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revision 1050, Thu May 29 13:53:17 2003 UTC revision 1202, Sun Nov 9 20:49:21 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 1.1.2.17 2003-05-29 13:53:17 edgomez Exp $   * $Id: plugin_2pass2.c,v 1.1.2.24 2003-11-09 20:49:21 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    
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 61  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            /* Index of the last keyframe used in the keyframe_location */
155            int KF_idx;
156    
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];          double quant_error[3][32];
169          int quant_count[32];  
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 155  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 178  Line 269 
269    
270      rc->param = *param;      rc->param = *param;
271    
272          /*          /* Initialize all defaults */
          * 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          /* Initialize some stuff to zero */          /* Initialize some stuff to zero */
         for(i=0; i<32; i++) rc->quant_count[i] = 0;  
   
288          for(i=0; i<3; i++) {          for(i=0; i<3; i++) {
289                  int j;                  int j;
290                  for (j=0; j<32; j++)                  for (j=0; j<32; j++) {
291                          rc->quant_error[i][j] = 0;                          rc->quant_error[i][j] = 0;
292                            rc->quant_count[i][j] = 0;
293                    }
294          }          }
295    
296          for (i=0; i<3; i++)          for (i=0; i<3; i++) rc->last_quant[i] = 0;
                 rc->last_quant[i] = 0;  
297    
298          rc->fq_error = 0;          rc->fq_error = 0;
299    
300          /* Count frames in the stats file */          /* Count frames (and intra frames) in the stats file, store the result into
301          if (!det_stats_length(rc, param->filename)) {           * the rc structure */
302                  DPRINTF(XVID_DEBUG_RC,"ERROR: fopen %s failed\n", param->filename);          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 */
          * PS: see comment in pre_process0 for the +1 location requirement  
          */  
316          rc->keyframe_locations = malloc((rc->num_keyframes + 1) * sizeof(int));          rc->keyframe_locations = malloc((rc->num_keyframes + 1) * sizeof(int));
317          if (rc->keyframe_locations == NULL) {          if (rc->keyframe_locations == 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,"ERROR: 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);
# Line 244  Line 330 
330          }          }
331    
332          /* Compute the target filesize */          /* Compute the target filesize */
333          if (rc->num_frames  < create->fbase/create->fincr) {          if (rc->param.bitrate<0) {
334                    /* if negative, bitrate equals the target (in kbytes) */
335                    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 */                  /* Source sequence is less than 1s long, we do as if it was 1s long */
338                  rc->target = rc->param.bitrate / 8;                  rc->target = rc->param.bitrate / 8;
339          } else {          } else {
# Line 255  Line 344 
344                          ((uint64_t)create->fbase * 8);                          ((uint64_t)create->fbase * 8);
345          }          }
346    
347          DPRINTF(XVID_DEBUG_RC, "Frame rate: %d/%d (%ffps)\n",          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Frame rate: %d/%d (%ffps)\n",
348                          create->fbase, create->fincr,                          create->fbase, create->fincr,
349                          (double)create->fbase/(double)create->fincr);                          (double)create->fbase/(double)create->fincr);
350          DPRINTF(XVID_DEBUG_RC, "Number of frames: %d\n", rc->num_frames);          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Number of frames: %d\n", rc->num_frames);
351          DPRINTF(XVID_DEBUG_RC, "Target bitrate: %ld\n", rc->param.bitrate);          if(rc->param.bitrate>=0)
352          DPRINTF(XVID_DEBUG_RC, "Target filesize: %lld\n", rc->target);                  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 average 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    
361          /*          /* Gathers some information about first pass stats:
          * First data pre processing:  
362           *  - finds the minimum frame length for each frame type during 1st pass.           *  - finds the minimum frame length for each frame type during 1st pass.
363           *     rc->min_size[]           *     rc->min_size[]
364           *  - determines the maximum frame length observed (no frame type distinction).           *  - determines the maximum frame length observed (no frame type distinction).
# Line 280  Line 370 
370           *  - store keyframe location           *  - store keyframe location
371           *     rc->keyframe_locations[]           *     rc->keyframe_locations[]
372           */           */
373          pre_process0(rc);          first_pass_stats_prepare_data(rc);
374    
375          /*          /* When bitrate is not given it means it has been scaled by an external
376           * When bitrate is not given it means it has been scaled by an external           * application */
          * application  
          */  
377          if (rc->param.bitrate) {          if (rc->param.bitrate) {
378                  /* Apply zone settings */                  /* Apply zone settings */
379                  zone_process(rc, create);                  zone_process(rc, create);
380                  /* Perform curve scaling */                  /* Perform internal curve scaling */
381                  internal_scale(rc);                  first_pass_scale_curve_internal(rc);
382          } else {          } else {
383                  /* External scaling -- zones are ignored */                  /* External scaling -- zones are ignored */
384                  for (i=0;i<rc->num_frames;i++) {                  for (i=0;i<rc->num_frames;i++) {
# Line 301  Line 389 
389                  rc->tot_quant = 0;                  rc->tot_quant = 0;
390          }          }
391    
392          pre_process1(rc);          /* Apply advanced curve options, and compute some parameters in order to
393             * shape the curve in the BEFORE/AFTER pair of functions */
394            scaled_curve_apply_advanced_parameters(rc);
395    
396          *handle = rc;          *handle = rc;
397          return(0);          return(0);
# Line 313  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 325  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;
         double curve_temp;  
427          double scaled_quant;          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 355  Line 448 
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          /* XXX: warning */          /*------------------------------------------------------------------------
519          curve_temp = 0;           * Frame bit allocation: overflow control part.
520             *
521             * 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          if ((rc->param.curve_compression_high + rc->param.curve_compression_low) &&     s->type != XVID_TYPE_IVOP) {          /* Compute the overflow we should compensate */
527            if (s->type != XVID_TYPE_IVOP) {
528                    double frametype_factor;
529                    double framesize_factor;
530    
531                  curve_temp = rc->curve_comp_scale;                  /* Take only the desired part of overflow */
532                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                  overflow = rc->overflow;
                         curve_temp *= ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_high / 100.0);  
                 } else {  
                         curve_temp *= ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_low / 100.0);  
                 }  
533    
534                  /*                  /* Factor that will take care to decrease the overflow applied
535                   * End of code path for curve_temp, as told earlier, we are now                   * according to the importance of this frame type in term of
536                   * obliged to scale the value to a bframe one using the inverse                   * overall size */
537                   * ratio applied earlier                  frametype_factor  = rc->count[XVID_TYPE_IVOP-1]*rc->avg_length[XVID_TYPE_IVOP-1];
538                   */                  frametype_factor += rc->count[XVID_TYPE_PVOP-1]*rc->avg_length[XVID_TYPE_PVOP-1];
539                  if (s->type == XVID_TYPE_BVOP)                  frametype_factor += rc->count[XVID_TYPE_BVOP-1]*rc->avg_length[XVID_TYPE_BVOP-1];
540                          curve_temp *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];                  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                  desired += (int)curve_temp;                  /* Treat only the overflow part concerned by this frame type and size */
549                  rc->curve_comp_error += curve_temp - (int)curve_temp;                  overflow *= frametype_factor;
550          } else {  #if 0
551                  /*                  /* Leave this one alone, as it impacts badly on quality */
552                   * End of code path for dbytes, as told earlier, we are now                  overflow *= framesize_factor;
553                   * obliged to scale the value to a bframe one using the inverse  #endif
                  * ratio applied earlier  
                  */  
                 if (s->type == XVID_TYPE_BVOP)  
                         dbytes *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
554    
555                  desired += (int)dbytes;                  /* Apply the overflow strength imposed by the user */
556                  rc->curve_comp_error += dbytes - (int)dbytes;                  overflow *= (rc->param.overflow_control_strength/100.0f);
557            } else {
558                    /* no overflow applied in IFrames because:
559                     *  - their role is important as they're references for P/BFrames.
560                     *  - there aren't much in typical sequences, so if an IFrame overflows too
561                     *    much, this overflow may impact the next IFrame too much and generate
562                     *    a sequence of poor quality frames */
563                    overflow = 0;
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;  
                         }  
                         desired = rc->min_length[s->type-1];  
581                  }                  }
         }  
   
         s->desired_length = desired;  
   
   
         /*  
          * if this keyframe is too close to the next, reduce it's byte allotment  
          * XXX: why do we do this after setting the desired length ?  
          */  
   
         if (s->type == XVID_TYPE_IVOP) {  
                 int KFdistance = rc->keyframe_locations[rc->KF_idx] - rc->keyframe_locations[rc->KF_idx - 1];  
582    
583                  if (KFdistance < rc->param.kftreshold) {          /*-------------------------------------------------------------------------
584             * Frame bit allocation last part:
585             *
586             * Cap frame length so we don't reach neither bigger frame sizes than first
587             * pass nor smaller than the allowed minimum.
588             *-----------------------------------------------------------------------*/
589    
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            scaled_quant = (double)s->quant*(double)s->length/(double)dbytes;
627    
628          /* Reign in overflow with huge frames */  #ifdef COMPENSATE_FORMULA
629          if (labs(overflow) > labs(rc->overflow))          /* We know xvidcore will apply the bframe formula again, so we compensate
630                  overflow = rc->overflow;           * it right now to make sure we would not apply it twice */
631            if(s->type == XVID_TYPE_BVOP) {
         /* Make sure overflow doesn't run away */  
         if (overflow > desired * rc->param.max_overflow_improvement / 100) {  
                 desired += (overflow <= desired) ? desired * rc->param.max_overflow_improvement / 100 :  
                         overflow * rc->param.max_overflow_improvement / 100;  
         } else if (overflow < desired * rc->param.max_overflow_degradation / -100){  
                 desired += desired * rc->param.max_overflow_degradation / -100;  
         } else {  
                 desired += overflow;  
         }  
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 */
          * proves to be acurate enough for our algorithm  
          */  
         scaled_quant = (double)s->quant*(double)s->length/(double)desired;  
   
         /*  
          * Quantizer has been scaled using floating point operations/results, we  
          * must cast it to integer  
          */  
649          data->quant = (int)scaled_quant;          data->quant = (int)scaled_quant;
650    
651          /* Let's clip the computed quantizer, if needed */          /* Let's clip the computed quantizer, if needed */
# Line 539  Line 653 
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;
656          } else if (s->type != XVID_TYPE_IVOP) {          } else {
657    
658                  /*                  /* The frame quantizer has not been clipped, this appears to be a good
                  * The frame quantizer has not been clipped, this appears to be a good  
659                   * computed quantizer, do not loose quantizer decimal part that we                   * computed quantizer, do not loose quantizer decimal part that we
660                   * accumulate for later reuse when its sum represents a complete unit.                   * 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;                  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) {                  if (rc->quant_error[s->type-1][data->quant] >= 1.0) {
# Line 555  Line 668 
668                          rc->quant_error[s->type-1][data->quant] += 1.0;                          rc->quant_error[s->type-1][data->quant] += 1.0;
669                          data->quant--;                          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          /* Force frame type */          /* Don't forget to force 1st pass frame type ;-) */
710          data->type = s->type;          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 613  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 desired:%d 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,
                         data->length,  
786                          s->desired_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 658  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, nouse;
827    
828                    lines++;
829    
830                    /* We skip spaces */
831                    ptr = skipspaces(line);
832    
833                    /* Skip coment lines */
834                    if(iscomment(ptr)) {
835                            free(line);
836                            continue;
837                    }
838    
839                    /* Read the stat line from buffer */
840                    fields = sscanf(ptr,
841                                                    "%c %d %d %d %d %d",
842                                                    &type, &nouse, &nouse, &nouse, &nouse, &nouse);
843    
844                    /* Valid stats files have at least 6 fields */
845                    if (fields == 6) {
846                            switch(type) {
847                            case 'i':
848                            case 'I':
849              rc->num_keyframes++;              rc->num_keyframes++;
850          }else if (type == 'p' || type == 'b' || type == 's') {                          case 'p':
851                            case 'P':
852                            case 'b':
853                            case 'B':
854                            case 's':
855                            case 'S':
856              rc->num_frames++;              rc->num_frames++;
857                                    break;
858                            default:
859                                    DPRINTF(XVID_DEBUG_RC,
860                                                    "[xvid rc] -- WARNING: L%d unknown frame type used (%c).\n",
861                                                    lines, type);
862          }          }
863                    } else {
864                                    DPRINTF(XVID_DEBUG_RC,
865                                                    "[xvid rc] -- WARNING: L%d misses some stat fields (%d).\n",
866                                                    lines, 6-fields);
867      }      }
868    
869                    /* Free the line buffer */
870                    free(line);
871            }
872    
873            /* We are done with the file */
874      fclose(f);      fclose(f);
875    
876      return 1;          return(0);
877  }  }
878    
879  /* open stats file(s) and read into rc->stats array */  /* open stats file(s) and read into rc->stats array */
   
880  static int  static int
881  load_stats(rc_2pass2_t *rc, char * filename)  statsfile_load(rc_2pass2_t *rc, char * filename)
882  {  {
883      FILE * f;      FILE * f;
884      int i, not_scaled;          int processed_entries;
   
885    
886      if ((f = fopen(filename, "rt"))==NULL)          /* Opens the file */
887          return 0;          if ((f = fopen(filename, "rb"))==NULL)
888                    return(-1);
889    
890      i = 0;          processed_entries = 0;
891          not_scaled = 0;          while(processed_entries < rc->num_frames) {
     while(i < rc->num_frames) {  
         stat_t * s = &rc->stats[i];  
         int n;  
892          char type;          char type;
893                    int fields;
894                    twopass_stat_t * s = &rc->stats[processed_entries];
895                    char *line, *ptr;
896    
897                    /* Read the line from the file */
898                    if((line = readline(f)) == NULL)
899                            break;
900    
901                    /* We skip spaces */
902                    ptr = skipspaces(line);
903    
904                    /* Skip comment lines */
905                    if(iscomment(ptr)) {
906                            free(line);
907                            continue;
908                    }
909    
910                    /* Reset this field that is optional */
911                  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;  
                 }  
912    
913          if (type == 'i') {                  /* Convert the fields */
914                    fields = sscanf(ptr,
915                                                    "%c %d %d %d %d %d %d\n",
916                                                    &type,
917                                                    &s->quant,
918                                                    &s->blks[0], &s->blks[1], &s->blks[2],
919                                                    &s->length,
920                                                    &s->scaled_length);
921    
922                    /* Free line buffer, we don't need it anymore */
923                    free(line);
924    
925                    /* Fail silently, this has probably been warned in
926                     * statsfile_count_frames */
927                    if(fields != 6 && fields != 7)
928                            continue;
929    
930                    /* Convert frame type */
931                    switch(type) {
932                    case 'i':
933                    case 'I':
934              s->type = XVID_TYPE_IVOP;              s->type = XVID_TYPE_IVOP;
935          }else if (type == 'p' || type == 's') {                          break;
936                    case 'p':
937                    case 'P':
938                    case 's':
939                    case 'S':
940              s->type = XVID_TYPE_PVOP;              s->type = XVID_TYPE_PVOP;
941          }else if (type == 'b') {                          break;
942                    case 'b':
943                    case 'B':
944              s->type = XVID_TYPE_BVOP;              s->type = XVID_TYPE_BVOP;
945          }else{  /* unknown type */                          break;
946              DPRINTF(XVID_DEBUG_RC, "unknown stats frame type; assuming pvop\n");                  default:
947              s->type = XVID_TYPE_PVOP;                          /* Same as before, fail silently */
948                            continue;
949          }          }
950    
951          i++;                  /* Ok it seems it's been processed correctly */
952                    processed_entries++;
953      }      }
954    
955      rc->num_frames = i;          /* Close the file */
   
956          fclose(f);          fclose(f);
957    
958      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);  
     }  
959  }  }
 #endif  
960    
961  /* pre-process the statistics data  /* pre-process the statistics data
962      - for each type, count, tot_length, min_length, max_length   * - for each type, count, tot_length, min_length, max_length
963      - set keyframes_locations   * - set keyframes_locations */
 */  
   
964  static void  static void
965  pre_process0(rc_2pass2_t * rc)  first_pass_stats_prepare_data(rc_2pass2_t * rc)
966  {  {
967      int i,j;      int i,j;
968    
969          /*          /* *rc fields initialization
          * *rc fields initialization  
970           * NB: INT_MAX and INT_MIN are used in order to be immediately replaced           * NB: INT_MAX and INT_MIN are used in order to be immediately replaced
971           *     with real values of the 1pass           *     with real values of the 1pass */
          */  
972           for (i=0; i<3; i++) {           for (i=0; i<3; i++) {
973                  rc->count[i]=0;                  rc->count[i]=0;
974                  rc->tot_length[i] = 0;                  rc->tot_length[i] = 0;
# Line 772  Line 977 
977    
978          rc->max_length = INT_MIN;          rc->max_length = INT_MIN;
979    
980          /*          /* Loop through all frames and find/compute all the stuff this function
981           * Loop through all frames and find/compute all the stuff this function           * is supposed to do */
          * is supposed to do  
          */  
982          for (i=j=0; i<rc->num_frames; i++) {          for (i=j=0; i<rc->num_frames; i++) {
983                  stat_t * s = &rc->stats[i];                  twopass_stat_t * s = &rc->stats[i];
984    
985                  rc->count[s->type-1]++;                  rc->count[s->type-1]++;
986                  rc->tot_length[s->type-1] += s->length;                  rc->tot_length[s->type-1] += s->length;
# Line 796  Line 999 
999                  }                  }
1000          }          }
1001    
1002          /*          /* NB:
          * Nota Bene:  
1003           * The "per sequence" overflow system considers a natural sequence to be           * The "per sequence" overflow system considers a natural sequence to be
1004           * 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
1005           * 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
1006           * frame to appear in the keyframe locations array.           * frame to appear in the keyframe locations array. */
          */  
1007      rc->keyframe_locations[j] = i;      rc->keyframe_locations[j] = i;
1008    
1009          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]);
1010          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]);
1011          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]);
1012  }  }
1013    
1014  /* calculate zone weight "center" */  /* calculate zone weight "center" */
   
1015  static void  static void
1016  zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)  zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)
1017  {  {
# Line 853  Line 1053 
1053              next -= create->zones[i].frame;              next -= create->zones[i].frame;
1054              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;
1055              n += next;              n += next;
1056          }else{  // XVID_ZONE_QUANT                  }else{  /* XVID_ZONE_QUANT */
1057              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++ ) {
1058                  rc->stats[j].zone_mode = XVID_ZONE_QUANT;                  rc->stats[j].zone_mode = XVID_ZONE_QUANT;
1059                  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 863  Line 1063 
1063      }      }
1064      rc->avg_weight = n>0 ? rc->avg_weight/n : 1.0;      rc->avg_weight = n>0 ? rc->avg_weight/n : 1.0;
1065    
1066      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);
1067  }  }
1068    
1069    
1070  /* scale the curve */  /* scale the curve */
   
1071  static void  static void
1072  internal_scale(rc_2pass2_t *rc)  first_pass_scale_curve_internal(rc_2pass2_t *rc)
1073  {  {
1074          int64_t target  = rc->target - rc->tot_quant;          int64_t target;
1075          int64_t pass1_length = rc->tot_length[0] + rc->tot_length[1] + rc->tot_length[2] - rc->tot_quant;          int64_t pass1_length;
1076          double scaler;          double scaler;
1077          int i, num_MBs;          int i, num_MBs;
1078    
1079            /* We remove the bytes used by the fixed quantizer zones
1080             * ToDo: this approach is flawed, the same amount of bytes is removed from
1081             *       target and first pass data, this has no sense, zone_process should
1082             *       give us two results one for unscaled data (1pass) and the other
1083             *       one for scaled data and we should then write:
1084             *       target = rc->target - rc->tot_quant_scaled;
1085             *       pass1_length = rc->i+p+b - rc->tot_quant_firstpass */
1086            target = rc->target - rc->tot_quant;
1087    
1088            /* Do the same for the first pass data */
1089            pass1_length  = rc->tot_length[XVID_TYPE_IVOP-1];
1090            pass1_length += rc->tot_length[XVID_TYPE_PVOP-1];
1091            pass1_length += rc->tot_length[XVID_TYPE_BVOP-1];
1092            pass1_length -= rc->tot_quant;
1093    
1094          /* Let's compute a linear scaler in order to perform curve scaling */          /* Let's compute a linear scaler in order to perform curve scaling */
1095          scaler = (double)target / (double)pass1_length;          scaler = (double)target / (double)pass1_length;
1096    
1097          if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {          if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {
1098                  DPRINTF(XVID_DEBUG_RC, "WARNING: Undersize detected\n");                  DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- WARNING: Undersize detected before correction\n");
1099          scaler = 1.0;          scaler = 1.0;
1100          }          }
1101    
1102      DPRINTF(XVID_DEBUG_RC,          /* Compute min frame lengths (for each frame type) according to the number
1103                          "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
1104                          (int)target, (int)pass1_length, scaler);           * number of MBs.
   
         /*  
          * Compute min frame lengths (for each frame type) according to the number  
          * of MBs. We sum all blocks count from frame 0 (should be an IFrame, so  
          * blocks[0] should be enough) to know how many MBs there are.  
1105           *           *
1106           * We compare these hardcoded values with observed values in first pass           * We compare these hardcoded values with observed values in first pass
1107           * (determined in pre_process0).Then we keep the real minimum.           * (determined in pre_process0).Then we keep the real minimum. */
          */  
         num_MBs = rc->stats[0].blks[0] + rc->stats[0].blks[1] + rc->stats[0].blks[2];  
   
         if(rc->min_length[0] > ((num_MBs*22) + 240) / 8)  
                 rc->min_length[0] = ((num_MBs*22) + 240) / 8;  
1108    
1109          if(rc->min_length[1] > ((num_MBs) + 88)  / 8)          /* Number of MBs */
1110                  rc->min_length[1] = ((num_MBs) + 88)  / 8;          num_MBs  = rc->stats[0].blks[0];
1111            num_MBs += rc->stats[0].blks[1];
1112            num_MBs += rc->stats[0].blks[2];
1113    
1114            /* Minimum for I frames */
1115            if(rc->min_length[XVID_TYPE_IVOP-1] > ((num_MBs*22) + 240) / 8)
1116                    rc->min_length[XVID_TYPE_IVOP-1] = ((num_MBs*22) + 240) / 8;
1117    
1118            /* Minimum for P/S frames */
1119            if(rc->min_length[XVID_TYPE_PVOP-1] > ((num_MBs) + 88)  / 8)
1120                    rc->min_length[XVID_TYPE_PVOP-1] = ((num_MBs) + 88)  / 8;
1121    
1122            /* Minimum for B frames */
1123            if(rc->min_length[XVID_TYPE_BVOP-1] > 8)
1124                    rc->min_length[XVID_TYPE_BVOP-1] = 8;
1125    
1126          if(rc->min_length[2] > 8)          /* Perform an initial scale pass.
1127                  rc->min_length[2] = 8;           *
   
         /*  
          * Perform an initial scale pass.  
1128           * If a frame size is scaled underneath our hardcoded minimums, then we           * If a frame size is scaled underneath our hardcoded minimums, then we
1129           * force the frame size to the minimum, and deduct the original & scaled           * force the frame size to the minimum, and deduct the original & scaled
1130           * frame length from the original and target total lengths           * frame length from the original and target total lengths */
          */  
1131          for (i=0; i<rc->num_frames; i++) {          for (i=0; i<rc->num_frames; i++) {
1132                  stat_t * s = &rc->stats[i];                  twopass_stat_t * s = &rc->stats[i];
1133                  int len;                  int len;
1134    
1135                    /* No need to scale frame length for which a specific quantizer is
1136                     * specified thanks to zones */
1137          if (s->zone_mode == XVID_ZONE_QUANT) {          if (s->zone_mode == XVID_ZONE_QUANT) {
1138              s->scaled_length = s->length;              s->scaled_length = s->length;
1139                          continue;                          continue;
# Line 928  Line 1144 
1144    
1145                  /* Compare with the computed minimum */                  /* Compare with the computed minimum */
1146                  if (len < rc->min_length[s->type-1]) {                  if (len < rc->min_length[s->type-1]) {
1147                          /* force frame size to our computed minimum */                          /* This is a 'forced size' frame, set its frame size to the
1148                             * computed minimum */
1149                          s->scaled_length = rc->min_length[s->type-1];                          s->scaled_length = rc->min_length[s->type-1];
1150    
1151                            /* Remove both scaled and original size from their respective
1152                             * total counters, as we prepare a second pass for 'regular'
1153                             * frames */
1154                          target -= s->scaled_length;                          target -= s->scaled_length;
1155                          pass1_length -= s->length;                          pass1_length -= s->length;
1156                  } else {                  } else {
# Line 938  Line 1159 
1159                  }                  }
1160          }          }
1161    
1162          /* Correct the scaler for all non forced frames */          /* The first pass on data substracted all 'forced size' frames from the
1163             * total counters. Now, it's possible to scale the 'regular' frames. */
1164    
1165            /* Scaling factor for 'regular' frames */
1166          scaler = (double)target / (double)pass1_length;          scaler = (double)target / (double)pass1_length;
1167    
1168          /* Detect undersizing */          /* Detect undersizing */
1169      if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {      if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {
1170                  DPRINTF(XVID_DEBUG_RC, "WARNING: Undersize detected\n");                  DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- WARNING: Undersize detected after correction\n");
1171                  scaler = 1.0;                  scaler = 1.0;
1172          }          }
1173    
         DPRINTF(XVID_DEBUG_RC,  
                         "After correction: target=%i, tot_length=%i, scaler=%f\n",  
                         (int)target, (int)pass1_length, scaler);  
   
1174          /* Do another pass with the new scaler */          /* Do another pass with the new scaler */
1175          for (i=0; i<rc->num_frames; i++) {          for (i=0; i<rc->num_frames; i++) {
1176                  stat_t * s = &rc->stats[i];                  twopass_stat_t * s = &rc->stats[i];
1177    
1178                  /* Ignore frame with forced frame sizes */                  /* Ignore frame with forced frame sizes */
1179                  if (s->scaled_length == 0)                  if (s->scaled_length == 0)
1180                          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);
1181          }          }
1182    
1183            /* Job done */
1184            return;
1185  }  }
1186    
1187    /* Apply all user settings to the scaled curve
1188     * This implies:
1189     *   keyframe boosting
1190     *   high/low compression */
1191  static void  static void
1192  pre_process1(rc_2pass2_t * rc)  scaled_curve_apply_advanced_parameters(rc_2pass2_t * rc)
1193  {  {
1194      int i;      int i;
     double total1, total2;  
1195      uint64_t ivop_boost_total;      uint64_t ivop_boost_total;
1196    
1197      ivop_boost_total = 0;          /* Reset the rate controller (per frame type) total byte counters */
1198      rc->curve_comp_error = 0;          for (i=0; i<3; i++) rc->tot_scaled_length[i] = 0;
1199    
1200      for (i=0; i<3; i++) {          /* Compute total bytes for each frame type */
1201          rc->tot_scaled_length[i] = 0;          for (i=0; i<rc->num_frames;i++) {
1202                    twopass_stat_t *s = &rc->stats[i];
1203                    rc->tot_scaled_length[s->type-1] += s->scaled_length;
1204      }      }
1205    
1206            /* First we compute the total amount of bits needed, as being described by
1207             * the scaled distribution. During this pass over the complete stats data,
1208             * we see how much bits two user settings will get/give from/to p&b frames:
1209             *  - keyframe boosting
1210             *  - keyframe distance penalty */
1211            rc->KF_idx = 0;
1212            ivop_boost_total = 0;
1213      for (i=0; i<rc->num_frames; i++) {      for (i=0; i<rc->num_frames; i++) {
1214          stat_t * s = &rc->stats[i];                  twopass_stat_t * s = &rc->stats[i];
   
         rc->tot_scaled_length[s->type-1] += s->scaled_length;  
1215    
1216                    /* Some more work is needed for I frames */
1217          if (s->type == XVID_TYPE_IVOP) {          if (s->type == XVID_TYPE_IVOP) {
1218              ivop_boost_total += s->scaled_length * rc->param.keyframe_boost / 100;                          int penalty_distance;
1219                            int ivop_boost;
1220    
1221                            /* Accumulate bytes needed for keyframe boosting */
1222                            ivop_boost = s->scaled_length*rc->param.keyframe_boost/100;
1223    
1224                            if (rc->KF_idx) {
1225                                    /* Minimum keyframe distance penalties */
1226                                    penalty_distance  = rc->param.min_key_interval;
1227                                    penalty_distance -= rc->keyframe_locations[rc->KF_idx];
1228                                    penalty_distance += rc->keyframe_locations[rc->KF_idx-1];
1229    
1230                                    /* Ah ah ! guilty keyframe, you're under arrest ! */
1231                                    if (penalty_distance > 0)
1232                                             ivop_boost -= (s->scaled_length + ivop_boost)*penalty_distance*rc->param.kfreduction/100;
1233          }          }
1234    
1235                            /* If the frame size drops under the minimum length, then cap ivop_boost */
1236                            if (ivop_boost + s->scaled_length < rc->min_length[XVID_TYPE_IVOP-1])
1237                                    ivop_boost = rc->min_length[XVID_TYPE_IVOP-1] - s->scaled_length;
1238    
1239                            /* Accumulate the ivop boost */
1240                            ivop_boost_total += ivop_boost;
1241    
1242                            /* Don't forget to update the keyframe index */
1243                            rc->KF_idx++;
1244      }      }
1245            }
1246    
1247            /* Initialize the IBoost tax ratio for P/S/B frames
1248             *
1249             * This ratio has to be applied to p/b/s frames in order to reserve
1250             * additional bits for keyframes (keyframe boosting) or if too much
1251             * keyframe distance is applied, bits retrieved from the keyframes.
1252             *
1253             * ie pb_length *= rc->pb_iboost_tax_ratio;
1254             *
1255             *    gives the ideal length of a p/b frame */
1256    
1257      rc->movie_curve = ((double)(rc->tot_scaled_length[XVID_TYPE_PVOP-1] + rc->tot_scaled_length[XVID_TYPE_BVOP-1] + ivop_boost_total) /          /* Compute the total length of p/b/s frames (temporary storage into
1258                                          (rc->tot_scaled_length[XVID_TYPE_PVOP-1] + rc->tot_scaled_length[XVID_TYPE_BVOP-1]));           * movie_curve) */
1259            rc->pb_iboost_tax_ratio  = (double)rc->tot_scaled_length[XVID_TYPE_PVOP-1];
1260            rc->pb_iboost_tax_ratio += (double)rc->tot_scaled_length[XVID_TYPE_BVOP-1];
1261    
1262            /* Compute the ratio described above
1263             *     taxed_total = sum(0, n, tax*scaled_length)
1264             * <=> taxed_total = tax.sum(0, n, tax*scaled_length)
1265             * <=> tax = taxed_total / original_total */
1266            rc->pb_iboost_tax_ratio =
1267                    (rc->pb_iboost_tax_ratio - ivop_boost_total) /
1268                    rc->pb_iboost_tax_ratio;
1269    
1270            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- IFrame boost tax ratio:%.2f\n",
1271                            rc->pb_iboost_tax_ratio);
1272    
1273            /* Compute the average size of frames per frame type */
1274      for(i=0; i<3; i++) {      for(i=0; i<3; i++) {
1275          if (rc->count[i] == 0 || rc->movie_curve == 0) {                  /* Special case for missing type or weird case */
1276                    if (rc->count[i] == 0 || rc->pb_iboost_tax_ratio == 0) {
1277              rc->avg_length[i] = 1;              rc->avg_length[i] = 1;
1278          }else{          }else{
1279              rc->avg_length[i] = rc->tot_scaled_length[i] / rc->count[i] / rc->movie_curve;                          rc->avg_length[i] = rc->tot_scaled_length[i];
1280          }  
1281                            if (i == XVID_TYPE_IVOP) {
1282                                    /* I Frames total has to be added the boost total */
1283                                    rc->avg_length[i] += ivop_boost_total;
1284                            } else {
1285                                    /* P/B frames has to taxed */
1286                                    rc->avg_length[i] *= rc->pb_iboost_tax_ratio;
1287      }      }
1288    
1289      /* --- */                          /* Finally compute the average frame size */
1290                            rc->avg_length[i] /= (double)rc->count[i];
1291                    }
1292            }
1293    
1294      total1=total2=0;          /* Assymetric curve compression */
1295            if (rc->param.curve_compression_high || rc->param.curve_compression_low) {
1296                    double symetric_total;
1297                    double assymetric_delta_total;
1298    
1299                    /* Like I frame boosting, assymetric curve compression modifies the total
1300                     * amount of needed bits, we must compute the ratio so we can prescale
1301                     lengths */
1302                    symetric_total = 0;
1303                    assymetric_delta_total = 0;
1304      for (i=0; i<rc->num_frames; i++) {      for (i=0; i<rc->num_frames; i++) {
1305          stat_t * s = &rc->stats[i];                          double assymetric_delta;
1306                            double dbytes;
1307                            twopass_stat_t * s = &rc->stats[i];
1308    
1309          if (s->type != XVID_TYPE_IVOP) {                          /* I Frames are not concerned by assymetric scaling */
1310              double dbytes,dbytes2;                          if (s->type == XVID_TYPE_IVOP)
1311                                    continue;
1312    
1313                            /* During the real run, we would have to apply the iboost tax */
1314                            dbytes = s->scaled_length * rc->pb_iboost_tax_ratio;
1315    
1316              dbytes = s->scaled_length / rc->movie_curve;                          /* Update the symmetric curve compression total */
1317              dbytes2 = 0; /* XXX: warning */                          symetric_total += dbytes;
             total1 += dbytes;  
             if (s->type == XVID_TYPE_BVOP)  
                 dbytes *= rc->avg_length[XVID_TYPE_PVOP-1] / rc->avg_length[XVID_TYPE_BVOP-1];  
1318    
1319                          if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                          /* Apply assymetric curve compression */
1320                                  dbytes2=((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_high / 100.0);                          if (dbytes > rc->avg_length[s->type-1])
1321                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * (double)rc->param.curve_compression_high / 100.0f;
1322                            else
1323                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * (double)rc->param.curve_compression_low  / 100.0f;
1324    
1325                            /* Cap to the minimum frame size if needed */
1326                            if (dbytes + assymetric_delta < rc->min_length[s->type-1])
1327                                    assymetric_delta = rc->min_length[s->type-1] - dbytes;
1328    
1329                            /* Accumulate after assymetric curve compression */
1330                            assymetric_delta_total += assymetric_delta;
1331                    }
1332    
1333                    /* Compute the tax that all p/b frames have to pay in order to respect the
1334                     * bit distribution changes that the assymetric compression curve imposes
1335                     * We want assymetric_total = sum(0, n-1, tax.scaled_length)
1336                     *      ie assymetric_total = ratio.sum(0, n-1, scaled_length)
1337                     *         ratio = assymetric_total / symmetric_total */
1338                    rc->assymetric_tax_ratio = ((double)symetric_total - (double)assymetric_delta_total) / (double)symetric_total;
1339                          } else {                          } else {
1340                                  dbytes2 = ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_low / 100.0);                  rc->assymetric_tax_ratio = 1.0f;
1341                          }                          }
1342    
1343              if (s->type == XVID_TYPE_BVOP) {          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Assymetric tax ratio:%.2f\n", rc->assymetric_tax_ratio);
1344                              dbytes2 *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
1345                              if (dbytes2 < rc->min_length[XVID_TYPE_BVOP-1])          /* Last bits that need to be reset */
1346                                      dbytes2 = rc->min_length[XVID_TYPE_BVOP-1];          rc->overflow = 0;
1347              }else{          rc->KFoverflow = 0;
1348                              if (dbytes2 < rc->min_length[XVID_TYPE_PVOP-1])          rc->KFoverflow_partial = 0;
1349                                      dbytes2 = rc->min_length[XVID_TYPE_PVOP-1];          rc->KF_idx = 0;
1350            rc->desired_total = 0;
1351            rc->real_total = 0;
1352    
1353            /* Job done */
1354            return;
1355              }              }
1356              total2 += dbytes2;  
1357    /*****************************************************************************
1358     * Still more low level stuff (nothing to do with stats treatment)
1359     ****************************************************************************/
1360    
1361    /* This function returns an allocated string containing a complete line read
1362     * from the file starting at the current position */
1363    static char *
1364    readline(FILE *f)
1365    {
1366            char *buffer = NULL;
1367            int buffer_size = 0;
1368            int pos = 0;
1369    
1370            do {
1371                    int c;
1372    
1373                    /* Read a character from the stream */
1374                    c = fgetc(f);
1375    
1376                    /* Is that EOF or new line ? */
1377                    if(c == EOF || c == '\n')
1378                            break;
1379    
1380                    /* Do we have to update buffer ? */
1381                    if(pos >= buffer_size - 1) {
1382                            buffer_size += BUF_SZ;
1383                            buffer = (char*)realloc(buffer, buffer_size);
1384                            if (buffer == NULL)
1385                                    return(NULL);
1386          }          }
1387    
1388                    buffer[pos] = c;
1389                    pos++;
1390            } while(1);
1391    
1392            /* Read \n or EOF */
1393            if (buffer == NULL) {
1394                    /* EOF, so we reached the end of the file, return NULL */
1395                    if(feof(f))
1396                            return(NULL);
1397    
1398                    /* Just an empty line with just a newline, allocate a 1 byte buffer to
1399                     * store a zero length string */
1400                    buffer = (char*)malloc(1);
1401                    if(buffer == NULL)
1402                            return(NULL);
1403      }      }
1404    
1405      rc->curve_comp_scale = total1 / total2;          /* Zero terminated string */
1406            buffer[pos] = '\0';
1407    
1408          DPRINTF(XVID_DEBUG_RC, "middle frame size for asymmetric curve compression: %i\n",          return(buffer);
1409              (int)(rc->avg_length[XVID_TYPE_PVOP-1] * rc->curve_comp_scale));  }
1410    
1411      rc->overflow = 0;  /* This function returns a pointer to the first non space char in the given
1412      rc->KFoverflow = 0;   * string */
1413      rc->KFoverflow_partial = 0;  static char *
1414      rc->KF_idx = 1;  skipspaces(char *string)
1415    {
1416            const char spaces[] =
1417                    {
1418                            ' ','\t','\0'
1419                    };
1420            const char *spacechar = spaces;
1421    
1422            if (string == NULL) return(NULL);
1423    
1424            while (*string != '\0') {
1425                    /* Test against space chars */
1426                    while (*spacechar != '\0') {
1427                            if (*string == *spacechar) {
1428                                    string++;
1429                                    spacechar = spaces;
1430                                    break;
1431                            }
1432                            spacechar++;
1433                    }
1434    
1435                    /* No space char */
1436                    if (*spacechar == '\0') return(string);
1437            }
1438    
1439            return(string);
1440    }
1441    
1442    /* This function returns a boolean that tells if the string is only a
1443     * comment */
1444    static int
1445    iscomment(char *string)
1446    {
1447            const char comments[] =
1448                    {
1449                            '#',';', '%', '\0'
1450                    };
1451            const char *cmtchar = comments;
1452            int iscomment = 0;
1453    
1454            if (string == NULL) return(1);
1455    
1456            string = skipspaces(string);
1457    
1458            while(*cmtchar != '\0') {
1459                    if(*string == *cmtchar) {
1460                            iscomment = 1;
1461                            break;
1462  }  }
1463                    cmtchar++;
1464            }
1465    
1466            return(iscomment);
1467    }
1468    
1469    #if 0
1470    static void
1471    stats_print(rc_2pass2_t * rc)
1472    {
1473            int i;
1474            const char frame_type[4] = { 'i', 'p', 'b', 's'};
1475    
1476            for (i=0; i<rc->num_frames; i++) {
1477                    twopass_stat_t *s = &rc->stats[i];
1478                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- frame:%d type:%c quant:%d stats:%d scaled:%d desired:%d actual:%d overflow(%c):%.2f\n",
1479                                    i, frame_type[s->type-1], -1, s->length, s->scaled_length,
1480                                    s->desired_length, -1, frame_type[s->type-1], -1.0f);
1481            }
1482    }
1483    #endif
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