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revision 1048, Thu May 29 11:37:20 2003 UTC revision 1309, Wed Jan 7 13:51:24 2004 UTC
# Line 25  Line 25 
25   * along with this program; if not, write to the Free Software   * along with this program; if not, write to the Free Software
26   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
27   *   *
28   * $Id: plugin_2pass2.c,v 1.1.2.15 2003-05-29 11:37:20 edgomez Exp $   * $Id: plugin_2pass2.c,v 1.1.2.34 2004-01-07 13:51:24 edgomez 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 */  
   
         int count[3];   /* count of each frame types */  
         uint64_t tot_length[3];  /* total length of each frame types */  
         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 */  
97    
98          /* zone statistical data */          /* Number of frames of the sequence */
99          double avg_weight;  /* average weight */          int num_frames;
         int64_t tot_quant;   /* total length used by XVID_ZONE_QUANT zones */  
100    
101            /* Number of Intra frames of the sequence */
102            int num_keyframes;
103    
104          double curve_comp_scale;          /* Target filesize to reach */
105          double movie_curve;          uint64_t target;
106    
107          /* dynamic */          /* Count of each frame types */
108            int count[3];
109    
110            /* 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    
135            /* Total length used by XVID_ZONE_QUANT zones */
136            uint64_t tot_quant;
137            uint64_t tot_quant_invariant;
138    
139            /* Holds the total amount of frame bytes, zone weighted (only scalable
140             * part of frame bytes) */
141            uint64_t tot_weighted;
142    
143            /*----------------------------------
144             * Advanced settings helper ratios
145             *--------------------------------*/
146    
147            /* This the ratio that has to be applied to all p/b frames in order
148             * to reserve/retrieve bits for/from keyframe boosting and consecutive
149             * keyframe penalty */
150            double pb_iboost_tax_ratio;
151    
152            /* This the ratio to apply to all b/p frames in order to respect the
153             * assymetric curve compression while respecting a target filesize
154             * NB: The assymetric delta gain has to be computed before this ratio
155             *     is applied, and then the delta is added to the scaled size */
156            double assymetric_tax_ratio;
157    
158            /*----------------------------------
159             * Data from the stats file kept
160             * into RAM for easy access
161             *--------------------------------*/
162    
163            /* Array of keyframe locations
164             * eg: rc->keyframe_locations[100] returns the frame number of the 100th
165             *     keyframe */
166          int * keyframe_locations;          int * keyframe_locations;
         stat_t * stats;  
167    
168            /* Index of the last keyframe used in the keyframe_location */
169            int KF_idx;
170    
171            /* Array of all 1st pass data file -- see the twopass_stat_t structure
172             * definition for more details */
173            twopass_stat_t * stats;
174    
175            /*----------------------------------
176             * Histerysis helpers
177             *--------------------------------*/
178    
179            /* This field holds the int2float conversion errors of each quant per
180             * frame type, this allow the RC to keep track of rouding error and thus
181             * increase or decrease the chosen quant according to this residue */
182          double quant_error[3][32];          double quant_error[3][32];
183          int quant_count[32];  
184            /* This fields stores the count of each quant usage per frame type
185             * No real role but for debugging */
186            int quant_count[3][32];
187    
188            /* Last valid quantizer used per frame type, it allows quantizer
189             * increament/decreament limitation in order to avoid big image quality
190             * "jumps" */
191          int last_quant[3];          int last_quant[3];
192    
193          double curve_comp_error;          /*----------------------------------
194          int overflow;           * Overflow control
195          int KFoverflow;           *--------------------------------*/
196          int KFoverflow_partial;  
197          int KF_idx;          /* Current overflow that has to be distributed to p/b frames */
198            double overflow;
199    
200            /* Total overflow for keyframes -- not distributed directly */
201            double KFoverflow;
202    
203            /* Amount of keyframe overflow to introduce to the global p/b frame
204             * overflow counter at each encoded frame */
205            double KFoverflow_partial;
206    
207            /* Unknown ???
208             * ToDo: description */
209          double fq_error;          double fq_error;
210    
211            /*----------------------------------
212             * Debug
213             *--------------------------------*/
214            double desired_total;
215            double real_total;
216  } rc_2pass2_t;  } rc_2pass2_t;
217    
218    
# Line 132  Line 234 
234  {  {
235      switch(opt) {      switch(opt) {
236      case XVID_PLG_INFO :      case XVID_PLG_INFO :
237            case XVID_PLG_FRAME :
238          return 0;          return 0;
239    
240      case XVID_PLG_CREATE :      case XVID_PLG_CREATE :
# Line 155  Line 258 
258   ****************************************************************************/   ****************************************************************************/
259    
260  /* First a few local helping function prototypes */  /* First a few local helping function prototypes */
261  static  int det_stats_length(rc_2pass2_t * rc, char * filename);  static  int statsfile_count_frames(rc_2pass2_t * rc, char * filename);
262  static  int load_stats(rc_2pass2_t *rc, char * filename);  static  int statsfile_load(rc_2pass2_t *rc, char * filename);
263  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);
264  static void internal_scale(rc_2pass2_t *rc);  static void first_pass_stats_prepare_data(rc_2pass2_t * rc);
265  static void pre_process0(rc_2pass2_t * rc);  static void first_pass_scale_curve_internal(rc_2pass2_t *rc);
266  static void pre_process1(rc_2pass2_t * rc);  static void scaled_curve_apply_advanced_parameters(rc_2pass2_t * rc);
267    #if 0
268    static void stats_print(rc_2pass2_t * rc);
269    #endif
270    
271  /*----------------------------------------------------------------------------  /*----------------------------------------------------------------------------
272   *--------------------------------------------------------------------------*/   *--------------------------------------------------------------------------*/
# Line 178  Line 284 
284    
285      rc->param = *param;      rc->param = *param;
286    
287          /*          /* Initialize all defaults */
          * Initialize all defaults  
          */  
288  #define _INIT(a, b) if((a) <= 0) (a) = (b)  #define _INIT(a, b) if((a) <= 0) (a) = (b)
289      /* Let's set our defaults if needed */      /* Let's set our defaults if needed */
290          _INIT(rc->param.keyframe_boost, DEFAULT_KEYFRAME_BOOST);          _INIT(rc->param.keyframe_boost, DEFAULT_KEYFRAME_BOOST);
291          _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);  
292      _INIT(rc->param.curve_compression_high, DEFAULT_CURVE_COMPRESSION_HIGH);      _INIT(rc->param.curve_compression_high, DEFAULT_CURVE_COMPRESSION_HIGH);
293      _INIT(rc->param.curve_compression_low, DEFAULT_CURVE_COMPRESSION_LOW);      _INIT(rc->param.curve_compression_low, DEFAULT_CURVE_COMPRESSION_LOW);
294      _INIT(rc->param.max_overflow_improvement, DEFAULT_MAX_OVERFLOW_IMPROVEMENT);      _INIT(rc->param.max_overflow_improvement, DEFAULT_MAX_OVERFLOW_IMPROVEMENT);
295      _INIT(rc->param.max_overflow_degradation,  DEFAULT_MAX_OVERFLOW_DEGRADATION);      _INIT(rc->param.max_overflow_degradation,  DEFAULT_MAX_OVERFLOW_DEGRADATION);
296    
297      /* Keyframe settings */      /* Keyframe settings */
         _INIT(rc->param.kftreshold, DEFAULT_KFTRESHOLD);  
298      _INIT(rc->param.kfreduction, DEFAULT_KFREDUCTION);      _INIT(rc->param.kfreduction, DEFAULT_KFREDUCTION);
299      _INIT(rc->param.min_key_interval, DEFAULT_MIN_KEY_INTERVAL);          _INIT(rc->param.kfthreshold, DEFAULT_KFTHRESHOLD);
300  #undef _INIT  #undef _INIT
301    
302          /* Initialize some stuff to zero */          /* Initialize some stuff to zero */
         for(i=0; i<32; i++) rc->quant_count[i] = 0;  
   
303          for(i=0; i<3; i++) {          for(i=0; i<3; i++) {
304                  int j;                  int j;
305                  for (j=0; j<32; j++)                  for (j=0; j<32; j++) {
306                          rc->quant_error[i][j] = 0;                          rc->quant_error[i][j] = 0;
307                            rc->quant_count[i][j] = 0;
308                    }
309          }          }
310    
311          for (i=0; i<3; i++)          for (i=0; i<3; i++) rc->last_quant[i] = 0;
                 rc->last_quant[i] = 0;  
312    
313          rc->fq_error = 0;          rc->fq_error = 0;
314    
315          /* Count frames in the stats file */          /* Count frames (and intra frames) in the stats file, store the result into
316          if (!det_stats_length(rc, param->filename)) {           * the rc structure */
317                  DPRINTF(XVID_DEBUG_RC,"ERROR: fopen %s failed\n", param->filename);          if (statsfile_count_frames(rc, param->filename) == -1) {
318                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- ERROR: fopen %s failed\n", param->filename);
319                  free(rc);                  free(rc);
320                  return XVID_ERR_FAIL;                  return(XVID_ERR_FAIL);
321          }          }
322    
323      /* Allocate the stats' memory */      /* Allocate the stats' memory */
324          if ((rc->stats = malloc(rc->num_frames * sizeof(stat_t))) == NULL) {          if ((rc->stats = malloc(rc->num_frames * sizeof(twopass_stat_t))) == NULL) {
325          free(rc);          free(rc);
326          return XVID_ERR_MEMORY;                  return(XVID_ERR_MEMORY);
327      }      }
328    
329      /*          /* Allocate keyframes location's memory
330           * 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  
          */  
331          rc->keyframe_locations = malloc((rc->num_keyframes + 1) * sizeof(int));          rc->keyframe_locations = malloc((rc->num_keyframes + 1) * sizeof(int));
332          if (rc->keyframe_locations == NULL) {          if (rc->keyframe_locations == NULL) {
333                  free(rc->stats);                  free(rc->stats);
334                  free(rc);                  free(rc);
335                  return XVID_ERR_MEMORY;                  return(XVID_ERR_MEMORY);
336          }          }
337    
338          if (!load_stats(rc, param->filename)) {          /* Load the first pass stats */
339                  DPRINTF(XVID_DEBUG_RC,"ERROR: fopen %s failed\n", param->filename);          if (statsfile_load(rc, param->filename) == -1) {
340                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- ERROR: fopen %s failed\n", param->filename);
341                  free(rc->keyframe_locations);                  free(rc->keyframe_locations);
342                  free(rc->stats);                  free(rc->stats);
343                  free(rc);                  free(rc);
# Line 244  Line 345 
345          }          }
346    
347          /* Compute the target filesize */          /* Compute the target filesize */
348          if (rc->num_frames  < create->fbase/create->fincr) {          if (rc->param.bitrate<0) {
349                    /* if negative, bitrate equals the target (in kbytes) */
350                    rc->target = ((uint64_t)(-rc->param.bitrate)) * 1024;
351            } else if (rc->num_frames  < create->fbase/create->fincr) {
352                  /* 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 */
353                  rc->target = rc->param.bitrate / 8;                  rc->target = rc->param.bitrate / 8;
354          } else {          } else {
# Line 255  Line 359 
359                          ((uint64_t)create->fbase * 8);                          ((uint64_t)create->fbase * 8);
360          }          }
361    
362          DPRINTF(XVID_DEBUG_RC, "Frame rate: %d/%d (%ffps)\n",          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Frame rate: %d/%d (%ffps)\n",
363                          create->fbase, create->fincr,                          create->fbase, create->fincr,
364                          (double)create->fbase/(double)create->fincr);                          (double)create->fbase/(double)create->fincr);
365          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);
366          DPRINTF(XVID_DEBUG_RC, "Target bitrate: %ld\n", rc->param.bitrate);          if(rc->param.bitrate>=0)
367          DPRINTF(XVID_DEBUG_RC, "Target filesize: %lld\n", rc->target);                  DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Target bitrate: %ld\n", rc->param.bitrate);
368            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Target filesize: %lld\n", rc->target);
369    
370          /* Compensate the average frame overhead caused by the container */          /* Compensate the average frame overhead caused by the container */
371          rc->target -= rc->num_frames*rc->param.container_frame_overhead;          rc->target -= rc->num_frames*rc->param.container_frame_overhead;
372          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);
373          DPRINTF(XVID_DEBUG_RC, "Target filesize (after container compensation): %lld\n", rc->target);          if(rc->param.container_frame_overhead)
374                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- New target filesize after container compensation: %lld\n", rc->target);
375    
376          /*          /* When bitrate is not given it means it has been scaled by an external
377           * First data pre processing:           * application */
378            if (rc->param.bitrate) {
379                    /* Apply zone settings
380                     * - set rc->tot_quant which represents the total num of bytes spent in
381                     *   fixed quant zones
382                     * - set rc->tot_weighted which represents the total amount of bytes
383                     *   spent in normal or weighted zones in first pass (normal zones can
384                     *   be considered weight=1)
385                     * - set rc->tot_quant_invariant which represents the total num of bytes
386                     *   spent in fixed quant zones for headers */
387                    zone_process(rc, create);
388            } else {
389                    /* External scaling -- zones are ignored */
390                    for (i=0;i<rc->num_frames;i++) {
391                            rc->stats[i].zone_mode = XVID_ZONE_WEIGHT;
392                            rc->stats[i].weight = 1.0;
393                    }
394                    rc->tot_quant = 0;
395            }
396    
397            /* Gathers some information about first pass stats:
398           *  - finds the minimum frame length for each frame type during 1st pass.           *  - finds the minimum frame length for each frame type during 1st pass.
399           *     rc->min_size[]           *     rc->min_size[]
400           *  - determines the maximum frame length observed (no frame type distinction).           *  - determines the maximum frame length observed (no frame type distinction).
# Line 276  Line 402 
402           *  - count how many times each frame type has been used.           *  - count how many times each frame type has been used.
403           *     rc->count[]           *     rc->count[]
404           *  - total bytes used per frame type           *  - total bytes used per frame type
405           *     rc->total[]           *     rc->tot_length[]
406             *  - total bytes considered invariant between the 2 passes
407           *  - store keyframe location           *  - store keyframe location
408           *     rc->keyframe_locations[]           *     rc->keyframe_locations[]
409           */           */
410          pre_process0(rc);          first_pass_stats_prepare_data(rc);
411    
412          /*          /* If we have a user bitrate, it means it's an internal curve scaling */
          * When bitrate is not given it means it has been scaled by an external  
          * application  
          */  
413          if (rc->param.bitrate) {          if (rc->param.bitrate) {
414                  /* Apply zone settings */                  /* Perform internal curve scaling */
415                  zone_process(rc, create);                  first_pass_scale_curve_internal(rc);
                 /* Perform curve scaling */  
                 internal_scale(rc);  
         } else {  
                 /* External scaling -- zones are ignored */  
                 for (i=0;i<rc->num_frames;i++) {  
                         rc->stats[i].zone_mode = XVID_ZONE_WEIGHT;  
                         rc->stats[i].weight = 1.0;  
                 }  
                 rc->avg_weight = 1.0;  
                 rc->tot_quant = 0;  
416          }          }
417    
418          pre_process1(rc);          /* Apply advanced curve options, and compute some parameters in order to
419             * shape the curve in the BEFORE/AFTER pair of functions */
420            scaled_curve_apply_advanced_parameters(rc);
421    
422          *handle = rc;          *handle = rc;
423          return(0);          return(0);
# Line 313  Line 429 
429  static int  static int
430  rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy)  rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy)
431  {  {
432            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- target_total:%lld desired_total:%.2f (%.2f%%) actual_total:%.2f (%.2f%%)\n",
433                            rc->target,
434                            rc->desired_total,
435                            100*rc->desired_total/(double)rc->target,
436                            rc->real_total,
437                            100*rc->real_total/(double)rc->target);
438    
439      free(rc->keyframe_locations);      free(rc->keyframe_locations);
440      free(rc->stats);      free(rc->stats);
441          free(rc);          free(rc);
# Line 325  Line 448 
448  static int  static int
449  rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)  rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)
450  {  {
451          stat_t * s = &rc->stats[data->frame_num];          twopass_stat_t * s = &rc->stats[data->frame_num];
         int overflow;  
         int desired;  
452          double dbytes;          double dbytes;
         double curve_temp;  
453          double scaled_quant;          double scaled_quant;
454            double overflow;
455          int capped_to_max_framesize = 0;          int capped_to_max_framesize = 0;
456    
457          /*          /* This function is quite long but easy to understand. In order to simplify
458           * 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.  
          */  
459    
460          /* First case: Another plugin has already set a quantizer */          /* First case: Another plugin has already set a quantizer */
461      if (data->quant > 0)      if (data->quant > 0)
462                  return(0);                  return(0);
463    
464          /* Second case: We are in a Quant zone */          /* Second case: insufficent stats data
465             * We can't guess much what we should do, let core decide all alone */
466            if (data->frame_num >= rc->num_frames) {
467                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- stats file too short (now processing frame %d)",
468                            data->frame_num);
469                    return(0);
470            }
471    
472            /* Third case: We are in a Quant zone
473             * Quant zones must just ensure we use the same settings as first pass
474             * So set the quantizer and the type */
475          if (s->zone_mode == XVID_ZONE_QUANT) {          if (s->zone_mode == XVID_ZONE_QUANT) {
476                    /* Quant stuff */
477                  rc->fq_error += s->weight;                  rc->fq_error += s->weight;
478                  data->quant = (int)rc->fq_error;                  data->quant = (int)rc->fq_error;
479                  rc->fq_error -= data->quant;                  rc->fq_error -= data->quant;
480    
481                    /* The type stuff */
482                    data->type = s->type;
483    
484                    /* The only required data for AFTER step is this one for the overflow
485                     * control */
486                  s->desired_length = s->length;                  s->desired_length = s->length;
487    
488                  return(0);                  return(0);
489          }          }
490    
         /* 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;  
491    
492          /*          /*************************************************************************/
493           * The rc->overflow field represents the overflow in current scene (between two          /*************************************************************************/
494           * IFrames) so we must not forget to reset it if we are entering a new scene          /*************************************************************************/
          */  
         if (s->type == XVID_TYPE_IVOP)  
                 overflow = 0;  
495    
496          desired = s->scaled_length;          /*-------------------------------------------------------------------------
497             * Frame bit allocation first part
498             *
499             * First steps apply user settings, just like it is done in the theoritical
500             * scaled_curve_apply_advanced_parameters
501             *-----------------------------------------------------------------------*/
502    
503          dbytes = desired;          /* Set desired to what we are wanting to obtain for this frame */
504          if (s->type == XVID_TYPE_IVOP)          dbytes = (double)s->scaled_length;
                 dbytes += desired * rc->param.keyframe_boost / 100;  
         dbytes /= rc->movie_curve;  
505    
506          /*          /* IFrame user settings*/
507           * We are now entering in the hard part of the algo, it was first designed          if (s->type == XVID_TYPE_IVOP) {
508           * to work with i/pframes only streams, so the way it computes things is                  /* Keyframe boosting -- All keyframes benefit from it */
509           * 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];  
510    
511          /*  #if 0 /* ToDo: decide how to apply kfthresholding */
512           * 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);  
513          } else {          } else {
                 desired = (int)(rc->curve_comp_error * dbytes /  
                                                 rc->avg_length[XVID_TYPE_PVOP-1] / rc->param.bitrate_payback_delay);  
514    
515                  if (labs(desired) > fabs(rc->curve_comp_error)) {                  /* P/S/B frames must reserve some bits for iframe boosting */
516                          desired = (int)rc->curve_comp_error;                  dbytes *= rc->pb_iboost_tax_ratio;
517    
518                    /* Apply assymetric curve compression */
519                    if (rc->param.curve_compression_high || rc->param.curve_compression_low) {
520                            double assymetric_delta;
521    
522                            /* Compute the assymetric delta, this is computed before applying
523                             * the tax, as done in the pre_process function */
524                            if (dbytes > rc->avg_length[s->type-1])
525                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_high / 100.0;
526                            else
527                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_low  / 100.0;
528    
529                            /* Now we must apply the assymetric tax, else our curve compression
530                             * would not give a theoritical target size equal to what it is
531                             * expected */
532                            dbytes *= rc->assymetric_tax_ratio;
533    
534                            /* Now we can add the assymetric delta */
535                            dbytes += assymetric_delta;
536                  }                  }
537          }          }
538    
539          rc->curve_comp_error -= desired;          /* That is what we would like to have -- Don't put that chunk after
540             * overflow control, otherwise, overflow is counted twice and you obtain
541             * half sized bitrate sequences */
542            s->desired_length  = (int)dbytes;
543            rc->desired_total += dbytes;
544    
545          /* XXX: warning */          /*------------------------------------------------------------------------
546          curve_temp = 0;           * Frame bit allocation: overflow control part.
547             *
548             * Unlike the theoritical scaled_curve_apply_advanced_parameters, here
549             * it's real encoding and we need to make sure we don't go so far from
550             * what is our ideal scaled curve.
551             *-----------------------------------------------------------------------*/
552    
553            /* Compute the overflow we should compensate */
554            if (s->type != XVID_TYPE_IVOP || rc->overflow > 0) {
555                    double frametype_factor;
556                    double framesize_factor;
557    
558          if ((rc->param.curve_compression_high + rc->param.curve_compression_low) &&     s->type != XVID_TYPE_IVOP) {                  /* Take only the desired part of overflow */
559                    overflow = rc->overflow;
560    
561                  curve_temp = rc->curve_comp_scale;                  /* Factor that will take care to decrease the overflow applied
562                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                   * according to the importance of this frame type in term of
563                          curve_temp *= ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_high / 100.0);                   * overall size */
564                  } else {                  frametype_factor  = rc->count[XVID_TYPE_IVOP-1]*rc->avg_length[XVID_TYPE_IVOP-1];
565                          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];
566                  }                  frametype_factor += rc->count[XVID_TYPE_BVOP-1]*rc->avg_length[XVID_TYPE_BVOP-1];
567                    frametype_factor /= rc->count[s->type-1]*rc->avg_length[s->type-1];
568                    frametype_factor  = 1/frametype_factor;
569    
570                    /* Factor that will take care not to compensate too much for this frame
571                     * size */
572                    framesize_factor  = dbytes;
573                    framesize_factor /= rc->avg_length[s->type-1];
574    
575                  /*                  /* Treat only the overflow part concerned by this frame type and size */
576                   * End of code path for curve_temp, as told earlier, we are now                  overflow *= frametype_factor;
577                   * obliged to scale the value to a bframe one using the inverse  #if 0
578                   * ratio applied earlier                  /* Leave this one alone, as it impacts badly on quality */
579                   */                  overflow *= framesize_factor;
580                  if (s->type == XVID_TYPE_BVOP)  #endif
                         curve_temp *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
581    
582                  desired += (int)curve_temp;                  /* Apply the overflow strength imposed by the user */
583                  rc->curve_comp_error += curve_temp - (int)curve_temp;                  overflow *= (rc->param.overflow_control_strength/100.0f);
584          } else {          } else {
585                  /*                  /* no negative overflow applied in IFrames because:
586                   * End of code path for dbytes, as told earlier, we are now                   *  - their role is important as they're references for P/BFrames.
587                   * 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
588                   * ratio applied earlier                   *    much, this overflow may impact the next IFrame too much and generate
589                   */                   *    a sequence of poor quality frames */
590                  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;  
591          }          }
592    
593            /* Make sure we are not trying to compensate more overflow than we even have */
594            if (fabs(overflow) > fabs(rc->overflow))
595                    overflow = rc->overflow;
596    
597          /*          /* Make sure the overflow doesn't make the frame size to get out of the range
598           * We can't do bigger frames than first pass, this would be stupid as first           * [-max_degradation..+max_improvment] */
599           * 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) {
600           * many bytes and we would not not gain much quality.                  if(overflow <= dbytes)
601           */                          dbytes += dbytes * rc->param.max_overflow_improvement / 100;
602          if (desired > s->length) {                  else
603                  rc->curve_comp_error += desired - s->length;                          dbytes += overflow * rc->param.max_overflow_improvement / 100;
604                  desired = s->length;          } else if (overflow < - dbytes * rc->param.max_overflow_degradation / 100) {
605                    dbytes -= dbytes * rc->param.max_overflow_degradation / 100;
606          } else {          } else {
607                  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;  
608                          }                          }
                         desired = rc->min_length[s->type-1];  
                 }  
         }  
   
         s->desired_length = desired;  
   
609    
610          /*          /*-------------------------------------------------------------------------
611           * if this keyframe is too close to the next, reduce it's byte allotment           * Frame bit allocation last part:
612           * XXX: why do we do this after setting the desired length ?           *
613           */           * Cap frame length so we don't reach neither bigger frame sizes than first
614             * pass nor smaller than the allowed minimum.
615          if (s->type == XVID_TYPE_IVOP) {           *-----------------------------------------------------------------------*/
616                  int KFdistance = rc->keyframe_locations[rc->KF_idx] - rc->keyframe_locations[rc->KF_idx - 1];  
617    #ifdef PASS_SMALLER
618                  if (KFdistance < rc->param.kftreshold) {          if (dbytes > s->length) {
619                    dbytes = s->length;
620                          KFdistance -= rc->param.min_key_interval;          } else
621    #endif
622                    if (dbytes < rc->min_length[s->type-1]) {
623                    dbytes = rc->min_length[s->type-1];
624            } else if (dbytes > rc->max_length) {
625                    /* ToDo: this condition is always wrong as max_length == maximum frame
626                     * length of first pass, so the first condition already caps the frame
627                     * size... */
628                    capped_to_max_framesize = 1;
629                    dbytes = rc->max_length;
630                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- frame:%d Capped to maximum frame size\n",
631                                    data->frame_num);
632            }
633    
634                          if (KFdistance >= 0) {          /*------------------------------------------------------------------------
635                                  int KF_min_size;           * Desired frame length <-> quantizer mapping
636             *-----------------------------------------------------------------------*/
637    
638                                  KF_min_size = desired * (100 - rc->param.kfreduction) / 100;  #ifdef BQUANT_PRESCALE
639                                  if (KF_min_size < 1)          /* For bframes we prescale the quantizer to avoid too high quant scaling */
640                                          KF_min_size = 1;          if(s->type == XVID_TYPE_BVOP) {
641    
642                                  desired = KF_min_size + (desired - KF_min_size) * KFdistance /                  twopass_stat_t *b_ref = s;
                                         (rc->param.kftreshold - rc->param.min_key_interval);  
643    
644                                  if (desired < 1)                  /* Find the reference frame */
645                                          desired = 1;                  while(b_ref != &rc->stats[0] && b_ref->type == XVID_TYPE_BVOP)
646                          }                          b_ref--;
647                  }  
648                    /* Compute the original quant */
649                    s->quant  = 2*(100*s->quant - data->bquant_offset);
650                    s->quant += data->bquant_ratio - 1; /* to avoid rounding issues */
651                    s->quant  = s->quant/data->bquant_ratio - b_ref->quant;
652          }          }
653    #endif
654    
655          overflow = (int)((double)overflow * desired / rc->avg_length[XVID_TYPE_PVOP-1]);          /* Don't laugh at this very 'simple' quant<->size relationship, it
656             * proves to be acurate enough for our algorithm */
657          /* Reign in overflow with huge frames */          scaled_quant = (double)s->quant*(double)s->length/(double)dbytes;
658          if (labs(overflow) > labs(rc->overflow))  
659                  overflow = rc->overflow;  #ifdef COMPENSATE_FORMULA
660            /* We know xvidcore will apply the bframe formula again, so we compensate
661          /* Make sure overflow doesn't run away */           * it right now to make sure we would not apply it twice */
662          if (overflow > desired * rc->param.max_overflow_improvement / 100) {          if(s->type == XVID_TYPE_BVOP) {
                 desired += (overflow <= desired) ? desired * rc->param.max_overflow_improvement / 100 :  
                         overflow * rc->param.max_overflow_improvement / 100;  
         } else if (overflow < desired * rc->param.max_overflow_degradation / -100){  
                 desired += desired * rc->param.max_overflow_degradation / -100;  
         } else {  
                 desired += overflow;  
         }  
663    
664          /* Make sure we are not higher than desired frame size */                  twopass_stat_t *b_ref = s;
         if (desired > rc->max_length) {  
                 capped_to_max_framesize = 1;  
                 desired = rc->max_length;  
                 DPRINTF(XVID_DEBUG_RC,"[%i] Capped to maximum frame size\n",  
                                 data->frame_num);  
         }  
665    
666          /* Make sure to not scale below the minimum framesize */                  /* Find the reference frame */
667          if (desired < rc->min_length[s->type-1]) {                  while(b_ref != &rc->stats[0] && b_ref->type == XVID_TYPE_BVOP)
668                  desired = rc->min_length[s->type-1];                          b_ref--;
669                  DPRINTF(XVID_DEBUG_RC,"[%i] Capped to minimum frame size\n",  
670                                  data->frame_num);                  /* Compute the quant it would be if the core did not apply the bframe
671                     * formula */
672                    scaled_quant  = 100*scaled_quant - data->bquant_offset;
673                    scaled_quant += data->bquant_ratio - 1; /* to avoid rouding issues */
674                    scaled_quant /= data->bquant_ratio;
675          }          }
676    #endif
677    
678          /*          /* Quantizer has been scaled using floating point operations/results, we
679           * Don't laugh at this very 'simple' quant<->filesize relationship, it           * must cast it to integer */
          * proves to be acurate enough for our algorithm  
          */  
         scaled_quant = (double)s->quant*(double)s->length/(double)desired;  
   
         /*  
          * Quantizer has been scaled using floating point operations/results, we  
          * must cast it to integer  
          */  
680          data->quant = (int)scaled_quant;          data->quant = (int)scaled_quant;
681    
682          /* Let's clip the computed quantizer, if needed */          /* Let's clip the computed quantizer, if needed */
# Line 539  Line 684 
684                  data->quant = 1;                  data->quant = 1;
685          } else if (data->quant > 31) {          } else if (data->quant > 31) {
686                  data->quant = 31;                  data->quant = 31;
687          } else if (s->type != XVID_TYPE_IVOP) {          } else {
688    
689                  /*                  /* 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  
690                   * computed quantizer, do not loose quantizer decimal part that we                   * computed quantizer, do not loose quantizer decimal part that we
691                   * accumulate for later reuse when its sum represents a complete unit.                   * accumulate for later reuse when its sum represents a complete
692                   */                   * unit. */
693                  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;
694    
695                  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 699 
699                          rc->quant_error[s->type-1][data->quant] += 1.0;                          rc->quant_error[s->type-1][data->quant] += 1.0;
700                          data->quant--;                          data->quant--;
701                  }                  }
   
702          }          }
703    
704          /*          /* 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  
705           * possible +1 correction due to cumulated error. We can now safely clip           * possible +1 correction due to cumulated error. We can now safely clip
706           * the quantizer again with user's quant ranges. "Safely" means the Rate           * the quantizer again with user's quant ranges. "Safely" means the Rate
707           * Control could learn more about this quantizer, this knowledge is useful           * Control could learn more about this quantizer, this knowledge is useful
708           * 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,
709           * that's why we don't perform this clipping earlier.           * that's why we don't perform this clipping earlier. */
          */  
710          if (data->quant < data->min_quant[s->type-1]) {          if (data->quant < data->min_quant[s->type-1]) {
711                  data->quant = data->min_quant[s->type-1];                  data->quant = data->min_quant[s->type-1];
712          } else if (data->quant > data->max_quant[s->type-1]) {          } else if (data->quant > data->max_quant[s->type-1]) {
713                  data->quant = data->max_quant[s->type-1];                  data->quant = data->max_quant[s->type-1];
714          }          }
715    
716          /*          /* 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"  
717           * rule that makes |last_quant - new_quant| <= 2. This rule only applies           * rule that makes |last_quant - new_quant| <= 2. This rule only applies
718           * to predicted frames (P and B)           * to predicted frames (P and B) */
          */  
719          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) {
720    
721                  if (data->quant > rc->last_quant[s->type-1] + 2) {                  if (data->quant > rc->last_quant[s->type-1] + 2) {
722                          data->quant = rc->last_quant[s->type-1] + 2;                          data->quant = rc->last_quant[s->type-1] + 2;
723                          DPRINTF(XVID_DEBUG_RC,                          DPRINTF(XVID_DEBUG_RC,
724                                          "[%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",
725                                          data->frame_num);                                          data->frame_num);
726                  }                  }
727                  if (data->quant < rc->last_quant[s->type-1] - 2) {                  if (data->quant < rc->last_quant[s->type-1] - 2) {
728                          data->quant = rc->last_quant[s->type-1] - 2;                          data->quant = rc->last_quant[s->type-1] - 2;
729                          DPRINTF(XVID_DEBUG_RC,                          DPRINTF(XVID_DEBUG_RC,
730                                          "[%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",
731                                          data->frame_num);                                          data->frame_num);
732                  }                  }
733          }          }
734    
735          /*          /* We don't want to pollute the RC histerisis when our computed quant has
736           * 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  
          */  
737          if (capped_to_max_framesize == 0)          if (capped_to_max_framesize == 0)
738                  rc->last_quant[s->type-1] = data->quant;                  rc->last_quant[s->type-1] = data->quant;
739    
740            /* Don't forget to force 1st pass frame type ;-) */
741            data->type = s->type;
742    
743          return 0;          return 0;
744  }  }
745    
# Line 610  Line 750 
750  rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)  rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)
751  {  {
752          const char frame_type[4] = { 'i', 'p', 'b', 's'};          const char frame_type[4] = { 'i', 'p', 'b', 's'};
753          stat_t * s = &rc->stats[data->frame_num];          twopass_stat_t * s = &rc->stats[data->frame_num];
754    
755          /* Insufficent stats data */          /* Insufficent stats data */
756      if (data->frame_num >= rc->num_frames)      if (data->frame_num >= rc->num_frames)
757          return 0;          return 0;
758    
759      rc->quant_count[data->quant]++;          /* Update the quantizer counter */
760            rc->quant_count[s->type-1][data->quant]++;
761    
762            /* Update the frame type overflow */
763      if (data->type == XVID_TYPE_IVOP) {      if (data->type == XVID_TYPE_IVOP) {
764          int kfdiff = (rc->keyframe_locations[rc->KF_idx] -      rc->keyframe_locations[rc->KF_idx - 1]);                  int kfdiff = 0;
765    
766                    if(rc->KF_idx != rc->num_frames -1) {
767                            kfdiff  = rc->keyframe_locations[rc->KF_idx+1];
768                            kfdiff -= rc->keyframe_locations[rc->KF_idx];
769                    }
770    
771                    /* Flush Keyframe overflow accumulator */
772          rc->overflow += rc->KFoverflow;          rc->overflow += rc->KFoverflow;
773    
774                    /* Store the frame overflow to the keyframe accumulator */
775          rc->KFoverflow = s->desired_length - data->length;          rc->KFoverflow = s->desired_length - data->length;
776    
777          if (kfdiff > 1) {  // non-consecutive keyframes                  if (kfdiff > 1) {
778                            /* Non-consecutive keyframes case:
779                             * We can then divide this total keyframe overflow into equal parts
780                             * that we will distribute into regular overflow at each frame
781                             * between the sequence bounded by two IFrames */
782              rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);              rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);
783          }else{ // consecutive keyframes                  } else {
784                            /* Consecutive keyframes case:
785                             * Flush immediatly the keyframe overflow and reset keyframe
786                             * overflow */
787                          rc->overflow += rc->KFoverflow;                          rc->overflow += rc->KFoverflow;
788                          rc->KFoverflow = 0;                          rc->KFoverflow = 0;
789                          rc->KFoverflow_partial = 0;                          rc->KFoverflow_partial = 0;
790          }          }
791          rc->KF_idx++;          rc->KF_idx++;
792      } else {      } else {
793          // distribute part of the keyframe overflow                  /* Accumulate the frame overflow */
794          rc->overflow += s->desired_length - data->length + rc->KFoverflow_partial;                  rc->overflow += s->desired_length - data->length;
795    
796                    /* Distribute part of the keyframe overflow */
797                    rc->overflow += rc->KFoverflow_partial;
798    
799                    /* Don't forget to substract that same amount from the total keyframe
800                     * overflow */
801          rc->KFoverflow -= rc->KFoverflow_partial;          rc->KFoverflow -= rc->KFoverflow_partial;
802      }      }
803    
804          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);
805            rc->real_total += data->length;
806    
807            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",
808                          data->frame_num,                          data->frame_num,
809                          frame_type[data->type-1],                          frame_type[data->type-1],
810                          data->quant,                          data->quant,
811                          s->length,                          s->length,
812                          s->scaled_length,                          s->scaled_length,
                         data->length,  
813                          s->desired_length,                          s->desired_length,
814                            s->desired_length - s->error,
815                            -s->error,
816                          rc->overflow);                          rc->overflow);
817    
818      return(0);      return(0);
# Line 655  Line 822 
822   * Helper functions definition   * Helper functions definition
823   ****************************************************************************/   ****************************************************************************/
824    
825    /* Default buffer size for reading lines */
826  #define BUF_SZ   1024  #define BUF_SZ   1024
 #define MAX_COLS 5  
827    
828  /* open stats file, and count num frames */  /* Helper functions for reading/parsing the stats file */
829    static char *skipspaces(char *string);
830    static int iscomment(char *string);
831    static char *readline(FILE *f);
832    
833    /* This function counts the number of frame entries in the stats file
834     * It also counts the number of I Frames */
835  static int  static int
836  det_stats_length(rc_2pass2_t * rc, char * filename)  statsfile_count_frames(rc_2pass2_t * rc, char * filename)
837  {  {
838      FILE * f;      FILE * f;
839      int n, ignore;          char *line;
840      char type;          int lines;
841    
842      rc->num_frames = 0;      rc->num_frames = 0;
843      rc->num_keyframes = 0;      rc->num_keyframes = 0;
844    
845      if ((f = fopen(filename, "rt")) == NULL)          if ((f = fopen(filename, "rb")) == NULL)
846          return 0;                  return(-1);
847    
848      while((n = fscanf(f, "%c %d %d %d %d %d %d\n",          lines = 0;
849          &type, &ignore, &ignore, &ignore, &ignore, &ignore, &ignore)) != EOF) {          while ((line = readline(f)) != NULL) {
850          if (type == 'i') {  
851              rc->num_frames++;                  char *ptr;
852                    char type;
853                    int fields;
854    
855                    lines++;
856    
857                    /* We skip spaces */
858                    ptr = skipspaces(line);
859    
860                    /* Skip coment lines or empty lines */
861                    if(iscomment(ptr) || *ptr == '\0') {
862                            free(line);
863                            continue;
864                    }
865    
866                    /* Read the stat line from buffer */
867                    fields = sscanf(ptr, "%c", &type);
868    
869                    /* Valid stats files have at least 7 fields */
870                    if (fields == 1) {
871                            switch(type) {
872                            case 'i':
873                            case 'I':
874              rc->num_keyframes++;              rc->num_keyframes++;
875          }else if (type == 'p' || type == 'b' || type == 's') {                          case 'p':
876                            case 'P':
877                            case 'b':
878                            case 'B':
879                            case 's':
880                            case 'S':
881              rc->num_frames++;              rc->num_frames++;
882                                    break;
883                            default:
884                                    DPRINTF(XVID_DEBUG_RC,
885                                                    "[xvid rc] -- WARNING: L%d unknown frame type used (%c).\n",
886                                                    lines, type);
887          }          }
888                    } else {
889                                    DPRINTF(XVID_DEBUG_RC,
890                                                    "[xvid rc] -- WARNING: L%d misses some stat fields (%d).\n",
891                                                    lines, 7-fields);
892      }      }
893    
894                    /* Free the line buffer */
895                    free(line);
896            }
897    
898            /* We are done with the file */
899      fclose(f);      fclose(f);
900    
901      return 1;          return(0);
902  }  }
903    
904  /* open stats file(s) and read into rc->stats array */  /* open stats file(s) and read into rc->stats array */
   
905  static int  static int
906  load_stats(rc_2pass2_t *rc, char * filename)  statsfile_load(rc_2pass2_t *rc, char * filename)
907  {  {
908      FILE * f;      FILE * f;
909      int i, not_scaled;          int processed_entries;
   
910    
911      if ((f = fopen(filename, "rt"))==NULL)          /* Opens the file */
912          return 0;          if ((f = fopen(filename, "rb"))==NULL)
913                    return(-1);
914    
915      i = 0;          processed_entries = 0;
916          not_scaled = 0;          while(processed_entries < rc->num_frames) {
     while(i < rc->num_frames) {  
         stat_t * s = &rc->stats[i];  
         int n;  
917          char type;          char type;
918                    int fields;
919                    twopass_stat_t * s = &rc->stats[processed_entries];
920                    char *line, *ptr;
921    
922                    /* Read the line from the file */
923                    if((line = readline(f)) == NULL)
924                            break;
925    
926                    /* We skip spaces */
927                    ptr = skipspaces(line);
928    
929                    /* Skip comment lines or empty lines */
930                    if(iscomment(ptr) || *ptr == '\0') {
931                            free(line);
932                            continue;
933                    }
934    
935                    /* Reset this field that is optional */
936                  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;  
                 }  
937    
938          if (type == 'i') {                  /* Convert the fields */
939                    fields = sscanf(ptr,
940                                                    "%c %d %d %d %d %d %d %d\n",
941                                                    &type,
942                                                    &s->quant,
943                                                    &s->blks[0], &s->blks[1], &s->blks[2],
944                                                    &s->length, &s->invariant /* not really yet */,
945                                                    &s->scaled_length);
946    
947                    /* Free line buffer, we don't need it anymore */
948                    free(line);
949    
950                    /* Fail silently, this has probably been warned in
951                     * statsfile_count_frames */
952                    if(fields != 7 && fields != 8)
953                            continue;
954    
955                    /* Convert frame type and compute the invariant length part */
956                    switch(type) {
957                    case 'i':
958                    case 'I':
959              s->type = XVID_TYPE_IVOP;              s->type = XVID_TYPE_IVOP;
960          }else if (type == 'p' || type == 's') {                          s->invariant /= INVARIANT_HEADER_PART_IVOP;
961                            break;
962                    case 'p':
963                    case 'P':
964                    case 's':
965                    case 'S':
966              s->type = XVID_TYPE_PVOP;              s->type = XVID_TYPE_PVOP;
967          }else if (type == 'b') {                          s->invariant /= INVARIANT_HEADER_PART_PVOP;
968                            break;
969                    case 'b':
970                    case 'B':
971              s->type = XVID_TYPE_BVOP;              s->type = XVID_TYPE_BVOP;
972          }else{  /* unknown type */                          s->invariant /= INVARIANT_HEADER_PART_BVOP;
973              DPRINTF(XVID_DEBUG_RC, "unknown stats frame type; assuming pvop\n");                          break;
974              s->type = XVID_TYPE_PVOP;                  default:
975                            /* Same as before, fail silently */
976                            continue;
977          }          }
978    
979          i++;                  /* Ok it seems it's been processed correctly */
980                    processed_entries++;
981      }      }
982    
983      rc->num_frames = i;          /* Close the file */
   
984          fclose(f);          fclose(f);
985    
986      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);  
     }  
987  }  }
 #endif  
988    
989  /* pre-process the statistics data  /* pre-process the statistics data
990      - for each type, count, tot_length, min_length, max_length   * - for each type, count, tot_length, min_length, max_length
991      - set keyframes_locations   * - set keyframes_locations, tot_prescaled */
 */  
   
992  static void  static void
993  pre_process0(rc_2pass2_t * rc)  first_pass_stats_prepare_data(rc_2pass2_t * rc)
994  {  {
995      int i,j;      int i,j;
996    
997          /*          /* *rc fields initialization
          * *rc fields initialization  
998           * 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
999           *     with real values of the 1pass           *     with real values of the 1pass */
          */  
1000           for (i=0; i<3; i++) {           for (i=0; i<3; i++) {
1001                  rc->count[i]=0;                  rc->count[i]=0;
1002                  rc->tot_length[i] = 0;                  rc->tot_length[i] = 0;
1003                    rc->tot_invariant[i] = 0;
1004                  rc->min_length[i] = INT_MAX;                  rc->min_length[i] = INT_MAX;
1005      }      }
1006    
1007          rc->max_length = INT_MIN;          rc->max_length = INT_MIN;
1008            rc->tot_weighted = 0;
1009    
1010          /*          /* Loop through all frames and find/compute all the stuff this function
1011           * Loop through all frames and find/compute all the stuff this function           * is supposed to do */
          * is supposed to do  
          */  
1012          for (i=j=0; i<rc->num_frames; i++) {          for (i=j=0; i<rc->num_frames; i++) {
1013                  stat_t * s = &rc->stats[i];                  twopass_stat_t * s = &rc->stats[i];
1014    
1015                  rc->count[s->type-1]++;                  rc->count[s->type-1]++;
1016                  rc->tot_length[s->type-1] += s->length;                  rc->tot_length[s->type-1] += s->length;
1017                    rc->tot_invariant[s->type-1] += s->invariant;
1018                    if (s->zone_mode != XVID_ZONE_QUANT)
1019                            rc->tot_weighted += (int)(s->weight*(s->length - s->invariant));
1020    
1021                  if (s->length < rc->min_length[s->type-1]) {                  if (s->length < rc->min_length[s->type-1]) {
1022                          rc->min_length[s->type-1] = s->length;                          rc->min_length[s->type-1] = s->length;
# Line 793  Line 1032 
1032                  }                  }
1033          }          }
1034    
1035          /*          /* NB:
          * Nota Bene:  
1036           * The "per sequence" overflow system considers a natural sequence to be           * The "per sequence" overflow system considers a natural sequence to be
1037           * 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
1038           * 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
1039           * frame to appear in the keyframe locations array.           * frame to appear in the keyframe locations array. */
          */  
1040      rc->keyframe_locations[j] = i;      rc->keyframe_locations[j] = i;
1041    
1042          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]);
1043          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]);
1044          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]);
1045  }  }
1046    
1047  /* calculate zone weight "center" */  /* calculate zone weight "center" */
   
1048  static void  static void
1049  zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)  zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)
1050  {  {
1051      int i,j;      int i,j;
1052      int n = 0;      int n = 0;
1053    
     rc->avg_weight = 0.0;  
1054      rc->tot_quant = 0;      rc->tot_quant = 0;
1055            rc->tot_quant_invariant = 0;
1056    
1057      if (create->num_zones == 0) {      if (create->num_zones == 0) {
1058          for (j = 0; j < rc->num_frames; j++) {          for (j = 0; j < rc->num_frames; j++) {
1059              rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;              rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1060              rc->stats[j].weight = 1.0;              rc->stats[j].weight = 1.0;
1061          }          }
         rc->avg_weight += rc->num_frames * 1.0;  
1062          n += rc->num_frames;          n += rc->num_frames;
1063      }      }
1064    
# Line 833  Line 1067 
1067    
1068          int next = (i+1<create->num_zones) ? create->zones[i+1].frame : rc->num_frames;          int next = (i+1<create->num_zones) ? create->zones[i+1].frame : rc->num_frames;
1069    
1070                    /* Zero weight make no sense */
1071                    if (create->zones[i].increment == 0) create->zones[i].increment = 1;
1072                    /* And obviously an undetermined infinite makes even less sense */
1073                    if (create->zones[i].base == 0) create->zones[i].base = 1;
1074    
1075          if (i==0 && create->zones[i].frame > 0) {          if (i==0 && create->zones[i].frame > 0) {
1076              for (j = 0; j < create->zones[i].frame && j < rc->num_frames; j++) {              for (j = 0; j < create->zones[i].frame && j < rc->num_frames; j++) {
1077                  rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;                  rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1078                  rc->stats[j].weight = 1.0;                  rc->stats[j].weight = 1.0;
1079              }              }
             rc->avg_weight += create->zones[i].frame * 1.0;  
1080              n += create->zones[i].frame;              n += create->zones[i].frame;
1081          }          }
1082    
# Line 848  Line 1086 
1086                  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;
1087              }              }
1088              next -= create->zones[i].frame;              next -= create->zones[i].frame;
             rc->avg_weight += (double)(next * create->zones[i].increment) / (double)create->zones[i].base;  
1089              n += next;              n += next;
1090          }else{  // XVID_ZONE_QUANT                  } else{  /* XVID_ZONE_QUANT */
1091              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++ ) {
1092                  rc->stats[j].zone_mode = XVID_ZONE_QUANT;                  rc->stats[j].zone_mode = XVID_ZONE_QUANT;
1093                  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;
1094                  rc->tot_quant += rc->stats[j].length;                  rc->tot_quant += rc->stats[j].length;
1095                                    rc->tot_quant_invariant += rc->stats[j].invariant;
1096              }              }
1097          }          }
1098      }      }
     rc->avg_weight = n>0 ? rc->avg_weight/n : 1.0;  
   
     DPRINTF(XVID_DEBUG_RC, "center_weight: %f (for %i frames);   fixed_bytes: %i\n", rc->avg_weight, n, rc->tot_quant);  
1099  }  }
1100    
1101    
1102  /* scale the curve */  /* scale the curve */
   
1103  static void  static void
1104  internal_scale(rc_2pass2_t *rc)  first_pass_scale_curve_internal(rc_2pass2_t *rc)
1105  {  {
1106          int64_t target  = rc->target - rc->tot_quant;          int64_t target;
1107          int64_t pass1_length = rc->tot_length[0] + rc->tot_length[1] + rc->tot_length[2] - rc->tot_quant;          int64_t total_invariant;
1108          double scaler;          double scaler;
1109          int i, num_MBs;          int i, num_MBs;
         int min_size[3];  
1110    
1111          /* Let's compute a linear scaler in order to perform curve scaling */          /* We only scale texture data ! */
1112          scaler = (double)target / (double)pass1_length;          total_invariant  = rc->tot_invariant[XVID_TYPE_IVOP-1];
1113            total_invariant += rc->tot_invariant[XVID_TYPE_PVOP-1];
1114            total_invariant += rc->tot_invariant[XVID_TYPE_BVOP-1];
1115            /* don't forget to substract header bytes used in quant zones, otherwise we
1116             * counting them twice */
1117            total_invariant -= rc->tot_quant_invariant;
1118    
1119            /* We remove the bytes used by the fixed quantizer zones during first pass
1120             * with the same quants, so we know very precisely how much that
1121             * represents */
1122            target  = rc->target;
1123            target -= rc->tot_quant;
1124    
1125          if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {          /* Let's compute a linear scaler in order to perform curve scaling */
1126                  DPRINTF(XVID_DEBUG_RC, "WARNING: Undersize detected\n");          scaler = (double)(target - total_invariant) / (double)(rc->tot_weighted);
         scaler = 1.0;  
         }  
1127    
1128      DPRINTF(XVID_DEBUG_RC,          /* Compute min frame lengths (for each frame type) according to the number
1129                          "Before correction: target=%i, tot_length=%i, scaler=%f\n",           * of MBs. We sum all block type counters of frame 0, this gives us the
1130                          (int)target, (int)pass1_length, scaler);           * number of MBs.
1131             *
1132             * We compare these hardcoded values with observed values in first pass
1133             * (determined in pre_process0).Then we keep the real minimum. */
1134    
1135          /*          /* Number of MBs */
1136           * Compute min frame lengths (for each frame type) according to the number          num_MBs  = rc->stats[0].blks[0];
1137           * of MBs. We sum all blocks count from frame 0 (should be an IFrame, so          num_MBs += rc->stats[0].blks[1];
1138           * blocks[0] should be enough) to know how many MBs there are.          num_MBs += rc->stats[0].blks[2];
1139           */  
1140          num_MBs = rc->stats[0].blks[0] + rc->stats[0].blks[1] + rc->stats[0].blks[2];          /* Minimum for I frames */
1141          min_size[0] = ((num_MBs*22) + 240) / 8;          if(rc->min_length[XVID_TYPE_IVOP-1] > ((num_MBs*22) + 240) / 8)
1142          min_size[1] = ((num_MBs)    + 88)  / 8;                  rc->min_length[XVID_TYPE_IVOP-1] = ((num_MBs*22) + 240) / 8;
1143          min_size[2] = 8;  
1144            /* Minimum for P/S frames */
1145            if(rc->min_length[XVID_TYPE_PVOP-1] > ((num_MBs) + 88)  / 8)
1146                    rc->min_length[XVID_TYPE_PVOP-1] = ((num_MBs) + 88)  / 8;
1147    
1148            /* Minimum for B frames */
1149            if(rc->min_length[XVID_TYPE_BVOP-1] > 8)
1150                    rc->min_length[XVID_TYPE_BVOP-1] = 8;
1151    
1152          /*          /* Perform an initial scale pass.
1153           * Perform an initial scale pass.           *
1154           * If a frame size is scaled underneath our hardcoded minimums, then we           * If a frame size is scaled underneath our hardcoded minimums, then we
1155           * force the frame size to the minimum, and deduct the original & scaled           * force the frame size to the minimum, and deduct the original & scaled
1156           * frame length from the original and target total lengths           * frame length from the original and target total lengths */
          */  
1157          for (i=0; i<rc->num_frames; i++) {          for (i=0; i<rc->num_frames; i++) {
1158                  stat_t * s = &rc->stats[i];                  twopass_stat_t * s = &rc->stats[i];
1159                  int len;                  int len;
1160    
1161                    /* No need to scale frame length for which a specific quantizer is
1162                     * specified thanks to zones */
1163          if (s->zone_mode == XVID_ZONE_QUANT) {          if (s->zone_mode == XVID_ZONE_QUANT) {
1164              s->scaled_length = s->length;              s->scaled_length = s->length;
1165                          continue;                          continue;
1166                  }                  }
1167    
1168                  /* Compute the scaled length */                  /* Compute the scaled length -- only non invariant data length is scaled */
1169                  len = (int)((double)s->length * scaler * s->weight / rc->avg_weight);                  len = s->invariant + (int)((double)(s->length-s->invariant) * scaler * s->weight);
1170    
1171                  /* Compare with the computed minimum */                  /* Compare with the computed minimum */
1172                  if (len < min_size[s->type-1]) {                  if (len < rc->min_length[s->type-1]) {
1173                          /* force frame size to our computed minimum */                          /* This is a 'forced size' frame, set its frame size to the
1174                          s->scaled_length = min_size[s->type-1];                           * computed minimum */
1175                            s->scaled_length = rc->min_length[s->type-1];
1176    
1177                            /* Remove both scaled and original size from their respective
1178                             * total counters, as we prepare a second pass for 'regular'
1179                             * frames */
1180                          target -= s->scaled_length;                          target -= s->scaled_length;
                         pass1_length -= s->length;  
1181                  } else {                  } else {
1182                          /* Do nothing for now, we'll scale this later */                          /* Do nothing for now, we'll scale this later */
1183                          s->scaled_length = 0;                          s->scaled_length = 0;
1184                  }                  }
1185          }          }
1186    
1187          /* Correct the scaler for all non forced frames */          /* The first pass on data substracted all 'forced size' frames from the
1188          scaler = (double)target / (double)pass1_length;           * total counters. Now, it's possible to scale the 'regular' frames. */
1189    
1190          /* Detect undersizing */          /* Scaling factor for 'regular' frames */
1191      if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {          scaler = (double)(target - total_invariant) / (double)(rc->tot_weighted);
                 DPRINTF(XVID_DEBUG_RC, "WARNING: Undersize detected\n");  
                 scaler = 1.0;  
         }  
   
         DPRINTF(XVID_DEBUG_RC,  
                         "After correction: target=%i, tot_length=%i, scaler=%f\n",  
                         (int)target, (int)pass1_length, scaler);  
1192    
1193          /* Do another pass with the new scaler */          /* Do another pass with the new scaler */
1194          for (i=0; i<rc->num_frames; i++) {          for (i=0; i<rc->num_frames; i++) {
1195                  stat_t * s = &rc->stats[i];                  twopass_stat_t * s = &rc->stats[i];
1196    
1197                  /* Ignore frame with forced frame sizes */                  /* Ignore frame with forced frame sizes */
1198                  if (s->scaled_length == 0)                  if (s->scaled_length == 0)
1199                          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);
1200          }          }
1201    
1202            /* Job done */
1203            return;
1204  }  }
1205    
1206    /* Apply all user settings to the scaled curve
1207     * This implies:
1208     *   keyframe boosting
1209     *   high/low compression */
1210  static void  static void
1211  pre_process1(rc_2pass2_t * rc)  scaled_curve_apply_advanced_parameters(rc_2pass2_t * rc)
1212  {  {
1213      int i;      int i;
1214      double total1, total2;          int64_t ivop_boost_total;
     uint64_t ivop_boost_total;  
1215    
1216      ivop_boost_total = 0;          /* Reset the rate controller (per frame type) total byte counters */
1217      rc->curve_comp_error = 0;          for (i=0; i<3; i++) rc->tot_scaled_length[i] = 0;
1218    
1219      for (i=0; i<3; i++) {          /* Compute total bytes for each frame type */
1220          rc->tot_scaled_length[i] = 0;          for (i=0; i<rc->num_frames;i++) {
1221                    twopass_stat_t *s = &rc->stats[i];
1222                    rc->tot_scaled_length[s->type-1] += s->scaled_length;
1223      }      }
1224    
1225            /* First we compute the total amount of bits needed, as being described by
1226             * the scaled distribution. During this pass over the complete stats data,
1227             * we see how much bits two user settings will get/give from/to p&b frames:
1228             *  - keyframe boosting
1229             *  - keyframe distance penalty */
1230            rc->KF_idx = 0;
1231            ivop_boost_total = 0;
1232      for (i=0; i<rc->num_frames; i++) {      for (i=0; i<rc->num_frames; i++) {
1233          stat_t * s = &rc->stats[i];                  twopass_stat_t * s = &rc->stats[i];
   
         rc->tot_scaled_length[s->type-1] += s->scaled_length;  
1234    
1235                    /* Some more work is needed for I frames */
1236          if (s->type == XVID_TYPE_IVOP) {          if (s->type == XVID_TYPE_IVOP) {
1237              ivop_boost_total += s->scaled_length * rc->param.keyframe_boost / 100;                          int ivop_boost;
1238    
1239                            /* Accumulate bytes needed for keyframe boosting */
1240                            ivop_boost = s->scaled_length*rc->param.keyframe_boost/100;
1241    
1242    #if 0 /* ToDo: decide how to apply kfthresholding */
1243    #endif
1244                            /* If the frame size drops under the minimum length, then cap ivop_boost */
1245                            if (ivop_boost + s->scaled_length < rc->min_length[XVID_TYPE_IVOP-1])
1246                                    ivop_boost = rc->min_length[XVID_TYPE_IVOP-1] - s->scaled_length;
1247    
1248                            /* Accumulate the ivop boost */
1249                            ivop_boost_total += ivop_boost;
1250    
1251                            /* Don't forget to update the keyframe index */
1252                            rc->KF_idx++;
1253          }          }
1254      }      }
1255    
1256      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
1257                                          (rc->tot_scaled_length[XVID_TYPE_PVOP-1] + rc->tot_scaled_length[XVID_TYPE_BVOP-1]));           *
1258             * This ratio has to be applied to p/b/s frames in order to reserve
1259             * additional bits for keyframes (keyframe boosting) or if too much
1260             * keyframe distance is applied, bits retrieved from the keyframes.
1261             *
1262             * ie pb_length *= rc->pb_iboost_tax_ratio;
1263             *
1264             *    gives the ideal length of a p/b frame */
1265    
1266            /* Compute the total length of p/b/s frames (temporary storage into
1267             * movie_curve) */
1268            rc->pb_iboost_tax_ratio  = (double)rc->tot_scaled_length[XVID_TYPE_PVOP-1];
1269            rc->pb_iboost_tax_ratio += (double)rc->tot_scaled_length[XVID_TYPE_BVOP-1];
1270    
1271            /* Compute the ratio described above
1272             *     taxed_total = sum(0, n, tax*scaled_length)
1273             * <=> taxed_total = tax.sum(0, n, scaled_length)
1274             * <=> tax = taxed_total / original_total */
1275            rc->pb_iboost_tax_ratio =
1276                    (rc->pb_iboost_tax_ratio - ivop_boost_total) /
1277                    rc->pb_iboost_tax_ratio;
1278    
1279            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- IFrame boost tax ratio:%.2f\n",
1280                            rc->pb_iboost_tax_ratio);
1281    
1282            /* Compute the average size of frames per frame type */
1283      for(i=0; i<3; i++) {      for(i=0; i<3; i++) {
1284          if (rc->count[i] == 0 || rc->movie_curve == 0) {                  /* Special case for missing type or weird case */
1285                    if (rc->count[i] == 0 || rc->pb_iboost_tax_ratio == 0) {
1286              rc->avg_length[i] = 1;              rc->avg_length[i] = 1;
1287          }else{          }else{
1288              rc->avg_length[i] = rc->tot_scaled_length[i] / rc->count[i] / rc->movie_curve;                          rc->avg_length[i] = rc->tot_scaled_length[i];
1289          }  
1290                            if (i == (XVID_TYPE_IVOP-1)) {
1291                                    /* I Frames total has to be added the boost total */
1292                                    rc->avg_length[i] += ivop_boost_total;
1293                            } else {
1294                                    /* P/B frames has to taxed */
1295                                    rc->avg_length[i] *= rc->pb_iboost_tax_ratio;
1296      }      }
1297    
1298      /* --- */                          /* Finally compute the average frame size */
1299                            rc->avg_length[i] /= (double)rc->count[i];
1300                    }
1301            }
1302    
1303      total1=total2=0;          /* Assymetric curve compression */
1304            if (rc->param.curve_compression_high || rc->param.curve_compression_low) {
1305                    double symetric_total;
1306                    double assymetric_delta_total;
1307    
1308                    /* Like I frame boosting, assymetric curve compression modifies the total
1309                     * amount of needed bits, we must compute the ratio so we can prescale
1310                     lengths */
1311                    symetric_total = 0;
1312                    assymetric_delta_total = 0;
1313      for (i=0; i<rc->num_frames; i++) {      for (i=0; i<rc->num_frames; i++) {
1314          stat_t * s = &rc->stats[i];                          double assymetric_delta;
1315                            double dbytes;
1316                            twopass_stat_t * s = &rc->stats[i];
1317    
1318                            /* I Frames are not concerned by assymetric scaling */
1319                            if (s->type == XVID_TYPE_IVOP)
1320                                    continue;
1321    
1322          if (s->type != XVID_TYPE_IVOP) {                          /* During the real run, we would have to apply the iboost tax */
1323              double dbytes,dbytes2;                          dbytes = s->scaled_length * rc->pb_iboost_tax_ratio;
1324    
1325              dbytes = s->scaled_length / rc->movie_curve;                          /* Update the symmetric curve compression total */
1326              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];  
1327    
1328                          if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                          /* Apply assymetric curve compression */
1329                                  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])
1330                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * (double)rc->param.curve_compression_high / 100.0f;
1331                            else
1332                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * (double)rc->param.curve_compression_low  / 100.0f;
1333    
1334                            /* Cap to the minimum frame size if needed */
1335                            if (dbytes + assymetric_delta < rc->min_length[s->type-1])
1336                                    assymetric_delta = rc->min_length[s->type-1] - dbytes;
1337    
1338                            /* Accumulate after assymetric curve compression */
1339                            assymetric_delta_total += assymetric_delta;
1340                    }
1341    
1342                    /* Compute the tax that all p/b frames have to pay in order to respect the
1343                     * bit distribution changes that the assymetric compression curve imposes
1344                     * We want assymetric_total = sum(0, n-1, tax.scaled_length)
1345                     *      ie assymetric_total = ratio.sum(0, n-1, scaled_length)
1346                     *         ratio = assymetric_total / symmetric_total */
1347                    rc->assymetric_tax_ratio = ((double)symetric_total - (double)assymetric_delta_total) / (double)symetric_total;
1348                          } else {                          } else {
1349                                  dbytes2 = ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_low / 100.0);                  rc->assymetric_tax_ratio = 1.0f;
1350                          }                          }
1351    
1352              if (s->type == XVID_TYPE_BVOP) {          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Assymetric tax ratio:%.2f\n", rc->assymetric_tax_ratio);
1353                              dbytes2 *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
1354                              if (dbytes2 < rc->min_length[XVID_TYPE_BVOP-1])          /* Last bits that need to be reset */
1355                                      dbytes2 = rc->min_length[XVID_TYPE_BVOP-1];          rc->overflow = 0;
1356              }else{          rc->KFoverflow = 0;
1357                              if (dbytes2 < rc->min_length[XVID_TYPE_PVOP-1])          rc->KFoverflow_partial = 0;
1358                                      dbytes2 = rc->min_length[XVID_TYPE_PVOP-1];          rc->KF_idx = 0;
1359            rc->desired_total = 0;
1360            rc->real_total = 0;
1361    
1362            /* Job done */
1363            return;
1364              }              }
1365              total2 += dbytes2;  
1366    /*****************************************************************************
1367     * Still more low level stuff (nothing to do with stats treatment)
1368     ****************************************************************************/
1369    
1370    /* This function returns an allocated string containing a complete line read
1371     * from the file starting at the current position */
1372    static char *
1373    readline(FILE *f)
1374    {
1375            char *buffer = NULL;
1376            int buffer_size = 0;
1377            int pos = 0;
1378    
1379            do {
1380                    int c;
1381    
1382                    /* Read a character from the stream */
1383                    c = fgetc(f);
1384    
1385                    /* Is that EOF or new line ? */
1386                    if(c == EOF || c == '\n')
1387                            break;
1388    
1389                    /* Do we have to update buffer ? */
1390                    if(pos >= buffer_size - 1) {
1391                            buffer_size += BUF_SZ;
1392                            buffer = (char*)realloc(buffer, buffer_size);
1393                            if (buffer == NULL)
1394                                    return(NULL);
1395          }          }
1396    
1397                    buffer[pos] = c;
1398                    pos++;
1399            } while(1);
1400    
1401            /* Read \n or EOF */
1402            if (buffer == NULL) {
1403                    /* EOF, so we reached the end of the file, return NULL */
1404                    if(feof(f))
1405                            return(NULL);
1406    
1407                    /* Just an empty line with just a newline, allocate a 1 byte buffer to
1408                     * store a zero length string */
1409                    buffer = (char*)malloc(1);
1410                    if(buffer == NULL)
1411                            return(NULL);
1412      }      }
1413    
1414      rc->curve_comp_scale = total1 / total2;          /* Zero terminated string */
1415            buffer[pos] = '\0';
1416    
1417          DPRINTF(XVID_DEBUG_RC, "middle frame size for asymmetric curve compression: %i\n",          return(buffer);
1418              (int)(rc->avg_length[XVID_TYPE_PVOP-1] * rc->curve_comp_scale));  }
1419    
1420      rc->overflow = 0;  /* This function returns a pointer to the first non space char in the given
1421      rc->KFoverflow = 0;   * string */
1422      rc->KFoverflow_partial = 0;  static char *
1423      rc->KF_idx = 1;  skipspaces(char *string)
1424    {
1425            const char spaces[] =
1426                    {
1427                            ' ','\t','\0'
1428                    };
1429            const char *spacechar = spaces;
1430    
1431            if (string == NULL) return(NULL);
1432    
1433            while (*string != '\0') {
1434                    /* Test against space chars */
1435                    while (*spacechar != '\0') {
1436                            if (*string == *spacechar) {
1437                                    string++;
1438                                    spacechar = spaces;
1439                                    break;
1440                            }
1441                            spacechar++;
1442                    }
1443    
1444                    /* No space char */
1445                    if (*spacechar == '\0') return(string);
1446  }  }
1447    
1448            return(string);
1449    }
1450    
1451    /* This function returns a boolean that tells if the string is only a
1452     * comment */
1453    static int
1454    iscomment(char *string)
1455    {
1456            const char comments[] =
1457                    {
1458                            '#',';', '%', '\0'
1459                    };
1460            const char *cmtchar = comments;
1461            int iscomment = 0;
1462    
1463            if (string == NULL) return(1);
1464    
1465            string = skipspaces(string);
1466    
1467            while(*cmtchar != '\0') {
1468                    if(*string == *cmtchar) {
1469                            iscomment = 1;
1470                            break;
1471                    }
1472                    cmtchar++;
1473            }
1474    
1475            return(iscomment);
1476    }
1477    
1478    #if 0
1479    static void
1480    stats_print(rc_2pass2_t * rc)
1481    {
1482            int i;
1483            const char frame_type[4] = { 'i', 'p', 'b', 's'};
1484    
1485            for (i=0; i<rc->num_frames; i++) {
1486                    twopass_stat_t *s = &rc->stats[i];
1487                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- frame:%d type:%c quant:%d stats:%d scaled:%d desired:%d actual:%d overflow(%c):%.2f\n",
1488                                    i, frame_type[s->type-1], -1, s->length, s->scaled_length,
1489                                    s->desired_length, -1, frame_type[s->type-1], -1.0f);
1490            }
1491    }
1492    #endif
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