16x8 MV vissualization by (Wolfgang Hesseler <qv at multimediaware dot com>)
[libav.git] / libavcodec / utils.c
CommitLineData
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1/*
2 * utils for libavcodec
ff4ec49e 3 * Copyright (c) 2001 Fabrice Bellard.
9b879566 4 * Copyright (c) 2003 Michel Bardiaux for the av_log API
de6d9b64 5 *
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6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
de6d9b64 10 *
ff4ec49e 11 * This library is distributed in the hope that it will be useful,
de6d9b64 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
de6d9b64 15 *
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16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
de6d9b64 19 */
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20
21/**
22 * @file utils.c
23 * utils.
24 */
25
de6d9b64 26#include "avcodec.h"
3123dd79 27#include "dsputil.h"
1c2a8c7f 28#include "mpegvideo.h"
9b879566 29#include <stdarg.h>
de6d9b64 30
18f77016 31void *av_mallocz(unsigned int size)
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32{
33 void *ptr;
5b20b732 34
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35 ptr = av_malloc(size);
36 if (!ptr)
37 return NULL;
38 memset(ptr, 0, size);
39 return ptr;
40}
41
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42char *av_strdup(const char *s)
43{
44 char *ptr;
45 int len;
46 len = strlen(s) + 1;
47 ptr = av_malloc(len);
48 if (!ptr)
49 return NULL;
50 memcpy(ptr, s, len);
51 return ptr;
52}
53
54/**
55 * realloc which does nothing if the block is large enough
56 */
5c91a675 57void *av_fast_realloc(void *ptr, unsigned int *size, unsigned int min_size)
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58{
59 if(min_size < *size)
60 return ptr;
61
62 *size= min_size + 10*1024;
63
64 return av_realloc(ptr, *size);
65}
66
67
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68/* allocation of static arrays - do not use for normal allocation */
69static unsigned int last_static = 0;
70static char*** array_static = NULL;
71static const unsigned int grow_static = 64; // ^2
72void *__av_mallocz_static(void** location, unsigned int size)
73{
5c91a675 74 unsigned int l = (last_static + grow_static) & ~(grow_static - 1);
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75 void *ptr = av_mallocz(size);
76 if (!ptr)
77 return NULL;
78
79 if (location)
80 {
81 if (l > last_static)
8e1e6f31 82 array_static = av_realloc(array_static, l);
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83 array_static[last_static++] = (char**) location;
84 *location = ptr;
85 }
86 return ptr;
87}
88/* free all static arrays and reset pointers to 0 */
4cfbf61b 89void av_free_static(void)
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90{
91 if (array_static)
92 {
93 unsigned i;
94 for (i = 0; i < last_static; i++)
95 {
8e1e6f31 96 av_free(*array_static[i]);
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97 *array_static[i] = NULL;
98 }
8e1e6f31 99 av_free(array_static);
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100 array_static = 0;
101 }
102 last_static = 0;
103}
104
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105/* cannot call it directly because of 'void **' casting is not automatic */
106void __av_freep(void **ptr)
107{
108 av_free(*ptr);
109 *ptr = NULL;
110}
111
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112/* encoder management */
113AVCodec *first_avcodec;
114
115void register_avcodec(AVCodec *format)
116{
117 AVCodec **p;
118 p = &first_avcodec;
119 while (*p != NULL) p = &(*p)->next;
120 *p = format;
121 format->next = NULL;
122}
123
d90cf87b 124typedef struct InternalBuffer{
1e491e29 125 int last_pic_num;
d90cf87b 126 uint8_t *base[4];
1e491e29 127 uint8_t *data[4];
237e4938 128 int linesize[4];
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129}InternalBuffer;
130
131#define INTERNAL_BUFFER_SIZE 32
1e491e29 132
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133#define ALIGN(x, a) (((x)+(a)-1)&~((a)-1))
134
135void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height){
136 int w_align= 1;
137 int h_align= 1;
138
139 switch(s->pix_fmt){
140 case PIX_FMT_YUV420P:
141 case PIX_FMT_YUV422:
142 case PIX_FMT_YUV422P:
143 case PIX_FMT_YUV444P:
144 case PIX_FMT_GRAY8:
145 case PIX_FMT_YUVJ420P:
146 case PIX_FMT_YUVJ422P:
147 case PIX_FMT_YUVJ444P:
148 w_align= 16; //FIXME check for non mpeg style codecs and use less alignment
149 h_align= 16;
150 break;
151 case PIX_FMT_YUV411P:
152 w_align=32;
153 h_align=8;
154 break;
155 case PIX_FMT_YUV410P:
156 if(s->codec_id == CODEC_ID_SVQ1){
157 w_align=64;
158 h_align=64;
159 }
160 break;
161 default:
162 w_align= 1;
163 h_align= 1;
164 break;
165 }
166
167 *width = ALIGN(*width , w_align);
168 *height= ALIGN(*height, h_align);
169}
170
492cd3a9 171int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic){
1e491e29 172 int i;
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173 int w= s->width;
174 int h= s->height;
d90cf87b 175 InternalBuffer *buf;
237e4938 176 int *picture_number;
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177
178 assert(pic->data[0]==NULL);
d90cf87b 179 assert(INTERNAL_BUFFER_SIZE > s->internal_buffer_count);
1e491e29 180
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181 if(s->internal_buffer==NULL){
182 s->internal_buffer= av_mallocz(INTERNAL_BUFFER_SIZE*sizeof(InternalBuffer));
183 }
184#if 0
185 s->internal_buffer= av_fast_realloc(
186 s->internal_buffer,
187 &s->internal_buffer_size,
188 sizeof(InternalBuffer)*FFMAX(99, s->internal_buffer_count+1)/*FIXME*/
189 );
190#endif
191
192 buf= &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
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193 picture_number= &(((InternalBuffer*)s->internal_buffer)[INTERNAL_BUFFER_SIZE-1]).last_pic_num; //FIXME ugly hack
194 (*picture_number)++;
195
d90cf87b 196 if(buf->base[0]){
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197 pic->age= *picture_number - buf->last_pic_num;
198 buf->last_pic_num= *picture_number;
1e491e29 199 }else{
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200 int h_chroma_shift, v_chroma_shift;
201 int s_align, pixel_size;
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202
203 avcodec_get_chroma_sub_sample(s->pix_fmt, &h_chroma_shift, &v_chroma_shift);
f0bbfc4a 204
1e491e29 205 switch(s->pix_fmt){
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206 case PIX_FMT_RGB555:
207 case PIX_FMT_RGB565:
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208 case PIX_FMT_YUV422:
209 pixel_size=2;
210 break;
211 case PIX_FMT_RGB24:
212 case PIX_FMT_BGR24:
213 pixel_size=3;
214 break;
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215 case PIX_FMT_RGBA32:
216 pixel_size=4;
217 break;
218 default:
219 pixel_size=1;
220 }
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221
222 avcodec_align_dimensions(s, &w, &h);
223#if defined(ARCH_POWERPC) || defined(HAVE_MMI) //FIXME some cleaner check
224 s_align= 16;
225#else
226 s_align= 8;
227#endif
228
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229 if(!(s->flags&CODEC_FLAG_EMU_EDGE)){
230 w+= EDGE_WIDTH*2;
231 h+= EDGE_WIDTH*2;
232 }
233
d90cf87b 234 buf->last_pic_num= -256*256*256*64;
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235
236 for(i=0; i<3; i++){
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237 const int h_shift= i==0 ? 0 : h_chroma_shift;
238 const int v_shift= i==0 ? 0 : v_chroma_shift;
1e491e29 239
237e4938 240 buf->linesize[i]= ALIGN(pixel_size*w>>h_shift, s_align);
1e491e29 241
237e4938 242 buf->base[i]= av_mallocz((buf->linesize[i]*h>>v_shift)+16); //FIXME 16
d90cf87b 243 if(buf->base[i]==NULL) return -1;
237e4938 244 memset(buf->base[i], 128, buf->linesize[i]*h>>v_shift);
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245
246 if(s->flags&CODEC_FLAG_EMU_EDGE)
d90cf87b 247 buf->data[i] = buf->base[i];
1e491e29 248 else
237e4938 249 buf->data[i] = buf->base[i] + ALIGN((buf->linesize[i]*EDGE_WIDTH>>v_shift) + (EDGE_WIDTH>>h_shift), s_align);
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250 }
251 pic->age= 256*256*256*64;
252 }
237e4938 253 pic->type= FF_BUFFER_TYPE_INTERNAL;
1e491e29 254
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255 for(i=0; i<4; i++){
256 pic->base[i]= buf->base[i];
257 pic->data[i]= buf->data[i];
237e4938 258 pic->linesize[i]= buf->linesize[i];
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259 }
260 s->internal_buffer_count++;
261
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262 return 0;
263}
264
492cd3a9 265void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic){
1e491e29 266 int i;
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267 InternalBuffer *buf, *last, temp;
268
4e00e76b 269 assert(pic->type==FF_BUFFER_TYPE_INTERNAL);
59c673d5 270 assert(s->internal_buffer_count);
d90cf87b 271
b1609412 272 buf = NULL; /* avoids warning */
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273 for(i=0; i<s->internal_buffer_count; i++){ //just 3-5 checks so is not worth to optimize
274 buf= &((InternalBuffer*)s->internal_buffer)[i];
275 if(buf->data[0] == pic->data[0])
276 break;
277 }
278 assert(i < s->internal_buffer_count);
279 s->internal_buffer_count--;
280 last = &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
281
282 temp= *buf;
283 *buf= *last;
284 *last= temp;
285
286 for(i=0; i<3; i++){
1e491e29 287 pic->data[i]=NULL;
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288// pic->base[i]=NULL;
289 }
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290//printf("R%X\n", pic->opaque);
291}
292
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293enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, enum PixelFormat * fmt){
294 return fmt[0];
295}
296
a949d72e 297void avcodec_get_context_defaults(AVCodecContext *s){
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298 s->bit_rate= 800*1000;
299 s->bit_rate_tolerance= s->bit_rate*10;
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300 s->qmin= 2;
301 s->qmax= 31;
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302 s->mb_qmin= 2;
303 s->mb_qmax= 31;
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304 s->rc_eq= "tex^qComp";
305 s->qcompress= 0.5;
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306 s->max_qdiff= 3;
307 s->b_quant_factor=1.25;
308 s->b_quant_offset=1.25;
b3a391e8 309 s->i_quant_factor=-0.8;
e8b62df6 310 s->i_quant_offset=0.0;
4d2858de 311 s->error_concealment= 3;
8d0e42ca 312 s->error_resilience= 1;
4d2858de 313 s->workaround_bugs= FF_BUG_AUTODETECT;
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314 s->frame_rate_base= 1;
315 s->frame_rate = 25;
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316 s->gop_size= 50;
317 s->me_method= ME_EPZS;
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318 s->get_buffer= avcodec_default_get_buffer;
319 s->release_buffer= avcodec_default_release_buffer;
a33c7159 320 s->get_format= avcodec_default_get_format;
826f429a 321 s->me_subpel_quality=8;
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322 s->lmin= FF_QP2LAMBDA * s->qmin;
323 s->lmax= FF_QP2LAMBDA * s->qmax;
5ff85f1d 324 s->sample_aspect_ratio= (AVRational){0,1};
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325
326 s->intra_quant_bias= FF_DEFAULT_QUANT_BIAS;
327 s->inter_quant_bias= FF_DEFAULT_QUANT_BIAS;
2a2bbcb0 328 s->palctrl = NULL;
074c4ca7 329 s->cr_available = 0;
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330}
331
332/**
333 * allocates a AVCodecContext and set it to defaults.
334 * this can be deallocated by simply calling free()
335 */
7ffbb60e 336AVCodecContext *avcodec_alloc_context(void){
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337 AVCodecContext *avctx= av_mallocz(sizeof(AVCodecContext));
338
339 if(avctx==NULL) return NULL;
340
341 avcodec_get_context_defaults(avctx);
342
343 return avctx;
344}
345
1e491e29 346/**
492cd3a9 347 * allocates a AVPFrame and set it to defaults.
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348 * this can be deallocated by simply calling free()
349 */
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350AVFrame *avcodec_alloc_frame(void){
351 AVFrame *pic= av_mallocz(sizeof(AVFrame));
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352
353 return pic;
354}
355
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356int avcodec_open(AVCodecContext *avctx, AVCodec *codec)
357{
358 int ret;
359
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360 if(avctx->codec)
361 return -1;
362
de6d9b64 363 avctx->codec = codec;
4cb3ca72 364 avctx->codec_id = codec->id;
de6d9b64 365 avctx->frame_number = 0;
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366 if (codec->priv_data_size > 0) {
367 avctx->priv_data = av_mallocz(codec->priv_data_size);
368 if (!avctx->priv_data)
369 return -ENOMEM;
370 } else {
371 avctx->priv_data = NULL;
372 }
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373 ret = avctx->codec->init(avctx);
374 if (ret < 0) {
3123dd79 375 av_freep(&avctx->priv_data);
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376 return ret;
377 }
378 return 0;
379}
380
0c1a9eda 381int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size,
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382 const short *samples)
383{
384 int ret;
385
386 ret = avctx->codec->encode(avctx, buf, buf_size, (void *)samples);
387 avctx->frame_number++;
388 return ret;
389}
390
0c1a9eda 391int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
492cd3a9 392 const AVFrame *pict)
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393{
394 int ret;
395
396 ret = avctx->codec->encode(avctx, buf, buf_size, (void *)pict);
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397
398 emms_c(); //needed to avoid a emms_c() call before every return;
399
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400 avctx->frame_number++;
401 return ret;
402}
403
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404/**
405 * decode a frame.
406 * @param buf bitstream buffer, must be FF_INPUT_BUFFER_PADDING_SIZE larger then the actual read bytes
407 * because some optimized bitstream readers read 32 or 64 bit at once and could read over the end
408 * @param buf_size the size of the buffer in bytes
409 * @param got_picture_ptr zero if no frame could be decompressed, Otherwise, it is non zero
410 * @return -1 if error, otherwise return the number of
411 * bytes used.
412 */
492cd3a9 413int avcodec_decode_video(AVCodecContext *avctx, AVFrame *picture,
de6d9b64 414 int *got_picture_ptr,
0c1a9eda 415 uint8_t *buf, int buf_size)
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416{
417 int ret;
1e491e29 418
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419 ret = avctx->codec->decode(avctx, picture, got_picture_ptr,
420 buf, buf_size);
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421
422 emms_c(); //needed to avoid a emms_c() call before every return;
1e491e29 423
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424 if (*got_picture_ptr)
425 avctx->frame_number++;
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426 return ret;
427}
428
429/* decode an audio frame. return -1 if error, otherwise return the
430 *number of bytes used. If no frame could be decompressed,
431 *frame_size_ptr is zero. Otherwise, it is the decompressed frame
432 *size in BYTES. */
0c1a9eda 433int avcodec_decode_audio(AVCodecContext *avctx, int16_t *samples,
de6d9b64 434 int *frame_size_ptr,
0c1a9eda 435 uint8_t *buf, int buf_size)
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436{
437 int ret;
438
439 ret = avctx->codec->decode(avctx, samples, frame_size_ptr,
440 buf, buf_size);
441 avctx->frame_number++;
442 return ret;
443}
444
445int avcodec_close(AVCodecContext *avctx)
446{
447 if (avctx->codec->close)
448 avctx->codec->close(avctx);
3123dd79 449 av_freep(&avctx->priv_data);
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450 avctx->codec = NULL;
451 return 0;
452}
453
454AVCodec *avcodec_find_encoder(enum CodecID id)
455{
456 AVCodec *p;
457 p = first_avcodec;
458 while (p) {
459 if (p->encode != NULL && p->id == id)
460 return p;
461 p = p->next;
462 }
463 return NULL;
464}
465
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466AVCodec *avcodec_find_encoder_by_name(const char *name)
467{
468 AVCodec *p;
469 p = first_avcodec;
470 while (p) {
471 if (p->encode != NULL && strcmp(name,p->name) == 0)
472 return p;
473 p = p->next;
474 }
475 return NULL;
476}
477
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478AVCodec *avcodec_find_decoder(enum CodecID id)
479{
480 AVCodec *p;
481 p = first_avcodec;
482 while (p) {
483 if (p->decode != NULL && p->id == id)
484 return p;
485 p = p->next;
486 }
487 return NULL;
488}
489
490AVCodec *avcodec_find_decoder_by_name(const char *name)
491{
492 AVCodec *p;
493 p = first_avcodec;
494 while (p) {
495 if (p->decode != NULL && strcmp(name,p->name) == 0)
496 return p;
497 p = p->next;
498 }
499 return NULL;
500}
501
502AVCodec *avcodec_find(enum CodecID id)
503{
504 AVCodec *p;
505 p = first_avcodec;
506 while (p) {
507 if (p->id == id)
508 return p;
509 p = p->next;
510 }
511 return NULL;
512}
513
514void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)
515{
516 const char *codec_name;
517 AVCodec *p;
518 char buf1[32];
623563c0 519 char channels_str[100];
a96b68b7 520 int bitrate;
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521
522 if (encode)
523 p = avcodec_find_encoder(enc->codec_id);
524 else
525 p = avcodec_find_decoder(enc->codec_id);
526
527 if (p) {
528 codec_name = p->name;
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529 if (!encode && enc->codec_id == CODEC_ID_MP3) {
530 if (enc->sub_id == 2)
531 codec_name = "mp2";
532 else if (enc->sub_id == 1)
533 codec_name = "mp1";
534 }
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535 } else if (enc->codec_id == CODEC_ID_MPEG2TS) {
536 /* fake mpeg2 transport stream codec (currently not
537 registered) */
538 codec_name = "mpeg2ts";
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539 } else if (enc->codec_name[0] != '\0') {
540 codec_name = enc->codec_name;
541 } else {
542 /* output avi tags */
543 if (enc->codec_type == CODEC_TYPE_VIDEO) {
544 snprintf(buf1, sizeof(buf1), "%c%c%c%c",
545 enc->codec_tag & 0xff,
546 (enc->codec_tag >> 8) & 0xff,
547 (enc->codec_tag >> 16) & 0xff,
548 (enc->codec_tag >> 24) & 0xff);
549 } else {
550 snprintf(buf1, sizeof(buf1), "0x%04x", enc->codec_tag);
551 }
552 codec_name = buf1;
553 }
554
555 switch(enc->codec_type) {
556 case CODEC_TYPE_VIDEO:
557 snprintf(buf, buf_size,
558 "Video: %s%s",
7d1c3fc1 559 codec_name, enc->mb_decision ? " (hq)" : "");
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560 if (enc->codec_id == CODEC_ID_RAWVIDEO) {
561 snprintf(buf + strlen(buf), buf_size - strlen(buf),
562 ", %s",
9bbffbb1 563 avcodec_get_pix_fmt_name(enc->pix_fmt));
cf087595 564 }
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565 if (enc->width) {
566 snprintf(buf + strlen(buf), buf_size - strlen(buf),
567 ", %dx%d, %0.2f fps",
568 enc->width, enc->height,
14bea432 569 (float)enc->frame_rate / enc->frame_rate_base);
de6d9b64 570 }
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571 if (encode) {
572 snprintf(buf + strlen(buf), buf_size - strlen(buf),
573 ", q=%d-%d", enc->qmin, enc->qmax);
574 }
a96b68b7 575 bitrate = enc->bit_rate;
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576 break;
577 case CODEC_TYPE_AUDIO:
578 snprintf(buf, buf_size,
579 "Audio: %s",
580 codec_name);
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581 switch (enc->channels) {
582 case 1:
623563c0 583 strcpy(channels_str, "mono");
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584 break;
585 case 2:
623563c0 586 strcpy(channels_str, "stereo");
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587 break;
588 case 6:
623563c0 589 strcpy(channels_str, "5:1");
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590 break;
591 default:
592 sprintf(channels_str, "%d channels", enc->channels);
593 break;
594 }
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595 if (enc->sample_rate) {
596 snprintf(buf + strlen(buf), buf_size - strlen(buf),
597 ", %d Hz, %s",
598 enc->sample_rate,
e0d2714a 599 channels_str);
de6d9b64 600 }
e0d2714a 601
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602 /* for PCM codecs, compute bitrate directly */
603 switch(enc->codec_id) {
604 case CODEC_ID_PCM_S16LE:
605 case CODEC_ID_PCM_S16BE:
606 case CODEC_ID_PCM_U16LE:
607 case CODEC_ID_PCM_U16BE:
a190b7e9 608 bitrate = enc->sample_rate * enc->channels * 16;
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609 break;
610 case CODEC_ID_PCM_S8:
611 case CODEC_ID_PCM_U8:
612 case CODEC_ID_PCM_ALAW:
613 case CODEC_ID_PCM_MULAW:
a190b7e9 614 bitrate = enc->sample_rate * enc->channels * 8;
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615 break;
616 default:
617 bitrate = enc->bit_rate;
618 break;
619 }
de6d9b64 620 break;
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621 case CODEC_TYPE_DATA:
622 snprintf(buf, buf_size, "Data: %s", codec_name);
623 bitrate = enc->bit_rate;
624 break;
de6d9b64 625 default:
b71472eb 626 av_abort();
de6d9b64 627 }
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628 if (encode) {
629 if (enc->flags & CODEC_FLAG_PASS1)
630 snprintf(buf + strlen(buf), buf_size - strlen(buf),
631 ", pass 1");
632 if (enc->flags & CODEC_FLAG_PASS2)
633 snprintf(buf + strlen(buf), buf_size - strlen(buf),
634 ", pass 2");
635 }
a96b68b7 636 if (bitrate != 0) {
de6d9b64 637 snprintf(buf + strlen(buf), buf_size - strlen(buf),
a96b68b7 638 ", %d kb/s", bitrate / 1000);
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639 }
640}
641
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642unsigned avcodec_version( void )
643{
644 return LIBAVCODEC_VERSION_INT;
645}
cf087595 646
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647unsigned avcodec_build( void )
648{
649 return LIBAVCODEC_BUILD;
650}
651
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652/* must be called before any other functions */
653void avcodec_init(void)
654{
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655 static int inited = 0;
656
657 if (inited != 0)
658 return;
659 inited = 1;
660
59cf08ce 661 dsputil_static_init();
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662}
663
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664/**
665 * Flush buffers, should be called when seeking or when swicthing to a different stream.
666 */
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667void avcodec_flush_buffers(AVCodecContext *avctx)
668{
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669 if(avctx->codec->flush)
670 avctx->codec->flush(avctx);
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671}
672
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673void avcodec_default_free_buffers(AVCodecContext *s){
674 int i, j;
675
676 if(s->internal_buffer==NULL) return;
677
678 for(i=0; i<INTERNAL_BUFFER_SIZE; i++){
679 InternalBuffer *buf= &((InternalBuffer*)s->internal_buffer)[i];
680 for(j=0; j<4; j++){
681 av_freep(&buf->base[j]);
682 buf->data[j]= NULL;
683 }
684 }
685 av_freep(&s->internal_buffer);
686
687 s->internal_buffer_count=0;
688}
689
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690char av_get_pict_type_char(int pict_type){
691 switch(pict_type){
692 case I_TYPE: return 'I';
693 case P_TYPE: return 'P';
694 case B_TYPE: return 'B';
695 case S_TYPE: return 'S';
696 case SI_TYPE:return 'i';
697 case SP_TYPE:return 'p';
698 default: return '?';
699 }
700}
701
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702int av_reduce(int *dst_nom, int *dst_den, int64_t nom, int64_t den, int64_t max){
703 int exact=1, sign=0;
5ed9f2e5 704 int64_t gcd;
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705
706 assert(den != 0);
707
708 if(den < 0){
709 den= -den;
710 nom= -nom;
711 }
712
713 if(nom < 0){
714 nom= -nom;
715 sign= 1;
716 }
717
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718 gcd = ff_gcd(nom, den);
719 nom /= gcd;
720 den /= gcd;
14bea432 721
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722 if(nom > max || den > max){
723 AVRational a0={0,1}, a1={1,0};
724 exact=0;
725
726 for(;;){
727 int64_t x= nom / den;
728 int64_t a2n= x*a1.num + a0.num;
729 int64_t a2d= x*a1.den + a0.den;
730
731 if(a2n > max || a2d > max) break;
732
733 nom %= den;
734
735 a0= a1;
736 a1= (AVRational){a2n, a2d};
737 if(nom==0) break;
738 x= nom; nom=den; den=x;
739 }
740 nom= a1.num;
741 den= a1.den;
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742 }
743
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744 assert(ff_gcd(nom, den) == 1);
745
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746 if(sign) nom= -nom;
747
748 *dst_nom = nom;
749 *dst_den = den;
750
751 return exact;
752}
753
754int64_t av_rescale(int64_t a, int b, int c){
755 uint64_t h, l;
756 assert(c > 0);
757 assert(b >=0);
758
759 if(a<0) return -av_rescale(-a, b, c);
760
761 h= a>>32;
762 if(h==0) return a*b/c;
763
764 l= a&0xFFFFFFFF;
765 l *= b;
766 h *= b;
767
768 l += (h%c)<<32;
769
770 return ((h/c)<<32) + l/c;
771}
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772
773/* av_log API */
774
775#ifdef AV_LOG_TRAP_PRINTF
776#undef stderr
777#undef fprintf
778#endif
779
780static int av_log_level = AV_LOG_DEBUG;
781
782static void av_log_default_callback(AVCodecContext* avctx, int level, const char* fmt, va_list vl)
783{
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784 static int print_prefix=1;
785
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786 if(level>av_log_level)
787 return;
89b9441a 788 if(avctx && print_prefix)
9b879566 789 fprintf(stderr, "[%s @ %p]", avctx->codec->name, avctx);
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790
791 print_prefix= (int)strstr(fmt, "\n");
792
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793 vfprintf(stderr, fmt, vl);
794}
795
796static void (*av_log_callback)(AVCodecContext*, int, const char*, va_list) = av_log_default_callback;
797
798void av_log(AVCodecContext* avctx, int level, const char *fmt, ...)
799{
800 va_list vl;
801 va_start(vl, fmt);
802 av_vlog(avctx, level, fmt, vl);
803 va_end(vl);
804}
805
806void av_vlog(AVCodecContext* avctx, int level, const char *fmt, va_list vl)
807{
808 av_log_callback(avctx, level, fmt, vl);
809}
810
811int av_log_get_level(void)
812{
813 return av_log_level;
814}
815
816void av_log_set_level(int level)
817{
818 av_log_level = level;
819}
820
821void av_log_set_callback(void (*callback)(AVCodecContext*, int, const char*, va_list))
822{
823 av_log_callback = callback;
824}
825