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revision 977, Tue Apr 8 14:01:35 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 Edouard Gomez <ed.gomez@wanadoo.fr>   *  Copyright (C)      2002 Foxer <email?>
7     *                     2002 Dirk Knop <dknop@gwdg.de>
8     *                2002-2003 Edouard Gomez <ed.gomez@free.fr>
9     *                     2003 Pete Ross <pross@xvid.org>
10   *   *
11   * The curve treatment algorithm is the one implemented by Foxer <email?> and   *  This curve treatment algorithm is the one originally implemented by Foxer
12   * Dirk Knop <dknop@gwdg.de> for the XviD vfw dynamic library.   *  and tuned by Dirk Knop for the XviD vfw frontend.
13   *   *
14   * This program is free software; you can redistribute it and/or modify   * This program is free software; you can redistribute it and/or modify
15   * it under the terms of the GNU General Public License as published by   * it under the terms of the GNU General Public License as published by
# Line 22  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 1.1.2.2 2003-04-08 14:01:09 suxen_drol 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>
 #define RAD2DEG 57.295779513082320876798154814105  
 #define DEG2RAD 0.017453292519943295769236907684886  
38    
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;          int desired_length;     /* desired length; calculated during encoding */
80  } stat_t;          int error;
   
81    
82            int zone_mode;   /* XVID_ZONE_xxx */
83            double weight;
84    } 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 bitrate */  
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 */  
   
     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;
 } rc_2pass2_t;  
   
169    
170            /* Array of all 1st pass data file -- see the twopass_stat_t structure
171             * 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  #define BUF_SZ 1024          /*----------------------------------
193  #define MAX_COLS    5           * 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            /*----------------------------------
211             * 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 :
237                    return 0;
238    
239      rc->num_frames = 0;          case XVID_PLG_CREATE :
240      rc->num_keyframes = 0;                  return rc_2pass2_create((xvid_plg_create_t*)param1, param2);
241    
242      if ((f = fopen(filename, "rt")) == NULL)          case XVID_PLG_DESTROY :
243          return 0;                  return rc_2pass2_destroy((rc_2pass2_t*)handle, (xvid_plg_destroy_t*)param1);
244    
245      while((n = fscanf(f, "%c %d %d %d %d %d %d\n",          case XVID_PLG_BEFORE :
246          &type, &ignore, &ignore, &ignore, &ignore, &ignore, &ignore)) != EOF) {                  return rc_2pass2_before((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);
         if (type == 'i') {  
             rc->num_frames++;  
             rc->num_keyframes++;  
         }else if (type == 'p' || type == 'b' || type == 's') {  
             rc->num_frames++;  
         }  
     }  
247    
248      fclose(f);          case XVID_PLG_AFTER :
249                    return rc_2pass2_after((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);
250            }
251    
252      return 1;          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  /* scale the curve */  /*----------------------------------------------------------------------------
271     *--------------------------------------------------------------------------*/
272    
273  static void internal_scale(rc_2pass2_t *rc)  static int
274    rc_2pass2_create(xvid_plg_create_t * create, rc_2pass2_t **handle)
275  {  {
276          int64_t target  = rc->target;          xvid_plugin_2pass2_t * param = (xvid_plugin_2pass2_t *)create->param;
277          int64_t tot_length = rc->tot_length[0] + rc->tot_length[1] + rc->tot_length[2];          rc_2pass2_t * rc;
         int min_size[3];  
         double scaler;  
278          int i;          int i;
279    
280          if (target <= 0 || target >= tot_length) {          rc = malloc(sizeof(rc_2pass2_t));
281                  printf("undersize warning\n");          if (rc == NULL)
282          }                  return XVID_ERR_MEMORY;
283    
284            rc->param = *param;
285    
286          /* perform an initial scale pass.          /* Initialize all defaults */
287             if a frame size is scaled underneath our hardcoded minimums, then we force the  #define _INIT(a, b) if((a) <= 0) (a) = (b)
288             frame size to the minimum, and deduct the original & scaled frmae length from the          /* Let's set our defaults if needed */
289             original and target total lengths */          _INIT(rc->param.keyframe_boost, DEFAULT_KEYFRAME_BOOST);
290            _INIT(rc->param.overflow_control_strength, DEFAULT_OVERFLOW_CONTROL_STRENGTH);
291            _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          min_size[0] = ((rc->stats[0].blks[0]*22) + 240) / 8;          /* Initialize some stuff to zero */
302          min_size[1] = (rc->stats[0].blks[0] + 88) / 8;          for(i=0; i<3; i++) {
303          min_size[2] = 8;                  int j;
304                    for (j=0; j<32; j++) {
305                            rc->quant_error[i][j] = 0;
306                            rc->quant_count[i][j] = 0;
307                    }
308            }
309    
310            for (i=0; i<3; i++) rc->last_quant[i] = 0;
311    
312          scaler = (double)target / (double)tot_length;          rc->fq_error = 0;
         //printf("target=%i, tot_length=%i, scaler=%f\n", (int)target, (int)tot_length, scaler);  
313    
314          for (i=0; i<rc->num_frames; i++) {          /* Count frames (and intra frames) in the stats file, store the result into
315                  stat_t * s = &rc->stats[i];           * the rc structure */
316                  int len;          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                  len = (int)((double)s->length * scaler);          /* Allocate the stats' memory */
323                  if (len < min_size[s->type]) {          /* force frame size */          if ((rc->stats = malloc(rc->num_frames * sizeof(twopass_stat_t))) == NULL) {
324                          s->scaled_length = min_size[s->type];                  free(rc);
325                          target -= s->scaled_length;                  return(XVID_ERR_MEMORY);
                         tot_length -= s->length;  
                 }else{  
                         s->scaled_length = 0;  
326                  }                  }
327    
328            /* 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          if (target <= 0 || target >= tot_length) {          /* Load the first pass stats */
338                  printf("undersize warning\n");          if (statsfile_load(rc, param->filename) == -1) {
339                  return;                  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          scaler = (double)target / (double)tot_length;          /* Compute the target filesize */
347          //printf("target=%i, tot_length=%i, scaler=%f\n", (int)target, (int)tot_length, scaler);          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            /* When bitrate is not given it means it has been scaled by an external
391             * application */
392            if (rc->param.bitrate) {
393                    /* Apply zone settings
394                     * - 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                            rc->stats[i].weight = 1.0;
                 if (s->scaled_length==0) {      /* ignore frame with forced frame sizes */  
                         s->scaled_length = (int)((double)s->length * scaler);  
406                  }                  }
407                    rc->avg_weight = 1.0;
408                    rc->tot_quant = 0;
409          }          }
410    
411            /* Apply advanced curve options, and compute some parameters in order to
412             * shape the curve in the BEFORE/AFTER pair of functions */
413            scaled_curve_apply_advanced_parameters(rc);
414    
415            *handle = rc;
416            return(0);
417  }  }
418    
419    /*----------------------------------------------------------------------------
420     *--------------------------------------------------------------------------*/
421    
422    static int
423    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            free(rc->keyframe_locations);
433            free(rc->stats);
434            free(rc);
435            return(0);
436    }
437    
438    /*----------------------------------------------------------------------------
439     *--------------------------------------------------------------------------*/
440    
441  /* static void internal_scale(rc_2pass2_t *rc)  static int
442    rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)
443  {  {
444      const double avg_pvop = rc->avg_length[XVID_TYPE_PVOP-1];          twopass_stat_t * s = &rc->stats[data->frame_num];
445      const double avg_bvop = rc->avg_length[XVID_TYPE_BVOP-1];          double dbytes;
446      const uint64_t tot_pvop = rc->tot_length[XVID_TYPE_PVOP-1];          double scaled_quant;
447      const uint64_t tot_bvop = rc->tot_length[XVID_TYPE_BVOP-1];          double overflow;
448      uint64_t i_total = 0;          int capped_to_max_framesize = 0;
         double total1,total2;  
     int i;  
449    
450      for (i=0; i<rc->num_frames; i++) {          /* This function is quite long but easy to understand. In order to simplify
451          stat_t * s = &rc->stats[i];           * the code path (a bit), we treat 3 cases that can return immediatly. */
452    
453                  if (s->type == XVID_TYPE_IVOP) {          /* First case: Another plugin has already set a quantizer */
454                          i_total += s->length + s->length * rc->param.keyframe_boost / 100;          if (data->quant > 0)
455                    return(0);
456    
457            /* Second case: insufficent stats data */
458            if (data->frame_num >= rc->num_frames) {
459                    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                    s->desired_length = s->length;
471    
472                    return(0);
473          }          }
474    
         // compensate for avi frame overhead  
         rc->target_size -= rc->num_frames * 24;  
475    
476          // perform prepass to compensate for over/undersizing          /*************************************************************************/
477            /*************************************************************************/
478            /*************************************************************************/
479    
480            /*-------------------------------------------------------------------------
481             * Frame bit allocation first part
482             *
483             * First steps apply user settings, just like it is done in the theoritical
484             * scaled_curve_apply_advanced_parameters
485             *-----------------------------------------------------------------------*/
486    
487            /* Set desired to what we are wanting to obtain for this frame */
488            dbytes = (double)s->scaled_length;
489    
490          if (rc->param.use_alt_curve) {          /* 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          rc->alt_curve_low = avg_pvop - avg_pvop * (double)rc->param.alt_curve_low_dist / 100.0;  #if 0 /* ToDo: decide how to apply kfthresholding */
496                  rc->alt_curve_low_diff = avg_pvop - rc->alt_curve_low;  #endif
                 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->alt_curve_use_auto) {  
                         if (rc->movie_curve > 1.0) {  
                                 rc->param.alt_curve_min_rel_qual = (int)(100.0 - (100.0 - 100.0 / rc->movie_curve) * (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;  
497              }else{              }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;  
498    
499                  if (rc->param.alt_curve_low_dist > 100) {                  /* P/S/B frames must reserve some bits for iframe boosting */
500                          switch(rc->param.alt_curve_type) {                  dbytes *= rc->pb_iboost_tax_ratio;
501                          case XVID_CURVE_SINE : // Sine Curve (high aggressiveness)  
502                                  rc->alt_curve_qual_dev *= 2.0 / (1.0 + sin(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff)));                  /* Apply assymetric curve compression */
503                                  rc->alt_curve_mid_qual = 1.0 - rc->alt_curve_qual_dev * sin(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff));                  if (rc->param.curve_compression_high || rc->param.curve_compression_low) {
504                                  break;                          double assymetric_delta;
505                          case XVID_CURVE_LINEAR : // Linear (medium aggressiveness)  
506                                  rc->alt_curve_qual_dev *= 2.0 / (1.0 + avg_pvop / rc->alt_curve_low_diff);                          /* Compute the assymetric delta, this is computed before applying
507                                  rc->alt_curve_mid_qual = 1.0 - rc->alt_curve_qual_dev * avg_pvop / rc->alt_curve_low_diff;                           * the tax, as done in the pre_process function */
508                                  break;                          if (dbytes > rc->avg_length[s->type-1])
509                          case XVID_CURVE_COSINE : // Cosine Curve (low aggressiveness)                                  assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_high / 100.0;
510                                  rc->alt_curve_qual_dev *= 2.0 / (1.0 +  (1.0 - cos(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff))));                          else
511                                  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)));                                  assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_low  / 100.0;
512                          }  
513                            /* Now we must apply the assymetric tax, else our curve compression
514                             * 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          }          }
522    
523          total1 = 0;          /* That is what we would like to have -- Don't put that chunk after
524          total2 = 0;           * 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      for (i=0; i<rc->num_frames; i++) {          /*------------------------------------------------------------------------
530          stat_t * s = &rc->stats[i];           * Frame bit allocation: overflow control part.
531             *
532             * Unlike the theoritical scaled_curve_apply_advanced_parameters, here
533             * it's real encoding and we need to make sure we don't go so far from
534             * what is our ideal scaled curve.
535             *-----------------------------------------------------------------------*/
536    
537            /* Compute the overflow we should compensate */
538                  if (s->type != XVID_TYPE_IVOP) {                  if (s->type != XVID_TYPE_IVOP) {
539                    double frametype_factor;
540                    double framesize_factor;
541    
542              double dbytes = s->length / rc->movie_curve;                  /* Take only the desired part of overflow */
543              double dbytes2;                  overflow = rc->overflow;
544                          total1 += dbytes;  
545                    /* Factor that will take care to decrease the overflow applied
546                          if (s->type == XVID_TYPE_BVOP)                   * according to the importance of this frame type in term of
547                                  dbytes *= avg_pvop / avg_bvop;                   * overall size */
548                    frametype_factor  = rc->count[XVID_TYPE_IVOP-1]*rc->avg_length[XVID_TYPE_IVOP-1];
549                          if (rc->param.use_alt_curve) {                  frametype_factor += rc->count[XVID_TYPE_PVOP-1]*rc->avg_length[XVID_TYPE_PVOP-1];
550                                  if (dbytes > avg_pvop) {                  frametype_factor += rc->count[XVID_TYPE_BVOP-1]*rc->avg_length[XVID_TYPE_BVOP-1];
551                      if (dbytes >= rc->alt_curve_high) {                  frametype_factor /= rc->count[s->type-1]*rc->avg_length[s->type-1];
552                                                  dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev);                  frametype_factor  = 1/frametype_factor;
553                      }else{  
554                                                  switch(rc->param.alt_curve_type){                  /* Factor that will take care not to compensate too much for this frame
555                                                  case XVID_CURVE_SINE :                   * size */
556                                                      dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * sin(DEG2RAD * ((dbytes - avg_pvop) * 90.0 / rc->alt_curve_high_diff)));                  framesize_factor  = dbytes;
557                                                          break;                  framesize_factor /= rc->avg_length[s->type-1];
558                                                  case XVID_CURVE_LINEAR :  
559                                                      dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - avg_pvop) / rc->alt_curve_high_diff);                  /* Treat only the overflow part concerned by this frame type and size */
560                                                          break;                  overflow *= frametype_factor;
561                                                  case XVID_CURVE_COSINE :  #if 0
562                                                      dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * ((dbytes - avg_pvop) * 90.0 / rc->alt_curve_high_diff))));                  /* Leave this one alone, as it impacts badly on quality */
563                                                  }                  overflow *= framesize_factor;
564                                          }  #endif
565                                  }else{  
566                      if (dbytes <= rc->alt_curve_low){                  /* Apply the overflow strength imposed by the user */
567                                                  dbytes2 = dbytes;                  overflow *= (rc->param.overflow_control_strength/100.0f);
568                      }else{          } else {
569                                                  switch(rc->param.alt_curve_type){                  /* no overflow applied in IFrames because:
570                                                  case XVID_CURVE_SINE :                   *  - their role is important as they're references for P/BFrames.
571                                                      dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * sin(DEG2RAD * ((dbytes - avg_pvop) * 90.0 / rc->alt_curve_low_diff)));                   *  - there aren't much in typical sequences, so if an IFrame overflows too
572                                                          break;                   *    much, this overflow may impact the next IFrame too much and generate
573                                                  case XVID_CURVE_LINEAR :                   *    a sequence of poor quality frames */
574                                                      dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - avg_pvop) / rc->alt_curve_low_diff);                  overflow = 0;
                                                         break;  
                                                 case XVID_CURVE_COSINE :  
                                                     dbytes2 = dbytes * (rc->alt_curve_mid_qual + rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * ((dbytes - avg_pvop) * 90.0 / rc->alt_curve_low_diff))));  
                                                 }  
                                         }  
                                 }  
                         }else{  
                 if (dbytes > avg_pvop) {  
                                         dbytes2 = ((double)dbytes + (avg_pvop - dbytes) *  
                                                 rc->param.curve_compression_high / 100.0);  
                                 }else{  
                                         dbytes2 = ((double)dbytes + (avg_pvop - dbytes) *  
                                                 rc->param.curve_compression_low / 100.0);  
                                 }  
575                          }                          }
576    
577                          if (s->type == XVID_TYPE_BVOP) {          /* Make sure we are not trying to compensate more overflow than we even have */
578                                  dbytes2 *= avg_bvop / avg_pvop;          if (fabs(overflow) > fabs(rc->overflow))
579                    overflow = rc->overflow;
580    
581            /* Make sure the overflow doesn't make the frame size to get out of the range
582             * [-max_degradation..+max_improvment] */
583            if (overflow > dbytes*rc->param.max_overflow_improvement / 100) {
584                    if(overflow <= dbytes)
585                            dbytes += dbytes * rc->param.max_overflow_improvement / 100;
586                    else
587                            dbytes += overflow * rc->param.max_overflow_improvement / 100;
588            } else if (overflow < - dbytes * rc->param.max_overflow_degradation / 100) {
589                    dbytes -= dbytes * rc->param.max_overflow_degradation / 100;
590            } else {
591                    dbytes += overflow;
592              }              }
593    
594              if (dbytes2 < rc->min_length[s->type-1]) {          /*-------------------------------------------------------------------------
595             * Frame bit allocation last part:
596             *
597             * 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];                  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              total2 += dbytes2;          /*------------------------------------------------------------------------
616                  }           * Desired frame length <-> quantizer mapping
617          }           *-----------------------------------------------------------------------*/
618    
619          rc->curve_comp_scale = total1 / total2;  #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          if (!rc->param.use_alt_curve) {                  twopass_stat_t *b_ref = s;
                 printf("middle frame size for asymmetric curve compression: %i",  
             (int)(avg_pvop * rc->curve_comp_scale));  
         }  
 }*/  
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            /* Don't laugh at this very 'simple' quant<->size relationship, it
637             * proves to be acurate enough for our algorithm */
638            scaled_quant = (double)s->quant*(double)s->length/(double)dbytes;
639    
640    #ifdef COMPENSATE_FORMULA
641            /* 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                    twopass_stat_t *b_ref = s;
646    
647  /* open stats file(s) and read into rc->stats array */                  /* Find the reference frame */
648                    while(b_ref != &rc->stats[0] && b_ref->type == XVID_TYPE_BVOP)
649                            b_ref--;
650    
651  static int load_stats(rc_2pass2_t *rc, char * filename)                  /* Compute the quant it would be if the core did not apply the bframe
652  {                   * formula */
653      FILE * f;                  scaled_quant  = 100*scaled_quant - data->bquant_offset;
654      int i, not_scaled;                  scaled_quant += data->bquant_ratio - 1; /* to avoid rouding issues */
655                    scaled_quant /= data->bquant_ratio;
656            }
657    #endif
658    
659            /* Quantizer has been scaled using floating point operations/results, we
660             * must cast it to integer */
661            data->quant = (int)scaled_quant;
662    
663      if ((f = fopen(filename, "rt"))==NULL)          /* Let's clip the computed quantizer, if needed */
664          return 0;          if (data->quant < 1) {
665                    data->quant = 1;
666            } else if (data->quant > 31) {
667                    data->quant = 31;
668            } else {
669    
670      i = 0;                  /* The frame quantizer has not been clipped, this appears to be a good
671          not_scaled = 0;                   * computed quantizer, do not loose quantizer decimal part that we
672      while(i < rc->num_frames) {                   * accumulate for later reuse when its sum represents a complete
673          stat_t * s = &rc->stats[i];                   * unit. */
674          int n;                  rc->quant_error[s->type-1][data->quant] += scaled_quant - (double)data->quant;
         char type;  
675    
676                  s->scaled_length = 0;                  if (rc->quant_error[s->type-1][data->quant] >= 1.0) {
677          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);                          rc->quant_error[s->type-1][data->quant] -= 1.0;
678          if (n == EOF) break;                          data->quant++;
679                  if (n < 7) {                  } else if (rc->quant_error[s->type-1][data->quant] <= -1.0) {
680                          not_scaled = 1;                          rc->quant_error[s->type-1][data->quant] += 1.0;
681                            data->quant--;
682                  }                  }
   
         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 */  
             printf("unk\n");  
             continue;  
683          }          }
684    
685          i++;          /* Now we have a computed quant that is in the right quante range, with a
686             * 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             * Control could learn more about this quantizer, this knowledge is useful
689             * for future frames even if it this quantizer won't be really used atm,
690             * that's why we don't perform this clipping earlier. */
691            if (data->quant < data->min_quant[s->type-1]) {
692                    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            /* 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             * to predicted frames (P and B) */
700            if (s->type != XVID_TYPE_IVOP && rc->last_quant[s->type-1] && capped_to_max_framesize == 0) {
701    
702                    if (data->quant > rc->last_quant[s->type-1] + 2) {
703                            data->quant = rc->last_quant[s->type-1] + 2;
704                            DPRINTF(XVID_DEBUG_RC,
705                                            "[xvid rc] -- frame %d p/b-frame quantizer prevented from rising too steeply\n",
706                                            data->frame_num);
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      }      }
     rc->num_frames = i;  
715    
716      fclose(f);          /* We don't want to pollute the RC histerisis when our computed quant has
717             * been computed from a capped frame size */
718            if (capped_to_max_framesize == 0)
719                    rc->last_quant[s->type-1] = data->quant;
720    
721      return 1;          /* Don't forget to force 1st pass frame type ;-) */
722            data->type = s->type;
723    
724            return 0;
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            /* Insufficent stats data */
737            if (data->frame_num >= rc->num_frames)
738                    return 0;
739    
740            /* Update the quantizer counter */
741            rc->quant_count[s->type-1][data->quant]++;
742    
743  static void print_stats(rc_2pass2_t * rc)          /* Update the frame type overflow */
744  {          if (data->type == XVID_TYPE_IVOP) {
745      int i;                  int kfdiff = 0;
     for (i = 0; i < rc->num_frames; i++) {  
         stat_t * s = &rc->stats[i];  
         printf("%i %i %i %i\n", s->type, s->quant, s->length, s->scaled_length);  
746    
747                    if(rc->KF_idx != rc->num_frames -1) {
748                            kfdiff  = rc->keyframe_locations[rc->KF_idx+1];
749                            kfdiff -= rc->keyframe_locations[rc->KF_idx];
750      }      }
 }  
   
751    
752  /* pre-process the statistics data                  /* Flush Keyframe overflow accumulator */
753      this is a clone of vfw/src/2pass.c:codec_2pass_init minus file reading, alt_curve, internal scale                  rc->overflow += rc->KFoverflow;
 */  
754    
755  void pre_process0(rc_2pass2_t * rc)                  /* Store the frame overflow to the keyframe accumulator */
756  {                  rc->KFoverflow = s->desired_length - data->length;
     int i,j;  
757    
758      for (i=0; i<3; i++) {                  if (kfdiff > 1) {
759          rc->count[i]=0;                          /* Non-consecutive keyframes case:
760          rc->tot_length[i] = 0;                           * We can then divide this total keyframe overflow into equal parts
761          rc->last_quant[i] = 0;                           * 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 {
765                            /* Consecutive keyframes case:
766                             * Flush immediatly the keyframe overflow and reset keyframe
767                             * overflow */
768                            rc->overflow += rc->KFoverflow;
769                            rc->KFoverflow = 0;
770                            rc->KFoverflow_partial = 0;
771      }      }
772                    rc->KF_idx++;
773            } else {
774                    /* Accumulate the frame overflow */
775                    rc->overflow += s->desired_length - data->length;
776    
777      for (i=0; i<32;i++) {                  /* Distribute part of the keyframe overflow */
778          rc->pquant_error[i] = 0;                  rc->overflow += rc->KFoverflow_partial;
779          rc->bquant_error[i] = 0;  
780          rc->quant_count[i] = 0;                  /* Don't forget to substract that same amount from the total keyframe
781                     * overflow */
782                    rc->KFoverflow -= rc->KFoverflow_partial;
783      }      }
784    
785      for (i=j=0; i<rc->num_frames; i++) {          rc->overflow += (s->error = s->desired_length - data->length);
786          stat_t * s = &rc->stats[i];          rc->real_total += data->length;
787    
788          rc->count[s->type-1]++;          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->tot_length[s->type-1] += s->length;                          data->frame_num,
790                            frame_type[data->type-1],
791                            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          if (i == 0 || s->length < rc->min_length[s->type-1]) {          return(0);
             rc->min_length[s->type-1] = s->length;  
800          }          }
801    
802          if (i == 0 || s->length > rc->max_length) {  /*****************************************************************************
803              rc->max_length = s->length;   * Helper functions definition
804          }   ****************************************************************************/
805    
806          if (s->type == XVID_TYPE_IVOP) {  /* Default buffer size for reading lines */
807              rc->keyframe_locations[j] = i;  #define BUF_SZ   1024
             j++;  
         }  
     }  
     rc->keyframe_locations[j] = i;  
 }  
808    
809    /* 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            FILE * f;
820            char *line;
821            int lines;
822    
823            rc->num_frames = 0;
824            rc->num_keyframes = 0;
825    
826  void pre_process1(rc_2pass2_t * rc)          if ((f = fopen(filename, "rb")) == NULL)
827  {                  return(-1);
     int i;  
     double total1, total2;  
     uint64_t ivop_boost_total;  
828    
829      ivop_boost_total = 0;          lines = 0;
830      rc->curve_comp_error = 0;          while ((line = readline(f)) != NULL) {
831    
832      for (i=0; i<3; i++) {                  char *ptr;
833          rc->tot_scaled_length[i] = 0;                  char type;
834      }                  int fields;
835    
836      for (i=0; i<rc->num_frames; i++) {                  lines++;
         stat_t * s = &rc->stats[i];  
837    
838          rc->tot_scaled_length[s->type-1] += s->scaled_length;                  /* We skip spaces */
839                    ptr = skipspaces(line);
840    
841          if (s->type == XVID_TYPE_IVOP) {                  /* Skip coment lines or empty lines */
842              ivop_boost_total += s->scaled_length * rc->param.keyframe_boost / 100;                  if(iscomment(ptr) || *ptr == '\0') {
843          }                          free(line);
844                            continue;
845      }      }
846    
847      rc->movie_curve = ((double)(rc->tot_scaled_length[XVID_TYPE_PVOP-1] + rc->tot_scaled_length[XVID_TYPE_BVOP-1] + ivop_boost_total) /                  /* Read the stat line from buffer */
848                                          (rc->tot_scaled_length[XVID_TYPE_PVOP-1] + rc->tot_scaled_length[XVID_TYPE_BVOP-1]));                  fields = sscanf(ptr, "%c", &type);
849    
850      for(i=0; i<3; i++) {                  /* Valid stats files have at least 7 fields */
851          if (rc->count[i] == 0 || rc->movie_curve == 0) {                  if (fields == 1) {
852              rc->avg_length[i] = 1;                          switch(type) {
853                            case 'i':
854                            case 'I':
855                                    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                            }
869          }else{          }else{
870              rc->avg_length[i] = rc->tot_scaled_length[i] / rc->count[i] / rc->movie_curve;                                  DPRINTF(XVID_DEBUG_RC,
871                                                    "[xvid rc] -- WARNING: L%d misses some stat fields (%d).\n",
872                                                    lines, 7-fields);
873          }          }
874    
875                    /* Free the line buffer */
876                    free(line);
877      }      }
878    
879      /* alt curve stuff here */          /* We are done with the file */
880            fclose(f);
881    
882      if (rc->param.use_alt_curve) {          return(0);
883          const double avg_pvop = rc->avg_length[XVID_TYPE_PVOP-1];  }
         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];  
884    
885                  rc->alt_curve_low = avg_pvop - avg_pvop * (double)rc->param.alt_curve_low_dist / 100.0;  /* open stats file(s) and read into rc->stats array */
886                  rc->alt_curve_low_diff = avg_pvop - rc->alt_curve_low;  static int
887                  rc->alt_curve_high = avg_pvop + avg_pvop * (double)rc->param.alt_curve_high_dist / 100.0;  statsfile_load(rc_2pass2_t *rc, char * filename)
888                  rc->alt_curve_high_diff = rc->alt_curve_high - avg_pvop;  {
889            FILE * f;
890            int processed_entries;
891    
892          if (rc->param.alt_curve_use_auto) {          /* Opens the file */
893              if (tot_bvop + tot_pvop > tot_scaled_bvop + tot_scaled_pvop) {          if ((f = fopen(filename, "rb"))==NULL)
894                                  rc->param.alt_curve_min_rel_qual = (int)(100.0 - (100.0 - 100.0 /                  return(-1);
                                         ((double)(tot_pvop + tot_bvop) / (double)(tot_scaled_pvop + tot_scaled_bvop))) * (double)rc->param.alt_curve_auto_str / 100.0);  
895    
896                                  if (rc->param.alt_curve_min_rel_qual < 20)          processed_entries = 0;
897                                          rc->param.alt_curve_min_rel_qual = 20;          while(processed_entries < rc->num_frames) {
898              }else{                  char type;
899                                  rc->param.alt_curve_min_rel_qual = 100;                  int fields;
900              }                  twopass_stat_t * s = &rc->stats[processed_entries];
901          }                  char *line, *ptr;
                 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;  
902    
903          if (rc->param.alt_curve_low_dist > 100) {                  /* Read the line from the file */
904                          switch(rc->param.alt_curve_type) {                  if((line = readline(f)) == NULL)
             case XVID_CURVE_SINE: // Sine Curve (high aggressiveness)  
                                 rc->alt_curve_qual_dev *= 2.0 / (1.0 + sin(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff)));  
                                 rc->alt_curve_mid_qual = 1.0 - rc->alt_curve_qual_dev * sin(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff));  
905                                  break;                                  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)));  
                         }  
                 }  
     }  
     /* --- */  
906    
907                    /* We skip spaces */
908                    ptr = skipspaces(line);
909    
910      total1=total2=0;                  /* Skip comment lines or empty lines */
911      for (i=0; i<rc->num_frames; i++) {                  if(iscomment(ptr) || *ptr == '\0') {
912          stat_t * s = &rc->stats[i];                          free(line);
913                            continue;
914          if (s->type != XVID_TYPE_IVOP) {                  }
             double dbytes,dbytes2;  
915    
916              dbytes = s->scaled_length / rc->movie_curve;                  /* Reset this field that is optional */
917              dbytes2 = 0; /* XXX: warning */                  s->scaled_length = 0;
             total1 += dbytes;  
             if (s->type == XVID_TYPE_BVOP)  
                 dbytes *= rc->avg_length[XVID_TYPE_PVOP-1] / rc->avg_length[XVID_TYPE_BVOP-1];  
918    
919              if (rc->param.use_alt_curve) {                  /* Convert the fields */
920                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                  fields = sscanf(ptr,
921                                                    "%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                      if (dbytes >= rc->alt_curve_high) {                  /* Convert frame type and compute the invariant length part */
937                                                  dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev);                  switch(type) {
938                      }else{                  case 'i':
939                                                  switch(rc->param.alt_curve_type) {                  case 'I':
940                          case XVID_CURVE_SINE :                          s->type = XVID_TYPE_IVOP;
941                                                      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)));                          s->invariant /= INVARIANT_HEADER_PART_IVOP;
                                                         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);  
942                                                          break;                                                          break;
943                                                  case XVID_CURVE_COSINE :                  case 'p':
944                                                      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))));                  case 'P':
945                                                  }                  case 's':
946                                          }                  case 'S':
947                  }else{                          s->type = XVID_TYPE_PVOP;
948                      if (dbytes <= rc->alt_curve_low) {                          s->invariant /= INVARIANT_HEADER_PART_PVOP;
                                                 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)));  
949                                                          break;                                                          break;
950                                                  case XVID_CURVE_LINEAR :                  case 'b':
951                                                      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);                  case 'B':
952                            s->type = XVID_TYPE_BVOP;
953                            s->invariant /= INVARIANT_HEADER_PART_BVOP;
954                                                          break;                                                          break;
955                                                  case XVID_CURVE_COSINE :                  default:
956                                                      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))));                          /* Same as before, fail silently */
957                            continue;
958                                                  }                                                  }
959    
960                    /* Ok it seems it's been processed correctly */
961                    processed_entries++;
962                                          }                                          }
963    
964            /* Close the file */
965            fclose(f);
966    
967            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              }else{          /* *rc fields initialization
979                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {           * NB: INT_MAX and INT_MIN are used in order to be immediately replaced
980                      dbytes2=((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_high / 100.0);           *     with real values of the 1pass */
981                  }else{          for (i=0; i<3; i++) {
982                                  dbytes2 = ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_low / 100.0);                  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            rc->max_length = INT_MIN;
989    
990            /* Loop through all frames and find/compute all the stuff this function
991             * is supposed to do */
992            for (i=j=0; i<rc->num_frames; i++) {
993                    twopass_stat_t * s = &rc->stats[i];
994    
995                    rc->count[s->type-1]++;
996                    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                            rc->min_length[s->type-1] = s->length;
1001              }              }
1002    
1003              if (s->type == XVID_TYPE_BVOP) {                  if (s->length > rc->max_length) {
1004                              dbytes2 *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];                          rc->max_length = s->length;
                             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];  
1005              }              }
1006              total2 += dbytes2;  
1007                    if (s->type == XVID_TYPE_IVOP) {
1008                            rc->keyframe_locations[j] = i;
1009                            j++;
1010          }          }
1011      }      }
1012    
1013      rc->curve_comp_scale = total1 / total2;          /* NB:
1014             * The "per sequence" overflow system considers a natural sequence to be
1015             * formed by all frames between two iframes, so if we want to make sure
1016             * the system does not go nuts during last sequence, we force the last
1017             * frame to appear in the keyframe locations array. */
1018            rc->keyframe_locations[j] = i;
1019    
1020      if (!rc->param.use_alt_curve) {          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Min 1st pass IFrame length: %d\n", rc->min_length[0]);
1021          printf("middle frame size for asymmetric curve compression: %i\n",          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Min 1st pass PFrame length: %d\n", rc->min_length[1]);
1022              (int)(rc->avg_length[XVID_TYPE_PVOP-1] * rc->curve_comp_scale));          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Min 1st pass BFrame length: %d\n", rc->min_length[2]);
1023      }      }
1024    
1025      if (rc->param.use_alt_curve) {  /* calculate zone weight "center" */
1026          int bonus_bias = rc->param.alt_curve_bonus_bias;  static void
1027          int oldquant = 1;  zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)
1028    {
1029              if (rc->param.alt_curve_use_auto_bonus_bias)          int i,j;
1030                      bonus_bias = rc->param.alt_curve_min_rel_qual;          int n = 0;
1031    
1032              rc->alt_curve_curve_bias_bonus = (total1 - total2) * (double)bonus_bias / 100.0 / (double)(rc->num_frames /* - credits_frames */ - rc->num_keyframes);          rc->avg_weight = 0.0;
1033              rc->curve_comp_scale = ((total1 - total2) * (1.0 - (double)bonus_bias / 100.0) + total2) / total2;          rc->tot_quant = 0;
1034            rc->tot_quant_invariant = 0;
1035    
1036            if (create->num_zones == 0) {
1037                    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    
         /* special info for alt curve:  bias bonus and quantizer thresholds */  
1045    
1046                  printf("avg scaled framesize:%i", (int)rc->avg_length[XVID_TYPE_PVOP-1]);          for(i=0; i < create->num_zones; i++) {
                 printf("bias bonus:%i bytes", (int)rc->alt_curve_curve_bias_bonus);  
1047    
1048                  for (i=1; i <= (int)(rc->alt_curve_high*2)+1; i++) {                  int next = (i+1<create->num_zones) ? create->zones[i+1].frame : rc->num_frames;
             double curve_temp, dbytes;  
             int newquant;  
1049    
1050              dbytes = i;                  if (i==0 && create->zones[i].frame > 0) {
1051                          if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                          for (j = 0; j < create->zones[i].frame && j < rc->num_frames; j++) {
1052                  if (dbytes >= rc->alt_curve_high) {                                  rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1053                                          curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev);                                  rc->stats[j].weight = 1.0;
                 }else{  
                                         switch(rc->param.alt_curve_type)  
                                         {  
                                         case XVID_CURVE_SINE :  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * sin(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_high_diff)));  
                                                 break;  
                                         case XVID_CURVE_LINEAR :  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) / rc->alt_curve_high_diff);  
                                                 break;  
                                         case XVID_CURVE_COSINE :  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_high_diff))));  
                                         }  
                                 }  
                         }else{  
                 if (dbytes <= rc->alt_curve_low) {  
                                         curve_temp = dbytes;  
                 }else{  
                                         switch(rc->param.alt_curve_type)  
                                         {  
                                         case XVID_CURVE_SINE :  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * sin(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_low_diff)));  
                                                 break;  
                                         case XVID_CURVE_LINEAR :  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) / rc->alt_curve_low_diff);  
                                                 break;  
                                         case XVID_CURVE_COSINE :  
                                                 curve_temp = dbytes * (rc->alt_curve_mid_qual + rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_low_diff))));  
                                         }  
1054                                  }                                  }
1055                            rc->avg_weight += create->zones[i].frame * 1.0;
1056                            n += create->zones[i].frame;
1057                          }                          }
1058    
1059                          if (rc->movie_curve > 1.0)                  if (create->zones[i].mode == XVID_ZONE_WEIGHT) {
1060                                  dbytes *= rc->movie_curve;                          for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {
1061                                    rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1062                          newquant = (int)(dbytes * 2.0 / (curve_temp * rc->curve_comp_scale + rc->alt_curve_curve_bias_bonus));                                  rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;
                         if (newquant > 1) {  
                                 if (newquant != oldquant) {  
                     int percent = (int)((i - rc->avg_length[XVID_TYPE_PVOP-1]) * 100.0 / rc->avg_length[XVID_TYPE_PVOP-1]);  
                                         oldquant = newquant;  
                                         printf("quant:%i threshold at %i : %i percent", newquant, i, percent);  
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      rc->overflow = 0;          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- center_weight:%f (for %d frames)  fixed_bytes:%d\n", rc->avg_weight, n, rc->tot_quant);
     rc->KFoverflow = 0;  
     rc->KFoverflow_partial = 0;  
     rc->KF_idx = 1;  
1079  }  }
1080    
1081    
1082    /* scale the curve */
1083    static void
1084  static int rc_2pass2_create(xvid_plg_create_t * create, rc_2pass2_t ** handle)  first_pass_scale_curve_internal(rc_2pass2_t *rc)
1085  {  {
1086      xvid_plugin_2pass2_t * param = (xvid_plugin_2pass2_t *)create->param;          int64_t target;
1087      rc_2pass2_t * rc;          int64_t pass1_length;
1088            int64_t total_invariant;
1089      rc = malloc(sizeof(rc_2pass2_t));          double scaler;
1090      if (rc == NULL)          int i, num_MBs;
         return XVID_ERR_MEMORY;  
   
     rc->param = *param;  
   
     if (rc->param.keyframe_boost <= 0) rc->param.keyframe_boost = 0;  
     if (rc->param.payback_method <= 0) rc->param.payback_method = XVID_PAYBACK_PROP;  
     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.min_quant[0] <= 0) rc->param.min_quant[0] = 2;  
     if (rc->param.max_quant[0] <= 0) rc->param.max_quant[0] = 31;  
     if (rc->param.min_quant[1] <= 0) rc->param.min_quant[1] = 2;  
     if (rc->param.max_quant[1] <= 0) rc->param.max_quant[1] = 31;  
     if (rc->param.min_quant[2] <= 0) rc->param.min_quant[2] = 2;  
     if (rc->param.max_quant[2] <= 0) rc->param.max_quant[2] = 31;  
   
     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;  
1091    
1092      if (!det_stats_length(rc, param->filename)){          /* We only scale texture data ! */
1093          DPRINTF(DPRINTF_RC,"fopen %s failed\n", param->filename);          total_invariant  = rc->tot_invariant[XVID_TYPE_IVOP-1];
1094          free(rc);          total_invariant += rc->tot_invariant[XVID_TYPE_PVOP-1];
1095          return XVID_ERR_FAIL;          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            /* 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      if ((rc->stats = malloc(rc->num_frames * sizeof(stat_t))) == NULL) {          /* Number of MBs */
1130          free(rc);          num_MBs  = rc->stats[0].blks[0];
1131          return XVID_ERR_MEMORY;          num_MBs += rc->stats[0].blks[1];
1132      }          num_MBs += rc->stats[0].blks[2];
1133    
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      /* XXX: do we need an addition location */          /* Perform an initial scale pass.
1147      if ((rc->keyframe_locations = malloc((rc->num_keyframes + 1) * sizeof(int))) == NULL) {           *
1148          free(rc->stats);           * If a frame size is scaled underneath our hardcoded minimums, then we
1149          free(rc);           * force the frame size to the minimum, and deduct the original & scaled
1150          return XVID_ERR_MEMORY;           * frame length from the original and target total lengths */
1151      }          for (i=0; i<rc->num_frames; i++) {
1152                    twopass_stat_t * s = &rc->stats[i];
1153                    int len;
1154    
1155      if (!load_stats(rc, param->filename)) {                  /* No need to scale frame length for which a specific quantizer is
1156          DPRINTF(DPRINTF_RC,"fopen %s failed\n", param->filename);                   * specified thanks to zones */
1157          free(rc->keyframe_locations);                  if (s->zone_mode == XVID_ZONE_QUANT) {
1158          free(rc->stats);                          s->scaled_length = s->length;
1159          free(rc);                          continue;
         return XVID_ERR_FAIL;  
1160      }      }
1161    
1162      /* pre-process our stats */                  /* Compute the scaled length -- only non invariant data length is scaled */
1163                    len = s->invariant + (int)((double)(s->length-s->invariant) * scaler * s->weight / rc->avg_weight);
1164    
1165          {                  /* Compare with the computed minimum */
1166                  if (rc->num_frames  < create->fbase/create->fincr) {                  if (len < rc->min_length[s->type-1]) {
1167                          rc->target = rc->param.bitrate / 8;     /* one second */                          /* 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                             * total counters, as we prepare a second pass for 'regular'
1173                             * frames */
1174                            target -= s->scaled_length;
1175                            pass1_length -= s->length;
1176                  }else{                  }else{
1177                          rc->target = (rc->param.bitrate * rc->num_frames * create->fincr) / (create->fbase * 8);                          /* Do nothing for now, we'll scale this later */
1178                            s->scaled_length = 0;
1179                  }                  }
   
   
                 rc->target -= rc->num_frames*24;        /* avi file header */  
   
1180          }          }
1181    
1182            /* 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          pre_process0(rc);          /* Scaling factor for 'regular' frames */
1186          if (rc->param.bitrate) {          scaler = (double)(target - total_invariant) / (double)(pass1_length - total_invariant);
                 internal_scale(rc);  
         }  
         pre_process1(rc);pre_process1(rc);pre_process1(rc);  
1187    
1188      *handle = rc;          /* Detect undersizing */
1189          return(0);          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            /* 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  static int rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy)                  /* Ignore frame with forced frame sizes */
1199  {                  if (s->scaled_length == 0)
1200      free(rc->keyframe_locations);                          s->scaled_length = s->invariant + (int)((double)(s->length-s->invariant) * scaler * s->weight / rc->avg_weight);
     free(rc->stats);  
         free(rc);  
         return(0);  
1201  }  }
1202    
1203            /* Job done */
1204            return;
1205    }
1206    
1207    /* Apply all user settings to the scaled curve
1208  static int rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)   * This implies:
1209     *   keyframe boosting
1210     *   high/low compression */
1211    static void
1212    scaled_curve_apply_advanced_parameters(rc_2pass2_t * rc)
1213  {  {
1214      stat_t * s = &rc->stats[data->frame_num];          int i;
1215      int overflow;          int64_t ivop_boost_total;
     int desired;  
     double dbytes;  
     double curve_temp;  
     int capped_to_max_framesize = 0;  
   
     if (data->frame_num >= rc->num_frames) {  
         /* insufficent stats data */  
         return 0;  
     }  
1216    
1217      overflow = rc->overflow / 8;        /* XXX: why by 8 */          /* Reset the rate controller (per frame type) total byte counters */
1218            for (i=0; i<3; i++) rc->tot_scaled_length[i] = 0;
1219    
1220      if (s->type == XVID_TYPE_IVOP) {        /* XXX: why */          /* Compute total bytes for each frame type */
1221          overflow = 0;          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      desired = s->scaled_length;          /* 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      dbytes = desired;                  /* Some more work is needed for I frames */
1237      if (s->type == XVID_TYPE_IVOP) {      if (s->type == XVID_TYPE_IVOP) {
1238          dbytes += desired * rc->param.keyframe_boost / 100;                          int ivop_boost;
     }  
     dbytes /= rc->movie_curve;  
   
     if (s->type == XVID_TYPE_BVOP) {  
         dbytes *= rc->avg_length[XVID_TYPE_PVOP-1] / rc->avg_length[XVID_TYPE_BVOP-1];  
     }  
1239    
1240      if (rc->param.payback_method == XVID_PAYBACK_BIAS) {                          /* Accumulate bytes needed for keyframe boosting */
1241          desired =(int)(rc->curve_comp_error / rc->param.bitrate_payback_delay);                          ivop_boost = s->scaled_length*rc->param.keyframe_boost/100;
     }else{  
                 //printf("desired=%i, dbytes=%i\n", desired,dbytes);  
                 desired = (int)(rc->curve_comp_error * dbytes /  
                         rc->avg_length[XVID_TYPE_PVOP-1] / rc->param.bitrate_payback_delay);  
                 //printf("desired=%i\n", desired);  
   
                 if (labs(desired) > fabs(rc->curve_comp_error)) {  
                         desired = (int)rc->curve_comp_error;  
                 }  
     }  
1242    
1243      rc->curve_comp_error -= desired;  #if 0 /* ToDo: decide how to apply kfthresholding */
1244    #endif
1245                            /* If the frame size drops under the minimum length, then cap ivop_boost */
1246                            if (ivop_boost + s->scaled_length < rc->min_length[XVID_TYPE_IVOP-1])
1247                                    ivop_boost = rc->min_length[XVID_TYPE_IVOP-1] - s->scaled_length;
1248    
1249      /* alt curve */                          /* Accumulate the ivop boost */
1250                            ivop_boost_total += ivop_boost;
1251    
1252      curve_temp = 0; /* XXX: warning */                          /* Don't forget to update the keyframe index */
1253                            rc->KF_idx++;
     if (rc->param.use_alt_curve) {  
         if (s->type != XVID_TYPE_IVOP)  {  
             if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {  
                 if (dbytes >= rc->alt_curve_high) {  
                                         curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev);  
                 }else{  
                     switch(rc->param.alt_curve_type) {  
                                         case XVID_CURVE_SINE :  
                                             curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * sin(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_high_diff)));  
                                                 break;  
                                         case XVID_CURVE_LINEAR :  
                                             curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) / rc->alt_curve_high_diff);  
                                                 break;  
                                         case XVID_CURVE_COSINE :  
                                             curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_high_diff))));  
                                         }  
                                 }  
                         }else{  
                 if (dbytes <= rc->alt_curve_low){  
                                         curve_temp = dbytes;  
                 }else{  
                                         switch(rc->param.alt_curve_type) {  
                                         case XVID_CURVE_SINE :  
                                             curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * sin(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_low_diff)));  
                                                 break;  
                                         case XVID_CURVE_LINEAR :  
                                             curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) / rc->alt_curve_low_diff);  
                                                 break;  
                                         case XVID_CURVE_COSINE :  
                                             curve_temp = dbytes * (rc->alt_curve_mid_qual + rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_low_diff))));  
                     }  
1254                                  }                                  }
1255                          }                          }
                         if (s->type == XVID_TYPE_BVOP)  
                                 curve_temp *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
   
                         curve_temp = curve_temp * rc->curve_comp_scale + rc->alt_curve_curve_bias_bonus;  
1256    
1257                          desired += ((int)curve_temp);          /* Initialize the IBoost tax ratio for P/S/B frames
1258                          rc->curve_comp_error += curve_temp - (int)curve_temp;           *
1259                  }else{           * This ratio has to be applied to p/b/s frames in order to reserve
1260                          if (s->type == XVID_TYPE_BVOP)           * additional bits for keyframes (keyframe boosting) or if too much
1261                                  dbytes *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];           * 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                          desired += ((int)dbytes);          /* Compute the total length of p/b/s frames (temporary storage into
1268                          rc->curve_comp_error += dbytes - (int)dbytes;           * movie_curve) */
1269                  }          rc->pb_iboost_tax_ratio  = (double)rc->tot_scaled_length[XVID_TYPE_PVOP-1];
1270            rc->pb_iboost_tax_ratio += (double)rc->tot_scaled_length[XVID_TYPE_BVOP-1];
1271    
1272            /* 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      }else if ((rc->param.curve_compression_high + rc->param.curve_compression_low) &&   s->type != XVID_TYPE_IVOP) {          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- IFrame boost tax ratio:%.2f\n",
1281                            rc->pb_iboost_tax_ratio);
1282    
1283          curve_temp = rc->curve_comp_scale;          /* Compute the average size of frames per frame type */
1284          if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {          for(i=0; i<3; i++) {
1285              curve_temp *= ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_high / 100.0);                  /* 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              curve_temp *= ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_low / 100.0);                          rc->avg_length[i] = rc->tot_scaled_length[i];
         }  
   
         if (s->type == XVID_TYPE_BVOP){  
             curve_temp *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
         }  
1290    
1291          desired += (int)curve_temp;                          if (i == (XVID_TYPE_IVOP-1)) {
1292          rc->curve_comp_error += curve_temp - (int)curve_temp;                                  /* I Frames total has to be added the boost total */
1293                                    rc->avg_length[i] += ivop_boost_total;
1294      }else{      }else{
1295          if (s->type == XVID_TYPE_BVOP){                                  /* P/B frames has to taxed */
1296                          dbytes *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];                                  rc->avg_length[i] *= rc->pb_iboost_tax_ratio;
         }  
   
                 desired += (int)dbytes;  
                 rc->curve_comp_error += dbytes - (int)dbytes;  
1297      }      }
1298    
1299          if (desired > s->length){                          /* Finally compute the average frame size */
1300                  rc->curve_comp_error += desired - s->length;                          rc->avg_length[i] /= (double)rc->count[i];
                 desired = s->length;  
         }else{  
         if (desired < rc->min_length[s->type-1]) {  
             if (s->type == XVID_TYPE_IVOP){  
                 rc->curve_comp_error -= rc->min_length[XVID_TYPE_IVOP-1] - desired;  
1301              }              }
             desired = rc->min_length[s->type-1];  
1302          }          }
         }  
   
     s->desired_length = desired;  
1303    
1304            /* Assymetric curve compression */
1305            if (rc->param.curve_compression_high || rc->param.curve_compression_low) {
1306                    double symetric_total;
1307                    double assymetric_delta_total;
1308    
1309      /* if this keyframe is too close to the next, reduce it's byte allotment                  /* Like I frame boosting, assymetric curve compression modifies the total
1310      XXX: why do we do this after setting the desired length  */                   * amount of needed bits, we must compute the ratio so we can prescale
1311                     lengths */
1312          if (s->type == XVID_TYPE_IVOP) {                  symetric_total = 0;
1313                  int KFdistance = rc->keyframe_locations[rc->KF_idx] - rc->keyframe_locations[rc->KF_idx - 1];                  assymetric_delta_total = 0;
1314                    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 (KFdistance < rc->param.kftreshold) {                          /* I Frames are not concerned by assymetric scaling */
1320                            if (s->type == XVID_TYPE_IVOP)
1321                                    continue;
1322    
1323              KFdistance = KFdistance - rc->param.min_key_interval;                          /* During the real run, we would have to apply the iboost tax */
1324                            dbytes = s->scaled_length * rc->pb_iboost_tax_ratio;
1325    
1326                          if (KFdistance >= 0) {                          /* Update the symmetric curve compression total */
1327                  int KF_min_size;                          symetric_total += dbytes;
1328    
1329                                  KF_min_size = desired * (100 - rc->param.kfreduction) / 100;                          /* Apply assymetric curve compression */
1330                                  if (KF_min_size < 1)                          if (dbytes > rc->avg_length[s->type-1])
1331                                          KF_min_size = 1;                                  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                                  desired = KF_min_size + (desired - KF_min_size) * KFdistance /                          /* Cap to the minimum frame size if needed */
1336                                          (rc->param.kftreshold - rc->param.min_key_interval);                          if (dbytes + assymetric_delta < rc->min_length[s->type-1])
1337                                    assymetric_delta = rc->min_length[s->type-1] - dbytes;
1338    
1339                                  if (desired < 1)                          /* Accumulate after assymetric curve compression */
1340                                          desired = 1;                          assymetric_delta_total += assymetric_delta;
                         }  
1341                  }                  }
         }  
   
     overflow = (int)((double)overflow * desired / rc->avg_length[XVID_TYPE_PVOP-1]);  
1342    
1343          // Foxer: reign in overflow with huge frames                  /* Compute the tax that all p/b frames have to pay in order to respect the
1344          if (labs(overflow) > labs(rc->overflow)) {                   * bit distribution changes that the assymetric compression curve imposes
1345                  overflow = rc->overflow;                   * 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      // Foxer: make sure overflow doesn't run away          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Assymetric tax ratio:%.2f\n", rc->assymetric_tax_ratio);
1354    
1355          if (overflow > desired * rc->param.max_overflow_improvement / 100) {          /* Last bits that need to be reset */
1356                  desired += (overflow <= desired) ? desired * rc->param.max_overflow_improvement / 100 :          rc->overflow = 0;
1357                          overflow * rc->param.max_overflow_improvement / 100;          rc->KFoverflow = 0;
1358          }else if (overflow < desired * rc->param.max_overflow_degradation / -100){          rc->KFoverflow_partial = 0;
1359                  desired += desired * rc->param.max_overflow_degradation / -100;          rc->KF_idx = 0;
1360          }else{          rc->desired_total = 0;
1361                  desired += overflow;          rc->real_total = 0;
         }  
1362    
1363      if (desired > rc->max_length) {          /* Job done */
1364                  capped_to_max_framesize = 1;          return;
                 desired = rc->max_length;  
1365          }          }
1366    
1367      // make sure to not scale below the minimum framesize  /*****************************************************************************
1368      if (desired < rc->min_length[s->type-1]) {   * Still more low level stuff (nothing to do with stats treatment)
1369          desired = rc->min_length[s->type-1];   ****************************************************************************/
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            char *buffer = NULL;
1377            int buffer_size = 0;
1378            int pos = 0;
1379    
1380            do {
1381                    int c;
1382    
1383      // very 'simple' quant<->filesize relationship                  /* Read a character from the stream */
1384      data->quant= (s->quant * s->length) / desired;                  c = fgetc(f);
1385    
1386          if (data->quant < 1) {                  /* Is that EOF or new line ? */
1387                  data->quant = 1;                  if(c == EOF || c == '\n')
1388      } else if (data->quant > 31) {                          break;
                 data->quant = 31;  
         }  
         else if (s->type != XVID_TYPE_IVOP)  
         {  
                 // Foxer: aid desired quantizer precision by accumulating decision error  
                 if (s->type== XVID_TYPE_BVOP) {  
                         rc->bquant_error[data->quant] += ((double)(s->quant * s->length) / desired) - data->quant;  
1389    
1390                          if (rc->bquant_error[data->quant] >= 1.0) {                  /* Do we have to update buffer ? */
1391                                  rc->bquant_error[data->quant] -= 1.0;                  if(pos >= buffer_size - 1) {
1392                                  data->quant++;                          buffer_size += BUF_SZ;
1393                            buffer = (char*)realloc(buffer, buffer_size);
1394                            if (buffer == NULL)
1395                                    return(NULL);
1396                          }                          }
                 }else{  
                         rc->pquant_error[data->quant] += ((double)(s->quant * s->length) / desired) - data->quant;  
1397    
1398              if (rc->pquant_error[data->quant] >= 1.0) {                  buffer[pos] = c;
1399                                  rc->pquant_error[data->quant] -= 1.0;                  pos++;
1400                                  ++data->quant;          } while(1);
                         }  
                 }  
         }  
1401    
1402      /* cap to min/max quant */          /* 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      if (data->quant < rc->param.min_quant[s->type-1]) {                  /* Just an empty line with just a newline, allocate a 1 byte buffer to
1409          data->quant = rc->param.min_quant[s->type-1];                   * store a zero length string */
1410      }else if (data->quant > rc->param.max_quant[s->type-1]) {                  buffer = (char*)malloc(1);
1411          data->quant = rc->param.max_quant[s->type-1];                  if(buffer == NULL)
1412                            return(NULL);
1413      }      }
1414    
1415      /* subsequent p/b frame quants can only be +- 2 */          /* Zero terminated string */
1416          if (s->type != XVID_TYPE_IVOP && rc->last_quant[s->type-1] && capped_to_max_framesize == 0) {          buffer[pos] = '\0';
1417    
1418                  if (data->quant > rc->last_quant[s->type-1] + 2) {          return(buffer);
                         data->quant = rc->last_quant[s->type-1] + 2;  
                         DPRINTF(DPRINTF_RC, "p/b-frame quantizer prevented from rising too steeply");  
1419                  }                  }
1420                  if (data->quant < rc->last_quant[s->type-1] - 2) {  
1421                          data->quant = rc->last_quant[s->type-1] - 2;  /* This function returns a pointer to the first non space char in the given
1422                          DPRINTF(DPRINTF_RC, "p/b-frame quantizer prevented from falling too steeply");   * string */
1423    static char *
1424    skipspaces(char *string)
1425    {
1426            const char spaces[] =
1427                    {
1428                            ' ','\t','\0'
1429                    };
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          if (capped_to_max_framesize == 0) {                  /* No space char */
1446          rc->last_quant[s->type-1] = data->quant;                  if (*spacechar == '\0') return(string);
1447          }          }
1448    
1449          return 0;          return(string);
1450  }  }
1451    
1452    /* This function returns a boolean that tells if the string is only a
1453     * comment */
1454  static int rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)  static int
1455    iscomment(char *string)
1456  {  {
1457      stat_t * s = &rc->stats[data->frame_num];          const char comments[] =
1458                    {
1459      if (data->frame_num >= rc->num_frames) {                          '#',';', '%', '\0'
1460          /* insufficent stats data */                  };
1461          return 0;          const char *cmtchar = comments;
1462      }          int iscomment = 0;
1463    
1464      rc->quant_count[data->quant]++;          if (string == NULL) return(1);
1465    
1466      if (data->type == XVID_TYPE_IVOP) {          string = skipspaces(string);
1467          int kfdiff = (rc->keyframe_locations[rc->KF_idx] -      rc->keyframe_locations[rc->KF_idx - 1]);  
1468            while(*cmtchar != '\0') {
1469          rc->overflow += rc->KFoverflow;                  if(*string == *cmtchar) {
1470          rc->KFoverflow = s->desired_length - data->length;                          iscomment = 1;
1471                            break;
         if (kfdiff > 1) {  // non-consecutive keyframes  
             rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);  
         }else{ // consecutive keyframes  
                         rc->overflow += rc->KFoverflow;  
                         rc->KFoverflow = 0;  
                         rc->KFoverflow_partial = 0;  
1472          }          }
1473          rc->KF_idx++;                  cmtchar++;
     }else{  
         // distribute part of the keyframe overflow  
         rc->overflow += s->desired_length - data->length + rc->KFoverflow_partial;  
         rc->KFoverflow -= rc->KFoverflow_partial;  
1474      }      }
1475    
1476      printf("[%i] quant:%i stats1:%i scaled:%i actual:%i overflow:%i\n",          return(iscomment);
         data->frame_num,  
         data->quant,  
         s->length,  
         s->scaled_length,  
         data->length,  
         rc->overflow);  
   
     return(0);  
1477  }  }
1478    
1479    #if 0
1480    static void
1481  int xvid_plugin_2pass2(void * handle, int opt, void * param1, void * param2)  stats_print(rc_2pass2_t * rc)
1482  {  {
1483      switch(opt)          int i;
1484      {          const char frame_type[4] = { 'i', 'p', 'b', 's'};
     case XVID_PLG_INFO :  
         return 0;  
   
     case XVID_PLG_CREATE :  
         return rc_2pass2_create((xvid_plg_create_t*)param1, param2);  
   
     case XVID_PLG_DESTROY :  
         return rc_2pass2_destroy((rc_2pass2_t*)handle, (xvid_plg_destroy_t*)param1);  
   
     case XVID_PLG_BEFORE :  
         return rc_2pass2_before((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);  
1485    
1486      case XVID_PLG_AFTER :          for (i=0; i<rc->num_frames; i++) {
1487          return rc_2pass2_after((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);                  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      }      }
   
     return XVID_ERR_FAIL;  
1492  }  }
1493    #endif
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