_PVOP-1] / rc->param.bitrate_payback_delay);  
                         //printf("desired=%i\n", desired);  
1073    
1074                          if (labs(desired) > fabs(rc->curve_comp_error)) {                  if (i==0 && create->zones[i].frame > 0) {
1075                                  desired = (int)rc->curve_comp_error;                          for (j = 0; j < create->zones[i].frame && j < rc->num_frames; j++) {
1076                                    rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1077                                    rc->stats[j].weight = 1.0;
1078                          }                          }
1079                            n += create->zones[i].frame;
1080              }              }
1081    
1082              rc->curve_comp_error -= desired;                  if (create->zones[i].mode == XVID_ZONE_WEIGHT) {
1083                            for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {
1084              /* alt curve */                                  rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1085                                    rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;
             curve_temp = 0; /* XXX: warning */  
   
             if (rc->param.use_alt_curve) {  
                 if (s->type != XVID_TYPE_IVOP)  {  
                     if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {  
                         if (dbytes >= rc->alt_curve_high) {  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev);  
                         }else{  
                             switch(rc->param.alt_curve_type) {  
                                                 case XVID_CURVE_SINE :  
                                                     curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * sin(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_high_diff)));  
                                                         break;  
                                                 case XVID_CURVE_LINEAR :  
                                                     curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) / rc->alt_curve_high_diff);  
                                                         break;  
                                                 case XVID_CURVE_COSINE :  
                                                     curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_high_diff))));  
1086                                                  }                                                  }
1087                            next -= create->zones[i].frame;
1088                            n += next;
1089                    } else{  /* XVID_ZONE_QUANT */
1090                            for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {
1091                                    rc->stats[j].zone_mode = XVID_ZONE_QUANT;
1092                                    rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;
1093                                    rc->tot_quant += rc->stats[j].length;
1094                                    rc->tot_quant_invariant += rc->stats[j].invariant;
1095                                          }                                          }
                                 }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))));  
1096                              }                              }
1097                                          }                                          }
1098                                  }                                  }
                                 if (s->type == XVID_TYPE_BVOP)  
                                         curve_temp *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
   
                                 curve_temp = curve_temp * rc->curve_comp_scale + rc->alt_curve_curve_bias_bonus;  
1099    
                                 desired += ((int)curve_temp);  
                                 rc->curve_comp_error += curve_temp - (int)curve_temp;  
                         }else{  
                                 if (s->type == XVID_TYPE_BVOP)  
                                         dbytes *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
1100    
1101                                  desired += ((int)dbytes);  /* scale the curve */
1102                                  rc->curve_comp_error += dbytes - (int)dbytes;  static void
1103                          }  first_pass_scale_curve_internal(rc_2pass2_t *rc)
1104    {
1105            int64_t target;
1106            int64_t total_invariant;
1107            double scaler;
1108            int i, num_MBs;
1109    
1110              }else if ((rc->param.curve_compression_high + rc->param.curve_compression_low) &&   s->type != XVID_TYPE_IVOP) {          /* We only scale texture data ! */
1111            total_invariant  = rc->tot_invariant[XVID_TYPE_IVOP-1];
1112            total_invariant += rc->tot_invariant[XVID_TYPE_PVOP-1];
1113            total_invariant += rc->tot_invariant[XVID_TYPE_BVOP-1];
1114            /* don't forget to substract header bytes used in quant zones, otherwise we
1115             * counting them twice */
1116            total_invariant -= rc->tot_quant_invariant;
1117    
1118            /* We remove the bytes used by the fixed quantizer zones during first pass
1119             * with the same quants, so we know very precisely how much that
1120             * represents */
1121            target  = rc->target;
1122            target -= rc->tot_quant;
1123    
1124            /* Let's compute a linear scaler in order to perform curve scaling */
1125            scaler = (double)(target - total_invariant) / (double)(rc->tot_weighted);
1126    
1127            /* Compute min frame lengths (for each frame type) according to the number
1128             * of MBs. We sum all block type counters of frame 0, this gives us the
1129             * number of MBs.
1130             *
1131             * We compare these hardcoded values with observed values in first pass
1132             * (determined in pre_process0).Then we keep the real minimum. */
1133    
1134                  curve_temp = rc->curve_comp_scale;          /* Number of MBs */
1135                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {          num_MBs  = rc->stats[0].blks[0];
1136                      curve_temp *= ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_high / 100.0);          num_MBs += rc->stats[0].blks[1];
1137                  } else {          num_MBs += rc->stats[0].blks[2];
1138                      curve_temp *= ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_low / 100.0);  
1139                  }          /* Minimum for I frames */
1140            if(rc->min_length[XVID_TYPE_IVOP-1] > ((num_MBs*22) + 240) / 8)
1141                    rc->min_length[XVID_TYPE_IVOP-1] = ((num_MBs*22) + 240) / 8;
1142    
1143            /* Minimum for P/S frames */
1144            if(rc->min_length[XVID_TYPE_PVOP-1] > ((num_MBs) + 88)  / 8)
1145                    rc->min_length[XVID_TYPE_PVOP-1] = ((num_MBs) + 88)  / 8;
1146    
1147            /* Minimum for B frames */
1148            if(rc->min_length[XVID_TYPE_BVOP-1] > 8)
1149                    rc->min_length[XVID_TYPE_BVOP-1] = 8;
1150    
1151                  if (s->type == XVID_TYPE_BVOP){          /* Perform an initial scale pass.
1152                      curve_temp *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];           *
1153                  }           * If a frame size is scaled underneath our hardcoded minimums, then we
1154             * force the frame size to the minimum, and deduct the original & scaled
1155             * frame length from the original and target total lengths */
1156            for (i=0; i<rc->num_frames; i++) {
1157                    twopass_stat_t * s = &rc->stats[i];
1158                    int len;
1159    
1160                  desired += (int)curve_temp;                  /* No need to scale frame length for which a specific quantizer is
1161                  rc->curve_comp_error += curve_temp - (int)curve_temp;                   * specified thanks to zones */
1162              }else{                  if (s->zone_mode == XVID_ZONE_QUANT) {
1163                  if (s->type == XVID_TYPE_BVOP){                          s->scaled_length = s->length;
1164                                  dbytes *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];                          continue;
1165                  }                  }
1166    
1167                          desired += (int)dbytes;                  /* Compute the scaled length -- only non invariant data length is scaled */
1168                          rc->curve_comp_error += dbytes - (int)dbytes;                  len = s->invariant + (int)((double)(s->length-s->invariant) * scaler * s->weight);
             }  
1169    
1170                    /* Compare with the computed minimum */
1171                    if (len < rc->min_length[s->type-1]) {
1172                            /* This is a 'forced size' frame, set its frame size to the
1173                             * computed minimum */
1174                            s->scaled_length = rc->min_length[s->type-1];
1175    
1176                  if (desired > s->length) {  /* if desired length exceeds the pass1 length.. */                          /* Remove both scaled and original size from their respective
1177                          rc->curve_comp_error += desired - s->length;                           * total counters, as we prepare a second pass for 'regular'
1178                          desired = s->length;                           * frames */
1179                            target -= s->scaled_length;
1180                  }else{                  }else{
1181                  if (desired < rc->min_length[s->type-1]) {                          /* Do nothing for now, we'll scale this later */
1182                      if (s->type == XVID_TYPE_IVOP){                          s->scaled_length = 0;
                         rc->curve_comp_error -= rc->min_length[XVID_TYPE_IVOP-1] - desired;  
                     }  
                     desired = rc->min_length[s->type-1];  
1183                  }                  }
1184                  }                  }
1185    
1186              s->desired_length = desired;          /* The first pass on data substracted all 'forced size' frames from the
1187             * total counters. Now, it's possible to scale the 'regular' frames. */
1188    
1189              /* if this keyframe is too close to the next, reduce it's byte allotment          /* Scaling factor for 'regular' frames */
1190              XXX: why do we do this after setting the desired length  */          scaler = (double)(target - total_invariant) / (double)(rc->tot_weighted);
1191    
1192                  if (s->type == XVID_TYPE_IVOP) {          /* Do another pass with the new scaler */
1193                          int KFdistance = rc->keyframe_locations[rc->KF_idx] - rc->keyframe_locations[rc->KF_idx - 1];          for (i=0; i<rc->num_frames; i++) {
1194                    twopass_stat_t * s = &rc->stats[i];
                 if (KFdistance < rc->param.kftreshold) {  
1195    
1196                      KFdistance = KFdistance - rc->param.min_key_interval;                  /* Ignore frame with forced frame sizes */
1197                    if (s->scaled_length == 0)
1198                            s->scaled_length = s->invariant + (int)((double)(s->length-s->invariant) * scaler * s->weight);
1199            }
1200    
1201                                  if (KFdistance >= 0) {          /* Job done */
1202                          int KF_min_size;          return;
1203    }
1204    
1205                                          KF_min_size = desired * (100 - rc->param.kfreduction) / 100;  /* Apply all user settings to the scaled curve
1206                                          if (KF_min_size < 1)   * This implies:
1207                                                  KF_min_size = 1;   *   keyframe boosting
1208     *   high/low compression */
1209    static void
1210    scaled_curve_apply_advanced_parameters(rc_2pass2_t * rc)
1211    {
1212            int i;
1213            int64_t ivop_boost_total;
1214    
1215                                          desired = KF_min_size + (desired - KF_min_size) * KFdistance /          /* Reset the rate controller (per frame type) total byte counters */
1216                                                  (rc->param.kftreshold - rc->param.min_key_interval);          for (i=0; i<3; i++) rc->tot_scaled_length[i] = 0;
1217    
1218                                          if (desired < 1)          /* Compute total bytes for each frame type */
1219                                                  desired = 1;          for (i=0; i<rc->num_frames;i++) {
1220                                  }                  twopass_stat_t *s = &rc->stats[i];
1221                          }                  rc->tot_scaled_length[s->type-1] += s->scaled_length;
1222                  }                  }
1223    
1224              overflow = (int)((double)overflow * desired / rc->avg_length[XVID_TYPE_PVOP-1]);          /* First we compute the total amount of bits needed, as being described by
1225             * the scaled distribution. During this pass over the complete stats data,
1226             * we see how much bits two user settings will get/give from/to p&b frames:
1227             *  - keyframe boosting
1228             *  - keyframe distance penalty */
1229            rc->KF_idx = 0;
1230            ivop_boost_total = 0;
1231            for (i=0; i<rc->num_frames; i++) {
1232                    twopass_stat_t * s = &rc->stats[i];
1233    
1234                  // Foxer: reign in overflow with huge frames                  /* Some more work is needed for I frames */
1235                  if (labs(overflow) > labs(rc->overflow)) {                  if (s->type == XVID_TYPE_IVOP) {
1236                          overflow = rc->overflow;                          int ivop_boost;
                 }  
1237    
1238              // Foxer: make sure overflow doesn't run away                          /* Accumulate bytes needed for keyframe boosting */
1239                            ivop_boost = s->scaled_length*rc->param.keyframe_boost/100;
1240    
1241                  if (overflow > desired * rc->param.max_overflow_improvement / 100) {  #if 0 /* ToDo: decide how to apply kfthresholding */
1242                          desired += (overflow <= desired) ? desired * rc->param.max_overflow_improvement / 100 :  #endif
1243                                  overflow * rc->param.max_overflow_improvement / 100;                          /* If the frame size drops under the minimum length, then cap ivop_boost */
1244                  }else if (overflow < desired * rc->param.max_overflow_degradation / -100){                          if (ivop_boost + s->scaled_length < rc->min_length[XVID_TYPE_IVOP-1])
1245                          desired += desired * rc->param.max_overflow_degradation / -100;                                  ivop_boost = rc->min_length[XVID_TYPE_IVOP-1] - s->scaled_length;
                 }else{  
                         desired += overflow;  
                 }  
1246    
1247              if (desired > rc->max_length) {                          /* Accumulate the ivop boost */
1248                          capped_to_max_framesize = 1;                          ivop_boost_total += ivop_boost;
                         desired = rc->max_length;  
                 }  
1249    
1250              // make sure to not scale below the minimum framesize                          /* Don't forget to update the keyframe index */
1251              if (desired < rc->min_length[s->type-1]) {                          rc->KF_idx++;
1252                  desired = rc->min_length[s->type-1];                  }
1253              }              }
1254    
1255            /* Initialize the IBoost tax ratio for P/S/B frames
1256             *
1257             * This ratio has to be applied to p/b/s frames in order to reserve
1258             * additional bits for keyframes (keyframe boosting) or if too much
1259             * keyframe distance is applied, bits retrieved from the keyframes.
1260             *
1261             * ie pb_length *= rc->pb_iboost_tax_ratio;
1262             *
1263             *    gives the ideal length of a p/b frame */
1264    
1265              // very 'simple' quant<->filesize relationship          /* Compute the total length of p/b/s frames (temporary storage into
1266              data->quant= (s->quant * s->length) / desired;           * movie_curve) */
1267            rc->pb_iboost_tax_ratio  = (double)rc->tot_scaled_length[XVID_TYPE_PVOP-1];
1268            rc->pb_iboost_tax_ratio += (double)rc->tot_scaled_length[XVID_TYPE_BVOP-1];
1269    
1270            /* Compute the ratio described above
1271             *     taxed_total = sum(0, n, tax*scaled_length)
1272             * <=> taxed_total = tax.sum(0, n, scaled_length)
1273             * <=> tax = taxed_total / original_total */
1274            rc->pb_iboost_tax_ratio =
1275                    (rc->pb_iboost_tax_ratio - ivop_boost_total) /
1276                    rc->pb_iboost_tax_ratio;
1277    
1278                  if (data->quant < 1) {          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- IFrame boost tax ratio:%.2f\n",
1279                          data->quant = 1;                          rc->pb_iboost_tax_ratio);
             } else if (data->quant > 31) {  
                         data->quant = 31;  
                 }  
                 else if (s->type != XVID_TYPE_IVOP)  
                 {  
                         // Foxer: aid desired quantizer precision by accumulating decision error  
                         if (s->type== XVID_TYPE_BVOP) {  
                                 rc->bquant_error[data->quant] += ((double)(s->quant * s->length) / desired) - data->quant;  
1280    
1281                                  if (rc->bquant_error[data->quant] >= 1.0) {          /* Compute the average size of frames per frame type */
1282                                          rc->bquant_error[data->quant] -= 1.0;          for(i=0; i<3; i++) {
1283                                          data->quant++;                  /* Special case for missing type or weird case */
1284                                  }                  if (rc->count[i] == 0 || rc->pb_iboost_tax_ratio == 0) {
1285                            rc->avg_length[i] = 1;
1286                          }else{                          }else{
1287                                  rc->pquant_error[data->quant] += ((double)(s->quant * s->length) / desired) - data->quant;                          rc->avg_length[i] = rc->tot_scaled_length[i];
1288    
1289                      if (rc->pquant_error[data->quant] >= 1.0) {                          if (i == (XVID_TYPE_IVOP-1)) {
1290                                          rc->pquant_error[data->quant] -= 1.0;                                  /* I Frames total has to be added the boost total */
1291                                          ++data->quant;                                  rc->avg_length[i] += ivop_boost_total;
1292                            } else {
1293                                    /* P/B frames has to taxed */
1294                                    rc->avg_length[i] *= rc->pb_iboost_tax_ratio;
1295                                  }                                  }
1296    
1297                            /* Finally compute the average frame size */
1298                            rc->avg_length[i] /= (double)rc->count[i];
1299                          }                          }
1300                  }                  }
1301    
1302              /* cap to min/max quant */          /* Assymetric curve compression */
1303            if (rc->param.curve_compression_high || rc->param.curve_compression_low) {
1304                    double symetric_total;
1305                    double assymetric_delta_total;
1306    
1307              if (data->quant < data->min_quant[s->type-1]) {                  /* Like I frame boosting, assymetric curve compression modifies the total
1308                  data->quant = data->min_quant[s->type-1];                   * amount of needed bits, we must compute the ratio so we can prescale
1309              }else if (data->quant > data->max_quant[s->type-1]) {                   lengths */
1310                  data->quant = data->max_quant[s->type-1];                  symetric_total = 0;
1311              }                  assymetric_delta_total = 0;
1312                    for (i=0; i<rc->num_frames; i++) {
1313                            double assymetric_delta;
1314                            double dbytes;
1315                            twopass_stat_t * s = &rc->stats[i];
1316    
1317              /* subsequent p/b frame quants can only be +- 2 */                          /* I Frames are not concerned by assymetric scaling */
1318                  if (s->type != XVID_TYPE_IVOP && rc->last_quant[s->type-1] && capped_to_max_framesize == 0) {                          if (s->type == XVID_TYPE_IVOP)
1319                                    continue;
1320    
1321                          if (data->quant > rc->last_quant[s->type-1] + 2) {                          /* During the real run, we would have to apply the iboost tax */
1322                                  data->quant = rc->last_quant[s->type-1] + 2;                          dbytes = s->scaled_length * rc->pb_iboost_tax_ratio;
                                 DPRINTF(XVID_DEBUG_RC, "p/b-frame quantizer prevented from rising too steeply");  
                         }  
                         if (data->quant < rc->last_quant[s->type-1] - 2) {  
                                 data->quant = rc->last_quant[s->type-1] - 2;  
                                 DPRINTF(XVID_DEBUG_RC, "p/b-frame quantizer prevented from falling too steeply");  
                         }  
                 }  
1323    
1324                  if (capped_to_max_framesize == 0) {                          /* Update the symmetric curve compression total */
1325                  rc->last_quant[s->type-1] = data->quant;                          symetric_total += dbytes;
                 }  
1326    
1327                            /* Apply assymetric curve compression */
1328                            if (dbytes > rc->avg_length[s->type-1])
1329                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * (double)rc->param.curve_compression_high / 100.0f;
1330                            else
1331                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * (double)rc->param.curve_compression_low  / 100.0f;
1332    
1333          }   /* if */                          /* Cap to the minimum frame size if needed */
1334                            if (dbytes + assymetric_delta < rc->min_length[s->type-1])
1335                                    assymetric_delta = rc->min_length[s->type-1] - dbytes;
1336    
1337                            /* Accumulate after assymetric curve compression */
1338                            assymetric_delta_total += assymetric_delta;
1339      }      }
1340    
1341      return 0;                  /* Compute the tax that all p/b frames have to pay in order to respect the
1342                     * bit distribution changes that the assymetric compression curve imposes
1343                     * We want assymetric_total = sum(0, n-1, tax.scaled_length)
1344                     *      ie assymetric_total = ratio.sum(0, n-1, scaled_length)
1345                     *         ratio = assymetric_total / symmetric_total */
1346                    rc->assymetric_tax_ratio = ((double)symetric_total - (double)assymetric_delta_total) / (double)symetric_total;
1347            } else {
1348                    rc->assymetric_tax_ratio = 1.0f;
1349  }  }
1350    
1351            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Assymetric tax ratio:%.2f\n", rc->assymetric_tax_ratio);
1352    
1353            /* Last bits that need to be reset */
1354  static int rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)          rc->overflow = 0;
1355            rc->KFoverflow = 0;
1356            rc->KFoverflow_partial = 0;
1357            rc->KF_idx = 0;
1358            rc->desired_total = 0;
1359            rc->real_total = 0;
1360    
1361            /* Job done */
1362            return;
1363    }
1364    
1365    /*****************************************************************************
1366     * Still more low level stuff (nothing to do with stats treatment)
1367     ****************************************************************************/
1368    
1369    /* This function returns an allocated string containing a complete line read
1370     * from the file starting at the current position */
1371    static char *
1372    readline(FILE *f)
1373  {  {
1374      stat_t * s = &rc->stats[data->frame_num];          char *buffer = NULL;
1375            int buffer_size = 0;
1376      if (data->frame_num >= rc->num_frames) {          int pos = 0;
         /* insufficent stats data */  
         return 0;  
     }  
1377    
1378      rc->quant_count[data->quant]++;          do {
1379                    int c;
1380    
1381      if (data->type == XVID_TYPE_IVOP) {                  /* Read a character from the stream */
1382          int kfdiff = (rc->keyframe_locations[rc->KF_idx] -      rc->keyframe_locations[rc->KF_idx - 1]);                  c = fgetc(f);
1383    
1384          rc->overflow += rc->KFoverflow;                  /* Is that EOF or new line ? */
1385          rc->KFoverflow = s->desired_length - data->length;                  if(c == EOF || c == '\n')
1386                            break;
1387    
1388          if (kfdiff > 1) {  // non-consecutive keyframes                  /* Do we have to update buffer ? */
1389              rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);                  if(pos >= buffer_size - 1) {
1390          }else{ // consecutive keyframes                          buffer_size += BUF_SZ;
1391                          rc->overflow += rc->KFoverflow;                          buffer = (char*)realloc(buffer, buffer_size);
1392                          rc->KFoverflow = 0;                          if (buffer == NULL)
1393                          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;  
1394      }      }
1395    
1396      DPRINTF(XVID_DEBUG_RC, "[%i] quant:%i stats1:%i scaled:%i actual:%i overflow:%i\n",                  buffer[pos] = c;
1397          data->frame_num,                  pos++;
1398          data->quant,          } while(1);
         s->length,  
         s->scaled_length,  
         data->length,  
         rc->overflow);  
1399    
1400      return(0);          /* Read \n or EOF */
1401            if (buffer == NULL) {
1402                    /* EOF, so we reached the end of the file, return NULL */
1403                    if(feof(f))
1404                            return(NULL);
1405    
1406                    /* Just an empty line with just a newline, allocate a 1 byte buffer to
1407                     * store a zero length string */
1408                    buffer = (char*)malloc(1);
1409                    if(buffer == NULL)
1410                            return(NULL);
1411  }  }
1412    
1413            /* Zero terminated string */
1414            buffer[pos] = '\0';
1415    
1416            return(buffer);
1417    }
1418    
1419  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
1420     * string */
1421    static char *
1422    skipspaces(char *string)
1423  {  {
1424      switch(opt)          const char spaces[] =
1425      {      {
1426      case XVID_PLG_INFO :                          ' ','\t','\0'
1427          return 0;                  };
1428            const char *spacechar = spaces;
1429    
1430            if (string == NULL) return(NULL);
1431    
1432            while (*string != '\0') {
1433                    /* Test against space chars */
1434                    while (*spacechar != '\0') {
1435                            if (*string == *spacechar) {
1436                                    string++;
1437                                    spacechar = spaces;
1438                                    break;
1439                            }
1440                            spacechar++;
1441                    }
1442    
1443      case XVID_PLG_CREATE :                  /* No space char */
1444          return rc_2pass2_create((xvid_plg_create_t*)param1, param2);                  if (*spacechar == '\0') return(string);
1445            }
1446    
1447      case XVID_PLG_DESTROY :          return(string);
1448          return rc_2pass2_destroy((rc_2pass2_t*)handle, (xvid_plg_destroy_t*)param1);  }
1449    
1450      case XVID_PLG_BEFORE :  /* This function returns a boolean that tells if the string is only a
1451          return rc_2pass2_before((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);   * comment */
1452    static int
1453    iscomment(char *string)
1454    {
1455            const char comments[] =
1456                    {
1457                            '#',';', '%', '\0'
1458                    };
1459            const char *cmtchar = comments;
1460            int iscomment = 0;
1461    
1462            if (string == NULL) return(1);
1463    
1464            string = skipspaces(string);
1465    
1466            while(*cmtchar != '\0') {
1467                    if(*string == *cmtchar) {
1468                            iscomment = 1;
1469                            break;
1470                    }
1471                    cmtchar++;
1472            }
1473    
1474      case XVID_PLG_AFTER :          return(iscomment);
         return rc_2pass2_after((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);  
1475      }      }
1476    
1477      return XVID_ERR_FAIL;  #if 0
1478    static void
1479    stats_print(rc_2pass2_t * rc)
1480    {
1481            int i;
1482            const char frame_type[4] = { 'i', 'p', 'b', 's'};
1483    
1484            for (i=0; i<rc->num_frames; i++) {
1485                    twopass_stat_t *s = &rc->stats[i];
1486                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- frame:%d type:%c quant:%d stats:%d scaled:%d desired:%d actual:%d overflow(%c):%.2f\n",
1487                                    i, frame_type[s->type-1], -1, s->length, s->scaled_length,
1488                                    s->desired_length, -1, frame_type[s->type-1], -1.0f);
1489  }  }
1490    }
1491    #endif
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