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revision 1038, Thu May 22 16:36:07 2003 UTC revision 1267, Wed Dec 17 15:16:16 2003 UTC
# Line 1  Line 1 
1  /******************************************************************************  /******************************************************************************
2   *   *
3   * XviD Bit Rate Controller Library   * XviD Bit Rate Controller Library
4   * - VBR 2 pass bitrate controler implementation -   *  - VBR 2 pass bitrate controller implementation -
5   *   *
6   * Copyright (C)      2002 Foxer <email?>   * Copyright (C)      2002 Foxer <email?>
7   *                    2002 Dirk Knop <dknop@gwdg.de>   *                    2002 Dirk Knop <dknop@gwdg.de>
# Line 25  Line 25 
25   * along with this program; if not, write to the Free Software   * along with this program; if not, write to the Free Software
26   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
27   *   *
28   * $Id: plugin_2pass2.c,v 1.1.2.8 2003-05-22 16:36:07 edgomez Exp $   * $Id: plugin_2pass2.c,v 1.1.2.31 2003-12-17 15:16:16 edgomez Exp $
29   *   *
30   *****************************************************************************/   *****************************************************************************/
31    
32    #define BQUANT_PRESCALE
33    #undef COMPENSATE_FORMULA
34    
35  #include <stdio.h>  #include <stdio.h>
36  #include <math.h>  #include <math.h>
37    #include <limits.h>
 #define RAD2DEG 57.295779513082320876798154814105  
 #define DEG2RAD 0.017453292519943295769236907684886  
38    
39  #include "../xvid.h"  #include "../xvid.h"
40  #include "../image/image.h"  #include "../image/image.h"
41    
42    /*****************************************************************************
43     * Some default settings
44     ****************************************************************************/
45    
46    #define DEFAULT_KEYFRAME_BOOST 0
47    #define DEFAULT_OVERFLOW_CONTROL_STRENGTH 10
48    #define DEFAULT_CURVE_COMPRESSION_HIGH 0
49    #define DEFAULT_CURVE_COMPRESSION_LOW 0
50    #define DEFAULT_MAX_OVERFLOW_IMPROVEMENT 10
51    #define DEFAULT_MAX_OVERFLOW_DEGRADATION 10
52    
53    /* Keyframe settings */
54    #define DEFAULT_KFREDUCTION 20
55    #define DEFAULT_KFTHRESHOLD 1
56    
57    /*****************************************************************************
58     * Some default constants (can be tuned)
59     ****************************************************************************/
60    
61    /* Specify the invariant part of the headers bits (header+MV)
62     * as  hlength/cst */
63    #define INVARIANT_HEADER_PART_IVOP 1 /* factor 1.0f   */
64    #define INVARIANT_HEADER_PART_PVOP 2 /* factor 0.5f   */
65    #define INVARIANT_HEADER_PART_BVOP 8 /* factor 0.125f */
66    
67    /*****************************************************************************
68     * Structures
69     ****************************************************************************/
70    
71    /* Statistics */
72  typedef struct {  typedef struct {
73      int type;               /* first pass type */      int type;               /* first pass type */
74      int quant;              /* first pass quant */      int quant;              /* first pass quant */
75          int blks[3];                    /* k,m,y blks */          int blks[3];                    /* k,m,y blks */
76      int length;             /* first pass length */      int length;             /* first pass length */
77            int invariant;          /* what we assume as being invariant between the two passes, it's a sub part of header + MV bits */
78      int scaled_length;      /* scaled length */      int scaled_length;      /* scaled length */
79      int desired_length;     /* desired length; calcuated during encoding */          int desired_length;     /* desired length; calculated during encoding */
80            int error;
81    
82      int zone_mode;   /* XVID_ZONE_xxx */      int zone_mode;   /* XVID_ZONE_xxx */
83      double weight;      double weight;
84  } stat_t;  } twopass_stat_t;
   
85    
86    /* Context struct */
   
 /* context struct */  
87  typedef struct  typedef struct
88  {  {
89      xvid_plugin_2pass2_t param;      xvid_plugin_2pass2_t param;
90    
91      /* constant statistical data */          /*----------------------------------
92             * constant statistical data
93             *--------------------------------*/
94    
95            /* Number of frames of the sequence */
96          int num_frames;          int num_frames;
97    
98            /* Number of Intra frames of the sequence */
99      int num_keyframes;      int num_keyframes;
     uint64_t target;    /* target filesize */  
100    
101      int count[3];   /* count of each frame types */          /* Target filesize to reach */
102      uint64_t tot_length[3];  /* total length of each frame types */          uint64_t target;
     double avg_length[3];   /* avg */  
     int min_length[3];  /* min frame length of each frame types */  
     uint64_t tot_scaled_length[3];  /* total scaled length of each frame type */  
     int max_length;     /* max frame size */  
   
     /* zone statistical data */  
     double avg_weight;  /* average weight */  
     int64_t tot_quant;   /* total length used by XVID_ZONE_QUANT zones */  
   
   
     double curve_comp_scale;  
     double movie_curve;  
   
         double alt_curve_low;  
         double alt_curve_high;  
         double alt_curve_low_diff;  
         double alt_curve_high_diff;  
     double alt_curve_curve_bias_bonus;  
         double alt_curve_mid_qual;  
         double alt_curve_qual_dev;  
103    
104      /* dynamic */          /* Count of each frame types */
105            int count[3];
106    
107      int * keyframe_locations;          /* Total length of each frame types (1st pass) */
108      stat_t * stats;          uint64_t tot_length[3];
109            uint64_t tot_invariant[3];
110    
111            /* Average length of each frame types (used first for 1st pass data and
112             * then for scaled averages */
113            double avg_length[3];
114    
115            /* Minimum frame length allowed for each frame type */
116            int min_length[3];
117    
118            /* Total bytes per frame type once the curve has been scaled
119             * NB: advanced parameters do not change this value. This field
120             *     represents the total scaled w/o any advanced settings */
121            uint64_t tot_scaled_length[3];
122    
123            /* Maximum observed frame size observed during the first pass, the RC
124             * will try tp force all frame sizes in the second pass to be under that
125             * limit */
126            int max_length;
127    
128      double pquant_error[32];          /*----------------------------------
129      double bquant_error[32];           * Zones statistical data
130      int quant_count[32];           *
131      int last_quant[3];           * ToDo: Fix zones, current
132             *       implementation is buggy
133             *--------------------------------*/
134    
135            /* Average weight of the zones */
136            double avg_weight;
137    
138            /* Total length used by XVID_ZONE_QUANT zones */
139            uint64_t tot_quant;
140            uint64_t tot_quant_invariant;
141    
142            /*----------------------------------
143             * Advanced settings helper ratios
144             *--------------------------------*/
145    
146            /* This the ratio that has to be applied to all p/b frames in order
147             * to reserve/retrieve bits for/from keyframe boosting and consecutive
148             * keyframe penalty */
149            double pb_iboost_tax_ratio;
150    
151            /* This the ratio to apply to all b/p frames in order to respect the
152             * assymetric curve compression while respecting a target filesize
153             * NB: The assymetric delta gain has to be computed before this ratio
154             *     is applied, and then the delta is added to the scaled size */
155            double assymetric_tax_ratio;
156    
157            /*----------------------------------
158             * Data from the stats file kept
159             * into RAM for easy access
160             *--------------------------------*/
161    
162            /* Array of keyframe locations
163             * eg: rc->keyframe_locations[100] returns the frame number of the 100th
164             *     keyframe */
165            int *keyframe_locations;
166    
167      double curve_comp_error;          /* Index of the last keyframe used in the keyframe_location */
     int overflow;  
     int KFoverflow;  
     int KFoverflow_partial;  
168      int KF_idx;      int KF_idx;
169    
170      double fq_error;          /* Array of all 1st pass data file -- see the twopass_stat_t structure
171  } rc_2pass2_t;           * definition for more details */
172            twopass_stat_t * stats;
173    
174            /*----------------------------------
175             * Histerysis helpers
176             *--------------------------------*/
177    
178            /* This field holds the int2float conversion errors of each quant per
179             * frame type, this allow the RC to keep track of rouding error and thus
180             * increase or decrease the chosen quant according to this residue */
181            double quant_error[3][32];
182    
183            /* This fields stores the count of each quant usage per frame type
184             * No real role but for debugging */
185            int quant_count[3][32];
186    
187            /* Last valid quantizer used per frame type, it allows quantizer
188             * increament/decreament limitation in order to avoid big image quality
189             * "jumps" */
190            int last_quant[3];
191    
192            /*----------------------------------
193             * Overflow control
194             *--------------------------------*/
195    
196            /* Current overflow that has to be distributed to p/b frames */
197            double overflow;
198    
199            /* Total overflow for keyframes -- not distributed directly */
200            double KFoverflow;
201    
202            /* Amount of keyframe overflow to introduce to the global p/b frame
203             * overflow counter at each encoded frame */
204            double KFoverflow_partial;
205    
206            /* Unknown ???
207             * ToDo: description */
208            double fq_error;
209    
210  #define BUF_SZ 1024          /*----------------------------------
211  #define MAX_COLS    5           * Debug
212             *--------------------------------*/
213            double desired_total;
214            double real_total;
215    } rc_2pass2_t;
216    
217    
218  /* open stats file, and count num frames */  /*****************************************************************************
219     * Sub plugin functions prototypes
220     ****************************************************************************/
221    
222    static int rc_2pass2_create(xvid_plg_create_t * create, rc_2pass2_t ** handle);
223    static int rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data);
224    static int rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data);
225    static int rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy);
226    
227    /*****************************************************************************
228     * Plugin definition
229     ****************************************************************************/
230    
231  static int det_stats_length(rc_2pass2_t * rc, char * filename)  int
232    xvid_plugin_2pass2(void * handle, int opt, void * param1, void * param2)
233  {  {
234      FILE * f;          switch(opt) {
235      int n, ignore;          case XVID_PLG_INFO :
236      char type;          case XVID_PLG_FRAME :
   
     rc->num_frames = 0;  
     rc->num_keyframes = 0;  
   
     if ((f = fopen(filename, "rt")) == NULL)  
237          return 0;          return 0;
238    
239      while((n = fscanf(f, "%c %d %d %d %d %d %d\n",          case XVID_PLG_CREATE :
240          &type, &ignore, &ignore, &ignore, &ignore, &ignore, &ignore)) != EOF) {                  return rc_2pass2_create((xvid_plg_create_t*)param1, param2);
         if (type == 'i') {  
             rc->num_frames++;  
             rc->num_keyframes++;  
         }else if (type == 'p' || type == 'b' || type == 's') {  
             rc->num_frames++;  
         }  
     }  
241    
242      fclose(f);          case XVID_PLG_DESTROY :
243                    return rc_2pass2_destroy((rc_2pass2_t*)handle, (xvid_plg_destroy_t*)param1);
244    
245            case XVID_PLG_BEFORE :
246                    return rc_2pass2_before((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);
247    
248      return 1;          case XVID_PLG_AFTER :
249                    return rc_2pass2_after((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);
250  }  }
251    
252            return XVID_ERR_FAIL;
253    }
254    
255    /*****************************************************************************
256     * Sub plugin functions definitions
257     ****************************************************************************/
258    
259    /* First a few local helping function prototypes */
260    static  int statsfile_count_frames(rc_2pass2_t * rc, char * filename);
261    static  int statsfile_load(rc_2pass2_t *rc, char * filename);
262    static void zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create);
263    static void first_pass_stats_prepare_data(rc_2pass2_t * rc);
264    static void first_pass_scale_curve_internal(rc_2pass2_t *rc);
265    static void scaled_curve_apply_advanced_parameters(rc_2pass2_t * rc);
266    #if 0
267    static void stats_print(rc_2pass2_t * rc);
268    #endif
269    
270  /* open stats file(s) and read into rc->stats array */  /*----------------------------------------------------------------------------
271     *--------------------------------------------------------------------------*/
272    
273  static int load_stats(rc_2pass2_t *rc, char * filename)  static int
274    rc_2pass2_create(xvid_plg_create_t * create, rc_2pass2_t **handle)
275  {  {
276      FILE * f;          xvid_plugin_2pass2_t * param = (xvid_plugin_2pass2_t *)create->param;
277      int i, not_scaled;          rc_2pass2_t * rc;
278            int i;
279    
280            rc = malloc(sizeof(rc_2pass2_t));
281            if (rc == NULL)
282                    return XVID_ERR_MEMORY;
283    
284      if ((f = fopen(filename, "rt"))==NULL)          rc->param = *param;
         return 0;  
285    
286      i = 0;          /* Initialize all defaults */
287          not_scaled = 0;  #define _INIT(a, b) if((a) <= 0) (a) = (b)
288      while(i < rc->num_frames) {          /* Let's set our defaults if needed */
289          stat_t * s = &rc->stats[i];          _INIT(rc->param.keyframe_boost, DEFAULT_KEYFRAME_BOOST);
290          int n;          _INIT(rc->param.overflow_control_strength, DEFAULT_OVERFLOW_CONTROL_STRENGTH);
291          char type;          _INIT(rc->param.curve_compression_high, DEFAULT_CURVE_COMPRESSION_HIGH);
292            _INIT(rc->param.curve_compression_low, DEFAULT_CURVE_COMPRESSION_LOW);
293            _INIT(rc->param.max_overflow_improvement, DEFAULT_MAX_OVERFLOW_IMPROVEMENT);
294            _INIT(rc->param.max_overflow_degradation,  DEFAULT_MAX_OVERFLOW_DEGRADATION);
295    
296            /* Keyframe settings */
297            _INIT(rc->param.kfreduction, DEFAULT_KFREDUCTION);
298            _INIT(rc->param.kfthreshold, DEFAULT_KFTHRESHOLD);
299    #undef _INIT
300    
301                  s->scaled_length = 0;          /* Initialize some stuff to zero */
302          n = fscanf(f, "%c %d %d %d %d %d %d\n", &type, &s->quant, &s->blks[0], &s->blks[1], &s->blks[2], &s->length, &s->scaled_length);          for(i=0; i<3; i++) {
303          if (n == EOF) break;                  int j;
304                  if (n < 7) {                  for (j=0; j<32; j++) {
305                          not_scaled = 1;                          rc->quant_error[i][j] = 0;
306                            rc->quant_count[i][j] = 0;
307                  }                  }
   
         if (type == 'i') {  
             s->type = XVID_TYPE_IVOP;  
         }else if (type == 'p' || type == 's') {  
             s->type = XVID_TYPE_PVOP;  
         }else if (type == 'b') {  
             s->type = XVID_TYPE_BVOP;  
         }else{  /* unknown type */  
             DPRINTF(XVID_DEBUG_RC, "unknown stats frame type; assuming pvop\n");  
             s->type = XVID_TYPE_PVOP;  
308          }          }
309    
310          i++;          for (i=0; i<3; i++) rc->last_quant[i] = 0;
311      }  
312            rc->fq_error = 0;
313    
314      rc->num_frames = i;          /* Count frames (and intra frames) in the stats file, store the result into
315             * the rc structure */
316            if (statsfile_count_frames(rc, param->filename) == -1) {
317                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- ERROR: fopen %s failed\n", param->filename);
318                    free(rc);
319                    return(XVID_ERR_FAIL);
320            }
321    
322          fclose(f);          /* Allocate the stats' memory */
323            if ((rc->stats = malloc(rc->num_frames * sizeof(twopass_stat_t))) == NULL) {
324                    free(rc);
325                    return(XVID_ERR_MEMORY);
326            }
327    
328      return 1;          /* Allocate keyframes location's memory
329             * PS: see comment in pre_process0 for the +1 location requirement */
330            rc->keyframe_locations = malloc((rc->num_keyframes + 1) * sizeof(int));
331            if (rc->keyframe_locations == NULL) {
332                    free(rc->stats);
333                    free(rc);
334                    return(XVID_ERR_MEMORY);
335  }  }
336    
337            /* Load the first pass stats */
338            if (statsfile_load(rc, param->filename) == -1) {
339                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- ERROR: fopen %s failed\n", param->filename);
340                    free(rc->keyframe_locations);
341                    free(rc->stats);
342                    free(rc);
343                    return XVID_ERR_FAIL;
344            }
345    
346            /* Compute the target filesize */
347            if (rc->param.bitrate<0) {
348                    /* if negative, bitrate equals the target (in kbytes) */
349                    rc->target = ((uint64_t)(-rc->param.bitrate)) * 1024;
350            } else if (rc->num_frames  < create->fbase/create->fincr) {
351                    /* Source sequence is less than 1s long, we do as if it was 1s long */
352                    rc->target = rc->param.bitrate / 8;
353            } else {
354                    /* Target filesize = bitrate/8 * numframes / framerate */
355                    rc->target =
356                            ((uint64_t)rc->param.bitrate * (uint64_t)rc->num_frames * \
357                             (uint64_t)create->fincr) / \
358                            ((uint64_t)create->fbase * 8);
359            }
360    
361            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Frame rate: %d/%d (%ffps)\n",
362                            create->fbase, create->fincr,
363                            (double)create->fbase/(double)create->fincr);
364            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Number of frames: %d\n", rc->num_frames);
365            if(rc->param.bitrate>=0)
366                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Target bitrate: %ld\n", rc->param.bitrate);
367            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Target filesize: %lld\n", rc->target);
368    
369            /* Compensate the average frame overhead caused by the container */
370            rc->target -= rc->num_frames*rc->param.container_frame_overhead;
371            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Container Frame overhead: %d\n", rc->param.container_frame_overhead);
372            if(rc->param.container_frame_overhead)
373                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- New target filesize after container compensation: %lld\n", rc->target);
374    
375            /* Gathers some information about first pass stats:
376             *  - finds the minimum frame length for each frame type during 1st pass.
377             *     rc->min_size[]
378             *  - determines the maximum frame length observed (no frame type distinction).
379             *     rc->max_size
380             *  - count how many times each frame type has been used.
381             *     rc->count[]
382             *  - total bytes used per frame type
383             *     rc->tot_length[]
384             *  - total bytes considered invariant between the 2 passes
385             *  - store keyframe location
386             *     rc->keyframe_locations[]
387             */
388            first_pass_stats_prepare_data(rc);
389    
390  #if 0          /* When bitrate is not given it means it has been scaled by an external
391  static void print_stats(rc_2pass2_t * rc)           * application */
392  {          if (rc->param.bitrate) {
393      int i;                  /* Apply zone settings
394                     * - set rc->tot_quant which represents the total num of bytes spent in
395                     *   fixed quant zones
396                     * - set rc->tot_quant_invariant which represents the total num of bytes spent
397                     *   in fixed quant zones for headers */
398                    zone_process(rc, create);
399                    /* Perform internal curve scaling */
400                    first_pass_scale_curve_internal(rc);
401            } else {
402                    /* External scaling -- zones are ignored */
403      for (i = 0; i < rc->num_frames; i++) {      for (i = 0; i < rc->num_frames; i++) {
404          stat_t * s = &rc->stats[i];                          rc->stats[i].zone_mode = XVID_ZONE_WEIGHT;
405          DPRINTF(XVID_DEBUG_RC, "%i %i %i %i\n", s->type, s->quant, s->length, s->scaled_length);                          rc->stats[i].weight = 1.0;
406                    }
407                    rc->avg_weight = 1.0;
408                    rc->tot_quant = 0;
409      }      }
410    
411            /* Apply advanced curve options, and compute some parameters in order to
412             * shape the curve in the BEFORE/AFTER pair of functions */
413            scaled_curve_apply_advanced_parameters(rc);
414    
415            *handle = rc;
416            return(0);
417  }  }
 #endif  
418    
419  /* pre-process the statistics data  /*----------------------------------------------------------------------------
420      - for each type, count, tot_length, min_length, max_length   *--------------------------------------------------------------------------*/
     - set keyframes_locations  
 */  
421    
422  void pre_process0(rc_2pass2_t * rc)  static int
423    rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy)
424  {  {
425      int i,j;          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- target_total:%lld desired_total:%.2f (%.2f%%) actual_total:%.2f (%.2f%%)\n",
426                            rc->target,
427                            rc->desired_total,
428                            100*rc->desired_total/(double)rc->target,
429                            rc->real_total,
430                            100*rc->real_total/(double)rc->target);
431    
432      for (i=0; i<3; i++) {          free(rc->keyframe_locations);
433          rc->count[i]=0;          free(rc->stats);
434          rc->tot_length[i] = 0;          free(rc);
435          rc->last_quant[i] = 0;          return(0);
436      }      }
437    
438      for (i=j=0; i<rc->num_frames; i++) {  /*----------------------------------------------------------------------------
439          stat_t * s = &rc->stats[i];   *--------------------------------------------------------------------------*/
440    
441          rc->count[s->type-1]++;  static int
442          rc->tot_length[s->type-1] += s->length;  rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)
443    {
444            twopass_stat_t * s = &rc->stats[data->frame_num];
445            double dbytes;
446            double scaled_quant;
447            double overflow;
448            int capped_to_max_framesize = 0;
449    
450          if (i == 0 || s->length < rc->min_length[s->type-1]) {          /* This function is quite long but easy to understand. In order to simplify
451              rc->min_length[s->type-1] = s->length;           * the code path (a bit), we treat 3 cases that can return immediatly. */
         }  
452    
453          if (i == 0 || s->length > rc->max_length) {          /* First case: Another plugin has already set a quantizer */
454              rc->max_length = s->length;          if (data->quant > 0)
455          }                  return(0);
456    
457          if (s->type == XVID_TYPE_IVOP) {          /* Second case: insufficent stats data */
458              rc->keyframe_locations[j] = i;          if (data->frame_num >= rc->num_frames) {
459              j++;                  DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- stats file too short (now processing frame %d)",
460          }                          data->frame_num);
461                    return(0);
462      }      }
463    
464          /*          /* Third case: We are in a Quant zone */
465           * The "per sequence" overflow system considers a natural sequence to be          if (s->zone_mode == XVID_ZONE_QUANT) {
466           * formed by all frames between two iframes, so if we want to make sure                  rc->fq_error += s->weight;
467           * the system does not go nuts during last sequence, we force the last                  data->quant = (int)rc->fq_error;
468           * frame to appear in the keyframe locations array.                  rc->fq_error -= data->quant;
469           */  
470      rc->keyframe_locations[j] = i;                  s->desired_length = s->length;
471    
472                    return(0);
473  }  }
474    
475    
476  /* calculate zone weight "center" */          /*************************************************************************/
477            /*************************************************************************/
478            /*************************************************************************/
479    
480  static void zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)          /*-------------------------------------------------------------------------
481  {           * Frame bit allocation first part
482      int i,j;           *
483      int n = 0;           * First steps apply user settings, just like it is done in the theoritical
484             * scaled_curve_apply_advanced_parameters
485             *-----------------------------------------------------------------------*/
486    
487      rc->avg_weight = 0.0;          /* Set desired to what we are wanting to obtain for this frame */
488      rc->tot_quant = 0;          dbytes = (double)s->scaled_length;
489    
490            /* IFrame user settings*/
491            if (s->type == XVID_TYPE_IVOP) {
492                    /* Keyframe boosting -- All keyframes benefit from it */
493                    dbytes += dbytes*rc->param.keyframe_boost / 100;
494    
495      if (create->num_zones == 0) {  #if 0 /* ToDo: decide how to apply kfthresholding */
496          for (j = 0; j < rc->num_frames; j++) {  #endif
497              rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;          } else {
498              rc->stats[j].weight = 1.0;  
499                    /* P/S/B frames must reserve some bits for iframe boosting */
500                    dbytes *= rc->pb_iboost_tax_ratio;
501    
502                    /* Apply assymetric curve compression */
503                    if (rc->param.curve_compression_high || rc->param.curve_compression_low) {
504                            double assymetric_delta;
505    
506                            /* Compute the assymetric delta, this is computed before applying
507                             * the tax, as done in the pre_process function */
508                            if (dbytes > rc->avg_length[s->type-1])
509                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_high / 100.0;
510                            else
511                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_low  / 100.0;
512    
513                            /* Now we must apply the assymetric tax, else our curve compression
514                             * would not give a theoritical target size equal to what it is
515                             * expected */
516                            dbytes *= rc->assymetric_tax_ratio;
517    
518                            /* Now we can add the assymetric delta */
519                            dbytes += assymetric_delta;
520          }          }
         rc->avg_weight += rc->num_frames * 1.0;  
         n += rc->num_frames;  
521      }      }
522    
523            /* That is what we would like to have -- Don't put that chunk after
524             * overflow control, otherwise, overflow is counted twice and you obtain
525             * half sized bitrate sequences */
526            s->desired_length  = (int)dbytes;
527            rc->desired_total += dbytes;
528    
529      for(i=0; i < create->num_zones; i++) {          /*------------------------------------------------------------------------
530             * Frame bit allocation: overflow control part.
531             *
532             * Unlike the theoritical scaled_curve_apply_advanced_parameters, here
533             * it's real encoding and we need to make sure we don't go so far from
534             * what is our ideal scaled curve.
535             *-----------------------------------------------------------------------*/
536    
537          int next = (i+1<create->num_zones) ? create->zones[i+1].frame : rc->num_frames;          /* Compute the overflow we should compensate */
538            if (s->type != XVID_TYPE_IVOP) {
539                    double frametype_factor;
540                    double framesize_factor;
541    
542          if (i==0 && create->zones[i].frame > 0) {                  /* Take only the desired part of overflow */
543              for (j = 0; j < create->zones[i].frame && j < rc->num_frames; j++) {                  overflow = rc->overflow;
                 rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;  
                 rc->stats[j].weight = 1.0;  
             }  
             rc->avg_weight += create->zones[i].frame * 1.0;  
             n += create->zones[i].frame;  
         }  
544    
545          if (create->zones[i].mode == XVID_ZONE_WEIGHT) {                  /* Factor that will take care to decrease the overflow applied
546              for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {                   * according to the importance of this frame type in term of
547                  rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;                   * overall size */
548                  rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;                  frametype_factor  = rc->count[XVID_TYPE_IVOP-1]*rc->avg_length[XVID_TYPE_IVOP-1];
549              }                  frametype_factor += rc->count[XVID_TYPE_PVOP-1]*rc->avg_length[XVID_TYPE_PVOP-1];
550              next -= create->zones[i].frame;                  frametype_factor += rc->count[XVID_TYPE_BVOP-1]*rc->avg_length[XVID_TYPE_BVOP-1];
551              rc->avg_weight += (double)(next * create->zones[i].increment) / (double)create->zones[i].base;                  frametype_factor /= rc->count[s->type-1]*rc->avg_length[s->type-1];
552              n += next;                  frametype_factor  = 1/frametype_factor;
553          }else{  // XVID_ZONE_QUANT  
554              for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {                  /* Factor that will take care not to compensate too much for this frame
555                  rc->stats[j].zone_mode = XVID_ZONE_QUANT;                   * size */
556                  rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;                  framesize_factor  = dbytes;
557                  rc->tot_quant += rc->stats[j].length;                  framesize_factor /= rc->avg_length[s->type-1];
558              }  
559                    /* Treat only the overflow part concerned by this frame type and size */
560                    overflow *= frametype_factor;
561    #if 0
562                    /* Leave this one alone, as it impacts badly on quality */
563                    overflow *= framesize_factor;
564    #endif
565    
566                    /* Apply the overflow strength imposed by the user */
567                    overflow *= (rc->param.overflow_control_strength/100.0f);
568            } else {
569                    /* no overflow applied in IFrames because:
570                     *  - their role is important as they're references for P/BFrames.
571                     *  - there aren't much in typical sequences, so if an IFrame overflows too
572                     *    much, this overflow may impact the next IFrame too much and generate
573                     *    a sequence of poor quality frames */
574                    overflow = 0;
575          }          }
576    
577            /* Make sure we are not trying to compensate more overflow than we even have */
578            if (fabs(overflow) > fabs(rc->overflow))
579                    overflow = rc->overflow;
580    
581            /* Make sure the overflow doesn't make the frame size to get out of the range
582             * [-max_degradation..+max_improvment] */
583            if (overflow > dbytes*rc->param.max_overflow_improvement / 100) {
584                    if(overflow <= dbytes)
585                            dbytes += dbytes * rc->param.max_overflow_improvement / 100;
586                    else
587                            dbytes += overflow * rc->param.max_overflow_improvement / 100;
588            } else if (overflow < - dbytes * rc->param.max_overflow_degradation / 100) {
589                    dbytes -= dbytes * rc->param.max_overflow_degradation / 100;
590            } else {
591                    dbytes += overflow;
592      }      }
     rc->avg_weight = n>0 ? rc->avg_weight/n : 1.0;  
593    
594      DPRINTF(XVID_DEBUG_RC, "center_weight: %f (for %i frames);   fixed_bytes: %i\n", rc->avg_weight, n, rc->tot_quant);          /*-------------------------------------------------------------------------
595             * Frame bit allocation last part:
596             *
597             * Cap frame length so we don't reach neither bigger frame sizes than first
598             * pass nor smaller than the allowed minimum.
599             *-----------------------------------------------------------------------*/
600    
601            if (dbytes > s->length) {
602                    dbytes = s->length;
603            } else if (dbytes < rc->min_length[s->type-1]) {
604                    dbytes = rc->min_length[s->type-1];
605            } else if (dbytes > rc->max_length) {
606                    /* ToDo: this condition is always wrong as max_length == maximum frame
607                     * length of first pass, so the first condition already caps the frame
608                     * size... */
609                    capped_to_max_framesize = 1;
610                    dbytes = rc->max_length;
611                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- frame:%d Capped to maximum frame size\n",
612                                    data->frame_num);
613  }  }
614    
615            /*------------------------------------------------------------------------
616             * Desired frame length <-> quantizer mapping
617             *-----------------------------------------------------------------------*/
618    
619  /* scale the curve */  #ifdef BQUANT_PRESCALE
620            /* For bframes we prescale the quantizer to avoid too high quant scaling */
621            if(s->type == XVID_TYPE_BVOP) {
622    
623  static void internal_scale(rc_2pass2_t *rc)                  twopass_stat_t *b_ref = s;
 {  
         int64_t target  = rc->target - rc->tot_quant;  
         int64_t pass1_length = rc->tot_length[0] + rc->tot_length[1] + rc->tot_length[2] - rc->tot_quant;  
         int min_size[3];  
         double scaler;  
         int i;  
624    
625                    /* Find the reference frame */
626                    while(b_ref != &rc->stats[0] && b_ref->type == XVID_TYPE_BVOP)
627                            b_ref--;
628    
629                    /* Compute the original quant */
630                    s->quant  = 2*(100*s->quant - data->bquant_offset);
631                    s->quant += data->bquant_ratio - 1; /* to avoid rounding issues */
632                    s->quant  = s->quant/data->bquant_ratio - b_ref->quant;
633            }
634    #endif
635    
636          /* perform an initial scale pass.          /* Don't laugh at this very 'simple' quant<->size relationship, it
637             if a frame size is scaled underneath our hardcoded minimums, then we force the           * proves to be acurate enough for our algorithm */
638             frame size to the minimum, and deduct the original & scaled frmae length from the          scaled_quant = (double)s->quant*(double)s->length/(double)dbytes;
639             original and target total lengths */  
640    #ifdef COMPENSATE_FORMULA
641          min_size[0] = ((rc->stats[0].blks[0]*22) + 240) / 8;          /* We know xvidcore will apply the bframe formula again, so we compensate
642          min_size[1] = (rc->stats[0].blks[0] + 88) / 8;           * it right now to make sure we would not apply it twice */
643          min_size[2] = 8;          if(s->type == XVID_TYPE_BVOP) {
644    
645          scaler = (double)target / (double)pass1_length;                  twopass_stat_t *b_ref = s;
646    
647          if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {                  /* Find the reference frame */
648                  DPRINTF(XVID_DEBUG_RC, "undersize warning\n");                  while(b_ref != &rc->stats[0] && b_ref->type == XVID_TYPE_BVOP)
649          scaler = 1.0;                          b_ref--;
650    
651                    /* Compute the quant it would be if the core did not apply the bframe
652                     * formula */
653                    scaled_quant  = 100*scaled_quant - data->bquant_offset;
654                    scaled_quant += data->bquant_ratio - 1; /* to avoid rouding issues */
655                    scaled_quant /= data->bquant_ratio;
656          }          }
657    #endif
658    
659      DPRINTF(XVID_DEBUG_RC, "target=%i, tot_length=%i, scaler=%f\n", (int)target, (int)pass1_length, scaler);          /* Quantizer has been scaled using floating point operations/results, we
660             * must cast it to integer */
661          for (i=0; i<rc->num_frames; i++) {          data->quant = (int)scaled_quant;
                 stat_t * s = &rc->stats[i];  
                 int len;  
662    
663          if (s->zone_mode == XVID_ZONE_QUANT) {          /* Let's clip the computed quantizer, if needed */
664              s->scaled_length = s->length;          if (data->quant < 1) {
665          }else {                  data->quant = 1;
666                      len = (int)((double)s->length * scaler * s->weight / rc->avg_weight);          } else if (data->quant > 31) {
667                      if (len < min_size[s->type-1]) {            /* force frame size */                  data->quant = 31;
                             s->scaled_length = min_size[s->type-1];  
                             target -= s->scaled_length;  
                             pass1_length -= s->length;  
668                      }else{                      }else{
669                              s->scaled_length = 0;  
670                      }                  /* The frame quantizer has not been clipped, this appears to be a good
671                     * computed quantizer, do not loose quantizer decimal part that we
672                     * accumulate for later reuse when its sum represents a complete
673                     * unit. */
674                    rc->quant_error[s->type-1][data->quant] += scaled_quant - (double)data->quant;
675    
676                    if (rc->quant_error[s->type-1][data->quant] >= 1.0) {
677                            rc->quant_error[s->type-1][data->quant] -= 1.0;
678                            data->quant++;
679                    } else if (rc->quant_error[s->type-1][data->quant] <= -1.0) {
680                            rc->quant_error[s->type-1][data->quant] += 1.0;
681                            data->quant--;
682          }          }
683          }          }
684    
685      scaler = (double)target / (double)pass1_length;          /* Now we have a computed quant that is in the right quante range, with a
686      if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {           * possible +1 correction due to cumulated error. We can now safely clip
687                  DPRINTF(XVID_DEBUG_RC,"undersize warning\n");           * the quantizer again with user's quant ranges. "Safely" means the Rate
688                  scaler = 1.0;           * Control could learn more about this quantizer, this knowledge is useful
689             * for future frames even if it this quantizer won't be really used atm,
690             * that's why we don't perform this clipping earlier. */
691            if (data->quant < data->min_quant[s->type-1]) {
692                    data->quant = data->min_quant[s->type-1];
693            } else if (data->quant > data->max_quant[s->type-1]) {
694                    data->quant = data->max_quant[s->type-1];
695          }          }
696    
697          DPRINTF(XVID_DEBUG_RC, "target=%i, tot_length=%i, scaler=%f\n", (int)target, (int)pass1_length, scaler);          /* To avoid big quality jumps from frame to frame, we apply a "security"
698             * rule that makes |last_quant - new_quant| <= 2. This rule only applies
699          for (i=0; i<rc->num_frames; i++) {           * to predicted frames (P and B) */
700                  stat_t * s = &rc->stats[i];          if (s->type != XVID_TYPE_IVOP && rc->last_quant[s->type-1] && capped_to_max_framesize == 0) {
701    
702                  if (s->scaled_length==0) {      /* ignore frame with forced frame sizes */                  if (data->quant > rc->last_quant[s->type-1] + 2) {
703                          s->scaled_length = (int)((double)s->length * scaler * s->weight / rc->avg_weight);                          data->quant = rc->last_quant[s->type-1] + 2;
704                            DPRINTF(XVID_DEBUG_RC,
705                                            "[xvid rc] -- frame %d p/b-frame quantizer prevented from rising too steeply\n",
706                                            data->frame_num);
707                  }                  }
708                    if (data->quant < rc->last_quant[s->type-1] - 2) {
709                            data->quant = rc->last_quant[s->type-1] - 2;
710                            DPRINTF(XVID_DEBUG_RC,
711                                            "[xvid rc] -- frame:%d p/b-frame quantizer prevented from falling too steeply\n",
712                                            data->frame_num);
713          }          }
714  }  }
715    
716            /* We don't want to pollute the RC histerisis when our computed quant has
717             * been computed from a capped frame size */
718            if (capped_to_max_framesize == 0)
719                    rc->last_quant[s->type-1] = data->quant;
720    
721            /* Don't forget to force 1st pass frame type ;-) */
722            data->type = s->type;
723    
724            return 0;
725    }
726    
727    /*----------------------------------------------------------------------------
728     *--------------------------------------------------------------------------*/
729    
730  void pre_process1(rc_2pass2_t * rc)  static int
731    rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)
732  {  {
733      int i;          const char frame_type[4] = { 'i', 'p', 'b', 's'};
734      double total1, total2;          twopass_stat_t * s = &rc->stats[data->frame_num];
     uint64_t ivop_boost_total;  
735    
736      ivop_boost_total = 0;          /* Insufficent stats data */
737      rc->curve_comp_error = 0;          if (data->frame_num >= rc->num_frames)
738                    return 0;
     for (i=0; i<3; i++) {  
         rc->tot_scaled_length[i] = 0;  
     }  
739    
740      for (i=0; i<rc->num_frames; i++) {          /* Update the quantizer counter */
741          stat_t * s = &rc->stats[i];          rc->quant_count[s->type-1][data->quant]++;
742    
743          rc->tot_scaled_length[s->type-1] += s->scaled_length;          /* Update the frame type overflow */
744            if (data->type == XVID_TYPE_IVOP) {
745                    int kfdiff = 0;
746    
747          if (s->type == XVID_TYPE_IVOP) {                  if(rc->KF_idx != rc->num_frames -1) {
748              ivop_boost_total += s->scaled_length * rc->param.keyframe_boost / 100;                          kfdiff  = rc->keyframe_locations[rc->KF_idx+1];
749          }                          kfdiff -= rc->keyframe_locations[rc->KF_idx];
750      }      }
751    
752      rc->movie_curve = ((double)(rc->tot_scaled_length[XVID_TYPE_PVOP-1] + rc->tot_scaled_length[XVID_TYPE_BVOP-1] + ivop_boost_total) /                  /* Flush Keyframe overflow accumulator */
753                                          (rc->tot_scaled_length[XVID_TYPE_PVOP-1] + rc->tot_scaled_length[XVID_TYPE_BVOP-1]));                  rc->overflow += rc->KFoverflow;
754    
755      for(i=0; i<3; i++) {                  /* Store the frame overflow to the keyframe accumulator */
756          if (rc->count[i] == 0 || rc->movie_curve == 0) {                  rc->KFoverflow = s->desired_length - data->length;
757              rc->avg_length[i] = 1;  
758                    if (kfdiff > 1) {
759                            /* Non-consecutive keyframes case:
760                             * We can then divide this total keyframe overflow into equal parts
761                             * that we will distribute into regular overflow at each frame
762                             * between the sequence bounded by two IFrames */
763                            rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);
764          }else{          }else{
765              rc->avg_length[i] = rc->tot_scaled_length[i] / rc->count[i] / rc->movie_curve;                          /* Consecutive keyframes case:
766          }                           * Flush immediatly the keyframe overflow and reset keyframe
767                             * overflow */
768                            rc->overflow += rc->KFoverflow;
769                            rc->KFoverflow = 0;
770                            rc->KFoverflow_partial = 0;
771      }      }
772                    rc->KF_idx++;
773            } else {
774                    /* Accumulate the frame overflow */
775                    rc->overflow += s->desired_length - data->length;
776    
777      /* alt curve stuff here */                  /* Distribute part of the keyframe overflow */
778                    rc->overflow += rc->KFoverflow_partial;
779    
780      if (rc->param.use_alt_curve) {                  /* Don't forget to substract that same amount from the total keyframe
781          const double avg_pvop = rc->avg_length[XVID_TYPE_PVOP-1];                   * overflow */
782          const uint64_t tot_pvop = rc->tot_length[XVID_TYPE_PVOP-1];                  rc->KFoverflow -= rc->KFoverflow_partial;
783          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];  
784    
785                  rc->alt_curve_low = avg_pvop - avg_pvop * (double)rc->param.alt_curve_low_dist / 100.0;          rc->overflow += (s->error = s->desired_length - data->length);
786                  rc->alt_curve_low_diff = avg_pvop - rc->alt_curve_low;          rc->real_total += data->length;
                 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;  
787    
788          if (rc->param.alt_curve_use_auto) {          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",
789              if (tot_bvop + tot_pvop > tot_scaled_bvop + tot_scaled_pvop) {                          data->frame_num,
790                                  rc->param.alt_curve_min_rel_qual = (int)(100.0 - (100.0 - 100.0 /                          frame_type[data->type-1],
791                                          ((double)(tot_pvop + tot_bvop) / (double)(tot_scaled_pvop + tot_scaled_bvop))) * (double)rc->param.alt_curve_auto_str / 100.0);                          data->quant,
792                            s->length,
793                            s->scaled_length,
794                            s->desired_length,
795                            s->desired_length - s->error,
796                            -s->error,
797                            rc->overflow);
798    
799                                  if (rc->param.alt_curve_min_rel_qual < 20)          return(0);
                                         rc->param.alt_curve_min_rel_qual = 20;  
             }else{  
                                 rc->param.alt_curve_min_rel_qual = 100;  
             }  
800          }          }
                 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;  
801    
802          if (rc->param.alt_curve_low_dist > 100) {  /*****************************************************************************
803                          switch(rc->param.alt_curve_type) {   * Helper functions definition
804              case XVID_CURVE_SINE: // Sine Curve (high aggressiveness)   ****************************************************************************/
                                 rc->alt_curve_qual_dev *= 2.0 / (1.0 + sin(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff)));  
                                 rc->alt_curve_mid_qual = 1.0 - rc->alt_curve_qual_dev * sin(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff));  
                                 break;  
                         case XVID_CURVE_LINEAR: // Linear (medium aggressiveness)  
                                 rc->alt_curve_qual_dev *= 2.0 / (1.0 + avg_pvop / rc->alt_curve_low_diff);  
                                 rc->alt_curve_mid_qual = 1.0 - rc->alt_curve_qual_dev * avg_pvop / rc->alt_curve_low_diff;  
                                 break;  
                         case XVID_CURVE_COSINE: // Cosine Curve (low aggressiveness)  
                                 rc->alt_curve_qual_dev *= 2.0 / (1.0 + (1.0 - cos(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff))));  
                                 rc->alt_curve_mid_qual = 1.0 - rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff)));  
                         }  
                 }  
     }  
     /* --- */  
805    
806    /* Default buffer size for reading lines */
807    #define BUF_SZ   1024
808    
809      total1=total2=0;  /* Helper functions for reading/parsing the stats file */
810      for (i=0; i<rc->num_frames; i++) {  static char *skipspaces(char *string);
811          stat_t * s = &rc->stats[i];  static int iscomment(char *string);
812    static char *readline(FILE *f);
813    
814    /* This function counts the number of frame entries in the stats file
815     * It also counts the number of I Frames */
816    static int
817    statsfile_count_frames(rc_2pass2_t * rc, char * filename)
818    {
819            FILE * f;
820            char *line;
821            int lines;
822    
823          if (s->type != XVID_TYPE_IVOP) {          rc->num_frames = 0;
824              double dbytes,dbytes2;          rc->num_keyframes = 0;
825    
826              dbytes = s->scaled_length / rc->movie_curve;          if ((f = fopen(filename, "rb")) == NULL)
827              dbytes2 = 0; /* XXX: warning */                  return(-1);
             total1 += dbytes;  
             if (s->type == XVID_TYPE_BVOP)  
                 dbytes *= rc->avg_length[XVID_TYPE_PVOP-1] / rc->avg_length[XVID_TYPE_BVOP-1];  
828    
829              if (rc->param.use_alt_curve) {          lines = 0;
830                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {          while ((line = readline(f)) != NULL) {
831    
832                      if (dbytes >= rc->alt_curve_high) {                  char *ptr;
833                                                  dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev);                  char type;
834                      }else{                  int fields;
                                                 switch(rc->param.alt_curve_type) {  
                         case XVID_CURVE_SINE :  
                                                     dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * sin(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_high_diff)));  
                                                         break;  
                         case XVID_CURVE_LINEAR :  
                                                     dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) / rc->alt_curve_high_diff);  
                                                         break;  
                                                 case XVID_CURVE_COSINE :  
                                                     dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_high_diff))));  
                                                 }  
                                         }  
                 }else{  
                     if (dbytes <= rc->alt_curve_low) {  
                                                 dbytes2 = dbytes;  
                     }else{  
                                                 switch(rc->param.alt_curve_type) {  
                                                 case XVID_CURVE_SINE :  
                                                     dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * sin(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_low_diff)));  
                                                         break;  
                                                 case XVID_CURVE_LINEAR :  
                                                     dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) / rc->alt_curve_low_diff);  
                                                         break;  
                                                 case XVID_CURVE_COSINE :  
                                                     dbytes2 = dbytes * (rc->alt_curve_mid_qual + rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_low_diff))));  
                                                 }  
                                         }  
835    
836                  }                  lines++;
837    
838                    /* We skip spaces */
839                    ptr = skipspaces(line);
840    
841              }else{                  /* Skip coment lines or empty lines */
842                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                  if(iscomment(ptr) || *ptr == '\0') {
843                      dbytes2=((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_high / 100.0);                          free(line);
844                  }else{                          continue;
                                 dbytes2 = ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_low / 100.0);  
                 }  
845              }              }
846    
847              if (s->type == XVID_TYPE_BVOP) {                  /* Read the stat line from buffer */
848                              dbytes2 *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];                  fields = sscanf(ptr, "%c", &type);
849                              if (dbytes2 < rc->min_length[XVID_TYPE_BVOP-1])  
850                                      dbytes2 = rc->min_length[XVID_TYPE_BVOP-1];                  /* Valid stats files have at least 7 fields */
851              }else{                  if (fields == 1) {
852                              if (dbytes2 < rc->min_length[XVID_TYPE_PVOP-1])                          switch(type) {
853                                      dbytes2 = rc->min_length[XVID_TYPE_PVOP-1];                          case 'i':
854                            case 'I':
855                                    rc->num_keyframes++;
856                            case 'p':
857                            case 'P':
858                            case 'b':
859                            case 'B':
860                            case 's':
861                            case 'S':
862                                    rc->num_frames++;
863                                    break;
864                            default:
865                                    DPRINTF(XVID_DEBUG_RC,
866                                                    "[xvid rc] -- WARNING: L%d unknown frame type used (%c).\n",
867                                                    lines, type);
868              }              }
869              total2 += dbytes2;                  } else {
870                                    DPRINTF(XVID_DEBUG_RC,
871                                                    "[xvid rc] -- WARNING: L%d misses some stat fields (%d).\n",
872                                                    lines, 7-fields);
873          }          }
874    
875                    /* Free the line buffer */
876                    free(line);
877      }      }
878    
879      rc->curve_comp_scale = total1 / total2;          /* We are done with the file */
880            fclose(f);
881    
882      if (!rc->param.use_alt_curve) {          return(0);
         DPRINTF(XVID_DEBUG_RC, "middle frame size for asymmetric curve compression: %i\n",  
             (int)(rc->avg_length[XVID_TYPE_PVOP-1] * rc->curve_comp_scale));  
883      }      }
884    
885      if (rc->param.use_alt_curve) {  /* open stats file(s) and read into rc->stats array */
886          int bonus_bias = rc->param.alt_curve_bonus_bias;  static int
887          int oldquant = 1;  statsfile_load(rc_2pass2_t *rc, char * filename)
888    {
889            FILE * f;
890            int processed_entries;
891    
892              if (rc->param.alt_curve_use_auto_bonus_bias)          /* Opens the file */
893                      bonus_bias = rc->param.alt_curve_min_rel_qual;          if ((f = fopen(filename, "rb"))==NULL)
894                    return(-1);
895    
896              rc->alt_curve_curve_bias_bonus = (total1 - total2) * (double)bonus_bias / 100.0 / (double)(rc->num_frames /* - credits_frames */ - rc->num_keyframes);          processed_entries = 0;
897              rc->curve_comp_scale = ((total1 - total2) * (1.0 - (double)bonus_bias / 100.0) + total2) / total2;          while(processed_entries < rc->num_frames) {
898                    char type;
899                    int fields;
900                    twopass_stat_t * s = &rc->stats[processed_entries];
901                    char *line, *ptr;
902    
903                    /* Read the line from the file */
904                    if((line = readline(f)) == NULL)
905                            break;
906    
907          /* special info for alt curve:  bias bonus and quantizer thresholds */                  /* We skip spaces */
908                    ptr = skipspaces(line);
909    
910                  DPRINTF(XVID_DEBUG_RC, "avg scaled framesize:%i\n", (int)rc->avg_length[XVID_TYPE_PVOP-1]);                  /* Skip comment lines or empty lines */
911                  DPRINTF(XVID_DEBUG_RC, "bias bonus:%i bytes\n", (int)rc->alt_curve_curve_bias_bonus);                  if(iscomment(ptr) || *ptr == '\0') {
912                            free(line);
913                            continue;
914                    }
915    
916                  for (i=1; i <= (int)(rc->alt_curve_high*2)+1; i++) {                  /* Reset this field that is optional */
917              double curve_temp, dbytes;                  s->scaled_length = 0;
             int newquant;  
918    
919              dbytes = i;                  /* Convert the fields */
920                          if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                  fields = sscanf(ptr,
921                  if (dbytes >= rc->alt_curve_high) {                                                  "%c %d %d %d %d %d %d %d\n",
922                                          curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev);                                                  &type,
923                  }else{                                                  &s->quant,
924                                          switch(rc->param.alt_curve_type)                                                  &s->blks[0], &s->blks[1], &s->blks[2],
925                                          {                                                  &s->length, &s->invariant /* not really yet */,
926                                          case XVID_CURVE_SINE :                                                  &s->scaled_length);
927                                                  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)));  
928                                                  break;                  /* Free line buffer, we don't need it anymore */
929                                          case XVID_CURVE_LINEAR :                  free(line);
930                                                  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);  
931                    /* Fail silently, this has probably been warned in
932                     * statsfile_count_frames */
933                    if(fields != 7 && fields != 8)
934                            continue;
935    
936                    /* Convert frame type and compute the invariant length part */
937                    switch(type) {
938                    case 'i':
939                    case 'I':
940                            s->type = XVID_TYPE_IVOP;
941                            s->invariant /= INVARIANT_HEADER_PART_IVOP;
942                                                  break;                                                  break;
943                                          case XVID_CURVE_COSINE :                  case 'p':
944                                                  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))));                  case 'P':
945                                          }                  case 's':
946                                  }                  case 'S':
947                          }else{                          s->type = XVID_TYPE_PVOP;
948                  if (dbytes <= rc->alt_curve_low) {                          s->invariant /= INVARIANT_HEADER_PART_PVOP;
                                         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)));  
949                                                  break;                                                  break;
950                                          case XVID_CURVE_LINEAR :                  case 'b':
951                                                  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);                  case 'B':
952                            s->type = XVID_TYPE_BVOP;
953                            s->invariant /= INVARIANT_HEADER_PART_BVOP;
954                                                  break;                                                  break;
955                                          case XVID_CURVE_COSINE :                  default:
956                                                  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))));                          /* Same as before, fail silently */
957                                          }                          continue;
958                                  }                                  }
                         }  
   
                         if (rc->movie_curve > 1.0)  
                                 dbytes *= rc->movie_curve;  
959    
960                          newquant = (int)(dbytes * 2.0 / (curve_temp * rc->curve_comp_scale + rc->alt_curve_curve_bias_bonus));                  /* Ok it seems it's been processed correctly */
961                          if (newquant > 1) {                  processed_entries++;
                                 if (newquant != oldquant) {  
                     int percent = (int)((i - rc->avg_length[XVID_TYPE_PVOP-1]) * 100.0 / rc->avg_length[XVID_TYPE_PVOP-1]);  
                                         oldquant = newquant;  
                                         DPRINTF(XVID_DEBUG_RC, "quant:%i threshold at %i : %i percent\n", newquant, i, percent);  
                                 }  
                         }  
962                  }                  }
963    
964      }          /* Close the file */
965            fclose(f);
966    
967      rc->overflow = 0;          return(0);
     rc->KFoverflow = 0;  
     rc->KFoverflow_partial = 0;  
     rc->KF_idx = 1;  
968  }  }
969    
970    /* pre-process the statistics data
971     * - for each type, count, tot_length, min_length, max_length
972     * - set keyframes_locations */
973  static int rc_2pass2_create(xvid_plg_create_t * create, rc_2pass2_t ** handle)  static void
974    first_pass_stats_prepare_data(rc_2pass2_t * rc)
975  {  {
976      xvid_plugin_2pass2_t * param = (xvid_plugin_2pass2_t *)create->param;          int i,j;
     rc_2pass2_t * rc;  
     int i;  
977    
978      rc = malloc(sizeof(rc_2pass2_t));          /* *rc fields initialization
979      if (rc == NULL)           * NB: INT_MAX and INT_MIN are used in order to be immediately replaced
980          return XVID_ERR_MEMORY;           *     with real values of the 1pass */
981            for (i=0; i<3; i++) {
982                    rc->count[i]=0;
983                    rc->tot_length[i] = 0;
984                    rc->tot_invariant[i] = 0;
985                    rc->min_length[i] = INT_MAX;
986            }
987    
988      rc->param = *param;          rc->max_length = INT_MIN;
989    
990      if (rc->param.keyframe_boost <= 0) rc->param.keyframe_boost = 0;          /* Loop through all frames and find/compute all the stuff this function
991      if (rc->param.payback_method <= 0) rc->param.payback_method = XVID_PAYBACK_PROP;           * is supposed to do */
992      if (rc->param.bitrate_payback_delay <= 0) rc->param.bitrate_payback_delay = 250;          for (i=j=0; i<rc->num_frames; i++) {
993      if (rc->param.curve_compression_high <= 0) rc->param.curve_compression_high = 0;                  twopass_stat_t * s = &rc->stats[i];
     if (rc->param.curve_compression_low <= 0) rc->param.curve_compression_low = 0;  
     if (rc->param.max_overflow_improvement <= 0) rc->param.max_overflow_improvement = 60;  
     if (rc->param.max_overflow_degradation <= 0) rc->param.max_overflow_degradation = 60;  
   
     if (rc->param.use_alt_curve <= 0) rc->param.use_alt_curve = 0;  
     if (rc->param.alt_curve_high_dist <= 0) rc->param.alt_curve_high_dist = 500;  
     if (rc->param.alt_curve_low_dist <= 0) rc->param.alt_curve_low_dist = 90;  
     if (rc->param.alt_curve_use_auto <= 0) rc->param.alt_curve_use_auto = 1;  
     if (rc->param.alt_curve_auto_str <= 0) rc->param.alt_curve_auto_str = 30;  
     if (rc->param.alt_curve_type <= 0) rc->param.alt_curve_type = XVID_CURVE_LINEAR;  
     if (rc->param.alt_curve_min_rel_qual <= 0) rc->param.alt_curve_min_rel_qual = 50;  
     if (rc->param.alt_curve_use_auto_bonus_bias <= 0) rc->param.alt_curve_use_auto_bonus_bias = 1;  
     if (rc->param.alt_curve_bonus_bias <= 0) rc->param.alt_curve_bonus_bias = 50;  
   
     if (rc->param.kftreshold <= 0) rc->param.kftreshold = 10;  
     if (rc->param.kfreduction <= 0) rc->param.kfreduction = 20;  
     if (rc->param.min_key_interval <= 0) rc->param.min_key_interval = 300;  
994    
995      if (!det_stats_length(rc, param->filename)){                  rc->count[s->type-1]++;
996          DPRINTF(XVID_DEBUG_RC,"fopen %s failed\n", param->filename);                  rc->tot_length[s->type-1] += s->length;
997          free(rc);                  rc->tot_invariant[s->type-1] += s->invariant;
         return XVID_ERR_FAIL;  
     }  
998    
999      if ((rc->stats = malloc(rc->num_frames * sizeof(stat_t))) == NULL) {                  if (s->length < rc->min_length[s->type-1]) {
1000          free(rc);                          rc->min_length[s->type-1] = s->length;
         return XVID_ERR_MEMORY;  
1001      }      }
1002    
1003      /*                  if (s->length > rc->max_length) {
1004           * We need an extra location because we do as if the last frame were an                          rc->max_length = s->length;
          * IFrame. This is needed because our code consider that frames between  
          * 2 IFrames form a natural sequence. So we store last frame as a  
          * keyframe location.  
          */  
     if ((rc->keyframe_locations = malloc((rc->num_keyframes + 1) * sizeof(int))) == NULL) {  
         free(rc->stats);  
         free(rc);  
         return XVID_ERR_MEMORY;  
1005      }      }
1006    
1007      if (!load_stats(rc, param->filename)) {                  if (s->type == XVID_TYPE_IVOP) {
1008          DPRINTF(XVID_DEBUG_RC,"fopen %s failed\n", param->filename);                          rc->keyframe_locations[j] = i;
1009          free(rc->keyframe_locations);                          j++;
         free(rc->stats);  
         free(rc);  
         return XVID_ERR_FAIL;  
1010      }      }
   
     /* pre-process our stats */  
   
         if (rc->num_frames  < create->fbase/create->fincr) {  
                 rc->target = rc->param.bitrate / 8;     /* one second */  
         }else{  
                 rc->target = (rc->param.bitrate * rc->num_frames * create->fincr) / (create->fbase * 8);  
1011          }          }
1012    
1013      DPRINTF(XVID_DEBUG_RC, "rc->target : %i\n", rc->target);          /* NB:
1014             * The "per sequence" overflow system considers a natural sequence to be
1015             * formed by all frames between two iframes, so if we want to make sure
1016             * the system does not go nuts during last sequence, we force the last
1017             * frame to appear in the keyframe locations array. */
1018            rc->keyframe_locations[j] = i;
1019    
1020  #if 0          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Min 1st pass IFrame length: %d\n", rc->min_length[0]);
1021          rc->target -= rc->num_frames*24;        /* avi file header */          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Min 1st pass PFrame length: %d\n", rc->min_length[1]);
1022  #endif          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Min 1st pass BFrame length: %d\n", rc->min_length[2]);
1023    }
1024    
1025    /* calculate zone weight "center" */
1026    static void
1027    zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)
1028    {
1029            int i,j;
1030            int n = 0;
1031    
1032          pre_process0(rc);          rc->avg_weight = 0.0;
1033            rc->tot_quant = 0;
1034            rc->tot_quant_invariant = 0;
1035    
1036          if (rc->param.bitrate) {          if (create->num_zones == 0) {
1037          zone_process(rc, create);                  for (j = 0; j < rc->num_frames; j++) {
1038                  internal_scale(rc);                          rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1039      }else{                          rc->stats[j].weight = 1.0;
         /* external scaler: ignore zone */  
         for (i=0;i<rc->num_frames;i++) {  
             rc->stats[i].zone_mode = XVID_ZONE_WEIGHT;  
             rc->stats[i].weight = 1.0;  
1040          }          }
1041          rc->avg_weight = 1.0;                  rc->avg_weight += rc->num_frames * 1.0;
1042          rc->tot_quant = 0;                  n += rc->num_frames;
1043      }      }
         pre_process1(rc);  
1044    
     for (i=0; i<32;i++) {  
         rc->pquant_error[i] = 0;  
         rc->bquant_error[i] = 0;  
         rc->quant_count[i] = 0;  
     }  
1045    
1046      rc->fq_error = 0;          for(i=0; i < create->num_zones; i++) {
1047    
1048      *handle = rc;                  int next = (i+1<create->num_zones) ? create->zones[i+1].frame : rc->num_frames;
         return(0);  
 }  
1049    
1050                    if (i==0 && create->zones[i].frame > 0) {
1051                            for (j = 0; j < create->zones[i].frame && j < rc->num_frames; j++) {
1052                                    rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1053                                    rc->stats[j].weight = 1.0;
1054                            }
1055                            rc->avg_weight += create->zones[i].frame * 1.0;
1056                            n += create->zones[i].frame;
1057                    }
1058    
1059  static int rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy)                  if (create->zones[i].mode == XVID_ZONE_WEIGHT) {
1060  {                          for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {
1061      free(rc->keyframe_locations);                                  rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1062      free(rc->stats);                                  rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;
1063          free(rc);                          }
1064          return(0);                          next -= create->zones[i].frame;
1065                            rc->avg_weight += (double)(next * create->zones[i].increment) / (double)create->zones[i].base;
1066                            n += next;
1067                    } else{  /* XVID_ZONE_QUANT */
1068                            for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {
1069                                    rc->stats[j].zone_mode = XVID_ZONE_QUANT;
1070                                    rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;
1071                                    rc->tot_quant += rc->stats[j].length;
1072                                    rc->tot_quant_invariant += rc->stats[j].invariant;
1073  }  }
1074                    }
1075            }
1076            rc->avg_weight = n>0 ? rc->avg_weight/n : 1.0;
1077    
1078            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- center_weight:%f (for %d frames)  fixed_bytes:%d\n", rc->avg_weight, n, rc->tot_quant);
1079    }
1080    
1081    
1082  static int rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)  /* scale the curve */
1083    static void
1084    first_pass_scale_curve_internal(rc_2pass2_t *rc)
1085  {  {
1086      stat_t * s = &rc->stats[data->frame_num];          int64_t target;
1087      int overflow;          int64_t pass1_length;
1088      int desired;          int64_t total_invariant;
1089      double dbytes;          double scaler;
1090      double curve_temp;          int i, num_MBs;
     int capped_to_max_framesize = 0;  
   
         /*  
          * This function is quite long but easy to understand. In order to simplify  
          * the code path (a bit), we treat 3 cases that can return immediatly.  
          */  
   
         /* First case: Another plugin has already set a quantizer */  
     if (data->quant > 0)  
                 return(0);  
1091    
1092          /* Second case: We are in a Quant zone */          /* We only scale texture data ! */
1093          if (s->zone_mode == XVID_ZONE_QUANT) {          total_invariant  = rc->tot_invariant[XVID_TYPE_IVOP-1];
1094            total_invariant += rc->tot_invariant[XVID_TYPE_PVOP-1];
1095            total_invariant += rc->tot_invariant[XVID_TYPE_BVOP-1];
1096            /* don't forget to substract header bytes used in quant zones, otherwise we
1097             * counting them twice */
1098            total_invariant -= rc->tot_quant_invariant;
1099    
1100            /* We remove the bytes used by the fixed quantizer zones during first pass
1101             * with the same quants, so we know very precisely how much that
1102             * represents */
1103            target  = rc->target;
1104            target -= rc->tot_quant;
1105    
1106            /* Do the same for the first pass data */
1107            pass1_length  = rc->tot_length[XVID_TYPE_IVOP-1];
1108            pass1_length += rc->tot_length[XVID_TYPE_PVOP-1];
1109            pass1_length += rc->tot_length[XVID_TYPE_BVOP-1];
1110            pass1_length -= rc->tot_quant;
1111    
1112            /* Let's compute a linear scaler in order to perform curve scaling */
1113            scaler = (double)(target - total_invariant) / (double)(pass1_length - total_invariant);
1114    
1115            if ((target - total_invariant) <= 0 ||
1116                    (pass1_length - total_invariant) <= 0 ||
1117                    target >= pass1_length) {
1118                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- WARNING: Undersize detected before correction\n");
1119                    scaler = 1.0;
1120            }
1121    
1122                  rc->fq_error += s->weight;          /* Compute min frame lengths (for each frame type) according to the number
1123                  data->quant = (int)rc->fq_error;           * of MBs. We sum all block type counters of frame 0, this gives us the
1124                  rc->fq_error -= data->quant;           * number of MBs.
1125             *
1126             * We compare these hardcoded values with observed values in first pass
1127             * (determined in pre_process0).Then we keep the real minimum. */
1128    
1129                  s->desired_length = s->length;          /* Number of MBs */
1130            num_MBs  = rc->stats[0].blks[0];
1131            num_MBs += rc->stats[0].blks[1];
1132            num_MBs += rc->stats[0].blks[2];
1133    
1134            /* Minimum for I frames */
1135            if(rc->min_length[XVID_TYPE_IVOP-1] > ((num_MBs*22) + 240) / 8)
1136                    rc->min_length[XVID_TYPE_IVOP-1] = ((num_MBs*22) + 240) / 8;
1137    
1138            /* Minimum for P/S frames */
1139            if(rc->min_length[XVID_TYPE_PVOP-1] > ((num_MBs) + 88)  / 8)
1140                    rc->min_length[XVID_TYPE_PVOP-1] = ((num_MBs) + 88)  / 8;
1141    
1142            /* Minimum for B frames */
1143            if(rc->min_length[XVID_TYPE_BVOP-1] > 8)
1144                    rc->min_length[XVID_TYPE_BVOP-1] = 8;
1145    
1146                  return(0);          /* Perform an initial scale pass.
1147             *
1148             * If a frame size is scaled underneath our hardcoded minimums, then we
1149             * force the frame size to the minimum, and deduct the original & scaled
1150             * frame length from the original and target total lengths */
1151            for (i=0; i<rc->num_frames; i++) {
1152                    twopass_stat_t * s = &rc->stats[i];
1153                    int len;
1154    
1155                    /* No need to scale frame length for which a specific quantizer is
1156                     * specified thanks to zones */
1157                    if (s->zone_mode == XVID_ZONE_QUANT) {
1158                            s->scaled_length = s->length;
1159                            continue;
1160          }          }
1161    
1162          /* Third case: insufficent stats data */                  /* Compute the scaled length -- only non invariant data length is scaled */
1163          if (data->frame_num >= rc->num_frames)                  len = s->invariant + (int)((double)(s->length-s->invariant) * scaler * s->weight / rc->avg_weight);
                 return 0;  
1164    
1165          /*                  /* Compare with the computed minimum */
1166           * The last case is the one every normal minded developer should fear to                  if (len < rc->min_length[s->type-1]) {
1167           * maintain in a project :-)                          /* This is a 'forced size' frame, set its frame size to the
1168           */                           * computed minimum */
1169                            s->scaled_length = rc->min_length[s->type-1];
1170    
1171          /* XXX: why by 8 */                          /* Remove both scaled and original size from their respective
1172          overflow = rc->overflow / 8;                           * total counters, as we prepare a second pass for 'regular'
1173                             * frames */
1174          /*                          target -= s->scaled_length;
1175           * The rc->overflow field represents the overflow in current scene (between two                          pass1_length -= s->length;
1176           * IFrames) so we must not forget to reset it if we are enetring a new scene                  } else {
1177           */                          /* Do nothing for now, we'll scale this later */
1178          if (s->type == XVID_TYPE_IVOP) {                          s->scaled_length = 0;
1179                  overflow = 0;                  }
1180          }          }
1181    
1182          desired = s->scaled_length;          /* The first pass on data substracted all 'forced size' frames from the
1183             * total counters. Now, it's possible to scale the 'regular' frames. */
1184    
1185          dbytes = desired;          /* Scaling factor for 'regular' frames */
1186          if (s->type == XVID_TYPE_IVOP) {          scaler = (double)(target - total_invariant) / (double)(pass1_length - total_invariant);
                 dbytes += desired * rc->param.keyframe_boost / 100;  
         }  
         dbytes /= rc->movie_curve;  
1187    
1188          /*          /* Detect undersizing */
1189           * We are now entering in the hard part of the algo, it was first designed          if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {
1190           * to work with i/pframes only streams, so the way it computes things is                  DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- WARNING: Undersize detected after correction\n");
1191           * adapted to pframes only. However we can use it if we just take care to                  scaler = 1.0;
          * scale the bframes sizes to pframes sizes using the ratio avg_p/avg_p and  
          * then before really using values depending on frame sizes, scaling the  
          * value again with the inverse ratio  
          */  
         if (s->type == XVID_TYPE_BVOP) {  
                 dbytes *= rc->avg_length[XVID_TYPE_PVOP-1] / rc->avg_length[XVID_TYPE_BVOP-1];  
1192          }          }
1193    
1194          /*          /* Do another pass with the new scaler */
1195           * Apply user's choosen Payback method. Payback helps bitrate to follow the          for (i=0; i<rc->num_frames; i++) {
1196           * scaled curve "paying back" past errors in curve previsions.                  twopass_stat_t * s = &rc->stats[i];
          */  
         if (rc->param.payback_method == XVID_PAYBACK_BIAS) {  
                 desired =(int)(rc->curve_comp_error / rc->param.bitrate_payback_delay);  
         }else{  
                 desired = (int)(rc->curve_comp_error * dbytes /  
                                                 rc->avg_length[XVID_TYPE_PVOP-1] / rc->param.bitrate_payback_delay);  
1197    
1198                  if (labs(desired) > fabs(rc->curve_comp_error)) {                  /* Ignore frame with forced frame sizes */
1199                          desired = (int)rc->curve_comp_error;                  if (s->scaled_length == 0)
1200                  }                          s->scaled_length = s->invariant + (int)((double)(s->length-s->invariant) * scaler * s->weight / rc->avg_weight);
1201          }          }
1202    
1203          rc->curve_comp_error -= desired;          /* Job done */
1204            return;
1205    }
1206    
1207          /*  /* Apply all user settings to the scaled curve
1208           * Alt curve treatment is not that hard to understand though the formulas   * This implies:
1209           * seem to be huge. Alt treatment is basically a way to soft/harden the   *   keyframe boosting
1210           * curve flux applying sine/linear/cosine ratios   *   high/low compression */
1211           */  static void
1212    scaled_curve_apply_advanced_parameters(rc_2pass2_t * rc)
1213    {
1214            int i;
1215            int64_t ivop_boost_total;
1216    
1217          /* XXX: warning */          /* Reset the rate controller (per frame type) total byte counters */
1218          curve_temp = 0;          for (i=0; i<3; i++) rc->tot_scaled_length[i] = 0;
1219    
1220          if (rc->param.use_alt_curve) {          /* Compute total bytes for each frame type */
1221                  if (s->type != XVID_TYPE_IVOP)  {          for (i=0; i<rc->num_frames;i++) {
1222                          if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                  twopass_stat_t *s = &rc->stats[i];
1223                                  if (dbytes >= rc->alt_curve_high) {                  rc->tot_scaled_length[s->type-1] += s->scaled_length;
                                         curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev);  
                                 } else {  
                                         switch(rc->param.alt_curve_type) {  
                                         case XVID_CURVE_SINE :  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * sin(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_high_diff)));  
                                                 break;  
                                         case XVID_CURVE_LINEAR :  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) / rc->alt_curve_high_diff);  
                                                 break;  
                                         case XVID_CURVE_COSINE :  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_high_diff))));  
                                         }  
                                 }  
                         } else {  
                                 if (dbytes <= rc->alt_curve_low){  
                                         curve_temp = dbytes;  
                                 } else {  
                                         switch(rc->param.alt_curve_type) {  
                                         case XVID_CURVE_SINE :  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * sin(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_low_diff)));  
                                                 break;  
                                         case XVID_CURVE_LINEAR :  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) / rc->alt_curve_low_diff);  
                                                 break;  
                                         case XVID_CURVE_COSINE :  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual + rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_low_diff))));  
                                         }  
                                 }  
1224                          }                          }
1225    
1226                          /*          /* First we compute the total amount of bits needed, as being described by
1227                           * End of code path for curve_temp, as told earlier, we are now           * the scaled distribution. During this pass over the complete stats data,
1228                           * obliged to scale the value to a bframe one using the inverse           * we see how much bits two user settings will get/give from/to p&b frames:
1229                           * ratio applied earlier           *  - keyframe boosting
1230                           */           *  - keyframe distance penalty */
1231                          if (s->type == XVID_TYPE_BVOP)          rc->KF_idx = 0;
1232                                  curve_temp *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];          ivop_boost_total = 0;
1233            for (i=0; i<rc->num_frames; i++) {
1234                    twopass_stat_t * s = &rc->stats[i];
1235    
1236                          curve_temp = curve_temp * rc->curve_comp_scale + rc->alt_curve_curve_bias_bonus;                  /* Some more work is needed for I frames */
1237                    if (s->type == XVID_TYPE_IVOP) {
1238                            int ivop_boost;
1239    
1240                          desired += ((int)curve_temp);                          /* Accumulate bytes needed for keyframe boosting */
1241                          rc->curve_comp_error += curve_temp - (int)curve_temp;                          ivop_boost = s->scaled_length*rc->param.keyframe_boost/100;
                 } else {  
                         /*  
                          * End of code path for dbytes, as told earlier, we are now  
                          * obliged to scale the value to a bframe one using the inverse  
                          * ratio applied earlier  
                          */  
                         if (s->type == XVID_TYPE_BVOP)  
                                 dbytes *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
1242    
1243                          desired += ((int)dbytes);  #if 0 /* ToDo: decide how to apply kfthresholding */
1244                          rc->curve_comp_error += dbytes - (int)dbytes;  #endif
1245                  }                          /* If the frame size drops under the minimum length, then cap ivop_boost */
1246                            if (ivop_boost + s->scaled_length < rc->min_length[XVID_TYPE_IVOP-1])
1247                                    ivop_boost = rc->min_length[XVID_TYPE_IVOP-1] - s->scaled_length;
1248    
1249          } else if ((rc->param.curve_compression_high + rc->param.curve_compression_low) &&      s->type != XVID_TYPE_IVOP) {                          /* Accumulate the ivop boost */
1250                            ivop_boost_total += ivop_boost;
1251    
1252                  curve_temp = rc->curve_comp_scale;                          /* Don't forget to update the keyframe index */
1253                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                          rc->KF_idx++;
1254                          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);  
1255                  }                  }
1256    
1257                  /*          /* Initialize the IBoost tax ratio for P/S/B frames
1258                   * End of code path for curve_temp, as told earlier, we are now           *
1259                   * obliged to scale the value to a bframe one using the inverse           * This ratio has to be applied to p/b/s frames in order to reserve
1260                   * ratio applied earlier           * additional bits for keyframes (keyframe boosting) or if too much
1261                   */           * keyframe distance is applied, bits retrieved from the keyframes.
1262                  if (s->type == XVID_TYPE_BVOP)           *
1263                          curve_temp *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];           * ie pb_length *= rc->pb_iboost_tax_ratio;
1264             *
1265             *    gives the ideal length of a p/b frame */
1266    
1267                  desired += (int)curve_temp;          /* Compute the total length of p/b/s frames (temporary storage into
1268                  rc->curve_comp_error += curve_temp - (int)curve_temp;           * movie_curve) */
1269          } else {          rc->pb_iboost_tax_ratio  = (double)rc->tot_scaled_length[XVID_TYPE_PVOP-1];
1270                  /*          rc->pb_iboost_tax_ratio += (double)rc->tot_scaled_length[XVID_TYPE_BVOP-1];
1271                   * End of code path for dbytes, as told earlier, we are now  
1272                   * obliged to scale the value to a bframe one using the inverse          /* Compute the ratio described above
1273                   * ratio applied earlier           *     taxed_total = sum(0, n, tax*scaled_length)
1274                   */           * <=> taxed_total = tax.sum(0, n, scaled_length)
1275                  if (s->type == XVID_TYPE_BVOP){           * <=> tax = taxed_total / original_total */
1276                          dbytes *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];          rc->pb_iboost_tax_ratio =
1277                  }                  (rc->pb_iboost_tax_ratio - ivop_boost_total) /
1278                    rc->pb_iboost_tax_ratio;
1279    
1280                  desired += (int)dbytes;          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- IFrame boost tax ratio:%.2f\n",
1281                  rc->curve_comp_error += dbytes - (int)dbytes;                          rc->pb_iboost_tax_ratio);
         }  
1282    
1283            /* Compute the average size of frames per frame type */
1284            for(i=0; i<3; i++) {
1285                    /* Special case for missing type or weird case */
1286                    if (rc->count[i] == 0 || rc->pb_iboost_tax_ratio == 0) {
1287                            rc->avg_length[i] = 1;
1288                    } else {
1289                            rc->avg_length[i] = rc->tot_scaled_length[i];
1290    
1291          /*                          if (i == (XVID_TYPE_IVOP-1)) {
1292           * We can't do bigger frames than first pass, this would be stupid as first                                  /* I Frames total has to be added the boost total */
1293           * pass is quant=2 and that reaching quant=1 is not worth it. We would lose                                  rc->avg_length[i] += ivop_boost_total;
          * many bytes and we would not not gain much quality.  
          */  
         if (desired > s->length) {  
                 rc->curve_comp_error += desired - s->length;  
                 desired = s->length;  
1294          }else{          }else{
1295                  if (desired < rc->min_length[s->type-1]) {                                  /* P/B frames has to taxed */
1296                          if (s->type == XVID_TYPE_IVOP){                                  rc->avg_length[i] *= rc->pb_iboost_tax_ratio;
                                 rc->curve_comp_error -= rc->min_length[XVID_TYPE_IVOP-1] - desired;  
1297                          }                          }
1298                          desired = rc->min_length[s->type-1];  
1299                            /* Finally compute the average frame size */
1300                            rc->avg_length[i] /= (double)rc->count[i];
1301                  }                  }
1302          }          }
1303    
1304          s->desired_length = desired;          /* Assymetric curve compression */
1305            if (rc->param.curve_compression_high || rc->param.curve_compression_low) {
1306                    double symetric_total;
1307          /* if this keyframe is too close to the next, reduce it's byte allotment                  double assymetric_delta_total;
            XXX: why do we do this after setting the desired length  */  
   
         if (s->type == XVID_TYPE_IVOP) {  
                 int KFdistance = rc->keyframe_locations[rc->KF_idx] - rc->keyframe_locations[rc->KF_idx - 1];  
   
                 if (KFdistance < rc->param.kftreshold) {  
1308    
1309                          KFdistance = KFdistance - rc->param.min_key_interval;                  /* Like I frame boosting, assymetric curve compression modifies the total
1310                     * amount of needed bits, we must compute the ratio so we can prescale
1311                     lengths */
1312                    symetric_total = 0;
1313                    assymetric_delta_total = 0;
1314                    for (i=0; i<rc->num_frames; i++) {
1315                            double assymetric_delta;
1316                            double dbytes;
1317                            twopass_stat_t * s = &rc->stats[i];
1318    
1319                          if (KFdistance >= 0) {                          /* I Frames are not concerned by assymetric scaling */
1320                                  int KF_min_size;                          if (s->type == XVID_TYPE_IVOP)
1321                                    continue;
1322    
1323                                  KF_min_size = desired * (100 - rc->param.kfreduction) / 100;                          /* During the real run, we would have to apply the iboost tax */
1324                                  if (KF_min_size < 1)                          dbytes = s->scaled_length * rc->pb_iboost_tax_ratio;
                                         KF_min_size = 1;  
1325    
1326                                  desired = KF_min_size + (desired - KF_min_size) * KFdistance /                          /* Update the symmetric curve compression total */
1327                                          (rc->param.kftreshold - rc->param.min_key_interval);                          symetric_total += dbytes;
1328    
1329                                  if (desired < 1)                          /* Apply assymetric curve compression */
1330                                          desired = 1;                          if (dbytes > rc->avg_length[s->type-1])
1331                          }                                  assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * (double)rc->param.curve_compression_high / 100.0f;
1332                  }                          else
1333          }                                  assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * (double)rc->param.curve_compression_low  / 100.0f;
1334    
1335          overflow = (int)((double)overflow * desired / rc->avg_length[XVID_TYPE_PVOP-1]);                          /* Cap to the minimum frame size if needed */
1336                            if (dbytes + assymetric_delta < rc->min_length[s->type-1])
1337                                    assymetric_delta = rc->min_length[s->type-1] - dbytes;
1338    
1339          /* Reign in overflow with huge frames */                          /* Accumulate after assymetric curve compression */
1340          if (labs(overflow) > labs(rc->overflow)) {                          assymetric_delta_total += assymetric_delta;
                 overflow = rc->overflow;  
1341          }          }
1342    
1343          /* Make sure overflow doesn't run away */                  /* Compute the tax that all p/b frames have to pay in order to respect the
1344          if (overflow > desired * rc->param.max_overflow_improvement / 100) {                   * bit distribution changes that the assymetric compression curve imposes
1345                  desired += (overflow <= desired) ? desired * rc->param.max_overflow_improvement / 100 :                   * We want assymetric_total = sum(0, n-1, tax.scaled_length)
1346                          overflow * rc->param.max_overflow_improvement / 100;                   *      ie assymetric_total = ratio.sum(0, n-1, scaled_length)
1347          } else if (overflow < desired * rc->param.max_overflow_degradation / -100){                   *         ratio = assymetric_total / symmetric_total */
1348                  desired += desired * rc->param.max_overflow_degradation / -100;                  rc->assymetric_tax_ratio = ((double)symetric_total - (double)assymetric_delta_total) / (double)symetric_total;
1349          } else {          } else {
1350                  desired += overflow;                  rc->assymetric_tax_ratio = 1.0f;
1351          }          }
1352    
1353          /* Make sure we are not higher than desired frame size */          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Assymetric tax ratio:%.2f\n", rc->assymetric_tax_ratio);
         if (desired > rc->max_length) {  
                 capped_to_max_framesize = 1;  
                 desired = rc->max_length;  
         }  
1354    
1355          /* Make sure to not scale below the minimum framesize */          /* Last bits that need to be reset */
1356          if (desired < rc->min_length[s->type-1])          rc->overflow = 0;
1357                  desired = rc->min_length[s->type-1];          rc->KFoverflow = 0;
1358            rc->KFoverflow_partial = 0;
1359            rc->KF_idx = 0;
1360            rc->desired_total = 0;
1361            rc->real_total = 0;
1362    
1363            /* Job done */
1364            return;
1365    }
1366    
1367    /*****************************************************************************
1368     * Still more low level stuff (nothing to do with stats treatment)
1369     ****************************************************************************/
1370    
1371    /* This function returns an allocated string containing a complete line read
1372     * from the file starting at the current position */
1373    static char *
1374    readline(FILE *f)
1375    {
1376            char *buffer = NULL;
1377            int buffer_size = 0;
1378            int pos = 0;
1379    
1380          /*          do {
1381           * Don't laugh at this very 'simple' quant<->filesize relationship, it                  int c;
          * proves to be acurate enough for our algorithm  
          */  
         data->quant= (s->quant * s->length) / desired;  
1382    
1383          /* Let's clip the computed quantizer, if needed */                  /* Read a character from the stream */
1384          if (data->quant < 1) {                  c = fgetc(f);
                 data->quant = 1;  
         } else if (data->quant > 31) {  
                 data->quant = 31;  
         } else if (s->type != XVID_TYPE_IVOP) {  
1385    
1386                  /*                  /* Is that EOF or new line ? */
1387                   * The frame quantizer has not been clipped, this appear to be a good                  if(c == EOF || c == '\n')
1388                   * computed quantizer, however past frames give us some info about how                          break;
                  * this quantizer performs against the algo prevision. Let's use this  
                  * prevision to increase the quantizer when we observe a too big  
                  * accumulated error  
                  */  
                 if (s->type== XVID_TYPE_BVOP) {  
                         rc->bquant_error[data->quant] += ((double)(s->quant * s->length) / desired) - data->quant;  
1389    
1390                          if (rc->bquant_error[data->quant] >= 1.0) {                  /* Do we have to update buffer ? */
1391                                  rc->bquant_error[data->quant] -= 1.0;                  if(pos >= buffer_size - 1) {
1392                                  data->quant++;                          buffer_size += BUF_SZ;
1393                            buffer = (char*)realloc(buffer, buffer_size);
1394                            if (buffer == NULL)
1395                                    return(NULL);
1396                          }                          }
                 } else {  
                         rc->pquant_error[data->quant] += ((double)(s->quant * s->length) / desired) - data->quant;  
1397    
1398                          if (rc->pquant_error[data->quant] >= 1.0) {                  buffer[pos] = c;
1399                                  rc->pquant_error[data->quant] -= 1.0;                  pos++;
1400                                  ++data->quant;          } while(1);
                         }  
                 }  
         }  
1401    
1402          /*          /* Read \n or EOF */
1403           * Now we have a computed quant that is in the right quante range, with a          if (buffer == NULL) {
1404           * possible +1 correction due to cumulated error. We can now safely clip                  /* EOF, so we reached the end of the file, return NULL */
1405           * the quantizer again with user's quant ranges. "Safely" means the Rate                  if(feof(f))
1406           * Control could learn more about this quantizer, this knowledge is useful                          return(NULL);
1407           * for future frames even if it this quantizer won't be really used atm,  
1408           * that's why we don't perform this clipping earlier.                  /* Just an empty line with just a newline, allocate a 1 byte buffer to
1409           */                   * store a zero length string */
1410          if (data->quant < data->min_quant[s->type-1]) {                  buffer = (char*)malloc(1);
1411                  data->quant = data->min_quant[s->type-1];                  if(buffer == NULL)
1412          } else if (data->quant > data->max_quant[s->type-1]) {                          return(NULL);
                 data->quant = data->max_quant[s->type-1];  
1413          }          }
1414    
1415          /*          /* Zero terminated string */
1416           * To avoid big quality jumps from frame to frame, we apply a "security"          buffer[pos] = '\0';
          * rule that makes |last_quant - new_quant| <= 2. This rule only applies  
          * to predicted frames (P and B)  
          */  
         if (s->type != XVID_TYPE_IVOP && rc->last_quant[s->type-1] && capped_to_max_framesize == 0) {  
1417    
1418                  if (data->quant > rc->last_quant[s->type-1] + 2) {          return(buffer);
                         data->quant = rc->last_quant[s->type-1] + 2;  
                         DPRINTF(XVID_DEBUG_RC, "p/b-frame quantizer prevented from rising too steeply\n");  
1419                  }                  }
1420                  if (data->quant < rc->last_quant[s->type-1] - 2) {  
1421                          data->quant = rc->last_quant[s->type-1] - 2;  /* This function returns a pointer to the first non space char in the given
1422                          DPRINTF(XVID_DEBUG_RC, "p/b-frame quantizer prevented from falling too steeply\n");   * string */
1423    static char *
1424    skipspaces(char *string)
1425    {
1426            const char spaces[] =
1427                    {
1428                            ' ','\t','\0'
1429                    };
1430            const char *spacechar = spaces;
1431    
1432            if (string == NULL) return(NULL);
1433    
1434            while (*string != '\0') {
1435                    /* Test against space chars */
1436                    while (*spacechar != '\0') {
1437                            if (*string == *spacechar) {
1438                                    string++;
1439                                    spacechar = spaces;
1440                                    break;
1441                  }                  }
1442                            spacechar++;
1443          }          }
1444    
1445          /*                  /* No space char */
1446           * We don't want to pollute the RC history results when our computed quant                  if (*spacechar == '\0') return(string);
          * has been computed from a capped frame size  
          */  
         if (capped_to_max_framesize == 0) {  
                 rc->last_quant[s->type-1] = data->quant;  
1447          }          }
1448    
1449          return 0;          return(string);
1450  }  }
1451    
1452    /* This function returns a boolean that tells if the string is only a
1453     * comment */
1454  static int rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)  static int
1455    iscomment(char *string)
1456  {  {
1457      stat_t * s = &rc->stats[data->frame_num];          const char comments[] =
1458                    {
1459          /* Insufficent stats data */                          '#',';', '%', '\0'
1460      if (data->frame_num >= rc->num_frames)                  };
1461          return 0;          const char *cmtchar = comments;
1462            int iscomment = 0;
1463      rc->quant_count[data->quant]++;  
1464            if (string == NULL) return(1);
1465      if (data->type == XVID_TYPE_IVOP) {  
1466          int kfdiff = (rc->keyframe_locations[rc->KF_idx] -      rc->keyframe_locations[rc->KF_idx - 1]);          string = skipspaces(string);
1467    
1468          rc->overflow += rc->KFoverflow;          while(*cmtchar != '\0') {
1469          rc->KFoverflow = s->desired_length - data->length;                  if(*string == *cmtchar) {
1470                            iscomment = 1;
1471          if (kfdiff > 1) {  // non-consecutive keyframes                          break;
             rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);  
         }else{ // consecutive keyframes  
                         rc->overflow += rc->KFoverflow;  
                         rc->KFoverflow = 0;  
                         rc->KFoverflow_partial = 0;  
1472          }          }
1473          rc->KF_idx++;                  cmtchar++;
     }else{  
         // distribute part of the keyframe overflow  
         rc->overflow += s->desired_length - data->length + rc->KFoverflow_partial;  
         rc->KFoverflow -= rc->KFoverflow_partial;  
1474      }      }
1475    
1476      DPRINTF(XVID_DEBUG_RC, "[%i] quant:%i stats1:%i scaled:%i actual:%i overflow:%i\n",          return(iscomment);
         data->frame_num,  
         data->quant,  
         s->length,  
         s->scaled_length,  
         data->length,  
         rc->overflow);  
   
     return(0);  
1477  }  }
1478    
1479    #if 0
1480    static void
1481  int xvid_plugin_2pass2(void * handle, int opt, void * param1, void * param2)  stats_print(rc_2pass2_t * rc)
 {  
     switch(opt)  
1482      {      {
1483      case XVID_PLG_INFO :          int i;
1484          return 0;          const char frame_type[4] = { 'i', 'p', 'b', 's'};
   
     case XVID_PLG_CREATE :  
         return rc_2pass2_create((xvid_plg_create_t*)param1, param2);  
   
     case XVID_PLG_DESTROY :  
         return rc_2pass2_destroy((rc_2pass2_t*)handle, (xvid_plg_destroy_t*)param1);  
   
     case XVID_PLG_BEFORE :  
         return rc_2pass2_before((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);  
1485    
1486      case XVID_PLG_AFTER :          for (i=0; i<rc->num_frames; i++) {
1487          return rc_2pass2_after((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);                  twopass_stat_t *s = &rc->stats[i];
1488                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- frame:%d type:%c quant:%d stats:%d scaled:%d desired:%d actual:%d overflow(%c):%.2f\n",
1489                                    i, frame_type[s->type-1], -1, s->length, s->scaled_length,
1490                                    s->desired_length, -1, frame_type[s->type-1], -1.0f);
1491      }      }
   
     return XVID_ERR_FAIL;  
1492  }  }
1493    #endif
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