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DOCS/xml/README: improve
[mplayer/glamo.git] / xvid_vbr.c
blob08053248fc15fb366d1e57d3f98dfffbb13c9ebe
1 /******************************************************************************
2 *
3 * XviD VBR Library
4 *
5 * Copyright (C) 2002 Edouard Gomez <ed.gomez@wanadoo.fr>
6 *
7 * The curve treatment algorithm is based on work done by Foxer <email?> and
8 * Dirk Knop <dknop@gwdg.de> for the XviD vfw dynamic library.
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
23 *
24 *****************************************************************************/
25
26 /* Standard Headers */
27 #include <stdio.h>
28 #include <string.h>
29 #include <fcntl.h>
30 #include <stdlib.h>
31 #include <math.h>
32
33 /* Local headers */
34 #include "xvid_vbr.h"
35
36 /******************************************************************************
37 * Build time constants
38 *****************************************************************************/
39
40 /*
41 * Portability note
42 * Perhaps the msvc headers define Pi with another constant name
43 */
44 #define DEG2RAD (M_PI / 180.0)
45
46 /* Defaults settings will be computed with the help of these constants */
47 #define DEFAULT_DESIRED_SIZE 700
48 #define DEFAULT_AUDIO_BITRATE 128
49 #define DEFAULT_MOVIE_LENGTH 2
50 #define DEFAULT_TWOPASS_BOOST 1000
51 #define DEFAULT_FPS 25.0f
52 #define DEFAULT_CREDITS_SIZE 0
53
54 #define DEFAULT_XVID_DBG_FILE "xvid.dbg"
55 #define DEFAULT_XVID_STATS_FILE "xvid.stats"
56
57
58 /******************************************************************************
59 * Local prototypes
60 *****************************************************************************/
61
62 /* Sub vbrInit cases functions */
63 static vbr_init_function vbr_init_dummy;
64 static vbr_init_function vbr_init_2pass1;
65 static vbr_init_function vbr_init_2pass2;
66 static vbr_init_function vbr_init_fixedquant;
67
68 /* Sub vbrGetQuant cases functions */
69 static vbr_get_quant_function vbr_getquant_1pass;
70 static vbr_get_quant_function vbr_getquant_2pass1;
71 static vbr_get_quant_function vbr_getquant_2pass2;
72 static vbr_get_quant_function vbr_getquant_fixedquant;
73
74 /* Sub vbrGetIntra cases functions */
75 static vbr_get_intra_function vbr_getintra_1pass;
76 static vbr_get_intra_function vbr_getintra_2pass1;
77 static vbr_get_intra_function vbr_getintra_2pass2;
78 static vbr_get_intra_function vbr_getintra_fixedquant;
79
80 /* Sub vbrUpdate prototypes */
81 static vbr_update_function vbr_update_dummy;
82 static vbr_update_function vbr_update_2pass1;
83 static vbr_update_function vbr_update_2pass2;
84
85 /* Sub vbrFinish cases functions */
86 static vbr_finish_function vbr_finish_dummy;
87 static vbr_finish_function vbr_finish_2pass1;
88 static vbr_finish_function vbr_finish_2pass2;
89
90 /* Is the encoder in the credits */
91 #define FRAME_TYPE_NORMAL_MOVIE 0x00
92 #define FRAME_TYPE_STARTING_CREDITS 0x01
93 #define FRAME_TYPE_ENDING_CREDITS 0x02
94
95 /******************************************************************************
96 * Inline utility functions
97 *****************************************************************************/
98
99 static inline int util_frametype(vbr_control_t *state)
100 {
101
102 if(state->credits_start) {
103
104 if(state->cur_frame >= state->credits_start_begin &&
105 state->cur_frame < state->credits_start_end)
106 return(FRAME_TYPE_STARTING_CREDITS);
107
108 }
109
110 if(state->credits_end) {
111
112 if(state->cur_frame >= state->credits_end_begin &&
113 state->cur_frame < state->credits_end_end)
114 return(FRAME_TYPE_ENDING_CREDITS);
115
116 }
117
118 return(FRAME_TYPE_NORMAL_MOVIE);
119
120
121 }
122
123 static inline int util_creditsframes(vbr_control_t *state)
124 {
125
126 int frames = 0;
127
128 if(state->credits_start)
129 frames += state->credits_start_end - state->credits_start_begin;
130 if(state->credits_end)
131 frames += state->credits_end_end - state->credits_end_begin;
132
133 return(frames);
134
135 }
136
137 /******************************************************************************
138 * Functions
139 *****************************************************************************/
140
141 /*****************************************************************************
142 * Function description :
143 *
144 * This function initialiazes the vbr_control_t with safe defaults for all
145 * modes.
146 *
147 * Return Values :
148 * = 0
149 ****************************************************************************/
150
151 int vbrSetDefaults(vbr_control_t *state)
152 {
153
154 /* Set all the structure to zero */
155 memset(state, 0, sizeof(state));
156
157 /* Default mode is CBR */
158 state->mode = VBR_MODE_1PASS;
159
160 /* Default statistic filename */
161 state->filename = DEFAULT_XVID_STATS_FILE;
162
163 /*
164 * Default is a 2hour movie on 700Mo CD-ROM + 128kbit sound track
165 * This represents a target bitrate of 687kbit/s
166 */
167 state->desired_size = DEFAULT_DESIRED_SIZE*1024*1024 -
168 DEFAULT_MOVIE_LENGTH*3600*DEFAULT_AUDIO_BITRATE*1000/8;
169 state->desired_bitrate = state->desired_size*8/(DEFAULT_MOVIE_LENGTH*3600);
170
171 /* Credits */
172 state->credits_mode = VBR_CREDITS_MODE_RATE;
173 state->credits_start = 0;
174 state->credits_start_begin = 0;
175 state->credits_start_end = 0;
176 state->credits_end = 0;
177 state->credits_end_begin = 0;
178 state->credits_end_end = 0;
179 state->credits_quant_ratio = 20;
180 state->credits_fixed_quant = 20;
181 state->credits_quant_i = 20;
182 state->credits_quant_p = 20;
183 state->credits_start_size = DEFAULT_CREDITS_SIZE*1024*1024;
184 state->credits_end_size = DEFAULT_CREDITS_SIZE*1024*1024;
185
186 /* Keyframe boost */
187 state->keyframe_boost = 0;
188 state->kftreshold = 10;
189 state->kfreduction = 30;
190 state->min_key_interval = 1;
191 state->max_key_interval = (int)DEFAULT_FPS*10;
192
193 /* Normal curve treatment */
194 state->curve_compression_high = 25;
195 state->curve_compression_low = 10;
196
197 /* Alt curve */
198 state->use_alt_curve = 1;
199 state->alt_curve_type = VBR_ALT_CURVE_LINEAR;
200 state->alt_curve_low_dist = 90;
201 state->alt_curve_high_dist = 500;
202 state->alt_curve_min_rel_qual = 50;
203 state->alt_curve_use_auto = 1;
204 state->alt_curve_auto_str = 30;
205 state->alt_curve_use_auto_bonus_bias = 1;
206 state->alt_curve_bonus_bias = 50;
207 state->bitrate_payback_method = VBR_PAYBACK_BIAS;
208 state->bitrate_payback_delay = 250;
209 state->twopass_max_bitrate = DEFAULT_TWOPASS_BOOST*state->desired_bitrate;
210 state->twopass_max_overflow_improvement = 60;
211 state->twopass_max_overflow_degradation = 60;
212 state->max_iquant = 31;
213 state->min_iquant = 2;
214 state->max_pquant = 31;
215 state->min_pquant = 2;
216 state->fixed_quant = 3;
217
218 state->max_framesize = (1.0/(float)DEFAULT_FPS) * state->twopass_max_bitrate / 8;
219
220 state->fps = (float)DEFAULT_FPS;
221
222 return(0);
223
224 }
225
226 /*****************************************************************************
227 * Function description :
228 *
229 * This function initialiaze the vbr_control_t state passed in parameter.
230 *
231 * The initialization depends on state->mode, there are 4 modes allowed.
232 * Each mode description is done in the README file shipped with the lib.
233 *
234 * Return values :
235 *
236 * = 0 on success
237 * = -1 on error
238 *****************************************************************************/
239
240 int vbrInit(vbr_control_t *state)
241 {
242
243 if(state == NULL) return(-1);
244
245 /* Function pointers safe initialization */
246 state->init = NULL;
247 state->getquant = NULL;
248 state->getintra = NULL;
249 state->update = NULL;
250 state->finish = NULL;
251
252 if(state->debug) {
253
254 state->debug_file = fopen(DEFAULT_XVID_DBG_FILE, "w+");
255
256 if(state->debug_file == NULL)
257 return(-1);
258
259 fprintf(state->debug_file, "# XviD Debug output\n");
260 fprintf(state->debug_file, "# quant | intra | header bytes"
261 "| total bytes | kblocks | mblocks | ublocks"
262 "| vbr overflow | vbr kf overflow"
263 "| vbr kf partial overflow\n\n");
264 }
265
266 /* Function pointers sub case initialization */
267 switch(state->mode) {
268 case VBR_MODE_1PASS:
269 state->init = vbr_init_dummy;
270 state->getquant = vbr_getquant_1pass;
271 state->getintra = vbr_getintra_1pass;
272 state->update = vbr_update_dummy;
273 state->finish = vbr_finish_dummy;
274 break;
275 case VBR_MODE_2PASS_1:
276 state->init = vbr_init_2pass1;
277 state->getquant = vbr_getquant_2pass1;
278 state->getintra = vbr_getintra_2pass1;
279 state->update = vbr_update_2pass1;
280 state->finish = vbr_finish_2pass1;
281 break;
282 case VBR_MODE_FIXED_QUANT:
283 state->init = vbr_init_fixedquant;
284 state->getquant = vbr_getquant_fixedquant;
285 state->getintra = vbr_getintra_fixedquant;
286 state->update = vbr_update_dummy;
287 state->finish = vbr_finish_dummy;
288 break;
289 case VBR_MODE_2PASS_2:
290 state->init = vbr_init_2pass2;
291 state->getintra = vbr_getintra_2pass2;
292 state->getquant = vbr_getquant_2pass2;
293 state->update = vbr_update_2pass2;
294 state->finish = vbr_finish_2pass2;
295 break;
296 default:
297 return(-1);
298 }
299
300 return(state->init(state));
301
302 }
303
304 /******************************************************************************
305 * Function description :
306 *
307 * This function returns an adapted quantizer according to the current vbr
308 * controler state
309 *
310 * Return values :
311 * the quantizer value (0 <= value <= 31)
312 * (0 is a special case, means : let XviD decide)
313 *
314 *****************************************************************************/
315
316 int vbrGetQuant(vbr_control_t *state)
317 {
318
319 /* Returns Zero, so XviD decides alone */
320 if(state == NULL || state->getquant == NULL) return(0);
321
322 return(state->getquant(state));
323
324 }
325
326 /******************************************************************************
327 * Function description :
328 *
329 * This function returns the type of the frame to be encoded next (I or P/B)
330 *
331 * Return values :
332 * = -1 let the XviD encoder decide wether or not the next frame is I
333 * = 0 no I frame
334 * = 1 force keyframe
335 *
336 *****************************************************************************/
337
338 int vbrGetIntra(vbr_control_t *state)
339 {
340
341 /* Returns -1, means let XviD decide */
342 if(state == NULL || state->getintra == NULL) return(-1);
343
344 return(state->getintra(state));
345
346 }
347
348 /******************************************************************************
349 * Function description :
350 *
351 * This function updates the vbr control state according to collected statistics
352 * from XviD core
353 *
354 * Return values :
355 *
356 * = 0 on success
357 * = -1 on error
358 *****************************************************************************/
359
360 int vbrUpdate(vbr_control_t *state,
361 int quant,
362 int intra,
363 int header_bytes,
364 int total_bytes,
365 int kblocks,
366 int mblocks,
367 int ublocks)
368 {
369
370 if(state == NULL || state->update == NULL) return(-1);
371
372 if(state->debug && state->debug_file != NULL) {
373 int idx;
374
375 fprintf(state->debug_file, "%d %d %d %d %d %d %d %d %d %d\n",
376 quant, intra, header_bytes, total_bytes, kblocks,
377 mblocks, ublocks, state->overflow, state->KFoverflow,
378 state->KFoverflow_partial);
379
380 idx = quant;
381
382 if(quant < 1)
383 idx = 1;
384 if(quant > 31)
385 idx = 31;
386
387 idx--;
388
389 state->debug_quant_count[idx]++;
390
391 }
392
393 return(state->update(state, quant, intra, header_bytes, total_bytes,
394 kblocks, mblocks, ublocks));
395
396 }
397
398 /******************************************************************************
399 * Function description :
400 *
401 * This function stops the vbr controller
402 *
403 * Return values :
404 *
405 * = 0 on success
406 * = -1 on error
407 *****************************************************************************/
408
409 int vbrFinish(vbr_control_t *state)
410 {
411
412 if(state == NULL || state->finish == NULL) return(-1);
413
414 if(state->debug && state->debug_file != NULL) {
415
416 int i;
417
418 fprintf(state->debug_file, "\n\n");
419
420 for(i=0; i<79; i++)
421 fprintf(state->debug_file, "#");
422
423 fprintf(state->debug_file, "\n# Quantizer distribution :\n\n");
424
425 for(i=0;i<32; i++) {
426
427 fprintf(state->debug_file, "# quant %d : %d\n",
428 i+1,
429 state->debug_quant_count[i]);
430
431 }
432
433 fclose(state->debug_file);
434
435 }
436
437 return(state->finish(state));
438
439 }
440
441 /******************************************************************************
442 * Dummy functions - Used when a mode does not need such a function
443 *****************************************************************************/
444
445 static int vbr_init_dummy(void *sstate)
446 {
447
448 vbr_control_t *state = sstate;
449
450 state->cur_frame = 0;
451
452 return(0);
453
454 }
455
456 static int vbr_update_dummy(void *state,
457 int quant,
458 int intra,
459 int header_bytes,
460 int total_bytes,
461 int kblocks,
462 int mblocks,
463 int ublocks)
464 {
465
466 ((vbr_control_t*)state)->cur_frame++;
467
468 return(0);
469
470 }
471
472 static int vbr_finish_dummy(void *state)
473 {
474
475 return(0);
476
477 }
478
479 /******************************************************************************
480 * 1 pass mode - XviD will do its job alone.
481 *****************************************************************************/
482
483 static int vbr_getquant_1pass(void *state)
484 {
485
486 return(0);
487
488 }
489
490 static int vbr_getintra_1pass(void *state)
491 {
492
493 return(-1);
494
495 }
496
497 /******************************************************************************
498 * 2 pass mode - first pass functions
499 *****************************************************************************/
500
501 static int vbr_init_2pass1(void *sstate)
502 {
503
504 FILE *f;
505 vbr_control_t *state = sstate;
506
507 /* Check the filename */
508 if(state->filename == NULL || state->filename[0] == '\0')
509 return(-1);
510
511 /* Initialize safe defaults for 2pass 1 */
512 state->pass1_file = NULL;
513 state->nb_frames = 0;
514 state->nb_keyframes = 0;
515 state->cur_frame = 0;
516
517 /* Open the 1st pass file */
518 if((f = fopen(state->filename, "w+")) == NULL)
519 return(-1);
520
521 /*
522 * The File Header
523 *
524 * The extra white spaces will be used during the vbrFinish to write
525 * the resulting number of frames and keyframes (10 spaces == maximum
526 * string length of an int on 32bit machines, i don't think anyone is
527 * encoding more than 4 billion frames :-)
528 */
529 fprintf(f, "# ASCII XviD vbr stat file version %d\n#\n", VBR_VERSION);
530 fprintf(f, "# frames : \n");
531 fprintf(f, "# keyframes : \n");
532 fprintf(f, "#\n# quant | intra | header bytes | total bytes | kblocks |"
533 " mblocks | ublocks\n\n");
534
535 /* Save file pointer */
536 state->pass1_file = f;
537
538 return(0);
539
540 }
541
542 static int vbr_getquant_2pass1(void *state)
543 {
544
545 return(2);
546
547 }
548
549 static int vbr_getintra_2pass1(void *state)
550 {
551
552 return(-1);
553
554 }
555
556 static int vbr_update_2pass1(void *sstate,
557 int quant,
558 int intra,
559 int header_bytes,
560 int total_bytes,
561 int kblocks,
562 int mblocks,
563 int ublocks)
564
565
566 {
567
568 vbr_control_t *state = sstate;
569
570 if(state->pass1_file == NULL)
571 return(-1);
572
573 /* Writes the resulting statistics */
574 fprintf(state->pass1_file, "%d %d %d %d %d %d %d\n",
575 quant,
576 intra,
577 header_bytes,
578 total_bytes,
579 kblocks,
580 mblocks,
581 ublocks);
582
583 /* Update vbr control state */
584 if(intra) state->nb_keyframes++;
585 state->nb_frames++;
586 state->cur_frame++;
587
588 return(0);
589
590 }
591
592 static int vbr_finish_2pass1(void *sstate)
593 {
594
595 int c, i;
596 vbr_control_t *state = sstate;
597
598 if(state->pass1_file == NULL)
599 return(-1);
600
601 /* Goto to the file beginning */
602 fseek(state->pass1_file, 0, SEEK_SET);
603
604 /* Skip the version line and the empty line */
605 c = i = 0;
606 do {
607 c = fgetc(state->pass1_file);
608
609 if(c == EOF) return(-1);
610 if(c == '\n') i++;
611
612 }while(i < 2);
613
614 /* Prepare to write to the stream */
615 fseek( state->pass1_file, 0L, SEEK_CUR );
616
617 /* Overwrite the frame field - safe as we have written extra spaces */
618 fprintf(state->pass1_file, "# frames : %.10d\n", state->nb_frames);
619
620 /* Overwrite the keyframe field */
621 fprintf(state->pass1_file, "# keyframes : %.10d\n",
622 state->nb_keyframes);
623
624 /* Close the file */
625 if(fclose(state->pass1_file) != 0)
626 return(-1);
627
628 return(0);
629
630 }
631
632 /******************************************************************************
633 * 2 pass mode - 2nd pass functions (Need to be finished)
634 *****************************************************************************/
635
636 static int vbr_init_2pass2(void *sstate)
637 {
638
639 FILE *f;
640 int c, n, pos_firstframe, credits_frames;
641 long long credits1_bytes;
642 long long credits2_bytes;
643 long long desired;
644 long long total_bytes;
645 long long itotal_bytes;
646 long long start_curved;
647 long long end_curved;
648 double total1;
649 double total2;
650
651 vbr_control_t *state = sstate;
652
653 /* Check the filename */
654 if(state->filename == NULL || state->filename[0] == '\0')
655 return(-1);
656
657 /* Initialize safe defaults for 2pass 2 */
658 state->pass1_file = NULL;
659 state->nb_frames = 0;
660 state->nb_keyframes = 0;
661
662 /* Open the 1st pass file */
663 if((f = fopen(state->filename, "r")) == NULL)
664 return(-1);
665
666 state->pass1_file = f;
667
668 /* Get the file version and check against current version */
669 fscanf(state->pass1_file, "# ASCII XviD vbr stat file version %d\n", &n);
670
671 if(n != VBR_VERSION) {
672 fclose(state->pass1_file);
673 state->pass1_file = NULL;
674 return(-1);
675 }
676
677 /* Skip the blank commented line */
678 c = n = 0;
679 do {
680
681 c = fgetc(state->pass1_file);
682
683 if(c == EOF) {
684 fclose(state->pass1_file);
685 state->pass1_file = NULL;
686 return(-1);
687 }
688
689 if(c == '\n') n++;
690
691 }while(n < 1);
692
693
694 /* Get the number of frames */
695 fscanf(state->pass1_file, "# frames : %d\n", &state->nb_frames);
696
697 /* Compute the desired size */
698 state->desired_size = (long long)
699 (((long long)state->nb_frames * (long long)state->desired_bitrate) /
700 (state->fps * 8.0));
701
702 /* Get the number of keyframes */
703 fscanf(state->pass1_file, "# keyframes : %d\n", &state->nb_keyframes);
704
705 /* Allocate memory space for the keyframe_location array */
706 if((state->keyframe_locations
707 = malloc((state->nb_keyframes+1)*sizeof(int))) == NULL) {
708 fclose(state->pass1_file);
709 state->pass1_file = NULL;
710 return(-1);
711 }
712
713 /* Skip the blank commented line and the colum description */
714 c = n = 0;
715 do {
716
717 c = fgetc(state->pass1_file);
718
719 if(c == EOF) {
720 fclose(state->pass1_file);
721 state->pass1_file = NULL;
722 return(-1);
723 }
724
725 if(c == '\n') n++;
726
727 }while(n < 2);
728
729 /* Save position for future use */
730 pos_firstframe = ftell(state->pass1_file);
731
732 /* Read and initialize some variables */
733 credits1_bytes = credits2_bytes = 0;
734 total_bytes = itotal_bytes = 0;
735 start_curved = end_curved = 0;
736 credits_frames = 0;
737
738 for(state->cur_frame = c = 0; state->cur_frame<state->nb_frames; state->cur_frame++) {
739
740 int quant, keyframe, frame_hbytes, frame_bytes;
741 int kblocks, mblocks, ublocks;
742
743 fscanf(state->pass1_file, "%d %d %d %d %d %d %d\n",
744 &quant, &keyframe, &frame_hbytes, &frame_bytes,
745 &kblocks, &mblocks, &ublocks);
746
747 /* Is the frame in the beginning credits */
748 if(util_frametype(state) == FRAME_TYPE_STARTING_CREDITS) {
749 credits1_bytes += frame_bytes;
750 credits_frames++;
751 continue;
752 }
753
754 /* Is the frame in the eding credits */
755 if(util_frametype(state) == FRAME_TYPE_ENDING_CREDITS) {
756 credits2_bytes += frame_bytes;
757 credits_frames++;
758 continue;
759 }
760
761 /* We only care about Keyframes when not in credits */
762 if(keyframe) {
763 itotal_bytes += frame_bytes + frame_bytes *
764 state->keyframe_boost / 100;
765 total_bytes += frame_bytes *
766 state->keyframe_boost / 100;
767 state->keyframe_locations[c++] = state->cur_frame;
768 }
769
770 total_bytes += frame_bytes;
771
772 }
773
774 /*
775 * Last frame is treated like an I Frame so we can dispatch overflow
776 * all other the last film segment
777 */
778 state->keyframe_locations[c] = state->cur_frame;
779
780 desired = state->desired_size;
781
782 switch(state->credits_mode) {
783 case VBR_CREDITS_MODE_QUANT :
784
785 state->movie_curve = (double)
786 (total_bytes - credits1_bytes - credits2_bytes) /
787 (desired - credits1_bytes - credits2_bytes);
788
789 start_curved = credits1_bytes;
790 end_curved = credits2_bytes;
791
792 break;
793 case VBR_CREDITS_MODE_SIZE:
794
795 /* start curve = (start / start desired size) */
796 state->credits_start_curve = (double)
797 (credits1_bytes / state->credits_start_size);
798
799 /* end curve = (end / end desired size) */
800 state->credits_end_curve = (double)
801 (credits2_bytes / state->credits_end_size);
802
803 start_curved = (long long)
804 (credits1_bytes / state->credits_start_curve);
805
806 end_curved = (long long)
807 (credits2_bytes / state->credits_end_curve);
808
809 /* movie curve=(total-credits)/(desired_size-curved credits) */
810 state->movie_curve = (double)
811 (total_bytes - credits1_bytes - credits2_bytes) /
812 (desired - start_curved - end_curved);
813
814 break;
815 case VBR_CREDITS_MODE_RATE:
816 default:
817
818 /* credits curve = (total/desired_size)*(100/credits_rate) */
819 state->credits_start_curve = state->credits_end_curve =
820 ((double)total_bytes / desired) *
821 ((double)100 / state->credits_quant_ratio);
822
823 start_curved =
824 (long long)(credits1_bytes/state->credits_start_curve);
825
826 end_curved =
827 (long long)(credits2_bytes/state->credits_end_curve);
828
829 state->movie_curve = (double)
830 (total_bytes - credits1_bytes - credits2_bytes) /
831 (desired - start_curved - end_curved);
832
833 break;
834 }
835
836 /*
837 * average frame size = (desired - curved credits - curved keyframes) /
838 * (frames - credits frames - keyframes)
839 */
840 state->average_frame = (double)
841 (desired - start_curved - end_curved -
842 (itotal_bytes / state->movie_curve)) /
843 (state->nb_frames - util_creditsframes(state) -
844 state->nb_keyframes);
845
846 /* Initialize alt curve parameters */
847 if (state->use_alt_curve) {
848
849 state->alt_curve_low =
850 state->average_frame - state->average_frame *
851 (double)(state->alt_curve_low_dist / 100.0);
852
853 state->alt_curve_low_diff =
854 state->average_frame - state->alt_curve_low;
855
856 state->alt_curve_high =
857 state->average_frame + state->average_frame *
858 (double)(state->alt_curve_high_dist / 100.0);
859
860 state->alt_curve_high_diff =
861 state->alt_curve_high - state->average_frame;
862
863 if (state->alt_curve_use_auto) {
864
865 if (state->movie_curve > 1.0) {
866
867 state->alt_curve_min_rel_qual =
868 (int)(100.0 - (100.0 - 100.0 / state->movie_curve) *
869 (double)state->alt_curve_auto_str / 100.0);
870
871 if (state->alt_curve_min_rel_qual < 20)
872 state->alt_curve_min_rel_qual = 20;
873 }
874 else {
875 state->alt_curve_min_rel_qual = 100;
876 }
877
878 }
879
880 state->alt_curve_mid_qual =
881 (1.0 + (double)state->alt_curve_min_rel_qual / 100.0) / 2.0;
882
883 state->alt_curve_qual_dev = 1.0 - state->alt_curve_mid_qual;
884
885 if (state->alt_curve_low_dist > 100) {
886
887 switch(state->alt_curve_type) {
888 case VBR_ALT_CURVE_AGGRESIVE:
889 /* Sine Curve (high aggressiveness) */
890 state->alt_curve_qual_dev *=
891 2.0 /
892 (1.0 + sin(DEG2RAD * (state->average_frame * 90.0 / state->alt_curve_low_diff)));
893
894 state->alt_curve_mid_qual =
895 1.0 - state->alt_curve_qual_dev *
896 sin(DEG2RAD * (state->average_frame * 90.0 / state->alt_curve_low_diff));
897 break;
898
899 default:
900 case VBR_ALT_CURVE_LINEAR:
901 /* Linear (medium aggressiveness) */
902 state->alt_curve_qual_dev *=
903 2.0 /
904 (1.0 + state->average_frame / state->alt_curve_low_diff);
905
906 state->alt_curve_mid_qual =
907 1.0 - state->alt_curve_qual_dev *
908 state->average_frame / state->alt_curve_low_diff;
909
910 break;
911
912 case VBR_ALT_CURVE_SOFT:
913 /* Cosine Curve (low aggressiveness) */
914 state->alt_curve_qual_dev *=
915 2.0 /
916 (1.0 + (1.0 - cos(DEG2RAD * (state->average_frame * 90.0 / state->alt_curve_low_diff))));
917
918 state->alt_curve_mid_qual =
919 1.0 - state->alt_curve_qual_dev *
920 (1.0 - cos(DEG2RAD * (state->average_frame * 90.0 / state->alt_curve_low_diff)));
921
922 break;
923 }
924 }
925 }
926
927 /* Go to the first non credits frame stats line into file */
928 fseek(state->pass1_file, pos_firstframe, SEEK_SET);
929
930 /* Perform prepass to compensate for over/undersizing */
931 total1 = total2 = 0.0;
932 for(state->cur_frame=0; state->cur_frame<state->nb_frames; state->cur_frame++) {
933
934 int quant, keyframe, frame_hbytes, frame_bytes;
935 int kblocks, mblocks, ublocks;
936
937 fscanf(state->pass1_file, "%d %d %d %d %d %d %d\n",
938 &quant, &keyframe, &frame_hbytes, &frame_bytes,
939 &kblocks, &mblocks, &ublocks);
940
941 if(util_frametype(state) != FRAME_TYPE_NORMAL_MOVIE)
942 continue;
943
944 if(!keyframe) {
945
946 double dbytes = frame_bytes / state->movie_curve;
947 total1 += dbytes;
948
949 if (state->use_alt_curve) {
950
951 if (dbytes > state->average_frame) {
952
953 if (dbytes >= state->alt_curve_high) {
954 total2 += dbytes * (state->alt_curve_mid_qual - state->alt_curve_qual_dev);
955 }
956 else {
957
958 switch(state->alt_curve_type) {
959 case VBR_ALT_CURVE_AGGRESIVE:
960
961 total2 +=
962 dbytes *
963 (state->alt_curve_mid_qual - state->alt_curve_qual_dev *
964 sin(DEG2RAD * ((dbytes - state->average_frame) * 90.0 / state->alt_curve_high_diff)));
965 break;
966 default:
967 case VBR_ALT_CURVE_LINEAR:
968
969 total2 +=
970 dbytes *
971 (state->alt_curve_mid_qual - state->alt_curve_qual_dev *
972 (dbytes - state->average_frame) / state->alt_curve_high_diff);
973 break;
974 case VBR_ALT_CURVE_SOFT:
975 total2 +=
976 dbytes *
977 (state->alt_curve_mid_qual - state->alt_curve_qual_dev *
978 (1.0 - cos(DEG2RAD * ((dbytes - state->average_frame) * 90.0 / state->alt_curve_high_diff))));
979 }
980 }
981 }
982 else {
983
984 if (dbytes <= state->alt_curve_low) {
985 total2 += dbytes;
986 }
987 else {
988
989 switch(state->alt_curve_type) {
990 case VBR_ALT_CURVE_AGGRESIVE:
991 total2 +=
992 dbytes *
993 (state->alt_curve_mid_qual - state->alt_curve_qual_dev *
994 sin(DEG2RAD * ((dbytes - state->average_frame) * 90.0 / state->alt_curve_low_diff)));
995 break;
996 default:
997 case VBR_ALT_CURVE_LINEAR:
998 total2 +=
999 dbytes *
1000 (state->alt_curve_mid_qual - state->alt_curve_qual_dev *
1001 (dbytes - state->average_frame) / state->alt_curve_low_diff);
1002 break;
1003 case VBR_ALT_CURVE_SOFT:
1004 total2 +=
1005 dbytes *
1006 (state->alt_curve_mid_qual + state->alt_curve_qual_dev *
1007 (1.0 - cos(DEG2RAD * ((dbytes - state->average_frame) * 90.0 / state->alt_curve_low_diff))));
1008 }
1009 }
1010 }
1011 }
1012 else {
1013 if (dbytes > state->average_frame) {
1014 total2 +=
1015 ((double)dbytes +
1016 (state->average_frame - dbytes) *
1017 state->curve_compression_high / 100.0);
1018 }
1019 else {
1020 total2 +=
1021 ((double)dbytes +
1022 (state->average_frame - dbytes) *
1023 state->curve_compression_low / 100.0);
1024 }
1025 }
1026 }
1027 }
1028
1029 state->curve_comp_scale = total1 / total2;
1030
1031 if (state->use_alt_curve) {
1032
1033 double curve_temp, dbytes;
1034 int newquant, percent;
1035 int oldquant = 1;
1036
1037 if (state->alt_curve_use_auto_bonus_bias)
1038 state->alt_curve_bonus_bias = state->alt_curve_min_rel_qual;
1039
1040 state->curve_bias_bonus =
1041 (total1 - total2) * (double)state->alt_curve_bonus_bias /
1042 (100.0 * (double)(state->nb_frames - util_creditsframes(state) - state->nb_keyframes));
1043 state->curve_comp_scale =
1044 ((total1 - total2) * (1.0 - (double)state->alt_curve_bonus_bias / 100.0) + total2) /
1045 total2;
1046
1047
1048 for (n=1; n <= (int)(state->alt_curve_high*2) + 1; n++) {
1049 dbytes = n;
1050 if (dbytes > state->average_frame)
1051 {
1052 if (dbytes >= state->alt_curve_high) {
1053 curve_temp = dbytes * (state->alt_curve_mid_qual - state->alt_curve_qual_dev);
1054 }
1055 else {
1056 switch(state->alt_curve_type) {
1057 case VBR_ALT_CURVE_AGGRESIVE:
1058 curve_temp = dbytes * (state->alt_curve_mid_qual - state->alt_curve_qual_dev *
1059 sin(DEG2RAD * ((dbytes - state->average_frame) * 90.0 / state->alt_curve_high_diff)));
1060 break;
1061 default:
1062 case VBR_ALT_CURVE_LINEAR:
1063 curve_temp = dbytes * (state->alt_curve_mid_qual - state->alt_curve_qual_dev *
1064 (dbytes - state->average_frame) / state->alt_curve_high_diff);
1065 break;
1066 case VBR_ALT_CURVE_SOFT:
1067 curve_temp = dbytes * (state->alt_curve_mid_qual - state->alt_curve_qual_dev *
1068 (1.0 - cos(DEG2RAD * ((dbytes - state->average_frame) * 90.0 / state->alt_curve_high_diff))));
1069 }
1070 }
1071 }
1072 else {
1073 if (dbytes <= state->alt_curve_low) {
1074 curve_temp = dbytes;
1075 }
1076 else {
1077 switch(state->alt_curve_type) {
1078 case VBR_ALT_CURVE_AGGRESIVE:
1079 curve_temp = dbytes * (state->alt_curve_mid_qual - state->alt_curve_qual_dev *
1080 sin(DEG2RAD * ((dbytes - state->average_frame) * 90.0 / state->alt_curve_low_diff)));
1081 break;
1082 default:
1083 case VBR_ALT_CURVE_LINEAR:
1084 curve_temp = dbytes * (state->alt_curve_mid_qual - state->alt_curve_qual_dev *
1085 (dbytes - state->average_frame) / state->alt_curve_low_diff);
1086 break;
1087 case VBR_ALT_CURVE_SOFT:
1088 curve_temp = dbytes * (state->alt_curve_mid_qual + state->alt_curve_qual_dev *
1089 (1.0 - cos(DEG2RAD * ((dbytes - state->average_frame) * 90.0 / state->alt_curve_low_diff))));
1090 }
1091 }
1092 }
1093
1094 if (state->movie_curve > 1.0)
1095 dbytes *= state->movie_curve;
1096
1097 newquant = (int)(dbytes * 2.0 / (curve_temp * state->curve_comp_scale + state->curve_bias_bonus));
1098 if (newquant > 1)
1099 {
1100 if (newquant != oldquant)
1101 {
1102 oldquant = newquant;
1103 percent = (int)((n - state->average_frame) * 100.0 / state->average_frame);
1104 }
1105
1106 }
1107
1108 }
1109
1110 }
1111
1112 state->overflow = 0;
1113 state->KFoverflow = 0;
1114 state->KFoverflow_partial = 0;
1115 state->KF_idx = 1;
1116
1117 for (n=0 ; n < 32 ; n++) {
1118 state->quant_error[n] = 0.0;
1119 state->quant_count[n] = 0;
1120 }
1121
1122 state->curve_comp_error = 0.0;
1123 state->last_quant = 0;
1124
1125 /*
1126 * Above this frame size limit, normal vbr rules will not apply
1127 * This means :
1128 * 1 - Quant can de/increase more than -/+2 between 2 frames
1129 * 2 - Leads to artifacts because of 1
1130 */
1131 state->max_framesize = state->twopass_max_bitrate/state->fps;
1132
1133 /* Get back to the beginning of frame statistics */
1134 fseek(state->pass1_file, pos_firstframe, SEEK_SET);
1135
1136 /*
1137 * Small hack : We have to get next frame stats before the
1138 * getintra/quant calls
1139 * User clients update the data when they call vbrUpdate
1140 * we are just bypassing this because we don't have to update
1141 * the overflow and so on...
1142 */
1143 {
1144
1145 /* Fake vars */
1146 int next_hbytes, next_kblocks, next_mblocks, next_ublocks;
1147
1148 fscanf(state->pass1_file, "%d %d %d %d %d %d %d\n",
1149 &state->pass1_quant, &state->pass1_intra, &next_hbytes,
1150 &state->pass1_bytes, &next_kblocks, &next_mblocks,
1151 &next_ublocks);
1152
1153 }
1154
1155 /* Initialize the frame counter */
1156 state->cur_frame = 0;
1157 state->last_keyframe = 0;
1158
1159 return(0);
1160
1161 }
1162
1163 static int vbr_getquant_2pass2(void *sstate)
1164 {
1165
1166 int quant;
1167 int intra;
1168 int bytes1, bytes2;
1169 int overflow;
1170 int capped_to_max_framesize = 0;
1171 int KFdistance, KF_min_size;
1172 vbr_control_t *state = sstate;
1173
1174 bytes1 = state->pass1_bytes;
1175 overflow = state->overflow / 8;
1176 /* To shut up gcc warning */
1177 bytes2 = bytes1;
1178
1179
1180 if (state->pass1_intra)
1181 {
1182 overflow = 0;
1183 }
1184
1185 if (util_frametype(state) != FRAME_TYPE_NORMAL_MOVIE) {
1186
1187
1188 switch (state->credits_mode) {
1189 case VBR_CREDITS_MODE_QUANT :
1190 if (state->credits_quant_i != state->credits_quant_p) {
1191 quant = state->pass1_intra ?
1192 state->credits_quant_i:
1193 state->credits_quant_p;
1194 }
1195 else {
1196 quant = state->credits_quant_p;
1197 }
1198
1199 state->bytes1 = bytes1;
1200 state->bytes2 = bytes1;
1201 state->desired_bytes2 = bytes1;
1202 return(quant);
1203 default:
1204 case VBR_CREDITS_MODE_RATE :
1205 case VBR_CREDITS_MODE_SIZE :
1206 if(util_frametype(state) == FRAME_TYPE_STARTING_CREDITS)
1207 bytes2 = (int)(bytes1 / state->credits_start_curve);
1208 else
1209 bytes2 = (int)(bytes1 / state->credits_end_curve);
1210 break;
1211 }
1212 }
1213 else {
1214 /* Foxer: apply curve compression outside credits */
1215 double dbytes, curve_temp;
1216
1217 bytes2 = bytes1;
1218
1219 if (state->pass1_intra)
1220 dbytes = ((int)(bytes2 + bytes2 * state->keyframe_boost / 100)) /
1221 state->movie_curve;
1222 else
1223 dbytes = bytes2 / state->movie_curve;
1224
1225 /* spread the compression error accross payback_delay frames */
1226 if (state->bitrate_payback_method == VBR_PAYBACK_BIAS) {
1227 bytes2 = (int)(state->curve_comp_error / state->bitrate_payback_delay);
1228 }
1229 else {
1230 bytes2 = (int)(state->curve_comp_error * dbytes /
1231 state->average_frame / state->bitrate_payback_delay);
1232
1233 if (labs(bytes2) > fabs(state->curve_comp_error))
1234 bytes2 = (int)state->curve_comp_error;
1235 }
1236
1237 state->curve_comp_error -= bytes2;
1238
1239 if (state->use_alt_curve) {
1240
1241 if (!state->pass1_intra) {
1242
1243 if (dbytes > state->average_frame) {
1244 if (dbytes >= state->alt_curve_high)
1245 curve_temp = dbytes * (state->alt_curve_mid_qual - state->alt_curve_qual_dev);
1246 else {
1247 switch(state->alt_curve_type) {
1248 case VBR_ALT_CURVE_AGGRESIVE:
1249 curve_temp = dbytes * (state->alt_curve_mid_qual - state->alt_curve_qual_dev *
1250 sin(DEG2RAD * ((dbytes - state->average_frame) * 90.0 / state->alt_curve_high_diff)));
1251 break;
1252 default:
1253 case VBR_ALT_CURVE_LINEAR:
1254 curve_temp = dbytes * (state->alt_curve_mid_qual - state->alt_curve_qual_dev *
1255 (dbytes - state->average_frame) / state->alt_curve_high_diff);
1256 break;
1257 case VBR_ALT_CURVE_SOFT:
1258 curve_temp = dbytes * (state->alt_curve_mid_qual - state->alt_curve_qual_dev *
1259 (1.0 - cos(DEG2RAD * ((dbytes - state->average_frame) * 90.0 / state->alt_curve_high_diff))));
1260 }
1261 }
1262 }
1263 else {
1264 if (dbytes <= state->alt_curve_low)
1265 curve_temp = dbytes;
1266 else {
1267 switch(state->alt_curve_type) {
1268 case VBR_ALT_CURVE_AGGRESIVE:
1269 curve_temp = dbytes * (state->alt_curve_mid_qual - state->alt_curve_qual_dev *
1270 sin(DEG2RAD * ((dbytes - state->average_frame) * 90.0 / state->alt_curve_low_diff)));
1271 break;
1272 default:
1273 case VBR_ALT_CURVE_LINEAR:
1274 curve_temp = dbytes * (state->alt_curve_mid_qual - state->alt_curve_qual_dev *
1275 (dbytes - state->average_frame) / state->alt_curve_low_diff);
1276 break;
1277 case VBR_ALT_CURVE_SOFT:
1278 curve_temp = dbytes * (state->alt_curve_mid_qual + state->alt_curve_qual_dev *
1279 (1.0 - cos(DEG2RAD * ((dbytes - state->average_frame) * 90.0 / state->alt_curve_low_diff))));
1280 }
1281 }
1282 }
1283
1284 curve_temp = curve_temp * state->curve_comp_scale + state->curve_bias_bonus;
1285
1286 bytes2 += ((int)curve_temp);
1287 state->curve_comp_error += curve_temp - ((int)curve_temp);
1288
1289 }
1290 else {
1291 state->curve_comp_error += dbytes - ((int)dbytes);
1292 bytes2 += ((int)dbytes);
1293 }
1294 }
1295 else if ((state->curve_compression_high + state->curve_compression_low) &&
1296 !state->pass1_intra) {
1297
1298 if (dbytes > state->average_frame) {
1299 curve_temp = state->curve_comp_scale *
1300 ((double)dbytes + (state->average_frame - dbytes) *
1301 state->curve_compression_high / 100.0);
1302 }
1303 else {
1304 curve_temp = state->curve_comp_scale *
1305 ((double)dbytes + (state->average_frame - dbytes) *
1306 state->curve_compression_low / 100.0);
1307 }
1308
1309 bytes2 += ((int)curve_temp);
1310 state->curve_comp_error += curve_temp - ((int)curve_temp);
1311 }
1312 else {
1313 state->curve_comp_error += dbytes - ((int)dbytes);
1314 bytes2 += ((int)dbytes);
1315 }
1316
1317 /* cap bytes2 to first pass size, lowers number of quant=1 frames */
1318 if (bytes2 > bytes1) {
1319 state->curve_comp_error += bytes2 - bytes1;
1320 bytes2 = bytes1;
1321 }
1322 else if (bytes2 < 1) {
1323 state->curve_comp_error += --bytes2;
1324 bytes2 = 1;
1325 }
1326 }
1327
1328 state->desired_bytes2 = bytes2;
1329
1330 /* Ugly dependence between getquant and getintra */
1331 intra = state->getintra(state);
1332
1333 if(intra) {
1334
1335 KFdistance = state->keyframe_locations[state->KF_idx] -
1336 state->keyframe_locations[state->KF_idx - 1];
1337
1338 if (KFdistance < state->kftreshold) {
1339 KFdistance = KFdistance - state->min_key_interval;
1340
1341 if (KFdistance >= 0) {
1342
1343 KF_min_size = bytes2 * (100 - state->kfreduction) / 100;
1344 if (KF_min_size < 1)
1345 KF_min_size = 1;
1346
1347 bytes2 = KF_min_size + (bytes2 - KF_min_size) * KFdistance /
1348 (state->kftreshold - state->min_key_interval);
1349
1350 if (bytes2 < 1)
1351 bytes2 = 1;
1352 }
1353 }
1354 }
1355
1356 /*
1357 * Foxer: scale overflow in relation to average size, so smaller frames don't get
1358 * too much/little bitrate
1359 */
1360 overflow = (int)((double)overflow * bytes2 / state->average_frame);
1361
1362 /* Foxer: reign in overflow with huge frames */
1363 if (labs(overflow) > labs(state->overflow)) {
1364 overflow = state->overflow;
1365 }
1366
1367 /* Foxer: make sure overflow doesn't run away */
1368 if(overflow > bytes2 * state->twopass_max_overflow_improvement / 100) {
1369 bytes2 += (overflow <= bytes2) ? bytes2 * state->twopass_max_overflow_improvement / 100 :
1370 overflow * state->twopass_max_overflow_improvement / 100;
1371 }
1372 else if(overflow < bytes2 * state->twopass_max_overflow_degradation / -100) {
1373 bytes2 += bytes2 * state->twopass_max_overflow_degradation / -100;
1374 }
1375 else {
1376 bytes2 += overflow;
1377 }
1378
1379 if(bytes2 > state->max_framesize) {
1380 capped_to_max_framesize = 1;
1381 bytes2 = state->max_framesize;
1382 }
1383
1384 if(bytes2 < 1) {
1385 bytes2 = 1;
1386 }
1387
1388 state->bytes1 = bytes1;
1389 state->bytes2 = bytes2;
1390
1391 /* very 'simple' quant<->filesize relationship */
1392 quant = state->pass1_quant * bytes1 / bytes2;
1393
1394 if(quant < 1)
1395 quant = 1;
1396 else if(quant > 31)
1397 quant = 31;
1398 else if(!state->pass1_intra) {
1399
1400 /* Foxer: aid desired quantizer precision by accumulating decision error */
1401 state->quant_error[quant] += ((double)(state->pass1_quant * bytes1) / bytes2) - quant;
1402
1403 if (state->quant_error[quant] >= 1.0) {
1404 state->quant_error[quant] -= 1.0;
1405 quant++;
1406 }
1407 }
1408
1409 /* we're done with credits */
1410 if(util_frametype(state) != FRAME_TYPE_NORMAL_MOVIE) {
1411 return(quant);
1412 }
1413
1414 if(intra) {
1415
1416 if (quant < state->min_iquant)
1417 quant = state->min_iquant;
1418 if (quant > state->max_iquant)
1419 quant = state->max_iquant;
1420 }
1421 else {
1422
1423 if(quant > state->max_pquant)
1424 quant = state->max_pquant;
1425 if(quant < state->min_pquant)
1426 quant = state->min_pquant;
1427
1428 /* subsequent frame quants can only be +- 2 */
1429 if(state->last_quant && capped_to_max_framesize == 0) {
1430 if (quant > state->last_quant + 2)
1431 quant = state->last_quant + 2;
1432 if (quant < state->last_quant - 2)
1433 quant = state->last_quant - 2;
1434 }
1435 }
1436
1437 return(quant);
1438
1439 }
1440
1441 static int vbr_getintra_2pass2(void *sstate)
1442 {
1443
1444 int intra;
1445 vbr_control_t *state = sstate;
1446
1447
1448 /* Get next intra state (fetched by update) */
1449 intra = state->pass1_intra;
1450
1451 /* During credits, XviD will decide itself */
1452 if(util_frametype(state) != FRAME_TYPE_NORMAL_MOVIE) {
1453
1454
1455 switch(state->credits_mode) {
1456 default:
1457 case VBR_CREDITS_MODE_RATE :
1458 case VBR_CREDITS_MODE_SIZE :
1459 intra = -1;
1460 break;
1461 case VBR_CREDITS_MODE_QUANT :
1462 /* Except in this case */
1463 if (state->credits_quant_i == state->credits_quant_p)
1464 intra = -1;
1465 break;
1466 }
1467
1468 }
1469
1470 /* Force I Frame when max_key_interval is reached */
1471 if((state->cur_frame - state->last_keyframe) > state->max_key_interval)
1472 intra = 1;
1473
1474 /*
1475 * Force P or B Frames for frames whose distance is less than the
1476 * requested minimum
1477 */
1478 if((state->cur_frame - state->last_keyframe) < state->min_key_interval)
1479 intra = 0;
1480
1481
1482 /* Return the given intra mode except for first frame */
1483 return((state->cur_frame==0)?1:intra);
1484
1485 }
1486
1487 static int vbr_update_2pass2(void *sstate,
1488 int quant,
1489 int intra,
1490 int header_bytes,
1491 int total_bytes,
1492 int kblocks,
1493 int mblocks,
1494 int ublocks)
1495
1496
1497 {
1498
1499
1500 int next_hbytes, next_kblocks, next_mblocks, next_ublocks;
1501 int tempdiv;
1502
1503 vbr_control_t *state = sstate;
1504
1505 /*
1506 * We do not depend on getintra/quant because we have the real results
1507 * from the xvid core
1508 */
1509
1510 if (util_frametype(state) == FRAME_TYPE_NORMAL_MOVIE) {
1511
1512 state->quant_count[quant]++;
1513
1514 if (state->pass1_intra) {
1515
1516 state->overflow += state->KFoverflow;
1517 state->KFoverflow = state->desired_bytes2 - total_bytes;
1518
1519 tempdiv = (state->keyframe_locations[state->KF_idx] -
1520 state->keyframe_locations[state->KF_idx - 1]);
1521
1522 /* redistribute correctly (by koepi) */
1523 if (tempdiv > 1) {
1524 /* non-consecutive keyframes */
1525 state->KFoverflow_partial = state->KFoverflow /
1526 (tempdiv - 1);
1527 }
1528 else {
1529 state->overflow += state->KFoverflow;
1530 state->KFoverflow = 0;
1531 state->KFoverflow_partial = 0;
1532 }
1533 state->KF_idx++;
1534
1535 }
1536 else {
1537 state->overflow += state->desired_bytes2 - total_bytes +
1538 state->KFoverflow_partial;
1539 state->KFoverflow -= state->KFoverflow_partial;
1540 }
1541 }
1542 else {
1543
1544 state->overflow += state->desired_bytes2 - total_bytes;
1545 state->overflow += state->KFoverflow;
1546 state->KFoverflow = 0;
1547 state->KFoverflow_partial = 0;
1548 }
1549
1550 /* Save old quant */
1551 state->last_quant = quant;
1552
1553 /* Update next frame data */
1554 fscanf(state->pass1_file, "%d %d %d %d %d %d %d\n",
1555 &state->pass1_quant, &state->pass1_intra, &next_hbytes,
1556 &state->pass1_bytes, &next_kblocks, &next_mblocks,
1557 &next_ublocks);
1558
1559 /* Save the last Keyframe pos */
1560 if(intra)
1561 state->last_keyframe = state->cur_frame;
1562
1563 /* Ok next frame */
1564 state->cur_frame++;
1565
1566 return(0);
1567
1568 }
1569
1570 static int vbr_finish_2pass2(void *sstate)
1571 {
1572
1573 vbr_control_t *state = sstate;
1574
1575 if(state->pass1_file == NULL)
1576 return(-1);
1577
1578 /* Close the file */
1579 if(fclose(state->pass1_file) != 0)
1580 return(-1);
1581
1582 /* Free the memory */
1583 if(state->keyframe_locations)
1584 free(state->keyframe_locations);
1585
1586 return(0);
1587
1588 }
1589
1590
1591 /******************************************************************************
1592 * Fixed quant mode - Most of the functions will be dummy functions
1593 *****************************************************************************/
1594
1595 static int vbr_init_fixedquant(void *sstate)
1596 {
1597
1598 vbr_control_t *state = sstate;
1599
1600 if(state->fixed_quant < 1)
1601 state->fixed_quant = 1;
1602
1603 if(state->fixed_quant > 31)
1604 state->fixed_quant = 31;
1605
1606 state->cur_frame = 0;
1607
1608 return(0);
1609
1610 }
1611
1612 static int vbr_getquant_fixedquant(void *sstate)
1613 {
1614
1615 vbr_control_t *state = sstate;
1616
1617 /* Credits' frame ? */
1618 if(util_frametype(state) != FRAME_TYPE_NORMAL_MOVIE) {
1619
1620 int quant;
1621
1622 switch(state->credits_mode) {
1623 case VBR_CREDITS_MODE_RATE:
1624 quant = state->fixed_quant * state->credits_quant_ratio;
1625 break;
1626 case VBR_CREDITS_MODE_QUANT:
1627 quant = state->credits_fixed_quant;
1628 break;
1629 default:
1630 quant = state->fixed_quant;
1631
1632 }
1633
1634 return(quant);
1635
1636 }
1637
1638 /* No credit frame - return fixed quant */
1639 return(state->fixed_quant);
1640
1641 }
1642
1643 static int vbr_getintra_fixedquant(void *state)
1644 {
1645
1646 return(-1);
1647
1648 }
mplayer with SMedia Glamo drivers