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revision 1048, Thu May 29 11:37:20 2003 UTC revision 1293, Sun Dec 21 12:41:48 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 1.1.2.15 2003-05-29 11:37:20 edgomez Exp $   * $Id: plugin_2pass2.c,v 1.1.2.32 2003-12-21 12:41:48 syskin Exp $
29   *   *
30   *****************************************************************************/   *****************************************************************************/
31    
32    #define BQUANT_PRESCALE
33    #undef COMPENSATE_FORMULA
34    
35    /* forces second pass not to be bigger than first */
36    #undef PASS_SMALLER
37    
38  #include <stdio.h>  #include <stdio.h>
39  #include <math.h>  #include <math.h>
40  #include <limits.h>  #include <limits.h>
# Line 37  Line 43 
43  #include "../image/image.h"  #include "../image/image.h"
44    
45  /*****************************************************************************  /*****************************************************************************
46   * Some constants   * Some default settings
47   ****************************************************************************/   ****************************************************************************/
48    
49  #define DEFAULT_KEYFRAME_BOOST 0  #define DEFAULT_KEYFRAME_BOOST 0
50  #define DEFAULT_PAYBACK_METHOD XVID_PAYBACK_PROP  #define DEFAULT_OVERFLOW_CONTROL_STRENGTH 10
 #define DEFAULT_BITRATE_PAYBACK_DELAY 250  
51  #define DEFAULT_CURVE_COMPRESSION_HIGH 0  #define DEFAULT_CURVE_COMPRESSION_HIGH 0
52  #define DEFAULT_CURVE_COMPRESSION_LOW 0  #define DEFAULT_CURVE_COMPRESSION_LOW 0
53  #define DEFAULT_MAX_OVERFLOW_IMPROVEMENT 60  #define DEFAULT_MAX_OVERFLOW_IMPROVEMENT 10
54  #define DEFAULT_MAX_OVERFLOW_DEGRADATION 60  #define DEFAULT_MAX_OVERFLOW_DEGRADATION 10
55    
56  /* Keyframe settings */  /* Keyframe settings */
 #define DEFAULT_KFTRESHOLD 10  
57  #define DEFAULT_KFREDUCTION 20  #define DEFAULT_KFREDUCTION 20
58  #define DEFAULT_MIN_KEY_INTERVAL 1  #define DEFAULT_KFTHRESHOLD 1
59    
60    /*****************************************************************************
61     * Some default constants (can be tuned)
62     ****************************************************************************/
63    
64    /* Specify the invariant part of the headers bits (header+MV)
65     * as  hlength/cst */
66    #define INVARIANT_HEADER_PART_IVOP 1 /* factor 1.0f   */
67    #define INVARIANT_HEADER_PART_PVOP 2 /* factor 0.5f   */
68    #define INVARIANT_HEADER_PART_BVOP 8 /* factor 0.125f */
69    
70  /*****************************************************************************  /*****************************************************************************
71   * Structures   * Structures
# Line 63  Line 77 
77      int quant;              /* first pass quant */      int quant;              /* first pass quant */
78          int blks[3];                    /* k,m,y blks */          int blks[3];                    /* k,m,y blks */
79      int length;             /* first pass length */      int length;             /* first pass length */
80            int invariant;          /* what we assume as being invariant between the two passes, it's a sub part of header + MV bits */
81      int scaled_length;      /* scaled length */      int scaled_length;      /* scaled length */
82      int desired_length;     /* desired length; calcuated during encoding */          int desired_length;     /* desired length; calculated during encoding */
83            int error;
84    
85      int zone_mode;   /* XVID_ZONE_xxx */      int zone_mode;   /* XVID_ZONE_xxx */
86      double weight;      double weight;
87  } stat_t;  } twopass_stat_t;
88    
89  /* Context struct */  /* Context struct */
90  typedef struct  typedef struct
91  {  {
92      xvid_plugin_2pass2_t param;      xvid_plugin_2pass2_t param;
93    
94      /* constant statistical data */          /*----------------------------------
95          int num_frames;           * constant statistical data
96          int num_keyframes;           *--------------------------------*/
         uint64_t target;        /* target filesize */  
97    
98          int count[3];   /* count of each frame types */          /* Number of frames of the sequence */
99          uint64_t tot_length[3];  /* total length of each frame types */          int num_frames;
         double avg_length[3];   /* avg */  
         int min_length[3];  /* min frame length of each frame types */  
         uint64_t tot_scaled_length[3];  /* total scaled length of each frame type */  
         int max_length;     /* max frame size */  
100    
101          /* zone statistical data */          /* Number of Intra frames of the sequence */
102          double avg_weight;  /* average weight */          int num_keyframes;
         int64_t tot_quant;   /* total length used by XVID_ZONE_QUANT zones */  
103    
104            /* Target filesize to reach */
105            uint64_t target;
106    
107          double curve_comp_scale;          /* Count of each frame types */
108          double movie_curve;          int count[3];
109    
110          /* dynamic */          /* Total length of each frame types (1st pass) */
111            uint64_t tot_length[3];
112            uint64_t tot_invariant[3];
113    
114            /* Average length of each frame types (used first for 1st pass data and
115             * then for scaled averages */
116            double avg_length[3];
117    
118            /* Minimum frame length allowed for each frame type */
119            int min_length[3];
120    
121            /* Total bytes per frame type once the curve has been scaled
122             * NB: advanced parameters do not change this value. This field
123             *     represents the total scaled w/o any advanced settings */
124            uint64_t tot_scaled_length[3];
125    
126            /* Maximum observed frame size observed during the first pass, the RC
127             * will try tp force all frame sizes in the second pass to be under that
128             * limit */
129            int max_length;
130    
131            /*----------------------------------
132             * Zones statistical data
133             *
134             * ToDo: Fix zones, current
135             *       implementation is buggy
136             *--------------------------------*/
137    
138            /* Average weight of the zones */
139            double avg_weight;
140    
141            /* Total length used by XVID_ZONE_QUANT zones */
142            uint64_t tot_quant;
143            uint64_t tot_quant_invariant;
144    
145            /*----------------------------------
146             * Advanced settings helper ratios
147             *--------------------------------*/
148    
149            /* This the ratio that has to be applied to all p/b frames in order
150             * to reserve/retrieve bits for/from keyframe boosting and consecutive
151             * keyframe penalty */
152            double pb_iboost_tax_ratio;
153    
154            /* This the ratio to apply to all b/p frames in order to respect the
155             * assymetric curve compression while respecting a target filesize
156             * NB: The assymetric delta gain has to be computed before this ratio
157             *     is applied, and then the delta is added to the scaled size */
158            double assymetric_tax_ratio;
159    
160            /*----------------------------------
161             * Data from the stats file kept
162             * into RAM for easy access
163             *--------------------------------*/
164    
165            /* Array of keyframe locations
166             * eg: rc->keyframe_locations[100] returns the frame number of the 100th
167             *     keyframe */
168          int * keyframe_locations;          int * keyframe_locations;
         stat_t * stats;  
169    
170            /* Index of the last keyframe used in the keyframe_location */
171            int KF_idx;
172    
173            /* Array of all 1st pass data file -- see the twopass_stat_t structure
174             * definition for more details */
175            twopass_stat_t * stats;
176    
177            /*----------------------------------
178             * Histerysis helpers
179             *--------------------------------*/
180    
181            /* This field holds the int2float conversion errors of each quant per
182             * frame type, this allow the RC to keep track of rouding error and thus
183             * increase or decrease the chosen quant according to this residue */
184          double quant_error[3][32];          double quant_error[3][32];
185          int quant_count[32];  
186            /* This fields stores the count of each quant usage per frame type
187             * No real role but for debugging */
188            int quant_count[3][32];
189    
190            /* Last valid quantizer used per frame type, it allows quantizer
191             * increament/decreament limitation in order to avoid big image quality
192             * "jumps" */
193          int last_quant[3];          int last_quant[3];
194    
195          double curve_comp_error;          /*----------------------------------
196          int overflow;           * Overflow control
197          int KFoverflow;           *--------------------------------*/
198          int KFoverflow_partial;  
199          int KF_idx;          /* Current overflow that has to be distributed to p/b frames */
200            double overflow;
201    
202            /* Total overflow for keyframes -- not distributed directly */
203            double KFoverflow;
204    
205            /* Amount of keyframe overflow to introduce to the global p/b frame
206             * overflow counter at each encoded frame */
207            double KFoverflow_partial;
208    
209            /* Unknown ???
210             * ToDo: description */
211          double fq_error;          double fq_error;
212    
213            /*----------------------------------
214             * Debug
215             *--------------------------------*/
216            double desired_total;
217            double real_total;
218  } rc_2pass2_t;  } rc_2pass2_t;
219    
220    
# Line 132  Line 236 
236  {  {
237      switch(opt) {      switch(opt) {
238      case XVID_PLG_INFO :      case XVID_PLG_INFO :
239            case XVID_PLG_FRAME :
240          return 0;          return 0;
241    
242      case XVID_PLG_CREATE :      case XVID_PLG_CREATE :
# Line 155  Line 260 
260   ****************************************************************************/   ****************************************************************************/
261    
262  /* First a few local helping function prototypes */  /* First a few local helping function prototypes */
263  static  int det_stats_length(rc_2pass2_t * rc, char * filename);  static  int statsfile_count_frames(rc_2pass2_t * rc, char * filename);
264  static  int load_stats(rc_2pass2_t *rc, char * filename);  static  int statsfile_load(rc_2pass2_t *rc, char * filename);
265  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);
266  static void internal_scale(rc_2pass2_t *rc);  static void first_pass_stats_prepare_data(rc_2pass2_t * rc);
267  static void pre_process0(rc_2pass2_t * rc);  static void first_pass_scale_curve_internal(rc_2pass2_t *rc);
268  static void pre_process1(rc_2pass2_t * rc);  static void scaled_curve_apply_advanced_parameters(rc_2pass2_t * rc);
269    #if 0
270    static void stats_print(rc_2pass2_t * rc);
271    #endif
272    
273  /*----------------------------------------------------------------------------  /*----------------------------------------------------------------------------
274   *--------------------------------------------------------------------------*/   *--------------------------------------------------------------------------*/
# Line 178  Line 286 
286    
287      rc->param = *param;      rc->param = *param;
288    
289          /*          /* Initialize all defaults */
          * Initialize all defaults  
          */  
290  #define _INIT(a, b) if((a) <= 0) (a) = (b)  #define _INIT(a, b) if((a) <= 0) (a) = (b)
291      /* Let's set our defaults if needed */      /* Let's set our defaults if needed */
292          _INIT(rc->param.keyframe_boost, DEFAULT_KEYFRAME_BOOST);          _INIT(rc->param.keyframe_boost, DEFAULT_KEYFRAME_BOOST);
293          _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);  
294      _INIT(rc->param.curve_compression_high, DEFAULT_CURVE_COMPRESSION_HIGH);      _INIT(rc->param.curve_compression_high, DEFAULT_CURVE_COMPRESSION_HIGH);
295      _INIT(rc->param.curve_compression_low, DEFAULT_CURVE_COMPRESSION_LOW);      _INIT(rc->param.curve_compression_low, DEFAULT_CURVE_COMPRESSION_LOW);
296      _INIT(rc->param.max_overflow_improvement, DEFAULT_MAX_OVERFLOW_IMPROVEMENT);      _INIT(rc->param.max_overflow_improvement, DEFAULT_MAX_OVERFLOW_IMPROVEMENT);
297      _INIT(rc->param.max_overflow_degradation,  DEFAULT_MAX_OVERFLOW_DEGRADATION);      _INIT(rc->param.max_overflow_degradation,  DEFAULT_MAX_OVERFLOW_DEGRADATION);
298    
299      /* Keyframe settings */      /* Keyframe settings */
         _INIT(rc->param.kftreshold, DEFAULT_KFTRESHOLD);  
300      _INIT(rc->param.kfreduction, DEFAULT_KFREDUCTION);      _INIT(rc->param.kfreduction, DEFAULT_KFREDUCTION);
301      _INIT(rc->param.min_key_interval, DEFAULT_MIN_KEY_INTERVAL);          _INIT(rc->param.kfthreshold, DEFAULT_KFTHRESHOLD);
302  #undef _INIT  #undef _INIT
303    
304          /* Initialize some stuff to zero */          /* Initialize some stuff to zero */
         for(i=0; i<32; i++) rc->quant_count[i] = 0;  
   
305          for(i=0; i<3; i++) {          for(i=0; i<3; i++) {
306                  int j;                  int j;
307                  for (j=0; j<32; j++)                  for (j=0; j<32; j++) {
308                          rc->quant_error[i][j] = 0;                          rc->quant_error[i][j] = 0;
309                            rc->quant_count[i][j] = 0;
310                    }
311          }          }
312    
313          for (i=0; i<3; i++)          for (i=0; i<3; i++) rc->last_quant[i] = 0;
                 rc->last_quant[i] = 0;  
314    
315          rc->fq_error = 0;          rc->fq_error = 0;
316    
317          /* Count frames in the stats file */          /* Count frames (and intra frames) in the stats file, store the result into
318          if (!det_stats_length(rc, param->filename)) {           * the rc structure */
319                  DPRINTF(XVID_DEBUG_RC,"ERROR: fopen %s failed\n", param->filename);          if (statsfile_count_frames(rc, param->filename) == -1) {
320                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- ERROR: fopen %s failed\n", param->filename);
321                  free(rc);                  free(rc);
322                  return XVID_ERR_FAIL;                  return(XVID_ERR_FAIL);
323          }          }
324    
325      /* Allocate the stats' memory */      /* Allocate the stats' memory */
326          if ((rc->stats = malloc(rc->num_frames * sizeof(stat_t))) == NULL) {          if ((rc->stats = malloc(rc->num_frames * sizeof(twopass_stat_t))) == NULL) {
327          free(rc);          free(rc);
328          return XVID_ERR_MEMORY;                  return(XVID_ERR_MEMORY);
329      }      }
330    
331      /*          /* Allocate keyframes location's memory
332           * 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  
          */  
333          rc->keyframe_locations = malloc((rc->num_keyframes + 1) * sizeof(int));          rc->keyframe_locations = malloc((rc->num_keyframes + 1) * sizeof(int));
334          if (rc->keyframe_locations == NULL) {          if (rc->keyframe_locations == NULL) {
335                  free(rc->stats);                  free(rc->stats);
336                  free(rc);                  free(rc);
337                  return XVID_ERR_MEMORY;                  return(XVID_ERR_MEMORY);
338          }          }
339    
340          if (!load_stats(rc, param->filename)) {          /* Load the first pass stats */
341                  DPRINTF(XVID_DEBUG_RC,"ERROR: fopen %s failed\n", param->filename);          if (statsfile_load(rc, param->filename) == -1) {
342                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- ERROR: fopen %s failed\n", param->filename);
343                  free(rc->keyframe_locations);                  free(rc->keyframe_locations);
344                  free(rc->stats);                  free(rc->stats);
345                  free(rc);                  free(rc);
# Line 244  Line 347 
347          }          }
348    
349          /* Compute the target filesize */          /* Compute the target filesize */
350          if (rc->num_frames  < create->fbase/create->fincr) {          if (rc->param.bitrate<0) {
351                    /* if negative, bitrate equals the target (in kbytes) */
352                    rc->target = ((uint64_t)(-rc->param.bitrate)) * 1024;
353            } else if (rc->num_frames  < create->fbase/create->fincr) {
354                  /* 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 */
355                  rc->target = rc->param.bitrate / 8;                  rc->target = rc->param.bitrate / 8;
356          } else {          } else {
# Line 255  Line 361 
361                          ((uint64_t)create->fbase * 8);                          ((uint64_t)create->fbase * 8);
362          }          }
363    
364          DPRINTF(XVID_DEBUG_RC, "Frame rate: %d/%d (%ffps)\n",          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Frame rate: %d/%d (%ffps)\n",
365                          create->fbase, create->fincr,                          create->fbase, create->fincr,
366                          (double)create->fbase/(double)create->fincr);                          (double)create->fbase/(double)create->fincr);
367          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);
368          DPRINTF(XVID_DEBUG_RC, "Target bitrate: %ld\n", rc->param.bitrate);          if(rc->param.bitrate>=0)
369          DPRINTF(XVID_DEBUG_RC, "Target filesize: %lld\n", rc->target);                  DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Target bitrate: %ld\n", rc->param.bitrate);
370            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Target filesize: %lld\n", rc->target);
371    
372          /* Compensate the average frame overhead caused by the container */          /* Compensate the average frame overhead caused by the container */
373          rc->target -= rc->num_frames*rc->param.container_frame_overhead;          rc->target -= rc->num_frames*rc->param.container_frame_overhead;
374          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);
375          DPRINTF(XVID_DEBUG_RC, "Target filesize (after container compensation): %lld\n", rc->target);          if(rc->param.container_frame_overhead)
376                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- New target filesize after container compensation: %lld\n", rc->target);
377    
378          /*          /* Gathers some information about first pass stats:
          * First data pre processing:  
379           *  - finds the minimum frame length for each frame type during 1st pass.           *  - finds the minimum frame length for each frame type during 1st pass.
380           *     rc->min_size[]           *     rc->min_size[]
381           *  - determines the maximum frame length observed (no frame type distinction).           *  - determines the maximum frame length observed (no frame type distinction).
# Line 276  Line 383 
383           *  - count how many times each frame type has been used.           *  - count how many times each frame type has been used.
384           *     rc->count[]           *     rc->count[]
385           *  - total bytes used per frame type           *  - total bytes used per frame type
386           *     rc->total[]           *     rc->tot_length[]
387             *  - total bytes considered invariant between the 2 passes
388           *  - store keyframe location           *  - store keyframe location
389           *     rc->keyframe_locations[]           *     rc->keyframe_locations[]
390           */           */
391          pre_process0(rc);          first_pass_stats_prepare_data(rc);
392    
393          /*          /* When bitrate is not given it means it has been scaled by an external
394           * When bitrate is not given it means it has been scaled by an external           * application */
          * application  
          */  
395          if (rc->param.bitrate) {          if (rc->param.bitrate) {
396                  /* Apply zone settings */                  /* Apply zone settings
397                     * - set rc->tot_quant which represents the total num of bytes spent in
398                     *   fixed quant zones
399                     * - set rc->tot_quant_invariant which represents the total num of bytes spent
400                     *   in fixed quant zones for headers */
401                  zone_process(rc, create);                  zone_process(rc, create);
402                  /* Perform curve scaling */                  /* Perform internal curve scaling */
403                  internal_scale(rc);                  first_pass_scale_curve_internal(rc);
404          } else {          } else {
405                  /* External scaling -- zones are ignored */                  /* External scaling -- zones are ignored */
406                  for (i=0;i<rc->num_frames;i++) {                  for (i=0;i<rc->num_frames;i++) {
# Line 301  Line 411 
411                  rc->tot_quant = 0;                  rc->tot_quant = 0;
412          }          }
413    
414          pre_process1(rc);          /* Apply advanced curve options, and compute some parameters in order to
415             * shape the curve in the BEFORE/AFTER pair of functions */
416            scaled_curve_apply_advanced_parameters(rc);
417    
418          *handle = rc;          *handle = rc;
419          return(0);          return(0);
# Line 313  Line 425 
425  static int  static int
426  rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy)  rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy)
427  {  {
428            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- target_total:%lld desired_total:%.2f (%.2f%%) actual_total:%.2f (%.2f%%)\n",
429                            rc->target,
430                            rc->desired_total,
431                            100*rc->desired_total/(double)rc->target,
432                            rc->real_total,
433                            100*rc->real_total/(double)rc->target);
434    
435      free(rc->keyframe_locations);      free(rc->keyframe_locations);
436      free(rc->stats);      free(rc->stats);
437          free(rc);          free(rc);
# Line 325  Line 444 
444  static int  static int
445  rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)  rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)
446  {  {
447          stat_t * s = &rc->stats[data->frame_num];          twopass_stat_t * s = &rc->stats[data->frame_num];
         int overflow;  
         int desired;  
448          double dbytes;          double dbytes;
         double curve_temp;  
449          double scaled_quant;          double scaled_quant;
450            double overflow;
451          int capped_to_max_framesize = 0;          int capped_to_max_framesize = 0;
452    
453          /*          /* This function is quite long but easy to understand. In order to simplify
454           * 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.  
          */  
455    
456          /* First case: Another plugin has already set a quantizer */          /* First case: Another plugin has already set a quantizer */
457      if (data->quant > 0)      if (data->quant > 0)
458                  return(0);                  return(0);
459    
460          /* Second case: We are in a Quant zone */          /* Second case: insufficent stats data */
461            if (data->frame_num >= rc->num_frames) {
462                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- stats file too short (now processing frame %d)",
463                            data->frame_num);
464                    return(0);
465            }
466    
467            /* Third case: We are in a Quant zone */
468          if (s->zone_mode == XVID_ZONE_QUANT) {          if (s->zone_mode == XVID_ZONE_QUANT) {
469                  rc->fq_error += s->weight;                  rc->fq_error += s->weight;
470                  data->quant = (int)rc->fq_error;                  data->quant = (int)rc->fq_error;
# Line 353  Line 475 
475                  return(0);                  return(0);
476          }          }
477    
         /* Third case: insufficent stats data */  
         if (data->frame_num >= rc->num_frames)  
                 return 0;  
   
         /*  
          * The last case is the one every normal minded developer should fear to  
          * maintain in a project :-)  
          */  
   
         /* XXX: why by 8 */  
         overflow = rc->overflow / 8;  
478    
479          /*          /*************************************************************************/
480           * The rc->overflow field represents the overflow in current scene (between two          /*************************************************************************/
481           * IFrames) so we must not forget to reset it if we are entering a new scene          /*************************************************************************/
          */  
         if (s->type == XVID_TYPE_IVOP)  
                 overflow = 0;  
482    
483          desired = s->scaled_length;          /*-------------------------------------------------------------------------
484             * Frame bit allocation first part
485             *
486             * First steps apply user settings, just like it is done in the theoritical
487             * scaled_curve_apply_advanced_parameters
488             *-----------------------------------------------------------------------*/
489    
490          dbytes = desired;          /* Set desired to what we are wanting to obtain for this frame */
491          if (s->type == XVID_TYPE_IVOP)          dbytes = (double)s->scaled_length;
                 dbytes += desired * rc->param.keyframe_boost / 100;  
         dbytes /= rc->movie_curve;  
492    
493          /*          /* IFrame user settings*/
494           * We are now entering in the hard part of the algo, it was first designed          if (s->type == XVID_TYPE_IVOP) {
495           * to work with i/pframes only streams, so the way it computes things is                  /* Keyframe boosting -- All keyframes benefit from it */
496           * adapted to pframes only. However we can use it if we just take care to                  dbytes += dbytes*rc->param.keyframe_boost / 100;
          * scale the bframes sizes to pframes sizes using the ratio avg_p/avg_p and  
          * then before really using values depending on frame sizes, scaling the  
          * value again with the inverse ratio  
          */  
         if (s->type == XVID_TYPE_BVOP)  
                 dbytes *= rc->avg_length[XVID_TYPE_PVOP-1] / rc->avg_length[XVID_TYPE_BVOP-1];  
497    
498          /*  #if 0 /* ToDo: decide how to apply kfthresholding */
499           * Apply user's choosen Payback method. Payback helps bitrate to follow the  #endif
          * scaled curve "paying back" past errors in curve previsions.  
          */  
         if (rc->param.payback_method == XVID_PAYBACK_BIAS) {  
                 desired = (int)(rc->curve_comp_error / rc->param.bitrate_payback_delay);  
500          } else {          } else {
                 desired = (int)(rc->curve_comp_error * dbytes /  
                                                 rc->avg_length[XVID_TYPE_PVOP-1] / rc->param.bitrate_payback_delay);  
501    
502                  if (labs(desired) > fabs(rc->curve_comp_error)) {                  /* P/S/B frames must reserve some bits for iframe boosting */
503                          desired = (int)rc->curve_comp_error;                  dbytes *= rc->pb_iboost_tax_ratio;
504    
505                    /* Apply assymetric curve compression */
506                    if (rc->param.curve_compression_high || rc->param.curve_compression_low) {
507                            double assymetric_delta;
508    
509                            /* Compute the assymetric delta, this is computed before applying
510                             * the tax, as done in the pre_process function */
511                            if (dbytes > rc->avg_length[s->type-1])
512                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_high / 100.0;
513                            else
514                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_low  / 100.0;
515    
516                            /* Now we must apply the assymetric tax, else our curve compression
517                             * would not give a theoritical target size equal to what it is
518                             * expected */
519                            dbytes *= rc->assymetric_tax_ratio;
520    
521                            /* Now we can add the assymetric delta */
522                            dbytes += assymetric_delta;
523                  }                  }
524          }          }
525    
526          rc->curve_comp_error -= desired;          /* That is what we would like to have -- Don't put that chunk after
527             * overflow control, otherwise, overflow is counted twice and you obtain
528             * half sized bitrate sequences */
529            s->desired_length  = (int)dbytes;
530            rc->desired_total += dbytes;
531    
532          /* XXX: warning */          /*------------------------------------------------------------------------
533          curve_temp = 0;           * Frame bit allocation: overflow control part.
534             *
535             * Unlike the theoritical scaled_curve_apply_advanced_parameters, here
536             * it's real encoding and we need to make sure we don't go so far from
537             * what is our ideal scaled curve.
538             *-----------------------------------------------------------------------*/
539    
540            /* Compute the overflow we should compensate */
541            if (s->type != XVID_TYPE_IVOP || rc->overflow > 0) {
542                    double frametype_factor;
543                    double framesize_factor;
544    
545          if ((rc->param.curve_compression_high + rc->param.curve_compression_low) &&     s->type != XVID_TYPE_IVOP) {                  /* Take only the desired part of overflow */
546                    overflow = rc->overflow;
547    
548                  curve_temp = rc->curve_comp_scale;                  /* Factor that will take care to decrease the overflow applied
549                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                   * according to the importance of this frame type in term of
550                          curve_temp *= ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_high / 100.0);                   * overall size */
551                  } else {                  frametype_factor  = rc->count[XVID_TYPE_IVOP-1]*rc->avg_length[XVID_TYPE_IVOP-1];
552                          curve_temp *= ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_low / 100.0);                  frametype_factor += rc->count[XVID_TYPE_PVOP-1]*rc->avg_length[XVID_TYPE_PVOP-1];
553                  }                  frametype_factor += rc->count[XVID_TYPE_BVOP-1]*rc->avg_length[XVID_TYPE_BVOP-1];
554                    frametype_factor /= rc->count[s->type-1]*rc->avg_length[s->type-1];
555                    frametype_factor  = 1/frametype_factor;
556    
557                    /* Factor that will take care not to compensate too much for this frame
558                     * size */
559                    framesize_factor  = dbytes;
560                    framesize_factor /= rc->avg_length[s->type-1];
561    
562                  /*                  /* Treat only the overflow part concerned by this frame type and size */
563                   * End of code path for curve_temp, as told earlier, we are now                  overflow *= frametype_factor;
564                   * obliged to scale the value to a bframe one using the inverse  #if 0
565                   * ratio applied earlier                  /* Leave this one alone, as it impacts badly on quality */
566                   */                  overflow *= framesize_factor;
567                  if (s->type == XVID_TYPE_BVOP)  #endif
                         curve_temp *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
568    
569                  desired += (int)curve_temp;                  /* Apply the overflow strength imposed by the user */
570                  rc->curve_comp_error += curve_temp - (int)curve_temp;                  overflow *= (rc->param.overflow_control_strength/100.0f);
571          } else {          } else {
572                  /*                  /* no negative overflow applied in IFrames because:
573                   * End of code path for dbytes, as told earlier, we are now                   *  - their role is important as they're references for P/BFrames.
574                   * obliged to scale the value to a bframe one using the inverse                   *  - there aren't much in typical sequences, so if an IFrame overflows too
575                   * ratio applied earlier                   *    much, this overflow may impact the next IFrame too much and generate
576                   */                   *    a sequence of poor quality frames */
577                  if (s->type == XVID_TYPE_BVOP)                  overflow = 0;
                         dbytes *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
   
                 desired += (int)dbytes;  
                 rc->curve_comp_error += dbytes - (int)dbytes;  
578          }          }
579    
580            /* Make sure we are not trying to compensate more overflow than we even have */
581            if (fabs(overflow) > fabs(rc->overflow))
582                    overflow = rc->overflow;
583    
584          /*          /* Make sure the overflow doesn't make the frame size to get out of the range
585           * We can't do bigger frames than first pass, this would be stupid as first           * [-max_degradation..+max_improvment] */
586           * 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) {
587           * many bytes and we would not not gain much quality.                  if(overflow <= dbytes)
588           */                          dbytes += dbytes * rc->param.max_overflow_improvement / 100;
589          if (desired > s->length) {                  else
590                  rc->curve_comp_error += desired - s->length;                          dbytes += overflow * rc->param.max_overflow_improvement / 100;
591                  desired = s->length;          } else if (overflow < - dbytes * rc->param.max_overflow_degradation / 100) {
592                    dbytes -= dbytes * rc->param.max_overflow_degradation / 100;
593          } else {          } else {
594                  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];  
                 }  
595          }          }
596    
597          s->desired_length = desired;          /*-------------------------------------------------------------------------
598             * Frame bit allocation last part:
599             *
600          /*           * Cap frame length so we don't reach neither bigger frame sizes than first
601           * if this keyframe is too close to the next, reduce it's byte allotment           * pass nor smaller than the allowed minimum.
602           * XXX: why do we do this after setting the desired length ?           *-----------------------------------------------------------------------*/
603           */  
604    #ifdef PASS_SMALLER
605          if (s->type == XVID_TYPE_IVOP) {          if (dbytes > s->length) {
606                  int KFdistance = rc->keyframe_locations[rc->KF_idx] - rc->keyframe_locations[rc->KF_idx - 1];                  dbytes = s->length;
607            } else
608                  if (KFdistance < rc->param.kftreshold) {  #endif
609                    if (dbytes < rc->min_length[s->type-1]) {
610                          KFdistance -= rc->param.min_key_interval;                  dbytes = rc->min_length[s->type-1];
611            } else if (dbytes > rc->max_length) {
612                    /* ToDo: this condition is always wrong as max_length == maximum frame
613                     * length of first pass, so the first condition already caps the frame
614                     * size... */
615                    capped_to_max_framesize = 1;
616                    dbytes = rc->max_length;
617                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- frame:%d Capped to maximum frame size\n",
618                                    data->frame_num);
619            }
620    
621                          if (KFdistance >= 0) {          /*------------------------------------------------------------------------
622                                  int KF_min_size;           * Desired frame length <-> quantizer mapping
623             *-----------------------------------------------------------------------*/
624    
625                                  KF_min_size = desired * (100 - rc->param.kfreduction) / 100;  #ifdef BQUANT_PRESCALE
626                                  if (KF_min_size < 1)          /* For bframes we prescale the quantizer to avoid too high quant scaling */
627                                          KF_min_size = 1;          if(s->type == XVID_TYPE_BVOP) {
628    
629                                  desired = KF_min_size + (desired - KF_min_size) * KFdistance /                  twopass_stat_t *b_ref = s;
                                         (rc->param.kftreshold - rc->param.min_key_interval);  
630    
631                                  if (desired < 1)                  /* Find the reference frame */
632                                          desired = 1;                  while(b_ref != &rc->stats[0] && b_ref->type == XVID_TYPE_BVOP)
633                          }                          b_ref--;
634    
635                    /* Compute the original quant */
636                    s->quant  = 2*(100*s->quant - data->bquant_offset);
637                    s->quant += data->bquant_ratio - 1; /* to avoid rounding issues */
638                    s->quant  = s->quant/data->bquant_ratio - b_ref->quant;
639                  }                  }
640          }  #endif
   
         overflow = (int)((double)overflow * desired / rc->avg_length[XVID_TYPE_PVOP-1]);  
641    
642          /* Reign in overflow with huge frames */          /* Don't laugh at this very 'simple' quant<->size relationship, it
643          if (labs(overflow) > labs(rc->overflow))           * proves to be acurate enough for our algorithm */
644                  overflow = rc->overflow;          scaled_quant = (double)s->quant*(double)s->length/(double)dbytes;
645    
646    #ifdef COMPENSATE_FORMULA
647            /* We know xvidcore will apply the bframe formula again, so we compensate
648             * it right now to make sure we would not apply it twice */
649            if(s->type == XVID_TYPE_BVOP) {
650    
651          /* Make sure overflow doesn't run away */                  twopass_stat_t *b_ref = s;
         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;  
         }  
652    
653          /* Make sure we are not higher than desired frame size */                  /* Find the reference frame */
654          if (desired > rc->max_length) {                  while(b_ref != &rc->stats[0] && b_ref->type == XVID_TYPE_BVOP)
655                  capped_to_max_framesize = 1;                          b_ref--;
656                  desired = rc->max_length;  
657                  DPRINTF(XVID_DEBUG_RC,"[%i] Capped to maximum frame size\n",                  /* Compute the quant it would be if the core did not apply the bframe
658                                  data->frame_num);                   * formula */
659                    scaled_quant  = 100*scaled_quant - data->bquant_offset;
660                    scaled_quant += data->bquant_ratio - 1; /* to avoid rouding issues */
661                    scaled_quant /= data->bquant_ratio;
662          }          }
663    #endif
664    
665          /* Make sure to not scale below the minimum framesize */          /* Quantizer has been scaled using floating point operations/results, we
666          if (desired < rc->min_length[s->type-1]) {           * must cast it to integer */
                 desired = rc->min_length[s->type-1];  
                 DPRINTF(XVID_DEBUG_RC,"[%i] Capped to minimum frame size\n",  
                                 data->frame_num);  
         }  
   
         /*  
          * Don't laugh at this very 'simple' quant<->filesize relationship, it  
          * 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  
          */  
667          data->quant = (int)scaled_quant;          data->quant = (int)scaled_quant;
668    
669          /* Let's clip the computed quantizer, if needed */          /* Let's clip the computed quantizer, if needed */
# Line 539  Line 671 
671                  data->quant = 1;                  data->quant = 1;
672          } else if (data->quant > 31) {          } else if (data->quant > 31) {
673                  data->quant = 31;                  data->quant = 31;
674          } else if (s->type != XVID_TYPE_IVOP) {          } else {
675    
676                  /*                  /* 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  
677                   * computed quantizer, do not loose quantizer decimal part that we                   * computed quantizer, do not loose quantizer decimal part that we
678                   * accumulate for later reuse when its sum represents a complete unit.                   * accumulate for later reuse when its sum represents a complete
679                   */                   * unit. */
680                  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;
681    
682                  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 686 
686                          rc->quant_error[s->type-1][data->quant] += 1.0;                          rc->quant_error[s->type-1][data->quant] += 1.0;
687                          data->quant--;                          data->quant--;
688                  }                  }
   
689          }          }
690    
691          /*          /* 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  
692           * possible +1 correction due to cumulated error. We can now safely clip           * possible +1 correction due to cumulated error. We can now safely clip
693           * the quantizer again with user's quant ranges. "Safely" means the Rate           * the quantizer again with user's quant ranges. "Safely" means the Rate
694           * Control could learn more about this quantizer, this knowledge is useful           * Control could learn more about this quantizer, this knowledge is useful
695           * 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,
696           * that's why we don't perform this clipping earlier.           * that's why we don't perform this clipping earlier. */
          */  
697          if (data->quant < data->min_quant[s->type-1]) {          if (data->quant < data->min_quant[s->type-1]) {
698                  data->quant = data->min_quant[s->type-1];                  data->quant = data->min_quant[s->type-1];
699          } else if (data->quant > data->max_quant[s->type-1]) {          } else if (data->quant > data->max_quant[s->type-1]) {
700                  data->quant = data->max_quant[s->type-1];                  data->quant = data->max_quant[s->type-1];
701          }          }
702    
703          /*          /* 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"  
704           * rule that makes |last_quant - new_quant| <= 2. This rule only applies           * rule that makes |last_quant - new_quant| <= 2. This rule only applies
705           * to predicted frames (P and B)           * to predicted frames (P and B) */
          */  
706          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) {
707    
708                  if (data->quant > rc->last_quant[s->type-1] + 2) {                  if (data->quant > rc->last_quant[s->type-1] + 2) {
709                          data->quant = rc->last_quant[s->type-1] + 2;                          data->quant = rc->last_quant[s->type-1] + 2;
710                          DPRINTF(XVID_DEBUG_RC,                          DPRINTF(XVID_DEBUG_RC,
711                                          "[%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",
712                                          data->frame_num);                                          data->frame_num);
713                  }                  }
714                  if (data->quant < rc->last_quant[s->type-1] - 2) {                  if (data->quant < rc->last_quant[s->type-1] - 2) {
715                          data->quant = rc->last_quant[s->type-1] - 2;                          data->quant = rc->last_quant[s->type-1] - 2;
716                          DPRINTF(XVID_DEBUG_RC,                          DPRINTF(XVID_DEBUG_RC,
717                                          "[%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",
718                                          data->frame_num);                                          data->frame_num);
719                  }                  }
720          }          }
721    
722          /*          /* We don't want to pollute the RC histerisis when our computed quant has
723           * 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  
          */  
724          if (capped_to_max_framesize == 0)          if (capped_to_max_framesize == 0)
725                  rc->last_quant[s->type-1] = data->quant;                  rc->last_quant[s->type-1] = data->quant;
726    
727            /* Don't forget to force 1st pass frame type ;-) */
728            data->type = s->type;
729    
730          return 0;          return 0;
731  }  }
732    
# Line 610  Line 737 
737  rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)  rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)
738  {  {
739          const char frame_type[4] = { 'i', 'p', 'b', 's'};          const char frame_type[4] = { 'i', 'p', 'b', 's'};
740          stat_t * s = &rc->stats[data->frame_num];          twopass_stat_t * s = &rc->stats[data->frame_num];
741    
742          /* Insufficent stats data */          /* Insufficent stats data */
743      if (data->frame_num >= rc->num_frames)      if (data->frame_num >= rc->num_frames)
744          return 0;          return 0;
745    
746      rc->quant_count[data->quant]++;          /* Update the quantizer counter */
747            rc->quant_count[s->type-1][data->quant]++;
748    
749            /* Update the frame type overflow */
750      if (data->type == XVID_TYPE_IVOP) {      if (data->type == XVID_TYPE_IVOP) {
751          int kfdiff = (rc->keyframe_locations[rc->KF_idx] -      rc->keyframe_locations[rc->KF_idx - 1]);                  int kfdiff = 0;
752    
753                    if(rc->KF_idx != rc->num_frames -1) {
754                            kfdiff  = rc->keyframe_locations[rc->KF_idx+1];
755                            kfdiff -= rc->keyframe_locations[rc->KF_idx];
756                    }
757    
758                    /* Flush Keyframe overflow accumulator */
759          rc->overflow += rc->KFoverflow;          rc->overflow += rc->KFoverflow;
760    
761                    /* Store the frame overflow to the keyframe accumulator */
762          rc->KFoverflow = s->desired_length - data->length;          rc->KFoverflow = s->desired_length - data->length;
763    
764          if (kfdiff > 1) {  // non-consecutive keyframes                  if (kfdiff > 1) {
765                            /* Non-consecutive keyframes case:
766                             * We can then divide this total keyframe overflow into equal parts
767                             * that we will distribute into regular overflow at each frame
768                             * between the sequence bounded by two IFrames */
769              rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);              rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);
770          }else{ // consecutive keyframes                  } else {
771                            /* Consecutive keyframes case:
772                             * Flush immediatly the keyframe overflow and reset keyframe
773                             * overflow */
774                          rc->overflow += rc->KFoverflow;                          rc->overflow += rc->KFoverflow;
775                          rc->KFoverflow = 0;                          rc->KFoverflow = 0;
776                          rc->KFoverflow_partial = 0;                          rc->KFoverflow_partial = 0;
777          }          }
778          rc->KF_idx++;          rc->KF_idx++;
779      } else {      } else {
780          // distribute part of the keyframe overflow                  /* Accumulate the frame overflow */
781          rc->overflow += s->desired_length - data->length + rc->KFoverflow_partial;                  rc->overflow += s->desired_length - data->length;
782    
783                    /* Distribute part of the keyframe overflow */
784                    rc->overflow += rc->KFoverflow_partial;
785    
786                    /* Don't forget to substract that same amount from the total keyframe
787                     * overflow */
788          rc->KFoverflow -= rc->KFoverflow_partial;          rc->KFoverflow -= rc->KFoverflow_partial;
789      }      }
790    
791          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);
792            rc->real_total += data->length;
793    
794            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",
795                          data->frame_num,                          data->frame_num,
796                          frame_type[data->type-1],                          frame_type[data->type-1],
797                          data->quant,                          data->quant,
798                          s->length,                          s->length,
799                          s->scaled_length,                          s->scaled_length,
                         data->length,  
800                          s->desired_length,                          s->desired_length,
801                            s->desired_length - s->error,
802                            -s->error,
803                          rc->overflow);                          rc->overflow);
804    
805      return(0);      return(0);
# Line 655  Line 809 
809   * Helper functions definition   * Helper functions definition
810   ****************************************************************************/   ****************************************************************************/
811    
812    /* Default buffer size for reading lines */
813  #define BUF_SZ   1024  #define BUF_SZ   1024
 #define MAX_COLS 5  
814    
815  /* open stats file, and count num frames */  /* Helper functions for reading/parsing the stats file */
816    static char *skipspaces(char *string);
817    static int iscomment(char *string);
818    static char *readline(FILE *f);
819    
820    /* This function counts the number of frame entries in the stats file
821     * It also counts the number of I Frames */
822  static int  static int
823  det_stats_length(rc_2pass2_t * rc, char * filename)  statsfile_count_frames(rc_2pass2_t * rc, char * filename)
824  {  {
825      FILE * f;      FILE * f;
826      int n, ignore;          char *line;
827      char type;          int lines;
828    
829      rc->num_frames = 0;      rc->num_frames = 0;
830      rc->num_keyframes = 0;      rc->num_keyframes = 0;
831    
832      if ((f = fopen(filename, "rt")) == NULL)          if ((f = fopen(filename, "rb")) == NULL)
833          return 0;                  return(-1);
834    
835      while((n = fscanf(f, "%c %d %d %d %d %d %d\n",          lines = 0;
836          &type, &ignore, &ignore, &ignore, &ignore, &ignore, &ignore)) != EOF) {          while ((line = readline(f)) != NULL) {
837          if (type == 'i') {  
838              rc->num_frames++;                  char *ptr;
839                    char type;
840                    int fields;
841    
842                    lines++;
843    
844                    /* We skip spaces */
845                    ptr = skipspaces(line);
846    
847                    /* Skip coment lines or empty lines */
848                    if(iscomment(ptr) || *ptr == '\0') {
849                            free(line);
850                            continue;
851                    }
852    
853                    /* Read the stat line from buffer */
854                    fields = sscanf(ptr, "%c", &type);
855    
856                    /* Valid stats files have at least 7 fields */
857                    if (fields == 1) {
858                            switch(type) {
859                            case 'i':
860                            case 'I':
861              rc->num_keyframes++;              rc->num_keyframes++;
862          }else if (type == 'p' || type == 'b' || type == 's') {                          case 'p':
863                            case 'P':
864                            case 'b':
865                            case 'B':
866                            case 's':
867                            case 'S':
868              rc->num_frames++;              rc->num_frames++;
869                                    break;
870                            default:
871                                    DPRINTF(XVID_DEBUG_RC,
872                                                    "[xvid rc] -- WARNING: L%d unknown frame type used (%c).\n",
873                                                    lines, type);
874          }          }
875                    } else {
876                                    DPRINTF(XVID_DEBUG_RC,
877                                                    "[xvid rc] -- WARNING: L%d misses some stat fields (%d).\n",
878                                                    lines, 7-fields);
879                    }
880    
881                    /* Free the line buffer */
882                    free(line);
883      }      }
884    
885            /* We are done with the file */
886      fclose(f);      fclose(f);
887    
888      return 1;          return(0);
889  }  }
890    
891  /* open stats file(s) and read into rc->stats array */  /* open stats file(s) and read into rc->stats array */
   
892  static int  static int
893  load_stats(rc_2pass2_t *rc, char * filename)  statsfile_load(rc_2pass2_t *rc, char * filename)
894  {  {
895      FILE * f;      FILE * f;
896      int i, not_scaled;          int processed_entries;
897    
898            /* Opens the file */
899            if ((f = fopen(filename, "rb"))==NULL)
900                    return(-1);
901    
902      if ((f = fopen(filename, "rt"))==NULL)          processed_entries = 0;
903          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;  
904          char type;          char type;
905                    int fields;
906                    twopass_stat_t * s = &rc->stats[processed_entries];
907                    char *line, *ptr;
908    
909                    /* Read the line from the file */
910                    if((line = readline(f)) == NULL)
911                            break;
912    
913                    /* We skip spaces */
914                    ptr = skipspaces(line);
915    
916                    /* Skip comment lines or empty lines */
917                    if(iscomment(ptr) || *ptr == '\0') {
918                            free(line);
919                            continue;
920                    }
921    
922                    /* Reset this field that is optional */
923                  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;  
                 }  
924    
925          if (type == 'i') {                  /* Convert the fields */
926                    fields = sscanf(ptr,
927                                                    "%c %d %d %d %d %d %d %d\n",
928                                                    &type,
929                                                    &s->quant,
930                                                    &s->blks[0], &s->blks[1], &s->blks[2],
931                                                    &s->length, &s->invariant /* not really yet */,
932                                                    &s->scaled_length);
933    
934                    /* Free line buffer, we don't need it anymore */
935                    free(line);
936    
937                    /* Fail silently, this has probably been warned in
938                     * statsfile_count_frames */
939                    if(fields != 7 && fields != 8)
940                            continue;
941    
942                    /* Convert frame type and compute the invariant length part */
943                    switch(type) {
944                    case 'i':
945                    case 'I':
946              s->type = XVID_TYPE_IVOP;              s->type = XVID_TYPE_IVOP;
947          }else if (type == 'p' || type == 's') {                          s->invariant /= INVARIANT_HEADER_PART_IVOP;
948                            break;
949                    case 'p':
950                    case 'P':
951                    case 's':
952                    case 'S':
953              s->type = XVID_TYPE_PVOP;              s->type = XVID_TYPE_PVOP;
954          }else if (type == 'b') {                          s->invariant /= INVARIANT_HEADER_PART_PVOP;
955                            break;
956                    case 'b':
957                    case 'B':
958              s->type = XVID_TYPE_BVOP;              s->type = XVID_TYPE_BVOP;
959          }else{  /* unknown type */                          s->invariant /= INVARIANT_HEADER_PART_BVOP;
960              DPRINTF(XVID_DEBUG_RC, "unknown stats frame type; assuming pvop\n");                          break;
961              s->type = XVID_TYPE_PVOP;                  default:
962                            /* Same as before, fail silently */
963                            continue;
964          }          }
965    
966          i++;                  /* Ok it seems it's been processed correctly */
967                    processed_entries++;
968      }      }
969    
970      rc->num_frames = i;          /* Close the file */
   
971          fclose(f);          fclose(f);
972    
973      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);  
     }  
974  }  }
 #endif  
975    
976  /* pre-process the statistics data  /* pre-process the statistics data
977      - for each type, count, tot_length, min_length, max_length   * - for each type, count, tot_length, min_length, max_length
978      - set keyframes_locations   * - set keyframes_locations */
 */  
   
979  static void  static void
980  pre_process0(rc_2pass2_t * rc)  first_pass_stats_prepare_data(rc_2pass2_t * rc)
981  {  {
982      int i,j;      int i,j;
983    
984          /*          /* *rc fields initialization
          * *rc fields initialization  
985           * 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
986           *     with real values of the 1pass           *     with real values of the 1pass */
          */  
987           for (i=0; i<3; i++) {           for (i=0; i<3; i++) {
988                  rc->count[i]=0;                  rc->count[i]=0;
989                  rc->tot_length[i] = 0;                  rc->tot_length[i] = 0;
990                    rc->tot_invariant[i] = 0;
991                  rc->min_length[i] = INT_MAX;                  rc->min_length[i] = INT_MAX;
992      }      }
993    
994          rc->max_length = INT_MIN;          rc->max_length = INT_MIN;
995    
996          /*          /* Loop through all frames and find/compute all the stuff this function
997           * Loop through all frames and find/compute all the stuff this function           * is supposed to do */
          * is supposed to do  
          */  
998          for (i=j=0; i<rc->num_frames; i++) {          for (i=j=0; i<rc->num_frames; i++) {
999                  stat_t * s = &rc->stats[i];                  twopass_stat_t * s = &rc->stats[i];
1000    
1001                  rc->count[s->type-1]++;                  rc->count[s->type-1]++;
1002                  rc->tot_length[s->type-1] += s->length;                  rc->tot_length[s->type-1] += s->length;
1003                    rc->tot_invariant[s->type-1] += s->invariant;
1004    
1005                  if (s->length < rc->min_length[s->type-1]) {                  if (s->length < rc->min_length[s->type-1]) {
1006                          rc->min_length[s->type-1] = s->length;                          rc->min_length[s->type-1] = s->length;
# Line 793  Line 1016 
1016                  }                  }
1017          }          }
1018    
1019          /*          /* NB:
          * Nota Bene:  
1020           * The "per sequence" overflow system considers a natural sequence to be           * The "per sequence" overflow system considers a natural sequence to be
1021           * 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
1022           * 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
1023           * frame to appear in the keyframe locations array.           * frame to appear in the keyframe locations array. */
          */  
1024      rc->keyframe_locations[j] = i;      rc->keyframe_locations[j] = i;
1025    
1026          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]);
1027          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]);
1028          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]);
1029  }  }
1030    
1031  /* calculate zone weight "center" */  /* calculate zone weight "center" */
   
1032  static void  static void
1033  zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)  zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)
1034  {  {
# Line 817  Line 1037 
1037    
1038      rc->avg_weight = 0.0;      rc->avg_weight = 0.0;
1039      rc->tot_quant = 0;      rc->tot_quant = 0;
1040            rc->tot_quant_invariant = 0;
1041    
1042      if (create->num_zones == 0) {      if (create->num_zones == 0) {
1043          for (j = 0; j < rc->num_frames; j++) {          for (j = 0; j < rc->num_frames; j++) {
# Line 850  Line 1070 
1070              next -= create->zones[i].frame;              next -= create->zones[i].frame;
1071              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;
1072              n += next;              n += next;
1073          }else{  // XVID_ZONE_QUANT                  } else{  /* XVID_ZONE_QUANT */
1074              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++ ) {
1075                  rc->stats[j].zone_mode = XVID_ZONE_QUANT;                  rc->stats[j].zone_mode = XVID_ZONE_QUANT;
1076                  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;
1077                  rc->tot_quant += rc->stats[j].length;                  rc->tot_quant += rc->stats[j].length;
1078                                    rc->tot_quant_invariant += rc->stats[j].invariant;
1079              }              }
1080          }          }
1081      }      }
1082      rc->avg_weight = n>0 ? rc->avg_weight/n : 1.0;      rc->avg_weight = n>0 ? rc->avg_weight/n : 1.0;
1083    
1084      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);
1085  }  }
1086    
1087    
1088  /* scale the curve */  /* scale the curve */
   
1089  static void  static void
1090  internal_scale(rc_2pass2_t *rc)  first_pass_scale_curve_internal(rc_2pass2_t *rc)
1091  {  {
1092          int64_t target  = rc->target - rc->tot_quant;          int64_t target;
1093          int64_t pass1_length = rc->tot_length[0] + rc->tot_length[1] + rc->tot_length[2] - rc->tot_quant;          int64_t pass1_length;
1094            int64_t total_invariant;
1095          double scaler;          double scaler;
1096          int i, num_MBs;          int i, num_MBs;
1097          int min_size[3];  
1098            /* We only scale texture data ! */
1099            total_invariant  = rc->tot_invariant[XVID_TYPE_IVOP-1];
1100            total_invariant += rc->tot_invariant[XVID_TYPE_PVOP-1];
1101            total_invariant += rc->tot_invariant[XVID_TYPE_BVOP-1];
1102            /* don't forget to substract header bytes used in quant zones, otherwise we
1103             * counting them twice */
1104            total_invariant -= rc->tot_quant_invariant;
1105    
1106            /* We remove the bytes used by the fixed quantizer zones during first pass
1107             * with the same quants, so we know very precisely how much that
1108             * represents */
1109            target  = rc->target;
1110            target -= rc->tot_quant;
1111    
1112            /* Do the same for the first pass data */
1113            pass1_length  = rc->tot_length[XVID_TYPE_IVOP-1];
1114            pass1_length += rc->tot_length[XVID_TYPE_PVOP-1];
1115            pass1_length += rc->tot_length[XVID_TYPE_BVOP-1];
1116            pass1_length -= rc->tot_quant;
1117    
1118          /* Let's compute a linear scaler in order to perform curve scaling */          /* Let's compute a linear scaler in order to perform curve scaling */
1119          scaler = (double)target / (double)pass1_length;          scaler = (double)(target - total_invariant) / (double)(pass1_length - total_invariant);
1120    
1121          if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {  #ifdef PASS_SMALLER
1122                  DPRINTF(XVID_DEBUG_RC, "WARNING: Undersize detected\n");          if ((target - total_invariant) <= 0 ||
1123                    (pass1_length - total_invariant) <= 0 ||
1124                    target >= pass1_length) {
1125                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- WARNING: Undersize detected before correction\n");
1126          scaler = 1.0;          scaler = 1.0;
1127          }          }
1128    #endif
1129            /* Compute min frame lengths (for each frame type) according to the number
1130             * of MBs. We sum all block type counters of frame 0, this gives us the
1131             * number of MBs.
1132             *
1133             * We compare these hardcoded values with observed values in first pass
1134             * (determined in pre_process0).Then we keep the real minimum. */
1135    
1136      DPRINTF(XVID_DEBUG_RC,          /* Number of MBs */
1137                          "Before correction: target=%i, tot_length=%i, scaler=%f\n",          num_MBs  = rc->stats[0].blks[0];
1138                          (int)target, (int)pass1_length, scaler);          num_MBs += rc->stats[0].blks[1];
1139            num_MBs += rc->stats[0].blks[2];
1140          /*  
1141           * Compute min frame lengths (for each frame type) according to the number          /* Minimum for I frames */
1142           * of MBs. We sum all blocks count from frame 0 (should be an IFrame, so          if(rc->min_length[XVID_TYPE_IVOP-1] > ((num_MBs*22) + 240) / 8)
1143           * blocks[0] should be enough) to know how many MBs there are.                  rc->min_length[XVID_TYPE_IVOP-1] = ((num_MBs*22) + 240) / 8;
1144           */  
1145          num_MBs = rc->stats[0].blks[0] + rc->stats[0].blks[1] + rc->stats[0].blks[2];          /* Minimum for P/S frames */
1146          min_size[0] = ((num_MBs*22) + 240) / 8;          if(rc->min_length[XVID_TYPE_PVOP-1] > ((num_MBs) + 88)  / 8)
1147          min_size[1] = ((num_MBs)    + 88)  / 8;                  rc->min_length[XVID_TYPE_PVOP-1] = ((num_MBs) + 88)  / 8;
1148          min_size[2] = 8;  
1149            /* Minimum for B frames */
1150            if(rc->min_length[XVID_TYPE_BVOP-1] > 8)
1151                    rc->min_length[XVID_TYPE_BVOP-1] = 8;
1152    
1153          /*          /* Perform an initial scale pass.
1154           * Perform an initial scale pass.           *
1155           * If a frame size is scaled underneath our hardcoded minimums, then we           * If a frame size is scaled underneath our hardcoded minimums, then we
1156           * force the frame size to the minimum, and deduct the original & scaled           * force the frame size to the minimum, and deduct the original & scaled
1157           * frame length from the original and target total lengths           * frame length from the original and target total lengths */
          */  
1158          for (i=0; i<rc->num_frames; i++) {          for (i=0; i<rc->num_frames; i++) {
1159                  stat_t * s = &rc->stats[i];                  twopass_stat_t * s = &rc->stats[i];
1160                  int len;                  int len;
1161    
1162                    /* No need to scale frame length for which a specific quantizer is
1163                     * specified thanks to zones */
1164          if (s->zone_mode == XVID_ZONE_QUANT) {          if (s->zone_mode == XVID_ZONE_QUANT) {
1165              s->scaled_length = s->length;              s->scaled_length = s->length;
1166                          continue;                          continue;
1167                  }                  }
1168    
1169                  /* Compute the scaled length */                  /* Compute the scaled length -- only non invariant data length is scaled */
1170                  len = (int)((double)s->length * scaler * s->weight / rc->avg_weight);                  len = s->invariant + (int)((double)(s->length-s->invariant) * scaler * s->weight / rc->avg_weight);
1171    
1172                  /* Compare with the computed minimum */                  /* Compare with the computed minimum */
1173                  if (len < min_size[s->type-1]) {                  if (len < rc->min_length[s->type-1]) {
1174                          /* force frame size to our computed minimum */                          /* This is a 'forced size' frame, set its frame size to the
1175                          s->scaled_length = min_size[s->type-1];                           * computed minimum */
1176                            s->scaled_length = rc->min_length[s->type-1];
1177    
1178                            /* Remove both scaled and original size from their respective
1179                             * total counters, as we prepare a second pass for 'regular'
1180                             * frames */
1181                          target -= s->scaled_length;                          target -= s->scaled_length;
1182                          pass1_length -= s->length;                          pass1_length -= s->length;
1183                  } else {                  } else {
# Line 927  Line 1186 
1186                  }                  }
1187          }          }
1188    
1189          /* Correct the scaler for all non forced frames */          /* The first pass on data substracted all 'forced size' frames from the
1190          scaler = (double)target / (double)pass1_length;           * total counters. Now, it's possible to scale the 'regular' frames. */
1191    
1192            /* Scaling factor for 'regular' frames */
1193            scaler = (double)(target - total_invariant) / (double)(pass1_length - total_invariant);
1194    
1195    #ifdef PASS_SMALLER
1196          /* Detect undersizing */          /* Detect undersizing */
1197      if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {      if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {
1198                  DPRINTF(XVID_DEBUG_RC, "WARNING: Undersize detected\n");                  DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- WARNING: Undersize detected after correction\n");
1199                  scaler = 1.0;                  scaler = 1.0;
1200          }          }
1201    #endif
         DPRINTF(XVID_DEBUG_RC,  
                         "After correction: target=%i, tot_length=%i, scaler=%f\n",  
                         (int)target, (int)pass1_length, scaler);  
1202    
1203          /* Do another pass with the new scaler */          /* Do another pass with the new scaler */
1204          for (i=0; i<rc->num_frames; i++) {          for (i=0; i<rc->num_frames; i++) {
1205                  stat_t * s = &rc->stats[i];                  twopass_stat_t * s = &rc->stats[i];
1206    
1207                  /* Ignore frame with forced frame sizes */                  /* Ignore frame with forced frame sizes */
1208                  if (s->scaled_length == 0)                  if (s->scaled_length == 0)
1209                          s->scaled_length = (int)((double)s->length * scaler * s->weight / rc->avg_weight);                          s->scaled_length = s->invariant + (int)((double)(s->length-s->invariant) * scaler * s->weight / rc->avg_weight);
1210          }          }
1211    
1212            /* Job done */
1213            return;
1214  }  }
1215    
1216    /* Apply all user settings to the scaled curve
1217     * This implies:
1218     *   keyframe boosting
1219     *   high/low compression */
1220  static void  static void
1221  pre_process1(rc_2pass2_t * rc)  scaled_curve_apply_advanced_parameters(rc_2pass2_t * rc)
1222  {  {
1223      int i;      int i;
1224      double total1, total2;          int64_t ivop_boost_total;
     uint64_t ivop_boost_total;  
1225    
1226      ivop_boost_total = 0;          /* Reset the rate controller (per frame type) total byte counters */
1227      rc->curve_comp_error = 0;          for (i=0; i<3; i++) rc->tot_scaled_length[i] = 0;
1228    
1229      for (i=0; i<3; i++) {          /* Compute total bytes for each frame type */
1230          rc->tot_scaled_length[i] = 0;          for (i=0; i<rc->num_frames;i++) {
1231                    twopass_stat_t *s = &rc->stats[i];
1232                    rc->tot_scaled_length[s->type-1] += s->scaled_length;
1233      }      }
1234    
1235            /* First we compute the total amount of bits needed, as being described by
1236             * the scaled distribution. During this pass over the complete stats data,
1237             * we see how much bits two user settings will get/give from/to p&b frames:
1238             *  - keyframe boosting
1239             *  - keyframe distance penalty */
1240            rc->KF_idx = 0;
1241            ivop_boost_total = 0;
1242      for (i=0; i<rc->num_frames; i++) {      for (i=0; i<rc->num_frames; i++) {
1243          stat_t * s = &rc->stats[i];                  twopass_stat_t * s = &rc->stats[i];
   
         rc->tot_scaled_length[s->type-1] += s->scaled_length;  
1244    
1245                    /* Some more work is needed for I frames */
1246          if (s->type == XVID_TYPE_IVOP) {          if (s->type == XVID_TYPE_IVOP) {
1247              ivop_boost_total += s->scaled_length * rc->param.keyframe_boost / 100;                          int ivop_boost;
1248    
1249                            /* Accumulate bytes needed for keyframe boosting */
1250                            ivop_boost = s->scaled_length*rc->param.keyframe_boost/100;
1251    
1252    #if 0 /* ToDo: decide how to apply kfthresholding */
1253    #endif
1254                            /* If the frame size drops under the minimum length, then cap ivop_boost */
1255                            if (ivop_boost + s->scaled_length < rc->min_length[XVID_TYPE_IVOP-1])
1256                                    ivop_boost = rc->min_length[XVID_TYPE_IVOP-1] - s->scaled_length;
1257    
1258                            /* Accumulate the ivop boost */
1259                            ivop_boost_total += ivop_boost;
1260    
1261                            /* Don't forget to update the keyframe index */
1262                            rc->KF_idx++;
1263          }          }
1264      }      }
1265    
1266      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
1267                                          (rc->tot_scaled_length[XVID_TYPE_PVOP-1] + rc->tot_scaled_length[XVID_TYPE_BVOP-1]));           *
1268             * This ratio has to be applied to p/b/s frames in order to reserve
1269             * additional bits for keyframes (keyframe boosting) or if too much
1270             * keyframe distance is applied, bits retrieved from the keyframes.
1271             *
1272             * ie pb_length *= rc->pb_iboost_tax_ratio;
1273             *
1274             *    gives the ideal length of a p/b frame */
1275    
1276            /* Compute the total length of p/b/s frames (temporary storage into
1277             * movie_curve) */
1278            rc->pb_iboost_tax_ratio  = (double)rc->tot_scaled_length[XVID_TYPE_PVOP-1];
1279            rc->pb_iboost_tax_ratio += (double)rc->tot_scaled_length[XVID_TYPE_BVOP-1];
1280    
1281            /* Compute the ratio described above
1282             *     taxed_total = sum(0, n, tax*scaled_length)
1283             * <=> taxed_total = tax.sum(0, n, scaled_length)
1284             * <=> tax = taxed_total / original_total */
1285            rc->pb_iboost_tax_ratio =
1286                    (rc->pb_iboost_tax_ratio - ivop_boost_total) /
1287                    rc->pb_iboost_tax_ratio;
1288    
1289            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- IFrame boost tax ratio:%.2f\n",
1290                            rc->pb_iboost_tax_ratio);
1291    
1292            /* Compute the average size of frames per frame type */
1293      for(i=0; i<3; i++) {      for(i=0; i<3; i++) {
1294          if (rc->count[i] == 0 || rc->movie_curve == 0) {                  /* Special case for missing type or weird case */
1295                    if (rc->count[i] == 0 || rc->pb_iboost_tax_ratio == 0) {
1296              rc->avg_length[i] = 1;              rc->avg_length[i] = 1;
1297          }else{          }else{
1298              rc->avg_length[i] = rc->tot_scaled_length[i] / rc->count[i] / rc->movie_curve;                          rc->avg_length[i] = rc->tot_scaled_length[i];
1299          }  
1300                            if (i == (XVID_TYPE_IVOP-1)) {
1301                                    /* I Frames total has to be added the boost total */
1302                                    rc->avg_length[i] += ivop_boost_total;
1303                            } else {
1304                                    /* P/B frames has to taxed */
1305                                    rc->avg_length[i] *= rc->pb_iboost_tax_ratio;
1306      }      }
1307    
1308      /* --- */                          /* Finally compute the average frame size */
1309                            rc->avg_length[i] /= (double)rc->count[i];
1310                    }
1311            }
1312    
1313      total1=total2=0;          /* Assymetric curve compression */
1314            if (rc->param.curve_compression_high || rc->param.curve_compression_low) {
1315                    double symetric_total;
1316                    double assymetric_delta_total;
1317    
1318                    /* Like I frame boosting, assymetric curve compression modifies the total
1319                     * amount of needed bits, we must compute the ratio so we can prescale
1320                     lengths */
1321                    symetric_total = 0;
1322                    assymetric_delta_total = 0;
1323      for (i=0; i<rc->num_frames; i++) {      for (i=0; i<rc->num_frames; i++) {
1324          stat_t * s = &rc->stats[i];                          double assymetric_delta;
1325                            double dbytes;
1326                            twopass_stat_t * s = &rc->stats[i];
1327    
1328                            /* I Frames are not concerned by assymetric scaling */
1329                            if (s->type == XVID_TYPE_IVOP)
1330                                    continue;
1331    
1332          if (s->type != XVID_TYPE_IVOP) {                          /* During the real run, we would have to apply the iboost tax */
1333              double dbytes,dbytes2;                          dbytes = s->scaled_length * rc->pb_iboost_tax_ratio;
1334    
1335              dbytes = s->scaled_length / rc->movie_curve;                          /* Update the symmetric curve compression total */
1336              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];  
1337    
1338                          if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                          /* Apply assymetric curve compression */
1339                                  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])
1340                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * (double)rc->param.curve_compression_high / 100.0f;
1341                            else
1342                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * (double)rc->param.curve_compression_low  / 100.0f;
1343    
1344                            /* Cap to the minimum frame size if needed */
1345                            if (dbytes + assymetric_delta < rc->min_length[s->type-1])
1346                                    assymetric_delta = rc->min_length[s->type-1] - dbytes;
1347    
1348                            /* Accumulate after assymetric curve compression */
1349                            assymetric_delta_total += assymetric_delta;
1350                    }
1351    
1352                    /* Compute the tax that all p/b frames have to pay in order to respect the
1353                     * bit distribution changes that the assymetric compression curve imposes
1354                     * We want assymetric_total = sum(0, n-1, tax.scaled_length)
1355                     *      ie assymetric_total = ratio.sum(0, n-1, scaled_length)
1356                     *         ratio = assymetric_total / symmetric_total */
1357                    rc->assymetric_tax_ratio = ((double)symetric_total - (double)assymetric_delta_total) / (double)symetric_total;
1358                          } else {                          } else {
1359                                  dbytes2 = ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_low / 100.0);                  rc->assymetric_tax_ratio = 1.0f;
1360                          }                          }
1361    
1362              if (s->type == XVID_TYPE_BVOP) {          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Assymetric tax ratio:%.2f\n", rc->assymetric_tax_ratio);
1363                              dbytes2 *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
1364                              if (dbytes2 < rc->min_length[XVID_TYPE_BVOP-1])          /* Last bits that need to be reset */
1365                                      dbytes2 = rc->min_length[XVID_TYPE_BVOP-1];          rc->overflow = 0;
1366              }else{          rc->KFoverflow = 0;
1367                              if (dbytes2 < rc->min_length[XVID_TYPE_PVOP-1])          rc->KFoverflow_partial = 0;
1368                                      dbytes2 = rc->min_length[XVID_TYPE_PVOP-1];          rc->KF_idx = 0;
1369            rc->desired_total = 0;
1370            rc->real_total = 0;
1371    
1372            /* Job done */
1373            return;
1374              }              }
1375              total2 += dbytes2;  
1376    /*****************************************************************************
1377     * Still more low level stuff (nothing to do with stats treatment)
1378     ****************************************************************************/
1379    
1380    /* This function returns an allocated string containing a complete line read
1381     * from the file starting at the current position */
1382    static char *
1383    readline(FILE *f)
1384    {
1385            char *buffer = NULL;
1386            int buffer_size = 0;
1387            int pos = 0;
1388    
1389            do {
1390                    int c;
1391    
1392                    /* Read a character from the stream */
1393                    c = fgetc(f);
1394    
1395                    /* Is that EOF or new line ? */
1396                    if(c == EOF || c == '\n')
1397                            break;
1398    
1399                    /* Do we have to update buffer ? */
1400                    if(pos >= buffer_size - 1) {
1401                            buffer_size += BUF_SZ;
1402                            buffer = (char*)realloc(buffer, buffer_size);
1403                            if (buffer == NULL)
1404                                    return(NULL);
1405          }          }
1406    
1407                    buffer[pos] = c;
1408                    pos++;
1409            } while(1);
1410    
1411            /* Read \n or EOF */
1412            if (buffer == NULL) {
1413                    /* EOF, so we reached the end of the file, return NULL */
1414                    if(feof(f))
1415                            return(NULL);
1416    
1417                    /* Just an empty line with just a newline, allocate a 1 byte buffer to
1418                     * store a zero length string */
1419                    buffer = (char*)malloc(1);
1420                    if(buffer == NULL)
1421                            return(NULL);
1422      }      }
1423    
1424      rc->curve_comp_scale = total1 / total2;          /* Zero terminated string */
1425            buffer[pos] = '\0';
1426    
1427          DPRINTF(XVID_DEBUG_RC, "middle frame size for asymmetric curve compression: %i\n",          return(buffer);
1428              (int)(rc->avg_length[XVID_TYPE_PVOP-1] * rc->curve_comp_scale));  }
1429    
1430      rc->overflow = 0;  /* This function returns a pointer to the first non space char in the given
1431      rc->KFoverflow = 0;   * string */
1432      rc->KFoverflow_partial = 0;  static char *
1433      rc->KF_idx = 1;  skipspaces(char *string)
1434    {
1435            const char spaces[] =
1436                    {
1437                            ' ','\t','\0'
1438                    };
1439            const char *spacechar = spaces;
1440    
1441            if (string == NULL) return(NULL);
1442    
1443            while (*string != '\0') {
1444                    /* Test against space chars */
1445                    while (*spacechar != '\0') {
1446                            if (*string == *spacechar) {
1447                                    string++;
1448                                    spacechar = spaces;
1449                                    break;
1450                            }
1451                            spacechar++;
1452                    }
1453    
1454                    /* No space char */
1455                    if (*spacechar == '\0') return(string);
1456            }
1457    
1458            return(string);
1459  }  }
1460    
1461    /* This function returns a boolean that tells if the string is only a
1462     * comment */
1463    static int
1464    iscomment(char *string)
1465    {
1466            const char comments[] =
1467                    {
1468                            '#',';', '%', '\0'
1469                    };
1470            const char *cmtchar = comments;
1471            int iscomment = 0;
1472    
1473            if (string == NULL) return(1);
1474    
1475            string = skipspaces(string);
1476    
1477            while(*cmtchar != '\0') {
1478                    if(*string == *cmtchar) {
1479                            iscomment = 1;
1480                            break;
1481                    }
1482                    cmtchar++;
1483            }
1484    
1485            return(iscomment);
1486    }
1487    
1488    #if 0
1489    static void
1490    stats_print(rc_2pass2_t * rc)
1491    {
1492            int i;
1493            const char frame_type[4] = { 'i', 'p', 'b', 's'};
1494    
1495            for (i=0; i<rc->num_frames; i++) {
1496                    twopass_stat_t *s = &rc->stats[i];
1497                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- frame:%d type:%c quant:%d stats:%d scaled:%d desired:%d actual:%d overflow(%c):%.2f\n",
1498                                    i, frame_type[s->type-1], -1, s->length, s->scaled_length,
1499                                    s->desired_length, -1, frame_type[s->type-1], -1.0f);
1500            }
1501    }
1502    #endif
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