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revision 1048, Thu May 29 11:37:20 2003 UTC revision 1448, Sun May 9 14:00:35 2004 UTC
# Line 25  Line 25 
25   * along with this program; if not, write to the Free Software   * along with this program; if not, write to the Free Software
26   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
27   *   *
28   * $Id: plugin_2pass2.c,v 1.1.2.15 2003-05-29 11:37:20 edgomez Exp $   * $Id: plugin_2pass2.c,v 1.1.2.38 2004-05-09 14:00:35 chl Exp $
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    
53  #define DEFAULT_KEYFRAME_BOOST 0  #define DEFAULT_KEYFRAME_BOOST 0
54  #define DEFAULT_PAYBACK_METHOD XVID_PAYBACK_PROP  #define DEFAULT_OVERFLOW_CONTROL_STRENGTH 10
 #define DEFAULT_BITRATE_PAYBACK_DELAY 250  
55  #define DEFAULT_CURVE_COMPRESSION_HIGH 0  #define DEFAULT_CURVE_COMPRESSION_HIGH 0
56  #define DEFAULT_CURVE_COMPRESSION_LOW 0  #define DEFAULT_CURVE_COMPRESSION_LOW 0
57  #define DEFAULT_MAX_OVERFLOW_IMPROVEMENT 60  #define DEFAULT_MAX_OVERFLOW_IMPROVEMENT 10
58  #define DEFAULT_MAX_OVERFLOW_DEGRADATION 60  #define DEFAULT_MAX_OVERFLOW_DEGRADATION 10
59    
60  /* Keyframe settings */  /* Keyframe settings */
 #define DEFAULT_KFTRESHOLD 10  
61  #define DEFAULT_KFREDUCTION 20  #define DEFAULT_KFREDUCTION 20
62  #define DEFAULT_MIN_KEY_INTERVAL 1  #define DEFAULT_KFTHRESHOLD 1
63    
64    /*****************************************************************************
65     * Some default constants (can be tuned)
66     ****************************************************************************/
67    
68    /* Specify the invariant part of the headers bits (header+MV)
69     * as  hlength/cst */
70    #define INVARIANT_HEADER_PART_IVOP 1 /* factor 1.0f   */
71    #define INVARIANT_HEADER_PART_PVOP 2 /* factor 0.5f   */
72    #define INVARIANT_HEADER_PART_BVOP 8 /* factor 0.125f */
73    
74  /*****************************************************************************  /*****************************************************************************
75   * Structures   * Structures
# Line 63  Line 81 
81      int quant;              /* first pass quant */      int quant;              /* first pass quant */
82          int blks[3];                    /* k,m,y blks */          int blks[3];                    /* k,m,y blks */
83      int length;             /* first pass length */      int length;             /* first pass length */
84            int invariant;          /* what we assume as being invariant between the two passes, it's a sub part of header + MV bits */
85      int scaled_length;      /* scaled length */      int scaled_length;      /* scaled length */
86      int desired_length;     /* desired length; calcuated during encoding */          int desired_length;     /* desired length; calculated during encoding */
87            int error;
88    
89      int zone_mode;   /* XVID_ZONE_xxx */      int zone_mode;   /* XVID_ZONE_xxx */
90      double weight;      double weight;
91  } stat_t;  } twopass_stat_t;
92    
93  /* Context struct */  /* Context struct */
94  typedef struct  typedef struct
95  {  {
96      xvid_plugin_2pass2_t param;      xvid_plugin_2pass2_t param;
97    
98      /* constant statistical data */          /*----------------------------------
99          int num_frames;           * constant statistical data
100          int num_keyframes;           *--------------------------------*/
         uint64_t target;        /* target filesize */  
101    
102          int count[3];   /* count of each frame types */          /* Number of frames of the sequence */
103          uint64_t tot_length[3];  /* total length of each frame types */          int num_frames;
         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 */  
104    
105            /* Number of Intra frames of the sequence */
106            int num_keyframes;
107    
108          double curve_comp_scale;          /* Target filesize to reach */
109          double movie_curve;          uint64_t target;
110    
111          /* dynamic */          /* Count of each frame types */
112            int count[3];
113    
114            /* Total length of each frame types (1st pass) */
115            uint64_t tot_length[3];
116            uint64_t tot_invariant[3];
117    
118            /* Average length of each frame types (used first for 1st pass data and
119             * then for scaled averages */
120            double avg_length[3];
121    
122            /* Minimum frame length allowed for each frame type */
123            int min_length[3];
124    
125            /* Total bytes per frame type once the curve has been scaled
126             * NB: advanced parameters do not change this value. This field
127             *     represents the total scaled w/o any advanced settings */
128            uint64_t tot_scaled_length[3];
129    
130            /* Maximum observed frame size observed during the first pass, the RC
131             * will try tp force all frame sizes in the second pass to be under that
132             * limit */
133            int max_length;
134    
135            /*----------------------------------
136             * Zones statistical data
137             *--------------------------------*/
138    
139            /* Total length used by XVID_ZONE_QUANT zones */
140            uint64_t tot_quant;
141            uint64_t tot_quant_invariant;
142    
143            /* Holds the total amount of frame bytes, zone weighted (only scalable
144             * part of frame bytes) */
145            uint64_t tot_weighted;
146    
147            /*----------------------------------
148             * Advanced settings helper ratios
149             *--------------------------------*/
150    
151            /* This the ratio that has to be applied to all p/b frames in order
152             * to reserve/retrieve bits for/from keyframe boosting and consecutive
153             * keyframe penalty */
154            double pb_iboost_tax_ratio;
155    
156            /* This the ratio to apply to all b/p frames in order to respect the
157             * assymetric curve compression while respecting a target filesize
158             * NB: The assymetric delta gain has to be computed before this ratio
159             *     is applied, and then the delta is added to the scaled size */
160            double assymetric_tax_ratio;
161    
162            /*----------------------------------
163             * Data from the stats file kept
164             * into RAM for easy access
165             *--------------------------------*/
166    
167            /* Array of keyframe locations
168             * eg: rc->keyframe_locations[100] returns the frame number of the 100th
169             *     keyframe */
170          int * keyframe_locations;          int * keyframe_locations;
         stat_t * stats;  
171    
172            /* Index of the last keyframe used in the keyframe_location */
173            int KF_idx;
174    
175            /* Array of all 1st pass data file -- see the twopass_stat_t structure
176             * definition for more details */
177            twopass_stat_t * stats;
178    
179            /*----------------------------------
180             * Hysteresis helpers
181             *--------------------------------*/
182    
183            /* This field holds the int2float conversion errors of each quant per
184             * frame type, this allow the RC to keep track of rouding error and thus
185             * increase or decrease the chosen quant according to this residue */
186          double quant_error[3][32];          double quant_error[3][32];
187          int quant_count[32];  
188            /* This fields stores the count of each quant usage per frame type
189             * No real role but for debugging */
190            int quant_count[3][32];
191    
192            /* Last valid quantizer used per frame type, it allows quantizer
193             * increament/decreament limitation in order to avoid big image quality
194             * "jumps" */
195          int last_quant[3];          int last_quant[3];
196    
197          double curve_comp_error;          /*----------------------------------
198          int overflow;           * Overflow control
199          int KFoverflow;           *--------------------------------*/
200          int KFoverflow_partial;  
201          int KF_idx;          /* Current overflow that has to be distributed to p/b frames */
202            double overflow;
203    
204            /* Total overflow for keyframes -- not distributed directly */
205            double KFoverflow;
206    
207            /* Amount of keyframe overflow to introduce to the global p/b frame
208             * overflow counter at each encoded frame */
209            double KFoverflow_partial;
210    
211            /* Unknown ???
212             * ToDo: description */
213          double fq_error;          double fq_error;
214    
215            int min_quant; /* internal minimal quant, prevents wrong quants from being used */
216    
217            /*----------------------------------
218             * Debug
219             *--------------------------------*/
220            double desired_total;
221            double real_total;
222  } rc_2pass2_t;  } rc_2pass2_t;
223    
224    
# Line 132  Line 240 
240  {  {
241      switch(opt) {      switch(opt) {
242      case XVID_PLG_INFO :      case XVID_PLG_INFO :
243            case XVID_PLG_FRAME :
244          return 0;          return 0;
245    
246      case XVID_PLG_CREATE :      case XVID_PLG_CREATE :
# Line 155  Line 264 
264   ****************************************************************************/   ****************************************************************************/
265    
266  /* First a few local helping function prototypes */  /* First a few local helping function prototypes */
267  static  int det_stats_length(rc_2pass2_t * rc, char * filename);  static  int statsfile_count_frames(rc_2pass2_t * rc, char * filename);
268  static  int load_stats(rc_2pass2_t *rc, char * filename);  static  int statsfile_load(rc_2pass2_t *rc, char * filename);
269  static void zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create);  static void zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create);
270  static void internal_scale(rc_2pass2_t *rc);  static void first_pass_stats_prepare_data(rc_2pass2_t * rc);
271  static void pre_process0(rc_2pass2_t * rc);  static void first_pass_scale_curve_internal(rc_2pass2_t *rc);
272  static void pre_process1(rc_2pass2_t * rc);  static void scaled_curve_apply_advanced_parameters(rc_2pass2_t * rc);
273    #ifdef VBV
274    static  int check_curve_for_vbv_compliancy(rc_2pass2_t * rc, const float fps);
275    static  int scale_curve_for_vbv_compliancy(rc_2pass2_t * rc, const float fps);
276    #endif
277    
278    #if 0
279    static void stats_print(rc_2pass2_t * rc);
280    #endif
281    
282  /*----------------------------------------------------------------------------  /*----------------------------------------------------------------------------
283   *--------------------------------------------------------------------------*/   *--------------------------------------------------------------------------*/
# Line 178  Line 295 
295    
296      rc->param = *param;      rc->param = *param;
297    
298          /*          /* Initialize all defaults */
          * Initialize all defaults  
          */  
299  #define _INIT(a, b) if((a) <= 0) (a) = (b)  #define _INIT(a, b) if((a) <= 0) (a) = (b)
300      /* Let's set our defaults if needed */      /* Let's set our defaults if needed */
301          _INIT(rc->param.keyframe_boost, DEFAULT_KEYFRAME_BOOST);          _INIT(rc->param.keyframe_boost, DEFAULT_KEYFRAME_BOOST);
302          _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);  
303      _INIT(rc->param.curve_compression_high, DEFAULT_CURVE_COMPRESSION_HIGH);      _INIT(rc->param.curve_compression_high, DEFAULT_CURVE_COMPRESSION_HIGH);
304      _INIT(rc->param.curve_compression_low, DEFAULT_CURVE_COMPRESSION_LOW);      _INIT(rc->param.curve_compression_low, DEFAULT_CURVE_COMPRESSION_LOW);
305      _INIT(rc->param.max_overflow_improvement, DEFAULT_MAX_OVERFLOW_IMPROVEMENT);      _INIT(rc->param.max_overflow_improvement, DEFAULT_MAX_OVERFLOW_IMPROVEMENT);
306      _INIT(rc->param.max_overflow_degradation,  DEFAULT_MAX_OVERFLOW_DEGRADATION);      _INIT(rc->param.max_overflow_degradation,  DEFAULT_MAX_OVERFLOW_DEGRADATION);
307    
308      /* Keyframe settings */      /* Keyframe settings */
         _INIT(rc->param.kftreshold, DEFAULT_KFTRESHOLD);  
309      _INIT(rc->param.kfreduction, DEFAULT_KFREDUCTION);      _INIT(rc->param.kfreduction, DEFAULT_KFREDUCTION);
310      _INIT(rc->param.min_key_interval, DEFAULT_MIN_KEY_INTERVAL);          _INIT(rc->param.kfthreshold, DEFAULT_KFTHRESHOLD);
311  #undef _INIT  #undef _INIT
312    
313          /* Initialize some stuff to zero */          /* Initialize some stuff to zero */
         for(i=0; i<32; i++) rc->quant_count[i] = 0;  
   
314          for(i=0; i<3; i++) {          for(i=0; i<3; i++) {
315                  int j;                  int j;
316                  for (j=0; j<32; j++)                  for (j=0; j<32; j++) {
317                          rc->quant_error[i][j] = 0;                          rc->quant_error[i][j] = 0;
318                            rc->quant_count[i][j] = 0;
319                    }
320          }          }
321    
322          for (i=0; i<3; i++)          for (i=0; i<3; i++) rc->last_quant[i] = 0;
                 rc->last_quant[i] = 0;  
323    
324          rc->fq_error = 0;          rc->fq_error = 0;
325            rc->min_quant = 1;
326    
327          /* Count frames in the stats file */          /* Count frames (and intra frames) in the stats file, store the result into
328          if (!det_stats_length(rc, param->filename)) {           * the rc structure */
329                  DPRINTF(XVID_DEBUG_RC,"ERROR: fopen %s failed\n", param->filename);          if (statsfile_count_frames(rc, param->filename) == -1) {
330                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- ERROR: fopen %s failed\n", param->filename);
331                  free(rc);                  free(rc);
332                  return XVID_ERR_FAIL;                  return(XVID_ERR_FAIL);
333          }          }
334    
335      /* Allocate the stats' memory */      /* Allocate the stats' memory */
336          if ((rc->stats = malloc(rc->num_frames * sizeof(stat_t))) == NULL) {          if ((rc->stats = malloc(rc->num_frames * sizeof(twopass_stat_t))) == NULL) {
337          free(rc);          free(rc);
338          return XVID_ERR_MEMORY;                  return(XVID_ERR_MEMORY);
339      }      }
340    
341      /*          /* Allocate keyframes location's memory
342           * Allocate keyframes location's memory           * PS: see comment in pre_process0 for the +1 location requirement */
          * PS: see comment in pre_process0 for the +1 location requirement  
          */  
343          rc->keyframe_locations = malloc((rc->num_keyframes + 1) * sizeof(int));          rc->keyframe_locations = malloc((rc->num_keyframes + 1) * sizeof(int));
344          if (rc->keyframe_locations == NULL) {          if (rc->keyframe_locations == NULL) {
345                  free(rc->stats);                  free(rc->stats);
346                  free(rc);                  free(rc);
347                  return XVID_ERR_MEMORY;                  return(XVID_ERR_MEMORY);
348          }          }
349    
350          if (!load_stats(rc, param->filename)) {          /* Load the first pass stats */
351                  DPRINTF(XVID_DEBUG_RC,"ERROR: fopen %s failed\n", param->filename);          if (statsfile_load(rc, param->filename) == -1) {
352                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- ERROR: fopen %s failed\n", param->filename);
353                  free(rc->keyframe_locations);                  free(rc->keyframe_locations);
354                  free(rc->stats);                  free(rc->stats);
355                  free(rc);                  free(rc);
# Line 244  Line 357 
357          }          }
358    
359          /* Compute the target filesize */          /* Compute the target filesize */
360          if (rc->num_frames  < create->fbase/create->fincr) {          if (rc->param.bitrate<0) {
361                    /* if negative, bitrate equals the target (in kbytes) */
362                    rc->target = ((uint64_t)(-rc->param.bitrate)) * 1024;
363            } else if (rc->num_frames  < create->fbase/create->fincr) {
364                  /* Source sequence is less than 1s long, we do as if it was 1s long */                  /* Source sequence is less than 1s long, we do as if it was 1s long */
365                  rc->target = rc->param.bitrate / 8;                  rc->target = rc->param.bitrate / 8;
366          } else {          } else {
# Line 255  Line 371 
371                          ((uint64_t)create->fbase * 8);                          ((uint64_t)create->fbase * 8);
372          }          }
373    
374          DPRINTF(XVID_DEBUG_RC, "Frame rate: %d/%d (%ffps)\n",          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Frame rate: %d/%d (%ffps)\n",
375                          create->fbase, create->fincr,                          create->fbase, create->fincr,
376                          (double)create->fbase/(double)create->fincr);                          (double)create->fbase/(double)create->fincr);
377          DPRINTF(XVID_DEBUG_RC, "Number of frames: %d\n", rc->num_frames);          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Number of frames: %d\n", rc->num_frames);
378          DPRINTF(XVID_DEBUG_RC, "Target bitrate: %ld\n", rc->param.bitrate);          if(rc->param.bitrate>=0)
379          DPRINTF(XVID_DEBUG_RC, "Target filesize: %lld\n", rc->target);                  DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Target bitrate: %ld\n", rc->param.bitrate);
380            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Target filesize: %lld\n", rc->target);
381    
382          /* Compensate the average frame overhead caused by the container */          /* Compensate the average frame overhead caused by the container */
383          rc->target -= rc->num_frames*rc->param.container_frame_overhead;          rc->target -= rc->num_frames*rc->param.container_frame_overhead;
384          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);
385          DPRINTF(XVID_DEBUG_RC, "Target filesize (after container compensation): %lld\n", rc->target);          if(rc->param.container_frame_overhead)
386                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- New target filesize after container compensation: %lld\n", rc->target);
387    
388          /*          /* When bitrate is not given it means it has been scaled by an external
389           * First data pre processing:           * application */
390            if (rc->param.bitrate) {
391                    /* Apply zone settings
392                     * - set rc->tot_quant which represents the total num of bytes spent in
393                     *   fixed quant zones
394                     * - set rc->tot_weighted which represents the total amount of bytes
395                     *   spent in normal or weighted zones in first pass (normal zones can
396                     *   be considered weight=1)
397                     * - set rc->tot_quant_invariant which represents the total num of bytes
398                     *   spent in fixed quant zones for headers */
399                    zone_process(rc, create);
400            } else {
401                    /* External scaling -- zones are ignored */
402                    for (i=0;i<rc->num_frames;i++) {
403                            rc->stats[i].zone_mode = XVID_ZONE_WEIGHT;
404                            rc->stats[i].weight = 1.0;
405                    }
406                    rc->tot_quant = 0;
407            }
408    
409            /* Gathers some information about first pass stats:
410           *  - finds the minimum frame length for each frame type during 1st pass.           *  - finds the minimum frame length for each frame type during 1st pass.
411           *     rc->min_size[]           *     rc->min_size[]
412           *  - determines the maximum frame length observed (no frame type distinction).           *  - determines the maximum frame length observed (no frame type distinction).
# Line 276  Line 414 
414           *  - count how many times each frame type has been used.           *  - count how many times each frame type has been used.
415           *     rc->count[]           *     rc->count[]
416           *  - total bytes used per frame type           *  - total bytes used per frame type
417           *     rc->total[]           *     rc->tot_length[]
418             *  - total bytes considered invariant between the 2 passes
419           *  - store keyframe location           *  - store keyframe location
420           *     rc->keyframe_locations[]           *     rc->keyframe_locations[]
421           */           */
422          pre_process0(rc);          first_pass_stats_prepare_data(rc);
423    
424          /*          /* If we have a user bitrate, it means it's an internal curve scaling */
          * When bitrate is not given it means it has been scaled by an external  
          * application  
          */  
425          if (rc->param.bitrate) {          if (rc->param.bitrate) {
426                  /* Apply zone settings */                  /* Perform internal curve scaling */
427                  zone_process(rc, create);                  first_pass_scale_curve_internal(rc);
                 /* Perform curve scaling */  
                 internal_scale(rc);  
         } else {  
                 /* External scaling -- zones are ignored */  
                 for (i=0;i<rc->num_frames;i++) {  
                         rc->stats[i].zone_mode = XVID_ZONE_WEIGHT;  
                         rc->stats[i].weight = 1.0;  
428                  }                  }
429                  rc->avg_weight = 1.0;  
430                  rc->tot_quant = 0;          /* Apply advanced curve options, and compute some parameters in order to
431             * shape the curve in the BEFORE/AFTER pair of functions */
432            scaled_curve_apply_advanced_parameters(rc);
433    
434    
435    #ifdef VBV
436    /* Check curve for VBV compliancy and rescale if necessary */
437    
438    
439    #ifdef VBV_FORCE
440      if (rc->param.vbvsize==0)
441      {
442        rc->param.vbvsize      =  3145728;
443        rc->param.vbvinitial   =  2359296;
444        rc->param.vbv_maxrate  =  4000000;
445        rc->param.vbv_peakrate = 10000000;
446          }          }
447    #endif
448    
449      if (rc->param.vbvsize>0)    /* vbvsize==0 switches VBV check off */
450      {
451        const double fps = (double)create->fbase/(double)create->fincr;
452        int status = check_curve_for_vbv_compliancy(rc, fps);
453    #ifdef VBV_DEBUG
454        if (status)
455          fprintf(stderr,"underflow detected\n Scaling Curve for compliancy... ");
456    #endif
457    
458          pre_process1(rc);          status = scale_curve_for_vbv_compliancy(rc, fps);
459    
460    #ifdef VBV_DEBUG
461          if (status==0)
462            fprintf(stderr,"done.\n");
463          else
464            fprintf(stderr,"impossible.\n");
465    #endif
466      }
467    #endif
468    
469          *handle = rc;          *handle = rc;
470          return(0);          return(0);
# Line 313  Line 476 
476  static int  static int
477  rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy)  rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy)
478  {  {
479            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- target_total:%lld desired_total:%.2f (%.2f%%) actual_total:%.2f (%.2f%%)\n",
480                            rc->target,
481                            rc->desired_total,
482                            100*rc->desired_total/(double)rc->target,
483                            rc->real_total,
484                            100*rc->real_total/(double)rc->target);
485    
486      free(rc->keyframe_locations);      free(rc->keyframe_locations);
487      free(rc->stats);      free(rc->stats);
488          free(rc);          free(rc);
# Line 325  Line 495 
495  static int  static int
496  rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)  rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)
497  {  {
498          stat_t * s = &rc->stats[data->frame_num];          twopass_stat_t * s = &rc->stats[data->frame_num];
         int overflow;  
         int desired;  
499          double dbytes;          double dbytes;
         double curve_temp;  
500          double scaled_quant;          double scaled_quant;
501            double overflow;
502          int capped_to_max_framesize = 0;          int capped_to_max_framesize = 0;
503    
504          /*          /* This function is quite long but easy to understand. In order to simplify
505           * 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.  
          */  
506    
507          /* First case: Another plugin has already set a quantizer */          /* First case: Another plugin has already set a quantizer */
508      if (data->quant > 0)      if (data->quant > 0)
509                  return(0);                  return(0);
510    
511          /* Second case: We are in a Quant zone */          /* Second case: insufficent stats data
512             * We can't guess much what we should do, let core decide all alone */
513            if (data->frame_num >= rc->num_frames) {
514                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- stats file too short (now processing frame %d)",
515                            data->frame_num);
516                    return(0);
517            }
518    
519            /* Third case: We are in a Quant zone
520             * Quant zones must just ensure we use the same settings as first pass
521             * So set the quantizer and the type */
522          if (s->zone_mode == XVID_ZONE_QUANT) {          if (s->zone_mode == XVID_ZONE_QUANT) {
523                    /* Quant stuff */
524                  rc->fq_error += s->weight;                  rc->fq_error += s->weight;
525                  data->quant = (int)rc->fq_error;                  data->quant = (int)rc->fq_error;
526                  rc->fq_error -= data->quant;                  rc->fq_error -= data->quant;
527    
528                    /* The type stuff */
529                    data->type = s->type;
530    
531                    /* The only required data for AFTER step is this one for the overflow
532                     * control */
533                  s->desired_length = s->length;                  s->desired_length = s->length;
534    
535                  return(0);                  return(0);
536          }          }
537    
         /* Third case: insufficent stats data */  
         if (data->frame_num >= rc->num_frames)  
                 return 0;  
   
         /*  
          * The last case is the one every normal minded developer should fear to  
          * maintain in a project :-)  
          */  
   
         /* XXX: why by 8 */  
         overflow = rc->overflow / 8;  
538    
539          /*          /*************************************************************************/
540           * The rc->overflow field represents the overflow in current scene (between two          /*************************************************************************/
541           * IFrames) so we must not forget to reset it if we are entering a new scene          /*************************************************************************/
          */  
         if (s->type == XVID_TYPE_IVOP)  
                 overflow = 0;  
542    
543          desired = s->scaled_length;          /*-------------------------------------------------------------------------
544             * Frame bit allocation first part
545             *
546             * First steps apply user settings, just like it is done in the theoritical
547             * scaled_curve_apply_advanced_parameters
548             *-----------------------------------------------------------------------*/
549    
550          dbytes = desired;          /* Set desired to what we are wanting to obtain for this frame */
551          if (s->type == XVID_TYPE_IVOP)          dbytes = (double)s->scaled_length;
                 dbytes += desired * rc->param.keyframe_boost / 100;  
         dbytes /= rc->movie_curve;  
552    
553          /*          /* IFrame user settings*/
554           * We are now entering in the hard part of the algo, it was first designed          if (s->type == XVID_TYPE_IVOP) {
555           * to work with i/pframes only streams, so the way it computes things is                  /* Keyframe boosting -- All keyframes benefit from it */
556           * adapted to pframes only. However we can use it if we just take care to                  dbytes += dbytes*rc->param.keyframe_boost / 100;
          * scale the bframes sizes to pframes sizes using the ratio avg_p/avg_p and  
          * then before really using values depending on frame sizes, scaling the  
          * value again with the inverse ratio  
          */  
         if (s->type == XVID_TYPE_BVOP)  
                 dbytes *= rc->avg_length[XVID_TYPE_PVOP-1] / rc->avg_length[XVID_TYPE_BVOP-1];  
557    
558          /*  #if 0 /* ToDo: decide how to apply kfthresholding */
559           * Apply user's choosen Payback method. Payback helps bitrate to follow the  #endif
          * scaled curve "paying back" past errors in curve previsions.  
          */  
         if (rc->param.payback_method == XVID_PAYBACK_BIAS) {  
                 desired = (int)(rc->curve_comp_error / rc->param.bitrate_payback_delay);  
560          } else {          } else {
                 desired = (int)(rc->curve_comp_error * dbytes /  
                                                 rc->avg_length[XVID_TYPE_PVOP-1] / rc->param.bitrate_payback_delay);  
561    
562                  if (labs(desired) > fabs(rc->curve_comp_error)) {                  /* P/S/B frames must reserve some bits for iframe boosting */
563                          desired = (int)rc->curve_comp_error;                  dbytes *= rc->pb_iboost_tax_ratio;
564    
565                    /* Apply assymetric curve compression */
566                    if (rc->param.curve_compression_high || rc->param.curve_compression_low) {
567                            double assymetric_delta;
568    
569                            /* Compute the assymetric delta, this is computed before applying
570                             * the tax, as done in the pre_process function */
571                            if (dbytes > rc->avg_length[s->type-1])
572                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_high / 100.0;
573                            else
574                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_low  / 100.0;
575    
576                            /* Now we must apply the assymetric tax, else our curve compression
577                             * would not give a theoritical target size equal to what it is
578                             * expected */
579                            dbytes *= rc->assymetric_tax_ratio;
580    
581                            /* Now we can add the assymetric delta */
582                            dbytes += assymetric_delta;
583                  }                  }
584          }          }
585    
586          rc->curve_comp_error -= desired;          /* That is what we would like to have -- Don't put that chunk after
587             * overflow control, otherwise, overflow is counted twice and you obtain
588             * half sized bitrate sequences */
589            s->desired_length  = (int)dbytes;
590            rc->desired_total += dbytes;
591    
592          /* XXX: warning */          /*------------------------------------------------------------------------
593          curve_temp = 0;           * Frame bit allocation: overflow control part.
594             *
595             * Unlike the theoritical scaled_curve_apply_advanced_parameters, here
596             * it's real encoding and we need to make sure we don't go so far from
597             * what is our ideal scaled curve.
598             *-----------------------------------------------------------------------*/
599    
600            /* Compute the overflow we should compensate */
601            if (s->type != XVID_TYPE_IVOP || rc->overflow > 0) {
602                    double frametype_factor;
603                    double framesize_factor;
604    
605          if ((rc->param.curve_compression_high + rc->param.curve_compression_low) &&     s->type != XVID_TYPE_IVOP) {                  /* Take only the desired part of overflow */
606                    overflow = rc->overflow;
607    
608                  curve_temp = rc->curve_comp_scale;                  /* Factor that will take care to decrease the overflow applied
609                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                   * according to the importance of this frame type in term of
610                          curve_temp *= ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_high / 100.0);                   * overall size */
611                  } else {                  frametype_factor  = rc->count[XVID_TYPE_IVOP-1]*rc->avg_length[XVID_TYPE_IVOP-1];
612                          curve_temp *= ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_low / 100.0);                  frametype_factor += rc->count[XVID_TYPE_PVOP-1]*rc->avg_length[XVID_TYPE_PVOP-1];
613                  }                  frametype_factor += rc->count[XVID_TYPE_BVOP-1]*rc->avg_length[XVID_TYPE_BVOP-1];
614                    frametype_factor /= rc->count[s->type-1]*rc->avg_length[s->type-1];
615                    frametype_factor  = 1/frametype_factor;
616    
617                    /* Factor that will take care not to compensate too much for this frame
618                     * size */
619                    framesize_factor  = dbytes;
620                    framesize_factor /= rc->avg_length[s->type-1];
621    
622                  /*                  /* Treat only the overflow part concerned by this frame type and size */
623                   * End of code path for curve_temp, as told earlier, we are now                  overflow *= frametype_factor;
624                   * obliged to scale the value to a bframe one using the inverse  #if 0
625                   * ratio applied earlier                  /* Leave this one alone, as it impacts badly on quality */
626                   */                  overflow *= framesize_factor;
627                  if (s->type == XVID_TYPE_BVOP)  #endif
                         curve_temp *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
628    
629                  desired += (int)curve_temp;                  /* Apply the overflow strength imposed by the user */
630                  rc->curve_comp_error += curve_temp - (int)curve_temp;                  overflow *= (rc->param.overflow_control_strength/100.0f);
631          } else {          } else {
632                  /*                  /* no negative overflow applied in IFrames because:
633                   * End of code path for dbytes, as told earlier, we are now                   *  - their role is important as they're references for P/BFrames.
634                   * obliged to scale the value to a bframe one using the inverse                   *  - there aren't much in typical sequences, so if an IFrame overflows too
635                   * ratio applied earlier                   *    much, this overflow may impact the next IFrame too much and generate
636                   */                   *    a sequence of poor quality frames */
637                  if (s->type == XVID_TYPE_BVOP)                  overflow = 0;
                         dbytes *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
   
                 desired += (int)dbytes;  
                 rc->curve_comp_error += dbytes - (int)dbytes;  
638          }          }
639    
640            /* Make sure we are not trying to compensate more overflow than we even have */
641            if (fabs(overflow) > fabs(rc->overflow))
642                    overflow = rc->overflow;
643    
644          /*          /* Make sure the overflow doesn't make the frame size to get out of the range
645           * We can't do bigger frames than first pass, this would be stupid as first           * [-max_degradation..+max_improvment] */
646           * pass is quant=2 and that reaching quant=1 is not worth it. We would lose          if (overflow > dbytes*rc->param.max_overflow_improvement / 100) {
647           * many bytes and we would not not gain much quality.                  if(overflow <= dbytes)
648           */                          dbytes += dbytes * rc->param.max_overflow_improvement / 100;
649          if (desired > s->length) {                  else
650                  rc->curve_comp_error += desired - s->length;                          dbytes += overflow * rc->param.max_overflow_improvement / 100;
651                  desired = s->length;          } else if (overflow < - dbytes * rc->param.max_overflow_degradation / 100) {
652                    dbytes -= dbytes * rc->param.max_overflow_degradation / 100;
653          } else {          } else {
654                  if (desired < rc->min_length[s->type-1]) {                  dbytes += overflow;
                         if (s->type == XVID_TYPE_IVOP){  
                                 rc->curve_comp_error -= rc->min_length[XVID_TYPE_IVOP-1] - desired;  
                         }  
                         desired = rc->min_length[s->type-1];  
655                  }                  }
         }  
   
         s->desired_length = desired;  
   
   
         /*  
          * if this keyframe is too close to the next, reduce it's byte allotment  
          * XXX: why do we do this after setting the desired length ?  
          */  
   
         if (s->type == XVID_TYPE_IVOP) {  
                 int KFdistance = rc->keyframe_locations[rc->KF_idx] - rc->keyframe_locations[rc->KF_idx - 1];  
656    
657                  if (KFdistance < rc->param.kftreshold) {          /*-------------------------------------------------------------------------
658             * Frame bit allocation last part:
659             *
660             * Cap frame length so we don't reach neither bigger frame sizes than first
661             * pass nor smaller than the allowed minimum.
662             *-----------------------------------------------------------------------*/
663    
664    #ifdef PASS_SMALLER
665            if (dbytes > s->length) {
666                    dbytes = s->length;
667            }
668    #endif
669    
670                          KFdistance -= rc->param.min_key_interval;          /* Prevent stupid desired sizes under logical values */
671            if (dbytes < rc->min_length[s->type-1]) {
672                    dbytes = rc->min_length[s->type-1];
673            }
674    
675                          if (KFdistance >= 0) {          /*------------------------------------------------------------------------
676                                  int KF_min_size;           * Desired frame length <-> quantizer mapping
677             *-----------------------------------------------------------------------*/
678    
679                                  KF_min_size = desired * (100 - rc->param.kfreduction) / 100;  #ifdef BQUANT_PRESCALE
680                                  if (KF_min_size < 1)          /* For bframes we prescale the quantizer to avoid too high quant scaling */
681                                          KF_min_size = 1;          if(s->type == XVID_TYPE_BVOP) {
682    
683                                  desired = KF_min_size + (desired - KF_min_size) * KFdistance /                  twopass_stat_t *b_ref = s;
                                         (rc->param.kftreshold - rc->param.min_key_interval);  
684    
685                                  if (desired < 1)                  /* Find the reference frame */
686                                          desired = 1;                  while(b_ref != &rc->stats[0] && b_ref->type == XVID_TYPE_BVOP)
687                          }                          b_ref--;
688    
689                    /* Compute the original quant */
690                    s->quant  = 2*(100*s->quant - data->bquant_offset);
691                    s->quant += data->bquant_ratio - 1; /* to avoid rounding issues */
692                    s->quant  = s->quant/data->bquant_ratio - b_ref->quant;
693                  }                  }
694          }  #endif
   
         overflow = (int)((double)overflow * desired / rc->avg_length[XVID_TYPE_PVOP-1]);  
   
         /* Reign in overflow with huge frames */  
         if (labs(overflow) > labs(rc->overflow))  
                 overflow = rc->overflow;  
695    
696          /* Make sure overflow doesn't run away */          /* Don't laugh at this very 'simple' quant<->size relationship, it
697          if (overflow > desired * rc->param.max_overflow_improvement / 100) {           * proves to be acurate enough for our algorithm */
698                  desired += (overflow <= desired) ? desired * rc->param.max_overflow_improvement / 100 :          scaled_quant = (double)s->quant*(double)s->length/(double)dbytes;
699                          overflow * rc->param.max_overflow_improvement / 100;  
700          } else if (overflow < desired * rc->param.max_overflow_degradation / -100){  #ifdef COMPENSATE_FORMULA
701                  desired += desired * rc->param.max_overflow_degradation / -100;          /* We know xvidcore will apply the bframe formula again, so we compensate
702          } else {           * it right now to make sure we would not apply it twice */
703                  desired += overflow;          if(s->type == XVID_TYPE_BVOP) {
         }  
704    
705          /* 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);  
         }  
706    
707          /* Make sure to not scale below the minimum framesize */                  /* Find the reference frame */
708          if (desired < rc->min_length[s->type-1]) {                  while(b_ref != &rc->stats[0] && b_ref->type == XVID_TYPE_BVOP)
709                  desired = rc->min_length[s->type-1];                          b_ref--;
710                  DPRINTF(XVID_DEBUG_RC,"[%i] Capped to minimum frame size\n",  
711                                  data->frame_num);                  /* Compute the quant it would be if the core did not apply the bframe
712                     * formula */
713                    scaled_quant  = 100*scaled_quant - data->bquant_offset;
714                    scaled_quant += data->bquant_ratio - 1; /* to avoid rouding issues */
715                    scaled_quant /= data->bquant_ratio;
716          }          }
717    #endif
718    
719          /*          /* Quantizer has been scaled using floating point operations/results, we
720           * Don't laugh at this very 'simple' quant<->filesize relationship, it           * must cast it to integer */
          * proves to be acurate enough for our algorithm  
          */  
         scaled_quant = (double)s->quant*(double)s->length/(double)desired;  
   
         /*  
          * Quantizer has been scaled using floating point operations/results, we  
          * must cast it to integer  
          */  
721          data->quant = (int)scaled_quant;          data->quant = (int)scaled_quant;
722    
723          /* Let's clip the computed quantizer, if needed */          /* Let's clip the computed quantizer, if needed */
# Line 539  Line 725 
725                  data->quant = 1;                  data->quant = 1;
726          } else if (data->quant > 31) {          } else if (data->quant > 31) {
727                  data->quant = 31;                  data->quant = 31;
728          } else if (s->type != XVID_TYPE_IVOP) {          } else {
729    
730                  /*                  /* The frame quantizer has not been clipped, this appears to be a good
                  * The frame quantizer has not been clipped, this appears to be a good  
731                   * computed quantizer, do not loose quantizer decimal part that we                   * computed quantizer, do not loose quantizer decimal part that we
732                   * accumulate for later reuse when its sum represents a complete unit.                   * accumulate for later reuse when its sum represents a complete
733                   */                   * unit. */
734                  rc->quant_error[s->type-1][data->quant] += scaled_quant - (double)data->quant;                  rc->quant_error[s->type-1][data->quant] += scaled_quant - (double)data->quant;
735    
736                  if (rc->quant_error[s->type-1][data->quant] >= 1.0) {                  if (rc->quant_error[s->type-1][data->quant] >= 1.0) {
# Line 555  Line 740 
740                          rc->quant_error[s->type-1][data->quant] += 1.0;                          rc->quant_error[s->type-1][data->quant] += 1.0;
741                          data->quant--;                          data->quant--;
742                  }                  }
   
743          }          }
744    
745          /*          /* 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  
746           * possible +1 correction due to cumulated error. We can now safely clip           * possible +1 correction due to cumulated error. We can now safely clip
747           * the quantizer again with user's quant ranges. "Safely" means the Rate           * the quantizer again with user's quant ranges. "Safely" means the Rate
748           * Control could learn more about this quantizer, this knowledge is useful           * Control could learn more about this quantizer, this knowledge is useful
749           * 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,
750           * that's why we don't perform this clipping earlier.           * that's why we don't perform this clipping earlier. */
          */  
751          if (data->quant < data->min_quant[s->type-1]) {          if (data->quant < data->min_quant[s->type-1]) {
752                  data->quant = data->min_quant[s->type-1];                  data->quant = data->min_quant[s->type-1];
753          } else if (data->quant > data->max_quant[s->type-1]) {          } else if (data->quant > data->max_quant[s->type-1]) {
754                  data->quant = data->max_quant[s->type-1];                  data->quant = data->max_quant[s->type-1];
755          }          }
756    
757          /*          if (data->quant < rc->min_quant) data->quant = rc->min_quant;
758           * To avoid big quality jumps from frame to frame, we apply a "security"  
759            /* To avoid big quality jumps from frame to frame, we apply a "security"
760           * rule that makes |last_quant - new_quant| <= 2. This rule only applies           * rule that makes |last_quant - new_quant| <= 2. This rule only applies
761           * to predicted frames (P and B)           * to predicted frames (P and B) */
          */  
762          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) {
763    
764                  if (data->quant > rc->last_quant[s->type-1] + 2) {                  if (data->quant > rc->last_quant[s->type-1] + 2) {
765                          data->quant = rc->last_quant[s->type-1] + 2;                          data->quant = rc->last_quant[s->type-1] + 2;
766                          DPRINTF(XVID_DEBUG_RC,                          DPRINTF(XVID_DEBUG_RC,
767                                          "[%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",
768                                          data->frame_num);                                          data->frame_num);
769                  }                  }
770                  if (data->quant < rc->last_quant[s->type-1] - 2) {                  if (data->quant < rc->last_quant[s->type-1] - 2) {
771                          data->quant = rc->last_quant[s->type-1] - 2;                          data->quant = rc->last_quant[s->type-1] - 2;
772                          DPRINTF(XVID_DEBUG_RC,                          DPRINTF(XVID_DEBUG_RC,
773                                          "[%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",
774                                          data->frame_num);                                          data->frame_num);
775                  }                  }
776          }          }
777    
778          /*          /* We don't want to pollute the RC histerisis when our computed quant has
779           * We don't want to pollute the RC history results when our computed quant           * been computed from a capped frame size */
          * has been computed from a capped frame size  
          */  
780          if (capped_to_max_framesize == 0)          if (capped_to_max_framesize == 0)
781                  rc->last_quant[s->type-1] = data->quant;                  rc->last_quant[s->type-1] = data->quant;
782    
783            /* Don't forget to force 1st pass frame type ;-) */
784            data->type = s->type;
785    
786          return 0;          return 0;
787  }  }
788    
# Line 610  Line 793 
793  rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)  rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)
794  {  {
795          const char frame_type[4] = { 'i', 'p', 'b', 's'};          const char frame_type[4] = { 'i', 'p', 'b', 's'};
796          stat_t * s = &rc->stats[data->frame_num];          twopass_stat_t * s = &rc->stats[data->frame_num];
797    
798          /* Insufficent stats data */          /* Insufficent stats data */
799      if (data->frame_num >= rc->num_frames)      if (data->frame_num >= rc->num_frames)
800          return 0;          return 0;
801    
802      rc->quant_count[data->quant]++;          /* Update the quantizer counter */
803            rc->quant_count[s->type-1][data->quant]++;
804    
805            /* Update the frame type overflow */
806      if (data->type == XVID_TYPE_IVOP) {      if (data->type == XVID_TYPE_IVOP) {
807          int kfdiff = (rc->keyframe_locations[rc->KF_idx] -      rc->keyframe_locations[rc->KF_idx - 1]);                  int kfdiff = 0;
808    
809                    if(rc->KF_idx != rc->num_frames -1) {
810                            kfdiff  = rc->keyframe_locations[rc->KF_idx+1];
811                            kfdiff -= rc->keyframe_locations[rc->KF_idx];
812                    }
813    
814                    /* Flush Keyframe overflow accumulator */
815          rc->overflow += rc->KFoverflow;          rc->overflow += rc->KFoverflow;
816    
817                    /* Store the frame overflow to the keyframe accumulator */
818          rc->KFoverflow = s->desired_length - data->length;          rc->KFoverflow = s->desired_length - data->length;
819    
820          if (kfdiff > 1) {  // non-consecutive keyframes                  if (kfdiff > 1) {
821                            /* Non-consecutive keyframes case:
822                             * We can then divide this total keyframe overflow into equal parts
823                             * that we will distribute into regular overflow at each frame
824                             * between the sequence bounded by two IFrames */
825              rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);              rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);
826          }else{ // consecutive keyframes                  } else {
827                            /* Consecutive keyframes case:
828                             * Flush immediatly the keyframe overflow and reset keyframe
829                             * overflow */
830                          rc->overflow += rc->KFoverflow;                          rc->overflow += rc->KFoverflow;
831                          rc->KFoverflow = 0;                          rc->KFoverflow = 0;
832                          rc->KFoverflow_partial = 0;                          rc->KFoverflow_partial = 0;
833          }          }
834          rc->KF_idx++;          rc->KF_idx++;
835      } else {      } else {
836          // distribute part of the keyframe overflow                  /* Accumulate the frame overflow */
837          rc->overflow += s->desired_length - data->length + rc->KFoverflow_partial;                  rc->overflow += s->desired_length - data->length;
838    
839                    /* Distribute part of the keyframe overflow */
840                    rc->overflow += rc->KFoverflow_partial;
841    
842                    /* Don't forget to substract that same amount from the total keyframe
843                     * overflow */
844          rc->KFoverflow -= rc->KFoverflow_partial;          rc->KFoverflow -= rc->KFoverflow_partial;
845      }      }
846    
847          DPRINTF(XVID_DEBUG_RC, "[%i] type:%c quant:%i stats1:%i scaled:%i actual:%i desired:%d overflow:%i\n",          rc->overflow += (s->error = s->desired_length - data->length);
848            rc->real_total += data->length;
849    
850            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",
851                          data->frame_num,                          data->frame_num,
852                          frame_type[data->type-1],                          frame_type[data->type-1],
853                          data->quant,                          data->quant,
854                          s->length,                          s->length,
855                          s->scaled_length,                          s->scaled_length,
                         data->length,  
856                          s->desired_length,                          s->desired_length,
857                            s->desired_length - s->error,
858                            -s->error,
859                          rc->overflow);                          rc->overflow);
860    
861      return(0);      return(0);
# Line 655  Line 865 
865   * Helper functions definition   * Helper functions definition
866   ****************************************************************************/   ****************************************************************************/
867    
868    /* Default buffer size for reading lines */
869  #define BUF_SZ   1024  #define BUF_SZ   1024
 #define MAX_COLS 5  
870    
871  /* open stats file, and count num frames */  /* Helper functions for reading/parsing the stats file */
872    static char *skipspaces(char *string);
873    static int iscomment(char *string);
874    static char *readline(FILE *f);
875    
876    /* This function counts the number of frame entries in the stats file
877     * It also counts the number of I Frames */
878  static int  static int
879  det_stats_length(rc_2pass2_t * rc, char * filename)  statsfile_count_frames(rc_2pass2_t * rc, char * filename)
880  {  {
881      FILE * f;      FILE * f;
882      int n, ignore;          char *line;
883      char type;          int lines;
884    
885      rc->num_frames = 0;      rc->num_frames = 0;
886      rc->num_keyframes = 0;      rc->num_keyframes = 0;
887    
888      if ((f = fopen(filename, "rt")) == NULL)          if ((f = fopen(filename, "rb")) == NULL)
889          return 0;                  return(-1);
890    
891      while((n = fscanf(f, "%c %d %d %d %d %d %d\n",          lines = 0;
892          &type, &ignore, &ignore, &ignore, &ignore, &ignore, &ignore)) != EOF) {          while ((line = readline(f)) != NULL) {
893          if (type == 'i') {  
894              rc->num_frames++;                  char *ptr;
895                    char type;
896                    int fields;
897    
898                    lines++;
899    
900                    /* We skip spaces */
901                    ptr = skipspaces(line);
902    
903                    /* Skip coment lines or empty lines */
904                    if(iscomment(ptr) || *ptr == '\0') {
905                            free(line);
906                            continue;
907                    }
908    
909                    /* Read the stat line from buffer */
910                    fields = sscanf(ptr, "%c", &type);
911    
912                    /* Valid stats files have at least 7 fields */
913                    if (fields == 1) {
914                            switch(type) {
915                            case 'i':
916                            case 'I':
917              rc->num_keyframes++;              rc->num_keyframes++;
918          }else if (type == 'p' || type == 'b' || type == 's') {                          case 'p':
919                            case 'P':
920                            case 'b':
921                            case 'B':
922                            case 's':
923                            case 'S':
924              rc->num_frames++;              rc->num_frames++;
925                                    break;
926                            default:
927                                    DPRINTF(XVID_DEBUG_RC,
928                                                    "[xvid rc] -- WARNING: L%d unknown frame type used (%c).\n",
929                                                    lines, type);
930          }          }
931                    } else {
932                                    DPRINTF(XVID_DEBUG_RC,
933                                                    "[xvid rc] -- WARNING: L%d misses some stat fields (%d).\n",
934                                                    lines, 7-fields);
935      }      }
936    
937                    /* Free the line buffer */
938                    free(line);
939            }
940    
941            /* We are done with the file */
942      fclose(f);      fclose(f);
943    
944      return 1;          return(0);
945  }  }
946    
947  /* open stats file(s) and read into rc->stats array */  /* open stats file(s) and read into rc->stats array */
   
948  static int  static int
949  load_stats(rc_2pass2_t *rc, char * filename)  statsfile_load(rc_2pass2_t *rc, char * filename)
950  {  {
951      FILE * f;      FILE * f;
952      int i, not_scaled;          int processed_entries;
953    
954            /* Opens the file */
955            if ((f = fopen(filename, "rb"))==NULL)
956                    return(-1);
957    
958      if ((f = fopen(filename, "rt"))==NULL)          processed_entries = 0;
959          return 0;          while(processed_entries < rc->num_frames) {
   
     i = 0;  
         not_scaled = 0;  
     while(i < rc->num_frames) {  
         stat_t * s = &rc->stats[i];  
         int n;  
960          char type;          char type;
961                    int fields;
962                    twopass_stat_t * s = &rc->stats[processed_entries];
963                    char *line, *ptr;
964    
965                    /* Read the line from the file */
966                    if((line = readline(f)) == NULL)
967                            break;
968    
969                    /* We skip spaces */
970                    ptr = skipspaces(line);
971    
972                    /* Skip comment lines or empty lines */
973                    if(iscomment(ptr) || *ptr == '\0') {
974                            free(line);
975                            continue;
976                    }
977    
978                    /* Reset this field that is optional */
979                  s->scaled_length = 0;                  s->scaled_length = 0;
         n = fscanf(f, "%c %d %d %d %d %d %d\n", &type, &s->quant, &s->blks[0], &s->blks[1], &s->blks[2], &s->length, &s->scaled_length);  
         if (n == EOF) break;  
                 if (n < 7) {  
                         not_scaled = 1;  
                 }  
980    
981          if (type == 'i') {                  /* Convert the fields */
982                    fields = sscanf(ptr,
983                                                    "%c %d %d %d %d %d %d %d\n",
984                                                    &type,
985                                                    &s->quant,
986                                                    &s->blks[0], &s->blks[1], &s->blks[2],
987                                                    &s->length, &s->invariant /* not really yet */,
988                                                    &s->scaled_length);
989    
990                    /* Free line buffer, we don't need it anymore */
991                    free(line);
992    
993                    /* Fail silently, this has probably been warned in
994                     * statsfile_count_frames */
995                    if(fields != 7 && fields != 8)
996                            continue;
997    
998                    /* Convert frame type and compute the invariant length part */
999                    switch(type) {
1000                    case 'i':
1001                    case 'I':
1002              s->type = XVID_TYPE_IVOP;              s->type = XVID_TYPE_IVOP;
1003          }else if (type == 'p' || type == 's') {                          s->invariant /= INVARIANT_HEADER_PART_IVOP;
1004                            break;
1005                    case 'p':
1006                    case 'P':
1007                    case 's':
1008                    case 'S':
1009              s->type = XVID_TYPE_PVOP;              s->type = XVID_TYPE_PVOP;
1010          }else if (type == 'b') {                          s->invariant /= INVARIANT_HEADER_PART_PVOP;
1011                            break;
1012                    case 'b':
1013                    case 'B':
1014              s->type = XVID_TYPE_BVOP;              s->type = XVID_TYPE_BVOP;
1015          }else{  /* unknown type */                          s->invariant /= INVARIANT_HEADER_PART_BVOP;
1016              DPRINTF(XVID_DEBUG_RC, "unknown stats frame type; assuming pvop\n");                          break;
1017              s->type = XVID_TYPE_PVOP;                  default:
1018                            /* Same as before, fail silently */
1019                            continue;
1020          }          }
1021    
1022          i++;                  /* Ok it seems it's been processed correctly */
1023                    processed_entries++;
1024      }      }
1025    
1026      rc->num_frames = i;          /* Close the file */
   
1027          fclose(f);          fclose(f);
1028    
1029      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);  
     }  
1030  }  }
 #endif  
1031    
1032  /* pre-process the statistics data  /* pre-process the statistics data
1033      - for each type, count, tot_length, min_length, max_length   * - for each type, count, tot_length, min_length, max_length
1034      - set keyframes_locations   * - set keyframes_locations, tot_prescaled */
 */  
   
1035  static void  static void
1036  pre_process0(rc_2pass2_t * rc)  first_pass_stats_prepare_data(rc_2pass2_t * rc)
1037  {  {
1038      int i,j;      int i,j;
1039    
1040          /*          /* *rc fields initialization
          * *rc fields initialization  
1041           * NB: INT_MAX and INT_MIN are used in order to be immediately replaced           * NB: INT_MAX and INT_MIN are used in order to be immediately replaced
1042           *     with real values of the 1pass           *     with real values of the 1pass */
          */  
1043           for (i=0; i<3; i++) {           for (i=0; i<3; i++) {
1044                  rc->count[i]=0;                  rc->count[i]=0;
1045                  rc->tot_length[i] = 0;                  rc->tot_length[i] = 0;
1046                    rc->tot_invariant[i] = 0;
1047                  rc->min_length[i] = INT_MAX;                  rc->min_length[i] = INT_MAX;
1048      }      }
1049    
1050          rc->max_length = INT_MIN;          rc->max_length = INT_MIN;
1051            rc->tot_weighted = 0;
1052    
1053          /*          /* Loop through all frames and find/compute all the stuff this function
1054           * Loop through all frames and find/compute all the stuff this function           * is supposed to do */
          * is supposed to do  
          */  
1055          for (i=j=0; i<rc->num_frames; i++) {          for (i=j=0; i<rc->num_frames; i++) {
1056                  stat_t * s = &rc->stats[i];                  twopass_stat_t * s = &rc->stats[i];
1057    
1058                  rc->count[s->type-1]++;                  rc->count[s->type-1]++;
1059                  rc->tot_length[s->type-1] += s->length;                  rc->tot_length[s->type-1] += s->length;
1060                    rc->tot_invariant[s->type-1] += s->invariant;
1061                    if (s->zone_mode != XVID_ZONE_QUANT)
1062                            rc->tot_weighted += (int)(s->weight*(s->length - s->invariant));
1063    
1064                  if (s->length < rc->min_length[s->type-1]) {                  if (s->length < rc->min_length[s->type-1]) {
1065                          rc->min_length[s->type-1] = s->length;                          rc->min_length[s->type-1] = s->length;
# Line 793  Line 1075 
1075                  }                  }
1076          }          }
1077    
1078          /*          /* NB:
          * Nota Bene:  
1079           * The "per sequence" overflow system considers a natural sequence to be           * The "per sequence" overflow system considers a natural sequence to be
1080           * 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
1081           * 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
1082           * frame to appear in the keyframe locations array.           * frame to appear in the keyframe locations array. */
          */  
1083      rc->keyframe_locations[j] = i;      rc->keyframe_locations[j] = i;
1084    
1085          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]);
1086          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]);
1087          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]);
1088  }  }
1089    
1090  /* calculate zone weight "center" */  /* calculate zone weight "center" */
   
1091  static void  static void
1092  zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)  zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)
1093  {  {
1094      int i,j;      int i,j;
1095      int n = 0;      int n = 0;
1096    
     rc->avg_weight = 0.0;  
1097      rc->tot_quant = 0;      rc->tot_quant = 0;
1098            rc->tot_quant_invariant = 0;
1099    
1100      if (create->num_zones == 0) {      if (create->num_zones == 0) {
1101          for (j = 0; j < rc->num_frames; j++) {          for (j = 0; j < rc->num_frames; j++) {
1102              rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;              rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1103              rc->stats[j].weight = 1.0;              rc->stats[j].weight = 1.0;
1104          }          }
         rc->avg_weight += rc->num_frames * 1.0;  
1105          n += rc->num_frames;          n += rc->num_frames;
1106      }      }
1107    
# Line 833  Line 1110 
1110    
1111          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;
1112    
1113                    /* Zero weight make no sense */
1114                    if (create->zones[i].increment == 0) create->zones[i].increment = 1;
1115                    /* And obviously an undetermined infinite makes even less sense */
1116                    if (create->zones[i].base == 0) create->zones[i].base = 1;
1117    
1118          if (i==0 && create->zones[i].frame > 0) {          if (i==0 && create->zones[i].frame > 0) {
1119              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++) {
1120                  rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;                  rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1121                  rc->stats[j].weight = 1.0;                  rc->stats[j].weight = 1.0;
1122              }              }
             rc->avg_weight += create->zones[i].frame * 1.0;  
1123              n += create->zones[i].frame;              n += create->zones[i].frame;
1124          }          }
1125    
# Line 848  Line 1129 
1129                  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;
1130              }              }
1131              next -= create->zones[i].frame;              next -= create->zones[i].frame;
             rc->avg_weight += (double)(next * create->zones[i].increment) / (double)create->zones[i].base;  
1132              n += next;              n += next;
1133          }else{  // XVID_ZONE_QUANT                  } else{  /* XVID_ZONE_QUANT */
1134              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++ ) {
1135                  rc->stats[j].zone_mode = XVID_ZONE_QUANT;                  rc->stats[j].zone_mode = XVID_ZONE_QUANT;
1136                  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;
1137                  rc->tot_quant += rc->stats[j].length;                  rc->tot_quant += rc->stats[j].length;
1138                                    rc->tot_quant_invariant += rc->stats[j].invariant;
1139              }              }
1140          }          }
1141      }      }
     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);  
1142  }  }
1143    
1144    
1145  /* scale the curve */  /* scale the curve */
   
1146  static void  static void
1147  internal_scale(rc_2pass2_t *rc)  first_pass_scale_curve_internal(rc_2pass2_t *rc)
1148  {  {
1149          int64_t target  = rc->target - rc->tot_quant;          int64_t target;
1150          int64_t pass1_length = rc->tot_length[0] + rc->tot_length[1] + rc->tot_length[2] - rc->tot_quant;          int64_t total_invariant;
1151          double scaler;          double scaler;
1152          int i, num_MBs;          int i, num_MBs;
1153          int min_size[3];  
1154            /* We only scale texture data ! */
1155            total_invariant  = rc->tot_invariant[XVID_TYPE_IVOP-1];
1156            total_invariant += rc->tot_invariant[XVID_TYPE_PVOP-1];
1157            total_invariant += rc->tot_invariant[XVID_TYPE_BVOP-1];
1158            /* don't forget to substract header bytes used in quant zones, otherwise we
1159             * counting them twice */
1160            total_invariant -= rc->tot_quant_invariant;
1161    
1162            /* We remove the bytes used by the fixed quantizer zones during first pass
1163             * with the same quants, so we know very precisely how much that
1164             * represents */
1165            target  = rc->target;
1166            target -= rc->tot_quant;
1167    
1168          /* Let's compute a linear scaler in order to perform curve scaling */          /* Let's compute a linear scaler in order to perform curve scaling */
1169          scaler = (double)target / (double)pass1_length;          scaler = (double)(target - total_invariant) / (double)(rc->tot_weighted);
1170    
1171          if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {  #ifdef SMART_OVERFLOW_SETTING
1172                  DPRINTF(XVID_DEBUG_RC, "WARNING: Undersize detected\n");          if (scaler > 0.9) {
1173          scaler = 1.0;                  rc->param.max_overflow_degradation *= 5;
1174                    rc->param.max_overflow_improvement *= 5;
1175                    rc->param.overflow_control_strength *= 3;
1176            } else if (scaler > 0.6) {
1177                    rc->param.max_overflow_degradation *= 2;
1178                    rc->param.max_overflow_improvement *= 2;
1179                    rc->param.overflow_control_strength *= 2;
1180            } else {
1181                    rc->min_quant = 2;
1182          }          }
1183    #endif
1184    
1185      DPRINTF(XVID_DEBUG_RC,          /* Compute min frame lengths (for each frame type) according to the number
1186                          "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
1187                          (int)target, (int)pass1_length, scaler);           * number of MBs.
1188             *
1189             * We compare these hardcoded values with observed values in first pass
1190             * (determined in pre_process0).Then we keep the real minimum. */
1191    
1192          /*          /* Number of MBs */
1193           * Compute min frame lengths (for each frame type) according to the number          num_MBs  = rc->stats[0].blks[0];
1194           * of MBs. We sum all blocks count from frame 0 (should be an IFrame, so          num_MBs += rc->stats[0].blks[1];
1195           * blocks[0] should be enough) to know how many MBs there are.          num_MBs += rc->stats[0].blks[2];
1196           */  
1197          num_MBs = rc->stats[0].blks[0] + rc->stats[0].blks[1] + rc->stats[0].blks[2];          /* Minimum for I frames */
1198          min_size[0] = ((num_MBs*22) + 240) / 8;          if(rc->min_length[XVID_TYPE_IVOP-1] > ((num_MBs*22) + 240) / 8)
1199          min_size[1] = ((num_MBs)    + 88)  / 8;                  rc->min_length[XVID_TYPE_IVOP-1] = ((num_MBs*22) + 240) / 8;
1200          min_size[2] = 8;  
1201            /* Minimum for P/S frames */
1202            if(rc->min_length[XVID_TYPE_PVOP-1] > ((num_MBs) + 88)  / 8)
1203                    rc->min_length[XVID_TYPE_PVOP-1] = ((num_MBs) + 88)  / 8;
1204    
1205            /* Minimum for B frames */
1206            if(rc->min_length[XVID_TYPE_BVOP-1] > 8)
1207                    rc->min_length[XVID_TYPE_BVOP-1] = 8;
1208    
1209          /*          /* Perform an initial scale pass.
1210           * Perform an initial scale pass.           *
1211           * If a frame size is scaled underneath our hardcoded minimums, then we           * If a frame size is scaled underneath our hardcoded minimums, then we
1212           * force the frame size to the minimum, and deduct the original & scaled           * force the frame size to the minimum, and deduct the original & scaled
1213           * frame length from the original and target total lengths           * frame length from the original and target total lengths */
          */  
1214          for (i=0; i<rc->num_frames; i++) {          for (i=0; i<rc->num_frames; i++) {
1215                  stat_t * s = &rc->stats[i];                  twopass_stat_t * s = &rc->stats[i];
1216                  int len;                  int len;
1217    
1218                    /* No need to scale frame length for which a specific quantizer is
1219                     * specified thanks to zones */
1220          if (s->zone_mode == XVID_ZONE_QUANT) {          if (s->zone_mode == XVID_ZONE_QUANT) {
1221              s->scaled_length = s->length;              s->scaled_length = s->length;
1222                          continue;                          continue;
1223                  }                  }
1224    
1225                  /* Compute the scaled length */                  /* Compute the scaled length -- only non invariant data length is scaled */
1226                  len = (int)((double)s->length * scaler * s->weight / rc->avg_weight);                  len = s->invariant + (int)((double)(s->length-s->invariant) * scaler * s->weight);
1227    
1228                  /* Compare with the computed minimum */                  /* Compare with the computed minimum */
1229                  if (len < min_size[s->type-1]) {                  if (len < rc->min_length[s->type-1]) {
1230                          /* force frame size to our computed minimum */                          /* This is a 'forced size' frame, set its frame size to the
1231                          s->scaled_length = min_size[s->type-1];                           * computed minimum */
1232                            s->scaled_length = rc->min_length[s->type-1];
1233    
1234                            /* Remove both scaled and original size from their respective
1235                             * total counters, as we prepare a second pass for 'regular'
1236                             * frames */
1237                          target -= s->scaled_length;                          target -= s->scaled_length;
                         pass1_length -= s->length;  
1238                  } else {                  } else {
1239                          /* Do nothing for now, we'll scale this later */                          /* Do nothing for now, we'll scale this later */
1240                          s->scaled_length = 0;                          s->scaled_length = 0;
1241                  }                  }
1242          }          }
1243    
1244          /* Correct the scaler for all non forced frames */          /* The first pass on data substracted all 'forced size' frames from the
1245          scaler = (double)target / (double)pass1_length;           * total counters. Now, it's possible to scale the 'regular' frames. */
1246    
1247          /* Detect undersizing */          /* Scaling factor for 'regular' frames */
1248      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);  
1249    
1250          /* Do another pass with the new scaler */          /* Do another pass with the new scaler */
1251          for (i=0; i<rc->num_frames; i++) {          for (i=0; i<rc->num_frames; i++) {
1252                  stat_t * s = &rc->stats[i];                  twopass_stat_t * s = &rc->stats[i];
1253    
1254                  /* Ignore frame with forced frame sizes */                  /* Ignore frame with forced frame sizes */
1255                  if (s->scaled_length == 0)                  if (s->scaled_length == 0)
1256                          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);
1257          }          }
1258    
1259            /* Job done */
1260            return;
1261  }  }
1262    
1263    /* Apply all user settings to the scaled curve
1264     * This implies:
1265     *   keyframe boosting
1266     *   high/low compression */
1267  static void  static void
1268  pre_process1(rc_2pass2_t * rc)  scaled_curve_apply_advanced_parameters(rc_2pass2_t * rc)
1269  {  {
1270      int i;      int i;
1271      double total1, total2;          int64_t ivop_boost_total;
     uint64_t ivop_boost_total;  
1272    
1273      ivop_boost_total = 0;          /* Reset the rate controller (per frame type) total byte counters */
1274      rc->curve_comp_error = 0;          for (i=0; i<3; i++) rc->tot_scaled_length[i] = 0;
1275    
1276      for (i=0; i<3; i++) {          /* Compute total bytes for each frame type */
1277          rc->tot_scaled_length[i] = 0;          for (i=0; i<rc->num_frames;i++) {
1278                    twopass_stat_t *s = &rc->stats[i];
1279                    rc->tot_scaled_length[s->type-1] += s->scaled_length;
1280      }      }
1281    
1282            /* First we compute the total amount of bits needed, as being described by
1283             * the scaled distribution. During this pass over the complete stats data,
1284             * we see how much bits two user settings will get/give from/to p&b frames:
1285             *  - keyframe boosting
1286             *  - keyframe distance penalty */
1287            rc->KF_idx = 0;
1288            ivop_boost_total = 0;
1289      for (i=0; i<rc->num_frames; i++) {      for (i=0; i<rc->num_frames; i++) {
1290          stat_t * s = &rc->stats[i];                  twopass_stat_t * s = &rc->stats[i];
   
         rc->tot_scaled_length[s->type-1] += s->scaled_length;  
1291    
1292                    /* Some more work is needed for I frames */
1293          if (s->type == XVID_TYPE_IVOP) {          if (s->type == XVID_TYPE_IVOP) {
1294              ivop_boost_total += s->scaled_length * rc->param.keyframe_boost / 100;                          int ivop_boost;
1295    
1296                            /* Accumulate bytes needed for keyframe boosting */
1297                            ivop_boost = s->scaled_length*rc->param.keyframe_boost/100;
1298    
1299    #if 0 /* ToDo: decide how to apply kfthresholding */
1300    #endif
1301                            /* If the frame size drops under the minimum length, then cap ivop_boost */
1302                            if (ivop_boost + s->scaled_length < rc->min_length[XVID_TYPE_IVOP-1])
1303                                    ivop_boost = rc->min_length[XVID_TYPE_IVOP-1] - s->scaled_length;
1304    
1305                            /* Accumulate the ivop boost */
1306                            ivop_boost_total += ivop_boost;
1307    
1308                            /* Don't forget to update the keyframe index */
1309                            rc->KF_idx++;
1310          }          }
1311      }      }
1312    
1313      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
1314                                          (rc->tot_scaled_length[XVID_TYPE_PVOP-1] + rc->tot_scaled_length[XVID_TYPE_BVOP-1]));           *
1315             * This ratio has to be applied to p/b/s frames in order to reserve
1316             * additional bits for keyframes (keyframe boosting) or if too much
1317             * keyframe distance is applied, bits retrieved from the keyframes.
1318             *
1319             * ie pb_length *= rc->pb_iboost_tax_ratio;
1320             *
1321             *    gives the ideal length of a p/b frame */
1322    
1323            /* Compute the total length of p/b/s frames (temporary storage into
1324             * movie_curve) */
1325            rc->pb_iboost_tax_ratio  = (double)rc->tot_scaled_length[XVID_TYPE_PVOP-1];
1326            rc->pb_iboost_tax_ratio += (double)rc->tot_scaled_length[XVID_TYPE_BVOP-1];
1327    
1328            /* Compute the ratio described above
1329             *     taxed_total = sum(0, n, tax*scaled_length)
1330             * <=> taxed_total = tax.sum(0, n, scaled_length)
1331             * <=> tax = taxed_total / original_total */
1332            rc->pb_iboost_tax_ratio =
1333                    (rc->pb_iboost_tax_ratio - ivop_boost_total) /
1334                    rc->pb_iboost_tax_ratio;
1335    
1336            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- IFrame boost tax ratio:%.2f\n",
1337                            rc->pb_iboost_tax_ratio);
1338    
1339            /* Compute the average size of frames per frame type */
1340      for(i=0; i<3; i++) {      for(i=0; i<3; i++) {
1341          if (rc->count[i] == 0 || rc->movie_curve == 0) {                  /* Special case for missing type or weird case */
1342                    if (rc->count[i] == 0 || rc->pb_iboost_tax_ratio == 0) {
1343              rc->avg_length[i] = 1;              rc->avg_length[i] = 1;
1344          }else{          }else{
1345              rc->avg_length[i] = rc->tot_scaled_length[i] / rc->count[i] / rc->movie_curve;                          rc->avg_length[i] = rc->tot_scaled_length[i];
1346          }  
1347                            if (i == (XVID_TYPE_IVOP-1)) {
1348                                    /* I Frames total has to be added the boost total */
1349                                    rc->avg_length[i] += ivop_boost_total;
1350                            } else {
1351                                    /* P/B frames has to taxed */
1352                                    rc->avg_length[i] *= rc->pb_iboost_tax_ratio;
1353      }      }
1354    
1355      /* --- */                          /* Finally compute the average frame size */
1356                            rc->avg_length[i] /= (double)rc->count[i];
1357                    }
1358            }
1359    
1360      total1=total2=0;          /* Assymetric curve compression */
1361            if (rc->param.curve_compression_high || rc->param.curve_compression_low) {
1362                    double symetric_total;
1363                    double assymetric_delta_total;
1364    
1365                    /* Like I frame boosting, assymetric curve compression modifies the total
1366                     * amount of needed bits, we must compute the ratio so we can prescale
1367                     lengths */
1368                    symetric_total = 0;
1369                    assymetric_delta_total = 0;
1370      for (i=0; i<rc->num_frames; i++) {      for (i=0; i<rc->num_frames; i++) {
1371          stat_t * s = &rc->stats[i];                          double assymetric_delta;
1372                            double dbytes;
1373                            twopass_stat_t * s = &rc->stats[i];
1374    
1375                            /* I Frames are not concerned by assymetric scaling */
1376                            if (s->type == XVID_TYPE_IVOP)
1377                                    continue;
1378    
1379          if (s->type != XVID_TYPE_IVOP) {                          /* During the real run, we would have to apply the iboost tax */
1380              double dbytes,dbytes2;                          dbytes = s->scaled_length * rc->pb_iboost_tax_ratio;
1381    
1382              dbytes = s->scaled_length / rc->movie_curve;                          /* Update the symmetric curve compression total */
1383              dbytes2 = 0; /* XXX: warning */                          symetric_total += dbytes;
             total1 += dbytes;  
             if (s->type == XVID_TYPE_BVOP)  
                 dbytes *= rc->avg_length[XVID_TYPE_PVOP-1] / rc->avg_length[XVID_TYPE_BVOP-1];  
1384    
1385                          if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                          /* Apply assymetric curve compression */
1386                                  dbytes2=((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_high / 100.0);                          if (dbytes > rc->avg_length[s->type-1])
1387                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * (double)rc->param.curve_compression_high / 100.0f;
1388                            else
1389                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * (double)rc->param.curve_compression_low  / 100.0f;
1390    
1391                            /* Cap to the minimum frame size if needed */
1392                            if (dbytes + assymetric_delta < rc->min_length[s->type-1])
1393                                    assymetric_delta = rc->min_length[s->type-1] - dbytes;
1394    
1395                            /* Accumulate after assymetric curve compression */
1396                            assymetric_delta_total += assymetric_delta;
1397                    }
1398    
1399                    /* Compute the tax that all p/b frames have to pay in order to respect the
1400                     * bit distribution changes that the assymetric compression curve imposes
1401                     * We want assymetric_total = sum(0, n-1, tax.scaled_length)
1402                     *      ie assymetric_total = ratio.sum(0, n-1, scaled_length)
1403                     *         ratio = assymetric_total / symmetric_total */
1404                    rc->assymetric_tax_ratio = ((double)symetric_total - (double)assymetric_delta_total) / (double)symetric_total;
1405                          } else {                          } else {
1406                                  dbytes2 = ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_low / 100.0);                  rc->assymetric_tax_ratio = 1.0f;
1407                          }                          }
1408    
1409              if (s->type == XVID_TYPE_BVOP) {          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Assymetric tax ratio:%.2f\n", rc->assymetric_tax_ratio);
1410                              dbytes2 *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
1411                              if (dbytes2 < rc->min_length[XVID_TYPE_BVOP-1])          /* Last bits that need to be reset */
1412                                      dbytes2 = rc->min_length[XVID_TYPE_BVOP-1];          rc->overflow = 0;
1413              }else{          rc->KFoverflow = 0;
1414                              if (dbytes2 < rc->min_length[XVID_TYPE_PVOP-1])          rc->KFoverflow_partial = 0;
1415                                      dbytes2 = rc->min_length[XVID_TYPE_PVOP-1];          rc->KF_idx = 0;
1416            rc->desired_total = 0;
1417            rc->real_total = 0;
1418    
1419            /* Job done */
1420            return;
1421    }
1422    
1423    
1424    #ifdef VBV
1425    
1426    /*****************************************************************************
1427     * VBV compliancy check and scale
1428     * MPEG-4 standard specifies certain restrictions for bitrate/framesize in VBR
1429     * to enable playback on devices with limited readspeed and memory (and which
1430     * aren't...)
1431     *
1432     * DivX profiles have 2 criteria: VBV as in MPEG standard
1433     *                                a limit on peak bitrate for any 3 seconds
1434     *
1435     * But if VBV is fulfilled, peakrate is automatically fulfilled in any profile
1436     * define so far, so we check for it (for completeness) but correct only VBV
1437     *
1438     *****************************************************************************/
1439    
1440    #define VBV_COMPLIANT 0
1441    #define VBV_UNDERFLOW 1 /* video buffer runs empty */
1442    #define VBV_OVERFLOW 2  /* doesn't exist for VBR encoding */
1443    #define VBV_PEAKRATE 4  /* peak bitrate (within 3s) violated */
1444    
1445    static int check_curve_for_vbv_compliancy(rc_2pass2_t * rc, const float fps)
1446    {
1447    /* We do all calculations in float, for higher accuracy, and bytes for convenience
1448    
1449       typical values from DivX Home Theater profile:
1450       vbvsize= 384*1024 (384kB), vbvinitial= 288*1024 (75% fill)
1451       maxrate= 4000000 (4MBps), peakrate= 10000000 (10MBps)
1452    
1453       PAL: offset3s = 75 (3 seconds of 25fps)
1454       NTSC: offset3s = 90 (3 seconds of 29.97fps) or 72 (3 seconds of 23.976fps)
1455    */
1456    
1457      const float vbvsize = (float)rc->param.vbvsize/8.f;
1458      float vbvfill = (float)rc->param.vbvinitial/8.f;
1459    
1460      const float maxrate = (float)rc->param.vbv_maxrate;
1461      const float peakrate = (float)rc->param.vbv_peakrate;
1462      const float r0 = (int)(maxrate/fps+0.5)/8.f;
1463    
1464      int bytes3s = 0;
1465      int offset3s = (int)(3.f*fps+0.5);
1466    
1467      int i;
1468      for (i=0; i<rc->num_frames; i++) {
1469    /* DivX 3s peak bitrate check  */
1470    
1471        bytes3s += rc->stats[i].scaled_length;
1472        if (i>=offset3s)
1473          bytes3s -= rc->stats[i-offset3s].scaled_length;
1474    
1475        if (8.f*bytes3s > 3*peakrate)
1476          return VBV_PEAKRATE;
1477    
1478    /* update vbv fill level */
1479    
1480        vbvfill += r0 - rc->stats[i].scaled_length;
1481    
1482    /* this check is _NOT_ an "overflow"! only reading from disk stops then */
1483        if (vbvfill > vbvsize)
1484          vbvfill = vbvsize;
1485    
1486    /* but THIS would be an underflow. report it! */
1487        if (vbvfill < 0)
1488          return VBV_UNDERFLOW;
1489              }              }
1490              total2 += dbytes2;  
1491      return VBV_COMPLIANT;
1492    }
1493    /* idea: min(vbvfill) could be stored to print "minimum buffer fill" */
1494    
1495    
1496    
1497    static int scale_curve_for_vbv_compliancy(rc_2pass2_t * rc, const float fps)
1498    {
1499    /* correct any VBV violations. Peak bitrate violations disappears
1500       by this automatically
1501    
1502       This implementation follows
1503    
1504       Westerink, Rajagopalan, Gonzales "Two-pass MPEG-2 variable-bitrate encoding"
1505       IBM J. RES. DEVELOP. VOL 43, No. 4, July 1999, p.471--488
1506    
1507       Thanks, guys! This paper rocks!!!
1508    */
1509    
1510    /*
1511        For each scene of len N, we have to check up to N^2 possible buffer fills.
1512        This works well with MPEG-2 where N==12 or so, but for MPEG-4 it's a
1513        little slow...
1514    */
1515      const float vbvsize = (float)rc->param.vbvsize/8.f;
1516      const float vbvinitial = (float)rc->param.vbvinitial/8.f;
1517    
1518      const float maxrate = 0.9*rc->param.vbv_maxrate;
1519      const float vbvlow = 0.10f*vbvsize;
1520      const float r0 = (int)(maxrate/fps+0.5)/8.f;
1521    
1522      int i,k,l,n,violation = 0;
1523      float *scenefactor;
1524      int *scenestart;
1525      int *scenelength;
1526    
1527    /* first step: determine how many "scenes" there are and store their boundaries
1528       we could get all this from existing keyframe_positions, somehow, but there we
1529       don't have a min_scenelength, and it's no big deal to get it again.  */
1530    
1531      const int min_scenelength = 50;
1532      int num_scenes = 0;
1533      int last_scene = -999;
1534      for (i=0; i<rc->num_frames; i++) {
1535        if ( (rc->stats[i].type == XVID_TYPE_IVOP) && (i-last_scene>min_scenelength) )
1536        {
1537          last_scene = i;
1538          num_scenes++;
1539          }          }
1540      }      }
1541    
1542      rc->curve_comp_scale = total1 / total2;    scenefactor = (float*)malloc( num_scenes*sizeof(float) );
1543      scenestart = (int*)malloc( num_scenes*sizeof(int) );
1544      scenelength = (int*)malloc( num_scenes*sizeof(int) );
1545    
1546          DPRINTF(XVID_DEBUG_RC, "middle frame size for asymmetric curve compression: %i\n",    if ((!scenefactor) || (!scenestart) || (!scenelength) )
1547              (int)(rc->avg_length[XVID_TYPE_PVOP-1] * rc->curve_comp_scale));    {
1548        free(scenefactor);
1549        free(scenestart);
1550        free(scenelength);
1551        /* remember: free(0) is valid and does exactly nothing. */
1552        return -1;
1553      }
1554    
1555      rc->overflow = 0;  /* count again and safe the length/position */
1556      rc->KFoverflow = 0;  
1557      rc->KFoverflow_partial = 0;    num_scenes = 0;
1558      rc->KF_idx = 1;    last_scene = -999;
1559      for (i=0; i<rc->num_frames; i++) {
1560        if ( (rc->stats[i].type == XVID_TYPE_IVOP) && (i-last_scene>min_scenelength) )
1561        {
1562          if (num_scenes>0)
1563            scenelength[num_scenes-1]=i-last_scene;
1564          scenestart[num_scenes]=i;
1565          num_scenes++;
1566          last_scene = i;
1567  }  }
1568      }
1569      scenelength[num_scenes-1]=i-last_scene;
1570    
1571    /* second step: check for each scene, how much we can scale its frames up or down
1572       such that the VBV restriction is just fulfilled
1573    */
1574    
1575    
1576    #define R(k,n) (((n)+1-(k))*r0)     /* how much enters the buffer between frame k and n */
1577      for (l=0; l<num_scenes;l++)
1578      {
1579        const int start = scenestart[l];
1580        const int length = scenelength[l];
1581        twopass_stat_t * frames = &rc->stats[start];
1582    
1583        float S0n,Skn;
1584        float f,minf = 99999.f;
1585    
1586        S0n=0.;
1587        for (n=0;n<=length-1;n++)
1588        {
1589          S0n += frames[n].scaled_length;
1590    
1591          k=0;
1592          Skn = S0n;
1593          f = (R(k,n-1) + (vbvinitial - vbvlow)) / Skn;
1594          if (f < minf)
1595            minf = f;
1596    
1597          for (k=1;k<=n;k++)
1598          {
1599            Skn -= frames[k].scaled_length;
1600    
1601            f = (R(k,n-1) + (vbvsize - vbvlow)) / Skn;
1602            if (f < minf)
1603              minf = f;
1604          }
1605        }
1606    
1607        /* special case: at the end, fill buffer up to vbvinitial again
1608           TODO: Allow other values for buffer fill between scenes
1609           e.g. if n=N is smallest f-value, then check for better value */
1610    
1611        n=length;
1612        k=0;
1613        Skn = S0n;
1614        f = R(k,n-1)/Skn;
1615        if (f < minf)
1616          minf = f;
1617    
1618        for (k=1;k<=n-1;k++)
1619        {
1620          Skn -= frames[k].scaled_length;
1621    
1622          f = (R(k,n-1) + (vbvinitial - vbvlow)) / Skn;
1623          if (f < minf)
1624            minf = f;
1625        }
1626    
1627    #ifdef VBV_DEBUG
1628        printf("Scene %d (Frames %d-%d): VBVfactor %f\n", l, start, start+length-1 , minf);
1629    #endif
1630    
1631        scenefactor[l] = minf;
1632      }
1633    #undef R
1634    
1635    /* last step: now we know of any scene how much it can be scaled up or down without
1636       violating VBV. Next, distribute bits from the evil scenes to the good ones */
1637    
1638      do
1639      {
1640        float S_red = 0.f;    /* how much to redistribute */
1641        float S_elig = 0.f;   /* sum of bit for those scenes you can still swallow something*/
1642        int l;
1643    
1644        for (l=0;l<num_scenes;l++)   /* check how much is wrong */
1645        {
1646        const int start = scenestart[l];
1647        const int length = scenelength[l];
1648        twopass_stat_t * frames = &rc->stats[start];
1649    
1650          if (scenefactor[l] == 1.) /* exactly 1 means "don't touch this anymore!" */
1651            continue;
1652    
1653          if (scenefactor[l] > 1.) /* within limits */
1654          {
1655            for (n= 0; n < length; n++)
1656              S_elig += frames[n].scaled_length;
1657          }
1658          else /* underflowing segment */
1659          {
1660            for (n= 0; n < length; n++)
1661            {
1662              float newbytes = (float)frames[n].scaled_length * scenefactor[l];
1663              S_red += (float)frames[n].scaled_length - (float)newbytes;
1664              frames[n].scaled_length =(int)newbytes;
1665            }
1666            scenefactor[l] = 1.f;
1667          }
1668        }
1669    
1670        if (S_red < 1.f)   /* no more underflows */
1671          break;
1672    
1673        if (S_elig < 1.f)
1674        {
1675    #ifdef VBV_DEBUG
1676          fprintf(stderr,"Everything underflowing. \n");
1677    #endif
1678          free(scenefactor);
1679          free(scenestart);
1680          free(scenelength);
1681          return -2;
1682        }
1683    
1684        const float f_red = (1.f + S_red/S_elig);
1685    
1686    #ifdef VBV_DEBUG
1687        printf("Moving %.0f kB to avoid buffer underflow, correction factor: %.5f\n",S_red/1024.f,f_red);
1688    #endif
1689    
1690        violation=0;
1691        for (l=0; l<num_scenes; l++)   /* scale remaining scenes up to meet total size */
1692        {
1693          const int start = scenestart[l];
1694          const int length = scenelength[l];
1695          twopass_stat_t * frames = &rc->stats[start];
1696    
1697          if (scenefactor[l] == 1.)
1698            continue;
1699    
1700          /* there shouldn't be any segments with factor<1 left, so all the rest is >1 */
1701    
1702          for (n= 0; n < length; n++)
1703          {
1704            frames[n].scaled_length = (int)(frames[n].scaled_length * f_red + 0.5);
1705          }
1706    
1707          scenefactor[l] /= f_red;
1708          if (scenefactor[l] < 1.f)
1709            violation=1;
1710        }
1711    
1712      } while (violation);
1713    
1714      free(scenefactor);
1715      free(scenestart);
1716      free(scenelength);
1717      return 0;
1718    }
1719    
1720    
1721    #endif
1722    
1723    
1724    /*****************************************************************************
1725     * Still more low level stuff (nothing to do with stats treatment)
1726     ****************************************************************************/
1727    
1728    /* This function returns an allocated string containing a complete line read
1729     * from the file starting at the current position */
1730    static char *
1731    readline(FILE *f)
1732    {
1733            char *buffer = NULL;
1734            int buffer_size = 0;
1735            int pos = 0;
1736    
1737            do {
1738                    int c;
1739    
1740                    /* Read a character from the stream */
1741                    c = fgetc(f);
1742    
1743                    /* Is that EOF or new line ? */
1744                    if(c == EOF || c == '\n')
1745                            break;
1746    
1747                    /* Do we have to update buffer ? */
1748                    if(pos >= buffer_size - 1) {
1749                            buffer_size += BUF_SZ;
1750                            buffer = (char*)realloc(buffer, buffer_size);
1751                            if (buffer == NULL)
1752                                    return(NULL);
1753                    }
1754    
1755                    buffer[pos] = c;
1756                    pos++;
1757            } while(1);
1758    
1759            /* Read \n or EOF */
1760            if (buffer == NULL) {
1761                    /* EOF, so we reached the end of the file, return NULL */
1762                    if(feof(f))
1763                            return(NULL);
1764    
1765                    /* Just an empty line with just a newline, allocate a 1 byte buffer to
1766                     * store a zero length string */
1767                    buffer = (char*)malloc(1);
1768                    if(buffer == NULL)
1769                            return(NULL);
1770            }
1771    
1772            /* Zero terminated string */
1773            buffer[pos] = '\0';
1774    
1775            return(buffer);
1776    }
1777    
1778    /* This function returns a pointer to the first non space char in the given
1779     * string */
1780    static char *
1781    skipspaces(char *string)
1782    {
1783            const char spaces[] =
1784                    {
1785                            ' ','\t','\0'
1786                    };
1787            const char *spacechar = spaces;
1788    
1789            if (string == NULL) return(NULL);
1790    
1791            while (*string != '\0') {
1792                    /* Test against space chars */
1793                    while (*spacechar != '\0') {
1794                            if (*string == *spacechar) {
1795                                    string++;
1796                                    spacechar = spaces;
1797                                    break;
1798                            }
1799                            spacechar++;
1800                    }
1801    
1802                    /* No space char */
1803                    if (*spacechar == '\0') return(string);
1804            }
1805    
1806            return(string);
1807    }
1808    
1809    /* This function returns a boolean that tells if the string is only a
1810     * comment */
1811    static int
1812    iscomment(char *string)
1813    {
1814            const char comments[] =
1815                    {
1816                            '#',';', '%', '\0'
1817                    };
1818            const char *cmtchar = comments;
1819            int iscomment = 0;
1820    
1821            if (string == NULL) return(1);
1822    
1823            string = skipspaces(string);
1824    
1825            while(*cmtchar != '\0') {
1826                    if(*string == *cmtchar) {
1827                            iscomment = 1;
1828                            break;
1829                    }
1830                    cmtchar++;
1831            }
1832    
1833            return(iscomment);
1834    }
1835    
1836    #if 0
1837    static void
1838    stats_print(rc_2pass2_t * rc)
1839    {
1840            int i;
1841            const char frame_type[4] = { 'i', 'p', 'b', 's'};
1842    
1843            for (i=0; i<rc->num_frames; i++) {
1844                    twopass_stat_t *s = &rc->stats[i];
1845                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- frame:%d type:%c quant:%d stats:%d scaled:%d desired:%d actual:%d overflow(%c):%.2f\n",
1846                                    i, frame_type[s->type-1], -1, s->length, s->scaled_length,
1847                                    s->desired_length, -1, frame_type[s->type-1], -1.0f);
1848            }
1849    }
1850    #endif
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