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revision 1042, Sat May 24 21:22:18 2003 UTC revision 1316, Wed Jan 21 06:59:23 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 1.1.2.11 2003-05-24 21:22:18 edgomez Exp $   * $Id: plugin_2pass2.c,v 1.1.2.35 2004-01-21 06:59:23 syskin Exp $
29   *   *
30   *****************************************************************************/   *****************************************************************************/
31    
32    #define BQUANT_PRESCALE
33    #undef COMPENSATE_FORMULA
34    
35    /* forces second pass not to be bigger than first */
36    #undef PASS_SMALLER
37    
38  #include <stdio.h>  #include <stdio.h>
39  #include <math.h>  #include <math.h>
40  #include <limits.h>  #include <limits.h>
# Line 37  Line 43 
43  #include "../image/image.h"  #include "../image/image.h"
44    
45  /*****************************************************************************  /*****************************************************************************
46   * Some constants   * Some default settings
47   ****************************************************************************/   ****************************************************************************/
48    
 #define RAD2DEG 57.295779513082320876798154814105  
 #define DEG2RAD 0.017453292519943295769236907684886  
   
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
   
 /* Alt curve settings */  
 #define DEFAULT_USE_ALT_CURVE 0  
 #define DEFAULT_ALT_CURVE_HIGH_DIST 500  
 #define DEFAULT_ALT_CURVE_LOW_DIST 90  
 #define DEFAULT_ALT_CURVE_USE_AUTO 1  
 #define DEFAULT_ALT_CURVE_AUTO_STR 30  
 #define DEFAULT_ALT_CURVE_TYPE XVID_CURVE_LINEAR  
 #define DEFAULT_ALT_CURVE_MIN_REL_QUAL 50  
 #define DEFAULT_ALT_CURVE_USE_AUTO_BONUS_BIAS 1  
 #define DEFAULT_ALT_CURVE_BONUS_BIAS 50  
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 77  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             * constant statistical data
96             *--------------------------------*/
97    
98            /* Number of frames of the sequence */
99          int num_frames;          int num_frames;
100    
101            /* Number of Intra frames of the sequence */
102      int num_keyframes;      int num_keyframes;
     uint64_t target;    /* target filesize */  
103    
104      int count[3];   /* count of each frame types */          /* Target filesize to reach */
105      uint64_t tot_length[3];  /* total length of each frame types */          uint64_t target;
     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 */  
   
     /* zone statistical data */  
     double avg_weight;  /* average weight */  
     int64_t tot_quant;   /* total length used by XVID_ZONE_QUANT zones */  
   
   
     double curve_comp_scale;  
     double movie_curve;  
   
         double alt_curve_low;  
         double alt_curve_high;  
         double alt_curve_low_diff;  
         double alt_curve_high_diff;  
     double alt_curve_curve_bias_bonus;  
         double alt_curve_mid_qual;  
         double alt_curve_qual_dev;  
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      double pquant_error[32];          /* Index of the last keyframe used in the keyframe_location */
169      double bquant_error[32];          int KF_idx;
170      int quant_count[32];  
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];
183    
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 155  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 178  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 201  Line 284 
284    
285      rc->param = *param;      rc->param = *param;
286    
287            /* 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    
     /* Alt curve settings */  
         _INIT(rc->param.use_alt_curve, DEFAULT_USE_ALT_CURVE);  
     _INIT(rc->param.alt_curve_high_dist, DEFAULT_ALT_CURVE_HIGH_DIST);  
     _INIT(rc->param.alt_curve_low_dist, DEFAULT_ALT_CURVE_LOW_DIST);  
     _INIT(rc->param.alt_curve_use_auto, DEFAULT_ALT_CURVE_USE_AUTO);  
     _INIT(rc->param.alt_curve_auto_str, DEFAULT_ALT_CURVE_AUTO_STR);  
     _INIT(rc->param.alt_curve_type, DEFAULT_ALT_CURVE_TYPE);  
     _INIT(rc->param.alt_curve_min_rel_qual, DEFAULT_ALT_CURVE_MIN_REL_QUAL);  
     _INIT(rc->param.alt_curve_use_auto_bonus_bias, DEFAULT_ALT_CURVE_USE_AUTO_BONUS_BIAS);  
     _INIT(rc->param.alt_curve_bonus_bias, DEFAULT_ALT_CURVE_BONUS_BIAS);  
   
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          /* Count frames in the stats file */          /* Initialize some stuff to zero */
303      if (!det_stats_length(rc, param->filename)){          for(i=0; i<3; i++) {
304          DPRINTF(XVID_DEBUG_RC,"fopen %s failed\n", param->filename);                  int j;
305                    for (j=0; j<32; j++) {
306                            rc->quant_error[i][j] = 0;
307                            rc->quant_count[i][j] = 0;
308                    }
309            }
310    
311            for (i=0; i<3; i++) rc->last_quant[i] = 0;
312    
313            rc->fq_error = 0;
314    
315            /* Count frames (and intra frames) in the stats file, store the result into
316             * the rc structure */
317            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 */
331           * PS: see comment in pre_process0 for the +1 location requirement          rc->keyframe_locations = malloc((rc->num_keyframes + 1) * sizeof(int));
332           */          if (rc->keyframe_locations == NULL) {
     if ((rc->keyframe_locations = malloc((rc->num_keyframes + 1) * sizeof(int))) == 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,"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);
344          return XVID_ERR_FAIL;          return XVID_ERR_FAIL;
345      }      }
346    
347      /* pre-process our stats */          /* Compute the target filesize */
348            if (rc->param.bitrate<0) {
349          if (rc->num_frames  < create->fbase/create->fincr) {                  /* if negative, bitrate equals the target (in kbytes) */
350                  rc->target = rc->param.bitrate / 8;     /* one second */                  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 */
353                    rc->target = rc->param.bitrate / 8;
354          } else {          } else {
355                    /* Target filesize = bitrate/8 * numframes / framerate */
356                  rc->target =                  rc->target =
357                          ((uint64_t)rc->param.bitrate * (uint64_t)rc->num_frames * (uint64_t)create->fincr) / \                          ((uint64_t)rc->param.bitrate * (uint64_t)rc->num_frames * \
358                             (uint64_t)create->fincr) / \
359                          ((uint64_t)create->fbase * 8);                          ((uint64_t)create->fbase * 8);
360          }          }
361    
362      DPRINTF(XVID_DEBUG_RC, "Number of frames: %d\n", rc->num_frames);          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Frame rate: %d/%d (%ffps)\n",
363          DPRINTF(XVID_DEBUG_RC, "Frame rate: %d/%d\n", create->fbase, create->fincr);                          create->fbase, create->fincr,
364          DPRINTF(XVID_DEBUG_RC, "Target bitrate: %ld\n", rc->param.bitrate);                          (double)create->fbase/(double)create->fincr);
365          DPRINTF(XVID_DEBUG_RC, "Target filesize: %lld\n", rc->target);          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Number of frames: %d\n", rc->num_frames);
366            if(rc->param.bitrate>=0)
367                    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 mean 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);
         pre_process0(rc);  
375    
376            /* When bitrate is not given it means it has been scaled by an external
377             * application */
378          if (rc->param.bitrate) {          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);          zone_process(rc, create);
                 internal_scale(rc);  
388      }else{      }else{
389          /* external scaler: ignore zone */                  /* External scaling -- zones are ignored */
390          for (i=0;i<rc->num_frames;i++) {          for (i=0;i<rc->num_frames;i++) {
391              rc->stats[i].zone_mode = XVID_ZONE_WEIGHT;              rc->stats[i].zone_mode = XVID_ZONE_WEIGHT;
392              rc->stats[i].weight = 1.0;              rc->stats[i].weight = 1.0;
393          }          }
         rc->avg_weight = 1.0;  
394          rc->tot_quant = 0;          rc->tot_quant = 0;
395      }      }
         pre_process1(rc);  
396    
397      for (i=0; i<32;i++) {          /* Gathers some information about first pass stats:
398          rc->pquant_error[i] = 0;           *  - finds the minimum frame length for each frame type during 1st pass.
399          rc->bquant_error[i] = 0;           *     rc->min_size[]
400          rc->quant_count[i] = 0;           *  - determines the maximum frame length observed (no frame type distinction).
401             *     rc->max_size
402             *  - count how many times each frame type has been used.
403             *     rc->count[]
404             *  - total bytes used per frame type
405             *     rc->tot_length[]
406             *  - total bytes considered invariant between the 2 passes
407             *  - store keyframe location
408             *     rc->keyframe_locations[]
409             */
410            first_pass_stats_prepare_data(rc);
411    
412            /* If we have a user bitrate, it means it's an internal curve scaling */
413            if (rc->param.bitrate) {
414                    /* Perform internal curve scaling */
415                    first_pass_scale_curve_internal(rc);
416      }      }
417    
418      rc->fq_error = 0;          /* 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;
453      double curve_temp;          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          if (s->zone_mode == XVID_ZONE_QUANT) {           * 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) {
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 :-)  
          */  
491    
492          /* XXX: why by 8 */          /*************************************************************************/
493          overflow = rc->overflow / 8;          /*************************************************************************/
494            /*************************************************************************/
495    
496          /*          /*-------------------------------------------------------------------------
497           * The rc->overflow field represents the overflow in current scene (between two           * Frame bit allocation first part
498           * IFrames) so we must not forget to reset it if we are entering a new scene           *
499           */           * First steps apply user settings, just like it is done in the theoritical
500          if (s->type == XVID_TYPE_IVOP) {           * scaled_curve_apply_advanced_parameters
501                  overflow = 0;           *-----------------------------------------------------------------------*/
         }  
502    
503          desired = s->scaled_length;          /* Set desired to what we are wanting to obtain for this frame */
504            dbytes = (double)s->scaled_length;
505    
506          dbytes = desired;          /* IFrame user settings*/
507          if (s->type == XVID_TYPE_IVOP) {          if (s->type == XVID_TYPE_IVOP) {
508                  dbytes += desired * rc->param.keyframe_boost / 100;                  /* Keyframe boosting -- All keyframes benefit from it */
509          }                  dbytes += dbytes*rc->param.keyframe_boost / 100;
         dbytes /= rc->movie_curve;  
   
         /*  
          * We are now entering in the hard part of the algo, it was first designed  
          * to work with i/pframes only streams, so the way it computes things is  
          * adapted to pframes only. However we can use it if we just take care to  
          * scale the bframes sizes to pframes sizes using the ratio avg_p/avg_p and  
          * then before really using values depending on frame sizes, scaling the  
          * value again with the inverse ratio  
          */  
         if (s->type == XVID_TYPE_BVOP)  
                 dbytes *= rc->avg_length[XVID_TYPE_PVOP-1] / rc->avg_length[XVID_TYPE_BVOP-1];  
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          rc->curve_comp_error -= desired;                  /* Apply assymetric curve compression */
519                    if (rc->param.curve_compression_high || rc->param.curve_compression_low) {
520          /*                          double assymetric_delta;
521           * Alt curve treatment is not that hard to understand though the formulas  
522           * seem to be huge. Alt treatment is basically a way to soft/harden the                          /* Compute the assymetric delta, this is computed before applying
523           * curve flux applying sine/linear/cosine ratios                           * 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          /* XXX: warning */                          else
527          curve_temp = 0;                                  assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_low  / 100.0;
528    
529          if (rc->param.use_alt_curve) {                          /* Now we must apply the assymetric tax, else our curve compression
530                  if (s->type != XVID_TYPE_IVOP)  {                           * would not give a theoritical target size equal to what it is
531                          if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                           * expected */
532                                  if (dbytes >= rc->alt_curve_high) {                          dbytes *= rc->assymetric_tax_ratio;
533                                          curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev);  
534                                  } else {                          /* Now we can add the assymetric delta */
535                                          switch(rc->param.alt_curve_type) {                          dbytes += assymetric_delta;
                                         case XVID_CURVE_SINE :  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * sin(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_high_diff)));  
                                                 break;  
                                         case XVID_CURVE_LINEAR :  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) / rc->alt_curve_high_diff);  
                                                 break;  
                                         case XVID_CURVE_COSINE :  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_high_diff))));  
                                         }  
                                 }  
                         } else {  
                                 if (dbytes <= rc->alt_curve_low){  
                                         curve_temp = dbytes;  
                                 } else {  
                                         switch(rc->param.alt_curve_type) {  
                                         case XVID_CURVE_SINE :  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * sin(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_low_diff)));  
                                                 break;  
                                         case XVID_CURVE_LINEAR :  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) / rc->alt_curve_low_diff);  
                                                 break;  
                                         case XVID_CURVE_COSINE :  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual + rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_low_diff))));  
                                         }  
536                                  }                                  }
537                          }                          }
538    
539                          /*          /* That is what we would like to have -- Don't put that chunk after
540                           * End of code path for curve_temp, as told earlier, we are now           * overflow control, otherwise, overflow is counted twice and you obtain
541                           * obliged to scale the value to a bframe one using the inverse           * half sized bitrate sequences */
542                           * ratio applied earlier          s->desired_length  = (int)dbytes;
543                           */          rc->desired_total += dbytes;
                         if (s->type == XVID_TYPE_BVOP)  
                                 curve_temp *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
544    
545                          curve_temp = curve_temp * rc->curve_comp_scale + rc->alt_curve_curve_bias_bonus;          /*------------------------------------------------------------------------
546             * 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                          desired += ((int)curve_temp);                  /* Take only the desired part of overflow */
559                          rc->curve_comp_error += curve_temp - (int)curve_temp;                  overflow = rc->overflow;
                 } else {  
                         /*  
                          * End of code path for dbytes, as told earlier, we are now  
                          * obliged to scale the value to a bframe one using the inverse  
                          * ratio applied earlier  
                          */  
                         if (s->type == XVID_TYPE_BVOP)  
                                 dbytes *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
560    
561                          desired += ((int)dbytes);                  /* Factor that will take care to decrease the overflow applied
562                          rc->curve_comp_error += dbytes - (int)dbytes;                   * according to the importance of this frame type in term of
563                  }                   * overall size */
564                    frametype_factor  = rc->count[XVID_TYPE_IVOP-1]*rc->avg_length[XVID_TYPE_IVOP-1];
565                    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          } else if ((rc->param.curve_compression_high + rc->param.curve_compression_low) &&      s->type != XVID_TYPE_IVOP) {                  /* Treat only the overflow part concerned by this frame type and size */
576                    overflow *= frametype_factor;
577    #if 0
578                    /* Leave this one alone, as it impacts badly on quality */
579                    overflow *= framesize_factor;
580    #endif
581    
582                  curve_temp = rc->curve_comp_scale;                  /* Apply the overflow strength imposed by the user */
583                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                  overflow *= (rc->param.overflow_control_strength/100.0f);
                         curve_temp *= ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_high / 100.0);  
584                  } else {                  } else {
585                          curve_temp *= ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_low / 100.0);                  /* no negative overflow applied in IFrames because:
586                     *  - their role is important as they're references for P/BFrames.
587                     *  - there aren't much in typical sequences, so if an IFrame overflows too
588                     *    much, this overflow may impact the next IFrame too much and generate
589                     *    a sequence of poor quality frames */
590                    overflow = 0;
591                  }                  }
592    
593                  /*          /* Make sure we are not trying to compensate more overflow than we even have */
594                   * End of code path for curve_temp, as told earlier, we are now          if (fabs(overflow) > fabs(rc->overflow))
595                   * obliged to scale the value to a bframe one using the inverse                  overflow = rc->overflow;
                  * ratio applied earlier  
                  */  
                 if (s->type == XVID_TYPE_BVOP)  
                         curve_temp *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
596    
597                  desired += (int)curve_temp;          /* Make sure the overflow doesn't make the frame size to get out of the range
598                  rc->curve_comp_error += curve_temp - (int)curve_temp;           * [-max_degradation..+max_improvment] */
599            if (overflow > dbytes*rc->param.max_overflow_improvement / 100) {
600                    if(overflow <= dbytes)
601                            dbytes += dbytes * rc->param.max_overflow_improvement / 100;
602                    else
603                            dbytes += overflow * rc->param.max_overflow_improvement / 100;
604            } else if (overflow < - dbytes * rc->param.max_overflow_degradation / 100) {
605                    dbytes -= dbytes * rc->param.max_overflow_degradation / 100;
606          } else {          } else {
607                  /*                  dbytes += overflow;
                  * End of code path for dbytes, as told earlier, we are now  
                  * obliged to scale the value to a bframe one using the inverse  
                  * ratio applied earlier  
                  */  
                 if (s->type == XVID_TYPE_BVOP)  
                         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;  
608          }          }
609    
610            /*-------------------------------------------------------------------------
611          /*           * Frame bit allocation last part:
612           * We can't do bigger frames than first pass, this would be stupid as first           *
613           * pass is quant=2 and that reaching quant=1 is not worth it. We would lose           * Cap frame length so we don't reach neither bigger frame sizes than first
614           * many bytes and we would not not gain much quality.           * pass nor smaller than the allowed minimum.
615           */           *-----------------------------------------------------------------------*/
616          if (desired > s->length) {  
617                  rc->curve_comp_error += desired - s->length;  #ifdef PASS_SMALLER
618                  desired = s->length;          if (dbytes > s->length) {
619          } else {                  dbytes = s->length;
620                  if (desired < rc->min_length[s->type-1]) {          } else
621                          if (s->type == XVID_TYPE_IVOP){                  if (dbytes < rc->min_length[s->type-1]) {
622                                  rc->curve_comp_error -= rc->min_length[XVID_TYPE_IVOP-1] - desired;                  dbytes = rc->min_length[s->type-1];
623                          }          } else if (dbytes > rc->max_length) {
624                          desired = rc->min_length[s->type-1];                  /* ToDo: this condition is always wrong as max_length == maximum frame
625                  }                   * length of first pass, so the first condition already caps the frame
626                     * size... */
627                    capped_to_max_framesize = 1;
628                    dbytes = rc->max_length;
629                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- frame:%d Capped to maximum frame size\n",
630                                    data->frame_num);
631          }          }
632    #endif
633            /*------------------------------------------------------------------------
634             * Desired frame length <-> quantizer mapping
635             *-----------------------------------------------------------------------*/
636    
637          s->desired_length = desired;  #ifdef BQUANT_PRESCALE
638            /* For bframes we prescale the quantizer to avoid too high quant scaling */
639            if(s->type == XVID_TYPE_BVOP) {
         /* if this keyframe is too close to the next, reduce it's byte allotment  
            XXX: why do we do this after setting the desired length  */  
   
         if (s->type == XVID_TYPE_IVOP) {  
                 int KFdistance = rc->keyframe_locations[rc->KF_idx] - rc->keyframe_locations[rc->KF_idx - 1];  
   
                 if (KFdistance < rc->param.kftreshold) {  
   
                         KFdistance -= rc->param.min_key_interval;  
   
                         if (KFdistance >= 0) {  
                                 int KF_min_size;  
   
                                 KF_min_size = desired * (100 - rc->param.kfreduction) / 100;  
                                 if (KF_min_size < 1)  
                                         KF_min_size = 1;  
   
                                 desired = KF_min_size + (desired - KF_min_size) * KFdistance /  
                                         (rc->param.kftreshold - rc->param.min_key_interval);  
   
                                 if (desired < 1)  
                                         desired = 1;  
                         }  
                 }  
         }  
640    
641          overflow = (int)((double)overflow * desired / rc->avg_length[XVID_TYPE_PVOP-1]);                  twopass_stat_t *b_ref = s;
642    
643          /* Reign in overflow with huge frames */                  /* Find the reference frame */
644          if (labs(overflow) > labs(rc->overflow)) {                  while(b_ref != &rc->stats[0] && b_ref->type == XVID_TYPE_BVOP)
645                  overflow = rc->overflow;                          b_ref--;
646    
647                    /* Compute the original quant */
648                    s->quant  = 2*(100*s->quant - data->bquant_offset);
649                    s->quant += data->bquant_ratio - 1; /* to avoid rounding issues */
650                    s->quant  = s->quant/data->bquant_ratio - b_ref->quant;
651          }          }
652    #endif
653    
654          /* Make sure overflow doesn't run away */          /* Don't laugh at this very 'simple' quant<->size relationship, it
655          if (overflow > desired * rc->param.max_overflow_improvement / 100) {           * proves to be acurate enough for our algorithm */
656                  desired += (overflow <= desired) ? desired * rc->param.max_overflow_improvement / 100 :          scaled_quant = (double)s->quant*(double)s->length/(double)dbytes;
657                          overflow * rc->param.max_overflow_improvement / 100;  
658          } else if (overflow < desired * rc->param.max_overflow_degradation / -100){  #ifdef COMPENSATE_FORMULA
659                  desired += desired * rc->param.max_overflow_degradation / -100;          /* We know xvidcore will apply the bframe formula again, so we compensate
660          } else {           * it right now to make sure we would not apply it twice */
661                  desired += overflow;          if(s->type == XVID_TYPE_BVOP) {
         }  
662    
663          /* 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);  
         }  
664    
665          /* Make sure to not scale below the minimum framesize */                  /* Find the reference frame */
666          if (desired < rc->min_length[s->type-1]) {                  while(b_ref != &rc->stats[0] && b_ref->type == XVID_TYPE_BVOP)
667                  desired = rc->min_length[s->type-1];                          b_ref--;
668                  DPRINTF(XVID_DEBUG_RC,"[%i] Capped to minimum frame size\n",  
669                                  data->frame_num);                  /* Compute the quant it would be if the core did not apply the bframe
670                     * formula */
671                    scaled_quant  = 100*scaled_quant - data->bquant_offset;
672                    scaled_quant += data->bquant_ratio - 1; /* to avoid rouding issues */
673                    scaled_quant /= data->bquant_ratio;
674          }          }
675    #endif
676    
677          /*          /* Quantizer has been scaled using floating point operations/results, we
678           * Don't laugh at this very 'simple' quant<->filesize relationship, it           * must cast it to integer */
679           * proves to be acurate enough for our algorithm          data->quant = (int)scaled_quant;
          */  
         data->quant = s->quant*s->length/desired;  
680    
681          /* Let's clip the computed quantizer, if needed */          /* Let's clip the computed quantizer, if needed */
682          if (data->quant < 1) {          if (data->quant < 1) {
683                  data->quant = 1;                  data->quant = 1;
684          } else if (data->quant > 31) {          } else if (data->quant > 31) {
685                  data->quant = 31;                  data->quant = 31;
         } else if (s->type != XVID_TYPE_IVOP) {  
   
                 /*  
                  * The frame quantizer has not been clipped, this appear to be a good  
                  * computed quantizer, however past frames give us some info about how  
                  * this quantizer performs against the algo prevision. Let's use this  
                  * prevision to increase the quantizer when we observe a too big  
                  * accumulated error  
                  */  
                 if (s->type == XVID_TYPE_BVOP) {  
                         rc->bquant_error[data->quant] += ((double)(s->quant * s->length) / desired) - data->quant;  
   
                         if (rc->bquant_error[data->quant] >= 1.0) {  
                                 rc->bquant_error[data->quant] -= 1.0;  
                                 data->quant++;  
                         }  
686                  } else {                  } else {
                         rc->pquant_error[data->quant] += ((double)(s->quant * s->length) / desired) - data->quant;  
687    
688                          if (rc->pquant_error[data->quant] >= 1.0) {                  /* The frame quantizer has not been clipped, this appears to be a good
689                                  rc->pquant_error[data->quant] -= 1.0;                   * computed quantizer, do not loose quantizer decimal part that we
690                     * accumulate for later reuse when its sum represents a complete
691                     * unit. */
692                    rc->quant_error[s->type-1][data->quant] += scaled_quant - (double)data->quant;
693    
694                    if (rc->quant_error[s->type-1][data->quant] >= 1.0) {
695                            rc->quant_error[s->type-1][data->quant] -= 1.0;
696                                  data->quant++;                                  data->quant++;
697                          }                  } else if (rc->quant_error[s->type-1][data->quant] <= -1.0) {
698                            rc->quant_error[s->type-1][data->quant] += 1.0;
699                            data->quant--;
700                  }                  }
701          }          }
702    
703          /*          /* 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  
704           * possible +1 correction due to cumulated error. We can now safely clip           * possible +1 correction due to cumulated error. We can now safely clip
705           * the quantizer again with user's quant ranges. "Safely" means the Rate           * the quantizer again with user's quant ranges. "Safely" means the Rate
706           * Control could learn more about this quantizer, this knowledge is useful           * Control could learn more about this quantizer, this knowledge is useful
707           * 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,
708           * that's why we don't perform this clipping earlier.           * that's why we don't perform this clipping earlier. */
          */  
709          if (data->quant < data->min_quant[s->type-1]) {          if (data->quant < data->min_quant[s->type-1]) {
710                  data->quant = data->min_quant[s->type-1];                  data->quant = data->min_quant[s->type-1];
711          } else if (data->quant > data->max_quant[s->type-1]) {          } else if (data->quant > data->max_quant[s->type-1]) {
712                  data->quant = data->max_quant[s->type-1];                  data->quant = data->max_quant[s->type-1];
713          }          }
714    
715          /*          /* 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"  
716           * rule that makes |last_quant - new_quant| <= 2. This rule only applies           * rule that makes |last_quant - new_quant| <= 2. This rule only applies
717           * to predicted frames (P and B)           * to predicted frames (P and B) */
          */  
718          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) {
719    
720                  if (data->quant > rc->last_quant[s->type-1] + 2) {                  if (data->quant > rc->last_quant[s->type-1] + 2) {
721                          data->quant = rc->last_quant[s->type-1] + 2;                          data->quant = rc->last_quant[s->type-1] + 2;
722                          DPRINTF(XVID_DEBUG_RC,                          DPRINTF(XVID_DEBUG_RC,
723                                          "[%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",
724                                          data->frame_num);                                          data->frame_num);
725                  }                  }
726                  if (data->quant < rc->last_quant[s->type-1] - 2) {                  if (data->quant < rc->last_quant[s->type-1] - 2) {
727                          data->quant = rc->last_quant[s->type-1] - 2;                          data->quant = rc->last_quant[s->type-1] - 2;
728                          DPRINTF(XVID_DEBUG_RC,                          DPRINTF(XVID_DEBUG_RC,
729                                          "[%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",
730                                          data->frame_num);                                          data->frame_num);
731                  }                  }
732          }          }
733    
734          /*          /* We don't want to pollute the RC histerisis when our computed quant has
735           * We don't want to pollute the RC history results when our computed quant           * been computed from a capped frame size */
736           * has been computed from a capped frame size          if (capped_to_max_framesize == 0)
          */  
         if (capped_to_max_framesize == 0) {  
737                  rc->last_quant[s->type-1] = data->quant;                  rc->last_quant[s->type-1] = data->quant;
738          }  
739            /* Don't forget to force 1st pass frame type ;-) */
740            data->type = s->type;
741    
742          return 0;          return 0;
743  }  }
# Line 678  Line 748 
748  static int  static int
749  rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)  rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)
750  {  {
751      stat_t * s = &rc->stats[data->frame_num];          const char frame_type[4] = { 'i', 'p', 'b', 's'};
752            twopass_stat_t * s = &rc->stats[data->frame_num];
753    
754          /* Insufficent stats data */          /* Insufficent stats data */
755      if (data->frame_num >= rc->num_frames)      if (data->frame_num >= rc->num_frames)
756          return 0;          return 0;
757    
758      rc->quant_count[data->quant]++;          /* Update the quantizer counter */
759            rc->quant_count[s->type-1][data->quant]++;
760    
761            /* Update the frame type overflow */
762      if (data->type == XVID_TYPE_IVOP) {      if (data->type == XVID_TYPE_IVOP) {
763          int kfdiff = (rc->keyframe_locations[rc->KF_idx] -      rc->keyframe_locations[rc->KF_idx - 1]);                  int kfdiff = 0;
764    
765                    if(rc->KF_idx != rc->num_frames -1) {
766                            kfdiff  = rc->keyframe_locations[rc->KF_idx+1];
767                            kfdiff -= rc->keyframe_locations[rc->KF_idx];
768                    }
769    
770                    /* Flush Keyframe overflow accumulator */
771          rc->overflow += rc->KFoverflow;          rc->overflow += rc->KFoverflow;
772    
773                    /* Store the frame overflow to the keyframe accumulator */
774          rc->KFoverflow = s->desired_length - data->length;          rc->KFoverflow = s->desired_length - data->length;
775    
776          if (kfdiff > 1) {  // non-consecutive keyframes                  if (kfdiff > 1) {
777                            /* Non-consecutive keyframes case:
778                             * We can then divide this total keyframe overflow into equal parts
779                             * that we will distribute into regular overflow at each frame
780                             * between the sequence bounded by two IFrames */
781              rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);              rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);
782          }else{ // consecutive keyframes                  } else {
783                            /* Consecutive keyframes case:
784                             * Flush immediatly the keyframe overflow and reset keyframe
785                             * overflow */
786                          rc->overflow += rc->KFoverflow;                          rc->overflow += rc->KFoverflow;
787                          rc->KFoverflow = 0;                          rc->KFoverflow = 0;
788                          rc->KFoverflow_partial = 0;                          rc->KFoverflow_partial = 0;
789          }          }
790          rc->KF_idx++;          rc->KF_idx++;
791      } else {      } else {
792          // distribute part of the keyframe overflow                  /* Accumulate the frame overflow */
793          rc->overflow += s->desired_length - data->length + rc->KFoverflow_partial;                  rc->overflow += s->desired_length - data->length;
794    
795                    /* Distribute part of the keyframe overflow */
796                    rc->overflow += rc->KFoverflow_partial;
797    
798                    /* Don't forget to substract that same amount from the total keyframe
799                     * overflow */
800          rc->KFoverflow -= rc->KFoverflow_partial;          rc->KFoverflow -= rc->KFoverflow_partial;
801      }      }
802    
803          DPRINTF(XVID_DEBUG_RC, "[%i] quant:%i stats1:%i scaled:%i actual:%i overflow:%i\n",          rc->overflow += (s->error = s->desired_length - data->length);
804            rc->real_total += data->length;
805    
806            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",
807                          data->frame_num,                          data->frame_num,
808                            frame_type[data->type-1],
809                          data->quant,                          data->quant,
810                          s->length,                          s->length,
811                          s->scaled_length,                          s->scaled_length,
812                          data->length,                          s->desired_length,
813                            s->desired_length - s->error,
814                            -s->error,
815                          rc->overflow);                          rc->overflow);
816    
817      return(0);      return(0);
# Line 721  Line 821 
821   * Helper functions definition   * Helper functions definition
822   ****************************************************************************/   ****************************************************************************/
823    
824    /* Default buffer size for reading lines */
825  #define BUF_SZ   1024  #define BUF_SZ   1024
 #define MAX_COLS 5  
826    
827  /* open stats file, and count num frames */  /* Helper functions for reading/parsing the stats file */
828    static char *skipspaces(char *string);
829    static int iscomment(char *string);
830    static char *readline(FILE *f);
831    
832    /* This function counts the number of frame entries in the stats file
833     * It also counts the number of I Frames */
834  static int  static int
835  det_stats_length(rc_2pass2_t * rc, char * filename)  statsfile_count_frames(rc_2pass2_t * rc, char * filename)
836  {  {
837      FILE * f;      FILE * f;
838      int n, ignore;          char *line;
839      char type;          int lines;
840    
841      rc->num_frames = 0;      rc->num_frames = 0;
842      rc->num_keyframes = 0;      rc->num_keyframes = 0;
843    
844      if ((f = fopen(filename, "rt")) == NULL)          if ((f = fopen(filename, "rb")) == NULL)
845          return 0;                  return(-1);
846    
847      while((n = fscanf(f, "%c %d %d %d %d %d %d\n",          lines = 0;
848          &type, &ignore, &ignore, &ignore, &ignore, &ignore, &ignore)) != EOF) {          while ((line = readline(f)) != NULL) {
849          if (type == 'i') {  
850              rc->num_frames++;                  char *ptr;
851                    char type;
852                    int fields;
853    
854                    lines++;
855    
856                    /* We skip spaces */
857                    ptr = skipspaces(line);
858    
859                    /* Skip coment lines or empty lines */
860                    if(iscomment(ptr) || *ptr == '\0') {
861                            free(line);
862                            continue;
863                    }
864    
865                    /* Read the stat line from buffer */
866                    fields = sscanf(ptr, "%c", &type);
867    
868                    /* Valid stats files have at least 7 fields */
869                    if (fields == 1) {
870                            switch(type) {
871                            case 'i':
872                            case 'I':
873              rc->num_keyframes++;              rc->num_keyframes++;
874          }else if (type == 'p' || type == 'b' || type == 's') {                          case 'p':
875                            case 'P':
876                            case 'b':
877                            case 'B':
878                            case 's':
879                            case 'S':
880              rc->num_frames++;              rc->num_frames++;
881                                    break;
882                            default:
883                                    DPRINTF(XVID_DEBUG_RC,
884                                                    "[xvid rc] -- WARNING: L%d unknown frame type used (%c).\n",
885                                                    lines, type);
886          }          }
887                    } else {
888                                    DPRINTF(XVID_DEBUG_RC,
889                                                    "[xvid rc] -- WARNING: L%d misses some stat fields (%d).\n",
890                                                    lines, 7-fields);
891      }      }
892    
893                    /* Free the line buffer */
894                    free(line);
895            }
896    
897            /* We are done with the file */
898      fclose(f);      fclose(f);
899    
900      return 1;          return(0);
901  }  }
902    
903  /* open stats file(s) and read into rc->stats array */  /* open stats file(s) and read into rc->stats array */
   
904  static int  static int
905  load_stats(rc_2pass2_t *rc, char * filename)  statsfile_load(rc_2pass2_t *rc, char * filename)
906  {  {
907      FILE * f;      FILE * f;
908      int i, not_scaled;          int processed_entries;
909    
910            /* Opens the file */
911            if ((f = fopen(filename, "rb"))==NULL)
912                    return(-1);
913    
914      if ((f = fopen(filename, "rt"))==NULL)          processed_entries = 0;
915          return 0;          while(processed_entries < rc->num_frames) {
   
     i = 0;  
         not_scaled = 0;  
     while(i < rc->num_frames) {  
         stat_t * s = &rc->stats[i];  
         int n;  
916          char type;          char type;
917                    int fields;
918                    twopass_stat_t * s = &rc->stats[processed_entries];
919                    char *line, *ptr;
920    
921                  s->scaled_length = 0;                  /* Read the line from the file */
922          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((line = readline(f)) == NULL)
923          if (n == EOF) break;                          break;
924                  if (n < 7) {  
925                          not_scaled = 1;                  /* We skip spaces */
926                    ptr = skipspaces(line);
927    
928                    /* Skip comment lines or empty lines */
929                    if(iscomment(ptr) || *ptr == '\0') {
930                            free(line);
931                            continue;
932                  }                  }
933    
934          if (type == 'i') {                  /* Reset this field that is optional */
935                    s->scaled_length = 0;
936    
937                    /* Convert the fields */
938                    fields = sscanf(ptr,
939                                                    "%c %d %d %d %d %d %d %d\n",
940                                                    &type,
941                                                    &s->quant,
942                                                    &s->blks[0], &s->blks[1], &s->blks[2],
943                                                    &s->length, &s->invariant /* not really yet */,
944                                                    &s->scaled_length);
945    
946                    /* Free line buffer, we don't need it anymore */
947                    free(line);
948    
949                    /* Fail silently, this has probably been warned in
950                     * statsfile_count_frames */
951                    if(fields != 7 && fields != 8)
952                            continue;
953    
954                    /* Convert frame type and compute the invariant length part */
955                    switch(type) {
956                    case 'i':
957                    case 'I':
958              s->type = XVID_TYPE_IVOP;              s->type = XVID_TYPE_IVOP;
959          }else if (type == 'p' || type == 's') {                          s->invariant /= INVARIANT_HEADER_PART_IVOP;
960                            break;
961                    case 'p':
962                    case 'P':
963                    case 's':
964                    case 'S':
965              s->type = XVID_TYPE_PVOP;              s->type = XVID_TYPE_PVOP;
966          }else if (type == 'b') {                          s->invariant /= INVARIANT_HEADER_PART_PVOP;
967                            break;
968                    case 'b':
969                    case 'B':
970              s->type = XVID_TYPE_BVOP;              s->type = XVID_TYPE_BVOP;
971          }else{  /* unknown type */                          s->invariant /= INVARIANT_HEADER_PART_BVOP;
972              DPRINTF(XVID_DEBUG_RC, "unknown stats frame type; assuming pvop\n");                          break;
973              s->type = XVID_TYPE_PVOP;                  default:
974                            /* Same as before, fail silently */
975                            continue;
976          }          }
977    
978          i++;                  /* Ok it seems it's been processed correctly */
979                    processed_entries++;
980      }      }
981    
982      rc->num_frames = i;          /* Close the file */
   
983          fclose(f);          fclose(f);
984    
985      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);  
     }  
986  }  }
 #endif  
987    
988  /* pre-process the statistics data  /* pre-process the statistics data
989      - for each type, count, tot_length, min_length, max_length   * - for each type, count, tot_length, min_length, max_length
990      - set keyframes_locations   * - set keyframes_locations, tot_prescaled */
 */  
   
991  static void  static void
992  pre_process0(rc_2pass2_t * rc)  first_pass_stats_prepare_data(rc_2pass2_t * rc)
993  {  {
994      int i,j;      int i,j;
995    
996            /* *rc fields initialization
997             * NB: INT_MAX and INT_MIN are used in order to be immediately replaced
998             *     with real values of the 1pass */
999      for (i=0; i<3; i++) {      for (i=0; i<3; i++) {
1000          rc->count[i]=0;          rc->count[i]=0;
1001          rc->tot_length[i] = 0;          rc->tot_length[i] = 0;
1002          rc->last_quant[i] = 0;                  rc->tot_invariant[i] = 0;
1003                  rc->min_length[i] = INT_MAX;                  rc->min_length[i] = INT_MAX;
1004      }      }
1005    
1006          rc->max_length = INT_MIN;          rc->max_length = INT_MIN;
1007            rc->tot_weighted = 0;
1008    
1009            /* Loop through all frames and find/compute all the stuff this function
1010             * is supposed to do */
1011      for (i=j=0; i<rc->num_frames; i++) {      for (i=j=0; i<rc->num_frames; i++) {
1012          stat_t * s = &rc->stats[i];                  twopass_stat_t * s = &rc->stats[i];
1013    
1014          rc->count[s->type-1]++;          rc->count[s->type-1]++;
1015          rc->tot_length[s->type-1] += s->length;          rc->tot_length[s->type-1] += s->length;
1016                    rc->tot_invariant[s->type-1] += s->invariant;
1017                    if (s->zone_mode != XVID_ZONE_QUANT)
1018                            rc->tot_weighted += (int)(s->weight*(s->length - s->invariant));
1019    
1020          if (s->length < rc->min_length[s->type-1]) {          if (s->length < rc->min_length[s->type-1]) {
1021              rc->min_length[s->type-1] = s->length;              rc->min_length[s->type-1] = s->length;
# Line 851  Line 1031 
1031          }          }
1032      }      }
1033    
1034          /*          /* NB:
          * Nota Bene:  
1035           * The "per sequence" overflow system considers a natural sequence to be           * The "per sequence" overflow system considers a natural sequence to be
1036           * 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
1037           * 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
1038           * frame to appear in the keyframe locations array.           * frame to appear in the keyframe locations array. */
          */  
1039      rc->keyframe_locations[j] = i;      rc->keyframe_locations[j] = i;
1040    
1041          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]);
1042          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]);
1043          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]);
1044  }  }
1045    
1046  /* calculate zone weight "center" */  /* calculate zone weight "center" */
   
1047  static void  static void
1048  zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)  zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)
1049  {  {
1050      int i,j;      int i,j;
1051      int n = 0;      int n = 0;
1052    
     rc->avg_weight = 0.0;  
1053      rc->tot_quant = 0;      rc->tot_quant = 0;
1054            rc->tot_quant_invariant = 0;
1055    
1056      if (create->num_zones == 0) {      if (create->num_zones == 0) {
1057          for (j = 0; j < rc->num_frames; j++) {          for (j = 0; j < rc->num_frames; j++) {
1058              rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;              rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1059              rc->stats[j].weight = 1.0;              rc->stats[j].weight = 1.0;
1060          }          }
         rc->avg_weight += rc->num_frames * 1.0;  
1061          n += rc->num_frames;          n += rc->num_frames;
1062      }      }
1063    
# Line 891  Line 1066 
1066    
1067          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;
1068    
1069                    /* Zero weight make no sense */
1070                    if (create->zones[i].increment == 0) create->zones[i].increment = 1;
1071                    /* And obviously an undetermined infinite makes even less sense */
1072                    if (create->zones[i].base == 0) create->zones[i].base = 1;
1073    
1074          if (i==0 && create->zones[i].frame > 0) {          if (i==0 && create->zones[i].frame > 0) {
1075              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++) {
1076                  rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;                  rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1077                  rc->stats[j].weight = 1.0;                  rc->stats[j].weight = 1.0;
1078              }              }
             rc->avg_weight += create->zones[i].frame * 1.0;  
1079              n += create->zones[i].frame;              n += create->zones[i].frame;
1080          }          }
1081    
# Line 906  Line 1085 
1085                  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;
1086              }              }
1087              next -= create->zones[i].frame;              next -= create->zones[i].frame;
             rc->avg_weight += (double)(next * create->zones[i].increment) / (double)create->zones[i].base;  
1088              n += next;              n += next;
1089          }else{  // XVID_ZONE_QUANT                  } else{  /* XVID_ZONE_QUANT */
1090              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++ ) {
1091                  rc->stats[j].zone_mode = XVID_ZONE_QUANT;                  rc->stats[j].zone_mode = XVID_ZONE_QUANT;
1092                  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;
1093                  rc->tot_quant += rc->stats[j].length;                  rc->tot_quant += rc->stats[j].length;
1094                                    rc->tot_quant_invariant += rc->stats[j].invariant;
1095              }              }
1096          }          }
1097      }      }
     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);  
1098  }  }
1099    
1100    
1101  /* scale the curve */  /* scale the curve */
   
1102  static void  static void
1103  internal_scale(rc_2pass2_t *rc)  first_pass_scale_curve_internal(rc_2pass2_t *rc)
1104  {  {
1105          int64_t target  = rc->target - rc->tot_quant;          int64_t target;
1106          int64_t pass1_length = rc->tot_length[0] + rc->tot_length[1] + rc->tot_length[2] - rc->tot_quant;          int64_t total_invariant;
1107          double scaler;          double scaler;
1108          int i;          int i, num_MBs;
1109    
1110            /* We only scale texture data ! */
1111            total_invariant  = rc->tot_invariant[XVID_TYPE_IVOP-1];
1112            total_invariant += rc->tot_invariant[XVID_TYPE_PVOP-1];
1113            total_invariant += rc->tot_invariant[XVID_TYPE_BVOP-1];
1114            /* don't forget to substract header bytes used in quant zones, otherwise we
1115             * counting them twice */
1116            total_invariant -= rc->tot_quant_invariant;
1117    
1118            /* We remove the bytes used by the fixed quantizer zones during first pass
1119             * with the same quants, so we know very precisely how much that
1120             * represents */
1121            target  = rc->target;
1122            target -= rc->tot_quant;
1123    
1124          /* Let's compute a linear scaler in order to perform curve scaling */          /* Let's compute a linear scaler in order to perform curve scaling */
1125          scaler = (double)target / (double)pass1_length;          scaler = (double)(target - total_invariant) / (double)(rc->tot_weighted);
1126    
1127          if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {          /* Compute min frame lengths (for each frame type) according to the number
1128                  DPRINTF(XVID_DEBUG_RC, "WARNING: Undersize detected\n");           * of MBs. We sum all block type counters of frame 0, this gives us the
1129          scaler = 1.0;           * number of MBs.
1130          }           *
1131             * We compare these hardcoded values with observed values in first pass
1132             * (determined in pre_process0).Then we keep the real minimum. */
1133    
1134      DPRINTF(XVID_DEBUG_RC,          /* Number of MBs */
1135                          "Before correction: target=%i, tot_length=%i, scaler=%f\n",          num_MBs  = rc->stats[0].blks[0];
1136                          (int)target, (int)pass1_length, scaler);          num_MBs += rc->stats[0].blks[1];
1137            num_MBs += rc->stats[0].blks[2];
1138    
1139            /* Minimum for I frames */
1140            if(rc->min_length[XVID_TYPE_IVOP-1] > ((num_MBs*22) + 240) / 8)
1141                    rc->min_length[XVID_TYPE_IVOP-1] = ((num_MBs*22) + 240) / 8;
1142    
1143            /* Minimum for P/S frames */
1144            if(rc->min_length[XVID_TYPE_PVOP-1] > ((num_MBs) + 88)  / 8)
1145                    rc->min_length[XVID_TYPE_PVOP-1] = ((num_MBs) + 88)  / 8;
1146    
1147            /* Minimum for B frames */
1148            if(rc->min_length[XVID_TYPE_BVOP-1] > 8)
1149                    rc->min_length[XVID_TYPE_BVOP-1] = 8;
1150    
1151          /*          /* Perform an initial scale pass.
1152           * Perform an initial scale pass.           *
1153           * If a frame size is scaled underneath our hardcoded minimums, then we           * If a frame size is scaled underneath our hardcoded minimums, then we
1154           * force the frame size to the minimum, and deduct the original & scaled           * force the frame size to the minimum, and deduct the original & scaled
1155           * frame length from the original and target total lengths           * frame length from the original and target total lengths */
          */  
   
1156          for (i=0; i<rc->num_frames; i++) {          for (i=0; i<rc->num_frames; i++) {
1157                  stat_t * s = &rc->stats[i];                  twopass_stat_t * s = &rc->stats[i];
                 int min_size[3];  
1158                  int len;                  int len;
1159    
1160                  /* Compute min frame lengths (oe for each frame type) */                  /* No need to scale frame length for which a specific quantizer is
1161                  min_size[0] = ((s->blks[0]*22) + 240) / 8;                   * specified thanks to zones */
                 min_size[1] = (s->blks[0] + 88) / 8;  
                 min_size[2] = 8;  
   
1162          if (s->zone_mode == XVID_ZONE_QUANT) {          if (s->zone_mode == XVID_ZONE_QUANT) {
1163              s->scaled_length = s->length;              s->scaled_length = s->length;
1164                          continue;                          continue;
1165                  }                  }
1166    
1167                  /* Compute teh scaled length */                  /* Compute the scaled length -- only non invariant data length is scaled */
1168                  len = (int)((double)s->length * scaler * s->weight / rc->avg_weight);                  len = s->invariant + (int)((double)(s->length-s->invariant) * scaler * s->weight);
1169    
1170                  /* Compare with the computed minimum */                  /* Compare with the computed minimum */
1171                  if (len < min_size[s->type-1]) {                  if (len < rc->min_length[s->type-1]) {
1172                          /* force frame size to our computed minimum */                          /* This is a 'forced size' frame, set its frame size to the
1173                          s->scaled_length = min_size[s->type-1];                           * computed minimum */
1174                            s->scaled_length = rc->min_length[s->type-1];
1175    
1176                            /* Remove both scaled and original size from their respective
1177                             * total counters, as we prepare a second pass for 'regular'
1178                             * frames */
1179                          target -= s->scaled_length;                          target -= s->scaled_length;
                         pass1_length -= s->length;  
1180                  } else {                  } else {
1181                          /* Do nothing for now, we'll scale this later */                          /* Do nothing for now, we'll scale this later */
1182                          s->scaled_length = 0;                          s->scaled_length = 0;
1183                  }                  }
   
1184          }          }
1185    
1186          /* Correct the scaler for all non forced frames */          /* The first pass on data substracted all 'forced size' frames from the
1187          scaler = (double)target / (double)pass1_length;           * total counters. Now, it's possible to scale the 'regular' frames. */
1188    
1189          /* Detect undersizing */          /* Scaling factor for 'regular' frames */
1190      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);  
1191    
1192          /* Do another pass with the new scaler */          /* Do another pass with the new scaler */
1193          for (i=0; i<rc->num_frames; i++) {          for (i=0; i<rc->num_frames; i++) {
1194                  stat_t * s = &rc->stats[i];                  twopass_stat_t * s = &rc->stats[i];
1195    
1196                  /* Ignore frame with forced frame sizes */                  /* Ignore frame with forced frame sizes */
1197                  if (s->scaled_length == 0)                  if (s->scaled_length == 0)
1198                          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);
1199          }          }
1200    
1201            /* Job done */
1202            return;
1203  }  }
1204    
1205    /* Apply all user settings to the scaled curve
1206     * This implies:
1207     *   keyframe boosting
1208     *   high/low compression */
1209  static void  static void
1210  pre_process1(rc_2pass2_t * rc)  scaled_curve_apply_advanced_parameters(rc_2pass2_t * rc)
1211  {  {
1212      int i;      int i;
1213      double total1, total2;          int64_t ivop_boost_total;
     uint64_t ivop_boost_total;  
1214    
1215      ivop_boost_total = 0;          /* Reset the rate controller (per frame type) total byte counters */
1216      rc->curve_comp_error = 0;          for (i=0; i<3; i++) rc->tot_scaled_length[i] = 0;
1217    
1218      for (i=0; i<3; i++) {          /* Compute total bytes for each frame type */
1219          rc->tot_scaled_length[i] = 0;          for (i=0; i<rc->num_frames;i++) {
1220                    twopass_stat_t *s = &rc->stats[i];
1221                    rc->tot_scaled_length[s->type-1] += s->scaled_length;
1222      }      }
1223    
1224            /* First we compute the total amount of bits needed, as being described by
1225             * the scaled distribution. During this pass over the complete stats data,
1226             * we see how much bits two user settings will get/give from/to p&b frames:
1227             *  - keyframe boosting
1228             *  - keyframe distance penalty */
1229            rc->KF_idx = 0;
1230            ivop_boost_total = 0;
1231      for (i=0; i<rc->num_frames; i++) {      for (i=0; i<rc->num_frames; i++) {
1232          stat_t * s = &rc->stats[i];                  twopass_stat_t * s = &rc->stats[i];
   
         rc->tot_scaled_length[s->type-1] += s->scaled_length;  
1233    
1234                    /* Some more work is needed for I frames */
1235          if (s->type == XVID_TYPE_IVOP) {          if (s->type == XVID_TYPE_IVOP) {
1236              ivop_boost_total += s->scaled_length * rc->param.keyframe_boost / 100;                          int ivop_boost;
         }  
     }  
1237    
1238      rc->movie_curve = ((double)(rc->tot_scaled_length[XVID_TYPE_PVOP-1] + rc->tot_scaled_length[XVID_TYPE_BVOP-1] + ivop_boost_total) /                          /* Accumulate bytes needed for keyframe boosting */
1239                                          (rc->tot_scaled_length[XVID_TYPE_PVOP-1] + rc->tot_scaled_length[XVID_TYPE_BVOP-1]));                          ivop_boost = s->scaled_length*rc->param.keyframe_boost/100;
1240    
1241      for(i=0; i<3; i++) {  #if 0 /* ToDo: decide how to apply kfthresholding */
1242          if (rc->count[i] == 0 || rc->movie_curve == 0) {  #endif
1243              rc->avg_length[i] = 1;                          /* If the frame size drops under the minimum length, then cap ivop_boost */
1244          }else{                          if (ivop_boost + s->scaled_length < rc->min_length[XVID_TYPE_IVOP-1])
1245              rc->avg_length[i] = rc->tot_scaled_length[i] / rc->count[i] / rc->movie_curve;                                  ivop_boost = rc->min_length[XVID_TYPE_IVOP-1] - s->scaled_length;
1246    
1247                            /* Accumulate the ivop boost */
1248                            ivop_boost_total += ivop_boost;
1249    
1250                            /* Don't forget to update the keyframe index */
1251                            rc->KF_idx++;
1252          }          }
1253      }      }
1254    
1255      /* alt curve stuff here */          /* Initialize the IBoost tax ratio for P/S/B frames
1256             *
1257             * This ratio has to be applied to p/b/s frames in order to reserve
1258             * additional bits for keyframes (keyframe boosting) or if too much
1259             * keyframe distance is applied, bits retrieved from the keyframes.
1260             *
1261             * ie pb_length *= rc->pb_iboost_tax_ratio;
1262             *
1263             *    gives the ideal length of a p/b frame */
1264    
1265      if (rc->param.use_alt_curve) {          /* Compute the total length of p/b/s frames (temporary storage into
1266          const double avg_pvop = rc->avg_length[XVID_TYPE_PVOP-1];           * movie_curve) */
1267          const uint64_t tot_pvop = rc->tot_length[XVID_TYPE_PVOP-1];          rc->pb_iboost_tax_ratio  = (double)rc->tot_scaled_length[XVID_TYPE_PVOP-1];
1268          const uint64_t tot_bvop = rc->tot_length[XVID_TYPE_BVOP-1];          rc->pb_iboost_tax_ratio += (double)rc->tot_scaled_length[XVID_TYPE_BVOP-1];
1269          const uint64_t tot_scaled_pvop = rc->tot_scaled_length[XVID_TYPE_PVOP-1];  
1270          const uint64_t tot_scaled_bvop = rc->tot_scaled_length[XVID_TYPE_BVOP-1];          /* Compute the ratio described above
1271             *     taxed_total = sum(0, n, tax*scaled_length)
1272             * <=> taxed_total = tax.sum(0, n, scaled_length)
1273             * <=> tax = taxed_total / original_total */
1274            rc->pb_iboost_tax_ratio =
1275                    (rc->pb_iboost_tax_ratio - ivop_boost_total) /
1276                    rc->pb_iboost_tax_ratio;
1277    
1278                  rc->alt_curve_low = avg_pvop - avg_pvop * (double)rc->param.alt_curve_low_dist / 100.0;          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- IFrame boost tax ratio:%.2f\n",
1279                  rc->alt_curve_low_diff = avg_pvop - rc->alt_curve_low;                          rc->pb_iboost_tax_ratio);
                 rc->alt_curve_high = avg_pvop + avg_pvop * (double)rc->param.alt_curve_high_dist / 100.0;  
                 rc->alt_curve_high_diff = rc->alt_curve_high - avg_pvop;  
1280    
1281          if (rc->param.alt_curve_use_auto) {          /* Compute the average size of frames per frame type */
1282              if (tot_bvop + tot_pvop > tot_scaled_bvop + tot_scaled_pvop) {          for(i=0; i<3; i++) {
1283                                  rc->param.alt_curve_min_rel_qual = (int)(100.0 - (100.0 - 100.0 /                  /* Special case for missing type or weird case */
1284                                          ((double)(tot_pvop + tot_bvop) / (double)(tot_scaled_pvop + tot_scaled_bvop))) * (double)rc->param.alt_curve_auto_str / 100.0);                  if (rc->count[i] == 0 || rc->pb_iboost_tax_ratio == 0) {
1285                            rc->avg_length[i] = 1;
1286                    } else {
1287                            rc->avg_length[i] = rc->tot_scaled_length[i];
1288    
1289                                  if (rc->param.alt_curve_min_rel_qual < 20)                          if (i == (XVID_TYPE_IVOP-1)) {
1290                                          rc->param.alt_curve_min_rel_qual = 20;                                  /* I Frames total has to be added the boost total */
1291                                    rc->avg_length[i] += ivop_boost_total;
1292              }else{              }else{
1293                                  rc->param.alt_curve_min_rel_qual = 100;                                  /* P/B frames has to taxed */
1294                                    rc->avg_length[i] *= rc->pb_iboost_tax_ratio;
1295              }              }
         }  
                 rc->alt_curve_mid_qual = (1.0 + (double)rc->param.alt_curve_min_rel_qual / 100.0) / 2.0;  
                 rc->alt_curve_qual_dev = 1.0 - rc->alt_curve_mid_qual;  
1296    
1297          if (rc->param.alt_curve_low_dist > 100) {                          /* Finally compute the average frame size */
1298                          switch(rc->param.alt_curve_type) {                          rc->avg_length[i] /= (double)rc->count[i];
             case XVID_CURVE_SINE: // Sine Curve (high aggressiveness)  
                                 rc->alt_curve_qual_dev *= 2.0 / (1.0 + sin(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff)));  
                                 rc->alt_curve_mid_qual = 1.0 - rc->alt_curve_qual_dev * sin(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff));  
                                 break;  
                         case XVID_CURVE_LINEAR: // Linear (medium aggressiveness)  
                                 rc->alt_curve_qual_dev *= 2.0 / (1.0 + avg_pvop / rc->alt_curve_low_diff);  
                                 rc->alt_curve_mid_qual = 1.0 - rc->alt_curve_qual_dev * avg_pvop / rc->alt_curve_low_diff;  
                                 break;  
                         case XVID_CURVE_COSINE: // Cosine Curve (low aggressiveness)  
                                 rc->alt_curve_qual_dev *= 2.0 / (1.0 + (1.0 - cos(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff))));  
                                 rc->alt_curve_mid_qual = 1.0 - rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff)));  
                         }  
1299                  }                  }
1300      }      }
1301    
1302      /* --- */          /* Assymetric curve compression */
1303            if (rc->param.curve_compression_high || rc->param.curve_compression_low) {
1304      total1=total2=0;                  double symetric_total;
1305                    double assymetric_delta_total;
1306    
1307                    /* Like I frame boosting, assymetric curve compression modifies the total
1308                     * amount of needed bits, we must compute the ratio so we can prescale
1309                     lengths */
1310                    symetric_total = 0;
1311                    assymetric_delta_total = 0;
1312      for (i=0; i<rc->num_frames; i++) {      for (i=0; i<rc->num_frames; i++) {
1313          stat_t * s = &rc->stats[i];                          double assymetric_delta;
1314                            double dbytes;
1315                            twopass_stat_t * s = &rc->stats[i];
1316    
1317          if (s->type != XVID_TYPE_IVOP) {                          /* I Frames are not concerned by assymetric scaling */
1318              double dbytes,dbytes2;                          if (s->type == XVID_TYPE_IVOP)
1319                                    continue;
1320    
1321              dbytes = s->scaled_length / rc->movie_curve;                          /* During the real run, we would have to apply the iboost tax */
1322              dbytes2 = 0; /* XXX: warning */                          dbytes = s->scaled_length * rc->pb_iboost_tax_ratio;
             total1 += dbytes;  
             if (s->type == XVID_TYPE_BVOP)  
                 dbytes *= rc->avg_length[XVID_TYPE_PVOP-1] / rc->avg_length[XVID_TYPE_BVOP-1];  
1323    
1324              if (rc->param.use_alt_curve) {                          /* Update the symmetric curve compression total */
1325                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                          symetric_total += dbytes;
1326    
1327                      if (dbytes >= rc->alt_curve_high) {                          /* Apply assymetric curve compression */
1328                                                  dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev);                          if (dbytes > rc->avg_length[s->type-1])
1329                      }else{                                  assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * (double)rc->param.curve_compression_high / 100.0f;
1330                                                  switch(rc->param.alt_curve_type) {                          else
1331                          case XVID_CURVE_SINE :                                  assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * (double)rc->param.curve_compression_low  / 100.0f;
                                                     dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * sin(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_high_diff)));  
                                                         break;  
                         case XVID_CURVE_LINEAR :  
                                                     dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) / rc->alt_curve_high_diff);  
                                                         break;  
                                                 case XVID_CURVE_COSINE :  
                                                     dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_high_diff))));  
                                                 }  
                                         }  
                 }else{  
                     if (dbytes <= rc->alt_curve_low) {  
                                                 dbytes2 = dbytes;  
                     }else{  
                                                 switch(rc->param.alt_curve_type) {  
                                                 case XVID_CURVE_SINE :  
                                                     dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * sin(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_low_diff)));  
                                                         break;  
                                                 case XVID_CURVE_LINEAR :  
                                                     dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) / rc->alt_curve_low_diff);  
                                                         break;  
                                                 case XVID_CURVE_COSINE :  
                                                     dbytes2 = dbytes * (rc->alt_curve_mid_qual + rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_low_diff))));  
                                                 }  
                                         }  
   
                 }  
1332    
1333                            /* Cap to the minimum frame size if needed */
1334                            if (dbytes + assymetric_delta < rc->min_length[s->type-1])
1335                                    assymetric_delta = rc->min_length[s->type-1] - dbytes;
1336    
1337              }else{                          /* Accumulate after assymetric curve compression */
1338                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                          assymetric_delta_total += assymetric_delta;
                     dbytes2=((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_high / 100.0);  
                 }else{  
                                 dbytes2 = ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_low / 100.0);  
                 }  
1339              }              }
1340    
1341              if (s->type == XVID_TYPE_BVOP) {                  /* Compute the tax that all p/b frames have to pay in order to respect the
1342                              dbytes2 *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];                   * bit distribution changes that the assymetric compression curve imposes
1343                              if (dbytes2 < rc->min_length[XVID_TYPE_BVOP-1])                   * We want assymetric_total = sum(0, n-1, tax.scaled_length)
1344                                      dbytes2 = rc->min_length[XVID_TYPE_BVOP-1];                   *      ie assymetric_total = ratio.sum(0, n-1, scaled_length)
1345                     *         ratio = assymetric_total / symmetric_total */
1346                    rc->assymetric_tax_ratio = ((double)symetric_total - (double)assymetric_delta_total) / (double)symetric_total;
1347              }else{              }else{
1348                              if (dbytes2 < rc->min_length[XVID_TYPE_PVOP-1])                  rc->assymetric_tax_ratio = 1.0f;
                                     dbytes2 = rc->min_length[XVID_TYPE_PVOP-1];  
             }  
             total2 += dbytes2;  
         }  
1349      }      }
1350    
1351      rc->curve_comp_scale = total1 / total2;          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Assymetric tax ratio:%.2f\n", rc->assymetric_tax_ratio);
1352    
1353      if (!rc->param.use_alt_curve) {          /* Last bits that need to be reset */
1354          DPRINTF(XVID_DEBUG_RC, "middle frame size for asymmetric curve compression: %i\n",          rc->overflow = 0;
1355              (int)(rc->avg_length[XVID_TYPE_PVOP-1] * rc->curve_comp_scale));          rc->KFoverflow = 0;
1356            rc->KFoverflow_partial = 0;
1357            rc->KF_idx = 0;
1358            rc->desired_total = 0;
1359            rc->real_total = 0;
1360    
1361            /* Job done */
1362            return;
1363      }      }
1364    
1365      if (rc->param.use_alt_curve) {  /*****************************************************************************
1366          int bonus_bias = rc->param.alt_curve_bonus_bias;   * Still more low level stuff (nothing to do with stats treatment)
1367          int oldquant = 1;   ****************************************************************************/
1368    
1369              if (rc->param.alt_curve_use_auto_bonus_bias)  /* This function returns an allocated string containing a complete line read
1370                      bonus_bias = rc->param.alt_curve_min_rel_qual;   * from the file starting at the current position */
1371    static char *
1372    readline(FILE *f)
1373    {
1374            char *buffer = NULL;
1375            int buffer_size = 0;
1376            int pos = 0;
1377    
1378              rc->alt_curve_curve_bias_bonus = (total1 - total2) * (double)bonus_bias / 100.0 / (double)(rc->num_frames /* - credits_frames */ - rc->num_keyframes);          do {
1379              rc->curve_comp_scale = ((total1 - total2) * (1.0 - (double)bonus_bias / 100.0) + total2) / total2;                  int c;
1380    
1381                    /* Read a character from the stream */
1382                    c = fgetc(f);
1383    
1384          /* special info for alt curve:  bias bonus and quantizer thresholds */                  /* Is that EOF or new line ? */
1385                    if(c == EOF || c == '\n')
1386                            break;
1387    
1388                  DPRINTF(XVID_DEBUG_RC, "avg scaled framesize:%i\n", (int)rc->avg_length[XVID_TYPE_PVOP-1]);                  /* Do we have to update buffer ? */
1389                  DPRINTF(XVID_DEBUG_RC, "bias bonus:%i bytes\n", (int)rc->alt_curve_curve_bias_bonus);                  if(pos >= buffer_size - 1) {
1390                            buffer_size += BUF_SZ;
1391                            buffer = (char*)realloc(buffer, buffer_size);
1392                            if (buffer == NULL)
1393                                    return(NULL);
1394                    }
1395    
1396                  for (i=1; i <= (int)(rc->alt_curve_high*2)+1; i++) {                  buffer[pos] = c;
1397              double curve_temp, dbytes;                  pos++;
1398              int newquant;          } while(1);
1399    
1400              dbytes = i;          /* Read \n or EOF */
1401                          if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {          if (buffer == NULL) {
1402                  if (dbytes >= rc->alt_curve_high) {                  /* EOF, so we reached the end of the file, return NULL */
1403                                          curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev);                  if(feof(f))
1404                  }else{                          return(NULL);
1405                                          switch(rc->param.alt_curve_type)  
1406                                          {                  /* Just an empty line with just a newline, allocate a 1 byte buffer to
1407                                          case XVID_CURVE_SINE :                   * store a zero length string */
1408                                                  curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * sin(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_high_diff)));                  buffer = (char*)malloc(1);
1409                                                  break;                  if(buffer == NULL)
1410                                          case XVID_CURVE_LINEAR :                          return(NULL);
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) / rc->alt_curve_high_diff);  
                                                 break;  
                                         case XVID_CURVE_COSINE :  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_high_diff))));  
1411                                          }                                          }
1412    
1413            /* Zero terminated string */
1414            buffer[pos] = '\0';
1415    
1416            return(buffer);
1417                                  }                                  }
1418                          }else{  
1419                  if (dbytes <= rc->alt_curve_low) {  /* This function returns a pointer to the first non space char in the given
1420                                          curve_temp = dbytes;   * string */
1421                  }else{  static char *
1422                                          switch(rc->param.alt_curve_type)  skipspaces(char *string)
1423                                          {                                          {
1424                                          case XVID_CURVE_SINE :          const char spaces[] =
1425                                                  curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * sin(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_low_diff)));                  {
1426                                                  break;                          ' ','\t','\0'
1427                                          case XVID_CURVE_LINEAR :                  };
1428                                                  curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) / rc->alt_curve_low_diff);          const char *spacechar = spaces;
1429    
1430            if (string == NULL) return(NULL);
1431    
1432            while (*string != '\0') {
1433                    /* Test against space chars */
1434                    while (*spacechar != '\0') {
1435                            if (*string == *spacechar) {
1436                                    string++;
1437                                    spacechar = spaces;
1438                                                  break;                                                  break;
                                         case XVID_CURVE_COSINE :  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual + rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_low_diff))));  
                                         }  
1439                                  }                                  }
1440                            spacechar++;
1441                          }                          }
1442    
1443                          if (rc->movie_curve > 1.0)                  /* No space char */
1444                                  dbytes *= rc->movie_curve;                  if (*spacechar == '\0') return(string);
1445            }
1446    
1447                          newquant = (int)(dbytes * 2.0 / (curve_temp * rc->curve_comp_scale + rc->alt_curve_curve_bias_bonus));          return(string);
                         if (newquant > 1) {  
                                 if (newquant != oldquant) {  
                     int percent = (int)((i - rc->avg_length[XVID_TYPE_PVOP-1]) * 100.0 / rc->avg_length[XVID_TYPE_PVOP-1]);  
                                         oldquant = newquant;  
                                         DPRINTF(XVID_DEBUG_RC, "quant:%i threshold at %i : %i percent\n", newquant, i, percent);  
1448                                  }                                  }
1449    
1450    /* This function returns a boolean that tells if the string is only a
1451     * comment */
1452    static int
1453    iscomment(char *string)
1454    {
1455            const char comments[] =
1456                    {
1457                            '#',';', '%', '\0'
1458                    };
1459            const char *cmtchar = comments;
1460            int iscomment = 0;
1461    
1462            if (string == NULL) return(1);
1463    
1464            string = skipspaces(string);
1465    
1466            while(*cmtchar != '\0') {
1467                    if(*string == *cmtchar) {
1468                            iscomment = 1;
1469                            break;
1470                          }                          }
1471                    cmtchar++;
1472                  }                  }
1473    
1474            return(iscomment);
1475      }      }
1476    
1477      rc->overflow = 0;  #if 0
1478      rc->KFoverflow = 0;  static void
1479      rc->KFoverflow_partial = 0;  stats_print(rc_2pass2_t * rc)
1480      rc->KF_idx = 1;  {
1481            int i;
1482            const char frame_type[4] = { 'i', 'p', 'b', 's'};
1483    
1484            for (i=0; i<rc->num_frames; i++) {
1485                    twopass_stat_t *s = &rc->stats[i];
1486                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- frame:%d type:%c quant:%d stats:%d scaled:%d desired:%d actual:%d overflow(%c):%.2f\n",
1487                                    i, frame_type[s->type-1], -1, s->length, s->scaled_length,
1488                                    s->desired_length, -1, frame_type[s->type-1], -1.0f);
1489  }  }
1490    }
1491    #endif
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