various security fixes and precautionary checks
[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 const uint8_t ff_sqrt_tab[128]={
35 0, 1, 1, 1, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5,
36 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
37 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
38 9, 9, 9, 9,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,11,11,11,11,11,11,11
39 };
40
41 const uint8_t ff_log2_tab[256]={
42 0,0,1,1,2,2,2,2,3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
43 5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,
44 6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
45 6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
46 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
47 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
48 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
49 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7
50 };
51
52 void avcodec_default_free_buffers(AVCodecContext *s);
53
54 void *av_mallocz(unsigned int size)
55 {
56 void *ptr;
57
58 ptr = av_malloc(size);
59 if (!ptr)
60 return NULL;
61 memset(ptr, 0, size);
62 return ptr;
63 }
64
65 char *av_strdup(const char *s)
66 {
67 char *ptr;
68 int len;
69 len = strlen(s) + 1;
70 ptr = av_malloc(len);
71 if (!ptr)
72 return NULL;
73 memcpy(ptr, s, len);
74 return ptr;
75 }
76
77 /**
78 * realloc which does nothing if the block is large enough
79 */
80 void *av_fast_realloc(void *ptr, unsigned int *size, unsigned int min_size)
81 {
82 if(min_size < *size)
83 return ptr;
84
85 *size= FFMAX(17*min_size/16 + 32, min_size);
86
87 return av_realloc(ptr, *size);
88 }
89
90
91 static unsigned int last_static = 0;
92 static unsigned int allocated_static = 0;
93 static void** array_static = NULL;
94
95 /**
96 * allocation of static arrays - do not use for normal allocation.
97 */
98 void *av_mallocz_static(unsigned int size)
99 {
100 void *ptr = av_mallocz(size);
101
102 if(ptr){
103 array_static =av_fast_realloc(array_static, &allocated_static, sizeof(void*)*(last_static+1));
104 if(!array_static)
105 return NULL;
106 array_static[last_static++] = ptr;
107 }
108
109 return ptr;
110 }
111
112 /**
113 * same as above, but does realloc
114 */
115
116 void *av_realloc_static(void *ptr, unsigned int size)
117 {
118 int i;
119 if(!ptr)
120 return av_mallocz_static(size);
121 /* Look for the old ptr */
122 for(i = 0; i < last_static; i++) {
123 if(array_static[i] == ptr) {
124 array_static[i] = av_realloc(array_static[i], size);
125 return array_static[i];
126 }
127 }
128 return NULL;
129
130 }
131
132 /**
133 * free all static arrays and reset pointers to 0.
134 */
135 void av_free_static(void)
136 {
137 while(last_static){
138 av_freep(&array_static[--last_static]);
139 }
140 av_freep(&array_static);
141 }
142
143 /**
144 * Frees memory and sets the pointer to NULL.
145 * @param arg pointer to the pointer which should be freed
146 */
147 void av_freep(void *arg)
148 {
149 void **ptr= (void**)arg;
150 av_free(*ptr);
151 *ptr = NULL;
152 }
153
154 /* encoder management */
155 AVCodec *first_avcodec = NULL;
156
157 void register_avcodec(AVCodec *format)
158 {
159 AVCodec **p;
160 p = &first_avcodec;
161 while (*p != NULL) p = &(*p)->next;
162 *p = format;
163 format->next = NULL;
164 }
165
166 void avcodec_set_dimensions(AVCodecContext *s, int width, int height){
167 s->coded_width = width;
168 s->coded_height= height;
169 s->width = -((-width )>>s->lowres);
170 s->height= -((-height)>>s->lowres);
171 }
172
173 typedef struct InternalBuffer{
174 int last_pic_num;
175 uint8_t *base[4];
176 uint8_t *data[4];
177 int linesize[4];
178 }InternalBuffer;
179
180 #define INTERNAL_BUFFER_SIZE 32
181
182 #define ALIGN(x, a) (((x)+(a)-1)&~((a)-1))
183
184 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height){
185 int w_align= 1;
186 int h_align= 1;
187
188 switch(s->pix_fmt){
189 case PIX_FMT_YUV420P:
190 case PIX_FMT_YUV422:
191 case PIX_FMT_UYVY422:
192 case PIX_FMT_YUV422P:
193 case PIX_FMT_YUV444P:
194 case PIX_FMT_GRAY8:
195 case PIX_FMT_YUVJ420P:
196 case PIX_FMT_YUVJ422P:
197 case PIX_FMT_YUVJ444P:
198 w_align= 16; //FIXME check for non mpeg style codecs and use less alignment
199 h_align= 16;
200 break;
201 case PIX_FMT_YUV411P:
202 case PIX_FMT_UYVY411:
203 w_align=32;
204 h_align=8;
205 break;
206 case PIX_FMT_YUV410P:
207 if(s->codec_id == CODEC_ID_SVQ1){
208 w_align=64;
209 h_align=64;
210 }
211 case PIX_FMT_RGB555:
212 if(s->codec_id == CODEC_ID_RPZA){
213 w_align=4;
214 h_align=4;
215 }
216 case PIX_FMT_PAL8:
217 if(s->codec_id == CODEC_ID_SMC){
218 w_align=4;
219 h_align=4;
220 }
221 break;
222 case PIX_FMT_BGR24:
223 if((s->codec_id == CODEC_ID_MSZH) || (s->codec_id == CODEC_ID_ZLIB)){
224 w_align=4;
225 h_align=4;
226 }
227 break;
228 default:
229 w_align= 1;
230 h_align= 1;
231 break;
232 }
233
234 *width = ALIGN(*width , w_align);
235 *height= ALIGN(*height, h_align);
236 }
237
238 int avcodec_check_dimensions(void *av_log_ctx, unsigned int w, unsigned int h){
239 if((int)w>0 && (int)h>0 && (w+128)*(uint64_t)(h+128) < INT_MAX/4)
240 return 0;
241
242 av_log(av_log_ctx, AV_LOG_ERROR, "picture size invalid (%ux%u)\n", w, h);
243 return -1;
244 }
245
246 int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic){
247 int i;
248 int w= s->width;
249 int h= s->height;
250 InternalBuffer *buf;
251 int *picture_number;
252
253 assert(pic->data[0]==NULL);
254 assert(INTERNAL_BUFFER_SIZE > s->internal_buffer_count);
255
256 if(avcodec_check_dimensions(s,w,h))
257 return -1;
258
259 if(s->internal_buffer==NULL){
260 s->internal_buffer= av_mallocz(INTERNAL_BUFFER_SIZE*sizeof(InternalBuffer));
261 }
262 #if 0
263 s->internal_buffer= av_fast_realloc(
264 s->internal_buffer,
265 &s->internal_buffer_size,
266 sizeof(InternalBuffer)*FFMAX(99, s->internal_buffer_count+1)/*FIXME*/
267 );
268 #endif
269
270 buf= &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
271 picture_number= &(((InternalBuffer*)s->internal_buffer)[INTERNAL_BUFFER_SIZE-1]).last_pic_num; //FIXME ugly hack
272 (*picture_number)++;
273
274 if(buf->base[0]){
275 pic->age= *picture_number - buf->last_pic_num;
276 buf->last_pic_num= *picture_number;
277 }else{
278 int h_chroma_shift, v_chroma_shift;
279 int pixel_size;
280
281 avcodec_get_chroma_sub_sample(s->pix_fmt, &h_chroma_shift, &v_chroma_shift);
282
283 switch(s->pix_fmt){
284 case PIX_FMT_RGB555:
285 case PIX_FMT_RGB565:
286 case PIX_FMT_YUV422:
287 case PIX_FMT_UYVY422:
288 pixel_size=2;
289 break;
290 case PIX_FMT_RGB24:
291 case PIX_FMT_BGR24:
292 pixel_size=3;
293 break;
294 case PIX_FMT_RGBA32:
295 pixel_size=4;
296 break;
297 default:
298 pixel_size=1;
299 }
300
301 avcodec_align_dimensions(s, &w, &h);
302
303 if(!(s->flags&CODEC_FLAG_EMU_EDGE)){
304 w+= EDGE_WIDTH*2;
305 h+= EDGE_WIDTH*2;
306 }
307
308 buf->last_pic_num= -256*256*256*64;
309
310 for(i=0; i<3; i++){
311 const int h_shift= i==0 ? 0 : h_chroma_shift;
312 const int v_shift= i==0 ? 0 : v_chroma_shift;
313
314 //FIXME next ensures that linesize= 2^x uvlinesize, thats needed because some MC code assumes it
315 buf->linesize[i]= ALIGN(pixel_size*w>>h_shift, STRIDE_ALIGN<<(h_chroma_shift-h_shift));
316
317 buf->base[i]= av_mallocz((buf->linesize[i]*h>>v_shift)+16); //FIXME 16
318 if(buf->base[i]==NULL) return -1;
319 memset(buf->base[i], 128, buf->linesize[i]*h>>v_shift);
320
321 if(s->flags&CODEC_FLAG_EMU_EDGE)
322 buf->data[i] = buf->base[i];
323 else
324 buf->data[i] = buf->base[i] + ALIGN((buf->linesize[i]*EDGE_WIDTH>>v_shift) + (EDGE_WIDTH>>h_shift), STRIDE_ALIGN);
325 }
326 pic->age= 256*256*256*64;
327 }
328 pic->type= FF_BUFFER_TYPE_INTERNAL;
329
330 for(i=0; i<4; i++){
331 pic->base[i]= buf->base[i];
332 pic->data[i]= buf->data[i];
333 pic->linesize[i]= buf->linesize[i];
334 }
335 s->internal_buffer_count++;
336
337 return 0;
338 }
339
340 void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic){
341 int i;
342 InternalBuffer *buf, *last, temp;
343
344 assert(pic->type==FF_BUFFER_TYPE_INTERNAL);
345 assert(s->internal_buffer_count);
346
347 buf = NULL; /* avoids warning */
348 for(i=0; i<s->internal_buffer_count; i++){ //just 3-5 checks so is not worth to optimize
349 buf= &((InternalBuffer*)s->internal_buffer)[i];
350 if(buf->data[0] == pic->data[0])
351 break;
352 }
353 assert(i < s->internal_buffer_count);
354 s->internal_buffer_count--;
355 last = &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
356
357 temp= *buf;
358 *buf= *last;
359 *last= temp;
360
361 for(i=0; i<3; i++){
362 pic->data[i]=NULL;
363 // pic->base[i]=NULL;
364 }
365 //printf("R%X\n", pic->opaque);
366 }
367
368 int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic){
369 AVFrame temp_pic;
370 int i;
371
372 /* If no picture return a new buffer */
373 if(pic->data[0] == NULL) {
374 /* We will copy from buffer, so must be readable */
375 pic->buffer_hints |= FF_BUFFER_HINTS_READABLE;
376 return s->get_buffer(s, pic);
377 }
378
379 /* If internal buffer type return the same buffer */
380 if(pic->type == FF_BUFFER_TYPE_INTERNAL)
381 return 0;
382
383 /*
384 * Not internal type and reget_buffer not overridden, emulate cr buffer
385 */
386 temp_pic = *pic;
387 for(i = 0; i < 4; i++)
388 pic->data[i] = pic->base[i] = NULL;
389 pic->opaque = NULL;
390 /* Allocate new frame */
391 if (s->get_buffer(s, pic))
392 return -1;
393 /* Copy image data from old buffer to new buffer */
394 img_copy((AVPicture*)pic, (AVPicture*)&temp_pic, s->pix_fmt, s->width,
395 s->height);
396 s->release_buffer(s, &temp_pic); // Release old frame
397 return 0;
398 }
399
400 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void **arg, int *ret, int count){
401 int i;
402
403 for(i=0; i<count; i++){
404 int r= func(c, arg[i]);
405 if(ret) ret[i]= r;
406 }
407 return 0;
408 }
409
410 enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat * fmt){
411 return fmt[0];
412 }
413
414 static const char* context_to_name(void* ptr) {
415 AVCodecContext *avc= ptr;
416
417 if(avc && avc->codec && avc->codec->name)
418 return avc->codec->name;
419 else
420 return "NULL";
421 }
422
423 static AVClass av_codec_context_class = { "AVCodecContext", context_to_name };
424
425 void avcodec_get_context_defaults(AVCodecContext *s){
426 memset(s, 0, sizeof(AVCodecContext));
427
428 s->av_class= &av_codec_context_class;
429 s->bit_rate= 800*1000;
430 s->bit_rate_tolerance= s->bit_rate*10;
431 s->qmin= 2;
432 s->qmax= 31;
433 s->mb_qmin= 2;
434 s->mb_qmax= 31;
435 s->rc_eq= "tex^qComp";
436 s->qcompress= 0.5;
437 s->max_qdiff= 3;
438 s->b_quant_factor=1.25;
439 s->b_quant_offset=1.25;
440 s->i_quant_factor=-0.8;
441 s->i_quant_offset=0.0;
442 s->error_concealment= 3;
443 s->error_resilience= 1;
444 s->workaround_bugs= FF_BUG_AUTODETECT;
445 s->frame_rate_base= 1;
446 s->frame_rate = 25;
447 s->gop_size= 50;
448 s->me_method= ME_EPZS;
449 s->get_buffer= avcodec_default_get_buffer;
450 s->release_buffer= avcodec_default_release_buffer;
451 s->get_format= avcodec_default_get_format;
452 s->execute= avcodec_default_execute;
453 s->thread_count=1;
454 s->me_subpel_quality=8;
455 s->lmin= FF_QP2LAMBDA * s->qmin;
456 s->lmax= FF_QP2LAMBDA * s->qmax;
457 s->sample_aspect_ratio= (AVRational){0,1};
458 s->ildct_cmp= FF_CMP_VSAD;
459 s->profile= FF_PROFILE_UNKNOWN;
460 s->level= FF_LEVEL_UNKNOWN;
461
462 s->intra_quant_bias= FF_DEFAULT_QUANT_BIAS;
463 s->inter_quant_bias= FF_DEFAULT_QUANT_BIAS;
464 s->palctrl = NULL;
465 s->reget_buffer= avcodec_default_reget_buffer;
466 }
467
468 /**
469 * allocates a AVCodecContext and set it to defaults.
470 * this can be deallocated by simply calling free()
471 */
472 AVCodecContext *avcodec_alloc_context(void){
473 AVCodecContext *avctx= av_malloc(sizeof(AVCodecContext));
474
475 if(avctx==NULL) return NULL;
476
477 avcodec_get_context_defaults(avctx);
478
479 return avctx;
480 }
481
482 void avcodec_get_frame_defaults(AVFrame *pic){
483 memset(pic, 0, sizeof(AVFrame));
484
485 pic->pts= AV_NOPTS_VALUE;
486 }
487
488 /**
489 * allocates a AVPFrame and set it to defaults.
490 * this can be deallocated by simply calling free()
491 */
492 AVFrame *avcodec_alloc_frame(void){
493 AVFrame *pic= av_malloc(sizeof(AVFrame));
494
495 if(pic==NULL) return NULL;
496
497 avcodec_get_frame_defaults(pic);
498
499 return pic;
500 }
501
502 int avcodec_open(AVCodecContext *avctx, AVCodec *codec)
503 {
504 int ret;
505
506 if(avctx->codec)
507 return -1;
508
509 avctx->codec = codec;
510 avctx->codec_id = codec->id;
511 avctx->frame_number = 0;
512 if (codec->priv_data_size > 0) {
513 avctx->priv_data = av_mallocz(codec->priv_data_size);
514 if (!avctx->priv_data)
515 return -ENOMEM;
516 } else {
517 avctx->priv_data = NULL;
518 }
519
520 if(avctx->coded_width && avctx->coded_height)
521 avcodec_set_dimensions(avctx, avctx->coded_width, avctx->coded_height);
522 else if(avctx->width && avctx->height)
523 avcodec_set_dimensions(avctx, avctx->width, avctx->height);
524
525 if((avctx->coded_width||avctx->coded_height) && avcodec_check_dimensions(avctx,avctx->coded_width,avctx->coded_height)){
526 av_freep(&avctx->priv_data);
527 return -1;
528 }
529
530 ret = avctx->codec->init(avctx);
531 if (ret < 0) {
532 av_freep(&avctx->priv_data);
533 return ret;
534 }
535 return 0;
536 }
537
538 int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size,
539 const short *samples)
540 {
541 if(buf_size < FF_MIN_BUFFER_SIZE && 0){
542 av_log(avctx, AV_LOG_ERROR, "buffer smaller then minimum size\n");
543 return -1;
544 }
545 if((avctx->codec->capabilities & CODEC_CAP_DELAY) || samples){
546 int ret = avctx->codec->encode(avctx, buf, buf_size, (void *)samples);
547 avctx->frame_number++;
548 return ret;
549 }else
550 return 0;
551 }
552
553 int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
554 const AVFrame *pict)
555 {
556 if(buf_size < FF_MIN_BUFFER_SIZE){
557 av_log(avctx, AV_LOG_ERROR, "buffer smaller then minimum size\n");
558 return -1;
559 }
560 if(avcodec_check_dimensions(avctx,avctx->width,avctx->height))
561 return -1;
562 if((avctx->codec->capabilities & CODEC_CAP_DELAY) || pict){
563 int ret = avctx->codec->encode(avctx, buf, buf_size, (void *)pict);
564 avctx->frame_number++;
565 emms_c(); //needed to avoid a emms_c() call before every return;
566
567 return ret;
568 }else
569 return 0;
570 }
571
572 /**
573 * decode a frame.
574 * @param buf bitstream buffer, must be FF_INPUT_BUFFER_PADDING_SIZE larger then the actual read bytes
575 * because some optimized bitstream readers read 32 or 64 bit at once and could read over the end
576 * @param buf_size the size of the buffer in bytes
577 * @param got_picture_ptr zero if no frame could be decompressed, Otherwise, it is non zero
578 * @return -1 if error, otherwise return the number of
579 * bytes used.
580 */
581 int avcodec_decode_video(AVCodecContext *avctx, AVFrame *picture,
582 int *got_picture_ptr,
583 uint8_t *buf, int buf_size)
584 {
585 int ret;
586
587 *got_picture_ptr= 0;
588 if((avctx->coded_width||avctx->coded_height) && avcodec_check_dimensions(avctx,avctx->coded_width,avctx->coded_height))
589 return -1;
590 ret = avctx->codec->decode(avctx, picture, got_picture_ptr,
591 buf, buf_size);
592
593 emms_c(); //needed to avoid a emms_c() call before every return;
594
595 if (*got_picture_ptr)
596 avctx->frame_number++;
597 return ret;
598 }
599
600 /* decode an audio frame. return -1 if error, otherwise return the
601 *number of bytes used. If no frame could be decompressed,
602 *frame_size_ptr is zero. Otherwise, it is the decompressed frame
603 *size in BYTES. */
604 int avcodec_decode_audio(AVCodecContext *avctx, int16_t *samples,
605 int *frame_size_ptr,
606 uint8_t *buf, int buf_size)
607 {
608 int ret;
609
610 *frame_size_ptr= 0;
611 ret = avctx->codec->decode(avctx, samples, frame_size_ptr,
612 buf, buf_size);
613 avctx->frame_number++;
614 return ret;
615 }
616
617 int avcodec_close(AVCodecContext *avctx)
618 {
619 if (avctx->codec->close)
620 avctx->codec->close(avctx);
621 avcodec_default_free_buffers(avctx);
622 av_freep(&avctx->priv_data);
623 avctx->codec = NULL;
624 return 0;
625 }
626
627 AVCodec *avcodec_find_encoder(enum CodecID id)
628 {
629 AVCodec *p;
630 p = first_avcodec;
631 while (p) {
632 if (p->encode != NULL && p->id == id)
633 return p;
634 p = p->next;
635 }
636 return NULL;
637 }
638
639 AVCodec *avcodec_find_encoder_by_name(const char *name)
640 {
641 AVCodec *p;
642 p = first_avcodec;
643 while (p) {
644 if (p->encode != NULL && strcmp(name,p->name) == 0)
645 return p;
646 p = p->next;
647 }
648 return NULL;
649 }
650
651 AVCodec *avcodec_find_decoder(enum CodecID id)
652 {
653 AVCodec *p;
654 p = first_avcodec;
655 while (p) {
656 if (p->decode != NULL && p->id == id)
657 return p;
658 p = p->next;
659 }
660 return NULL;
661 }
662
663 AVCodec *avcodec_find_decoder_by_name(const char *name)
664 {
665 AVCodec *p;
666 p = first_avcodec;
667 while (p) {
668 if (p->decode != NULL && strcmp(name,p->name) == 0)
669 return p;
670 p = p->next;
671 }
672 return NULL;
673 }
674
675 static AVCodec *avcodec_find(enum CodecID id)
676 {
677 AVCodec *p;
678 p = first_avcodec;
679 while (p) {
680 if (p->id == id)
681 return p;
682 p = p->next;
683 }
684 return NULL;
685 }
686
687 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)
688 {
689 const char *codec_name;
690 AVCodec *p;
691 char buf1[32];
692 char channels_str[100];
693 int bitrate;
694
695 if (encode)
696 p = avcodec_find_encoder(enc->codec_id);
697 else
698 p = avcodec_find_decoder(enc->codec_id);
699
700 if (p) {
701 codec_name = p->name;
702 if (!encode && enc->codec_id == CODEC_ID_MP3) {
703 if (enc->sub_id == 2)
704 codec_name = "mp2";
705 else if (enc->sub_id == 1)
706 codec_name = "mp1";
707 }
708 } else if (enc->codec_id == CODEC_ID_MPEG2TS) {
709 /* fake mpeg2 transport stream codec (currently not
710 registered) */
711 codec_name = "mpeg2ts";
712 } else if (enc->codec_name[0] != '\0') {
713 codec_name = enc->codec_name;
714 } else {
715 /* output avi tags */
716 if (enc->codec_type == CODEC_TYPE_VIDEO) {
717 snprintf(buf1, sizeof(buf1), "%c%c%c%c",
718 enc->codec_tag & 0xff,
719 (enc->codec_tag >> 8) & 0xff,
720 (enc->codec_tag >> 16) & 0xff,
721 (enc->codec_tag >> 24) & 0xff);
722 } else {
723 snprintf(buf1, sizeof(buf1), "0x%04x", enc->codec_tag);
724 }
725 codec_name = buf1;
726 }
727
728 switch(enc->codec_type) {
729 case CODEC_TYPE_VIDEO:
730 snprintf(buf, buf_size,
731 "Video: %s%s",
732 codec_name, enc->mb_decision ? " (hq)" : "");
733 if (enc->codec_id == CODEC_ID_RAWVIDEO) {
734 snprintf(buf + strlen(buf), buf_size - strlen(buf),
735 ", %s",
736 avcodec_get_pix_fmt_name(enc->pix_fmt));
737 }
738 if (enc->width) {
739 snprintf(buf + strlen(buf), buf_size - strlen(buf),
740 ", %dx%d, %0.2f fps",
741 enc->width, enc->height,
742 (float)enc->frame_rate / enc->frame_rate_base);
743 }
744 if (encode) {
745 snprintf(buf + strlen(buf), buf_size - strlen(buf),
746 ", q=%d-%d", enc->qmin, enc->qmax);
747 }
748 bitrate = enc->bit_rate;
749 break;
750 case CODEC_TYPE_AUDIO:
751 snprintf(buf, buf_size,
752 "Audio: %s",
753 codec_name);
754 switch (enc->channels) {
755 case 1:
756 strcpy(channels_str, "mono");
757 break;
758 case 2:
759 strcpy(channels_str, "stereo");
760 break;
761 case 6:
762 strcpy(channels_str, "5:1");
763 break;
764 default:
765 sprintf(channels_str, "%d channels", enc->channels);
766 break;
767 }
768 if (enc->sample_rate) {
769 snprintf(buf + strlen(buf), buf_size - strlen(buf),
770 ", %d Hz, %s",
771 enc->sample_rate,
772 channels_str);
773 }
774
775 /* for PCM codecs, compute bitrate directly */
776 switch(enc->codec_id) {
777 case CODEC_ID_PCM_S16LE:
778 case CODEC_ID_PCM_S16BE:
779 case CODEC_ID_PCM_U16LE:
780 case CODEC_ID_PCM_U16BE:
781 bitrate = enc->sample_rate * enc->channels * 16;
782 break;
783 case CODEC_ID_PCM_S8:
784 case CODEC_ID_PCM_U8:
785 case CODEC_ID_PCM_ALAW:
786 case CODEC_ID_PCM_MULAW:
787 bitrate = enc->sample_rate * enc->channels * 8;
788 break;
789 default:
790 bitrate = enc->bit_rate;
791 break;
792 }
793 break;
794 case CODEC_TYPE_DATA:
795 snprintf(buf, buf_size, "Data: %s", codec_name);
796 bitrate = enc->bit_rate;
797 break;
798 default:
799 snprintf(buf, buf_size, "Invalid Codec type %d", enc->codec_type);
800 return;
801 }
802 if (encode) {
803 if (enc->flags & CODEC_FLAG_PASS1)
804 snprintf(buf + strlen(buf), buf_size - strlen(buf),
805 ", pass 1");
806 if (enc->flags & CODEC_FLAG_PASS2)
807 snprintf(buf + strlen(buf), buf_size - strlen(buf),
808 ", pass 2");
809 }
810 if (bitrate != 0) {
811 snprintf(buf + strlen(buf), buf_size - strlen(buf),
812 ", %d kb/s", bitrate / 1000);
813 }
814 }
815
816 unsigned avcodec_version( void )
817 {
818 return LIBAVCODEC_VERSION_INT;
819 }
820
821 unsigned avcodec_build( void )
822 {
823 return LIBAVCODEC_BUILD;
824 }
825
826 /* must be called before any other functions */
827 void avcodec_init(void)
828 {
829 static int inited = 0;
830
831 if (inited != 0)
832 return;
833 inited = 1;
834
835 dsputil_static_init();
836 }
837
838 /**
839 * Flush buffers, should be called when seeking or when swicthing to a different stream.
840 */
841 void avcodec_flush_buffers(AVCodecContext *avctx)
842 {
843 if(avctx->codec->flush)
844 avctx->codec->flush(avctx);
845 }
846
847 void avcodec_default_free_buffers(AVCodecContext *s){
848 int i, j;
849
850 if(s->internal_buffer==NULL) return;
851
852 for(i=0; i<INTERNAL_BUFFER_SIZE; i++){
853 InternalBuffer *buf= &((InternalBuffer*)s->internal_buffer)[i];
854 for(j=0; j<4; j++){
855 av_freep(&buf->base[j]);
856 buf->data[j]= NULL;
857 }
858 }
859 av_freep(&s->internal_buffer);
860
861 s->internal_buffer_count=0;
862 }
863
864 char av_get_pict_type_char(int pict_type){
865 switch(pict_type){
866 case I_TYPE: return 'I';
867 case P_TYPE: return 'P';
868 case B_TYPE: return 'B';
869 case S_TYPE: return 'S';
870 case SI_TYPE:return 'i';
871 case SP_TYPE:return 'p';
872 default: return '?';
873 }
874 }
875
876 int av_reduce(int *dst_nom, int *dst_den, int64_t nom, int64_t den, int64_t max){
877 AVRational a0={0,1}, a1={1,0};
878 int sign= (nom<0) ^ (den<0);
879 int64_t gcd= ff_gcd(ABS(nom), ABS(den));
880
881 nom = ABS(nom)/gcd;
882 den = ABS(den)/gcd;
883 if(nom<=max && den<=max){
884 a1= (AVRational){nom, den};
885 den=0;
886 }
887
888 while(den){
889 int64_t x = nom / den;
890 int64_t next_den= nom - den*x;
891 int64_t a2n= x*a1.num + a0.num;
892 int64_t a2d= x*a1.den + a0.den;
893
894 if(a2n > max || a2d > max) break;
895
896 a0= a1;
897 a1= (AVRational){a2n, a2d};
898 nom= den;
899 den= next_den;
900 }
901 assert(ff_gcd(a1.num, a1.den) == 1);
902
903 *dst_nom = sign ? -a1.num : a1.num;
904 *dst_den = a1.den;
905
906 return den==0;
907 }
908
909 int64_t av_rescale_rnd(int64_t a, int64_t b, int64_t c, enum AVRounding rnd){
910 AVInteger ai;
911 int64_t r=0;
912 assert(c > 0);
913 assert(b >=0);
914 assert(rnd >=0 && rnd<=5 && rnd!=4);
915
916 if(a<0 && a != INT64_MIN) return -av_rescale_rnd(-a, b, c, rnd ^ ((rnd>>1)&1));
917
918 if(rnd==AV_ROUND_NEAR_INF) r= c/2;
919 else if(rnd&1) r= c-1;
920
921 if(b<=INT_MAX && c<=INT_MAX){
922 if(a<=INT_MAX)
923 return (a * b + r)/c;
924 else
925 return a/c*b + (a%c*b + r)/c;
926 }
927
928 ai= av_mul_i(av_int2i(a), av_int2i(b));
929 ai= av_add_i(ai, av_int2i(r));
930
931 return av_i2int(av_div_i(ai, av_int2i(c)));
932 }
933
934 int64_t av_rescale(int64_t a, int64_t b, int64_t c){
935 return av_rescale_rnd(a, b, c, AV_ROUND_NEAR_INF);
936 }
937
938 int64_t ff_gcd(int64_t a, int64_t b){
939 if(b) return ff_gcd(b, a%b);
940 else return a;
941 }
942
943 /* av_log API */
944
945 static int av_log_level = AV_LOG_DEBUG;
946
947 static void av_log_default_callback(void* ptr, int level, const char* fmt, va_list vl)
948 {
949 static int print_prefix=1;
950 AVClass* avc= ptr ? *(AVClass**)ptr : NULL;
951 if(level>av_log_level)
952 return;
953 #undef fprintf
954 if(print_prefix && avc) {
955 fprintf(stderr, "[%s @ %p]", avc->item_name(ptr), avc);
956 }
957 #define fprintf please_use_av_log
958
959 print_prefix= strstr(fmt, "\n") != NULL;
960
961 vfprintf(stderr, fmt, vl);
962 }
963
964 static void (*av_log_callback)(void*, int, const char*, va_list) = av_log_default_callback;
965
966 void av_log(void* avcl, int level, const char *fmt, ...)
967 {
968 va_list vl;
969 va_start(vl, fmt);
970 av_vlog(avcl, level, fmt, vl);
971 va_end(vl);
972 }
973
974 void av_vlog(void* avcl, int level, const char *fmt, va_list vl)
975 {
976 av_log_callback(avcl, level, fmt, vl);
977 }
978
979 int av_log_get_level(void)
980 {
981 return av_log_level;
982 }
983
984 void av_log_set_level(int level)
985 {
986 av_log_level = level;
987 }
988
989 void av_log_set_callback(void (*callback)(void*, int, const char*, va_list))
990 {
991 av_log_callback = callback;
992 }
993
994 #if !defined(HAVE_THREADS)
995 int avcodec_thread_init(AVCodecContext *s, int thread_count){
996 return -1;
997 }
998 #endif