lowres width/height cleanup 3rd try
[libav.git] / libavcodec / utils.c
1 /*
2 * utils for libavcodec
3 * Copyright (c) 2001 Fabrice Bellard.
4 * Copyright (c) 2003 Michel Bardiaux for the av_log API
5 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
6 *
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21
22 /**
23 * @file utils.c
24 * utils.
25 */
26
27 #include "avcodec.h"
28 #include "dsputil.h"
29 #include "mpegvideo.h"
30 #include "integer.h"
31 #include <stdarg.h>
32 #include <limits.h>
33
34 void avcodec_default_free_buffers(AVCodecContext *s);
35
36 void *av_mallocz(unsigned int size)
37 {
38 void *ptr;
39
40 ptr = av_malloc(size);
41 if (!ptr)
42 return NULL;
43 memset(ptr, 0, size);
44 return ptr;
45 }
46
47 char *av_strdup(const char *s)
48 {
49 char *ptr;
50 int len;
51 len = strlen(s) + 1;
52 ptr = av_malloc(len);
53 if (!ptr)
54 return NULL;
55 memcpy(ptr, s, len);
56 return ptr;
57 }
58
59 /**
60 * realloc which does nothing if the block is large enough
61 */
62 void *av_fast_realloc(void *ptr, unsigned int *size, unsigned int min_size)
63 {
64 if(min_size < *size)
65 return ptr;
66
67 *size= 17*min_size/16 + 32;
68
69 return av_realloc(ptr, *size);
70 }
71
72
73 static unsigned int last_static = 0;
74 static unsigned int allocated_static = 0;
75 static void** array_static = NULL;
76
77 /**
78 * allocation of static arrays - do not use for normal allocation.
79 */
80 void *av_mallocz_static(unsigned int size)
81 {
82 void *ptr = av_mallocz(size);
83
84 if(ptr){
85 array_static =av_fast_realloc(array_static, &allocated_static, sizeof(void*)*(last_static+1));
86 array_static[last_static++] = ptr;
87 }
88
89 return ptr;
90 }
91
92 /**
93 * free all static arrays and reset pointers to 0.
94 */
95 void av_free_static(void)
96 {
97 while(last_static){
98 av_freep(&array_static[--last_static]);
99 }
100 av_freep(&array_static);
101 }
102
103 /**
104 * Frees memory and sets the pointer to NULL.
105 * @param arg pointer to the pointer which should be freed
106 */
107 void av_freep(void *arg)
108 {
109 void **ptr= (void**)arg;
110 av_free(*ptr);
111 *ptr = NULL;
112 }
113
114 /* encoder management */
115 AVCodec *first_avcodec = NULL;
116
117 void register_avcodec(AVCodec *format)
118 {
119 AVCodec **p;
120 p = &first_avcodec;
121 while (*p != NULL) p = &(*p)->next;
122 *p = format;
123 format->next = NULL;
124 }
125
126 void avcodec_set_dimensions(AVCodecContext *s, int width, int height){
127 s->coded_width = width;
128 s->coded_height= height;
129 s->width = -((-width )>>s->lowres);
130 s->height= -((-height)>>s->lowres);
131 }
132
133 typedef struct InternalBuffer{
134 int last_pic_num;
135 uint8_t *base[4];
136 uint8_t *data[4];
137 int linesize[4];
138 }InternalBuffer;
139
140 #define INTERNAL_BUFFER_SIZE 32
141
142 #define ALIGN(x, a) (((x)+(a)-1)&~((a)-1))
143
144 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height){
145 int w_align= 1;
146 int h_align= 1;
147
148 switch(s->pix_fmt){
149 case PIX_FMT_YUV420P:
150 case PIX_FMT_YUV422:
151 case PIX_FMT_UYVY422:
152 case PIX_FMT_YUV422P:
153 case PIX_FMT_YUV444P:
154 case PIX_FMT_GRAY8:
155 case PIX_FMT_YUVJ420P:
156 case PIX_FMT_YUVJ422P:
157 case PIX_FMT_YUVJ444P:
158 w_align= 16; //FIXME check for non mpeg style codecs and use less alignment
159 h_align= 16;
160 break;
161 case PIX_FMT_YUV411P:
162 w_align=32;
163 h_align=8;
164 break;
165 case PIX_FMT_YUV410P:
166 if(s->codec_id == CODEC_ID_SVQ1){
167 w_align=64;
168 h_align=64;
169 }
170 case PIX_FMT_RGB555:
171 if(s->codec_id == CODEC_ID_RPZA){
172 w_align=4;
173 h_align=4;
174 }
175 case PIX_FMT_PAL8:
176 if(s->codec_id == CODEC_ID_SMC){
177 w_align=4;
178 h_align=4;
179 }
180 break;
181 default:
182 w_align= 1;
183 h_align= 1;
184 break;
185 }
186
187 *width = ALIGN(*width , w_align);
188 *height= ALIGN(*height, h_align);
189 }
190
191 int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic){
192 int i;
193 int w= s->width;
194 int h= s->height;
195 InternalBuffer *buf;
196 int *picture_number;
197
198 assert(pic->data[0]==NULL);
199 assert(INTERNAL_BUFFER_SIZE > s->internal_buffer_count);
200
201 if(s->internal_buffer==NULL){
202 s->internal_buffer= av_mallocz(INTERNAL_BUFFER_SIZE*sizeof(InternalBuffer));
203 }
204 #if 0
205 s->internal_buffer= av_fast_realloc(
206 s->internal_buffer,
207 &s->internal_buffer_size,
208 sizeof(InternalBuffer)*FFMAX(99, s->internal_buffer_count+1)/*FIXME*/
209 );
210 #endif
211
212 buf= &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
213 picture_number= &(((InternalBuffer*)s->internal_buffer)[INTERNAL_BUFFER_SIZE-1]).last_pic_num; //FIXME ugly hack
214 (*picture_number)++;
215
216 if(buf->base[0]){
217 pic->age= *picture_number - buf->last_pic_num;
218 buf->last_pic_num= *picture_number;
219 }else{
220 int h_chroma_shift, v_chroma_shift;
221 int s_align, pixel_size;
222
223 avcodec_get_chroma_sub_sample(s->pix_fmt, &h_chroma_shift, &v_chroma_shift);
224
225 switch(s->pix_fmt){
226 case PIX_FMT_RGB555:
227 case PIX_FMT_RGB565:
228 case PIX_FMT_YUV422:
229 case PIX_FMT_UYVY422:
230 pixel_size=2;
231 break;
232 case PIX_FMT_RGB24:
233 case PIX_FMT_BGR24:
234 pixel_size=3;
235 break;
236 case PIX_FMT_RGBA32:
237 pixel_size=4;
238 break;
239 default:
240 pixel_size=1;
241 }
242
243 avcodec_align_dimensions(s, &w, &h);
244 #if defined(ARCH_POWERPC) || defined(HAVE_MMI) //FIXME some cleaner check
245 s_align= 16;
246 #else
247 s_align= 8;
248 #endif
249
250 if(!(s->flags&CODEC_FLAG_EMU_EDGE)){
251 w+= EDGE_WIDTH*2;
252 h+= EDGE_WIDTH*2;
253 }
254
255 buf->last_pic_num= -256*256*256*64;
256
257 for(i=0; i<3; i++){
258 const int h_shift= i==0 ? 0 : h_chroma_shift;
259 const int v_shift= i==0 ? 0 : v_chroma_shift;
260
261 //FIXME next ensures that linesize= 2^x uvlinesize, thats needed because some MC code assumes it
262 buf->linesize[i]= ALIGN(pixel_size*w>>h_shift, s_align<<(h_chroma_shift-h_shift));
263
264 buf->base[i]= av_mallocz((buf->linesize[i]*h>>v_shift)+16); //FIXME 16
265 if(buf->base[i]==NULL) return -1;
266 memset(buf->base[i], 128, buf->linesize[i]*h>>v_shift);
267
268 if(s->flags&CODEC_FLAG_EMU_EDGE)
269 buf->data[i] = buf->base[i];
270 else
271 buf->data[i] = buf->base[i] + ALIGN((buf->linesize[i]*EDGE_WIDTH>>v_shift) + (EDGE_WIDTH>>h_shift), s_align);
272 }
273 pic->age= 256*256*256*64;
274 }
275 pic->type= FF_BUFFER_TYPE_INTERNAL;
276
277 for(i=0; i<4; i++){
278 pic->base[i]= buf->base[i];
279 pic->data[i]= buf->data[i];
280 pic->linesize[i]= buf->linesize[i];
281 }
282 s->internal_buffer_count++;
283
284 return 0;
285 }
286
287 void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic){
288 int i;
289 InternalBuffer *buf, *last, temp;
290
291 assert(pic->type==FF_BUFFER_TYPE_INTERNAL);
292 assert(s->internal_buffer_count);
293
294 buf = NULL; /* avoids warning */
295 for(i=0; i<s->internal_buffer_count; i++){ //just 3-5 checks so is not worth to optimize
296 buf= &((InternalBuffer*)s->internal_buffer)[i];
297 if(buf->data[0] == pic->data[0])
298 break;
299 }
300 assert(i < s->internal_buffer_count);
301 s->internal_buffer_count--;
302 last = &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
303
304 temp= *buf;
305 *buf= *last;
306 *last= temp;
307
308 for(i=0; i<3; i++){
309 pic->data[i]=NULL;
310 // pic->base[i]=NULL;
311 }
312 //printf("R%X\n", pic->opaque);
313 }
314
315 int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic){
316 AVFrame temp_pic;
317 int i;
318
319 /* If no picture return a new buffer */
320 if(pic->data[0] == NULL) {
321 /* We will copy from buffer, so must be readable */
322 pic->buffer_hints |= FF_BUFFER_HINTS_READABLE;
323 return s->get_buffer(s, pic);
324 }
325
326 /* If internal buffer type return the same buffer */
327 if(pic->type == FF_BUFFER_TYPE_INTERNAL)
328 return 0;
329
330 /*
331 * Not internal type and reget_buffer not overridden, emulate cr buffer
332 */
333 temp_pic = *pic;
334 for(i = 0; i < 4; i++)
335 pic->data[i] = pic->base[i] = NULL;
336 pic->opaque = NULL;
337 /* Allocate new frame */
338 if (s->get_buffer(s, pic))
339 return -1;
340 /* Copy image data from old buffer to new buffer */
341 img_copy((AVPicture*)pic, (AVPicture*)&temp_pic, s->pix_fmt, s->width,
342 s->height);
343 s->release_buffer(s, &temp_pic); // Release old frame
344 return 0;
345 }
346
347 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void **arg, int *ret, int count){
348 int i;
349
350 for(i=0; i<count; i++){
351 int r= func(c, arg[i]);
352 if(ret) ret[i]= r;
353 }
354 return 0;
355 }
356
357 enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat * fmt){
358 return fmt[0];
359 }
360
361 static const char* context_to_name(void* ptr) {
362 AVCodecContext *avc= ptr;
363
364 if(avc && avc->codec && avc->codec->name)
365 return avc->codec->name;
366 else
367 return "NULL";
368 }
369
370 static AVClass av_codec_context_class = { "AVCodecContext", context_to_name };
371
372 void avcodec_get_context_defaults(AVCodecContext *s){
373 memset(s, 0, sizeof(AVCodecContext));
374
375 s->av_class= &av_codec_context_class;
376 s->bit_rate= 800*1000;
377 s->bit_rate_tolerance= s->bit_rate*10;
378 s->qmin= 2;
379 s->qmax= 31;
380 s->mb_qmin= 2;
381 s->mb_qmax= 31;
382 s->rc_eq= "tex^qComp";
383 s->qcompress= 0.5;
384 s->max_qdiff= 3;
385 s->b_quant_factor=1.25;
386 s->b_quant_offset=1.25;
387 s->i_quant_factor=-0.8;
388 s->i_quant_offset=0.0;
389 s->error_concealment= 3;
390 s->error_resilience= 1;
391 s->workaround_bugs= FF_BUG_AUTODETECT;
392 s->frame_rate_base= 1;
393 s->frame_rate = 25;
394 s->gop_size= 50;
395 s->me_method= ME_EPZS;
396 s->get_buffer= avcodec_default_get_buffer;
397 s->release_buffer= avcodec_default_release_buffer;
398 s->get_format= avcodec_default_get_format;
399 s->execute= avcodec_default_execute;
400 s->thread_count=1;
401 s->me_subpel_quality=8;
402 s->lmin= FF_QP2LAMBDA * s->qmin;
403 s->lmax= FF_QP2LAMBDA * s->qmax;
404 s->sample_aspect_ratio= (AVRational){0,1};
405 s->ildct_cmp= FF_CMP_VSAD;
406 s->profile= FF_PROFILE_UNKNOWN;
407 s->level= FF_LEVEL_UNKNOWN;
408
409 s->intra_quant_bias= FF_DEFAULT_QUANT_BIAS;
410 s->inter_quant_bias= FF_DEFAULT_QUANT_BIAS;
411 s->palctrl = NULL;
412 s->reget_buffer= avcodec_default_reget_buffer;
413 }
414
415 /**
416 * allocates a AVCodecContext and set it to defaults.
417 * this can be deallocated by simply calling free()
418 */
419 AVCodecContext *avcodec_alloc_context(void){
420 AVCodecContext *avctx= av_malloc(sizeof(AVCodecContext));
421
422 if(avctx==NULL) return NULL;
423
424 avcodec_get_context_defaults(avctx);
425
426 return avctx;
427 }
428
429 void avcodec_get_frame_defaults(AVFrame *pic){
430 memset(pic, 0, sizeof(AVFrame));
431
432 pic->pts= AV_NOPTS_VALUE;
433 }
434
435 /**
436 * allocates a AVPFrame and set it to defaults.
437 * this can be deallocated by simply calling free()
438 */
439 AVFrame *avcodec_alloc_frame(void){
440 AVFrame *pic= av_malloc(sizeof(AVFrame));
441
442 if(pic==NULL) return NULL;
443
444 avcodec_get_frame_defaults(pic);
445
446 return pic;
447 }
448
449 int avcodec_open(AVCodecContext *avctx, AVCodec *codec)
450 {
451 int ret;
452
453 if(avctx->codec)
454 return -1;
455
456 avctx->codec = codec;
457 avctx->codec_id = codec->id;
458 avctx->frame_number = 0;
459 if (codec->priv_data_size > 0) {
460 avctx->priv_data = av_mallocz(codec->priv_data_size);
461 if (!avctx->priv_data)
462 return -ENOMEM;
463 } else {
464 avctx->priv_data = NULL;
465 }
466
467 if(avctx->coded_width && avctx->coded_height)
468 avcodec_set_dimensions(avctx, avctx->coded_width, avctx->coded_height);
469 else if(avctx->width && avctx->height)
470 avcodec_set_dimensions(avctx, avctx->width, avctx->height);
471
472 ret = avctx->codec->init(avctx);
473 if (ret < 0) {
474 av_freep(&avctx->priv_data);
475 return ret;
476 }
477 return 0;
478 }
479
480 int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size,
481 const short *samples)
482 {
483 if((avctx->codec->capabilities & CODEC_CAP_DELAY) || samples){
484 int ret = avctx->codec->encode(avctx, buf, buf_size, (void *)samples);
485 avctx->frame_number++;
486 return ret;
487 }else
488 return 0;
489 }
490
491 int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
492 const AVFrame *pict)
493 {
494 if((avctx->codec->capabilities & CODEC_CAP_DELAY) || pict){
495 int ret = avctx->codec->encode(avctx, buf, buf_size, (void *)pict);
496 avctx->frame_number++;
497 emms_c(); //needed to avoid a emms_c() call before every return;
498
499 return ret;
500 }else
501 return 0;
502 }
503
504 /**
505 * decode a frame.
506 * @param buf bitstream buffer, must be FF_INPUT_BUFFER_PADDING_SIZE larger then the actual read bytes
507 * because some optimized bitstream readers read 32 or 64 bit at once and could read over the end
508 * @param buf_size the size of the buffer in bytes
509 * @param got_picture_ptr zero if no frame could be decompressed, Otherwise, it is non zero
510 * @return -1 if error, otherwise return the number of
511 * bytes used.
512 */
513 int avcodec_decode_video(AVCodecContext *avctx, AVFrame *picture,
514 int *got_picture_ptr,
515 uint8_t *buf, int buf_size)
516 {
517 int ret;
518
519 *got_picture_ptr= 0;
520 ret = avctx->codec->decode(avctx, picture, got_picture_ptr,
521 buf, buf_size);
522
523 emms_c(); //needed to avoid a emms_c() call before every return;
524
525 if (*got_picture_ptr)
526 avctx->frame_number++;
527 return ret;
528 }
529
530 /* decode an audio frame. return -1 if error, otherwise return the
531 *number of bytes used. If no frame could be decompressed,
532 *frame_size_ptr is zero. Otherwise, it is the decompressed frame
533 *size in BYTES. */
534 int avcodec_decode_audio(AVCodecContext *avctx, int16_t *samples,
535 int *frame_size_ptr,
536 uint8_t *buf, int buf_size)
537 {
538 int ret;
539
540 *frame_size_ptr= 0;
541 ret = avctx->codec->decode(avctx, samples, frame_size_ptr,
542 buf, buf_size);
543 avctx->frame_number++;
544 return ret;
545 }
546
547 int avcodec_close(AVCodecContext *avctx)
548 {
549 if (avctx->codec->close)
550 avctx->codec->close(avctx);
551 avcodec_default_free_buffers(avctx);
552 av_freep(&avctx->priv_data);
553 avctx->codec = NULL;
554 return 0;
555 }
556
557 AVCodec *avcodec_find_encoder(enum CodecID id)
558 {
559 AVCodec *p;
560 p = first_avcodec;
561 while (p) {
562 if (p->encode != NULL && p->id == id)
563 return p;
564 p = p->next;
565 }
566 return NULL;
567 }
568
569 AVCodec *avcodec_find_encoder_by_name(const char *name)
570 {
571 AVCodec *p;
572 p = first_avcodec;
573 while (p) {
574 if (p->encode != NULL && strcmp(name,p->name) == 0)
575 return p;
576 p = p->next;
577 }
578 return NULL;
579 }
580
581 AVCodec *avcodec_find_decoder(enum CodecID id)
582 {
583 AVCodec *p;
584 p = first_avcodec;
585 while (p) {
586 if (p->decode != NULL && p->id == id)
587 return p;
588 p = p->next;
589 }
590 return NULL;
591 }
592
593 AVCodec *avcodec_find_decoder_by_name(const char *name)
594 {
595 AVCodec *p;
596 p = first_avcodec;
597 while (p) {
598 if (p->decode != NULL && strcmp(name,p->name) == 0)
599 return p;
600 p = p->next;
601 }
602 return NULL;
603 }
604
605 static AVCodec *avcodec_find(enum CodecID id)
606 {
607 AVCodec *p;
608 p = first_avcodec;
609 while (p) {
610 if (p->id == id)
611 return p;
612 p = p->next;
613 }
614 return NULL;
615 }
616
617 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)
618 {
619 const char *codec_name;
620 AVCodec *p;
621 char buf1[32];
622 char channels_str[100];
623 int bitrate;
624
625 if (encode)
626 p = avcodec_find_encoder(enc->codec_id);
627 else
628 p = avcodec_find_decoder(enc->codec_id);
629
630 if (p) {
631 codec_name = p->name;
632 if (!encode && enc->codec_id == CODEC_ID_MP3) {
633 if (enc->sub_id == 2)
634 codec_name = "mp2";
635 else if (enc->sub_id == 1)
636 codec_name = "mp1";
637 }
638 } else if (enc->codec_id == CODEC_ID_MPEG2TS) {
639 /* fake mpeg2 transport stream codec (currently not
640 registered) */
641 codec_name = "mpeg2ts";
642 } else if (enc->codec_name[0] != '\0') {
643 codec_name = enc->codec_name;
644 } else {
645 /* output avi tags */
646 if (enc->codec_type == CODEC_TYPE_VIDEO) {
647 snprintf(buf1, sizeof(buf1), "%c%c%c%c",
648 enc->codec_tag & 0xff,
649 (enc->codec_tag >> 8) & 0xff,
650 (enc->codec_tag >> 16) & 0xff,
651 (enc->codec_tag >> 24) & 0xff);
652 } else {
653 snprintf(buf1, sizeof(buf1), "0x%04x", enc->codec_tag);
654 }
655 codec_name = buf1;
656 }
657
658 switch(enc->codec_type) {
659 case CODEC_TYPE_VIDEO:
660 snprintf(buf, buf_size,
661 "Video: %s%s",
662 codec_name, enc->mb_decision ? " (hq)" : "");
663 if (enc->codec_id == CODEC_ID_RAWVIDEO) {
664 snprintf(buf + strlen(buf), buf_size - strlen(buf),
665 ", %s",
666 avcodec_get_pix_fmt_name(enc->pix_fmt));
667 }
668 if (enc->width) {
669 snprintf(buf + strlen(buf), buf_size - strlen(buf),
670 ", %dx%d, %0.2f fps",
671 enc->width, enc->height,
672 (float)enc->frame_rate / enc->frame_rate_base);
673 }
674 if (encode) {
675 snprintf(buf + strlen(buf), buf_size - strlen(buf),
676 ", q=%d-%d", enc->qmin, enc->qmax);
677 }
678 bitrate = enc->bit_rate;
679 break;
680 case CODEC_TYPE_AUDIO:
681 snprintf(buf, buf_size,
682 "Audio: %s",
683 codec_name);
684 switch (enc->channels) {
685 case 1:
686 strcpy(channels_str, "mono");
687 break;
688 case 2:
689 strcpy(channels_str, "stereo");
690 break;
691 case 6:
692 strcpy(channels_str, "5:1");
693 break;
694 default:
695 sprintf(channels_str, "%d channels", enc->channels);
696 break;
697 }
698 if (enc->sample_rate) {
699 snprintf(buf + strlen(buf), buf_size - strlen(buf),
700 ", %d Hz, %s",
701 enc->sample_rate,
702 channels_str);
703 }
704
705 /* for PCM codecs, compute bitrate directly */
706 switch(enc->codec_id) {
707 case CODEC_ID_PCM_S16LE:
708 case CODEC_ID_PCM_S16BE:
709 case CODEC_ID_PCM_U16LE:
710 case CODEC_ID_PCM_U16BE:
711 bitrate = enc->sample_rate * enc->channels * 16;
712 break;
713 case CODEC_ID_PCM_S8:
714 case CODEC_ID_PCM_U8:
715 case CODEC_ID_PCM_ALAW:
716 case CODEC_ID_PCM_MULAW:
717 bitrate = enc->sample_rate * enc->channels * 8;
718 break;
719 default:
720 bitrate = enc->bit_rate;
721 break;
722 }
723 break;
724 case CODEC_TYPE_DATA:
725 snprintf(buf, buf_size, "Data: %s", codec_name);
726 bitrate = enc->bit_rate;
727 break;
728 default:
729 av_abort();
730 }
731 if (encode) {
732 if (enc->flags & CODEC_FLAG_PASS1)
733 snprintf(buf + strlen(buf), buf_size - strlen(buf),
734 ", pass 1");
735 if (enc->flags & CODEC_FLAG_PASS2)
736 snprintf(buf + strlen(buf), buf_size - strlen(buf),
737 ", pass 2");
738 }
739 if (bitrate != 0) {
740 snprintf(buf + strlen(buf), buf_size - strlen(buf),
741 ", %d kb/s", bitrate / 1000);
742 }
743 }
744
745 unsigned avcodec_version( void )
746 {
747 return LIBAVCODEC_VERSION_INT;
748 }
749
750 unsigned avcodec_build( void )
751 {
752 return LIBAVCODEC_BUILD;
753 }
754
755 /* must be called before any other functions */
756 void avcodec_init(void)
757 {
758 static int inited = 0;
759
760 if (inited != 0)
761 return;
762 inited = 1;
763
764 dsputil_static_init();
765 }
766
767 /**
768 * Flush buffers, should be called when seeking or when swicthing to a different stream.
769 */
770 void avcodec_flush_buffers(AVCodecContext *avctx)
771 {
772 if(avctx->codec->flush)
773 avctx->codec->flush(avctx);
774 }
775
776 void avcodec_default_free_buffers(AVCodecContext *s){
777 int i, j;
778
779 if(s->internal_buffer==NULL) return;
780
781 for(i=0; i<INTERNAL_BUFFER_SIZE; i++){
782 InternalBuffer *buf= &((InternalBuffer*)s->internal_buffer)[i];
783 for(j=0; j<4; j++){
784 av_freep(&buf->base[j]);
785 buf->data[j]= NULL;
786 }
787 }
788 av_freep(&s->internal_buffer);
789
790 s->internal_buffer_count=0;
791 }
792
793 char av_get_pict_type_char(int pict_type){
794 switch(pict_type){
795 case I_TYPE: return 'I';
796 case P_TYPE: return 'P';
797 case B_TYPE: return 'B';
798 case S_TYPE: return 'S';
799 case SI_TYPE:return 'i';
800 case SP_TYPE:return 'p';
801 default: return '?';
802 }
803 }
804
805 int av_reduce(int *dst_nom, int *dst_den, int64_t nom, int64_t den, int64_t max){
806 AVRational a0={0,1}, a1={1,0};
807 int sign= (nom<0) ^ (den<0);
808 int64_t gcd= ff_gcd(ABS(nom), ABS(den));
809
810 nom = ABS(nom)/gcd;
811 den = ABS(den)/gcd;
812 if(nom<=max && den<=max){
813 a1= (AVRational){nom, den};
814 den=0;
815 }
816
817 while(den){
818 int64_t x = nom / den;
819 int64_t next_den= nom - den*x;
820 int64_t a2n= x*a1.num + a0.num;
821 int64_t a2d= x*a1.den + a0.den;
822
823 if(a2n > max || a2d > max) break;
824
825 a0= a1;
826 a1= (AVRational){a2n, a2d};
827 nom= den;
828 den= next_den;
829 }
830 assert(ff_gcd(a1.num, a1.den) == 1);
831
832 *dst_nom = sign ? -a1.num : a1.num;
833 *dst_den = a1.den;
834
835 return den==0;
836 }
837
838 int64_t av_rescale_rnd(int64_t a, int64_t b, int64_t c, enum AVRounding rnd){
839 AVInteger ai;
840 int64_t r=0;
841 assert(c > 0);
842 assert(b >=0);
843 assert(rnd >=0 && rnd<=5 && rnd!=4);
844
845 if(a<0) return -av_rescale_rnd(-a, b, c, rnd ^ ((rnd>>1)&1));
846
847 if(rnd==AV_ROUND_NEAR_INF) r= c/2;
848 else if(rnd&1) r= c-1;
849
850 if(b<=INT_MAX && c<=INT_MAX){
851 if(a<=INT_MAX)
852 return (a * b + r)/c;
853 else
854 return a/c*b + (a%c*b + r)/c;
855 }
856
857 ai= av_mul_i(av_int2i(a), av_int2i(b));
858 ai= av_add_i(ai, av_int2i(r));
859
860 return av_i2int(av_div_i(ai, av_int2i(c)));
861 }
862
863 int64_t av_rescale(int64_t a, int64_t b, int64_t c){
864 return av_rescale_rnd(a, b, c, AV_ROUND_NEAR_INF);
865 }
866
867 /* av_log API */
868
869 static int av_log_level = AV_LOG_DEBUG;
870
871 static void av_log_default_callback(void* ptr, int level, const char* fmt, va_list vl)
872 {
873 static int print_prefix=1;
874 AVClass* avc= ptr ? *(AVClass**)ptr : NULL;
875 if(level>av_log_level)
876 return;
877 #undef fprintf
878 if(print_prefix && avc) {
879 fprintf(stderr, "[%s @ %p]", avc->item_name(ptr), avc);
880 }
881 #define fprintf please_use_av_log
882
883 print_prefix= strstr(fmt, "\n") != NULL;
884
885 vfprintf(stderr, fmt, vl);
886 }
887
888 static void (*av_log_callback)(void*, int, const char*, va_list) = av_log_default_callback;
889
890 void av_log(void* avcl, int level, const char *fmt, ...)
891 {
892 va_list vl;
893 va_start(vl, fmt);
894 av_vlog(avcl, level, fmt, vl);
895 va_end(vl);
896 }
897
898 void av_vlog(void* avcl, int level, const char *fmt, va_list vl)
899 {
900 av_log_callback(avcl, level, fmt, vl);
901 }
902
903 int av_log_get_level(void)
904 {
905 return av_log_level;
906 }
907
908 void av_log_set_level(int level)
909 {
910 av_log_level = level;
911 }
912
913 void av_log_set_callback(void (*callback)(void*, int, const char*, va_list))
914 {
915 av_log_callback = callback;
916 }
917
918 #if !defined(HAVE_PTHREADS) && !defined(HAVE_W32THREADS)
919 int avcodec_thread_init(AVCodecContext *s, int thread_count){
920 return -1;
921 }
922 #endif