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revision 1.1.2.6, Tue May 20 17:28:25 2003 UTC revision 1.1.2.28, Fri Dec 5 14:44:35 2003 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    #undef COMPENSATE_FORMULA
33    
34  #include <stdio.h>  #include <stdio.h>
35  #include <math.h>  #include <math.h>
36    #include <limits.h>
 #define RAD2DEG 57.295779513082320876798154814105  
 #define DEG2RAD 0.017453292519943295769236907684886  
37    
38  #include "../xvid.h"  #include "../xvid.h"
39  #include "../image/image.h"  #include "../image/image.h"
40    
41    /*****************************************************************************
42     * Some constants
43     ****************************************************************************/
44    
45    #define DEFAULT_KEYFRAME_BOOST 0
46    #define DEFAULT_OVERFLOW_CONTROL_STRENGTH 10
47    #define DEFAULT_CURVE_COMPRESSION_HIGH 0
48    #define DEFAULT_CURVE_COMPRESSION_LOW 0
49    #define DEFAULT_MAX_OVERFLOW_IMPROVEMENT 60
50    #define DEFAULT_MAX_OVERFLOW_DEGRADATION 60
51    
52    /* Keyframe settings */
53    #define DEFAULT_KFREDUCTION 20
54    #define DEFAULT_KFTHRESHOLD 1
55    
56    /*****************************************************************************
57     * Structures
58     ****************************************************************************/
59    
60    /* Statistics */
61  typedef struct {  typedef struct {
62      int type;               /* first pass type */      int type;               /* first pass type */
63      int quant;              /* first pass quant */      int quant;              /* first pass quant */
64            int quant2;             /* Second pass quant */
65          int blks[3];                    /* k,m,y blks */          int blks[3];                    /* k,m,y blks */
66      int length;             /* first pass length */      int length;             /* first pass length */
67      int scaled_length;      /* scaled length */      int scaled_length;      /* scaled length */
68      int desired_length;     /* desired length; calcuated during encoding */          int desired_length;     /* desired length; calculated during encoding */
69            int error;
70    
71      int zone_mode;   /* XVID_ZONE_xxx */      int zone_mode;   /* XVID_ZONE_xxx */
72      double weight;      double weight;
73  } stat_t;  } twopass_stat_t;
   
74    
75    /* Context struct */
   
 /* context struct */  
76  typedef struct  typedef struct
77  {  {
78      xvid_plugin_2pass2_t param;      xvid_plugin_2pass2_t param;
79    
80      /* constant statistical data */          /*----------------------------------
81             * constant statistical data
82             *--------------------------------*/
83    
84            /* Number of frames of the sequence */
85          int num_frames;          int num_frames;
86    
87            /* Number of Intra frames of the sequence */
88      int num_keyframes;      int num_keyframes;
     uint64_t target;    /* target filesize */  
89    
90      int count[3];   /* count of each frame types */          /* Target filesize to reach */
91      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;  
92    
93      /* dynamic */          /* Count of each frame types */
94            int count[3];
95    
96      int * keyframe_locations;          /* Total length of each frame types (1st pass) */
97      stat_t * stats;          uint64_t tot_length[3];
98    
99      double pquant_error[32];          /* Average length of each frame types (used first for 1st pass data and
100      double bquant_error[32];           * then for scaled averages */
101      int quant_count[32];          double avg_length[3];
102      int last_quant[3];  
103            /* Minimum frame length allowed for each frame type */
104            int min_length[3];
105    
106            /* Total bytes per frame type once the curve has been scaled
107             * NB: advanced parameters do not change this value. This field
108             *     represents the total scaled w/o any advanced settings */
109            uint64_t tot_scaled_length[3];
110    
111            /* Maximum observed frame size observed during the first pass, the RC
112             * will try tp force all frame sizes in the second pass to be under that
113             * limit */
114            int max_length;
115    
116            /*----------------------------------
117             * Zones statistical data
118             *
119             * ToDo: Fix zones, current
120             *       implementation is buggy
121             *--------------------------------*/
122    
123            /* Average weight of the zones */
124            double avg_weight;
125    
126            /* Total length used by XVID_ZONE_QUANT zones */
127            int64_t tot_quant;
128    
129            /*----------------------------------
130             * Advanced settings helper ratios
131             *--------------------------------*/
132    
133            /* This the ratio that has to be applied to all p/b frames in order
134             * to reserve/retrieve bits for/from keyframe boosting and consecutive
135             * keyframe penalty */
136            double pb_iboost_tax_ratio;
137    
138            /* This the ratio to apply to all b/p frames in order to respect the
139             * assymetric curve compression while respecting a target filesize
140             * NB: The assymetric delta gain has to be computed before this ratio
141             *     is applied, and then the delta is added to the scaled size */
142            double assymetric_tax_ratio;
143    
144            /*----------------------------------
145             * Data from the stats file kept
146             * into RAM for easy access
147             *--------------------------------*/
148    
149            /* Array of keyframe locations
150             * eg: rc->keyframe_locations[100] returns the frame number of the 100th
151             *     keyframe */
152            int *keyframe_locations;
153    
154      double curve_comp_error;          /* Index of the last keyframe used in the keyframe_location */
     int overflow;  
     int KFoverflow;  
     int KFoverflow_partial;  
155      int KF_idx;      int KF_idx;
156    
157      double fq_error;          /* Array of all 1st pass data file -- see the twopass_stat_t structure
158  } rc_2pass2_t;           * definition for more details */
159            twopass_stat_t * stats;
160    
161            /*----------------------------------
162             * Histerysis helpers
163             *--------------------------------*/
164    
165            /* This field holds the int2float conversion errors of each quant per
166             * frame type, this allow the RC to keep track of rouding error and thus
167             * increase or decrease the chosen quant according to this residue */
168            double quant_error[3][32];
169    
170            /* This fields stores the count of each quant usage per frame type
171             * No real role but for debugging */
172            int quant_count[3][32];
173    
174            /* Last valid quantizer used per frame type, it allows quantizer
175             * increament/decreament limitation in order to avoid big image quality
176             * "jumps" */
177            int last_quant[3];
178    
179            /*----------------------------------
180             * Overflow control
181             *--------------------------------*/
182    
183            /* Current overflow that has to be distributed to p/b frames */
184            double overflow;
185    
186            /* Total overflow for keyframes -- not distributed directly */
187            double KFoverflow;
188    
189            /* Amount of keyframe overflow to introduce to the global p/b frame
190             * overflow counter at each encoded frame */
191            double KFoverflow_partial;
192    
193            /* Unknown ???
194             * ToDo: description */
195            double fq_error;
196    
197  #define BUF_SZ 1024          /*----------------------------------
198  #define MAX_COLS    5           * Debug
199             *--------------------------------*/
200            double desired_total;
201            double real_total;
202    } rc_2pass2_t;
203    
204    
205  /* open stats file, and count num frames */  /*****************************************************************************
206     * Sub plugin functions prototypes
207     ****************************************************************************/
208    
209    static int rc_2pass2_create(xvid_plg_create_t * create, rc_2pass2_t ** handle);
210    static int rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data);
211    static int rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data);
212    static int rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy);
213    
214    /*****************************************************************************
215     * Plugin definition
216     ****************************************************************************/
217    
218  static int det_stats_length(rc_2pass2_t * rc, char * filename)  int
219    xvid_plugin_2pass2(void * handle, int opt, void * param1, void * param2)
220  {  {
221      FILE * f;          switch(opt) {
222      int n, ignore;          case XVID_PLG_INFO :
223      char type;          case XVID_PLG_FRAME :
   
     rc->num_frames = 0;  
     rc->num_keyframes = 0;  
   
     if ((f = fopen(filename, "rt")) == NULL)  
224          return 0;          return 0;
225    
226      while((n = fscanf(f, "%c %d %d %d %d %d %d\n",          case XVID_PLG_CREATE :
227          &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++;  
         }  
     }  
228    
229      fclose(f);          case XVID_PLG_DESTROY :
230                    return rc_2pass2_destroy((rc_2pass2_t*)handle, (xvid_plg_destroy_t*)param1);
231    
232      return 1;          case XVID_PLG_BEFORE :
233                    return rc_2pass2_before((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);
234    
235            case XVID_PLG_AFTER :
236                    return rc_2pass2_after((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);
237  }  }
238    
239            return XVID_ERR_FAIL;
240    }
241    
242    /*****************************************************************************
243     * Sub plugin functions definitions
244     ****************************************************************************/
245    
246    /* First a few local helping function prototypes */
247    static  int statsfile_count_frames(rc_2pass2_t * rc, char * filename);
248    static  int statsfile_load(rc_2pass2_t *rc, char * filename);
249    static void zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create);
250    static void first_pass_stats_prepare_data(rc_2pass2_t * rc);
251    static void first_pass_scale_curve_internal(rc_2pass2_t *rc);
252    static void scaled_curve_apply_advanced_parameters(rc_2pass2_t * rc);
253    #if 0
254    static void stats_print(rc_2pass2_t * rc);
255    #endif
256    
257  /* open stats file(s) and read into rc->stats array */  /*----------------------------------------------------------------------------
258     *--------------------------------------------------------------------------*/
259    
260  static int load_stats(rc_2pass2_t *rc, char * filename)  static int
261    rc_2pass2_create(xvid_plg_create_t * create, rc_2pass2_t **handle)
262  {  {
263      FILE * f;          xvid_plugin_2pass2_t * param = (xvid_plugin_2pass2_t *)create->param;
264      int i, not_scaled;          rc_2pass2_t * rc;
265            int i;
266    
267            rc = malloc(sizeof(rc_2pass2_t));
268            if (rc == NULL)
269                    return XVID_ERR_MEMORY;
270    
271      if ((f = fopen(filename, "rt"))==NULL)          rc->param = *param;
         return 0;  
272    
273      i = 0;          /* Initialize all defaults */
274          not_scaled = 0;  #define _INIT(a, b) if((a) <= 0) (a) = (b)
275      while(i < rc->num_frames) {          /* Let's set our defaults if needed */
276          stat_t * s = &rc->stats[i];          _INIT(rc->param.keyframe_boost, DEFAULT_KEYFRAME_BOOST);
277          int n;          _INIT(rc->param.overflow_control_strength, DEFAULT_OVERFLOW_CONTROL_STRENGTH);
278          char type;          _INIT(rc->param.curve_compression_high, DEFAULT_CURVE_COMPRESSION_HIGH);
279            _INIT(rc->param.curve_compression_low, DEFAULT_CURVE_COMPRESSION_LOW);
280            _INIT(rc->param.max_overflow_improvement, DEFAULT_MAX_OVERFLOW_IMPROVEMENT);
281            _INIT(rc->param.max_overflow_degradation,  DEFAULT_MAX_OVERFLOW_DEGRADATION);
282    
283            /* Keyframe settings */
284            _INIT(rc->param.kfreduction, DEFAULT_KFREDUCTION);
285            _INIT(rc->param.kfthreshold, DEFAULT_KFTHRESHOLD);
286    #undef _INIT
287    
288                  s->scaled_length = 0;          /* Initialize some stuff to zero */
289          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++) {
290          if (n == EOF) break;                  int j;
291                  if (n < 7) {                  for (j=0; j<32; j++) {
292                          not_scaled = 1;                          rc->quant_error[i][j] = 0;
293                            rc->quant_count[i][j] = 0;
294                  }                  }
   
         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;  
295          }          }
296    
297          i++;          for (i=0; i<3; i++) rc->last_quant[i] = 0;
298    
299            rc->fq_error = 0;
300    
301            /* Count frames (and intra frames) in the stats file, store the result into
302             * the rc structure */
303            if (statsfile_count_frames(rc, param->filename) == -1) {
304                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- ERROR: fopen %s failed\n", param->filename);
305                    free(rc);
306                    return(XVID_ERR_FAIL);
307      }      }
     rc->num_frames = i;  
308    
309      fclose(f);          /* Allocate the stats' memory */
310            if ((rc->stats = malloc(rc->num_frames * sizeof(twopass_stat_t))) == NULL) {
311                    free(rc);
312                    return(XVID_ERR_MEMORY);
313            }
314    
315      return 1;          /* Allocate keyframes location's memory
316             * PS: see comment in pre_process0 for the +1 location requirement */
317            rc->keyframe_locations = malloc((rc->num_keyframes + 1) * sizeof(int));
318            if (rc->keyframe_locations == NULL) {
319                    free(rc->stats);
320                    free(rc);
321                    return(XVID_ERR_MEMORY);
322  }  }
323    
324            /* Load the first pass stats */
325            if (statsfile_load(rc, param->filename) == -1) {
326                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- ERROR: fopen %s failed\n", param->filename);
327                    free(rc->keyframe_locations);
328                    free(rc->stats);
329                    free(rc);
330                    return XVID_ERR_FAIL;
331            }
332    
333            /* Compute the target filesize */
334            if (rc->param.bitrate<0) {
335                    /* if negative, bitrate equals the target (in kbytes) */
336                    rc->target = (-rc->param.bitrate) * 1024;
337            } else if (rc->num_frames  < create->fbase/create->fincr) {
338                    /* Source sequence is less than 1s long, we do as if it was 1s long */
339                    rc->target = rc->param.bitrate / 8;
340            } else {
341                    /* Target filesize = bitrate/8 * numframes / framerate */
342                    rc->target =
343                            ((uint64_t)rc->param.bitrate * (uint64_t)rc->num_frames * \
344                             (uint64_t)create->fincr) / \
345                            ((uint64_t)create->fbase * 8);
346            }
347    
348            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Frame rate: %d/%d (%ffps)\n",
349                            create->fbase, create->fincr,
350                            (double)create->fbase/(double)create->fincr);
351            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Number of frames: %d\n", rc->num_frames);
352            if(rc->param.bitrate>=0)
353                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Target bitrate: %ld\n", rc->param.bitrate);
354            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Target filesize: %lld\n", rc->target);
355    
356            /* Compensate the average frame overhead caused by the container */
357            rc->target -= rc->num_frames*rc->param.container_frame_overhead;
358            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Container Frame overhead: %d\n", rc->param.container_frame_overhead);
359            if(rc->param.container_frame_overhead)
360                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- New target filesize after container compensation: %lld\n", rc->target);
361    
362            /* Gathers some information about first pass stats:
363             *  - finds the minimum frame length for each frame type during 1st pass.
364             *     rc->min_size[]
365             *  - determines the maximum frame length observed (no frame type distinction).
366             *     rc->max_size
367             *  - count how many times each frame type has been used.
368             *     rc->count[]
369             *  - total bytes used per frame type
370             *     rc->total[]
371             *  - store keyframe location
372             *     rc->keyframe_locations[]
373             */
374            first_pass_stats_prepare_data(rc);
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                    zone_process(rc, create);
381                    /* Perform internal curve scaling */
382                    first_pass_scale_curve_internal(rc);
383            } else {
384                    /* External scaling -- zones are ignored */
385      for (i = 0; i < rc->num_frames; i++) {      for (i = 0; i < rc->num_frames; i++) {
386          stat_t * s = &rc->stats[i];                          rc->stats[i].zone_mode = XVID_ZONE_WEIGHT;
387          DPRINTF(XVID_DEBUG_RC, "%i %i %i %i\n", s->type, s->quant, s->length, s->scaled_length);                          rc->stats[i].weight = 1.0;
388      }      }
389                    rc->avg_weight = 1.0;
390                    rc->tot_quant = 0;
391  }  }
 #endif  
   
 /* pre-process the statistics data  
     - for each type, count, tot_length, min_length, max_length  
     - set keyframes_locations  
 */  
392    
393  void pre_process0(rc_2pass2_t * rc)          /* Apply advanced curve options, and compute some parameters in order to
394  {           * shape the curve in the BEFORE/AFTER pair of functions */
395      int i,j;          scaled_curve_apply_advanced_parameters(rc);
396    
397      for (i=0; i<3; i++) {          *handle = rc;
398          rc->count[i]=0;          return(0);
         rc->tot_length[i] = 0;  
         rc->last_quant[i] = 0;  
399      }      }
400    
401      for (i=j=0; i<rc->num_frames; i++) {  /*----------------------------------------------------------------------------
402          stat_t * s = &rc->stats[i];   *--------------------------------------------------------------------------*/
   
         rc->count[s->type-1]++;  
         rc->tot_length[s->type-1] += s->length;  
403    
404          if (i == 0 || s->length < rc->min_length[s->type-1]) {  static int
405              rc->min_length[s->type-1] = s->length;  rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy)
406          }  {
407            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- target_total:%lld desired_total:%.2f (%.2f%%) actual_total:%.2f (%.2f%%)\n",
408                            rc->target,
409                            rc->desired_total,
410                            100*rc->desired_total/(double)rc->target,
411                            rc->real_total,
412                            100*rc->real_total/(double)rc->target);
413    
414          if (i == 0 || s->length > rc->max_length) {          free(rc->keyframe_locations);
415              rc->max_length = s->length;          free(rc->stats);
416            free(rc);
417            return(0);
418          }          }
419    
420          if (s->type == XVID_TYPE_IVOP) {  /*----------------------------------------------------------------------------
421              rc->keyframe_locations[j] = i;   *--------------------------------------------------------------------------*/
             j++;  
         }  
     }  
     rc->keyframe_locations[j] = i;  
 }  
422    
423    static int
424    rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)
425    {
426            twopass_stat_t * s = &rc->stats[data->frame_num];
427            double dbytes;
428            double scaled_quant;
429            double overflow;
430            int capped_to_max_framesize = 0;
431    
432  /* calculate zone weight "center" */          /* This function is quite long but easy to understand. In order to simplify
433             * the code path (a bit), we treat 3 cases that can return immediatly. */
434    
435  static void zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)          /* First case: Another plugin has already set a quantizer */
436  {          if (data->quant > 0)
437      int i,j;                  return(0);
     int n = 0;  
438    
439      rc->avg_weight = 0.0;          /* Second case: We are in a Quant zone */
440      rc->tot_quant = 0;          if (s->zone_mode == XVID_ZONE_QUANT) {
441                    rc->fq_error += s->weight;
442                    data->quant = (int)rc->fq_error;
443                    rc->fq_error -= data->quant;
444    
445                    s->desired_length = s->length;
446    
447      if (create->num_zones == 0) {                  return(0);
         for (j = 0; j < rc->num_frames; j++) {  
             rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;  
             rc->stats[j].weight = 1.0;  
         }  
         rc->avg_weight += rc->num_frames * 1.0;  
         n += rc->num_frames;  
448      }      }
449    
450            /* Third case: insufficent stats data */
451            if (data->frame_num >= rc->num_frames)
452                    return(0);
453    
454      for(i=0; i < create->num_zones; i++) {          /*************************************************************************/
455            /*************************************************************************/
456            /*************************************************************************/
457    
458          int next = (i+1<create->num_zones) ? create->zones[i+1].frame : rc->num_frames;          /*-------------------------------------------------------------------------
459             * Frame bit allocation first part
460             *
461             * First steps apply user settings, just like it is done in the theoritical
462             * scaled_curve_apply_advanced_parameters
463             *-----------------------------------------------------------------------*/
464    
465          if (i==0 && create->zones[i].frame > 0) {          /* Set desired to what we are wanting to obtain for this frame */
466              for (j = 0; j < create->zones[i].frame && j < rc->num_frames; j++) {          dbytes = (double)s->scaled_length;
                 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;  
         }  
467    
468          if (create->zones[i].mode == XVID_ZONE_WEIGHT) {          /* IFrame user settings*/
469              for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {          if (s->type == XVID_TYPE_IVOP) {
470                  rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;                  /* Keyframe boosting -- All keyframes benefit from it */
471                  rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;                  dbytes += dbytes*rc->param.keyframe_boost / 100;
472              }  
473              next -= create->zones[i].frame;  #if 0 /* ToDo: decide how to apply kfthresholding */
474              rc->avg_weight += (double)(next * create->zones[i].increment) / (double)create->zones[i].base;  #endif
475              n += next;          } else {
476          }else{  // XVID_ZONE_QUANT  
477              for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {                  /* P/S/B frames must reserve some bits for iframe boosting */
478                  rc->stats[j].zone_mode = XVID_ZONE_QUANT;                  dbytes *= rc->pb_iboost_tax_ratio;
                 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;  
479    
480      DPRINTF(XVID_DEBUG_RC, "center_weight: %f (for %i frames);   fixed_bytes: %i\n", rc->avg_weight, n, rc->tot_quant);                  /* Apply assymetric curve compression */
481                    if (rc->param.curve_compression_high || rc->param.curve_compression_low) {
482                            double assymetric_delta;
483    
484                            /* Compute the assymetric delta, this is computed before applying
485                             * the tax, as done in the pre_process function */
486                            if (dbytes > rc->avg_length[s->type-1])
487                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_high / 100.0;
488                            else
489                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_low  / 100.0;
490    
491                            /* Now we must apply the assymetric tax, else our curve compression
492                             * would not give a theoritical target size equal to what it is
493                             * expected */
494                            dbytes *= rc->assymetric_tax_ratio;
495    
496                            /* Now we can add the assymetric delta */
497                            dbytes += assymetric_delta;
498                    }
499  }  }
500    
501            /* That is what we would like to have -- Don't put that chunk after
502             * overflow control, otherwise, overflow is counted twice and you obtain
503             * half sized bitrate sequences */
504            s->desired_length  = (int)dbytes;
505            rc->desired_total += dbytes;
506    
507  /* scale the curve */          /*------------------------------------------------------------------------
508             * Frame bit allocation: overflow control part.
509             *
510             * Unlike the theoritical scaled_curve_apply_advanced_parameters, here
511             * it's real encoding and we need to make sure we don't go so far from
512             * what is our ideal scaled curve.
513             *-----------------------------------------------------------------------*/
514    
515  static void internal_scale(rc_2pass2_t *rc)          /* Compute the overflow we should compensate */
516  {          if (s->type != XVID_TYPE_IVOP) {
517          int64_t target  = rc->target - rc->tot_quant;                  double frametype_factor;
518          int64_t pass1_length = rc->tot_length[0] + rc->tot_length[1] + rc->tot_length[2] - rc->tot_quant;                  double framesize_factor;
         int min_size[3];  
         double scaler;  
         int i;  
519    
520                    /* Take only the desired part of overflow */
521                    overflow = rc->overflow;
522    
523          /* perform an initial scale pass.                  /* Factor that will take care to decrease the overflow applied
524             if a frame size is scaled underneath our hardcoded minimums, then we force the                   * according to the importance of this frame type in term of
525             frame size to the minimum, and deduct the original & scaled frmae length from the                   * overall size */
526             original and target total lengths */                  frametype_factor  = rc->count[XVID_TYPE_IVOP-1]*rc->avg_length[XVID_TYPE_IVOP-1];
527                    frametype_factor += rc->count[XVID_TYPE_PVOP-1]*rc->avg_length[XVID_TYPE_PVOP-1];
528          min_size[0] = ((rc->stats[0].blks[0]*22) + 240) / 8;                  frametype_factor += rc->count[XVID_TYPE_BVOP-1]*rc->avg_length[XVID_TYPE_BVOP-1];
529          min_size[1] = (rc->stats[0].blks[0] + 88) / 8;                  frametype_factor /= rc->count[s->type-1]*rc->avg_length[s->type-1];
530          min_size[2] = 8;                  frametype_factor  = 1/frametype_factor;
531    
532                    /* Factor that will take care not to compensate too much for this frame
533                     * size */
534                    framesize_factor  = dbytes;
535                    framesize_factor /= rc->avg_length[s->type-1];
536    
537          scaler = (double)target / (double)pass1_length;                  /* Treat only the overflow part concerned by this frame type and size */
538                    overflow *= frametype_factor;
539    #if 0
540                    /* Leave this one alone, as it impacts badly on quality */
541                    overflow *= framesize_factor;
542    #endif
543    
544          if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {                  /* Apply the overflow strength imposed by the user */
545                  DPRINTF(XVID_DEBUG_RC, "undersize warning\n");                  overflow *= (rc->param.overflow_control_strength/100.0f);
546          scaler = 1.0;          } else {
547                    /* no overflow applied in IFrames because:
548                     *  - their role is important as they're references for P/BFrames.
549                     *  - there aren't much in typical sequences, so if an IFrame overflows too
550                     *    much, this overflow may impact the next IFrame too much and generate
551                     *    a sequence of poor quality frames */
552                    overflow = 0;
553          }          }
554    
555      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 */
556            if (fabs(overflow) > fabs(rc->overflow))
557          for (i=0; i<rc->num_frames; i++) {                  overflow = rc->overflow;
                 stat_t * s = &rc->stats[i];  
                 int len;  
558    
559          if (s->zone_mode == XVID_ZONE_QUANT) {          /* Make sure the overflow doesn't make the frame size to get out of the range
560              s->scaled_length = s->length;           * [-max_degradation..+max_improvment] */
561          }else {          if (overflow > dbytes*rc->param.max_overflow_improvement / 100) {
562                      len = (int)((double)s->length * scaler * s->weight / rc->avg_weight);                  if(overflow <= dbytes)
563                      if (len < min_size[s->type-1]) {            /* force frame size */                          dbytes += dbytes * rc->param.max_overflow_improvement / 100;
564                              s->scaled_length = min_size[s->type-1];                  else
565                              target -= s->scaled_length;                          dbytes += overflow * rc->param.max_overflow_improvement / 100;
566                              pass1_length -= s->length;          } else if (overflow < - dbytes * rc->param.max_overflow_degradation / 100) {
567                    dbytes -= dbytes * rc->param.max_overflow_degradation / 100;
568                      }else{                      }else{
569                              s->scaled_length = 0;                  dbytes += overflow;
                     }  
         }  
570          }          }
571    
572      scaler = (double)target / (double)pass1_length;          /*-------------------------------------------------------------------------
573      if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {           * Frame bit allocation last part:
574                  DPRINTF(XVID_DEBUG_RC,"undersize warning\n");           *
575                  scaler = 1.0;           * Cap frame length so we don't reach neither bigger frame sizes than first
576             * pass nor smaller than the allowed minimum.
577             *-----------------------------------------------------------------------*/
578    
579            if (dbytes > s->length) {
580                    dbytes = s->length;
581            } else if (dbytes < rc->min_length[s->type-1]) {
582                    dbytes = rc->min_length[s->type-1];
583            } else if (dbytes > rc->max_length) {
584                    /* ToDo: this condition is always wrong as max_length == maximum frame
585                     * length of first pass, so the first condition already caps the frame
586                     * size... */
587                    capped_to_max_framesize = 1;
588                    dbytes = rc->max_length;
589                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- frame:%d Capped to maximum frame size\n",
590                                    data->frame_num);
591          }          }
592    
593          DPRINTF(XVID_DEBUG_RC, "target=%i, tot_length=%i, scaler=%f\n", (int)target, (int)pass1_length, scaler);          /*------------------------------------------------------------------------
594             * Desired frame length <-> quantizer mapping
595             *-----------------------------------------------------------------------*/
596    
597          for (i=0; i<rc->num_frames; i++) {          /* For bframes we must retrieve the original quant used (sent to xvidcore)
598                  stat_t * s = &rc->stats[i];           * as core applies the bquant formula before writing the stat log entry */
599            if(s->type == XVID_TYPE_BVOP) {
600    
601                  if (s->scaled_length==0) {      /* ignore frame with forced frame sizes */                  twopass_stat_t *b_ref = s;
                         s->scaled_length = (int)((double)s->length * scaler * s->weight / rc->avg_weight);  
                 }  
         }  
 }  
602    
603                    /* Find the reference frame */
604                    while(b_ref != &rc->stats[0] && b_ref->type == XVID_TYPE_BVOP)
605                            b_ref--;
606    
607                    /* Compute the original quant */
608                    s->quant  = 2*(100*s->quant - data->bquant_offset);
609                    s->quant += data->bquant_ratio - 1; /* to avoid rouding issues */
610                    s->quant  = s->quant/data->bquant_ratio - b_ref->quant;
611            }
612    
613            /* Don't laugh at this very 'simple' quant<->filesize relationship, it
614             * proves to be acurate enough for our algorithm */
615            scaled_quant = (double)s->quant*(double)s->length/(double)dbytes;
616    
617  void pre_process1(rc_2pass2_t * rc)  #ifdef COMPENSATE_FORMULA
618  {          /* We know xvidcore will apply the bframe formula again, so we compensate
619      int i;           * it right now to make sure we would not apply it twice */
620      double total1, total2;          if(s->type == XVID_TYPE_BVOP) {
     uint64_t ivop_boost_total;  
621    
622      ivop_boost_total = 0;                  twopass_stat_t *b_ref = s;
     rc->curve_comp_error = 0;  
623    
624      for (i=0; i<3; i++) {                  /* Find the reference frame */
625          rc->tot_scaled_length[i] = 0;                  while(b_ref != &rc->stats[0] && b_ref->type == XVID_TYPE_BVOP)
626                            b_ref--;
627    
628                    /* Compute the quant it would be if the core did not apply the bframe
629                     * formula */
630                    scaled_quant  = 100*scaled_quant - data->bquant_offset;
631                    scaled_quant += data->bquant_ratio - 1; /* to avoid rouding issues */
632                    scaled_quant /= data->bquant_ratio;
633      }      }
634    #endif
635    
636      for (i=0; i<rc->num_frames; i++) {          /* Quantizer has been scaled using floating point operations/results, we
637          stat_t * s = &rc->stats[i];           * must cast it to integer */
638            data->quant = (int)scaled_quant;
639    
640          rc->tot_scaled_length[s->type-1] += s->scaled_length;          /* Let's clip the computed quantizer, if needed */
641            if (data->quant < 1) {
642                    data->quant = 1;
643            } else if (data->quant > 31) {
644                    data->quant = 31;
645            } else {
646    
647          if (s->type == XVID_TYPE_IVOP) {                  /* The frame quantizer has not been clipped, this appears to be a good
648              ivop_boost_total += s->scaled_length * rc->param.keyframe_boost / 100;                   * computed quantizer, do not loose quantizer decimal part that we
649                     * accumulate for later reuse when its sum represents a complete
650                     * unit. */
651                    rc->quant_error[s->type-1][data->quant] += scaled_quant - (double)data->quant;
652    
653                    if (rc->quant_error[s->type-1][data->quant] >= 1.0) {
654                            rc->quant_error[s->type-1][data->quant] -= 1.0;
655                            data->quant++;
656                    } else if (rc->quant_error[s->type-1][data->quant] <= -1.0) {
657                            rc->quant_error[s->type-1][data->quant] += 1.0;
658                            data->quant--;
659          }          }
660      }      }
661    
662      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
663                                          (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
664             * the quantizer again with user's quant ranges. "Safely" means the Rate
665             * Control could learn more about this quantizer, this knowledge is useful
666             * for future frames even if it this quantizer won't be really used atm,
667             * that's why we don't perform this clipping earlier. */
668            if (data->quant < data->min_quant[s->type-1]) {
669                    data->quant = data->min_quant[s->type-1];
670            } else if (data->quant > data->max_quant[s->type-1]) {
671                    data->quant = data->max_quant[s->type-1];
672            }
673    
674            /* To avoid big quality jumps from frame to frame, we apply a "security"
675             * rule that makes |last_quant - new_quant| <= 2. This rule only applies
676             * to predicted frames (P and B) */
677            if (s->type != XVID_TYPE_IVOP && rc->last_quant[s->type-1] && capped_to_max_framesize == 0) {
678    
679      for(i=0; i<3; i++) {                  if (data->quant > rc->last_quant[s->type-1] + 2) {
680          if (rc->count[i] == 0 || rc->movie_curve == 0) {                          data->quant = rc->last_quant[s->type-1] + 2;
681              rc->avg_length[i] = 1;                          DPRINTF(XVID_DEBUG_RC,
682          }else{                                          "[xvid rc] -- frame %d p/b-frame quantizer prevented from rising too steeply\n",
683              rc->avg_length[i] = rc->tot_scaled_length[i] / rc->count[i] / rc->movie_curve;                                          data->frame_num);
684                    }
685                    if (data->quant < rc->last_quant[s->type-1] - 2) {
686                            data->quant = rc->last_quant[s->type-1] - 2;
687                            DPRINTF(XVID_DEBUG_RC,
688                                            "[xvid rc] -- frame:%d p/b-frame quantizer prevented from falling too steeply\n",
689                                            data->frame_num);
690          }          }
691      }      }
692    
693      /* alt curve stuff here */          /* We don't want to pollute the RC histerisis when our computed quant has
694             * been computed from a capped frame size */
695      if (rc->param.use_alt_curve) {          if (capped_to_max_framesize == 0)
696          const double avg_pvop = rc->avg_length[XVID_TYPE_PVOP-1];                  rc->last_quant[s->type-1] = data->quant;
         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];  
697    
698                  rc->alt_curve_low = avg_pvop - avg_pvop * (double)rc->param.alt_curve_low_dist / 100.0;          /* Don't forget to force 1st pass frame type ;-) */
699                  rc->alt_curve_low_diff = avg_pvop - rc->alt_curve_low;          data->type = s->type;
                 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;  
700    
701          if (rc->param.alt_curve_use_auto) {          /* Store the quantizer into the statistics -- Used to compensate the double
702              if (tot_bvop + tot_pvop > tot_scaled_bvop + tot_scaled_pvop) {           * formula symptom */
703                                  rc->param.alt_curve_min_rel_qual = (int)(100.0 - (100.0 - 100.0 /          s->quant2 = data->quant;
                                         ((double)(tot_pvop + tot_bvop) / (double)(tot_scaled_pvop + tot_scaled_bvop))) * (double)rc->param.alt_curve_auto_str / 100.0);  
704    
705                                  if (rc->param.alt_curve_min_rel_qual < 20)          return 0;
                                         rc->param.alt_curve_min_rel_qual = 20;  
             }else{  
                                 rc->param.alt_curve_min_rel_qual = 100;  
             }  
706          }          }
                 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;  
707    
708          if (rc->param.alt_curve_low_dist > 100) {  /*----------------------------------------------------------------------------
709                          switch(rc->param.alt_curve_type) {   *--------------------------------------------------------------------------*/
             case XVID_CURVE_SINE: // Sine Curve (high aggressiveness)  
                                 rc->alt_curve_qual_dev *= 2.0 / (1.0 + sin(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff)));  
                                 rc->alt_curve_mid_qual = 1.0 - rc->alt_curve_qual_dev * sin(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff));  
                                 break;  
                         case XVID_CURVE_LINEAR: // Linear (medium aggressiveness)  
                                 rc->alt_curve_qual_dev *= 2.0 / (1.0 + avg_pvop / rc->alt_curve_low_diff);  
                                 rc->alt_curve_mid_qual = 1.0 - rc->alt_curve_qual_dev * avg_pvop / rc->alt_curve_low_diff;  
                                 break;  
                         case XVID_CURVE_COSINE: // Cosine Curve (low aggressiveness)  
                                 rc->alt_curve_qual_dev *= 2.0 / (1.0 + (1.0 - cos(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff))));  
                                 rc->alt_curve_mid_qual = 1.0 - rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff)));  
                         }  
                 }  
     }  
     /* --- */  
710    
711    static int
712    rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)
713    {
714            const char frame_type[4] = { 'i', 'p', 'b', 's'};
715            twopass_stat_t * s = &rc->stats[data->frame_num];
716    
717      total1=total2=0;          /* Insufficent stats data */
718      for (i=0; i<rc->num_frames; i++) {          if (data->frame_num >= rc->num_frames)
719          stat_t * s = &rc->stats[i];                  return 0;
720    
721          if (s->type != XVID_TYPE_IVOP) {          /* Update the quantizer counter */
722              double dbytes,dbytes2;          rc->quant_count[s->type-1][data->quant]++;
723    
724              dbytes = s->scaled_length / rc->movie_curve;          /* Update the frame type overflow */
725              dbytes2 = 0; /* XXX: warning */          if (data->type == XVID_TYPE_IVOP) {
726              total1 += dbytes;                  int kfdiff = 0;
             if (s->type == XVID_TYPE_BVOP)  
                 dbytes *= rc->avg_length[XVID_TYPE_PVOP-1] / rc->avg_length[XVID_TYPE_BVOP-1];  
727    
728              if (rc->param.use_alt_curve) {                  if(rc->KF_idx != rc->num_frames -1) {
729                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                          kfdiff  = rc->keyframe_locations[rc->KF_idx+1];
730                            kfdiff -= rc->keyframe_locations[rc->KF_idx];
731                    }
732    
733                      if (dbytes >= rc->alt_curve_high) {                  /* Flush Keyframe overflow accumulator */
734                                                  dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev);                  rc->overflow += rc->KFoverflow;
735    
736                    /* Store the frame overflow to the keyframe accumulator */
737                    rc->KFoverflow = s->desired_length - data->length;
738    
739                    if (kfdiff > 1) {
740                            /* Non-consecutive keyframes case:
741                             * We can then divide this total keyframe overflow into equal parts
742                             * that we will distribute into regular overflow at each frame
743                             * between the sequence bounded by two IFrames */
744                            rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);
745                      }else{                      }else{
746                                                  switch(rc->param.alt_curve_type) {                          /* Consecutive keyframes case:
747                          case XVID_CURVE_SINE :                           * Flush immediatly the keyframe overflow and reset keyframe
748                                                      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 */
749                                                          break;                          rc->overflow += rc->KFoverflow;
750                          case XVID_CURVE_LINEAR :                          rc->KFoverflow = 0;
751                                                      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))));  
                                                 }  
752                                          }                                          }
753                    rc->KF_idx++;
754                  }else{                  }else{
755                      if (dbytes <= rc->alt_curve_low) {                  /* Accumulate the frame overflow */
756                                                  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))));  
                                                 }  
                                         }  
757    
758                    /* Distribute part of the keyframe overflow */
759                    rc->overflow += rc->KFoverflow_partial;
760    
761                    /* Don't forget to substract that same amount from the total keyframe
762                     * overflow */
763                    rc->KFoverflow -= rc->KFoverflow_partial;
764                  }                  }
765    
766            rc->overflow += s->error = s->desired_length - data->length;
767            rc->real_total += data->length;
768    
769              }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",
770                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                          data->frame_num,
771                      dbytes2=((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_high / 100.0);                          frame_type[data->type-1],
772                  }else{                          data->quant,
773                                  dbytes2 = ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_low / 100.0);                          s->length,
774                  }                          s->scaled_length,
775              }                          s->desired_length,
776                            s->desired_length - s->error,
777                            -s->error,
778                            rc->overflow);
779    
780              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;  
         }  
781      }      }
782    
783      rc->curve_comp_scale = total1 / total2;  /*****************************************************************************
784     * Helper functions definition
785     ****************************************************************************/
786    
787      if (!rc->param.use_alt_curve) {  /* Default buffer size for reading lines */
788          DPRINTF(XVID_DEBUG_RC, "middle frame size for asymmetric curve compression: %i\n",  #define BUF_SZ   1024
789              (int)(rc->avg_length[XVID_TYPE_PVOP-1] * rc->curve_comp_scale));  
790      }  /* Helper functions for reading/parsing the stats file */
791    static char *skipspaces(char *string);
792    static int iscomment(char *string);
793    static char *readline(FILE *f);
794    
795    /* This function counts the number of frame entries in the stats file
796     * It also counts the number of I Frames */
797    static int
798    statsfile_count_frames(rc_2pass2_t * rc, char * filename)
799    {
800            FILE * f;
801            char *line;
802            int lines;
803    
804            rc->num_frames = 0;
805            rc->num_keyframes = 0;
806    
807      if (rc->param.use_alt_curve) {          if ((f = fopen(filename, "rb")) == NULL)
808          int bonus_bias = rc->param.alt_curve_bonus_bias;                  return(-1);
         int oldquant = 1;  
809    
810              if (rc->param.alt_curve_use_auto_bonus_bias)          lines = 0;
811                      bonus_bias = rc->param.alt_curve_min_rel_qual;          while ((line = readline(f)) != NULL) {
812    
813              rc->alt_curve_curve_bias_bonus = (total1 - total2) * (double)bonus_bias / 100.0 / (double)(rc->num_frames /* - credits_frames */ - rc->num_keyframes);                  char *ptr;
814              rc->curve_comp_scale = ((total1 - total2) * (1.0 - (double)bonus_bias / 100.0) + total2) / total2;                  char type;
815                    int fields;
816    
817                    lines++;
818    
819          /* special info for alt curve:  bias bonus and quantizer thresholds */                  /* We skip spaces */
820                    ptr = skipspaces(line);
821    
822                  DPRINTF(XVID_DEBUG_RC, "avg scaled framesize:%i", (int)rc->avg_length[XVID_TYPE_PVOP-1]);                  /* Skip coment lines or empty lines */
823                  DPRINTF(XVID_DEBUG_RC, "bias bonus:%i bytes", (int)rc->alt_curve_curve_bias_bonus);                  if(iscomment(ptr) || *ptr == '\0') {
824                            free(line);
825                            continue;
826                    }
827    
828                  for (i=1; i <= (int)(rc->alt_curve_high*2)+1; i++) {                  /* Read the stat line from buffer */
829              double curve_temp, dbytes;                  fields = sscanf(ptr, "%c", &type);
             int newquant;  
830    
831              dbytes = i;                  /* Valid stats files have at least 6 fields */
832                          if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                  if (fields == 1) {
833                  if (dbytes >= rc->alt_curve_high) {                          switch(type) {
834                                          curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev);                          case 'i':
835                  }else{                          case 'I':
836                                          switch(rc->param.alt_curve_type)                                  rc->num_keyframes++;
837                                          {                          case 'p':
838                                          case XVID_CURVE_SINE :                          case 'P':
839                                                  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)));                          case 'b':
840                                                  break;                          case 'B':
841                                          case XVID_CURVE_LINEAR :                          case 's':
842                                                  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);                          case 'S':
843                                    rc->num_frames++;
844                                                  break;                                                  break;
845                                          case XVID_CURVE_COSINE :                          default:
846                                                  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))));                                  DPRINTF(XVID_DEBUG_RC,
847                                                    "[xvid rc] -- WARNING: L%d unknown frame type used (%c).\n",
848                                                    lines, type);
849                                          }                                          }
                                 }  
                         }else{  
                 if (dbytes <= rc->alt_curve_low) {  
                                         curve_temp = dbytes;  
850                  }else{                  }else{
851                                          switch(rc->param.alt_curve_type)                                  DPRINTF(XVID_DEBUG_RC,
852                                          {                                                  "[xvid rc] -- WARNING: L%d misses some stat fields (%d).\n",
853                                          case XVID_CURVE_SINE :                                                  lines, 6-fields);
                                                 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))));  
854                                          }                                          }
                                 }  
                         }  
   
                         if (rc->movie_curve > 1.0)  
                                 dbytes *= rc->movie_curve;  
855    
856                          newquant = (int)(dbytes * 2.0 / (curve_temp * rc->curve_comp_scale + rc->alt_curve_curve_bias_bonus));                  /* Free the line buffer */
857                          if (newquant > 1) {                  free(line);
                                 if (newquant != oldquant) {  
                     int percent = (int)((i - rc->avg_length[XVID_TYPE_PVOP-1]) * 100.0 / rc->avg_length[XVID_TYPE_PVOP-1]);  
                                         oldquant = newquant;  
                                         DPRINTF(XVID_DEBUG_RC, "quant:%i threshold at %i : %i percent", newquant, i, percent);  
                                 }  
                         }  
858                  }                  }
859    
860      }          /* We are done with the file */
861            fclose(f);
862    
863      rc->overflow = 0;          return(0);
     rc->KFoverflow = 0;  
     rc->KFoverflow_partial = 0;  
     rc->KF_idx = 1;  
864  }  }
865    
866    /* open stats file(s) and read into rc->stats array */
867    static int
868    statsfile_load(rc_2pass2_t *rc, char * filename)
869    {
870            FILE * f;
871            int processed_entries;
872    
873            /* Opens the file */
874            if ((f = fopen(filename, "rb"))==NULL)
875                    return(-1);
876    
877            processed_entries = 0;
878            while(processed_entries < rc->num_frames) {
879                    char type;
880                    int fields;
881                    twopass_stat_t * s = &rc->stats[processed_entries];
882                    char *line, *ptr;
883    
884  static int rc_2pass2_create(xvid_plg_create_t * create, rc_2pass2_t ** handle)                  /* Read the line from the file */
885  {                  if((line = readline(f)) == NULL)
886      xvid_plugin_2pass2_t * param = (xvid_plugin_2pass2_t *)create->param;                          break;
     rc_2pass2_t * rc;  
     int i;  
887    
888      rc = malloc(sizeof(rc_2pass2_t));                  /* We skip spaces */
889      if (rc == NULL)                  ptr = skipspaces(line);
         return XVID_ERR_MEMORY;  
890    
891      rc->param = *param;                  /* Skip comment lines or empty lines */
892                    if(iscomment(ptr) || *ptr == '\0') {
893                            free(line);
894                            continue;
895                    }
896    
897      if (rc->param.keyframe_boost <= 0) rc->param.keyframe_boost = 0;                  /* Reset this field that is optional */
898      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;  
899    
900      if (!det_stats_length(rc, param->filename)){                  /* Convert the fields */
901          DPRINTF(XVID_DEBUG_RC,"fopen %s failed\n", param->filename);                  fields = sscanf(ptr,
902          free(rc);                                                  "%c %d %d %d %d %d %d\n",
903          return XVID_ERR_FAIL;                                                  &type,
904                                                    &s->quant,
905                                                    &s->blks[0], &s->blks[1], &s->blks[2],
906                                                    &s->length,
907                                                    &s->scaled_length);
908    
909                    /* Free line buffer, we don't need it anymore */
910                    free(line);
911    
912                    /* Fail silently, this has probably been warned in
913                     * statsfile_count_frames */
914                    if(fields != 6 && fields != 7)
915                            continue;
916    
917                    /* Convert frame type */
918                    switch(type) {
919                    case 'i':
920                    case 'I':
921                            s->type = XVID_TYPE_IVOP;
922                            break;
923                    case 'p':
924                    case 'P':
925                    case 's':
926                    case 'S':
927                            s->type = XVID_TYPE_PVOP;
928                            break;
929                    case 'b':
930                    case 'B':
931                            s->type = XVID_TYPE_BVOP;
932                            break;
933                    default:
934                            /* Same as before, fail silently */
935                            continue;
936      }      }
937    
938      if ((rc->stats = malloc(rc->num_frames * sizeof(stat_t))) == NULL) {                  /* Ok it seems it's been processed correctly */
939          free(rc);                  processed_entries++;
         return XVID_ERR_MEMORY;  
940      }      }
941    
942      /* XXX: do we need an addition location */          /* Close the file */
943      if ((rc->keyframe_locations = malloc((rc->num_keyframes + 1) * sizeof(int))) == NULL) {          fclose(f);
         free(rc->stats);  
         free(rc);  
         return XVID_ERR_MEMORY;  
     }  
944    
945      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;  
946      }      }
947    
948      /* pre-process our stats */  /* pre-process the statistics data
949     * - for each type, count, tot_length, min_length, max_length
950     * - set keyframes_locations */
951    static void
952    first_pass_stats_prepare_data(rc_2pass2_t * rc)
953    {
954            int i,j;
955    
956          if (rc->num_frames  < create->fbase/create->fincr) {          /* *rc fields initialization
957                  rc->target = rc->param.bitrate / 8;     /* one second */           * NB: INT_MAX and INT_MIN are used in order to be immediately replaced
958          }else{           *     with real values of the 1pass */
959                  rc->target = (rc->param.bitrate * rc->num_frames * create->fincr) / (create->fbase * 8);          for (i=0; i<3; i++) {
960                    rc->count[i]=0;
961                    rc->tot_length[i] = 0;
962                    rc->min_length[i] = INT_MAX;
963          }          }
964    
965      DPRINTF(XVID_DEBUG_RC, "rc->target : %i\n", rc->target);          rc->max_length = INT_MIN;
   
         rc->target -= rc->num_frames*24;        /* avi file header */  
966    
967            /* Loop through all frames and find/compute all the stuff this function
968             * is supposed to do */
969            for (i=j=0; i<rc->num_frames; i++) {
970                    twopass_stat_t * s = &rc->stats[i];
971    
972          pre_process0(rc);                  rc->count[s->type-1]++;
973                    rc->tot_length[s->type-1] += s->length;
974    
975          if (rc->param.bitrate) {                  if (s->length < rc->min_length[s->type-1]) {
976          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;  
977      }      }
         pre_process1(rc);  
978    
979      for (i=0; i<32;i++) {                  if (s->length > rc->max_length) {
980          rc->pquant_error[i] = 0;                          rc->max_length = s->length;
         rc->bquant_error[i] = 0;  
         rc->quant_count[i] = 0;  
981      }      }
982    
983      rc->fq_error = 0;                  if (s->type == XVID_TYPE_IVOP) {
984                            rc->keyframe_locations[j] = i;
985      *handle = rc;                          j++;
         return(0);  
986  }  }
   
   
 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);  
987  }  }
988    
989            /* NB:
990             * The "per sequence" overflow system considers a natural sequence to be
991             * formed by all frames between two iframes, so if we want to make sure
992             * the system does not go nuts during last sequence, we force the last
993             * frame to appear in the keyframe locations array. */
994            rc->keyframe_locations[j] = i;
995    
996            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Min 1st pass IFrame length: %d\n", rc->min_length[0]);
997            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Min 1st pass PFrame length: %d\n", rc->min_length[1]);
998            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Min 1st pass BFrame length: %d\n", rc->min_length[2]);
999    }
1000    
1001  static int rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)  /* calculate zone weight "center" */
1002    static void
1003    zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)
1004  {  {
1005      stat_t * s = &rc->stats[data->frame_num];          int i,j;
1006      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;  
1007    
1008              s->desired_length = s->length;          rc->avg_weight = 0.0;
1009            rc->tot_quant = 0;
1010    
         }else { /* XVID_ZONE_WEIGHT */  
1011    
1012              if (data->frame_num >= rc->num_frames) {          if (create->num_zones == 0) {
1013                  /* insufficent stats data */                  for (j = 0; j < rc->num_frames; j++) {
1014                  return 0;                          rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1015                            rc->stats[j].weight = 1.0;
1016              }              }
1017                    rc->avg_weight += rc->num_frames * 1.0;
1018              overflow = rc->overflow / 8;        /* XXX: why by 8 */                  n += rc->num_frames;
   
             if (s->type == XVID_TYPE_IVOP) {        /* XXX: why */  
                 overflow = 0;  
1019              }              }
1020    
             desired = s->scaled_length;  
   
             dbytes = desired;  
             if (s->type == XVID_TYPE_IVOP) {  
                 dbytes += desired * rc->param.keyframe_boost / 100;  
             }  
             dbytes /= rc->movie_curve;  
1021    
1022              if (s->type == XVID_TYPE_BVOP) {          for(i=0; i < create->num_zones; i++) {
                 dbytes *= rc->avg_length[XVID_TYPE_PVOP-1] / rc->avg_length[XVID_TYPE_BVOP-1];  
             }  
1023    
1024              if (rc->param.payback_method == XVID_PAYBACK_BIAS) {                  int next = (i+1<create->num_zones) ? create->zones[i+1].frame : rc->num_frames;
                 desired =(int)(rc->curve_comp_error / rc->param.bitrate_payback_delay);  
             }else{  
                         //printf("desired=%i, dbytes=%i\n", desired,dbytes);  
                         desired = (int)(rc->curve_comp_error * dbytes /  
                                 rc->avg_length[XVID_TYPE_PVOP-1] / rc->param.bitrate_payback_delay);  
                         //printf("desired=%i\n", desired);  
1025    
1026                          if (labs(desired) > fabs(rc->curve_comp_error)) {                  if (i==0 && create->zones[i].frame > 0) {
1027                                  desired = (int)rc->curve_comp_error;                          for (j = 0; j < create->zones[i].frame && j < rc->num_frames; j++) {
1028                                    rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1029                                    rc->stats[j].weight = 1.0;
1030                          }                          }
1031                            rc->avg_weight += create->zones[i].frame * 1.0;
1032                            n += create->zones[i].frame;
1033              }              }
1034    
1035              rc->curve_comp_error -= desired;                  if (create->zones[i].mode == XVID_ZONE_WEIGHT) {
1036                            for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {
1037              /* alt curve */                                  rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1038                                    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))));  
1039                                                  }                                                  }
1040                            next -= create->zones[i].frame;
1041                            rc->avg_weight += (double)(next * create->zones[i].increment) / (double)create->zones[i].base;
1042                            n += next;
1043                    }else{  /* XVID_ZONE_QUANT */
1044                            for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {
1045                                    rc->stats[j].zone_mode = XVID_ZONE_QUANT;
1046                                    rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;
1047                                    rc->tot_quant += rc->stats[j].length;
1048                                          }                                          }
                                 }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))));  
1049                              }                              }
1050                                          }                                          }
1051            rc->avg_weight = n>0 ? rc->avg_weight/n : 1.0;
1052    
1053            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- center_weight:%f (for %d frames)  fixed_bytes:%d\n", rc->avg_weight, n, rc->tot_quant);
1054                                  }                                  }
                                 if (s->type == XVID_TYPE_BVOP)  
                                         curve_temp *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
1055    
                                 curve_temp = curve_temp * rc->curve_comp_scale + rc->alt_curve_curve_bias_bonus;  
1056    
1057                                  desired += ((int)curve_temp);  /* scale the curve */
1058                                  rc->curve_comp_error += curve_temp - (int)curve_temp;  static void
1059                          }else{  first_pass_scale_curve_internal(rc_2pass2_t *rc)
1060                                  if (s->type == XVID_TYPE_BVOP)  {
1061                                          dbytes *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];          int64_t target;
1062            int64_t pass1_length;
1063            double scaler;
1064            int i, num_MBs;
1065    
1066                                  desired += ((int)dbytes);          /* We remove the bytes used by the fixed quantizer zones
1067                                  rc->curve_comp_error += dbytes - (int)dbytes;           * ToDo: this approach is flawed, the same amount of bytes is removed from
1068                          }           *       target and first pass data, this has no sense, zone_process should
1069             *       give us two results one for unscaled data (1pass) and the other
1070             *       one for scaled data and we should then write:
1071             *       target = rc->target - rc->tot_quant_scaled;
1072             *       pass1_length = rc->i+p+b - rc->tot_quant_firstpass */
1073            target = rc->target - rc->tot_quant;
1074    
1075            /* Do the same for the first pass data */
1076            pass1_length  = rc->tot_length[XVID_TYPE_IVOP-1];
1077            pass1_length += rc->tot_length[XVID_TYPE_PVOP-1];
1078            pass1_length += rc->tot_length[XVID_TYPE_BVOP-1];
1079            pass1_length -= rc->tot_quant;
1080    
1081              }else if ((rc->param.curve_compression_high + rc->param.curve_compression_low) &&   s->type != XVID_TYPE_IVOP) {          /* Let's compute a linear scaler in order to perform curve scaling */
1082            scaler = (double)target / (double)pass1_length;
1083    
1084                  curve_temp = rc->curve_comp_scale;          if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {
1085                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                  DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- WARNING: Undersize detected before correction\n");
1086                      curve_temp *= ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_high / 100.0);                  scaler = 1.0;
                 } else {  
                     curve_temp *= ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_low / 100.0);  
1087                  }                  }
1088    
1089                  if (s->type == XVID_TYPE_BVOP){          /* Compute min frame lengths (for each frame type) according to the number
1090                      curve_temp *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];           * of MBs. We sum all block type counters of frame 0, this gives us the
1091                  }           * number of MBs.
1092             *
1093             * We compare these hardcoded values with observed values in first pass
1094             * (determined in pre_process0).Then we keep the real minimum. */
1095    
1096                  desired += (int)curve_temp;          /* Number of MBs */
1097                  rc->curve_comp_error += curve_temp - (int)curve_temp;          num_MBs  = rc->stats[0].blks[0];
1098              }else{          num_MBs += rc->stats[0].blks[1];
1099                  if (s->type == XVID_TYPE_BVOP){          num_MBs += rc->stats[0].blks[2];
1100                                  dbytes *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
1101                  }          /* Minimum for I frames */
1102            if(rc->min_length[XVID_TYPE_IVOP-1] > ((num_MBs*22) + 240) / 8)
1103                    rc->min_length[XVID_TYPE_IVOP-1] = ((num_MBs*22) + 240) / 8;
1104    
1105            /* Minimum for P/S frames */
1106            if(rc->min_length[XVID_TYPE_PVOP-1] > ((num_MBs) + 88)  / 8)
1107                    rc->min_length[XVID_TYPE_PVOP-1] = ((num_MBs) + 88)  / 8;
1108    
1109            /* Minimum for B frames */
1110            if(rc->min_length[XVID_TYPE_BVOP-1] > 8)
1111                    rc->min_length[XVID_TYPE_BVOP-1] = 8;
1112    
1113            /* Perform an initial scale pass.
1114             *
1115             * If a frame size is scaled underneath our hardcoded minimums, then we
1116             * force the frame size to the minimum, and deduct the original & scaled
1117             * frame length from the original and target total lengths */
1118            for (i=0; i<rc->num_frames; i++) {
1119                    twopass_stat_t * s = &rc->stats[i];
1120                    int len;
1121    
1122                          desired += (int)dbytes;                  /* No need to scale frame length for which a specific quantizer is
1123                          rc->curve_comp_error += dbytes - (int)dbytes;                   * specified thanks to zones */
1124                    if (s->zone_mode == XVID_ZONE_QUANT) {
1125                            s->scaled_length = s->length;
1126                            continue;
1127              }              }
1128    
1129                    /* Compute the scaled length */
1130                    len = (int)((double)s->length * scaler * s->weight / rc->avg_weight);
1131    
1132                  if (desired > s->length) {  /* if desired length exceeds the pass1 length.. */                  /* Compare with the computed minimum */
1133                          rc->curve_comp_error += desired - s->length;                  if (len < rc->min_length[s->type-1]) {
1134                          desired = s->length;                          /* This is a 'forced size' frame, set its frame size to the
1135                             * computed minimum */
1136                            s->scaled_length = rc->min_length[s->type-1];
1137    
1138                            /* Remove both scaled and original size from their respective
1139                             * total counters, as we prepare a second pass for 'regular'
1140                             * frames */
1141                            target -= s->scaled_length;
1142                            pass1_length -= s->length;
1143                  }else{                  }else{
1144                  if (desired < rc->min_length[s->type-1]) {                          /* Do nothing for now, we'll scale this later */
1145                      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];  
1146                  }                  }
1147                  }                  }
1148    
1149              s->desired_length = desired;          /* The first pass on data substracted all 'forced size' frames from the
1150             * total counters. Now, it's possible to scale the 'regular' frames. */
1151    
1152              /* if this keyframe is too close to the next, reduce it's byte allotment          /* Scaling factor for 'regular' frames */
1153              XXX: why do we do this after setting the desired length  */          scaler = (double)target / (double)pass1_length;
1154    
1155                  if (s->type == XVID_TYPE_IVOP) {          /* Detect undersizing */
1156                          int KFdistance = rc->keyframe_locations[rc->KF_idx] - rc->keyframe_locations[rc->KF_idx - 1];          if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {
1157                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- WARNING: Undersize detected after correction\n");
1158                    scaler = 1.0;
1159            }
1160    
1161                  if (KFdistance < rc->param.kftreshold) {          /* Do another pass with the new scaler */
1162            for (i=0; i<rc->num_frames; i++) {
1163                    twopass_stat_t * s = &rc->stats[i];
1164    
1165                      KFdistance = KFdistance - rc->param.min_key_interval;                  /* Ignore frame with forced frame sizes */
1166                    if (s->scaled_length == 0)
1167                            s->scaled_length = (int)((double)s->length * scaler * s->weight / rc->avg_weight);
1168            }
1169    
1170                                  if (KFdistance >= 0) {          /* Job done */
1171                          int KF_min_size;          return;
1172    }
1173    
1174                                          KF_min_size = desired * (100 - rc->param.kfreduction) / 100;  /* Apply all user settings to the scaled curve
1175                                          if (KF_min_size < 1)   * This implies:
1176                                                  KF_min_size = 1;   *   keyframe boosting
1177     *   high/low compression */
1178    static void
1179    scaled_curve_apply_advanced_parameters(rc_2pass2_t * rc)
1180    {
1181            int i;
1182            int64_t ivop_boost_total;
1183    
1184                                          desired = KF_min_size + (desired - KF_min_size) * KFdistance /          /* Reset the rate controller (per frame type) total byte counters */
1185                                                  (rc->param.kftreshold - rc->param.min_key_interval);          for (i=0; i<3; i++) rc->tot_scaled_length[i] = 0;
1186    
1187                                          if (desired < 1)          /* Compute total bytes for each frame type */
1188                                                  desired = 1;          for (i=0; i<rc->num_frames;i++) {
1189                                  }                  twopass_stat_t *s = &rc->stats[i];
1190                          }                  rc->tot_scaled_length[s->type-1] += s->scaled_length;
1191                  }                  }
1192    
1193              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
1194             * the scaled distribution. During this pass over the complete stats data,
1195             * we see how much bits two user settings will get/give from/to p&b frames:
1196             *  - keyframe boosting
1197             *  - keyframe distance penalty */
1198            rc->KF_idx = 0;
1199            ivop_boost_total = 0;
1200            for (i=0; i<rc->num_frames; i++) {
1201                    twopass_stat_t * s = &rc->stats[i];
1202    
1203                  // Foxer: reign in overflow with huge frames                  /* Some more work is needed for I frames */
1204                  if (labs(overflow) > labs(rc->overflow)) {                  if (s->type == XVID_TYPE_IVOP) {
1205                          overflow = rc->overflow;                          int ivop_boost;
                 }  
1206    
1207              // Foxer: make sure overflow doesn't run away                          /* Accumulate bytes needed for keyframe boosting */
1208                            ivop_boost = s->scaled_length*rc->param.keyframe_boost/100;
1209    
1210                  if (overflow > desired * rc->param.max_overflow_improvement / 100) {  #if 0 /* ToDo: decide how to apply kfthresholding */
1211                          desired += (overflow <= desired) ? desired * rc->param.max_overflow_improvement / 100 :  #endif
1212                                  overflow * rc->param.max_overflow_improvement / 100;                          /* If the frame size drops under the minimum length, then cap ivop_boost */
1213                  }else if (overflow < desired * rc->param.max_overflow_degradation / -100){                          if (ivop_boost + s->scaled_length < rc->min_length[XVID_TYPE_IVOP-1])
1214                          desired += desired * rc->param.max_overflow_degradation / -100;                                  ivop_boost = rc->min_length[XVID_TYPE_IVOP-1] - s->scaled_length;
                 }else{  
                         desired += overflow;  
                 }  
1215    
1216              if (desired > rc->max_length) {                          /* Accumulate the ivop boost */
1217                          capped_to_max_framesize = 1;                          ivop_boost_total += ivop_boost;
                         desired = rc->max_length;  
                 }  
1218    
1219              // make sure to not scale below the minimum framesize                          /* Don't forget to update the keyframe index */
1220              if (desired < rc->min_length[s->type-1]) {                          rc->KF_idx++;
1221                  desired = rc->min_length[s->type-1];                  }
1222              }              }
1223    
1224            /* Initialize the IBoost tax ratio for P/S/B frames
1225             *
1226             * This ratio has to be applied to p/b/s frames in order to reserve
1227             * additional bits for keyframes (keyframe boosting) or if too much
1228             * keyframe distance is applied, bits retrieved from the keyframes.
1229             *
1230             * ie pb_length *= rc->pb_iboost_tax_ratio;
1231             *
1232             *    gives the ideal length of a p/b frame */
1233    
1234              // very 'simple' quant<->filesize relationship          /* Compute the total length of p/b/s frames (temporary storage into
1235              data->quant= (s->quant * s->length) / desired;           * movie_curve) */
1236            rc->pb_iboost_tax_ratio  = (double)rc->tot_scaled_length[XVID_TYPE_PVOP-1];
1237            rc->pb_iboost_tax_ratio += (double)rc->tot_scaled_length[XVID_TYPE_BVOP-1];
1238    
1239            /* Compute the ratio described above
1240             *     taxed_total = sum(0, n, tax*scaled_length)
1241             * <=> taxed_total = tax.sum(0, n, scaled_length)
1242             * <=> tax = taxed_total / original_total */
1243            rc->pb_iboost_tax_ratio =
1244                    (rc->pb_iboost_tax_ratio - ivop_boost_total) /
1245                    rc->pb_iboost_tax_ratio;
1246    
1247                  if (data->quant < 1) {          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- IFrame boost tax ratio:%.2f\n",
1248                          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;  
1249    
1250                                  if (rc->bquant_error[data->quant] >= 1.0) {          /* Compute the average size of frames per frame type */
1251                                          rc->bquant_error[data->quant] -= 1.0;          for(i=0; i<3; i++) {
1252                                          data->quant++;                  /* Special case for missing type or weird case */
1253                                  }                  if (rc->count[i] == 0 || rc->pb_iboost_tax_ratio == 0) {
1254                            rc->avg_length[i] = 1;
1255                          }else{                          }else{
1256                                  rc->pquant_error[data->quant] += ((double)(s->quant * s->length) / desired) - data->quant;                          rc->avg_length[i] = rc->tot_scaled_length[i];
1257    
1258                      if (rc->pquant_error[data->quant] >= 1.0) {                          if (i == (XVID_TYPE_IVOP-1)) {
1259                                          rc->pquant_error[data->quant] -= 1.0;                                  /* I Frames total has to be added the boost total */
1260                                          ++data->quant;                                  rc->avg_length[i] += ivop_boost_total;
1261                            } else {
1262                                    /* P/B frames has to taxed */
1263                                    rc->avg_length[i] *= rc->pb_iboost_tax_ratio;
1264                                  }                                  }
1265    
1266                            /* Finally compute the average frame size */
1267                            rc->avg_length[i] /= (double)rc->count[i];
1268                          }                          }
1269                  }                  }
1270    
1271              /* cap to min/max quant */          /* Assymetric curve compression */
1272            if (rc->param.curve_compression_high || rc->param.curve_compression_low) {
1273                    double symetric_total;
1274                    double assymetric_delta_total;
1275    
1276              if (data->quant < data->min_quant[s->type-1]) {                  /* Like I frame boosting, assymetric curve compression modifies the total
1277                  data->quant = data->min_quant[s->type-1];                   * amount of needed bits, we must compute the ratio so we can prescale
1278              }else if (data->quant > data->max_quant[s->type-1]) {                   lengths */
1279                  data->quant = data->max_quant[s->type-1];                  symetric_total = 0;
1280              }                  assymetric_delta_total = 0;
1281                    for (i=0; i<rc->num_frames; i++) {
1282                            double assymetric_delta;
1283                            double dbytes;
1284                            twopass_stat_t * s = &rc->stats[i];
1285    
1286              /* subsequent p/b frame quants can only be +- 2 */                          /* I Frames are not concerned by assymetric scaling */
1287                  if (s->type != XVID_TYPE_IVOP && rc->last_quant[s->type-1] && capped_to_max_framesize == 0) {                          if (s->type == XVID_TYPE_IVOP)
1288                                    continue;
1289    
1290                          if (data->quant > rc->last_quant[s->type-1] + 2) {                          /* During the real run, we would have to apply the iboost tax */
1291                                  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");  
                         }  
                 }  
1292    
1293                  if (capped_to_max_framesize == 0) {                          /* Update the symmetric curve compression total */
1294                  rc->last_quant[s->type-1] = data->quant;                          symetric_total += dbytes;
                 }  
1295    
1296                            /* Apply assymetric curve compression */
1297                            if (dbytes > rc->avg_length[s->type-1])
1298                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * (double)rc->param.curve_compression_high / 100.0f;
1299                            else
1300                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * (double)rc->param.curve_compression_low  / 100.0f;
1301    
1302          }   /* if */                          /* Cap to the minimum frame size if needed */
1303                            if (dbytes + assymetric_delta < rc->min_length[s->type-1])
1304                                    assymetric_delta = rc->min_length[s->type-1] - dbytes;
1305    
1306                            /* Accumulate after assymetric curve compression */
1307                            assymetric_delta_total += assymetric_delta;
1308      }      }
1309    
1310      return 0;                  /* Compute the tax that all p/b frames have to pay in order to respect the
1311                     * bit distribution changes that the assymetric compression curve imposes
1312                     * We want assymetric_total = sum(0, n-1, tax.scaled_length)
1313                     *      ie assymetric_total = ratio.sum(0, n-1, scaled_length)
1314                     *         ratio = assymetric_total / symmetric_total */
1315                    rc->assymetric_tax_ratio = ((double)symetric_total - (double)assymetric_delta_total) / (double)symetric_total;
1316            } else {
1317                    rc->assymetric_tax_ratio = 1.0f;
1318  }  }
1319    
1320            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Assymetric tax ratio:%.2f\n", rc->assymetric_tax_ratio);
1321    
1322            /* Last bits that need to be reset */
1323  static int rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)          rc->overflow = 0;
1324            rc->KFoverflow = 0;
1325            rc->KFoverflow_partial = 0;
1326            rc->KF_idx = 0;
1327            rc->desired_total = 0;
1328            rc->real_total = 0;
1329    
1330            /* Job done */
1331            return;
1332    }
1333    
1334    /*****************************************************************************
1335     * Still more low level stuff (nothing to do with stats treatment)
1336     ****************************************************************************/
1337    
1338    /* This function returns an allocated string containing a complete line read
1339     * from the file starting at the current position */
1340    static char *
1341    readline(FILE *f)
1342  {  {
1343      stat_t * s = &rc->stats[data->frame_num];          char *buffer = NULL;
1344            int buffer_size = 0;
1345            int pos = 0;
1346    
1347      if (data->frame_num >= rc->num_frames) {          do {
1348          /* insufficent stats data */                  int c;
         return 0;  
     }  
1349    
1350      rc->quant_count[data->quant]++;                  /* Read a character from the stream */
1351                    c = fgetc(f);
1352    
1353      if (data->type == XVID_TYPE_IVOP) {                  /* Is that EOF or new line ? */
1354          int kfdiff = (rc->keyframe_locations[rc->KF_idx] -      rc->keyframe_locations[rc->KF_idx - 1]);                  if(c == EOF || c == '\n')
1355                            break;
         rc->overflow += rc->KFoverflow;  
         rc->KFoverflow = s->desired_length - data->length;  
1356    
1357          if (kfdiff > 1) {  // non-consecutive keyframes                  /* Do we have to update buffer ? */
1358              rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);                  if(pos >= buffer_size - 1) {
1359          }else{ // consecutive keyframes                          buffer_size += BUF_SZ;
1360                          rc->overflow += rc->KFoverflow;                          buffer = (char*)realloc(buffer, buffer_size);
1361                          rc->KFoverflow = 0;                          if (buffer == NULL)
1362                          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;  
1363      }      }
1364    
1365      DPRINTF(XVID_DEBUG_RC, "[%i] quant:%i stats1:%i scaled:%i actual:%i overflow:%i\n",                  buffer[pos] = c;
1366          data->frame_num,                  pos++;
1367          data->quant,          } while(1);
         s->length,  
         s->scaled_length,  
         data->length,  
         rc->overflow);  
1368    
1369      return(0);          /* Read \n or EOF */
1370            if (buffer == NULL) {
1371                    /* EOF, so we reached the end of the file, return NULL */
1372                    if(feof(f))
1373                            return(NULL);
1374    
1375                    /* Just an empty line with just a newline, allocate a 1 byte buffer to
1376                     * store a zero length string */
1377                    buffer = (char*)malloc(1);
1378                    if(buffer == NULL)
1379                            return(NULL);
1380  }  }
1381    
1382            /* Zero terminated string */
1383            buffer[pos] = '\0';
1384    
1385            return(buffer);
1386    }
1387    
1388  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
1389     * string */
1390    static char *
1391    skipspaces(char *string)
1392  {  {
1393      switch(opt)          const char spaces[] =
1394      {      {
1395      case XVID_PLG_INFO :                          ' ','\t','\0'
1396          return 0;                  };
1397            const char *spacechar = spaces;
1398    
1399            if (string == NULL) return(NULL);
1400    
1401            while (*string != '\0') {
1402                    /* Test against space chars */
1403                    while (*spacechar != '\0') {
1404                            if (*string == *spacechar) {
1405                                    string++;
1406                                    spacechar = spaces;
1407                                    break;
1408                            }
1409                            spacechar++;
1410                    }
1411    
1412      case XVID_PLG_CREATE :                  /* No space char */
1413          return rc_2pass2_create((xvid_plg_create_t*)param1, param2);                  if (*spacechar == '\0') return(string);
1414            }
1415    
1416      case XVID_PLG_DESTROY :          return(string);
1417          return rc_2pass2_destroy((rc_2pass2_t*)handle, (xvid_plg_destroy_t*)param1);  }
1418    
1419      case XVID_PLG_BEFORE :  /* This function returns a boolean that tells if the string is only a
1420          return rc_2pass2_before((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);   * comment */
1421    static int
1422    iscomment(char *string)
1423    {
1424            const char comments[] =
1425                    {
1426                            '#',';', '%', '\0'
1427                    };
1428            const char *cmtchar = comments;
1429            int iscomment = 0;
1430    
1431            if (string == NULL) return(1);
1432    
1433            string = skipspaces(string);
1434    
1435            while(*cmtchar != '\0') {
1436                    if(*string == *cmtchar) {
1437                            iscomment = 1;
1438                            break;
1439                    }
1440                    cmtchar++;
1441            }
1442    
1443      case XVID_PLG_AFTER :          return(iscomment);
         return rc_2pass2_after((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);  
1444      }      }
1445    
1446      return XVID_ERR_FAIL;  #if 0
1447    static void
1448    stats_print(rc_2pass2_t * rc)
1449    {
1450            int i;
1451            const char frame_type[4] = { 'i', 'p', 'b', 's'};
1452    
1453            for (i=0; i<rc->num_frames; i++) {
1454                    twopass_stat_t *s = &rc->stats[i];
1455                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- frame:%d type:%c quant:%d stats:%d scaled:%d desired:%d actual:%d overflow(%c):%.2f\n",
1456                                    i, frame_type[s->type-1], -1, s->length, s->scaled_length,
1457                                    s->desired_length, -1, frame_type[s->type-1], -1.0f);
1458  }  }
1459    }
1460    #endif
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