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revision 1049, Thu May 29 12:38:44 2003 UTC revision 1219, Wed Nov 19 15:59:41 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 1.1.2.16 2003-05-29 12:38:44 edgomez Exp $   * $Id: plugin_2pass2.c,v 1.1.2.27 2003-11-19 15:59:41 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 132  Line 220 
220  {  {
221      switch(opt) {      switch(opt) {
222      case XVID_PLG_INFO :      case XVID_PLG_INFO :
223            case XVID_PLG_FRAME :
224          return 0;          return 0;
225    
226      case XVID_PLG_CREATE :      case XVID_PLG_CREATE :
# Line 155  Line 244 
244   ****************************************************************************/   ****************************************************************************/
245    
246  /* First a few local helping function prototypes */  /* First a few local helping function prototypes */
247  static  int det_stats_length(rc_2pass2_t * rc, char * filename);  static  int statsfile_count_frames(rc_2pass2_t * rc, char * filename);
248  static  int load_stats(rc_2pass2_t *rc, char * filename);  static  int statsfile_load(rc_2pass2_t *rc, char * filename);
249  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);
250  static void internal_scale(rc_2pass2_t *rc);  static void first_pass_stats_prepare_data(rc_2pass2_t * rc);
251  static void pre_process0(rc_2pass2_t * rc);  static void first_pass_scale_curve_internal(rc_2pass2_t *rc);
252  static void pre_process1(rc_2pass2_t * rc);  static void scaled_curve_apply_advanced_parameters(rc_2pass2_t * rc);
253    #if 0
254    static void stats_print(rc_2pass2_t * rc);
255    #endif
256    
257  /*----------------------------------------------------------------------------  /*----------------------------------------------------------------------------
258   *--------------------------------------------------------------------------*/   *--------------------------------------------------------------------------*/
# Line 178  Line 270 
270    
271      rc->param = *param;      rc->param = *param;
272    
273          /*          /* Initialize all defaults */
          * Initialize all defaults  
          */  
274  #define _INIT(a, b) if((a) <= 0) (a) = (b)  #define _INIT(a, b) if((a) <= 0) (a) = (b)
275      /* Let's set our defaults if needed */      /* Let's set our defaults if needed */
276          _INIT(rc->param.keyframe_boost, DEFAULT_KEYFRAME_BOOST);          _INIT(rc->param.keyframe_boost, DEFAULT_KEYFRAME_BOOST);
277          _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);  
278      _INIT(rc->param.curve_compression_high, DEFAULT_CURVE_COMPRESSION_HIGH);      _INIT(rc->param.curve_compression_high, DEFAULT_CURVE_COMPRESSION_HIGH);
279      _INIT(rc->param.curve_compression_low, DEFAULT_CURVE_COMPRESSION_LOW);      _INIT(rc->param.curve_compression_low, DEFAULT_CURVE_COMPRESSION_LOW);
280      _INIT(rc->param.max_overflow_improvement, DEFAULT_MAX_OVERFLOW_IMPROVEMENT);      _INIT(rc->param.max_overflow_improvement, DEFAULT_MAX_OVERFLOW_IMPROVEMENT);
281      _INIT(rc->param.max_overflow_degradation,  DEFAULT_MAX_OVERFLOW_DEGRADATION);      _INIT(rc->param.max_overflow_degradation,  DEFAULT_MAX_OVERFLOW_DEGRADATION);
282    
283      /* Keyframe settings */      /* Keyframe settings */
         _INIT(rc->param.kftreshold, DEFAULT_KFTRESHOLD);  
284      _INIT(rc->param.kfreduction, DEFAULT_KFREDUCTION);      _INIT(rc->param.kfreduction, DEFAULT_KFREDUCTION);
285      _INIT(rc->param.min_key_interval, DEFAULT_MIN_KEY_INTERVAL);      _INIT(rc->param.min_key_interval, DEFAULT_MIN_KEY_INTERVAL);
286  #undef _INIT  #undef _INIT
287    
288          /* Initialize some stuff to zero */          /* Initialize some stuff to zero */
         for(i=0; i<32; i++) rc->quant_count[i] = 0;  
   
289          for(i=0; i<3; i++) {          for(i=0; i<3; i++) {
290                  int j;                  int j;
291                  for (j=0; j<32; j++)                  for (j=0; j<32; j++) {
292                          rc->quant_error[i][j] = 0;                          rc->quant_error[i][j] = 0;
293                            rc->quant_count[i][j] = 0;
294                    }
295          }          }
296    
297          for (i=0; i<3; i++)          for (i=0; i<3; i++) rc->last_quant[i] = 0;
                 rc->last_quant[i] = 0;  
298    
299          rc->fq_error = 0;          rc->fq_error = 0;
300    
301          /* Count frames in the stats file */          /* Count frames (and intra frames) in the stats file, store the result into
302          if (!det_stats_length(rc, param->filename)) {           * the rc structure */
303                  DPRINTF(XVID_DEBUG_RC,"ERROR: fopen %s failed\n", param->filename);          if (statsfile_count_frames(rc, param->filename) == -1) {
304                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- ERROR: fopen %s failed\n", param->filename);
305                  free(rc);                  free(rc);
306                  return XVID_ERR_FAIL;                  return(XVID_ERR_FAIL);
307          }          }
308    
309      /* Allocate the stats' memory */      /* Allocate the stats' memory */
310          if ((rc->stats = malloc(rc->num_frames * sizeof(stat_t))) == NULL) {          if ((rc->stats = malloc(rc->num_frames * sizeof(twopass_stat_t))) == NULL) {
311          free(rc);          free(rc);
312          return XVID_ERR_MEMORY;                  return(XVID_ERR_MEMORY);
313      }      }
314    
315      /*          /* Allocate keyframes location's memory
316           * 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  
          */  
317          rc->keyframe_locations = malloc((rc->num_keyframes + 1) * sizeof(int));          rc->keyframe_locations = malloc((rc->num_keyframes + 1) * sizeof(int));
318          if (rc->keyframe_locations == NULL) {          if (rc->keyframe_locations == NULL) {
319                  free(rc->stats);                  free(rc->stats);
320                  free(rc);                  free(rc);
321                  return XVID_ERR_MEMORY;                  return(XVID_ERR_MEMORY);
322          }          }
323    
324          if (!load_stats(rc, param->filename)) {          /* Load the first pass stats */
325                  DPRINTF(XVID_DEBUG_RC,"ERROR: fopen %s failed\n", param->filename);          if (statsfile_load(rc, param->filename) == -1) {
326                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- ERROR: fopen %s failed\n", param->filename);
327                  free(rc->keyframe_locations);                  free(rc->keyframe_locations);
328                  free(rc->stats);                  free(rc->stats);
329                  free(rc);                  free(rc);
# Line 244  Line 331 
331          }          }
332    
333          /* Compute the target filesize */          /* Compute the target filesize */
334          if (rc->num_frames  < create->fbase/create->fincr) {          if (rc->param.bitrate<0) {
335                    /* if negative, bitrate equals the target (in kbytes) */
336                    rc->target = (-rc->param.bitrate) * 1024;
337            } else if (rc->num_frames  < create->fbase/create->fincr) {
338                  /* 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 */
339                  rc->target = rc->param.bitrate / 8;                  rc->target = rc->param.bitrate / 8;
340          } else {          } else {
# Line 255  Line 345 
345                          ((uint64_t)create->fbase * 8);                          ((uint64_t)create->fbase * 8);
346          }          }
347    
348          DPRINTF(XVID_DEBUG_RC, "Frame rate: %d/%d (%ffps)\n",          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Frame rate: %d/%d (%ffps)\n",
349                          create->fbase, create->fincr,                          create->fbase, create->fincr,
350                          (double)create->fbase/(double)create->fincr);                          (double)create->fbase/(double)create->fincr);
351          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);
352          DPRINTF(XVID_DEBUG_RC, "Target bitrate: %ld\n", rc->param.bitrate);          if(rc->param.bitrate>=0)
353          DPRINTF(XVID_DEBUG_RC, "Target filesize: %lld\n", rc->target);                  DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Target bitrate: %ld\n", rc->param.bitrate);
354            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Target filesize: %lld\n", rc->target);
355    
356          /* Compensate the average frame overhead caused by the container */          /* Compensate the average frame overhead caused by the container */
357          rc->target -= rc->num_frames*rc->param.container_frame_overhead;          rc->target -= rc->num_frames*rc->param.container_frame_overhead;
358          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);
359          DPRINTF(XVID_DEBUG_RC, "Target filesize (after container compensation): %lld\n", rc->target);          if(rc->param.container_frame_overhead)
360                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- New target filesize after container compensation: %lld\n", rc->target);
361    
362          /*          /* Gathers some information about first pass stats:
          * First data pre processing:  
363           *  - finds the minimum frame length for each frame type during 1st pass.           *  - finds the minimum frame length for each frame type during 1st pass.
364           *     rc->min_size[]           *     rc->min_size[]
365           *  - determines the maximum frame length observed (no frame type distinction).           *  - determines the maximum frame length observed (no frame type distinction).
# Line 280  Line 371 
371           *  - store keyframe location           *  - store keyframe location
372           *     rc->keyframe_locations[]           *     rc->keyframe_locations[]
373           */           */
374          pre_process0(rc);          first_pass_stats_prepare_data(rc);
375    
376          /*          /* When bitrate is not given it means it has been scaled by an external
377           * When bitrate is not given it means it has been scaled by an external           * application */
          * application  
          */  
378          if (rc->param.bitrate) {          if (rc->param.bitrate) {
379                  /* Apply zone settings */                  /* Apply zone settings */
380                  zone_process(rc, create);                  zone_process(rc, create);
381                  /* Perform curve scaling */                  /* Perform internal curve scaling */
382                  internal_scale(rc);                  first_pass_scale_curve_internal(rc);
383          } else {          } else {
384                  /* External scaling -- zones are ignored */                  /* External scaling -- zones are ignored */
385                  for (i=0;i<rc->num_frames;i++) {                  for (i=0;i<rc->num_frames;i++) {
# Line 301  Line 390 
390                  rc->tot_quant = 0;                  rc->tot_quant = 0;
391          }          }
392    
393          pre_process1(rc);          /* Apply advanced curve options, and compute some parameters in order to
394             * shape the curve in the BEFORE/AFTER pair of functions */
395            scaled_curve_apply_advanced_parameters(rc);
396    
397          *handle = rc;          *handle = rc;
398          return(0);          return(0);
# Line 313  Line 404 
404  static int  static int
405  rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy)  rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy)
406  {  {
407            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- target_total:%lld desired_total:%.2f (%.2f%%) actual_total:%.2f (%.2f%%)\n",
408                            rc->target,
409                            rc->desired_total,
410                            100*rc->desired_total/(double)rc->target,
411                            rc->real_total,
412                            100*rc->real_total/(double)rc->target);
413    
414      free(rc->keyframe_locations);      free(rc->keyframe_locations);
415      free(rc->stats);      free(rc->stats);
416          free(rc);          free(rc);
# Line 325  Line 423 
423  static int  static int
424  rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)  rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)
425  {  {
426          stat_t * s = &rc->stats[data->frame_num];          twopass_stat_t * s = &rc->stats[data->frame_num];
         int overflow;  
         int desired;  
427          double dbytes;          double dbytes;
         double curve_temp;  
428          double scaled_quant;          double scaled_quant;
429            double overflow;
430          int capped_to_max_framesize = 0;          int capped_to_max_framesize = 0;
431    
432          /*          /* This function is quite long but easy to understand. In order to simplify
433           * 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.  
          */  
434    
435          /* First case: Another plugin has already set a quantizer */          /* First case: Another plugin has already set a quantizer */
436      if (data->quant > 0)      if (data->quant > 0)
# Line 355  Line 449 
449    
450          /* Third case: insufficent stats data */          /* Third case: insufficent stats data */
451          if (data->frame_num >= rc->num_frames)          if (data->frame_num >= rc->num_frames)
452                  return 0;                  return(0);
   
         /*  
          * The last case is the one every normal minded developer should fear to  
          * maintain in a project :-)  
          */  
453    
454          /* XXX: why by 8 */          /*************************************************************************/
455          overflow = rc->overflow / 8;          /*************************************************************************/
456            /*************************************************************************/
457    
458          /*          /*-------------------------------------------------------------------------
459           * The rc->overflow field represents the overflow in current scene (between two           * Frame bit allocation first part
460           * IFrames) so we must not forget to reset it if we are entering a new scene           *
461           */           * First steps apply user settings, just like it is done in the theoritical
462          if (s->type == XVID_TYPE_IVOP)           * scaled_curve_apply_advanced_parameters
463                  overflow = 0;           *-----------------------------------------------------------------------*/
464    
465          desired = s->scaled_length;          /* Set desired to what we are wanting to obtain for this frame */
466            dbytes = (double)s->scaled_length;
467    
468          dbytes = desired;          /* IFrame user settings*/
469          if (s->type == XVID_TYPE_IVOP)          if (s->type == XVID_TYPE_IVOP) {
                 dbytes += desired * rc->param.keyframe_boost / 100;  
         dbytes /= rc->movie_curve;  
470    
471          /*                  /* Keyframe boosting -- All keyframes benefit from it */
472           * 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];  
473    
474          /*                  /* Applies keyframe penalties, but not the first frame */
475           * Apply user's choosen Payback method. Payback helps bitrate to follow the                  if (rc->KF_idx) {
476           * scaled curve "paying back" past errors in curve previsions.                          int penalty_distance;
477           */  
478          if (rc->param.payback_method == XVID_PAYBACK_BIAS) {                          /* Minimum keyframe distance penalties */
479                  desired = (int)(rc->curve_comp_error / rc->param.bitrate_payback_delay);                          penalty_distance  = rc->param.min_key_interval;
480                            penalty_distance -= rc->keyframe_locations[rc->KF_idx];
481                            penalty_distance += rc->keyframe_locations[rc->KF_idx-1];
482    
483                            /* Ah ah ! guilty keyframe, you're under arrest ! */
484                            if (penalty_distance > 0)
485                                    dbytes -= dbytes*penalty_distance*rc->param.kfreduction/100;
486                    }
487          } else {          } else {
                 desired = (int)(rc->curve_comp_error * dbytes /  
                                                 rc->avg_length[XVID_TYPE_PVOP-1] / rc->param.bitrate_payback_delay);  
488    
489                  if (labs(desired) > fabs(rc->curve_comp_error)) {                  /* P/S/B frames must reserve some bits for iframe boosting */
490                          desired = (int)rc->curve_comp_error;                  dbytes *= rc->pb_iboost_tax_ratio;
491    
492                    /* Apply assymetric curve compression */
493                    if (rc->param.curve_compression_high || rc->param.curve_compression_low) {
494                            double assymetric_delta;
495    
496                            /* Compute the assymetric delta, this is computed before applying
497                             * the tax, as done in the pre_process function */
498                            if (dbytes > rc->avg_length[s->type-1])
499                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_high / 100.0;
500                            else
501                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_low  / 100.0;
502    
503                            /* Now we must apply the assymetric tax, else our curve compression
504                             * would not give a theoritical target size equal to what it is
505                             * expected */
506                            dbytes *= rc->assymetric_tax_ratio;
507    
508                            /* Now we can add the assymetric delta */
509                            dbytes += assymetric_delta;
510                  }                  }
511          }          }
512    
513          rc->curve_comp_error -= desired;          /* That is what we would like to have -- Don't put that chunk after
514             * overflow control, otherwise, overflow is counted twice and you obtain
515             * half sized bitrate sequences */
516            s->desired_length  = (int)dbytes;
517            rc->desired_total += dbytes;
518    
519          /* XXX: warning */          /*------------------------------------------------------------------------
520          curve_temp = 0;           * Frame bit allocation: overflow control part.
521             *
522             * Unlike the theoritical scaled_curve_apply_advanced_parameters, here
523             * it's real encoding and we need to make sure we don't go so far from
524             * what is our ideal scaled curve.
525             *-----------------------------------------------------------------------*/
526    
527          if ((rc->param.curve_compression_high + rc->param.curve_compression_low) &&     s->type != XVID_TYPE_IVOP) {          /* Compute the overflow we should compensate */
528            if (s->type != XVID_TYPE_IVOP) {
529                    double frametype_factor;
530                    double framesize_factor;
531    
532                  curve_temp = rc->curve_comp_scale;                  /* Take only the desired part of overflow */
533                  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);  
                 }  
534    
535                  /*                  /* Factor that will take care to decrease the overflow applied
536                   * End of code path for curve_temp, as told earlier, we are now                   * according to the importance of this frame type in term of
537                   * obliged to scale the value to a bframe one using the inverse                   * overall size */
538                   * ratio applied earlier                  frametype_factor  = rc->count[XVID_TYPE_IVOP-1]*rc->avg_length[XVID_TYPE_IVOP-1];
539                   */                  frametype_factor += rc->count[XVID_TYPE_PVOP-1]*rc->avg_length[XVID_TYPE_PVOP-1];
540                  if (s->type == XVID_TYPE_BVOP)                  frametype_factor += rc->count[XVID_TYPE_BVOP-1]*rc->avg_length[XVID_TYPE_BVOP-1];
541                          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];
542                    frametype_factor  = 1/frametype_factor;
543    
544                    /* Factor that will take care not to compensate too much for this frame
545                     * size */
546                    framesize_factor  = dbytes;
547                    framesize_factor /= rc->avg_length[s->type-1];
548    
549                  desired += (int)curve_temp;                  /* Treat only the overflow part concerned by this frame type and size */
550                  rc->curve_comp_error += curve_temp - (int)curve_temp;                  overflow *= frametype_factor;
551          } else {  #if 0
552                  /*                  /* Leave this one alone, as it impacts badly on quality */
553                   * End of code path for dbytes, as told earlier, we are now                  overflow *= framesize_factor;
554                   * 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];  
555    
556                  desired += (int)dbytes;                  /* Apply the overflow strength imposed by the user */
557                  rc->curve_comp_error += dbytes - (int)dbytes;                  overflow *= (rc->param.overflow_control_strength/100.0f);
558            } else {
559                    /* no overflow applied in IFrames because:
560                     *  - their role is important as they're references for P/BFrames.
561                     *  - there aren't much in typical sequences, so if an IFrame overflows too
562                     *    much, this overflow may impact the next IFrame too much and generate
563                     *    a sequence of poor quality frames */
564                    overflow = 0;
565          }          }
566    
567            /* Make sure we are not trying to compensate more overflow than we even have */
568            if (fabs(overflow) > fabs(rc->overflow))
569                    overflow = rc->overflow;
570    
571          /*          /* Make sure the overflow doesn't make the frame size to get out of the range
572           * We can't do bigger frames than first pass, this would be stupid as first           * [-max_degradation..+max_improvment] */
573           * 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) {
574           * many bytes and we would not not gain much quality.                  if(overflow <= dbytes)
575           */                          dbytes += dbytes * rc->param.max_overflow_improvement / 100;
576          if (desired > s->length) {                  else
577                  rc->curve_comp_error += desired - s->length;                          dbytes += overflow * rc->param.max_overflow_improvement / 100;
578                  desired = s->length;          } else if (overflow < - dbytes * rc->param.max_overflow_degradation / 100) {
579                    dbytes -= dbytes * rc->param.max_overflow_degradation / 100;
580          } else {          } else {
581                  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];  
                 }  
582          }          }
583    
584          s->desired_length = desired;          /*-------------------------------------------------------------------------
585             * Frame bit allocation last part:
586             *
587          /*           * Cap frame length so we don't reach neither bigger frame sizes than first
588           * if this keyframe is too close to the next, reduce it's byte allotment           * pass nor smaller than the allowed minimum.
589           * XXX: why do we do this after setting the desired length ?           *-----------------------------------------------------------------------*/
590           */  
591            if (dbytes > s->length) {
592          if (s->type == XVID_TYPE_IVOP) {                  dbytes = s->length;
593                  int KFdistance = rc->keyframe_locations[rc->KF_idx] - rc->keyframe_locations[rc->KF_idx - 1];          } else if (dbytes < rc->min_length[s->type-1]) {
594                    dbytes = rc->min_length[s->type-1];
595                  if (KFdistance < rc->param.kftreshold) {          } else if (dbytes > rc->max_length) {
596                    /* ToDo: this condition is always wrong as max_length == maximum frame
597                     * length of first pass, so the first condition already caps the frame
598                     * size... */
599                    capped_to_max_framesize = 1;
600                    dbytes = rc->max_length;
601                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- frame:%d Capped to maximum frame size\n",
602                                    data->frame_num);
603            }
604    
605                          KFdistance -= rc->param.min_key_interval;          /*------------------------------------------------------------------------
606             * Desired frame length <-> quantizer mapping
607             *-----------------------------------------------------------------------*/
608    
609                          if (KFdistance >= 0) {          /* For bframes we must retrieve the original quant used (sent to xvidcore)
610                                  int KF_min_size;           * as core applies the bquant formula before writing the stat log entry */
611            if(s->type == XVID_TYPE_BVOP) {
612    
613                                  KF_min_size = desired * (100 - rc->param.kfreduction) / 100;                  twopass_stat_t *b_ref = s;
                                 if (KF_min_size < 1)  
                                         KF_min_size = 1;  
614    
615                                  desired = KF_min_size + (desired - KF_min_size) * KFdistance /                  /* Find the reference frame */
616                                          (rc->param.kftreshold - rc->param.min_key_interval);                  while(b_ref != &rc->stats[0] && b_ref->type == XVID_TYPE_BVOP)
617                            b_ref--;
618    
619                                  if (desired < 1)                  /* Compute the original quant */
620                                          desired = 1;                  s->quant  = 2*(100*s->quant - data->bquant_offset);
621                          }                  s->quant += data->bquant_ratio - 1; /* to avoid rouding issues */
622                  }                  s->quant  = s->quant/data->bquant_ratio - b_ref->quant;
623          }          }
624    
625          overflow = (int)((double)overflow * desired / rc->avg_length[XVID_TYPE_PVOP-1]);          /* Don't laugh at this very 'simple' quant<->filesize relationship, it
626             * proves to be acurate enough for our algorithm */
627          /* 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;  
628    
629          /* Make sure overflow doesn't run away */  #ifdef COMPENSATE_FORMULA
630          if (overflow > desired * rc->param.max_overflow_improvement / 100) {          /* We know xvidcore will apply the bframe formula again, so we compensate
631                  desired += (overflow <= desired) ? desired * rc->param.max_overflow_improvement / 100 :           * it right now to make sure we would not apply it twice */
632                          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;  
         }  
633    
634          /* 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);  
         }  
635    
636          /* Make sure to not scale below the minimum framesize */                  /* Find the reference frame */
637          if (desired < rc->min_length[s->type-1]) {                  while(b_ref != &rc->stats[0] && b_ref->type == XVID_TYPE_BVOP)
638                  desired = rc->min_length[s->type-1];                          b_ref--;
639                  DPRINTF(XVID_DEBUG_RC,"[%i] Capped to minimum frame size\n",  
640                                  data->frame_num);                  /* Compute the quant it would be if the core did not apply the bframe
641                     * formula */
642                    scaled_quant  = 100*scaled_quant - data->bquant_offset;
643                    scaled_quant += data->bquant_ratio - 1; /* to avoid rouding issues */
644                    scaled_quant /= data->bquant_ratio;
645          }          }
646    #endif
647    
648          /*          /* Quantizer has been scaled using floating point operations/results, we
649           * 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  
          */  
650          data->quant = (int)scaled_quant;          data->quant = (int)scaled_quant;
651    
652          /* Let's clip the computed quantizer, if needed */          /* Let's clip the computed quantizer, if needed */
# Line 539  Line 654 
654                  data->quant = 1;                  data->quant = 1;
655          } else if (data->quant > 31) {          } else if (data->quant > 31) {
656                  data->quant = 31;                  data->quant = 31;
657          } else if (s->type != XVID_TYPE_IVOP) {          } else {
658    
659                  /*                  /* 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  
660                   * computed quantizer, do not loose quantizer decimal part that we                   * computed quantizer, do not loose quantizer decimal part that we
661                   * accumulate for later reuse when its sum represents a complete unit.                   * accumulate for later reuse when its sum represents a complete
662                   */                   * unit. */
663                  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;
664    
665                  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 669 
669                          rc->quant_error[s->type-1][data->quant] += 1.0;                          rc->quant_error[s->type-1][data->quant] += 1.0;
670                          data->quant--;                          data->quant--;
671                  }                  }
   
672          }          }
673    
674          /*          /* 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  
675           * possible +1 correction due to cumulated error. We can now safely clip           * possible +1 correction due to cumulated error. We can now safely clip
676           * the quantizer again with user's quant ranges. "Safely" means the Rate           * the quantizer again with user's quant ranges. "Safely" means the Rate
677           * Control could learn more about this quantizer, this knowledge is useful           * Control could learn more about this quantizer, this knowledge is useful
678           * 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,
679           * that's why we don't perform this clipping earlier.           * that's why we don't perform this clipping earlier. */
          */  
680          if (data->quant < data->min_quant[s->type-1]) {          if (data->quant < data->min_quant[s->type-1]) {
681                  data->quant = data->min_quant[s->type-1];                  data->quant = data->min_quant[s->type-1];
682          } else if (data->quant > data->max_quant[s->type-1]) {          } else if (data->quant > data->max_quant[s->type-1]) {
683                  data->quant = data->max_quant[s->type-1];                  data->quant = data->max_quant[s->type-1];
684          }          }
685    
686          /*          /* 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"  
687           * rule that makes |last_quant - new_quant| <= 2. This rule only applies           * rule that makes |last_quant - new_quant| <= 2. This rule only applies
688           * to predicted frames (P and B)           * to predicted frames (P and B) */
          */  
689          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) {
690    
691                  if (data->quant > rc->last_quant[s->type-1] + 2) {                  if (data->quant > rc->last_quant[s->type-1] + 2) {
692                          data->quant = rc->last_quant[s->type-1] + 2;                          data->quant = rc->last_quant[s->type-1] + 2;
693                          DPRINTF(XVID_DEBUG_RC,                          DPRINTF(XVID_DEBUG_RC,
694                                          "[%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",
695                                          data->frame_num);                                          data->frame_num);
696                  }                  }
697                  if (data->quant < rc->last_quant[s->type-1] - 2) {                  if (data->quant < rc->last_quant[s->type-1] - 2) {
698                          data->quant = rc->last_quant[s->type-1] - 2;                          data->quant = rc->last_quant[s->type-1] - 2;
699                          DPRINTF(XVID_DEBUG_RC,                          DPRINTF(XVID_DEBUG_RC,
700                                          "[%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",
701                                          data->frame_num);                                          data->frame_num);
702                  }                  }
703          }          }
704    
705          /*          /* We don't want to pollute the RC histerisis when our computed quant has
706           * 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  
          */  
707          if (capped_to_max_framesize == 0)          if (capped_to_max_framesize == 0)
708                  rc->last_quant[s->type-1] = data->quant;                  rc->last_quant[s->type-1] = data->quant;
709    
710            /* Don't forget to force 1st pass frame type ;-) */
711            data->type = s->type;
712    
713            /* Store the quantizer into the statistics -- Used to compensate the double
714             * formula symptom */
715            s->quant2 = data->quant;
716    
717          return 0;          return 0;
718  }  }
719    
# Line 610  Line 724 
724  rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)  rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)
725  {  {
726          const char frame_type[4] = { 'i', 'p', 'b', 's'};          const char frame_type[4] = { 'i', 'p', 'b', 's'};
727          stat_t * s = &rc->stats[data->frame_num];          twopass_stat_t * s = &rc->stats[data->frame_num];
728    
729          /* Insufficent stats data */          /* Insufficent stats data */
730      if (data->frame_num >= rc->num_frames)      if (data->frame_num >= rc->num_frames)
731          return 0;          return 0;
732    
733      rc->quant_count[data->quant]++;          /* Update the quantizer counter */
734            rc->quant_count[s->type-1][data->quant]++;
735    
736            /* Update the frame type overflow */
737      if (data->type == XVID_TYPE_IVOP) {      if (data->type == XVID_TYPE_IVOP) {
738          int kfdiff = (rc->keyframe_locations[rc->KF_idx] -      rc->keyframe_locations[rc->KF_idx - 1]);                  int kfdiff = 0;
739    
740                    if(rc->KF_idx != rc->num_frames -1) {
741                            kfdiff  = rc->keyframe_locations[rc->KF_idx+1];
742                            kfdiff -= rc->keyframe_locations[rc->KF_idx];
743                    }
744    
745                    /* Flush Keyframe overflow accumulator */
746          rc->overflow += rc->KFoverflow;          rc->overflow += rc->KFoverflow;
747    
748                    /* Store the frame overflow to the keyframe accumulator */
749          rc->KFoverflow = s->desired_length - data->length;          rc->KFoverflow = s->desired_length - data->length;
750    
751          if (kfdiff > 1) {  // non-consecutive keyframes                  if (kfdiff > 1) {
752                            /* Non-consecutive keyframes case:
753                             * We can then divide this total keyframe overflow into equal parts
754                             * that we will distribute into regular overflow at each frame
755                             * between the sequence bounded by two IFrames */
756              rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);              rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);
757          }else{ // consecutive keyframes                  } else {
758                            /* Consecutive keyframes case:
759                             * Flush immediatly the keyframe overflow and reset keyframe
760                             * overflow */
761                          rc->overflow += rc->KFoverflow;                          rc->overflow += rc->KFoverflow;
762                          rc->KFoverflow = 0;                          rc->KFoverflow = 0;
763                          rc->KFoverflow_partial = 0;                          rc->KFoverflow_partial = 0;
764          }          }
765          rc->KF_idx++;          rc->KF_idx++;
766      } else {      } else {
767          // distribute part of the keyframe overflow                  /* Accumulate the frame overflow */
768          rc->overflow += s->desired_length - data->length + rc->KFoverflow_partial;                  rc->overflow += s->desired_length - data->length;
769    
770                    /* Distribute part of the keyframe overflow */
771                    rc->overflow += rc->KFoverflow_partial;
772    
773                    /* Don't forget to substract that same amount from the total keyframe
774                     * overflow */
775          rc->KFoverflow -= rc->KFoverflow_partial;          rc->KFoverflow -= rc->KFoverflow_partial;
776      }      }
777    
778          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;
779            rc->real_total += data->length;
780    
781            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",
782                          data->frame_num,                          data->frame_num,
783                          frame_type[data->type-1],                          frame_type[data->type-1],
784                          data->quant,                          data->quant,
785                          s->length,                          s->length,
786                          s->scaled_length,                          s->scaled_length,
                         data->length,  
787                          s->desired_length,                          s->desired_length,
788                            s->desired_length - s->error,
789                            -s->error,
790                          rc->overflow);                          rc->overflow);
791    
792      return(0);      return(0);
# Line 655  Line 796 
796   * Helper functions definition   * Helper functions definition
797   ****************************************************************************/   ****************************************************************************/
798    
799    /* Default buffer size for reading lines */
800  #define BUF_SZ   1024  #define BUF_SZ   1024
 #define MAX_COLS 5  
801    
802  /* open stats file, and count num frames */  /* Helper functions for reading/parsing the stats file */
803    static char *skipspaces(char *string);
804    static int iscomment(char *string);
805    static char *readline(FILE *f);
806    
807    /* This function counts the number of frame entries in the stats file
808     * It also counts the number of I Frames */
809  static int  static int
810  det_stats_length(rc_2pass2_t * rc, char * filename)  statsfile_count_frames(rc_2pass2_t * rc, char * filename)
811  {  {
812      FILE * f;      FILE * f;
813      int n, ignore;          char *line;
814      char type;          int lines;
815    
816      rc->num_frames = 0;      rc->num_frames = 0;
817      rc->num_keyframes = 0;      rc->num_keyframes = 0;
818    
819      if ((f = fopen(filename, "rt")) == NULL)          if ((f = fopen(filename, "rb")) == NULL)
820          return 0;                  return(-1);
821    
822      while((n = fscanf(f, "%c %d %d %d %d %d %d\n",          lines = 0;
823          &type, &ignore, &ignore, &ignore, &ignore, &ignore, &ignore)) != EOF) {          while ((line = readline(f)) != NULL) {
824          if (type == 'i') {  
825              rc->num_frames++;                  char *ptr;
826                    char type;
827                    int fields;
828    
829                    lines++;
830    
831                    /* We skip spaces */
832                    ptr = skipspaces(line);
833    
834                    /* Skip coment lines or empty lines */
835                    if(iscomment(ptr) || *ptr == '\0') {
836                            free(line);
837                            continue;
838                    }
839    
840                    /* Read the stat line from buffer */
841                    fields = sscanf(ptr, "%c", &type);
842    
843                    /* Valid stats files have at least 6 fields */
844                    if (fields == 1) {
845                            switch(type) {
846                            case 'i':
847                            case 'I':
848              rc->num_keyframes++;              rc->num_keyframes++;
849          }else if (type == 'p' || type == 'b' || type == 's') {                          case 'p':
850                            case 'P':
851                            case 'b':
852                            case 'B':
853                            case 's':
854                            case 'S':
855              rc->num_frames++;              rc->num_frames++;
856                                    break;
857                            default:
858                                    DPRINTF(XVID_DEBUG_RC,
859                                                    "[xvid rc] -- WARNING: L%d unknown frame type used (%c).\n",
860                                                    lines, type);
861          }          }
862                    } else {
863                                    DPRINTF(XVID_DEBUG_RC,
864                                                    "[xvid rc] -- WARNING: L%d misses some stat fields (%d).\n",
865                                                    lines, 6-fields);
866                    }
867    
868                    /* Free the line buffer */
869                    free(line);
870      }      }
871    
872            /* We are done with the file */
873      fclose(f);      fclose(f);
874    
875      return 1;          return(0);
876  }  }
877    
878  /* open stats file(s) and read into rc->stats array */  /* open stats file(s) and read into rc->stats array */
   
879  static int  static int
880  load_stats(rc_2pass2_t *rc, char * filename)  statsfile_load(rc_2pass2_t *rc, char * filename)
881  {  {
882      FILE * f;      FILE * f;
883      int i, not_scaled;          int processed_entries;
884    
885            /* Opens the file */
886            if ((f = fopen(filename, "rb"))==NULL)
887                    return(-1);
888    
889      if ((f = fopen(filename, "rt"))==NULL)          processed_entries = 0;
890          return 0;          while(processed_entries < rc->num_frames) {
   
     i = 0;  
         not_scaled = 0;  
     while(i < rc->num_frames) {  
         stat_t * s = &rc->stats[i];  
         int n;  
891          char type;          char type;
892                    int fields;
893                    twopass_stat_t * s = &rc->stats[processed_entries];
894                    char *line, *ptr;
895    
896                    /* Read the line from the file */
897                    if((line = readline(f)) == NULL)
898                            break;
899    
900                    /* We skip spaces */
901                    ptr = skipspaces(line);
902    
903                    /* Skip comment lines or empty lines */
904                    if(iscomment(ptr) || *ptr == '\0') {
905                            free(line);
906                            continue;
907                    }
908    
909                    /* Reset this field that is optional */
910                  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;  
                 }  
911    
912          if (type == 'i') {                  /* Convert the fields */
913                    fields = sscanf(ptr,
914                                                    "%c %d %d %d %d %d %d\n",
915                                                    &type,
916                                                    &s->quant,
917                                                    &s->blks[0], &s->blks[1], &s->blks[2],
918                                                    &s->length,
919                                                    &s->scaled_length);
920    
921                    /* Free line buffer, we don't need it anymore */
922                    free(line);
923    
924                    /* Fail silently, this has probably been warned in
925                     * statsfile_count_frames */
926                    if(fields != 6 && fields != 7)
927                            continue;
928    
929                    /* Convert frame type */
930                    switch(type) {
931                    case 'i':
932                    case 'I':
933              s->type = XVID_TYPE_IVOP;              s->type = XVID_TYPE_IVOP;
934          }else if (type == 'p' || type == 's') {                          break;
935                    case 'p':
936                    case 'P':
937                    case 's':
938                    case 'S':
939              s->type = XVID_TYPE_PVOP;              s->type = XVID_TYPE_PVOP;
940          }else if (type == 'b') {                          break;
941                    case 'b':
942                    case 'B':
943              s->type = XVID_TYPE_BVOP;              s->type = XVID_TYPE_BVOP;
944          }else{  /* unknown type */                          break;
945              DPRINTF(XVID_DEBUG_RC, "unknown stats frame type; assuming pvop\n");                  default:
946              s->type = XVID_TYPE_PVOP;                          /* Same as before, fail silently */
947                            continue;
948          }          }
949    
950          i++;                  /* Ok it seems it's been processed correctly */
951                    processed_entries++;
952      }      }
953    
954      rc->num_frames = i;          /* Close the file */
   
955          fclose(f);          fclose(f);
956    
957      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);  
     }  
958  }  }
 #endif  
959    
960  /* pre-process the statistics data  /* pre-process the statistics data
961      - for each type, count, tot_length, min_length, max_length   * - for each type, count, tot_length, min_length, max_length
962      - set keyframes_locations   * - set keyframes_locations */
 */  
   
963  static void  static void
964  pre_process0(rc_2pass2_t * rc)  first_pass_stats_prepare_data(rc_2pass2_t * rc)
965  {  {
966      int i,j;      int i,j;
967    
968          /*          /* *rc fields initialization
          * *rc fields initialization  
969           * 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
970           *     with real values of the 1pass           *     with real values of the 1pass */
          */  
971           for (i=0; i<3; i++) {           for (i=0; i<3; i++) {
972                  rc->count[i]=0;                  rc->count[i]=0;
973                  rc->tot_length[i] = 0;                  rc->tot_length[i] = 0;
# Line 769  Line 976 
976    
977          rc->max_length = INT_MIN;          rc->max_length = INT_MIN;
978    
979          /*          /* Loop through all frames and find/compute all the stuff this function
980           * Loop through all frames and find/compute all the stuff this function           * is supposed to do */
          * is supposed to do  
          */  
981          for (i=j=0; i<rc->num_frames; i++) {          for (i=j=0; i<rc->num_frames; i++) {
982                  stat_t * s = &rc->stats[i];                  twopass_stat_t * s = &rc->stats[i];
983    
984                  rc->count[s->type-1]++;                  rc->count[s->type-1]++;
985                  rc->tot_length[s->type-1] += s->length;                  rc->tot_length[s->type-1] += s->length;
# Line 793  Line 998 
998                  }                  }
999          }          }
1000    
1001          /*          /* NB:
          * Nota Bene:  
1002           * The "per sequence" overflow system considers a natural sequence to be           * The "per sequence" overflow system considers a natural sequence to be
1003           * 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
1004           * 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
1005           * frame to appear in the keyframe locations array.           * frame to appear in the keyframe locations array. */
          */  
1006      rc->keyframe_locations[j] = i;      rc->keyframe_locations[j] = i;
1007    
1008          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]);
1009          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]);
1010          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]);
1011  }  }
1012    
1013  /* calculate zone weight "center" */  /* calculate zone weight "center" */
   
1014  static void  static void
1015  zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)  zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)
1016  {  {
# Line 850  Line 1052 
1052              next -= create->zones[i].frame;              next -= create->zones[i].frame;
1053              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;
1054              n += next;              n += next;
1055          }else{  // XVID_ZONE_QUANT                  }else{  /* XVID_ZONE_QUANT */
1056              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++ ) {
1057                  rc->stats[j].zone_mode = XVID_ZONE_QUANT;                  rc->stats[j].zone_mode = XVID_ZONE_QUANT;
1058                  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 860  Line 1062 
1062      }      }
1063      rc->avg_weight = n>0 ? rc->avg_weight/n : 1.0;      rc->avg_weight = n>0 ? rc->avg_weight/n : 1.0;
1064    
1065      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);
1066  }  }
1067    
1068    
1069  /* scale the curve */  /* scale the curve */
   
1070  static void  static void
1071  internal_scale(rc_2pass2_t *rc)  first_pass_scale_curve_internal(rc_2pass2_t *rc)
1072  {  {
1073          int64_t target  = rc->target - rc->tot_quant;          int64_t target;
1074          int64_t pass1_length = rc->tot_length[0] + rc->tot_length[1] + rc->tot_length[2] - rc->tot_quant;          int64_t pass1_length;
1075          double scaler;          double scaler;
1076          int i, num_MBs;          int i, num_MBs;
1077    
1078            /* We remove the bytes used by the fixed quantizer zones
1079             * ToDo: this approach is flawed, the same amount of bytes is removed from
1080             *       target and first pass data, this has no sense, zone_process should
1081             *       give us two results one for unscaled data (1pass) and the other
1082             *       one for scaled data and we should then write:
1083             *       target = rc->target - rc->tot_quant_scaled;
1084             *       pass1_length = rc->i+p+b - rc->tot_quant_firstpass */
1085            target = rc->target - rc->tot_quant;
1086    
1087            /* Do the same for the first pass data */
1088            pass1_length  = rc->tot_length[XVID_TYPE_IVOP-1];
1089            pass1_length += rc->tot_length[XVID_TYPE_PVOP-1];
1090            pass1_length += rc->tot_length[XVID_TYPE_BVOP-1];
1091            pass1_length -= rc->tot_quant;
1092    
1093          /* Let's compute a linear scaler in order to perform curve scaling */          /* Let's compute a linear scaler in order to perform curve scaling */
1094          scaler = (double)target / (double)pass1_length;          scaler = (double)target / (double)pass1_length;
1095    
1096          if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {          if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {
1097                  DPRINTF(XVID_DEBUG_RC, "WARNING: Undersize detected\n");                  DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- WARNING: Undersize detected before correction\n");
1098          scaler = 1.0;          scaler = 1.0;
1099          }          }
1100    
1101      DPRINTF(XVID_DEBUG_RC,          /* Compute min frame lengths (for each frame type) according to the number
1102                          "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
1103                          (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.  
1104           *           *
1105           * We compare these hardcoded values with observed values in first pass           * We compare these hardcoded values with observed values in first pass
1106           * (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;  
   
         if(rc->min_length[1] > ((num_MBs) + 88)  / 8)  
                 rc->min_length[1] = ((num_MBs) + 88)  / 8;  
1107    
1108          if(rc->min_length[2] > 8)          /* Number of MBs */
1109                  rc->min_length[2] = 8;          num_MBs  = rc->stats[0].blks[0];
1110            num_MBs += rc->stats[0].blks[1];
1111            num_MBs += rc->stats[0].blks[2];
1112    
1113            /* Minimum for I frames */
1114            if(rc->min_length[XVID_TYPE_IVOP-1] > ((num_MBs*22) + 240) / 8)
1115                    rc->min_length[XVID_TYPE_IVOP-1] = ((num_MBs*22) + 240) / 8;
1116    
1117            /* Minimum for P/S frames */
1118            if(rc->min_length[XVID_TYPE_PVOP-1] > ((num_MBs) + 88)  / 8)
1119                    rc->min_length[XVID_TYPE_PVOP-1] = ((num_MBs) + 88)  / 8;
1120    
1121            /* Minimum for B frames */
1122            if(rc->min_length[XVID_TYPE_BVOP-1] > 8)
1123                    rc->min_length[XVID_TYPE_BVOP-1] = 8;
1124    
1125          /*          /* Perform an initial scale pass.
1126           * Perform an initial scale pass.           *
1127           * If a frame size is scaled underneath our hardcoded minimums, then we           * If a frame size is scaled underneath our hardcoded minimums, then we
1128           * force the frame size to the minimum, and deduct the original & scaled           * force the frame size to the minimum, and deduct the original & scaled
1129           * frame length from the original and target total lengths           * frame length from the original and target total lengths */
          */  
1130          for (i=0; i<rc->num_frames; i++) {          for (i=0; i<rc->num_frames; i++) {
1131                  stat_t * s = &rc->stats[i];                  twopass_stat_t * s = &rc->stats[i];
1132                  int len;                  int len;
1133    
1134                    /* No need to scale frame length for which a specific quantizer is
1135                     * specified thanks to zones */
1136          if (s->zone_mode == XVID_ZONE_QUANT) {          if (s->zone_mode == XVID_ZONE_QUANT) {
1137              s->scaled_length = s->length;              s->scaled_length = s->length;
1138                          continue;                          continue;
# Line 925  Line 1143 
1143    
1144                  /* Compare with the computed minimum */                  /* Compare with the computed minimum */
1145                  if (len < rc->min_length[s->type-1]) {                  if (len < rc->min_length[s->type-1]) {
1146                          /* force frame size to our computed minimum */                          /* This is a 'forced size' frame, set its frame size to the
1147                             * computed minimum */
1148                          s->scaled_length = rc->min_length[s->type-1];                          s->scaled_length = rc->min_length[s->type-1];
1149    
1150                            /* Remove both scaled and original size from their respective
1151                             * total counters, as we prepare a second pass for 'regular'
1152                             * frames */
1153                          target -= s->scaled_length;                          target -= s->scaled_length;
1154                          pass1_length -= s->length;                          pass1_length -= s->length;
1155                  } else {                  } else {
# Line 935  Line 1158 
1158                  }                  }
1159          }          }
1160    
1161          /* Correct the scaler for all non forced frames */          /* The first pass on data substracted all 'forced size' frames from the
1162             * total counters. Now, it's possible to scale the 'regular' frames. */
1163    
1164            /* Scaling factor for 'regular' frames */
1165          scaler = (double)target / (double)pass1_length;          scaler = (double)target / (double)pass1_length;
1166    
1167          /* Detect undersizing */          /* Detect undersizing */
1168      if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {      if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {
1169                  DPRINTF(XVID_DEBUG_RC, "WARNING: Undersize detected\n");                  DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- WARNING: Undersize detected after correction\n");
1170                  scaler = 1.0;                  scaler = 1.0;
1171          }          }
1172    
         DPRINTF(XVID_DEBUG_RC,  
                         "After correction: target=%i, tot_length=%i, scaler=%f\n",  
                         (int)target, (int)pass1_length, scaler);  
   
1173          /* Do another pass with the new scaler */          /* Do another pass with the new scaler */
1174          for (i=0; i<rc->num_frames; i++) {          for (i=0; i<rc->num_frames; i++) {
1175                  stat_t * s = &rc->stats[i];                  twopass_stat_t * s = &rc->stats[i];
1176    
1177                  /* Ignore frame with forced frame sizes */                  /* Ignore frame with forced frame sizes */
1178                  if (s->scaled_length == 0)                  if (s->scaled_length == 0)
1179                          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);
1180          }          }
1181    
1182            /* Job done */
1183            return;
1184  }  }
1185    
1186    /* Apply all user settings to the scaled curve
1187     * This implies:
1188     *   keyframe boosting
1189     *   high/low compression */
1190  static void  static void
1191  pre_process1(rc_2pass2_t * rc)  scaled_curve_apply_advanced_parameters(rc_2pass2_t * rc)
1192  {  {
1193      int i;      int i;
     double total1, total2;  
1194      uint64_t ivop_boost_total;      uint64_t ivop_boost_total;
1195    
1196      ivop_boost_total = 0;          /* Reset the rate controller (per frame type) total byte counters */
1197      rc->curve_comp_error = 0;          for (i=0; i<3; i++) rc->tot_scaled_length[i] = 0;
1198    
1199      for (i=0; i<3; i++) {          /* Compute total bytes for each frame type */
1200          rc->tot_scaled_length[i] = 0;          for (i=0; i<rc->num_frames;i++) {
1201                    twopass_stat_t *s = &rc->stats[i];
1202                    rc->tot_scaled_length[s->type-1] += s->scaled_length;
1203      }      }
1204    
1205            /* First we compute the total amount of bits needed, as being described by
1206             * the scaled distribution. During this pass over the complete stats data,
1207             * we see how much bits two user settings will get/give from/to p&b frames:
1208             *  - keyframe boosting
1209             *  - keyframe distance penalty */
1210            rc->KF_idx = 0;
1211            ivop_boost_total = 0;
1212      for (i=0; i<rc->num_frames; i++) {      for (i=0; i<rc->num_frames; i++) {
1213          stat_t * s = &rc->stats[i];                  twopass_stat_t * s = &rc->stats[i];
   
         rc->tot_scaled_length[s->type-1] += s->scaled_length;  
1214    
1215                    /* Some more work is needed for I frames */
1216          if (s->type == XVID_TYPE_IVOP) {          if (s->type == XVID_TYPE_IVOP) {
1217              ivop_boost_total += s->scaled_length * rc->param.keyframe_boost / 100;                          int penalty_distance;
1218                            int ivop_boost;
1219    
1220                            /* Accumulate bytes needed for keyframe boosting */
1221                            ivop_boost = s->scaled_length*rc->param.keyframe_boost/100;
1222    
1223                            if (rc->KF_idx) {
1224                                    /* Minimum keyframe distance penalties */
1225                                    penalty_distance  = rc->param.min_key_interval;
1226                                    penalty_distance -= rc->keyframe_locations[rc->KF_idx];
1227                                    penalty_distance += rc->keyframe_locations[rc->KF_idx-1];
1228    
1229                                    /* Ah ah ! guilty keyframe, you're under arrest ! */
1230                                    if (penalty_distance > 0)
1231                                             ivop_boost -= (s->scaled_length + ivop_boost)*penalty_distance*rc->param.kfreduction/100;
1232                            }
1233    
1234                            /* If the frame size drops under the minimum length, then cap ivop_boost */
1235                            if (ivop_boost + s->scaled_length < rc->min_length[XVID_TYPE_IVOP-1])
1236                                    ivop_boost = rc->min_length[XVID_TYPE_IVOP-1] - s->scaled_length;
1237    
1238                            /* Accumulate the ivop boost */
1239                            ivop_boost_total += ivop_boost;
1240    
1241                            /* Don't forget to update the keyframe index */
1242                            rc->KF_idx++;
1243          }          }
1244      }      }
1245    
1246      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
1247                                          (rc->tot_scaled_length[XVID_TYPE_PVOP-1] + rc->tot_scaled_length[XVID_TYPE_BVOP-1]));           *
1248             * This ratio has to be applied to p/b/s frames in order to reserve
1249             * additional bits for keyframes (keyframe boosting) or if too much
1250             * keyframe distance is applied, bits retrieved from the keyframes.
1251             *
1252             * ie pb_length *= rc->pb_iboost_tax_ratio;
1253             *
1254             *    gives the ideal length of a p/b frame */
1255    
1256            /* Compute the total length of p/b/s frames (temporary storage into
1257             * movie_curve) */
1258            rc->pb_iboost_tax_ratio  = (double)rc->tot_scaled_length[XVID_TYPE_PVOP-1];
1259            rc->pb_iboost_tax_ratio += (double)rc->tot_scaled_length[XVID_TYPE_BVOP-1];
1260    
1261            /* Compute the ratio described above
1262             *     taxed_total = sum(0, n, tax*scaled_length)
1263             * <=> taxed_total = tax.sum(0, n, tax*scaled_length)
1264             * <=> tax = taxed_total / original_total */
1265            rc->pb_iboost_tax_ratio =
1266                    (rc->pb_iboost_tax_ratio - ivop_boost_total) /
1267                    rc->pb_iboost_tax_ratio;
1268    
1269            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- IFrame boost tax ratio:%.2f\n",
1270                            rc->pb_iboost_tax_ratio);
1271    
1272            /* Compute the average size of frames per frame type */
1273      for(i=0; i<3; i++) {      for(i=0; i<3; i++) {
1274          if (rc->count[i] == 0 || rc->movie_curve == 0) {                  /* Special case for missing type or weird case */
1275                    if (rc->count[i] == 0 || rc->pb_iboost_tax_ratio == 0) {
1276              rc->avg_length[i] = 1;              rc->avg_length[i] = 1;
1277          }else{          }else{
1278              rc->avg_length[i] = rc->tot_scaled_length[i] / rc->count[i] / rc->movie_curve;                          rc->avg_length[i] = rc->tot_scaled_length[i];
1279          }  
1280                            if (i == (XVID_TYPE_IVOP-1)) {
1281                                    /* I Frames total has to be added the boost total */
1282                                    rc->avg_length[i] += ivop_boost_total;
1283                            } else {
1284                                    /* P/B frames has to taxed */
1285                                    rc->avg_length[i] *= rc->pb_iboost_tax_ratio;
1286      }      }
1287    
1288      /* --- */                          /* Finally compute the average frame size */
1289                            rc->avg_length[i] /= (double)rc->count[i];
1290                    }
1291            }
1292    
1293      total1=total2=0;          /* Assymetric curve compression */
1294            if (rc->param.curve_compression_high || rc->param.curve_compression_low) {
1295                    double symetric_total;
1296                    double assymetric_delta_total;
1297    
1298                    /* Like I frame boosting, assymetric curve compression modifies the total
1299                     * amount of needed bits, we must compute the ratio so we can prescale
1300                     lengths */
1301                    symetric_total = 0;
1302                    assymetric_delta_total = 0;
1303      for (i=0; i<rc->num_frames; i++) {      for (i=0; i<rc->num_frames; i++) {
1304          stat_t * s = &rc->stats[i];                          double assymetric_delta;
1305                            double dbytes;
1306                            twopass_stat_t * s = &rc->stats[i];
1307    
1308          if (s->type != XVID_TYPE_IVOP) {                          /* I Frames are not concerned by assymetric scaling */
1309              double dbytes,dbytes2;                          if (s->type == XVID_TYPE_IVOP)
1310                                    continue;
1311    
1312              dbytes = s->scaled_length / rc->movie_curve;                          /* During the real run, we would have to apply the iboost tax */
1313              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];  
1314    
1315                          if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                          /* Update the symmetric curve compression total */
1316                                  dbytes2=((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_high / 100.0);                          symetric_total += dbytes;
1317    
1318                            /* Apply assymetric curve compression */
1319                            if (dbytes > rc->avg_length[s->type-1])
1320                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * (double)rc->param.curve_compression_high / 100.0f;
1321                            else
1322                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * (double)rc->param.curve_compression_low  / 100.0f;
1323    
1324                            /* Cap to the minimum frame size if needed */
1325                            if (dbytes + assymetric_delta < rc->min_length[s->type-1])
1326                                    assymetric_delta = rc->min_length[s->type-1] - dbytes;
1327    
1328                            /* Accumulate after assymetric curve compression */
1329                            assymetric_delta_total += assymetric_delta;
1330                    }
1331    
1332                    /* Compute the tax that all p/b frames have to pay in order to respect the
1333                     * bit distribution changes that the assymetric compression curve imposes
1334                     * We want assymetric_total = sum(0, n-1, tax.scaled_length)
1335                     *      ie assymetric_total = ratio.sum(0, n-1, scaled_length)
1336                     *         ratio = assymetric_total / symmetric_total */
1337                    rc->assymetric_tax_ratio = ((double)symetric_total - (double)assymetric_delta_total) / (double)symetric_total;
1338                          } else {                          } else {
1339                                  dbytes2 = ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_low / 100.0);                  rc->assymetric_tax_ratio = 1.0f;
1340                          }                          }
1341    
1342              if (s->type == XVID_TYPE_BVOP) {          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Assymetric tax ratio:%.2f\n", rc->assymetric_tax_ratio);
1343                              dbytes2 *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
1344                              if (dbytes2 < rc->min_length[XVID_TYPE_BVOP-1])          /* Last bits that need to be reset */
1345                                      dbytes2 = rc->min_length[XVID_TYPE_BVOP-1];          rc->overflow = 0;
1346              }else{          rc->KFoverflow = 0;
1347                              if (dbytes2 < rc->min_length[XVID_TYPE_PVOP-1])          rc->KFoverflow_partial = 0;
1348                                      dbytes2 = rc->min_length[XVID_TYPE_PVOP-1];          rc->KF_idx = 0;
1349            rc->desired_total = 0;
1350            rc->real_total = 0;
1351    
1352            /* Job done */
1353            return;
1354              }              }
1355              total2 += dbytes2;  
1356    /*****************************************************************************
1357     * Still more low level stuff (nothing to do with stats treatment)
1358     ****************************************************************************/
1359    
1360    /* This function returns an allocated string containing a complete line read
1361     * from the file starting at the current position */
1362    static char *
1363    readline(FILE *f)
1364    {
1365            char *buffer = NULL;
1366            int buffer_size = 0;
1367            int pos = 0;
1368    
1369            do {
1370                    int c;
1371    
1372                    /* Read a character from the stream */
1373                    c = fgetc(f);
1374    
1375                    /* Is that EOF or new line ? */
1376                    if(c == EOF || c == '\n')
1377                            break;
1378    
1379                    /* Do we have to update buffer ? */
1380                    if(pos >= buffer_size - 1) {
1381                            buffer_size += BUF_SZ;
1382                            buffer = (char*)realloc(buffer, buffer_size);
1383                            if (buffer == NULL)
1384                                    return(NULL);
1385          }          }
1386    
1387                    buffer[pos] = c;
1388                    pos++;
1389            } while(1);
1390    
1391            /* Read \n or EOF */
1392            if (buffer == NULL) {
1393                    /* EOF, so we reached the end of the file, return NULL */
1394                    if(feof(f))
1395                            return(NULL);
1396    
1397                    /* Just an empty line with just a newline, allocate a 1 byte buffer to
1398                     * store a zero length string */
1399                    buffer = (char*)malloc(1);
1400                    if(buffer == NULL)
1401                            return(NULL);
1402      }      }
1403    
1404      rc->curve_comp_scale = total1 / total2;          /* Zero terminated string */
1405            buffer[pos] = '\0';
1406    
1407          DPRINTF(XVID_DEBUG_RC, "middle frame size for asymmetric curve compression: %i\n",          return(buffer);
1408              (int)(rc->avg_length[XVID_TYPE_PVOP-1] * rc->curve_comp_scale));  }
1409    
1410      rc->overflow = 0;  /* This function returns a pointer to the first non space char in the given
1411      rc->KFoverflow = 0;   * string */
1412      rc->KFoverflow_partial = 0;  static char *
1413      rc->KF_idx = 1;  skipspaces(char *string)
1414    {
1415            const char spaces[] =
1416                    {
1417                            ' ','\t','\0'
1418                    };
1419            const char *spacechar = spaces;
1420    
1421            if (string == NULL) return(NULL);
1422    
1423            while (*string != '\0') {
1424                    /* Test against space chars */
1425                    while (*spacechar != '\0') {
1426                            if (*string == *spacechar) {
1427                                    string++;
1428                                    spacechar = spaces;
1429                                    break;
1430                            }
1431                            spacechar++;
1432                    }
1433    
1434                    /* No space char */
1435                    if (*spacechar == '\0') return(string);
1436            }
1437    
1438            return(string);
1439    }
1440    
1441    /* This function returns a boolean that tells if the string is only a
1442     * comment */
1443    static int
1444    iscomment(char *string)
1445    {
1446            const char comments[] =
1447                    {
1448                            '#',';', '%', '\0'
1449                    };
1450            const char *cmtchar = comments;
1451            int iscomment = 0;
1452    
1453            if (string == NULL) return(1);
1454    
1455            string = skipspaces(string);
1456    
1457            while(*cmtchar != '\0') {
1458                    if(*string == *cmtchar) {
1459                            iscomment = 1;
1460                            break;
1461  }  }
1462                    cmtchar++;
1463            }
1464    
1465            return(iscomment);
1466    }
1467    
1468    #if 0
1469    static void
1470    stats_print(rc_2pass2_t * rc)
1471    {
1472            int i;
1473            const char frame_type[4] = { 'i', 'p', 'b', 's'};
1474    
1475            for (i=0; i<rc->num_frames; i++) {
1476                    twopass_stat_t *s = &rc->stats[i];
1477                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- frame:%d type:%c quant:%d stats:%d scaled:%d desired:%d actual:%d overflow(%c):%.2f\n",
1478                                    i, frame_type[s->type-1], -1, s->length, s->scaled_length,
1479                                    s->desired_length, -1, frame_type[s->type-1], -1.0f);
1480            }
1481    }
1482    #endif
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