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revision 1046, Thu May 29 10:19:35 2003 UTC revision 1204, Thu Nov 13 22:35:30 2003 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 1.1.2.13 2003-05-29 10:19:35 edgomez Exp $   * $Id: plugin_2pass2.c,v 1.1.2.25 2003-11-13 22:35:30 edgomez Exp $
29   *   *
30   *****************************************************************************/   *****************************************************************************/
31    
32    #undef COMPENSATE_FORMULA
33    
34  #include <stdio.h>  #include <stdio.h>
35  #include <math.h>  #include <math.h>
36  #include <limits.h>  #include <limits.h>
# Line 41  Line 43 
43   ****************************************************************************/   ****************************************************************************/
44    
45  #define DEFAULT_KEYFRAME_BOOST 0  #define DEFAULT_KEYFRAME_BOOST 0
46  #define DEFAULT_PAYBACK_METHOD XVID_PAYBACK_PROP  #define DEFAULT_OVERFLOW_CONTROL_STRENGTH 10
 #define DEFAULT_BITRATE_PAYBACK_DELAY 250  
47  #define DEFAULT_CURVE_COMPRESSION_HIGH 0  #define DEFAULT_CURVE_COMPRESSION_HIGH 0
48  #define DEFAULT_CURVE_COMPRESSION_LOW 0  #define DEFAULT_CURVE_COMPRESSION_LOW 0
49  #define DEFAULT_MAX_OVERFLOW_IMPROVEMENT 60  #define DEFAULT_MAX_OVERFLOW_IMPROVEMENT 60
50  #define DEFAULT_MAX_OVERFLOW_DEGRADATION 60  #define DEFAULT_MAX_OVERFLOW_DEGRADATION 60
51    
 /* Alt curve settings */  
 #define DEFAULT_USE_ALT_CURVE 0  
 #define DEFAULT_ALT_CURVE_HIGH_DIST 500  
 #define DEFAULT_ALT_CURVE_LOW_DIST 90  
 #define DEFAULT_ALT_CURVE_USE_AUTO 1  
 #define DEFAULT_ALT_CURVE_AUTO_STR 30  
 #define DEFAULT_ALT_CURVE_TYPE XVID_CURVE_LINEAR  
 #define DEFAULT_ALT_CURVE_MIN_REL_QUAL 50  
 #define DEFAULT_ALT_CURVE_USE_AUTO_BONUS_BIAS 1  
 #define DEFAULT_ALT_CURVE_BONUS_BIAS 50  
   
52  /* Keyframe settings */  /* Keyframe settings */
 #define DEFAULT_KFTRESHOLD 10  
53  #define DEFAULT_KFREDUCTION 20  #define DEFAULT_KFREDUCTION 20
54  #define DEFAULT_MIN_KEY_INTERVAL 1  #define DEFAULT_MIN_KEY_INTERVAL 1
55    
# Line 72  Line 61 
61  typedef struct {  typedef struct {
62      int type;               /* first pass type */      int type;               /* first pass type */
63      int quant;              /* first pass quant */      int quant;              /* first pass quant */
64            int quant2;             /* Second pass quant */
65          int blks[3];                    /* k,m,y blks */          int blks[3];                    /* k,m,y blks */
66      int length;             /* first pass length */      int length;             /* first pass length */
67      int scaled_length;      /* scaled length */      int scaled_length;      /* scaled length */
68      int desired_length;     /* desired length; calcuated during encoding */          int desired_length;     /* desired length; calculated during encoding */
69            int error;
70    
71      int zone_mode;   /* XVID_ZONE_xxx */      int zone_mode;   /* XVID_ZONE_xxx */
72      double weight;      double weight;
73  } stat_t;  } twopass_stat_t;
74    
75  /* Context struct */  /* Context struct */
76  typedef struct  typedef struct
77  {  {
78      xvid_plugin_2pass2_t param;      xvid_plugin_2pass2_t param;
79    
80      /* constant statistical data */          /*----------------------------------
81             * constant statistical data
82             *--------------------------------*/
83    
84            /* Number of frames of the sequence */
85          int num_frames;          int num_frames;
     int num_keyframes;  
     uint64_t target;    /* target filesize */  
86    
87      int count[3];   /* count of each frame types */          /* Number of Intra frames of the sequence */
88      uint64_t tot_length[3];  /* total length of each frame types */          int num_keyframes;
     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 */  
89    
90      /* zone statistical data */          /* Target filesize to reach */
91      double avg_weight;  /* average weight */          uint64_t target;
     int64_t tot_quant;   /* total length used by XVID_ZONE_QUANT zones */  
92    
93            /* Count of each frame types */
94            int count[3];
95    
96      double curve_comp_scale;          /* Total length of each frame types (1st pass) */
97      double movie_curve;          uint64_t tot_length[3];
98    
99      /* dynamic */          /* Average length of each frame types (used first for 1st pass data and
100             * then for scaled averages */
101            double avg_length[3];
102    
103            /* Minimum frame length allowed for each frame type */
104            int min_length[3];
105    
106            /* Total bytes per frame type once the curve has been scaled
107             * NB: advanced parameters do not change this value. This field
108             *     represents the total scaled w/o any advanced settings */
109            uint64_t tot_scaled_length[3];
110    
111            /* Maximum observed frame size observed during the first pass, the RC
112             * will try tp force all frame sizes in the second pass to be under that
113             * limit */
114            int max_length;
115    
116            /*----------------------------------
117             * Zones statistical data
118             *
119             * ToDo: Fix zones, current
120             *       implementation is buggy
121             *--------------------------------*/
122    
123            /* Average weight of the zones */
124            double avg_weight;
125    
126            /* Total length used by XVID_ZONE_QUANT zones */
127            int64_t tot_quant;
128    
129            /*----------------------------------
130             * Advanced settings helper ratios
131             *--------------------------------*/
132    
133            /* This the ratio that has to be applied to all p/b frames in order
134             * to reserve/retrieve bits for/from keyframe boosting and consecutive
135             * keyframe penalty */
136            double pb_iboost_tax_ratio;
137    
138            /* This the ratio to apply to all b/p frames in order to respect the
139             * assymetric curve compression while respecting a target filesize
140             * NB: The assymetric delta gain has to be computed before this ratio
141             *     is applied, and then the delta is added to the scaled size */
142            double assymetric_tax_ratio;
143    
144            /*----------------------------------
145             * Data from the stats file kept
146             * into RAM for easy access
147             *--------------------------------*/
148    
149            /* Array of keyframe locations
150             * eg: rc->keyframe_locations[100] returns the frame number of the 100th
151             *     keyframe */
152      int * keyframe_locations;      int * keyframe_locations;
     stat_t * stats;  
153    
154      double pquant_error[32];          /* Index of the last keyframe used in the keyframe_location */
155      double bquant_error[32];          int KF_idx;
156      int quant_count[32];  
157            /* Array of all 1st pass data file -- see the twopass_stat_t structure
158             * definition for more details */
159            twopass_stat_t * stats;
160    
161            /*----------------------------------
162             * Histerysis helpers
163             *--------------------------------*/
164    
165            /* This field holds the int2float conversion errors of each quant per
166             * frame type, this allow the RC to keep track of rouding error and thus
167             * increase or decrease the chosen quant according to this residue */
168            double quant_error[3][32];
169    
170            /* This fields stores the count of each quant usage per frame type
171             * No real role but for debugging */
172            int quant_count[3][32];
173    
174            /* Last valid quantizer used per frame type, it allows quantizer
175             * increament/decreament limitation in order to avoid big image quality
176             * "jumps" */
177      int last_quant[3];      int last_quant[3];
178    
179      double curve_comp_error;          /*----------------------------------
180      int overflow;           * Overflow control
181      int KFoverflow;           *--------------------------------*/
182      int KFoverflow_partial;  
183      int KF_idx;          /* Current overflow that has to be distributed to p/b frames */
184            double overflow;
185    
186            /* Total overflow for keyframes -- not distributed directly */
187            double KFoverflow;
188    
189            /* Amount of keyframe overflow to introduce to the global p/b frame
190             * overflow counter at each encoded frame */
191            double KFoverflow_partial;
192    
193            /* Unknown ???
194             * ToDo: description */
195      double fq_error;      double fq_error;
196    
197            /*----------------------------------
198             * Debug
199             *--------------------------------*/
200            double desired_total;
201            double real_total;
202  } rc_2pass2_t;  } rc_2pass2_t;
203    
204    
# Line 167  Line 243 
243   ****************************************************************************/   ****************************************************************************/
244    
245  /* First a few local helping function prototypes */  /* First a few local helping function prototypes */
246  static  int det_stats_length(rc_2pass2_t * rc, char * filename);  static  int statsfile_count_frames(rc_2pass2_t * rc, char * filename);
247  static  int load_stats(rc_2pass2_t *rc, char * filename);  static  int statsfile_load(rc_2pass2_t *rc, char * filename);
248  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);
249  static void internal_scale(rc_2pass2_t *rc);  static void first_pass_stats_prepare_data(rc_2pass2_t * rc);
250  static void pre_process0(rc_2pass2_t * rc);  static void first_pass_scale_curve_internal(rc_2pass2_t *rc);
251  static void pre_process1(rc_2pass2_t * rc);  static void scaled_curve_apply_advanced_parameters(rc_2pass2_t * rc);
252    #if 0
253    static void stats_print(rc_2pass2_t * rc);
254    #endif
255    
256  /*----------------------------------------------------------------------------  /*----------------------------------------------------------------------------
257   *--------------------------------------------------------------------------*/   *--------------------------------------------------------------------------*/
# Line 190  Line 269 
269    
270      rc->param = *param;      rc->param = *param;
271    
272            /* Initialize all defaults */
273  #define _INIT(a, b) if((a) <= 0) (a) = (b)  #define _INIT(a, b) if((a) <= 0) (a) = (b)
274      /* Let's set our defaults if needed */      /* Let's set our defaults if needed */
275          _INIT(rc->param.keyframe_boost, DEFAULT_KEYFRAME_BOOST);          _INIT(rc->param.keyframe_boost, DEFAULT_KEYFRAME_BOOST);
276          _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);  
277      _INIT(rc->param.curve_compression_high, DEFAULT_CURVE_COMPRESSION_HIGH);      _INIT(rc->param.curve_compression_high, DEFAULT_CURVE_COMPRESSION_HIGH);
278      _INIT(rc->param.curve_compression_low, DEFAULT_CURVE_COMPRESSION_LOW);      _INIT(rc->param.curve_compression_low, DEFAULT_CURVE_COMPRESSION_LOW);
279      _INIT(rc->param.max_overflow_improvement, DEFAULT_MAX_OVERFLOW_IMPROVEMENT);      _INIT(rc->param.max_overflow_improvement, DEFAULT_MAX_OVERFLOW_IMPROVEMENT);
280      _INIT(rc->param.max_overflow_degradation,  DEFAULT_MAX_OVERFLOW_DEGRADATION);      _INIT(rc->param.max_overflow_degradation,  DEFAULT_MAX_OVERFLOW_DEGRADATION);
281    
282      /* Keyframe settings */      /* Keyframe settings */
         _INIT(rc->param.kftreshold, DEFAULT_KFTRESHOLD);  
283      _INIT(rc->param.kfreduction, DEFAULT_KFREDUCTION);      _INIT(rc->param.kfreduction, DEFAULT_KFREDUCTION);
284      _INIT(rc->param.min_key_interval, DEFAULT_MIN_KEY_INTERVAL);      _INIT(rc->param.min_key_interval, DEFAULT_MIN_KEY_INTERVAL);
285  #undef _INIT  #undef _INIT
286    
287          /* Count frames in the stats file */          /* Initialize some stuff to zero */
288      if (!det_stats_length(rc, param->filename)) {          for(i=0; i<3; i++) {
289          DPRINTF(XVID_DEBUG_RC,"fopen %s failed\n", param->filename);                  int j;
290                    for (j=0; j<32; j++) {
291                            rc->quant_error[i][j] = 0;
292                            rc->quant_count[i][j] = 0;
293                    }
294            }
295    
296            for (i=0; i<3; i++) rc->last_quant[i] = 0;
297    
298            rc->fq_error = 0;
299    
300            /* Count frames (and intra frames) in the stats file, store the result into
301             * the rc structure */
302            if (statsfile_count_frames(rc, param->filename) == -1) {
303                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- ERROR: fopen %s failed\n", param->filename);
304          free(rc);          free(rc);
305          return XVID_ERR_FAIL;                  return(XVID_ERR_FAIL);
306      }      }
307    
308      /* Allocate the stats' memory */      /* Allocate the stats' memory */
309          if ((rc->stats = malloc(rc->num_frames * sizeof(stat_t))) == NULL) {          if ((rc->stats = malloc(rc->num_frames * sizeof(twopass_stat_t))) == NULL) {
310          free(rc);          free(rc);
311          return XVID_ERR_MEMORY;                  return(XVID_ERR_MEMORY);
312      }      }
313    
314      /*          /* Allocate keyframes location's memory
315           * Allocate keyframes location's memory           * PS: see comment in pre_process0 for the +1 location requirement */
316           * PS: see comment in pre_process0 for the +1 location requirement          rc->keyframe_locations = malloc((rc->num_keyframes + 1) * sizeof(int));
317           */          if (rc->keyframe_locations == NULL) {
     if ((rc->keyframe_locations = malloc((rc->num_keyframes + 1) * sizeof(int))) == NULL) {  
318          free(rc->stats);          free(rc->stats);
319          free(rc);          free(rc);
320          return XVID_ERR_MEMORY;                  return(XVID_ERR_MEMORY);
321      }      }
322    
323      if (!load_stats(rc, param->filename)) {          /* Load the first pass stats */
324          DPRINTF(XVID_DEBUG_RC,"fopen %s failed\n", param->filename);          if (statsfile_load(rc, param->filename) == -1) {
325                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- ERROR: fopen %s failed\n", param->filename);
326          free(rc->keyframe_locations);          free(rc->keyframe_locations);
327          free(rc->stats);          free(rc->stats);
328          free(rc);          free(rc);
329          return XVID_ERR_FAIL;          return XVID_ERR_FAIL;
330      }      }
331    
332      /* pre-process our stats */          /* Compute the target filesize */
333            if (rc->param.bitrate<0) {
334          if (rc->num_frames  < create->fbase/create->fincr) {                  /* if negative, bitrate equals the target (in kbytes) */
335                  rc->target = rc->param.bitrate / 8;     /* one second */                  rc->target = (-rc->param.bitrate) * 1024;
336            } else if (rc->num_frames  < create->fbase/create->fincr) {
337                    /* Source sequence is less than 1s long, we do as if it was 1s long */
338                    rc->target = rc->param.bitrate / 8;
339          } else {          } else {
340                    /* Target filesize = bitrate/8 * numframes / framerate */
341                  rc->target =                  rc->target =
342                          ((uint64_t)rc->param.bitrate * (uint64_t)rc->num_frames * (uint64_t)create->fincr) / \                          ((uint64_t)rc->param.bitrate * (uint64_t)rc->num_frames * \
343                             (uint64_t)create->fincr) / \
344                          ((uint64_t)create->fbase * 8);                          ((uint64_t)create->fbase * 8);
345          }          }
346    
347      DPRINTF(XVID_DEBUG_RC, "Number of frames: %d\n", rc->num_frames);          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Frame rate: %d/%d (%ffps)\n",
348          DPRINTF(XVID_DEBUG_RC, "Frame rate: %d/%d\n", create->fbase, create->fincr);                          create->fbase, create->fincr,
349          DPRINTF(XVID_DEBUG_RC, "Target bitrate: %ld\n", rc->param.bitrate);                          (double)create->fbase/(double)create->fincr);
350          DPRINTF(XVID_DEBUG_RC, "Target filesize: %lld\n", rc->target);          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Number of frames: %d\n", rc->num_frames);
351            if(rc->param.bitrate>=0)
352                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Target bitrate: %ld\n", rc->param.bitrate);
353            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Target filesize: %lld\n", rc->target);
354    
355          /* Compensate the mean frame overhead caused by the container */          /* Compensate the average frame overhead caused by the container */
356          rc->target -= rc->num_frames*rc->param.container_frame_overhead;          rc->target -= rc->num_frames*rc->param.container_frame_overhead;
357          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);
358          DPRINTF(XVID_DEBUG_RC, "Target filesize (after container compensation): %lld\n", rc->target);          if(rc->param.container_frame_overhead)
359                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- New target filesize after container compensation: %lld\n", rc->target);
360          pre_process0(rc);  
361            /* Gathers some information about first pass stats:
362             *  - finds the minimum frame length for each frame type during 1st pass.
363             *     rc->min_size[]
364             *  - determines the maximum frame length observed (no frame type distinction).
365             *     rc->max_size
366             *  - count how many times each frame type has been used.
367             *     rc->count[]
368             *  - total bytes used per frame type
369             *     rc->total[]
370             *  - store keyframe location
371             *     rc->keyframe_locations[]
372             */
373            first_pass_stats_prepare_data(rc);
374    
375            /* When bitrate is not given it means it has been scaled by an external
376             * application */
377          if (rc->param.bitrate) {          if (rc->param.bitrate) {
378                    /* Apply zone settings */
379          zone_process(rc, create);          zone_process(rc, create);
380                  internal_scale(rc);                  /* Perform internal curve scaling */
381                    first_pass_scale_curve_internal(rc);
382      }else{      }else{
383          /* external scaler: ignore zone */                  /* External scaling -- zones are ignored */
384          for (i=0;i<rc->num_frames;i++) {          for (i=0;i<rc->num_frames;i++) {
385              rc->stats[i].zone_mode = XVID_ZONE_WEIGHT;              rc->stats[i].zone_mode = XVID_ZONE_WEIGHT;
386              rc->stats[i].weight = 1.0;              rc->stats[i].weight = 1.0;
# Line 271  Line 388 
388          rc->avg_weight = 1.0;          rc->avg_weight = 1.0;
389          rc->tot_quant = 0;          rc->tot_quant = 0;
390      }      }
         pre_process1(rc);  
391    
392      for (i=0; i<32;i++) {          /* Apply advanced curve options, and compute some parameters in order to
393          rc->pquant_error[i] = 0;           * shape the curve in the BEFORE/AFTER pair of functions */
394          rc->bquant_error[i] = 0;          scaled_curve_apply_advanced_parameters(rc);
         rc->quant_count[i] = 0;  
     }  
   
     rc->fq_error = 0;  
395    
396      *handle = rc;      *handle = rc;
397          return(0);          return(0);
# Line 291  Line 403 
403  static int  static int
404  rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy)  rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy)
405  {  {
406            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- target_total:%lld desired_total:%.2f (%.2f%%) actual_total:%.2f (%.2f%%)\n",
407                            rc->target,
408                            rc->desired_total,
409                            100*rc->desired_total/(double)rc->target,
410                            rc->real_total,
411                            100*rc->real_total/(double)rc->target);
412    
413      free(rc->keyframe_locations);      free(rc->keyframe_locations);
414      free(rc->stats);      free(rc->stats);
415          free(rc);          free(rc);
# Line 303  Line 422 
422  static int  static int
423  rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)  rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)
424  {  {
425      stat_t * s = &rc->stats[data->frame_num];          twopass_stat_t * s = &rc->stats[data->frame_num];
     int overflow;  
     int desired;  
426      double dbytes;      double dbytes;
427      double curve_temp;          double scaled_quant;
428            double overflow;
429      int capped_to_max_framesize = 0;      int capped_to_max_framesize = 0;
430    
431          /*          /* This function is quite long but easy to understand. In order to simplify
432           * 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.  
          */  
433    
434          /* First case: Another plugin has already set a quantizer */          /* First case: Another plugin has already set a quantizer */
435      if (data->quant > 0)      if (data->quant > 0)
# Line 321  Line 437 
437    
438          /* Second case: We are in a Quant zone */          /* Second case: We are in a Quant zone */
439          if (s->zone_mode == XVID_ZONE_QUANT) {          if (s->zone_mode == XVID_ZONE_QUANT) {
   
440                  rc->fq_error += s->weight;                  rc->fq_error += s->weight;
441                  data->quant = (int)rc->fq_error;                  data->quant = (int)rc->fq_error;
442                  rc->fq_error -= data->quant;                  rc->fq_error -= data->quant;
# Line 329  Line 444 
444                  s->desired_length = s->length;                  s->desired_length = s->length;
445    
446                  return(0);                  return(0);
   
447          }          }
448    
449          /* Third case: insufficent stats data */          /* Third case: insufficent stats data */
450          if (data->frame_num >= rc->num_frames)          if (data->frame_num >= rc->num_frames)
451                  return 0;                  return(0);
   
         /*  
          * The last case is the one every normal minded developer should fear to  
          * maintain in a project :-)  
          */  
452    
453          /* XXX: why by 8 */          /*************************************************************************/
454          overflow = rc->overflow / 8;          /*************************************************************************/
455            /*************************************************************************/
456    
457          /*          /*-------------------------------------------------------------------------
458           * The rc->overflow field represents the overflow in current scene (between two           * Frame bit allocation first part
459           * IFrames) so we must not forget to reset it if we are entering a new scene           *
460           */           * First steps apply user settings, just like it is done in the theoritical
461          if (s->type == XVID_TYPE_IVOP)           * scaled_curve_apply_advanced_parameters
462                  overflow = 0;           *-----------------------------------------------------------------------*/
463    
464          desired = s->scaled_length;          /* Set desired to what we are wanting to obtain for this frame */
465            dbytes = (double)s->scaled_length;
466    
467          dbytes = desired;          /* IFrame user settings*/
468          if (s->type == XVID_TYPE_IVOP)          if (s->type == XVID_TYPE_IVOP) {
                 dbytes += desired * rc->param.keyframe_boost / 100;  
         dbytes /= rc->movie_curve;  
469    
470          /*                  /* Keyframe boosting -- All keyframes benefit from it */
471           * We are now entering in the hard part of the algo, it was first designed                  dbytes += dbytes*rc->param.keyframe_boost / 100;
          * to work with i/pframes only streams, so the way it computes things is  
          * adapted to pframes only. However we can use it if we just take care to  
          * scale the bframes sizes to pframes sizes using the ratio avg_p/avg_p and  
          * then before really using values depending on frame sizes, scaling the  
          * value again with the inverse ratio  
          */  
         if (s->type == XVID_TYPE_BVOP)  
                 dbytes *= rc->avg_length[XVID_TYPE_PVOP-1] / rc->avg_length[XVID_TYPE_BVOP-1];  
472    
473          /*                  /* Applies keyframe penalties, but not the first frame */
474           * Apply user's choosen Payback method. Payback helps bitrate to follow the                  if (rc->KF_idx) {
475           * scaled curve "paying back" past errors in curve previsions.                          int penalty_distance;
476           */  
477          if (rc->param.payback_method == XVID_PAYBACK_BIAS) {                          /* Minimum keyframe distance penalties */
478                  desired =(int)(rc->curve_comp_error / rc->param.bitrate_payback_delay);                          penalty_distance  = rc->param.min_key_interval;
479                            penalty_distance -= rc->keyframe_locations[rc->KF_idx];
480                            penalty_distance += rc->keyframe_locations[rc->KF_idx-1];
481    
482                            /* Ah ah ! guilty keyframe, you're under arrest ! */
483                            if (penalty_distance > 0)
484                                    dbytes -= dbytes*penalty_distance*rc->param.kfreduction/100;
485                    }
486          } else {          } else {
                 desired = (int)(rc->curve_comp_error * dbytes /  
                                                 rc->avg_length[XVID_TYPE_PVOP-1] / rc->param.bitrate_payback_delay);  
487    
488                  if (labs(desired) > fabs(rc->curve_comp_error)) {                  /* P/S/B frames must reserve some bits for iframe boosting */
489                          desired = (int)rc->curve_comp_error;                  dbytes *= rc->pb_iboost_tax_ratio;
490    
491                    /* Apply assymetric curve compression */
492                    if (rc->param.curve_compression_high || rc->param.curve_compression_low) {
493                            double assymetric_delta;
494    
495                            /* Compute the assymetric delta, this is computed before applying
496                             * the tax, as done in the pre_process function */
497                            if (dbytes > rc->avg_length[s->type-1])
498                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_high / 100.0;
499                            else
500                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_low  / 100.0;
501    
502                            /* Now we must apply the assymetric tax, else our curve compression
503                             * would not give a theoritical target size equal to what it is
504                             * expected */
505                            dbytes *= rc->assymetric_tax_ratio;
506    
507                            /* Now we can add the assymetric delta */
508                            dbytes += assymetric_delta;
509                  }                  }
510          }          }
511    
512          rc->curve_comp_error -= desired;          /* That is what we would like to have -- Don't put that chunk after
513             * overflow control, otherwise, overflow is counted twice and you obtain
514             * half sized bitrate sequences */
515            s->desired_length  = (int)dbytes;
516            rc->desired_total += dbytes;
517    
518          /*          /*------------------------------------------------------------------------
519           * Alt curve treatment is not that hard to understand though the formulas           * Frame bit allocation: overflow control part.
520           * seem to be huge. Alt treatment is basically a way to soft/harden the           *
521           * curve flux applying sine/linear/cosine ratios           * Unlike the theoritical scaled_curve_apply_advanced_parameters, here
522           */           * it's real encoding and we need to make sure we don't go so far from
523             * what is our ideal scaled curve.
524             *-----------------------------------------------------------------------*/
525    
526          /* XXX: warning */          /* Compute the overflow we should compensate */
527          curve_temp = 0;          if (s->type != XVID_TYPE_IVOP) {
528                    double frametype_factor;
529                    double framesize_factor;
530    
531          if ((rc->param.curve_compression_high + rc->param.curve_compression_low) &&     s->type != XVID_TYPE_IVOP) {                  /* Take only the desired part of overflow */
532                    overflow = rc->overflow;
533    
534                  curve_temp = rc->curve_comp_scale;                  /* Factor that will take care to decrease the overflow applied
535                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                   * according to the importance of this frame type in term of
536                          curve_temp *= ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_high / 100.0);                   * overall size */
537                  } else {                  frametype_factor  = rc->count[XVID_TYPE_IVOP-1]*rc->avg_length[XVID_TYPE_IVOP-1];
538                          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];
539                  }                  frametype_factor += rc->count[XVID_TYPE_BVOP-1]*rc->avg_length[XVID_TYPE_BVOP-1];
540                    frametype_factor /= rc->count[s->type-1]*rc->avg_length[s->type-1];
541                    frametype_factor  = 1/frametype_factor;
542    
543                    /* Factor that will take care not to compensate too much for this frame
544                     * size */
545                    framesize_factor  = dbytes;
546                    framesize_factor /= rc->avg_length[s->type-1];
547    
548                  /*                  /* Treat only the overflow part concerned by this frame type and size */
549                   * End of code path for curve_temp, as told earlier, we are now                  overflow *= frametype_factor;
550                   * obliged to scale the value to a bframe one using the inverse  #if 0
551                   * ratio applied earlier                  /* Leave this one alone, as it impacts badly on quality */
552                   */                  overflow *= framesize_factor;
553                  if (s->type == XVID_TYPE_BVOP)  #endif
                         curve_temp *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
554    
555                  desired += (int)curve_temp;                  /* Apply the overflow strength imposed by the user */
556                  rc->curve_comp_error += curve_temp - (int)curve_temp;                  overflow *= (rc->param.overflow_control_strength/100.0f);
557          } else {          } else {
558                  /*                  /* no overflow applied in IFrames because:
559                   * End of code path for dbytes, as told earlier, we are now                   *  - their role is important as they're references for P/BFrames.
560                   * 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
561                   * ratio applied earlier                   *    much, this overflow may impact the next IFrame too much and generate
562                   */                   *    a sequence of poor quality frames */
563                  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;  
564          }          }
565    
566            /* Make sure we are not trying to compensate more overflow than we even have */
567            if (fabs(overflow) > fabs(rc->overflow))
568                    overflow = rc->overflow;
569    
570          /*          /* Make sure the overflow doesn't make the frame size to get out of the range
571           * We can't do bigger frames than first pass, this would be stupid as first           * [-max_degradation..+max_improvment] */
572           * 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) {
573           * many bytes and we would not not gain much quality.                  if(overflow <= dbytes)
574           */                          dbytes += dbytes * rc->param.max_overflow_improvement / 100;
575          if (desired > s->length) {                  else
576                  rc->curve_comp_error += desired - s->length;                          dbytes += overflow * rc->param.max_overflow_improvement / 100;
577                  desired = s->length;          } else if (overflow < - dbytes * rc->param.max_overflow_degradation / 100) {
578                    dbytes -= dbytes * rc->param.max_overflow_degradation / 100;
579          } else {          } else {
580                  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;  
581                          }                          }
                         desired = rc->min_length[s->type-1];  
                 }  
         }  
   
         s->desired_length = desired;  
   
582    
583          /* if this keyframe is too close to the next, reduce it's byte allotment          /*-------------------------------------------------------------------------
584             XXX: why do we do this after setting the desired length  */           * Frame bit allocation last part:
585             *
586          if (s->type == XVID_TYPE_IVOP) {           * Cap frame length so we don't reach neither bigger frame sizes than first
587                  int KFdistance = rc->keyframe_locations[rc->KF_idx] - rc->keyframe_locations[rc->KF_idx - 1];           * pass nor smaller than the allowed minimum.
588             *-----------------------------------------------------------------------*/
589                  if (KFdistance < rc->param.kftreshold) {  
590            if (dbytes > s->length) {
591                    dbytes = s->length;
592            } else if (dbytes < rc->min_length[s->type-1]) {
593                    dbytes = rc->min_length[s->type-1];
594            } else if (dbytes > rc->max_length) {
595                    /* ToDo: this condition is always wrong as max_length == maximum frame
596                     * length of first pass, so the first condition already caps the frame
597                     * size... */
598                    capped_to_max_framesize = 1;
599                    dbytes = rc->max_length;
600                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- frame:%d Capped to maximum frame size\n",
601                                    data->frame_num);
602            }
603    
604                          KFdistance -= rc->param.min_key_interval;          /*------------------------------------------------------------------------
605             * Desired frame length <-> quantizer mapping
606             *-----------------------------------------------------------------------*/
607    
608                          if (KFdistance >= 0) {          /* For bframes we must retrieve the original quant used (sent to xvidcore)
609                                  int KF_min_size;           * as core applies the bquant formula before writing the stat log entry */
610            if(s->type == XVID_TYPE_BVOP) {
611    
612                                  KF_min_size = desired * (100 - rc->param.kfreduction) / 100;                  twopass_stat_t *b_ref = s;
                                 if (KF_min_size < 1)  
                                         KF_min_size = 1;  
613    
614                                  desired = KF_min_size + (desired - KF_min_size) * KFdistance /                  /* Find the reference frame */
615                                          (rc->param.kftreshold - rc->param.min_key_interval);                  while(b_ref != &rc->stats[0] && b_ref->type == XVID_TYPE_BVOP)
616                            b_ref--;
617    
618                                  if (desired < 1)                  /* Compute the original quant */
619                                          desired = 1;                  s->quant  = 100*s->quant - data->bquant_offset;
620                          }                  s->quant += data->bquant_ratio - 1; /* to avoid rouding issues */
621                  }                  s->quant  = s->quant/data->bquant_ratio - b_ref->quant;
622          }          }
623    
624          overflow = (int)((double)overflow * desired / rc->avg_length[XVID_TYPE_PVOP-1]);          /* Don't laugh at this very 'simple' quant<->filesize relationship, it
625             * proves to be acurate enough for our algorithm */
626          /* Reign in overflow with huge frames */          scaled_quant = (double)s->quant*(double)s->length/(double)dbytes;
         if (labs(overflow) > labs(rc->overflow))  
                 overflow = rc->overflow;  
627    
628          /* Make sure overflow doesn't run away */  #ifdef COMPENSATE_FORMULA
629          if (overflow > desired * rc->param.max_overflow_improvement / 100) {          /* We know xvidcore will apply the bframe formula again, so we compensate
630                  desired += (overflow <= desired) ? desired * rc->param.max_overflow_improvement / 100 :           * it right now to make sure we would not apply it twice */
631                          overflow * rc->param.max_overflow_improvement / 100;          if(s->type == XVID_TYPE_BVOP) {
         } else if (overflow < desired * rc->param.max_overflow_degradation / -100){  
                 desired += desired * rc->param.max_overflow_degradation / -100;  
         } else {  
                 desired += overflow;  
         }  
632    
633          /* 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);  
         }  
634    
635          /* Make sure to not scale below the minimum framesize */                  /* Find the reference frame */
636          if (desired < rc->min_length[s->type-1]) {                  while(b_ref != &rc->stats[0] && b_ref->type == XVID_TYPE_BVOP)
637                  desired = rc->min_length[s->type-1];                          b_ref--;
638                  DPRINTF(XVID_DEBUG_RC,"[%i] Capped to minimum frame size\n",  
639                                  data->frame_num);                  /* Compute the quant it would be if the core did not apply the bframe
640                     * formula */
641                    scaled_quant  = 100*scaled_quant - data->bquant_offset;
642                    scaled_quant += data->bquant_ratio - 1; /* to avoid rouding issues */
643                    scaled_quant /= data->bquant_ratio;
644          }          }
645    #endif
646    
647          /*          /* Quantizer has been scaled using floating point operations/results, we
648           * Don't laugh at this very 'simple' quant<->filesize relationship, it           * must cast it to integer */
649           * proves to be acurate enough for our algorithm          data->quant = (int)scaled_quant;
          */  
         data->quant = s->quant*s->length/desired;  
650    
651          /* Let's clip the computed quantizer, if needed */          /* Let's clip the computed quantizer, if needed */
652          if (data->quant < 1) {          if (data->quant < 1) {
653                  data->quant = 1;                  data->quant = 1;
654          } else if (data->quant > 31) {          } else if (data->quant > 31) {
655                  data->quant = 31;                  data->quant = 31;
         } else if (s->type != XVID_TYPE_IVOP) {  
   
                 /*  
                  * The frame quantizer has not been clipped, this appear to be a good  
                  * computed quantizer, however past frames give us some info about how  
                  * this quantizer performs against the algo prevision. Let's use this  
                  * prevision to increase the quantizer when we observe a too big  
                  * accumulated error  
                  */  
                 if (s->type == XVID_TYPE_BVOP) {  
                         rc->bquant_error[data->quant] += ((double)(s->quant * s->length) / desired) - data->quant;  
   
                         if (rc->bquant_error[data->quant] >= 1.0) {  
                                 rc->bquant_error[data->quant] -= 1.0;  
                                 data->quant++;  
                         }  
656                  } else {                  } else {
                         rc->pquant_error[data->quant] += ((double)(s->quant * s->length) / desired) - data->quant;  
657    
658                          if (rc->pquant_error[data->quant] >= 1.0) {                  /* The frame quantizer has not been clipped, this appears to be a good
659                                  rc->pquant_error[data->quant] -= 1.0;                   * computed quantizer, do not loose quantizer decimal part that we
660                     * accumulate for later reuse when its sum represents a complete
661                     * unit. */
662                    rc->quant_error[s->type-1][data->quant] += scaled_quant - (double)data->quant;
663    
664                    if (rc->quant_error[s->type-1][data->quant] >= 1.0) {
665                            rc->quant_error[s->type-1][data->quant] -= 1.0;
666                                  data->quant++;                                  data->quant++;
667                          }                  } else if (rc->quant_error[s->type-1][data->quant] <= -1.0) {
668                            rc->quant_error[s->type-1][data->quant] += 1.0;
669                            data->quant--;
670                  }                  }
671          }          }
672    
673          /*          /* 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  
674           * possible +1 correction due to cumulated error. We can now safely clip           * possible +1 correction due to cumulated error. We can now safely clip
675           * the quantizer again with user's quant ranges. "Safely" means the Rate           * the quantizer again with user's quant ranges. "Safely" means the Rate
676           * Control could learn more about this quantizer, this knowledge is useful           * Control could learn more about this quantizer, this knowledge is useful
677           * 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,
678           * that's why we don't perform this clipping earlier.           * that's why we don't perform this clipping earlier. */
          */  
679          if (data->quant < data->min_quant[s->type-1]) {          if (data->quant < data->min_quant[s->type-1]) {
680                  data->quant = data->min_quant[s->type-1];                  data->quant = data->min_quant[s->type-1];
681          } else if (data->quant > data->max_quant[s->type-1]) {          } else if (data->quant > data->max_quant[s->type-1]) {
682                  data->quant = data->max_quant[s->type-1];                  data->quant = data->max_quant[s->type-1];
683          }          }
684    
685          /*          /* To avoid big quality jumps from frame to frame, we apply a "security"
          * To avoid big quality jumps from frame to frame, we apply a "security"  
686           * rule that makes |last_quant - new_quant| <= 2. This rule only applies           * rule that makes |last_quant - new_quant| <= 2. This rule only applies
687           * to predicted frames (P and B)           * to predicted frames (P and B) */
          */  
688          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) {
689    
690                  if (data->quant > rc->last_quant[s->type-1] + 2) {                  if (data->quant > rc->last_quant[s->type-1] + 2) {
691                          data->quant = rc->last_quant[s->type-1] + 2;                          data->quant = rc->last_quant[s->type-1] + 2;
692                          DPRINTF(XVID_DEBUG_RC,                          DPRINTF(XVID_DEBUG_RC,
693                                          "[%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",
694                                          data->frame_num);                                          data->frame_num);
695                  }                  }
696                  if (data->quant < rc->last_quant[s->type-1] - 2) {                  if (data->quant < rc->last_quant[s->type-1] - 2) {
697                          data->quant = rc->last_quant[s->type-1] - 2;                          data->quant = rc->last_quant[s->type-1] - 2;
698                          DPRINTF(XVID_DEBUG_RC,                          DPRINTF(XVID_DEBUG_RC,
699                                          "[%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",
700                                          data->frame_num);                                          data->frame_num);
701                  }                  }
702          }          }
703    
704          /*          /* We don't want to pollute the RC histerisis when our computed quant has
705           * 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  
          */  
706          if (capped_to_max_framesize == 0)          if (capped_to_max_framesize == 0)
707                  rc->last_quant[s->type-1] = data->quant;                  rc->last_quant[s->type-1] = data->quant;
708    
709            /* Don't forget to force 1st pass frame type ;-) */
710            data->type = s->type;
711    
712            /* Store the quantizer into the statistics -- Used to compensate the double
713             * formula symptom */
714            s->quant2 = data->quant;
715    
716          return 0;          return 0;
717  }  }
718    
# Line 594  Line 723 
723  rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)  rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)
724  {  {
725          const char frame_type[4] = { 'i', 'p', 'b', 's'};          const char frame_type[4] = { 'i', 'p', 'b', 's'};
726          stat_t * s = &rc->stats[data->frame_num];          twopass_stat_t * s = &rc->stats[data->frame_num];
727    
728          /* Insufficent stats data */          /* Insufficent stats data */
729      if (data->frame_num >= rc->num_frames)      if (data->frame_num >= rc->num_frames)
730          return 0;          return 0;
731    
732      rc->quant_count[data->quant]++;          /* Update the quantizer counter */
733            rc->quant_count[s->type-1][data->quant]++;
734    
735            /* Update the frame type overflow */
736      if (data->type == XVID_TYPE_IVOP) {      if (data->type == XVID_TYPE_IVOP) {
737          int kfdiff = (rc->keyframe_locations[rc->KF_idx] -      rc->keyframe_locations[rc->KF_idx - 1]);                  int kfdiff = 0;
738    
739                    if(rc->KF_idx != rc->num_frames -1) {
740                            kfdiff  = rc->keyframe_locations[rc->KF_idx+1];
741                            kfdiff -= rc->keyframe_locations[rc->KF_idx];
742                    }
743    
744                    /* Flush Keyframe overflow accumulator */
745          rc->overflow += rc->KFoverflow;          rc->overflow += rc->KFoverflow;
746    
747                    /* Store the frame overflow to the keyframe accumulator */
748          rc->KFoverflow = s->desired_length - data->length;          rc->KFoverflow = s->desired_length - data->length;
749    
750          if (kfdiff > 1) {  // non-consecutive keyframes                  if (kfdiff > 1) {
751                            /* Non-consecutive keyframes case:
752                             * We can then divide this total keyframe overflow into equal parts
753                             * that we will distribute into regular overflow at each frame
754                             * between the sequence bounded by two IFrames */
755              rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);              rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);
756          }else{ // consecutive keyframes                  } else {
757                            /* Consecutive keyframes case:
758                             * Flush immediatly the keyframe overflow and reset keyframe
759                             * overflow */
760                          rc->overflow += rc->KFoverflow;                          rc->overflow += rc->KFoverflow;
761                          rc->KFoverflow = 0;                          rc->KFoverflow = 0;
762                          rc->KFoverflow_partial = 0;                          rc->KFoverflow_partial = 0;
763          }          }
764          rc->KF_idx++;          rc->KF_idx++;
765      } else {      } else {
766          // distribute part of the keyframe overflow                  /* Accumulate the frame overflow */
767          rc->overflow += s->desired_length - data->length + rc->KFoverflow_partial;                  rc->overflow += s->desired_length - data->length;
768    
769                    /* Distribute part of the keyframe overflow */
770                    rc->overflow += rc->KFoverflow_partial;
771    
772                    /* Don't forget to substract that same amount from the total keyframe
773                     * overflow */
774          rc->KFoverflow -= rc->KFoverflow_partial;          rc->KFoverflow -= rc->KFoverflow_partial;
775      }      }
776    
777          DPRINTF(XVID_DEBUG_RC, "[%i] type:%c quant:%i stats1:%i scaled:%i actual:%i overflow:%i\n",          rc->overflow += s->error = s->desired_length - data->length;
778            rc->real_total += data->length;
779    
780            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",
781                          data->frame_num,                          data->frame_num,
782                          frame_type[data->type-1],                          frame_type[data->type-1],
783                          data->quant,                          data->quant,
784                          s->length,                          s->length,
785                          s->scaled_length,                          s->scaled_length,
786                          data->length,                          s->desired_length,
787                            s->desired_length - s->error,
788                            -s->error,
789                          rc->overflow);                          rc->overflow);
790    
791      return(0);      return(0);
# Line 638  Line 795 
795   * Helper functions definition   * Helper functions definition
796   ****************************************************************************/   ****************************************************************************/
797    
798    /* Default buffer size for reading lines */
799  #define BUF_SZ   1024  #define BUF_SZ   1024
 #define MAX_COLS 5  
800    
801  /* open stats file, and count num frames */  /* Helper functions for reading/parsing the stats file */
802    static char *skipspaces(char *string);
803    static int iscomment(char *string);
804    static char *readline(FILE *f);
805    
806    /* This function counts the number of frame entries in the stats file
807     * It also counts the number of I Frames */
808  static int  static int
809  det_stats_length(rc_2pass2_t * rc, char * filename)  statsfile_count_frames(rc_2pass2_t * rc, char * filename)
810  {  {
811      FILE * f;      FILE * f;
812      int n, ignore;          char *line;
813      char type;          int lines;
814    
815      rc->num_frames = 0;      rc->num_frames = 0;
816      rc->num_keyframes = 0;      rc->num_keyframes = 0;
817    
818      if ((f = fopen(filename, "rt")) == NULL)          if ((f = fopen(filename, "rb")) == NULL)
819          return 0;                  return(-1);
820    
821      while((n = fscanf(f, "%c %d %d %d %d %d %d\n",          lines = 0;
822          &type, &ignore, &ignore, &ignore, &ignore, &ignore, &ignore)) != EOF) {          while ((line = readline(f)) != NULL) {
823          if (type == 'i') {  
824              rc->num_frames++;                  char *ptr;
825                    char type;
826                    int fields;
827    
828                    lines++;
829    
830                    /* We skip spaces */
831                    ptr = skipspaces(line);
832    
833                    /* Skip coment lines or empty lines */
834                    if(iscomment(ptr) || *ptr == '\0') {
835                            free(line);
836                            continue;
837                    }
838    
839                    /* Read the stat line from buffer */
840                    fields = sscanf(ptr, "%c", &type);
841    
842                    /* Valid stats files have at least 6 fields */
843                    if (fields == 1) {
844                            switch(type) {
845                            case 'i':
846                            case 'I':
847              rc->num_keyframes++;              rc->num_keyframes++;
848          }else if (type == 'p' || type == 'b' || type == 's') {                          case 'p':
849                            case 'P':
850                            case 'b':
851                            case 'B':
852                            case 's':
853                            case 'S':
854              rc->num_frames++;              rc->num_frames++;
855                                    break;
856                            default:
857                                    DPRINTF(XVID_DEBUG_RC,
858                                                    "[xvid rc] -- WARNING: L%d unknown frame type used (%c).\n",
859                                                    lines, type);
860          }          }
861                    } else {
862                                    DPRINTF(XVID_DEBUG_RC,
863                                                    "[xvid rc] -- WARNING: L%d misses some stat fields (%d).\n",
864                                                    lines, 6-fields);
865      }      }
866    
867                    /* Free the line buffer */
868                    free(line);
869            }
870    
871            /* We are done with the file */
872      fclose(f);      fclose(f);
873    
874      return 1;          return(0);
875  }  }
876    
877  /* open stats file(s) and read into rc->stats array */  /* open stats file(s) and read into rc->stats array */
   
878  static int  static int
879  load_stats(rc_2pass2_t *rc, char * filename)  statsfile_load(rc_2pass2_t *rc, char * filename)
880  {  {
881      FILE * f;      FILE * f;
882      int i, not_scaled;          int processed_entries;
   
883    
884      if ((f = fopen(filename, "rt"))==NULL)          /* Opens the file */
885          return 0;          if ((f = fopen(filename, "rb"))==NULL)
886                    return(-1);
887    
888      i = 0;          processed_entries = 0;
889          not_scaled = 0;          while(processed_entries < rc->num_frames) {
     while(i < rc->num_frames) {  
         stat_t * s = &rc->stats[i];  
         int n;  
890          char type;          char type;
891                    int fields;
892                    twopass_stat_t * s = &rc->stats[processed_entries];
893                    char *line, *ptr;
894    
895                    /* Read the line from the file */
896                    if((line = readline(f)) == NULL)
897                            break;
898    
899                    /* We skip spaces */
900                    ptr = skipspaces(line);
901    
902                    /* Skip comment lines or empty lines */
903                    if(iscomment(ptr) || *ptr == '\0') {
904                            free(line);
905                            continue;
906                    }
907    
908                    /* Reset this field that is optional */
909                  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;  
                 }  
910    
911          if (type == 'i') {                  /* Convert the fields */
912                    fields = sscanf(ptr,
913                                                    "%c %d %d %d %d %d %d\n",
914                                                    &type,
915                                                    &s->quant,
916                                                    &s->blks[0], &s->blks[1], &s->blks[2],
917                                                    &s->length,
918                                                    &s->scaled_length);
919    
920                    /* Free line buffer, we don't need it anymore */
921                    free(line);
922    
923                    /* Fail silently, this has probably been warned in
924                     * statsfile_count_frames */
925                    if(fields != 6 && fields != 7)
926                            continue;
927    
928                    /* Convert frame type */
929                    switch(type) {
930                    case 'i':
931                    case 'I':
932              s->type = XVID_TYPE_IVOP;              s->type = XVID_TYPE_IVOP;
933          }else if (type == 'p' || type == 's') {                          break;
934                    case 'p':
935                    case 'P':
936                    case 's':
937                    case 'S':
938              s->type = XVID_TYPE_PVOP;              s->type = XVID_TYPE_PVOP;
939          }else if (type == 'b') {                          break;
940                    case 'b':
941                    case 'B':
942              s->type = XVID_TYPE_BVOP;              s->type = XVID_TYPE_BVOP;
943          }else{  /* unknown type */                          break;
944              DPRINTF(XVID_DEBUG_RC, "unknown stats frame type; assuming pvop\n");                  default:
945              s->type = XVID_TYPE_PVOP;                          /* Same as before, fail silently */
946                            continue;
947          }          }
948    
949          i++;                  /* Ok it seems it's been processed correctly */
950                    processed_entries++;
951      }      }
952    
953      rc->num_frames = i;          /* Close the file */
   
954          fclose(f);          fclose(f);
955    
956      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);  
     }  
957  }  }
 #endif  
958    
959  /* pre-process the statistics data  /* pre-process the statistics data
960      - for each type, count, tot_length, min_length, max_length   * - for each type, count, tot_length, min_length, max_length
961      - set keyframes_locations   * - set keyframes_locations */
 */  
   
962  static void  static void
963  pre_process0(rc_2pass2_t * rc)  first_pass_stats_prepare_data(rc_2pass2_t * rc)
964  {  {
965      int i,j;      int i,j;
966    
967            /* *rc fields initialization
968             * NB: INT_MAX and INT_MIN are used in order to be immediately replaced
969             *     with real values of the 1pass */
970      for (i=0; i<3; i++) {      for (i=0; i<3; i++) {
971          rc->count[i]=0;          rc->count[i]=0;
972          rc->tot_length[i] = 0;          rc->tot_length[i] = 0;
         rc->last_quant[i] = 0;  
973                  rc->min_length[i] = INT_MAX;                  rc->min_length[i] = INT_MAX;
974      }      }
975    
976          rc->max_length = INT_MIN;          rc->max_length = INT_MIN;
977    
978            /* Loop through all frames and find/compute all the stuff this function
979             * is supposed to do */
980      for (i=j=0; i<rc->num_frames; i++) {      for (i=j=0; i<rc->num_frames; i++) {
981          stat_t * s = &rc->stats[i];                  twopass_stat_t * s = &rc->stats[i];
982    
983          rc->count[s->type-1]++;          rc->count[s->type-1]++;
984          rc->tot_length[s->type-1] += s->length;          rc->tot_length[s->type-1] += s->length;
# Line 768  Line 997 
997          }          }
998      }      }
999    
1000          /*          /* NB:
          * Nota Bene:  
1001           * The "per sequence" overflow system considers a natural sequence to be           * The "per sequence" overflow system considers a natural sequence to be
1002           * 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
1003           * 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
1004           * frame to appear in the keyframe locations array.           * frame to appear in the keyframe locations array. */
          */  
1005      rc->keyframe_locations[j] = i;      rc->keyframe_locations[j] = i;
1006    
1007          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]);
1008          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]);
1009          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]);
1010  }  }
1011    
1012  /* calculate zone weight "center" */  /* calculate zone weight "center" */
   
1013  static void  static void
1014  zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)  zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)
1015  {  {
# Line 825  Line 1051 
1051              next -= create->zones[i].frame;              next -= create->zones[i].frame;
1052              rc->avg_weight += (double)(next * create->zones[i].increment) / (double)create->zones[i].base;              rc->avg_weight += (double)(next * create->zones[i].increment) / (double)create->zones[i].base;
1053              n += next;              n += next;
1054          }else{  // XVID_ZONE_QUANT                  }else{  /* XVID_ZONE_QUANT */
1055              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++ ) {
1056                  rc->stats[j].zone_mode = XVID_ZONE_QUANT;                  rc->stats[j].zone_mode = XVID_ZONE_QUANT;
1057                  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;
# Line 835  Line 1061 
1061      }      }
1062      rc->avg_weight = n>0 ? rc->avg_weight/n : 1.0;      rc->avg_weight = n>0 ? rc->avg_weight/n : 1.0;
1063    
1064      DPRINTF(XVID_DEBUG_RC, "center_weight: %f (for %i frames);   fixed_bytes: %i\n", rc->avg_weight, n, rc->tot_quant);          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- center_weight:%f (for %d frames)  fixed_bytes:%d\n", rc->avg_weight, n, rc->tot_quant);
1065  }  }
1066    
1067    
1068  /* scale the curve */  /* scale the curve */
   
1069  static void  static void
1070  internal_scale(rc_2pass2_t *rc)  first_pass_scale_curve_internal(rc_2pass2_t *rc)
1071  {  {
1072          int64_t target  = rc->target - rc->tot_quant;          int64_t target;
1073          int64_t pass1_length = rc->tot_length[0] + rc->tot_length[1] + rc->tot_length[2] - rc->tot_quant;          int64_t pass1_length;
1074          double scaler;          double scaler;
1075          int i;          int i, num_MBs;
1076    
1077            /* We remove the bytes used by the fixed quantizer zones
1078             * ToDo: this approach is flawed, the same amount of bytes is removed from
1079             *       target and first pass data, this has no sense, zone_process should
1080             *       give us two results one for unscaled data (1pass) and the other
1081             *       one for scaled data and we should then write:
1082             *       target = rc->target - rc->tot_quant_scaled;
1083             *       pass1_length = rc->i+p+b - rc->tot_quant_firstpass */
1084            target = rc->target - rc->tot_quant;
1085    
1086            /* Do the same for the first pass data */
1087            pass1_length  = rc->tot_length[XVID_TYPE_IVOP-1];
1088            pass1_length += rc->tot_length[XVID_TYPE_PVOP-1];
1089            pass1_length += rc->tot_length[XVID_TYPE_BVOP-1];
1090            pass1_length -= rc->tot_quant;
1091    
1092          /* Let's compute a linear scaler in order to perform curve scaling */          /* Let's compute a linear scaler in order to perform curve scaling */
1093          scaler = (double)target / (double)pass1_length;          scaler = (double)target / (double)pass1_length;
1094    
1095          if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {          if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {
1096                  DPRINTF(XVID_DEBUG_RC, "WARNING: Undersize detected\n");                  DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- WARNING: Undersize detected before correction\n");
1097          scaler = 1.0;          scaler = 1.0;
1098          }          }
1099    
1100      DPRINTF(XVID_DEBUG_RC,          /* Compute min frame lengths (for each frame type) according to the number
1101                          "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
1102                          (int)target, (int)pass1_length, scaler);           * number of MBs.
1103             *
1104             * We compare these hardcoded values with observed values in first pass
1105             * (determined in pre_process0).Then we keep the real minimum. */
1106    
1107            /* Number of MBs */
1108            num_MBs  = rc->stats[0].blks[0];
1109            num_MBs += rc->stats[0].blks[1];
1110            num_MBs += rc->stats[0].blks[2];
1111    
1112            /* Minimum for I frames */
1113            if(rc->min_length[XVID_TYPE_IVOP-1] > ((num_MBs*22) + 240) / 8)
1114                    rc->min_length[XVID_TYPE_IVOP-1] = ((num_MBs*22) + 240) / 8;
1115    
1116            /* Minimum for P/S frames */
1117            if(rc->min_length[XVID_TYPE_PVOP-1] > ((num_MBs) + 88)  / 8)
1118                    rc->min_length[XVID_TYPE_PVOP-1] = ((num_MBs) + 88)  / 8;
1119    
1120            /* Minimum for B frames */
1121            if(rc->min_length[XVID_TYPE_BVOP-1] > 8)
1122                    rc->min_length[XVID_TYPE_BVOP-1] = 8;
1123    
1124          /*          /* Perform an initial scale pass.
1125           * Perform an initial scale pass.           *
1126           * If a frame size is scaled underneath our hardcoded minimums, then we           * If a frame size is scaled underneath our hardcoded minimums, then we
1127           * force the frame size to the minimum, and deduct the original & scaled           * force the frame size to the minimum, and deduct the original & scaled
1128           * frame length from the original and target total lengths           * frame length from the original and target total lengths */
          */  
   
1129          for (i=0; i<rc->num_frames; i++) {          for (i=0; i<rc->num_frames; i++) {
1130                  stat_t * s = &rc->stats[i];                  twopass_stat_t * s = &rc->stats[i];
                 int min_size[3];  
1131                  int len;                  int len;
1132    
1133                  /* Compute min frame lengths (oe for each frame type) */                  /* No need to scale frame length for which a specific quantizer is
1134                  min_size[0] = ((s->blks[0]*22) + 240) / 8;                   * specified thanks to zones */
                 min_size[1] = (s->blks[0] + 88) / 8;  
                 min_size[2] = 8;  
   
1135          if (s->zone_mode == XVID_ZONE_QUANT) {          if (s->zone_mode == XVID_ZONE_QUANT) {
1136              s->scaled_length = s->length;              s->scaled_length = s->length;
1137                          continue;                          continue;
1138                  }                  }
1139    
1140                  /* Compute teh scaled length */                  /* Compute the scaled length */
1141                  len = (int)((double)s->length * scaler * s->weight / rc->avg_weight);                  len = (int)((double)s->length * scaler * s->weight / rc->avg_weight);
1142    
1143                  /* Compare with the computed minimum */                  /* Compare with the computed minimum */
1144                  if (len < min_size[s->type-1]) {                  if (len < rc->min_length[s->type-1]) {
1145                          /* force frame size to our computed minimum */                          /* This is a 'forced size' frame, set its frame size to the
1146                          s->scaled_length = min_size[s->type-1];                           * computed minimum */
1147                            s->scaled_length = rc->min_length[s->type-1];
1148    
1149                            /* Remove both scaled and original size from their respective
1150                             * total counters, as we prepare a second pass for 'regular'
1151                             * frames */
1152                          target -= s->scaled_length;                          target -= s->scaled_length;
1153                          pass1_length -= s->length;                          pass1_length -= s->length;
1154                  } else {                  } else {
1155                          /* Do nothing for now, we'll scale this later */                          /* Do nothing for now, we'll scale this later */
1156                          s->scaled_length = 0;                          s->scaled_length = 0;
1157                  }                  }
   
1158          }          }
1159    
1160          /* Correct the scaler for all non forced frames */          /* The first pass on data substracted all 'forced size' frames from the
1161             * total counters. Now, it's possible to scale the 'regular' frames. */
1162    
1163            /* Scaling factor for 'regular' frames */
1164          scaler = (double)target / (double)pass1_length;          scaler = (double)target / (double)pass1_length;
1165    
1166          /* Detect undersizing */          /* Detect undersizing */
1167      if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {      if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {
1168                  DPRINTF(XVID_DEBUG_RC, "WARNING: Undersize detected\n");                  DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- WARNING: Undersize detected after correction\n");
1169                  scaler = 1.0;                  scaler = 1.0;
1170          }          }
1171    
         DPRINTF(XVID_DEBUG_RC,  
                         "After correction: target=%i, tot_length=%i, scaler=%f\n",  
                         (int)target, (int)pass1_length, scaler);  
   
1172          /* Do another pass with the new scaler */          /* Do another pass with the new scaler */
1173          for (i=0; i<rc->num_frames; i++) {          for (i=0; i<rc->num_frames; i++) {
1174                  stat_t * s = &rc->stats[i];                  twopass_stat_t * s = &rc->stats[i];
1175    
1176                  /* Ignore frame with forced frame sizes */                  /* Ignore frame with forced frame sizes */
1177                  if (s->scaled_length == 0)                  if (s->scaled_length == 0)
1178                          s->scaled_length = (int)((double)s->length * scaler * s->weight / rc->avg_weight);                          s->scaled_length = (int)((double)s->length * scaler * s->weight / rc->avg_weight);
1179          }          }
1180    
1181            /* Job done */
1182            return;
1183  }  }
1184    
1185    /* Apply all user settings to the scaled curve
1186     * This implies:
1187     *   keyframe boosting
1188     *   high/low compression */
1189  static void  static void
1190  pre_process1(rc_2pass2_t * rc)  scaled_curve_apply_advanced_parameters(rc_2pass2_t * rc)
1191  {  {
1192      int i;      int i;
     double total1, total2;  
1193      uint64_t ivop_boost_total;      uint64_t ivop_boost_total;
1194    
1195      ivop_boost_total = 0;          /* Reset the rate controller (per frame type) total byte counters */
1196      rc->curve_comp_error = 0;          for (i=0; i<3; i++) rc->tot_scaled_length[i] = 0;
1197    
1198      for (i=0; i<3; i++) {          /* Compute total bytes for each frame type */
1199          rc->tot_scaled_length[i] = 0;          for (i=0; i<rc->num_frames;i++) {
1200                    twopass_stat_t *s = &rc->stats[i];
1201                    rc->tot_scaled_length[s->type-1] += s->scaled_length;
1202      }      }
1203    
1204            /* First we compute the total amount of bits needed, as being described by
1205             * the scaled distribution. During this pass over the complete stats data,
1206             * we see how much bits two user settings will get/give from/to p&b frames:
1207             *  - keyframe boosting
1208             *  - keyframe distance penalty */
1209            rc->KF_idx = 0;
1210            ivop_boost_total = 0;
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];
   
         rc->tot_scaled_length[s->type-1] += s->scaled_length;  
1213    
1214                    /* Some more work is needed for I frames */
1215          if (s->type == XVID_TYPE_IVOP) {          if (s->type == XVID_TYPE_IVOP) {
1216              ivop_boost_total += s->scaled_length * rc->param.keyframe_boost / 100;                          int penalty_distance;
1217                            int ivop_boost;
1218    
1219                            /* Accumulate bytes needed for keyframe boosting */
1220                            ivop_boost = s->scaled_length*rc->param.keyframe_boost/100;
1221    
1222                            if (rc->KF_idx) {
1223                                    /* Minimum keyframe distance penalties */
1224                                    penalty_distance  = rc->param.min_key_interval;
1225                                    penalty_distance -= rc->keyframe_locations[rc->KF_idx];
1226                                    penalty_distance += rc->keyframe_locations[rc->KF_idx-1];
1227    
1228                                    /* Ah ah ! guilty keyframe, you're under arrest ! */
1229                                    if (penalty_distance > 0)
1230                                             ivop_boost -= (s->scaled_length + ivop_boost)*penalty_distance*rc->param.kfreduction/100;
1231                            }
1232    
1233                            /* If the frame size drops under the minimum length, then cap ivop_boost */
1234                            if (ivop_boost + s->scaled_length < rc->min_length[XVID_TYPE_IVOP-1])
1235                                    ivop_boost = rc->min_length[XVID_TYPE_IVOP-1] - s->scaled_length;
1236    
1237                            /* Accumulate the ivop boost */
1238                            ivop_boost_total += ivop_boost;
1239    
1240                            /* Don't forget to update the keyframe index */
1241                            rc->KF_idx++;
1242          }          }
1243      }      }
1244    
1245      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
1246                                          (rc->tot_scaled_length[XVID_TYPE_PVOP-1] + rc->tot_scaled_length[XVID_TYPE_BVOP-1]));           *
1247             * This ratio has to be applied to p/b/s frames in order to reserve
1248             * additional bits for keyframes (keyframe boosting) or if too much
1249             * keyframe distance is applied, bits retrieved from the keyframes.
1250             *
1251             * ie pb_length *= rc->pb_iboost_tax_ratio;
1252             *
1253             *    gives the ideal length of a p/b frame */
1254    
1255            /* Compute the total length of p/b/s frames (temporary storage into
1256             * movie_curve) */
1257            rc->pb_iboost_tax_ratio  = (double)rc->tot_scaled_length[XVID_TYPE_PVOP-1];
1258            rc->pb_iboost_tax_ratio += (double)rc->tot_scaled_length[XVID_TYPE_BVOP-1];
1259    
1260            /* Compute the ratio described above
1261             *     taxed_total = sum(0, n, tax*scaled_length)
1262             * <=> taxed_total = tax.sum(0, n, tax*scaled_length)
1263             * <=> tax = taxed_total / original_total */
1264            rc->pb_iboost_tax_ratio =
1265                    (rc->pb_iboost_tax_ratio - ivop_boost_total) /
1266                    rc->pb_iboost_tax_ratio;
1267    
1268            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- IFrame boost tax ratio:%.2f\n",
1269                            rc->pb_iboost_tax_ratio);
1270    
1271            /* Compute the average size of frames per frame type */
1272      for(i=0; i<3; i++) {      for(i=0; i<3; i++) {
1273          if (rc->count[i] == 0 || rc->movie_curve == 0) {                  /* Special case for missing type or weird case */
1274                    if (rc->count[i] == 0 || rc->pb_iboost_tax_ratio == 0) {
1275              rc->avg_length[i] = 1;              rc->avg_length[i] = 1;
1276          }else{          }else{
1277              rc->avg_length[i] = rc->tot_scaled_length[i] / rc->count[i] / rc->movie_curve;                          rc->avg_length[i] = rc->tot_scaled_length[i];
1278          }  
1279                            if (i == (XVID_TYPE_IVOP-1)) {
1280                                    /* I Frames total has to be added the boost total */
1281                                    rc->avg_length[i] += ivop_boost_total;
1282                            } else {
1283                                    /* P/B frames has to taxed */
1284                                    rc->avg_length[i] *= rc->pb_iboost_tax_ratio;
1285      }      }
1286    
1287      /* --- */                          /* Finally compute the average frame size */
1288                            rc->avg_length[i] /= (double)rc->count[i];
1289                    }
1290            }
1291    
1292      total1=total2=0;          /* Assymetric curve compression */
1293            if (rc->param.curve_compression_high || rc->param.curve_compression_low) {
1294                    double symetric_total;
1295                    double assymetric_delta_total;
1296    
1297                    /* Like I frame boosting, assymetric curve compression modifies the total
1298                     * amount of needed bits, we must compute the ratio so we can prescale
1299                     lengths */
1300                    symetric_total = 0;
1301                    assymetric_delta_total = 0;
1302      for (i=0; i<rc->num_frames; i++) {      for (i=0; i<rc->num_frames; i++) {
1303          stat_t * s = &rc->stats[i];                          double assymetric_delta;
1304                            double dbytes;
1305                            twopass_stat_t * s = &rc->stats[i];
1306    
1307          if (s->type != XVID_TYPE_IVOP) {                          /* I Frames are not concerned by assymetric scaling */
1308              double dbytes,dbytes2;                          if (s->type == XVID_TYPE_IVOP)
1309                                    continue;
1310    
1311              dbytes = s->scaled_length / rc->movie_curve;                          /* During the real run, we would have to apply the iboost tax */
1312              dbytes2 = 0; /* XXX: warning */                          dbytes = s->scaled_length * rc->pb_iboost_tax_ratio;
             total1 += dbytes;  
             if (s->type == XVID_TYPE_BVOP)  
                 dbytes *= rc->avg_length[XVID_TYPE_PVOP-1] / rc->avg_length[XVID_TYPE_BVOP-1];  
1313    
1314                          if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                          /* Update the symmetric curve compression total */
1315                                  dbytes2=((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_high / 100.0);                          symetric_total += dbytes;
1316    
1317                            /* Apply assymetric curve compression */
1318                            if (dbytes > rc->avg_length[s->type-1])
1319                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * (double)rc->param.curve_compression_high / 100.0f;
1320                            else
1321                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * (double)rc->param.curve_compression_low  / 100.0f;
1322    
1323                            /* Cap to the minimum frame size if needed */
1324                            if (dbytes + assymetric_delta < rc->min_length[s->type-1])
1325                                    assymetric_delta = rc->min_length[s->type-1] - dbytes;
1326    
1327                            /* Accumulate after assymetric curve compression */
1328                            assymetric_delta_total += assymetric_delta;
1329                    }
1330    
1331                    /* Compute the tax that all p/b frames have to pay in order to respect the
1332                     * bit distribution changes that the assymetric compression curve imposes
1333                     * We want assymetric_total = sum(0, n-1, tax.scaled_length)
1334                     *      ie assymetric_total = ratio.sum(0, n-1, scaled_length)
1335                     *         ratio = assymetric_total / symmetric_total */
1336                    rc->assymetric_tax_ratio = ((double)symetric_total - (double)assymetric_delta_total) / (double)symetric_total;
1337                          } else {                          } else {
1338                                  dbytes2 = ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_low / 100.0);                  rc->assymetric_tax_ratio = 1.0f;
1339                          }                          }
1340    
1341              if (s->type == XVID_TYPE_BVOP) {          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Assymetric tax ratio:%.2f\n", rc->assymetric_tax_ratio);
1342                              dbytes2 *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
1343                              if (dbytes2 < rc->min_length[XVID_TYPE_BVOP-1])          /* Last bits that need to be reset */
1344                                      dbytes2 = rc->min_length[XVID_TYPE_BVOP-1];          rc->overflow = 0;
1345              }else{          rc->KFoverflow = 0;
1346                              if (dbytes2 < rc->min_length[XVID_TYPE_PVOP-1])          rc->KFoverflow_partial = 0;
1347                                      dbytes2 = rc->min_length[XVID_TYPE_PVOP-1];          rc->KF_idx = 0;
1348            rc->desired_total = 0;
1349            rc->real_total = 0;
1350    
1351            /* Job done */
1352            return;
1353              }              }
1354              total2 += dbytes2;  
1355    /*****************************************************************************
1356     * Still more low level stuff (nothing to do with stats treatment)
1357     ****************************************************************************/
1358    
1359    /* This function returns an allocated string containing a complete line read
1360     * from the file starting at the current position */
1361    static char *
1362    readline(FILE *f)
1363    {
1364            char *buffer = NULL;
1365            int buffer_size = 0;
1366            int pos = 0;
1367    
1368            do {
1369                    int c;
1370    
1371                    /* Read a character from the stream */
1372                    c = fgetc(f);
1373    
1374                    /* Is that EOF or new line ? */
1375                    if(c == EOF || c == '\n')
1376                            break;
1377    
1378                    /* Do we have to update buffer ? */
1379                    if(pos >= buffer_size - 1) {
1380                            buffer_size += BUF_SZ;
1381                            buffer = (char*)realloc(buffer, buffer_size);
1382                            if (buffer == NULL)
1383                                    return(NULL);
1384          }          }
1385    
1386                    buffer[pos] = c;
1387                    pos++;
1388            } while(1);
1389    
1390            /* Read \n or EOF */
1391            if (buffer == NULL) {
1392                    /* EOF, so we reached the end of the file, return NULL */
1393                    if(feof(f))
1394                            return(NULL);
1395    
1396                    /* Just an empty line with just a newline, allocate a 1 byte buffer to
1397                     * store a zero length string */
1398                    buffer = (char*)malloc(1);
1399                    if(buffer == NULL)
1400                            return(NULL);
1401      }      }
1402    
1403      rc->curve_comp_scale = total1 / total2;          /* Zero terminated string */
1404            buffer[pos] = '\0';
1405    
1406          DPRINTF(XVID_DEBUG_RC, "middle frame size for asymmetric curve compression: %i\n",          return(buffer);
1407              (int)(rc->avg_length[XVID_TYPE_PVOP-1] * rc->curve_comp_scale));  }
1408    
1409      rc->overflow = 0;  /* This function returns a pointer to the first non space char in the given
1410      rc->KFoverflow = 0;   * string */
1411      rc->KFoverflow_partial = 0;  static char *
1412      rc->KF_idx = 1;  skipspaces(char *string)
1413    {
1414            const char spaces[] =
1415                    {
1416                            ' ','\t','\0'
1417                    };
1418            const char *spacechar = spaces;
1419    
1420            if (string == NULL) return(NULL);
1421    
1422            while (*string != '\0') {
1423                    /* Test against space chars */
1424                    while (*spacechar != '\0') {
1425                            if (*string == *spacechar) {
1426                                    string++;
1427                                    spacechar = spaces;
1428                                    break;
1429                            }
1430                            spacechar++;
1431                    }
1432    
1433                    /* No space char */
1434                    if (*spacechar == '\0') return(string);
1435            }
1436    
1437            return(string);
1438    }
1439    
1440    /* This function returns a boolean that tells if the string is only a
1441     * comment */
1442    static int
1443    iscomment(char *string)
1444    {
1445            const char comments[] =
1446                    {
1447                            '#',';', '%', '\0'
1448                    };
1449            const char *cmtchar = comments;
1450            int iscomment = 0;
1451    
1452            if (string == NULL) return(1);
1453    
1454            string = skipspaces(string);
1455    
1456            while(*cmtchar != '\0') {
1457                    if(*string == *cmtchar) {
1458                            iscomment = 1;
1459                            break;
1460                    }
1461                    cmtchar++;
1462            }
1463    
1464            return(iscomment);
1465  }  }
1466    
1467    #if 0
1468    static void
1469    stats_print(rc_2pass2_t * rc)
1470    {
1471            int i;
1472            const char frame_type[4] = { 'i', 'p', 'b', 's'};
1473    
1474            for (i=0; i<rc->num_frames; i++) {
1475                    twopass_stat_t *s = &rc->stats[i];
1476                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- frame:%d type:%c quant:%d stats:%d scaled:%d desired:%d actual:%d overflow(%c):%.2f\n",
1477                                    i, frame_type[s->type-1], -1, s->length, s->scaled_length,
1478                                    s->desired_length, -1, frame_type[s->type-1], -1.0f);
1479            }
1480    }
1481    #endif
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