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revision 977, Tue Apr 8 14:01:35 2003 UTC revision 1202, Sun Nov 9 20:49:21 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 1.1.2.24 2003-11-09 20:49:21 edgomez Exp $
29   *   *
30   *****************************************************************************/   *****************************************************************************/
31    
32    #undef COMPENSATE_FORMULA
33    
34  #include <stdio.h>  #include <stdio.h>
35  #include <math.h>  #include <math.h>
36    #include <limits.h>
 #define RAD2DEG 57.295779513082320876798154814105  
 #define DEG2RAD 0.017453292519943295769236907684886  
37    
38  #include "../xvid.h"  #include "../xvid.h"
39  #include "../image/image.h"  #include "../image/image.h"
40    
41    /*****************************************************************************
42     * Some constants
43     ****************************************************************************/
44    
45    #define DEFAULT_KEYFRAME_BOOST 0
46    #define DEFAULT_OVERFLOW_CONTROL_STRENGTH 10
47    #define DEFAULT_CURVE_COMPRESSION_HIGH 0
48    #define DEFAULT_CURVE_COMPRESSION_LOW 0
49    #define DEFAULT_MAX_OVERFLOW_IMPROVEMENT 60
50    #define DEFAULT_MAX_OVERFLOW_DEGRADATION 60
51    
52    /* Keyframe settings */
53    #define DEFAULT_KFREDUCTION 20
54    #define DEFAULT_MIN_KEY_INTERVAL 1
55    
56    /*****************************************************************************
57     * Structures
58     ****************************************************************************/
59    
60    /* Statistics */
61  typedef struct {  typedef struct {
62      int type;               /* first pass type */      int type;               /* first pass type */
63      int quant;              /* first pass quant */      int quant;              /* first pass quant */
64            int quant2;             /* Second pass quant */
65          int blks[3];                    /* k,m,y blks */          int blks[3];                    /* k,m,y blks */
66      int length;             /* first pass length */      int length;             /* first pass length */
67      int scaled_length;     /* scaled length */      int scaled_length;     /* scaled length */
68      int desired_length;          int desired_length;     /* desired length; calculated during encoding */
69  } stat_t;          int error;
   
70    
71            int zone_mode;   /* XVID_ZONE_xxx */
72            double weight;
73    } twopass_stat_t;
74    
75    /* Context struct */
 /* context struct */  
76  typedef struct  typedef struct
77  {  {
78      xvid_plugin_2pass2_t param;      xvid_plugin_2pass2_t param;
79    
80      /* constant statistical data */          /*----------------------------------
81             * constant statistical data
82             *--------------------------------*/
83    
84            /* Number of frames of the sequence */
85          int num_frames;          int num_frames;
86    
87            /* Number of Intra frames of the sequence */
88      int num_keyframes;      int num_keyframes;
     uint64_t target;    /* target bitrate */  
89    
90      int count[3];   /* count of each frame types */          /* Target filesize to reach */
91      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;  
92    
93      /* dynamic */          /* Count of each frame types */
94            int count[3];
95    
96      int * keyframe_locations;          /* Total length of each frame types (1st pass) */
97      stat_t * stats;          uint64_t tot_length[3];
98    
99      double pquant_error[32];          /* Average length of each frame types (used first for 1st pass data and
100      double bquant_error[32];           * then for scaled averages */
101      int quant_count[32];          double avg_length[3];
102      int last_quant[3];  
103            /* Minimum frame length allowed for each frame type */
104            int min_length[3];
105    
106            /* Total bytes per frame type once the curve has been scaled
107             * NB: advanced parameters do not change this value. This field
108             *     represents the total scaled w/o any advanced settings */
109            uint64_t tot_scaled_length[3];
110    
111            /* Maximum observed frame size observed during the first pass, the RC
112             * will try tp force all frame sizes in the second pass to be under that
113             * limit */
114            int max_length;
115    
116      double curve_comp_error;          /*----------------------------------
117      int overflow;           * Zones statistical data
118      int KFoverflow;           *
119      int KFoverflow_partial;           * ToDo: Fix zones, current
120      int KF_idx;           *       implementation is buggy
121  } rc_2pass2_t;           *--------------------------------*/
122    
123            /* Average weight of the zones */
124            double avg_weight;
125    
126            /* Total length used by XVID_ZONE_QUANT zones */
127            int64_t tot_quant;
128    
129            /*----------------------------------
130             * Advanced settings helper ratios
131             *--------------------------------*/
132    
133            /* This the ratio that has to be applied to all p/b frames in order
134             * to reserve/retrieve bits for/from keyframe boosting and consecutive
135             * keyframe penalty */
136            double pb_iboost_tax_ratio;
137    
138            /* This the ratio to apply to all b/p frames in order to respect the
139             * assymetric curve compression while respecting a target filesize
140             * NB: The assymetric delta gain has to be computed before this ratio
141             *     is applied, and then the delta is added to the scaled size */
142            double assymetric_tax_ratio;
143    
144            /*----------------------------------
145             * Data from the stats file kept
146             * into RAM for easy access
147             *--------------------------------*/
148    
149            /* Array of keyframe locations
150             * eg: rc->keyframe_locations[100] returns the frame number of the 100th
151             *     keyframe */
152            int *keyframe_locations;
153    
154            /* Index of the last keyframe used in the keyframe_location */
155            int KF_idx;
156    
157            /* Array of all 1st pass data file -- see the twopass_stat_t structure
158             * definition for more details */
159            twopass_stat_t * stats;
160    
161            /*----------------------------------
162             * Histerysis helpers
163             *--------------------------------*/
164    
165            /* This field holds the int2float conversion errors of each quant per
166             * frame type, this allow the RC to keep track of rouding error and thus
167             * increase or decrease the chosen quant according to this residue */
168            double quant_error[3][32];
169    
170            /* This fields stores the count of each quant usage per frame type
171             * No real role but for debugging */
172            int quant_count[3][32];
173    
174            /* Last valid quantizer used per frame type, it allows quantizer
175             * increament/decreament limitation in order to avoid big image quality
176             * "jumps" */
177            int last_quant[3];
178    
179  #define BUF_SZ 1024          /*----------------------------------
180  #define MAX_COLS    5           * Overflow control
181             *--------------------------------*/
182    
183            /* Current overflow that has to be distributed to p/b frames */
184            double overflow;
185    
186            /* Total overflow for keyframes -- not distributed directly */
187            double KFoverflow;
188    
189            /* Amount of keyframe overflow to introduce to the global p/b frame
190             * overflow counter at each encoded frame */
191            double KFoverflow_partial;
192    
193            /* Unknown ???
194             * ToDo: description */
195            double fq_error;
196    
197            /*----------------------------------
198             * Debug
199             *--------------------------------*/
200            double desired_total;
201            double real_total;
202    } rc_2pass2_t;
203    
204    
205  /* open stats file, and count num frames */  /*****************************************************************************
206     * Sub plugin functions prototypes
207     ****************************************************************************/
208    
209    static int rc_2pass2_create(xvid_plg_create_t * create, rc_2pass2_t ** handle);
210    static int rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data);
211    static int rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data);
212    static int rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy);
213    
214    /*****************************************************************************
215     * Plugin definition
216     ****************************************************************************/
217    
218  static int det_stats_length(rc_2pass2_t * rc, char * filename)  int
219    xvid_plugin_2pass2(void * handle, int opt, void * param1, void * param2)
220  {  {
221      FILE * f;          switch(opt) {
222      int n, ignore;          case XVID_PLG_INFO :
223      char type;                  return 0;
224    
225      rc->num_frames = 0;          case XVID_PLG_CREATE :
226      rc->num_keyframes = 0;                  return rc_2pass2_create((xvid_plg_create_t*)param1, param2);
227    
228      if ((f = fopen(filename, "rt")) == NULL)          case XVID_PLG_DESTROY :
229          return 0;                  return rc_2pass2_destroy((rc_2pass2_t*)handle, (xvid_plg_destroy_t*)param1);
230    
231      while((n = fscanf(f, "%c %d %d %d %d %d %d\n",          case XVID_PLG_BEFORE :
232          &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++;  
         }  
     }  
233    
234      fclose(f);          case XVID_PLG_AFTER :
235                    return rc_2pass2_after((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);
236            }
237    
238      return 1;          return XVID_ERR_FAIL;
239  }  }
240    
241    /*****************************************************************************
242     * Sub plugin functions definitions
243     ****************************************************************************/
244    
245    /* First a few local helping function prototypes */
246    static  int statsfile_count_frames(rc_2pass2_t * rc, char * filename);
247    static  int statsfile_load(rc_2pass2_t *rc, char * filename);
248    static void zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create);
249    static void first_pass_stats_prepare_data(rc_2pass2_t * rc);
250    static void first_pass_scale_curve_internal(rc_2pass2_t *rc);
251    static void scaled_curve_apply_advanced_parameters(rc_2pass2_t * rc);
252    #if 0
253    static void stats_print(rc_2pass2_t * rc);
254    #endif
255    
256  /* scale the curve */  /*----------------------------------------------------------------------------
257     *--------------------------------------------------------------------------*/
258    
259  static void internal_scale(rc_2pass2_t *rc)  static int
260    rc_2pass2_create(xvid_plg_create_t * create, rc_2pass2_t **handle)
261  {  {
262          int64_t target  = rc->target;          xvid_plugin_2pass2_t * param = (xvid_plugin_2pass2_t *)create->param;
263          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;  
264          int i;          int i;
265    
266          if (target <= 0 || target >= tot_length) {          rc = malloc(sizeof(rc_2pass2_t));
267                  printf("undersize warning\n");          if (rc == NULL)
268          }                  return XVID_ERR_MEMORY;
269    
270          /* perform an initial scale pass.          rc->param = *param;
            if a frame size is scaled underneath our hardcoded minimums, then we force the  
            frame size to the minimum, and deduct the original & scaled frmae length from the  
            original and target total lengths */  
271    
272          min_size[0] = ((rc->stats[0].blks[0]*22) + 240) / 8;          /* Initialize all defaults */
273          min_size[1] = (rc->stats[0].blks[0] + 88) / 8;  #define _INIT(a, b) if((a) <= 0) (a) = (b)
274          min_size[2] = 8;          /* Let's set our defaults if needed */
275            _INIT(rc->param.keyframe_boost, DEFAULT_KEYFRAME_BOOST);
276            _INIT(rc->param.overflow_control_strength, DEFAULT_OVERFLOW_CONTROL_STRENGTH);
277            _INIT(rc->param.curve_compression_high, DEFAULT_CURVE_COMPRESSION_HIGH);
278            _INIT(rc->param.curve_compression_low, DEFAULT_CURVE_COMPRESSION_LOW);
279            _INIT(rc->param.max_overflow_improvement, DEFAULT_MAX_OVERFLOW_IMPROVEMENT);
280            _INIT(rc->param.max_overflow_degradation,  DEFAULT_MAX_OVERFLOW_DEGRADATION);
281    
282            /* Keyframe settings */
283            _INIT(rc->param.kfreduction, DEFAULT_KFREDUCTION);
284            _INIT(rc->param.min_key_interval, DEFAULT_MIN_KEY_INTERVAL);
285    #undef _INIT
286    
287            /* Initialize some stuff to zero */
288            for(i=0; i<3; i++) {
289                    int j;
290                    for (j=0; j<32; j++) {
291                            rc->quant_error[i][j] = 0;
292                            rc->quant_count[i][j] = 0;
293                    }
294            }
295    
296          scaler = (double)target / (double)tot_length;          for (i=0; i<3; i++) rc->last_quant[i] = 0;
         //printf("target=%i, tot_length=%i, scaler=%f\n", (int)target, (int)tot_length, scaler);  
297    
298          for (i=0; i<rc->num_frames; i++) {          rc->fq_error = 0;
                 stat_t * s = &rc->stats[i];  
                 int len;  
299    
300                  len = (int)((double)s->length * scaler);          /* Count frames (and intra frames) in the stats file, store the result into
301                  if (len < min_size[s->type]) {          /* force frame size */           * the rc structure */
302                          s->scaled_length = min_size[s->type];          if (statsfile_count_frames(rc, param->filename) == -1) {
303                          target -= s->scaled_length;                  DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- ERROR: fopen %s failed\n", param->filename);
304                          tot_length -= s->length;                  free(rc);
305                  }else{                  return(XVID_ERR_FAIL);
                         s->scaled_length = 0;  
306                  }                  }
307    
308            /* Allocate the stats' memory */
309            if ((rc->stats = malloc(rc->num_frames * sizeof(twopass_stat_t))) == NULL) {
310                    free(rc);
311                    return(XVID_ERR_MEMORY);
312          }          }
313    
314          if (target <= 0 || target >= tot_length) {          /* Allocate keyframes location's memory
315                  printf("undersize warning\n");           * PS: see comment in pre_process0 for the +1 location requirement */
316                  return;          rc->keyframe_locations = malloc((rc->num_keyframes + 1) * sizeof(int));
317            if (rc->keyframe_locations == NULL) {
318                    free(rc->stats);
319                    free(rc);
320                    return(XVID_ERR_MEMORY);
321            }
322    
323            /* Load the first pass stats */
324            if (statsfile_load(rc, param->filename) == -1) {
325                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- ERROR: fopen %s failed\n", param->filename);
326                    free(rc->keyframe_locations);
327                    free(rc->stats);
328                    free(rc);
329                    return XVID_ERR_FAIL;
330          }          }
331    
332          scaler = (double)target / (double)tot_length;          /* Compute the target filesize */
333          //printf("target=%i, tot_length=%i, scaler=%f\n", (int)target, (int)tot_length, scaler);          if (rc->param.bitrate<0) {
334                    /* if negative, bitrate equals the target (in kbytes) */
335                    rc->target = (-rc->param.bitrate) * 1024;
336            } else if (rc->num_frames  < create->fbase/create->fincr) {
337                    /* Source sequence is less than 1s long, we do as if it was 1s long */
338                    rc->target = rc->param.bitrate / 8;
339            } else {
340                    /* Target filesize = bitrate/8 * numframes / framerate */
341                    rc->target =
342                            ((uint64_t)rc->param.bitrate * (uint64_t)rc->num_frames * \
343                             (uint64_t)create->fincr) / \
344                            ((uint64_t)create->fbase * 8);
345            }
346    
347            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Frame rate: %d/%d (%ffps)\n",
348                            create->fbase, create->fincr,
349                            (double)create->fbase/(double)create->fincr);
350            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Number of frames: %d\n", rc->num_frames);
351            if(rc->param.bitrate>=0)
352                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Target bitrate: %ld\n", rc->param.bitrate);
353            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Target filesize: %lld\n", rc->target);
354    
355            /* Compensate the average frame overhead caused by the container */
356            rc->target -= rc->num_frames*rc->param.container_frame_overhead;
357            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Container Frame overhead: %d\n", rc->param.container_frame_overhead);
358            if(rc->param.container_frame_overhead)
359                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- New target filesize after container compensation: %lld\n", rc->target);
360    
361            /* Gathers some information about first pass stats:
362             *  - finds the minimum frame length for each frame type during 1st pass.
363             *     rc->min_size[]
364             *  - determines the maximum frame length observed (no frame type distinction).
365             *     rc->max_size
366             *  - count how many times each frame type has been used.
367             *     rc->count[]
368             *  - total bytes used per frame type
369             *     rc->total[]
370             *  - store keyframe location
371             *     rc->keyframe_locations[]
372             */
373            first_pass_stats_prepare_data(rc);
374    
375            /* When bitrate is not given it means it has been scaled by an external
376             * application */
377            if (rc->param.bitrate) {
378                    /* Apply zone settings */
379                    zone_process(rc, create);
380                    /* Perform internal curve scaling */
381                    first_pass_scale_curve_internal(rc);
382            } else {
383                    /* External scaling -- zones are ignored */
384          for (i=0; i<rc->num_frames; i++) {          for (i=0; i<rc->num_frames; i++) {
385                  stat_t * s = &rc->stats[i];                          rc->stats[i].zone_mode = XVID_ZONE_WEIGHT;
386                            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);  
387                  }                  }
388                    rc->avg_weight = 1.0;
389                    rc->tot_quant = 0;
390          }          }
391    
392            /* Apply advanced curve options, and compute some parameters in order to
393             * shape the curve in the BEFORE/AFTER pair of functions */
394            scaled_curve_apply_advanced_parameters(rc);
395    
396            *handle = rc;
397            return(0);
398  }  }
399    
400    /*----------------------------------------------------------------------------
401     *--------------------------------------------------------------------------*/
402    
403    static int
404    rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy)
405    {
406            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- target_total:%lld desired_total:%.2f (%.2f%%) actual_total:%.2f (%.2f%%)\n",
407                            rc->target,
408                            rc->desired_total,
409                            100*rc->desired_total/(double)rc->target,
410                            rc->real_total,
411                            100*rc->real_total/(double)rc->target);
412    
413            free(rc->keyframe_locations);
414            free(rc->stats);
415            free(rc);
416            return(0);
417    }
418    
419    /*----------------------------------------------------------------------------
420     *--------------------------------------------------------------------------*/
421    
422  /* static void internal_scale(rc_2pass2_t *rc)  static int
423    rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)
424  {  {
425      const double avg_pvop = rc->avg_length[XVID_TYPE_PVOP-1];          twopass_stat_t * s = &rc->stats[data->frame_num];
426      const double avg_bvop = rc->avg_length[XVID_TYPE_BVOP-1];          double dbytes;
427      const uint64_t tot_pvop = rc->tot_length[XVID_TYPE_PVOP-1];          double scaled_quant;
428      const uint64_t tot_bvop = rc->tot_length[XVID_TYPE_BVOP-1];          double overflow;
429      uint64_t i_total = 0;          int capped_to_max_framesize = 0;
         double total1,total2;  
     int i;  
   
     for (i=0; i<rc->num_frames; i++) {  
         stat_t * s = &rc->stats[i];  
   
                 if (s->type == XVID_TYPE_IVOP) {  
                         i_total += s->length + s->length * rc->param.keyframe_boost / 100;  
         }  
         }  
430    
431          // compensate for avi frame overhead          /* This function is quite long but easy to understand. In order to simplify
432          rc->target_size -= rc->num_frames * 24;           * the code path (a bit), we treat 3 cases that can return immediatly. */
433    
434          // perform prepass to compensate for over/undersizing          /* First case: Another plugin has already set a quantizer */
435            if (data->quant > 0)
436                    return(0);
437    
438          if (rc->param.use_alt_curve) {          /* Second case: We are in a Quant zone */
439            if (s->zone_mode == XVID_ZONE_QUANT) {
440                    rc->fq_error += s->weight;
441                    data->quant = (int)rc->fq_error;
442                    rc->fq_error -= data->quant;
443    
444          rc->alt_curve_low = avg_pvop - avg_pvop * (double)rc->param.alt_curve_low_dist / 100.0;                  s->desired_length = s->length;
                 rc->alt_curve_low_diff = avg_pvop - rc->alt_curve_low;  
                 rc->alt_curve_high = avg_pvop + avg_pvop * (double)rc->param.alt_curve_high_dist / 100.0;  
                 rc->alt_curve_high_diff = rc->alt_curve_high - avg_pvop;  
                 if (rc->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;  
             }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;  
445    
446                  if (rc->param.alt_curve_low_dist > 100) {                  return(0);
                         switch(rc->param.alt_curve_type) {  
                         case XVID_CURVE_SINE : // Sine Curve (high aggressiveness)  
                                 rc->alt_curve_qual_dev *= 2.0 / (1.0 + sin(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff)));  
                                 rc->alt_curve_mid_qual = 1.0 - rc->alt_curve_qual_dev * sin(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff));  
                                 break;  
                         case XVID_CURVE_LINEAR : // Linear (medium aggressiveness)  
                                 rc->alt_curve_qual_dev *= 2.0 / (1.0 + avg_pvop / rc->alt_curve_low_diff);  
                                 rc->alt_curve_mid_qual = 1.0 - rc->alt_curve_qual_dev * avg_pvop / rc->alt_curve_low_diff;  
                                 break;  
                         case XVID_CURVE_COSINE : // Cosine Curve (low aggressiveness)  
                                 rc->alt_curve_qual_dev *= 2.0 / (1.0 +  (1.0 - cos(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff))));  
                                 rc->alt_curve_mid_qual = 1.0 - rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff)));  
                         }  
                 }  
447          }          }
448    
449          total1 = 0;          /* Third case: insufficent stats data */
450          total2 = 0;          if (data->frame_num >= rc->num_frames)
451                    return(0);
452    
453      for (i=0; i<rc->num_frames; i++) {          /*************************************************************************/
454          stat_t * s = &rc->stats[i];          /*************************************************************************/
455            /*************************************************************************/
456    
457                  if (s->type != XVID_TYPE_IVOP) {          /*-------------------------------------------------------------------------
458             * Frame bit allocation first part
459             *
460             * First steps apply user settings, just like it is done in the theoritical
461             * scaled_curve_apply_advanced_parameters
462             *-----------------------------------------------------------------------*/
463    
464              double dbytes = s->length / rc->movie_curve;          /* Set desired to what we are wanting to obtain for this frame */
465              double dbytes2;          dbytes = (double)s->scaled_length;
                         total1 += dbytes;  
   
                         if (s->type == XVID_TYPE_BVOP)  
                                 dbytes *= avg_pvop / avg_bvop;  
   
                         if (rc->param.use_alt_curve) {  
                                 if (dbytes > avg_pvop) {  
                     if (dbytes >= rc->alt_curve_high) {  
                                                 dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev);  
                     }else{  
                                                 switch(rc->param.alt_curve_type){  
                                                 case XVID_CURVE_SINE :  
                                                     dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * sin(DEG2RAD * ((dbytes - avg_pvop) * 90.0 / rc->alt_curve_high_diff)));  
                                                         break;  
                                                 case XVID_CURVE_LINEAR :  
                                                     dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - avg_pvop) / rc->alt_curve_high_diff);  
                                                         break;  
                                                 case XVID_CURVE_COSINE :  
                                                     dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * ((dbytes - avg_pvop) * 90.0 / rc->alt_curve_high_diff))));  
                                                 }  
                                         }  
                                 }else{  
                     if (dbytes <= rc->alt_curve_low){  
                                                 dbytes2 = dbytes;  
                     }else{  
                                                 switch(rc->param.alt_curve_type){  
                                                 case XVID_CURVE_SINE :  
                                                     dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * sin(DEG2RAD * ((dbytes - avg_pvop) * 90.0 / rc->alt_curve_low_diff)));  
                                                         break;  
                                                 case XVID_CURVE_LINEAR :  
                                                     dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - avg_pvop) / rc->alt_curve_low_diff);  
                                                         break;  
                                                 case XVID_CURVE_COSINE :  
                                                     dbytes2 = dbytes * (rc->alt_curve_mid_qual + rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * ((dbytes - 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);  
                                 }  
                         }  
466    
467                          if (s->type == XVID_TYPE_BVOP) {          /* IFrame user settings*/
468                                  dbytes2 *= avg_bvop / avg_pvop;          if (s->type == XVID_TYPE_IVOP) {
             }  
469    
470              if (dbytes2 < rc->min_length[s->type-1]) {                  /* Keyframe boosting -- All keyframes benefit from it */
471                  dbytes = rc->min_length[s->type-1];                  dbytes += dbytes*rc->param.keyframe_boost / 100;
             }  
472    
473              total2 += dbytes2;                  /* Applies keyframe penalties, but not the first frame */
474                  }                  if (rc->KF_idx) {
475          }                          int penalty_distance;
476    
477          rc->curve_comp_scale = total1 / total2;                          /* Minimum keyframe distance penalties */
478                            penalty_distance  = rc->param.min_key_interval;
479                            penalty_distance -= rc->keyframe_locations[rc->KF_idx];
480                            penalty_distance += rc->keyframe_locations[rc->KF_idx-1];
481    
482          if (!rc->param.use_alt_curve) {                          /* Ah ah ! guilty keyframe, you're under arrest ! */
483                  printf("middle frame size for asymmetric curve compression: %i",                          if (penalty_distance > 0)
484              (int)(avg_pvop * rc->curve_comp_scale));                                  dbytes -= dbytes*penalty_distance*rc->param.kfreduction/100;
485          }          }
486  }*/          } else {
487    
488                    /* P/S/B frames must reserve some bits for iframe boosting */
489                    dbytes *= rc->pb_iboost_tax_ratio;
490    
491                    /* Apply assymetric curve compression */
492                    if (rc->param.curve_compression_high || rc->param.curve_compression_low) {
493                            double assymetric_delta;
494    
495  /* open stats file(s) and read into rc->stats array */                          /* Compute the assymetric delta, this is computed before applying
496                             * the tax, as done in the pre_process function */
497                            if (dbytes > rc->avg_length[s->type-1])
498                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_high / 100.0;
499                            else
500                                    assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_low  / 100.0;
501    
502  static int load_stats(rc_2pass2_t *rc, char * filename)                          /* Now we must apply the assymetric tax, else our curve compression
503  {                           * would not give a theoritical target size equal to what it is
504      FILE * f;                           * expected */
505      int i, not_scaled;                          dbytes *= rc->assymetric_tax_ratio;
506    
507                            /* Now we can add the assymetric delta */
508                            dbytes += assymetric_delta;
509                    }
510            }
511    
512      if ((f = fopen(filename, "rt"))==NULL)          /* That is what we would like to have -- Don't put that chunk after
513          return 0;           * overflow control, otherwise, overflow is counted twice and you obtain
514             * half sized bitrate sequences */
515            s->desired_length  = (int)dbytes;
516            rc->desired_total += dbytes;
517    
518      i = 0;          /*------------------------------------------------------------------------
519          not_scaled = 0;           * Frame bit allocation: overflow control part.
520      while(i < rc->num_frames) {           *
521          stat_t * s = &rc->stats[i];           * Unlike the theoritical scaled_curve_apply_advanced_parameters, here
522          int n;           * it's real encoding and we need to make sure we don't go so far from
523          char type;           * what is our ideal scaled curve.
524             *-----------------------------------------------------------------------*/
525    
526                  s->scaled_length = 0;          /* Compute the overflow we should compensate */
527          n = fscanf(f, "%c %d %d %d %d %d %d\n", &type, &s->quant, &s->blks[0], &s->blks[1], &s->blks[2], &s->length, &s->scaled_length);          if (s->type != XVID_TYPE_IVOP) {
528          if (n == EOF) break;                  double frametype_factor;
529                  if (n < 7) {                  double framesize_factor;
                         not_scaled = 1;  
                 }  
530    
531          if (type == 'i') {                  /* Take only the desired part of overflow */
532              s->type = XVID_TYPE_IVOP;                  overflow = rc->overflow;
         }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;  
         }  
533    
534          i++;                  /* Factor that will take care to decrease the overflow applied
535                     * according to the importance of this frame type in term of
536                     * overall size */
537                    frametype_factor  = rc->count[XVID_TYPE_IVOP-1]*rc->avg_length[XVID_TYPE_IVOP-1];
538                    frametype_factor += rc->count[XVID_TYPE_PVOP-1]*rc->avg_length[XVID_TYPE_PVOP-1];
539                    frametype_factor += rc->count[XVID_TYPE_BVOP-1]*rc->avg_length[XVID_TYPE_BVOP-1];
540                    frametype_factor /= rc->count[s->type-1]*rc->avg_length[s->type-1];
541                    frametype_factor  = 1/frametype_factor;
542    
543                    /* Factor that will take care not to compensate too much for this frame
544                     * size */
545                    framesize_factor  = dbytes;
546                    framesize_factor /= rc->avg_length[s->type-1];
547    
548                    /* Treat only the overflow part concerned by this frame type and size */
549                    overflow *= frametype_factor;
550    #if 0
551                    /* Leave this one alone, as it impacts badly on quality */
552                    overflow *= framesize_factor;
553    #endif
554    
555                    /* Apply the overflow strength imposed by the user */
556                    overflow *= (rc->param.overflow_control_strength/100.0f);
557            } else {
558                    /* no overflow applied in IFrames because:
559                     *  - their role is important as they're references for P/BFrames.
560                     *  - there aren't much in typical sequences, so if an IFrame overflows too
561                     *    much, this overflow may impact the next IFrame too much and generate
562                     *    a sequence of poor quality frames */
563                    overflow = 0;
564      }      }
     rc->num_frames = i;  
565    
566      fclose(f);          /* Make sure we are not trying to compensate more overflow than we even have */
567            if (fabs(overflow) > fabs(rc->overflow))
568                    overflow = rc->overflow;
569    
570      return 1;          /* Make sure the overflow doesn't make the frame size to get out of the range
571             * [-max_degradation..+max_improvment] */
572            if (overflow > dbytes*rc->param.max_overflow_improvement / 100) {
573                    if(overflow <= dbytes)
574                            dbytes += dbytes * rc->param.max_overflow_improvement / 100;
575                    else
576                            dbytes += overflow * rc->param.max_overflow_improvement / 100;
577            } else if (overflow < - dbytes * rc->param.max_overflow_degradation / 100) {
578                    dbytes -= dbytes * rc->param.max_overflow_degradation / 100;
579            } else {
580                    dbytes += overflow;
581  }  }
582    
583            /*-------------------------------------------------------------------------
584             * Frame bit allocation last part:
585             *
586             * Cap frame length so we don't reach neither bigger frame sizes than first
587             * pass nor smaller than the allowed minimum.
588             *-----------------------------------------------------------------------*/
589    
590            if (dbytes > s->length) {
591                    dbytes = s->length;
592            } else if (dbytes < rc->min_length[s->type-1]) {
593                    dbytes = rc->min_length[s->type-1];
594            } else if (dbytes > rc->max_length) {
595                    /* ToDo: this condition is always wrong as max_length == maximum frame
596                     * length of first pass, so the first condition already caps the frame
597                     * size... */
598                    capped_to_max_framesize = 1;
599                    dbytes = rc->max_length;
600                    DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- frame:%d Capped to maximum frame size\n",
601                                    data->frame_num);
602            }
603    
604            /*------------------------------------------------------------------------
605             * Desired frame length <-> quantizer mapping
606             *-----------------------------------------------------------------------*/
607    
608            /* For bframes we must retrieve the original quant used (sent to xvidcore)
609             * as core applies the bquant formula before writing the stat log entry */
610            if(s->type == XVID_TYPE_BVOP) {
611    
612                    twopass_stat_t *b_ref = s;
613    
614  static void print_stats(rc_2pass2_t * rc)                  /* Find the reference frame */
615  {                  while(b_ref != &rc->stats[0] && b_ref->type == XVID_TYPE_BVOP)
616      int i;                          b_ref--;
     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);  
617    
618      }                  /* Compute the original quant */
619                    s->quant  = 100*s->quant - data->bquant_offset;
620                    s->quant += data->bquant_ratio - 1; /* to avoid rouding issues */
621                    s->quant  = s->quant/data->bquant_ratio - b_ref->quant;
622  }  }
623    
624            /* Don't laugh at this very 'simple' quant<->filesize relationship, it
625             * proves to be acurate enough for our algorithm */
626            scaled_quant = (double)s->quant*(double)s->length/(double)dbytes;
627    
628  /* pre-process the statistics data  #ifdef COMPENSATE_FORMULA
629      this is a clone of vfw/src/2pass.c:codec_2pass_init minus file reading, alt_curve, internal scale          /* We know xvidcore will apply the bframe formula again, so we compensate
630  */           * it right now to make sure we would not apply it twice */
631            if(s->type == XVID_TYPE_BVOP) {
632    
633  void pre_process0(rc_2pass2_t * rc)                  twopass_stat_t *b_ref = s;
 {  
     int i,j;  
634    
635      for (i=0; i<3; i++) {                  /* Find the reference frame */
636          rc->count[i]=0;                  while(b_ref != &rc->stats[0] && b_ref->type == XVID_TYPE_BVOP)
637          rc->tot_length[i] = 0;                          b_ref--;
         rc->last_quant[i] = 0;  
     }  
638    
639      for (i=0; i<32;i++) {                  /* Compute the quant it would be if the core did not apply the bframe
640          rc->pquant_error[i] = 0;                   * formula */
641          rc->bquant_error[i] = 0;                  scaled_quant  = 100*scaled_quant - data->bquant_offset;
642          rc->quant_count[i] = 0;                  scaled_quant += data->bquant_ratio - 1; /* to avoid rouding issues */
643                    scaled_quant /= data->bquant_ratio;
644      }      }
645    #endif
646    
647      for (i=j=0; i<rc->num_frames; i++) {          /* Quantizer has been scaled using floating point operations/results, we
648          stat_t * s = &rc->stats[i];           * must cast it to integer */
649            data->quant = (int)scaled_quant;
650    
651          rc->count[s->type-1]++;          /* Let's clip the computed quantizer, if needed */
652          rc->tot_length[s->type-1] += s->length;          if (data->quant < 1) {
653                    data->quant = 1;
654            } else if (data->quant > 31) {
655                    data->quant = 31;
656            } else {
657    
658          if (i == 0 || s->length < rc->min_length[s->type-1]) {                  /* The frame quantizer has not been clipped, this appears to be a good
659              rc->min_length[s->type-1] = s->length;                   * computed quantizer, do not loose quantizer decimal part that we
660          }                   * accumulate for later reuse when its sum represents a complete
661                     * unit. */
662                    rc->quant_error[s->type-1][data->quant] += scaled_quant - (double)data->quant;
663    
664          if (i == 0 || s->length > rc->max_length) {                  if (rc->quant_error[s->type-1][data->quant] >= 1.0) {
665              rc->max_length = s->length;                          rc->quant_error[s->type-1][data->quant] -= 1.0;
666                            data->quant++;
667                    } else if (rc->quant_error[s->type-1][data->quant] <= -1.0) {
668                            rc->quant_error[s->type-1][data->quant] += 1.0;
669                            data->quant--;
670                    }
671          }          }
672    
673          if (s->type == XVID_TYPE_IVOP) {          /* Now we have a computed quant that is in the right quante range, with a
674              rc->keyframe_locations[j] = i;           * possible +1 correction due to cumulated error. We can now safely clip
675              j++;           * the quantizer again with user's quant ranges. "Safely" means the Rate
676             * Control could learn more about this quantizer, this knowledge is useful
677             * for future frames even if it this quantizer won't be really used atm,
678             * that's why we don't perform this clipping earlier. */
679            if (data->quant < data->min_quant[s->type-1]) {
680                    data->quant = data->min_quant[s->type-1];
681            } else if (data->quant > data->max_quant[s->type-1]) {
682                    data->quant = data->max_quant[s->type-1];
683            }
684    
685            /* To avoid big quality jumps from frame to frame, we apply a "security"
686             * rule that makes |last_quant - new_quant| <= 2. This rule only applies
687             * to predicted frames (P and B) */
688            if (s->type != XVID_TYPE_IVOP && rc->last_quant[s->type-1] && capped_to_max_framesize == 0) {
689    
690                    if (data->quant > rc->last_quant[s->type-1] + 2) {
691                            data->quant = rc->last_quant[s->type-1] + 2;
692                            DPRINTF(XVID_DEBUG_RC,
693                                            "[xvid rc] -- frame %d p/b-frame quantizer prevented from rising too steeply\n",
694                                            data->frame_num);
695          }          }
696                    if (data->quant < rc->last_quant[s->type-1] - 2) {
697                            data->quant = rc->last_quant[s->type-1] - 2;
698                            DPRINTF(XVID_DEBUG_RC,
699                                            "[xvid rc] -- frame:%d p/b-frame quantizer prevented from falling too steeply\n",
700                                            data->frame_num);
701      }      }
     rc->keyframe_locations[j] = i;  
702  }  }
703    
704            /* We don't want to pollute the RC histerisis when our computed quant has
705             * been computed from a capped frame size */
706            if (capped_to_max_framesize == 0)
707                    rc->last_quant[s->type-1] = data->quant;
708    
709            /* Don't forget to force 1st pass frame type ;-) */
710            data->type = s->type;
711    
712  void pre_process1(rc_2pass2_t * rc)          /* Store the quantizer into the statistics -- Used to compensate the double
713  {           * formula symptom */
714      int i;          s->quant2 = data->quant;
     double total1, total2;  
     uint64_t ivop_boost_total;  
   
     ivop_boost_total = 0;  
     rc->curve_comp_error = 0;  
715    
716      for (i=0; i<3; i++) {          return 0;
         rc->tot_scaled_length[i] = 0;  
717      }      }
718    
719      for (i=0; i<rc->num_frames; i++) {  /*----------------------------------------------------------------------------
720          stat_t * s = &rc->stats[i];   *--------------------------------------------------------------------------*/
721    
722          rc->tot_scaled_length[s->type-1] += s->scaled_length;  static int
723    rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)
724    {
725            const char frame_type[4] = { 'i', 'p', 'b', 's'};
726            twopass_stat_t * s = &rc->stats[data->frame_num];
727    
728          if (s->type == XVID_TYPE_IVOP) {          /* Insufficent stats data */
729              ivop_boost_total += s->scaled_length * rc->param.keyframe_boost / 100;          if (data->frame_num >= rc->num_frames)
730          }                  return 0;
731    
732            /* Update the quantizer counter */
733            rc->quant_count[s->type-1][data->quant]++;
734    
735            /* Update the frame type overflow */
736            if (data->type == XVID_TYPE_IVOP) {
737                    int kfdiff = 0;
738    
739                    if(rc->KF_idx != rc->num_frames -1) {
740                            kfdiff  = rc->keyframe_locations[rc->KF_idx+1];
741                            kfdiff -= rc->keyframe_locations[rc->KF_idx];
742      }      }
743    
744      rc->movie_curve = ((double)(rc->tot_scaled_length[XVID_TYPE_PVOP-1] + rc->tot_scaled_length[XVID_TYPE_BVOP-1] + ivop_boost_total) /                  /* Flush Keyframe overflow accumulator */
745                                          (rc->tot_scaled_length[XVID_TYPE_PVOP-1] + rc->tot_scaled_length[XVID_TYPE_BVOP-1]));                  rc->overflow += rc->KFoverflow;
746    
747      for(i=0; i<3; i++) {                  /* Store the frame overflow to the keyframe accumulator */
748          if (rc->count[i] == 0 || rc->movie_curve == 0) {                  rc->KFoverflow = s->desired_length - data->length;
749              rc->avg_length[i] = 1;  
750                    if (kfdiff > 1) {
751                            /* Non-consecutive keyframes case:
752                             * We can then divide this total keyframe overflow into equal parts
753                             * that we will distribute into regular overflow at each frame
754                             * between the sequence bounded by two IFrames */
755                            rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);
756          }else{          }else{
757              rc->avg_length[i] = rc->tot_scaled_length[i] / rc->count[i] / rc->movie_curve;                          /* Consecutive keyframes case:
758          }                           * Flush immediatly the keyframe overflow and reset keyframe
759                             * overflow */
760                            rc->overflow += rc->KFoverflow;
761                            rc->KFoverflow = 0;
762                            rc->KFoverflow_partial = 0;
763      }      }
764                    rc->KF_idx++;
765            } else {
766                    /* Accumulate the frame overflow */
767                    rc->overflow += s->desired_length - data->length;
768    
769      /* alt curve stuff here */                  /* Distribute part of the keyframe overflow */
770                    rc->overflow += rc->KFoverflow_partial;
771    
772      if (rc->param.use_alt_curve) {                  /* Don't forget to substract that same amount from the total keyframe
773          const double avg_pvop = rc->avg_length[XVID_TYPE_PVOP-1];                   * overflow */
774          const uint64_t tot_pvop = rc->tot_length[XVID_TYPE_PVOP-1];                  rc->KFoverflow -= rc->KFoverflow_partial;
775          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];  
776    
777                  rc->alt_curve_low = avg_pvop - avg_pvop * (double)rc->param.alt_curve_low_dist / 100.0;          rc->overflow += s->error = s->desired_length - data->length;
778                  rc->alt_curve_low_diff = avg_pvop - rc->alt_curve_low;          rc->real_total += data->length;
                 rc->alt_curve_high = avg_pvop + avg_pvop * (double)rc->param.alt_curve_high_dist / 100.0;  
                 rc->alt_curve_high_diff = rc->alt_curve_high - avg_pvop;  
779    
780          if (rc->param.alt_curve_use_auto) {          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- frame:%d type:%c quant:%d stats:%d scaled:%d desired:%d actual:%d error:%d overflow:%.2f\n",
781              if (tot_bvop + tot_pvop > tot_scaled_bvop + tot_scaled_pvop) {                          data->frame_num,
782                                  rc->param.alt_curve_min_rel_qual = (int)(100.0 - (100.0 - 100.0 /                          frame_type[data->type-1],
783                                          ((double)(tot_pvop + tot_bvop) / (double)(tot_scaled_pvop + tot_scaled_bvop))) * (double)rc->param.alt_curve_auto_str / 100.0);                          data->quant,
784                            s->length,
785                            s->scaled_length,
786                            s->desired_length,
787                            s->desired_length - s->error,
788                            -s->error,
789                            rc->overflow);
790    
791                                  if (rc->param.alt_curve_min_rel_qual < 20)          return(0);
                                         rc->param.alt_curve_min_rel_qual = 20;  
             }else{  
                                 rc->param.alt_curve_min_rel_qual = 100;  
             }  
792          }          }
                 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;  
793    
794          if (rc->param.alt_curve_low_dist > 100) {  /*****************************************************************************
795                          switch(rc->param.alt_curve_type) {   * Helper functions definition
796              case XVID_CURVE_SINE: // Sine Curve (high aggressiveness)   ****************************************************************************/
                                 rc->alt_curve_qual_dev *= 2.0 / (1.0 + sin(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff)));  
                                 rc->alt_curve_mid_qual = 1.0 - rc->alt_curve_qual_dev * sin(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff));  
                                 break;  
                         case XVID_CURVE_LINEAR: // Linear (medium aggressiveness)  
                                 rc->alt_curve_qual_dev *= 2.0 / (1.0 + avg_pvop / rc->alt_curve_low_diff);  
                                 rc->alt_curve_mid_qual = 1.0 - rc->alt_curve_qual_dev * avg_pvop / rc->alt_curve_low_diff;  
                                 break;  
                         case XVID_CURVE_COSINE: // Cosine Curve (low aggressiveness)  
                                 rc->alt_curve_qual_dev *= 2.0 / (1.0 + (1.0 - cos(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff))));  
                                 rc->alt_curve_mid_qual = 1.0 - rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * (avg_pvop * 90.0 / rc->alt_curve_low_diff)));  
                         }  
                 }  
     }  
     /* --- */  
797    
798    /* Default buffer size for reading lines */
799    #define BUF_SZ   1024
800    
801      total1=total2=0;  /* Helper functions for reading/parsing the stats file */
802      for (i=0; i<rc->num_frames; i++) {  static char *skipspaces(char *string);
803          stat_t * s = &rc->stats[i];  static int iscomment(char *string);
804    static char *readline(FILE *f);
805    
806    /* This function counts the number of frame entries in the stats file
807     * It also counts the number of I Frames */
808    static int
809    statsfile_count_frames(rc_2pass2_t * rc, char * filename)
810    {
811            FILE * f;
812            char *line;
813            int lines;
814    
815          if (s->type != XVID_TYPE_IVOP) {          rc->num_frames = 0;
816              double dbytes,dbytes2;          rc->num_keyframes = 0;
817    
818              dbytes = s->scaled_length / rc->movie_curve;          if ((f = fopen(filename, "rb")) == NULL)
819              dbytes2 = 0; /* XXX: warning */                  return(-1);
             total1 += dbytes;  
             if (s->type == XVID_TYPE_BVOP)  
                 dbytes *= rc->avg_length[XVID_TYPE_PVOP-1] / rc->avg_length[XVID_TYPE_BVOP-1];  
820    
821              if (rc->param.use_alt_curve) {          lines = 0;
822                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {          while ((line = readline(f)) != NULL) {
823    
824                      if (dbytes >= rc->alt_curve_high) {                  char *ptr;
825                                                  dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev);                  char type;
826                      }else{                  int fields, nouse;
                                                 switch(rc->param.alt_curve_type) {  
                         case XVID_CURVE_SINE :  
                                                     dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * sin(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_high_diff)));  
                                                         break;  
                         case XVID_CURVE_LINEAR :  
                                                     dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) / rc->alt_curve_high_diff);  
                                                         break;  
                                                 case XVID_CURVE_COSINE :  
                                                     dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_high_diff))));  
                                                 }  
                                         }  
                 }else{  
                     if (dbytes <= rc->alt_curve_low) {  
                                                 dbytes2 = dbytes;  
                     }else{  
                                                 switch(rc->param.alt_curve_type) {  
                                                 case XVID_CURVE_SINE :  
                                                     dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * sin(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_low_diff)));  
                                                         break;  
                                                 case XVID_CURVE_LINEAR :  
                                                     dbytes2 = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) / rc->alt_curve_low_diff);  
                                                         break;  
                                                 case XVID_CURVE_COSINE :  
                                                     dbytes2 = dbytes * (rc->alt_curve_mid_qual + rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_low_diff))));  
                                                 }  
                                         }  
827    
828                  }                  lines++;
829    
830                    /* We skip spaces */
831                    ptr = skipspaces(line);
832    
833              }else{                  /* Skip coment lines */
834                  if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                  if(iscomment(ptr)) {
835                      dbytes2=((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_high / 100.0);                          free(line);
836                  }else{                          continue;
                                 dbytes2 = ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_low / 100.0);  
                 }  
837              }              }
838    
839              if (s->type == XVID_TYPE_BVOP) {                  /* Read the stat line from buffer */
840                              dbytes2 *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];                  fields = sscanf(ptr,
841                              if (dbytes2 < rc->min_length[XVID_TYPE_BVOP-1])                                                  "%c %d %d %d %d %d",
842                                      dbytes2 = rc->min_length[XVID_TYPE_BVOP-1];                                                  &type, &nouse, &nouse, &nouse, &nouse, &nouse);
843              }else{  
844                              if (dbytes2 < rc->min_length[XVID_TYPE_PVOP-1])                  /* Valid stats files have at least 6 fields */
845                                      dbytes2 = rc->min_length[XVID_TYPE_PVOP-1];                  if (fields == 6) {
846                            switch(type) {
847                            case 'i':
848                            case 'I':
849                                    rc->num_keyframes++;
850                            case 'p':
851                            case 'P':
852                            case 'b':
853                            case 'B':
854                            case 's':
855                            case 'S':
856                                    rc->num_frames++;
857                                    break;
858                            default:
859                                    DPRINTF(XVID_DEBUG_RC,
860                                                    "[xvid rc] -- WARNING: L%d unknown frame type used (%c).\n",
861                                                    lines, type);
862              }              }
863              total2 += dbytes2;                  } else {
864                                    DPRINTF(XVID_DEBUG_RC,
865                                                    "[xvid rc] -- WARNING: L%d misses some stat fields (%d).\n",
866                                                    lines, 6-fields);
867          }          }
868    
869                    /* Free the line buffer */
870                    free(line);
871      }      }
872    
873      rc->curve_comp_scale = total1 / total2;          /* We are done with the file */
874            fclose(f);
875    
876      if (!rc->param.use_alt_curve) {          return(0);
         printf("middle frame size for asymmetric curve compression: %i\n",  
             (int)(rc->avg_length[XVID_TYPE_PVOP-1] * rc->curve_comp_scale));  
877      }      }
878    
879      if (rc->param.use_alt_curve) {  /* open stats file(s) and read into rc->stats array */
880          int bonus_bias = rc->param.alt_curve_bonus_bias;  static int
881          int oldquant = 1;  statsfile_load(rc_2pass2_t *rc, char * filename)
882    {
883            FILE * f;
884            int processed_entries;
885    
886            /* Opens the file */
887            if ((f = fopen(filename, "rb"))==NULL)
888                    return(-1);
889    
890              if (rc->param.alt_curve_use_auto_bonus_bias)          processed_entries = 0;
891                      bonus_bias = rc->param.alt_curve_min_rel_qual;          while(processed_entries < rc->num_frames) {
892                    char type;
893                    int fields;
894                    twopass_stat_t * s = &rc->stats[processed_entries];
895                    char *line, *ptr;
896    
897              rc->alt_curve_curve_bias_bonus = (total1 - total2) * (double)bonus_bias / 100.0 / (double)(rc->num_frames /* - credits_frames */ - rc->num_keyframes);                  /* Read the line from the file */
898              rc->curve_comp_scale = ((total1 - total2) * (1.0 - (double)bonus_bias / 100.0) + total2) / total2;                  if((line = readline(f)) == NULL)
899                            break;
900    
901                    /* We skip spaces */
902                    ptr = skipspaces(line);
903    
904          /* special info for alt curve:  bias bonus and quantizer thresholds */                  /* Skip comment lines */
905                    if(iscomment(ptr)) {
906                            free(line);
907                            continue;
908                    }
909    
910                  printf("avg scaled framesize:%i", (int)rc->avg_length[XVID_TYPE_PVOP-1]);                  /* Reset this field that is optional */
911                  printf("bias bonus:%i bytes", (int)rc->alt_curve_curve_bias_bonus);                  s->scaled_length = 0;
912    
913                  for (i=1; i <= (int)(rc->alt_curve_high*2)+1; i++) {                  /* Convert the fields */
914              double curve_temp, dbytes;                  fields = sscanf(ptr,
915              int newquant;                                                  "%c %d %d %d %d %d %d\n",
916                                                    &type,
917                                                    &s->quant,
918                                                    &s->blks[0], &s->blks[1], &s->blks[2],
919                                                    &s->length,
920                                                    &s->scaled_length);
921    
922                    /* Free line buffer, we don't need it anymore */
923                    free(line);
924    
925                    /* Fail silently, this has probably been warned in
926                     * statsfile_count_frames */
927                    if(fields != 6 && fields != 7)
928                            continue;
929    
930              dbytes = i;                  /* Convert frame type */
931                          if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                  switch(type) {
932                  if (dbytes >= rc->alt_curve_high) {                  case 'i':
933                                          curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev);                  case 'I':
934                  }else{                          s->type = XVID_TYPE_IVOP;
                                         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);  
935                                                  break;                                                  break;
936                                          case XVID_CURVE_COSINE :                  case 'p':
937                                                  curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_high_diff))));                  case 'P':
938                                          }                  case 's':
939                                  }                  case 'S':
940                          }else{                          s->type = XVID_TYPE_PVOP;
                 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)));  
941                                                  break;                                                  break;
942                                          case XVID_CURVE_LINEAR :                  case 'b':
943                                                  curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev * (dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) / rc->alt_curve_low_diff);                  case 'B':
944                            s->type = XVID_TYPE_BVOP;
945                                                  break;                                                  break;
946                                          case XVID_CURVE_COSINE :                  default:
947                                                  curve_temp = dbytes * (rc->alt_curve_mid_qual + rc->alt_curve_qual_dev * (1.0 - cos(DEG2RAD * ((dbytes - rc->avg_length[XVID_TYPE_PVOP-1]) * 90.0 / rc->alt_curve_low_diff))));                          /* Same as before, fail silently */
948                                          }                          continue;
                                 }  
949                          }                          }
950    
951                          if (rc->movie_curve > 1.0)                  /* Ok it seems it's been processed correctly */
952                                  dbytes *= rc->movie_curve;                  processed_entries++;
   
                         newquant = (int)(dbytes * 2.0 / (curve_temp * rc->curve_comp_scale + rc->alt_curve_curve_bias_bonus));  
                         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);  
                                 }  
                         }  
953                  }                  }
954    
955      }          /* Close the file */
956            fclose(f);
957    
958      rc->overflow = 0;          return(0);
     rc->KFoverflow = 0;  
     rc->KFoverflow_partial = 0;  
     rc->KF_idx = 1;  
959  }  }
960    
961    /* pre-process the statistics data
962     * - for each type, count, tot_length, min_length, max_length
963     * - set keyframes_locations */
964  static int rc_2pass2_create(xvid_plg_create_t * create, rc_2pass2_t ** handle)  static void
965    first_pass_stats_prepare_data(rc_2pass2_t * rc)
966  {  {
967      xvid_plugin_2pass2_t * param = (xvid_plugin_2pass2_t *)create->param;          int i,j;
     rc_2pass2_t * rc;  
968    
969      rc = malloc(sizeof(rc_2pass2_t));          /* *rc fields initialization
970      if (rc == NULL)           * NB: INT_MAX and INT_MIN are used in order to be immediately replaced
971          return XVID_ERR_MEMORY;           *     with real values of the 1pass */
972            for (i=0; i<3; i++) {
973                    rc->count[i]=0;
974                    rc->tot_length[i] = 0;
975                    rc->min_length[i] = INT_MAX;
976            }
977    
978      rc->param = *param;          rc->max_length = INT_MIN;
979    
980      if (rc->param.keyframe_boost <= 0) rc->param.keyframe_boost = 0;          /* Loop through all frames and find/compute all the stuff this function
981      if (rc->param.payback_method <= 0) rc->param.payback_method = XVID_PAYBACK_PROP;           * is supposed to do */
982      if (rc->param.bitrate_payback_delay <= 0) rc->param.bitrate_payback_delay = 250;          for (i=j=0; i<rc->num_frames; i++) {
983      if (rc->param.curve_compression_high <= 0) rc->param.curve_compression_high = 0;                  twopass_stat_t * s = &rc->stats[i];
     if (rc->param.curve_compression_low <= 0) rc->param.curve_compression_low = 0;  
     if (rc->param.max_overflow_improvement <= 0) rc->param.max_overflow_improvement = 60;  
     if (rc->param.max_overflow_degradation <= 0) rc->param.max_overflow_degradation = 60;  
     if (rc->param.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;  
984    
985      if (!det_stats_length(rc, param->filename)){                  rc->count[s->type-1]++;
986          DPRINTF(DPRINTF_RC,"fopen %s failed\n", param->filename);                  rc->tot_length[s->type-1] += s->length;
         free(rc);  
         return XVID_ERR_FAIL;  
     }  
987    
988      if ((rc->stats = malloc(rc->num_frames * sizeof(stat_t))) == NULL) {                  if (s->length < rc->min_length[s->type-1]) {
989          free(rc);                          rc->min_length[s->type-1] = s->length;
         return XVID_ERR_MEMORY;  
990      }      }
991    
992      /* XXX: do we need an addition location */                  if (s->length > rc->max_length) {
993      if ((rc->keyframe_locations = malloc((rc->num_keyframes + 1) * sizeof(int))) == NULL) {                          rc->max_length = s->length;
         free(rc->stats);  
         free(rc);  
         return XVID_ERR_MEMORY;  
994      }      }
995    
996      if (!load_stats(rc, param->filename)) {                  if (s->type == XVID_TYPE_IVOP) {
997          DPRINTF(DPRINTF_RC,"fopen %s failed\n", param->filename);                          rc->keyframe_locations[j] = i;
998          free(rc->keyframe_locations);                          j++;
         free(rc->stats);  
         free(rc);  
         return XVID_ERR_FAIL;  
999      }      }
   
     /* pre-process our stats */  
   
         {  
                 if (rc->num_frames  < create->fbase/create->fincr) {  
                         rc->target = rc->param.bitrate / 8;     /* one second */  
                 }else{  
                         rc->target = (rc->param.bitrate * rc->num_frames * create->fincr) / (create->fbase * 8);  
1000                  }                  }
1001    
1002            /* NB:
1003             * The "per sequence" overflow system considers a natural sequence to be
1004             * formed by all frames between two iframes, so if we want to make sure
1005             * the system does not go nuts during last sequence, we force the last
1006             * frame to appear in the keyframe locations array. */
1007            rc->keyframe_locations[j] = i;
1008    
1009                  rc->target -= rc->num_frames*24;        /* avi file header */          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Min 1st pass IFrame length: %d\n", rc->min_length[0]);
1010            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Min 1st pass PFrame length: %d\n", rc->min_length[1]);
1011            DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Min 1st pass BFrame length: %d\n", rc->min_length[2]);
1012          }          }
1013    
1014    /* calculate zone weight "center" */
1015    static void
1016    zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)
1017    {
1018            int i,j;
1019            int n = 0;
1020    
1021          pre_process0(rc);          rc->avg_weight = 0.0;
1022          if (rc->param.bitrate) {          rc->tot_quant = 0;
                 internal_scale(rc);  
         }  
         pre_process1(rc);pre_process1(rc);pre_process1(rc);  
   
     *handle = rc;  
         return(0);  
 }  
1023    
1024    
1025  static int rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy)          if (create->num_zones == 0) {
1026  {                  for (j = 0; j < rc->num_frames; j++) {
1027      free(rc->keyframe_locations);                          rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1028      free(rc->stats);                          rc->stats[j].weight = 1.0;
1029          free(rc);                  }
1030          return(0);                  rc->avg_weight += rc->num_frames * 1.0;
1031                    n += rc->num_frames;
1032  }  }
1033    
1034    
1035            for(i=0; i < create->num_zones; i++) {
1036    
1037  static int rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)                  int next = (i+1<create->num_zones) ? create->zones[i+1].frame : rc->num_frames;
 {  
     stat_t * s = &rc->stats[data->frame_num];  
     int overflow;  
     int desired;  
     double dbytes;  
     double curve_temp;  
     int capped_to_max_framesize = 0;  
1038    
1039      if (data->frame_num >= rc->num_frames) {                  if (i==0 && create->zones[i].frame > 0) {
1040          /* insufficent stats data */                          for (j = 0; j < create->zones[i].frame && j < rc->num_frames; j++) {
1041          return 0;                                  rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1042                                    rc->stats[j].weight = 1.0;
1043      }      }
1044                            rc->avg_weight += create->zones[i].frame * 1.0;
1045      overflow = rc->overflow / 8;        /* XXX: why by 8 */                          n += create->zones[i].frame;
   
     if (s->type == XVID_TYPE_IVOP) {        /* XXX: why */  
         overflow = 0;  
1046      }      }
1047    
1048      desired = s->scaled_length;                  if (create->zones[i].mode == XVID_ZONE_WEIGHT) {
1049                            for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {
1050      dbytes = desired;                                  rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
1051      if (s->type == XVID_TYPE_IVOP) {                                  rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;
1052          dbytes += desired * rc->param.keyframe_boost / 100;                          }
1053                            next -= create->zones[i].frame;
1054                            rc->avg_weight += (double)(next * create->zones[i].increment) / (double)create->zones[i].base;
1055                            n += next;
1056                    }else{  /* XVID_ZONE_QUANT */
1057                            for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {
1058                                    rc->stats[j].zone_mode = XVID_ZONE_QUANT;
1059                                    rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;
1060                                    rc->tot_quant += rc->stats[j].length;
1061                            }
1062                    }
1063      }      }
1064      dbytes /= rc->movie_curve;          rc->avg_weight = n>0 ? rc->avg_weight/n : 1.0;
1065    
1066      if (s->type == XVID_TYPE_BVOP) {          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- center_weight:%f (for %d frames)  fixed_bytes:%d\n", rc->avg_weight, n, rc->tot_quant);
         dbytes *= rc->avg_length[XVID_TYPE_PVOP-1] / rc->avg_length[XVID_TYPE_BVOP-1];  
1067      }      }
1068    
     if (rc->param.payback_method == XVID_PAYBACK_BIAS) {  
         desired =(int)(rc->curve_comp_error / rc->param.bitrate_payback_delay);  
     }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);  
1069    
1070                  if (labs(desired) > fabs(rc->curve_comp_error)) {  /* scale the curve */
1071                          desired = (int)rc->curve_comp_error;  static void
1072                  }  first_pass_scale_curve_internal(rc_2pass2_t *rc)
1073      }  {
1074            int64_t target;
1075            int64_t pass1_length;
1076            double scaler;
1077            int i, num_MBs;
1078    
1079      rc->curve_comp_error -= desired;          /* We remove the bytes used by the fixed quantizer zones
1080             * ToDo: this approach is flawed, the same amount of bytes is removed from
1081             *       target and first pass data, this has no sense, zone_process should
1082             *       give us two results one for unscaled data (1pass) and the other
1083             *       one for scaled data and we should then write:
1084             *       target = rc->target - rc->tot_quant_scaled;
1085             *       pass1_length = rc->i+p+b - rc->tot_quant_firstpass */
1086            target = rc->target - rc->tot_quant;
1087    
1088            /* Do the same for the first pass data */
1089            pass1_length  = rc->tot_length[XVID_TYPE_IVOP-1];
1090            pass1_length += rc->tot_length[XVID_TYPE_PVOP-1];
1091            pass1_length += rc->tot_length[XVID_TYPE_BVOP-1];
1092            pass1_length -= rc->tot_quant;
1093    
1094            /* Let's compute a linear scaler in order to perform curve scaling */
1095            scaler = (double)target / (double)pass1_length;
1096    
1097            if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {
1098                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- WARNING: Undersize detected before correction\n");
1099                    scaler = 1.0;
1100            }
1101    
1102            /* Compute min frame lengths (for each frame type) according to the number
1103             * of MBs. We sum all block type counters of frame 0, this gives us the
1104             * number of MBs.
1105             *
1106             * We compare these hardcoded values with observed values in first pass
1107             * (determined in pre_process0).Then we keep the real minimum. */
1108    
1109      /* alt curve */          /* Number of MBs */
1110            num_MBs  = rc->stats[0].blks[0];
1111            num_MBs += rc->stats[0].blks[1];
1112            num_MBs += rc->stats[0].blks[2];
1113    
1114            /* Minimum for I frames */
1115            if(rc->min_length[XVID_TYPE_IVOP-1] > ((num_MBs*22) + 240) / 8)
1116                    rc->min_length[XVID_TYPE_IVOP-1] = ((num_MBs*22) + 240) / 8;
1117    
1118            /* Minimum for P/S frames */
1119            if(rc->min_length[XVID_TYPE_PVOP-1] > ((num_MBs) + 88)  / 8)
1120                    rc->min_length[XVID_TYPE_PVOP-1] = ((num_MBs) + 88)  / 8;
1121    
1122            /* Minimum for B frames */
1123            if(rc->min_length[XVID_TYPE_BVOP-1] > 8)
1124                    rc->min_length[XVID_TYPE_BVOP-1] = 8;
1125    
1126      curve_temp = 0; /* XXX: warning */          /* Perform an initial scale pass.
1127             *
1128             * If a frame size is scaled underneath our hardcoded minimums, then we
1129             * force the frame size to the minimum, and deduct the original & scaled
1130             * frame length from the original and target total lengths */
1131            for (i=0; i<rc->num_frames; i++) {
1132                    twopass_stat_t * s = &rc->stats[i];
1133                    int len;
1134    
1135      if (rc->param.use_alt_curve) {                  /* No need to scale frame length for which a specific quantizer is
1136          if (s->type != XVID_TYPE_IVOP)  {                   * specified thanks to zones */
1137              if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                  if (s->zone_mode == XVID_ZONE_QUANT) {
1138                  if (dbytes >= rc->alt_curve_high) {                          s->scaled_length = s->length;
1139                                          curve_temp = dbytes * (rc->alt_curve_mid_qual - rc->alt_curve_qual_dev);                          continue;
                 }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))));  
                                         }  
1140                                  }                                  }
1141    
1142                    /* Compute the scaled length */
1143                    len = (int)((double)s->length * scaler * s->weight / rc->avg_weight);
1144    
1145                    /* Compare with the computed minimum */
1146                    if (len < rc->min_length[s->type-1]) {
1147                            /* This is a 'forced size' frame, set its frame size to the
1148                             * computed minimum */
1149                            s->scaled_length = rc->min_length[s->type-1];
1150    
1151                            /* Remove both scaled and original size from their respective
1152                             * total counters, as we prepare a second pass for 'regular'
1153                             * frames */
1154                            target -= s->scaled_length;
1155                            pass1_length -= s->length;
1156                          }else{                          }else{
1157                  if (dbytes <= rc->alt_curve_low){                          /* Do nothing for now, we'll scale this later */
1158                                          curve_temp = dbytes;                          s->scaled_length = 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_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))));  
                     }  
1159                                  }                                  }
1160                          }                          }
                         if (s->type == XVID_TYPE_BVOP)  
                                 curve_temp *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
1161    
1162                          curve_temp = curve_temp * rc->curve_comp_scale + rc->alt_curve_curve_bias_bonus;          /* The first pass on data substracted all 'forced size' frames from the
1163             * total counters. Now, it's possible to scale the 'regular' frames. */
1164    
1165                          desired += ((int)curve_temp);          /* Scaling factor for 'regular' frames */
1166                          rc->curve_comp_error += curve_temp - (int)curve_temp;          scaler = (double)target / (double)pass1_length;
                 }else{  
                         if (s->type == XVID_TYPE_BVOP)  
                                 dbytes *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  
1167    
1168                          desired += ((int)dbytes);          /* Detect undersizing */
1169                          rc->curve_comp_error += dbytes - (int)dbytes;          if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {
1170                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- WARNING: Undersize detected after correction\n");
1171                    scaler = 1.0;
1172                  }                  }
1173    
1174      }else if ((rc->param.curve_compression_high + rc->param.curve_compression_low) &&   s->type != XVID_TYPE_IVOP) {          /* Do another pass with the new scaler */
1175            for (i=0; i<rc->num_frames; i++) {
1176                    twopass_stat_t * s = &rc->stats[i];
1177    
1178          curve_temp = rc->curve_comp_scale;                  /* Ignore frame with forced frame sizes */
1179          if (dbytes > rc->avg_length[XVID_TYPE_PVOP-1]) {                  if (s->scaled_length == 0)
1180              curve_temp *= ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_high / 100.0);                          s->scaled_length = (int)((double)s->length * scaler * s->weight / rc->avg_weight);
         } else {  
             curve_temp *= ((double)dbytes + (rc->avg_length[XVID_TYPE_PVOP-1] - dbytes) * rc->param.curve_compression_low / 100.0);  
1181          }          }
1182    
1183          if (s->type == XVID_TYPE_BVOP){          /* Job done */
1184              curve_temp *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];          return;
1185          }          }
1186    
1187          desired += (int)curve_temp;  /* Apply all user settings to the scaled curve
1188          rc->curve_comp_error += curve_temp - (int)curve_temp;   * This implies:
1189      }else{   *   keyframe boosting
1190          if (s->type == XVID_TYPE_BVOP){   *   high/low compression */
1191                          dbytes *= rc->avg_length[XVID_TYPE_BVOP-1] / rc->avg_length[XVID_TYPE_PVOP-1];  static void
1192          }  scaled_curve_apply_advanced_parameters(rc_2pass2_t * rc)
1193    {
1194            int i;
1195            uint64_t ivop_boost_total;
1196    
1197                  desired += (int)dbytes;          /* Reset the rate controller (per frame type) total byte counters */
1198                  rc->curve_comp_error += dbytes - (int)dbytes;          for (i=0; i<3; i++) rc->tot_scaled_length[i] = 0;
     }  
1199    
1200          if (desired > s->length){          /* Compute total bytes for each frame type */
1201                  rc->curve_comp_error += desired - s->length;          for (i=0; i<rc->num_frames;i++) {
1202                  desired = s->length;                  twopass_stat_t *s = &rc->stats[i];
1203          }else{                  rc->tot_scaled_length[s->type-1] += s->scaled_length;
         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;  
             }  
             desired = rc->min_length[s->type-1];  
         }  
1204          }          }
1205    
1206      s->desired_length = desired;          /* First we compute the total amount of bits needed, as being described by
1207             * the scaled distribution. During this pass over the complete stats data,
1208             * we see how much bits two user settings will get/give from/to p&b frames:
1209      /* if this keyframe is too close to the next, reduce it's byte allotment           *  - keyframe boosting
1210      XXX: why do we do this after setting the desired length  */           *  - keyframe distance penalty */
1211            rc->KF_idx = 0;
1212            ivop_boost_total = 0;
1213            for (i=0; i<rc->num_frames; i++) {
1214                    twopass_stat_t * s = &rc->stats[i];
1215    
1216                    /* Some more work is needed for I frames */
1217          if (s->type == XVID_TYPE_IVOP) {          if (s->type == XVID_TYPE_IVOP) {
1218                  int KFdistance = rc->keyframe_locations[rc->KF_idx] - rc->keyframe_locations[rc->KF_idx - 1];                          int penalty_distance;
1219                            int ivop_boost;
1220    
1221          if (KFdistance < rc->param.kftreshold) {                          /* Accumulate bytes needed for keyframe boosting */
1222                            ivop_boost = s->scaled_length*rc->param.keyframe_boost/100;
1223    
1224              KFdistance = KFdistance - rc->param.min_key_interval;                          if (rc->KF_idx) {
1225                                    /* Minimum keyframe distance penalties */
1226                                    penalty_distance  = rc->param.min_key_interval;
1227                                    penalty_distance -= rc->keyframe_locations[rc->KF_idx];
1228                                    penalty_distance += rc->keyframe_locations[rc->KF_idx-1];
1229    
1230                          if (KFdistance >= 0) {                                  /* Ah ah ! guilty keyframe, you're under arrest ! */
1231                  int KF_min_size;                                  if (penalty_distance > 0)
1232                                             ivop_boost -= (s->scaled_length + ivop_boost)*penalty_distance*rc->param.kfreduction/100;
1233                            }
1234    
1235                                  KF_min_size = desired * (100 - rc->param.kfreduction) / 100;                          /* If the frame size drops under the minimum length, then cap ivop_boost */
1236                                  if (KF_min_size < 1)                          if (ivop_boost + s->scaled_length < rc->min_length[XVID_TYPE_IVOP-1])
1237                                          KF_min_size = 1;                                  ivop_boost = rc->min_length[XVID_TYPE_IVOP-1] - s->scaled_length;
1238    
1239                                  desired = KF_min_size + (desired - KF_min_size) * KFdistance /                          /* Accumulate the ivop boost */
1240                                          (rc->param.kftreshold - rc->param.min_key_interval);                          ivop_boost_total += ivop_boost;
1241    
1242                                  if (desired < 1)                          /* Don't forget to update the keyframe index */
1243                                          desired = 1;                          rc->KF_idx++;
                         }  
1244                  }                  }
1245          }          }
1246    
1247      overflow = (int)((double)overflow * desired / rc->avg_length[XVID_TYPE_PVOP-1]);          /* Initialize the IBoost tax ratio for P/S/B frames
1248             *
1249             * This ratio has to be applied to p/b/s frames in order to reserve
1250             * additional bits for keyframes (keyframe boosting) or if too much
1251             * keyframe distance is applied, bits retrieved from the keyframes.
1252             *
1253             * ie pb_length *= rc->pb_iboost_tax_ratio;
1254             *
1255             *    gives the ideal length of a p/b frame */
1256    
1257            /* Compute the total length of p/b/s frames (temporary storage into
1258             * movie_curve) */
1259            rc->pb_iboost_tax_ratio  = (double)rc->tot_scaled_length[XVID_TYPE_PVOP-1];
1260            rc->pb_iboost_tax_ratio += (double)rc->tot_scaled_length[XVID_TYPE_BVOP-1];
1261    
1262            /* Compute the ratio described above
1263             *     taxed_total = sum(0, n, tax*scaled_length)
1264             * <=> taxed_total = tax.sum(0, n, tax*scaled_length)
1265             * <=> tax = taxed_total / original_total */
1266            rc->pb_iboost_tax_ratio =
1267                    (rc->pb_iboost_tax_ratio - ivop_boost_total) /
1268                    rc->pb_iboost_tax_ratio;
1269    
1270          // Foxer: reign in overflow with huge frames          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- IFrame boost tax ratio:%.2f\n",
1271          if (labs(overflow) > labs(rc->overflow)) {                          rc->pb_iboost_tax_ratio);
                 overflow = rc->overflow;  
         }  
1272    
1273      // Foxer: make sure overflow doesn't run away          /* Compute the average size of frames per frame type */
1274            for(i=0; i<3; i++) {
1275                    /* Special case for missing type or weird case */
1276                    if (rc->count[i] == 0 || rc->pb_iboost_tax_ratio == 0) {
1277                            rc->avg_length[i] = 1;
1278                    } else {
1279                            rc->avg_length[i] = rc->tot_scaled_length[i];
1280    
1281          if (overflow > desired * rc->param.max_overflow_improvement / 100) {                          if (i == XVID_TYPE_IVOP) {
1282                  desired += (overflow <= desired) ? desired * rc->param.max_overflow_improvement / 100 :                                  /* I Frames total has to be added the boost total */
1283                          overflow * rc->param.max_overflow_improvement / 100;                                  rc->avg_length[i] += ivop_boost_total;
         }else if (overflow < desired * rc->param.max_overflow_degradation / -100){  
                 desired += desired * rc->param.max_overflow_degradation / -100;  
1284          }else{          }else{
1285                  desired += overflow;                                  /* P/B frames has to taxed */
1286                                    rc->avg_length[i] *= rc->pb_iboost_tax_ratio;
1287          }          }
1288    
1289      if (desired > rc->max_length) {                          /* Finally compute the average frame size */
1290                  capped_to_max_framesize = 1;                          rc->avg_length[i] /= (double)rc->count[i];
                 desired = rc->max_length;  
1291          }          }
   
     // make sure to not scale below the minimum framesize  
     if (desired < rc->min_length[s->type-1]) {  
         desired = rc->min_length[s->type-1];  
1292      }      }
1293    
1294            /* Assymetric curve compression */
1295            if (rc->param.curve_compression_high || rc->param.curve_compression_low) {
1296                    double symetric_total;
1297                    double assymetric_delta_total;
1298    
1299      // very 'simple' quant<->filesize relationship                  /* Like I frame boosting, assymetric curve compression modifies the total
1300      data->quant= (s->quant * s->length) / desired;                   * amount of needed bits, we must compute the ratio so we can prescale
1301                     lengths */
1302          if (data->quant < 1) {                  symetric_total = 0;
1303                  data->quant = 1;                  assymetric_delta_total = 0;
1304      } else if (data->quant > 31) {                  for (i=0; i<rc->num_frames; i++) {
1305                  data->quant = 31;                          double assymetric_delta;
1306          }                          double dbytes;
1307          else if (s->type != XVID_TYPE_IVOP)                          twopass_stat_t * s = &rc->stats[i];
         {  
                 // 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;  
1308    
1309                          if (rc->bquant_error[data->quant] >= 1.0) {                          /* I Frames are not concerned by assymetric scaling */
1310                                  rc->bquant_error[data->quant] -= 1.0;                          if (s->type == XVID_TYPE_IVOP)
1311                                  data->quant++;                                  continue;
                         }  
                 }else{  
                         rc->pquant_error[data->quant] += ((double)(s->quant * s->length) / desired) - data->quant;  
1312    
1313              if (rc->pquant_error[data->quant] >= 1.0) {                          /* During the real run, we would have to apply the iboost tax */
1314                                  rc->pquant_error[data->quant] -= 1.0;                          dbytes = s->scaled_length * rc->pb_iboost_tax_ratio;
                                 ++data->quant;  
                         }  
                 }  
         }  
1315    
1316      /* cap to min/max quant */                          /* Update the symmetric curve compression total */
1317                            symetric_total += dbytes;
1318    
1319      if (data->quant < rc->param.min_quant[s->type-1]) {                          /* Apply assymetric curve compression */
1320          data->quant = rc->param.min_quant[s->type-1];                          if (dbytes > rc->avg_length[s->type-1])
1321      }else if (data->quant > rc->param.max_quant[s->type-1]) {                                  assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * (double)rc->param.curve_compression_high / 100.0f;
1322          data->quant = rc->param.max_quant[s->type-1];                          else
1323      }                                  assymetric_delta = (rc->avg_length[s->type-1] - dbytes) * (double)rc->param.curve_compression_low  / 100.0f;
1324    
1325      /* subsequent p/b frame quants can only be +- 2 */                          /* Cap to the minimum frame size if needed */
1326          if (s->type != XVID_TYPE_IVOP && rc->last_quant[s->type-1] && capped_to_max_framesize == 0) {                          if (dbytes + assymetric_delta < rc->min_length[s->type-1])
1327                                    assymetric_delta = rc->min_length[s->type-1] - dbytes;
1328    
1329                  if (data->quant > rc->last_quant[s->type-1] + 2) {                          /* Accumulate after assymetric curve compression */
1330                          data->quant = rc->last_quant[s->type-1] + 2;                          assymetric_delta_total += assymetric_delta;
                         DPRINTF(DPRINTF_RC, "p/b-frame quantizer prevented from rising too steeply");  
                 }  
                 if (data->quant < rc->last_quant[s->type-1] - 2) {  
                         data->quant = rc->last_quant[s->type-1] - 2;  
                         DPRINTF(DPRINTF_RC, "p/b-frame quantizer prevented from falling too steeply");  
                 }  
1331          }          }
1332    
1333          if (capped_to_max_framesize == 0) {                  /* Compute the tax that all p/b frames have to pay in order to respect the
1334          rc->last_quant[s->type-1] = data->quant;                   * bit distribution changes that the assymetric compression curve imposes
1335                     * We want assymetric_total = sum(0, n-1, tax.scaled_length)
1336                     *      ie assymetric_total = ratio.sum(0, n-1, scaled_length)
1337                     *         ratio = assymetric_total / symmetric_total */
1338                    rc->assymetric_tax_ratio = ((double)symetric_total - (double)assymetric_delta_total) / (double)symetric_total;
1339            } else {
1340                    rc->assymetric_tax_ratio = 1.0f;
1341          }          }
1342    
1343          return 0;          DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- Assymetric tax ratio:%.2f\n", rc->assymetric_tax_ratio);
 }  
1344    
1345            /* Last bits that need to be reset */
1346            rc->overflow = 0;
1347            rc->KFoverflow = 0;
1348            rc->KFoverflow_partial = 0;
1349            rc->KF_idx = 0;
1350            rc->desired_total = 0;
1351            rc->real_total = 0;
1352    
1353            /* Job done */
1354            return;
1355    }
1356    
1357  static int rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)  /*****************************************************************************
1358     * Still more low level stuff (nothing to do with stats treatment)
1359     ****************************************************************************/
1360    
1361    /* This function returns an allocated string containing a complete line read
1362     * from the file starting at the current position */
1363    static char *
1364    readline(FILE *f)
1365  {  {
1366      stat_t * s = &rc->stats[data->frame_num];          char *buffer = NULL;
1367            int buffer_size = 0;
1368      if (data->frame_num >= rc->num_frames) {          int pos = 0;
         /* insufficent stats data */  
         return 0;  
     }  
1369    
1370      rc->quant_count[data->quant]++;          do {
1371                    int c;
1372    
1373      if (data->type == XVID_TYPE_IVOP) {                  /* Read a character from the stream */
1374          int kfdiff = (rc->keyframe_locations[rc->KF_idx] -      rc->keyframe_locations[rc->KF_idx - 1]);                  c = fgetc(f);
1375    
1376          rc->overflow += rc->KFoverflow;                  /* Is that EOF or new line ? */
1377          rc->KFoverflow = s->desired_length - data->length;                  if(c == EOF || c == '\n')
1378                            break;
1379    
1380          if (kfdiff > 1) {  // non-consecutive keyframes                  /* Do we have to update buffer ? */
1381              rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);                  if(pos >= buffer_size - 1) {
1382          }else{ // consecutive keyframes                          buffer_size += BUF_SZ;
1383                          rc->overflow += rc->KFoverflow;                          buffer = (char*)realloc(buffer, buffer_size);
1384                          rc->KFoverflow = 0;                          if (buffer == NULL)
1385                          rc->KFoverflow_partial = 0;                                  return(NULL);
         }  
         rc->KF_idx++;  
     }else{  
         // distribute part of the keyframe overflow  
         rc->overflow += s->desired_length - data->length + rc->KFoverflow_partial;  
         rc->KFoverflow -= rc->KFoverflow_partial;  
1386      }      }
1387    
1388      printf("[%i] quant:%i stats1:%i scaled:%i actual:%i overflow:%i\n",                  buffer[pos] = c;
1389          data->frame_num,                  pos++;
1390          data->quant,          } while(1);
         s->length,  
         s->scaled_length,  
         data->length,  
         rc->overflow);  
1391    
1392      return(0);          /* Read \n or EOF */
1393            if (buffer == NULL) {
1394                    /* EOF, so we reached the end of the file, return NULL */
1395                    if(feof(f))
1396                            return(NULL);
1397    
1398                    /* Just an empty line with just a newline, allocate a 1 byte buffer to
1399                     * store a zero length string */
1400                    buffer = (char*)malloc(1);
1401                    if(buffer == NULL)
1402                            return(NULL);
1403  }  }
1404    
1405            /* Zero terminated string */
1406            buffer[pos] = '\0';
1407    
1408            return(buffer);
1409    }
1410    
1411  int xvid_plugin_2pass2(void * handle, int opt, void * param1, void * param2)  /* This function returns a pointer to the first non space char in the given
1412     * string */
1413    static char *
1414    skipspaces(char *string)
1415  {  {
1416      switch(opt)          const char spaces[] =
1417      {      {
1418      case XVID_PLG_INFO :                          ' ','\t','\0'
1419          return 0;                  };
1420            const char *spacechar = spaces;
1421    
1422            if (string == NULL) return(NULL);
1423    
1424            while (*string != '\0') {
1425                    /* Test against space chars */
1426                    while (*spacechar != '\0') {
1427                            if (*string == *spacechar) {
1428                                    string++;
1429                                    spacechar = spaces;
1430                                    break;
1431                            }
1432                            spacechar++;
1433                    }
1434    
1435      case XVID_PLG_CREATE :                  /* No space char */
1436          return rc_2pass2_create((xvid_plg_create_t*)param1, param2);                  if (*spacechar == '\0') return(string);
1437            }
1438    
1439      case XVID_PLG_DESTROY :          return(string);
1440          return rc_2pass2_destroy((rc_2pass2_t*)handle, (xvid_plg_destroy_t*)param1);  }
1441    
1442      case XVID_PLG_BEFORE :  /* This function returns a boolean that tells if the string is only a
1443          return rc_2pass2_before((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);   * comment */
1444    static int
1445    iscomment(char *string)
1446    {
1447            const char comments[] =
1448                    {
1449                            '#',';', '%', '\0'
1450                    };
1451            const char *cmtchar = comments;
1452            int iscomment = 0;
1453    
1454            if (string == NULL) return(1);
1455    
1456            string = skipspaces(string);
1457    
1458            while(*cmtchar != '\0') {
1459                    if(*string == *cmtchar) {
1460                            iscomment = 1;
1461                            break;
1462                    }
1463                    cmtchar++;
1464            }
1465    
1466      case XVID_PLG_AFTER :          return(iscomment);
         return rc_2pass2_after((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);  
1467      }      }
1468    
1469      return XVID_ERR_FAIL;  #if 0
1470    static void
1471    stats_print(rc_2pass2_t * rc)
1472    {
1473            int i;
1474            const char frame_type[4] = { 'i', 'p', 'b', 's'};
1475    
1476            for (i=0; i<rc->num_frames; i++) {
1477                    twopass_stat_t *s = &rc->stats[i];
1478                    DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- frame:%d type:%c quant:%d stats:%d scaled:%d desired:%d actual:%d overflow(%c):%.2f\n",
1479                                    i, frame_type[s->type-1], -1, s->length, s->scaled_length,
1480                                    s->desired_length, -1, frame_type[s->type-1], -1.0f);
1481            }
1482  }  }
1483    #endif
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