10l (forgot that the dstW offset is hardcoded in the asm)
[libav.git] / libavcodec / utils.c
CommitLineData
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1/*
2 * utils for libavcodec
ff4ec49e 3 * Copyright (c) 2001 Fabrice Bellard.
de6d9b64 4 *
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5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
de6d9b64 9 *
ff4ec49e 10 * This library is distributed in the hope that it will be useful,
de6d9b64 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
de6d9b64 14 *
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15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
de6d9b64 18 */
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19
20/**
21 * @file utils.c
22 * utils.
23 */
24
de6d9b64 25#include "avcodec.h"
3123dd79 26#include "dsputil.h"
1c2a8c7f 27#include "mpegvideo.h"
de6d9b64 28
18f77016 29void *av_mallocz(unsigned int size)
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30{
31 void *ptr;
5b20b732 32
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33 ptr = av_malloc(size);
34 if (!ptr)
35 return NULL;
36 memset(ptr, 0, size);
37 return ptr;
38}
39
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40char *av_strdup(const char *s)
41{
42 char *ptr;
43 int len;
44 len = strlen(s) + 1;
45 ptr = av_malloc(len);
46 if (!ptr)
47 return NULL;
48 memcpy(ptr, s, len);
49 return ptr;
50}
51
52/**
53 * realloc which does nothing if the block is large enough
54 */
5c91a675 55void *av_fast_realloc(void *ptr, unsigned int *size, unsigned int min_size)
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56{
57 if(min_size < *size)
58 return ptr;
59
60 *size= min_size + 10*1024;
61
62 return av_realloc(ptr, *size);
63}
64
65
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66/* allocation of static arrays - do not use for normal allocation */
67static unsigned int last_static = 0;
68static char*** array_static = NULL;
69static const unsigned int grow_static = 64; // ^2
70void *__av_mallocz_static(void** location, unsigned int size)
71{
5c91a675 72 unsigned int l = (last_static + grow_static) & ~(grow_static - 1);
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73 void *ptr = av_mallocz(size);
74 if (!ptr)
75 return NULL;
76
77 if (location)
78 {
79 if (l > last_static)
8e1e6f31 80 array_static = av_realloc(array_static, l);
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81 array_static[last_static++] = (char**) location;
82 *location = ptr;
83 }
84 return ptr;
85}
86/* free all static arrays and reset pointers to 0 */
4cfbf61b 87void av_free_static(void)
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88{
89 if (array_static)
90 {
91 unsigned i;
92 for (i = 0; i < last_static; i++)
93 {
8e1e6f31 94 av_free(*array_static[i]);
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95 *array_static[i] = NULL;
96 }
8e1e6f31 97 av_free(array_static);
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98 array_static = 0;
99 }
100 last_static = 0;
101}
102
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103/* cannot call it directly because of 'void **' casting is not automatic */
104void __av_freep(void **ptr)
105{
106 av_free(*ptr);
107 *ptr = NULL;
108}
109
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110/* encoder management */
111AVCodec *first_avcodec;
112
113void register_avcodec(AVCodec *format)
114{
115 AVCodec **p;
116 p = &first_avcodec;
117 while (*p != NULL) p = &(*p)->next;
118 *p = format;
119 format->next = NULL;
120}
121
d90cf87b 122typedef struct InternalBuffer{
1e491e29 123 int last_pic_num;
d90cf87b 124 uint8_t *base[4];
1e491e29 125 uint8_t *data[4];
237e4938 126 int linesize[4];
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127}InternalBuffer;
128
129#define INTERNAL_BUFFER_SIZE 32
1e491e29 130
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131#define ALIGN(x, a) (((x)+(a)-1)&~((a)-1))
132
133void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height){
134 int w_align= 1;
135 int h_align= 1;
136
137 switch(s->pix_fmt){
138 case PIX_FMT_YUV420P:
139 case PIX_FMT_YUV422:
140 case PIX_FMT_YUV422P:
141 case PIX_FMT_YUV444P:
142 case PIX_FMT_GRAY8:
143 case PIX_FMT_YUVJ420P:
144 case PIX_FMT_YUVJ422P:
145 case PIX_FMT_YUVJ444P:
146 w_align= 16; //FIXME check for non mpeg style codecs and use less alignment
147 h_align= 16;
148 break;
149 case PIX_FMT_YUV411P:
150 w_align=32;
151 h_align=8;
152 break;
153 case PIX_FMT_YUV410P:
154 if(s->codec_id == CODEC_ID_SVQ1){
155 w_align=64;
156 h_align=64;
157 }
158 break;
159 default:
160 w_align= 1;
161 h_align= 1;
162 break;
163 }
164
165 *width = ALIGN(*width , w_align);
166 *height= ALIGN(*height, h_align);
167}
168
492cd3a9 169int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic){
1e491e29 170 int i;
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171 int w= s->width;
172 int h= s->height;
d90cf87b 173 InternalBuffer *buf;
237e4938 174 int *picture_number;
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175
176 assert(pic->data[0]==NULL);
d90cf87b 177 assert(INTERNAL_BUFFER_SIZE > s->internal_buffer_count);
1e491e29 178
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179 if(s->internal_buffer==NULL){
180 s->internal_buffer= av_mallocz(INTERNAL_BUFFER_SIZE*sizeof(InternalBuffer));
181 }
182#if 0
183 s->internal_buffer= av_fast_realloc(
184 s->internal_buffer,
185 &s->internal_buffer_size,
186 sizeof(InternalBuffer)*FFMAX(99, s->internal_buffer_count+1)/*FIXME*/
187 );
188#endif
189
190 buf= &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
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191 picture_number= &(((InternalBuffer*)s->internal_buffer)[INTERNAL_BUFFER_SIZE-1]).last_pic_num; //FIXME ugly hack
192 (*picture_number)++;
193
d90cf87b 194 if(buf->base[0]){
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195 pic->age= *picture_number - buf->last_pic_num;
196 buf->last_pic_num= *picture_number;
1e491e29 197 }else{
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198 int h_chroma_shift, v_chroma_shift;
199 int s_align, pixel_size;
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200
201 avcodec_get_chroma_sub_sample(s->pix_fmt, &h_chroma_shift, &v_chroma_shift);
f0bbfc4a 202
1e491e29 203 switch(s->pix_fmt){
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204 case PIX_FMT_RGB555:
205 case PIX_FMT_RGB565:
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206 case PIX_FMT_YUV422:
207 pixel_size=2;
208 break;
209 case PIX_FMT_RGB24:
210 case PIX_FMT_BGR24:
211 pixel_size=3;
212 break;
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213 case PIX_FMT_RGBA32:
214 pixel_size=4;
215 break;
216 default:
217 pixel_size=1;
218 }
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219
220 avcodec_align_dimensions(s, &w, &h);
221#if defined(ARCH_POWERPC) || defined(HAVE_MMI) //FIXME some cleaner check
222 s_align= 16;
223#else
224 s_align= 8;
225#endif
226
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227 if(!(s->flags&CODEC_FLAG_EMU_EDGE)){
228 w+= EDGE_WIDTH*2;
229 h+= EDGE_WIDTH*2;
230 }
231
d90cf87b 232 buf->last_pic_num= -256*256*256*64;
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233
234 for(i=0; i<3; i++){
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235 const int h_shift= i==0 ? 0 : h_chroma_shift;
236 const int v_shift= i==0 ? 0 : v_chroma_shift;
1e491e29 237
237e4938 238 buf->linesize[i]= ALIGN(pixel_size*w>>h_shift, s_align);
1e491e29 239
237e4938 240 buf->base[i]= av_mallocz((buf->linesize[i]*h>>v_shift)+16); //FIXME 16
d90cf87b 241 if(buf->base[i]==NULL) return -1;
237e4938 242 memset(buf->base[i], 128, buf->linesize[i]*h>>v_shift);
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243
244 if(s->flags&CODEC_FLAG_EMU_EDGE)
d90cf87b 245 buf->data[i] = buf->base[i];
1e491e29 246 else
237e4938 247 buf->data[i] = buf->base[i] + ALIGN((buf->linesize[i]*EDGE_WIDTH>>v_shift) + (EDGE_WIDTH>>h_shift), s_align);
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248 }
249 pic->age= 256*256*256*64;
250 }
237e4938 251 pic->type= FF_BUFFER_TYPE_INTERNAL;
1e491e29 252
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253 for(i=0; i<4; i++){
254 pic->base[i]= buf->base[i];
255 pic->data[i]= buf->data[i];
237e4938 256 pic->linesize[i]= buf->linesize[i];
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257 }
258 s->internal_buffer_count++;
259
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260 return 0;
261}
262
492cd3a9 263void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic){
1e491e29 264 int i;
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265 InternalBuffer *buf, *last, temp;
266
4e00e76b 267 assert(pic->type==FF_BUFFER_TYPE_INTERNAL);
59c673d5 268 assert(s->internal_buffer_count);
d90cf87b 269
b1609412 270 buf = NULL; /* avoids warning */
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271 for(i=0; i<s->internal_buffer_count; i++){ //just 3-5 checks so is not worth to optimize
272 buf= &((InternalBuffer*)s->internal_buffer)[i];
273 if(buf->data[0] == pic->data[0])
274 break;
275 }
276 assert(i < s->internal_buffer_count);
277 s->internal_buffer_count--;
278 last = &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
279
280 temp= *buf;
281 *buf= *last;
282 *last= temp;
283
284 for(i=0; i<3; i++){
1e491e29 285 pic->data[i]=NULL;
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286// pic->base[i]=NULL;
287 }
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288//printf("R%X\n", pic->opaque);
289}
290
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291enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, enum PixelFormat * fmt){
292 return fmt[0];
293}
294
a949d72e 295void avcodec_get_context_defaults(AVCodecContext *s){
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296 s->bit_rate= 800*1000;
297 s->bit_rate_tolerance= s->bit_rate*10;
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298 s->qmin= 2;
299 s->qmax= 31;
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300 s->mb_qmin= 2;
301 s->mb_qmax= 31;
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302 s->rc_eq= "tex^qComp";
303 s->qcompress= 0.5;
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304 s->max_qdiff= 3;
305 s->b_quant_factor=1.25;
306 s->b_quant_offset=1.25;
b3a391e8 307 s->i_quant_factor=-0.8;
e8b62df6 308 s->i_quant_offset=0.0;
4d2858de 309 s->error_concealment= 3;
8d0e42ca 310 s->error_resilience= 1;
4d2858de 311 s->workaround_bugs= FF_BUG_AUTODETECT;
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312 s->frame_rate_base= 1;
313 s->frame_rate = 25;
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314 s->gop_size= 50;
315 s->me_method= ME_EPZS;
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316 s->get_buffer= avcodec_default_get_buffer;
317 s->release_buffer= avcodec_default_release_buffer;
a33c7159 318 s->get_format= avcodec_default_get_format;
826f429a 319 s->me_subpel_quality=8;
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320 s->lmin= FF_QP2LAMBDA * s->qmin;
321 s->lmax= FF_QP2LAMBDA * s->qmax;
5ff85f1d 322 s->sample_aspect_ratio= (AVRational){0,1};
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323
324 s->intra_quant_bias= FF_DEFAULT_QUANT_BIAS;
325 s->inter_quant_bias= FF_DEFAULT_QUANT_BIAS;
2a2bbcb0 326 s->palctrl = NULL;
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327}
328
329/**
330 * allocates a AVCodecContext and set it to defaults.
331 * this can be deallocated by simply calling free()
332 */
7ffbb60e 333AVCodecContext *avcodec_alloc_context(void){
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334 AVCodecContext *avctx= av_mallocz(sizeof(AVCodecContext));
335
336 if(avctx==NULL) return NULL;
337
338 avcodec_get_context_defaults(avctx);
339
340 return avctx;
341}
342
1e491e29 343/**
492cd3a9 344 * allocates a AVPFrame and set it to defaults.
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345 * this can be deallocated by simply calling free()
346 */
492cd3a9
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347AVFrame *avcodec_alloc_frame(void){
348 AVFrame *pic= av_mallocz(sizeof(AVFrame));
1e491e29
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349
350 return pic;
351}
352
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353int avcodec_open(AVCodecContext *avctx, AVCodec *codec)
354{
355 int ret;
356
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357 if(avctx->codec)
358 return -1;
359
de6d9b64 360 avctx->codec = codec;
4cb3ca72 361 avctx->codec_id = codec->id;
de6d9b64 362 avctx->frame_number = 0;
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363 if (codec->priv_data_size > 0) {
364 avctx->priv_data = av_mallocz(codec->priv_data_size);
365 if (!avctx->priv_data)
366 return -ENOMEM;
367 } else {
368 avctx->priv_data = NULL;
369 }
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370 ret = avctx->codec->init(avctx);
371 if (ret < 0) {
3123dd79 372 av_freep(&avctx->priv_data);
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373 return ret;
374 }
375 return 0;
376}
377
0c1a9eda 378int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size,
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379 const short *samples)
380{
381 int ret;
382
383 ret = avctx->codec->encode(avctx, buf, buf_size, (void *)samples);
384 avctx->frame_number++;
385 return ret;
386}
387
0c1a9eda 388int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
492cd3a9 389 const AVFrame *pict)
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390{
391 int ret;
392
393 ret = avctx->codec->encode(avctx, buf, buf_size, (void *)pict);
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394
395 emms_c(); //needed to avoid a emms_c() call before every return;
396
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397 avctx->frame_number++;
398 return ret;
399}
400
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401/**
402 * decode a frame.
403 * @param buf bitstream buffer, must be FF_INPUT_BUFFER_PADDING_SIZE larger then the actual read bytes
404 * because some optimized bitstream readers read 32 or 64 bit at once and could read over the end
405 * @param buf_size the size of the buffer in bytes
406 * @param got_picture_ptr zero if no frame could be decompressed, Otherwise, it is non zero
407 * @return -1 if error, otherwise return the number of
408 * bytes used.
409 */
492cd3a9 410int avcodec_decode_video(AVCodecContext *avctx, AVFrame *picture,
de6d9b64 411 int *got_picture_ptr,
0c1a9eda 412 uint8_t *buf, int buf_size)
de6d9b64
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413{
414 int ret;
1e491e29 415
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416 ret = avctx->codec->decode(avctx, picture, got_picture_ptr,
417 buf, buf_size);
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418
419 emms_c(); //needed to avoid a emms_c() call before every return;
1e491e29 420
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421 if (*got_picture_ptr)
422 avctx->frame_number++;
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423 return ret;
424}
425
426/* decode an audio frame. return -1 if error, otherwise return the
427 *number of bytes used. If no frame could be decompressed,
428 *frame_size_ptr is zero. Otherwise, it is the decompressed frame
429 *size in BYTES. */
0c1a9eda 430int avcodec_decode_audio(AVCodecContext *avctx, int16_t *samples,
de6d9b64 431 int *frame_size_ptr,
0c1a9eda 432 uint8_t *buf, int buf_size)
de6d9b64
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433{
434 int ret;
435
436 ret = avctx->codec->decode(avctx, samples, frame_size_ptr,
437 buf, buf_size);
438 avctx->frame_number++;
439 return ret;
440}
441
442int avcodec_close(AVCodecContext *avctx)
443{
444 if (avctx->codec->close)
445 avctx->codec->close(avctx);
3123dd79 446 av_freep(&avctx->priv_data);
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447 avctx->codec = NULL;
448 return 0;
449}
450
451AVCodec *avcodec_find_encoder(enum CodecID id)
452{
453 AVCodec *p;
454 p = first_avcodec;
455 while (p) {
456 if (p->encode != NULL && p->id == id)
457 return p;
458 p = p->next;
459 }
460 return NULL;
461}
462
98f3b098
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463AVCodec *avcodec_find_encoder_by_name(const char *name)
464{
465 AVCodec *p;
466 p = first_avcodec;
467 while (p) {
468 if (p->encode != NULL && strcmp(name,p->name) == 0)
469 return p;
470 p = p->next;
471 }
472 return NULL;
473}
474
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475AVCodec *avcodec_find_decoder(enum CodecID id)
476{
477 AVCodec *p;
478 p = first_avcodec;
479 while (p) {
480 if (p->decode != NULL && p->id == id)
481 return p;
482 p = p->next;
483 }
484 return NULL;
485}
486
487AVCodec *avcodec_find_decoder_by_name(const char *name)
488{
489 AVCodec *p;
490 p = first_avcodec;
491 while (p) {
492 if (p->decode != NULL && strcmp(name,p->name) == 0)
493 return p;
494 p = p->next;
495 }
496 return NULL;
497}
498
499AVCodec *avcodec_find(enum CodecID id)
500{
501 AVCodec *p;
502 p = first_avcodec;
503 while (p) {
504 if (p->id == id)
505 return p;
506 p = p->next;
507 }
508 return NULL;
509}
510
511void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)
512{
513 const char *codec_name;
514 AVCodec *p;
515 char buf1[32];
623563c0 516 char channels_str[100];
a96b68b7 517 int bitrate;
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518
519 if (encode)
520 p = avcodec_find_encoder(enc->codec_id);
521 else
522 p = avcodec_find_decoder(enc->codec_id);
523
524 if (p) {
525 codec_name = p->name;
98ce5991
FB
526 if (!encode && enc->codec_id == CODEC_ID_MP3) {
527 if (enc->sub_id == 2)
528 codec_name = "mp2";
529 else if (enc->sub_id == 1)
530 codec_name = "mp1";
531 }
985180a1
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532 } else if (enc->codec_id == CODEC_ID_MPEG2TS) {
533 /* fake mpeg2 transport stream codec (currently not
534 registered) */
535 codec_name = "mpeg2ts";
de6d9b64
FB
536 } else if (enc->codec_name[0] != '\0') {
537 codec_name = enc->codec_name;
538 } else {
539 /* output avi tags */
540 if (enc->codec_type == CODEC_TYPE_VIDEO) {
541 snprintf(buf1, sizeof(buf1), "%c%c%c%c",
542 enc->codec_tag & 0xff,
543 (enc->codec_tag >> 8) & 0xff,
544 (enc->codec_tag >> 16) & 0xff,
545 (enc->codec_tag >> 24) & 0xff);
546 } else {
547 snprintf(buf1, sizeof(buf1), "0x%04x", enc->codec_tag);
548 }
549 codec_name = buf1;
550 }
551
552 switch(enc->codec_type) {
553 case CODEC_TYPE_VIDEO:
554 snprintf(buf, buf_size,
555 "Video: %s%s",
7d1c3fc1 556 codec_name, enc->mb_decision ? " (hq)" : "");
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557 if (enc->codec_id == CODEC_ID_RAWVIDEO) {
558 snprintf(buf + strlen(buf), buf_size - strlen(buf),
559 ", %s",
9bbffbb1 560 avcodec_get_pix_fmt_name(enc->pix_fmt));
cf087595 561 }
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FB
562 if (enc->width) {
563 snprintf(buf + strlen(buf), buf_size - strlen(buf),
564 ", %dx%d, %0.2f fps",
565 enc->width, enc->height,
14bea432 566 (float)enc->frame_rate / enc->frame_rate_base);
de6d9b64 567 }
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FB
568 if (encode) {
569 snprintf(buf + strlen(buf), buf_size - strlen(buf),
570 ", q=%d-%d", enc->qmin, enc->qmax);
571 }
a96b68b7 572 bitrate = enc->bit_rate;
de6d9b64
FB
573 break;
574 case CODEC_TYPE_AUDIO:
575 snprintf(buf, buf_size,
576 "Audio: %s",
577 codec_name);
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578 switch (enc->channels) {
579 case 1:
623563c0 580 strcpy(channels_str, "mono");
e0d2714a
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581 break;
582 case 2:
623563c0 583 strcpy(channels_str, "stereo");
e0d2714a
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584 break;
585 case 6:
623563c0 586 strcpy(channels_str, "5:1");
e0d2714a
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587 break;
588 default:
589 sprintf(channels_str, "%d channels", enc->channels);
590 break;
591 }
de6d9b64
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592 if (enc->sample_rate) {
593 snprintf(buf + strlen(buf), buf_size - strlen(buf),
594 ", %d Hz, %s",
595 enc->sample_rate,
e0d2714a 596 channels_str);
de6d9b64 597 }
e0d2714a 598
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FB
599 /* for PCM codecs, compute bitrate directly */
600 switch(enc->codec_id) {
601 case CODEC_ID_PCM_S16LE:
602 case CODEC_ID_PCM_S16BE:
603 case CODEC_ID_PCM_U16LE:
604 case CODEC_ID_PCM_U16BE:
a190b7e9 605 bitrate = enc->sample_rate * enc->channels * 16;
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FB
606 break;
607 case CODEC_ID_PCM_S8:
608 case CODEC_ID_PCM_U8:
609 case CODEC_ID_PCM_ALAW:
610 case CODEC_ID_PCM_MULAW:
a190b7e9 611 bitrate = enc->sample_rate * enc->channels * 8;
a96b68b7
FB
612 break;
613 default:
614 bitrate = enc->bit_rate;
615 break;
616 }
de6d9b64 617 break;
985180a1
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618 case CODEC_TYPE_DATA:
619 snprintf(buf, buf_size, "Data: %s", codec_name);
620 bitrate = enc->bit_rate;
621 break;
de6d9b64 622 default:
b71472eb 623 av_abort();
de6d9b64 624 }
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625 if (encode) {
626 if (enc->flags & CODEC_FLAG_PASS1)
627 snprintf(buf + strlen(buf), buf_size - strlen(buf),
628 ", pass 1");
629 if (enc->flags & CODEC_FLAG_PASS2)
630 snprintf(buf + strlen(buf), buf_size - strlen(buf),
631 ", pass 2");
632 }
a96b68b7 633 if (bitrate != 0) {
de6d9b64 634 snprintf(buf + strlen(buf), buf_size - strlen(buf),
a96b68b7 635 ", %d kb/s", bitrate / 1000);
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636 }
637}
638
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639unsigned avcodec_version( void )
640{
641 return LIBAVCODEC_VERSION_INT;
642}
cf087595 643
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644unsigned avcodec_build( void )
645{
646 return LIBAVCODEC_BUILD;
647}
648
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649/* must be called before any other functions */
650void avcodec_init(void)
651{
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652 static int inited = 0;
653
654 if (inited != 0)
655 return;
656 inited = 1;
657
59cf08ce 658 dsputil_static_init();
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659}
660
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661/**
662 * Flush buffers, should be called when seeking or when swicthing to a different stream.
663 */
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664void avcodec_flush_buffers(AVCodecContext *avctx)
665{
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666 if(avctx->codec->flush)
667 avctx->codec->flush(avctx);
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668}
669
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670void avcodec_default_free_buffers(AVCodecContext *s){
671 int i, j;
672
673 if(s->internal_buffer==NULL) return;
674
675 for(i=0; i<INTERNAL_BUFFER_SIZE; i++){
676 InternalBuffer *buf= &((InternalBuffer*)s->internal_buffer)[i];
677 for(j=0; j<4; j++){
678 av_freep(&buf->base[j]);
679 buf->data[j]= NULL;
680 }
681 }
682 av_freep(&s->internal_buffer);
683
684 s->internal_buffer_count=0;
685}
686
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687char av_get_pict_type_char(int pict_type){
688 switch(pict_type){
689 case I_TYPE: return 'I';
690 case P_TYPE: return 'P';
691 case B_TYPE: return 'B';
692 case S_TYPE: return 'S';
693 case SI_TYPE:return 'i';
694 case SP_TYPE:return 'p';
695 default: return '?';
696 }
697}
698
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699int av_reduce(int *dst_nom, int *dst_den, int64_t nom, int64_t den, int64_t max){
700 int exact=1, sign=0;
5ed9f2e5 701 int64_t gcd;
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702
703 assert(den != 0);
704
705 if(den < 0){
706 den= -den;
707 nom= -nom;
708 }
709
710 if(nom < 0){
711 nom= -nom;
712 sign= 1;
713 }
714
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715 gcd = ff_gcd(nom, den);
716 nom /= gcd;
717 den /= gcd;
14bea432 718
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719 if(nom > max || den > max){
720 AVRational a0={0,1}, a1={1,0};
721 exact=0;
722
723 for(;;){
724 int64_t x= nom / den;
725 int64_t a2n= x*a1.num + a0.num;
726 int64_t a2d= x*a1.den + a0.den;
727
728 if(a2n > max || a2d > max) break;
729
730 nom %= den;
731
732 a0= a1;
733 a1= (AVRational){a2n, a2d};
734 if(nom==0) break;
735 x= nom; nom=den; den=x;
736 }
737 nom= a1.num;
738 den= a1.den;
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739 }
740
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741 assert(ff_gcd(nom, den) == 1);
742
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743 if(sign) nom= -nom;
744
745 *dst_nom = nom;
746 *dst_den = den;
747
748 return exact;
749}
750
751int64_t av_rescale(int64_t a, int b, int c){
752 uint64_t h, l;
753 assert(c > 0);
754 assert(b >=0);
755
756 if(a<0) return -av_rescale(-a, b, c);
757
758 h= a>>32;
759 if(h==0) return a*b/c;
760
761 l= a&0xFFFFFFFF;
762 l *= b;
763 h *= b;
764
765 l += (h%c)<<32;
766
767 return ((h/c)<<32) + l/c;
768}