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revision 1040, Thu May 22 22:17:44 2003 UTC revision 1267, Wed Dec 17 15:16:16 2003 UTC
# Line 1  Line 1 
1  /******************************************************************************  /******************************************************************************
2   *   *
3   * XviD Bit Rate Controller Library   * XviD Bit Rate Controller Library
4   * - VBR 2 pass bitrate controler implementation -   *  - VBR 2 pass bitrate controller implementation -
5   *   *
6   * Copyright (C)      2002 Foxer <email?>   * Copyright (C)      2002 Foxer <email?>
7   *                    2002 Dirk Knop <dknop@gwdg.de>   *                    2002 Dirk Knop <dknop@gwdg.de>
# Line 25  Line 25 
25   * along with this program; if not, write to the Free Software   * along with this program; if not, write to the Free Software
26   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
27   *   *
28   * $Id: plugin_2pass2.c,v 1.1.2.9 2003-05-22 22:17:44 edgomez Exp $   * $Id: plugin_2pass2.c,v 1.1.2.31 2003-12-17 15:16:16 edgomez Exp $
29   *   *
30   *****************************************************************************/   *****************************************************************************/
31    
32    #define BQUANT_PRESCALE
33    #undef COMPENSATE_FORMULA
34    
35  #include <stdio.h>  #include <stdio.h>
36  #include <math.h>  #include <math.h>
37  #include <limits.h>  #include <limits.h>
38    
 #define RAD2DEG 57.295779513082320876798154814105  
 #define DEG2RAD 0.017453292519943295769236907684886  
   
39  #include "../xvid.h"  #include "../xvid.h"
40  #include "../image/image.h"  #include "../image/image.h"
41    
42    /*****************************************************************************
43     * Some default settings
44     ****************************************************************************/
45    
46    #define DEFAULT_KEYFRAME_BOOST 0
47    #define DEFAULT_OVERFLOW_CONTROL_STRENGTH 10
48    #define DEFAULT_CURVE_COMPRESSION_HIGH 0
49    #define DEFAULT_CURVE_COMPRESSION_LOW 0
50    #define DEFAULT_MAX_OVERFLOW_IMPROVEMENT 10
51    #define DEFAULT_MAX_OVERFLOW_DEGRADATION 10
52    
53    /* Keyframe settings */
54    #define DEFAULT_KFREDUCTION 20
55    #define DEFAULT_KFTHRESHOLD 1
56    
57    /*****************************************************************************
58     * Some default constants (can be tuned)
59     ****************************************************************************/
60    
61    /* Specify the invariant part of the headers bits (header+MV)
62     * as  hlength/cst */
63    #define INVARIANT_HEADER_PART_IVOP 1 /* factor 1.0f   */
64    #define INVARIANT_HEADER_PART_PVOP 2 /* factor 0.5f   */
65    #define INVARIANT_HEADER_PART_BVOP 8 /* factor 0.125f */
66    
67    /*****************************************************************************
68     * Structures
69     ****************************************************************************/
70    
71    /* Statistics */
72  typedef struct {  typedef struct {
73      int type;               /* first pass type */      int type;               /* first pass type */
74      int quant;              /* first pass quant */      int quant;              /* first pass quant */
75          int blks[3];                    /* k,m,y blks */          int blks[3];                    /* k,m,y blks */
76      int length;             /* first pass length */      int length;             /* first pass length */
77            int invariant;          /* what we assume as being invariant between the two passes, it's a sub part of header + MV bits */
78      int scaled_length;      /* scaled length */      int scaled_length;      /* scaled length */
79      int desired_length;     /* desired length; calcuated during encoding */          int desired_length;     /* desired length; calculated during encoding */
80            int error;
81    
82      int zone_mode;   /* XVID_ZONE_xxx */      int zone_mode;   /* XVID_ZONE_xxx */
83      double weight;      double weight;
84  } stat_t;  } twopass_stat_t;
   
85    
86    /* Context struct */
   
 /* context struct */  
87  typedef struct  typedef struct
88  {  {
89      xvid_plugin_2pass2_t param;      xvid_plugin_2pass2_t param;
90    
91      /* constant statistical data */          /*----------------------------------
92             * constant statistical data
93             *--------------------------------*/
94    
95            /* Number of frames of the sequence */
96          int num_frames;          int num_frames;
97    
98            /* Number of Intra frames of the sequence */
99      int num_keyframes;      int num_keyframes;
     uint64_t target;    /* target filesize */  
100    
101      int count[3];   /* count of each frame types */          /* Target filesize to reach */
102      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;  
103    
104      /* dynamic */          /* Count of each frame types */
105            int count[3];
106    
107      int * keyframe_locations;          /* Total length of each frame types (1st pass) */
108      stat_t * stats;          uint64_t tot_length[3];
109            uint64_t tot_invariant[3];
110    
111            /* Average length of each frame types (used first for 1st pass data and
112             * then for scaled averages */
113            double avg_length[3];
114    
115            /* Minimum frame length allowed for each frame type */
116            int min_length[3];
117    
118            /* Total bytes per frame type once the curve has been scaled
119             * NB: advanced parameters do not change this value. This field
120             *     represents the total scaled w/o any advanced settings */
121            uint64_t tot_scaled_length[3];
122    
123            /* Maximum observed frame size observed during the first pass, the RC
124             * will try tp force all frame sizes in the second pass to be under that
125             * limit */
126            int max_length;
127    
128      double pquant_error[32];          /*----------------------------------
129      double bquant_error[32];           * Zones statistical data
130      int quant_count[32];           *
131      int last_quant[3];           * ToDo: Fix zones, current
132             *       implementation is buggy
133             *--------------------------------*/
134    
135            /* Average weight of the zones */
136            double avg_weight;
137    
138            /* Total length used by XVID_ZONE_QUANT zones */
139            uint64_t tot_quant;
140            uint64_t tot_quant_invariant;
141    
142            /*----------------------------------
143             * Advanced settings helper ratios
144             *--------------------------------*/
145    
146            /* This the ratio that has to be applied to all p/b frames in order
147             * to reserve/retrieve bits for/from keyframe boosting and consecutive
148             * keyframe penalty */
149            double pb_iboost_tax_ratio;
150    
151            /* This the ratio to apply to all b/p frames in order to respect the
152             * assymetric curve compression while respecting a target filesize
153             * NB: The assymetric delta gain has to be computed before this ratio
154             *     is applied, and then the delta is added to the scaled size */
155            double assymetric_tax_ratio;
156    
157            /*----------------------------------
158             * Data from the stats file kept
159             * into RAM for easy access
160             *--------------------------------*/
161    
162            /* Array of keyframe locations
163             * eg: rc->keyframe_locations[100] returns the frame number of the 100th
164             *     keyframe */
165            int *keyframe_locations;
166    
167      double curve_comp_error;          /* Index of the last keyframe used in the keyframe_location */
     int overflow;  
     int KFoverflow;  
     int KFoverflow_partial;  
168      int KF_idx;      int KF_idx;
169    
170      double fq_error;          /* Array of all 1st pass data file -- see the twopass_stat_t structure
171  } rc_2pass2_t;           * definition for more details */
172            twopass_stat_t * stats;
173    
174            /*----------------------------------
175             * Histerysis helpers
176             *--------------------------------*/
177    
178            /* This field holds the int2float conversion errors of each quant per
179             * frame type, this allow the RC to keep track of rouding error and thus
180             * increase or decrease the chosen quant according to this residue */
181            double quant_error[3][32];
182    
183            /* This fields stores the count of each quant usage per frame type
184             * No real role but for debugging */
185            int quant_count[3][32];
186    
187            /* Last valid quantizer used per frame type, it allows quantizer
188             * increament/decreament limitation in order to avoid big image quality
189             * "jumps" */
190            int last_quant[3];
191    
192            /*----------------------------------
193             * Overflow control
194             *--------------------------------*/
195    
196            /* Current overflow that has to be distributed to p/b frames */
197            double overflow;
198    
199            /* Total overflow for keyframes -- not distributed directly */
200            double KFoverflow;
201    
202            /* Amount of keyframe overflow to introduce to the global p/b frame
203             * overflow counter at each encoded frame */
204            double KFoverflow_partial;
205    
206            /* Unknown ???
207             * ToDo: description */
208            double fq_error;
209    
210  #define BUF_SZ 1024          /*----------------------------------
211  #define MAX_COLS    5           * Debug
212             *--------------------------------*/
213            double desired_total;
214            double real_total;
215    } rc_2pass2_t;
216    
217    
218  /* open stats file, and count num frames */  /*****************************************************************************
219     * Sub plugin functions prototypes
220     ****************************************************************************/
221    
222    static int rc_2pass2_create(xvid_plg_create_t * create, rc_2pass2_t ** handle);
223    static int rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data);
224    static int rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data);
225    static int rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy);
226    
227    /*****************************************************************************
228     * Plugin definition
229     ****************************************************************************/
230    
231  static int det_stats_length(rc_2pass2_t * rc, char * filename)  int
232    xvid_plugin_2pass2(void * handle, int opt, void * param1, void * param2)
233  {  {
234      FILE * f;          switch(opt) {
235      int n, ignore;          case XVID_PLG_INFO :
236      char type;          case XVID_PLG_FRAME :
   
     rc->num_frames = 0;  
     rc->num_keyframes = 0;  
   
     if ((f = fopen(filename, "rt")) == NULL)  
237          return 0;          return 0;
238    
239      while((n = fscanf(f, "%c %d %d %d %d %d %d\n",          case XVID_PLG_CREATE :
240          &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++;  
         }  
     }  
241    
242      fclose(f);          case XVID_PLG_DESTROY :
243                    return rc_2pass2_destroy((rc_2pass2_t*)handle, (xvid_plg_destroy_t*)param1);
244    
245            case XVID_PLG_BEFORE :
246                    return rc_2pass2_before((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);
247    
248      return 1;          case XVID_PLG_AFTER :
249                    return rc_2pass2_after((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);
250  }  }
251    
252            return XVID_ERR_FAIL;
253    }
254    
255    /*****************************************************************************
256     * Sub plugin functions definitions
257     ****************************************************************************/
258    
259    /* First a few local helping function prototypes */
260    static  int statsfile_count_frames(rc_2pass2_t * rc, char * filename);
261    static  int statsfile_load(rc_2pass2_t *rc, char * filename);
262    static void zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create);
263    static void first_pass_stats_prepare_data(rc_2pass2_t * rc);
264    static void first_pass_scale_curve_internal(rc_2pass2_t *rc);
265    static void scaled_curve_apply_advanced_parameters(rc_2pass2_t * rc);
266    #if 0
267    static void stats_print(rc_2pass2_t * rc);
268    #endif
269    
270  /* open stats file(s) and read into rc->stats array */  /*----------------------------------------------------------------------------
271     *--------------------------------------------------------------------------*/
272    
273  static int load_stats(rc_2pass2_t *rc, char * filename)  static int
274    rc_2pass2_create(xvid_plg_create_t * create, rc_2pass2_t **handle)
275  {  {
276      FILE * f;          xvid_plugin_2pass2_t * param = (xvid_plugin_2pass2_t *)create->param;
277      int i, not_scaled;          rc_2pass2_t * rc;
278            int i;
279    
280            rc = malloc(sizeof(rc_2pass2_t));
281            if (rc == NULL)
282                    return XVID_ERR_MEMORY;
283    
284      if ((f = fopen(filename, "rt"))==NULL)          rc->param = *param;
         return 0;  
285    
286      i = 0;          /* Initialize all defaults */
287          not_scaled = 0;  #define _INIT(a, b) if((a) <= 0) (a) = (b)
288      while(i < rc->num_frames) {          /* Let's set our defaults if needed */
289          stat_t * s = &rc->stats[i];          _INIT(rc->param.keyframe_boost, DEFAULT_KEYFRAME_BOOST);
290          int n;          _INIT(rc->param.overflow_control_strength, DEFAULT_OVERFLOW_CONTROL_STRENGTH);
291          char type;          _INIT(rc->param.curve_compression_high, DEFAULT_CURVE_COMPRESSION_HIGH);
292            _INIT(rc->param.curve_compression_low, DEFAULT_CURVE_COMPRESSION_LOW);
293            _INIT(rc->param.max_overflow_improvement, DEFAULT_MAX_OVERFLOW_IMPROVEMENT);
294            _INIT(rc->param.max_overflow_degradation,  DEFAULT_MAX_OVERFLOW_DEGRADATION);
295    
296            /* Keyframe settings */
297            _INIT(rc->param.kfreduction, DEFAULT_KFREDUCTION);
298            _INIT(rc->param.kfthreshold, DEFAULT_KFTHRESHOLD);
299    #undef _INIT
300    
301                  s->scaled_length = 0;          /* Initialize some stuff to zero */
302          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++) {
303          if (n == EOF) break;                  int j;
304                  if (n < 7) {                  for (j=0; j<32; j++) {
305                          not_scaled = 1;                          rc->quant_error[i][j] = 0;
306                            rc->quant_count[i][j] = 0;
307                  }                  }
   
         if (type == 'i') {  
             s->type = XVID_TYPE_IVOP;  
         }else if (type == 'p' || type == 's') {  
             s->type = XVID_TYPE_PVOP;  
         }else if (type == 'b') {  
             s->type = XVID_TYPE_BVOP;  
         }else{  /* unknown type */  
             DPRINTF(XVID_DEBUG_RC, "unknown stats frame type; assuming pvop\n");  
             s->type = XVID_TYPE_PVOP;  
308          }          }
309    
310          i++;          for (i=0; i<3; i++) rc->last_quant[i] = 0;
311    
312            rc->fq_error = 0;
313    
314            /* Count frames (and intra frames) in the stats file, store the result into
315             * the rc structure */
316            if (statsfile_count_frames(rc, param->filename) == -1) {
317                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- ERROR: fopen %s failed\n", param->filename);
318                    free(rc);
319                    return(XVID_ERR_FAIL);
320      }      }
321    
322      rc->num_frames = i;          /* Allocate the stats' memory */
323            if ((rc->stats = malloc(rc->num_frames * sizeof(twopass_stat_t))) == NULL) {
324                    free(rc);
325                    return(XVID_ERR_MEMORY);
326            }
327    
328          fclose(f);          /* Allocate keyframes location's memory
329             * PS: see comment in pre_process0 for the +1 location requirement */
330            rc->keyframe_locations = malloc((rc->num_keyframes + 1) * sizeof(int));
331            if (rc->keyframe_locations == NULL) {
332                    free(rc->stats);
333                    free(rc);
334                    return(XVID_ERR_MEMORY);
335            }
336    
337      return 1;          /* Load the first pass stats */
338            if (statsfile_load(rc, param->filename) == -1) {
339                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- ERROR: fopen %s failed\n", param->filename);
340                    free(rc->keyframe_locations);
341                    free(rc->stats);
342                    free(rc);
343                    return XVID_ERR_FAIL;
344  }  }
345    
346            /* Compute the target filesize */
347            if (rc->param.bitrate<0) {
348                    /* if negative, bitrate equals the target (in kbytes) */
349                    rc->target = ((uint64_t)(-rc->param.bitrate)) * 1024;
350            } else if (rc->num_frames  < create->fbase/create->fincr) {
351                    /* Source sequence is less than 1s long, we do as if it was 1s long */
352                    rc->target = rc->param.bitrate / 8;
353            } else {
354                    /* Target filesize = bitrate/8 * numframes / framerate */
355                    rc->target =
356                            ((uint64_t)rc->param.bitrate * (uint64_t)rc->num_frames * \
357                             (uint64_t)create->fincr) / \
358                            ((uint64_t)create->fbase * 8);
359            }
360    
361            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Frame rate: %d/%d (%ffps)\n",
362                            create->fbase, create->fincr,
363                            (double)create->fbase/(double)create->fincr);
364            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Number of frames: %d\n", rc->num_frames);
365            if(rc->param.bitrate>=0)
366                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Target bitrate: %ld\n", rc->param.bitrate);
367            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Target filesize: %lld\n", rc->target);
368    
369            /* Compensate the average frame overhead caused by the container */
370            rc->target -= rc->num_frames*rc->param.container_frame_overhead;
371            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Container Frame overhead: %d\n", rc->param.container_frame_overhead);
372            if(rc->param.container_frame_overhead)
373                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- New target filesize after container compensation: %lld\n", rc->target);
374    
375            /* Gathers some information about first pass stats:
376             *  - finds the minimum frame length for each frame type during 1st pass.
377             *     rc->min_size[]
378             *  - determines the maximum frame length observed (no frame type distinction).
379             *     rc->max_size
380             *  - count how many times each frame type has been used.
381             *     rc->count[]
382             *  - total bytes used per frame type
383             *     rc->tot_length[]
384             *  - total bytes considered invariant between the 2 passes
385             *  - store keyframe location
386             *     rc->keyframe_locations[]
387             */
388            first_pass_stats_prepare_data(rc);
389    
390  #if 0          /* When bitrate is not given it means it has been scaled by an external
391  static void print_stats(rc_2pass2_t * rc)           * application */
392  {          if (rc->param.bitrate) {
393      int i;                  /* Apply zone settings
394      DPRINTF(XVID_DEBUG_RC, "type quant length scaled_length\n");                   * - set rc->tot_quant which represents the total num of bytes spent in
395                     *   fixed quant zones
396                     * - set rc->tot_quant_invariant which represents the total num of bytes spent
397                     *   in fixed quant zones for headers */
398                    zone_process(rc, create);
399                    /* Perform internal curve scaling */
400                    first_pass_scale_curve_internal(rc);
401            } else {
402                    /* External scaling -- zones are ignored */
403          for (i = 0; i < rc->num_frames; i++) {          for (i = 0; i < rc->num_frames; i++) {
404          stat_t * s = &rc->stats[i];                          rc->stats[i].zone_mode = XVID_ZONE_WEIGHT;
405          DPRINTF(XVID_DEBUG_RC, "%d %d %d %d\n", s->type, s->quant, s->length, s->scaled_length);                          rc->stats[i].weight = 1.0;
406      }      }
407                    rc->avg_weight = 1.0;
408                    rc->tot_quant = 0;
409  }  }
 #endif  
410    
411  /* pre-process the statistics data          /* Apply advanced curve options, and compute some parameters in order to
412      - for each type, count, tot_length, min_length, max_length           * shape the curve in the BEFORE/AFTER pair of functions */
413      - set keyframes_locations          scaled_curve_apply_advanced_parameters(rc);
 */  
   
 static void  
 pre_process0(rc_2pass2_t * rc)  
 {  
     int i,j;  
414    
415      for (i=0; i<3; i++) {          *handle = rc;
416          rc->count[i]=0;          return(0);
         rc->tot_length[i] = 0;  
         rc->last_quant[i] = 0;  
                 rc->min_length[i] = INT_MAX;  
417      }      }
418    
419          rc->max_length = INT_MIN;  /*----------------------------------------------------------------------------
420     *--------------------------------------------------------------------------*/
     for (i=j=0; i<rc->num_frames; i++) {  
         stat_t * s = &rc->stats[i];  
421    
422          rc->count[s->type-1]++;  static int
423          rc->tot_length[s->type-1] += s->length;  rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy)
424    {
425            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- target_total:%lld desired_total:%.2f (%.2f%%) actual_total:%.2f (%.2f%%)\n",
426                            rc->target,
427                            rc->desired_total,
428                            100*rc->desired_total/(double)rc->target,
429                            rc->real_total,
430                            100*rc->real_total/(double)rc->target);
431    
432          if (s->length < rc->min_length[s->type-1]) {          free(rc->keyframe_locations);
433              rc->min_length[s->type-1] = s->length;          free(rc->stats);
434            free(rc);
435            return(0);
436          }          }
437    
438          if (s->length > rc->max_length) {  /*----------------------------------------------------------------------------
439              rc->max_length = s->length;   *--------------------------------------------------------------------------*/
         }  
440    
441          if (s->type == XVID_TYPE_IVOP) {  static int
442              rc->keyframe_locations[j] = i;  rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)
443              j++;  {
444          }          twopass_stat_t * s = &rc->stats[data->frame_num];
445      }          double dbytes;
446            double scaled_quant;
447            double overflow;
448            int capped_to_max_framesize = 0;
449    
450          /*          /* This function is quite long but easy to understand. In order to simplify
451           * The "per sequence" overflow system considers a natural sequence to be           * the code path (a bit), we treat 3 cases that can return immediatly. */
452           * formed by all frames between two iframes, so if we want to make sure  
453           * the system does not go nuts during last sequence, we force the last          /* First case: Another plugin has already set a quantizer */
454           * frame to appear in the keyframe locations array.          if (data->quant > 0)
455           */                  return(0);
     rc->keyframe_locations[j] = i;  
456    
457          DPRINTF(XVID_DEBUG_RC, "Min 1st pass IFrame length: %d\n", rc->min_length[0]);          /* Second case: insufficent stats data */
458          DPRINTF(XVID_DEBUG_RC, "Min 1st pass PFrame length: %d\n", rc->min_length[1]);          if (data->frame_num >= rc->num_frames) {
459          DPRINTF(XVID_DEBUG_RC, "Min 1st pass BFrame length: %d\n", rc->min_length[2]);                  DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- stats file too short (now processing frame %d)",
460                            data->frame_num);
461                    return(0);
462  }  }
463    
464            /* Third case: We are in a Quant zone */
465            if (s->zone_mode == XVID_ZONE_QUANT) {
466                    rc->fq_error += s->weight;
467                    data->quant = (int)rc->fq_error;
468                    rc->fq_error -= data->quant;
469    
470  /* calculate zone weight "center" */                  s->desired_length = s->length;
471    
472  static void                  return(0);
473  zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)          }
 {  
     int i,j;  
     int n = 0;  
474    
     rc->avg_weight = 0.0;  
     rc->tot_quant = 0;  
475    
476            /*************************************************************************/
477            /*************************************************************************/
478            /*************************************************************************/
479    
480      if (create->num_zones == 0) {          /*-------------------------------------------------------------------------
481          for (j = 0; j < rc->num_frames; j++) {           * Frame bit allocation first part
482              rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;           *
483              rc->stats[j].weight = 1.0;           * First steps apply user settings, just like it is done in the theoritical
484          }           * scaled_curve_apply_advanced_parameters
485          rc->avg_weight += rc->num_frames * 1.0;           *-----------------------------------------------------------------------*/
         n += rc->num_frames;  
     }  
486    
487            /* Set desired to what we are wanting to obtain for this frame */
488            dbytes = (double)s->scaled_length;
489    
490      for(i=0; i < create->num_zones; i++) {          /* IFrame user settings*/
491            if (s->type == XVID_TYPE_IVOP) {
492                    /* Keyframe boosting -- All keyframes benefit from it */
493                    dbytes += dbytes*rc->param.keyframe_boost / 100;
494    
495          int next = (i+1<create->num_zones) ? create->zones[i+1].frame : rc->num_frames;  #if 0 /* ToDo: decide how to apply kfthresholding */
496    #endif
497            } else {
498    
499          if (i==0 && create->zones[i].frame > 0) {                  /* P/S/B frames must reserve some bits for iframe boosting */
500              for (j = 0; j < create->zones[i].frame && j < rc->num_frames; j++) {                  dbytes *= rc->pb_iboost_tax_ratio;
                 rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;  
                 rc->stats[j].weight = 1.0;  
             }  
             rc->avg_weight += create->zones[i].frame * 1.0;  
             n += create->zones[i].frame;  
         }  
501    
502          if (create->zones[i].mode == XVID_ZONE_WEIGHT) {                  /* Apply assymetric curve compression */
503              for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {                  if (rc->param.curve_compression_high || rc->param.curve_compression_low) {
504                  rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;                          double assymetric_delta;
505                  rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;  
506              }                          /* Compute the assymetric delta, this is computed before applying
507              next -= create->zones[i].frame;                           * the tax, as done in the pre_process function */
508              rc->avg_weight += (double)(next * create->zones[i].increment) / (double)create->zones[i].base;                          if (dbytes > rc->avg_length[s->type-1])
509              n += next;                                  assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_high / 100.0;
510          }else{  // XVID_ZONE_QUANT                          else
511              for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {                                  assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_low  / 100.0;
512                  rc->stats[j].zone_mode = XVID_ZONE_QUANT;  
513                  rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;                          /* Now we must apply the assymetric tax, else our curve compression
514                  rc->tot_quant += rc->stats[j].length;                           * would not give a theoritical target size equal to what it is
515              }                           * expected */
516                            dbytes *= rc->assymetric_tax_ratio;
517    
518                            /* Now we can add the assymetric delta */
519                            dbytes += assymetric_delta;
520          }          }
521      }      }
     rc->avg_weight = n>0 ? rc->avg_weight/n : 1.0;  
   
     DPRINTF(XVID_DEBUG_RC, "center_weight: %f (for %i frames);   fixed_bytes: %i\n", rc->avg_weight, n, rc->tot_quant);  
 }  
   
522    
523  /* scale the curve */          /* That is what we would like to have -- Don't put that chunk after
524             * overflow control, otherwise, overflow is counted twice and you obtain
525             * half sized bitrate sequences */
526            s->desired_length  = (int)dbytes;
527            rc->desired_total += dbytes;
528    
529  static void          /*------------------------------------------------------------------------
530  internal_scale(rc_2pass2_t *rc)           * Frame bit allocation: overflow control part.
531  {           *
532          int64_t target  = rc->target - rc->tot_quant;           * Unlike the theoritical scaled_curve_apply_advanced_parameters, here
533          int64_t pass1_length = rc->tot_length[0] + rc->tot_length[1] + rc->tot_length[2] - rc->tot_quant;           * it's real encoding and we need to make sure we don't go so far from
534          int min_size[3];           * what is our ideal scaled curve.
535          double scaler;           *-----------------------------------------------------------------------*/
         int i;  
536    
537            /* Compute the overflow we should compensate */
538            if (s->type != XVID_TYPE_IVOP) {
539                    double frametype_factor;
540                    double framesize_factor;
541    
542          /*                  /* Take only the desired part of overflow */
543           * Perform an initial scale pass.                  overflow = rc->overflow;
          * if a frame size is scaled underneath our hardcoded minimums, then we  
          * force the frame size to the minimum, and deduct the original & scaled  
          * frame length from the original and target total lengths  
          */  
544    
545          min_size[0] = ((rc->stats[0].blks[0]*22) + 240) / 8;                  /* Factor that will take care to decrease the overflow applied
546          min_size[1] = (rc->stats[0].blks[0] + 88) / 8;                   * according to the importance of this frame type in term of
547          min_size[2] = 8;                   * overall size */
548                    frametype_factor  = rc->count[XVID_TYPE_IVOP-1]*rc->avg_length[XVID_TYPE_IVOP-1];
549                    frametype_factor += rc->count[XVID_TYPE_PVOP-1]*rc->avg_length[XVID_TYPE_PVOP-1];
550                    frametype_factor += rc->count[XVID_TYPE_BVOP-1]*rc->avg_length[XVID_TYPE_BVOP-1];
551                    frametype_factor /= rc->count[s->type-1]*rc->avg_length[s->type-1];
552                    frametype_factor  = 1/frametype_factor;
553    
554                    /* Factor that will take care not to compensate too much for this frame
555                     * size */
556                    framesize_factor  = dbytes;
557                    framesize_factor /= rc->avg_length[s->type-1];
558    
559          scaler = (double)target / (double)pass1_length;                  /* Treat only the overflow part concerned by this frame type and size */
560                    overflow *= frametype_factor;
561    #if 0
562                    /* Leave this one alone, as it impacts badly on quality */
563                    overflow *= framesize_factor;
564    #endif
565    
566          if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {                  /* Apply the overflow strength imposed by the user */
567                  DPRINTF(XVID_DEBUG_RC, "undersize warning\n");                  overflow *= (rc->param.overflow_control_strength/100.0f);
568          scaler = 1.0;          } else {
569                    /* no overflow applied in IFrames because:
570                     *  - their role is important as they're references for P/BFrames.
571                     *  - there aren't much in typical sequences, so if an IFrame overflows too
572                     *    much, this overflow may impact the next IFrame too much and generate
573                     *    a sequence of poor quality frames */
574                    overflow = 0;
575          }          }
576    
577      DPRINTF(XVID_DEBUG_RC,          /* Make sure we are not trying to compensate more overflow than we even have */
578                          "Before any correction: target=%i, tot_length=%i, scaler=%f\n",          if (fabs(overflow) > fabs(rc->overflow))
579                          (int)target, (int)pass1_length, scaler);                  overflow = rc->overflow;
   
         for (i=0; i<rc->num_frames; i++) {  
                 stat_t * s = &rc->stats[i];  
                 int len;  
580    
581          if (s->zone_mode == XVID_ZONE_QUANT) {          /* Make sure the overflow doesn't make the frame size to get out of the range
582              s->scaled_length = s->length;           * [-max_degradation..+max_improvment] */
583          }else {          if (overflow > dbytes*rc->param.max_overflow_improvement / 100) {
584                      len = (int)((double)s->length * scaler * s->weight / rc->avg_weight);                  if(overflow <= dbytes)
585                      if (len < min_size[s->type-1]) {            /* force frame size */                          dbytes += dbytes * rc->param.max_overflow_improvement / 100;
586                              s->scaled_length = min_size[s->type-1];                  else
587                              target -= s->scaled_length;                          dbytes += overflow * rc->param.max_overflow_improvement / 100;
588                              pass1_length -= s->length;          } else if (overflow < - dbytes * rc->param.max_overflow_degradation / 100) {
589                    dbytes -= dbytes * rc->param.max_overflow_degradation / 100;
590                      }else{                      }else{
591                              s->scaled_length = 0;                  dbytes += overflow;
                     }  
         }  
592          }          }
593    
594      scaler = (double)target / (double)pass1_length;          /*-------------------------------------------------------------------------
595      if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {           * Frame bit allocation last part:
596                  DPRINTF(XVID_DEBUG_RC,"undersize warning\n");           *
597                  scaler = 1.0;           * Cap frame length so we don't reach neither bigger frame sizes than first
598             * pass nor smaller than the allowed minimum.
599             *-----------------------------------------------------------------------*/
600    
601            if (dbytes > s->length) {
602                    dbytes = s->length;
603            } else if (dbytes < rc->min_length[s->type-1]) {
604                    dbytes = rc->min_length[s->type-1];
605            } else if (dbytes > rc->max_length) {
606                    /* ToDo: this condition is always wrong as max_length == maximum frame
607                     * length of first pass, so the first condition already caps the frame
608                     * size... */
609                    capped_to_max_framesize = 1;
610                    dbytes = rc->max_length;
611                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- frame:%d Capped to maximum frame size\n",
612                                    data->frame_num);
613          }          }
614    
615          DPRINTF(XVID_DEBUG_RC,          /*------------------------------------------------------------------------
616                          "After correction: target=%i, tot_length=%i, scaler=%f\n",           * Desired frame length <-> quantizer mapping
617                          (int)target, (int)pass1_length, scaler);           *-----------------------------------------------------------------------*/
   
         for (i=0; i<rc->num_frames; i++) {  
                 stat_t * s = &rc->stats[i];  
   
                 if (s->scaled_length==0) {      /* ignore frame with forced frame sizes */  
                         s->scaled_length = (int)((double)s->length * scaler * s->weight / rc->avg_weight);  
                 }  
         }  
 }  
618    
619    #ifdef BQUANT_PRESCALE
620            /* For bframes we prescale the quantizer to avoid too high quant scaling */
621            if(s->type == XVID_TYPE_BVOP) {
622    
623                    twopass_stat_t *b_ref = s;
624    
625                    /* Find the reference frame */
626                    while(b_ref != &rc->stats[0] && b_ref->type == XVID_TYPE_BVOP)
627                            b_ref--;
628    
629                    /* Compute the original quant */
630                    s->quant  = 2*(100*s->quant - data->bquant_offset);
631                    s->quant += data->bquant_ratio - 1; /* to avoid rounding issues */
632                    s->quant  = s->quant/data->bquant_ratio - b_ref->quant;
633            }
634    #endif
635    
636  static void          /* Don't laugh at this very 'simple' quant<->size relationship, it
637  pre_process1(rc_2pass2_t * rc)           * proves to be acurate enough for our algorithm */
638  {          scaled_quant = (double)s->quant*(double)s->length/(double)dbytes;
639      int i;  
640      double total1, total2;  #ifdef COMPENSATE_FORMULA
641      uint64_t ivop_boost_total;          /* We know xvidcore will apply the bframe formula again, so we compensate
642             * it right now to make sure we would not apply it twice */
643            if(s->type == XVID_TYPE_BVOP) {
644    
645      ivop_boost_total = 0;                  twopass_stat_t *b_ref = s;
     rc->curve_comp_error = 0;  
646    
647      for (i=0; i<3; i++) {                  /* Find the reference frame */
648          rc->tot_scaled_length[i] = 0;                  while(b_ref != &rc->stats[0] && b_ref->type == XVID_TYPE_BVOP)
649                            b_ref--;
650    
651                    /* Compute the quant it would be if the core did not apply the bframe
652                     * formula */
653                    scaled_quant  = 100*scaled_quant - data->bquant_offset;
654                    scaled_quant += data->bquant_ratio - 1; /* to avoid rouding issues */
655                    scaled_quant /= data->bquant_ratio;
656      }      }
657    #endif
658    
659      for (i=0; i<rc->num_frames; i++) {          /* Quantizer has been scaled using floating point operations/results, we
660          stat_t * s = &rc->stats[i];           * must cast it to integer */
661            data->quant = (int)scaled_quant;
662    
663          rc->tot_scaled_length[s->type-1] += s->scaled_length;          /* Let's clip the computed quantizer, if needed */
664            if (data->quant < 1) {
665                    data->quant = 1;
666            } else if (data->quant > 31) {
667                    data->quant = 31;
668            } else {
669    
670          if (s->type == XVID_TYPE_IVOP) {                  /* The frame quantizer has not been clipped, this appears to be a good
671              ivop_boost_total += s->scaled_length * rc->param.keyframe_boost / 100;                   * computed quantizer, do not loose quantizer decimal part that we
672                     * accumulate for later reuse when its sum represents a complete
673                     * unit. */
674                    rc->quant_error[s->type-1][data->quant] += scaled_quant - (double)data->quant;
675    
676                    if (rc->quant_error[s->type-1][data->quant] >= 1.0) {
677                            rc->quant_error[s->type-1][data->quant] -= 1.0;
678                            data->quant++;
679                    } else if (rc->quant_error[s->type-1][data->quant] <= -1.0) {
680                            rc->quant_error[s->type-1][data->quant] += 1.0;
681                            data->quant--;
682          }          }
683      }      }
684    
685      rc->movie_curve = ((double)(rc->tot_scaled_length[XVID_TYPE_PVOP-1] + rc->tot_scaled_length[XVID_TYPE_BVOP-1] + ivop_boost_total) /          /* Now we have a computed quant that is in the right quante range, with a
686                                          (rc->tot_scaled_length[XVID_TYPE_PVOP-1] + rc->tot_scaled_length[XVID_TYPE_BVOP-1]));           * possible +1 correction due to cumulated error. We can now safely clip
687             * the quantizer again with user's quant ranges. "Safely" means the Rate
688      for(i=0; i<3; i++) {           * Control could learn more about this quantizer, this knowledge is useful
689          if (rc->count[i] == 0 || rc->movie_curve == 0) {           * for future frames even if it this quantizer won't be really used atm,
690              rc->avg_length[i] = 1;           * that's why we don't perform this clipping earlier. */
691          }else{          if (data->quant < data->min_quant[s->type-1]) {
692              rc->avg_length[i] = rc->tot_scaled_length[i] / rc->count[i] / rc->movie_curve;                  data->quant = data->min_quant[s->type-1];
693          }          } else if (data->quant > data->max_quant[s->type-1]) {
694                    data->quant = data->max_quant[s->type-1];
695      }      }
696    
697      /* alt curve stuff here */          /* To avoid big quality jumps from frame to frame, we apply a "security"
698             * rule that makes |last_quant - new_quant| <= 2. This rule only applies
699      if (rc->param.use_alt_curve) {           * to predicted frames (P and B) */
700          const double avg_pvop = rc->avg_length[XVID_TYPE_PVOP-1];          if (s->type != XVID_TYPE_IVOP && rc->last_quant[s->type-1] && capped_to_max_framesize == 0) {
         const uint64_t tot_pvop = rc->tot_length[XVID_TYPE_PVOP-1];  
         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];  
   
                 rc->alt_curve_low = avg_pvop - avg_pvop * (double)rc->param.alt_curve_low_dist / 100.0;  
                 rc->alt_curve_low_diff = avg_pvop - rc->alt_curve_low;  
                 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;  
   
         if (rc->param.alt_curve_use_auto) {  
             if (tot_bvop + tot_pvop > tot_scaled_bvop + tot_scaled_pvop) {  
                                 rc->param.alt_curve_min_rel_qual = (int)(100.0 - (100.0 - 100.0 /  
                                         ((double)(tot_pvop + tot_bvop) / (double)(tot_scaled_pvop + tot_scaled_bvop))) * (double)rc->param.alt_curve_auto_str / 100.0);  
   
                                 if (rc->param.alt_curve_min_rel_qual < 20)  
                                         rc->param.alt_curve_min_rel_qual = 20;  
             }else{  
                                 rc->param.alt_curve_min_rel_qual = 100;  
             }  
         }  
                 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;  
701    
702          if (rc->param.alt_curve_low_dist > 100) {                  if (data->quant > rc->last_quant[s->type-1] + 2) {
703                          switch(rc->param.alt_curve_type) {                          data->quant = rc->last_quant[s->type-1] + 2;
704              case XVID_CURVE_SINE: // Sine Curve (high aggressiveness)                          DPRINTF(XVID_DEBUG_RC,
705                                  rc->alt_curve_qual_dev *= 2.0 / (1.0 + sin(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff)));                                          "[xvid rc] -- frame %d p/b-frame quantizer prevented from rising too steeply\n",
706                                  rc->alt_curve_mid_qual = 1.0 - rc->alt_curve_qual_dev * sin(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff));                                          data->frame_num);
                                 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)));  
707                          }                          }
708                    if (data->quant < rc->last_quant[s->type-1] - 2) {
709                            data->quant = rc->last_quant[s->type-1] - 2;
710                            DPRINTF(XVID_DEBUG_RC,
711                                            "[xvid rc] -- frame:%d p/b-frame quantizer prevented from falling too steeply\n",
712                                            data->frame_num);
713                  }                  }
714      }      }
     /* --- */  
   
   
     total1=total2=0;  
     for (i=0; i<rc->num_frames; i++) {  
         stat_t * s = &rc->stats[i];  
   
         if (s->type != XVID_TYPE_IVOP) {  
             double dbytes,dbytes2;  
715    
716              dbytes = s->scaled_length / rc->movie_curve;          /* We don't want to pollute the RC histerisis when our computed quant has
717              dbytes2 = 0; /* XXX: warning */           * been computed from a capped frame size */
718              total1 += dbytes;          if (capped_to_max_framesize == 0)
719              if (s->type == XVID_TYPE_BVOP)                  rc->last_quant[s->type-1] = data->quant;
                 dbytes *= rc->avg_length[XVID_TYPE_PVOP-1] / rc->avg_length[XVID_TYPE_BVOP-1];  
720    
721              if (rc->param.use_alt_curve) {          /* Don't forget to force 1st pass frame type ;-) */
722                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {          data->type = s->type;
723    
724                      if (dbytes >= rc->alt_curve_high) {          return 0;
                                                 dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev);  
                     }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_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))));  
                                                 }  
725                                          }                                          }
726    
727                  }  /*----------------------------------------------------------------------------
728     *--------------------------------------------------------------------------*/
729    
730    static int
731    rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)
732    {
733            const char frame_type[4] = { 'i', 'p', 'b', 's'};
734            twopass_stat_t * s = &rc->stats[data->frame_num];
735    
736              }else{          /* Insufficent stats data */
737                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {          if (data->frame_num >= rc->num_frames)
738                      dbytes2=((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_high / 100.0);                  return 0;
                 }else{  
                                 dbytes2 = ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_low / 100.0);  
                 }  
             }  
739    
740              if (s->type == XVID_TYPE_BVOP) {          /* Update the quantizer counter */
741                              dbytes2 *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];          rc->quant_count[s->type-1][data->quant]++;
                             if (dbytes2 < rc->min_length[XVID_TYPE_BVOP-1])  
                                     dbytes2 = rc->min_length[XVID_TYPE_BVOP-1];  
             }else{  
                             if (dbytes2 < rc->min_length[XVID_TYPE_PVOP-1])  
                                     dbytes2 = rc->min_length[XVID_TYPE_PVOP-1];  
             }  
             total2 += dbytes2;  
         }  
     }  
742    
743      rc->curve_comp_scale = total1 / total2;          /* Update the frame type overflow */
744            if (data->type == XVID_TYPE_IVOP) {
745                    int kfdiff = 0;
746    
747      if (!rc->param.use_alt_curve) {                  if(rc->KF_idx != rc->num_frames -1) {
748          DPRINTF(XVID_DEBUG_RC, "middle frame size for asymmetric curve compression: %i\n",                          kfdiff  = rc->keyframe_locations[rc->KF_idx+1];
749              (int)(rc->avg_length[XVID_TYPE_PVOP-1] * rc->curve_comp_scale));                          kfdiff -= rc->keyframe_locations[rc->KF_idx];
750      }      }
751    
752      if (rc->param.use_alt_curve) {                  /* Flush Keyframe overflow accumulator */
753          int bonus_bias = rc->param.alt_curve_bonus_bias;                  rc->overflow += rc->KFoverflow;
         int oldquant = 1;  
   
             if (rc->param.alt_curve_use_auto_bonus_bias)  
                     bonus_bias = rc->param.alt_curve_min_rel_qual;  
   
             rc->alt_curve_curve_bias_bonus = (total1 - total2) * (double)bonus_bias / 100.0 / (double)(rc->num_frames /* - credits_frames */ - rc->num_keyframes);  
             rc->curve_comp_scale = ((total1 - total2) * (1.0 - (double)bonus_bias / 100.0) + total2) / total2;  
   
   
         /* special info for alt curve:  bias bonus and quantizer thresholds */  
   
                 DPRINTF(XVID_DEBUG_RC, "avg scaled framesize:%i\n", (int)rc->avg_length[XVID_TYPE_PVOP-1]);  
                 DPRINTF(XVID_DEBUG_RC, "bias bonus:%i bytes\n", (int)rc->alt_curve_curve_bias_bonus);  
754    
755                  for (i=1; i <= (int)(rc->alt_curve_high*2)+1; i++) {                  /* Store the frame overflow to the keyframe accumulator */
756              double curve_temp, dbytes;                  rc->KFoverflow = s->desired_length - data->length;
             int newquant;  
757    
758              dbytes = i;                  if (kfdiff > 1) {
759                          if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                          /* Non-consecutive keyframes case:
760                  if (dbytes >= rc->alt_curve_high) {                           * We can then divide this total keyframe overflow into equal parts
761                                          curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev);                           * that we will distribute into regular overflow at each frame
762                             * between the sequence bounded by two IFrames */
763                            rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);
764                  }else{                  }else{
765                                          switch(rc->param.alt_curve_type)                          /* Consecutive keyframes case:
766                                          {                           * Flush immediatly the keyframe overflow and reset keyframe
767                                          case XVID_CURVE_SINE :                           * overflow */
768                                                  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)));                          rc->overflow += rc->KFoverflow;
769                                                  break;                          rc->KFoverflow = 0;
770                                          case XVID_CURVE_LINEAR :                          rc->KFoverflow_partial = 0;
                                                 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))));  
                                         }  
771                                  }                                  }
772                    rc->KF_idx++;
773                          }else{                          }else{
774                  if (dbytes <= rc->alt_curve_low) {                  /* Accumulate the frame overflow */
775                                          curve_temp = dbytes;                  rc->overflow += s->desired_length - data->length;
                 }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))));  
                                         }  
                                 }  
                         }  
776    
777                          if (rc->movie_curve > 1.0)                  /* Distribute part of the keyframe overflow */
778                                  dbytes *= rc->movie_curve;                  rc->overflow += rc->KFoverflow_partial;
779    
780                          newquant = (int)(dbytes * 2.0 / (curve_temp * rc->curve_comp_scale + rc->alt_curve_curve_bias_bonus));                  /* Don't forget to substract that same amount from the total keyframe
781                          if (newquant > 1) {                   * overflow */
782                                  if (newquant != oldquant) {                  rc->KFoverflow -= rc->KFoverflow_partial;
                     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);  
                                 }  
                         }  
783                  }                  }
784    
785      }          rc->overflow += (s->error = s->desired_length - data->length);
786            rc->real_total += data->length;
787    
788      rc->overflow = 0;          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",
789      rc->KFoverflow = 0;                          data->frame_num,
790      rc->KFoverflow_partial = 0;                          frame_type[data->type-1],
791      rc->KF_idx = 1;                          data->quant,
792  }                          s->length,
793                            s->scaled_length,
794                            s->desired_length,
795                            s->desired_length - s->error,
796                            -s->error,
797                            rc->overflow);
798    
799            return(0);
800    }
801    
802    /*****************************************************************************
803     * Helper functions definition
804     ****************************************************************************/
805    
806    /* Default buffer size for reading lines */
807    #define BUF_SZ   1024
808    
809  static int rc_2pass2_create(xvid_plg_create_t * create, rc_2pass2_t ** handle)  /* Helper functions for reading/parsing the stats file */
810    static char *skipspaces(char *string);
811    static int iscomment(char *string);
812    static char *readline(FILE *f);
813    
814    /* This function counts the number of frame entries in the stats file
815     * It also counts the number of I Frames */
816    static int
817    statsfile_count_frames(rc_2pass2_t * rc, char * filename)
818  {  {
819      xvid_plugin_2pass2_t * param = (xvid_plugin_2pass2_t *)create->param;          FILE * f;
820      rc_2pass2_t * rc;          char *line;
821      int i;          int lines;
822    
823      rc = malloc(sizeof(rc_2pass2_t));          rc->num_frames = 0;
824      if (rc == NULL)          rc->num_keyframes = 0;
         return XVID_ERR_MEMORY;  
825    
826      rc->param = *param;          if ((f = fopen(filename, "rb")) == NULL)
827                    return(-1);
828    
829      if (rc->param.keyframe_boost <= 0) rc->param.keyframe_boost = 0;          lines = 0;
830      if (rc->param.payback_method <= 0) rc->param.payback_method = XVID_PAYBACK_PROP;          while ((line = readline(f)) != NULL) {
     if (rc->param.bitrate_payback_delay <= 0) rc->param.bitrate_payback_delay = 250;  
     if (rc->param.curve_compression_high <= 0) rc->param.curve_compression_high = 0;  
     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;  
831    
832      if (!det_stats_length(rc, param->filename)){                  char *ptr;
833          DPRINTF(XVID_DEBUG_RC,"fopen %s failed\n", param->filename);                  char type;
834          free(rc);                  int fields;
         return XVID_ERR_FAIL;  
     }  
835    
836      if ((rc->stats = malloc(rc->num_frames * sizeof(stat_t))) == NULL) {                  lines++;
         free(rc);  
         return XVID_ERR_MEMORY;  
     }  
837    
838      /*                  /* We skip spaces */
839           * We need an extra location because we do as if the last frame were an                  ptr = skipspaces(line);
          * 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;  
     }  
840    
841      if (!load_stats(rc, param->filename)) {                  /* Skip coment lines or empty lines */
842          DPRINTF(XVID_DEBUG_RC,"fopen %s failed\n", param->filename);                  if(iscomment(ptr) || *ptr == '\0') {
843          free(rc->keyframe_locations);                          free(line);
844          free(rc->stats);                          continue;
         free(rc);  
         return XVID_ERR_FAIL;  
845      }      }
846    
847      /* pre-process our stats */                  /* Read the stat line from buffer */
848                    fields = sscanf(ptr, "%c", &type);
849    
850          if (rc->num_frames  < create->fbase/create->fincr) {                  /* Valid stats files have at least 7 fields */
851                  rc->target = rc->param.bitrate / 8;     /* one second */                  if (fields == 1) {
852          }else{                          switch(type) {
853                  rc->target =                          case 'i':
854                          ((uint64_t)rc->param.bitrate * (uint64_t)rc->num_frames * (uint64_t)create->fincr) / \                          case 'I':
855                          ((uint64_t)create->fbase * 8);                                  rc->num_keyframes++;
856                            case 'p':
857                            case 'P':
858                            case 'b':
859                            case 'B':
860                            case 's':
861                            case 'S':
862                                    rc->num_frames++;
863                                    break;
864                            default:
865                                    DPRINTF(XVID_DEBUG_RC,
866                                                    "[xvid rc] -- WARNING: L%d unknown frame type used (%c).\n",
867                                                    lines, type);
868          }          }
   
     DPRINTF(XVID_DEBUG_RC, "Number of frames: %d\n", rc->num_frames);  
         DPRINTF(XVID_DEBUG_RC, "Frame rate: %d/%d\n", create->fbase, create->fincr);  
         DPRINTF(XVID_DEBUG_RC, "Target bitrate: %ld\n", rc->param.bitrate);  
         DPRINTF(XVID_DEBUG_RC, "Target filesize: %lld\n", rc->target);  
   
 #if 0  
         rc->target -= rc->num_frames*24;        /* avi file header */  
 #endif  
   
   
         pre_process0(rc);  
   
         if (rc->param.bitrate) {  
         zone_process(rc, create);  
                 internal_scale(rc);  
869      }else{      }else{
870          /* external scaler: ignore zone */                                  DPRINTF(XVID_DEBUG_RC,
871          for (i=0;i<rc->num_frames;i++) {                                                  "[xvid rc] -- WARNING: L%d misses some stat fields (%d).\n",
872              rc->stats[i].zone_mode = XVID_ZONE_WEIGHT;                                                  lines, 7-fields);
             rc->stats[i].weight = 1.0;  
         }  
         rc->avg_weight = 1.0;  
         rc->tot_quant = 0;  
873      }      }
         pre_process1(rc);  
874    
875      for (i=0; i<32;i++) {                  /* Free the line buffer */
876          rc->pquant_error[i] = 0;                  free(line);
         rc->bquant_error[i] = 0;  
         rc->quant_count[i] = 0;  
877      }      }
878    
879      rc->fq_error = 0;          /* We are done with the file */
880            fclose(f);
881    
     *handle = rc;  
882          return(0);          return(0);
883  }  }
884    
885    /* open stats file(s) and read into rc->stats array */
886  static int rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy)  static int
887    statsfile_load(rc_2pass2_t *rc, char * filename)
888  {  {
889      free(rc->keyframe_locations);          FILE * f;
890      free(rc->stats);          int processed_entries;
         free(rc);  
         return(0);  
 }  
891    
892            /* Opens the file */
893            if ((f = fopen(filename, "rb"))==NULL)
894                    return(-1);
895    
896            processed_entries = 0;
897            while(processed_entries < rc->num_frames) {
898                    char type;
899                    int fields;
900                    twopass_stat_t * s = &rc->stats[processed_entries];
901                    char *line, *ptr;
902    
903  static int rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)                  /* Read the line from the file */
904  {                  if((line = readline(f)) == NULL)
905      stat_t * s = &rc->stats[data->frame_num];                          break;
     int overflow;  
     int desired;  
     double dbytes;  
     double curve_temp;  
     int capped_to_max_framesize = 0;  
906    
907          /*                  /* We skip spaces */
908           * This function is quite long but easy to understand. In order to simplify                  ptr = skipspaces(line);
          * the code path (a bit), we treat 3 cases that can return immediatly.  
          */  
909    
910          /* First case: Another plugin has already set a quantizer */                  /* Skip comment lines or empty lines */
911      if (data->quant > 0)                  if(iscomment(ptr) || *ptr == '\0') {
912                  return(0);                          free(line);
913                            continue;
914                    }
915    
916          /* Second case: We are in a Quant zone */                  /* Reset this field that is optional */
917          if (s->zone_mode == XVID_ZONE_QUANT) {                  s->scaled_length = 0;
918    
919                  rc->fq_error += s->weight;                  /* Convert the fields */
920                  data->quant = (int)rc->fq_error;                  fields = sscanf(ptr,
921                  rc->fq_error -= data->quant;                                                  "%c %d %d %d %d %d %d %d\n",
922                                                    &type,
923                                                    &s->quant,
924                                                    &s->blks[0], &s->blks[1], &s->blks[2],
925                                                    &s->length, &s->invariant /* not really yet */,
926                                                    &s->scaled_length);
927    
928                    /* Free line buffer, we don't need it anymore */
929                    free(line);
930    
931                    /* Fail silently, this has probably been warned in
932                     * statsfile_count_frames */
933                    if(fields != 7 && fields != 8)
934                            continue;
935    
936                    /* Convert frame type and compute the invariant length part */
937                    switch(type) {
938                    case 'i':
939                    case 'I':
940                            s->type = XVID_TYPE_IVOP;
941                            s->invariant /= INVARIANT_HEADER_PART_IVOP;
942                            break;
943                    case 'p':
944                    case 'P':
945                    case 's':
946                    case 'S':
947                            s->type = XVID_TYPE_PVOP;
948                            s->invariant /= INVARIANT_HEADER_PART_PVOP;
949                            break;
950                    case 'b':
951                    case 'B':
952                            s->type = XVID_TYPE_BVOP;
953                            s->invariant /= INVARIANT_HEADER_PART_BVOP;
954                            break;
955                    default:
956                            /* Same as before, fail silently */
957                            continue;
958                    }
959    
960                  s->desired_length = s->length;                  /* Ok it seems it's been processed correctly */
961                    processed_entries++;
962            }
963    
964            /* Close the file */
965            fclose(f);
966    
967                  return(0);                  return(0);
968    }
969    
970    /* pre-process the statistics data
971     * - for each type, count, tot_length, min_length, max_length
972     * - set keyframes_locations */
973    static void
974    first_pass_stats_prepare_data(rc_2pass2_t * rc)
975    {
976            int i,j;
977    
978            /* *rc fields initialization
979             * NB: INT_MAX and INT_MIN are used in order to be immediately replaced
980             *     with real values of the 1pass */
981            for (i=0; i<3; i++) {
982                    rc->count[i]=0;
983                    rc->tot_length[i] = 0;
984                    rc->tot_invariant[i] = 0;
985                    rc->min_length[i] = INT_MAX;
986          }          }
987    
988          /* Third case: insufficent stats data */          rc->max_length = INT_MIN;
         if (data->frame_num >= rc->num_frames)  
                 return 0;  
989    
990          /*          /* Loop through all frames and find/compute all the stuff this function
991           * The last case is the one every normal minded developer should fear to           * is supposed to do */
992           * maintain in a project :-)          for (i=j=0; i<rc->num_frames; i++) {
993           */                  twopass_stat_t * s = &rc->stats[i];
994    
995          /* XXX: why by 8 */                  rc->count[s->type-1]++;
996          overflow = rc->overflow / 8;                  rc->tot_length[s->type-1] += s->length;
997                    rc->tot_invariant[s->type-1] += s->invariant;
998    
999          /*                  if (s->length < rc->min_length[s->type-1]) {
1000           * The rc->overflow field represents the overflow in current scene (between two                          rc->min_length[s->type-1] = s->length;
          * IFrames) so we must not forget to reset it if we are enetring a new scene  
          */  
         if (s->type == XVID_TYPE_IVOP) {  
                 overflow = 0;  
1001          }          }
1002    
1003          desired = s->scaled_length;                  if (s->length > rc->max_length) {
1004                            rc->max_length = s->length;
1005                    }
1006    
         dbytes = desired;  
1007          if (s->type == XVID_TYPE_IVOP) {          if (s->type == XVID_TYPE_IVOP) {
1008                  dbytes += desired * rc->param.keyframe_boost / 100;                          rc->keyframe_locations[j] = i;
1009                            j++;
1010                    }
1011          }          }
         dbytes /= rc->movie_curve;  
1012    
1013          /*          /* NB:
1014           * We are now entering in the hard part of the algo, it was first designed           * The "per sequence" overflow system considers a natural sequence to be
1015           * to work with i/pframes only streams, so the way it computes things is           * formed by all frames between two iframes, so if we want to make sure
1016           * adapted to pframes only. However we can use it if we just take care to           * the system does not go nuts during last sequence, we force the last
1017           * scale the bframes sizes to pframes sizes using the ratio avg_p/avg_p and           * frame to appear in the keyframe locations array. */
1018           * then before really using values depending on frame sizes, scaling the          rc->keyframe_locations[j] = i;
1019           * value again with the inverse ratio  
1020           */          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Min 1st pass IFrame length: %d\n", rc->min_length[0]);
1021          if (s->type == XVID_TYPE_BVOP) {          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Min 1st pass PFrame length: %d\n", rc->min_length[1]);
1022                  dbytes *= rc->avg_length[XVID_TYPE_PVOP-1] / rc->avg_length[XVID_TYPE_BVOP-1];          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Min 1st pass BFrame length: %d\n", rc->min_length[2]);
1023          }          }
1024    
1025          /*  /* calculate zone weight "center" */
1026           * Apply user's choosen Payback method. Payback helps bitrate to follow the  static void
1027           * scaled curve "paying back" past errors in curve previsions.  zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)
1028           */  {
1029          if (rc->param.payback_method == XVID_PAYBACK_BIAS) {          int i,j;
1030                  desired =(int)(rc->curve_comp_error / rc->param.bitrate_payback_delay);          int n = 0;
1031          }else{  
1032                  desired = (int)(rc->curve_comp_error * dbytes /          rc->avg_weight = 0.0;
1033                                                  rc->avg_length[XVID_TYPE_PVOP-1] / rc->param.bitrate_payback_delay);          rc->tot_quant = 0;
1034            rc->tot_quant_invariant = 0;
1035    
1036                  if (labs(desired) > fabs(rc->curve_comp_error)) {          if (create->num_zones == 0) {
1037                          desired = (int)rc->curve_comp_error;                  for (j = 0; j < rc->num_frames; j++) {
1038                            rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1039                            rc->stats[j].weight = 1.0;
1040                  }                  }
1041                    rc->avg_weight += rc->num_frames * 1.0;
1042                    n += rc->num_frames;
1043          }          }
1044    
         rc->curve_comp_error -= desired;  
1045    
1046          /*          for(i=0; i < create->num_zones; i++) {
          * Alt curve treatment is not that hard to understand though the formulas  
          * seem to be huge. Alt treatment is basically a way to soft/harden the  
          * curve flux applying sine/linear/cosine ratios  
          */  
1047    
1048          /* XXX: warning */                  int next = (i+1<create->num_zones) ? create->zones[i+1].frame : rc->num_frames;
         curve_temp = 0;  
1049    
1050          if (rc->param.use_alt_curve) {                  if (i==0 && create->zones[i].frame > 0) {
1051                  if (s->type != XVID_TYPE_IVOP)  {                          for (j = 0; j < create->zones[i].frame && j < rc->num_frames; j++) {
1052                          if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                                  rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1053                                  if (dbytes >= rc->alt_curve_high) {                                  rc->stats[j].weight = 1.0;
                                         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))));  
1054                                          }                                          }
1055                            rc->avg_weight += create->zones[i].frame * 1.0;
1056                            n += create->zones[i].frame;
1057                                  }                                  }
1058                          } else {  
1059                                  if (dbytes <= rc->alt_curve_low){                  if (create->zones[i].mode == XVID_ZONE_WEIGHT) {
1060                                          curve_temp = dbytes;                          for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {
1061                                  } else {                                  rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1062                                          switch(rc->param.alt_curve_type) {                                  rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;
                                         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))));  
1063                                          }                                          }
1064                            next -= create->zones[i].frame;
1065                            rc->avg_weight += (double)(next * create->zones[i].increment) / (double)create->zones[i].base;
1066                            n += next;
1067                    } else{  /* XVID_ZONE_QUANT */
1068                            for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {
1069                                    rc->stats[j].zone_mode = XVID_ZONE_QUANT;
1070                                    rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;
1071                                    rc->tot_quant += rc->stats[j].length;
1072                                    rc->tot_quant_invariant += rc->stats[j].invariant;
1073                                  }                                  }
1074                          }                          }
1075            }
1076            rc->avg_weight = n>0 ? rc->avg_weight/n : 1.0;
1077    
1078                          /*          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- center_weight:%f (for %d frames)  fixed_bytes:%d\n", rc->avg_weight, n, rc->tot_quant);
1079                           * End of code path for curve_temp, 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)  
                                 curve_temp *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
1080    
                         curve_temp = curve_temp * rc->curve_comp_scale + rc->alt_curve_curve_bias_bonus;  
1081    
1082                          desired += ((int)curve_temp);  /* scale the curve */
1083                          rc->curve_comp_error += curve_temp - (int)curve_temp;  static void
1084                  } else {  first_pass_scale_curve_internal(rc_2pass2_t *rc)
1085                          /*  {
1086                           * End of code path for dbytes, as told earlier, we are now          int64_t target;
1087                           * obliged to scale the value to a bframe one using the inverse          int64_t pass1_length;
1088                           * ratio applied earlier          int64_t total_invariant;
1089                           */          double scaler;
1090                          if (s->type == XVID_TYPE_BVOP)          int i, num_MBs;
                                 dbytes *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
1091    
1092                          desired += ((int)dbytes);          /* We only scale texture data ! */
1093                          rc->curve_comp_error += dbytes - (int)dbytes;          total_invariant  = rc->tot_invariant[XVID_TYPE_IVOP-1];
1094            total_invariant += rc->tot_invariant[XVID_TYPE_PVOP-1];
1095            total_invariant += rc->tot_invariant[XVID_TYPE_BVOP-1];
1096            /* don't forget to substract header bytes used in quant zones, otherwise we
1097             * counting them twice */
1098            total_invariant -= rc->tot_quant_invariant;
1099    
1100            /* We remove the bytes used by the fixed quantizer zones during first pass
1101             * with the same quants, so we know very precisely how much that
1102             * represents */
1103            target  = rc->target;
1104            target -= rc->tot_quant;
1105    
1106            /* Do the same for the first pass data */
1107            pass1_length  = rc->tot_length[XVID_TYPE_IVOP-1];
1108            pass1_length += rc->tot_length[XVID_TYPE_PVOP-1];
1109            pass1_length += rc->tot_length[XVID_TYPE_BVOP-1];
1110            pass1_length -= rc->tot_quant;
1111    
1112            /* Let's compute a linear scaler in order to perform curve scaling */
1113            scaler = (double)(target - total_invariant) / (double)(pass1_length - total_invariant);
1114    
1115            if ((target - total_invariant) <= 0 ||
1116                    (pass1_length - total_invariant) <= 0 ||
1117                    target >= pass1_length) {
1118                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- WARNING: Undersize detected before correction\n");
1119                    scaler = 1.0;
1120                  }                  }
1121    
1122          } else if ((rc->param.curve_compression_high + rc->param.curve_compression_low) &&      s->type != XVID_TYPE_IVOP) {          /* Compute min frame lengths (for each frame type) according to the number
1123             * of MBs. We sum all block type counters of frame 0, this gives us the
1124             * number of MBs.
1125             *
1126             * We compare these hardcoded values with observed values in first pass
1127             * (determined in pre_process0).Then we keep the real minimum. */
1128    
1129                  curve_temp = rc->curve_comp_scale;          /* Number of MBs */
1130                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {          num_MBs  = rc->stats[0].blks[0];
1131                          curve_temp *= ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_high / 100.0);          num_MBs += rc->stats[0].blks[1];
1132                  } else {          num_MBs += rc->stats[0].blks[2];
1133                          curve_temp *= ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_low / 100.0);  
1134                  }          /* Minimum for I frames */
1135            if(rc->min_length[XVID_TYPE_IVOP-1] > ((num_MBs*22) + 240) / 8)
1136                    rc->min_length[XVID_TYPE_IVOP-1] = ((num_MBs*22) + 240) / 8;
1137    
1138            /* Minimum for P/S frames */
1139            if(rc->min_length[XVID_TYPE_PVOP-1] > ((num_MBs) + 88)  / 8)
1140                    rc->min_length[XVID_TYPE_PVOP-1] = ((num_MBs) + 88)  / 8;
1141    
1142            /* Minimum for B frames */
1143            if(rc->min_length[XVID_TYPE_BVOP-1] > 8)
1144                    rc->min_length[XVID_TYPE_BVOP-1] = 8;
1145    
1146                  /*          /* Perform an initial scale pass.
1147                   * End of code path for curve_temp, as told earlier, we are now           *
1148                   * obliged to scale the value to a bframe one using the inverse           * If a frame size is scaled underneath our hardcoded minimums, then we
1149                   * ratio applied earlier           * force the frame size to the minimum, and deduct the original & scaled
1150                   */           * frame length from the original and target total lengths */
1151                  if (s->type == XVID_TYPE_BVOP)          for (i=0; i<rc->num_frames; i++) {
1152                          curve_temp *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];                  twopass_stat_t * s = &rc->stats[i];
1153                    int len;
1154    
1155                  desired += (int)curve_temp;                  /* No need to scale frame length for which a specific quantizer is
1156                  rc->curve_comp_error += curve_temp - (int)curve_temp;                   * specified thanks to zones */
1157          } else {                  if (s->zone_mode == XVID_ZONE_QUANT) {
1158                  /*                          s->scaled_length = s->length;
1159                   * End of code path for dbytes, as told earlier, we are now                          continue;
                  * 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];  
1160                  }                  }
1161    
1162                  desired += (int)dbytes;                  /* Compute the scaled length -- only non invariant data length is scaled */
1163                  rc->curve_comp_error += dbytes - (int)dbytes;                  len = s->invariant + (int)((double)(s->length-s->invariant) * scaler * s->weight / rc->avg_weight);
         }  
1164    
1165                    /* Compare with the computed minimum */
1166                    if (len < rc->min_length[s->type-1]) {
1167                            /* This is a 'forced size' frame, set its frame size to the
1168                             * computed minimum */
1169                            s->scaled_length = rc->min_length[s->type-1];
1170    
1171          /*                          /* Remove both scaled and original size from their respective
1172           * We can't do bigger frames than first pass, this would be stupid as first                           * total counters, as we prepare a second pass for 'regular'
1173           * pass is quant=2 and that reaching quant=1 is not worth it. We would lose                           * frames */
1174           * many bytes and we would not not gain much quality.                          target -= s->scaled_length;
1175           */                          pass1_length -= s->length;
         if (desired > s->length) {  
                 rc->curve_comp_error += desired - s->length;  
                 desired = s->length;  
1176          }else{          }else{
1177                  if (desired < rc->min_length[s->type-1]) {                          /* Do nothing for now, we'll scale this later */
1178                          if (s->type == XVID_TYPE_IVOP){                          s->scaled_length = 0;
                                 rc->curve_comp_error -= rc->min_length[XVID_TYPE_IVOP-1] - desired;  
                         }  
                         desired = rc->min_length[s->type-1];  
1179                  }                  }
1180          }          }
1181    
1182          s->desired_length = desired;          /* The first pass on data substracted all 'forced size' frames from the
1183             * total counters. Now, it's possible to scale the 'regular' frames. */
1184    
1185          /* if this keyframe is too close to the next, reduce it's byte allotment          /* Scaling factor for 'regular' frames */
1186             XXX: why do we do this after setting the desired length  */          scaler = (double)(target - total_invariant) / (double)(pass1_length - total_invariant);
1187    
1188          if (s->type == XVID_TYPE_IVOP) {          /* Detect undersizing */
1189                  int KFdistance = rc->keyframe_locations[rc->KF_idx] - rc->keyframe_locations[rc->KF_idx - 1];          if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {
1190                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- WARNING: Undersize detected after correction\n");
1191                    scaler = 1.0;
1192            }
1193    
1194                  if (KFdistance < rc->param.kftreshold) {          /* Do another pass with the new scaler */
1195            for (i=0; i<rc->num_frames; i++) {
1196                    twopass_stat_t * s = &rc->stats[i];
1197    
1198                          KFdistance = KFdistance - rc->param.min_key_interval;                  /* Ignore frame with forced frame sizes */
1199                    if (s->scaled_length == 0)
1200                            s->scaled_length = s->invariant + (int)((double)(s->length-s->invariant) * scaler * s->weight / rc->avg_weight);
1201            }
1202    
1203                          if (KFdistance >= 0) {          /* Job done */
1204                                  int KF_min_size;          return;
1205    }
1206    
1207                                  KF_min_size = desired * (100 - rc->param.kfreduction) / 100;  /* Apply all user settings to the scaled curve
1208                                  if (KF_min_size < 1)   * This implies:
1209                                          KF_min_size = 1;   *   keyframe boosting
1210     *   high/low compression */
1211    static void
1212    scaled_curve_apply_advanced_parameters(rc_2pass2_t * rc)
1213    {
1214            int i;
1215            int64_t ivop_boost_total;
1216    
1217                                  desired = KF_min_size + (desired - KF_min_size) * KFdistance /          /* Reset the rate controller (per frame type) total byte counters */
1218                                          (rc->param.kftreshold - rc->param.min_key_interval);          for (i=0; i<3; i++) rc->tot_scaled_length[i] = 0;
1219    
1220                                  if (desired < 1)          /* Compute total bytes for each frame type */
1221                                          desired = 1;          for (i=0; i<rc->num_frames;i++) {
1222                          }                  twopass_stat_t *s = &rc->stats[i];
1223                  }                  rc->tot_scaled_length[s->type-1] += s->scaled_length;
1224          }          }
1225    
1226          overflow = (int)((double)overflow * desired / rc->avg_length[XVID_TYPE_PVOP-1]);          /* First we compute the total amount of bits needed, as being described by
1227             * the scaled distribution. During this pass over the complete stats data,
1228             * we see how much bits two user settings will get/give from/to p&b frames:
1229             *  - keyframe boosting
1230             *  - keyframe distance penalty */
1231            rc->KF_idx = 0;
1232            ivop_boost_total = 0;
1233            for (i=0; i<rc->num_frames; i++) {
1234                    twopass_stat_t * s = &rc->stats[i];
1235    
1236          /* Reign in overflow with huge frames */                  /* Some more work is needed for I frames */
1237          if (labs(overflow) > labs(rc->overflow)) {                  if (s->type == XVID_TYPE_IVOP) {
1238                  overflow = rc->overflow;                          int ivop_boost;
         }  
1239    
1240          /* Make sure overflow doesn't run away */                          /* Accumulate bytes needed for keyframe boosting */
1241          if (overflow > desired * rc->param.max_overflow_improvement / 100) {                          ivop_boost = s->scaled_length*rc->param.keyframe_boost/100;
                 desired += (overflow <= desired) ? desired * rc->param.max_overflow_improvement / 100 :  
                         overflow * rc->param.max_overflow_improvement / 100;  
         } else if (overflow < desired * rc->param.max_overflow_degradation / -100){  
                 desired += desired * rc->param.max_overflow_degradation / -100;  
         } else {  
                 desired += overflow;  
         }  
1242    
1243          /* Make sure we are not higher than desired frame size */  #if 0 /* ToDo: decide how to apply kfthresholding */
1244          if (desired > rc->max_length) {  #endif
1245                  capped_to_max_framesize = 1;                          /* If the frame size drops under the minimum length, then cap ivop_boost */
1246                  desired = rc->max_length;                          if (ivop_boost + s->scaled_length < rc->min_length[XVID_TYPE_IVOP-1])
1247                  DPRINTF(XVID_DEBUG_RC,"[%i] Capped to maximum frame size\n",                                  ivop_boost = rc->min_length[XVID_TYPE_IVOP-1] - s->scaled_length;
                                 data->frame_num);  
         }  
1248    
1249          /* Make sure to not scale below the minimum framesize */                          /* Accumulate the ivop boost */
1250          if (desired < rc->min_length[s->type-1]) {                          ivop_boost_total += ivop_boost;
1251                  desired = rc->min_length[s->type-1];  
1252                  DPRINTF(XVID_DEBUG_RC,"[%i] Capped to minimum frame size\n",                          /* Don't forget to update the keyframe index */
1253                                  data->frame_num);                          rc->KF_idx++;
1254                    }
1255          }          }
1256    
1257          /*          /* Initialize the IBoost tax ratio for P/S/B frames
1258           * Don't laugh at this very 'simple' quant<->filesize relationship, it           *
1259           * proves to be acurate enough for our algorithm           * This ratio has to be applied to p/b/s frames in order to reserve
1260           */           * additional bits for keyframes (keyframe boosting) or if too much
1261          data->quant= (s->quant * s->length) / desired;           * keyframe distance is applied, bits retrieved from the keyframes.
1262             *
1263             * ie pb_length *= rc->pb_iboost_tax_ratio;
1264             *
1265             *    gives the ideal length of a p/b frame */
1266    
1267          /* Let's clip the computed quantizer, if needed */          /* Compute the total length of p/b/s frames (temporary storage into
1268          if (data->quant < 1) {           * movie_curve) */
1269                  data->quant = 1;          rc->pb_iboost_tax_ratio  = (double)rc->tot_scaled_length[XVID_TYPE_PVOP-1];
1270          } else if (data->quant > 31) {          rc->pb_iboost_tax_ratio += (double)rc->tot_scaled_length[XVID_TYPE_BVOP-1];
1271                  data->quant = 31;  
1272          } else if (s->type != XVID_TYPE_IVOP) {          /* Compute the ratio described above
1273             *     taxed_total = sum(0, n, tax*scaled_length)
1274             * <=> taxed_total = tax.sum(0, n, scaled_length)
1275             * <=> tax = taxed_total / original_total */
1276            rc->pb_iboost_tax_ratio =
1277                    (rc->pb_iboost_tax_ratio - ivop_boost_total) /
1278                    rc->pb_iboost_tax_ratio;
1279    
1280                  /*          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- IFrame boost tax ratio:%.2f\n",
1281                   * The frame quantizer has not been clipped, this appear to be a good                          rc->pb_iboost_tax_ratio);
                  * computed quantizer, however past frames give us some info about how  
                  * this quantizer performs against the algo prevision. Let's use this  
                  * prevision to increase the quantizer when we observe a too big  
                  * accumulated error  
                  */  
                 if (s->type== XVID_TYPE_BVOP) {  
                         rc->bquant_error[data->quant] += ((double)(s->quant * s->length) / desired) - data->quant;  
1282    
1283                          if (rc->bquant_error[data->quant] >= 1.0) {          /* Compute the average size of frames per frame type */
1284                                  rc->bquant_error[data->quant] -= 1.0;          for(i=0; i<3; i++) {
1285                                  data->quant++;                  /* Special case for missing type or weird case */
1286                          }                  if (rc->count[i] == 0 || rc->pb_iboost_tax_ratio == 0) {
1287                            rc->avg_length[i] = 1;
1288                  } else {                  } else {
1289                          rc->pquant_error[data->quant] += ((double)(s->quant * s->length) / desired) - data->quant;                          rc->avg_length[i] = rc->tot_scaled_length[i];
1290    
1291                          if (rc->pquant_error[data->quant] >= 1.0) {                          if (i == (XVID_TYPE_IVOP-1)) {
1292                                  rc->pquant_error[data->quant] -= 1.0;                                  /* I Frames total has to be added the boost total */
1293                                  ++data->quant;                                  rc->avg_length[i] += ivop_boost_total;
1294                            } else {
1295                                    /* P/B frames has to taxed */
1296                                    rc->avg_length[i] *= rc->pb_iboost_tax_ratio;
1297                          }                          }
1298    
1299                            /* Finally compute the average frame size */
1300                            rc->avg_length[i] /= (double)rc->count[i];
1301                  }                  }
1302          }          }
1303    
1304          /*          /* Assymetric curve compression */
1305           * Now we have a computed quant that is in the right quante range, with a          if (rc->param.curve_compression_high || rc->param.curve_compression_low) {
1306           * possible +1 correction due to cumulated error. We can now safely clip                  double symetric_total;
1307           * the quantizer again with user's quant ranges. "Safely" means the Rate                  double assymetric_delta_total;
          * Control could learn more about this quantizer, this knowledge is useful  
          * for future frames even if it this quantizer won't be really used atm,  
          * that's why we don't perform this clipping earlier.  
          */  
         if (data->quant < data->min_quant[s->type-1]) {  
                 data->quant = data->min_quant[s->type-1];  
         } else if (data->quant > data->max_quant[s->type-1]) {  
                 data->quant = data->max_quant[s->type-1];  
         }  
1308    
1309          /*                  /* Like I frame boosting, assymetric curve compression modifies the total
1310           * To avoid big quality jumps from frame to frame, we apply a "security"                   * amount of needed bits, we must compute the ratio so we can prescale
1311           * rule that makes |last_quant - new_quant| <= 2. This rule only applies                   lengths */
1312           * to predicted frames (P and B)                  symetric_total = 0;
1313           */                  assymetric_delta_total = 0;
1314          if (s->type != XVID_TYPE_IVOP && rc->last_quant[s->type-1] && capped_to_max_framesize == 0) {                  for (i=0; i<rc->num_frames; i++) {
1315                            double assymetric_delta;
1316                            double dbytes;
1317                            twopass_stat_t * s = &rc->stats[i];
1318    
1319                  if (data->quant > rc->last_quant[s->type-1] + 2) {                          /* I Frames are not concerned by assymetric scaling */
1320                          data->quant = rc->last_quant[s->type-1] + 2;                          if (s->type == XVID_TYPE_IVOP)
1321                          DPRINTF(XVID_DEBUG_RC,                                  continue;
                                         "[%i] p/b-frame quantizer prevented from rising too steeply\n",  
                                         data->frame_num);  
                 }  
                 if (data->quant < rc->last_quant[s->type-1] - 2) {  
                         data->quant = rc->last_quant[s->type-1] - 2;  
                         DPRINTF(XVID_DEBUG_RC,  
                                         "[%i] p/b-frame quantizer prevented from falling too steeply\n",  
                                         data->frame_num);  
                 }  
         }  
1322    
1323          /*                          /* During the real run, we would have to apply the iboost tax */
1324           * We don't want to pollute the RC history results when our computed quant                          dbytes = s->scaled_length * rc->pb_iboost_tax_ratio;
          * has been computed from a capped frame size  
          */  
         if (capped_to_max_framesize == 0) {  
                 rc->last_quant[s->type-1] = data->quant;  
         }  
1325    
1326          return 0;                          /* Update the symmetric curve compression total */
1327                            symetric_total += dbytes;
1328    
1329                            /* Apply assymetric curve compression */
1330                            if (dbytes > rc->avg_length[s->type-1])
1331                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * (double)rc->param.curve_compression_high / 100.0f;
1332                            else
1333                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * (double)rc->param.curve_compression_low  / 100.0f;
1334    
1335                            /* Cap to the minimum frame size if needed */
1336                            if (dbytes + assymetric_delta < rc->min_length[s->type-1])
1337                                    assymetric_delta = rc->min_length[s->type-1] - dbytes;
1338    
1339                            /* Accumulate after assymetric curve compression */
1340                            assymetric_delta_total += assymetric_delta;
1341  }  }
1342    
1343                    /* Compute the tax that all p/b frames have to pay in order to respect the
1344                     * bit distribution changes that the assymetric compression curve imposes
1345                     * We want assymetric_total = sum(0, n-1, tax.scaled_length)
1346                     *      ie assymetric_total = ratio.sum(0, n-1, scaled_length)
1347                     *         ratio = assymetric_total / symmetric_total */
1348                    rc->assymetric_tax_ratio = ((double)symetric_total - (double)assymetric_delta_total) / (double)symetric_total;
1349            } else {
1350                    rc->assymetric_tax_ratio = 1.0f;
1351            }
1352    
1353            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Assymetric tax ratio:%.2f\n", rc->assymetric_tax_ratio);
1354    
1355  static int rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)          /* Last bits that need to be reset */
1356            rc->overflow = 0;
1357            rc->KFoverflow = 0;
1358            rc->KFoverflow_partial = 0;
1359            rc->KF_idx = 0;
1360            rc->desired_total = 0;
1361            rc->real_total = 0;
1362    
1363            /* Job done */
1364            return;
1365    }
1366    
1367    /*****************************************************************************
1368     * Still more low level stuff (nothing to do with stats treatment)
1369     ****************************************************************************/
1370    
1371    /* This function returns an allocated string containing a complete line read
1372     * from the file starting at the current position */
1373    static char *
1374    readline(FILE *f)
1375  {  {
1376      stat_t * s = &rc->stats[data->frame_num];          char *buffer = NULL;
1377            int buffer_size = 0;
1378            int pos = 0;
1379    
1380          /* Insufficent stats data */          do {
1381      if (data->frame_num >= rc->num_frames)                  int c;
         return 0;  
1382    
1383      rc->quant_count[data->quant]++;                  /* Read a character from the stream */
1384                    c = fgetc(f);
1385    
1386      if (data->type == XVID_TYPE_IVOP) {                  /* Is that EOF or new line ? */
1387          int kfdiff = (rc->keyframe_locations[rc->KF_idx] -      rc->keyframe_locations[rc->KF_idx - 1]);                  if(c == EOF || c == '\n')
1388                            break;
         rc->overflow += rc->KFoverflow;  
         rc->KFoverflow = s->desired_length - data->length;  
1389    
1390          if (kfdiff > 1) {  // non-consecutive keyframes                  /* Do we have to update buffer ? */
1391              rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);                  if(pos >= buffer_size - 1) {
1392          }else{ // consecutive keyframes                          buffer_size += BUF_SZ;
1393                          rc->overflow += rc->KFoverflow;                          buffer = (char*)realloc(buffer, buffer_size);
1394                          rc->KFoverflow = 0;                          if (buffer == NULL)
1395                          rc->KFoverflow_partial = 0;                                  return(NULL);
         }  
         rc->KF_idx++;  
     }else{  
         // distribute part of the keyframe overflow  
         rc->overflow += s->desired_length - data->length + rc->KFoverflow_partial;  
         rc->KFoverflow -= rc->KFoverflow_partial;  
1396      }      }
1397    
1398      DPRINTF(XVID_DEBUG_RC, "[%i] quant:%i stats1:%i scaled:%i actual:%i overflow:%i\n",                  buffer[pos] = c;
1399          data->frame_num,                  pos++;
1400          data->quant,          } while(1);
         s->length,  
         s->scaled_length,  
         data->length,  
         rc->overflow);  
1401    
1402      return(0);          /* Read \n or EOF */
1403            if (buffer == NULL) {
1404                    /* EOF, so we reached the end of the file, return NULL */
1405                    if(feof(f))
1406                            return(NULL);
1407    
1408                    /* Just an empty line with just a newline, allocate a 1 byte buffer to
1409                     * store a zero length string */
1410                    buffer = (char*)malloc(1);
1411                    if(buffer == NULL)
1412                            return(NULL);
1413  }  }
1414    
1415            /* Zero terminated string */
1416            buffer[pos] = '\0';
1417    
1418            return(buffer);
1419    }
1420    
1421  int xvid_plugin_2pass2(void * handle, int opt, void * param1, void * param2)  /* This function returns a pointer to the first non space char in the given
1422     * string */
1423    static char *
1424    skipspaces(char *string)
1425  {  {
1426      switch(opt)          const char spaces[] =
1427      {      {
1428      case XVID_PLG_INFO :                          ' ','\t','\0'
1429          return 0;                  };
1430            const char *spacechar = spaces;
1431    
1432            if (string == NULL) return(NULL);
1433    
1434            while (*string != '\0') {
1435                    /* Test against space chars */
1436                    while (*spacechar != '\0') {
1437                            if (*string == *spacechar) {
1438                                    string++;
1439                                    spacechar = spaces;
1440                                    break;
1441                            }
1442                            spacechar++;
1443                    }
1444    
1445      case XVID_PLG_CREATE :                  /* No space char */
1446          return rc_2pass2_create((xvid_plg_create_t*)param1, param2);                  if (*spacechar == '\0') return(string);
1447            }
1448    
1449      case XVID_PLG_DESTROY :          return(string);
1450          return rc_2pass2_destroy((rc_2pass2_t*)handle, (xvid_plg_destroy_t*)param1);  }
1451    
1452      case XVID_PLG_BEFORE :  /* This function returns a boolean that tells if the string is only a
1453          return rc_2pass2_before((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);   * comment */
1454    static int
1455    iscomment(char *string)
1456    {
1457            const char comments[] =
1458                    {
1459                            '#',';', '%', '\0'
1460                    };
1461            const char *cmtchar = comments;
1462            int iscomment = 0;
1463    
1464            if (string == NULL) return(1);
1465    
1466            string = skipspaces(string);
1467    
1468            while(*cmtchar != '\0') {
1469                    if(*string == *cmtchar) {
1470                            iscomment = 1;
1471                            break;
1472                    }
1473                    cmtchar++;
1474            }
1475    
1476      case XVID_PLG_AFTER :          return(iscomment);
         return rc_2pass2_after((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);  
1477      }      }
1478    
1479      return XVID_ERR_FAIL;  #if 0
1480    static void
1481    stats_print(rc_2pass2_t * rc)
1482    {
1483            int i;
1484            const char frame_type[4] = { 'i', 'p', 'b', 's'};
1485    
1486            for (i=0; i<rc->num_frames; i++) {
1487                    twopass_stat_t *s = &rc->stats[i];
1488                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- frame:%d type:%c quant:%d stats:%d scaled:%d desired:%d actual:%d overflow(%c):%.2f\n",
1489                                    i, frame_type[s->type-1], -1, s->length, s->scaled_length,
1490                                    s->desired_length, -1, frame_type[s->type-1], -1.0f);
1491            }
1492  }  }
1493    #endif
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