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revision 1041, Thu May 22 22:57:54 2003 UTC revision 1347, Sat Jan 31 14:51:56 2004 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 1.1.2.10 2003-05-22 22:56:22 edgomez Exp $   * $Id: plugin_2pass2.c,v 1.1.2.37 2004-01-31 14:51:56 syskin Exp $
29   *   *
30   *****************************************************************************/   *****************************************************************************/
31    
32    #define BQUANT_PRESCALE
33    #undef COMPENSATE_FORMULA
34    
35    /* forces second pass not to be bigger than first */
36    #undef PASS_SMALLER
37    
38    /* automtically alters overflow controls (strength and improvement/degradation)
39            to fight most common problems without user's knowladge */
40    #define SMART_OVERFLOW_SETTING
41    
42  #include <stdio.h>  #include <stdio.h>
43  #include <math.h>  #include <math.h>
44  #include <limits.h>  #include <limits.h>
45    
 #define RAD2DEG 57.295779513082320876798154814105  
 #define DEG2RAD 0.017453292519943295769236907684886  
   
46  #include "../xvid.h"  #include "../xvid.h"
47  #include "../image/image.h"  #include "../image/image.h"
48    
49    /*****************************************************************************
50     * Some default settings
51     ****************************************************************************/
52    
53    #define DEFAULT_KEYFRAME_BOOST 0
54    #define DEFAULT_OVERFLOW_CONTROL_STRENGTH 10
55    #define DEFAULT_CURVE_COMPRESSION_HIGH 0
56    #define DEFAULT_CURVE_COMPRESSION_LOW 0
57    #define DEFAULT_MAX_OVERFLOW_IMPROVEMENT 10
58    #define DEFAULT_MAX_OVERFLOW_DEGRADATION 10
59    
60    /* Keyframe settings */
61    #define DEFAULT_KFREDUCTION 20
62    #define DEFAULT_KFTHRESHOLD 1
63    
64    /*****************************************************************************
65     * Some default constants (can be tuned)
66     ****************************************************************************/
67    
68    /* Specify the invariant part of the headers bits (header+MV)
69     * as  hlength/cst */
70    #define INVARIANT_HEADER_PART_IVOP 1 /* factor 1.0f   */
71    #define INVARIANT_HEADER_PART_PVOP 2 /* factor 0.5f   */
72    #define INVARIANT_HEADER_PART_BVOP 8 /* factor 0.125f */
73    
74    /*****************************************************************************
75     * Structures
76     ****************************************************************************/
77    
78    /* Statistics */
79  typedef struct {  typedef struct {
80      int type;               /* first pass type */      int type;               /* first pass type */
81      int quant;              /* first pass quant */      int quant;              /* first pass quant */
82          int blks[3];                    /* k,m,y blks */          int blks[3];                    /* k,m,y blks */
83      int length;             /* first pass length */      int length;             /* first pass length */
84            int invariant;          /* what we assume as being invariant between the two passes, it's a sub part of header + MV bits */
85      int scaled_length;      /* scaled length */      int scaled_length;      /* scaled length */
86      int desired_length;     /* desired length; calcuated during encoding */          int desired_length;     /* desired length; calculated during encoding */
87            int error;
88    
89      int zone_mode;   /* XVID_ZONE_xxx */      int zone_mode;   /* XVID_ZONE_xxx */
90      double weight;      double weight;
91  } stat_t;  } twopass_stat_t;
   
   
   
92    
93  /* context struct */  /* Context struct */
94  typedef struct  typedef struct
95  {  {
96      xvid_plugin_2pass2_t param;      xvid_plugin_2pass2_t param;
97    
98      /* constant statistical data */          /*----------------------------------
99             * constant statistical data
100             *--------------------------------*/
101    
102            /* Number of frames of the sequence */
103          int num_frames;          int num_frames;
104    
105            /* Number of Intra frames of the sequence */
106      int num_keyframes;      int num_keyframes;
     uint64_t target;    /* target filesize */  
107    
108      int count[3];   /* count of each frame types */          /* Target filesize to reach */
109      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;  
110    
111      /* dynamic */          /* Count of each frame types */
112            int count[3];
113    
114            /* Total length of each frame types (1st pass) */
115            uint64_t tot_length[3];
116            uint64_t tot_invariant[3];
117    
118            /* Average length of each frame types (used first for 1st pass data and
119             * then for scaled averages */
120            double avg_length[3];
121    
122            /* Minimum frame length allowed for each frame type */
123            int min_length[3];
124    
125            /* Total bytes per frame type once the curve has been scaled
126             * NB: advanced parameters do not change this value. This field
127             *     represents the total scaled w/o any advanced settings */
128            uint64_t tot_scaled_length[3];
129    
130            /* Maximum observed frame size observed during the first pass, the RC
131             * will try tp force all frame sizes in the second pass to be under that
132             * limit */
133            int max_length;
134    
135            /*----------------------------------
136             * Zones statistical data
137             *--------------------------------*/
138    
139            /* Total length used by XVID_ZONE_QUANT zones */
140            uint64_t tot_quant;
141            uint64_t tot_quant_invariant;
142    
143            /* Holds the total amount of frame bytes, zone weighted (only scalable
144             * part of frame bytes) */
145            uint64_t tot_weighted;
146    
147            /*----------------------------------
148             * Advanced settings helper ratios
149             *--------------------------------*/
150    
151            /* This the ratio that has to be applied to all p/b frames in order
152             * to reserve/retrieve bits for/from keyframe boosting and consecutive
153             * keyframe penalty */
154            double pb_iboost_tax_ratio;
155    
156            /* This the ratio to apply to all b/p frames in order to respect the
157             * assymetric curve compression while respecting a target filesize
158             * NB: The assymetric delta gain has to be computed before this ratio
159             *     is applied, and then the delta is added to the scaled size */
160            double assymetric_tax_ratio;
161    
162            /*----------------------------------
163             * Data from the stats file kept
164             * into RAM for easy access
165             *--------------------------------*/
166    
167            /* Array of keyframe locations
168             * eg: rc->keyframe_locations[100] returns the frame number of the 100th
169             *     keyframe */
170      int * keyframe_locations;      int * keyframe_locations;
     stat_t * stats;  
171    
172      double pquant_error[32];          /* Index of the last keyframe used in the keyframe_location */
173      double bquant_error[32];          int KF_idx;
174      int quant_count[32];  
175            /* Array of all 1st pass data file -- see the twopass_stat_t structure
176             * definition for more details */
177            twopass_stat_t * stats;
178    
179            /*----------------------------------
180             * Histerysis helpers
181             *--------------------------------*/
182    
183            /* This field holds the int2float conversion errors of each quant per
184             * frame type, this allow the RC to keep track of rouding error and thus
185             * increase or decrease the chosen quant according to this residue */
186            double quant_error[3][32];
187    
188            /* This fields stores the count of each quant usage per frame type
189             * No real role but for debugging */
190            int quant_count[3][32];
191    
192            /* Last valid quantizer used per frame type, it allows quantizer
193             * increament/decreament limitation in order to avoid big image quality
194             * "jumps" */
195      int last_quant[3];      int last_quant[3];
196    
197      double curve_comp_error;          /*----------------------------------
198      int overflow;           * Overflow control
199      int KFoverflow;           *--------------------------------*/
200      int KFoverflow_partial;  
201      int KF_idx;          /* Current overflow that has to be distributed to p/b frames */
202            double overflow;
203    
204            /* Total overflow for keyframes -- not distributed directly */
205            double KFoverflow;
206    
207            /* Amount of keyframe overflow to introduce to the global p/b frame
208             * overflow counter at each encoded frame */
209            double KFoverflow_partial;
210    
211            /* Unknown ???
212             * ToDo: description */
213      double fq_error;      double fq_error;
 } rc_2pass2_t;  
214    
215            int min_quant; /* internal minimal quant, prevents wrong quants from being used */
216    
217            /*----------------------------------
218  #define BUF_SZ 1024           * Debug
219  #define MAX_COLS    5           *--------------------------------*/
220            double desired_total;
221            double real_total;
222    } rc_2pass2_t;
223    
224    
225  /* open stats file, and count num frames */  /*****************************************************************************
226     * Sub plugin functions prototypes
227     ****************************************************************************/
228    
229    static int rc_2pass2_create(xvid_plg_create_t * create, rc_2pass2_t ** handle);
230    static int rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data);
231    static int rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data);
232    static int rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy);
233    
234    /*****************************************************************************
235     * Plugin definition
236     ****************************************************************************/
237    
238  static int det_stats_length(rc_2pass2_t * rc, char * filename)  int
239    xvid_plugin_2pass2(void * handle, int opt, void * param1, void * param2)
240  {  {
241      FILE * f;          switch(opt) {
242      int n, ignore;          case XVID_PLG_INFO :
243      char type;          case XVID_PLG_FRAME :
   
     rc->num_frames = 0;  
     rc->num_keyframes = 0;  
   
     if ((f = fopen(filename, "rt")) == NULL)  
244          return 0;          return 0;
245    
246      while((n = fscanf(f, "%c %d %d %d %d %d %d\n",          case XVID_PLG_CREATE :
247          &type, &ignore, &ignore, &ignore, &ignore, &ignore, &ignore)) != EOF) {                  return rc_2pass2_create((xvid_plg_create_t*)param1, param2);
         if (type == 'i') {  
             rc->num_frames++;  
             rc->num_keyframes++;  
         }else if (type == 'p' || type == 'b' || type == 's') {  
             rc->num_frames++;  
         }  
     }  
248    
249      fclose(f);          case XVID_PLG_DESTROY :
250                    return rc_2pass2_destroy((rc_2pass2_t*)handle, (xvid_plg_destroy_t*)param1);
251    
252            case XVID_PLG_BEFORE :
253                    return rc_2pass2_before((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);
254    
255      return 1;          case XVID_PLG_AFTER :
256                    return rc_2pass2_after((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);
257  }  }
258    
259            return XVID_ERR_FAIL;
260    }
261    
262    /*****************************************************************************
263     * Sub plugin functions definitions
264     ****************************************************************************/
265    
266    /* First a few local helping function prototypes */
267    static  int statsfile_count_frames(rc_2pass2_t * rc, char * filename);
268    static  int statsfile_load(rc_2pass2_t *rc, char * filename);
269    static void zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create);
270    static void first_pass_stats_prepare_data(rc_2pass2_t * rc);
271    static void first_pass_scale_curve_internal(rc_2pass2_t *rc);
272    static void scaled_curve_apply_advanced_parameters(rc_2pass2_t * rc);
273    #if 0
274    static void stats_print(rc_2pass2_t * rc);
275    #endif
276    
277  /* open stats file(s) and read into rc->stats array */  /*----------------------------------------------------------------------------
278     *--------------------------------------------------------------------------*/
279    
280  static int load_stats(rc_2pass2_t *rc, char * filename)  static int
281    rc_2pass2_create(xvid_plg_create_t * create, rc_2pass2_t **handle)
282  {  {
283      FILE * f;          xvid_plugin_2pass2_t * param = (xvid_plugin_2pass2_t *)create->param;
284      int i, not_scaled;          rc_2pass2_t * rc;
285            int i;
286    
287            rc = malloc(sizeof(rc_2pass2_t));
288            if (rc == NULL)
289                    return XVID_ERR_MEMORY;
290    
291      if ((f = fopen(filename, "rt"))==NULL)          rc->param = *param;
         return 0;  
292    
293      i = 0;          /* Initialize all defaults */
294          not_scaled = 0;  #define _INIT(a, b) if((a) <= 0) (a) = (b)
295      while(i < rc->num_frames) {          /* Let's set our defaults if needed */
296          stat_t * s = &rc->stats[i];          _INIT(rc->param.keyframe_boost, DEFAULT_KEYFRAME_BOOST);
297          int n;          _INIT(rc->param.overflow_control_strength, DEFAULT_OVERFLOW_CONTROL_STRENGTH);
298          char type;          _INIT(rc->param.curve_compression_high, DEFAULT_CURVE_COMPRESSION_HIGH);
299            _INIT(rc->param.curve_compression_low, DEFAULT_CURVE_COMPRESSION_LOW);
300            _INIT(rc->param.max_overflow_improvement, DEFAULT_MAX_OVERFLOW_IMPROVEMENT);
301            _INIT(rc->param.max_overflow_degradation,  DEFAULT_MAX_OVERFLOW_DEGRADATION);
302    
303            /* Keyframe settings */
304            _INIT(rc->param.kfreduction, DEFAULT_KFREDUCTION);
305            _INIT(rc->param.kfthreshold, DEFAULT_KFTHRESHOLD);
306    #undef _INIT
307    
308                  s->scaled_length = 0;          /* Initialize some stuff to zero */
309          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);          for(i=0; i<3; i++) {
310          if (n == EOF) break;                  int j;
311                  if (n < 7) {                  for (j=0; j<32; j++) {
312                          not_scaled = 1;                          rc->quant_error[i][j] = 0;
313                            rc->quant_count[i][j] = 0;
314                    }
315                  }                  }
316    
317          if (type == 'i') {          for (i=0; i<3; i++) rc->last_quant[i] = 0;
318              s->type = XVID_TYPE_IVOP;  
319          }else if (type == 'p' || type == 's') {          rc->fq_error = 0;
320              s->type = XVID_TYPE_PVOP;          rc->min_quant = 1;
321          }else if (type == 'b') {  
322              s->type = XVID_TYPE_BVOP;          /* Count frames (and intra frames) in the stats file, store the result into
323          }else{  /* unknown type */           * the rc structure */
324              DPRINTF(XVID_DEBUG_RC, "unknown stats frame type; assuming pvop\n");          if (statsfile_count_frames(rc, param->filename) == -1) {
325              s->type = XVID_TYPE_PVOP;                  DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- ERROR: fopen %s failed\n", param->filename);
326                    free(rc);
327                    return(XVID_ERR_FAIL);
328          }          }
329    
330          i++;          /* Allocate the stats' memory */
331            if ((rc->stats = malloc(rc->num_frames * sizeof(twopass_stat_t))) == NULL) {
332                    free(rc);
333                    return(XVID_ERR_MEMORY);
334      }      }
335    
336      rc->num_frames = i;          /* Allocate keyframes location's memory
337             * PS: see comment in pre_process0 for the +1 location requirement */
338            rc->keyframe_locations = malloc((rc->num_keyframes + 1) * sizeof(int));
339            if (rc->keyframe_locations == NULL) {
340                    free(rc->stats);
341                    free(rc);
342                    return(XVID_ERR_MEMORY);
343            }
344    
345          fclose(f);          /* Load the first pass stats */
346            if (statsfile_load(rc, param->filename) == -1) {
347                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- ERROR: fopen %s failed\n", param->filename);
348                    free(rc->keyframe_locations);
349                    free(rc->stats);
350                    free(rc);
351                    return XVID_ERR_FAIL;
352            }
353    
354      return 1;          /* Compute the target filesize */
355            if (rc->param.bitrate<0) {
356                    /* if negative, bitrate equals the target (in kbytes) */
357                    rc->target = ((uint64_t)(-rc->param.bitrate)) * 1024;
358            } else if (rc->num_frames  < create->fbase/create->fincr) {
359                    /* Source sequence is less than 1s long, we do as if it was 1s long */
360                    rc->target = rc->param.bitrate / 8;
361            } else {
362                    /* Target filesize = bitrate/8 * numframes / framerate */
363                    rc->target =
364                            ((uint64_t)rc->param.bitrate * (uint64_t)rc->num_frames * \
365                             (uint64_t)create->fincr) / \
366                            ((uint64_t)create->fbase * 8);
367  }  }
368    
369            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Frame rate: %d/%d (%ffps)\n",
370                            create->fbase, create->fincr,
371                            (double)create->fbase/(double)create->fincr);
372            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Number of frames: %d\n", rc->num_frames);
373            if(rc->param.bitrate>=0)
374                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Target bitrate: %ld\n", rc->param.bitrate);
375            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Target filesize: %lld\n", rc->target);
376    
377            /* Compensate the average frame overhead caused by the container */
378            rc->target -= rc->num_frames*rc->param.container_frame_overhead;
379            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Container Frame overhead: %d\n", rc->param.container_frame_overhead);
380            if(rc->param.container_frame_overhead)
381                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- New target filesize after container compensation: %lld\n", rc->target);
382    
383  #if 0          /* When bitrate is not given it means it has been scaled by an external
384  static void print_stats(rc_2pass2_t * rc)           * application */
385  {          if (rc->param.bitrate) {
386      int i;                  /* Apply zone settings
387      DPRINTF(XVID_DEBUG_RC, "type quant length scaled_length\n");                   * - set rc->tot_quant which represents the total num of bytes spent in
388                     *   fixed quant zones
389                     * - set rc->tot_weighted which represents the total amount of bytes
390                     *   spent in normal or weighted zones in first pass (normal zones can
391                     *   be considered weight=1)
392                     * - set rc->tot_quant_invariant which represents the total num of bytes
393                     *   spent in fixed quant zones for headers */
394                    zone_process(rc, create);
395            } else {
396                    /* External scaling -- zones are ignored */
397          for (i = 0; i < rc->num_frames; i++) {          for (i = 0; i < rc->num_frames; i++) {
398          stat_t * s = &rc->stats[i];                          rc->stats[i].zone_mode = XVID_ZONE_WEIGHT;
399          DPRINTF(XVID_DEBUG_RC, "%d %d %d %d\n", s->type, s->quant, s->length, s->scaled_length);                          rc->stats[i].weight = 1.0;
400      }      }
401                    rc->tot_quant = 0;
402  }  }
 #endif  
403    
404  /* pre-process the statistics data          /* Gathers some information about first pass stats:
405      - for each type, count, tot_length, min_length, max_length           *  - finds the minimum frame length for each frame type during 1st pass.
406      - set keyframes_locations           *     rc->min_size[]
407             *  - determines the maximum frame length observed (no frame type distinction).
408             *     rc->max_size
409             *  - count how many times each frame type has been used.
410             *     rc->count[]
411             *  - total bytes used per frame type
412             *     rc->tot_length[]
413             *  - total bytes considered invariant between the 2 passes
414             *  - store keyframe location
415             *     rc->keyframe_locations[]
416  */  */
417            first_pass_stats_prepare_data(rc);
418    
419  static void          /* If we have a user bitrate, it means it's an internal curve scaling */
420  pre_process0(rc_2pass2_t * rc)          if (rc->param.bitrate) {
421                    /* Perform internal curve scaling */
422                    first_pass_scale_curve_internal(rc);
423            }
424    
425            /* Apply advanced curve options, and compute some parameters in order to
426             * shape the curve in the BEFORE/AFTER pair of functions */
427            scaled_curve_apply_advanced_parameters(rc);
428    
429            *handle = rc;
430            return(0);
431    }
432    
433    /*----------------------------------------------------------------------------
434     *--------------------------------------------------------------------------*/
435    
436    static int
437    rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy)
438  {  {
439      int i,j;          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- target_total:%lld desired_total:%.2f (%.2f%%) actual_total:%.2f (%.2f%%)\n",
440                            rc->target,
441                            rc->desired_total,
442                            100*rc->desired_total/(double)rc->target,
443                            rc->real_total,
444                            100*rc->real_total/(double)rc->target);
445    
446      for (i=0; i<3; i++) {          free(rc->keyframe_locations);
447          rc->count[i]=0;          free(rc->stats);
448          rc->tot_length[i] = 0;          free(rc);
449          rc->last_quant[i] = 0;          return(0);
                 rc->min_length[i] = INT_MAX;  
450      }      }
451    
452          rc->max_length = INT_MIN;  /*----------------------------------------------------------------------------
453     *--------------------------------------------------------------------------*/
454    
455      for (i=j=0; i<rc->num_frames; i++) {  static int
456          stat_t * s = &rc->stats[i];  rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)
457    {
458            twopass_stat_t * s = &rc->stats[data->frame_num];
459            double dbytes;
460            double scaled_quant;
461            double overflow;
462            int capped_to_max_framesize = 0;
463    
464          rc->count[s->type-1]++;          /* This function is quite long but easy to understand. In order to simplify
465          rc->tot_length[s->type-1] += s->length;           * the code path (a bit), we treat 3 cases that can return immediatly. */
466    
467          if (s->length < rc->min_length[s->type-1]) {          /* First case: Another plugin has already set a quantizer */
468              rc->min_length[s->type-1] = s->length;          if (data->quant > 0)
469          }                  return(0);
470    
471          if (s->length > rc->max_length) {          /* Second case: insufficent stats data
472              rc->max_length = s->length;           * We can't guess much what we should do, let core decide all alone */
473            if (data->frame_num >= rc->num_frames) {
474                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- stats file too short (now processing frame %d)",
475                            data->frame_num);
476                    return(0);
477          }          }
478    
479          if (s->type == XVID_TYPE_IVOP) {          /* Third case: We are in a Quant zone
480              rc->keyframe_locations[j] = i;           * Quant zones must just ensure we use the same settings as first pass
481              j++;           * So set the quantizer and the type */
482          }          if (s->zone_mode == XVID_ZONE_QUANT) {
483      }                  /* Quant stuff */
484                    rc->fq_error += s->weight;
485                    data->quant = (int)rc->fq_error;
486                    rc->fq_error -= data->quant;
487    
488          /*                  /* The type stuff */
489           * The "per sequence" overflow system considers a natural sequence to be                  data->type = s->type;
          * 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;  
490    
491          DPRINTF(XVID_DEBUG_RC, "Min 1st pass IFrame length: %d\n", rc->min_length[0]);                  /* The only required data for AFTER step is this one for the overflow
492          DPRINTF(XVID_DEBUG_RC, "Min 1st pass PFrame length: %d\n", rc->min_length[1]);                   * control */
493          DPRINTF(XVID_DEBUG_RC, "Min 1st pass BFrame length: %d\n", rc->min_length[2]);                  s->desired_length = s->length;
494    
495                    return(0);
496  }  }
497    
498    
499  /* calculate zone weight "center" */          /*************************************************************************/
500            /*************************************************************************/
501            /*************************************************************************/
502    
503  static void          /*-------------------------------------------------------------------------
504  zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)           * Frame bit allocation first part
505  {           *
506      int i,j;           * First steps apply user settings, just like it is done in the theoritical
507      int n = 0;           * scaled_curve_apply_advanced_parameters
508             *-----------------------------------------------------------------------*/
509    
510      rc->avg_weight = 0.0;          /* Set desired to what we are wanting to obtain for this frame */
511      rc->tot_quant = 0;          dbytes = (double)s->scaled_length;
512    
513            /* IFrame user settings*/
514            if (s->type == XVID_TYPE_IVOP) {
515                    /* Keyframe boosting -- All keyframes benefit from it */
516                    dbytes += dbytes*rc->param.keyframe_boost / 100;
517    
518    #if 0 /* ToDo: decide how to apply kfthresholding */
519    #endif
520            } else {
521    
522      if (create->num_zones == 0) {                  /* P/S/B frames must reserve some bits for iframe boosting */
523          for (j = 0; j < rc->num_frames; j++) {                  dbytes *= rc->pb_iboost_tax_ratio;
524              rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;  
525              rc->stats[j].weight = 1.0;                  /* Apply assymetric curve compression */
526                    if (rc->param.curve_compression_high || rc->param.curve_compression_low) {
527                            double assymetric_delta;
528    
529                            /* Compute the assymetric delta, this is computed before applying
530                             * the tax, as done in the pre_process function */
531                            if (dbytes > rc->avg_length[s->type-1])
532                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_high / 100.0;
533                            else
534                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_low  / 100.0;
535    
536                            /* Now we must apply the assymetric tax, else our curve compression
537                             * would not give a theoritical target size equal to what it is
538                             * expected */
539                            dbytes *= rc->assymetric_tax_ratio;
540    
541                            /* Now we can add the assymetric delta */
542                            dbytes += assymetric_delta;
543          }          }
         rc->avg_weight += rc->num_frames * 1.0;  
         n += rc->num_frames;  
544      }      }
545    
546            /* That is what we would like to have -- Don't put that chunk after
547             * overflow control, otherwise, overflow is counted twice and you obtain
548             * half sized bitrate sequences */
549            s->desired_length  = (int)dbytes;
550            rc->desired_total += dbytes;
551    
552      for(i=0; i < create->num_zones; i++) {          /*------------------------------------------------------------------------
553             * Frame bit allocation: overflow control part.
554             *
555             * Unlike the theoritical scaled_curve_apply_advanced_parameters, here
556             * it's real encoding and we need to make sure we don't go so far from
557             * what is our ideal scaled curve.
558             *-----------------------------------------------------------------------*/
559    
560            /* Compute the overflow we should compensate */
561            if (s->type != XVID_TYPE_IVOP || rc->overflow > 0) {
562                    double frametype_factor;
563                    double framesize_factor;
564    
565          int next = (i+1<create->num_zones) ? create->zones[i+1].frame : rc->num_frames;                  /* Take only the desired part of overflow */
566                    overflow = rc->overflow;
567    
568          if (i==0 && create->zones[i].frame > 0) {                  /* Factor that will take care to decrease the overflow applied
569              for (j = 0; j < create->zones[i].frame && j < rc->num_frames; j++) {                   * according to the importance of this frame type in term of
570                  rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;                   * overall size */
571                  rc->stats[j].weight = 1.0;                  frametype_factor  = rc->count[XVID_TYPE_IVOP-1]*rc->avg_length[XVID_TYPE_IVOP-1];
572              }                  frametype_factor += rc->count[XVID_TYPE_PVOP-1]*rc->avg_length[XVID_TYPE_PVOP-1];
573              rc->avg_weight += create->zones[i].frame * 1.0;                  frametype_factor += rc->count[XVID_TYPE_BVOP-1]*rc->avg_length[XVID_TYPE_BVOP-1];
574              n += create->zones[i].frame;                  frametype_factor /= rc->count[s->type-1]*rc->avg_length[s->type-1];
575          }                  frametype_factor  = 1/frametype_factor;
576    
577                    /* Factor that will take care not to compensate too much for this frame
578                     * size */
579                    framesize_factor  = dbytes;
580                    framesize_factor /= rc->avg_length[s->type-1];
581    
582          if (create->zones[i].mode == XVID_ZONE_WEIGHT) {                  /* Treat only the overflow part concerned by this frame type and size */
583              for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {                  overflow *= frametype_factor;
584                  rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;  #if 0
585                  rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;                  /* Leave this one alone, as it impacts badly on quality */
586              }                  overflow *= framesize_factor;
587              next -= create->zones[i].frame;  #endif
588              rc->avg_weight += (double)(next * create->zones[i].increment) / (double)create->zones[i].base;  
589              n += next;                  /* Apply the overflow strength imposed by the user */
590          }else{  // XVID_ZONE_QUANT                  overflow *= (rc->param.overflow_control_strength/100.0f);
591              for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {          } else {
592                  rc->stats[j].zone_mode = XVID_ZONE_QUANT;                  /* no negative overflow applied in IFrames because:
593                  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.
594                  rc->tot_quant += rc->stats[j].length;                   *  - there aren't much in typical sequences, so if an IFrame overflows too
595                     *    much, this overflow may impact the next IFrame too much and generate
596                     *    a sequence of poor quality frames */
597                    overflow = 0;
598              }              }
599    
600            /* Make sure we are not trying to compensate more overflow than we even have */
601            if (fabs(overflow) > fabs(rc->overflow))
602                    overflow = rc->overflow;
603    
604            /* Make sure the overflow doesn't make the frame size to get out of the range
605             * [-max_degradation..+max_improvment] */
606            if (overflow > dbytes*rc->param.max_overflow_improvement / 100) {
607                    if(overflow <= dbytes)
608                            dbytes += dbytes * rc->param.max_overflow_improvement / 100;
609                    else
610                            dbytes += overflow * rc->param.max_overflow_improvement / 100;
611            } else if (overflow < - dbytes * rc->param.max_overflow_degradation / 100) {
612                    dbytes -= dbytes * rc->param.max_overflow_degradation / 100;
613            } else {
614                    dbytes += overflow;
615          }          }
616    
617            /*-------------------------------------------------------------------------
618             * Frame bit allocation last part:
619             *
620             * Cap frame length so we don't reach neither bigger frame sizes than first
621             * pass nor smaller than the allowed minimum.
622             *-----------------------------------------------------------------------*/
623    
624    #ifdef PASS_SMALLER
625            if (dbytes > s->length) {
626                    dbytes = s->length;
627      }      }
628      rc->avg_weight = n>0 ? rc->avg_weight/n : 1.0;  #endif
629    
630      DPRINTF(XVID_DEBUG_RC, "center_weight: %f (for %i frames);   fixed_bytes: %i\n", rc->avg_weight, n, rc->tot_quant);          /* Prevent stupid desired sizes under logical values */
631            if (dbytes < rc->min_length[s->type-1]) {
632                    dbytes = rc->min_length[s->type-1];
633  }  }
634    
635            /*------------------------------------------------------------------------
636             * Desired frame length <-> quantizer mapping
637             *-----------------------------------------------------------------------*/
638    
639  /* scale the curve */  #ifdef BQUANT_PRESCALE
640            /* For bframes we prescale the quantizer to avoid too high quant scaling */
641            if(s->type == XVID_TYPE_BVOP) {
642    
643  static void                  twopass_stat_t *b_ref = s;
 internal_scale(rc_2pass2_t *rc)  
 {  
         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;  
644    
645                    /* Find the reference frame */
646                    while(b_ref != &rc->stats[0] && b_ref->type == XVID_TYPE_BVOP)
647                            b_ref--;
648    
649                    /* Compute the original quant */
650                    s->quant  = 2*(100*s->quant - data->bquant_offset);
651                    s->quant += data->bquant_ratio - 1; /* to avoid rounding issues */
652                    s->quant  = s->quant/data->bquant_ratio - b_ref->quant;
653            }
654    #endif
655    
656          /*          /* Don't laugh at this very 'simple' quant<->size relationship, it
657           * Perform an initial scale pass.           * proves to be acurate enough for our algorithm */
658           * if a frame size is scaled underneath our hardcoded minimums, then we          scaled_quant = (double)s->quant*(double)s->length/(double)dbytes;
659           * force the frame size to the minimum, and deduct the original & scaled  
660           * frame length from the original and target total lengths  #ifdef COMPENSATE_FORMULA
661           */          /* We know xvidcore will apply the bframe formula again, so we compensate
662             * it right now to make sure we would not apply it twice */
663            if(s->type == XVID_TYPE_BVOP) {
664    
665          min_size[0] = ((rc->stats[0].blks[0]*22) + 240) / 8;                  twopass_stat_t *b_ref = s;
         min_size[1] = (rc->stats[0].blks[0] + 88) / 8;  
         min_size[2] = 8;  
   
         scaler = (double)target / (double)pass1_length;  
   
         if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {  
                 DPRINTF(XVID_DEBUG_RC, "undersize warning\n");  
         scaler = 1.0;  
         }  
666    
667      DPRINTF(XVID_DEBUG_RC,                  /* Find the reference frame */
668                          "Before any correction: target=%i, tot_length=%i, scaler=%f\n",                  while(b_ref != &rc->stats[0] && b_ref->type == XVID_TYPE_BVOP)
669                          (int)target, (int)pass1_length, scaler);                          b_ref--;
670    
671                    /* Compute the quant it would be if the core did not apply the bframe
672                     * formula */
673                    scaled_quant  = 100*scaled_quant - data->bquant_offset;
674                    scaled_quant += data->bquant_ratio - 1; /* to avoid rouding issues */
675                    scaled_quant /= data->bquant_ratio;
676            }
677    #endif
678    
679          for (i=0; i<rc->num_frames; i++) {          /* Quantizer has been scaled using floating point operations/results, we
680                  stat_t * s = &rc->stats[i];           * must cast it to integer */
681                  int len;          data->quant = (int)scaled_quant;
682    
683          if (s->zone_mode == XVID_ZONE_QUANT) {          /* Let's clip the computed quantizer, if needed */
684              s->scaled_length = s->length;          if (data->quant < 1) {
685          }else {                  data->quant = 1;
686                      len = (int)((double)s->length * scaler * s->weight / rc->avg_weight);          } else if (data->quant > 31) {
687                      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;  
688                      }else{                      }else{
689                              s->scaled_length = 0;  
690                      }                  /* The frame quantizer has not been clipped, this appears to be a good
691                     * computed quantizer, do not loose quantizer decimal part that we
692                     * accumulate for later reuse when its sum represents a complete
693                     * unit. */
694                    rc->quant_error[s->type-1][data->quant] += scaled_quant - (double)data->quant;
695    
696                    if (rc->quant_error[s->type-1][data->quant] >= 1.0) {
697                            rc->quant_error[s->type-1][data->quant] -= 1.0;
698                            data->quant++;
699                    } else if (rc->quant_error[s->type-1][data->quant] <= -1.0) {
700                            rc->quant_error[s->type-1][data->quant] += 1.0;
701                            data->quant--;
702          }          }
703          }          }
704    
705      scaler = (double)target / (double)pass1_length;          /* Now we have a computed quant that is in the right quante range, with a
706      if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {           * possible +1 correction due to cumulated error. We can now safely clip
707                  DPRINTF(XVID_DEBUG_RC,"undersize warning\n");           * the quantizer again with user's quant ranges. "Safely" means the Rate
708                  scaler = 1.0;           * Control could learn more about this quantizer, this knowledge is useful
709             * for future frames even if it this quantizer won't be really used atm,
710             * that's why we don't perform this clipping earlier. */
711            if (data->quant < data->min_quant[s->type-1]) {
712                    data->quant = data->min_quant[s->type-1];
713            } else if (data->quant > data->max_quant[s->type-1]) {
714                    data->quant = data->max_quant[s->type-1];
715          }          }
716    
717          DPRINTF(XVID_DEBUG_RC,          if (data->quant < rc->min_quant) data->quant = rc->min_quant;
                         "After correction: target=%i, tot_length=%i, scaler=%f\n",  
                         (int)target, (int)pass1_length, scaler);  
718    
719          for (i=0; i<rc->num_frames; i++) {          /* To avoid big quality jumps from frame to frame, we apply a "security"
720                  stat_t * s = &rc->stats[i];           * rule that makes |last_quant - new_quant| <= 2. This rule only applies
721             * to predicted frames (P and B) */
722            if (s->type != XVID_TYPE_IVOP && rc->last_quant[s->type-1] && capped_to_max_framesize == 0) {
723    
724                  if (s->scaled_length==0) {      /* ignore frame with forced frame sizes */                  if (data->quant > rc->last_quant[s->type-1] + 2) {
725                          s->scaled_length = (int)((double)s->length * scaler * s->weight / rc->avg_weight);                          data->quant = rc->last_quant[s->type-1] + 2;
726                            DPRINTF(XVID_DEBUG_RC,
727                                            "[xvid rc] -- frame %d p/b-frame quantizer prevented from rising too steeply\n",
728                                            data->frame_num);
729                  }                  }
730                    if (data->quant < rc->last_quant[s->type-1] - 2) {
731                            data->quant = rc->last_quant[s->type-1] - 2;
732                            DPRINTF(XVID_DEBUG_RC,
733                                            "[xvid rc] -- frame:%d p/b-frame quantizer prevented from falling too steeply\n",
734                                            data->frame_num);
735          }          }
736  }  }
737    
738            /* We don't want to pollute the RC histerisis when our computed quant has
739             * been computed from a capped frame size */
740            if (capped_to_max_framesize == 0)
741                    rc->last_quant[s->type-1] = data->quant;
742    
743            /* Don't forget to force 1st pass frame type ;-) */
744            data->type = s->type;
745    
746            return 0;
747    }
748    
749    /*----------------------------------------------------------------------------
750     *--------------------------------------------------------------------------*/
751    
752  static void  static int
753  pre_process1(rc_2pass2_t * rc)  rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)
754  {  {
755      int i;          const char frame_type[4] = { 'i', 'p', 'b', 's'};
756      double total1, total2;          twopass_stat_t * s = &rc->stats[data->frame_num];
     uint64_t ivop_boost_total;  
757    
758      ivop_boost_total = 0;          /* Insufficent stats data */
759      rc->curve_comp_error = 0;          if (data->frame_num >= rc->num_frames)
760                    return 0;
761    
762      for (i=0; i<3; i++) {          /* Update the quantizer counter */
763          rc->tot_scaled_length[i] = 0;          rc->quant_count[s->type-1][data->quant]++;
     }  
   
     for (i=0; i<rc->num_frames; i++) {  
         stat_t * s = &rc->stats[i];  
764    
765          rc->tot_scaled_length[s->type-1] += s->scaled_length;          /* Update the frame type overflow */
766            if (data->type == XVID_TYPE_IVOP) {
767                    int kfdiff = 0;
768    
769          if (s->type == XVID_TYPE_IVOP) {                  if(rc->KF_idx != rc->num_frames -1) {
770              ivop_boost_total += s->scaled_length * rc->param.keyframe_boost / 100;                          kfdiff  = rc->keyframe_locations[rc->KF_idx+1];
771          }                          kfdiff -= rc->keyframe_locations[rc->KF_idx];
772      }      }
773    
774      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 */
775                                          (rc->tot_scaled_length[XVID_TYPE_PVOP-1] + rc->tot_scaled_length[XVID_TYPE_BVOP-1]));                  rc->overflow += rc->KFoverflow;
776    
777      for(i=0; i<3; i++) {                  /* Store the frame overflow to the keyframe accumulator */
778          if (rc->count[i] == 0 || rc->movie_curve == 0) {                  rc->KFoverflow = s->desired_length - data->length;
779              rc->avg_length[i] = 1;  
780                    if (kfdiff > 1) {
781                            /* Non-consecutive keyframes case:
782                             * We can then divide this total keyframe overflow into equal parts
783                             * that we will distribute into regular overflow at each frame
784                             * between the sequence bounded by two IFrames */
785                            rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);
786          }else{          }else{
787              rc->avg_length[i] = rc->tot_scaled_length[i] / rc->count[i] / rc->movie_curve;                          /* Consecutive keyframes case:
788          }                           * Flush immediatly the keyframe overflow and reset keyframe
789                             * overflow */
790                            rc->overflow += rc->KFoverflow;
791                            rc->KFoverflow = 0;
792                            rc->KFoverflow_partial = 0;
793      }      }
794                    rc->KF_idx++;
795            } else {
796                    /* Accumulate the frame overflow */
797                    rc->overflow += s->desired_length - data->length;
798    
799      /* alt curve stuff here */                  /* Distribute part of the keyframe overflow */
800                    rc->overflow += rc->KFoverflow_partial;
801    
802      if (rc->param.use_alt_curve) {                  /* Don't forget to substract that same amount from the total keyframe
803          const double avg_pvop = rc->avg_length[XVID_TYPE_PVOP-1];                   * overflow */
804          const uint64_t tot_pvop = rc->tot_length[XVID_TYPE_PVOP-1];                  rc->KFoverflow -= rc->KFoverflow_partial;
805          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];  
806    
807                  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);
808                  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;  
809    
810          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",
811              if (tot_bvop + tot_pvop > tot_scaled_bvop + tot_scaled_pvop) {                          data->frame_num,
812                                  rc->param.alt_curve_min_rel_qual = (int)(100.0 - (100.0 - 100.0 /                          frame_type[data->type-1],
813                                          ((double)(tot_pvop + tot_bvop) / (double)(tot_scaled_pvop + tot_scaled_bvop))) * (double)rc->param.alt_curve_auto_str / 100.0);                          data->quant,
814                            s->length,
815                            s->scaled_length,
816                            s->desired_length,
817                            s->desired_length - s->error,
818                            -s->error,
819                            rc->overflow);
820    
821                                  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;  
             }  
822          }          }
                 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;  
823    
824          if (rc->param.alt_curve_low_dist > 100) {  /*****************************************************************************
825                          switch(rc->param.alt_curve_type) {   * Helper functions definition
826              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)));  
                         }  
                 }  
     }  
     /* --- */  
827    
828    /* Default buffer size for reading lines */
829    #define BUF_SZ   1024
830    
831      total1=total2=0;  /* Helper functions for reading/parsing the stats file */
832      for (i=0; i<rc->num_frames; i++) {  static char *skipspaces(char *string);
833          stat_t * s = &rc->stats[i];  static int iscomment(char *string);
834    static char *readline(FILE *f);
835    
836    /* This function counts the number of frame entries in the stats file
837     * It also counts the number of I Frames */
838    static int
839    statsfile_count_frames(rc_2pass2_t * rc, char * filename)
840    {
841            FILE * f;
842            char *line;
843            int lines;
844    
845          if (s->type != XVID_TYPE_IVOP) {          rc->num_frames = 0;
846              double dbytes,dbytes2;          rc->num_keyframes = 0;
847    
848              dbytes = s->scaled_length / rc->movie_curve;          if ((f = fopen(filename, "rb")) == NULL)
849              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];  
850    
851              if (rc->param.use_alt_curve) {          lines = 0;
852                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {          while ((line = readline(f)) != NULL) {
853    
854                      if (dbytes >= rc->alt_curve_high) {                  char *ptr;
855                                                  dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev);                  char type;
856                      }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))));  
                                                 }  
                                         }  
857    
858                  }                  lines++;
859    
860                    /* We skip spaces */
861                    ptr = skipspaces(line);
862    
863              }else{                  /* Skip coment lines or empty lines */
864                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                  if(iscomment(ptr) || *ptr == '\0') {
865                      dbytes2=((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_high / 100.0);                          free(line);
866                  }else{                          continue;
                                 dbytes2 = ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_low / 100.0);  
                 }  
867              }              }
868    
869              if (s->type == XVID_TYPE_BVOP) {                  /* Read the stat line from buffer */
870                              dbytes2 *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];                  fields = sscanf(ptr, "%c", &type);
871                              if (dbytes2 < rc->min_length[XVID_TYPE_BVOP-1])  
872                                      dbytes2 = rc->min_length[XVID_TYPE_BVOP-1];                  /* Valid stats files have at least 7 fields */
873              }else{                  if (fields == 1) {
874                              if (dbytes2 < rc->min_length[XVID_TYPE_PVOP-1])                          switch(type) {
875                                      dbytes2 = rc->min_length[XVID_TYPE_PVOP-1];                          case 'i':
876                            case 'I':
877                                    rc->num_keyframes++;
878                            case 'p':
879                            case 'P':
880                            case 'b':
881                            case 'B':
882                            case 's':
883                            case 'S':
884                                    rc->num_frames++;
885                                    break;
886                            default:
887                                    DPRINTF(XVID_DEBUG_RC,
888                                                    "[xvid rc] -- WARNING: L%d unknown frame type used (%c).\n",
889                                                    lines, type);
890              }              }
891              total2 += dbytes2;                  } else {
892                                    DPRINTF(XVID_DEBUG_RC,
893                                                    "[xvid rc] -- WARNING: L%d misses some stat fields (%d).\n",
894                                                    lines, 7-fields);
895          }          }
896    
897                    /* Free the line buffer */
898                    free(line);
899      }      }
900    
901      rc->curve_comp_scale = total1 / total2;          /* We are done with the file */
902            fclose(f);
903    
904      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));  
905      }      }
906    
907      if (rc->param.use_alt_curve) {  /* open stats file(s) and read into rc->stats array */
908          int bonus_bias = rc->param.alt_curve_bonus_bias;  static int
909          int oldquant = 1;  statsfile_load(rc_2pass2_t *rc, char * filename)
910    {
911            FILE * f;
912            int processed_entries;
913    
914              if (rc->param.alt_curve_use_auto_bonus_bias)          /* Opens the file */
915                      bonus_bias = rc->param.alt_curve_min_rel_qual;          if ((f = fopen(filename, "rb"))==NULL)
916                    return(-1);
917    
918              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;
919              rc->curve_comp_scale = ((total1 - total2) * (1.0 - (double)bonus_bias / 100.0) + total2) / total2;          while(processed_entries < rc->num_frames) {
920                    char type;
921                    int fields;
922                    twopass_stat_t * s = &rc->stats[processed_entries];
923                    char *line, *ptr;
924    
925                    /* Read the line from the file */
926                    if((line = readline(f)) == NULL)
927                            break;
928    
929          /* special info for alt curve:  bias bonus and quantizer thresholds */                  /* We skip spaces */
930                    ptr = skipspaces(line);
931    
932                  DPRINTF(XVID_DEBUG_RC, "avg scaled framesize:%i\n", (int)rc->avg_length[XVID_TYPE_PVOP-1]);                  /* Skip comment lines or empty lines */
933                  DPRINTF(XVID_DEBUG_RC, "bias bonus:%i bytes\n", (int)rc->alt_curve_curve_bias_bonus);                  if(iscomment(ptr) || *ptr == '\0') {
934                            free(line);
935                            continue;
936                    }
937    
938                  for (i=1; i <= (int)(rc->alt_curve_high*2)+1; i++) {                  /* Reset this field that is optional */
939              double curve_temp, dbytes;                  s->scaled_length = 0;
             int newquant;  
940    
941              dbytes = i;                  /* Convert the fields */
942                          if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                  fields = sscanf(ptr,
943                  if (dbytes >= rc->alt_curve_high) {                                                  "%c %d %d %d %d %d %d %d\n",
944                                          curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev);                                                  &type,
945                  }else{                                                  &s->quant,
946                                          switch(rc->param.alt_curve_type)                                                  &s->blks[0], &s->blks[1], &s->blks[2],
947                                          {                                                  &s->length, &s->invariant /* not really yet */,
948                                          case XVID_CURVE_SINE :                                                  &s->scaled_length);
949                                                  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)));  
950                                                  break;                  /* Free line buffer, we don't need it anymore */
951                                          case XVID_CURVE_LINEAR :                  free(line);
952                                                  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);  
953                    /* Fail silently, this has probably been warned in
954                     * statsfile_count_frames */
955                    if(fields != 7 && fields != 8)
956                            continue;
957    
958                    /* Convert frame type and compute the invariant length part */
959                    switch(type) {
960                    case 'i':
961                    case 'I':
962                            s->type = XVID_TYPE_IVOP;
963                            s->invariant /= INVARIANT_HEADER_PART_IVOP;
964                                                  break;                                                  break;
965                                          case XVID_CURVE_COSINE :                  case 'p':
966                                                  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':
967                                          }                  case 's':
968                                  }                  case 'S':
969                          }else{                          s->type = XVID_TYPE_PVOP;
970                  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)));  
971                                                  break;                                                  break;
972                                          case XVID_CURVE_LINEAR :                  case 'b':
973                                                  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':
974                            s->type = XVID_TYPE_BVOP;
975                            s->invariant /= INVARIANT_HEADER_PART_BVOP;
976                                                  break;                                                  break;
977                                          case XVID_CURVE_COSINE :                  default:
978                                                  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 */
979                            continue;
980                                          }                                          }
                                 }  
                         }  
   
                         if (rc->movie_curve > 1.0)  
                                 dbytes *= rc->movie_curve;  
981    
982                          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 */
983                          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\n", newquant, i, percent);  
                                 }  
                         }  
984                  }                  }
985    
986      }          /* Close the file */
987            fclose(f);
988    
989      rc->overflow = 0;          return(0);
     rc->KFoverflow = 0;  
     rc->KFoverflow_partial = 0;  
     rc->KF_idx = 1;  
990  }  }
991    
992    /* pre-process the statistics data
993     * - for each type, count, tot_length, min_length, max_length
994     * - set keyframes_locations, tot_prescaled */
995  static int rc_2pass2_create(xvid_plg_create_t * create, rc_2pass2_t ** handle)  static void
996    first_pass_stats_prepare_data(rc_2pass2_t * rc)
997  {  {
998      xvid_plugin_2pass2_t * param = (xvid_plugin_2pass2_t *)create->param;          int i,j;
     rc_2pass2_t * rc;  
     int i;  
999    
1000      rc = malloc(sizeof(rc_2pass2_t));          /* *rc fields initialization
1001      if (rc == NULL)           * NB: INT_MAX and INT_MIN are used in order to be immediately replaced
1002          return XVID_ERR_MEMORY;           *     with real values of the 1pass */
1003            for (i=0; i<3; i++) {
1004                    rc->count[i]=0;
1005                    rc->tot_length[i] = 0;
1006                    rc->tot_invariant[i] = 0;
1007                    rc->min_length[i] = INT_MAX;
1008            }
1009    
1010      rc->param = *param;          rc->max_length = INT_MIN;
1011            rc->tot_weighted = 0;
1012    
1013      if (rc->param.keyframe_boost <= 0) rc->param.keyframe_boost = 0;          /* Loop through all frames and find/compute all the stuff this function
1014      if (rc->param.payback_method <= 0) rc->param.payback_method = XVID_PAYBACK_PROP;           * is supposed to do */
1015      if (rc->param.bitrate_payback_delay <= 0) rc->param.bitrate_payback_delay = 250;          for (i=j=0; i<rc->num_frames; i++) {
1016      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;  
1017    
1018      if (!det_stats_length(rc, param->filename)){                  rc->count[s->type-1]++;
1019          DPRINTF(XVID_DEBUG_RC,"fopen %s failed\n", param->filename);                  rc->tot_length[s->type-1] += s->length;
1020          free(rc);                  rc->tot_invariant[s->type-1] += s->invariant;
1021          return XVID_ERR_FAIL;                  if (s->zone_mode != XVID_ZONE_QUANT)
1022      }                          rc->tot_weighted += (int)(s->weight*(s->length - s->invariant));
1023    
1024      if ((rc->stats = malloc(rc->num_frames * sizeof(stat_t))) == NULL) {                  if (s->length < rc->min_length[s->type-1]) {
1025          free(rc);                          rc->min_length[s->type-1] = s->length;
         return XVID_ERR_MEMORY;  
1026      }      }
1027    
1028      /*                  if (s->length > rc->max_length) {
1029           * 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;  
1030      }      }
1031    
1032      if (!load_stats(rc, param->filename)) {                  if (s->type == XVID_TYPE_IVOP) {
1033          DPRINTF(XVID_DEBUG_RC,"fopen %s failed\n", param->filename);                          rc->keyframe_locations[j] = i;
1034          free(rc->keyframe_locations);                          j++;
1035          free(rc->stats);                  }
         free(rc);  
         return XVID_ERR_FAIL;  
1036      }      }
1037    
1038      /* pre-process our stats */          /* NB:
1039             * The "per sequence" overflow system considers a natural sequence to be
1040             * formed by all frames between two iframes, so if we want to make sure
1041             * the system does not go nuts during last sequence, we force the last
1042             * frame to appear in the keyframe locations array. */
1043            rc->keyframe_locations[j] = i;
1044    
1045          if (rc->num_frames  < create->fbase/create->fincr) {          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Min 1st pass IFrame length: %d\n", rc->min_length[0]);
1046                  rc->target = rc->param.bitrate / 8;     /* one second */          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Min 1st pass PFrame length: %d\n", rc->min_length[1]);
1047          }else{          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Min 1st pass BFrame length: %d\n", rc->min_length[2]);
                 rc->target =  
                         ((uint64_t)rc->param.bitrate * (uint64_t)rc->num_frames * (uint64_t)create->fincr) / \  
                         ((uint64_t)create->fbase * 8);  
1048          }          }
1049    
1050      DPRINTF(XVID_DEBUG_RC, "Number of frames: %d\n", rc->num_frames);  /* calculate zone weight "center" */
1051          DPRINTF(XVID_DEBUG_RC, "Frame rate: %d/%d\n", create->fbase, create->fincr);  static void
1052          DPRINTF(XVID_DEBUG_RC, "Target bitrate: %ld\n", rc->param.bitrate);  zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)
1053          DPRINTF(XVID_DEBUG_RC, "Target filesize: %lld\n", rc->target);  {
1054            int i,j;
1055          /* Compensate the mean frame overhead caused by the container */          int n = 0;
         rc->target -= rc->num_frames*rc->param.container_frame_overhead;  
         DPRINTF(XVID_DEBUG_RC, "Container Frame overhead: %d\n", rc->param.container_frame_overhead);  
         DPRINTF(XVID_DEBUG_RC, "Target filesize (after container compensation): %lld\n", rc->target);  
1056    
1057          pre_process0(rc);          rc->tot_quant = 0;
1058            rc->tot_quant_invariant = 0;
1059    
1060          if (rc->param.bitrate) {          if (create->num_zones == 0) {
1061          zone_process(rc, create);                  for (j = 0; j < rc->num_frames; j++) {
1062                  internal_scale(rc);                          rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1063      }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;  
1064          }          }
1065          rc->avg_weight = 1.0;                  n += rc->num_frames;
         rc->tot_quant = 0;  
1066      }      }
         pre_process1(rc);  
1067    
     for (i=0; i<32;i++) {  
         rc->pquant_error[i] = 0;  
         rc->bquant_error[i] = 0;  
         rc->quant_count[i] = 0;  
     }  
1068    
1069      rc->fq_error = 0;          for(i=0; i < create->num_zones; i++) {
1070    
1071      *handle = rc;                  int next = (i+1<create->num_zones) ? create->zones[i+1].frame : rc->num_frames;
         return(0);  
 }  
1072    
1073                    /* Zero weight make no sense */
1074                    if (create->zones[i].increment == 0) create->zones[i].increment = 1;
1075                    /* And obviously an undetermined infinite makes even less sense */
1076                    if (create->zones[i].base == 0) create->zones[i].base = 1;
1077    
1078  static int rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy)                  if (i==0 && create->zones[i].frame > 0) {
1079  {                          for (j = 0; j < create->zones[i].frame && j < rc->num_frames; j++) {
1080      free(rc->keyframe_locations);                                  rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1081      free(rc->stats);                                  rc->stats[j].weight = 1.0;
1082          free(rc);                          }
1083          return(0);                          n += create->zones[i].frame;
1084  }  }
1085    
1086                    if (create->zones[i].mode == XVID_ZONE_WEIGHT) {
1087                            for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {
1088                                    rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1089                                    rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;
1090                            }
1091                            next -= create->zones[i].frame;
1092                            n += next;
1093                    } else{  /* XVID_ZONE_QUANT */
1094                            for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {
1095                                    rc->stats[j].zone_mode = XVID_ZONE_QUANT;
1096                                    rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;
1097                                    rc->tot_quant += rc->stats[j].length;
1098                                    rc->tot_quant_invariant += rc->stats[j].invariant;
1099                            }
1100                    }
1101            }
1102    }
1103    
1104    
1105  static int rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)  /* scale the curve */
1106    static void
1107    first_pass_scale_curve_internal(rc_2pass2_t *rc)
1108  {  {
1109      stat_t * s = &rc->stats[data->frame_num];          int64_t target;
1110      int overflow;          int64_t total_invariant;
1111      int desired;          double scaler;
1112      double dbytes;          int i, num_MBs;
     double curve_temp;  
     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);  
   
         /* Second case: We are in a Quant zone */  
         if (s->zone_mode == XVID_ZONE_QUANT) {  
   
                 rc->fq_error += s->weight;  
                 data->quant = (int)rc->fq_error;  
                 rc->fq_error -= data->quant;  
   
                 s->desired_length = s->length;  
   
                 return(0);  
1113    
1114            /* We only scale texture data ! */
1115            total_invariant  = rc->tot_invariant[XVID_TYPE_IVOP-1];
1116            total_invariant += rc->tot_invariant[XVID_TYPE_PVOP-1];
1117            total_invariant += rc->tot_invariant[XVID_TYPE_BVOP-1];
1118            /* don't forget to substract header bytes used in quant zones, otherwise we
1119             * counting them twice */
1120            total_invariant -= rc->tot_quant_invariant;
1121    
1122            /* We remove the bytes used by the fixed quantizer zones during first pass
1123             * with the same quants, so we know very precisely how much that
1124             * represents */
1125            target  = rc->target;
1126            target -= rc->tot_quant;
1127    
1128            /* Let's compute a linear scaler in order to perform curve scaling */
1129            scaler = (double)(target - total_invariant) / (double)(rc->tot_weighted);
1130    
1131    #ifdef SMART_OVERFLOW_SETTING
1132            if (scaler > 0.9) {
1133                    rc->param.max_overflow_degradation *= 5;
1134                    rc->param.max_overflow_improvement *= 5;
1135                    rc->param.overflow_control_strength *= 3;
1136            } else if (scaler > 0.6) {
1137                    rc->param.max_overflow_degradation *= 2;
1138                    rc->param.max_overflow_improvement *= 2;
1139                    rc->param.overflow_control_strength *= 2;
1140            } else {
1141                    rc->min_quant = 2;
1142          }          }
1143    #endif
1144    
1145          /* Third case: insufficent stats data */          /* Compute min frame lengths (for each frame type) according to the number
1146          if (data->frame_num >= rc->num_frames)           * of MBs. We sum all block type counters of frame 0, this gives us the
1147                  return 0;           * number of MBs.
1148             *
1149             * We compare these hardcoded values with observed values in first pass
1150             * (determined in pre_process0).Then we keep the real minimum. */
1151    
1152          /*          /* Number of MBs */
1153           * The last case is the one every normal minded developer should fear to          num_MBs  = rc->stats[0].blks[0];
1154           * maintain in a project :-)          num_MBs += rc->stats[0].blks[1];
1155           */          num_MBs += rc->stats[0].blks[2];
1156    
1157            /* Minimum for I frames */
1158            if(rc->min_length[XVID_TYPE_IVOP-1] > ((num_MBs*22) + 240) / 8)
1159                    rc->min_length[XVID_TYPE_IVOP-1] = ((num_MBs*22) + 240) / 8;
1160    
1161            /* Minimum for P/S frames */
1162            if(rc->min_length[XVID_TYPE_PVOP-1] > ((num_MBs) + 88)  / 8)
1163                    rc->min_length[XVID_TYPE_PVOP-1] = ((num_MBs) + 88)  / 8;
1164    
1165            /* Minimum for B frames */
1166            if(rc->min_length[XVID_TYPE_BVOP-1] > 8)
1167                    rc->min_length[XVID_TYPE_BVOP-1] = 8;
1168    
1169          /* XXX: why by 8 */          /* Perform an initial scale pass.
1170          overflow = rc->overflow / 8;           *
1171             * If a frame size is scaled underneath our hardcoded minimums, then we
1172             * force the frame size to the minimum, and deduct the original & scaled
1173             * frame length from the original and target total lengths */
1174            for (i=0; i<rc->num_frames; i++) {
1175                    twopass_stat_t * s = &rc->stats[i];
1176                    int len;
1177    
1178          /*                  /* No need to scale frame length for which a specific quantizer is
1179           * The rc->overflow field represents the overflow in current scene (between two                   * specified thanks to zones */
1180           * IFrames) so we must not forget to reset it if we are enetring a new scene                  if (s->zone_mode == XVID_ZONE_QUANT) {
1181           */                          s->scaled_length = s->length;
1182          if (s->type == XVID_TYPE_IVOP) {                          continue;
                 overflow = 0;  
1183          }          }
1184    
1185          desired = s->scaled_length;                  /* Compute the scaled length -- only non invariant data length is scaled */
1186                    len = s->invariant + (int)((double)(s->length-s->invariant) * scaler * s->weight);
1187    
1188          dbytes = desired;                  /* Compare with the computed minimum */
1189          if (s->type == XVID_TYPE_IVOP) {                  if (len < rc->min_length[s->type-1]) {
1190                  dbytes += desired * rc->param.keyframe_boost / 100;                          /* This is a 'forced size' frame, set its frame size to the
1191          }                           * computed minimum */
1192          dbytes /= rc->movie_curve;                          s->scaled_length = rc->min_length[s->type-1];
1193    
1194          /*                          /* Remove both scaled and original size from their respective
1195           * We are now entering in the hard part of the algo, it was first designed                           * total counters, as we prepare a second pass for 'regular'
1196           * to work with i/pframes only streams, so the way it computes things is                           * frames */
1197           * adapted to pframes only. However we can use it if we just take care to                          target -= s->scaled_length;
          * scale the bframes sizes to pframes sizes using the ratio avg_p/avg_p and  
          * then before really using values depending on frame sizes, scaling the  
          * value again with the inverse ratio  
          */  
         if (s->type == XVID_TYPE_BVOP) {  
                 dbytes *= rc->avg_length[XVID_TYPE_PVOP-1] / rc->avg_length[XVID_TYPE_BVOP-1];  
         }  
   
         /*  
          * Apply user's choosen Payback method. Payback helps bitrate to follow the  
          * scaled curve "paying back" past errors in curve previsions.  
          */  
         if (rc->param.payback_method == XVID_PAYBACK_BIAS) {  
                 desired =(int)(rc->curve_comp_error / rc->param.bitrate_payback_delay);  
1198          }else{          }else{
1199                  desired = (int)(rc->curve_comp_error * dbytes /                          /* Do nothing for now, we'll scale this later */
1200                                                  rc->avg_length[XVID_TYPE_PVOP-1] / rc->param.bitrate_payback_delay);                          s->scaled_length = 0;
   
                 if (labs(desired) > fabs(rc->curve_comp_error)) {  
                         desired = (int)rc->curve_comp_error;  
1201                  }                  }
1202          }          }
1203    
1204          rc->curve_comp_error -= desired;          /* The first pass on data substracted all 'forced size' frames from the
1205             * total counters. Now, it's possible to scale the 'regular' frames. */
1206    
1207          /*          /* Scaling factor for 'regular' frames */
1208           * Alt curve treatment is not that hard to understand though the formulas          scaler = (double)(target - total_invariant) / (double)(rc->tot_weighted);
          * seem to be huge. Alt treatment is basically a way to soft/harden the  
          * curve flux applying sine/linear/cosine ratios  
          */  
1209    
1210          /* XXX: warning */          /* Do another pass with the new scaler */
1211          curve_temp = 0;          for (i=0; i<rc->num_frames; i++) {
1212                    twopass_stat_t * s = &rc->stats[i];
1213    
1214          if (rc->param.use_alt_curve) {                  /* Ignore frame with forced frame sizes */
1215                  if (s->type != XVID_TYPE_IVOP)  {                  if (s->scaled_length == 0)
1216                          if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                          s->scaled_length = s->invariant + (int)((double)(s->length-s->invariant) * scaler * s->weight);
                                 if (dbytes >= rc->alt_curve_high) {  
                                         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))));  
1217                                          }                                          }
1218    
1219            /* Job done */
1220            return;
1221                                  }                                  }
1222    
1223    /* Apply all user settings to the scaled curve
1224     * This implies:
1225     *   keyframe boosting
1226     *   high/low compression */
1227    static void
1228    scaled_curve_apply_advanced_parameters(rc_2pass2_t * rc)
1229    {
1230            int i;
1231            int64_t ivop_boost_total;
1232    
1233            /* Reset the rate controller (per frame type) total byte counters */
1234            for (i=0; i<3; i++) rc->tot_scaled_length[i] = 0;
1235    
1236            /* Compute total bytes for each frame type */
1237            for (i=0; i<rc->num_frames;i++) {
1238                    twopass_stat_t *s = &rc->stats[i];
1239                    rc->tot_scaled_length[s->type-1] += s->scaled_length;
1240                          }                          }
1241    
1242                          /*          /* First we compute the total amount of bits needed, as being described by
1243                           * End of code path for curve_temp, as told earlier, we are now           * the scaled distribution. During this pass over the complete stats data,
1244                           * 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:
1245                           * ratio applied earlier           *  - keyframe boosting
1246                           */           *  - keyframe distance penalty */
1247                          if (s->type == XVID_TYPE_BVOP)          rc->KF_idx = 0;
1248                                  curve_temp *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];          ivop_boost_total = 0;
1249            for (i=0; i<rc->num_frames; i++) {
1250                    twopass_stat_t * s = &rc->stats[i];
1251    
1252                          curve_temp = curve_temp * rc->curve_comp_scale + rc->alt_curve_curve_bias_bonus;                  /* Some more work is needed for I frames */
1253                    if (s->type == XVID_TYPE_IVOP) {
1254                            int ivop_boost;
1255    
1256                          desired += ((int)curve_temp);                          /* Accumulate bytes needed for keyframe boosting */
1257                          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];  
1258    
1259                          desired += ((int)dbytes);  #if 0 /* ToDo: decide how to apply kfthresholding */
1260                          rc->curve_comp_error += dbytes - (int)dbytes;  #endif
1261                  }                          /* If the frame size drops under the minimum length, then cap ivop_boost */
1262                            if (ivop_boost + s->scaled_length < rc->min_length[XVID_TYPE_IVOP-1])
1263                                    ivop_boost = rc->min_length[XVID_TYPE_IVOP-1] - s->scaled_length;
1264    
1265          } else if ((rc->param.curve_compression_high + rc->param.curve_compression_low) &&      s->type != XVID_TYPE_IVOP) {                          /* Accumulate the ivop boost */
1266                            ivop_boost_total += ivop_boost;
1267    
1268                  curve_temp = rc->curve_comp_scale;                          /* Don't forget to update the keyframe index */
1269                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                          rc->KF_idx++;
1270                          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);  
1271                  }                  }
1272    
1273                  /*          /* Initialize the IBoost tax ratio for P/S/B frames
1274                   * End of code path for curve_temp, as told earlier, we are now           *
1275                   * 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
1276                   * ratio applied earlier           * additional bits for keyframes (keyframe boosting) or if too much
1277                   */           * keyframe distance is applied, bits retrieved from the keyframes.
1278                  if (s->type == XVID_TYPE_BVOP)           *
1279                          curve_temp *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];           * ie pb_length *= rc->pb_iboost_tax_ratio;
1280             *
1281             *    gives the ideal length of a p/b frame */
1282    
1283                  desired += (int)curve_temp;          /* Compute the total length of p/b/s frames (temporary storage into
1284                  rc->curve_comp_error += curve_temp - (int)curve_temp;           * movie_curve) */
1285          } else {          rc->pb_iboost_tax_ratio  = (double)rc->tot_scaled_length[XVID_TYPE_PVOP-1];
1286                  /*          rc->pb_iboost_tax_ratio += (double)rc->tot_scaled_length[XVID_TYPE_BVOP-1];
1287                   * End of code path for dbytes, as told earlier, we are now  
1288                   * obliged to scale the value to a bframe one using the inverse          /* Compute the ratio described above
1289                   * ratio applied earlier           *     taxed_total = sum(0, n, tax*scaled_length)
1290                   */           * <=> taxed_total = tax.sum(0, n, scaled_length)
1291                  if (s->type == XVID_TYPE_BVOP){           * <=> tax = taxed_total / original_total */
1292                          dbytes *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];          rc->pb_iboost_tax_ratio =
1293                  }                  (rc->pb_iboost_tax_ratio - ivop_boost_total) /
1294                    rc->pb_iboost_tax_ratio;
1295    
1296                  desired += (int)dbytes;          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- IFrame boost tax ratio:%.2f\n",
1297                  rc->curve_comp_error += dbytes - (int)dbytes;                          rc->pb_iboost_tax_ratio);
         }  
1298    
1299            /* Compute the average size of frames per frame type */
1300            for(i=0; i<3; i++) {
1301                    /* Special case for missing type or weird case */
1302                    if (rc->count[i] == 0 || rc->pb_iboost_tax_ratio == 0) {
1303                            rc->avg_length[i] = 1;
1304                    } else {
1305                            rc->avg_length[i] = rc->tot_scaled_length[i];
1306    
1307          /*                          if (i == (XVID_TYPE_IVOP-1)) {
1308           * 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 */
1309           * 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;  
1310          }else{          }else{
1311                  if (desired < rc->min_length[s->type-1]) {                                  /* P/B frames has to taxed */
1312                          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;  
1313                          }                          }
1314                          desired = rc->min_length[s->type-1];  
1315                            /* Finally compute the average frame size */
1316                            rc->avg_length[i] /= (double)rc->count[i];
1317                  }                  }
1318          }          }
1319    
1320          s->desired_length = desired;          /* Assymetric curve compression */
1321            if (rc->param.curve_compression_high || rc->param.curve_compression_low) {
1322                    double symetric_total;
1323                    double assymetric_delta_total;
1324    
1325                    /* Like I frame boosting, assymetric curve compression modifies the total
1326                     * amount of needed bits, we must compute the ratio so we can prescale
1327                     lengths */
1328                    symetric_total = 0;
1329                    assymetric_delta_total = 0;
1330                    for (i=0; i<rc->num_frames; i++) {
1331                            double assymetric_delta;
1332                            double dbytes;
1333                            twopass_stat_t * s = &rc->stats[i];
1334    
1335          /* if this keyframe is too close to the next, reduce it's byte allotment                          /* I Frames are not concerned by assymetric scaling */
1336             XXX: why do we do this after setting the desired length  */                          if (s->type == XVID_TYPE_IVOP)
1337                                    continue;
         if (s->type == XVID_TYPE_IVOP) {  
                 int KFdistance = rc->keyframe_locations[rc->KF_idx] - rc->keyframe_locations[rc->KF_idx - 1];  
   
                 if (KFdistance < rc->param.kftreshold) {  
   
                         KFdistance = KFdistance - rc->param.min_key_interval;  
   
                         if (KFdistance >= 0) {  
                                 int KF_min_size;  
1338    
1339                                  KF_min_size = desired * (100 - rc->param.kfreduction) / 100;                          /* During the real run, we would have to apply the iboost tax */
1340                                  if (KF_min_size < 1)                          dbytes = s->scaled_length * rc->pb_iboost_tax_ratio;
                                         KF_min_size = 1;  
1341    
1342                                  desired = KF_min_size + (desired - KF_min_size) * KFdistance /                          /* Update the symmetric curve compression total */
1343                                          (rc->param.kftreshold - rc->param.min_key_interval);                          symetric_total += dbytes;
1344    
1345                                  if (desired < 1)                          /* Apply assymetric curve compression */
1346                                          desired = 1;                          if (dbytes > rc->avg_length[s->type-1])
1347                          }                                  assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * (double)rc->param.curve_compression_high / 100.0f;
1348                  }                          else
1349          }                                  assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * (double)rc->param.curve_compression_low  / 100.0f;
1350    
1351          overflow = (int)((double)overflow * desired / rc->avg_length[XVID_TYPE_PVOP-1]);                          /* Cap to the minimum frame size if needed */
1352                            if (dbytes + assymetric_delta < rc->min_length[s->type-1])
1353                                    assymetric_delta = rc->min_length[s->type-1] - dbytes;
1354    
1355          /* Reign in overflow with huge frames */                          /* Accumulate after assymetric curve compression */
1356          if (labs(overflow) > labs(rc->overflow)) {                          assymetric_delta_total += assymetric_delta;
                 overflow = rc->overflow;  
1357          }          }
1358    
1359          /* Make sure overflow doesn't run away */                  /* Compute the tax that all p/b frames have to pay in order to respect the
1360          if (overflow > desired * rc->param.max_overflow_improvement / 100) {                   * bit distribution changes that the assymetric compression curve imposes
1361                  desired += (overflow <= desired) ? desired * rc->param.max_overflow_improvement / 100 :                   * We want assymetric_total = sum(0, n-1, tax.scaled_length)
1362                          overflow * rc->param.max_overflow_improvement / 100;                   *      ie assymetric_total = ratio.sum(0, n-1, scaled_length)
1363          } else if (overflow < desired * rc->param.max_overflow_degradation / -100){                   *         ratio = assymetric_total / symmetric_total */
1364                  desired += desired * rc->param.max_overflow_degradation / -100;                  rc->assymetric_tax_ratio = ((double)symetric_total - (double)assymetric_delta_total) / (double)symetric_total;
1365          } else {          } else {
1366                  desired += overflow;                  rc->assymetric_tax_ratio = 1.0f;
1367          }          }
1368    
1369          /* 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;  
                 DPRINTF(XVID_DEBUG_RC,"[%i] Capped to maximum frame size\n",  
                                 data->frame_num);  
         }  
1370    
1371          /* Make sure to not scale below the minimum framesize */          /* Last bits that need to be reset */
1372          if (desired < rc->min_length[s->type-1]) {          rc->overflow = 0;
1373                  desired = rc->min_length[s->type-1];          rc->KFoverflow = 0;
1374                  DPRINTF(XVID_DEBUG_RC,"[%i] Capped to minimum frame size\n",          rc->KFoverflow_partial = 0;
1375                                  data->frame_num);          rc->KF_idx = 0;
1376          }          rc->desired_total = 0;
1377            rc->real_total = 0;
1378    
1379            /* Job done */
1380            return;
1381    }
1382    
1383    /*****************************************************************************
1384     * Still more low level stuff (nothing to do with stats treatment)
1385     ****************************************************************************/
1386    
1387    /* This function returns an allocated string containing a complete line read
1388     * from the file starting at the current position */
1389    static char *
1390    readline(FILE *f)
1391    {
1392            char *buffer = NULL;
1393            int buffer_size = 0;
1394            int pos = 0;
1395    
1396          /*          do {
1397           * 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;  
1398    
1399          /* Let's clip the computed quantizer, if needed */                  /* Read a character from the stream */
1400          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) {  
1401    
1402                  /*                  /* Is that EOF or new line ? */
1403                   * The frame quantizer has not been clipped, this appear to be a good                  if(c == EOF || c == '\n')
1404                   * 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;  
1405    
1406                          if (rc->bquant_error[data->quant] >= 1.0) {                  /* Do we have to update buffer ? */
1407                                  rc->bquant_error[data->quant] -= 1.0;                  if(pos >= buffer_size - 1) {
1408                                  data->quant++;                          buffer_size += BUF_SZ;
1409                            buffer = (char*)realloc(buffer, buffer_size);
1410                            if (buffer == NULL)
1411                                    return(NULL);
1412                          }                          }
                 } else {  
                         rc->pquant_error[data->quant] += ((double)(s->quant * s->length) / desired) - data->quant;  
1413    
1414                          if (rc->pquant_error[data->quant] >= 1.0) {                  buffer[pos] = c;
1415                                  rc->pquant_error[data->quant] -= 1.0;                  pos++;
1416                                  ++data->quant;          } while(1);
                         }  
                 }  
         }  
1417    
1418          /*          /* Read \n or EOF */
1419           * Now we have a computed quant that is in the right quante range, with a          if (buffer == NULL) {
1420           * possible +1 correction due to cumulated error. We can now safely clip                  /* EOF, so we reached the end of the file, return NULL */
1421           * the quantizer again with user's quant ranges. "Safely" means the Rate                  if(feof(f))
1422           * Control could learn more about this quantizer, this knowledge is useful                          return(NULL);
1423           * for future frames even if it this quantizer won't be really used atm,  
1424           * that's why we don't perform this clipping earlier.                  /* Just an empty line with just a newline, allocate a 1 byte buffer to
1425           */                   * store a zero length string */
1426          if (data->quant < data->min_quant[s->type-1]) {                  buffer = (char*)malloc(1);
1427                  data->quant = data->min_quant[s->type-1];                  if(buffer == NULL)
1428          } else if (data->quant > data->max_quant[s->type-1]) {                          return(NULL);
                 data->quant = data->max_quant[s->type-1];  
1429          }          }
1430    
1431          /*          /* Zero terminated string */
1432           * 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) {  
1433    
1434                  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,  
                                         "[%i] p/b-frame quantizer prevented from rising too steeply\n",  
                                         data->frame_num);  
1435                  }                  }
1436                  if (data->quant < rc->last_quant[s->type-1] - 2) {  
1437                          data->quant = rc->last_quant[s->type-1] - 2;  /* This function returns a pointer to the first non space char in the given
1438                          DPRINTF(XVID_DEBUG_RC,   * string */
1439                                          "[%i] p/b-frame quantizer prevented from falling too steeply\n",  static char *
1440                                          data->frame_num);  skipspaces(char *string)
1441    {
1442            const char spaces[] =
1443                    {
1444                            ' ','\t','\0'
1445                    };
1446            const char *spacechar = spaces;
1447    
1448            if (string == NULL) return(NULL);
1449    
1450            while (*string != '\0') {
1451                    /* Test against space chars */
1452                    while (*spacechar != '\0') {
1453                            if (*string == *spacechar) {
1454                                    string++;
1455                                    spacechar = spaces;
1456                                    break;
1457                  }                  }
1458                            spacechar++;
1459          }          }
1460    
1461          /*                  /* No space char */
1462           * 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;  
1463          }          }
1464    
1465          return 0;          return(string);
1466  }  }
1467    
1468    /* This function returns a boolean that tells if the string is only a
1469     * comment */
1470  static int rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)  static int
1471    iscomment(char *string)
1472  {  {
1473      stat_t * s = &rc->stats[data->frame_num];          const char comments[] =
1474                    {
1475          /* Insufficent stats data */                          '#',';', '%', '\0'
1476      if (data->frame_num >= rc->num_frames)                  };
1477          return 0;          const char *cmtchar = comments;
1478            int iscomment = 0;
1479      rc->quant_count[data->quant]++;  
1480            if (string == NULL) return(1);
1481      if (data->type == XVID_TYPE_IVOP) {  
1482          int kfdiff = (rc->keyframe_locations[rc->KF_idx] -      rc->keyframe_locations[rc->KF_idx - 1]);          string = skipspaces(string);
1483    
1484          rc->overflow += rc->KFoverflow;          while(*cmtchar != '\0') {
1485          rc->KFoverflow = s->desired_length - data->length;                  if(*string == *cmtchar) {
1486                            iscomment = 1;
1487          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;  
1488          }          }
1489          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;  
1490      }      }
1491    
1492      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);  
1493  }  }
1494    
1495    #if 0
1496    static void
1497  int xvid_plugin_2pass2(void * handle, int opt, void * param1, void * param2)  stats_print(rc_2pass2_t * rc)
 {  
     switch(opt)  
1498      {      {
1499      case XVID_PLG_INFO :          int i;
1500          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);  
1501    
1502      case XVID_PLG_AFTER :          for (i=0; i<rc->num_frames; i++) {
1503          return rc_2pass2_after((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);                  twopass_stat_t *s = &rc->stats[i];
1504                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- frame:%d type:%c quant:%d stats:%d scaled:%d desired:%d actual:%d overflow(%c):%.2f\n",
1505                                    i, frame_type[s->type-1], -1, s->length, s->scaled_length,
1506                                    s->desired_length, -1, frame_type[s->type-1], -1.0f);
1507      }      }
   
     return XVID_ERR_FAIL;  
1508  }  }
1509    #endif
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