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revision 1.1.2.17, Thu May 29 13:53:17 2003 UTC revision 1.5, Sat Jun 12 13:53:19 2004 UTC
# Line 29  Line 29 
29   *   *
30   *****************************************************************************/   *****************************************************************************/
31    
32    #define BQUANT_PRESCALE
33    #undef COMPENSATE_FORMULA
34    
35    /* forces second pass not to be bigger than first */
36    #undef PASS_SMALLER
37    
38    /* automatically alters overflow controls (strength and improvement/degradation)
39            to fight most common problems without user's knowladge */
40    #define SMART_OVERFLOW_SETTING
41    
42  #include <stdio.h>  #include <stdio.h>
43  #include <math.h>  #include <math.h>
44  #include <limits.h>  #include <limits.h>
# Line 37  Line 47 
47  #include "../image/image.h"  #include "../image/image.h"
48    
49  /*****************************************************************************  /*****************************************************************************
50   * Some constants   * Some default settings
51   ****************************************************************************/   ****************************************************************************/
52    
53  #define DEFAULT_KEYFRAME_BOOST 0  #define DEFAULT_KEYFRAME_BOOST 0
54  #define DEFAULT_PAYBACK_METHOD XVID_PAYBACK_PROP  #define DEFAULT_OVERFLOW_CONTROL_STRENGTH 10
 #define DEFAULT_BITRATE_PAYBACK_DELAY 250  
55  #define DEFAULT_CURVE_COMPRESSION_HIGH 0  #define DEFAULT_CURVE_COMPRESSION_HIGH 0
56  #define DEFAULT_CURVE_COMPRESSION_LOW 0  #define DEFAULT_CURVE_COMPRESSION_LOW 0
57  #define DEFAULT_MAX_OVERFLOW_IMPROVEMENT 60  #define DEFAULT_MAX_OVERFLOW_IMPROVEMENT 10
58  #define DEFAULT_MAX_OVERFLOW_DEGRADATION 60  #define DEFAULT_MAX_OVERFLOW_DEGRADATION 10
59    
60  /* Keyframe settings */  /* Keyframe settings */
 #define DEFAULT_KFTRESHOLD 10  
61  #define DEFAULT_KFREDUCTION 20  #define DEFAULT_KFREDUCTION 20
62  #define DEFAULT_MIN_KEY_INTERVAL 1  #define DEFAULT_KFTHRESHOLD 1
63    
64    /*****************************************************************************
65     * Some default constants (can be tuned)
66     ****************************************************************************/
67    
68    /* Specify the invariant part of the headers bits (header+MV)
69     * as  hlength/cst */
70    #define INVARIANT_HEADER_PART_IVOP 1 /* factor 1.0f   */
71    #define INVARIANT_HEADER_PART_PVOP 2 /* factor 0.5f   */
72    #define INVARIANT_HEADER_PART_BVOP 8 /* factor 0.125f */
73    
74  /*****************************************************************************  /*****************************************************************************
75   * Structures   * Structures
# Line 63  Line 81 
81      int quant;              /* first pass quant */      int quant;              /* first pass quant */
82          int blks[3];                    /* k,m,y blks */          int blks[3];                    /* k,m,y blks */
83      int length;             /* first pass length */      int length;             /* first pass length */
84            int invariant;          /* what we assume as being invariant between the two passes, it's a sub part of header + MV bits */
85      int scaled_length;      /* scaled length */      int scaled_length;      /* scaled length */
86      int desired_length;     /* desired length; calcuated during encoding */          int desired_length;     /* desired length; calculated during encoding */
87            int error;
88    
89      int zone_mode;   /* XVID_ZONE_xxx */      int zone_mode;   /* XVID_ZONE_xxx */
90      double weight;      double weight;
91  } stat_t;  } twopass_stat_t;
92    
93  /* Context struct */  /* Context struct */
94  typedef struct  typedef struct
95  {  {
96      xvid_plugin_2pass2_t param;      xvid_plugin_2pass2_t param;
97    
98      /* constant statistical data */          /*----------------------------------
99          int num_frames;           * constant statistical data
100          int num_keyframes;           *--------------------------------*/
         uint64_t target;        /* target filesize */  
   
         int count[3];   /* count of each frame types */  
         uint64_t tot_length[3];  /* total length of each frame types */  
         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 */  
101    
102          /* zone statistical data */          /* Number of frames of the sequence */
103          double avg_weight;  /* average weight */          int num_frames;
         int64_t tot_quant;   /* total length used by XVID_ZONE_QUANT zones */  
104    
105            /* Number of Intra frames of the sequence */
106            int num_keyframes;
107    
108          double curve_comp_scale;          /* Target filesize to reach */
109          double movie_curve;          uint64_t target;
110    
111          /* dynamic */          /* Count of each frame types */
112            int count[3];
113    
114            /* Total length of each frame types (1st pass) */
115            uint64_t tot_length[3];
116            uint64_t tot_invariant[3];
117    
118            /* Average length of each frame types (used first for 1st pass data and
119             * then for scaled averages */
120            double avg_length[3];
121    
122            /* Minimum frame length allowed for each frame type */
123            int min_length[3];
124    
125            /* Total bytes per frame type once the curve has been scaled
126             * NB: advanced parameters do not change this value. This field
127             *     represents the total scaled w/o any advanced settings */
128            uint64_t tot_scaled_length[3];
129    
130            /* Maximum observed frame size observed during the first pass, the RC
131             * will try tp force all frame sizes in the second pass to be under that
132             * limit */
133            int max_length;
134    
135            /*----------------------------------
136             * Zones statistical data
137             *--------------------------------*/
138    
139            /* Total length used by XVID_ZONE_QUANT zones */
140            uint64_t tot_quant;
141            uint64_t tot_quant_invariant;
142    
143            /* Holds the total amount of frame bytes, zone weighted (only scalable
144             * part of frame bytes) */
145            uint64_t tot_weighted;
146    
147            /*----------------------------------
148             * Advanced settings helper ratios
149             *--------------------------------*/
150    
151            /* This the ratio that has to be applied to all p/b frames in order
152             * to reserve/retrieve bits for/from keyframe boosting and consecutive
153             * keyframe penalty */
154            double pb_iboost_tax_ratio;
155    
156            /* This the ratio to apply to all b/p frames in order to respect the
157             * assymetric curve compression while respecting a target filesize
158             * NB: The assymetric delta gain has to be computed before this ratio
159             *     is applied, and then the delta is added to the scaled size */
160            double assymetric_tax_ratio;
161    
162            /*----------------------------------
163             * Data from the stats file kept
164             * into RAM for easy access
165             *--------------------------------*/
166    
167            /* Array of keyframe locations
168             * eg: rc->keyframe_locations[100] returns the frame number of the 100th
169             *     keyframe */
170          int * keyframe_locations;          int * keyframe_locations;
         stat_t * stats;  
171    
172            /* Index of the last keyframe used in the keyframe_location */
173            int KF_idx;
174    
175            /* Array of all 1st pass data file -- see the twopass_stat_t structure
176             * definition for more details */
177            twopass_stat_t * stats;
178    
179            /*----------------------------------
180             * Hysteresis helpers
181             *--------------------------------*/
182    
183            /* This field holds the int2float conversion errors of each quant per
184             * frame type, this allow the RC to keep track of rouding error and thus
185             * increase or decrease the chosen quant according to this residue */
186          double quant_error[3][32];          double quant_error[3][32];
187          int quant_count[32];  
188            /* This fields stores the count of each quant usage per frame type
189             * No real role but for debugging */
190            int quant_count[3][32];
191    
192            /* Last valid quantizer used per frame type, it allows quantizer
193             * increament/decreament limitation in order to avoid big image quality
194             * "jumps" */
195          int last_quant[3];          int last_quant[3];
196    
197          double curve_comp_error;          /*----------------------------------
198          int overflow;           * Overflow control
199          int KFoverflow;           *--------------------------------*/
200          int KFoverflow_partial;  
201          int KF_idx;          /* Current overflow that has to be distributed to p/b frames */
202            double overflow;
203    
204            /* Total overflow for keyframes -- not distributed directly */
205            double KFoverflow;
206    
207            /* Amount of keyframe overflow to introduce to the global p/b frame
208             * overflow counter at each encoded frame */
209            double KFoverflow_partial;
210    
211            /* Unknown ???
212             * ToDo: description */
213          double fq_error;          double fq_error;
214    
215            int min_quant; /* internal minimal quant, prevents wrong quants from being used */
216    
217            /*----------------------------------
218             * Debug
219             *--------------------------------*/
220            double desired_total;
221            double real_total;
222  } rc_2pass2_t;  } rc_2pass2_t;
223    
224    
# Line 132  Line 240 
240  {  {
241      switch(opt) {      switch(opt) {
242      case XVID_PLG_INFO :      case XVID_PLG_INFO :
243            case XVID_PLG_FRAME :
244          return 0;          return 0;
245    
246      case XVID_PLG_CREATE :      case XVID_PLG_CREATE :
# Line 155  Line 264 
264   ****************************************************************************/   ****************************************************************************/
265    
266  /* First a few local helping function prototypes */  /* First a few local helping function prototypes */
267  static  int det_stats_length(rc_2pass2_t * rc, char * filename);  static  int statsfile_count_frames(rc_2pass2_t * rc, char * filename);
268  static  int load_stats(rc_2pass2_t *rc, char * filename);  static  int statsfile_load(rc_2pass2_t *rc, char * filename);
269  static void zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create);  static void zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create);
270  static void internal_scale(rc_2pass2_t *rc);  static void first_pass_stats_prepare_data(rc_2pass2_t * rc);
271  static void pre_process0(rc_2pass2_t * rc);  static void first_pass_scale_curve_internal(rc_2pass2_t *rc);
272  static void pre_process1(rc_2pass2_t * rc);  static void scaled_curve_apply_advanced_parameters(rc_2pass2_t * rc);
273    static  int check_curve_for_vbv_compliancy(rc_2pass2_t * rc, const float fps);
274    static  int scale_curve_for_vbv_compliancy(rc_2pass2_t * rc, const float fps);
275    #if 0
276    static void stats_print(rc_2pass2_t * rc);
277    #endif
278    
279  /*----------------------------------------------------------------------------  /*----------------------------------------------------------------------------
280   *--------------------------------------------------------------------------*/   *--------------------------------------------------------------------------*/
# Line 176  Line 290 
290      if (rc == NULL)      if (rc == NULL)
291          return XVID_ERR_MEMORY;          return XVID_ERR_MEMORY;
292    
293      rc->param = *param;          /* v1.0.x */
294            rc->param.version = param->version;
295            rc->param.bitrate = param->bitrate;
296            rc->param.filename = param->filename;
297            rc->param.keyframe_boost = param->keyframe_boost;
298            rc->param.curve_compression_high = param->curve_compression_high;
299            rc->param.curve_compression_low = param->curve_compression_low;
300            rc->param.overflow_control_strength = param->overflow_control_strength;
301            rc->param.max_overflow_improvement = param->max_overflow_improvement;
302            rc->param.max_overflow_degradation = param->max_overflow_degradation;
303            rc->param.kfreduction = param->kfreduction;
304            rc->param.kfthreshold = param->kfthreshold;
305            rc->param.container_frame_overhead = param->container_frame_overhead;
306    
307            if (XVID_VERSION_MINOR(param->version) >= 1) {
308                    rc->param.vbv_size = param->vbv_size;
309                    rc->param.vbv_initial = param->vbv_initial;
310                    rc->param.vbv_maxrate = param->vbv_maxrate;
311                    rc->param.vbv_peakrate = param->vbv_peakrate;
312            }else{
313                    rc->param.vbv_size =
314                    rc->param.vbv_initial =
315                    rc->param.vbv_maxrate =
316                    rc->param.vbv_peakrate = 0;
317            }
318    
319          /*          /* Initialize all defaults */
          * Initialize all defaults  
          */  
320  #define _INIT(a, b) if((a) <= 0) (a) = (b)  #define _INIT(a, b) if((a) <= 0) (a) = (b)
321      /* Let's set our defaults if needed */      /* Let's set our defaults if needed */
322          _INIT(rc->param.keyframe_boost, DEFAULT_KEYFRAME_BOOST);          _INIT(rc->param.keyframe_boost, DEFAULT_KEYFRAME_BOOST);
323          _INIT(rc->param.payback_method, DEFAULT_PAYBACK_METHOD);          _INIT(rc->param.overflow_control_strength, DEFAULT_OVERFLOW_CONTROL_STRENGTH);
         _INIT(rc->param.bitrate_payback_delay, DEFAULT_BITRATE_PAYBACK_DELAY);  
324      _INIT(rc->param.curve_compression_high, DEFAULT_CURVE_COMPRESSION_HIGH);      _INIT(rc->param.curve_compression_high, DEFAULT_CURVE_COMPRESSION_HIGH);
325      _INIT(rc->param.curve_compression_low, DEFAULT_CURVE_COMPRESSION_LOW);      _INIT(rc->param.curve_compression_low, DEFAULT_CURVE_COMPRESSION_LOW);
326      _INIT(rc->param.max_overflow_improvement, DEFAULT_MAX_OVERFLOW_IMPROVEMENT);      _INIT(rc->param.max_overflow_improvement, DEFAULT_MAX_OVERFLOW_IMPROVEMENT);
327      _INIT(rc->param.max_overflow_degradation,  DEFAULT_MAX_OVERFLOW_DEGRADATION);      _INIT(rc->param.max_overflow_degradation,  DEFAULT_MAX_OVERFLOW_DEGRADATION);
328    
329      /* Keyframe settings */      /* Keyframe settings */
         _INIT(rc->param.kftreshold, DEFAULT_KFTRESHOLD);  
330      _INIT(rc->param.kfreduction, DEFAULT_KFREDUCTION);      _INIT(rc->param.kfreduction, DEFAULT_KFREDUCTION);
331      _INIT(rc->param.min_key_interval, DEFAULT_MIN_KEY_INTERVAL);          _INIT(rc->param.kfthreshold, DEFAULT_KFTHRESHOLD);
332  #undef _INIT  #undef _INIT
333    
334          /* Initialize some stuff to zero */          /* Initialize some stuff to zero */
         for(i=0; i<32; i++) rc->quant_count[i] = 0;  
   
335          for(i=0; i<3; i++) {          for(i=0; i<3; i++) {
336                  int j;                  int j;
337                  for (j=0; j<32; j++)                  for (j=0; j<32; j++) {
338                          rc->quant_error[i][j] = 0;                          rc->quant_error[i][j] = 0;
339                            rc->quant_count[i][j] = 0;
340                    }
341          }          }
342    
343          for (i=0; i<3; i++)          for (i=0; i<3; i++) rc->last_quant[i] = 0;
                 rc->last_quant[i] = 0;  
344    
345          rc->fq_error = 0;          rc->fq_error = 0;
346            rc->min_quant = 1;
347    
348          /* Count frames in the stats file */          /* Count frames (and intra frames) in the stats file, store the result into
349          if (!det_stats_length(rc, param->filename)) {           * the rc structure */
350                  DPRINTF(XVID_DEBUG_RC,"ERROR: fopen %s failed\n", param->filename);          if (statsfile_count_frames(rc, param->filename) == -1) {
351                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- ERROR: fopen %s failed\n", param->filename);
352                  free(rc);                  free(rc);
353                  return XVID_ERR_FAIL;                  return(XVID_ERR_FAIL);
354          }          }
355    
356      /* Allocate the stats' memory */      /* Allocate the stats' memory */
357          if ((rc->stats = malloc(rc->num_frames * sizeof(stat_t))) == NULL) {          if ((rc->stats = malloc(rc->num_frames * sizeof(twopass_stat_t))) == NULL) {
358          free(rc);          free(rc);
359          return XVID_ERR_MEMORY;                  return(XVID_ERR_MEMORY);
360      }      }
361    
362      /*          /* Allocate keyframes location's memory
363           * Allocate keyframes location's memory           * PS: see comment in pre_process0 for the +1 location requirement */
          * PS: see comment in pre_process0 for the +1 location requirement  
          */  
364          rc->keyframe_locations = malloc((rc->num_keyframes + 1) * sizeof(int));          rc->keyframe_locations = malloc((rc->num_keyframes + 1) * sizeof(int));
365          if (rc->keyframe_locations == NULL) {          if (rc->keyframe_locations == NULL) {
366                  free(rc->stats);                  free(rc->stats);
367                  free(rc);                  free(rc);
368                  return XVID_ERR_MEMORY;                  return(XVID_ERR_MEMORY);
369          }          }
370    
371          if (!load_stats(rc, param->filename)) {          /* Load the first pass stats */
372                  DPRINTF(XVID_DEBUG_RC,"ERROR: fopen %s failed\n", param->filename);          if (statsfile_load(rc, param->filename) == -1) {
373                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- ERROR: fopen %s failed\n", param->filename);
374                  free(rc->keyframe_locations);                  free(rc->keyframe_locations);
375                  free(rc->stats);                  free(rc->stats);
376                  free(rc);                  free(rc);
# Line 244  Line 378 
378          }          }
379    
380          /* Compute the target filesize */          /* Compute the target filesize */
381          if (rc->num_frames  < create->fbase/create->fincr) {          if (rc->param.bitrate<0) {
382                    /* if negative, bitrate equals the target (in kbytes) */
383                    rc->target = ((uint64_t)(-rc->param.bitrate)) * 1024;
384            } else if (rc->num_frames  < create->fbase/create->fincr) {
385                  /* Source sequence is less than 1s long, we do as if it was 1s long */                  /* Source sequence is less than 1s long, we do as if it was 1s long */
386                  rc->target = rc->param.bitrate / 8;                  rc->target = rc->param.bitrate / 8;
387          } else {          } else {
# Line 255  Line 392 
392                          ((uint64_t)create->fbase * 8);                          ((uint64_t)create->fbase * 8);
393          }          }
394    
395          DPRINTF(XVID_DEBUG_RC, "Frame rate: %d/%d (%ffps)\n",          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Frame rate: %d/%d (%ffps)\n",
396                          create->fbase, create->fincr,                          create->fbase, create->fincr,
397                          (double)create->fbase/(double)create->fincr);                          (double)create->fbase/(double)create->fincr);
398          DPRINTF(XVID_DEBUG_RC, "Number of frames: %d\n", rc->num_frames);          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Number of frames: %d\n", rc->num_frames);
399          DPRINTF(XVID_DEBUG_RC, "Target bitrate: %ld\n", rc->param.bitrate);          if(rc->param.bitrate>=0)
400          DPRINTF(XVID_DEBUG_RC, "Target filesize: %lld\n", rc->target);                  DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Target bitrate: %ld\n", rc->param.bitrate);
401            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Target filesize: %lld\n", rc->target);
402    
403          /* Compensate the average frame overhead caused by the container */          /* Compensate the average frame overhead caused by the container */
404          rc->target -= rc->num_frames*rc->param.container_frame_overhead;          rc->target -= rc->num_frames*rc->param.container_frame_overhead;
405          DPRINTF(XVID_DEBUG_RC, "Container Frame overhead: %d\n", rc->param.container_frame_overhead);          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Container Frame overhead: %d\n", rc->param.container_frame_overhead);
406          DPRINTF(XVID_DEBUG_RC, "Target filesize (after container compensation): %lld\n", rc->target);          if(rc->param.container_frame_overhead)
407                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- New target filesize after container compensation: %lld\n", rc->target);
408    
409          /*          /* When bitrate is not given it means it has been scaled by an external
410           * First data pre processing:           * application */
411            if (rc->param.bitrate) {
412                    /* Apply zone settings
413                     * - set rc->tot_quant which represents the total num of bytes spent in
414                     *   fixed quant zones
415                     * - set rc->tot_weighted which represents the total amount of bytes
416                     *   spent in normal or weighted zones in first pass (normal zones can
417                     *   be considered weight=1)
418                     * - set rc->tot_quant_invariant which represents the total num of bytes
419                     *   spent in fixed quant zones for headers */
420                    zone_process(rc, create);
421            } else {
422                    /* External scaling -- zones are ignored */
423                    for (i=0;i<rc->num_frames;i++) {
424                            rc->stats[i].zone_mode = XVID_ZONE_WEIGHT;
425                            rc->stats[i].weight = 1.0;
426                    }
427                    rc->tot_quant = 0;
428            }
429    
430            /* Gathers some information about first pass stats:
431           *  - finds the minimum frame length for each frame type during 1st pass.           *  - finds the minimum frame length for each frame type during 1st pass.
432           *     rc->min_size[]           *     rc->min_size[]
433           *  - determines the maximum frame length observed (no frame type distinction).           *  - determines the maximum frame length observed (no frame type distinction).
# Line 276  Line 435 
435           *  - count how many times each frame type has been used.           *  - count how many times each frame type has been used.
436           *     rc->count[]           *     rc->count[]
437           *  - total bytes used per frame type           *  - total bytes used per frame type
438           *     rc->total[]           *     rc->tot_length[]
439             *  - total bytes considered invariant between the 2 passes
440           *  - store keyframe location           *  - store keyframe location
441           *     rc->keyframe_locations[]           *     rc->keyframe_locations[]
442           */           */
443          pre_process0(rc);          first_pass_stats_prepare_data(rc);
444    
445          /*          /* If we have a user bitrate, it means it's an internal curve scaling */
          * When bitrate is not given it means it has been scaled by an external  
          * application  
          */  
446          if (rc->param.bitrate) {          if (rc->param.bitrate) {
447                  /* Apply zone settings */                  /* Perform internal curve scaling */
448                  zone_process(rc, create);                  first_pass_scale_curve_internal(rc);
                 /* Perform curve scaling */  
                 internal_scale(rc);  
         } else {  
                 /* External scaling -- zones are ignored */  
                 for (i=0;i<rc->num_frames;i++) {  
                         rc->stats[i].zone_mode = XVID_ZONE_WEIGHT;  
                         rc->stats[i].weight = 1.0;  
449                  }                  }
450                  rc->avg_weight = 1.0;  
451                  rc->tot_quant = 0;          /* Apply advanced curve options, and compute some parameters in order to
452             * shape the curve in the BEFORE/AFTER pair of functions */
453            scaled_curve_apply_advanced_parameters(rc);
454    
455            /* Check curve for VBV compliancy and rescale if necessary */
456    #ifdef VBV_FORCE
457            if (rc->param.vbv_size==0) {
458                    rc->param.vbv_size      =  3145728;
459                    rc->param.vbv_initial   =  2359296;
460                    rc->param.vbv_maxrate  =  4000000;
461                    rc->param.vbv_peakrate = 10000000;
462            }
463    #endif
464    
465            /* vbv_size==0 switches VBV check off */
466            if (rc->param.vbv_size > 0)  {
467                    const double fps = (double)create->fbase/(double)create->fincr;
468                    int status = check_curve_for_vbv_compliancy(rc, fps);
469    
470                    if (status) {
471                            DPRINTF(XVID_DEBUG_RC, "[xvid rc] Underflow detected - Scaling Curve for compliancy.\n");
472          }          }
473    
474          pre_process1(rc);                  status = scale_curve_for_vbv_compliancy(rc, fps);
475    
476                    if (status == 0) {
477                            DPRINTF(XVID_DEBUG_RC, "[xvid rc] VBV compliant curve scaling done.\n");
478                    } else {
479                            DPRINTF(XVID_DEBUG_RC, "[xvid rc] VBV compliant curve scaling impossible.\n");
480                    }
481            }
482          *handle = rc;          *handle = rc;
483          return(0);          return(0);
484  }  }
# Line 313  Line 489 
489  static int  static int
490  rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy)  rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy)
491  {  {
492            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- target_total:%lld desired_total:%.2f (%.2f%%) actual_total:%.2f (%.2f%%)\n",
493                            rc->target,
494                            rc->desired_total,
495                            100*rc->desired_total/(double)rc->target,
496                            rc->real_total,
497                            100*rc->real_total/(double)rc->target);
498    
499      free(rc->keyframe_locations);      free(rc->keyframe_locations);
500      free(rc->stats);      free(rc->stats);
501          free(rc);          free(rc);
# Line 325  Line 508 
508  static int  static int
509  rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)  rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)
510  {  {
511          stat_t * s = &rc->stats[data->frame_num];          twopass_stat_t * s = &rc->stats[data->frame_num];
         int overflow;  
         int desired;  
512          double dbytes;          double dbytes;
         double curve_temp;  
513          double scaled_quant;          double scaled_quant;
514            double overflow;
515          int capped_to_max_framesize = 0;          int capped_to_max_framesize = 0;
516    
517          /*          /* This function is quite long but easy to understand. In order to simplify
518           * 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. */
          * the code path (a bit), we treat 3 cases that can return immediatly.  
          */  
519    
520          /* First case: Another plugin has already set a quantizer */          /* First case: Another plugin has already set a quantizer */
521      if (data->quant > 0)      if (data->quant > 0)
522                  return(0);                  return(0);
523    
524          /* Second case: We are in a Quant zone */          /* Second case: insufficent stats data
525             * We can't guess much what we should do, let core decide all alone */
526            if (data->frame_num >= rc->num_frames) {
527                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- stats file too short (now processing frame %d)",
528                            data->frame_num);
529                    return(0);
530            }
531    
532            /* Third case: We are in a Quant zone
533             * Quant zones must just ensure we use the same settings as first pass
534             * So set the quantizer and the type */
535          if (s->zone_mode == XVID_ZONE_QUANT) {          if (s->zone_mode == XVID_ZONE_QUANT) {
536                    /* Quant stuff */
537                  rc->fq_error += s->weight;                  rc->fq_error += s->weight;
538                  data->quant = (int)rc->fq_error;                  data->quant = (int)rc->fq_error;
539                  rc->fq_error -= data->quant;                  rc->fq_error -= data->quant;
540    
541                    /* The type stuff */
542                    data->type = s->type;
543    
544                    /* The only required data for AFTER step is this one for the overflow
545                     * control */
546                  s->desired_length = s->length;                  s->desired_length = s->length;
547    
548                  return(0);                  return(0);
549          }          }
550    
         /* Third case: insufficent stats data */  
         if (data->frame_num >= rc->num_frames)  
                 return 0;  
   
         /*  
          * The last case is the one every normal minded developer should fear to  
          * maintain in a project :-)  
          */  
   
         /* XXX: why by 8 */  
         overflow = rc->overflow / 8;  
551    
552          /*          /*************************************************************************/
553           * The rc->overflow field represents the overflow in current scene (between two          /*************************************************************************/
554           * IFrames) so we must not forget to reset it if we are entering a new scene          /*************************************************************************/
          */  
         if (s->type == XVID_TYPE_IVOP)  
                 overflow = 0;  
555    
556          desired = s->scaled_length;          /*-------------------------------------------------------------------------
557             * Frame bit allocation first part
558             *
559             * First steps apply user settings, just like it is done in the theoritical
560             * scaled_curve_apply_advanced_parameters
561             *-----------------------------------------------------------------------*/
562    
563          dbytes = desired;          /* Set desired to what we are wanting to obtain for this frame */
564          if (s->type == XVID_TYPE_IVOP)          dbytes = (double)s->scaled_length;
                 dbytes += desired * rc->param.keyframe_boost / 100;  
         dbytes /= rc->movie_curve;  
565    
566          /*          /* IFrame user settings*/
567           * We are now entering in the hard part of the algo, it was first designed          if (s->type == XVID_TYPE_IVOP) {
568           * to work with i/pframes only streams, so the way it computes things is                  /* Keyframe boosting -- All keyframes benefit from it */
569           * adapted to pframes only. However we can use it if we just take care to                  dbytes += dbytes*rc->param.keyframe_boost / 100;
          * 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];  
570    
571          /*  #if 0 /* ToDo: decide how to apply kfthresholding */
572           * Apply user's choosen Payback method. Payback helps bitrate to follow the  #endif
          * scaled curve "paying back" past errors in curve previsions.  
          */  
         if (rc->param.payback_method == XVID_PAYBACK_BIAS) {  
                 desired = (int)(rc->curve_comp_error / rc->param.bitrate_payback_delay);  
573          } else {          } else {
                 desired = (int)(rc->curve_comp_error * dbytes /  
                                                 rc->avg_length[XVID_TYPE_PVOP-1] / rc->param.bitrate_payback_delay);  
574    
575                  if (labs(desired) > fabs(rc->curve_comp_error)) {                  /* P/S/B frames must reserve some bits for iframe boosting */
576                          desired = (int)rc->curve_comp_error;                  dbytes *= rc->pb_iboost_tax_ratio;
577    
578                    /* Apply assymetric curve compression */
579                    if (rc->param.curve_compression_high || rc->param.curve_compression_low) {
580                            double assymetric_delta;
581    
582                            /* Compute the assymetric delta, this is computed before applying
583                             * the tax, as done in the pre_process function */
584                            if (dbytes > rc->avg_length[s->type-1])
585                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_high / 100.0;
586                            else
587                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_low  / 100.0;
588    
589                            /* Now we must apply the assymetric tax, else our curve compression
590                             * would not give a theoritical target size equal to what it is
591                             * expected */
592                            dbytes *= rc->assymetric_tax_ratio;
593    
594                            /* Now we can add the assymetric delta */
595                            dbytes += assymetric_delta;
596                  }                  }
597          }          }
598    
599          rc->curve_comp_error -= desired;          /* That is what we would like to have -- Don't put that chunk after
600             * overflow control, otherwise, overflow is counted twice and you obtain
601             * half sized bitrate sequences */
602            s->desired_length  = (int)dbytes;
603            rc->desired_total += dbytes;
604    
605          /* XXX: warning */          /*------------------------------------------------------------------------
606          curve_temp = 0;           * Frame bit allocation: overflow control part.
607             *
608             * Unlike the theoritical scaled_curve_apply_advanced_parameters, here
609             * it's real encoding and we need to make sure we don't go so far from
610             * what is our ideal scaled curve.
611             *-----------------------------------------------------------------------*/
612    
613            /* Compute the overflow we should compensate */
614            if (s->type != XVID_TYPE_IVOP || rc->overflow > 0) {
615                    double frametype_factor;
616                    double framesize_factor;
617    
618          if ((rc->param.curve_compression_high + rc->param.curve_compression_low) &&     s->type != XVID_TYPE_IVOP) {                  /* Take only the desired part of overflow */
619                    overflow = rc->overflow;
620    
621                  curve_temp = rc->curve_comp_scale;                  /* Factor that will take care to decrease the overflow applied
622                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                   * according to the importance of this frame type in term of
623                          curve_temp *= ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_high / 100.0);                   * overall size */
624                  } else {                  frametype_factor  = rc->count[XVID_TYPE_IVOP-1]*rc->avg_length[XVID_TYPE_IVOP-1];
625                          curve_temp *= ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_low / 100.0);                  frametype_factor += rc->count[XVID_TYPE_PVOP-1]*rc->avg_length[XVID_TYPE_PVOP-1];
626                  }                  frametype_factor += rc->count[XVID_TYPE_BVOP-1]*rc->avg_length[XVID_TYPE_BVOP-1];
627                    frametype_factor /= rc->count[s->type-1]*rc->avg_length[s->type-1];
628                    frametype_factor  = 1/frametype_factor;
629    
630                    /* Factor that will take care not to compensate too much for this frame
631                     * size */
632                    framesize_factor  = dbytes;
633                    framesize_factor /= rc->avg_length[s->type-1];
634    
635                  /*                  /* Treat only the overflow part concerned by this frame type and size */
636                   * End of code path for curve_temp, as told earlier, we are now                  overflow *= frametype_factor;
637                   * obliged to scale the value to a bframe one using the inverse  #if 0
638                   * ratio applied earlier                  /* Leave this one alone, as it impacts badly on quality */
639                   */                  overflow *= framesize_factor;
640                  if (s->type == XVID_TYPE_BVOP)  #endif
                         curve_temp *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
641    
642                  desired += (int)curve_temp;                  /* Apply the overflow strength imposed by the user */
643                  rc->curve_comp_error += curve_temp - (int)curve_temp;                  overflow *= (rc->param.overflow_control_strength/100.0f);
644          } else {          } else {
645                  /*                  /* no negative overflow applied in IFrames because:
646                   * End of code path for dbytes, as told earlier, we are now                   *  - their role is important as they're references for P/BFrames.
647                   * obliged to scale the value to a bframe one using the inverse                   *  - there aren't much in typical sequences, so if an IFrame overflows too
648                   * ratio applied earlier                   *    much, this overflow may impact the next IFrame too much and generate
649                   */                   *    a sequence of poor quality frames */
650                  if (s->type == XVID_TYPE_BVOP)                  overflow = 0;
                         dbytes *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
   
                 desired += (int)dbytes;  
                 rc->curve_comp_error += dbytes - (int)dbytes;  
651          }          }
652    
653            /* Make sure we are not trying to compensate more overflow than we even have */
654            if (fabs(overflow) > fabs(rc->overflow))
655                    overflow = rc->overflow;
656    
657          /*          /* Make sure the overflow doesn't make the frame size to get out of the range
658           * We can't do bigger frames than first pass, this would be stupid as first           * [-max_degradation..+max_improvment] */
659           * pass is quant=2 and that reaching quant=1 is not worth it. We would lose          if (overflow > dbytes*rc->param.max_overflow_improvement / 100) {
660           * many bytes and we would not not gain much quality.                  if(overflow <= dbytes)
661           */                          dbytes += dbytes * rc->param.max_overflow_improvement / 100;
662          if (desired > s->length) {                  else
663                  rc->curve_comp_error += desired - s->length;                          dbytes += overflow * rc->param.max_overflow_improvement / 100;
664                  desired = s->length;          } else if (overflow < - dbytes * rc->param.max_overflow_degradation / 100) {
665                    dbytes -= dbytes * rc->param.max_overflow_degradation / 100;
666          } else {          } else {
667                  if (desired < rc->min_length[s->type-1]) {                  dbytes += overflow;
                         if (s->type == XVID_TYPE_IVOP){  
                                 rc->curve_comp_error -= rc->min_length[XVID_TYPE_IVOP-1] - desired;  
668                          }                          }
                         desired = rc->min_length[s->type-1];  
                 }  
         }  
   
         s->desired_length = desired;  
   
   
         /*  
          * if this keyframe is too close to the next, reduce it's byte allotment  
          * XXX: why do we do this after setting the desired length ?  
          */  
669    
670          if (s->type == XVID_TYPE_IVOP) {          /*-------------------------------------------------------------------------
671                  int KFdistance = rc->keyframe_locations[rc->KF_idx] - rc->keyframe_locations[rc->KF_idx - 1];           * Frame bit allocation last part:
672             *
673                  if (KFdistance < rc->param.kftreshold) {           * Cap frame length so we don't reach neither bigger frame sizes than first
674             * pass nor smaller than the allowed minimum.
675             *-----------------------------------------------------------------------*/
676    
677    #ifdef PASS_SMALLER
678            if (dbytes > s->length) {
679                    dbytes = s->length;
680            }
681    #endif
682    
683                          KFdistance -= rc->param.min_key_interval;          /* Prevent stupid desired sizes under logical values */
684            if (dbytes < rc->min_length[s->type-1]) {
685                    dbytes = rc->min_length[s->type-1];
686            }
687    
688                          if (KFdistance >= 0) {          /*------------------------------------------------------------------------
689                                  int KF_min_size;           * Desired frame length <-> quantizer mapping
690             *-----------------------------------------------------------------------*/
691    
692                                  KF_min_size = desired * (100 - rc->param.kfreduction) / 100;  #ifdef BQUANT_PRESCALE
693                                  if (KF_min_size < 1)          /* For bframes we prescale the quantizer to avoid too high quant scaling */
694                                          KF_min_size = 1;          if(s->type == XVID_TYPE_BVOP) {
695    
696                                  desired = KF_min_size + (desired - KF_min_size) * KFdistance /                  twopass_stat_t *b_ref = s;
                                         (rc->param.kftreshold - rc->param.min_key_interval);  
697    
698                                  if (desired < 1)                  /* Find the reference frame */
699                                          desired = 1;                  while(b_ref != &rc->stats[0] && b_ref->type == XVID_TYPE_BVOP)
700                          }                          b_ref--;
701                  }  
702                    /* Compute the original quant */
703                    s->quant  = 2*(100*s->quant - data->bquant_offset);
704                    s->quant += data->bquant_ratio - 1; /* to avoid rounding issues */
705                    s->quant  = s->quant/data->bquant_ratio - b_ref->quant;
706          }          }
707    #endif
708    
709          overflow = (int)((double)overflow * desired / rc->avg_length[XVID_TYPE_PVOP-1]);          /* Don't laugh at this very 'simple' quant<->size relationship, it
710             * proves to be acurate enough for our algorithm */
711          /* Reign in overflow with huge frames */          scaled_quant = (double)s->quant*(double)s->length/(double)dbytes;
712          if (labs(overflow) > labs(rc->overflow))  
713                  overflow = rc->overflow;  #ifdef COMPENSATE_FORMULA
714            /* We know xvidcore will apply the bframe formula again, so we compensate
715          /* Make sure overflow doesn't run away */           * it right now to make sure we would not apply it twice */
716          if (overflow > desired * rc->param.max_overflow_improvement / 100) {          if(s->type == XVID_TYPE_BVOP) {
                 desired += (overflow <= desired) ? desired * rc->param.max_overflow_improvement / 100 :  
                         overflow * rc->param.max_overflow_improvement / 100;  
         } else if (overflow < desired * rc->param.max_overflow_degradation / -100){  
                 desired += desired * rc->param.max_overflow_degradation / -100;  
         } else {  
                 desired += overflow;  
         }  
717    
718          /* Make sure we are not higher than desired frame size */                  twopass_stat_t *b_ref = s;
         if (desired > rc->max_length) {  
                 capped_to_max_framesize = 1;  
                 desired = rc->max_length;  
                 DPRINTF(XVID_DEBUG_RC,"[%i] Capped to maximum frame size\n",  
                                 data->frame_num);  
         }  
719    
720          /* Make sure to not scale below the minimum framesize */                  /* Find the reference frame */
721          if (desired < rc->min_length[s->type-1]) {                  while(b_ref != &rc->stats[0] && b_ref->type == XVID_TYPE_BVOP)
722                  desired = rc->min_length[s->type-1];                          b_ref--;
723                  DPRINTF(XVID_DEBUG_RC,"[%i] Capped to minimum frame size\n",  
724                                  data->frame_num);                  /* Compute the quant it would be if the core did not apply the bframe
725                     * formula */
726                    scaled_quant  = 100*scaled_quant - data->bquant_offset;
727                    scaled_quant += data->bquant_ratio - 1; /* to avoid rouding issues */
728                    scaled_quant /= data->bquant_ratio;
729          }          }
730    #endif
731    
732          /*          /* Quantizer has been scaled using floating point operations/results, we
733           * Don't laugh at this very 'simple' quant<->filesize relationship, it           * must cast it to integer */
          * proves to be acurate enough for our algorithm  
          */  
         scaled_quant = (double)s->quant*(double)s->length/(double)desired;  
   
         /*  
          * Quantizer has been scaled using floating point operations/results, we  
          * must cast it to integer  
          */  
734          data->quant = (int)scaled_quant;          data->quant = (int)scaled_quant;
735    
736          /* Let's clip the computed quantizer, if needed */          /* Let's clip the computed quantizer, if needed */
# Line 539  Line 738 
738                  data->quant = 1;                  data->quant = 1;
739          } else if (data->quant > 31) {          } else if (data->quant > 31) {
740                  data->quant = 31;                  data->quant = 31;
741          } else if (s->type != XVID_TYPE_IVOP) {          } else {
742    
743                  /*                  /* The frame quantizer has not been clipped, this appears to be a good
                  * The frame quantizer has not been clipped, this appears to be a good  
744                   * computed quantizer, do not loose quantizer decimal part that we                   * computed quantizer, do not loose quantizer decimal part that we
745                   * accumulate for later reuse when its sum represents a complete unit.                   * accumulate for later reuse when its sum represents a complete
746                   */                   * unit. */
747                  rc->quant_error[s->type-1][data->quant] += scaled_quant - (double)data->quant;                  rc->quant_error[s->type-1][data->quant] += scaled_quant - (double)data->quant;
748    
749                  if (rc->quant_error[s->type-1][data->quant] >= 1.0) {                  if (rc->quant_error[s->type-1][data->quant] >= 1.0) {
# Line 555  Line 753 
753                          rc->quant_error[s->type-1][data->quant] += 1.0;                          rc->quant_error[s->type-1][data->quant] += 1.0;
754                          data->quant--;                          data->quant--;
755                  }                  }
   
756          }          }
757    
758          /*          /* Now we have a computed quant that is in the right quante range, with a
          * Now we have a computed quant that is in the right quante range, with a  
759           * possible +1 correction due to cumulated error. We can now safely clip           * possible +1 correction due to cumulated error. We can now safely clip
760           * the quantizer again with user's quant ranges. "Safely" means the Rate           * the quantizer again with user's quant ranges. "Safely" means the Rate
761           * Control could learn more about this quantizer, this knowledge is useful           * Control could learn more about this quantizer, this knowledge is useful
762           * for future frames even if it this quantizer won't be really used atm,           * for future frames even if it this quantizer won't be really used atm,
763           * that's why we don't perform this clipping earlier.           * that's why we don't perform this clipping earlier. */
          */  
764          if (data->quant < data->min_quant[s->type-1]) {          if (data->quant < data->min_quant[s->type-1]) {
765                  data->quant = data->min_quant[s->type-1];                  data->quant = data->min_quant[s->type-1];
766          } else if (data->quant > data->max_quant[s->type-1]) {          } else if (data->quant > data->max_quant[s->type-1]) {
767                  data->quant = data->max_quant[s->type-1];                  data->quant = data->max_quant[s->type-1];
768          }          }
769    
770          /*          if (data->quant < rc->min_quant) data->quant = rc->min_quant;
771           * To avoid big quality jumps from frame to frame, we apply a "security"  
772            /* To avoid big quality jumps from frame to frame, we apply a "security"
773           * rule that makes |last_quant - new_quant| <= 2. This rule only applies           * rule that makes |last_quant - new_quant| <= 2. This rule only applies
774           * to predicted frames (P and B)           * to predicted frames (P and B) */
          */  
775          if (s->type != XVID_TYPE_IVOP && rc->last_quant[s->type-1] && capped_to_max_framesize == 0) {          if (s->type != XVID_TYPE_IVOP && rc->last_quant[s->type-1] && capped_to_max_framesize == 0) {
776    
777                  if (data->quant > rc->last_quant[s->type-1] + 2) {                  if (data->quant > rc->last_quant[s->type-1] + 2) {
778                          data->quant = rc->last_quant[s->type-1] + 2;                          data->quant = rc->last_quant[s->type-1] + 2;
779                          DPRINTF(XVID_DEBUG_RC,                          DPRINTF(XVID_DEBUG_RC,
780                                          "[%i] p/b-frame quantizer prevented from rising too steeply\n",                                          "[xvid rc] -- frame %d p/b-frame quantizer prevented from rising too steeply\n",
781                                          data->frame_num);                                          data->frame_num);
782                  }                  }
783                  if (data->quant < rc->last_quant[s->type-1] - 2) {                  if (data->quant < rc->last_quant[s->type-1] - 2) {
784                          data->quant = rc->last_quant[s->type-1] - 2;                          data->quant = rc->last_quant[s->type-1] - 2;
785                          DPRINTF(XVID_DEBUG_RC,                          DPRINTF(XVID_DEBUG_RC,
786                                          "[%i] p/b-frame quantizer prevented from falling too steeply\n",                                          "[xvid rc] -- frame:%d p/b-frame quantizer prevented from falling too steeply\n",
787                                          data->frame_num);                                          data->frame_num);
788                  }                  }
789          }          }
790    
791          /*          /* We don't want to pollute the RC histerisis when our computed quant has
792           * We don't want to pollute the RC history results when our computed quant           * been computed from a capped frame size */
          * has been computed from a capped frame size  
          */  
793          if (capped_to_max_framesize == 0)          if (capped_to_max_framesize == 0)
794                  rc->last_quant[s->type-1] = data->quant;                  rc->last_quant[s->type-1] = data->quant;
795    
796          /* Force frame type */          /* Don't forget to force 1st pass frame type ;-) */
797          data->type = s->type;          data->type = s->type;
798    
799          return 0;          return 0;
# Line 613  Line 806 
806  rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)  rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)
807  {  {
808          const char frame_type[4] = { 'i', 'p', 'b', 's'};          const char frame_type[4] = { 'i', 'p', 'b', 's'};
809          stat_t * s = &rc->stats[data->frame_num];          twopass_stat_t * s = &rc->stats[data->frame_num];
810    
811          /* Insufficent stats data */          /* Insufficent stats data */
812      if (data->frame_num >= rc->num_frames)      if (data->frame_num >= rc->num_frames)
813          return 0;          return 0;
814    
815      rc->quant_count[data->quant]++;          /* Update the quantizer counter */
816            rc->quant_count[s->type-1][data->quant]++;
817    
818            /* Update the frame type overflow */
819      if (data->type == XVID_TYPE_IVOP) {      if (data->type == XVID_TYPE_IVOP) {
820          int kfdiff = (rc->keyframe_locations[rc->KF_idx] -      rc->keyframe_locations[rc->KF_idx - 1]);                  int kfdiff = 0;
821    
822                    if(rc->KF_idx != rc->num_frames -1) {
823                            kfdiff  = rc->keyframe_locations[rc->KF_idx+1];
824                            kfdiff -= rc->keyframe_locations[rc->KF_idx];
825                    }
826    
827                    /* Flush Keyframe overflow accumulator */
828          rc->overflow += rc->KFoverflow;          rc->overflow += rc->KFoverflow;
829    
830                    /* Store the frame overflow to the keyframe accumulator */
831          rc->KFoverflow = s->desired_length - data->length;          rc->KFoverflow = s->desired_length - data->length;
832    
833          if (kfdiff > 1) {  // non-consecutive keyframes                  if (kfdiff > 1) {
834                            /* Non-consecutive keyframes case:
835                             * We can then divide this total keyframe overflow into equal parts
836                             * that we will distribute into regular overflow at each frame
837                             * between the sequence bounded by two IFrames */
838              rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);              rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);
839          }else{ // consecutive keyframes                  } else {
840                            /* Consecutive keyframes case:
841                             * Flush immediatly the keyframe overflow and reset keyframe
842                             * overflow */
843                          rc->overflow += rc->KFoverflow;                          rc->overflow += rc->KFoverflow;
844                          rc->KFoverflow = 0;                          rc->KFoverflow = 0;
845                          rc->KFoverflow_partial = 0;                          rc->KFoverflow_partial = 0;
846          }          }
847          rc->KF_idx++;          rc->KF_idx++;
848      } else {      } else {
849          // distribute part of the keyframe overflow                  /* Accumulate the frame overflow */
850          rc->overflow += s->desired_length - data->length + rc->KFoverflow_partial;                  rc->overflow += s->desired_length - data->length;
851    
852                    /* Distribute part of the keyframe overflow */
853                    rc->overflow += rc->KFoverflow_partial;
854    
855                    /* Don't forget to substract that same amount from the total keyframe
856                     * overflow */
857          rc->KFoverflow -= rc->KFoverflow_partial;          rc->KFoverflow -= rc->KFoverflow_partial;
858      }      }
859    
860          DPRINTF(XVID_DEBUG_RC, "[%i] type:%c quant:%i stats1:%i scaled:%i actual:%i desired:%d overflow:%i\n",          rc->overflow += (s->error = s->desired_length - data->length);
861            rc->real_total += data->length;
862    
863            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",
864                          data->frame_num,                          data->frame_num,
865                          frame_type[data->type-1],                          frame_type[data->type-1],
866                          data->quant,                          data->quant,
867                          s->length,                          s->length,
868                          s->scaled_length,                          s->scaled_length,
                         data->length,  
869                          s->desired_length,                          s->desired_length,
870                            s->desired_length - s->error,
871                            -s->error,
872                          rc->overflow);                          rc->overflow);
873    
874      return(0);      return(0);
# Line 658  Line 878 
878   * Helper functions definition   * Helper functions definition
879   ****************************************************************************/   ****************************************************************************/
880    
881    /* Default buffer size for reading lines */
882  #define BUF_SZ   1024  #define BUF_SZ   1024
 #define MAX_COLS 5  
883    
884  /* open stats file, and count num frames */  /* Helper functions for reading/parsing the stats file */
885    static char *skipspaces(char *string);
886    static int iscomment(char *string);
887    static char *readline(FILE *f);
888    
889    /* This function counts the number of frame entries in the stats file
890     * It also counts the number of I Frames */
891  static int  static int
892  det_stats_length(rc_2pass2_t * rc, char * filename)  statsfile_count_frames(rc_2pass2_t * rc, char * filename)
893  {  {
894      FILE * f;      FILE * f;
895      int n, ignore;          char *line;
896      char type;          int lines;
897    
898      rc->num_frames = 0;      rc->num_frames = 0;
899      rc->num_keyframes = 0;      rc->num_keyframes = 0;
900    
901      if ((f = fopen(filename, "rt")) == NULL)          if ((f = fopen(filename, "rb")) == NULL)
902          return 0;                  return(-1);
903    
904      while((n = fscanf(f, "%c %d %d %d %d %d %d\n",          lines = 0;
905          &type, &ignore, &ignore, &ignore, &ignore, &ignore, &ignore)) != EOF) {          while ((line = readline(f)) != NULL) {
906          if (type == 'i') {  
907              rc->num_frames++;                  char *ptr;
908                    char type;
909                    int fields;
910    
911                    lines++;
912    
913                    /* We skip spaces */
914                    ptr = skipspaces(line);
915    
916                    /* Skip coment lines or empty lines */
917                    if(iscomment(ptr) || *ptr == '\0') {
918                            free(line);
919                            continue;
920                    }
921    
922                    /* Read the stat line from buffer */
923                    fields = sscanf(ptr, "%c", &type);
924    
925                    /* Valid stats files have at least 7 fields */
926                    if (fields == 1) {
927                            switch(type) {
928                            case 'i':
929                            case 'I':
930              rc->num_keyframes++;              rc->num_keyframes++;
931          }else if (type == 'p' || type == 'b' || type == 's') {                          case 'p':
932                            case 'P':
933                            case 'b':
934                            case 'B':
935                            case 's':
936                            case 'S':
937              rc->num_frames++;              rc->num_frames++;
938                                    break;
939                            default:
940                                    DPRINTF(XVID_DEBUG_RC,
941                                                    "[xvid rc] -- WARNING: L%d unknown frame type used (%c).\n",
942                                                    lines, type);
943          }          }
944                    } else {
945                                    DPRINTF(XVID_DEBUG_RC,
946                                                    "[xvid rc] -- WARNING: L%d misses some stat fields (%d).\n",
947                                                    lines, 7-fields);
948                    }
949    
950                    /* Free the line buffer */
951                    free(line);
952      }      }
953    
954            /* We are done with the file */
955      fclose(f);      fclose(f);
956    
957      return 1;          return(0);
958  }  }
959    
960  /* open stats file(s) and read into rc->stats array */  /* open stats file(s) and read into rc->stats array */
   
961  static int  static int
962  load_stats(rc_2pass2_t *rc, char * filename)  statsfile_load(rc_2pass2_t *rc, char * filename)
963  {  {
964      FILE * f;      FILE * f;
965      int i, not_scaled;          int processed_entries;
966    
967            /* Opens the file */
968            if ((f = fopen(filename, "rb"))==NULL)
969                    return(-1);
970    
971      if ((f = fopen(filename, "rt"))==NULL)          processed_entries = 0;
972          return 0;          while(processed_entries < rc->num_frames) {
   
     i = 0;  
         not_scaled = 0;  
     while(i < rc->num_frames) {  
         stat_t * s = &rc->stats[i];  
         int n;  
973          char type;          char type;
974                    int fields;
975                    twopass_stat_t * s = &rc->stats[processed_entries];
976                    char *line, *ptr;
977    
978                    /* Read the line from the file */
979                    if((line = readline(f)) == NULL)
980                            break;
981    
982                    /* We skip spaces */
983                    ptr = skipspaces(line);
984    
985                    /* Skip comment lines or empty lines */
986                    if(iscomment(ptr) || *ptr == '\0') {
987                            free(line);
988                            continue;
989                    }
990    
991                    /* Reset this field that is optional */
992                  s->scaled_length = 0;                  s->scaled_length = 0;
         n = fscanf(f, "%c %d %d %d %d %d %d\n", &type, &s->quant, &s->blks[0], &s->blks[1], &s->blks[2], &s->length, &s->scaled_length);  
         if (n == EOF) break;  
                 if (n < 7) {  
                         not_scaled = 1;  
                 }  
993    
994          if (type == 'i') {                  /* Convert the fields */
995                    fields = sscanf(ptr,
996                                                    "%c %d %d %d %d %d %d %d\n",
997                                                    &type,
998                                                    &s->quant,
999                                                    &s->blks[0], &s->blks[1], &s->blks[2],
1000                                                    &s->length, &s->invariant /* not really yet */,
1001                                                    &s->scaled_length);
1002    
1003                    /* Free line buffer, we don't need it anymore */
1004                    free(line);
1005    
1006                    /* Fail silently, this has probably been warned in
1007                     * statsfile_count_frames */
1008                    if(fields != 7 && fields != 8)
1009                            continue;
1010    
1011                    /* Convert frame type and compute the invariant length part */
1012                    switch(type) {
1013                    case 'i':
1014                    case 'I':
1015              s->type = XVID_TYPE_IVOP;              s->type = XVID_TYPE_IVOP;
1016          }else if (type == 'p' || type == 's') {                          s->invariant /= INVARIANT_HEADER_PART_IVOP;
1017                            break;
1018                    case 'p':
1019                    case 'P':
1020                    case 's':
1021                    case 'S':
1022              s->type = XVID_TYPE_PVOP;              s->type = XVID_TYPE_PVOP;
1023          }else if (type == 'b') {                          s->invariant /= INVARIANT_HEADER_PART_PVOP;
1024                            break;
1025                    case 'b':
1026                    case 'B':
1027              s->type = XVID_TYPE_BVOP;              s->type = XVID_TYPE_BVOP;
1028          }else{  /* unknown type */                          s->invariant /= INVARIANT_HEADER_PART_BVOP;
1029              DPRINTF(XVID_DEBUG_RC, "unknown stats frame type; assuming pvop\n");                          break;
1030              s->type = XVID_TYPE_PVOP;                  default:
1031                            /* Same as before, fail silently */
1032                            continue;
1033          }          }
1034    
1035          i++;                  /* Ok it seems it's been processed correctly */
1036                    processed_entries++;
1037      }      }
1038    
1039      rc->num_frames = i;          /* Close the file */
   
1040          fclose(f);          fclose(f);
1041    
1042      return 1;          return(0);
 }  
   
 #if 0  
 static void print_stats(rc_2pass2_t * rc)  
 {  
     int i;  
     DPRINTF(XVID_DEBUG_RC, "type quant length scaled_length\n");  
         for (i = 0; i < rc->num_frames; i++) {  
         stat_t * s = &rc->stats[i];  
         DPRINTF(XVID_DEBUG_RC, "%d %d %d %d\n", s->type, s->quant, s->length, s->scaled_length);  
     }  
1043  }  }
 #endif  
1044    
1045  /* pre-process the statistics data  /* pre-process the statistics data
1046      - for each type, count, tot_length, min_length, max_length   * - for each type, count, tot_length, min_length, max_length
1047      - set keyframes_locations   * - set keyframes_locations, tot_prescaled */
 */  
   
1048  static void  static void
1049  pre_process0(rc_2pass2_t * rc)  first_pass_stats_prepare_data(rc_2pass2_t * rc)
1050  {  {
1051      int i,j;      int i,j;
1052    
1053          /*          /* *rc fields initialization
          * *rc fields initialization  
1054           * NB: INT_MAX and INT_MIN are used in order to be immediately replaced           * NB: INT_MAX and INT_MIN are used in order to be immediately replaced
1055           *     with real values of the 1pass           *     with real values of the 1pass */
          */  
1056           for (i=0; i<3; i++) {           for (i=0; i<3; i++) {
1057                  rc->count[i]=0;                  rc->count[i]=0;
1058                  rc->tot_length[i] = 0;                  rc->tot_length[i] = 0;
1059                    rc->tot_invariant[i] = 0;
1060                  rc->min_length[i] = INT_MAX;                  rc->min_length[i] = INT_MAX;
1061      }      }
1062    
1063          rc->max_length = INT_MIN;          rc->max_length = INT_MIN;
1064            rc->tot_weighted = 0;
1065    
1066          /*          /* Loop through all frames and find/compute all the stuff this function
1067           * Loop through all frames and find/compute all the stuff this function           * is supposed to do */
          * is supposed to do  
          */  
1068          for (i=j=0; i<rc->num_frames; i++) {          for (i=j=0; i<rc->num_frames; i++) {
1069                  stat_t * s = &rc->stats[i];                  twopass_stat_t * s = &rc->stats[i];
1070    
1071                  rc->count[s->type-1]++;                  rc->count[s->type-1]++;
1072                  rc->tot_length[s->type-1] += s->length;                  rc->tot_length[s->type-1] += s->length;
1073                    rc->tot_invariant[s->type-1] += s->invariant;
1074                    if (s->zone_mode != XVID_ZONE_QUANT)
1075                            rc->tot_weighted += (int)(s->weight*(s->length - s->invariant));
1076    
1077                  if (s->length < rc->min_length[s->type-1]) {                  if (s->length < rc->min_length[s->type-1]) {
1078                          rc->min_length[s->type-1] = s->length;                          rc->min_length[s->type-1] = s->length;
# Line 796  Line 1088 
1088                  }                  }
1089          }          }
1090    
1091          /*          /* NB:
          * Nota Bene:  
1092           * The "per sequence" overflow system considers a natural sequence to be           * The "per sequence" overflow system considers a natural sequence to be
1093           * formed by all frames between two iframes, so if we want to make sure           * formed by all frames between two iframes, so if we want to make sure
1094           * the system does not go nuts during last sequence, we force the last           * the system does not go nuts during last sequence, we force the last
1095           * frame to appear in the keyframe locations array.           * frame to appear in the keyframe locations array. */
          */  
1096      rc->keyframe_locations[j] = i;      rc->keyframe_locations[j] = i;
1097    
1098          DPRINTF(XVID_DEBUG_RC, "Min 1st pass IFrame length: %d\n", rc->min_length[0]);          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Min 1st pass IFrame length: %d\n", rc->min_length[0]);
1099          DPRINTF(XVID_DEBUG_RC, "Min 1st pass PFrame length: %d\n", rc->min_length[1]);          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Min 1st pass PFrame length: %d\n", rc->min_length[1]);
1100          DPRINTF(XVID_DEBUG_RC, "Min 1st pass BFrame length: %d\n", rc->min_length[2]);          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Min 1st pass BFrame length: %d\n", rc->min_length[2]);
1101  }  }
1102    
1103  /* calculate zone weight "center" */  /* calculate zone weight "center" */
   
1104  static void  static void
1105  zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)  zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)
1106  {  {
1107      int i,j;      int i,j;
1108      int n = 0;      int n = 0;
1109    
     rc->avg_weight = 0.0;  
1110      rc->tot_quant = 0;      rc->tot_quant = 0;
1111            rc->tot_quant_invariant = 0;
1112    
1113      if (create->num_zones == 0) {      if (create->num_zones == 0) {
1114          for (j = 0; j < rc->num_frames; j++) {          for (j = 0; j < rc->num_frames; j++) {
1115              rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;              rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1116              rc->stats[j].weight = 1.0;              rc->stats[j].weight = 1.0;
1117          }          }
         rc->avg_weight += rc->num_frames * 1.0;  
1118          n += rc->num_frames;          n += rc->num_frames;
1119      }      }
1120    
# Line 836  Line 1123 
1123    
1124          int next = (i+1<create->num_zones) ? create->zones[i+1].frame : rc->num_frames;          int next = (i+1<create->num_zones) ? create->zones[i+1].frame : rc->num_frames;
1125    
1126                    /* Zero weight make no sense */
1127                    if (create->zones[i].increment == 0) create->zones[i].increment = 1;
1128                    /* And obviously an undetermined infinite makes even less sense */
1129                    if (create->zones[i].base == 0) create->zones[i].base = 1;
1130    
1131          if (i==0 && create->zones[i].frame > 0) {          if (i==0 && create->zones[i].frame > 0) {
1132              for (j = 0; j < create->zones[i].frame && j < rc->num_frames; j++) {              for (j = 0; j < create->zones[i].frame && j < rc->num_frames; j++) {
1133                  rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;                  rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1134                  rc->stats[j].weight = 1.0;                  rc->stats[j].weight = 1.0;
1135              }              }
             rc->avg_weight += create->zones[i].frame * 1.0;  
1136              n += create->zones[i].frame;              n += create->zones[i].frame;
1137          }          }
1138    
# Line 851  Line 1142 
1142                  rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;                  rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;
1143              }              }
1144              next -= create->zones[i].frame;              next -= create->zones[i].frame;
             rc->avg_weight += (double)(next * create->zones[i].increment) / (double)create->zones[i].base;  
1145              n += next;              n += next;
1146          }else{  // XVID_ZONE_QUANT                  } else{  /* XVID_ZONE_QUANT */
1147              for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {              for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {
1148                  rc->stats[j].zone_mode = XVID_ZONE_QUANT;                  rc->stats[j].zone_mode = XVID_ZONE_QUANT;
1149                  rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;                  rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;
1150                  rc->tot_quant += rc->stats[j].length;                  rc->tot_quant += rc->stats[j].length;
1151                                    rc->tot_quant_invariant += rc->stats[j].invariant;
1152              }              }
1153          }          }
1154      }      }
     rc->avg_weight = n>0 ? rc->avg_weight/n : 1.0;  
   
     DPRINTF(XVID_DEBUG_RC, "center_weight: %f (for %i frames);   fixed_bytes: %i\n", rc->avg_weight, n, rc->tot_quant);  
1155  }  }
1156    
1157    
1158  /* scale the curve */  /* scale the curve */
   
1159  static void  static void
1160  internal_scale(rc_2pass2_t *rc)  first_pass_scale_curve_internal(rc_2pass2_t *rc)
1161  {  {
1162          int64_t target  = rc->target - rc->tot_quant;          int64_t target;
1163          int64_t pass1_length = rc->tot_length[0] + rc->tot_length[1] + rc->tot_length[2] - rc->tot_quant;          int64_t total_invariant;
1164          double scaler;          double scaler;
1165          int i, num_MBs;          int i, num_MBs;
1166    
1167            /* We only scale texture data ! */
1168            total_invariant  = rc->tot_invariant[XVID_TYPE_IVOP-1];
1169            total_invariant += rc->tot_invariant[XVID_TYPE_PVOP-1];
1170            total_invariant += rc->tot_invariant[XVID_TYPE_BVOP-1];
1171            /* don't forget to substract header bytes used in quant zones, otherwise we
1172             * counting them twice */
1173            total_invariant -= rc->tot_quant_invariant;
1174    
1175            /* We remove the bytes used by the fixed quantizer zones during first pass
1176             * with the same quants, so we know very precisely how much that
1177             * represents */
1178            target  = rc->target;
1179            target -= rc->tot_quant;
1180    
1181          /* Let's compute a linear scaler in order to perform curve scaling */          /* Let's compute a linear scaler in order to perform curve scaling */
1182          scaler = (double)target / (double)pass1_length;          scaler = (double)(target - total_invariant) / (double)(rc->tot_weighted);
1183    
1184          if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {  #ifdef SMART_OVERFLOW_SETTING
1185                  DPRINTF(XVID_DEBUG_RC, "WARNING: Undersize detected\n");          if (scaler > 0.9) {
1186          scaler = 1.0;                  rc->param.max_overflow_degradation *= 5;
1187                    rc->param.max_overflow_improvement *= 5;
1188                    rc->param.overflow_control_strength *= 3;
1189            } else if (scaler > 0.6) {
1190                    rc->param.max_overflow_degradation *= 2;
1191                    rc->param.max_overflow_improvement *= 2;
1192                    rc->param.overflow_control_strength *= 2;
1193            } else {
1194                    rc->min_quant = 2;
1195          }          }
1196    #endif
1197    
1198      DPRINTF(XVID_DEBUG_RC,          /* Compute min frame lengths (for each frame type) according to the number
1199                          "Before correction: target=%i, tot_length=%i, scaler=%f\n",           * of MBs. We sum all block type counters of frame 0, this gives us the
1200                          (int)target, (int)pass1_length, scaler);           * number of MBs.
   
         /*  
          * Compute min frame lengths (for each frame type) according to the number  
          * of MBs. We sum all blocks count from frame 0 (should be an IFrame, so  
          * blocks[0] should be enough) to know how many MBs there are.  
1201           *           *
1202           * We compare these hardcoded values with observed values in first pass           * We compare these hardcoded values with observed values in first pass
1203           * (determined in pre_process0).Then we keep the real minimum.           * (determined in pre_process0).Then we keep the real minimum. */
          */  
         num_MBs = rc->stats[0].blks[0] + rc->stats[0].blks[1] + rc->stats[0].blks[2];  
   
         if(rc->min_length[0] > ((num_MBs*22) + 240) / 8)  
                 rc->min_length[0] = ((num_MBs*22) + 240) / 8;  
   
         if(rc->min_length[1] > ((num_MBs) + 88)  / 8)  
                 rc->min_length[1] = ((num_MBs) + 88)  / 8;  
1204    
1205          if(rc->min_length[2] > 8)          /* Number of MBs */
1206                  rc->min_length[2] = 8;          num_MBs  = rc->stats[0].blks[0];
1207            num_MBs += rc->stats[0].blks[1];
1208            num_MBs += rc->stats[0].blks[2];
1209    
1210            /* Minimum for I frames */
1211            if(rc->min_length[XVID_TYPE_IVOP-1] > ((num_MBs*22) + 240) / 8)
1212                    rc->min_length[XVID_TYPE_IVOP-1] = ((num_MBs*22) + 240) / 8;
1213    
1214            /* Minimum for P/S frames */
1215            if(rc->min_length[XVID_TYPE_PVOP-1] > ((num_MBs) + 88)  / 8)
1216                    rc->min_length[XVID_TYPE_PVOP-1] = ((num_MBs) + 88)  / 8;
1217    
1218            /* Minimum for B frames */
1219            if(rc->min_length[XVID_TYPE_BVOP-1] > 8)
1220                    rc->min_length[XVID_TYPE_BVOP-1] = 8;
1221    
1222          /*          /* Perform an initial scale pass.
1223           * Perform an initial scale pass.           *
1224           * If a frame size is scaled underneath our hardcoded minimums, then we           * If a frame size is scaled underneath our hardcoded minimums, then we
1225           * force the frame size to the minimum, and deduct the original & scaled           * force the frame size to the minimum, and deduct the original & scaled
1226           * frame length from the original and target total lengths           * frame length from the original and target total lengths */
          */  
1227          for (i=0; i<rc->num_frames; i++) {          for (i=0; i<rc->num_frames; i++) {
1228                  stat_t * s = &rc->stats[i];                  twopass_stat_t * s = &rc->stats[i];
1229                  int len;                  int len;
1230    
1231                    /* No need to scale frame length for which a specific quantizer is
1232                     * specified thanks to zones */
1233          if (s->zone_mode == XVID_ZONE_QUANT) {          if (s->zone_mode == XVID_ZONE_QUANT) {
1234              s->scaled_length = s->length;              s->scaled_length = s->length;
1235                          continue;                          continue;
1236                  }                  }
1237    
1238                  /* Compute the scaled length */                  /* Compute the scaled length -- only non invariant data length is scaled */
1239                  len = (int)((double)s->length * scaler * s->weight / rc->avg_weight);                  len = s->invariant + (int)((double)(s->length-s->invariant) * scaler * s->weight);
1240    
1241                  /* Compare with the computed minimum */                  /* Compare with the computed minimum */
1242                  if (len < rc->min_length[s->type-1]) {                  if (len < rc->min_length[s->type-1]) {
1243                          /* force frame size to our computed minimum */                          /* This is a 'forced size' frame, set its frame size to the
1244                             * computed minimum */
1245                          s->scaled_length = rc->min_length[s->type-1];                          s->scaled_length = rc->min_length[s->type-1];
1246    
1247                            /* Remove both scaled and original size from their respective
1248                             * total counters, as we prepare a second pass for 'regular'
1249                             * frames */
1250                          target -= s->scaled_length;                          target -= s->scaled_length;
                         pass1_length -= s->length;  
1251                  } else {                  } else {
1252                          /* Do nothing for now, we'll scale this later */                          /* Do nothing for now, we'll scale this later */
1253                          s->scaled_length = 0;                          s->scaled_length = 0;
1254                  }                  }
1255          }          }
1256    
1257          /* Correct the scaler for all non forced frames */          /* The first pass on data substracted all 'forced size' frames from the
1258          scaler = (double)target / (double)pass1_length;           * total counters. Now, it's possible to scale the 'regular' frames. */
1259    
1260          /* Detect undersizing */          /* Scaling factor for 'regular' frames */
1261      if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {          scaler = (double)(target - total_invariant) / (double)(rc->tot_weighted);
                 DPRINTF(XVID_DEBUG_RC, "WARNING: Undersize detected\n");  
                 scaler = 1.0;  
         }  
   
         DPRINTF(XVID_DEBUG_RC,  
                         "After correction: target=%i, tot_length=%i, scaler=%f\n",  
                         (int)target, (int)pass1_length, scaler);  
1262    
1263          /* Do another pass with the new scaler */          /* Do another pass with the new scaler */
1264          for (i=0; i<rc->num_frames; i++) {          for (i=0; i<rc->num_frames; i++) {
1265                  stat_t * s = &rc->stats[i];                  twopass_stat_t * s = &rc->stats[i];
1266    
1267                  /* Ignore frame with forced frame sizes */                  /* Ignore frame with forced frame sizes */
1268                  if (s->scaled_length == 0)                  if (s->scaled_length == 0)
1269                          s->scaled_length = (int)((double)s->length * scaler * s->weight / rc->avg_weight);                          s->scaled_length = s->invariant + (int)((double)(s->length-s->invariant) * scaler * s->weight);
1270          }          }
1271    
1272            /* Job done */
1273            return;
1274  }  }
1275    
1276    /* Apply all user settings to the scaled curve
1277     * This implies:
1278     *   keyframe boosting
1279     *   high/low compression */
1280  static void  static void
1281  pre_process1(rc_2pass2_t * rc)  scaled_curve_apply_advanced_parameters(rc_2pass2_t * rc)
1282  {  {
1283      int i;      int i;
1284      double total1, total2;          int64_t ivop_boost_total;
     uint64_t ivop_boost_total;  
1285    
1286      ivop_boost_total = 0;          /* Reset the rate controller (per frame type) total byte counters */
1287      rc->curve_comp_error = 0;          for (i=0; i<3; i++) rc->tot_scaled_length[i] = 0;
1288    
1289      for (i=0; i<3; i++) {          /* Compute total bytes for each frame type */
1290          rc->tot_scaled_length[i] = 0;          for (i=0; i<rc->num_frames;i++) {
1291                    twopass_stat_t *s = &rc->stats[i];
1292                    rc->tot_scaled_length[s->type-1] += s->scaled_length;
1293      }      }
1294    
1295            /* First we compute the total amount of bits needed, as being described by
1296             * the scaled distribution. During this pass over the complete stats data,
1297             * we see how much bits two user settings will get/give from/to p&b frames:
1298             *  - keyframe boosting
1299             *  - keyframe distance penalty */
1300            rc->KF_idx = 0;
1301            ivop_boost_total = 0;
1302      for (i=0; i<rc->num_frames; i++) {      for (i=0; i<rc->num_frames; i++) {
1303          stat_t * s = &rc->stats[i];                  twopass_stat_t * s = &rc->stats[i];
   
         rc->tot_scaled_length[s->type-1] += s->scaled_length;  
1304    
1305                    /* Some more work is needed for I frames */
1306          if (s->type == XVID_TYPE_IVOP) {          if (s->type == XVID_TYPE_IVOP) {
1307              ivop_boost_total += s->scaled_length * rc->param.keyframe_boost / 100;                          int ivop_boost;
1308    
1309                            /* Accumulate bytes needed for keyframe boosting */
1310                            ivop_boost = s->scaled_length*rc->param.keyframe_boost/100;
1311    
1312    #if 0 /* ToDo: decide how to apply kfthresholding */
1313    #endif
1314                            /* If the frame size drops under the minimum length, then cap ivop_boost */
1315                            if (ivop_boost + s->scaled_length < rc->min_length[XVID_TYPE_IVOP-1])
1316                                    ivop_boost = rc->min_length[XVID_TYPE_IVOP-1] - s->scaled_length;
1317    
1318                            /* Accumulate the ivop boost */
1319                            ivop_boost_total += ivop_boost;
1320    
1321                            /* Don't forget to update the keyframe index */
1322                            rc->KF_idx++;
1323          }          }
1324      }      }
1325    
1326      rc->movie_curve = ((double)(rc->tot_scaled_length[XVID_TYPE_PVOP-1] + rc->tot_scaled_length[XVID_TYPE_BVOP-1] + ivop_boost_total) /          /* Initialize the IBoost tax ratio for P/S/B frames
1327                                          (rc->tot_scaled_length[XVID_TYPE_PVOP-1] + rc->tot_scaled_length[XVID_TYPE_BVOP-1]));           *
1328             * This ratio has to be applied to p/b/s frames in order to reserve
1329             * additional bits for keyframes (keyframe boosting) or if too much
1330             * keyframe distance is applied, bits retrieved from the keyframes.
1331             *
1332             * ie pb_length *= rc->pb_iboost_tax_ratio;
1333             *
1334             *    gives the ideal length of a p/b frame */
1335    
1336            /* Compute the total length of p/b/s frames (temporary storage into
1337             * movie_curve) */
1338            rc->pb_iboost_tax_ratio  = (double)rc->tot_scaled_length[XVID_TYPE_PVOP-1];
1339            rc->pb_iboost_tax_ratio += (double)rc->tot_scaled_length[XVID_TYPE_BVOP-1];
1340    
1341            /* Compute the ratio described above
1342             *     taxed_total = sum(0, n, tax*scaled_length)
1343             * <=> taxed_total = tax.sum(0, n, scaled_length)
1344             * <=> tax = taxed_total / original_total */
1345            rc->pb_iboost_tax_ratio =
1346                    (rc->pb_iboost_tax_ratio - ivop_boost_total) /
1347                    rc->pb_iboost_tax_ratio;
1348    
1349            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- IFrame boost tax ratio:%.2f\n",
1350                            rc->pb_iboost_tax_ratio);
1351    
1352            /* Compute the average size of frames per frame type */
1353      for(i=0; i<3; i++) {      for(i=0; i<3; i++) {
1354          if (rc->count[i] == 0 || rc->movie_curve == 0) {                  /* Special case for missing type or weird case */
1355                    if (rc->count[i] == 0 || rc->pb_iboost_tax_ratio == 0) {
1356              rc->avg_length[i] = 1;              rc->avg_length[i] = 1;
1357          }else{          }else{
1358              rc->avg_length[i] = rc->tot_scaled_length[i] / rc->count[i] / rc->movie_curve;                          rc->avg_length[i] = rc->tot_scaled_length[i];
1359          }  
1360                            if (i == (XVID_TYPE_IVOP-1)) {
1361                                    /* I Frames total has to be added the boost total */
1362                                    rc->avg_length[i] += ivop_boost_total;
1363                            } else {
1364                                    /* P/B frames has to taxed */
1365                                    rc->avg_length[i] *= rc->pb_iboost_tax_ratio;
1366      }      }
1367    
1368      /* --- */                          /* Finally compute the average frame size */
1369                            rc->avg_length[i] /= (double)rc->count[i];
1370                    }
1371            }
1372    
1373      total1=total2=0;          /* Assymetric curve compression */
1374            if (rc->param.curve_compression_high || rc->param.curve_compression_low) {
1375                    double symetric_total;
1376                    double assymetric_delta_total;
1377    
1378                    /* Like I frame boosting, assymetric curve compression modifies the total
1379                     * amount of needed bits, we must compute the ratio so we can prescale
1380                     lengths */
1381                    symetric_total = 0;
1382                    assymetric_delta_total = 0;
1383      for (i=0; i<rc->num_frames; i++) {      for (i=0; i<rc->num_frames; i++) {
1384          stat_t * s = &rc->stats[i];                          double assymetric_delta;
1385                            double dbytes;
1386                            twopass_stat_t * s = &rc->stats[i];
1387    
1388          if (s->type != XVID_TYPE_IVOP) {                          /* I Frames are not concerned by assymetric scaling */
1389              double dbytes,dbytes2;                          if (s->type == XVID_TYPE_IVOP)
1390                                    continue;
1391    
1392                            /* During the real run, we would have to apply the iboost tax */
1393                            dbytes = s->scaled_length * rc->pb_iboost_tax_ratio;
1394    
1395              dbytes = s->scaled_length / rc->movie_curve;                          /* Update the symmetric curve compression total */
1396              dbytes2 = 0; /* XXX: warning */                          symetric_total += dbytes;
             total1 += dbytes;  
             if (s->type == XVID_TYPE_BVOP)  
                 dbytes *= rc->avg_length[XVID_TYPE_PVOP-1] / rc->avg_length[XVID_TYPE_BVOP-1];  
1397    
1398                          if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                          /* Apply assymetric curve compression */
1399                                  dbytes2=((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_high / 100.0);                          if (dbytes > rc->avg_length[s->type-1])
1400                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * (double)rc->param.curve_compression_high / 100.0f;
1401                            else
1402                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * (double)rc->param.curve_compression_low  / 100.0f;
1403    
1404                            /* Cap to the minimum frame size if needed */
1405                            if (dbytes + assymetric_delta < rc->min_length[s->type-1])
1406                                    assymetric_delta = rc->min_length[s->type-1] - dbytes;
1407    
1408                            /* Accumulate after assymetric curve compression */
1409                            assymetric_delta_total += assymetric_delta;
1410                    }
1411    
1412                    /* Compute the tax that all p/b frames have to pay in order to respect the
1413                     * bit distribution changes that the assymetric compression curve imposes
1414                     * We want assymetric_total = sum(0, n-1, tax.scaled_length)
1415                     *      ie assymetric_total = ratio.sum(0, n-1, scaled_length)
1416                     *         ratio = assymetric_total / symmetric_total */
1417                    rc->assymetric_tax_ratio = ((double)symetric_total - (double)assymetric_delta_total) / (double)symetric_total;
1418                          } else {                          } else {
1419                                  dbytes2 = ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_low / 100.0);                  rc->assymetric_tax_ratio = 1.0f;
1420                          }                          }
1421    
1422              if (s->type == XVID_TYPE_BVOP) {          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Assymetric tax ratio:%.2f\n", rc->assymetric_tax_ratio);
1423                              dbytes2 *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
1424                              if (dbytes2 < rc->min_length[XVID_TYPE_BVOP-1])          /* Last bits that need to be reset */
1425                                      dbytes2 = rc->min_length[XVID_TYPE_BVOP-1];          rc->overflow = 0;
1426            rc->KFoverflow = 0;
1427            rc->KFoverflow_partial = 0;
1428            rc->KF_idx = 0;
1429            rc->desired_total = 0;
1430            rc->real_total = 0;
1431    
1432            /* Job done */
1433            return;
1434    }
1435    
1436    /*****************************************************************************
1437     * VBV compliancy check and scale
1438     * MPEG-4 standard specifies certain restrictions for bitrate/framesize in VBR
1439     * to enable playback on devices with limited readspeed and memory (and which
1440     * aren't...)
1441     *
1442     * DivX profiles have 2 criteria: VBV as in MPEG standard
1443     *                                a limit on peak bitrate for any 3 seconds
1444     *
1445     * But if VBV is fulfilled, peakrate is automatically fulfilled in any profile
1446     * define so far, so we check for it (for completeness) but correct only VBV
1447     *
1448     *****************************************************************************/
1449    
1450    #define VBV_COMPLIANT 0
1451    #define VBV_UNDERFLOW 1 /* video buffer runs empty */
1452    #define VBV_OVERFLOW 2  /* doesn't exist for VBR encoding */
1453    #define VBV_PEAKRATE 4  /* peak bitrate (within 3s) violated */
1454    
1455    static int
1456    check_curve_for_vbv_compliancy(rc_2pass2_t * rc, const float fps)
1457    {
1458            /* We do all calculations in float, for higher accuracy,
1459             * and in bytes for convenience.
1460             *
1461             * typical values from DivX Home Theater profile:
1462             *  vbv_size= 384*1024 (384kB)
1463             *  vbv_initial= 288*1024 (75% fill)
1464             *  maxrate= 4000000 (4MBps)
1465             *  peakrate= 10000000 (10MBps)
1466             *
1467             *  PAL: offset3s = 75 (3 seconds of 25fps)
1468             *  NTSC: offset3s = 90 (3 seconds of 29.97fps) or 72 (3 seconds of 23.976fps)
1469             */
1470    
1471            const float vbv_size = (float)rc->param.vbv_size/8.f;
1472            float vbvfill = (float)rc->param.vbv_initial/8.f;
1473            float vbvmin;
1474    
1475            const float maxrate = (float)rc->param.vbv_maxrate;
1476            const float peakrate = (float)rc->param.vbv_peakrate;
1477            const float r0 = (int)(maxrate/fps+0.5)/8.f;
1478    
1479            int bytes3s = 0;
1480            int offset3s = (int)(3.f*fps+0.5);
1481            int i;
1482    
1483            /* 1Gbit should be enough to inuitialize the vbvmin
1484             *      an arbitrary high value */
1485            vbvmin = 1000*1000*1000;
1486    
1487            for (i=0; i<rc->num_frames; i++) {
1488                    /* DivX 3s peak bitrate check  */
1489                    bytes3s += rc->stats[i].scaled_length;
1490                    if (i>=offset3s)
1491                            bytes3s -= rc->stats[i-offset3s].scaled_length;
1492    
1493                    if (8.f*bytes3s > 3*peakrate)
1494                            return(VBV_PEAKRATE);
1495    
1496                    /* update vbv fill level */
1497                    vbvfill += r0 - rc->stats[i].scaled_length;
1498    
1499                    /* this check is _NOT_ an "overflow"! only reading from disk stops then */
1500                    if (vbvfill > vbv_size)
1501                            vbvfill = vbv_size;
1502    
1503                    /* but THIS would be an underflow. report it! */
1504                    if (vbvfill < 0)
1505                            return(VBV_UNDERFLOW);
1506    
1507                    /* Store the minimum buffer filling */
1508                    if (vbvfill < vbvmin)
1509                            vbvmin = vbvfill;
1510            }
1511    
1512            DPRINTF(XVID_DEBUG_RC, "[xvid rc] Minimum buffer fill: %f bytes\n", vbvmin);
1513    
1514            return(VBV_COMPLIANT);
1515    }
1516    
1517    
1518    static int
1519    scale_curve_for_vbv_compliancy(rc_2pass2_t * rc, const float fps)
1520    {
1521            /* correct any VBV violations. Peak bitrate violations disappears
1522             * by this automatically
1523             *
1524             * This implementation follows
1525             *
1526             * Westerink, Rajagopalan, Gonzales "Two-pass MPEG-2 variable-bitrate encoding"
1527             * IBM J. RES. DEVELOP. VOL 43, No. 4, July 1999, p.471--488
1528             *
1529             * Thanks, guys! This paper rocks!!! */
1530    
1531            /* For each scene of len N, we have to check up to N^2 possible buffer fills.
1532             * This works well with MPEG-2 where N==12 or so, but for MPEG-4 it's a
1533             * little slow...
1534             *
1535             * TODO: Better control on VBVfill between scenes */
1536    
1537            const float vbv_size = (float)rc->param.vbv_size/8.f;
1538            const float vbv_initial = (float)rc->param.vbv_initial/8.f;
1539    
1540            const float maxrate = 0.9*rc->param.vbv_maxrate;
1541            const float vbv_low = 0.10f*vbv_size;
1542            const float r0 = (int)(maxrate/fps+0.5)/8.f;
1543    
1544            int i,k,l,n,violation = 0;
1545            float *scenefactor;
1546            int *scenestart;
1547            int *scenelength;
1548    
1549            /* first step: determine how many "scenes" there are and store their
1550             * boundaries we could get all this from existing keyframe_positions,
1551             * somehow, but there we don't have a min_scenelength, and it's no big
1552             * deal to get it again. */
1553    
1554            const int min_scenelength = (int)(fps+0.5);
1555            int num_scenes = 0;
1556            int last_scene = -999;
1557            for (i=0; i<rc->num_frames; i++) {
1558                    if ((rc->stats[i].type == XVID_TYPE_IVOP) && (i-last_scene>min_scenelength)) {
1559                            last_scene = i;
1560                            num_scenes++;
1561                    }
1562            }
1563    
1564            scenefactor = (float*)malloc(num_scenes*sizeof(float));
1565            scenestart = (int*)malloc(num_scenes*sizeof(int));
1566            scenelength = (int*)malloc(num_scenes*sizeof(int));
1567    
1568            if ((!scenefactor) || (!scenestart) || (!scenelength) ) {
1569                    free(scenefactor);
1570                    free(scenestart);
1571                    free(scenelength);
1572                    /* remember: free(0) is valid and does exactly nothing. */
1573                    return(-1);
1574            }
1575    
1576            /* count again and safe the length/position */
1577    
1578            num_scenes = 0;
1579            last_scene = -999;
1580            for (i=0; i<rc->num_frames; i++) {
1581                    if ((rc->stats[i].type == XVID_TYPE_IVOP) && (i-last_scene>min_scenelength)) {
1582                            if (num_scenes>0) {
1583                                    scenelength[num_scenes-1]=i-last_scene;
1584                            }
1585                            scenestart[num_scenes]=i;
1586                            num_scenes++;
1587                            last_scene = i;
1588                    }
1589            }
1590            scenelength[num_scenes-1]=i-last_scene;
1591    
1592            /* second step: check for each scene, how much we can scale its frames up or
1593             * down such that the VBV restriction is just fulfilled */
1594    #define R(k,n) (((n)+1-(k))*r0)     /* how much enters the buffer between frame k and n */
1595            for (l=0; l<num_scenes;l++) {
1596                    const int start = scenestart[l];
1597                    const int length = scenelength[l];
1598                    twopass_stat_t * frames = &rc->stats[start];
1599    
1600                    float S0n,Skn;
1601                    float f,minf = 99999.f;
1602    
1603                    S0n=0.;
1604                    for (n=0;n<=length-1;n++) {
1605                            S0n += frames[n].scaled_length;
1606    
1607                            k = 0;
1608                            Skn = S0n;
1609                            f = (R(k,n-1) + (vbv_initial - vbv_low)) / Skn;
1610                            if (f < minf)
1611                                    minf = f;
1612    
1613                            for (k=1;k<=n;k++) {
1614                                    Skn -= frames[k].scaled_length;
1615    
1616                                    f = (R(k,n-1) + (vbv_size - vbv_low)) / Skn;
1617                                    if (f < minf)
1618                                            minf = f;
1619                            }
1620                    }
1621    
1622                    /* special case: at the end, fill buffer up to vbv_initial again
1623                     *
1624                     * TODO: Allow other values for buffer fill between scenes
1625                     * e.g. if n=N is smallest f-value, then check for better value */
1626    
1627                    n=length;
1628                    k=0;
1629                    Skn = S0n;
1630                    f = R(k,n-1)/Skn;
1631                    if (f < minf)
1632                            minf = f;
1633    
1634                    for (k=1;k<=n-1;k++) {
1635                            Skn -= frames[k].scaled_length;
1636    
1637                            f = (R(k,n-1) + (vbv_initial - vbv_low)) / Skn;
1638                            if (f < minf)
1639                                    minf = f;
1640                    }
1641    
1642                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] Scene %d (Frames %d-%d): VBVfactor %f\n",
1643                                    l, start, start+length-1 , minf);
1644    
1645                    scenefactor[l] = minf;
1646            }
1647    #undef R
1648    
1649            /* last step: now we know of any scene how much it can be scaled up or down
1650             * without violating VBV. Next, distribute bits from the evil scenes to the
1651             * good ones */
1652            do {
1653                    float S_red = 0.f;    /* how much to redistribute */
1654                    float S_elig = 0.f;   /* sum of bit for those scenes you can still swallow something*/
1655                    float f_red;
1656                    int l;
1657    
1658                    /* check how much is wrong */
1659                    for (l=0;l<num_scenes;l++) {
1660                            const int start = scenestart[l];
1661                            const int length = scenelength[l];
1662                            twopass_stat_t * frames = &rc->stats[start];
1663    
1664                            /* exactly 1 means "don't touch this anymore!" */
1665                            if (scenefactor[l] == 1.)
1666                                    continue;
1667    
1668                            /* within limits */
1669                            if (scenefactor[l] > 1.) {
1670                                    for (n= 0; n < length; n++)
1671                                            S_elig += frames[n].scaled_length;
1672              }else{              }else{
1673                              if (dbytes2 < rc->min_length[XVID_TYPE_PVOP-1])                                  /* underflowing segment */
1674                                      dbytes2 = rc->min_length[XVID_TYPE_PVOP-1];                                  for (n= 0; n < length; n++) {
1675                                            float newbytes = (float)frames[n].scaled_length * scenefactor[l];
1676                                            S_red += (float)frames[n].scaled_length - (float)newbytes;
1677                                            frames[n].scaled_length =(int)newbytes;
1678              }              }
1679              total2 += dbytes2;                                  scenefactor[l] = 1.f;
1680          }          }
1681      }      }
1682    
1683      rc->curve_comp_scale = total1 / total2;                  /* no more underflows */
1684                    if (S_red < 1.f)
1685                            break;
1686    
1687          DPRINTF(XVID_DEBUG_RC, "middle frame size for asymmetric curve compression: %i\n",                  if (S_elig < 1.f) {
1688              (int)(rc->avg_length[XVID_TYPE_PVOP-1] * rc->curve_comp_scale));                          DPRINTF(XVID_DEBUG_RC, "[xvid rc] Everything underflowing.\n");
1689                            free(scenefactor);
1690                            free(scenestart);
1691                            free(scenelength);
1692                            return(-2);
1693                    }
1694    
1695      rc->overflow = 0;                  f_red = (1.f + S_red/S_elig);
1696      rc->KFoverflow = 0;  
1697      rc->KFoverflow_partial = 0;                  DPRINTF(XVID_DEBUG_RC, "[xvid rc] Moving %.0f kB to avoid buffer underflow, correction factor: %.5f\n",
1698      rc->KF_idx = 1;                                  S_red/1024.f, f_red);
1699    
1700                    violation=0;
1701                    /* scale remaining scenes up to meet total size */
1702                    for (l=0; l<num_scenes; l++) {
1703                            const int start = scenestart[l];
1704                            const int length = scenelength[l];
1705                            twopass_stat_t * frames = &rc->stats[start];
1706    
1707                            if (scenefactor[l] == 1.)
1708                                    continue;
1709    
1710                            /* there shouldn't be any segments with factor<1 left, so all the rest is >1 */
1711                            for (n= 0; n < length; n++) {
1712                                    frames[n].scaled_length = (int)(frames[n].scaled_length * f_red + 0.5);
1713  }  }
1714    
1715                            scenefactor[l] /= f_red;
1716                            if (scenefactor[l] < 1.f)
1717                                    violation=1;
1718                    }
1719    
1720            } while (violation);
1721    
1722            free(scenefactor);
1723            free(scenestart);
1724            free(scenelength);
1725            return(0);
1726    }
1727    
1728    
1729    /*****************************************************************************
1730     * Still more low level stuff (nothing to do with stats treatment)
1731     ****************************************************************************/
1732    
1733    /* This function returns an allocated string containing a complete line read
1734     * from the file starting at the current position */
1735    static char *
1736    readline(FILE *f)
1737    {
1738            char *buffer = NULL;
1739            int buffer_size = 0;
1740            int pos = 0;
1741    
1742            do {
1743                    int c;
1744    
1745                    /* Read a character from the stream */
1746                    c = fgetc(f);
1747    
1748                    /* Is that EOF or new line ? */
1749                    if(c == EOF || c == '\n')
1750                            break;
1751    
1752                    /* Do we have to update buffer ? */
1753                    if(pos >= buffer_size - 1) {
1754                            buffer_size += BUF_SZ;
1755                            buffer = (char*)realloc(buffer, buffer_size);
1756                            if (buffer == NULL)
1757                                    return(NULL);
1758                    }
1759    
1760                    buffer[pos] = c;
1761                    pos++;
1762            } while(1);
1763    
1764            /* Read \n or EOF */
1765            if (buffer == NULL) {
1766                    /* EOF, so we reached the end of the file, return NULL */
1767                    if(feof(f))
1768                            return(NULL);
1769    
1770                    /* Just an empty line with just a newline, allocate a 1 byte buffer to
1771                     * store a zero length string */
1772                    buffer = (char*)malloc(1);
1773                    if(buffer == NULL)
1774                            return(NULL);
1775            }
1776    
1777            /* Zero terminated string */
1778            buffer[pos] = '\0';
1779    
1780            return(buffer);
1781    }
1782    
1783    /* This function returns a pointer to the first non space char in the given
1784     * string */
1785    static char *
1786    skipspaces(char *string)
1787    {
1788            const char spaces[] =
1789                    {
1790                            ' ','\t','\0'
1791                    };
1792            const char *spacechar = spaces;
1793    
1794            if (string == NULL) return(NULL);
1795    
1796            while (*string != '\0') {
1797                    /* Test against space chars */
1798                    while (*spacechar != '\0') {
1799                            if (*string == *spacechar) {
1800                                    string++;
1801                                    spacechar = spaces;
1802                                    break;
1803                            }
1804                            spacechar++;
1805                    }
1806    
1807                    /* No space char */
1808                    if (*spacechar == '\0') return(string);
1809            }
1810    
1811            return(string);
1812    }
1813    
1814    /* This function returns a boolean that tells if the string is only a
1815     * comment */
1816    static int
1817    iscomment(char *string)
1818    {
1819            const char comments[] =
1820                    {
1821                            '#',';', '%', '\0'
1822                    };
1823            const char *cmtchar = comments;
1824            int iscomment = 0;
1825    
1826            if (string == NULL) return(1);
1827    
1828            string = skipspaces(string);
1829    
1830            while(*cmtchar != '\0') {
1831                    if(*string == *cmtchar) {
1832                            iscomment = 1;
1833                            break;
1834                    }
1835                    cmtchar++;
1836            }
1837    
1838            return(iscomment);
1839    }
1840    
1841    #if 0
1842    static void
1843    stats_print(rc_2pass2_t * rc)
1844    {
1845            int i;
1846            const char frame_type[4] = { 'i', 'p', 'b', 's'};
1847    
1848            for (i=0; i<rc->num_frames; i++) {
1849                    twopass_stat_t *s = &rc->stats[i];
1850                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- frame:%d type:%c quant:%d stats:%d scaled:%d desired:%d actual:%d overflow(%c):%.2f\n",
1851                                    i, frame_type[s->type-1], -1, s->length, s->scaled_length,
1852                                    s->desired_length, -1, frame_type[s->type-1], -1.0f);
1853            }
1854    }
1855    #endif
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