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revision 1048, Thu May 29 11:37:20 2003 UTC revision 1347, Sat Jan 31 14:51:56 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 1.1.2.37 2004-01-31 14:51:56 syskin 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             * Histerysis 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    #if 0
274    static void stats_print(rc_2pass2_t * rc);
275    #endif
276    
277  /*----------------------------------------------------------------------------  /*----------------------------------------------------------------------------
278   *--------------------------------------------------------------------------*/   *--------------------------------------------------------------------------*/
# Line 178  Line 290 
290    
291      rc->param = *param;      rc->param = *param;
292    
293          /*          /* Initialize all defaults */
          * Initialize all defaults  
          */  
294  #define _INIT(a, b) if((a) <= 0) (a) = (b)  #define _INIT(a, b) if((a) <= 0) (a) = (b)
295      /* Let's set our defaults if needed */      /* Let's set our defaults if needed */
296          _INIT(rc->param.keyframe_boost, DEFAULT_KEYFRAME_BOOST);          _INIT(rc->param.keyframe_boost, DEFAULT_KEYFRAME_BOOST);
297          _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);  
298      _INIT(rc->param.curve_compression_high, DEFAULT_CURVE_COMPRESSION_HIGH);      _INIT(rc->param.curve_compression_high, DEFAULT_CURVE_COMPRESSION_HIGH);
299      _INIT(rc->param.curve_compression_low, DEFAULT_CURVE_COMPRESSION_LOW);      _INIT(rc->param.curve_compression_low, DEFAULT_CURVE_COMPRESSION_LOW);
300      _INIT(rc->param.max_overflow_improvement, DEFAULT_MAX_OVERFLOW_IMPROVEMENT);      _INIT(rc->param.max_overflow_improvement, DEFAULT_MAX_OVERFLOW_IMPROVEMENT);
301      _INIT(rc->param.max_overflow_degradation,  DEFAULT_MAX_OVERFLOW_DEGRADATION);      _INIT(rc->param.max_overflow_degradation,  DEFAULT_MAX_OVERFLOW_DEGRADATION);
302    
303      /* Keyframe settings */      /* Keyframe settings */
         _INIT(rc->param.kftreshold, DEFAULT_KFTRESHOLD);  
304      _INIT(rc->param.kfreduction, DEFAULT_KFREDUCTION);      _INIT(rc->param.kfreduction, DEFAULT_KFREDUCTION);
305      _INIT(rc->param.min_key_interval, DEFAULT_MIN_KEY_INTERVAL);          _INIT(rc->param.kfthreshold, DEFAULT_KFTHRESHOLD);
306  #undef _INIT  #undef _INIT
307    
308          /* Initialize some stuff to zero */          /* Initialize some stuff to zero */
         for(i=0; i<32; i++) rc->quant_count[i] = 0;  
   
309          for(i=0; i<3; i++) {          for(i=0; i<3; i++) {
310                  int j;                  int j;
311                  for (j=0; j<32; j++)                  for (j=0; j<32; j++) {
312                          rc->quant_error[i][j] = 0;                          rc->quant_error[i][j] = 0;
313                            rc->quant_count[i][j] = 0;
314                    }
315          }          }
316    
317          for (i=0; i<3; i++)          for (i=0; i<3; i++) rc->last_quant[i] = 0;
                 rc->last_quant[i] = 0;  
318    
319          rc->fq_error = 0;          rc->fq_error = 0;
320            rc->min_quant = 1;
321    
322          /* Count frames in the stats file */          /* Count frames (and intra frames) in the stats file, store the result into
323          if (!det_stats_length(rc, param->filename)) {           * the rc structure */
324                  DPRINTF(XVID_DEBUG_RC,"ERROR: fopen %s failed\n", param->filename);          if (statsfile_count_frames(rc, param->filename) == -1) {
325                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- ERROR: fopen %s failed\n", param->filename);
326                  free(rc);                  free(rc);
327                  return XVID_ERR_FAIL;                  return(XVID_ERR_FAIL);
328          }          }
329    
330      /* Allocate the stats' memory */      /* Allocate the stats' memory */
331          if ((rc->stats = malloc(rc->num_frames * sizeof(stat_t))) == NULL) {          if ((rc->stats = malloc(rc->num_frames * sizeof(twopass_stat_t))) == NULL) {
332          free(rc);          free(rc);
333          return XVID_ERR_MEMORY;                  return(XVID_ERR_MEMORY);
334      }      }
335    
336      /*          /* Allocate keyframes location's memory
337           * 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  
          */  
338          rc->keyframe_locations = malloc((rc->num_keyframes + 1) * sizeof(int));          rc->keyframe_locations = malloc((rc->num_keyframes + 1) * sizeof(int));
339          if (rc->keyframe_locations == NULL) {          if (rc->keyframe_locations == NULL) {
340                  free(rc->stats);                  free(rc->stats);
341                  free(rc);                  free(rc);
342                  return XVID_ERR_MEMORY;                  return(XVID_ERR_MEMORY);
343          }          }
344    
345          if (!load_stats(rc, param->filename)) {          /* Load the first pass stats */
346                  DPRINTF(XVID_DEBUG_RC,"ERROR: fopen %s failed\n", param->filename);          if (statsfile_load(rc, param->filename) == -1) {
347                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- ERROR: fopen %s failed\n", param->filename);
348                  free(rc->keyframe_locations);                  free(rc->keyframe_locations);
349                  free(rc->stats);                  free(rc->stats);
350                  free(rc);                  free(rc);
# Line 244  Line 352 
352          }          }
353    
354          /* Compute the target filesize */          /* Compute the target filesize */
355          if (rc->num_frames  < create->fbase/create->fincr) {          if (rc->param.bitrate<0) {
356                    /* if negative, bitrate equals the target (in kbytes) */
357                    rc->target = ((uint64_t)(-rc->param.bitrate)) * 1024;
358            } else if (rc->num_frames  < create->fbase/create->fincr) {
359                  /* 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 */
360                  rc->target = rc->param.bitrate / 8;                  rc->target = rc->param.bitrate / 8;
361          } else {          } else {
# Line 255  Line 366 
366                          ((uint64_t)create->fbase * 8);                          ((uint64_t)create->fbase * 8);
367          }          }
368    
369          DPRINTF(XVID_DEBUG_RC, "Frame rate: %d/%d (%ffps)\n",          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Frame rate: %d/%d (%ffps)\n",
370                          create->fbase, create->fincr,                          create->fbase, create->fincr,
371                          (double)create->fbase/(double)create->fincr);                          (double)create->fbase/(double)create->fincr);
372          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);
373          DPRINTF(XVID_DEBUG_RC, "Target bitrate: %ld\n", rc->param.bitrate);          if(rc->param.bitrate>=0)
374          DPRINTF(XVID_DEBUG_RC, "Target filesize: %lld\n", rc->target);                  DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Target bitrate: %ld\n", rc->param.bitrate);
375            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Target filesize: %lld\n", rc->target);
376    
377          /* Compensate the average frame overhead caused by the container */          /* Compensate the average frame overhead caused by the container */
378          rc->target -= rc->num_frames*rc->param.container_frame_overhead;          rc->target -= rc->num_frames*rc->param.container_frame_overhead;
379          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);
380          DPRINTF(XVID_DEBUG_RC, "Target filesize (after container compensation): %lld\n", rc->target);          if(rc->param.container_frame_overhead)
381                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- New target filesize after container compensation: %lld\n", rc->target);
382    
383          /*          /* When bitrate is not given it means it has been scaled by an external
384           * First data pre processing:           * application */
385            if (rc->param.bitrate) {
386                    /* Apply zone settings
387                     * - set rc->tot_quant which represents the total num of bytes spent in
388                     *   fixed quant zones
389                     * - set rc->tot_weighted which represents the total amount of bytes
390                     *   spent in normal or weighted zones in first pass (normal zones can
391                     *   be considered weight=1)
392                     * - set rc->tot_quant_invariant which represents the total num of bytes
393                     *   spent in fixed quant zones for headers */
394                    zone_process(rc, create);
395            } else {
396                    /* External scaling -- zones are ignored */
397                    for (i=0;i<rc->num_frames;i++) {
398                            rc->stats[i].zone_mode = XVID_ZONE_WEIGHT;
399                            rc->stats[i].weight = 1.0;
400                    }
401                    rc->tot_quant = 0;
402            }
403    
404            /* Gathers some information about first pass stats:
405           *  - finds the minimum frame length for each frame type during 1st pass.           *  - finds the minimum frame length for each frame type during 1st pass.
406           *     rc->min_size[]           *     rc->min_size[]
407           *  - determines the maximum frame length observed (no frame type distinction).           *  - determines the maximum frame length observed (no frame type distinction).
# Line 276  Line 409 
409           *  - count how many times each frame type has been used.           *  - count how many times each frame type has been used.
410           *     rc->count[]           *     rc->count[]
411           *  - total bytes used per frame type           *  - total bytes used per frame type
412           *     rc->total[]           *     rc->tot_length[]
413             *  - total bytes considered invariant between the 2 passes
414           *  - store keyframe location           *  - store keyframe location
415           *     rc->keyframe_locations[]           *     rc->keyframe_locations[]
416           */           */
417          pre_process0(rc);          first_pass_stats_prepare_data(rc);
418    
419          /*          /* 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  
          */  
420          if (rc->param.bitrate) {          if (rc->param.bitrate) {
421                  /* Apply zone settings */                  /* Perform internal curve scaling */
422                  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;  
                 }  
                 rc->avg_weight = 1.0;  
                 rc->tot_quant = 0;  
423          }          }
424    
425          pre_process1(rc);          /* Apply advanced curve options, and compute some parameters in order to
426             * shape the curve in the BEFORE/AFTER pair of functions */
427            scaled_curve_apply_advanced_parameters(rc);
428    
429          *handle = rc;          *handle = rc;
430          return(0);          return(0);
# Line 313  Line 436 
436  static int  static int
437  rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy)  rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy)
438  {  {
439            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- target_total:%lld desired_total:%.2f (%.2f%%) actual_total:%.2f (%.2f%%)\n",
440                            rc->target,
441                            rc->desired_total,
442                            100*rc->desired_total/(double)rc->target,
443                            rc->real_total,
444                            100*rc->real_total/(double)rc->target);
445    
446      free(rc->keyframe_locations);      free(rc->keyframe_locations);
447      free(rc->stats);      free(rc->stats);
448          free(rc);          free(rc);
# Line 325  Line 455 
455  static int  static int
456  rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)  rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)
457  {  {
458          stat_t * s = &rc->stats[data->frame_num];          twopass_stat_t * s = &rc->stats[data->frame_num];
         int overflow;  
         int desired;  
459          double dbytes;          double dbytes;
         double curve_temp;  
460          double scaled_quant;          double scaled_quant;
461            double overflow;
462          int capped_to_max_framesize = 0;          int capped_to_max_framesize = 0;
463    
464          /*          /* This function is quite long but easy to understand. In order to simplify
465           * 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.  
          */  
466    
467          /* First case: Another plugin has already set a quantizer */          /* First case: Another plugin has already set a quantizer */
468      if (data->quant > 0)      if (data->quant > 0)
469                  return(0);                  return(0);
470    
471          /* Second case: We are in a Quant zone */          /* Second case: insufficent stats data
472             * We can't guess much what we should do, let core decide all alone */
473            if (data->frame_num >= rc->num_frames) {
474                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- stats file too short (now processing frame %d)",
475                            data->frame_num);
476                    return(0);
477            }
478    
479            /* Third case: We are in a Quant zone
480             * Quant zones must just ensure we use the same settings as first pass
481             * So set the quantizer and the type */
482          if (s->zone_mode == XVID_ZONE_QUANT) {          if (s->zone_mode == XVID_ZONE_QUANT) {
483                    /* Quant stuff */
484                  rc->fq_error += s->weight;                  rc->fq_error += s->weight;
485                  data->quant = (int)rc->fq_error;                  data->quant = (int)rc->fq_error;
486                  rc->fq_error -= data->quant;                  rc->fq_error -= data->quant;
487    
488                    /* The type stuff */
489                    data->type = s->type;
490    
491                    /* The only required data for AFTER step is this one for the overflow
492                     * control */
493                  s->desired_length = s->length;                  s->desired_length = s->length;
494    
495                  return(0);                  return(0);
496          }          }
497    
         /* 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;  
498    
499          /*          /*************************************************************************/
500           * The rc->overflow field represents the overflow in current scene (between two          /*************************************************************************/
501           * IFrames) so we must not forget to reset it if we are entering a new scene          /*************************************************************************/
          */  
         if (s->type == XVID_TYPE_IVOP)  
                 overflow = 0;  
502    
503          desired = s->scaled_length;          /*-------------------------------------------------------------------------
504             * Frame bit allocation first part
505             *
506             * First steps apply user settings, just like it is done in the theoritical
507             * scaled_curve_apply_advanced_parameters
508             *-----------------------------------------------------------------------*/
509    
510          dbytes = desired;          /* Set desired to what we are wanting to obtain for this frame */
511          if (s->type == XVID_TYPE_IVOP)          dbytes = (double)s->scaled_length;
                 dbytes += desired * rc->param.keyframe_boost / 100;  
         dbytes /= rc->movie_curve;  
512    
513          /*          /* IFrame user settings*/
514           * We are now entering in the hard part of the algo, it was first designed          if (s->type == XVID_TYPE_IVOP) {
515           * to work with i/pframes only streams, so the way it computes things is                  /* Keyframe boosting -- All keyframes benefit from it */
516           * 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];  
517    
518          /*  #if 0 /* ToDo: decide how to apply kfthresholding */
519           * 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);  
520          } else {          } else {
                 desired = (int)(rc->curve_comp_error * dbytes /  
                                                 rc->avg_length[XVID_TYPE_PVOP-1] / rc->param.bitrate_payback_delay);  
521    
522                  if (labs(desired) > fabs(rc->curve_comp_error)) {                  /* P/S/B frames must reserve some bits for iframe boosting */
523                          desired = (int)rc->curve_comp_error;                  dbytes *= rc->pb_iboost_tax_ratio;
524    
525                    /* Apply assymetric curve compression */
526                    if (rc->param.curve_compression_high || rc->param.curve_compression_low) {
527                            double assymetric_delta;
528    
529                            /* Compute the assymetric delta, this is computed before applying
530                             * the tax, as done in the pre_process function */
531                            if (dbytes > rc->avg_length[s->type-1])
532                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_high / 100.0;
533                            else
534                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_low  / 100.0;
535    
536                            /* Now we must apply the assymetric tax, else our curve compression
537                             * would not give a theoritical target size equal to what it is
538                             * expected */
539                            dbytes *= rc->assymetric_tax_ratio;
540    
541                            /* Now we can add the assymetric delta */
542                            dbytes += assymetric_delta;
543                  }                  }
544          }          }
545    
546          rc->curve_comp_error -= desired;          /* That is what we would like to have -- Don't put that chunk after
547             * overflow control, otherwise, overflow is counted twice and you obtain
548             * half sized bitrate sequences */
549            s->desired_length  = (int)dbytes;
550            rc->desired_total += dbytes;
551    
552          /* XXX: warning */          /*------------------------------------------------------------------------
553          curve_temp = 0;           * Frame bit allocation: overflow control part.
554             *
555             * Unlike the theoritical scaled_curve_apply_advanced_parameters, here
556             * it's real encoding and we need to make sure we don't go so far from
557             * what is our ideal scaled curve.
558             *-----------------------------------------------------------------------*/
559    
560            /* Compute the overflow we should compensate */
561            if (s->type != XVID_TYPE_IVOP || rc->overflow > 0) {
562                    double frametype_factor;
563                    double framesize_factor;
564    
565          if ((rc->param.curve_compression_high + rc->param.curve_compression_low) &&     s->type != XVID_TYPE_IVOP) {                  /* Take only the desired part of overflow */
566                    overflow = rc->overflow;
567    
568                  curve_temp = rc->curve_comp_scale;                  /* Factor that will take care to decrease the overflow applied
569                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                   * according to the importance of this frame type in term of
570                          curve_temp *= ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_high / 100.0);                   * overall size */
571                  } else {                  frametype_factor  = rc->count[XVID_TYPE_IVOP-1]*rc->avg_length[XVID_TYPE_IVOP-1];
572                          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];
573                  }                  frametype_factor += rc->count[XVID_TYPE_BVOP-1]*rc->avg_length[XVID_TYPE_BVOP-1];
574                    frametype_factor /= rc->count[s->type-1]*rc->avg_length[s->type-1];
575                    frametype_factor  = 1/frametype_factor;
576    
577                    /* Factor that will take care not to compensate too much for this frame
578                     * size */
579                    framesize_factor  = dbytes;
580                    framesize_factor /= rc->avg_length[s->type-1];
581    
582                  /*                  /* Treat only the overflow part concerned by this frame type and size */
583                   * End of code path for curve_temp, as told earlier, we are now                  overflow *= frametype_factor;
584                   * obliged to scale the value to a bframe one using the inverse  #if 0
585                   * ratio applied earlier                  /* Leave this one alone, as it impacts badly on quality */
586                   */                  overflow *= framesize_factor;
587                  if (s->type == XVID_TYPE_BVOP)  #endif
                         curve_temp *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
588    
589                  desired += (int)curve_temp;                  /* Apply the overflow strength imposed by the user */
590                  rc->curve_comp_error += curve_temp - (int)curve_temp;                  overflow *= (rc->param.overflow_control_strength/100.0f);
591          } else {          } else {
592                  /*                  /* no negative overflow applied in IFrames because:
593                   * End of code path for dbytes, as told earlier, we are now                   *  - their role is important as they're references for P/BFrames.
594                   * 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
595                   * ratio applied earlier                   *    much, this overflow may impact the next IFrame too much and generate
596                   */                   *    a sequence of poor quality frames */
597                  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;  
598          }          }
599    
600            /* Make sure we are not trying to compensate more overflow than we even have */
601            if (fabs(overflow) > fabs(rc->overflow))
602                    overflow = rc->overflow;
603    
604          /*          /* Make sure the overflow doesn't make the frame size to get out of the range
605           * We can't do bigger frames than first pass, this would be stupid as first           * [-max_degradation..+max_improvment] */
606           * 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) {
607           * many bytes and we would not not gain much quality.                  if(overflow <= dbytes)
608           */                          dbytes += dbytes * rc->param.max_overflow_improvement / 100;
609          if (desired > s->length) {                  else
610                  rc->curve_comp_error += desired - s->length;                          dbytes += overflow * rc->param.max_overflow_improvement / 100;
611                  desired = s->length;          } else if (overflow < - dbytes * rc->param.max_overflow_degradation / 100) {
612                    dbytes -= dbytes * rc->param.max_overflow_degradation / 100;
613          } else {          } else {
614                  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];  
                 }  
615          }          }
616    
617          s->desired_length = desired;          /*-------------------------------------------------------------------------
618             * Frame bit allocation last part:
619             *
620          /*           * Cap frame length so we don't reach neither bigger frame sizes than first
621           * if this keyframe is too close to the next, reduce it's byte allotment           * pass nor smaller than the allowed minimum.
622           * XXX: why do we do this after setting the desired length ?           *-----------------------------------------------------------------------*/
623           */  
624    #ifdef PASS_SMALLER
625          if (s->type == XVID_TYPE_IVOP) {          if (dbytes > s->length) {
626                  int KFdistance = rc->keyframe_locations[rc->KF_idx] - rc->keyframe_locations[rc->KF_idx - 1];                  dbytes = s->length;
627            }
628                  if (KFdistance < rc->param.kftreshold) {  #endif
629    
630                          KFdistance -= rc->param.min_key_interval;          /* Prevent stupid desired sizes under logical values */
631            if (dbytes < rc->min_length[s->type-1]) {
632                    dbytes = rc->min_length[s->type-1];
633            }
634    
635                          if (KFdistance >= 0) {          /*------------------------------------------------------------------------
636                                  int KF_min_size;           * Desired frame length <-> quantizer mapping
637             *-----------------------------------------------------------------------*/
638    
639                                  KF_min_size = desired * (100 - rc->param.kfreduction) / 100;  #ifdef BQUANT_PRESCALE
640                                  if (KF_min_size < 1)          /* For bframes we prescale the quantizer to avoid too high quant scaling */
641                                          KF_min_size = 1;          if(s->type == XVID_TYPE_BVOP) {
642    
643                                  desired = KF_min_size + (desired - KF_min_size) * KFdistance /                  twopass_stat_t *b_ref = s;
                                         (rc->param.kftreshold - rc->param.min_key_interval);  
644    
645                                  if (desired < 1)                  /* Find the reference frame */
646                                          desired = 1;                  while(b_ref != &rc->stats[0] && b_ref->type == XVID_TYPE_BVOP)
647                          }                          b_ref--;
648                  }  
649                    /* Compute the original quant */
650                    s->quant  = 2*(100*s->quant - data->bquant_offset);
651                    s->quant += data->bquant_ratio - 1; /* to avoid rounding issues */
652                    s->quant  = s->quant/data->bquant_ratio - b_ref->quant;
653          }          }
654    #endif
655    
656          overflow = (int)((double)overflow * desired / rc->avg_length[XVID_TYPE_PVOP-1]);          /* Don't laugh at this very 'simple' quant<->size relationship, it
657             * proves to be acurate enough for our algorithm */
658          /* Reign in overflow with huge frames */          scaled_quant = (double)s->quant*(double)s->length/(double)dbytes;
659          if (labs(overflow) > labs(rc->overflow))  
660                  overflow = rc->overflow;  #ifdef COMPENSATE_FORMULA
661            /* We know xvidcore will apply the bframe formula again, so we compensate
662          /* Make sure overflow doesn't run away */           * it right now to make sure we would not apply it twice */
663          if (overflow > desired * rc->param.max_overflow_improvement / 100) {          if(s->type == XVID_TYPE_BVOP) {
                 desired += (overflow <= desired) ? desired * rc->param.max_overflow_improvement / 100 :  
                         overflow * rc->param.max_overflow_improvement / 100;  
         } else if (overflow < desired * rc->param.max_overflow_degradation / -100){  
                 desired += desired * rc->param.max_overflow_degradation / -100;  
         } else {  
                 desired += overflow;  
         }  
664    
665          /* 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);  
         }  
666    
667          /* Make sure to not scale below the minimum framesize */                  /* Find the reference frame */
668          if (desired < rc->min_length[s->type-1]) {                  while(b_ref != &rc->stats[0] && b_ref->type == XVID_TYPE_BVOP)
669                  desired = rc->min_length[s->type-1];                          b_ref--;
670                  DPRINTF(XVID_DEBUG_RC,"[%i] Capped to minimum frame size\n",  
671                                  data->frame_num);                  /* Compute the quant it would be if the core did not apply the bframe
672                     * formula */
673                    scaled_quant  = 100*scaled_quant - data->bquant_offset;
674                    scaled_quant += data->bquant_ratio - 1; /* to avoid rouding issues */
675                    scaled_quant /= data->bquant_ratio;
676          }          }
677    #endif
678    
679          /*          /* Quantizer has been scaled using floating point operations/results, we
680           * 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  
          */  
681          data->quant = (int)scaled_quant;          data->quant = (int)scaled_quant;
682    
683          /* Let's clip the computed quantizer, if needed */          /* Let's clip the computed quantizer, if needed */
# Line 539  Line 685 
685                  data->quant = 1;                  data->quant = 1;
686          } else if (data->quant > 31) {          } else if (data->quant > 31) {
687                  data->quant = 31;                  data->quant = 31;
688          } else if (s->type != XVID_TYPE_IVOP) {          } else {
689    
690                  /*                  /* 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  
691                   * computed quantizer, do not loose quantizer decimal part that we                   * computed quantizer, do not loose quantizer decimal part that we
692                   * accumulate for later reuse when its sum represents a complete unit.                   * accumulate for later reuse when its sum represents a complete
693                   */                   * unit. */
694                  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;
695    
696                  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 700 
700                          rc->quant_error[s->type-1][data->quant] += 1.0;                          rc->quant_error[s->type-1][data->quant] += 1.0;
701                          data->quant--;                          data->quant--;
702                  }                  }
   
703          }          }
704    
705          /*          /* 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  
706           * possible +1 correction due to cumulated error. We can now safely clip           * possible +1 correction due to cumulated error. We can now safely clip
707           * the quantizer again with user's quant ranges. "Safely" means the Rate           * the quantizer again with user's quant ranges. "Safely" means the Rate
708           * Control could learn more about this quantizer, this knowledge is useful           * Control could learn more about this quantizer, this knowledge is useful
709           * 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,
710           * that's why we don't perform this clipping earlier.           * that's why we don't perform this clipping earlier. */
          */  
711          if (data->quant < data->min_quant[s->type-1]) {          if (data->quant < data->min_quant[s->type-1]) {
712                  data->quant = data->min_quant[s->type-1];                  data->quant = data->min_quant[s->type-1];
713          } else if (data->quant > data->max_quant[s->type-1]) {          } else if (data->quant > data->max_quant[s->type-1]) {
714                  data->quant = data->max_quant[s->type-1];                  data->quant = data->max_quant[s->type-1];
715          }          }
716    
717          /*          if (data->quant < rc->min_quant) data->quant = rc->min_quant;
718           * To avoid big quality jumps from frame to frame, we apply a "security"  
719            /* To avoid big quality jumps from frame to frame, we apply a "security"
720           * rule that makes |last_quant - new_quant| <= 2. This rule only applies           * rule that makes |last_quant - new_quant| <= 2. This rule only applies
721           * to predicted frames (P and B)           * to predicted frames (P and B) */
          */  
722          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) {
723    
724                  if (data->quant > rc->last_quant[s->type-1] + 2) {                  if (data->quant > rc->last_quant[s->type-1] + 2) {
725                          data->quant = rc->last_quant[s->type-1] + 2;                          data->quant = rc->last_quant[s->type-1] + 2;
726                          DPRINTF(XVID_DEBUG_RC,                          DPRINTF(XVID_DEBUG_RC,
727                                          "[%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",
728                                          data->frame_num);                                          data->frame_num);
729                  }                  }
730                  if (data->quant < rc->last_quant[s->type-1] - 2) {                  if (data->quant < rc->last_quant[s->type-1] - 2) {
731                          data->quant = rc->last_quant[s->type-1] - 2;                          data->quant = rc->last_quant[s->type-1] - 2;
732                          DPRINTF(XVID_DEBUG_RC,                          DPRINTF(XVID_DEBUG_RC,
733                                          "[%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",
734                                          data->frame_num);                                          data->frame_num);
735                  }                  }
736          }          }
737    
738          /*          /* We don't want to pollute the RC histerisis when our computed quant has
739           * 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  
          */  
740          if (capped_to_max_framesize == 0)          if (capped_to_max_framesize == 0)
741                  rc->last_quant[s->type-1] = data->quant;                  rc->last_quant[s->type-1] = data->quant;
742    
743            /* Don't forget to force 1st pass frame type ;-) */
744            data->type = s->type;
745    
746          return 0;          return 0;
747  }  }
748    
# Line 610  Line 753 
753  rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)  rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)
754  {  {
755          const char frame_type[4] = { 'i', 'p', 'b', 's'};          const char frame_type[4] = { 'i', 'p', 'b', 's'};
756          stat_t * s = &rc->stats[data->frame_num];          twopass_stat_t * s = &rc->stats[data->frame_num];
757    
758          /* Insufficent stats data */          /* Insufficent stats data */
759      if (data->frame_num >= rc->num_frames)      if (data->frame_num >= rc->num_frames)
760          return 0;          return 0;
761    
762      rc->quant_count[data->quant]++;          /* Update the quantizer counter */
763            rc->quant_count[s->type-1][data->quant]++;
764    
765            /* Update the frame type overflow */
766      if (data->type == XVID_TYPE_IVOP) {      if (data->type == XVID_TYPE_IVOP) {
767          int kfdiff = (rc->keyframe_locations[rc->KF_idx] -      rc->keyframe_locations[rc->KF_idx - 1]);                  int kfdiff = 0;
768    
769                    if(rc->KF_idx != rc->num_frames -1) {
770                            kfdiff  = rc->keyframe_locations[rc->KF_idx+1];
771                            kfdiff -= rc->keyframe_locations[rc->KF_idx];
772                    }
773    
774                    /* Flush Keyframe overflow accumulator */
775          rc->overflow += rc->KFoverflow;          rc->overflow += rc->KFoverflow;
776    
777                    /* Store the frame overflow to the keyframe accumulator */
778          rc->KFoverflow = s->desired_length - data->length;          rc->KFoverflow = s->desired_length - data->length;
779    
780          if (kfdiff > 1) {  // non-consecutive keyframes                  if (kfdiff > 1) {
781                            /* Non-consecutive keyframes case:
782                             * We can then divide this total keyframe overflow into equal parts
783                             * that we will distribute into regular overflow at each frame
784                             * between the sequence bounded by two IFrames */
785              rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);              rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);
786          }else{ // consecutive keyframes                  } else {
787                            /* Consecutive keyframes case:
788                             * Flush immediatly the keyframe overflow and reset keyframe
789                             * overflow */
790                          rc->overflow += rc->KFoverflow;                          rc->overflow += rc->KFoverflow;
791                          rc->KFoverflow = 0;                          rc->KFoverflow = 0;
792                          rc->KFoverflow_partial = 0;                          rc->KFoverflow_partial = 0;
793          }          }
794          rc->KF_idx++;          rc->KF_idx++;
795      } else {      } else {
796          // distribute part of the keyframe overflow                  /* Accumulate the frame overflow */
797          rc->overflow += s->desired_length - data->length + rc->KFoverflow_partial;                  rc->overflow += s->desired_length - data->length;
798    
799                    /* Distribute part of the keyframe overflow */
800                    rc->overflow += rc->KFoverflow_partial;
801    
802                    /* Don't forget to substract that same amount from the total keyframe
803                     * overflow */
804          rc->KFoverflow -= rc->KFoverflow_partial;          rc->KFoverflow -= rc->KFoverflow_partial;
805      }      }
806    
807          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);
808            rc->real_total += data->length;
809    
810            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",
811                          data->frame_num,                          data->frame_num,
812                          frame_type[data->type-1],                          frame_type[data->type-1],
813                          data->quant,                          data->quant,
814                          s->length,                          s->length,
815                          s->scaled_length,                          s->scaled_length,
                         data->length,  
816                          s->desired_length,                          s->desired_length,
817                            s->desired_length - s->error,
818                            -s->error,
819                          rc->overflow);                          rc->overflow);
820    
821      return(0);      return(0);
# Line 655  Line 825 
825   * Helper functions definition   * Helper functions definition
826   ****************************************************************************/   ****************************************************************************/
827    
828    /* Default buffer size for reading lines */
829  #define BUF_SZ   1024  #define BUF_SZ   1024
 #define MAX_COLS 5  
830    
831  /* open stats file, and count num frames */  /* Helper functions for reading/parsing the stats file */
832    static char *skipspaces(char *string);
833    static int iscomment(char *string);
834    static char *readline(FILE *f);
835    
836    /* This function counts the number of frame entries in the stats file
837     * It also counts the number of I Frames */
838  static int  static int
839  det_stats_length(rc_2pass2_t * rc, char * filename)  statsfile_count_frames(rc_2pass2_t * rc, char * filename)
840  {  {
841      FILE * f;      FILE * f;
842      int n, ignore;          char *line;
843      char type;          int lines;
844    
845      rc->num_frames = 0;      rc->num_frames = 0;
846      rc->num_keyframes = 0;      rc->num_keyframes = 0;
847    
848      if ((f = fopen(filename, "rt")) == NULL)          if ((f = fopen(filename, "rb")) == NULL)
849          return 0;                  return(-1);
850    
851      while((n = fscanf(f, "%c %d %d %d %d %d %d\n",          lines = 0;
852          &type, &ignore, &ignore, &ignore, &ignore, &ignore, &ignore)) != EOF) {          while ((line = readline(f)) != NULL) {
853          if (type == 'i') {  
854              rc->num_frames++;                  char *ptr;
855                    char type;
856                    int fields;
857    
858                    lines++;
859    
860                    /* We skip spaces */
861                    ptr = skipspaces(line);
862    
863                    /* Skip coment lines or empty lines */
864                    if(iscomment(ptr) || *ptr == '\0') {
865                            free(line);
866                            continue;
867                    }
868    
869                    /* Read the stat line from buffer */
870                    fields = sscanf(ptr, "%c", &type);
871    
872                    /* Valid stats files have at least 7 fields */
873                    if (fields == 1) {
874                            switch(type) {
875                            case 'i':
876                            case 'I':
877              rc->num_keyframes++;              rc->num_keyframes++;
878          }else if (type == 'p' || type == 'b' || type == 's') {                          case 'p':
879                            case 'P':
880                            case 'b':
881                            case 'B':
882                            case 's':
883                            case 'S':
884              rc->num_frames++;              rc->num_frames++;
885                                    break;
886                            default:
887                                    DPRINTF(XVID_DEBUG_RC,
888                                                    "[xvid rc] -- WARNING: L%d unknown frame type used (%c).\n",
889                                                    lines, type);
890          }          }
891                    } else {
892                                    DPRINTF(XVID_DEBUG_RC,
893                                                    "[xvid rc] -- WARNING: L%d misses some stat fields (%d).\n",
894                                                    lines, 7-fields);
895      }      }
896    
897                    /* Free the line buffer */
898                    free(line);
899            }
900    
901            /* We are done with the file */
902      fclose(f);      fclose(f);
903    
904      return 1;          return(0);
905  }  }
906    
907  /* open stats file(s) and read into rc->stats array */  /* open stats file(s) and read into rc->stats array */
   
908  static int  static int
909  load_stats(rc_2pass2_t *rc, char * filename)  statsfile_load(rc_2pass2_t *rc, char * filename)
910  {  {
911      FILE * f;      FILE * f;
912      int i, not_scaled;          int processed_entries;
   
913    
914      if ((f = fopen(filename, "rt"))==NULL)          /* Opens the file */
915          return 0;          if ((f = fopen(filename, "rb"))==NULL)
916                    return(-1);
917    
918      i = 0;          processed_entries = 0;
919          not_scaled = 0;          while(processed_entries < rc->num_frames) {
     while(i < rc->num_frames) {  
         stat_t * s = &rc->stats[i];  
         int n;  
920          char type;          char type;
921                    int fields;
922                    twopass_stat_t * s = &rc->stats[processed_entries];
923                    char *line, *ptr;
924    
925                    /* Read the line from the file */
926                    if((line = readline(f)) == NULL)
927                            break;
928    
929                    /* We skip spaces */
930                    ptr = skipspaces(line);
931    
932                    /* Skip comment lines or empty lines */
933                    if(iscomment(ptr) || *ptr == '\0') {
934                            free(line);
935                            continue;
936                    }
937    
938                    /* Reset this field that is optional */
939                  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;  
                 }  
940    
941          if (type == 'i') {                  /* Convert the fields */
942                    fields = sscanf(ptr,
943                                                    "%c %d %d %d %d %d %d %d\n",
944                                                    &type,
945                                                    &s->quant,
946                                                    &s->blks[0], &s->blks[1], &s->blks[2],
947                                                    &s->length, &s->invariant /* not really yet */,
948                                                    &s->scaled_length);
949    
950                    /* Free line buffer, we don't need it anymore */
951                    free(line);
952    
953                    /* Fail silently, this has probably been warned in
954                     * statsfile_count_frames */
955                    if(fields != 7 && fields != 8)
956                            continue;
957    
958                    /* Convert frame type and compute the invariant length part */
959                    switch(type) {
960                    case 'i':
961                    case 'I':
962              s->type = XVID_TYPE_IVOP;              s->type = XVID_TYPE_IVOP;
963          }else if (type == 'p' || type == 's') {                          s->invariant /= INVARIANT_HEADER_PART_IVOP;
964                            break;
965                    case 'p':
966                    case 'P':
967                    case 's':
968                    case 'S':
969              s->type = XVID_TYPE_PVOP;              s->type = XVID_TYPE_PVOP;
970          }else if (type == 'b') {                          s->invariant /= INVARIANT_HEADER_PART_PVOP;
971                            break;
972                    case 'b':
973                    case 'B':
974              s->type = XVID_TYPE_BVOP;              s->type = XVID_TYPE_BVOP;
975          }else{  /* unknown type */                          s->invariant /= INVARIANT_HEADER_PART_BVOP;
976              DPRINTF(XVID_DEBUG_RC, "unknown stats frame type; assuming pvop\n");                          break;
977              s->type = XVID_TYPE_PVOP;                  default:
978                            /* Same as before, fail silently */
979                            continue;
980          }          }
981    
982          i++;                  /* Ok it seems it's been processed correctly */
983                    processed_entries++;
984      }      }
985    
986      rc->num_frames = i;          /* Close the file */
   
987          fclose(f);          fclose(f);
988    
989      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);  
     }  
990  }  }
 #endif  
991    
992  /* pre-process the statistics data  /* pre-process the statistics data
993      - for each type, count, tot_length, min_length, max_length   * - for each type, count, tot_length, min_length, max_length
994      - set keyframes_locations   * - set keyframes_locations, tot_prescaled */
 */  
   
995  static void  static void
996  pre_process0(rc_2pass2_t * rc)  first_pass_stats_prepare_data(rc_2pass2_t * rc)
997  {  {
998      int i,j;      int i,j;
999    
1000          /*          /* *rc fields initialization
          * *rc fields initialization  
1001           * 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
1002           *     with real values of the 1pass           *     with real values of the 1pass */
          */  
1003           for (i=0; i<3; i++) {           for (i=0; i<3; i++) {
1004                  rc->count[i]=0;                  rc->count[i]=0;
1005                  rc->tot_length[i] = 0;                  rc->tot_length[i] = 0;
1006                    rc->tot_invariant[i] = 0;
1007                  rc->min_length[i] = INT_MAX;                  rc->min_length[i] = INT_MAX;
1008      }      }
1009    
1010          rc->max_length = INT_MIN;          rc->max_length = INT_MIN;
1011            rc->tot_weighted = 0;
1012    
1013          /*          /* Loop through all frames and find/compute all the stuff this function
1014           * Loop through all frames and find/compute all the stuff this function           * is supposed to do */
          * is supposed to do  
          */  
1015          for (i=j=0; i<rc->num_frames; i++) {          for (i=j=0; i<rc->num_frames; i++) {
1016                  stat_t * s = &rc->stats[i];                  twopass_stat_t * s = &rc->stats[i];
1017    
1018                  rc->count[s->type-1]++;                  rc->count[s->type-1]++;
1019                  rc->tot_length[s->type-1] += s->length;                  rc->tot_length[s->type-1] += s->length;
1020                    rc->tot_invariant[s->type-1] += s->invariant;
1021                    if (s->zone_mode != XVID_ZONE_QUANT)
1022                            rc->tot_weighted += (int)(s->weight*(s->length - s->invariant));
1023    
1024                  if (s->length < rc->min_length[s->type-1]) {                  if (s->length < rc->min_length[s->type-1]) {
1025                          rc->min_length[s->type-1] = s->length;                          rc->min_length[s->type-1] = s->length;
# Line 793  Line 1035 
1035                  }                  }
1036          }          }
1037    
1038          /*          /* NB:
          * Nota Bene:  
1039           * The "per sequence" overflow system considers a natural sequence to be           * The "per sequence" overflow system considers a natural sequence to be
1040           * 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
1041           * 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
1042           * frame to appear in the keyframe locations array.           * frame to appear in the keyframe locations array. */
          */  
1043      rc->keyframe_locations[j] = i;      rc->keyframe_locations[j] = i;
1044    
1045          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]);
1046          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]);
1047          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]);
1048  }  }
1049    
1050  /* calculate zone weight "center" */  /* calculate zone weight "center" */
   
1051  static void  static void
1052  zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)  zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)
1053  {  {
1054      int i,j;      int i,j;
1055      int n = 0;      int n = 0;
1056    
     rc->avg_weight = 0.0;  
1057      rc->tot_quant = 0;      rc->tot_quant = 0;
1058            rc->tot_quant_invariant = 0;
1059    
1060      if (create->num_zones == 0) {      if (create->num_zones == 0) {
1061          for (j = 0; j < rc->num_frames; j++) {          for (j = 0; j < rc->num_frames; j++) {
1062              rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;              rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1063              rc->stats[j].weight = 1.0;              rc->stats[j].weight = 1.0;
1064          }          }
         rc->avg_weight += rc->num_frames * 1.0;  
1065          n += rc->num_frames;          n += rc->num_frames;
1066      }      }
1067    
# Line 833  Line 1070 
1070    
1071          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;
1072    
1073                    /* Zero weight make no sense */
1074                    if (create->zones[i].increment == 0) create->zones[i].increment = 1;
1075                    /* And obviously an undetermined infinite makes even less sense */
1076                    if (create->zones[i].base == 0) create->zones[i].base = 1;
1077    
1078          if (i==0 && create->zones[i].frame > 0) {          if (i==0 && create->zones[i].frame > 0) {
1079              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++) {
1080                  rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;                  rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1081                  rc->stats[j].weight = 1.0;                  rc->stats[j].weight = 1.0;
1082              }              }
             rc->avg_weight += create->zones[i].frame * 1.0;  
1083              n += create->zones[i].frame;              n += create->zones[i].frame;
1084          }          }
1085    
# Line 848  Line 1089 
1089                  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;
1090              }              }
1091              next -= create->zones[i].frame;              next -= create->zones[i].frame;
             rc->avg_weight += (double)(next * create->zones[i].increment) / (double)create->zones[i].base;  
1092              n += next;              n += next;
1093          }else{  // XVID_ZONE_QUANT                  } else{  /* XVID_ZONE_QUANT */
1094              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++ ) {
1095                  rc->stats[j].zone_mode = XVID_ZONE_QUANT;                  rc->stats[j].zone_mode = XVID_ZONE_QUANT;
1096                  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;
1097                  rc->tot_quant += rc->stats[j].length;                  rc->tot_quant += rc->stats[j].length;
1098                                    rc->tot_quant_invariant += rc->stats[j].invariant;
1099              }              }
1100          }          }
1101      }      }
     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);  
1102  }  }
1103    
1104    
1105  /* scale the curve */  /* scale the curve */
   
1106  static void  static void
1107  internal_scale(rc_2pass2_t *rc)  first_pass_scale_curve_internal(rc_2pass2_t *rc)
1108  {  {
1109          int64_t target  = rc->target - rc->tot_quant;          int64_t target;
1110          int64_t pass1_length = rc->tot_length[0] + rc->tot_length[1] + rc->tot_length[2] - rc->tot_quant;          int64_t total_invariant;
1111          double scaler;          double scaler;
1112          int i, num_MBs;          int i, num_MBs;
1113          int min_size[3];  
1114            /* We only scale texture data ! */
1115            total_invariant  = rc->tot_invariant[XVID_TYPE_IVOP-1];
1116            total_invariant += rc->tot_invariant[XVID_TYPE_PVOP-1];
1117            total_invariant += rc->tot_invariant[XVID_TYPE_BVOP-1];
1118            /* don't forget to substract header bytes used in quant zones, otherwise we
1119             * counting them twice */
1120            total_invariant -= rc->tot_quant_invariant;
1121    
1122            /* We remove the bytes used by the fixed quantizer zones during first pass
1123             * with the same quants, so we know very precisely how much that
1124             * represents */
1125            target  = rc->target;
1126            target -= rc->tot_quant;
1127    
1128          /* Let's compute a linear scaler in order to perform curve scaling */          /* Let's compute a linear scaler in order to perform curve scaling */
1129          scaler = (double)target / (double)pass1_length;          scaler = (double)(target - total_invariant) / (double)(rc->tot_weighted);
1130    
1131          if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {  #ifdef SMART_OVERFLOW_SETTING
1132                  DPRINTF(XVID_DEBUG_RC, "WARNING: Undersize detected\n");          if (scaler > 0.9) {
1133          scaler = 1.0;                  rc->param.max_overflow_degradation *= 5;
1134                    rc->param.max_overflow_improvement *= 5;
1135                    rc->param.overflow_control_strength *= 3;
1136            } else if (scaler > 0.6) {
1137                    rc->param.max_overflow_degradation *= 2;
1138                    rc->param.max_overflow_improvement *= 2;
1139                    rc->param.overflow_control_strength *= 2;
1140            } else {
1141                    rc->min_quant = 2;
1142          }          }
1143    #endif
1144    
1145      DPRINTF(XVID_DEBUG_RC,          /* Compute min frame lengths (for each frame type) according to the number
1146                          "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
1147                          (int)target, (int)pass1_length, scaler);           * number of MBs.
1148             *
1149             * We compare these hardcoded values with observed values in first pass
1150             * (determined in pre_process0).Then we keep the real minimum. */
1151    
1152          /*          /* Number of MBs */
1153           * Compute min frame lengths (for each frame type) according to the number          num_MBs  = rc->stats[0].blks[0];
1154           * of MBs. We sum all blocks count from frame 0 (should be an IFrame, so          num_MBs += rc->stats[0].blks[1];
1155           * blocks[0] should be enough) to know how many MBs there are.          num_MBs += rc->stats[0].blks[2];
1156           */  
1157          num_MBs = rc->stats[0].blks[0] + rc->stats[0].blks[1] + rc->stats[0].blks[2];          /* Minimum for I frames */
1158          min_size[0] = ((num_MBs*22) + 240) / 8;          if(rc->min_length[XVID_TYPE_IVOP-1] > ((num_MBs*22) + 240) / 8)
1159          min_size[1] = ((num_MBs)    + 88)  / 8;                  rc->min_length[XVID_TYPE_IVOP-1] = ((num_MBs*22) + 240) / 8;
1160          min_size[2] = 8;  
1161            /* Minimum for P/S frames */
1162            if(rc->min_length[XVID_TYPE_PVOP-1] > ((num_MBs) + 88)  / 8)
1163                    rc->min_length[XVID_TYPE_PVOP-1] = ((num_MBs) + 88)  / 8;
1164    
1165            /* Minimum for B frames */
1166            if(rc->min_length[XVID_TYPE_BVOP-1] > 8)
1167                    rc->min_length[XVID_TYPE_BVOP-1] = 8;
1168    
1169          /*          /* Perform an initial scale pass.
1170           * Perform an initial scale pass.           *
1171           * If a frame size is scaled underneath our hardcoded minimums, then we           * If a frame size is scaled underneath our hardcoded minimums, then we
1172           * force the frame size to the minimum, and deduct the original & scaled           * force the frame size to the minimum, and deduct the original & scaled
1173           * frame length from the original and target total lengths           * frame length from the original and target total lengths */
          */  
1174          for (i=0; i<rc->num_frames; i++) {          for (i=0; i<rc->num_frames; i++) {
1175                  stat_t * s = &rc->stats[i];                  twopass_stat_t * s = &rc->stats[i];
1176                  int len;                  int len;
1177    
1178                    /* No need to scale frame length for which a specific quantizer is
1179                     * specified thanks to zones */
1180          if (s->zone_mode == XVID_ZONE_QUANT) {          if (s->zone_mode == XVID_ZONE_QUANT) {
1181              s->scaled_length = s->length;              s->scaled_length = s->length;
1182                          continue;                          continue;
1183                  }                  }
1184    
1185                  /* Compute the scaled length */                  /* Compute the scaled length -- only non invariant data length is scaled */
1186                  len = (int)((double)s->length * scaler * s->weight / rc->avg_weight);                  len = s->invariant + (int)((double)(s->length-s->invariant) * scaler * s->weight);
1187    
1188                  /* Compare with the computed minimum */                  /* Compare with the computed minimum */
1189                  if (len < min_size[s->type-1]) {                  if (len < rc->min_length[s->type-1]) {
1190                          /* force frame size to our computed minimum */                          /* This is a 'forced size' frame, set its frame size to the
1191                          s->scaled_length = min_size[s->type-1];                           * computed minimum */
1192                            s->scaled_length = rc->min_length[s->type-1];
1193    
1194                            /* Remove both scaled and original size from their respective
1195                             * total counters, as we prepare a second pass for 'regular'
1196                             * frames */
1197                          target -= s->scaled_length;                          target -= s->scaled_length;
                         pass1_length -= s->length;  
1198                  } else {                  } else {
1199                          /* Do nothing for now, we'll scale this later */                          /* Do nothing for now, we'll scale this later */
1200                          s->scaled_length = 0;                          s->scaled_length = 0;
1201                  }                  }
1202          }          }
1203    
1204          /* Correct the scaler for all non forced frames */          /* The first pass on data substracted all 'forced size' frames from the
1205          scaler = (double)target / (double)pass1_length;           * total counters. Now, it's possible to scale the 'regular' frames. */
1206    
1207          /* Detect undersizing */          /* Scaling factor for 'regular' frames */
1208      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);  
1209    
1210          /* Do another pass with the new scaler */          /* Do another pass with the new scaler */
1211          for (i=0; i<rc->num_frames; i++) {          for (i=0; i<rc->num_frames; i++) {
1212                  stat_t * s = &rc->stats[i];                  twopass_stat_t * s = &rc->stats[i];
1213    
1214                  /* Ignore frame with forced frame sizes */                  /* Ignore frame with forced frame sizes */
1215                  if (s->scaled_length == 0)                  if (s->scaled_length == 0)
1216                          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);
1217          }          }
1218    
1219            /* Job done */
1220            return;
1221  }  }
1222    
1223    /* Apply all user settings to the scaled curve
1224     * This implies:
1225     *   keyframe boosting
1226     *   high/low compression */
1227  static void  static void
1228  pre_process1(rc_2pass2_t * rc)  scaled_curve_apply_advanced_parameters(rc_2pass2_t * rc)
1229  {  {
1230      int i;      int i;
1231      double total1, total2;          int64_t ivop_boost_total;
     uint64_t ivop_boost_total;  
1232    
1233      ivop_boost_total = 0;          /* Reset the rate controller (per frame type) total byte counters */
1234      rc->curve_comp_error = 0;          for (i=0; i<3; i++) rc->tot_scaled_length[i] = 0;
1235    
1236      for (i=0; i<3; i++) {          /* Compute total bytes for each frame type */
1237          rc->tot_scaled_length[i] = 0;          for (i=0; i<rc->num_frames;i++) {
1238                    twopass_stat_t *s = &rc->stats[i];
1239                    rc->tot_scaled_length[s->type-1] += s->scaled_length;
1240      }      }
1241    
1242            /* First we compute the total amount of bits needed, as being described by
1243             * the scaled distribution. During this pass over the complete stats data,
1244             * we see how much bits two user settings will get/give from/to p&b frames:
1245             *  - keyframe boosting
1246             *  - keyframe distance penalty */
1247            rc->KF_idx = 0;
1248            ivop_boost_total = 0;
1249      for (i=0; i<rc->num_frames; i++) {      for (i=0; i<rc->num_frames; i++) {
1250          stat_t * s = &rc->stats[i];                  twopass_stat_t * s = &rc->stats[i];
   
         rc->tot_scaled_length[s->type-1] += s->scaled_length;  
1251    
1252                    /* Some more work is needed for I frames */
1253          if (s->type == XVID_TYPE_IVOP) {          if (s->type == XVID_TYPE_IVOP) {
1254              ivop_boost_total += s->scaled_length * rc->param.keyframe_boost / 100;                          int ivop_boost;
1255    
1256                            /* Accumulate bytes needed for keyframe boosting */
1257                            ivop_boost = s->scaled_length*rc->param.keyframe_boost/100;
1258    
1259    #if 0 /* ToDo: decide how to apply kfthresholding */
1260    #endif
1261                            /* If the frame size drops under the minimum length, then cap ivop_boost */
1262                            if (ivop_boost + s->scaled_length < rc->min_length[XVID_TYPE_IVOP-1])
1263                                    ivop_boost = rc->min_length[XVID_TYPE_IVOP-1] - s->scaled_length;
1264    
1265                            /* Accumulate the ivop boost */
1266                            ivop_boost_total += ivop_boost;
1267    
1268                            /* Don't forget to update the keyframe index */
1269                            rc->KF_idx++;
1270          }          }
1271      }      }
1272    
1273      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
1274                                          (rc->tot_scaled_length[XVID_TYPE_PVOP-1] + rc->tot_scaled_length[XVID_TYPE_BVOP-1]));           *
1275             * This ratio has to be applied to p/b/s frames in order to reserve
1276             * additional bits for keyframes (keyframe boosting) or if too much
1277             * keyframe distance is applied, bits retrieved from the keyframes.
1278             *
1279             * ie pb_length *= rc->pb_iboost_tax_ratio;
1280             *
1281             *    gives the ideal length of a p/b frame */
1282    
1283            /* Compute the total length of p/b/s frames (temporary storage into
1284             * movie_curve) */
1285            rc->pb_iboost_tax_ratio  = (double)rc->tot_scaled_length[XVID_TYPE_PVOP-1];
1286            rc->pb_iboost_tax_ratio += (double)rc->tot_scaled_length[XVID_TYPE_BVOP-1];
1287    
1288            /* Compute the ratio described above
1289             *     taxed_total = sum(0, n, tax*scaled_length)
1290             * <=> taxed_total = tax.sum(0, n, scaled_length)
1291             * <=> tax = taxed_total / original_total */
1292            rc->pb_iboost_tax_ratio =
1293                    (rc->pb_iboost_tax_ratio - ivop_boost_total) /
1294                    rc->pb_iboost_tax_ratio;
1295    
1296            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- IFrame boost tax ratio:%.2f\n",
1297                            rc->pb_iboost_tax_ratio);
1298    
1299            /* Compute the average size of frames per frame type */
1300      for(i=0; i<3; i++) {      for(i=0; i<3; i++) {
1301          if (rc->count[i] == 0 || rc->movie_curve == 0) {                  /* Special case for missing type or weird case */
1302                    if (rc->count[i] == 0 || rc->pb_iboost_tax_ratio == 0) {
1303              rc->avg_length[i] = 1;              rc->avg_length[i] = 1;
1304          }else{          }else{
1305              rc->avg_length[i] = rc->tot_scaled_length[i] / rc->count[i] / rc->movie_curve;                          rc->avg_length[i] = rc->tot_scaled_length[i];
1306          }  
1307                            if (i == (XVID_TYPE_IVOP-1)) {
1308                                    /* I Frames total has to be added the boost total */
1309                                    rc->avg_length[i] += ivop_boost_total;
1310                            } else {
1311                                    /* P/B frames has to taxed */
1312                                    rc->avg_length[i] *= rc->pb_iboost_tax_ratio;
1313      }      }
1314    
1315      /* --- */                          /* Finally compute the average frame size */
1316                            rc->avg_length[i] /= (double)rc->count[i];
1317                    }
1318            }
1319    
1320      total1=total2=0;          /* Assymetric curve compression */
1321            if (rc->param.curve_compression_high || rc->param.curve_compression_low) {
1322                    double symetric_total;
1323                    double assymetric_delta_total;
1324    
1325                    /* Like I frame boosting, assymetric curve compression modifies the total
1326                     * amount of needed bits, we must compute the ratio so we can prescale
1327                     lengths */
1328                    symetric_total = 0;
1329                    assymetric_delta_total = 0;
1330      for (i=0; i<rc->num_frames; i++) {      for (i=0; i<rc->num_frames; i++) {
1331          stat_t * s = &rc->stats[i];                          double assymetric_delta;
1332                            double dbytes;
1333                            twopass_stat_t * s = &rc->stats[i];
1334    
1335                            /* I Frames are not concerned by assymetric scaling */
1336                            if (s->type == XVID_TYPE_IVOP)
1337                                    continue;
1338    
1339          if (s->type != XVID_TYPE_IVOP) {                          /* During the real run, we would have to apply the iboost tax */
1340              double dbytes,dbytes2;                          dbytes = s->scaled_length * rc->pb_iboost_tax_ratio;
1341    
1342              dbytes = s->scaled_length / rc->movie_curve;                          /* Update the symmetric curve compression total */
1343              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];  
1344    
1345                          if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                          /* Apply assymetric curve compression */
1346                                  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])
1347                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * (double)rc->param.curve_compression_high / 100.0f;
1348                            else
1349                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * (double)rc->param.curve_compression_low  / 100.0f;
1350    
1351                            /* Cap to the minimum frame size if needed */
1352                            if (dbytes + assymetric_delta < rc->min_length[s->type-1])
1353                                    assymetric_delta = rc->min_length[s->type-1] - dbytes;
1354    
1355                            /* Accumulate after assymetric curve compression */
1356                            assymetric_delta_total += assymetric_delta;
1357                    }
1358    
1359                    /* Compute the tax that all p/b frames have to pay in order to respect the
1360                     * bit distribution changes that the assymetric compression curve imposes
1361                     * We want assymetric_total = sum(0, n-1, tax.scaled_length)
1362                     *      ie assymetric_total = ratio.sum(0, n-1, scaled_length)
1363                     *         ratio = assymetric_total / symmetric_total */
1364                    rc->assymetric_tax_ratio = ((double)symetric_total - (double)assymetric_delta_total) / (double)symetric_total;
1365                          } else {                          } else {
1366                                  dbytes2 = ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_low / 100.0);                  rc->assymetric_tax_ratio = 1.0f;
1367                          }                          }
1368    
1369              if (s->type == XVID_TYPE_BVOP) {          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Assymetric tax ratio:%.2f\n", rc->assymetric_tax_ratio);
1370                              dbytes2 *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
1371                              if (dbytes2 < rc->min_length[XVID_TYPE_BVOP-1])          /* Last bits that need to be reset */
1372                                      dbytes2 = rc->min_length[XVID_TYPE_BVOP-1];          rc->overflow = 0;
1373              }else{          rc->KFoverflow = 0;
1374                              if (dbytes2 < rc->min_length[XVID_TYPE_PVOP-1])          rc->KFoverflow_partial = 0;
1375                                      dbytes2 = rc->min_length[XVID_TYPE_PVOP-1];          rc->KF_idx = 0;
1376            rc->desired_total = 0;
1377            rc->real_total = 0;
1378    
1379            /* Job done */
1380            return;
1381              }              }
1382              total2 += dbytes2;  
1383    /*****************************************************************************
1384     * Still more low level stuff (nothing to do with stats treatment)
1385     ****************************************************************************/
1386    
1387    /* This function returns an allocated string containing a complete line read
1388     * from the file starting at the current position */
1389    static char *
1390    readline(FILE *f)
1391    {
1392            char *buffer = NULL;
1393            int buffer_size = 0;
1394            int pos = 0;
1395    
1396            do {
1397                    int c;
1398    
1399                    /* Read a character from the stream */
1400                    c = fgetc(f);
1401    
1402                    /* Is that EOF or new line ? */
1403                    if(c == EOF || c == '\n')
1404                            break;
1405    
1406                    /* Do we have to update buffer ? */
1407                    if(pos >= buffer_size - 1) {
1408                            buffer_size += BUF_SZ;
1409                            buffer = (char*)realloc(buffer, buffer_size);
1410                            if (buffer == NULL)
1411                                    return(NULL);
1412          }          }
1413    
1414                    buffer[pos] = c;
1415                    pos++;
1416            } while(1);
1417    
1418            /* Read \n or EOF */
1419            if (buffer == NULL) {
1420                    /* EOF, so we reached the end of the file, return NULL */
1421                    if(feof(f))
1422                            return(NULL);
1423    
1424                    /* Just an empty line with just a newline, allocate a 1 byte buffer to
1425                     * store a zero length string */
1426                    buffer = (char*)malloc(1);
1427                    if(buffer == NULL)
1428                            return(NULL);
1429      }      }
1430    
1431      rc->curve_comp_scale = total1 / total2;          /* Zero terminated string */
1432            buffer[pos] = '\0';
1433    
1434          DPRINTF(XVID_DEBUG_RC, "middle frame size for asymmetric curve compression: %i\n",          return(buffer);
1435              (int)(rc->avg_length[XVID_TYPE_PVOP-1] * rc->curve_comp_scale));  }
1436    
1437      rc->overflow = 0;  /* This function returns a pointer to the first non space char in the given
1438      rc->KFoverflow = 0;   * string */
1439      rc->KFoverflow_partial = 0;  static char *
1440      rc->KF_idx = 1;  skipspaces(char *string)
1441    {
1442            const char spaces[] =
1443                    {
1444                            ' ','\t','\0'
1445                    };
1446            const char *spacechar = spaces;
1447    
1448            if (string == NULL) return(NULL);
1449    
1450            while (*string != '\0') {
1451                    /* Test against space chars */
1452                    while (*spacechar != '\0') {
1453                            if (*string == *spacechar) {
1454                                    string++;
1455                                    spacechar = spaces;
1456                                    break;
1457                            }
1458                            spacechar++;
1459                    }
1460    
1461                    /* No space char */
1462                    if (*spacechar == '\0') return(string);
1463  }  }
1464    
1465            return(string);
1466    }
1467    
1468    /* This function returns a boolean that tells if the string is only a
1469     * comment */
1470    static int
1471    iscomment(char *string)
1472    {
1473            const char comments[] =
1474                    {
1475                            '#',';', '%', '\0'
1476                    };
1477            const char *cmtchar = comments;
1478            int iscomment = 0;
1479    
1480            if (string == NULL) return(1);
1481    
1482            string = skipspaces(string);
1483    
1484            while(*cmtchar != '\0') {
1485                    if(*string == *cmtchar) {
1486                            iscomment = 1;
1487                            break;
1488                    }
1489                    cmtchar++;
1490            }
1491    
1492            return(iscomment);
1493    }
1494    
1495    #if 0
1496    static void
1497    stats_print(rc_2pass2_t * rc)
1498    {
1499            int i;
1500            const char frame_type[4] = { 'i', 'p', 'b', 's'};
1501    
1502            for (i=0; i<rc->num_frames; i++) {
1503                    twopass_stat_t *s = &rc->stats[i];
1504                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- frame:%d type:%c quant:%d stats:%d scaled:%d desired:%d actual:%d overflow(%c):%.2f\n",
1505                                    i, frame_type[s->type-1], -1, s->length, s->scaled_length,
1506                                    s->desired_length, -1, frame_type[s->type-1], -1.0f);
1507            }
1508    }
1509    #endif
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