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Diff of /xvidcore/src/plugins/plugin_2pass2.c

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revision 1.1.2.11, Sat May 24 21:22:18 2003 UTC revision 1.3, Thu Jun 10 18:13:42 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    /* automtically 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    
 #define RAD2DEG 57.295779513082320876798154814105  
 #define DEG2RAD 0.017453292519943295769236907684886  
   
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
   
 /* Alt curve settings */  
 #define DEFAULT_USE_ALT_CURVE 0  
 #define DEFAULT_ALT_CURVE_HIGH_DIST 500  
 #define DEFAULT_ALT_CURVE_LOW_DIST 90  
 #define DEFAULT_ALT_CURVE_USE_AUTO 1  
 #define DEFAULT_ALT_CURVE_AUTO_STR 30  
 #define DEFAULT_ALT_CURVE_TYPE XVID_CURVE_LINEAR  
 #define DEFAULT_ALT_CURVE_MIN_REL_QUAL 50  
 #define DEFAULT_ALT_CURVE_USE_AUTO_BONUS_BIAS 1  
 #define DEFAULT_ALT_CURVE_BONUS_BIAS 50  
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 77  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             * constant statistical data
100             *--------------------------------*/
101    
102            /* Number of frames of the sequence */
103          int num_frames;          int num_frames;
104    
105            /* Number of Intra frames of the sequence */
106      int num_keyframes;      int num_keyframes;
     uint64_t target;    /* target filesize */  
107    
108      int count[3];   /* count of each frame types */          /* Target filesize to reach */
109      uint64_t tot_length[3];  /* total length of each frame types */          uint64_t target;
     double avg_length[3];   /* avg */  
     int min_length[3];  /* min frame length of each frame types */  
     uint64_t tot_scaled_length[3];  /* total scaled length of each frame type */  
     int max_length;     /* max frame size */  
   
     /* zone statistical data */  
     double avg_weight;  /* average weight */  
     int64_t tot_quant;   /* total length used by XVID_ZONE_QUANT zones */  
   
   
     double curve_comp_scale;  
     double movie_curve;  
   
         double alt_curve_low;  
         double alt_curve_high;  
         double alt_curve_low_diff;  
         double alt_curve_high_diff;  
     double alt_curve_curve_bias_bonus;  
         double alt_curve_mid_qual;  
         double alt_curve_qual_dev;  
110    
111      /* dynamic */          /* Count of each frame types */
112            int count[3];
113    
114            /* Total length of each frame types (1st pass) */
115            uint64_t tot_length[3];
116            uint64_t tot_invariant[3];
117    
118            /* Average length of each frame types (used first for 1st pass data and
119             * then for scaled averages */
120            double avg_length[3];
121    
122            /* Minimum frame length allowed for each frame type */
123            int min_length[3];
124    
125            /* Total bytes per frame type once the curve has been scaled
126             * NB: advanced parameters do not change this value. This field
127             *     represents the total scaled w/o any advanced settings */
128            uint64_t tot_scaled_length[3];
129    
130            /* Maximum observed frame size observed during the first pass, the RC
131             * will try tp force all frame sizes in the second pass to be under that
132             * limit */
133            int max_length;
134    
135            /*----------------------------------
136             * Zones statistical data
137             *--------------------------------*/
138    
139            /* Total length used by XVID_ZONE_QUANT zones */
140            uint64_t tot_quant;
141            uint64_t tot_quant_invariant;
142    
143            /* Holds the total amount of frame bytes, zone weighted (only scalable
144             * part of frame bytes) */
145            uint64_t tot_weighted;
146    
147            /*----------------------------------
148             * Advanced settings helper ratios
149             *--------------------------------*/
150    
151            /* This the ratio that has to be applied to all p/b frames in order
152             * to reserve/retrieve bits for/from keyframe boosting and consecutive
153             * keyframe penalty */
154            double pb_iboost_tax_ratio;
155    
156            /* This the ratio to apply to all b/p frames in order to respect the
157             * assymetric curve compression while respecting a target filesize
158             * NB: The assymetric delta gain has to be computed before this ratio
159             *     is applied, and then the delta is added to the scaled size */
160            double assymetric_tax_ratio;
161    
162            /*----------------------------------
163             * Data from the stats file kept
164             * into RAM for easy access
165             *--------------------------------*/
166    
167            /* Array of keyframe locations
168             * eg: rc->keyframe_locations[100] returns the frame number of the 100th
169             *     keyframe */
170      int * keyframe_locations;      int * keyframe_locations;
     stat_t * stats;  
171    
172      double pquant_error[32];          /* Index of the last keyframe used in the keyframe_location */
173      double bquant_error[32];          int KF_idx;
174      int quant_count[32];  
175            /* Array of all 1st pass data file -- see the twopass_stat_t structure
176             * definition for more details */
177            twopass_stat_t * stats;
178    
179            /*----------------------------------
180             * Hysteresis helpers
181             *--------------------------------*/
182    
183            /* This field holds the int2float conversion errors of each quant per
184             * frame type, this allow the RC to keep track of rouding error and thus
185             * increase or decrease the chosen quant according to this residue */
186            double quant_error[3][32];
187    
188            /* This fields stores the count of each quant usage per frame type
189             * No real role but for debugging */
190            int quant_count[3][32];
191    
192            /* Last valid quantizer used per frame type, it allows quantizer
193             * increament/decreament limitation in order to avoid big image quality
194             * "jumps" */
195      int last_quant[3];      int last_quant[3];
196    
197      double curve_comp_error;          /*----------------------------------
198      int overflow;           * Overflow control
199      int KFoverflow;           *--------------------------------*/
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 155  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 178  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 201  Line 292 
292    
293      rc->param = *param;      rc->param = *param;
294    
295            /* Initialize all defaults */
296  #define _INIT(a, b) if((a) <= 0) (a) = (b)  #define _INIT(a, b) if((a) <= 0) (a) = (b)
297      /* Let's set our defaults if needed */      /* Let's set our defaults if needed */
298          _INIT(rc->param.keyframe_boost, DEFAULT_KEYFRAME_BOOST);          _INIT(rc->param.keyframe_boost, DEFAULT_KEYFRAME_BOOST);
299          _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);  
300      _INIT(rc->param.curve_compression_high, DEFAULT_CURVE_COMPRESSION_HIGH);      _INIT(rc->param.curve_compression_high, DEFAULT_CURVE_COMPRESSION_HIGH);
301      _INIT(rc->param.curve_compression_low, DEFAULT_CURVE_COMPRESSION_LOW);      _INIT(rc->param.curve_compression_low, DEFAULT_CURVE_COMPRESSION_LOW);
302      _INIT(rc->param.max_overflow_improvement, DEFAULT_MAX_OVERFLOW_IMPROVEMENT);      _INIT(rc->param.max_overflow_improvement, DEFAULT_MAX_OVERFLOW_IMPROVEMENT);
303      _INIT(rc->param.max_overflow_degradation,  DEFAULT_MAX_OVERFLOW_DEGRADATION);      _INIT(rc->param.max_overflow_degradation,  DEFAULT_MAX_OVERFLOW_DEGRADATION);
304    
     /* Alt curve settings */  
         _INIT(rc->param.use_alt_curve, DEFAULT_USE_ALT_CURVE);  
     _INIT(rc->param.alt_curve_high_dist, DEFAULT_ALT_CURVE_HIGH_DIST);  
     _INIT(rc->param.alt_curve_low_dist, DEFAULT_ALT_CURVE_LOW_DIST);  
     _INIT(rc->param.alt_curve_use_auto, DEFAULT_ALT_CURVE_USE_AUTO);  
     _INIT(rc->param.alt_curve_auto_str, DEFAULT_ALT_CURVE_AUTO_STR);  
     _INIT(rc->param.alt_curve_type, DEFAULT_ALT_CURVE_TYPE);  
     _INIT(rc->param.alt_curve_min_rel_qual, DEFAULT_ALT_CURVE_MIN_REL_QUAL);  
     _INIT(rc->param.alt_curve_use_auto_bonus_bias, DEFAULT_ALT_CURVE_USE_AUTO_BONUS_BIAS);  
     _INIT(rc->param.alt_curve_bonus_bias, DEFAULT_ALT_CURVE_BONUS_BIAS);  
   
305      /* Keyframe settings */      /* Keyframe settings */
         _INIT(rc->param.kftreshold, DEFAULT_KFTRESHOLD);  
306      _INIT(rc->param.kfreduction, DEFAULT_KFREDUCTION);      _INIT(rc->param.kfreduction, DEFAULT_KFREDUCTION);
307      _INIT(rc->param.min_key_interval, DEFAULT_MIN_KEY_INTERVAL);          _INIT(rc->param.kfthreshold, DEFAULT_KFTHRESHOLD);
308  #undef _INIT  #undef _INIT
309    
310          /* Count frames in the stats file */          /* Initialize some stuff to zero */
311      if (!det_stats_length(rc, param->filename)){          for(i=0; i<3; i++) {
312          DPRINTF(XVID_DEBUG_RC,"fopen %s failed\n", param->filename);                  int j;
313                    for (j=0; j<32; j++) {
314                            rc->quant_error[i][j] = 0;
315                            rc->quant_count[i][j] = 0;
316                    }
317            }
318    
319            for (i=0; i<3; i++) rc->last_quant[i] = 0;
320    
321            rc->fq_error = 0;
322            rc->min_quant = 1;
323    
324            /* Count frames (and intra frames) in the stats file, store the result into
325             * the rc structure */
326            if (statsfile_count_frames(rc, param->filename) == -1) {
327                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- ERROR: fopen %s failed\n", param->filename);
328          free(rc);          free(rc);
329          return XVID_ERR_FAIL;                  return(XVID_ERR_FAIL);
330      }      }
331    
332      /* Allocate the stats' memory */      /* Allocate the stats' memory */
333          if ((rc->stats = malloc(rc->num_frames * sizeof(stat_t))) == NULL) {          if ((rc->stats = malloc(rc->num_frames * sizeof(twopass_stat_t))) == NULL) {
334          free(rc);          free(rc);
335          return XVID_ERR_MEMORY;                  return(XVID_ERR_MEMORY);
336      }      }
337    
338      /*          /* Allocate keyframes location's memory
339           * Allocate keyframes location's memory           * PS: see comment in pre_process0 for the +1 location requirement */
340           * PS: see comment in pre_process0 for the +1 location requirement          rc->keyframe_locations = malloc((rc->num_keyframes + 1) * sizeof(int));
341           */          if (rc->keyframe_locations == NULL) {
     if ((rc->keyframe_locations = malloc((rc->num_keyframes + 1) * sizeof(int))) == NULL) {  
342          free(rc->stats);          free(rc->stats);
343          free(rc);          free(rc);
344          return XVID_ERR_MEMORY;                  return(XVID_ERR_MEMORY);
345      }      }
346    
347      if (!load_stats(rc, param->filename)) {          /* Load the first pass stats */
348          DPRINTF(XVID_DEBUG_RC,"fopen %s failed\n", param->filename);          if (statsfile_load(rc, param->filename) == -1) {
349                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- ERROR: fopen %s failed\n", param->filename);
350          free(rc->keyframe_locations);          free(rc->keyframe_locations);
351          free(rc->stats);          free(rc->stats);
352          free(rc);          free(rc);
353          return XVID_ERR_FAIL;          return XVID_ERR_FAIL;
354      }      }
355    
356      /* pre-process our stats */          /* Compute the target filesize */
357            if (rc->param.bitrate<0) {
358          if (rc->num_frames  < create->fbase/create->fincr) {                  /* if negative, bitrate equals the target (in kbytes) */
359                  rc->target = rc->param.bitrate / 8;     /* one second */                  rc->target = ((uint64_t)(-rc->param.bitrate)) * 1024;
360            } else if (rc->num_frames  < create->fbase/create->fincr) {
361                    /* Source sequence is less than 1s long, we do as if it was 1s long */
362                    rc->target = rc->param.bitrate / 8;
363          } else {          } else {
364                    /* Target filesize = bitrate/8 * numframes / framerate */
365                  rc->target =                  rc->target =
366                          ((uint64_t)rc->param.bitrate * (uint64_t)rc->num_frames * (uint64_t)create->fincr) / \                          ((uint64_t)rc->param.bitrate * (uint64_t)rc->num_frames * \
367                             (uint64_t)create->fincr) / \
368                          ((uint64_t)create->fbase * 8);                          ((uint64_t)create->fbase * 8);
369          }          }
370    
371      DPRINTF(XVID_DEBUG_RC, "Number of frames: %d\n", rc->num_frames);          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Frame rate: %d/%d (%ffps)\n",
372          DPRINTF(XVID_DEBUG_RC, "Frame rate: %d/%d\n", create->fbase, create->fincr);                          create->fbase, create->fincr,
373          DPRINTF(XVID_DEBUG_RC, "Target bitrate: %ld\n", rc->param.bitrate);                          (double)create->fbase/(double)create->fincr);
374          DPRINTF(XVID_DEBUG_RC, "Target filesize: %lld\n", rc->target);          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Number of frames: %d\n", rc->num_frames);
375            if(rc->param.bitrate>=0)
376                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Target bitrate: %ld\n", rc->param.bitrate);
377            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Target filesize: %lld\n", rc->target);
378    
379          /* Compensate the mean frame overhead caused by the container */          /* Compensate the average frame overhead caused by the container */
380          rc->target -= rc->num_frames*rc->param.container_frame_overhead;          rc->target -= rc->num_frames*rc->param.container_frame_overhead;
381          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);
382          DPRINTF(XVID_DEBUG_RC, "Target filesize (after container compensation): %lld\n", rc->target);          if(rc->param.container_frame_overhead)
383                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- New target filesize after container compensation: %lld\n", rc->target);
         pre_process0(rc);  
384    
385            /* When bitrate is not given it means it has been scaled by an external
386             * application */
387          if (rc->param.bitrate) {          if (rc->param.bitrate) {
388                    /* Apply zone settings
389                     * - set rc->tot_quant which represents the total num of bytes spent in
390                     *   fixed quant zones
391                     * - set rc->tot_weighted which represents the total amount of bytes
392                     *   spent in normal or weighted zones in first pass (normal zones can
393                     *   be considered weight=1)
394                     * - set rc->tot_quant_invariant which represents the total num of bytes
395                     *   spent in fixed quant zones for headers */
396          zone_process(rc, create);          zone_process(rc, create);
                 internal_scale(rc);  
397      }else{      }else{
398          /* external scaler: ignore zone */                  /* External scaling -- zones are ignored */
399          for (i=0;i<rc->num_frames;i++) {          for (i=0;i<rc->num_frames;i++) {
400              rc->stats[i].zone_mode = XVID_ZONE_WEIGHT;              rc->stats[i].zone_mode = XVID_ZONE_WEIGHT;
401              rc->stats[i].weight = 1.0;              rc->stats[i].weight = 1.0;
402          }          }
         rc->avg_weight = 1.0;  
403          rc->tot_quant = 0;          rc->tot_quant = 0;
404      }      }
         pre_process1(rc);  
405    
406      for (i=0; i<32;i++) {          /* Gathers some information about first pass stats:
407          rc->pquant_error[i] = 0;           *  - finds the minimum frame length for each frame type during 1st pass.
408          rc->bquant_error[i] = 0;           *     rc->min_size[]
409          rc->quant_count[i] = 0;           *  - determines the maximum frame length observed (no frame type distinction).
410             *     rc->max_size
411             *  - count how many times each frame type has been used.
412             *     rc->count[]
413             *  - total bytes used per frame type
414             *     rc->tot_length[]
415             *  - total bytes considered invariant between the 2 passes
416             *  - store keyframe location
417             *     rc->keyframe_locations[]
418             */
419            first_pass_stats_prepare_data(rc);
420    
421            /* If we have a user bitrate, it means it's an internal curve scaling */
422            if (rc->param.bitrate) {
423                    /* Perform internal curve scaling */
424                    first_pass_scale_curve_internal(rc);
425      }      }
426    
427      rc->fq_error = 0;          /* Apply advanced curve options, and compute some parameters in order to
428             * shape the curve in the BEFORE/AFTER pair of functions */
429            scaled_curve_apply_advanced_parameters(rc);
430    
431    /* Check curve for VBV compliancy and rescale if necessary */
432    
433    #ifdef VBV_FORCE
434      if (rc->param.vbv_size==0)
435      {
436        rc->param.vbv_size      =  3145728;
437        rc->param.vbv_initial   =  2359296;
438        rc->param.vbv_maxrate  =  4000000;
439        rc->param.vbv_peakrate = 10000000;
440      }
441    #endif
442    
443      if (rc->param.vbv_size>0)    /* vbv_size==0 switches VBV check off */
444      {
445        const double fps = (double)create->fbase/(double)create->fincr;
446        int status = check_curve_for_vbv_compliancy(rc, fps);
447    #ifdef VBV_DEBUG
448        if (status)
449          fprintf(stderr,"underflow detected\n Scaling Curve for compliancy... ");
450    #endif
451    
452            status = scale_curve_for_vbv_compliancy(rc, fps);
453    
454    #ifdef VBV_DEBUG
455          if (status==0)
456            fprintf(stderr,"done.\n");
457          else
458            fprintf(stderr,"impossible.\n");
459    #endif
460      }
461      *handle = rc;      *handle = rc;
462          return(0);          return(0);
463  }  }
# Line 313  Line 468 
468  static int  static int
469  rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy)  rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy)
470  {  {
471            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- target_total:%lld desired_total:%.2f (%.2f%%) actual_total:%.2f (%.2f%%)\n",
472                            rc->target,
473                            rc->desired_total,
474                            100*rc->desired_total/(double)rc->target,
475                            rc->real_total,
476                            100*rc->real_total/(double)rc->target);
477    
478      free(rc->keyframe_locations);      free(rc->keyframe_locations);
479      free(rc->stats);      free(rc->stats);
480          free(rc);          free(rc);
# Line 325  Line 487 
487  static int  static int
488  rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)  rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)
489  {  {
490      stat_t * s = &rc->stats[data->frame_num];          twopass_stat_t * s = &rc->stats[data->frame_num];
     int overflow;  
     int desired;  
491      double dbytes;      double dbytes;
492      double curve_temp;          double scaled_quant;
493            double overflow;
494      int capped_to_max_framesize = 0;      int capped_to_max_framesize = 0;
495    
496          /*          /* This function is quite long but easy to understand. In order to simplify
497           * 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.  
          */  
498    
499          /* First case: Another plugin has already set a quantizer */          /* First case: Another plugin has already set a quantizer */
500      if (data->quant > 0)      if (data->quant > 0)
501                  return(0);                  return(0);
502    
503          /* Second case: We are in a Quant zone */          /* Second case: insufficent stats data
504          if (s->zone_mode == XVID_ZONE_QUANT) {           * We can't guess much what we should do, let core decide all alone */
505            if (data->frame_num >= rc->num_frames) {
506                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- stats file too short (now processing frame %d)",
507                            data->frame_num);
508                    return(0);
509            }
510    
511            /* Third case: We are in a Quant zone
512             * Quant zones must just ensure we use the same settings as first pass
513             * So set the quantizer and the type */
514            if (s->zone_mode == XVID_ZONE_QUANT) {
515                    /* Quant stuff */
516                  rc->fq_error += s->weight;                  rc->fq_error += s->weight;
517                  data->quant = (int)rc->fq_error;                  data->quant = (int)rc->fq_error;
518                  rc->fq_error -= data->quant;                  rc->fq_error -= data->quant;
519    
520                    /* The type stuff */
521                    data->type = s->type;
522    
523                    /* The only required data for AFTER step is this one for the overflow
524                     * control */
525                  s->desired_length = s->length;                  s->desired_length = s->length;
526    
527                  return(0);                  return(0);
   
528          }          }
529    
         /* 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 :-)  
          */  
530    
531          /* XXX: why by 8 */          /*************************************************************************/
532          overflow = rc->overflow / 8;          /*************************************************************************/
533            /*************************************************************************/
534    
535          /*          /*-------------------------------------------------------------------------
536           * The rc->overflow field represents the overflow in current scene (between two           * Frame bit allocation first part
537           * IFrames) so we must not forget to reset it if we are entering a new scene           *
538           */           * First steps apply user settings, just like it is done in the theoritical
539          if (s->type == XVID_TYPE_IVOP) {           * scaled_curve_apply_advanced_parameters
540                  overflow = 0;           *-----------------------------------------------------------------------*/
         }  
541    
542          desired = s->scaled_length;          /* Set desired to what we are wanting to obtain for this frame */
543            dbytes = (double)s->scaled_length;
544    
545          dbytes = desired;          /* IFrame user settings*/
546          if (s->type == XVID_TYPE_IVOP) {          if (s->type == XVID_TYPE_IVOP) {
547                  dbytes += desired * rc->param.keyframe_boost / 100;                  /* Keyframe boosting -- All keyframes benefit from it */
548          }                  dbytes += dbytes*rc->param.keyframe_boost / 100;
         dbytes /= rc->movie_curve;  
549    
550          /*  #if 0 /* ToDo: decide how to apply kfthresholding */
551           * We are now entering in the hard part of the algo, it was first designed  #endif
          * to work with i/pframes only streams, so the way it computes things is  
          * adapted to pframes only. However we can use it if we just take care to  
          * 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];  
   
         /*  
          * Apply user's choosen Payback method. Payback helps bitrate to follow the  
          * 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);  
552          } else {          } else {
                 desired = (int)(rc->curve_comp_error * dbytes /  
                                                 rc->avg_length[XVID_TYPE_PVOP-1] / rc->param.bitrate_payback_delay);  
553    
554                  if (labs(desired) > fabs(rc->curve_comp_error)) {                  /* P/S/B frames must reserve some bits for iframe boosting */
555                          desired = (int)rc->curve_comp_error;                  dbytes *= rc->pb_iboost_tax_ratio;
                 }  
         }  
556    
557          rc->curve_comp_error -= desired;                  /* Apply assymetric curve compression */
558                    if (rc->param.curve_compression_high || rc->param.curve_compression_low) {
559          /*                          double assymetric_delta;
560           * Alt curve treatment is not that hard to understand though the formulas  
561           * seem to be huge. Alt treatment is basically a way to soft/harden the                          /* Compute the assymetric delta, this is computed before applying
562           * curve flux applying sine/linear/cosine ratios                           * the tax, as done in the pre_process function */
563           */                          if (dbytes > rc->avg_length[s->type-1])
564                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_high / 100.0;
565          /* XXX: warning */                          else
566          curve_temp = 0;                                  assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_low  / 100.0;
567    
568          if (rc->param.use_alt_curve) {                          /* Now we must apply the assymetric tax, else our curve compression
569                  if (s->type != XVID_TYPE_IVOP)  {                           * would not give a theoritical target size equal to what it is
570                          if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                           * expected */
571                                  if (dbytes >= rc->alt_curve_high) {                          dbytes *= rc->assymetric_tax_ratio;
572                                          curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev);  
573                                  } else {                          /* Now we can add the assymetric delta */
574                                          switch(rc->param.alt_curve_type) {                          dbytes += assymetric_delta;
                                         case XVID_CURVE_SINE :  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * sin(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_high_diff)));  
                                                 break;  
                                         case XVID_CURVE_LINEAR :  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) / rc->alt_curve_high_diff);  
                                                 break;  
                                         case XVID_CURVE_COSINE :  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_high_diff))));  
                                         }  
                                 }  
                         } else {  
                                 if (dbytes <= rc->alt_curve_low){  
                                         curve_temp = dbytes;  
                                 } else {  
                                         switch(rc->param.alt_curve_type) {  
                                         case XVID_CURVE_SINE :  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * sin(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_low_diff)));  
                                                 break;  
                                         case XVID_CURVE_LINEAR :  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) / rc->alt_curve_low_diff);  
                                                 break;  
                                         case XVID_CURVE_COSINE :  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual + rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_low_diff))));  
                                         }  
575                                  }                                  }
576                          }                          }
577    
578                          /*          /* That is what we would like to have -- Don't put that chunk after
579                           * End of code path for curve_temp, as told earlier, we are now           * overflow control, otherwise, overflow is counted twice and you obtain
580                           * obliged to scale the value to a bframe one using the inverse           * half sized bitrate sequences */
581                           * ratio applied earlier          s->desired_length  = (int)dbytes;
582                           */          rc->desired_total += dbytes;
                         if (s->type == XVID_TYPE_BVOP)  
                                 curve_temp *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
583    
584                          curve_temp = curve_temp * rc->curve_comp_scale + rc->alt_curve_curve_bias_bonus;          /*------------------------------------------------------------------------
585             * Frame bit allocation: overflow control part.
586             *
587             * Unlike the theoritical scaled_curve_apply_advanced_parameters, here
588             * it's real encoding and we need to make sure we don't go so far from
589             * what is our ideal scaled curve.
590             *-----------------------------------------------------------------------*/
591    
592            /* Compute the overflow we should compensate */
593            if (s->type != XVID_TYPE_IVOP || rc->overflow > 0) {
594                    double frametype_factor;
595                    double framesize_factor;
596    
597                          desired += ((int)curve_temp);                  /* Take only the desired part of overflow */
598                          rc->curve_comp_error += curve_temp - (int)curve_temp;                  overflow = rc->overflow;
                 } else {  
                         /*  
                          * End of code path for dbytes, as told earlier, we are now  
                          * obliged to scale the value to a bframe one using the inverse  
                          * ratio applied earlier  
                          */  
                         if (s->type == XVID_TYPE_BVOP)  
                                 dbytes *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
599    
600                          desired += ((int)dbytes);                  /* Factor that will take care to decrease the overflow applied
601                          rc->curve_comp_error += dbytes - (int)dbytes;                   * according to the importance of this frame type in term of
602                  }                   * overall size */
603                    frametype_factor  = rc->count[XVID_TYPE_IVOP-1]*rc->avg_length[XVID_TYPE_IVOP-1];
604                    frametype_factor += rc->count[XVID_TYPE_PVOP-1]*rc->avg_length[XVID_TYPE_PVOP-1];
605                    frametype_factor += rc->count[XVID_TYPE_BVOP-1]*rc->avg_length[XVID_TYPE_BVOP-1];
606                    frametype_factor /= rc->count[s->type-1]*rc->avg_length[s->type-1];
607                    frametype_factor  = 1/frametype_factor;
608    
609                    /* Factor that will take care not to compensate too much for this frame
610                     * size */
611                    framesize_factor  = dbytes;
612                    framesize_factor /= rc->avg_length[s->type-1];
613    
614          } else if ((rc->param.curve_compression_high + rc->param.curve_compression_low) &&      s->type != XVID_TYPE_IVOP) {                  /* Treat only the overflow part concerned by this frame type and size */
615                    overflow *= frametype_factor;
616    #if 0
617                    /* Leave this one alone, as it impacts badly on quality */
618                    overflow *= framesize_factor;
619    #endif
620    
621                  curve_temp = rc->curve_comp_scale;                  /* Apply the overflow strength imposed by the user */
622                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                  overflow *= (rc->param.overflow_control_strength/100.0f);
                         curve_temp *= ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_high / 100.0);  
623                  } else {                  } else {
624                          curve_temp *= ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_low / 100.0);                  /* no negative overflow applied in IFrames because:
625                     *  - their role is important as they're references for P/BFrames.
626                     *  - there aren't much in typical sequences, so if an IFrame overflows too
627                     *    much, this overflow may impact the next IFrame too much and generate
628                     *    a sequence of poor quality frames */
629                    overflow = 0;
630                  }                  }
631    
632                  /*          /* Make sure we are not trying to compensate more overflow than we even have */
633                   * End of code path for curve_temp, as told earlier, we are now          if (fabs(overflow) > fabs(rc->overflow))
634                   * obliged to scale the value to a bframe one using the inverse                  overflow = rc->overflow;
                  * ratio applied earlier  
                  */  
                 if (s->type == XVID_TYPE_BVOP)  
                         curve_temp *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
635    
636                  desired += (int)curve_temp;          /* Make sure the overflow doesn't make the frame size to get out of the range
637                  rc->curve_comp_error += curve_temp - (int)curve_temp;           * [-max_degradation..+max_improvment] */
638            if (overflow > dbytes*rc->param.max_overflow_improvement / 100) {
639                    if(overflow <= dbytes)
640                            dbytes += dbytes * rc->param.max_overflow_improvement / 100;
641                    else
642                            dbytes += overflow * rc->param.max_overflow_improvement / 100;
643            } else if (overflow < - dbytes * rc->param.max_overflow_degradation / 100) {
644                    dbytes -= dbytes * rc->param.max_overflow_degradation / 100;
645          } else {          } else {
646                  /*                  dbytes += overflow;
                  * End of code path for dbytes, as told earlier, we are now  
                  * obliged to scale the value to a bframe one using the inverse  
                  * ratio applied earlier  
                  */  
                 if (s->type == XVID_TYPE_BVOP)  
                         dbytes *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
   
                 desired += (int)dbytes;  
                 rc->curve_comp_error += dbytes - (int)dbytes;  
647          }          }
648    
649            /*-------------------------------------------------------------------------
650          /*           * Frame bit allocation last part:
651           * We can't do bigger frames than first pass, this would be stupid as first           *
652           * pass is quant=2 and that reaching quant=1 is not worth it. We would lose           * Cap frame length so we don't reach neither bigger frame sizes than first
653           * many bytes and we would not not gain much quality.           * pass nor smaller than the allowed minimum.
654           */           *-----------------------------------------------------------------------*/
655          if (desired > s->length) {  
656                  rc->curve_comp_error += desired - s->length;  #ifdef PASS_SMALLER
657                  desired = s->length;          if (dbytes > s->length) {
658          } else {                  dbytes = s->length;
                 if (desired < rc->min_length[s->type-1]) {  
                         if (s->type == XVID_TYPE_IVOP){  
                                 rc->curve_comp_error -= rc->min_length[XVID_TYPE_IVOP-1] - desired;  
                         }  
                         desired = rc->min_length[s->type-1];  
                 }  
659          }          }
660    #endif
661    
662          s->desired_length = desired;          /* Prevent stupid desired sizes under logical values */
663            if (dbytes < rc->min_length[s->type-1]) {
664                    dbytes = rc->min_length[s->type-1];
665          /* 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  */  
   
         if (s->type == XVID_TYPE_IVOP) {  
                 int KFdistance = rc->keyframe_locations[rc->KF_idx] - rc->keyframe_locations[rc->KF_idx - 1];  
   
                 if (KFdistance < rc->param.kftreshold) {  
   
                         KFdistance -= rc->param.min_key_interval;  
   
                         if (KFdistance >= 0) {  
                                 int KF_min_size;  
   
                                 KF_min_size = desired * (100 - rc->param.kfreduction) / 100;  
                                 if (KF_min_size < 1)  
                                         KF_min_size = 1;  
666    
667                                  desired = KF_min_size + (desired - KF_min_size) * KFdistance /          /*------------------------------------------------------------------------
668                                          (rc->param.kftreshold - rc->param.min_key_interval);           * Desired frame length <-> quantizer mapping
669             *-----------------------------------------------------------------------*/
670    
671                                  if (desired < 1)  #ifdef BQUANT_PRESCALE
672                                          desired = 1;          /* For bframes we prescale the quantizer to avoid too high quant scaling */
673                          }          if(s->type == XVID_TYPE_BVOP) {
                 }  
         }  
674    
675          overflow = (int)((double)overflow * desired / rc->avg_length[XVID_TYPE_PVOP-1]);                  twopass_stat_t *b_ref = s;
676    
677          /* Reign in overflow with huge frames */                  /* Find the reference frame */
678          if (labs(overflow) > labs(rc->overflow)) {                  while(b_ref != &rc->stats[0] && b_ref->type == XVID_TYPE_BVOP)
679                  overflow = rc->overflow;                          b_ref--;
680    
681                    /* Compute the original quant */
682                    s->quant  = 2*(100*s->quant - data->bquant_offset);
683                    s->quant += data->bquant_ratio - 1; /* to avoid rounding issues */
684                    s->quant  = s->quant/data->bquant_ratio - b_ref->quant;
685          }          }
686    #endif
687    
688          /* Make sure overflow doesn't run away */          /* Don't laugh at this very 'simple' quant<->size relationship, it
689          if (overflow > desired * rc->param.max_overflow_improvement / 100) {           * proves to be acurate enough for our algorithm */
690                  desired += (overflow <= desired) ? desired * rc->param.max_overflow_improvement / 100 :          scaled_quant = (double)s->quant*(double)s->length/(double)dbytes;
691                          overflow * rc->param.max_overflow_improvement / 100;  
692          } else if (overflow < desired * rc->param.max_overflow_degradation / -100){  #ifdef COMPENSATE_FORMULA
693                  desired += desired * rc->param.max_overflow_degradation / -100;          /* We know xvidcore will apply the bframe formula again, so we compensate
694          } else {           * it right now to make sure we would not apply it twice */
695                  desired += overflow;          if(s->type == XVID_TYPE_BVOP) {
         }  
696    
697          /* 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);  
         }  
698    
699          /* Make sure to not scale below the minimum framesize */                  /* Find the reference frame */
700          if (desired < rc->min_length[s->type-1]) {                  while(b_ref != &rc->stats[0] && b_ref->type == XVID_TYPE_BVOP)
701                  desired = rc->min_length[s->type-1];                          b_ref--;
702                  DPRINTF(XVID_DEBUG_RC,"[%i] Capped to minimum frame size\n",  
703                                  data->frame_num);                  /* Compute the quant it would be if the core did not apply the bframe
704                     * formula */
705                    scaled_quant  = 100*scaled_quant - data->bquant_offset;
706                    scaled_quant += data->bquant_ratio - 1; /* to avoid rouding issues */
707                    scaled_quant /= data->bquant_ratio;
708          }          }
709    #endif
710    
711          /*          /* Quantizer has been scaled using floating point operations/results, we
712           * Don't laugh at this very 'simple' quant<->filesize relationship, it           * must cast it to integer */
713           * proves to be acurate enough for our algorithm          data->quant = (int)scaled_quant;
          */  
         data->quant = s->quant*s->length/desired;  
714    
715          /* Let's clip the computed quantizer, if needed */          /* Let's clip the computed quantizer, if needed */
716          if (data->quant < 1) {          if (data->quant < 1) {
717                  data->quant = 1;                  data->quant = 1;
718          } else if (data->quant > 31) {          } else if (data->quant > 31) {
719                  data->quant = 31;                  data->quant = 31;
         } else if (s->type != XVID_TYPE_IVOP) {  
   
                 /*  
                  * The frame quantizer has not been clipped, this appear to be a good  
                  * computed quantizer, however past frames give us some info about how  
                  * this quantizer performs against the algo prevision. Let's use this  
                  * prevision to increase the quantizer when we observe a too big  
                  * accumulated error  
                  */  
                 if (s->type == XVID_TYPE_BVOP) {  
                         rc->bquant_error[data->quant] += ((double)(s->quant * s->length) / desired) - data->quant;  
   
                         if (rc->bquant_error[data->quant] >= 1.0) {  
                                 rc->bquant_error[data->quant] -= 1.0;  
                                 data->quant++;  
                         }  
720                  } else {                  } else {
                         rc->pquant_error[data->quant] += ((double)(s->quant * s->length) / desired) - data->quant;  
721    
722                          if (rc->pquant_error[data->quant] >= 1.0) {                  /* The frame quantizer has not been clipped, this appears to be a good
723                                  rc->pquant_error[data->quant] -= 1.0;                   * computed quantizer, do not loose quantizer decimal part that we
724                     * accumulate for later reuse when its sum represents a complete
725                     * unit. */
726                    rc->quant_error[s->type-1][data->quant] += scaled_quant - (double)data->quant;
727    
728                    if (rc->quant_error[s->type-1][data->quant] >= 1.0) {
729                            rc->quant_error[s->type-1][data->quant] -= 1.0;
730                                  data->quant++;                                  data->quant++;
731                          }                  } else if (rc->quant_error[s->type-1][data->quant] <= -1.0) {
732                            rc->quant_error[s->type-1][data->quant] += 1.0;
733                            data->quant--;
734                  }                  }
735          }          }
736    
737          /*          /* 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  
738           * possible +1 correction due to cumulated error. We can now safely clip           * possible +1 correction due to cumulated error. We can now safely clip
739           * the quantizer again with user's quant ranges. "Safely" means the Rate           * the quantizer again with user's quant ranges. "Safely" means the Rate
740           * Control could learn more about this quantizer, this knowledge is useful           * Control could learn more about this quantizer, this knowledge is useful
741           * 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,
742           * that's why we don't perform this clipping earlier.           * that's why we don't perform this clipping earlier. */
          */  
743          if (data->quant < data->min_quant[s->type-1]) {          if (data->quant < data->min_quant[s->type-1]) {
744                  data->quant = data->min_quant[s->type-1];                  data->quant = data->min_quant[s->type-1];
745          } else if (data->quant > data->max_quant[s->type-1]) {          } else if (data->quant > data->max_quant[s->type-1]) {
746                  data->quant = data->max_quant[s->type-1];                  data->quant = data->max_quant[s->type-1];
747          }          }
748    
749          /*          if (data->quant < rc->min_quant) data->quant = rc->min_quant;
750           * To avoid big quality jumps from frame to frame, we apply a "security"  
751            /* To avoid big quality jumps from frame to frame, we apply a "security"
752           * rule that makes |last_quant - new_quant| <= 2. This rule only applies           * rule that makes |last_quant - new_quant| <= 2. This rule only applies
753           * to predicted frames (P and B)           * to predicted frames (P and B) */
          */  
754          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) {
755    
756                  if (data->quant > rc->last_quant[s->type-1] + 2) {                  if (data->quant > rc->last_quant[s->type-1] + 2) {
757                          data->quant = rc->last_quant[s->type-1] + 2;                          data->quant = rc->last_quant[s->type-1] + 2;
758                          DPRINTF(XVID_DEBUG_RC,                          DPRINTF(XVID_DEBUG_RC,
759                                          "[%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",
760                                          data->frame_num);                                          data->frame_num);
761                  }                  }
762                  if (data->quant < rc->last_quant[s->type-1] - 2) {                  if (data->quant < rc->last_quant[s->type-1] - 2) {
763                          data->quant = rc->last_quant[s->type-1] - 2;                          data->quant = rc->last_quant[s->type-1] - 2;
764                          DPRINTF(XVID_DEBUG_RC,                          DPRINTF(XVID_DEBUG_RC,
765                                          "[%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",
766                                          data->frame_num);                                          data->frame_num);
767                  }                  }
768          }          }
769    
770          /*          /* We don't want to pollute the RC histerisis when our computed quant has
771           * We don't want to pollute the RC history results when our computed quant           * been computed from a capped frame size */
772           * has been computed from a capped frame size          if (capped_to_max_framesize == 0)
          */  
         if (capped_to_max_framesize == 0) {  
773                  rc->last_quant[s->type-1] = data->quant;                  rc->last_quant[s->type-1] = data->quant;
774          }  
775            /* Don't forget to force 1st pass frame type ;-) */
776            data->type = s->type;
777    
778          return 0;          return 0;
779  }  }
# Line 678  Line 784 
784  static int  static int
785  rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)  rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)
786  {  {
787      stat_t * s = &rc->stats[data->frame_num];          const char frame_type[4] = { 'i', 'p', 'b', 's'};
788            twopass_stat_t * s = &rc->stats[data->frame_num];
789    
790          /* Insufficent stats data */          /* Insufficent stats data */
791      if (data->frame_num >= rc->num_frames)      if (data->frame_num >= rc->num_frames)
792          return 0;          return 0;
793    
794      rc->quant_count[data->quant]++;          /* Update the quantizer counter */
795            rc->quant_count[s->type-1][data->quant]++;
796    
797            /* Update the frame type overflow */
798      if (data->type == XVID_TYPE_IVOP) {      if (data->type == XVID_TYPE_IVOP) {
799          int kfdiff = (rc->keyframe_locations[rc->KF_idx] -      rc->keyframe_locations[rc->KF_idx - 1]);                  int kfdiff = 0;
800    
801                    if(rc->KF_idx != rc->num_frames -1) {
802                            kfdiff  = rc->keyframe_locations[rc->KF_idx+1];
803                            kfdiff -= rc->keyframe_locations[rc->KF_idx];
804                    }
805    
806                    /* Flush Keyframe overflow accumulator */
807          rc->overflow += rc->KFoverflow;          rc->overflow += rc->KFoverflow;
808    
809                    /* Store the frame overflow to the keyframe accumulator */
810          rc->KFoverflow = s->desired_length - data->length;          rc->KFoverflow = s->desired_length - data->length;
811    
812          if (kfdiff > 1) {  // non-consecutive keyframes                  if (kfdiff > 1) {
813                            /* Non-consecutive keyframes case:
814                             * We can then divide this total keyframe overflow into equal parts
815                             * that we will distribute into regular overflow at each frame
816                             * between the sequence bounded by two IFrames */
817              rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);              rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);
818          }else{ // consecutive keyframes                  } else {
819                            /* Consecutive keyframes case:
820                             * Flush immediatly the keyframe overflow and reset keyframe
821                             * overflow */
822                          rc->overflow += rc->KFoverflow;                          rc->overflow += rc->KFoverflow;
823                          rc->KFoverflow = 0;                          rc->KFoverflow = 0;
824                          rc->KFoverflow_partial = 0;                          rc->KFoverflow_partial = 0;
825          }          }
826          rc->KF_idx++;          rc->KF_idx++;
827      } else {      } else {
828          // distribute part of the keyframe overflow                  /* Accumulate the frame overflow */
829          rc->overflow += s->desired_length - data->length + rc->KFoverflow_partial;                  rc->overflow += s->desired_length - data->length;
830    
831                    /* Distribute part of the keyframe overflow */
832                    rc->overflow += rc->KFoverflow_partial;
833    
834                    /* Don't forget to substract that same amount from the total keyframe
835                     * overflow */
836          rc->KFoverflow -= rc->KFoverflow_partial;          rc->KFoverflow -= rc->KFoverflow_partial;
837      }      }
838    
839          DPRINTF(XVID_DEBUG_RC, "[%i] quant:%i stats1:%i scaled:%i actual:%i overflow:%i\n",          rc->overflow += (s->error = s->desired_length - data->length);
840            rc->real_total += data->length;
841    
842            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",
843                          data->frame_num,                          data->frame_num,
844                            frame_type[data->type-1],
845                          data->quant,                          data->quant,
846                          s->length,                          s->length,
847                          s->scaled_length,                          s->scaled_length,
848                          data->length,                          s->desired_length,
849                            s->desired_length - s->error,
850                            -s->error,
851                          rc->overflow);                          rc->overflow);
852    
853      return(0);      return(0);
# Line 721  Line 857 
857   * Helper functions definition   * Helper functions definition
858   ****************************************************************************/   ****************************************************************************/
859    
860    /* Default buffer size for reading lines */
861  #define BUF_SZ   1024  #define BUF_SZ   1024
 #define MAX_COLS 5  
862    
863  /* open stats file, and count num frames */  /* Helper functions for reading/parsing the stats file */
864    static char *skipspaces(char *string);
865    static int iscomment(char *string);
866    static char *readline(FILE *f);
867    
868    /* This function counts the number of frame entries in the stats file
869     * It also counts the number of I Frames */
870  static int  static int
871  det_stats_length(rc_2pass2_t * rc, char * filename)  statsfile_count_frames(rc_2pass2_t * rc, char * filename)
872  {  {
873      FILE * f;      FILE * f;
874      int n, ignore;          char *line;
875      char type;          int lines;
876    
877      rc->num_frames = 0;      rc->num_frames = 0;
878      rc->num_keyframes = 0;      rc->num_keyframes = 0;
879    
880      if ((f = fopen(filename, "rt")) == NULL)          if ((f = fopen(filename, "rb")) == NULL)
881          return 0;                  return(-1);
882    
883      while((n = fscanf(f, "%c %d %d %d %d %d %d\n",          lines = 0;
884          &type, &ignore, &ignore, &ignore, &ignore, &ignore, &ignore)) != EOF) {          while ((line = readline(f)) != NULL) {
885          if (type == 'i') {  
886              rc->num_frames++;                  char *ptr;
887                    char type;
888                    int fields;
889    
890                    lines++;
891    
892                    /* We skip spaces */
893                    ptr = skipspaces(line);
894    
895                    /* Skip coment lines or empty lines */
896                    if(iscomment(ptr) || *ptr == '\0') {
897                            free(line);
898                            continue;
899                    }
900    
901                    /* Read the stat line from buffer */
902                    fields = sscanf(ptr, "%c", &type);
903    
904                    /* Valid stats files have at least 7 fields */
905                    if (fields == 1) {
906                            switch(type) {
907                            case 'i':
908                            case 'I':
909              rc->num_keyframes++;              rc->num_keyframes++;
910          }else if (type == 'p' || type == 'b' || type == 's') {                          case 'p':
911                            case 'P':
912                            case 'b':
913                            case 'B':
914                            case 's':
915                            case 'S':
916              rc->num_frames++;              rc->num_frames++;
917                                    break;
918                            default:
919                                    DPRINTF(XVID_DEBUG_RC,
920                                                    "[xvid rc] -- WARNING: L%d unknown frame type used (%c).\n",
921                                                    lines, type);
922          }          }
923                    } else {
924                                    DPRINTF(XVID_DEBUG_RC,
925                                                    "[xvid rc] -- WARNING: L%d misses some stat fields (%d).\n",
926                                                    lines, 7-fields);
927      }      }
928    
929                    /* Free the line buffer */
930                    free(line);
931            }
932    
933            /* We are done with the file */
934      fclose(f);      fclose(f);
935    
936      return 1;          return(0);
937  }  }
938    
939  /* open stats file(s) and read into rc->stats array */  /* open stats file(s) and read into rc->stats array */
   
940  static int  static int
941  load_stats(rc_2pass2_t *rc, char * filename)  statsfile_load(rc_2pass2_t *rc, char * filename)
942  {  {
943      FILE * f;      FILE * f;
944      int i, not_scaled;          int processed_entries;
   
945    
946      if ((f = fopen(filename, "rt"))==NULL)          /* Opens the file */
947          return 0;          if ((f = fopen(filename, "rb"))==NULL)
948                    return(-1);
949    
950      i = 0;          processed_entries = 0;
951          not_scaled = 0;          while(processed_entries < rc->num_frames) {
     while(i < rc->num_frames) {  
         stat_t * s = &rc->stats[i];  
         int n;  
952          char type;          char type;
953                    int fields;
954                    twopass_stat_t * s = &rc->stats[processed_entries];
955                    char *line, *ptr;
956    
957                  s->scaled_length = 0;                  /* Read the line from the file */
958          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((line = readline(f)) == NULL)
959          if (n == EOF) break;                          break;
960                  if (n < 7) {  
961                          not_scaled = 1;                  /* We skip spaces */
962                    ptr = skipspaces(line);
963    
964                    /* Skip comment lines or empty lines */
965                    if(iscomment(ptr) || *ptr == '\0') {
966                            free(line);
967                            continue;
968                  }                  }
969    
970          if (type == 'i') {                  /* Reset this field that is optional */
971                    s->scaled_length = 0;
972    
973                    /* Convert the fields */
974                    fields = sscanf(ptr,
975                                                    "%c %d %d %d %d %d %d %d\n",
976                                                    &type,
977                                                    &s->quant,
978                                                    &s->blks[0], &s->blks[1], &s->blks[2],
979                                                    &s->length, &s->invariant /* not really yet */,
980                                                    &s->scaled_length);
981    
982                    /* Free line buffer, we don't need it anymore */
983                    free(line);
984    
985                    /* Fail silently, this has probably been warned in
986                     * statsfile_count_frames */
987                    if(fields != 7 && fields != 8)
988                            continue;
989    
990                    /* Convert frame type and compute the invariant length part */
991                    switch(type) {
992                    case 'i':
993                    case 'I':
994              s->type = XVID_TYPE_IVOP;              s->type = XVID_TYPE_IVOP;
995          }else if (type == 'p' || type == 's') {                          s->invariant /= INVARIANT_HEADER_PART_IVOP;
996                            break;
997                    case 'p':
998                    case 'P':
999                    case 's':
1000                    case 'S':
1001              s->type = XVID_TYPE_PVOP;              s->type = XVID_TYPE_PVOP;
1002          }else if (type == 'b') {                          s->invariant /= INVARIANT_HEADER_PART_PVOP;
1003                            break;
1004                    case 'b':
1005                    case 'B':
1006              s->type = XVID_TYPE_BVOP;              s->type = XVID_TYPE_BVOP;
1007          }else{  /* unknown type */                          s->invariant /= INVARIANT_HEADER_PART_BVOP;
1008              DPRINTF(XVID_DEBUG_RC, "unknown stats frame type; assuming pvop\n");                          break;
1009              s->type = XVID_TYPE_PVOP;                  default:
1010                            /* Same as before, fail silently */
1011                            continue;
1012          }          }
1013    
1014          i++;                  /* Ok it seems it's been processed correctly */
1015                    processed_entries++;
1016      }      }
1017    
1018      rc->num_frames = i;          /* Close the file */
   
1019          fclose(f);          fclose(f);
1020    
1021      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);  
     }  
1022  }  }
 #endif  
1023    
1024  /* pre-process the statistics data  /* pre-process the statistics data
1025      - for each type, count, tot_length, min_length, max_length   * - for each type, count, tot_length, min_length, max_length
1026      - set keyframes_locations   * - set keyframes_locations, tot_prescaled */
 */  
   
1027  static void  static void
1028  pre_process0(rc_2pass2_t * rc)  first_pass_stats_prepare_data(rc_2pass2_t * rc)
1029  {  {
1030      int i,j;      int i,j;
1031    
1032            /* *rc fields initialization
1033             * NB: INT_MAX and INT_MIN are used in order to be immediately replaced
1034             *     with real values of the 1pass */
1035      for (i=0; i<3; i++) {      for (i=0; i<3; i++) {
1036          rc->count[i]=0;          rc->count[i]=0;
1037          rc->tot_length[i] = 0;          rc->tot_length[i] = 0;
1038          rc->last_quant[i] = 0;                  rc->tot_invariant[i] = 0;
1039                  rc->min_length[i] = INT_MAX;                  rc->min_length[i] = INT_MAX;
1040      }      }
1041    
1042          rc->max_length = INT_MIN;          rc->max_length = INT_MIN;
1043            rc->tot_weighted = 0;
1044    
1045            /* Loop through all frames and find/compute all the stuff this function
1046             * is supposed to do */
1047      for (i=j=0; i<rc->num_frames; i++) {      for (i=j=0; i<rc->num_frames; i++) {
1048          stat_t * s = &rc->stats[i];                  twopass_stat_t * s = &rc->stats[i];
1049    
1050          rc->count[s->type-1]++;          rc->count[s->type-1]++;
1051          rc->tot_length[s->type-1] += s->length;          rc->tot_length[s->type-1] += s->length;
1052                    rc->tot_invariant[s->type-1] += s->invariant;
1053                    if (s->zone_mode != XVID_ZONE_QUANT)
1054                            rc->tot_weighted += (int)(s->weight*(s->length - s->invariant));
1055    
1056          if (s->length < rc->min_length[s->type-1]) {          if (s->length < rc->min_length[s->type-1]) {
1057              rc->min_length[s->type-1] = s->length;              rc->min_length[s->type-1] = s->length;
# Line 851  Line 1067 
1067          }          }
1068      }      }
1069    
1070          /*          /* NB:
          * Nota Bene:  
1071           * The "per sequence" overflow system considers a natural sequence to be           * The "per sequence" overflow system considers a natural sequence to be
1072           * 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
1073           * 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
1074           * frame to appear in the keyframe locations array.           * frame to appear in the keyframe locations array. */
          */  
1075      rc->keyframe_locations[j] = i;      rc->keyframe_locations[j] = i;
1076    
1077          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]);
1078          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]);
1079          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]);
1080  }  }
1081    
1082  /* calculate zone weight "center" */  /* calculate zone weight "center" */
   
1083  static void  static void
1084  zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)  zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)
1085  {  {
1086      int i,j;      int i,j;
1087      int n = 0;      int n = 0;
1088    
     rc->avg_weight = 0.0;  
1089      rc->tot_quant = 0;      rc->tot_quant = 0;
1090            rc->tot_quant_invariant = 0;
1091    
1092      if (create->num_zones == 0) {      if (create->num_zones == 0) {
1093          for (j = 0; j < rc->num_frames; j++) {          for (j = 0; j < rc->num_frames; j++) {
1094              rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;              rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1095              rc->stats[j].weight = 1.0;              rc->stats[j].weight = 1.0;
1096          }          }
         rc->avg_weight += rc->num_frames * 1.0;  
1097          n += rc->num_frames;          n += rc->num_frames;
1098      }      }
1099    
# Line 891  Line 1102 
1102    
1103          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;
1104    
1105                    /* Zero weight make no sense */
1106                    if (create->zones[i].increment == 0) create->zones[i].increment = 1;
1107                    /* And obviously an undetermined infinite makes even less sense */
1108                    if (create->zones[i].base == 0) create->zones[i].base = 1;
1109    
1110          if (i==0 && create->zones[i].frame > 0) {          if (i==0 && create->zones[i].frame > 0) {
1111              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++) {
1112                  rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;                  rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1113                  rc->stats[j].weight = 1.0;                  rc->stats[j].weight = 1.0;
1114              }              }
             rc->avg_weight += create->zones[i].frame * 1.0;  
1115              n += create->zones[i].frame;              n += create->zones[i].frame;
1116          }          }
1117    
# Line 906  Line 1121 
1121                  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;
1122              }              }
1123              next -= create->zones[i].frame;              next -= create->zones[i].frame;
             rc->avg_weight += (double)(next * create->zones[i].increment) / (double)create->zones[i].base;  
1124              n += next;              n += next;
1125          }else{  // XVID_ZONE_QUANT                  } else{  /* XVID_ZONE_QUANT */
1126              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++ ) {
1127                  rc->stats[j].zone_mode = XVID_ZONE_QUANT;                  rc->stats[j].zone_mode = XVID_ZONE_QUANT;
1128                  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;
1129                  rc->tot_quant += rc->stats[j].length;                  rc->tot_quant += rc->stats[j].length;
1130                                    rc->tot_quant_invariant += rc->stats[j].invariant;
1131              }              }
1132          }          }
1133      }      }
     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);  
1134  }  }
1135    
1136    
1137  /* scale the curve */  /* scale the curve */
   
1138  static void  static void
1139  internal_scale(rc_2pass2_t *rc)  first_pass_scale_curve_internal(rc_2pass2_t *rc)
1140  {  {
1141          int64_t target  = rc->target - rc->tot_quant;          int64_t target;
1142          int64_t pass1_length = rc->tot_length[0] + rc->tot_length[1] + rc->tot_length[2] - rc->tot_quant;          int64_t total_invariant;
1143          double scaler;          double scaler;
1144          int i;          int i, num_MBs;
1145    
1146            /* We only scale texture data ! */
1147            total_invariant  = rc->tot_invariant[XVID_TYPE_IVOP-1];
1148            total_invariant += rc->tot_invariant[XVID_TYPE_PVOP-1];
1149            total_invariant += rc->tot_invariant[XVID_TYPE_BVOP-1];
1150            /* don't forget to substract header bytes used in quant zones, otherwise we
1151             * counting them twice */
1152            total_invariant -= rc->tot_quant_invariant;
1153    
1154            /* We remove the bytes used by the fixed quantizer zones during first pass
1155             * with the same quants, so we know very precisely how much that
1156             * represents */
1157            target  = rc->target;
1158            target -= rc->tot_quant;
1159    
1160          /* Let's compute a linear scaler in order to perform curve scaling */          /* Let's compute a linear scaler in order to perform curve scaling */
1161          scaler = (double)target / (double)pass1_length;          scaler = (double)(target - total_invariant) / (double)(rc->tot_weighted);
1162    
1163          if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {  #ifdef SMART_OVERFLOW_SETTING
1164                  DPRINTF(XVID_DEBUG_RC, "WARNING: Undersize detected\n");          if (scaler > 0.9) {
1165          scaler = 1.0;                  rc->param.max_overflow_degradation *= 5;
1166                    rc->param.max_overflow_improvement *= 5;
1167                    rc->param.overflow_control_strength *= 3;
1168            } else if (scaler > 0.6) {
1169                    rc->param.max_overflow_degradation *= 2;
1170                    rc->param.max_overflow_improvement *= 2;
1171                    rc->param.overflow_control_strength *= 2;
1172            } else {
1173                    rc->min_quant = 2;
1174          }          }
1175    #endif
1176    
1177      DPRINTF(XVID_DEBUG_RC,          /* Compute min frame lengths (for each frame type) according to the number
1178                          "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
1179                          (int)target, (int)pass1_length, scaler);           * number of MBs.
1180             *
1181             * We compare these hardcoded values with observed values in first pass
1182             * (determined in pre_process0).Then we keep the real minimum. */
1183    
1184          /*          /* Number of MBs */
1185           * Perform an initial scale pass.          num_MBs  = rc->stats[0].blks[0];
1186            num_MBs += rc->stats[0].blks[1];
1187            num_MBs += rc->stats[0].blks[2];
1188    
1189            /* Minimum for I frames */
1190            if(rc->min_length[XVID_TYPE_IVOP-1] > ((num_MBs*22) + 240) / 8)
1191                    rc->min_length[XVID_TYPE_IVOP-1] = ((num_MBs*22) + 240) / 8;
1192    
1193            /* Minimum for P/S frames */
1194            if(rc->min_length[XVID_TYPE_PVOP-1] > ((num_MBs) + 88)  / 8)
1195                    rc->min_length[XVID_TYPE_PVOP-1] = ((num_MBs) + 88)  / 8;
1196    
1197            /* Minimum for B frames */
1198            if(rc->min_length[XVID_TYPE_BVOP-1] > 8)
1199                    rc->min_length[XVID_TYPE_BVOP-1] = 8;
1200    
1201            /* Perform an initial scale pass.
1202             *
1203           * If a frame size is scaled underneath our hardcoded minimums, then we           * If a frame size is scaled underneath our hardcoded minimums, then we
1204           * force the frame size to the minimum, and deduct the original & scaled           * force the frame size to the minimum, and deduct the original & scaled
1205           * frame length from the original and target total lengths           * frame length from the original and target total lengths */
          */  
   
1206          for (i=0; i<rc->num_frames; i++) {          for (i=0; i<rc->num_frames; i++) {
1207                  stat_t * s = &rc->stats[i];                  twopass_stat_t * s = &rc->stats[i];
                 int min_size[3];  
1208                  int len;                  int len;
1209    
1210                  /* Compute min frame lengths (oe for each frame type) */                  /* No need to scale frame length for which a specific quantizer is
1211                  min_size[0] = ((s->blks[0]*22) + 240) / 8;                   * specified thanks to zones */
                 min_size[1] = (s->blks[0] + 88) / 8;  
                 min_size[2] = 8;  
   
1212          if (s->zone_mode == XVID_ZONE_QUANT) {          if (s->zone_mode == XVID_ZONE_QUANT) {
1213              s->scaled_length = s->length;              s->scaled_length = s->length;
1214                          continue;                          continue;
1215                  }                  }
1216    
1217                  /* Compute teh scaled length */                  /* Compute the scaled length -- only non invariant data length is scaled */
1218                  len = (int)((double)s->length * scaler * s->weight / rc->avg_weight);                  len = s->invariant + (int)((double)(s->length-s->invariant) * scaler * s->weight);
1219    
1220                  /* Compare with the computed minimum */                  /* Compare with the computed minimum */
1221                  if (len < min_size[s->type-1]) {                  if (len < rc->min_length[s->type-1]) {
1222                          /* force frame size to our computed minimum */                          /* This is a 'forced size' frame, set its frame size to the
1223                          s->scaled_length = min_size[s->type-1];                           * computed minimum */
1224                            s->scaled_length = rc->min_length[s->type-1];
1225    
1226                            /* Remove both scaled and original size from their respective
1227                             * total counters, as we prepare a second pass for 'regular'
1228                             * frames */
1229                          target -= s->scaled_length;                          target -= s->scaled_length;
                         pass1_length -= s->length;  
1230                  } else {                  } else {
1231                          /* Do nothing for now, we'll scale this later */                          /* Do nothing for now, we'll scale this later */
1232                          s->scaled_length = 0;                          s->scaled_length = 0;
1233                  }                  }
   
1234          }          }
1235    
1236          /* Correct the scaler for all non forced frames */          /* The first pass on data substracted all 'forced size' frames from the
1237          scaler = (double)target / (double)pass1_length;           * total counters. Now, it's possible to scale the 'regular' frames. */
1238    
1239          /* Detect undersizing */          /* Scaling factor for 'regular' frames */
1240      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);  
1241    
1242          /* Do another pass with the new scaler */          /* Do another pass with the new scaler */
1243          for (i=0; i<rc->num_frames; i++) {          for (i=0; i<rc->num_frames; i++) {
1244                  stat_t * s = &rc->stats[i];                  twopass_stat_t * s = &rc->stats[i];
1245    
1246                  /* Ignore frame with forced frame sizes */                  /* Ignore frame with forced frame sizes */
1247                  if (s->scaled_length == 0)                  if (s->scaled_length == 0)
1248                          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);
1249          }          }
1250    
1251            /* Job done */
1252            return;
1253  }  }
1254    
1255    /* Apply all user settings to the scaled curve
1256     * This implies:
1257     *   keyframe boosting
1258     *   high/low compression */
1259  static void  static void
1260  pre_process1(rc_2pass2_t * rc)  scaled_curve_apply_advanced_parameters(rc_2pass2_t * rc)
1261  {  {
1262      int i;      int i;
1263      double total1, total2;          int64_t ivop_boost_total;
     uint64_t ivop_boost_total;  
1264    
1265      ivop_boost_total = 0;          /* Reset the rate controller (per frame type) total byte counters */
1266      rc->curve_comp_error = 0;          for (i=0; i<3; i++) rc->tot_scaled_length[i] = 0;
1267    
1268      for (i=0; i<3; i++) {          /* Compute total bytes for each frame type */
1269          rc->tot_scaled_length[i] = 0;          for (i=0; i<rc->num_frames;i++) {
1270                    twopass_stat_t *s = &rc->stats[i];
1271                    rc->tot_scaled_length[s->type-1] += s->scaled_length;
1272      }      }
1273    
1274            /* First we compute the total amount of bits needed, as being described by
1275             * the scaled distribution. During this pass over the complete stats data,
1276             * we see how much bits two user settings will get/give from/to p&b frames:
1277             *  - keyframe boosting
1278             *  - keyframe distance penalty */
1279            rc->KF_idx = 0;
1280            ivop_boost_total = 0;
1281      for (i=0; i<rc->num_frames; i++) {      for (i=0; i<rc->num_frames; i++) {
1282          stat_t * s = &rc->stats[i];                  twopass_stat_t * s = &rc->stats[i];
   
         rc->tot_scaled_length[s->type-1] += s->scaled_length;  
1283    
1284                    /* Some more work is needed for I frames */
1285          if (s->type == XVID_TYPE_IVOP) {          if (s->type == XVID_TYPE_IVOP) {
1286              ivop_boost_total += s->scaled_length * rc->param.keyframe_boost / 100;                          int ivop_boost;
1287    
1288                            /* Accumulate bytes needed for keyframe boosting */
1289                            ivop_boost = s->scaled_length*rc->param.keyframe_boost/100;
1290    
1291    #if 0 /* ToDo: decide how to apply kfthresholding */
1292    #endif
1293                            /* If the frame size drops under the minimum length, then cap ivop_boost */
1294                            if (ivop_boost + s->scaled_length < rc->min_length[XVID_TYPE_IVOP-1])
1295                                    ivop_boost = rc->min_length[XVID_TYPE_IVOP-1] - s->scaled_length;
1296    
1297                            /* Accumulate the ivop boost */
1298                            ivop_boost_total += ivop_boost;
1299    
1300                            /* Don't forget to update the keyframe index */
1301                            rc->KF_idx++;
1302          }          }
1303      }      }
1304    
1305      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
1306                                          (rc->tot_scaled_length[XVID_TYPE_PVOP-1] + rc->tot_scaled_length[XVID_TYPE_BVOP-1]));           *
1307             * This ratio has to be applied to p/b/s frames in order to reserve
1308             * additional bits for keyframes (keyframe boosting) or if too much
1309             * keyframe distance is applied, bits retrieved from the keyframes.
1310             *
1311             * ie pb_length *= rc->pb_iboost_tax_ratio;
1312             *
1313             *    gives the ideal length of a p/b frame */
1314    
1315            /* Compute the total length of p/b/s frames (temporary storage into
1316             * movie_curve) */
1317            rc->pb_iboost_tax_ratio  = (double)rc->tot_scaled_length[XVID_TYPE_PVOP-1];
1318            rc->pb_iboost_tax_ratio += (double)rc->tot_scaled_length[XVID_TYPE_BVOP-1];
1319    
1320            /* Compute the ratio described above
1321             *     taxed_total = sum(0, n, tax*scaled_length)
1322             * <=> taxed_total = tax.sum(0, n, scaled_length)
1323             * <=> tax = taxed_total / original_total */
1324            rc->pb_iboost_tax_ratio =
1325                    (rc->pb_iboost_tax_ratio - ivop_boost_total) /
1326                    rc->pb_iboost_tax_ratio;
1327    
1328            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- IFrame boost tax ratio:%.2f\n",
1329                            rc->pb_iboost_tax_ratio);
1330    
1331            /* Compute the average size of frames per frame type */
1332      for(i=0; i<3; i++) {      for(i=0; i<3; i++) {
1333          if (rc->count[i] == 0 || rc->movie_curve == 0) {                  /* Special case for missing type or weird case */
1334                    if (rc->count[i] == 0 || rc->pb_iboost_tax_ratio == 0) {
1335              rc->avg_length[i] = 1;              rc->avg_length[i] = 1;
1336          }else{          }else{
1337              rc->avg_length[i] = rc->tot_scaled_length[i] / rc->count[i] / rc->movie_curve;                          rc->avg_length[i] = rc->tot_scaled_length[i];
1338    
1339                            if (i == (XVID_TYPE_IVOP-1)) {
1340                                    /* I Frames total has to be added the boost total */
1341                                    rc->avg_length[i] += ivop_boost_total;
1342                            } else {
1343                                    /* P/B frames has to taxed */
1344                                    rc->avg_length[i] *= rc->pb_iboost_tax_ratio;
1345                            }
1346    
1347                            /* Finally compute the average frame size */
1348                            rc->avg_length[i] /= (double)rc->count[i];
1349          }          }
1350      }      }
1351    
1352      /* alt curve stuff here */          /* Assymetric curve compression */
1353            if (rc->param.curve_compression_high || rc->param.curve_compression_low) {
1354                    double symetric_total;
1355                    double assymetric_delta_total;
1356    
1357      if (rc->param.use_alt_curve) {                  /* Like I frame boosting, assymetric curve compression modifies the total
1358          const double avg_pvop = rc->avg_length[XVID_TYPE_PVOP-1];                   * amount of needed bits, we must compute the ratio so we can prescale
1359          const uint64_t tot_pvop = rc->tot_length[XVID_TYPE_PVOP-1];                   lengths */
1360          const uint64_t tot_bvop = rc->tot_length[XVID_TYPE_BVOP-1];                  symetric_total = 0;
1361          const uint64_t tot_scaled_pvop = rc->tot_scaled_length[XVID_TYPE_PVOP-1];                  assymetric_delta_total = 0;
1362          const uint64_t tot_scaled_bvop = rc->tot_scaled_length[XVID_TYPE_BVOP-1];                  for (i=0; i<rc->num_frames; i++) {
1363                            double assymetric_delta;
1364                            double dbytes;
1365                            twopass_stat_t * s = &rc->stats[i];
1366    
1367                  rc->alt_curve_low = avg_pvop - avg_pvop * (double)rc->param.alt_curve_low_dist / 100.0;                          /* I Frames are not concerned by assymetric scaling */
1368                  rc->alt_curve_low_diff = avg_pvop - rc->alt_curve_low;                          if (s->type == XVID_TYPE_IVOP)
1369                  rc->alt_curve_high = avg_pvop + avg_pvop * (double)rc->param.alt_curve_high_dist / 100.0;                                  continue;
                 rc->alt_curve_high_diff = rc->alt_curve_high - avg_pvop;  
1370    
1371          if (rc->param.alt_curve_use_auto) {                          /* During the real run, we would have to apply the iboost tax */
1372              if (tot_bvop + tot_pvop > tot_scaled_bvop + tot_scaled_pvop) {                          dbytes = s->scaled_length * rc->pb_iboost_tax_ratio;
                                 rc->param.alt_curve_min_rel_qual = (int)(100.0 - (100.0 - 100.0 /  
                                         ((double)(tot_pvop + tot_bvop) / (double)(tot_scaled_pvop + tot_scaled_bvop))) * (double)rc->param.alt_curve_auto_str / 100.0);  
1373    
1374                                  if (rc->param.alt_curve_min_rel_qual < 20)                          /* Update the symmetric curve compression total */
1375                                          rc->param.alt_curve_min_rel_qual = 20;                          symetric_total += dbytes;
1376              }else{  
1377                                  rc->param.alt_curve_min_rel_qual = 100;                          /* Apply assymetric curve compression */
1378                            if (dbytes > rc->avg_length[s->type-1])
1379                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * (double)rc->param.curve_compression_high / 100.0f;
1380                            else
1381                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * (double)rc->param.curve_compression_low  / 100.0f;
1382    
1383                            /* Cap to the minimum frame size if needed */
1384                            if (dbytes + assymetric_delta < rc->min_length[s->type-1])
1385                                    assymetric_delta = rc->min_length[s->type-1] - dbytes;
1386    
1387                            /* Accumulate after assymetric curve compression */
1388                            assymetric_delta_total += assymetric_delta;
1389              }              }
1390    
1391                    /* Compute the tax that all p/b frames have to pay in order to respect the
1392                     * bit distribution changes that the assymetric compression curve imposes
1393                     * We want assymetric_total = sum(0, n-1, tax.scaled_length)
1394                     *      ie assymetric_total = ratio.sum(0, n-1, scaled_length)
1395                     *         ratio = assymetric_total / symmetric_total */
1396                    rc->assymetric_tax_ratio = ((double)symetric_total - (double)assymetric_delta_total) / (double)symetric_total;
1397            } else {
1398                    rc->assymetric_tax_ratio = 1.0f;
1399          }          }
                 rc->alt_curve_mid_qual = (1.0 + (double)rc->param.alt_curve_min_rel_qual / 100.0) / 2.0;  
                 rc->alt_curve_qual_dev = 1.0 - rc->alt_curve_mid_qual;  
1400    
1401          if (rc->param.alt_curve_low_dist > 100) {          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Assymetric tax ratio:%.2f\n", rc->assymetric_tax_ratio);
1402                          switch(rc->param.alt_curve_type) {  
1403              case XVID_CURVE_SINE: // Sine Curve (high aggressiveness)          /* Last bits that need to be reset */
1404                                  rc->alt_curve_qual_dev *= 2.0 / (1.0 + sin(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff)));          rc->overflow = 0;
1405                                  rc->alt_curve_mid_qual = 1.0 - rc->alt_curve_qual_dev * sin(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff));          rc->KFoverflow = 0;
1406                                  break;          rc->KFoverflow_partial = 0;
1407                          case XVID_CURVE_LINEAR: // Linear (medium aggressiveness)          rc->KF_idx = 0;
1408                                  rc->alt_curve_qual_dev *= 2.0 / (1.0 + avg_pvop / rc->alt_curve_low_diff);          rc->desired_total = 0;
1409                                  rc->alt_curve_mid_qual = 1.0 - rc->alt_curve_qual_dev * avg_pvop / rc->alt_curve_low_diff;          rc->real_total = 0;
1410                                  break;  
1411                          case XVID_CURVE_COSINE: // Cosine Curve (low aggressiveness)          /* Job done */
1412                                  rc->alt_curve_qual_dev *= 2.0 / (1.0 + (1.0 - cos(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff))));          return;
                                 rc->alt_curve_mid_qual = 1.0 - rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff)));  
1413                          }                          }
1414    
1415    /*****************************************************************************
1416     * VBV compliancy check and scale
1417     * MPEG-4 standard specifies certain restrictions for bitrate/framesize in VBR
1418     * to enable playback on devices with limited readspeed and memory (and which
1419     * aren't...)
1420     *
1421     * DivX profiles have 2 criteria: VBV as in MPEG standard
1422     *                                a limit on peak bitrate for any 3 seconds
1423     *
1424     * But if VBV is fulfilled, peakrate is automatically fulfilled in any profile
1425     * define so far, so we check for it (for completeness) but correct only VBV
1426     *
1427     *****************************************************************************/
1428    
1429    #define VBV_COMPLIANT 0
1430    #define VBV_UNDERFLOW 1 /* video buffer runs empty */
1431    #define VBV_OVERFLOW 2  /* doesn't exist for VBR encoding */
1432    #define VBV_PEAKRATE 4  /* peak bitrate (within 3s) violated */
1433    
1434    static int check_curve_for_vbv_compliancy(rc_2pass2_t * rc, const float fps)
1435    {
1436    /* We do all calculations in float, for higher accuracy,
1437       and in bytes for convenience
1438    
1439       typical values from DivX Home Theater profile:
1440       vbv_size= 384*1024 (384kB), vbv_initial= 288*1024 (75% fill)
1441       maxrate= 4000000 (4MBps), peakrate= 10000000 (10MBps)
1442    
1443       PAL: offset3s = 75 (3 seconds of 25fps)
1444       NTSC: offset3s = 90 (3 seconds of 29.97fps) or 72 (3 seconds of 23.976fps)
1445    */
1446    
1447      const float vbv_size = (float)rc->param.vbv_size/8.f;
1448      float vbvfill = (float)rc->param.vbv_initial/8.f;
1449    
1450      const float maxrate = (float)rc->param.vbv_maxrate;
1451      const float peakrate = (float)rc->param.vbv_peakrate;
1452      const float r0 = (int)(maxrate/fps+0.5)/8.f;
1453    
1454      int bytes3s = 0;
1455      int offset3s = (int)(3.f*fps+0.5);
1456    
1457      int i;
1458      for (i=0; i<rc->num_frames; i++) {
1459    /* DivX 3s peak bitrate check  */
1460    
1461        bytes3s += rc->stats[i].scaled_length;
1462        if (i>=offset3s)
1463          bytes3s -= rc->stats[i-offset3s].scaled_length;
1464    
1465        if (8.f*bytes3s > 3*peakrate)
1466          return VBV_PEAKRATE;
1467    
1468    /* update vbv fill level */
1469    
1470        vbvfill += r0 - rc->stats[i].scaled_length;
1471    
1472    /* this check is _NOT_ an "overflow"! only reading from disk stops then */
1473        if (vbvfill > vbv_size)
1474          vbvfill = vbv_size;
1475    
1476    /* but THIS would be an underflow. report it! */
1477        if (vbvfill < 0)
1478          return VBV_UNDERFLOW;
1479                  }                  }
1480    
1481      return VBV_COMPLIANT;
1482      }      }
1483    /* TODO: store min(vbvfill) and print "minimum buffer fill" */
1484    
     /* --- */  
1485    
1486      total1=total2=0;  static int scale_curve_for_vbv_compliancy(rc_2pass2_t * rc, const float fps)
1487    {
1488    /* correct any VBV violations. Peak bitrate violations disappears
1489       by this automatically
1490    
1491      for (i=0; i<rc->num_frames; i++) {     This implementation follows
         stat_t * s = &rc->stats[i];  
1492    
1493          if (s->type != XVID_TYPE_IVOP) {     Westerink, Rajagopalan, Gonzales "Two-pass MPEG-2 variable-bitrate encoding"
1494              double dbytes,dbytes2;     IBM J. RES. DEVELOP. VOL 43, No. 4, July 1999, p.471--488
1495    
1496              dbytes = s->scaled_length / rc->movie_curve;     Thanks, guys! This paper rocks!!!
1497              dbytes2 = 0; /* XXX: warning */  */
             total1 += dbytes;  
             if (s->type == XVID_TYPE_BVOP)  
                 dbytes *= rc->avg_length[XVID_TYPE_PVOP-1] / rc->avg_length[XVID_TYPE_BVOP-1];  
1498    
1499              if (rc->param.use_alt_curve) {  /*
1500                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {      For each scene of len N, we have to check up to N^2 possible buffer fills.
1501        This works well with MPEG-2 where N==12 or so, but for MPEG-4 it's a
1502        little slow...
1503    
1504                      if (dbytes >= rc->alt_curve_high) {      TODO: Better control on VBVfill between scenes
1505                                                  dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev);  */
1506                      }else{  
1507                                                  switch(rc->param.alt_curve_type) {    const float vbv_size = (float)rc->param.vbv_size/8.f;
1508                          case XVID_CURVE_SINE :    const float vbv_initial = (float)rc->param.vbv_initial/8.f;
1509                                                      dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * sin(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_high_diff)));  
1510                                                          break;    const float maxrate = 0.9*rc->param.vbv_maxrate;
1511                          case XVID_CURVE_LINEAR :    const float vbv_low = 0.10f*vbv_size;
1512                                                      dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) / rc->alt_curve_high_diff);    const float r0 = (int)(maxrate/fps+0.5)/8.f;
1513                                                          break;  
1514                                                  case XVID_CURVE_COSINE :    int i,k,l,n,violation = 0;
1515                                                      dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_high_diff))));    float *scenefactor;
1516      int *scenestart;
1517      int *scenelength;
1518    
1519    /* first step: determine how many "scenes" there are and store their boundaries
1520       we could get all this from existing keyframe_positions, somehow, but there we
1521       don't have a min_scenelength, and it's no big deal to get it again.  */
1522    
1523      const int min_scenelength = (int)(fps+0.5);
1524      int num_scenes = 0;
1525      int last_scene = -999;
1526      for (i=0; i<rc->num_frames; i++) {
1527        if ( (rc->stats[i].type == XVID_TYPE_IVOP) && (i-last_scene>min_scenelength) )
1528        {
1529          last_scene = i;
1530          num_scenes++;
1531                                                  }                                                  }
1532                                          }                                          }
1533                  }else{  
1534                      if (dbytes <= rc->alt_curve_low) {    scenefactor = (float*)malloc( num_scenes*sizeof(float) );
1535                                                  dbytes2 = dbytes;    scenestart = (int*)malloc( num_scenes*sizeof(int) );
1536                      }else{    scenelength = (int*)malloc( num_scenes*sizeof(int) );
1537                                                  switch(rc->param.alt_curve_type) {  
1538                                                  case XVID_CURVE_SINE :    if ((!scenefactor) || (!scenestart) || (!scenelength) )
1539                                                      dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * sin(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_low_diff)));    {
1540                                                          break;      free(scenefactor);
1541                                                  case XVID_CURVE_LINEAR :      free(scenestart);
1542                                                      dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) / rc->alt_curve_low_diff);      free(scenelength);
1543                                                          break;      /* remember: free(0) is valid and does exactly nothing. */
1544                                                  case XVID_CURVE_COSINE :      return -1;
1545                                                      dbytes2 = dbytes * (rc->alt_curve_mid_qual + rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_low_diff))));    }
1546    
1547    /* count again and safe the length/position */
1548    
1549      num_scenes = 0;
1550      last_scene = -999;
1551      for (i=0; i<rc->num_frames; i++) {
1552        if ( (rc->stats[i].type == XVID_TYPE_IVOP) && (i-last_scene>min_scenelength) )
1553        {
1554          if (num_scenes>0)
1555            scenelength[num_scenes-1]=i-last_scene;
1556          scenestart[num_scenes]=i;
1557          num_scenes++;
1558          last_scene = i;
1559                                                  }                                                  }
1560                                          }                                          }
1561      scenelength[num_scenes-1]=i-last_scene;
1562    
1563    /* second step: check for each scene, how much we can scale its frames up or down
1564       such that the VBV restriction is just fulfilled
1565    */
1566    
1567    
1568    #define R(k,n) (((n)+1-(k))*r0)     /* how much enters the buffer between frame k and n */
1569      for (l=0; l<num_scenes;l++)
1570      {
1571        const int start = scenestart[l];
1572        const int length = scenelength[l];
1573        twopass_stat_t * frames = &rc->stats[start];
1574    
1575        float S0n,Skn;
1576        float f,minf = 99999.f;
1577    
1578        S0n=0.;
1579        for (n=0;n<=length-1;n++)
1580        {
1581          S0n += frames[n].scaled_length;
1582    
1583          k=0;
1584          Skn = S0n;
1585          f = (R(k,n-1) + (vbv_initial - vbv_low)) / Skn;
1586          if (f < minf)
1587            minf = f;
1588    
1589          for (k=1;k<=n;k++)
1590          {
1591            Skn -= frames[k].scaled_length;
1592    
1593            f = (R(k,n-1) + (vbv_size - vbv_low)) / Skn;
1594            if (f < minf)
1595              minf = f;
1596          }
1597                  }                  }
1598    
1599        /* special case: at the end, fill buffer up to vbv_initial again
1600           TODO: Allow other values for buffer fill between scenes
1601           e.g. if n=N is smallest f-value, then check for better value */
1602    
1603              }else{      n=length;
1604                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {      k=0;
1605                      dbytes2=((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_high / 100.0);      Skn = S0n;
1606                  }else{      f = R(k,n-1)/Skn;
1607                                  dbytes2 = ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_low / 100.0);      if (f < minf)
1608          minf = f;
1609    
1610        for (k=1;k<=n-1;k++)
1611        {
1612          Skn -= frames[k].scaled_length;
1613    
1614          f = (R(k,n-1) + (vbv_initial - vbv_low)) / Skn;
1615          if (f < minf)
1616            minf = f;
1617                  }                  }
1618    
1619    #ifdef VBV_DEBUG
1620        printf("Scene %d (Frames %d-%d): VBVfactor %f\n", l, start, start+length-1 , minf);
1621    #endif
1622    
1623        scenefactor[l] = minf;
1624              }              }
1625    #undef R
1626    
1627              if (s->type == XVID_TYPE_BVOP) {  /* last step: now we know of any scene how much it can be scaled up or down without
1628                              dbytes2 *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];     violating VBV. Next, distribute bits from the evil scenes to the good ones */
1629                              if (dbytes2 < rc->min_length[XVID_TYPE_BVOP-1])  
1630                                      dbytes2 = rc->min_length[XVID_TYPE_BVOP-1];    do
1631              }else{    {
1632                              if (dbytes2 < rc->min_length[XVID_TYPE_PVOP-1])      float S_red = 0.f;    /* how much to redistribute */
1633                                      dbytes2 = rc->min_length[XVID_TYPE_PVOP-1];      float S_elig = 0.f;   /* sum of bit for those scenes you can still swallow something*/
1634        int l;
1635    
1636        for (l=0;l<num_scenes;l++)   /* check how much is wrong */
1637        {
1638        const int start = scenestart[l];
1639        const int length = scenelength[l];
1640        twopass_stat_t * frames = &rc->stats[start];
1641    
1642          if (scenefactor[l] == 1.) /* exactly 1 means "don't touch this anymore!" */
1643            continue;
1644    
1645          if (scenefactor[l] > 1.) /* within limits */
1646          {
1647            for (n= 0; n < length; n++)
1648              S_elig += frames[n].scaled_length;
1649          }
1650          else /* underflowing segment */
1651          {
1652            for (n= 0; n < length; n++)
1653            {
1654              float newbytes = (float)frames[n].scaled_length * scenefactor[l];
1655              S_red += (float)frames[n].scaled_length - (float)newbytes;
1656              frames[n].scaled_length =(int)newbytes;
1657              }              }
1658              total2 += dbytes2;          scenefactor[l] = 1.f;
1659          }          }
1660      }      }
1661    
1662      rc->curve_comp_scale = total1 / total2;      if (S_red < 1.f)   /* no more underflows */
1663          break;
1664    
1665      if (!rc->param.use_alt_curve) {      if (S_elig < 1.f)
1666          DPRINTF(XVID_DEBUG_RC, "middle frame size for asymmetric curve compression: %i\n",      {
1667              (int)(rc->avg_length[XVID_TYPE_PVOP-1] * rc->curve_comp_scale));  #ifdef VBV_DEBUG
1668          fprintf(stderr,"Everything underflowing. \n");
1669    #endif
1670          free(scenefactor);
1671          free(scenestart);
1672          free(scenelength);
1673          return -2;
1674      }      }
1675    
1676      if (rc->param.use_alt_curve) {      const float f_red = (1.f + S_red/S_elig);
         int bonus_bias = rc->param.alt_curve_bonus_bias;  
         int oldquant = 1;  
1677    
1678              if (rc->param.alt_curve_use_auto_bonus_bias)  #ifdef VBV_DEBUG
1679                      bonus_bias = rc->param.alt_curve_min_rel_qual;      printf("Moving %.0f kB to avoid buffer underflow, correction factor: %.5f\n",S_red/1024.f,f_red);
1680    #endif
1681    
1682              rc->alt_curve_curve_bias_bonus = (total1 - total2) * (double)bonus_bias / 100.0 / (double)(rc->num_frames /* - credits_frames */ - rc->num_keyframes);      violation=0;
1683              rc->curve_comp_scale = ((total1 - total2) * (1.0 - (double)bonus_bias / 100.0) + total2) / total2;      for (l=0; l<num_scenes; l++)   /* scale remaining scenes up to meet total size */
1684        {
1685          const int start = scenestart[l];
1686          const int length = scenelength[l];
1687          twopass_stat_t * frames = &rc->stats[start];
1688    
1689          if (scenefactor[l] == 1.)
1690            continue;
1691    
1692          /* special info for alt curve:  bias bonus and quantizer thresholds */        /* there shouldn't be any segments with factor<1 left, so all the rest is >1 */
1693    
1694                  DPRINTF(XVID_DEBUG_RC, "avg scaled framesize:%i\n", (int)rc->avg_length[XVID_TYPE_PVOP-1]);        for (n= 0; n < length; n++)
1695                  DPRINTF(XVID_DEBUG_RC, "bias bonus:%i bytes\n", (int)rc->alt_curve_curve_bias_bonus);        {
1696            frames[n].scaled_length = (int)(frames[n].scaled_length * f_red + 0.5);
1697          }
1698    
1699                  for (i=1; i <= (int)(rc->alt_curve_high*2)+1; i++) {        scenefactor[l] /= f_red;
1700              double curve_temp, dbytes;        if (scenefactor[l] < 1.f)
1701              int newquant;          violation=1;
1702        }
1703    
1704              dbytes = i;    } while (violation);
1705                          if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {  
1706                  if (dbytes >= rc->alt_curve_high) {    free(scenefactor);
1707                                          curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev);    free(scenestart);
1708                  }else{    free(scenelength);
1709                                          switch(rc->param.alt_curve_type)    return 0;
1710    }
1711    
1712    
1713    /*****************************************************************************
1714     * Still more low level stuff (nothing to do with stats treatment)
1715     ****************************************************************************/
1716    
1717    /* This function returns an allocated string containing a complete line read
1718     * from the file starting at the current position */
1719    static char *
1720    readline(FILE *f)
1721                                          {                                          {
1722                                          case XVID_CURVE_SINE :          char *buffer = NULL;
1723                                                  curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * sin(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_high_diff)));          int buffer_size = 0;
1724                                                  break;          int pos = 0;
1725                                          case XVID_CURVE_LINEAR :  
1726                                                  curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) / rc->alt_curve_high_diff);          do {
1727                    int c;
1728    
1729                    /* Read a character from the stream */
1730                    c = fgetc(f);
1731    
1732                    /* Is that EOF or new line ? */
1733                    if(c == EOF || c == '\n')
1734                                                  break;                                                  break;
1735                                          case XVID_CURVE_COSINE :  
1736                                                  curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_high_diff))));                  /* Do we have to update buffer ? */
1737                    if(pos >= buffer_size - 1) {
1738                            buffer_size += BUF_SZ;
1739                            buffer = (char*)realloc(buffer, buffer_size);
1740                            if (buffer == NULL)
1741                                    return(NULL);
1742                                          }                                          }
1743    
1744                    buffer[pos] = c;
1745                    pos++;
1746            } while(1);
1747    
1748            /* Read \n or EOF */
1749            if (buffer == NULL) {
1750                    /* EOF, so we reached the end of the file, return NULL */
1751                    if(feof(f))
1752                            return(NULL);
1753    
1754                    /* Just an empty line with just a newline, allocate a 1 byte buffer to
1755                     * store a zero length string */
1756                    buffer = (char*)malloc(1);
1757                    if(buffer == NULL)
1758                            return(NULL);
1759                                  }                                  }
1760                          }else{  
1761                  if (dbytes <= rc->alt_curve_low) {          /* Zero terminated string */
1762                                          curve_temp = dbytes;          buffer[pos] = '\0';
1763                  }else{  
1764                                          switch(rc->param.alt_curve_type)          return(buffer);
1765    }
1766    
1767    /* This function returns a pointer to the first non space char in the given
1768     * string */
1769    static char *
1770    skipspaces(char *string)
1771                                          {                                          {
1772                                          case XVID_CURVE_SINE :          const char spaces[] =
1773                                                  curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * sin(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_low_diff)));                  {
1774                                                  break;                          ' ','\t','\0'
1775                                          case XVID_CURVE_LINEAR :                  };
1776                                                  curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) / rc->alt_curve_low_diff);          const char *spacechar = spaces;
1777    
1778            if (string == NULL) return(NULL);
1779    
1780            while (*string != '\0') {
1781                    /* Test against space chars */
1782                    while (*spacechar != '\0') {
1783                            if (*string == *spacechar) {
1784                                    string++;
1785                                    spacechar = spaces;
1786                                                  break;                                                  break;
                                         case XVID_CURVE_COSINE :  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual + rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_low_diff))));  
                                         }  
1787                                  }                                  }
1788                            spacechar++;
1789                          }                          }
1790    
1791                          if (rc->movie_curve > 1.0)                  /* No space char */
1792                                  dbytes *= rc->movie_curve;                  if (*spacechar == '\0') return(string);
1793            }
1794    
1795                          newquant = (int)(dbytes * 2.0 / (curve_temp * rc->curve_comp_scale + rc->alt_curve_curve_bias_bonus));          return(string);
                         if (newquant > 1) {  
                                 if (newquant != oldquant) {  
                     int percent = (int)((i - rc->avg_length[XVID_TYPE_PVOP-1]) * 100.0 / rc->avg_length[XVID_TYPE_PVOP-1]);  
                                         oldquant = newquant;  
                                         DPRINTF(XVID_DEBUG_RC, "quant:%i threshold at %i : %i percent\n", newquant, i, percent);  
1796                                  }                                  }
1797    
1798    /* This function returns a boolean that tells if the string is only a
1799     * comment */
1800    static int
1801    iscomment(char *string)
1802    {
1803            const char comments[] =
1804                    {
1805                            '#',';', '%', '\0'
1806                    };
1807            const char *cmtchar = comments;
1808            int iscomment = 0;
1809    
1810            if (string == NULL) return(1);
1811    
1812            string = skipspaces(string);
1813    
1814            while(*cmtchar != '\0') {
1815                    if(*string == *cmtchar) {
1816                            iscomment = 1;
1817                            break;
1818                          }                          }
1819                    cmtchar++;
1820                  }                  }
1821    
1822            return(iscomment);
1823      }      }
1824    
1825      rc->overflow = 0;  #if 0
1826      rc->KFoverflow = 0;  static void
1827      rc->KFoverflow_partial = 0;  stats_print(rc_2pass2_t * rc)
1828      rc->KF_idx = 1;  {
1829            int i;
1830            const char frame_type[4] = { 'i', 'p', 'b', 's'};
1831    
1832            for (i=0; i<rc->num_frames; i++) {
1833                    twopass_stat_t *s = &rc->stats[i];
1834                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- frame:%d type:%c quant:%d stats:%d scaled:%d desired:%d actual:%d overflow(%c):%.2f\n",
1835                                    i, frame_type[s->type-1], -1, s->length, s->scaled_length,
1836                                    s->desired_length, -1, frame_type[s->type-1], -1.0f);
1837            }
1838  }  }
1839    #endif
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