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revision 1037, Thu May 22 10:57:33 2003 UTC revision 1296, Sun Dec 21 17:38:17 2003 UTC
# Line 1  Line 1 
1  /******************************************************************************  /******************************************************************************
2   *   *
3   * XviD Bit Rate Controller Library   * XviD Bit Rate Controller Library
4   * - VBR 2 pass bitrate controler implementation -   *  - VBR 2 pass bitrate controller implementation -
5   *   *
6   * Copyright (C)      2002 Foxer <email?>   * Copyright (C)      2002 Foxer <email?>
7   *                    2002 Dirk Knop <dknop@gwdg.de>   *                    2002 Dirk Knop <dknop@gwdg.de>
# 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 1.1.2.7 2003-05-22 10:57:33 edgomez Exp $   * $Id: plugin_2pass2.c,v 1.1.2.33 2003-12-21 17:38:17 edgomez Exp $
29   *   *
30   *****************************************************************************/   *****************************************************************************/
31    
32    #define BQUANT_PRESCALE
33    #undef COMPENSATE_FORMULA
34    
35    /* forces second pass not to be bigger than first */
36    #undef PASS_SMALLER
37    
38  #include <stdio.h>  #include <stdio.h>
39  #include <math.h>  #include <math.h>
40    #include <limits.h>
 #define RAD2DEG 57.295779513082320876798154814105  
 #define DEG2RAD 0.017453292519943295769236907684886  
41    
42  #include "../xvid.h"  #include "../xvid.h"
43  #include "../image/image.h"  #include "../image/image.h"
44    
45    /*****************************************************************************
46     * Some default settings
47     ****************************************************************************/
48    
49    #define DEFAULT_KEYFRAME_BOOST 0
50    #define DEFAULT_OVERFLOW_CONTROL_STRENGTH 10
51    #define DEFAULT_CURVE_COMPRESSION_HIGH 0
52    #define DEFAULT_CURVE_COMPRESSION_LOW 0
53    #define DEFAULT_MAX_OVERFLOW_IMPROVEMENT 10
54    #define DEFAULT_MAX_OVERFLOW_DEGRADATION 10
55    
56    /* Keyframe settings */
57    #define DEFAULT_KFREDUCTION 20
58    #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
72     ****************************************************************************/
73    
74    /* Statistics */
75  typedef struct {  typedef struct {
76      int type;               /* first pass type */      int type;               /* first pass type */
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      int * keyframe_locations;          /* Total length of each frame types (1st pass) */
111      stat_t * stats;          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      double pquant_error[32];          /*----------------------------------
132      double bquant_error[32];           * Zones statistical data
133      int quant_count[32];           *
134      int last_quant[3];           * ToDo: Fix zones, current
135             *       implementation is buggy
136             *--------------------------------*/
137    
138            /* Average weight of the zones */
139            double avg_weight;
140    
141            /* Total length used by XVID_ZONE_QUANT zones */
142            uint64_t tot_quant;
143            uint64_t tot_quant_invariant;
144    
145            /*----------------------------------
146             * Advanced settings helper ratios
147             *--------------------------------*/
148    
149            /* This the ratio that has to be applied to all p/b frames in order
150             * to reserve/retrieve bits for/from keyframe boosting and consecutive
151             * keyframe penalty */
152            double pb_iboost_tax_ratio;
153    
154            /* This the ratio to apply to all b/p frames in order to respect the
155             * assymetric curve compression while respecting a target filesize
156             * NB: The assymetric delta gain has to be computed before this ratio
157             *     is applied, and then the delta is added to the scaled size */
158            double assymetric_tax_ratio;
159    
160            /*----------------------------------
161             * Data from the stats file kept
162             * into RAM for easy access
163             *--------------------------------*/
164    
165            /* Array of keyframe locations
166             * eg: rc->keyframe_locations[100] returns the frame number of the 100th
167             *     keyframe */
168            int *keyframe_locations;
169    
170      double curve_comp_error;          /* Index of the last keyframe used in the keyframe_location */
     int overflow;  
     int KFoverflow;  
     int KFoverflow_partial;  
171      int KF_idx;      int KF_idx;
172    
173      double fq_error;          /* Array of all 1st pass data file -- see the twopass_stat_t structure
174  } rc_2pass2_t;           * definition for more details */
175            twopass_stat_t * stats;
176    
177            /*----------------------------------
178             * Histerysis helpers
179             *--------------------------------*/
180    
181            /* This field holds the int2float conversion errors of each quant per
182             * frame type, this allow the RC to keep track of rouding error and thus
183             * increase or decrease the chosen quant according to this residue */
184            double quant_error[3][32];
185    
186            /* This fields stores the count of each quant usage per frame type
187             * No real role but for debugging */
188            int quant_count[3][32];
189    
190            /* Last valid quantizer used per frame type, it allows quantizer
191             * increament/decreament limitation in order to avoid big image quality
192             * "jumps" */
193            int last_quant[3];
194    
195            /*----------------------------------
196             * Overflow control
197             *--------------------------------*/
198    
199            /* Current overflow that has to be distributed to p/b frames */
200            double overflow;
201    
202            /* Total overflow for keyframes -- not distributed directly */
203            double KFoverflow;
204    
205            /* Amount of keyframe overflow to introduce to the global p/b frame
206             * overflow counter at each encoded frame */
207            double KFoverflow_partial;
208    
209            /* Unknown ???
210             * ToDo: description */
211            double fq_error;
212    
213  #define BUF_SZ 1024          /*----------------------------------
214  #define MAX_COLS    5           * Debug
215             *--------------------------------*/
216            double desired_total;
217            double real_total;
218    } rc_2pass2_t;
219    
220    
221  /* open stats file, and count num frames */  /*****************************************************************************
222     * Sub plugin functions prototypes
223     ****************************************************************************/
224    
225    static int rc_2pass2_create(xvid_plg_create_t * create, rc_2pass2_t ** handle);
226    static int rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data);
227    static int rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data);
228    static int rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy);
229    
230    /*****************************************************************************
231     * Plugin definition
232     ****************************************************************************/
233    
234  static int det_stats_length(rc_2pass2_t * rc, char * filename)  int
235    xvid_plugin_2pass2(void * handle, int opt, void * param1, void * param2)
236  {  {
237      FILE * f;          switch(opt) {
238      int n, ignore;          case XVID_PLG_INFO :
239      char type;          case XVID_PLG_FRAME :
240                    return 0;
241    
242      rc->num_frames = 0;          case XVID_PLG_CREATE :
243      rc->num_keyframes = 0;                  return rc_2pass2_create((xvid_plg_create_t*)param1, param2);
244    
245      if ((f = fopen(filename, "rt")) == NULL)          case XVID_PLG_DESTROY :
246          return 0;                  return rc_2pass2_destroy((rc_2pass2_t*)handle, (xvid_plg_destroy_t*)param1);
247    
248      while((n = fscanf(f, "%c %d %d %d %d %d %d\n",          case XVID_PLG_BEFORE :
249          &type, &ignore, &ignore, &ignore, &ignore, &ignore, &ignore)) != EOF) {                  return rc_2pass2_before((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);
250          if (type == 'i') {  
251              rc->num_frames++;          case XVID_PLG_AFTER :
252              rc->num_keyframes++;                  return rc_2pass2_after((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);
         }else if (type == 'p' || type == 'b' || type == 's') {  
             rc->num_frames++;  
253          }          }
254    
255            return XVID_ERR_FAIL;
256      }      }
257    
258      fclose(f);  /*****************************************************************************
259     * Sub plugin functions definitions
260     ****************************************************************************/
261    
262    /* First a few local helping function prototypes */
263    static  int statsfile_count_frames(rc_2pass2_t * rc, char * filename);
264    static  int statsfile_load(rc_2pass2_t *rc, char * filename);
265    static void zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create);
266    static void first_pass_stats_prepare_data(rc_2pass2_t * rc);
267    static void first_pass_scale_curve_internal(rc_2pass2_t *rc);
268    static void scaled_curve_apply_advanced_parameters(rc_2pass2_t * rc);
269    #if 0
270    static void stats_print(rc_2pass2_t * rc);
271    #endif
272    
273      return 1;  /*----------------------------------------------------------------------------
274  }   *--------------------------------------------------------------------------*/
275    
276    static int
277    rc_2pass2_create(xvid_plg_create_t * create, rc_2pass2_t **handle)
278    {
279            xvid_plugin_2pass2_t * param = (xvid_plugin_2pass2_t *)create->param;
280            rc_2pass2_t * rc;
281            int i;
282    
283            rc = malloc(sizeof(rc_2pass2_t));
284            if (rc == NULL)
285                    return XVID_ERR_MEMORY;
286    
287  /* open stats file(s) and read into rc->stats array */          rc->param = *param;
288    
289  static int load_stats(rc_2pass2_t *rc, char * filename)          /* Initialize all defaults */
290  {  #define _INIT(a, b) if((a) <= 0) (a) = (b)
291      FILE * f;          /* Let's set our defaults if needed */
292      int i, not_scaled;          _INIT(rc->param.keyframe_boost, DEFAULT_KEYFRAME_BOOST);
293            _INIT(rc->param.overflow_control_strength, DEFAULT_OVERFLOW_CONTROL_STRENGTH);
294            _INIT(rc->param.curve_compression_high, DEFAULT_CURVE_COMPRESSION_HIGH);
295            _INIT(rc->param.curve_compression_low, DEFAULT_CURVE_COMPRESSION_LOW);
296            _INIT(rc->param.max_overflow_improvement, DEFAULT_MAX_OVERFLOW_IMPROVEMENT);
297            _INIT(rc->param.max_overflow_degradation,  DEFAULT_MAX_OVERFLOW_DEGRADATION);
298    
299            /* Keyframe settings */
300            _INIT(rc->param.kfreduction, DEFAULT_KFREDUCTION);
301            _INIT(rc->param.kfthreshold, DEFAULT_KFTHRESHOLD);
302    #undef _INIT
303    
304            /* Initialize some stuff to zero */
305            for(i=0; i<3; i++) {
306                    int j;
307                    for (j=0; j<32; j++) {
308                            rc->quant_error[i][j] = 0;
309                            rc->quant_count[i][j] = 0;
310                    }
311            }
312    
313      if ((f = fopen(filename, "rt"))==NULL)          for (i=0; i<3; i++) rc->last_quant[i] = 0;
         return 0;  
314    
315      i = 0;          rc->fq_error = 0;
         not_scaled = 0;  
     while(i < rc->num_frames) {  
         stat_t * s = &rc->stats[i];  
         int n;  
         char type;  
316    
317                  s->scaled_length = 0;          /* Count frames (and intra frames) in the stats file, store the result into
318          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);           * the rc structure */
319          if (n == EOF) break;          if (statsfile_count_frames(rc, param->filename) == -1) {
320                  if (n < 7) {                  DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- ERROR: fopen %s failed\n", param->filename);
321                          not_scaled = 1;                  free(rc);
322                    return(XVID_ERR_FAIL);
323                  }                  }
324    
325          if (type == 'i') {          /* Allocate the stats' memory */
326              s->type = XVID_TYPE_IVOP;          if ((rc->stats = malloc(rc->num_frames * sizeof(twopass_stat_t))) == NULL) {
327          }else if (type == 'p' || type == 's') {                  free(rc);
328              s->type = XVID_TYPE_PVOP;                  return(XVID_ERR_MEMORY);
         }else if (type == 'b') {  
             s->type = XVID_TYPE_BVOP;  
         }else{  /* unknown type */  
             DPRINTF(XVID_DEBUG_RC, "unknown stats frame type; assuming pvop");  
             s->type = XVID_TYPE_PVOP;  
329          }          }
330    
331          i++;          /* Allocate keyframes location's memory
332             * PS: see comment in pre_process0 for the +1 location requirement */
333            rc->keyframe_locations = malloc((rc->num_keyframes + 1) * sizeof(int));
334            if (rc->keyframe_locations == NULL) {
335                    free(rc->stats);
336                    free(rc);
337                    return(XVID_ERR_MEMORY);
338      }      }
339    
340      rc->num_frames = i;          /* Load the first pass stats */
341            if (statsfile_load(rc, param->filename) == -1) {
342                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- ERROR: fopen %s failed\n", param->filename);
343                    free(rc->keyframe_locations);
344                    free(rc->stats);
345                    free(rc);
346                    return XVID_ERR_FAIL;
347            }
348    
349          fclose(f);          /* Compute the target filesize */
350            if (rc->param.bitrate<0) {
351                    /* if negative, bitrate equals the target (in kbytes) */
352                    rc->target = ((uint64_t)(-rc->param.bitrate)) * 1024;
353            } else if (rc->num_frames  < create->fbase/create->fincr) {
354                    /* Source sequence is less than 1s long, we do as if it was 1s long */
355                    rc->target = rc->param.bitrate / 8;
356            } else {
357                    /* Target filesize = bitrate/8 * numframes / framerate */
358                    rc->target =
359                            ((uint64_t)rc->param.bitrate * (uint64_t)rc->num_frames * \
360                             (uint64_t)create->fincr) / \
361                            ((uint64_t)create->fbase * 8);
362            }
363    
364            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Frame rate: %d/%d (%ffps)\n",
365                            create->fbase, create->fincr,
366                            (double)create->fbase/(double)create->fincr);
367            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Number of frames: %d\n", rc->num_frames);
368            if(rc->param.bitrate>=0)
369                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Target bitrate: %ld\n", rc->param.bitrate);
370            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Target filesize: %lld\n", rc->target);
371    
372            /* Compensate the average frame overhead caused by the container */
373            rc->target -= rc->num_frames*rc->param.container_frame_overhead;
374            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Container Frame overhead: %d\n", rc->param.container_frame_overhead);
375            if(rc->param.container_frame_overhead)
376                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- New target filesize after container compensation: %lld\n", rc->target);
377    
378            /* Gathers some information about first pass stats:
379             *  - finds the minimum frame length for each frame type during 1st pass.
380             *     rc->min_size[]
381             *  - determines the maximum frame length observed (no frame type distinction).
382             *     rc->max_size
383             *  - count how many times each frame type has been used.
384             *     rc->count[]
385             *  - total bytes used per frame type
386             *     rc->tot_length[]
387             *  - total bytes considered invariant between the 2 passes
388             *  - store keyframe location
389             *     rc->keyframe_locations[]
390             */
391            first_pass_stats_prepare_data(rc);
392    
393      return 1;          /* When bitrate is not given it means it has been scaled by an external
394             * application */
395            if (rc->param.bitrate) {
396                    /* Apply zone settings
397                     * - set rc->tot_quant which represents the total num of bytes spent in
398                     *   fixed quant zones
399                     * - set rc->tot_quant_invariant which represents the total num of bytes spent
400                     *   in fixed quant zones for headers */
401                    zone_process(rc, create);
402                    /* Perform internal curve scaling */
403                    first_pass_scale_curve_internal(rc);
404            } else {
405                    /* External scaling -- zones are ignored */
406                    for (i=0;i<rc->num_frames;i++) {
407                            rc->stats[i].zone_mode = XVID_ZONE_WEIGHT;
408                            rc->stats[i].weight = 1.0;
409                    }
410                    rc->avg_weight = 1.0;
411                    rc->tot_quant = 0;
412  }  }
413    
414            /* Apply advanced curve options, and compute some parameters in order to
415             * shape the curve in the BEFORE/AFTER pair of functions */
416            scaled_curve_apply_advanced_parameters(rc);
417    
418            *handle = rc;
419            return(0);
420    }
421    
422    /*----------------------------------------------------------------------------
423     *--------------------------------------------------------------------------*/
424    
425  #if 0  static int
426  static void print_stats(rc_2pass2_t * rc)  rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy)
427  {  {
428      int i;          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- target_total:%lld desired_total:%.2f (%.2f%%) actual_total:%.2f (%.2f%%)\n",
429      for (i = 0; i < rc->num_frames; i++) {                          rc->target,
430          stat_t * s = &rc->stats[i];                          rc->desired_total,
431          DPRINTF(XVID_DEBUG_RC, "%i %i %i %i\n", s->type, s->quant, s->length, s->scaled_length);                          100*rc->desired_total/(double)rc->target,
432      }                          rc->real_total,
433                            100*rc->real_total/(double)rc->target);
434    
435            free(rc->keyframe_locations);
436            free(rc->stats);
437            free(rc);
438            return(0);
439  }  }
 #endif  
440    
441  /* pre-process the statistics data  /*----------------------------------------------------------------------------
442      - for each type, count, tot_length, min_length, max_length   *--------------------------------------------------------------------------*/
     - set keyframes_locations  
 */  
443    
444  void pre_process0(rc_2pass2_t * rc)  static int
445    rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)
446  {  {
447      int i,j;          twopass_stat_t * s = &rc->stats[data->frame_num];
448            double dbytes;
449            double scaled_quant;
450            double overflow;
451            int capped_to_max_framesize = 0;
452    
453      for (i=0; i<3; i++) {          /* This function is quite long but easy to understand. In order to simplify
454          rc->count[i]=0;           * the code path (a bit), we treat 3 cases that can return immediatly. */
455          rc->tot_length[i] = 0;  
456          rc->last_quant[i] = 0;          /* First case: Another plugin has already set a quantizer */
457            if (data->quant > 0)
458                    return(0);
459    
460            /* Second case: insufficent stats data
461             * We can't guess much what we should do, let core decide all alone */
462            if (data->frame_num >= rc->num_frames) {
463                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- stats file too short (now processing frame %d)",
464                            data->frame_num);
465                    return(0);
466      }      }
467    
468      for (i=j=0; i<rc->num_frames; i++) {          /* Third case: We are in a Quant zone
469          stat_t * s = &rc->stats[i];           * Quant zones must just ensure we use the same settings as first pass
470             * So set the quantizer and the type */
471            if (s->zone_mode == XVID_ZONE_QUANT) {
472                    /* Quant stuff */
473                    rc->fq_error += s->weight;
474                    data->quant = (int)rc->fq_error;
475                    rc->fq_error -= data->quant;
476    
477          rc->count[s->type-1]++;                  /* The type stuff */
478          rc->tot_length[s->type-1] += s->length;                  data->type = s->type;
479    
480          if (i == 0 || s->length < rc->min_length[s->type-1]) {                  /* The only required data for AFTER step is this one for the overflow
481              rc->min_length[s->type-1] = s->length;                   * control */
482          }                  s->desired_length = s->length;
483    
484          if (i == 0 || s->length > rc->max_length) {                  return(0);
             rc->max_length = s->length;  
485          }          }
486    
         if (s->type == XVID_TYPE_IVOP) {  
             rc->keyframe_locations[j] = i;  
             j++;  
         }  
     }  
487    
488          /*          /*************************************************************************/
489           * The "per sequence" overflow system considers a natural sequence to be          /*************************************************************************/
490           * formed by all frames between two iframes, so if we want to make sure          /*************************************************************************/
          * the system does not go nuts during last sequence, we force the last  
          * frame to appear in the keyframe locations array.  
          */  
     rc->keyframe_locations[j] = i;  
 }  
491    
492            /*-------------------------------------------------------------------------
493             * Frame bit allocation first part
494             *
495             * First steps apply user settings, just like it is done in the theoritical
496             * scaled_curve_apply_advanced_parameters
497             *-----------------------------------------------------------------------*/
498    
499  /* calculate zone weight "center" */          /* Set desired to what we are wanting to obtain for this frame */
500            dbytes = (double)s->scaled_length;
501    
502  static void zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)          /* IFrame user settings*/
503  {          if (s->type == XVID_TYPE_IVOP) {
504      int i,j;                  /* Keyframe boosting -- All keyframes benefit from it */
505      int n = 0;                  dbytes += dbytes*rc->param.keyframe_boost / 100;
506    
507      rc->avg_weight = 0.0;  #if 0 /* ToDo: decide how to apply kfthresholding */
508      rc->tot_quant = 0;  #endif
509            } else {
510    
511                    /* P/S/B frames must reserve some bits for iframe boosting */
512                    dbytes *= rc->pb_iboost_tax_ratio;
513    
514      if (create->num_zones == 0) {                  /* Apply assymetric curve compression */
515          for (j = 0; j < rc->num_frames; j++) {                  if (rc->param.curve_compression_high || rc->param.curve_compression_low) {
516              rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;                          double assymetric_delta;
517              rc->stats[j].weight = 1.0;  
518                            /* Compute the assymetric delta, this is computed before applying
519                             * the tax, as done in the pre_process function */
520                            if (dbytes > rc->avg_length[s->type-1])
521                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_high / 100.0;
522                            else
523                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_low  / 100.0;
524    
525                            /* Now we must apply the assymetric tax, else our curve compression
526                             * would not give a theoritical target size equal to what it is
527                             * expected */
528                            dbytes *= rc->assymetric_tax_ratio;
529    
530                            /* Now we can add the assymetric delta */
531                            dbytes += assymetric_delta;
532          }          }
         rc->avg_weight += rc->num_frames * 1.0;  
         n += rc->num_frames;  
533      }      }
534    
535            /* That is what we would like to have -- Don't put that chunk after
536             * overflow control, otherwise, overflow is counted twice and you obtain
537             * half sized bitrate sequences */
538            s->desired_length  = (int)dbytes;
539            rc->desired_total += dbytes;
540    
541      for(i=0; i < create->num_zones; i++) {          /*------------------------------------------------------------------------
542             * Frame bit allocation: overflow control part.
543             *
544             * Unlike the theoritical scaled_curve_apply_advanced_parameters, here
545             * it's real encoding and we need to make sure we don't go so far from
546             * what is our ideal scaled curve.
547             *-----------------------------------------------------------------------*/
548    
549            /* Compute the overflow we should compensate */
550            if (s->type != XVID_TYPE_IVOP || rc->overflow > 0) {
551                    double frametype_factor;
552                    double framesize_factor;
553    
554          int next = (i+1<create->num_zones) ? create->zones[i+1].frame : rc->num_frames;                  /* Take only the desired part of overflow */
555                    overflow = rc->overflow;
556    
557          if (i==0 && create->zones[i].frame > 0) {                  /* Factor that will take care to decrease the overflow applied
558              for (j = 0; j < create->zones[i].frame && j < rc->num_frames; j++) {                   * according to the importance of this frame type in term of
559                  rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;                   * overall size */
560                  rc->stats[j].weight = 1.0;                  frametype_factor  = rc->count[XVID_TYPE_IVOP-1]*rc->avg_length[XVID_TYPE_IVOP-1];
561              }                  frametype_factor += rc->count[XVID_TYPE_PVOP-1]*rc->avg_length[XVID_TYPE_PVOP-1];
562              rc->avg_weight += create->zones[i].frame * 1.0;                  frametype_factor += rc->count[XVID_TYPE_BVOP-1]*rc->avg_length[XVID_TYPE_BVOP-1];
563              n += create->zones[i].frame;                  frametype_factor /= rc->count[s->type-1]*rc->avg_length[s->type-1];
564          }                  frametype_factor  = 1/frametype_factor;
565    
566                    /* Factor that will take care not to compensate too much for this frame
567                     * size */
568                    framesize_factor  = dbytes;
569                    framesize_factor /= rc->avg_length[s->type-1];
570    
571          if (create->zones[i].mode == XVID_ZONE_WEIGHT) {                  /* Treat only the overflow part concerned by this frame type and size */
572              for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {                  overflow *= frametype_factor;
573                  rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;  #if 0
574                  rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;                  /* Leave this one alone, as it impacts badly on quality */
575              }                  overflow *= framesize_factor;
576              next -= create->zones[i].frame;  #endif
577              rc->avg_weight += (double)(next * create->zones[i].increment) / (double)create->zones[i].base;  
578              n += next;                  /* Apply the overflow strength imposed by the user */
579          }else{  // XVID_ZONE_QUANT                  overflow *= (rc->param.overflow_control_strength/100.0f);
580              for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {          } else {
581                  rc->stats[j].zone_mode = XVID_ZONE_QUANT;                  /* no negative overflow applied in IFrames because:
582                  rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;                   *  - their role is important as they're references for P/BFrames.
583                  rc->tot_quant += rc->stats[j].length;                   *  - there aren't much in typical sequences, so if an IFrame overflows too
584              }                   *    much, this overflow may impact the next IFrame too much and generate
585                     *    a sequence of poor quality frames */
586                    overflow = 0;
587          }          }
588    
589            /* Make sure we are not trying to compensate more overflow than we even have */
590            if (fabs(overflow) > fabs(rc->overflow))
591                    overflow = rc->overflow;
592    
593            /* Make sure the overflow doesn't make the frame size to get out of the range
594             * [-max_degradation..+max_improvment] */
595            if (overflow > dbytes*rc->param.max_overflow_improvement / 100) {
596                    if(overflow <= dbytes)
597                            dbytes += dbytes * rc->param.max_overflow_improvement / 100;
598                    else
599                            dbytes += overflow * rc->param.max_overflow_improvement / 100;
600            } else if (overflow < - dbytes * rc->param.max_overflow_degradation / 100) {
601                    dbytes -= dbytes * rc->param.max_overflow_degradation / 100;
602            } else {
603                    dbytes += overflow;
604      }      }
     rc->avg_weight = n>0 ? rc->avg_weight/n : 1.0;  
605    
606      DPRINTF(XVID_DEBUG_RC, "center_weight: %f (for %i frames);   fixed_bytes: %i\n", rc->avg_weight, n, rc->tot_quant);          /*-------------------------------------------------------------------------
607             * Frame bit allocation last part:
608             *
609             * Cap frame length so we don't reach neither bigger frame sizes than first
610             * pass nor smaller than the allowed minimum.
611             *-----------------------------------------------------------------------*/
612    
613    #ifdef PASS_SMALLER
614            if (dbytes > s->length) {
615                    dbytes = s->length;
616            } else
617    #endif
618                    if (dbytes < rc->min_length[s->type-1]) {
619                    dbytes = rc->min_length[s->type-1];
620            } else if (dbytes > rc->max_length) {
621                    /* ToDo: this condition is always wrong as max_length == maximum frame
622                     * length of first pass, so the first condition already caps the frame
623                     * size... */
624                    capped_to_max_framesize = 1;
625                    dbytes = rc->max_length;
626                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- frame:%d Capped to maximum frame size\n",
627                                    data->frame_num);
628  }  }
629    
630            /*------------------------------------------------------------------------
631             * Desired frame length <-> quantizer mapping
632             *-----------------------------------------------------------------------*/
633    
634  /* scale the curve */  #ifdef BQUANT_PRESCALE
635            /* For bframes we prescale the quantizer to avoid too high quant scaling */
636            if(s->type == XVID_TYPE_BVOP) {
637    
638  static void internal_scale(rc_2pass2_t *rc)                  twopass_stat_t *b_ref = s;
 {  
         int64_t target  = rc->target - rc->tot_quant;  
         int64_t pass1_length = rc->tot_length[0] + rc->tot_length[1] + rc->tot_length[2] - rc->tot_quant;  
         int min_size[3];  
         double scaler;  
         int i;  
639    
640                    /* Find the reference frame */
641                    while(b_ref != &rc->stats[0] && b_ref->type == XVID_TYPE_BVOP)
642                            b_ref--;
643    
644                    /* Compute the original quant */
645                    s->quant  = 2*(100*s->quant - data->bquant_offset);
646                    s->quant += data->bquant_ratio - 1; /* to avoid rounding issues */
647                    s->quant  = s->quant/data->bquant_ratio - b_ref->quant;
648            }
649    #endif
650    
651          /* perform an initial scale pass.          /* Don't laugh at this very 'simple' quant<->size relationship, it
652             if a frame size is scaled underneath our hardcoded minimums, then we force the           * proves to be acurate enough for our algorithm */
653             frame size to the minimum, and deduct the original & scaled frmae length from the          scaled_quant = (double)s->quant*(double)s->length/(double)dbytes;
654             original and target total lengths */  
655    #ifdef COMPENSATE_FORMULA
656          min_size[0] = ((rc->stats[0].blks[0]*22) + 240) / 8;          /* We know xvidcore will apply the bframe formula again, so we compensate
657          min_size[1] = (rc->stats[0].blks[0] + 88) / 8;           * it right now to make sure we would not apply it twice */
658          min_size[2] = 8;          if(s->type == XVID_TYPE_BVOP) {
659    
660          scaler = (double)target / (double)pass1_length;                  twopass_stat_t *b_ref = s;
661    
662          if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {                  /* Find the reference frame */
663                  DPRINTF(XVID_DEBUG_RC, "undersize warning\n");                  while(b_ref != &rc->stats[0] && b_ref->type == XVID_TYPE_BVOP)
664          scaler = 1.0;                          b_ref--;
665    
666                    /* Compute the quant it would be if the core did not apply the bframe
667                     * formula */
668                    scaled_quant  = 100*scaled_quant - data->bquant_offset;
669                    scaled_quant += data->bquant_ratio - 1; /* to avoid rouding issues */
670                    scaled_quant /= data->bquant_ratio;
671          }          }
672    #endif
673    
674      DPRINTF(XVID_DEBUG_RC, "target=%i, tot_length=%i, scaler=%f\n", (int)target, (int)pass1_length, scaler);          /* Quantizer has been scaled using floating point operations/results, we
675             * must cast it to integer */
676          for (i=0; i<rc->num_frames; i++) {          data->quant = (int)scaled_quant;
                 stat_t * s = &rc->stats[i];  
                 int len;  
677    
678          if (s->zone_mode == XVID_ZONE_QUANT) {          /* Let's clip the computed quantizer, if needed */
679              s->scaled_length = s->length;          if (data->quant < 1) {
680          }else {                  data->quant = 1;
681                      len = (int)((double)s->length * scaler * s->weight / rc->avg_weight);          } else if (data->quant > 31) {
682                      if (len < min_size[s->type-1]) {            /* force frame size */                  data->quant = 31;
                             s->scaled_length = min_size[s->type-1];  
                             target -= s->scaled_length;  
                             pass1_length -= s->length;  
683                      }else{                      }else{
684                              s->scaled_length = 0;  
685                      }                  /* The frame quantizer has not been clipped, this appears to be a good
686                     * computed quantizer, do not loose quantizer decimal part that we
687                     * accumulate for later reuse when its sum represents a complete
688                     * unit. */
689                    rc->quant_error[s->type-1][data->quant] += scaled_quant - (double)data->quant;
690    
691                    if (rc->quant_error[s->type-1][data->quant] >= 1.0) {
692                            rc->quant_error[s->type-1][data->quant] -= 1.0;
693                            data->quant++;
694                    } else 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--;
697          }          }
698          }          }
699    
700      scaler = (double)target / (double)pass1_length;          /* Now we have a computed quant that is in the right quante range, with a
701      if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {           * possible +1 correction due to cumulated error. We can now safely clip
702                  DPRINTF(XVID_DEBUG_RC,"undersize warning\n");           * the quantizer again with user's quant ranges. "Safely" means the Rate
703                  scaler = 1.0;           * Control could learn more about this quantizer, this knowledge is useful
704             * for future frames even if it this quantizer won't be really used atm,
705             * that's why we don't perform this clipping earlier. */
706            if (data->quant < data->min_quant[s->type-1]) {
707                    data->quant = data->min_quant[s->type-1];
708            } else if (data->quant > data->max_quant[s->type-1]) {
709                    data->quant = data->max_quant[s->type-1];
710          }          }
711    
712          DPRINTF(XVID_DEBUG_RC, "target=%i, tot_length=%i, scaler=%f\n", (int)target, (int)pass1_length, scaler);          /* To avoid big quality jumps from frame to frame, we apply a "security"
713             * rule that makes |last_quant - new_quant| <= 2. This rule only applies
714          for (i=0; i<rc->num_frames; i++) {           * to predicted frames (P and B) */
715                  stat_t * s = &rc->stats[i];          if (s->type != XVID_TYPE_IVOP && rc->last_quant[s->type-1] && capped_to_max_framesize == 0) {
716    
717                  if (s->scaled_length==0) {      /* ignore frame with forced frame sizes */                  if (data->quant > rc->last_quant[s->type-1] + 2) {
718                          s->scaled_length = (int)((double)s->length * scaler * s->weight / rc->avg_weight);                          data->quant = rc->last_quant[s->type-1] + 2;
719                            DPRINTF(XVID_DEBUG_RC,
720                                            "[xvid rc] -- frame %d p/b-frame quantizer prevented from rising too steeply\n",
721                                            data->frame_num);
722                  }                  }
723                    if (data->quant < rc->last_quant[s->type-1] - 2) {
724                            data->quant = rc->last_quant[s->type-1] - 2;
725                            DPRINTF(XVID_DEBUG_RC,
726                                            "[xvid rc] -- frame:%d p/b-frame quantizer prevented from falling too steeply\n",
727                                            data->frame_num);
728          }          }
729  }  }
730    
731            /* We don't want to pollute the RC histerisis when our computed quant has
732             * been computed from a capped frame size */
733            if (capped_to_max_framesize == 0)
734                    rc->last_quant[s->type-1] = data->quant;
735    
736            /* Don't forget to force 1st pass frame type ;-) */
737            data->type = s->type;
738    
739            return 0;
740    }
741    
742    /*----------------------------------------------------------------------------
743     *--------------------------------------------------------------------------*/
744    
745  void pre_process1(rc_2pass2_t * rc)  static int
746    rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)
747  {  {
748      int i;          const char frame_type[4] = { 'i', 'p', 'b', 's'};
749      double total1, total2;          twopass_stat_t * s = &rc->stats[data->frame_num];
     uint64_t ivop_boost_total;  
   
     ivop_boost_total = 0;  
     rc->curve_comp_error = 0;  
750    
751      for (i=0; i<3; i++) {          /* Insufficent stats data */
752          rc->tot_scaled_length[i] = 0;          if (data->frame_num >= rc->num_frames)
753      }                  return 0;
754    
755      for (i=0; i<rc->num_frames; i++) {          /* Update the quantizer counter */
756          stat_t * s = &rc->stats[i];          rc->quant_count[s->type-1][data->quant]++;
757    
758          rc->tot_scaled_length[s->type-1] += s->scaled_length;          /* Update the frame type overflow */
759            if (data->type == XVID_TYPE_IVOP) {
760                    int kfdiff = 0;
761    
762          if (s->type == XVID_TYPE_IVOP) {                  if(rc->KF_idx != rc->num_frames -1) {
763              ivop_boost_total += s->scaled_length * rc->param.keyframe_boost / 100;                          kfdiff  = rc->keyframe_locations[rc->KF_idx+1];
764          }                          kfdiff -= rc->keyframe_locations[rc->KF_idx];
765      }      }
766    
767      rc->movie_curve = ((double)(rc->tot_scaled_length[XVID_TYPE_PVOP-1] + rc->tot_scaled_length[XVID_TYPE_BVOP-1] + ivop_boost_total) /                  /* Flush Keyframe overflow accumulator */
768                                          (rc->tot_scaled_length[XVID_TYPE_PVOP-1] + rc->tot_scaled_length[XVID_TYPE_BVOP-1]));                  rc->overflow += rc->KFoverflow;
769    
770      for(i=0; i<3; i++) {                  /* Store the frame overflow to the keyframe accumulator */
771          if (rc->count[i] == 0 || rc->movie_curve == 0) {                  rc->KFoverflow = s->desired_length - data->length;
772              rc->avg_length[i] = 1;  
773                    if (kfdiff > 1) {
774                            /* Non-consecutive keyframes case:
775                             * We can then divide this total keyframe overflow into equal parts
776                             * that we will distribute into regular overflow at each frame
777                             * between the sequence bounded by two IFrames */
778                            rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);
779          }else{          }else{
780              rc->avg_length[i] = rc->tot_scaled_length[i] / rc->count[i] / rc->movie_curve;                          /* Consecutive keyframes case:
781          }                           * Flush immediatly the keyframe overflow and reset keyframe
782                             * overflow */
783                            rc->overflow += rc->KFoverflow;
784                            rc->KFoverflow = 0;
785                            rc->KFoverflow_partial = 0;
786      }      }
787                    rc->KF_idx++;
788            } else {
789                    /* Accumulate the frame overflow */
790                    rc->overflow += s->desired_length - data->length;
791    
792      /* alt curve stuff here */                  /* Distribute part of the keyframe overflow */
793                    rc->overflow += rc->KFoverflow_partial;
794    
795      if (rc->param.use_alt_curve) {                  /* Don't forget to substract that same amount from the total keyframe
796          const double avg_pvop = rc->avg_length[XVID_TYPE_PVOP-1];                   * overflow */
797          const uint64_t tot_pvop = rc->tot_length[XVID_TYPE_PVOP-1];                  rc->KFoverflow -= rc->KFoverflow_partial;
798          const uint64_t tot_bvop = rc->tot_length[XVID_TYPE_BVOP-1];          }
         const uint64_t tot_scaled_pvop = rc->tot_scaled_length[XVID_TYPE_PVOP-1];  
         const uint64_t tot_scaled_bvop = rc->tot_scaled_length[XVID_TYPE_BVOP-1];  
799    
800                  rc->alt_curve_low = avg_pvop - avg_pvop * (double)rc->param.alt_curve_low_dist / 100.0;          rc->overflow += (s->error = s->desired_length - data->length);
801                  rc->alt_curve_low_diff = avg_pvop - rc->alt_curve_low;          rc->real_total += data->length;
                 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;  
802    
803          if (rc->param.alt_curve_use_auto) {          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",
804              if (tot_bvop + tot_pvop > tot_scaled_bvop + tot_scaled_pvop) {                          data->frame_num,
805                                  rc->param.alt_curve_min_rel_qual = (int)(100.0 - (100.0 - 100.0 /                          frame_type[data->type-1],
806                                          ((double)(tot_pvop + tot_bvop) / (double)(tot_scaled_pvop + tot_scaled_bvop))) * (double)rc->param.alt_curve_auto_str / 100.0);                          data->quant,
807                            s->length,
808                            s->scaled_length,
809                            s->desired_length,
810                            s->desired_length - s->error,
811                            -s->error,
812                            rc->overflow);
813    
814                                  if (rc->param.alt_curve_min_rel_qual < 20)          return(0);
                                         rc->param.alt_curve_min_rel_qual = 20;  
             }else{  
                                 rc->param.alt_curve_min_rel_qual = 100;  
             }  
815          }          }
                 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;  
816    
817          if (rc->param.alt_curve_low_dist > 100) {  /*****************************************************************************
818                          switch(rc->param.alt_curve_type) {   * Helper functions definition
819              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)));  
                         }  
                 }  
     }  
     /* --- */  
820    
821    /* Default buffer size for reading lines */
822    #define BUF_SZ   1024
823    
824      total1=total2=0;  /* Helper functions for reading/parsing the stats file */
825      for (i=0; i<rc->num_frames; i++) {  static char *skipspaces(char *string);
826          stat_t * s = &rc->stats[i];  static int iscomment(char *string);
827    static char *readline(FILE *f);
828    
829    /* This function counts the number of frame entries in the stats file
830     * It also counts the number of I Frames */
831    static int
832    statsfile_count_frames(rc_2pass2_t * rc, char * filename)
833    {
834            FILE * f;
835            char *line;
836            int lines;
837    
838          if (s->type != XVID_TYPE_IVOP) {          rc->num_frames = 0;
839              double dbytes,dbytes2;          rc->num_keyframes = 0;
840    
841              dbytes = s->scaled_length / rc->movie_curve;          if ((f = fopen(filename, "rb")) == NULL)
842              dbytes2 = 0; /* XXX: warning */                  return(-1);
             total1 += dbytes;  
             if (s->type == XVID_TYPE_BVOP)  
                 dbytes *= rc->avg_length[XVID_TYPE_PVOP-1] / rc->avg_length[XVID_TYPE_BVOP-1];  
843    
844              if (rc->param.use_alt_curve) {          lines = 0;
845                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {          while ((line = readline(f)) != NULL) {
846    
847                      if (dbytes >= rc->alt_curve_high) {                  char *ptr;
848                                                  dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev);                  char type;
849                      }else{                  int fields;
                                                 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_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))));  
                                                 }  
                                         }  
850    
851                  }                  lines++;
852    
853                    /* We skip spaces */
854                    ptr = skipspaces(line);
855    
856              }else{                  /* Skip coment lines or empty lines */
857                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                  if(iscomment(ptr) || *ptr == '\0') {
858                      dbytes2=((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_high / 100.0);                          free(line);
859                  }else{                          continue;
                                 dbytes2 = ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_low / 100.0);  
                 }  
860              }              }
861    
862              if (s->type == XVID_TYPE_BVOP) {                  /* Read the stat line from buffer */
863                              dbytes2 *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];                  fields = sscanf(ptr, "%c", &type);
864                              if (dbytes2 < rc->min_length[XVID_TYPE_BVOP-1])  
865                                      dbytes2 = rc->min_length[XVID_TYPE_BVOP-1];                  /* Valid stats files have at least 7 fields */
866              }else{                  if (fields == 1) {
867                              if (dbytes2 < rc->min_length[XVID_TYPE_PVOP-1])                          switch(type) {
868                                      dbytes2 = rc->min_length[XVID_TYPE_PVOP-1];                          case 'i':
869                            case 'I':
870                                    rc->num_keyframes++;
871                            case 'p':
872                            case 'P':
873                            case 'b':
874                            case 'B':
875                            case 's':
876                            case 'S':
877                                    rc->num_frames++;
878                                    break;
879                            default:
880                                    DPRINTF(XVID_DEBUG_RC,
881                                                    "[xvid rc] -- WARNING: L%d unknown frame type used (%c).\n",
882                                                    lines, type);
883              }              }
884              total2 += dbytes2;                  } else {
885                                    DPRINTF(XVID_DEBUG_RC,
886                                                    "[xvid rc] -- WARNING: L%d misses some stat fields (%d).\n",
887                                                    lines, 7-fields);
888          }          }
889    
890                    /* Free the line buffer */
891                    free(line);
892      }      }
893    
894      rc->curve_comp_scale = total1 / total2;          /* We are done with the file */
895            fclose(f);
896    
897      if (!rc->param.use_alt_curve) {          return(0);
         DPRINTF(XVID_DEBUG_RC, "middle frame size for asymmetric curve compression: %i\n",  
             (int)(rc->avg_length[XVID_TYPE_PVOP-1] * rc->curve_comp_scale));  
898      }      }
899    
900      if (rc->param.use_alt_curve) {  /* open stats file(s) and read into rc->stats array */
901          int bonus_bias = rc->param.alt_curve_bonus_bias;  static int
902          int oldquant = 1;  statsfile_load(rc_2pass2_t *rc, char * filename)
903    {
904            FILE * f;
905            int processed_entries;
906    
907              if (rc->param.alt_curve_use_auto_bonus_bias)          /* Opens the file */
908                      bonus_bias = rc->param.alt_curve_min_rel_qual;          if ((f = fopen(filename, "rb"))==NULL)
909                    return(-1);
910    
911              rc->alt_curve_curve_bias_bonus = (total1 - total2) * (double)bonus_bias / 100.0 / (double)(rc->num_frames /* - credits_frames */ - rc->num_keyframes);          processed_entries = 0;
912              rc->curve_comp_scale = ((total1 - total2) * (1.0 - (double)bonus_bias / 100.0) + total2) / total2;          while(processed_entries < rc->num_frames) {
913                    char type;
914                    int fields;
915                    twopass_stat_t * s = &rc->stats[processed_entries];
916                    char *line, *ptr;
917    
918                    /* Read the line from the file */
919                    if((line = readline(f)) == NULL)
920                            break;
921    
922          /* special info for alt curve:  bias bonus and quantizer thresholds */                  /* We skip spaces */
923                    ptr = skipspaces(line);
924    
925                  DPRINTF(XVID_DEBUG_RC, "avg scaled framesize:%i", (int)rc->avg_length[XVID_TYPE_PVOP-1]);                  /* Skip comment lines or empty lines */
926                  DPRINTF(XVID_DEBUG_RC, "bias bonus:%i bytes", (int)rc->alt_curve_curve_bias_bonus);                  if(iscomment(ptr) || *ptr == '\0') {
927                            free(line);
928                            continue;
929                    }
930    
931                  for (i=1; i <= (int)(rc->alt_curve_high*2)+1; i++) {                  /* Reset this field that is optional */
932              double curve_temp, dbytes;                  s->scaled_length = 0;
             int newquant;  
933    
934              dbytes = i;                  /* Convert the fields */
935                          if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                  fields = sscanf(ptr,
936                  if (dbytes >= rc->alt_curve_high) {                                                  "%c %d %d %d %d %d %d %d\n",
937                                          curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev);                                                  &type,
938                  }else{                                                  &s->quant,
939                                          switch(rc->param.alt_curve_type)                                                  &s->blks[0], &s->blks[1], &s->blks[2],
940                                          {                                                  &s->length, &s->invariant /* not really yet */,
941                                          case XVID_CURVE_SINE :                                                  &s->scaled_length);
942                                                  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)));  
943                                                  break;                  /* Free line buffer, we don't need it anymore */
944                                          case XVID_CURVE_LINEAR :                  free(line);
945                                                  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);  
946                    /* Fail silently, this has probably been warned in
947                     * statsfile_count_frames */
948                    if(fields != 7 && fields != 8)
949                            continue;
950    
951                    /* Convert frame type and compute the invariant length part */
952                    switch(type) {
953                    case 'i':
954                    case 'I':
955                            s->type = XVID_TYPE_IVOP;
956                            s->invariant /= INVARIANT_HEADER_PART_IVOP;
957                                                  break;                                                  break;
958                                          case XVID_CURVE_COSINE :                  case 'p':
959                                                  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))));                  case 'P':
960                                          }                  case 's':
961                                  }                  case 'S':
962                          }else{                          s->type = XVID_TYPE_PVOP;
963                  if (dbytes <= rc->alt_curve_low) {                          s->invariant /= INVARIANT_HEADER_PART_PVOP;
                                         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)));  
964                                                  break;                                                  break;
965                                          case XVID_CURVE_LINEAR :                  case 'b':
966                                                  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);                  case 'B':
967                            s->type = XVID_TYPE_BVOP;
968                            s->invariant /= INVARIANT_HEADER_PART_BVOP;
969                                                  break;                                                  break;
970                                          case XVID_CURVE_COSINE :                  default:
971                                                  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))));                          /* Same as before, fail silently */
972                            continue;
973                                          }                                          }
                                 }  
                         }  
   
                         if (rc->movie_curve > 1.0)  
                                 dbytes *= rc->movie_curve;  
974    
975                          newquant = (int)(dbytes * 2.0 / (curve_temp * rc->curve_comp_scale + rc->alt_curve_curve_bias_bonus));                  /* Ok it seems it's been processed correctly */
976                          if (newquant > 1) {                  processed_entries++;
                                 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", newquant, i, percent);  
                                 }  
                         }  
977                  }                  }
978    
979      }          /* Close the file */
980            fclose(f);
981    
982      rc->overflow = 0;          return(0);
     rc->KFoverflow = 0;  
     rc->KFoverflow_partial = 0;  
     rc->KF_idx = 1;  
983  }  }
984    
985    /* pre-process the statistics data
986     * - for each type, count, tot_length, min_length, max_length
987     * - set keyframes_locations */
988  static int rc_2pass2_create(xvid_plg_create_t * create, rc_2pass2_t ** handle)  static void
989    first_pass_stats_prepare_data(rc_2pass2_t * rc)
990  {  {
991      xvid_plugin_2pass2_t * param = (xvid_plugin_2pass2_t *)create->param;          int i,j;
     rc_2pass2_t * rc;  
     int i;  
992    
993      rc = malloc(sizeof(rc_2pass2_t));          /* *rc fields initialization
994      if (rc == NULL)           * NB: INT_MAX and INT_MIN are used in order to be immediately replaced
995          return XVID_ERR_MEMORY;           *     with real values of the 1pass */
996            for (i=0; i<3; i++) {
997                    rc->count[i]=0;
998                    rc->tot_length[i] = 0;
999                    rc->tot_invariant[i] = 0;
1000                    rc->min_length[i] = INT_MAX;
1001            }
1002    
1003      rc->param = *param;          rc->max_length = INT_MIN;
1004    
1005      if (rc->param.keyframe_boost <= 0) rc->param.keyframe_boost = 0;          /* Loop through all frames and find/compute all the stuff this function
1006      if (rc->param.payback_method <= 0) rc->param.payback_method = XVID_PAYBACK_PROP;           * is supposed to do */
1007      if (rc->param.bitrate_payback_delay <= 0) rc->param.bitrate_payback_delay = 250;          for (i=j=0; i<rc->num_frames; i++) {
1008      if (rc->param.curve_compression_high <= 0) rc->param.curve_compression_high = 0;                  twopass_stat_t * s = &rc->stats[i];
     if (rc->param.curve_compression_low <= 0) rc->param.curve_compression_low = 0;  
     if (rc->param.max_overflow_improvement <= 0) rc->param.max_overflow_improvement = 60;  
     if (rc->param.max_overflow_degradation <= 0) rc->param.max_overflow_degradation = 60;  
   
     if (rc->param.use_alt_curve <= 0) rc->param.use_alt_curve = 0;  
     if (rc->param.alt_curve_high_dist <= 0) rc->param.alt_curve_high_dist = 500;  
     if (rc->param.alt_curve_low_dist <= 0) rc->param.alt_curve_low_dist = 90;  
     if (rc->param.alt_curve_use_auto <= 0) rc->param.alt_curve_use_auto = 1;  
     if (rc->param.alt_curve_auto_str <= 0) rc->param.alt_curve_auto_str = 30;  
     if (rc->param.alt_curve_type <= 0) rc->param.alt_curve_type = XVID_CURVE_LINEAR;  
     if (rc->param.alt_curve_min_rel_qual <= 0) rc->param.alt_curve_min_rel_qual = 50;  
     if (rc->param.alt_curve_use_auto_bonus_bias <= 0) rc->param.alt_curve_use_auto_bonus_bias = 1;  
     if (rc->param.alt_curve_bonus_bias <= 0) rc->param.alt_curve_bonus_bias = 50;  
   
     if (rc->param.kftreshold <= 0) rc->param.kftreshold = 10;  
     if (rc->param.kfreduction <= 0) rc->param.kfreduction = 20;  
     if (rc->param.min_key_interval <= 0) rc->param.min_key_interval = 300;  
1009    
1010      if (!det_stats_length(rc, param->filename)){                  rc->count[s->type-1]++;
1011          DPRINTF(XVID_DEBUG_RC,"fopen %s failed\n", param->filename);                  rc->tot_length[s->type-1] += s->length;
1012          free(rc);                  rc->tot_invariant[s->type-1] += s->invariant;
         return XVID_ERR_FAIL;  
     }  
1013    
1014      if ((rc->stats = malloc(rc->num_frames * sizeof(stat_t))) == NULL) {                  if (s->length < rc->min_length[s->type-1]) {
1015          free(rc);                          rc->min_length[s->type-1] = s->length;
         return XVID_ERR_MEMORY;  
1016      }      }
1017    
1018      /*                  if (s->length > rc->max_length) {
1019           * We need an extra location because we do as if the last frame were an                          rc->max_length = s->length;
          * IFrame. This is needed because our code consider that frames between  
          * 2 IFrames form a natural sequence. So we store last frame as a  
          * keyframe location.  
          */  
     if ((rc->keyframe_locations = malloc((rc->num_keyframes + 1) * sizeof(int))) == NULL) {  
         free(rc->stats);  
         free(rc);  
         return XVID_ERR_MEMORY;  
1020      }      }
1021    
1022      if (!load_stats(rc, param->filename)) {                  if (s->type == XVID_TYPE_IVOP) {
1023          DPRINTF(XVID_DEBUG_RC,"fopen %s failed\n", param->filename);                          rc->keyframe_locations[j] = i;
1024          free(rc->keyframe_locations);                          j++;
         free(rc->stats);  
         free(rc);  
         return XVID_ERR_FAIL;  
1025      }      }
   
     /* pre-process our stats */  
   
         if (rc->num_frames  < create->fbase/create->fincr) {  
                 rc->target = rc->param.bitrate / 8;     /* one second */  
         }else{  
                 rc->target = (rc->param.bitrate * rc->num_frames * create->fincr) / (create->fbase * 8);  
1026          }          }
1027    
1028      DPRINTF(XVID_DEBUG_RC, "rc->target : %i\n", rc->target);          /* NB:
1029             * The "per sequence" overflow system considers a natural sequence to be
1030             * formed by all frames between two iframes, so if we want to make sure
1031             * the system does not go nuts during last sequence, we force the last
1032             * frame to appear in the keyframe locations array. */
1033            rc->keyframe_locations[j] = i;
1034    
1035  #if 0          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Min 1st pass IFrame length: %d\n", rc->min_length[0]);
1036          rc->target -= rc->num_frames*24;        /* avi file header */          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Min 1st pass PFrame length: %d\n", rc->min_length[1]);
1037  #endif          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Min 1st pass BFrame length: %d\n", rc->min_length[2]);
1038    }
1039    
1040    /* calculate zone weight "center" */
1041    static void
1042    zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)
1043    {
1044            int i,j;
1045            int n = 0;
1046    
1047          pre_process0(rc);          rc->avg_weight = 0.0;
1048            rc->tot_quant = 0;
1049            rc->tot_quant_invariant = 0;
1050    
1051          if (rc->param.bitrate) {          if (create->num_zones == 0) {
1052          zone_process(rc, create);                  for (j = 0; j < rc->num_frames; j++) {
1053                  internal_scale(rc);                          rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1054      }else{                          rc->stats[j].weight = 1.0;
         /* external scaler: ignore zone */  
         for (i=0;i<rc->num_frames;i++) {  
             rc->stats[i].zone_mode = XVID_ZONE_WEIGHT;  
             rc->stats[i].weight = 1.0;  
1055          }          }
1056          rc->avg_weight = 1.0;                  rc->avg_weight += rc->num_frames * 1.0;
1057          rc->tot_quant = 0;                  n += rc->num_frames;
1058      }      }
         pre_process1(rc);  
1059    
     for (i=0; i<32;i++) {  
         rc->pquant_error[i] = 0;  
         rc->bquant_error[i] = 0;  
         rc->quant_count[i] = 0;  
     }  
1060    
1061      rc->fq_error = 0;          for(i=0; i < create->num_zones; i++) {
1062    
1063      *handle = rc;                  int next = (i+1<create->num_zones) ? create->zones[i+1].frame : rc->num_frames;
         return(0);  
 }  
1064    
1065                    if (i==0 && create->zones[i].frame > 0) {
1066                            for (j = 0; j < create->zones[i].frame && j < rc->num_frames; j++) {
1067                                    rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1068                                    rc->stats[j].weight = 1.0;
1069                            }
1070                            rc->avg_weight += create->zones[i].frame * 1.0;
1071                            n += create->zones[i].frame;
1072                    }
1073    
1074  static int rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy)                  if (create->zones[i].mode == XVID_ZONE_WEIGHT) {
1075  {                          for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {
1076      free(rc->keyframe_locations);                                  rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1077      free(rc->stats);                                  rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;
1078          free(rc);                          }
1079          return(0);                          next -= create->zones[i].frame;
1080                            rc->avg_weight += (double)(next * create->zones[i].increment) / (double)create->zones[i].base;
1081                            n += next;
1082                    } else{  /* XVID_ZONE_QUANT */
1083                            for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {
1084                                    rc->stats[j].zone_mode = XVID_ZONE_QUANT;
1085                                    rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;
1086                                    rc->tot_quant += rc->stats[j].length;
1087                                    rc->tot_quant_invariant += rc->stats[j].invariant;
1088                            }
1089                    }
1090  }  }
1091            rc->avg_weight = n>0 ? rc->avg_weight/n : 1.0;
1092    
1093            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- center_weight:%f (for %d frames)  fixed_bytes:%d\n", rc->avg_weight, n, rc->tot_quant);
1094    }
1095    
1096    
1097  static int rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)  /* scale the curve */
1098    static void
1099    first_pass_scale_curve_internal(rc_2pass2_t *rc)
1100  {  {
1101      stat_t * s = &rc->stats[data->frame_num];          int64_t target;
1102      int overflow;          int64_t pass1_length;
1103      int desired;          int64_t total_invariant;
1104      double dbytes;          double scaler;
1105      double curve_temp;          int i, num_MBs;
     int capped_to_max_framesize = 0;  
   
         /*  
          * 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.  
          */  
   
         /* First case: Another plugin has already set a quantizer */  
     if (data->quant > 0)  
                 return(0);  
1106    
1107          /* Second case: We are in a Quant zone */          /* We only scale texture data ! */
1108          if (s->zone_mode == XVID_ZONE_QUANT) {          total_invariant  = rc->tot_invariant[XVID_TYPE_IVOP-1];
1109            total_invariant += rc->tot_invariant[XVID_TYPE_PVOP-1];
1110            total_invariant += rc->tot_invariant[XVID_TYPE_BVOP-1];
1111            /* don't forget to substract header bytes used in quant zones, otherwise we
1112             * counting them twice */
1113            total_invariant -= rc->tot_quant_invariant;
1114    
1115            /* We remove the bytes used by the fixed quantizer zones during first pass
1116             * with the same quants, so we know very precisely how much that
1117             * represents */
1118            target  = rc->target;
1119            target -= rc->tot_quant;
1120    
1121            /* Do the same for the first pass data */
1122            pass1_length  = rc->tot_length[XVID_TYPE_IVOP-1];
1123            pass1_length += rc->tot_length[XVID_TYPE_PVOP-1];
1124            pass1_length += rc->tot_length[XVID_TYPE_BVOP-1];
1125            pass1_length -= rc->tot_quant;
1126    
1127            /* Let's compute a linear scaler in order to perform curve scaling */
1128            scaler = (double)(target - total_invariant) / (double)(pass1_length - total_invariant);
1129    
1130    #ifdef PASS_SMALLER
1131            if ((target - total_invariant) <= 0 ||
1132                    (pass1_length - total_invariant) <= 0 ||
1133                    target >= pass1_length) {
1134                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- WARNING: Undersize detected before correction\n");
1135                    scaler = 1.0;
1136            }
1137    #endif
1138    
1139                  rc->fq_error += s->weight;          /* Compute min frame lengths (for each frame type) according to the number
1140                  data->quant = (int)rc->fq_error;           * of MBs. We sum all block type counters of frame 0, this gives us the
1141                  rc->fq_error -= data->quant;           * number of MBs.
1142             *
1143             * We compare these hardcoded values with observed values in first pass
1144             * (determined in pre_process0).Then we keep the real minimum. */
1145    
1146                  s->desired_length = s->length;          /* Number of MBs */
1147            num_MBs  = rc->stats[0].blks[0];
1148            num_MBs += rc->stats[0].blks[1];
1149            num_MBs += rc->stats[0].blks[2];
1150    
1151            /* Minimum for I frames */
1152            if(rc->min_length[XVID_TYPE_IVOP-1] > ((num_MBs*22) + 240) / 8)
1153                    rc->min_length[XVID_TYPE_IVOP-1] = ((num_MBs*22) + 240) / 8;
1154    
1155            /* Minimum for P/S frames */
1156            if(rc->min_length[XVID_TYPE_PVOP-1] > ((num_MBs) + 88)  / 8)
1157                    rc->min_length[XVID_TYPE_PVOP-1] = ((num_MBs) + 88)  / 8;
1158    
1159            /* Minimum for B frames */
1160            if(rc->min_length[XVID_TYPE_BVOP-1] > 8)
1161                    rc->min_length[XVID_TYPE_BVOP-1] = 8;
1162    
1163                  return(0);          /* Perform an initial scale pass.
1164             *
1165             * If a frame size is scaled underneath our hardcoded minimums, then we
1166             * force the frame size to the minimum, and deduct the original & scaled
1167             * frame length from the original and target total lengths */
1168            for (i=0; i<rc->num_frames; i++) {
1169                    twopass_stat_t * s = &rc->stats[i];
1170                    int len;
1171    
1172                    /* No need to scale frame length for which a specific quantizer is
1173                     * specified thanks to zones */
1174                    if (s->zone_mode == XVID_ZONE_QUANT) {
1175                            s->scaled_length = s->length;
1176                            continue;
1177          }          }
1178    
1179          /* Third case: insufficent stats data */                  /* Compute the scaled length -- only non invariant data length is scaled */
1180          if (data->frame_num >= rc->num_frames)                  len = s->invariant + (int)((double)(s->length-s->invariant) * scaler * s->weight / rc->avg_weight);
                 return 0;  
   
         /*  
          * The last case is the one every normal minded developer should fear to  
          * maintain in a project :-)  
          */  
1181    
1182          /* XXX: why by 8 */                  /* Compare with the computed minimum */
1183          overflow = rc->overflow / 8;                  if (len < rc->min_length[s->type-1]) {
1184                            /* This is a 'forced size' frame, set its frame size to the
1185                             * computed minimum */
1186                            s->scaled_length = rc->min_length[s->type-1];
1187    
1188          /*                          /* Remove both scaled and original size from their respective
1189           * The rc->overflow field represents the overflow in current scene (between two                           * total counters, as we prepare a second pass for 'regular'
1190           * IFrames) so we must not forget to reset it if we are enetring a new scene                           * frames */
1191           */                          target -= s->scaled_length;
1192          if (s->type == XVID_TYPE_IVOP) {                          pass1_length -= s->length;
1193                  overflow = 0;                  } else {
1194                            /* Do nothing for now, we'll scale this later */
1195                            s->scaled_length = 0;
1196                    }
1197          }          }
1198    
1199          desired = s->scaled_length;          /* The first pass on data substracted all 'forced size' frames from the
1200             * total counters. Now, it's possible to scale the 'regular' frames. */
1201    
1202          dbytes = desired;          /* Scaling factor for 'regular' frames */
1203          if (s->type == XVID_TYPE_IVOP) {          scaler = (double)(target - total_invariant) / (double)(pass1_length - total_invariant);
                 dbytes += desired * rc->param.keyframe_boost / 100;  
         }  
         dbytes /= rc->movie_curve;  
1204    
1205          /*  #ifdef PASS_SMALLER
1206           * We are now entering in the hard part of the algo, it was first designed          /* Detect undersizing */
1207           * to work with i/pframes only streams, so the way it computes things is          if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {
1208           * adapted to pframes only. However we can use it if we just take care to                  DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- WARNING: Undersize detected after correction\n");
1209           * scale the bframes sizes to pframes sizes using the ratio avg_p/avg_p and                  scaler = 1.0;
          * 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];  
1210          }          }
1211    #endif
1212    
1213          /*          /* Do another pass with the new scaler */
1214           * Apply user's choosen Payback method. Payback helps bitrate to follow the          for (i=0; i<rc->num_frames; i++) {
1215           * scaled curve "paying back" past errors in curve previsions.                  twopass_stat_t * s = &rc->stats[i];
          */  
         if (rc->param.payback_method == XVID_PAYBACK_BIAS) {  
                 desired =(int)(rc->curve_comp_error / rc->param.bitrate_payback_delay);  
         }else{  
                 desired = (int)(rc->curve_comp_error * dbytes /  
                                                 rc->avg_length[XVID_TYPE_PVOP-1] / rc->param.bitrate_payback_delay);  
1216    
1217                  if (labs(desired) > fabs(rc->curve_comp_error)) {                  /* Ignore frame with forced frame sizes */
1218                          desired = (int)rc->curve_comp_error;                  if (s->scaled_length == 0)
1219                  }                          s->scaled_length = s->invariant + (int)((double)(s->length-s->invariant) * scaler * s->weight / rc->avg_weight);
1220          }          }
1221    
1222          rc->curve_comp_error -= desired;          /* Job done */
1223            return;
1224    }
1225    
1226          /*  /* Apply all user settings to the scaled curve
1227           * Alt curve treatment is not that hard to understand though the formulas   * This implies:
1228           * seem to be huge. Alt treatment is basically a way to soft/harden the   *   keyframe boosting
1229           * curve flux applying sine/linear/cosine ratios   *   high/low compression */
1230           */  static void
1231    scaled_curve_apply_advanced_parameters(rc_2pass2_t * rc)
1232    {
1233            int i;
1234            int64_t ivop_boost_total;
1235    
1236          /* XXX: warning */          /* Reset the rate controller (per frame type) total byte counters */
1237          curve_temp = 0;          for (i=0; i<3; i++) rc->tot_scaled_length[i] = 0;
1238    
1239          if (rc->param.use_alt_curve) {          /* Compute total bytes for each frame type */
1240                  if (s->type != XVID_TYPE_IVOP)  {          for (i=0; i<rc->num_frames;i++) {
1241                          if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                  twopass_stat_t *s = &rc->stats[i];
1242                                  if (dbytes >= rc->alt_curve_high) {                  rc->tot_scaled_length[s->type-1] += s->scaled_length;
                                         curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev);  
                                 } 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_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))));  
                                         }  
                                 }  
1243                          }                          }
1244    
1245                          /*          /* First we compute the total amount of bits needed, as being described by
1246                           * End of code path for curve_temp, as told earlier, we are now           * the scaled distribution. During this pass over the complete stats data,
1247                           * obliged to scale the value to a bframe one using the inverse           * we see how much bits two user settings will get/give from/to p&b frames:
1248                           * ratio applied earlier           *  - keyframe boosting
1249                           */           *  - keyframe distance penalty */
1250                          if (s->type == XVID_TYPE_BVOP)          rc->KF_idx = 0;
1251                                  curve_temp *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];          ivop_boost_total = 0;
1252            for (i=0; i<rc->num_frames; i++) {
1253                    twopass_stat_t * s = &rc->stats[i];
1254    
1255                          curve_temp = curve_temp * rc->curve_comp_scale + rc->alt_curve_curve_bias_bonus;                  /* Some more work is needed for I frames */
1256                    if (s->type == XVID_TYPE_IVOP) {
1257                            int ivop_boost;
1258    
1259                          desired += ((int)curve_temp);                          /* Accumulate bytes needed for keyframe boosting */
1260                          rc->curve_comp_error += curve_temp - (int)curve_temp;                          ivop_boost = s->scaled_length*rc->param.keyframe_boost/100;
                 } 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];  
1261    
1262                          desired += ((int)dbytes);  #if 0 /* ToDo: decide how to apply kfthresholding */
1263                          rc->curve_comp_error += dbytes - (int)dbytes;  #endif
1264                  }                          /* If the frame size drops under the minimum length, then cap ivop_boost */
1265                            if (ivop_boost + s->scaled_length < rc->min_length[XVID_TYPE_IVOP-1])
1266                                    ivop_boost = rc->min_length[XVID_TYPE_IVOP-1] - s->scaled_length;
1267    
1268          } else if ((rc->param.curve_compression_high + rc->param.curve_compression_low) &&      s->type != XVID_TYPE_IVOP) {                          /* Accumulate the ivop boost */
1269                            ivop_boost_total += ivop_boost;
1270    
1271                  curve_temp = rc->curve_comp_scale;                          /* Don't forget to update the keyframe index */
1272                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                          rc->KF_idx++;
1273                          curve_temp *= ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_high / 100.0);                  }
                 } else {  
                         curve_temp *= ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_low / 100.0);  
1274                  }                  }
1275    
1276                  /*          /* Initialize the IBoost tax ratio for P/S/B frames
1277                   * End of code path for curve_temp, as told earlier, we are now           *
1278                   * obliged to scale the value to a bframe one using the inverse           * This ratio has to be applied to p/b/s frames in order to reserve
1279                   * ratio applied earlier           * additional bits for keyframes (keyframe boosting) or if too much
1280                   */           * keyframe distance is applied, bits retrieved from the keyframes.
1281                  if (s->type == XVID_TYPE_BVOP)           *
1282                          curve_temp *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];           * ie pb_length *= rc->pb_iboost_tax_ratio;
1283             *
1284             *    gives the ideal length of a p/b frame */
1285    
1286                  desired += (int)curve_temp;          /* Compute the total length of p/b/s frames (temporary storage into
1287                  rc->curve_comp_error += curve_temp - (int)curve_temp;           * movie_curve) */
1288          } else {          rc->pb_iboost_tax_ratio  = (double)rc->tot_scaled_length[XVID_TYPE_PVOP-1];
1289                  /*          rc->pb_iboost_tax_ratio += (double)rc->tot_scaled_length[XVID_TYPE_BVOP-1];
1290                   * End of code path for dbytes, as told earlier, we are now  
1291                   * obliged to scale the value to a bframe one using the inverse          /* Compute the ratio described above
1292                   * ratio applied earlier           *     taxed_total = sum(0, n, tax*scaled_length)
1293                   */           * <=> taxed_total = tax.sum(0, n, scaled_length)
1294                  if (s->type == XVID_TYPE_BVOP){           * <=> tax = taxed_total / original_total */
1295                          dbytes *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];          rc->pb_iboost_tax_ratio =
1296                  }                  (rc->pb_iboost_tax_ratio - ivop_boost_total) /
1297                    rc->pb_iboost_tax_ratio;
1298    
1299                  desired += (int)dbytes;          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- IFrame boost tax ratio:%.2f\n",
1300                  rc->curve_comp_error += dbytes - (int)dbytes;                          rc->pb_iboost_tax_ratio);
         }  
1301    
1302            /* Compute the average size of frames per frame type */
1303            for(i=0; i<3; i++) {
1304                    /* Special case for missing type or weird case */
1305                    if (rc->count[i] == 0 || rc->pb_iboost_tax_ratio == 0) {
1306                            rc->avg_length[i] = 1;
1307                    } else {
1308                            rc->avg_length[i] = rc->tot_scaled_length[i];
1309    
1310          /*                          if (i == (XVID_TYPE_IVOP-1)) {
1311           * We can't do bigger frames than first pass, this would be stupid as first                                  /* I Frames total has to be added the boost total */
1312           * pass is quant=2 and that reaching quant=1 is not worth it. We would lose                                  rc->avg_length[i] += ivop_boost_total;
          * many bytes and we would not not gain much quality.  
          */  
         if (desired > s->length) {  
                 rc->curve_comp_error += desired - s->length;  
                 desired = s->length;  
1313          }else{          }else{
1314                  if (desired < rc->min_length[s->type-1]) {                                  /* P/B frames has to taxed */
1315                          if (s->type == XVID_TYPE_IVOP){                                  rc->avg_length[i] *= rc->pb_iboost_tax_ratio;
                                 rc->curve_comp_error -= rc->min_length[XVID_TYPE_IVOP-1] - desired;  
1316                          }                          }
1317                          desired = rc->min_length[s->type-1];  
1318                            /* Finally compute the average frame size */
1319                            rc->avg_length[i] /= (double)rc->count[i];
1320                  }                  }
1321          }          }
1322    
1323          s->desired_length = desired;          /* Assymetric curve compression */
1324            if (rc->param.curve_compression_high || rc->param.curve_compression_low) {
1325                    double symetric_total;
1326                    double assymetric_delta_total;
1327    
1328          /* if this keyframe is too close to the next, reduce it's byte allotment                  /* Like I frame boosting, assymetric curve compression modifies the total
1329             XXX: why do we do this after setting the desired length  */                   * amount of needed bits, we must compute the ratio so we can prescale
1330                     lengths */
1331          if (s->type == XVID_TYPE_IVOP) {                  symetric_total = 0;
1332                  int KFdistance = rc->keyframe_locations[rc->KF_idx] - rc->keyframe_locations[rc->KF_idx - 1];                  assymetric_delta_total = 0;
1333                    for (i=0; i<rc->num_frames; i++) {
1334                            double assymetric_delta;
1335                            double dbytes;
1336                            twopass_stat_t * s = &rc->stats[i];
1337    
1338                  if (KFdistance < rc->param.kftreshold) {                          /* I Frames are not concerned by assymetric scaling */
1339                            if (s->type == XVID_TYPE_IVOP)
1340                                    continue;
1341    
1342                          KFdistance = KFdistance - rc->param.min_key_interval;                          /* During the real run, we would have to apply the iboost tax */
1343                            dbytes = s->scaled_length * rc->pb_iboost_tax_ratio;
1344    
1345                          if (KFdistance >= 0) {                          /* Update the symmetric curve compression total */
1346                                  int KF_min_size;                          symetric_total += dbytes;
1347    
1348                                  KF_min_size = desired * (100 - rc->param.kfreduction) / 100;                          /* Apply assymetric curve compression */
1349                                  if (KF_min_size < 1)                          if (dbytes > rc->avg_length[s->type-1])
1350                                          KF_min_size = 1;                                  assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * (double)rc->param.curve_compression_high / 100.0f;
1351                            else
1352                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * (double)rc->param.curve_compression_low  / 100.0f;
1353    
1354                                  desired = KF_min_size + (desired - KF_min_size) * KFdistance /                          /* Cap to the minimum frame size if needed */
1355                                          (rc->param.kftreshold - rc->param.min_key_interval);                          if (dbytes + assymetric_delta < rc->min_length[s->type-1])
1356                                    assymetric_delta = rc->min_length[s->type-1] - dbytes;
1357    
1358                                  if (desired < 1)                          /* Accumulate after assymetric curve compression */
1359                                          desired = 1;                          assymetric_delta_total += assymetric_delta;
                         }  
                 }  
1360          }          }
1361    
1362          overflow = (int)((double)overflow * desired / rc->avg_length[XVID_TYPE_PVOP-1]);                  /* Compute the tax that all p/b frames have to pay in order to respect the
1363                     * bit distribution changes that the assymetric compression curve imposes
1364          /* Reign in overflow with huge frames */                   * We want assymetric_total = sum(0, n-1, tax.scaled_length)
1365          if (labs(overflow) > labs(rc->overflow)) {                   *      ie assymetric_total = ratio.sum(0, n-1, scaled_length)
1366                  overflow = rc->overflow;                   *         ratio = assymetric_total / symmetric_total */
1367          }                  rc->assymetric_tax_ratio = ((double)symetric_total - (double)assymetric_delta_total) / (double)symetric_total;
   
         /* Make sure overflow doesn't run away */  
         if (overflow > desired * rc->param.max_overflow_improvement / 100) {  
                 desired += (overflow <= desired) ? desired * rc->param.max_overflow_improvement / 100 :  
                         overflow * rc->param.max_overflow_improvement / 100;  
         } else if (overflow < desired * rc->param.max_overflow_degradation / -100){  
                 desired += desired * rc->param.max_overflow_degradation / -100;  
1368          } else {          } else {
1369                  desired += overflow;                  rc->assymetric_tax_ratio = 1.0f;
1370          }          }
1371    
1372          /* Make sure we are not higher than desired frame size */          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Assymetric tax ratio:%.2f\n", rc->assymetric_tax_ratio);
         if (desired > rc->max_length) {  
                 capped_to_max_framesize = 1;  
                 desired = rc->max_length;  
         }  
1373    
1374          /* Make sure to not scale below the minimum framesize */          /* Last bits that need to be reset */
1375          if (desired < rc->min_length[s->type-1])          rc->overflow = 0;
1376                  desired = rc->min_length[s->type-1];          rc->KFoverflow = 0;
1377            rc->KFoverflow_partial = 0;
1378            rc->KF_idx = 0;
1379            rc->desired_total = 0;
1380            rc->real_total = 0;
1381    
1382            /* Job done */
1383            return;
1384    }
1385    
1386    /*****************************************************************************
1387     * Still more low level stuff (nothing to do with stats treatment)
1388     ****************************************************************************/
1389    
1390    /* This function returns an allocated string containing a complete line read
1391     * from the file starting at the current position */
1392    static char *
1393    readline(FILE *f)
1394    {
1395            char *buffer = NULL;
1396            int buffer_size = 0;
1397            int pos = 0;
1398    
1399          /*          do {
1400           * Don't laugh at this very 'simple' quant<->filesize relationship, it                  int c;
          * proves to be acurate enough for our algorithm  
          */  
         data->quant= (s->quant * s->length) / desired;  
1401    
1402          /* Let's clip the computed quantizer, if needed */                  /* Read a character from the stream */
1403          if (data->quant < 1) {                  c = fgetc(f);
                 data->quant = 1;  
         } else if (data->quant > 31) {  
                 data->quant = 31;  
         } else if (s->type != XVID_TYPE_IVOP) {  
1404    
1405                  /*                  /* Is that EOF or new line ? */
1406                   * The frame quantizer has not been clipped, this appear to be a good                  if(c == EOF || c == '\n')
1407                   * computed quantizer, however past frames give us some info about how                          break;
                  * 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;  
1408    
1409                          if (rc->bquant_error[data->quant] >= 1.0) {                  /* Do we have to update buffer ? */
1410                                  rc->bquant_error[data->quant] -= 1.0;                  if(pos >= buffer_size - 1) {
1411                                  data->quant++;                          buffer_size += BUF_SZ;
1412                            buffer = (char*)realloc(buffer, buffer_size);
1413                            if (buffer == NULL)
1414                                    return(NULL);
1415                          }                          }
                 } else {  
                         rc->pquant_error[data->quant] += ((double)(s->quant * s->length) / desired) - data->quant;  
1416    
1417                          if (rc->pquant_error[data->quant] >= 1.0) {                  buffer[pos] = c;
1418                                  rc->pquant_error[data->quant] -= 1.0;                  pos++;
1419                                  ++data->quant;          } while(1);
                         }  
                 }  
         }  
1420    
1421          /*          /* Read \n or EOF */
1422           * Now we have a computed quant that is in the right quante range, with a          if (buffer == NULL) {
1423           * possible +1 correction due to cumulated error. We can now safely clip                  /* EOF, so we reached the end of the file, return NULL */
1424           * the quantizer again with user's quant ranges. "Safely" means the Rate                  if(feof(f))
1425           * Control could learn more about this quantizer, this knowledge is useful                          return(NULL);
1426           * for future frames even if it this quantizer won't be really used atm,  
1427           * that's why we don't perform this clipping earlier.                  /* Just an empty line with just a newline, allocate a 1 byte buffer to
1428           */                   * store a zero length string */
1429          if (data->quant < data->min_quant[s->type-1]) {                  buffer = (char*)malloc(1);
1430                  data->quant = data->min_quant[s->type-1];                  if(buffer == NULL)
1431          } else if (data->quant > data->max_quant[s->type-1]) {                          return(NULL);
                 data->quant = data->max_quant[s->type-1];  
1432          }          }
1433    
1434          /*          /* Zero terminated string */
1435           * To avoid big quality jumps from frame to frame, we apply a "security"          buffer[pos] = '\0';
          * rule that makes |last_quant - new_quant| <= 2. This rule only applies  
          * to predicted frames (P and B)  
          */  
         if (s->type != XVID_TYPE_IVOP && rc->last_quant[s->type-1] && capped_to_max_framesize == 0) {  
1436    
1437                  if (data->quant > rc->last_quant[s->type-1] + 2) {          return(buffer);
                         data->quant = rc->last_quant[s->type-1] + 2;  
                         DPRINTF(XVID_DEBUG_RC, "p/b-frame quantizer prevented from rising too steeply");  
1438                  }                  }
1439                  if (data->quant < rc->last_quant[s->type-1] - 2) {  
1440                          data->quant = rc->last_quant[s->type-1] - 2;  /* This function returns a pointer to the first non space char in the given
1441                          DPRINTF(XVID_DEBUG_RC, "p/b-frame quantizer prevented from falling too steeply");   * string */
1442    static char *
1443    skipspaces(char *string)
1444    {
1445            const char spaces[] =
1446                    {
1447                            ' ','\t','\0'
1448                    };
1449            const char *spacechar = spaces;
1450    
1451            if (string == NULL) return(NULL);
1452    
1453            while (*string != '\0') {
1454                    /* Test against space chars */
1455                    while (*spacechar != '\0') {
1456                            if (*string == *spacechar) {
1457                                    string++;
1458                                    spacechar = spaces;
1459                                    break;
1460                  }                  }
1461                            spacechar++;
1462          }          }
1463    
1464          /*                  /* No space char */
1465           * We don't want to pollute the RC history results when our computed quant                  if (*spacechar == '\0') return(string);
          * has been computed from a capped frame size  
          */  
         if (capped_to_max_framesize == 0) {  
                 rc->last_quant[s->type-1] = data->quant;  
1466          }          }
1467    
1468          return 0;          return(string);
1469  }  }
1470    
1471    /* This function returns a boolean that tells if the string is only a
1472     * comment */
1473  static int rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)  static int
1474    iscomment(char *string)
1475  {  {
1476      stat_t * s = &rc->stats[data->frame_num];          const char comments[] =
1477                    {
1478          /* Insufficent stats data */                          '#',';', '%', '\0'
1479      if (data->frame_num >= rc->num_frames)                  };
1480          return 0;          const char *cmtchar = comments;
1481            int iscomment = 0;
1482      rc->quant_count[data->quant]++;  
1483            if (string == NULL) return(1);
1484      if (data->type == XVID_TYPE_IVOP) {  
1485          int kfdiff = (rc->keyframe_locations[rc->KF_idx] -      rc->keyframe_locations[rc->KF_idx - 1]);          string = skipspaces(string);
1486    
1487          rc->overflow += rc->KFoverflow;          while(*cmtchar != '\0') {
1488          rc->KFoverflow = s->desired_length - data->length;                  if(*string == *cmtchar) {
1489                            iscomment = 1;
1490          if (kfdiff > 1) {  // non-consecutive keyframes                          break;
             rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);  
         }else{ // consecutive keyframes  
                         rc->overflow += rc->KFoverflow;  
                         rc->KFoverflow = 0;  
                         rc->KFoverflow_partial = 0;  
1491          }          }
1492          rc->KF_idx++;                  cmtchar++;
     }else{  
         // distribute part of the keyframe overflow  
         rc->overflow += s->desired_length - data->length + rc->KFoverflow_partial;  
         rc->KFoverflow -= rc->KFoverflow_partial;  
1493      }      }
1494    
1495      DPRINTF(XVID_DEBUG_RC, "[%i] quant:%i stats1:%i scaled:%i actual:%i overflow:%i\n",          return(iscomment);
         data->frame_num,  
         data->quant,  
         s->length,  
         s->scaled_length,  
         data->length,  
         rc->overflow);  
   
     return(0);  
1496  }  }
1497    
1498    #if 0
1499    static void
1500  int xvid_plugin_2pass2(void * handle, int opt, void * param1, void * param2)  stats_print(rc_2pass2_t * rc)
 {  
     switch(opt)  
1501      {      {
1502      case XVID_PLG_INFO :          int i;
1503          return 0;          const char frame_type[4] = { 'i', 'p', 'b', 's'};
   
     case XVID_PLG_CREATE :  
         return rc_2pass2_create((xvid_plg_create_t*)param1, param2);  
   
     case XVID_PLG_DESTROY :  
         return rc_2pass2_destroy((rc_2pass2_t*)handle, (xvid_plg_destroy_t*)param1);  
   
     case XVID_PLG_BEFORE :  
         return rc_2pass2_before((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);  
1504    
1505      case XVID_PLG_AFTER :          for (i=0; i<rc->num_frames; i++) {
1506          return rc_2pass2_after((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);                  twopass_stat_t *s = &rc->stats[i];
1507                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- frame:%d type:%c quant:%d stats:%d scaled:%d desired:%d actual:%d overflow(%c):%.2f\n",
1508                                    i, frame_type[s->type-1], -1, s->length, s->scaled_length,
1509                                    s->desired_length, -1, frame_type[s->type-1], -1.0f);
1510      }      }
   
     return XVID_ERR_FAIL;  
1511  }  }
1512    #endif
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