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revision 1.1.2.1, Tue Mar 25 10:58:33 2003 UTC revision 1.10, Tue Nov 16 14:42:07 2010 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 Benjamin Lambert <foxer@hotmail.com>
7     *                     2002 Dirk Knop <dknop@gwdg.de>
8     *                2002-2003 Edouard Gomez <ed.gomez@free.fr>
9     *                     2003 Pete Ross <pross@xvid.org>
10   *   *
11   * The curve treatment algorithm is the one implemented by Foxer <email?> and   *  This curve treatment algorithm is the one originally implemented by Foxer
12   * Dirk Knop <dknop@gwdg.de> for the XviD vfw dynamic library.   *  and tuned by Dirk Knop for the Xvid vfw frontend.
13   *   *
14   * This program is free software; you can redistribute it and/or modify   * This program is free software; you can redistribute it and/or modify
15   * it under the terms of the GNU General Public License as published by   * it under the terms of the GNU General Public License as published by
# Line 26  Line 29 
29   *   *
30   *****************************************************************************/   *****************************************************************************/
31    
32    #define BQUANT_PRESCALE
33    #undef COMPENSATE_FORMULA
34    
35    /* forces second pass not to be bigger than first */
36    #undef PASS_SMALLER
37    
38    /* automatically alters overflow controls (strength and improvement/degradation)
39            to fight most common problems without user's knowladge */
40    #define SMART_OVERFLOW_SETTING
41    
42  #include <stdio.h>  #include <stdio.h>
43  #include <math.h>  #include <math.h>
44    #include <limits.h>
 #define RAD2DEG 57.295779513082320876798154814105  
 #define DEG2RAD 0.017453292519943295769236907684886  
45    
46  #include "../xvid.h"  #include "../xvid.h"
47  #include "../image/image.h"  #include "../image/image.h"
48    
49    /*****************************************************************************
50     * Some default settings
51     ****************************************************************************/
52    
53    #define DEFAULT_KEYFRAME_BOOST 0
54    #define DEFAULT_OVERFLOW_CONTROL_STRENGTH 10
55    #define DEFAULT_CURVE_COMPRESSION_HIGH 0
56    #define DEFAULT_CURVE_COMPRESSION_LOW 0
57    #define DEFAULT_MAX_OVERFLOW_IMPROVEMENT 10
58    #define DEFAULT_MAX_OVERFLOW_DEGRADATION 10
59    
60    /* Keyframe settings */
61    #define DEFAULT_KFREDUCTION 20
62    #define DEFAULT_KFTHRESHOLD 1
63    
64    /*****************************************************************************
65     * Some default constants (can be tuned)
66     ****************************************************************************/
67    
68    /* Specify the invariant part of the headers bits (header+MV)
69     * as  hlength/cst */
70    #define INVARIANT_HEADER_PART_IVOP 1 /* factor 1.0f   */
71    #define INVARIANT_HEADER_PART_PVOP 2 /* factor 0.5f   */
72    #define INVARIANT_HEADER_PART_BVOP 8 /* factor 0.125f */
73    
74    /*****************************************************************************
75     * Structures
76     ****************************************************************************/
77    
78    /* Statistics */
79  typedef struct {  typedef struct {
80      int type;               /* first pass type */      int type;               /* first pass type */
81      int quant;              /* first pass quant */      int quant;              /* first pass quant */
82            int blks[3];            /* k,m,y blks */
83      int length;             /* first pass length */      int length;             /* first pass length */
84            int invariant;          /* what we assume as being invariant between the two passes, it's a sub part of header + MV bits */
85      int scaled_length;     /* scaled length */      int scaled_length;     /* scaled length */
86      int desired_length;          int desired_length;     /* desired length; calculated during encoding */
87  } stat_t;          int error;
   
88    
89            int zone_mode;   /* XVID_ZONE_xxx */
90            double weight;
91    } twopass_stat_t;
92    
93    /* Context struct */
 /* context struct */  
94  typedef struct  typedef struct
95  {  {
96      xvid_plugin_2pass2_t param;      xvid_plugin_2pass2_t param;
97    
98      /* constant statistical data */          /*----------------------------------
99             * constant statistical data
100             *--------------------------------*/
101    
102            /* Number of frames of the sequence */
103      int num_frames;      int num_frames;
104    
105            /* Number of Intra frames of the sequence */
106      int num_keyframes;      int num_keyframes;
107    
108      int count[3];   /* count of each frame types */          /* Target filesize to reach */
109      uint64_t tot_length[3];  /* total length of each frame types */          uint64_t target;
     double avg_length[3];   /* avg */  
     int min_length[3];  /* min frame length of each frame types */  
     uint64_t tot_scaled_length[3];  /* total scaled length of each frame type */  
     int max_length;     /* max frame size */  
   
     double curve_comp_scale;  
     double movie_curve;  
   
         double alt_curve_low;  
         double alt_curve_high;  
         double alt_curve_low_diff;  
         double alt_curve_high_diff;  
     double alt_curve_curve_bias_bonus;  
         double alt_curve_mid_qual;  
         double alt_curve_qual_dev;  
110    
111      /* dynamic */          /* Count of each frame types */
112            int count[3];
113    
114            /* Total length of each frame types (1st pass) */
115            uint64_t tot_length[3];
116            uint64_t tot_invariant[3];
117    
118            /* Average length of each frame types (used first for 1st pass data and
119             * then for scaled averages */
120            double avg_length[3];
121    
122            /* Minimum frame length allowed for each frame type */
123            int min_length[3];
124    
125            /* Total bytes per frame type once the curve has been scaled
126             * NB: advanced parameters do not change this value. This field
127             *     represents the total scaled w/o any advanced settings */
128            uint64_t tot_scaled_length[3];
129    
130            /* Maximum observed frame size observed during the first pass, the RC
131             * will try tp force all frame sizes in the second pass to be under that
132             * limit */
133            int max_length;
134    
135            /*----------------------------------
136             * Zones statistical data
137             *--------------------------------*/
138    
139            /* Total length used by XVID_ZONE_QUANT zones */
140            uint64_t tot_quant;
141            uint64_t tot_quant_invariant;
142    
143            /* Holds the total amount of frame bytes, zone weighted (only scalable
144             * part of frame bytes) */
145            uint64_t tot_weighted;
146    
147            /*----------------------------------
148             * Advanced settings helper ratios
149             *--------------------------------*/
150    
151            /* This the ratio that has to be applied to all p/b frames in order
152             * to reserve/retrieve bits for/from keyframe boosting and consecutive
153             * keyframe penalty */
154            double pb_iboost_tax_ratio;
155    
156            /* This the ratio to apply to all b/p frames in order to respect the
157             * assymetric curve compression while respecting a target filesize
158             * NB: The assymetric delta gain has to be computed before this ratio
159             *     is applied, and then the delta is added to the scaled size */
160            double assymetric_tax_ratio;
161    
162            /*----------------------------------
163             * Data from the stats file kept
164             * into RAM for easy access
165             *--------------------------------*/
166    
167            /* Array of keyframe locations
168             * eg: rc->keyframe_locations[100] returns the frame number of the 100th
169             *     keyframe */
170      int * keyframe_locations;      int * keyframe_locations;
     stat_t * stats;  
171    
172      double pquant_error[32];          /* Index of the last keyframe used in the keyframe_location */
173      double bquant_error[32];          int KF_idx;
174      int quant_count[32];  
175            /* Array of all 1st pass data file -- see the twopass_stat_t structure
176             * definition for more details */
177            twopass_stat_t * stats;
178    
179            /*----------------------------------
180             * Hysteresis helpers
181             *--------------------------------*/
182    
183            /* This field holds the int2float conversion errors of each quant per
184             * frame type, this allow the RC to keep track of rouding error and thus
185             * increase or decrease the chosen quant according to this residue */
186            double quant_error[3][32];
187    
188            /* This fields stores the count of each quant usage per frame type
189             * No real role but for debugging */
190            int quant_count[3][32];
191    
192            /* Last valid quantizer used per frame type, it allows quantizer
193             * increament/decreament limitation in order to avoid big image quality
194             * "jumps" */
195      int last_quant[3];      int last_quant[3];
196    
197      double curve_comp_error;          /*----------------------------------
198      int overflow;           * Overflow control
199      int KFoverflow;           *--------------------------------*/
     int KFoverflow_partial;  
     int KF_idx;  
 } rc_2pass2_t;  
200    
201            /* Current overflow that has to be distributed to p/b frames */
202            double overflow;
203    
204            /* Total overflow for keyframes -- not distributed directly */
205            double KFoverflow;
206    
207  #define BUF_SZ 1024          /* Amount of keyframe overflow to introduce to the global p/b frame
208  #define MAX_COLS    5           * overflow counter at each encoded frame */
209            double KFoverflow_partial;
210    
211            /* Unknown ???
212             * ToDo: description */
213            double fq_error;
214    
215  /* open stats file, and count num frames */          int min_quant; /* internal minimal quant, prevents wrong quants from being used */
216    
217  static int det_stats_length(rc_2pass2_t * rc, char * filename)          /*----------------------------------
218  {           * Debug
219      FILE * f;           *--------------------------------*/
220      int n, ignore;          double desired_total;
221      char type;          double real_total;
222    
223      rc->num_frames = 0;          int scaled_frames;
224      rc->num_keyframes = 0;  } rc_2pass2_t;
225    
226      if ((f = fopen(filename, "rt")) == NULL)  
227    /*****************************************************************************
228     * Sub plugin functions prototypes
229     ****************************************************************************/
230    
231    static int rc_2pass2_create(xvid_plg_create_t * create, rc_2pass2_t ** handle);
232    static int rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data);
233    static int rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data);
234    static int rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy);
235    
236    /*****************************************************************************
237     * Plugin definition
238     ****************************************************************************/
239    
240    int
241    xvid_plugin_2pass2(void * handle, int opt, void * param1, void * param2)
242    {
243            switch(opt) {
244            case XVID_PLG_INFO :
245            case XVID_PLG_FRAME :
246          return 0;          return 0;
247    
248      while((n = fscanf(f, "%c %d %d %d %d %d\n",          case XVID_PLG_CREATE :
249          &type, &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++;  
         }  
     }  
250    
251      fclose(f);          case XVID_PLG_DESTROY :
252                    return rc_2pass2_destroy((rc_2pass2_t*)handle, (xvid_plg_destroy_t*)param1);
253    
254            case XVID_PLG_BEFORE :
255                    return rc_2pass2_before((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);
256    
257            case XVID_PLG_AFTER :
258                    return rc_2pass2_after((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);
259            }
260    
261      return 1;          return XVID_ERR_FAIL;
262  }  }
263    
264    /*****************************************************************************
265     * Sub plugin functions definitions
266     ****************************************************************************/
267    
268    /* First a few local helping function prototypes */
269    static  int statsfile_count_frames(rc_2pass2_t * rc, char * filename);
270    static  int statsfile_load(rc_2pass2_t *rc, char * filename);
271    static void zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create);
272    static void first_pass_stats_prepare_data(rc_2pass2_t * rc);
273    static void first_pass_scale_curve_internal(rc_2pass2_t *rc);
274    static void scaled_curve_apply_advanced_parameters(rc_2pass2_t * rc);
275    static  int check_curve_for_vbv_compliancy(rc_2pass2_t * rc, const float fps);
276    static  int scale_curve_for_vbv_compliancy(rc_2pass2_t * rc, const float fps);
277    #if 0
278    static void stats_print(rc_2pass2_t * rc);
279    #endif
280    
281  /* open stats file(s) and read into rc->stats array */  /*----------------------------------------------------------------------------
282     *--------------------------------------------------------------------------*/
283    
284  static int load_stats(rc_2pass2_t *rc, char * filename1, char * filename2)  static int
285    rc_2pass2_create(xvid_plg_create_t * create, rc_2pass2_t **handle)
286  {  {
287      FILE * f1, *f2;          xvid_plugin_2pass2_t * param = (xvid_plugin_2pass2_t *)create->param;
288            rc_2pass2_t * rc;
289      int i;      int i;
290    
291            rc = malloc(sizeof(rc_2pass2_t));
292            if (rc == NULL)
293                    return XVID_ERR_MEMORY;
294    
295      if ((f1 = fopen(filename1, "rt"))==NULL)          /* v1.0.x */
296          return 0;          rc->param.version = param->version;
297            rc->param.bitrate = param->bitrate;
298            rc->param.filename = param->filename;
299            rc->param.keyframe_boost = param->keyframe_boost;
300            rc->param.curve_compression_high = param->curve_compression_high;
301            rc->param.curve_compression_low = param->curve_compression_low;
302            rc->param.overflow_control_strength = param->overflow_control_strength;
303            rc->param.max_overflow_improvement = param->max_overflow_improvement;
304            rc->param.max_overflow_degradation = param->max_overflow_degradation;
305            rc->param.kfreduction = param->kfreduction;
306            rc->param.kfthreshold = param->kfthreshold;
307            rc->param.container_frame_overhead = param->container_frame_overhead;
308    
309            if (XVID_VERSION_MINOR(param->version) >= 1) {
310                    rc->param.vbv_size = param->vbv_size;
311                    rc->param.vbv_initial = param->vbv_initial;
312                    rc->param.vbv_maxrate = param->vbv_maxrate;
313                    rc->param.vbv_peakrate = param->vbv_peakrate;
314            }else{
315                    rc->param.vbv_size =
316                    rc->param.vbv_initial =
317                    rc->param.vbv_maxrate =
318                    rc->param.vbv_peakrate = 0;
319            }
320    
321            /* Initialize all defaults */
322    #define _INIT(a, b) if((a) <= 0) (a) = (b)
323            /* Let's set our defaults if needed */
324            _INIT(rc->param.keyframe_boost, DEFAULT_KEYFRAME_BOOST);
325            _INIT(rc->param.overflow_control_strength, DEFAULT_OVERFLOW_CONTROL_STRENGTH);
326            _INIT(rc->param.curve_compression_high, DEFAULT_CURVE_COMPRESSION_HIGH);
327            _INIT(rc->param.curve_compression_low, DEFAULT_CURVE_COMPRESSION_LOW);
328            _INIT(rc->param.max_overflow_improvement, DEFAULT_MAX_OVERFLOW_IMPROVEMENT);
329            _INIT(rc->param.max_overflow_degradation,  DEFAULT_MAX_OVERFLOW_DEGRADATION);
330    
331            /* Keyframe settings */
332            _INIT(rc->param.kfreduction, DEFAULT_KFREDUCTION);
333            _INIT(rc->param.kfthreshold, DEFAULT_KFTHRESHOLD);
334    #undef _INIT
335    
336      if ((f2 = fopen(filename2, "rt"))==NULL) {          /* Initialize some stuff to zero */
337          fclose(f1);          for(i=0; i<3; i++) {
338          return 0;                  int j;
339                    for (j=0; j<32; j++) {
340                            rc->quant_error[i][j] = 0;
341                            rc->quant_count[i][j] = 0;
342                    }
343      }      }
344    
345      i = 0;          for (i=0; i<3; i++) rc->last_quant[i] = 0;
     while(i < rc->num_frames) {  
         stat_t * s = &rc->stats[i];  
         int n, ignore;  
         char type;  
346    
347          n = fscanf(f1, "%c %d %d %d %d %d\n", &type, &s->quant, &s->length, &ignore, &ignore, &ignore);          rc->fq_error = 0;
348          if (n == EOF) break;          rc->min_quant = 1;
349            rc->scaled_frames = 0;
350    
351          if (type == 'i') {          /* Count frames (and intra frames) in the stats file, store the result into
352              s->type = XVID_TYPE_IVOP;           * the rc structure */
353          }else if (type == 'p' || type == 's') {          if (statsfile_count_frames(rc, param->filename) == -1) {
354              s->type = XVID_TYPE_PVOP;                  DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- ERROR: fopen %s failed\n", param->filename);
355          }else if (type == 'b') {                  free(rc);
356              s->type = XVID_TYPE_BVOP;                  return(XVID_ERR_FAIL);
         }else{  /* unknown type */  
             printf("unk\n");  
             continue;  
357          }          }
358    
359          n = fscanf(f2, "%c %d %d %d %d %d\n", &type, &ignore, &s->scaled_length, &ignore, &ignore, &ignore);          /* Allocate the stats' memory */
360          if (n == EOF) break;          if ((rc->stats = malloc(rc->num_frames * sizeof(twopass_stat_t))) == NULL) {
361          if (type != 'i'&& type != 'p' && type != 'b' && type != 's') {                  free(rc);
362              printf("unk\n");                  return(XVID_ERR_MEMORY);
             continue; /* unknown type */  
363          }          }
364    
365          i++;          /* Allocate keyframes location's memory
366             * PS: see comment in pre_process0 for the +1 location requirement */
367            rc->keyframe_locations = malloc((rc->num_keyframes + 1) * sizeof(int));
368            if (rc->keyframe_locations == NULL) {
369                    free(rc->stats);
370                    free(rc);
371                    return(XVID_ERR_MEMORY);
372      }      }
     rc->num_frames = i;  
   
373    
374      fclose(f1);          /* Load the first pass stats */
375      if (filename2)          if (statsfile_load(rc, param->filename) == -1) {
376          fclose(f2);                  DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- ERROR: fopen %s failed\n", param->filename);
377                    free(rc->keyframe_locations);
378                    free(rc->stats);
379                    free(rc);
380                    return XVID_ERR_FAIL;
381            }
382    
383      return 1;          /* Compute the target filesize */
384            if (rc->param.bitrate<0) {
385                    /* if negative, bitrate equals the target (in kbytes) */
386                    rc->target = ((uint64_t)(-rc->param.bitrate)) * 1024;
387            } else if (rc->num_frames  < create->fbase/create->fincr) {
388                    /* Source sequence is less than 1s long, we do as if it was 1s long */
389                    rc->target = rc->param.bitrate / 8;
390            } else {
391                    /* Target filesize = bitrate/8 * numframes / framerate */
392                    rc->target =
393                            ((uint64_t)rc->param.bitrate * (uint64_t)rc->num_frames * \
394                             (uint64_t)create->fincr) / \
395                            ((uint64_t)create->fbase * 8);
396            }
397    
398            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Frame rate: %d/%d (%ffps)\n",
399                            create->fbase, create->fincr,
400                            (double)create->fbase/(double)create->fincr);
401            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Number of frames: %d\n", rc->num_frames);
402            if(rc->param.bitrate>=0)
403                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Target bitrate: %ld\n", rc->param.bitrate);
404            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Target filesize: %lld\n", rc->target);
405    
406            /* Compensate the average frame overhead caused by the container */
407            rc->target -= rc->num_frames*rc->param.container_frame_overhead;
408            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Container Frame overhead: %d\n", rc->param.container_frame_overhead);
409            if(rc->param.container_frame_overhead)
410                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- New target filesize after container compensation: %lld\n", rc->target);
411    
412            /* When bitrate is not given it means it has been scaled by an external
413             * application */
414            if (rc->param.bitrate) {
415                    /* Apply zone settings
416                     * - set rc->tot_quant which represents the total num of bytes spent in
417                     *   fixed quant zones
418                     * - set rc->tot_weighted which represents the total amount of bytes
419                     *   spent in normal or weighted zones in first pass (normal zones can
420                     *   be considered weight=1)
421                     * - set rc->tot_quant_invariant which represents the total num of bytes
422                     *   spent in fixed quant zones for headers */
423                    zone_process(rc, create);
424            } else {
425                    /* External scaling -- zones are ignored */
426                    for (i=0;i<rc->num_frames;i++) {
427                            rc->stats[i].zone_mode = XVID_ZONE_WEIGHT;
428                            rc->stats[i].weight = 1.0;
429                    }
430                    rc->tot_quant = 0;
431  }  }
432    
433            /* Gathers some information about first pass stats:
434             *  - finds the minimum frame length for each frame type during 1st pass.
435             *     rc->min_size[]
436             *  - determines the maximum frame length observed (no frame type distinction).
437             *     rc->max_size
438             *  - count how many times each frame type has been used.
439             *     rc->count[]
440             *  - total bytes used per frame type
441             *     rc->tot_length[]
442             *  - total bytes considered invariant between the 2 passes
443             *  - store keyframe location
444             *     rc->keyframe_locations[]
445             */
446            first_pass_stats_prepare_data(rc);
447    
448  /*static void internal_scale(rc_2pass2_t *rc)          /* If we have a user bitrate, it means it's an internal curve scaling */
449  {          if (rc->param.bitrate) {
450      const double avg_pvop = rc->avg_length[XVID_TYPE_PVOP-1];                  /* Perform internal curve scaling */
451      const double avg_bvop = rc->avg_length[XVID_TYPE_BVOP-1];                  first_pass_scale_curve_internal(rc);
452      const uint64_t tot_pvop = rc->tot_length[XVID_TYPE_PVOP-1];          }
     const uint64_t tot_bvop = rc->tot_length[XVID_TYPE_BVOP-1];  
     uint64_t i_total = 0;  
         double total1,total2;  
     int i;  
453    
454      for (i=0; i<rc->num_frames; i++) {          /* Apply advanced curve options, and compute some parameters in order to
455          stat_t * s = &rc->stats[i];           * shape the curve in the BEFORE/AFTER pair of functions */
456            scaled_curve_apply_advanced_parameters(rc);
457    
458                  if (s->type == XVID_TYPE_IVOP) {          /* Check curve for VBV compliancy and rescale if necessary */
459                          i_total += s->length + s->length * rc->param.keyframe_boost / 100;  #ifdef VBV_FORCE
460          }          if (rc->param.vbv_size==0) {
461                    rc->param.vbv_size      =  3145728;
462                    rc->param.vbv_initial   =  2359296;
463                    rc->param.vbv_maxrate   =  4854000;
464                    rc->param.vbv_peakrate  =  8000000;
465          }          }
466    #endif
467    
468          // compensate for avi frame overhead          /* vbv_size==0 switches VBV check off */
469          rc->target_size -= rc->num_frames * 24;          if (rc->param.vbv_size > 0)  {
470                    const double fps = (double)create->fbase/(double)create->fincr;
471                    int status = check_curve_for_vbv_compliancy(rc, fps);
472    
473          // perform prepass to compensate for over/undersizing                  if (status) {
474                            DPRINTF(XVID_DEBUG_RC, "[xvid rc] Underflow detected - Scaling Curve for compliancy.\n");
475                    }
476    
477          if (rc->param.use_alt_curve) {                  status = scale_curve_for_vbv_compliancy(rc, fps);
478    
479          rc->alt_curve_low = avg_pvop - avg_pvop * (double)rc->param.alt_curve_low_dist / 100.0;                  if (status == 0) {
480                  rc->alt_curve_low_diff = avg_pvop - rc->alt_curve_low;                          DPRINTF(XVID_DEBUG_RC, "[xvid rc] VBV compliant curve scaling done.\n");
                 rc->alt_curve_high = avg_pvop + avg_pvop * (double)rc->param.alt_curve_high_dist / 100.0;  
                 rc->alt_curve_high_diff = rc->alt_curve_high - avg_pvop;  
                 if (rc->alt_curve_use_auto) {  
                         if (rc->movie_curve > 1.0) {  
                                 rc->param.alt_curve_min_rel_qual = (int)(100.0 - (100.0 - 100.0 / rc->movie_curve) * (double)rc->param.alt_curve_auto_str / 100.0);  
                                 if (rc->param.alt_curve_min_rel_qual < 20)  
                                         rc->param.alt_curve_min_rel_qual = 20;  
481              }else{              }else{
482                                  rc->param.alt_curve_min_rel_qual = 100;                          DPRINTF(XVID_DEBUG_RC, "[xvid rc] VBV compliant curve scaling impossible.\n");
483              }              }
484                  }                  }
485                  rc->alt_curve_mid_qual = (1.0 + (double)rc->param.alt_curve_min_rel_qual / 100.0) / 2.0;          *handle = rc;
486                  rc->alt_curve_qual_dev = 1.0 - rc->alt_curve_mid_qual;          return(0);
487    }
488    
489                  if (rc->param.alt_curve_low_dist > 100) {  /*----------------------------------------------------------------------------
490                          switch(rc->param.alt_curve_type) {   *--------------------------------------------------------------------------*/
491                          case XVID_CURVE_SINE : // Sine Curve (high aggressiveness)  
492                                  rc->alt_curve_qual_dev *= 2.0 / (1.0 + sin(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff)));  static int
493                                  rc->alt_curve_mid_qual = 1.0 - rc->alt_curve_qual_dev * sin(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff));  rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy)
494                                  break;  {
495                          case XVID_CURVE_LINEAR : // Linear (medium aggressiveness)          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- target_total:%lld desired_total:%.2f (%.2f%%) actual_total:%.2f (%.2f%%)\n",
496                                  rc->alt_curve_qual_dev *= 2.0 / (1.0 + avg_pvop / rc->alt_curve_low_diff);                          rc->target,
497                                  rc->alt_curve_mid_qual = 1.0 - rc->alt_curve_qual_dev * avg_pvop / rc->alt_curve_low_diff;                          rc->desired_total,
498                                  break;                          100*rc->desired_total/(double)rc->target,
499                          case XVID_CURVE_COSINE : // Cosine Curve (low aggressiveness)                          rc->real_total,
500                                  rc->alt_curve_qual_dev *= 2.0 / (1.0 +  (1.0 - cos(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff))));                          100*rc->real_total/(double)rc->target);
501                                  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)));  
502            free(rc->keyframe_locations);
503            free(rc->stats);
504            free(rc);
505            return(0);
506                          }                          }
507    
508    /*----------------------------------------------------------------------------
509     *--------------------------------------------------------------------------*/
510    
511    static int
512    rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)
513    {
514            twopass_stat_t * s = &rc->stats[data->frame_num];
515            double dbytes;
516            double scaled_quant;
517            double overflow;
518            int capped_to_max_framesize = 0;
519    
520            /* This function is quite long but easy to understand. In order to simplify
521             * the code path (a bit), we treat 3 cases that can return immediatly. */
522    
523            /* First case: Another plugin has already set a quantizer */
524            if (data->quant > 0)
525                    return(0);
526    
527            /* Second case: insufficent stats data
528             * We can't guess much what we should do, let core decide all alone */
529            if (data->frame_num >= rc->num_frames) {
530                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- stats file too short (now processing frame %d)",
531                            data->frame_num);
532                    return(0);
533                  }                  }
534    
535            /* Third case: We are in a Quant zone
536             * Quant zones must just ensure we use the same settings as first pass
537             * So set the quantizer and the type */
538            if (s->zone_mode == XVID_ZONE_QUANT) {
539                    /* Quant stuff */
540                    rc->fq_error += s->weight;
541                    data->quant = (int)rc->fq_error;
542                    rc->fq_error -= data->quant;
543    
544                    /* The type stuff */
545                    data->type = s->type;
546    
547                    /* The only required data for AFTER step is this one for the overflow
548                     * control */
549                    s->desired_length = s->length;
550    
551                    return(0);
552          }          }
553    
         total1 = 0;  
         total2 = 0;  
554    
555      for (i=0; i<rc->num_frames; i++) {          /*************************************************************************/
556          stat_t * s = &rc->stats[i];          /*************************************************************************/
557            /*************************************************************************/
558    
559                  if (s->type != XVID_TYPE_IVOP) {          /*-------------------------------------------------------------------------
560             * Frame bit allocation first part
561             *
562             * First steps apply user settings, just like it is done in the theoritical
563             * scaled_curve_apply_advanced_parameters
564             *-----------------------------------------------------------------------*/
565    
566              double dbytes = s->length / rc->movie_curve;          /* Set desired to what we are wanting to obtain for this frame */
567              double dbytes2;          dbytes = (double)s->scaled_length;
                         total1 += dbytes;  
568    
569                          if (s->type == XVID_TYPE_BVOP)          /* IFrame user settings*/
570                                  dbytes *= avg_pvop / avg_bvop;          if (s->type == XVID_TYPE_IVOP) {
571                    /* Keyframe boosting -- All keyframes benefit from it */
572                    dbytes += dbytes*rc->param.keyframe_boost / 100;
573    
574                          if (rc->param.use_alt_curve) {  #if 0 /* ToDo: decide how to apply kfthresholding */
575                                  if (dbytes > avg_pvop) {  #endif
                     if (dbytes >= rc->alt_curve_high) {  
                                                 dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev);  
                     }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 - avg_pvop) * 90.0 / rc->alt_curve_high_diff)));  
                                                         break;  
                                                 case XVID_CURVE_LINEAR :  
                                                     dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - avg_pvop) / rc->alt_curve_high_diff);  
                                                         break;  
                                                 case XVID_CURVE_COSINE :  
                                                     dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * ((dbytes - avg_pvop) * 90.0 / rc->alt_curve_high_diff))));  
                                                 }  
                                         }  
576                                  }else{                                  }else{
577                      if (dbytes <= rc->alt_curve_low){  
578                                                  dbytes2 = dbytes;                  /* P/S/B frames must reserve some bits for iframe boosting */
579                      }else{                  dbytes *= rc->pb_iboost_tax_ratio;
580                                                  switch(rc->param.alt_curve_type){  
581                                                  case XVID_CURVE_SINE :                  /* Apply assymetric curve compression */
582                                                      dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * sin(DEG2RAD * ((dbytes - avg_pvop) * 90.0 / rc->alt_curve_low_diff)));                  if (rc->param.curve_compression_high || rc->param.curve_compression_low) {
583                                                          break;                          double assymetric_delta;
584                                                  case XVID_CURVE_LINEAR :  
585                                                      dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - avg_pvop) / rc->alt_curve_low_diff);                          /* Compute the assymetric delta, this is computed before applying
586                                                          break;                           * the tax, as done in the pre_process function */
587                                                  case XVID_CURVE_COSINE :                          if (dbytes > rc->avg_length[s->type-1])
588                                                      dbytes2 = dbytes * (rc->alt_curve_mid_qual + rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * ((dbytes - avg_pvop) * 90.0 / rc->alt_curve_low_diff))));                                  assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_high / 100.0;
589                            else
590                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_low  / 100.0;
591    
592                            /* Now we must apply the assymetric tax, else our curve compression
593                             * would not give a theoritical target size equal to what it is
594                             * expected */
595                            dbytes *= rc->assymetric_tax_ratio;
596    
597                            /* Now we can add the assymetric delta */
598                            dbytes += assymetric_delta;
599                                                  }                                                  }
600                                          }                                          }
601    
602            /* That is what we would like to have -- Don't put that chunk after
603             * overflow control, otherwise, overflow is counted twice and you obtain
604             * half sized bitrate sequences */
605            s->desired_length  = (int)dbytes;
606            rc->desired_total += dbytes;
607    
608            /*------------------------------------------------------------------------
609             * Frame bit allocation: overflow control part.
610             *
611             * Unlike the theoritical scaled_curve_apply_advanced_parameters, here
612             * it's real encoding and we need to make sure we don't go so far from
613             * what is our ideal scaled curve.
614             *-----------------------------------------------------------------------*/
615    
616            /* Compute the overflow we should compensate */
617            if (s->type != XVID_TYPE_IVOP || rc->overflow > 0) {
618                    double frametype_factor;
619                    double framesize_factor;
620    
621                    /* Take only the desired part of overflow */
622                    overflow = rc->overflow;
623    
624                    /* Factor that will take care to decrease the overflow applied
625                     * according to the importance of this frame type in term of
626                     * overall size */
627                    frametype_factor  = rc->count[XVID_TYPE_IVOP-1]*rc->avg_length[XVID_TYPE_IVOP-1];
628                    frametype_factor += rc->count[XVID_TYPE_PVOP-1]*rc->avg_length[XVID_TYPE_PVOP-1];
629                    frametype_factor += rc->count[XVID_TYPE_BVOP-1]*rc->avg_length[XVID_TYPE_BVOP-1];
630                    frametype_factor /= rc->count[s->type-1]*rc->avg_length[s->type-1];
631                    frametype_factor  = 1/frametype_factor;
632    
633                    /* Factor that will take care not to compensate too much for this frame
634                     * size */
635                    framesize_factor  = dbytes;
636                    framesize_factor /= rc->avg_length[s->type-1];
637    
638                    /* Treat only the overflow part concerned by this frame type and size */
639                    overflow *= frametype_factor;
640    #if 0
641                    /* Leave this one alone, as it impacts badly on quality */
642                    overflow *= framesize_factor;
643    #endif
644    
645                    /* Apply the overflow strength imposed by the user */
646                    overflow *= (rc->param.overflow_control_strength/100.0f);
647            } else {
648                    /* no negative overflow applied in IFrames because:
649                     *  - their role is important as they're references for P/BFrames.
650                     *  - there aren't much in typical sequences, so if an IFrame overflows too
651                     *    much, this overflow may impact the next IFrame too much and generate
652                     *    a sequence of poor quality frames */
653                    overflow = 0;
654                                  }                                  }
655    
656            /* Make sure we are not trying to compensate more overflow than we even have */
657            if (fabs(overflow) > fabs(rc->overflow))
658                    overflow = rc->overflow;
659    
660            /* Make sure the overflow doesn't make the frame size to get out of the range
661             * [-max_degradation..+max_improvment] */
662            if (overflow > dbytes*rc->param.max_overflow_improvement / 100) {
663                    if(overflow <= dbytes)
664                            dbytes += dbytes * rc->param.max_overflow_improvement / 100;
665                    else
666                            dbytes += overflow * rc->param.max_overflow_improvement / 100;
667            } else if (overflow < - dbytes * rc->param.max_overflow_degradation / 100) {
668                    dbytes -= dbytes * rc->param.max_overflow_degradation / 100;
669                          }else{                          }else{
670                  if (dbytes > avg_pvop) {                  dbytes += overflow;
                                         dbytes2 = ((double)dbytes + (avg_pvop - dbytes) *  
                                                 rc->param.curve_compression_high / 100.0);  
                                 }else{  
                                         dbytes2 = ((double)dbytes + (avg_pvop - dbytes) *  
                                                 rc->param.curve_compression_low / 100.0);  
                                 }  
671                          }                          }
672    
673                          if (s->type == XVID_TYPE_BVOP) {          /*-------------------------------------------------------------------------
674                                  dbytes2 *= avg_bvop / avg_pvop;           * Frame bit allocation last part:
675             *
676             * Cap frame length so we don't reach neither bigger frame sizes than first
677             * pass nor smaller than the allowed minimum.
678             *-----------------------------------------------------------------------*/
679    
680    #ifdef PASS_SMALLER
681            if (dbytes > s->length) {
682                    dbytes = s->length;
683              }              }
684    #endif
685    
686              if (dbytes2 < rc->min_length[s->type-1]) {          /* Prevent stupid desired sizes under logical values */
687            if (dbytes < rc->min_length[s->type-1]) {
688                  dbytes = rc->min_length[s->type-1];                  dbytes = rc->min_length[s->type-1];
689              }              }
690    
691              total2 += dbytes2;          /*------------------------------------------------------------------------
692                  }           * Desired frame length <-> quantizer mapping
693          }           *-----------------------------------------------------------------------*/
694    
695    #ifdef BQUANT_PRESCALE
696            /* For bframes we prescale the quantizer to avoid too high quant scaling */
697            if(s->type == XVID_TYPE_BVOP) {
698    
699                    twopass_stat_t *b_ref = s;
700    
701          rc->curve_comp_scale = total1 / total2;                  /* Find the reference frame */
702                    while(b_ref != &rc->stats[0] && b_ref->type == XVID_TYPE_BVOP)
703                            b_ref--;
704    
705                    /* Compute the original quant */
706                    s->quant  = 2*(100*s->quant - data->bquant_offset);
707                    s->quant += data->bquant_ratio - 1; /* to avoid rounding issues */
708                    s->quant  = s->quant/data->bquant_ratio - b_ref->quant;
709            }
710    #endif
711    
712            /* Don't laugh at this very 'simple' quant<->size relationship, it
713             * proves to be acurate enough for our algorithm */
714            scaled_quant = (double)s->quant*(double)s->length/(double)dbytes;
715    
716    #ifdef COMPENSATE_FORMULA
717            /* We know xvidcore will apply the bframe formula again, so we compensate
718             * it right now to make sure we would not apply it twice */
719            if(s->type == XVID_TYPE_BVOP) {
720    
721                    twopass_stat_t *b_ref = s;
722    
723          if (!rc->param.use_alt_curve) {                  /* Find the reference frame */
724                  printf("middle frame size for asymmetric curve compression: %i",                  while(b_ref != &rc->stats[0] && b_ref->type == XVID_TYPE_BVOP)
725              (int)(avg_pvop * rc->curve_comp_scale));                          b_ref--;
726    
727                    /* Compute the quant it would be if the core did not apply the bframe
728                     * formula */
729                    scaled_quant  = 100*scaled_quant - data->bquant_offset;
730                    scaled_quant += data->bquant_ratio - 1; /* to avoid rouding issues */
731                    scaled_quant /= data->bquant_ratio;
732          }          }
733  }*/  #endif
734    
735            /* Quantizer has been scaled using floating point operations/results, we
736             * must cast it to integer */
737            data->quant = (int)scaled_quant;
738    
739            /* Let's clip the computed quantizer, if needed */
740            if (data->quant < 1) {
741                    data->quant = 1;
742            } else if (data->quant > 31) {
743                    data->quant = 31;
744            } else {
745    
746                    /* The frame quantizer has not been clipped, this appears to be a good
747                     * computed quantizer, do not loose quantizer decimal part that we
748                     * accumulate for later reuse when its sum represents a complete
749                     * unit. */
750                    rc->quant_error[s->type-1][data->quant] += scaled_quant - (double)data->quant;
751    
752                    if (rc->quant_error[s->type-1][data->quant] >= 1.0) {
753                            rc->quant_error[s->type-1][data->quant] -= 1.0;
754                            data->quant++;
755                    } else if (rc->quant_error[s->type-1][data->quant] <= -1.0) {
756                            rc->quant_error[s->type-1][data->quant] += 1.0;
757                            data->quant--;
758                    }
759            }
760    
761            /* Now we have a computed quant that is in the right quante range, with a
762             * possible +1 correction due to cumulated error. We can now safely clip
763             * the quantizer again with user's quant ranges. "Safely" means the Rate
764             * Control could learn more about this quantizer, this knowledge is useful
765             * for future frames even if it this quantizer won't be really used atm,
766             * that's why we don't perform this clipping earlier. */
767            if (data->quant < data->min_quant[s->type-1]) {
768                    data->quant = data->min_quant[s->type-1];
769            } else if (data->quant > data->max_quant[s->type-1]) {
770                    data->quant = data->max_quant[s->type-1];
771            }
772    
773            if (data->quant < rc->min_quant) data->quant = rc->min_quant;
774    
775  static void print_stats(rc_2pass2_t * rc)          /* To avoid big quality jumps from frame to frame, we apply a "security"
776  {           * rule that makes |last_quant - new_quant| <= 2. This rule only applies
777      int i;           * to predicted frames (P and B) */
778      for (i = 0; i < rc->num_frames; i++) {          if (s->type != XVID_TYPE_IVOP && rc->last_quant[s->type-1] && capped_to_max_framesize == 0) {
         stat_t * s = &rc->stats[i];  
         printf("%i %i %i %i\n", s->type, s->quant, s->length, s->scaled_length);  
779    
780                    if (data->quant > rc->last_quant[s->type-1] + 2) {
781                            data->quant = rc->last_quant[s->type-1] + 2;
782                            DPRINTF(XVID_DEBUG_RC,
783                                            "[xvid rc] -- frame %d p/b-frame quantizer prevented from rising too steeply\n",
784                                            data->frame_num);
785                    }
786                    if (data->quant < rc->last_quant[s->type-1] - 2) {
787                            data->quant = rc->last_quant[s->type-1] - 2;
788                            DPRINTF(XVID_DEBUG_RC,
789                                            "[xvid rc] -- frame:%d p/b-frame quantizer prevented from falling too steeply\n",
790                                            data->frame_num);
791      }      }
792  }  }
793    
794            /* We don't want to pollute the RC histerisis when our computed quant has
795             * been computed from a capped frame size */
796            if (capped_to_max_framesize == 0)
797                    rc->last_quant[s->type-1] = data->quant;
798    
799  /* pre-process the statistics data          /* Don't forget to force 1st pass frame type ;-) */
800      this is a clone of vfw/src/2pass.c:codec_2pass_init minus file reading, alt_curve, internal scale          if (rc->scaled_frames)
801  */                  data->type = s->type;
802    
803            rc->scaled_frames++;
804            return 0;
805    }
806    
807  void pre_process(rc_2pass2_t * rc)  /*----------------------------------------------------------------------------
808     *--------------------------------------------------------------------------*/
809    
810    static int
811    rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)
812  {  {
813      int i,j;          const char frame_type[4] = { 'i', 'p', 'b', 's'};
814      double total1, total2;          twopass_stat_t * s = &rc->stats[data->frame_num];
     uint64_t ivop_boost_total;  
815    
816      ivop_boost_total = 0;          /* Insufficent stats data */
817      rc->curve_comp_error = 0;          if (data->frame_num >= rc->num_frames)
818                    return 0;
819    
820      for (i=0; i<3; i++) {          /* Update the quantizer counter */
821          rc->count[i]=0;          rc->quant_count[s->type-1][data->quant]++;
822          rc->tot_length[i] = 0;  
823          rc->tot_scaled_length[i] = 0;          /* Update the frame type overflow */
824          rc->last_quant[i] = 0;          if (data->type == XVID_TYPE_IVOP) {
825      }                  int kfdiff = 0;
826    
827      for (i=0; i<32;i++) {                  if(rc->KF_idx != rc->num_frames -1) {
828          rc->pquant_error[i] = 0;                          kfdiff  = rc->keyframe_locations[rc->KF_idx+1];
829          rc->bquant_error[i] = 0;                          kfdiff -= rc->keyframe_locations[rc->KF_idx];
         rc->quant_count[i] = 0;  
830      }      }
831    
832      for (i=j=0; i<rc->num_frames; i++) {                  /* Flush Keyframe overflow accumulator */
833          stat_t * s = &rc->stats[i];                  rc->overflow += rc->KFoverflow;
834    
835          rc->count[s->type-1]++;                  /* Store the frame overflow to the keyframe accumulator */
836          rc->tot_length[s->type-1] += s->length;                  rc->KFoverflow = s->desired_length - data->length;
         rc->tot_scaled_length[s->type-1] += s->scaled_length;  
837    
838          if (i == 0 || s->length < rc->min_length[s->type-1]) {                  if (kfdiff > 1) {
839              rc->min_length[s->type-1] = s->length;                          /* Non-consecutive keyframes case:
840                             * We can then divide this total keyframe overflow into equal parts
841                             * that we will distribute into regular overflow at each frame
842                             * between the sequence bounded by two IFrames */
843                            rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);
844                    } else {
845                            /* Consecutive keyframes case:
846                             * Flush immediatly the keyframe overflow and reset keyframe
847                             * overflow */
848                            rc->overflow += rc->KFoverflow;
849                            rc->KFoverflow = 0;
850                            rc->KFoverflow_partial = 0;
851          }          }
852                    rc->KF_idx++;
853            } else {
854                    /* Accumulate the frame overflow */
855                    rc->overflow += s->desired_length - data->length;
856    
857          if (i == 0 || s->length > rc->max_length) {                  /* Distribute part of the keyframe overflow */
858              rc->max_length = s->length;                  rc->overflow += rc->KFoverflow_partial;
         }  
859    
860          if (s->type == XVID_TYPE_IVOP) {                  /* Don't forget to substract that same amount from the total keyframe
861              ivop_boost_total += s->scaled_length * rc->param.keyframe_boost / 100;                   * overflow */
862              rc->keyframe_locations[j] = i;                  rc->KFoverflow -= rc->KFoverflow_partial;
             j++;  
         }  
863      }      }
     rc->keyframe_locations[j] = i;  
864    
865      rc->movie_curve = ((double)(rc->tot_scaled_length[XVID_TYPE_PVOP-1] + rc->tot_scaled_length[XVID_TYPE_BVOP-1] + ivop_boost_total) /          s->error = s->desired_length - data->length;
866                                          (rc->tot_scaled_length[XVID_TYPE_PVOP-1] + rc->tot_scaled_length[XVID_TYPE_BVOP-1]));          rc->real_total += data->length;
867    
868      for(i=0; i<3; i++) {          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",
869          if (rc->count[i] == 0 || rc->movie_curve == 0) {                          data->frame_num,
870              rc->avg_length[i] = 1;                          frame_type[data->type-1],
871          }else{                          data->quant,
872              rc->avg_length[i] = rc->tot_scaled_length[i] / rc->count[i] / rc->movie_curve;                          s->length,
873          }                          s->scaled_length,
874                            s->desired_length,
875                            s->desired_length - s->error,
876                            -s->error,
877                            rc->overflow);
878    
879            return(0);
880      }      }
881    
882      printf("--\n");  /*****************************************************************************
883      /* alt curve stuff here */   * Helper functions definition
884     ****************************************************************************/
885    
886    /* Default buffer size for reading lines */
887    #define BUF_SZ   1024
888    
889    /* Helper functions for reading/parsing the stats file */
890    static char *skipspaces(char *string);
891    static int iscomment(char *string);
892    static char *readline(FILE *f);
893    
894    /* This function counts the number of frame entries in the stats file
895     * It also counts the number of I Frames */
896    static int
897    statsfile_count_frames(rc_2pass2_t * rc, char * filename)
898    {
899            FILE * f;
900            char *line;
901            int lines;
902    
903            rc->num_frames = 0;
904            rc->num_keyframes = 0;
905    
906      if (rc->param.use_alt_curve) {          if ((f = fopen(filename, "rb")) == NULL)
907          const double avg_pvop = rc->avg_length[XVID_TYPE_PVOP-1];                  return(-1);
         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];  
908    
909                  rc->alt_curve_low = avg_pvop - avg_pvop * (double)rc->param.alt_curve_low_dist / 100.0;          lines = 0;
910                  rc->alt_curve_low_diff = avg_pvop - rc->alt_curve_low;          while ((line = readline(f)) != NULL) {
                 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;  
911    
912          if (rc->param.alt_curve_use_auto) {                  char *ptr;
913              if (tot_bvop + tot_pvop > tot_scaled_bvop + tot_scaled_pvop) {                  char type;
914                                  rc->param.alt_curve_min_rel_qual = (int)(100.0 - (100.0 - 100.0 /                  int fields;
                                         ((double)(tot_pvop + tot_bvop) / (double)(tot_scaled_pvop + tot_scaled_bvop))) * (double)rc->param.alt_curve_auto_str / 100.0);  
915    
916                                  if (rc->param.alt_curve_min_rel_qual < 20)                  lines++;
917                                          rc->param.alt_curve_min_rel_qual = 20;  
918              }else{                  /* We skip spaces */
919                                  rc->param.alt_curve_min_rel_qual = 100;                  ptr = skipspaces(line);
920              }  
921                    /* Skip coment lines or empty lines */
922                    if(iscomment(ptr) || *ptr == '\0') {
923                            free(line);
924                            continue;
925          }          }
                 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;  
926    
927          if (rc->param.alt_curve_low_dist > 100) {                  /* Read the stat line from buffer */
928                          switch(rc->param.alt_curve_type) {                  fields = sscanf(ptr, "%c", &type);
929              case XVID_CURVE_SINE: // Sine Curve (high aggressiveness)  
930                                  rc->alt_curve_qual_dev *= 2.0 / (1.0 + sin(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff)));                  /* Valid stats files have at least 7 fields */
931                                  rc->alt_curve_mid_qual = 1.0 - rc->alt_curve_qual_dev * sin(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff));                  if (fields == 1) {
932                                  break;                          switch(type) {
933                          case XVID_CURVE_LINEAR: // Linear (medium aggressiveness)                          case 'i':
934                                  rc->alt_curve_qual_dev *= 2.0 / (1.0 + avg_pvop / rc->alt_curve_low_diff);                          case 'I':
935                                  rc->alt_curve_mid_qual = 1.0 - rc->alt_curve_qual_dev * avg_pvop / rc->alt_curve_low_diff;                                  rc->num_keyframes++;
936                            case 'p':
937                            case 'P':
938                            case 'b':
939                            case 'B':
940                            case 's':
941                            case 'S':
942                                    rc->num_frames++;
943                                  break;                                  break;
944                          case XVID_CURVE_COSINE: // Cosine Curve (low aggressiveness)                          default:
945                                  rc->alt_curve_qual_dev *= 2.0 / (1.0 + (1.0 - cos(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff))));                                  DPRINTF(XVID_DEBUG_RC,
946                                  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)));                                                  "[xvid rc] -- WARNING: L%d unknown frame type used (%c).\n",
947                                                    lines, type);
948                          }                          }
949                    } else {
950                                    DPRINTF(XVID_DEBUG_RC,
951                                                    "[xvid rc] -- WARNING: L%d misses some stat fields (%d).\n",
952                                                    lines, 7-fields);
953                  }                  }
954    
955                    /* Free the line buffer */
956                    free(line);
957      }      }
     /* --- */  
958    
959            /* We are done with the file */
960            fclose(f);
961    
962      total1=total2=0;          if (!rc->num_keyframes) return (-1); /* No keyframes? Then something is wrong */
963      for (i=j=0; i<rc->num_frames; i++) {          else return(0);
964          stat_t * s = &rc->stats[i];  }
965    
966          if (s->type != XVID_TYPE_IVOP) {  /* open stats file(s) and read into rc->stats array */
967              double dbytes,dbytes2;  static int
968    statsfile_load(rc_2pass2_t *rc, char * filename)
969    {
970            FILE * f;
971            int processed_entries;
972    
973              dbytes = s->scaled_length / rc->movie_curve;          /* Opens the file */
974              dbytes2 = 0; /* XXX: warning */          if ((f = fopen(filename, "rb"))==NULL)
975              total1 += dbytes;                  return(-1);
976              if (s->type == XVID_TYPE_BVOP)  
977                  dbytes *= rc->avg_length[XVID_TYPE_PVOP-1] / rc->avg_length[XVID_TYPE_BVOP-1];          processed_entries = 0;
978            while(processed_entries < rc->num_frames) {
979              if (rc->param.use_alt_curve) {                  char type;
980                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                  int fields;
981                    twopass_stat_t * s = &rc->stats[processed_entries];
982                      if (dbytes >= rc->alt_curve_high) {                  char *line, *ptr;
983                                                  dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev);  
984                      }else{                  /* Read the line from the file */
985                                                  switch(rc->param.alt_curve_type) {                  if((line = readline(f)) == NULL)
                         case XVID_CURVE_SINE :  
                                                     dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * sin(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_high_diff)));  
                                                         break;  
                         case XVID_CURVE_LINEAR :  
                                                     dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) / rc->alt_curve_high_diff);  
986                                                          break;                                                          break;
987                                                  case XVID_CURVE_COSINE :  
988                                                      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))));                  /* We skip spaces */
989                                                  }                  ptr = skipspaces(line);
990    
991                    /* Skip comment lines or empty lines */
992                    if(iscomment(ptr) || *ptr == '\0') {
993                            free(line);
994                            continue;
995                                          }                                          }
996                  }else{  
997                      if (dbytes <= rc->alt_curve_low) {                  /* Reset this field that is optional */
998                                                  dbytes2 = dbytes;                  s->scaled_length = 0;
999                      }else{  
1000                                                  switch(rc->param.alt_curve_type) {                  /* Convert the fields */
1001                                                  case XVID_CURVE_SINE :                  fields = sscanf(ptr,
1002                                                      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)));                                                  "%c %d %d %d %d %d %d %d\n",
1003                                                    &type,
1004                                                    &s->quant,
1005                                                    &s->blks[0], &s->blks[1], &s->blks[2],
1006                                                    &s->length, &s->invariant /* not really yet */,
1007                                                    &s->scaled_length);
1008    
1009                    /* Free line buffer, we don't need it anymore */
1010                    free(line);
1011    
1012                    /* Fail silently, this has probably been warned in
1013                     * statsfile_count_frames */
1014                    if(fields != 7 && fields != 8)
1015                            continue;
1016    
1017                    /* Convert frame type and compute the invariant length part */
1018                    switch(type) {
1019                    case 'i':
1020                    case 'I':
1021                            s->type = XVID_TYPE_IVOP;
1022                            s->invariant /= INVARIANT_HEADER_PART_IVOP;
1023                                                          break;                                                          break;
1024                                                  case XVID_CURVE_LINEAR :                  case 'p':
1025                                                      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);                  case 'P':
1026                    case 's':
1027                    case 'S':
1028                            s->type = XVID_TYPE_PVOP;
1029                            s->invariant /= INVARIANT_HEADER_PART_PVOP;
1030                                                          break;                                                          break;
1031                                                  case XVID_CURVE_COSINE :                  case 'b':
1032                                                      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))));                  case 'B':
1033                            s->type = XVID_TYPE_BVOP;
1034                            s->invariant /= INVARIANT_HEADER_PART_BVOP;
1035                            break;
1036                    default:
1037                            /* Same as before, fail silently */
1038                            continue;
1039                                                  }                                                  }
1040    
1041                    /* Ok it seems it's been processed correctly */
1042                    processed_entries++;
1043                                          }                                          }
1044    
1045            /* Close the file */
1046            fclose(f);
1047    
1048            return(0);
1049                  }                  }
1050    
1051    /* pre-process the statistics data
1052     * - for each type, count, tot_length, min_length, max_length
1053     * - set keyframes_locations, tot_prescaled */
1054    static void
1055    first_pass_stats_prepare_data(rc_2pass2_t * rc)
1056    {
1057            int i,j;
1058    
1059              }else{          /* *rc fields initialization
1060                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {           * NB: INT_MAX and INT_MIN are used in order to be immediately replaced
1061                      dbytes2=((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_high / 100.0);           *     with real values of the 1pass */
1062                  }else{          for (i=0; i<3; i++) {
1063                                  dbytes2 = ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_low / 100.0);                  rc->count[i]=0;
1064                    rc->tot_length[i] = 0;
1065                    rc->tot_invariant[i] = 0;
1066                    rc->min_length[i] = INT_MAX;
1067                  }                  }
1068    
1069            rc->max_length = INT_MIN;
1070            rc->tot_weighted = 0;
1071    
1072            /* Loop through all frames and find/compute all the stuff this function
1073             * is supposed to do */
1074            for (i=j=0; i<rc->num_frames; i++) {
1075                    twopass_stat_t * s = &rc->stats[i];
1076    
1077                    rc->count[s->type-1]++;
1078                    rc->tot_length[s->type-1] += s->length;
1079                    rc->tot_invariant[s->type-1] += s->invariant;
1080                    if (s->zone_mode != XVID_ZONE_QUANT)
1081                            rc->tot_weighted += (int)(s->weight*(s->length - s->invariant));
1082    
1083                    if (s->length < rc->min_length[s->type-1]) {
1084                            rc->min_length[s->type-1] = s->length;
1085              }              }
1086    
1087              if (s->type == XVID_TYPE_BVOP) {                  if (s->length > rc->max_length) {
1088                              dbytes2 *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];                          rc->max_length = s->length;
                             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];  
1089              }              }
1090              total2 += dbytes2;  
1091                    if (s->type == XVID_TYPE_IVOP) {
1092                            rc->keyframe_locations[j] = i;
1093                            j++;
1094          }          }
1095      }      }
1096    
1097      rc->curve_comp_scale = total1 / total2;          /* NB:
1098             * The "per sequence" overflow system considers a natural sequence to be
1099             * formed by all frames between two iframes, so if we want to make sure
1100             * the system does not go nuts during last sequence, we force the last
1101             * frame to appear in the keyframe locations array. */
1102            rc->keyframe_locations[j] = i;
1103    
1104      if (!rc->param.use_alt_curve) {          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Min 1st pass IFrame length: %d\n", rc->min_length[0]);
1105          printf("middle frame size for asymmetric curve compression: %i\n",          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Min 1st pass PFrame length: %d\n", rc->min_length[1]);
1106              (int)(rc->avg_length[XVID_TYPE_PVOP-1] * rc->curve_comp_scale));          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Min 1st pass BFrame length: %d\n", rc->min_length[2]);
1107      }      }
1108    
1109      if (rc->param.use_alt_curve) {  /* calculate zone weight "center" */
1110          int bonus_bias = rc->param.alt_curve_bonus_bias;  static void
1111          int oldquant = 1;  zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)
1112    {
1113            int i,j;
1114            int n = 0;
1115    
1116              if (rc->param.alt_curve_use_auto_bonus_bias)          rc->tot_quant = 0;
1117                      bonus_bias = rc->param.alt_curve_min_rel_qual;          rc->tot_quant_invariant = 0;
1118    
1119              rc->alt_curve_curve_bias_bonus = (total1 - total2) * (double)bonus_bias / 100.0 / (double)(rc->num_frames /* - credits_frames */ - rc->num_keyframes);          if (create->num_zones == 0) {
1120              rc->curve_comp_scale = ((total1 - total2) * (1.0 - (double)bonus_bias / 100.0) + total2) / total2;                  for (j = 0; j < rc->num_frames; j++) {
1121                            rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1122                            rc->stats[j].weight = 1.0;
1123                    }
1124                    n += rc->num_frames;
1125            }
1126    
1127    
1128          /* special info for alt curve:  bias bonus and quantizer thresholds */          for(i=0; i < create->num_zones; i++) {
1129    
1130                  printf("avg scaled framesize:%i", (int)rc->avg_length[XVID_TYPE_PVOP-1]);                  int next = (i+1<create->num_zones) ? create->zones[i+1].frame : rc->num_frames;
                 printf("bias bonus:%i bytes", (int)rc->alt_curve_curve_bias_bonus);  
1131    
1132                  for (i=1; i <= (int)(rc->alt_curve_high*2)+1; i++) {                  /* Zero weight make no sense */
1133              double curve_temp, dbytes;                  if (create->zones[i].increment == 0) create->zones[i].increment = 1;
1134              int newquant;                  /* And obviously an undetermined infinite makes even less sense */
1135                    if (create->zones[i].base == 0) create->zones[i].base = 1;
1136    
1137              dbytes = i;                  if (i==0 && create->zones[i].frame > 0) {
1138                          if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                          for (j = 0; j < create->zones[i].frame && j < rc->num_frames; j++) {
1139                  if (dbytes >= rc->alt_curve_high) {                                  rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1140                                          curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev);                                  rc->stats[j].weight = 1.0;
                 }else{  
                                         switch(rc->param.alt_curve_type)  
                                         {  
                                         case XVID_CURVE_SINE :  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * sin(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_high_diff)));  
                                                 break;  
                                         case XVID_CURVE_LINEAR :  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) / rc->alt_curve_high_diff);  
                                                 break;  
                                         case XVID_CURVE_COSINE :  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_high_diff))));  
                                         }  
                                 }  
                         }else{  
                 if (dbytes <= rc->alt_curve_low) {  
                                         curve_temp = dbytes;  
                 }else{  
                                         switch(rc->param.alt_curve_type)  
                                         {  
                                         case XVID_CURVE_SINE :  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * sin(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_low_diff)));  
                                                 break;  
                                         case XVID_CURVE_LINEAR :  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) / rc->alt_curve_low_diff);  
                                                 break;  
                                         case XVID_CURVE_COSINE :  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual + rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_low_diff))));  
1141                                          }                                          }
1142                            n += create->zones[i].frame;
1143                                  }                                  }
                         }  
   
                         if (rc->movie_curve > 1.0)  
                                 dbytes *= rc->movie_curve;  
1144    
1145                          newquant = (int)(dbytes * 2.0 / (curve_temp * rc->curve_comp_scale + rc->alt_curve_curve_bias_bonus));                  if (create->zones[i].mode == XVID_ZONE_WEIGHT) {
1146                          if (newquant > 1) {                          for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {
1147                                  if (newquant != oldquant) {                                  rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1148                      int percent = (int)((i - rc->avg_length[XVID_TYPE_PVOP-1]) * 100.0 / rc->avg_length[XVID_TYPE_PVOP-1]);                                  rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;
                                         oldquant = newquant;  
                                         printf("quant:%i threshold at %i : %i percent", newquant, i, percent);  
1149                                  }                                  }
1150                            next -= create->zones[i].frame;
1151                            n += next;
1152                    } else{  /* XVID_ZONE_QUANT */
1153                            for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {
1154                                    rc->stats[j].zone_mode = XVID_ZONE_QUANT;
1155                                    rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;
1156                                    rc->tot_quant += rc->stats[j].length;
1157                                    rc->tot_quant_invariant += rc->stats[j].invariant;
1158                          }                          }
1159                  }                  }
   
1160      }      }
   
     rc->overflow = 0;  
     rc->KFoverflow = 0;  
     rc->KFoverflow_partial = 0;  
     rc->KF_idx = 1;  
1161  }  }
1162    
1163    
1164    /* scale the curve */
1165    static void
1166  static int rc_2pass2_create(xvid_plg_create_t * create, rc_2pass2_t ** handle)  first_pass_scale_curve_internal(rc_2pass2_t *rc)
1167  {  {
1168      xvid_plugin_2pass2_t * param = (xvid_plugin_2pass2_t *)create->param;          int64_t target;
1169      rc_2pass2_t * rc;          int64_t total_invariant;
1170            double scaler;
1171      rc = malloc(sizeof(rc_2pass2_t));          int i, num_MBs;
1172      if (rc == NULL)  
1173          return XVID_ERR_MEMORY;          /* We only scale texture data ! */
1174            total_invariant  = rc->tot_invariant[XVID_TYPE_IVOP-1];
1175            total_invariant += rc->tot_invariant[XVID_TYPE_PVOP-1];
1176            total_invariant += rc->tot_invariant[XVID_TYPE_BVOP-1];
1177            /* don't forget to substract header bytes used in quant zones, otherwise we
1178             * counting them twice */
1179            total_invariant -= rc->tot_quant_invariant;
1180    
1181            /* We remove the bytes used by the fixed quantizer zones during first pass
1182             * with the same quants, so we know very precisely how much that
1183             * represents */
1184            target  = rc->target;
1185            target -= rc->tot_quant;
1186    
1187            /* Let's compute a linear scaler in order to perform curve scaling */
1188            scaler = (double)(target - total_invariant) / (double)(rc->tot_weighted);
1189    
1190    #ifdef SMART_OVERFLOW_SETTING
1191            if (scaler > 0.9) {
1192                    rc->param.max_overflow_degradation *= 5;
1193                    rc->param.max_overflow_improvement *= 5;
1194                    rc->param.overflow_control_strength *= 3;
1195            } else if (scaler > 0.6) {
1196                    rc->param.max_overflow_degradation *= 2;
1197                    rc->param.max_overflow_improvement *= 2;
1198                    rc->param.overflow_control_strength *= 2;
1199            } else {
1200                    rc->min_quant = 2;
1201            }
1202    #endif
1203    
1204            /* Compute min frame lengths (for each frame type) according to the number
1205             * of MBs. We sum all block type counters of frame 0, this gives us the
1206             * number of MBs.
1207             *
1208             * We compare these hardcoded values with observed values in first pass
1209             * (determined in pre_process0).Then we keep the real minimum. */
1210    
1211      rc->param = *param;          /* Number of MBs */
1212            num_MBs  = rc->stats[0].blks[0];
1213            num_MBs += rc->stats[0].blks[1];
1214            num_MBs += rc->stats[0].blks[2];
1215    
1216            /* Minimum for I frames */
1217            if(rc->min_length[XVID_TYPE_IVOP-1] > ((num_MBs*22) + 240) / 8)
1218                    rc->min_length[XVID_TYPE_IVOP-1] = ((num_MBs*22) + 240) / 8;
1219    
1220            /* Minimum for P/S frames */
1221            if(rc->min_length[XVID_TYPE_PVOP-1] > ((num_MBs) + 88)  / 8)
1222                    rc->min_length[XVID_TYPE_PVOP-1] = ((num_MBs) + 88)  / 8;
1223    
1224            /* Minimum for B frames */
1225            if(rc->min_length[XVID_TYPE_BVOP-1] > 8)
1226                    rc->min_length[XVID_TYPE_BVOP-1] = 8;
1227    
1228      if (rc->param.keyframe_boost <= 0) rc->param.keyframe_boost = 0;          /* Perform an initial scale pass.
1229      if (rc->param.payback_method <= 0) rc->param.payback_method = XVID_PAYBACK_PROP;           *
1230      if (rc->param.bitrate_payback_delay <= 0) rc->param.bitrate_payback_delay = 250;           * If a frame size is scaled underneath our hardcoded minimums, then we
1231      if (rc->param.curve_compression_high <= 0) rc->param.curve_compression_high = 0;           * force the frame size to the minimum, and deduct the original & scaled
1232      if (rc->param.curve_compression_low <= 0) rc->param.curve_compression_low = 0;           * frame length from the original and target total lengths */
1233      if (rc->param.max_overflow_improvement <= 0) rc->param.max_overflow_improvement = 60;          for (i=0; i<rc->num_frames; i++) {
1234      if (rc->param.max_overflow_degradation <= 0) rc->param.max_overflow_degradation = 60;                  twopass_stat_t * s = &rc->stats[i];
1235      if (rc->param.min_quant[0] <= 0) rc->param.min_quant[0] = 2;                  int len;
     if (rc->param.max_quant[0] <= 0) rc->param.max_quant[0] = 31;  
     if (rc->param.min_quant[1] <= 0) rc->param.min_quant[1] = 2;  
     if (rc->param.max_quant[1] <= 0) rc->param.max_quant[1] = 31;  
     if (rc->param.min_quant[2] <= 0) rc->param.min_quant[2] = 2;  
     if (rc->param.max_quant[2] <= 0) rc->param.max_quant[2] = 31;  
   
     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;  
1236    
1237      if (!det_stats_length(rc, param->filename1)){                  /* No need to scale frame length for which a specific quantizer is
1238          DPRINTF(DPRINTF_RC,"fopen %s failed\n", param->filename1);                   * specified thanks to zones */
1239          free(rc);                  if (s->zone_mode == XVID_ZONE_QUANT) {
1240          return XVID_ERR_FAIL;                          s->scaled_length = s->length;
1241                            continue;
1242      }      }
1243    
1244      if ((rc->stats = malloc(rc->num_frames * sizeof(stat_t))) == NULL) {                  /* Compute the scaled length -- only non invariant data length is scaled */
1245          free(rc);                  len = s->invariant + (int)((double)(s->length-s->invariant) * scaler * s->weight);
         return XVID_ERR_MEMORY;  
     }  
1246    
1247      /* XXX: do we need an addition location */                  /* Compare with the computed minimum */
1248      if ((rc->keyframe_locations = malloc((rc->num_keyframes + 1) * sizeof(int))) == NULL) {                  if (len < rc->min_length[s->type-1]) {
1249          free(rc->stats);                          /* This is a 'forced size' frame, set its frame size to the
1250          free(rc);                           * computed minimum */
1251          return XVID_ERR_MEMORY;                          s->scaled_length = rc->min_length[s->type-1];
     }  
1252    
1253      if (!load_stats(rc, param->filename1, param->filename2)) {                          /* Remove both scaled and original size from their respective
1254          DPRINTF(DPRINTF_RC,"fopen %s,%s failed\n", param->filename1, param->filename2);                           * total counters, as we prepare a second pass for 'regular'
1255          free(rc->keyframe_locations);                           * frames */
1256          free(rc->stats);                          target -= s->scaled_length;
1257          free(rc);                  } else {
1258          return XVID_ERR_FAIL;                          /* Do nothing for now, we'll scale this later */
1259                            s->scaled_length = 0;
1260                    }
1261      }      }
1262    
1263      /* pre-process our stats */          /* The first pass on data substracted all 'forced size' frames from the
1264      pre_process(rc);           * total counters. Now, it's possible to scale the 'regular' frames. */
1265    
1266      *handle = rc;          /* Scaling factor for 'regular' frames */
1267          return(0);          scaler = (double)(target - total_invariant) / (double)(rc->tot_weighted);
 }  
1268    
1269            /* Do another pass with the new scaler */
1270            for (i=0; i<rc->num_frames; i++) {
1271                    twopass_stat_t * s = &rc->stats[i];
1272    
1273  static int rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy)                  /* Ignore frame with forced frame sizes */
1274  {                  if (s->scaled_length == 0)
1275      free(rc->keyframe_locations);                          s->scaled_length = s->invariant + (int)((double)(s->length-s->invariant) * scaler * s->weight);
     free(rc->stats);  
         free(rc);  
         return(0);  
1276  }  }
1277    
1278            /* Job done */
1279            return;
1280    }
1281    
1282    /* Apply all user settings to the scaled curve
1283  static int rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)   * This implies:
1284     *   keyframe boosting
1285     *   high/low compression */
1286    static void
1287    scaled_curve_apply_advanced_parameters(rc_2pass2_t * rc)
1288  {  {
1289      stat_t * s = &rc->stats[data->frame_num];          int i;
1290      int overflow;          int64_t ivop_boost_total;
     int desired;  
     double dbytes;  
     double curve_temp;  
     int capped_to_max_framesize = 0;  
   
     if (data->frame_num >= rc->num_frames) {  
         /* insufficent stats data */  
         return 0;  
     }  
1291    
1292      overflow = rc->overflow / 8;        /* XXX: why by 8 */          /* Reset the rate controller (per frame type) total byte counters */
1293            for (i=0; i<3; i++) rc->tot_scaled_length[i] = 0;
1294    
1295      if (s->type == XVID_TYPE_IVOP) {        /* XXX: why */          /* Compute total bytes for each frame type */
1296          overflow = 0;          for (i=0; i<rc->num_frames;i++) {
1297                    twopass_stat_t *s = &rc->stats[i];
1298                    rc->tot_scaled_length[s->type-1] += s->scaled_length;
1299      }      }
1300    
1301      desired = s->scaled_length;          /* First we compute the total amount of bits needed, as being described by
1302             * the scaled distribution. During this pass over the complete stats data,
1303             * we see how much bits two user settings will get/give from/to p&b frames:
1304             *  - keyframe boosting
1305             *  - keyframe distance penalty */
1306            rc->KF_idx = 0;
1307            ivop_boost_total = 0;
1308            for (i=0; i<rc->num_frames; i++) {
1309                    twopass_stat_t * s = &rc->stats[i];
1310    
1311      dbytes = desired;                  /* Some more work is needed for I frames */
1312      if (s->type == XVID_TYPE_IVOP) {      if (s->type == XVID_TYPE_IVOP) {
1313          dbytes += desired * rc->param.keyframe_boost / 100;                          int ivop_boost;
     }  
     dbytes /= rc->movie_curve;  
1314    
1315      if (s->type == XVID_TYPE_BVOP) {                          /* Accumulate bytes needed for keyframe boosting */
1316          dbytes *= rc->avg_length[XVID_TYPE_PVOP-1] / rc->avg_length[XVID_TYPE_BVOP-1];                          ivop_boost = s->scaled_length*rc->param.keyframe_boost/100;
     }  
1317    
1318      if (rc->param.payback_method == XVID_PAYBACK_BIAS) {  #if 0 /* ToDo: decide how to apply kfthresholding */
1319          desired =(int)(rc->curve_comp_error / rc->param.bitrate_payback_delay);  #endif
1320      }else{                          /* If the frame size drops under the minimum length, then cap ivop_boost */
1321                  desired = (int)(rc->curve_comp_error * dbytes /                          if (ivop_boost + s->scaled_length < rc->min_length[XVID_TYPE_IVOP-1])
1322                          rc->avg_length[XVID_TYPE_PVOP-1] / rc->param.bitrate_payback_delay);                                  ivop_boost = rc->min_length[XVID_TYPE_IVOP-1] - s->scaled_length;
1323    
1324                            /* Accumulate the ivop boost */
1325                            ivop_boost_total += ivop_boost;
1326    
1327                  if (labs(desired) > fabs(rc->curve_comp_error)) {                          /* Don't forget to update the keyframe index */
1328                          desired = (int)rc->curve_comp_error;                          rc->KF_idx++;
1329                  }                  }
1330      }      }
1331    
1332      rc->curve_comp_error -= desired;          /* Initialize the IBoost tax ratio for P/S/B frames
1333             *
1334             * This ratio has to be applied to p/b/s frames in order to reserve
1335             * additional bits for keyframes (keyframe boosting) or if too much
1336             * keyframe distance is applied, bits retrieved from the keyframes.
1337             *
1338             * ie pb_length *= rc->pb_iboost_tax_ratio;
1339             *
1340             *    gives the ideal length of a p/b frame */
1341    
1342      /* alt curve */          /* Compute the total length of p/b/s frames (temporary storage into
1343             * movie_curve) */
1344            rc->pb_iboost_tax_ratio  = (double)rc->tot_scaled_length[XVID_TYPE_PVOP-1];
1345            rc->pb_iboost_tax_ratio += (double)rc->tot_scaled_length[XVID_TYPE_BVOP-1];
1346    
1347            /* Compute the ratio described above
1348             *     taxed_total = sum(0, n, tax*scaled_length)
1349             * <=> taxed_total = tax.sum(0, n, scaled_length)
1350             * <=> tax = taxed_total / original_total */
1351            rc->pb_iboost_tax_ratio =
1352                    (rc->pb_iboost_tax_ratio - ivop_boost_total) /
1353                    rc->pb_iboost_tax_ratio;
1354    
1355      curve_temp = 0; /* XXX: warning */          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- IFrame boost tax ratio:%.2f\n",
1356                            rc->pb_iboost_tax_ratio);
1357    
1358      if (rc->param.use_alt_curve) {          /* Compute the average size of frames per frame type */
1359          if (s->type != XVID_TYPE_IVOP)  {          for(i=0; i<3; i++) {
1360              if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                  /* Special case for missing type or weird case */
1361                  if (dbytes >= rc->alt_curve_high) {                  if (rc->count[i] == 0 || rc->pb_iboost_tax_ratio == 0) {
1362                                          curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev);                          rc->avg_length[i] = 1;
                 }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))));  
                                         }  
                                 }  
1363                          }else{                          }else{
1364                  if (dbytes <= rc->alt_curve_low){                          rc->avg_length[i] = rc->tot_scaled_length[i];
1365                                          curve_temp = dbytes;  
1366                            if (i == (XVID_TYPE_IVOP-1)) {
1367                                    /* I Frames total has to be added the boost total */
1368                                    rc->avg_length[i] += ivop_boost_total;
1369                  }else{                  }else{
1370                                          switch(rc->param.alt_curve_type) {                                  /* P/B frames has to taxed */
1371                                          case XVID_CURVE_SINE :                                  rc->avg_length[i] *= rc->pb_iboost_tax_ratio;
                                             curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * sin(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_low_diff)));  
                                                 break;  
                                         case XVID_CURVE_LINEAR :  
                                             curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) / rc->alt_curve_low_diff);  
                                                 break;  
                                         case XVID_CURVE_COSINE :  
                                             curve_temp = dbytes * (rc->alt_curve_mid_qual + rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_low_diff))));  
1372                      }                      }
1373    
1374                            /* Finally compute the average frame size */
1375                            rc->avg_length[i] /= (double)rc->count[i];
1376                                  }                                  }
1377                          }                          }
                         if (s->type == XVID_TYPE_BVOP)  
                                 curve_temp *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
1378    
1379                          curve_temp = curve_temp * rc->curve_comp_scale + rc->alt_curve_curve_bias_bonus;          /* Assymetric curve compression */
1380            if (rc->param.curve_compression_high || rc->param.curve_compression_low) {
1381                    double symetric_total;
1382                    double assymetric_delta_total;
1383    
1384                          desired += ((int)curve_temp);                  /* Like I frame boosting, assymetric curve compression modifies the total
1385                          rc->curve_comp_error += curve_temp - (int)curve_temp;                   * amount of needed bits, we must compute the ratio so we can prescale
1386                  }else{                   lengths */
1387                          if (s->type == XVID_TYPE_BVOP)                  symetric_total = 0;
1388                                  dbytes *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];                  assymetric_delta_total = 0;
1389                    for (i=0; i<rc->num_frames; i++) {
1390                            double assymetric_delta;
1391                            double dbytes;
1392                            twopass_stat_t * s = &rc->stats[i];
1393    
1394                          desired += ((int)dbytes);                          /* I Frames are not concerned by assymetric scaling */
1395                          rc->curve_comp_error += dbytes - (int)dbytes;                          if (s->type == XVID_TYPE_IVOP)
1396                  }                                  continue;
1397    
1398      }else if ((rc->param.curve_compression_high + rc->param.curve_compression_low) &&   s->type != XVID_TYPE_IVOP) {                          /* During the real run, we would have to apply the iboost tax */
1399                            dbytes = s->scaled_length * rc->pb_iboost_tax_ratio;
1400    
1401          curve_temp = rc->curve_comp_scale;                          /* Update the symmetric curve compression total */
1402          if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                          symetric_total += dbytes;
             curve_temp *= ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_high / 100.0);  
         } else {  
             curve_temp *= ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_low / 100.0);  
         }  
1403    
1404          if (s->type == XVID_TYPE_BVOP){                          /* Apply assymetric curve compression */
1405              curve_temp *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];                          if (dbytes > rc->avg_length[s->type-1])
1406          }                                  assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * (double)rc->param.curve_compression_high / 100.0f;
1407                            else
1408                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * (double)rc->param.curve_compression_low  / 100.0f;
1409    
1410          desired += (int)curve_temp;                          /* Cap to the minimum frame size if needed */
1411          rc->curve_comp_error += curve_temp - (int)curve_temp;                          if (dbytes + assymetric_delta < rc->min_length[s->type-1])
1412      }else{                                  assymetric_delta = rc->min_length[s->type-1] - dbytes;
         if (s->type == XVID_TYPE_BVOP){  
                         dbytes *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
         }  
1413    
1414                  desired += (int)dbytes;                          /* Accumulate after assymetric curve compression */
1415                  rc->curve_comp_error += dbytes - (int)dbytes;                          assymetric_delta_total += assymetric_delta;
1416      }      }
1417    
1418          if (desired > s->length){                  /* Compute the tax that all p/b frames have to pay in order to respect the
1419                  rc->curve_comp_error += desired - s->length;                   * bit distribution changes that the assymetric compression curve imposes
1420                  desired = s->length;                   * We want assymetric_total = sum(0, n-1, tax.scaled_length)
1421                     *      ie assymetric_total = ratio.sum(0, n-1, scaled_length)
1422                     *         ratio = assymetric_total / symmetric_total */
1423                    rc->assymetric_tax_ratio = ((double)symetric_total - (double)assymetric_delta_total) / (double)symetric_total;
1424          }else{          }else{
1425          if (desired < rc->min_length[s->type-1]) {                  rc->assymetric_tax_ratio = 1.0f;
             if (s->type == XVID_TYPE_IVOP){  
                 rc->curve_comp_error -= rc->min_length[XVID_TYPE_IVOP-1] - desired;  
             }  
             desired = rc->min_length[s->type-1];  
1426          }          }
1427    
1428            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Assymetric tax ratio:%.2f\n", rc->assymetric_tax_ratio);
1429    
1430            /* Last bits that need to be reset */
1431            rc->overflow = 0;
1432            rc->KFoverflow = 0;
1433            rc->KFoverflow_partial = 0;
1434            rc->KF_idx = 0;
1435            rc->desired_total = 0;
1436            rc->real_total = 0;
1437    
1438            /* Job done */
1439            return;
1440          }          }
1441    
1442      s->desired_length = desired;  /*****************************************************************************
1443     * VBV compliancy check and scale
1444     * MPEG-4 standard specifies certain restrictions for bitrate/framesize in VBR
1445     * to enable playback on devices with limited readspeed and memory (and which
1446     * aren't...)
1447     *
1448     * DivX profiles have 2 criteria: VBV as in MPEG standard
1449     *                                a limit on peak bitrate for any 1 second
1450     *
1451     * But if VBV is fulfilled, peakrate is automatically fulfilled in any profile
1452     * defined so far, so we check for it (for completeness) but correct only VBV
1453     *
1454     *****************************************************************************/
1455    
1456    #define VBV_COMPLIANT 0
1457    #define VBV_UNDERFLOW 1  /* video buffer runs empty */
1458    #define VBV_OVERFLOW  2  /* doesn't exist for VBR encoding */
1459    #define VBV_PEAKRATE  4  /* peak bitrate (within 1s) violated */
1460    
1461      /* if this keyframe is too close to the next, reduce it's byte allotment  static int
1462      XXX: why do we do this after setting the desired length  */  check_curve_for_vbv_compliancy(rc_2pass2_t * rc, const float fps)
1463    {
1464            /* We do all calculations in float, for higher accuracy,
1465             * and in bytes for convenience.
1466             *
1467             * typical values from e.g. Home profile:
1468             *  vbv_size= 384*1024 (384kB)
1469             *  vbv_initial= 288*1024 (75% fill)
1470             *  maxrate= 4854000 (4.854MBps)
1471             *  peakrate= 8000000 (8MBps)
1472             *
1473             *  PAL: offset1s = 25 (1 second of 25fps)
1474             *  NTSC: offset1s = 30 (1 second of 29.97fps) or 24 (1 second of 23.976fps)
1475             */
1476    
1477          if (s->type == XVID_TYPE_IVOP) {          const float vbv_size = (float)rc->param.vbv_size/8.f;
1478                  int KFdistance = rc->keyframe_locations[rc->KF_idx] - rc->keyframe_locations[rc->KF_idx - 1];          float vbvfill = (float)rc->param.vbv_initial/8.f;
1479            float vbvmin;
1480    
1481            const float maxrate = (float)rc->param.vbv_maxrate;
1482            const float peakrate = (float)rc->param.vbv_peakrate;
1483            const float r0 = (int)(maxrate/fps+0.5)/8.f;
1484    
1485          if (KFdistance < rc->param.kftreshold) {          int bytes1s = 0;
1486            int offset1s = (int)(1.f*fps+0.5);
1487            int i;
1488    
1489              KFdistance = KFdistance - rc->param.min_key_interval;          /* 1Gbit should be enough to inuitialize the vbvmin
1490             *      an arbitrary high value */
1491            vbvmin = 1000*1000*1000;
1492    
1493                          if (KFdistance >= 0) {          for (i=0; i<rc->num_frames; i++) {
1494                  int KF_min_size;                  /* DivX 1s peak bitrate check  */
1495                    bytes1s += rc->stats[i].scaled_length;
1496                    if (i>=offset1s)
1497                            bytes1s -= rc->stats[i-offset1s].scaled_length;
1498    
1499                                  KF_min_size = desired * (100 - rc->param.kfreduction) / 100;      /* ignore peakrate constraint if peakrate is <= 0.f */
1500                                  if (KF_min_size < 1)                  if (peakrate>0.f && 8.f*bytes1s > peakrate)
1501                                          KF_min_size = 1;                          return(VBV_PEAKRATE);
1502    
1503                                  desired = KF_min_size + (desired - KF_min_size) * KFdistance /                  /* update vbv fill level */
1504                                          (rc->param.kftreshold - rc->param.min_key_interval);                  vbvfill += r0 - rc->stats[i].scaled_length;
1505    
1506                                  if (desired < 1)                  /* this check is _NOT_ an "overflow"! only reading from disk stops then */
1507                                          desired = 1;                  if (vbvfill > vbv_size)
1508                          }                          vbvfill = vbv_size;
                 }  
         }  
1509    
1510      overflow = (int)((double)overflow * desired / rc->avg_length[XVID_TYPE_PVOP-1]);                  /* but THIS would be an underflow. report it! */
1511                    if (vbvfill < 0)
1512                            return(VBV_UNDERFLOW);
1513    
1514          // Foxer: reign in overflow with huge frames                  /* Store the minimum buffer filling */
1515          if (labs(overflow) > labs(rc->overflow)) {                  if (vbvfill < vbvmin)
1516                  overflow = rc->overflow;                          vbvmin = vbvfill;
1517          }          }
1518    
1519      // Foxer: make sure overflow doesn't run away          DPRINTF(XVID_DEBUG_RC, "[xvid rc] Minimum buffer fill: %f bytes\n", vbvmin);
1520    
1521          if (overflow > desired * rc->param.max_overflow_improvement / 100) {          return(VBV_COMPLIANT);
                 desired += (overflow <= desired) ? desired * rc->param.max_overflow_improvement / 100 :  
                         overflow * rc->param.max_overflow_improvement / 100;  
         }else if (overflow < desired * rc->param.max_overflow_degradation / -100){  
                 desired += desired * rc->param.max_overflow_degradation / -100;  
         }else{  
                 desired += overflow;  
1522          }          }
1523    
     if (desired > rc->max_length) {  
                 capped_to_max_framesize = 1;  
                 desired = rc->max_length;  
         }  
1524    
1525      // make sure to not scale below the minimum framesize  static int
1526      if (desired < rc->min_length[s->type-1]) {  scale_curve_for_vbv_compliancy(rc_2pass2_t * rc, const float fps)
1527          desired = rc->min_length[s->type-1];  {
1528      }          /* correct any VBV violations. Peak bitrate violations disappears
1529             * by this automatically
1530             *
1531             * This implementation follows
1532             *
1533             * Westerink, Rajagopalan, Gonzales "Two-pass MPEG-2 variable-bitrate encoding"
1534             * IBM J. RES. DEVELOP. VOL 43, No. 4, July 1999, p.471--488
1535             *
1536             * Thanks, guys! This paper rocks!!! */
1537    
1538            /* For each scene of len N, we have to check up to N^2 possible buffer fills.
1539             * This works well with MPEG-2 where N==12 or so, but for MPEG-4 it's a
1540             * little slow...
1541             *
1542             * TODO: Better control on VBVfill between scenes */
1543    
1544      // very 'simple' quant<->filesize relationship          const float vbv_size = (float)rc->param.vbv_size/8.f;
1545      data->quant= (s->quant * s->length) / desired;          const float vbv_initial = (float)rc->param.vbv_initial/8.f;
1546    
1547          if (data->quant < 1) {          const float maxrate = 0.9*rc->param.vbv_maxrate;
1548                  data->quant = 1;          const float vbv_low = 0.10f*vbv_size;
1549      } else if (data->quant > 31) {          const float r0 = (int)(maxrate/fps+0.5)/8.f;
1550                  data->quant = 31;  
1551            int i,k,l,n,violation = 0;
1552            float *scenefactor;
1553            int *scenestart;
1554            int *scenelength;
1555    
1556            /* first step: determine how many "scenes" there are and store their
1557             * boundaries we could get all this from existing keyframe_positions,
1558             * somehow, but there we don't have a min_scenelength, and it's no big
1559             * deal to get it again. */
1560    
1561            const int min_scenelength = (int)(fps+0.5);
1562            int num_scenes = 0;
1563            int last_scene = -999;
1564            for (i=0; i<rc->num_frames; i++) {
1565                    if ((rc->stats[i].type == XVID_TYPE_IVOP) && (i-last_scene>min_scenelength)) {
1566                            last_scene = i;
1567                            num_scenes++;
1568                    }
1569          }          }
         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;  
1570    
1571                          if (rc->bquant_error[data->quant] >= 1.0) {          scenefactor = (float*)malloc(num_scenes*sizeof(float));
1572                                  rc->bquant_error[data->quant] -= 1.0;          scenestart = (int*)malloc(num_scenes*sizeof(int));
1573                                  data->quant++;          scenelength = (int*)malloc(num_scenes*sizeof(int));
1574    
1575            if ((!scenefactor) || (!scenestart) || (!scenelength) ) {
1576                    free(scenefactor);
1577                    free(scenestart);
1578                    free(scenelength);
1579                    /* remember: free(0) is valid and does exactly nothing. */
1580                    return(-1);
1581                          }                          }
                 }else{  
                         rc->pquant_error[data->quant] += ((double)(s->quant * s->length) / desired) - data->quant;  
1582    
1583              if (rc->pquant_error[data->quant] >= 1.0) {          /* count again and safe the length/position */
1584                                  rc->pquant_error[data->quant] -= 1.0;  
1585                                  ++data->quant;          num_scenes = 0;
1586            last_scene = -999;
1587            for (i=0; i<rc->num_frames; i++) {
1588                    if ((rc->stats[i].type == XVID_TYPE_IVOP) && (i-last_scene>min_scenelength)) {
1589                            if (num_scenes>0) {
1590                                    scenelength[num_scenes-1]=i-last_scene;
1591                          }                          }
1592                            scenestart[num_scenes]=i;
1593                            num_scenes++;
1594                            last_scene = i;
1595                  }                  }
1596          }          }
1597            scenelength[num_scenes-1]=i-last_scene;
1598    
1599            /* second step: check for each scene, how much we can scale its frames up or
1600             * down such that the VBV restriction is just fulfilled */
1601    #define R(k,n) (((n)+1-(k))*r0)     /* how much enters the buffer between frame k and n */
1602            for (l=0; l<num_scenes;l++) {
1603                    const int start = scenestart[l];
1604                    const int length = scenelength[l];
1605                    twopass_stat_t * frames = &rc->stats[start];
1606    
1607      /* cap to min/max quant */                  float S0n,Skn;
1608                    float f,minf = 99999.f;
1609    
1610      if (data->quant < rc->param.min_quant[s->type-1]) {                  S0n=0.;
1611          data->quant = rc->param.min_quant[s->type-1];                  for (n=0;n<=length-1;n++) {
1612      }else if (data->quant > rc->param.max_quant[s->type-1]) {                          S0n += frames[n].scaled_length;
1613          data->quant = rc->param.max_quant[s->type-1];  
1614                            k = 0;
1615                            Skn = S0n;
1616                            f = (R(k,n-1) + (vbv_initial - vbv_low)) / Skn;
1617                            if (f < minf)
1618                                    minf = f;
1619    
1620                            for (k=1;k<=n;k++) {
1621                                    Skn -= frames[k].scaled_length;
1622    
1623                                    f = (R(k,n-1) + (vbv_size - vbv_low)) / Skn;
1624                                    if (f < minf)
1625                                            minf = f;
1626                            }
1627      }      }
1628    
1629      /* subsequent p/b frame quants can only be +- 2 */                  /* special case: at the end, fill buffer up to vbv_initial again
1630          if (s->type != XVID_TYPE_IVOP && rc->last_quant[s->type-1] && capped_to_max_framesize == 0) {                   *
1631                     * TODO: Allow other values for buffer fill between scenes
1632                     * e.g. if n=N is smallest f-value, then check for better value */
1633    
1634                  if (data->quant > rc->last_quant[s->type-1] + 2) {                  n=length;
1635                          data->quant = rc->last_quant[s->type-1] + 2;                  k=0;
1636                          DPRINTF(DPRINTF_RC, "p/b-frame quantizer prevented from rising too steeply");                  Skn = S0n;
1637                    f = R(k,n-1)/Skn;
1638                    if (f < minf)
1639                            minf = f;
1640    
1641                    for (k=1;k<=n-1;k++) {
1642                            Skn -= frames[k].scaled_length;
1643    
1644                            f = (R(k,n-1) + (vbv_initial - vbv_low)) / Skn;
1645                            if (f < minf)
1646                                    minf = f;
1647                    }
1648    
1649                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] Scene %d (Frames %d-%d): VBVfactor %f\n",
1650                                    l, start, start+length-1 , minf);
1651    
1652                    scenefactor[l] = minf;
1653            }
1654    #undef R
1655    
1656            /* last step: now we know of any scene how much it can be scaled up or down
1657             * without violating VBV. Next, distribute bits from the evil scenes to the
1658             * good ones */
1659            do {
1660                    float S_red = 0.f;    /* how much to redistribute */
1661                    float S_elig = 0.f;   /* sum of bit for those scenes you can still swallow something*/
1662                    float f_red;
1663                    int l;
1664    
1665                    /* check how much is wrong */
1666                    for (l=0;l<num_scenes;l++) {
1667                            const int start = scenestart[l];
1668                            const int length = scenelength[l];
1669                            twopass_stat_t * frames = &rc->stats[start];
1670    
1671                            /* exactly 1 means "don't touch this anymore!" */
1672                            if (scenefactor[l] == 1.)
1673                                    continue;
1674    
1675                            /* within limits */
1676                            if (scenefactor[l] > 1.) {
1677                                    for (n= 0; n < length; n++)
1678                                            S_elig += frames[n].scaled_length;
1679                            } else {
1680                                    /* underflowing segment */
1681                                    for (n= 0; n < length; n++) {
1682                                            float newbytes = (float)frames[n].scaled_length * scenefactor[l];
1683                                            S_red += (float)frames[n].scaled_length - (float)newbytes;
1684                                            frames[n].scaled_length =(int)newbytes;
1685                  }                  }
1686                  if (data->quant < rc->last_quant[s->type-1] - 2) {                                  scenefactor[l] = 1.f;
                         data->quant = rc->last_quant[s->type-1] - 2;  
                         DPRINTF(DPRINTF_RC, "p/b-frame quantizer prevented from falling too steeply");  
1687                  }                  }
1688          }          }
1689    
1690          if (capped_to_max_framesize == 0) {                  /* no more underflows */
1691          rc->last_quant[s->type-1] = data->quant;                  if (S_red < 1.f)
1692                            break;
1693    
1694                    if (S_elig < 1.f) {
1695                            DPRINTF(XVID_DEBUG_RC, "[xvid rc] Everything underflowing.\n");
1696                            free(scenefactor);
1697                            free(scenestart);
1698                            free(scenelength);
1699                            return(-2);
1700                    }
1701    
1702                    f_red = (1.f + S_red/S_elig);
1703    
1704                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] Moving %.0f kB to avoid buffer underflow, correction factor: %.5f\n",
1705                                    S_red/1024.f, f_red);
1706    
1707                    violation=0;
1708                    /* scale remaining scenes up to meet total size */
1709                    for (l=0; l<num_scenes; l++) {
1710                            const int start = scenestart[l];
1711                            const int length = scenelength[l];
1712                            twopass_stat_t * frames = &rc->stats[start];
1713    
1714                            if (scenefactor[l] == 1.)
1715                                    continue;
1716    
1717                            /* there shouldn't be any segments with factor<1 left, so all the rest is >1 */
1718                            for (n= 0; n < length; n++) {
1719                                    frames[n].scaled_length = (int)(frames[n].scaled_length * f_red + 0.5);
1720          }          }
1721    
1722          return 0;                          scenefactor[l] /= f_red;
1723                            if (scenefactor[l] < 1.f)
1724                                    violation=1;
1725  }  }
1726    
1727            } while (violation);
1728    
1729            free(scenefactor);
1730            free(scenestart);
1731            free(scenelength);
1732            return(0);
1733    }
1734    
 static int rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)  
 {  
     stat_t * s = &rc->stats[data->frame_num];  
1735    
1736      if (data->frame_num >= rc->num_frames) {  /*****************************************************************************
1737          /* insufficent stats data */   * Still more low level stuff (nothing to do with stats treatment)
1738          return 0;   ****************************************************************************/
1739      }  
1740    /* This function returns an allocated string containing a complete line read
1741     * from the file starting at the current position */
1742    static char *
1743    readline(FILE *f)
1744    {
1745            char *buffer = NULL;
1746            int buffer_size = 0;
1747            int pos = 0;
1748    
1749      rc->quant_count[data->quant]++;          do {
1750                    int c;
1751    
1752      if (data->type == XVID_TYPE_IVOP) {                  /* Read a character from the stream */
1753          int kfdiff = (rc->keyframe_locations[rc->KF_idx] -      rc->keyframe_locations[rc->KF_idx - 1]);                  c = fgetc(f);
1754    
1755          rc->overflow += rc->KFoverflow;                  /* Is that EOF or new line ? */
1756          rc->KFoverflow = s->desired_length - data->length;                  if(c == EOF || c == '\n')
1757                            break;
1758    
1759          if (kfdiff > 1) {  // non-consecutive keyframes                  /* Do we have to update buffer ? */
1760              rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);                  if(pos >= buffer_size - 1) {
1761          }else{ // consecutive keyframes                          buffer_size += BUF_SZ;
1762                          rc->overflow += rc->KFoverflow;                          buffer = (char*)realloc(buffer, buffer_size);
1763                          rc->KFoverflow = 0;                          if (buffer == NULL)
1764                          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;  
1765      }      }
1766    
1767      printf("[%i] quant:%i stats1:%i scaled:%i actual:%i overflow:%i\n",                  buffer[pos] = c;
1768          data->frame_num,                  pos++;
1769          data->quant,          } while(1);
         s->length,  
         s->scaled_length,  
         data->length,  
         rc->overflow);  
1770    
1771      return(0);          /* Read \n or EOF */
1772            if (buffer == NULL) {
1773                    /* EOF, so we reached the end of the file, return NULL */
1774                    if(feof(f))
1775                            return(NULL);
1776    
1777                    /* Just an empty line with just a newline, allocate a 1 byte buffer to
1778                     * store a zero length string */
1779                    buffer = (char*)malloc(1);
1780                    if(buffer == NULL)
1781                            return(NULL);
1782  }  }
1783    
1784            /* Zero terminated string */
1785            buffer[pos] = '\0';
1786    
1787            return(buffer);
1788    }
1789    
1790  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
1791     * string */
1792    static char *
1793    skipspaces(char *string)
1794  {  {
1795      switch(opt)          const char spaces[] =
1796      {      {
1797      case XVID_PLG_INFO :                          ' ','\t','\0'
1798          return 0;                  };
1799            const char *spacechar = spaces;
1800    
1801            if (string == NULL) return(NULL);
1802    
1803            while (*string != '\0') {
1804                    /* Test against space chars */
1805                    while (*spacechar != '\0') {
1806                            if (*string == *spacechar) {
1807                                    string++;
1808                                    spacechar = spaces;
1809                                    break;
1810                            }
1811                            spacechar++;
1812                    }
1813    
1814      case XVID_PLG_CREATE :                  /* No space char */
1815          return rc_2pass2_create((xvid_plg_create_t*)param1, param2);                  if (*spacechar == '\0') return(string);
1816            }
1817    
1818      case XVID_PLG_DESTROY :          return(string);
1819          return rc_2pass2_destroy((rc_2pass2_t*)handle, (xvid_plg_destroy_t*)param1);  }
1820    
1821      case XVID_PLG_BEFORE :  /* This function returns a boolean that tells if the string is only a
1822          return rc_2pass2_before((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);   * comment */
1823    static int
1824    iscomment(char *string)
1825    {
1826            const char comments[] =
1827                    {
1828                            '#',';', '%', '\0'
1829                    };
1830            const char *cmtchar = comments;
1831            int iscomment = 0;
1832    
1833            if (string == NULL) return(1);
1834    
1835            string = skipspaces(string);
1836    
1837            while(*cmtchar != '\0') {
1838                    if(*string == *cmtchar) {
1839                            iscomment = 1;
1840                            break;
1841                    }
1842                    cmtchar++;
1843            }
1844    
1845      case XVID_PLG_AFTER :          return(iscomment);
         return rc_2pass2_after((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);  
1846      }      }
1847    
1848      return XVID_ERR_FAIL;  #if 0
1849    static void
1850    stats_print(rc_2pass2_t * rc)
1851    {
1852            int i;
1853            const char frame_type[4] = { 'i', 'p', 'b', 's'};
1854    
1855            for (i=0; i<rc->num_frames; i++) {
1856                    twopass_stat_t *s = &rc->stats[i];
1857                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- frame:%d type:%c quant:%d stats:%d scaled:%d desired:%d actual:%d overflow(%c):%.2f\n",
1858                                    i, frame_type[s->type-1], -1, s->length, s->scaled_length,
1859                                    s->desired_length, -1, frame_type[s->type-1], -1.0f);
1860            }
1861  }  }
1862    #endif
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