10l (obmc_scratchpad not always initialize)
[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
8f2ab833 5 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
de6d9b64 6 *
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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.
de6d9b64 11 *
ff4ec49e 12 * This library is distributed in the hope that it will be useful,
de6d9b64 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
de6d9b64 16 *
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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
de6d9b64 20 */
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21
22/**
23 * @file utils.c
24 * utils.
25 */
26
de6d9b64 27#include "avcodec.h"
3123dd79 28#include "dsputil.h"
1c2a8c7f 29#include "mpegvideo.h"
4c263142 30#include "integer.h"
9b879566 31#include <stdarg.h>
4c263142 32#include <limits.h>
de6d9b64 33
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34const 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
41const 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
b100eab8 52void avcodec_default_free_buffers(AVCodecContext *s);
eea8c08f 53
18f77016 54void *av_mallocz(unsigned int size)
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55{
56 void *ptr;
5b20b732 57
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58 ptr = av_malloc(size);
59 if (!ptr)
60 return NULL;
61 memset(ptr, 0, size);
62 return ptr;
63}
64
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65char *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 */
5c91a675 80void *av_fast_realloc(void *ptr, unsigned int *size, unsigned int min_size)
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81{
82 if(min_size < *size)
83 return ptr;
84
4e39ab4c 85 *size= 17*min_size/16 + 32;
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86
87 return av_realloc(ptr, *size);
88}
89
90
855ea723 91static unsigned int last_static = 0;
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92static unsigned int allocated_static = 0;
93static void** array_static = NULL;
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94
95/**
96 * allocation of static arrays - do not use for normal allocation.
97 */
98void *av_mallocz_static(unsigned int size)
855ea723 99{
855ea723 100 void *ptr = av_mallocz(size);
855ea723 101
8d1f2ba5 102 if(ptr){
4e39ab4c 103 array_static =av_fast_realloc(array_static, &allocated_static, sizeof(void*)*(last_static+1));
8d1f2ba5 104 array_static[last_static++] = ptr;
855ea723 105 }
8d1f2ba5 106
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107 return ptr;
108}
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109
110/**
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111 * same as above, but does realloc
112 */
113
114void *av_realloc_static(void *ptr, unsigned int size)
115{
116 int i;
117 if(!ptr)
118 return av_mallocz_static(size);
119 /* Look for the old ptr */
120 for(i = 0; i < last_static; i++) {
121 if(array_static[i] == ptr) {
122 array_static[i] = av_realloc(array_static[i], size);
123 return array_static[i];
124 }
125 }
126 return NULL;
127
128}
129
130/**
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131 * free all static arrays and reset pointers to 0.
132 */
4cfbf61b 133void av_free_static(void)
855ea723 134{
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135 while(last_static){
136 av_freep(&array_static[--last_static]);
855ea723 137 }
8d1f2ba5 138 av_freep(&array_static);
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139}
140
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141/**
142 * Frees memory and sets the pointer to NULL.
143 * @param arg pointer to the pointer which should be freed
144 */
145void av_freep(void *arg)
4d7a0a05 146{
81c5f887 147 void **ptr= (void**)arg;
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148 av_free(*ptr);
149 *ptr = NULL;
150}
151
de6d9b64 152/* encoder management */
8b69867f 153AVCodec *first_avcodec = NULL;
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154
155void register_avcodec(AVCodec *format)
156{
157 AVCodec **p;
158 p = &first_avcodec;
159 while (*p != NULL) p = &(*p)->next;
160 *p = format;
161 format->next = NULL;
162}
163
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164void avcodec_set_dimensions(AVCodecContext *s, int width, int height){
165 s->coded_width = width;
166 s->coded_height= height;
167 s->width = -((-width )>>s->lowres);
168 s->height= -((-height)>>s->lowres);
169}
170
d90cf87b 171typedef struct InternalBuffer{
1e491e29 172 int last_pic_num;
d90cf87b 173 uint8_t *base[4];
1e491e29 174 uint8_t *data[4];
237e4938 175 int linesize[4];
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176}InternalBuffer;
177
178#define INTERNAL_BUFFER_SIZE 32
1e491e29 179
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180#define ALIGN(x, a) (((x)+(a)-1)&~((a)-1))
181
182void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height){
183 int w_align= 1;
184 int h_align= 1;
185
186 switch(s->pix_fmt){
187 case PIX_FMT_YUV420P:
188 case PIX_FMT_YUV422:
ebb177dd 189 case PIX_FMT_UYVY422:
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190 case PIX_FMT_YUV422P:
191 case PIX_FMT_YUV444P:
192 case PIX_FMT_GRAY8:
193 case PIX_FMT_YUVJ420P:
194 case PIX_FMT_YUVJ422P:
195 case PIX_FMT_YUVJ444P:
196 w_align= 16; //FIXME check for non mpeg style codecs and use less alignment
197 h_align= 16;
198 break;
199 case PIX_FMT_YUV411P:
f02be79d 200 case PIX_FMT_UYVY411:
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201 w_align=32;
202 h_align=8;
203 break;
204 case PIX_FMT_YUV410P:
205 if(s->codec_id == CODEC_ID_SVQ1){
206 w_align=64;
207 h_align=64;
208 }
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209 case PIX_FMT_RGB555:
210 if(s->codec_id == CODEC_ID_RPZA){
211 w_align=4;
212 h_align=4;
213 }
214 case PIX_FMT_PAL8:
215 if(s->codec_id == CODEC_ID_SMC){
216 w_align=4;
217 h_align=4;
218 }
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219 break;
220 default:
221 w_align= 1;
222 h_align= 1;
223 break;
224 }
225
226 *width = ALIGN(*width , w_align);
227 *height= ALIGN(*height, h_align);
228}
229
492cd3a9 230int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic){
1e491e29 231 int i;
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232 int w= s->width;
233 int h= s->height;
d90cf87b 234 InternalBuffer *buf;
237e4938 235 int *picture_number;
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236
237 assert(pic->data[0]==NULL);
d90cf87b 238 assert(INTERNAL_BUFFER_SIZE > s->internal_buffer_count);
1e491e29 239
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240 if(s->internal_buffer==NULL){
241 s->internal_buffer= av_mallocz(INTERNAL_BUFFER_SIZE*sizeof(InternalBuffer));
242 }
243#if 0
244 s->internal_buffer= av_fast_realloc(
245 s->internal_buffer,
246 &s->internal_buffer_size,
247 sizeof(InternalBuffer)*FFMAX(99, s->internal_buffer_count+1)/*FIXME*/
248 );
249#endif
250
251 buf= &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
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252 picture_number= &(((InternalBuffer*)s->internal_buffer)[INTERNAL_BUFFER_SIZE-1]).last_pic_num; //FIXME ugly hack
253 (*picture_number)++;
254
d90cf87b 255 if(buf->base[0]){
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256 pic->age= *picture_number - buf->last_pic_num;
257 buf->last_pic_num= *picture_number;
1e491e29 258 }else{
f0bbfc4a 259 int h_chroma_shift, v_chroma_shift;
3237f731 260 int pixel_size;
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261
262 avcodec_get_chroma_sub_sample(s->pix_fmt, &h_chroma_shift, &v_chroma_shift);
f0bbfc4a 263
1e491e29 264 switch(s->pix_fmt){
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265 case PIX_FMT_RGB555:
266 case PIX_FMT_RGB565:
1e491e29 267 case PIX_FMT_YUV422:
ebb177dd 268 case PIX_FMT_UYVY422:
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269 pixel_size=2;
270 break;
271 case PIX_FMT_RGB24:
272 case PIX_FMT_BGR24:
273 pixel_size=3;
274 break;
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275 case PIX_FMT_RGBA32:
276 pixel_size=4;
277 break;
278 default:
279 pixel_size=1;
280 }
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281
282 avcodec_align_dimensions(s, &w, &h);
f0bbfc4a 283
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284 if(!(s->flags&CODEC_FLAG_EMU_EDGE)){
285 w+= EDGE_WIDTH*2;
286 h+= EDGE_WIDTH*2;
287 }
288
d90cf87b 289 buf->last_pic_num= -256*256*256*64;
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290
291 for(i=0; i<3; i++){
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292 const int h_shift= i==0 ? 0 : h_chroma_shift;
293 const int v_shift= i==0 ? 0 : v_chroma_shift;
1e491e29 294
7984082a 295 //FIXME next ensures that linesize= 2^x uvlinesize, thats needed because some MC code assumes it
3237f731 296 buf->linesize[i]= ALIGN(pixel_size*w>>h_shift, STRIDE_ALIGN<<(h_chroma_shift-h_shift));
1e491e29 297
237e4938 298 buf->base[i]= av_mallocz((buf->linesize[i]*h>>v_shift)+16); //FIXME 16
d90cf87b 299 if(buf->base[i]==NULL) return -1;
237e4938 300 memset(buf->base[i], 128, buf->linesize[i]*h>>v_shift);
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301
302 if(s->flags&CODEC_FLAG_EMU_EDGE)
d90cf87b 303 buf->data[i] = buf->base[i];
1e491e29 304 else
3237f731 305 buf->data[i] = buf->base[i] + ALIGN((buf->linesize[i]*EDGE_WIDTH>>v_shift) + (EDGE_WIDTH>>h_shift), STRIDE_ALIGN);
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306 }
307 pic->age= 256*256*256*64;
308 }
237e4938 309 pic->type= FF_BUFFER_TYPE_INTERNAL;
1e491e29 310
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311 for(i=0; i<4; i++){
312 pic->base[i]= buf->base[i];
313 pic->data[i]= buf->data[i];
237e4938 314 pic->linesize[i]= buf->linesize[i];
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315 }
316 s->internal_buffer_count++;
317
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318 return 0;
319}
320
492cd3a9 321void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic){
1e491e29 322 int i;
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323 InternalBuffer *buf, *last, temp;
324
4e00e76b 325 assert(pic->type==FF_BUFFER_TYPE_INTERNAL);
59c673d5 326 assert(s->internal_buffer_count);
d90cf87b 327
b1609412 328 buf = NULL; /* avoids warning */
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329 for(i=0; i<s->internal_buffer_count; i++){ //just 3-5 checks so is not worth to optimize
330 buf= &((InternalBuffer*)s->internal_buffer)[i];
331 if(buf->data[0] == pic->data[0])
332 break;
333 }
334 assert(i < s->internal_buffer_count);
335 s->internal_buffer_count--;
336 last = &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
337
338 temp= *buf;
339 *buf= *last;
340 *last= temp;
341
342 for(i=0; i<3; i++){
1e491e29 343 pic->data[i]=NULL;
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344// pic->base[i]=NULL;
345 }
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346//printf("R%X\n", pic->opaque);
347}
348
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349int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic){
350 AVFrame temp_pic;
351 int i;
352
353 /* If no picture return a new buffer */
354 if(pic->data[0] == NULL) {
355 /* We will copy from buffer, so must be readable */
356 pic->buffer_hints |= FF_BUFFER_HINTS_READABLE;
357 return s->get_buffer(s, pic);
358 }
359
360 /* If internal buffer type return the same buffer */
361 if(pic->type == FF_BUFFER_TYPE_INTERNAL)
362 return 0;
363
364 /*
365 * Not internal type and reget_buffer not overridden, emulate cr buffer
366 */
367 temp_pic = *pic;
368 for(i = 0; i < 4; i++)
369 pic->data[i] = pic->base[i] = NULL;
370 pic->opaque = NULL;
371 /* Allocate new frame */
372 if (s->get_buffer(s, pic))
373 return -1;
374 /* Copy image data from old buffer to new buffer */
375 img_copy((AVPicture*)pic, (AVPicture*)&temp_pic, s->pix_fmt, s->width,
376 s->height);
377 s->release_buffer(s, &temp_pic); // Release old frame
378 return 0;
379}
380
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381int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void **arg, int *ret, int count){
382 int i;
383
384 for(i=0; i<count; i++){
385 int r= func(c, arg[i]);
386 if(ret) ret[i]= r;
387 }
388 return 0;
389}
390
494c56d3 391enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat * fmt){
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392 return fmt[0];
393}
394
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395static const char* context_to_name(void* ptr) {
396 AVCodecContext *avc= ptr;
397
398 if(avc && avc->codec && avc->codec->name)
399 return avc->codec->name;
400 else
401 return "NULL";
402}
403
404static AVClass av_codec_context_class = { "AVCodecContext", context_to_name };
405
a949d72e 406void avcodec_get_context_defaults(AVCodecContext *s){
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407 memset(s, 0, sizeof(AVCodecContext));
408
43465395 409 s->av_class= &av_codec_context_class;
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410 s->bit_rate= 800*1000;
411 s->bit_rate_tolerance= s->bit_rate*10;
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412 s->qmin= 2;
413 s->qmax= 31;
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414 s->mb_qmin= 2;
415 s->mb_qmax= 31;
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416 s->rc_eq= "tex^qComp";
417 s->qcompress= 0.5;
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418 s->max_qdiff= 3;
419 s->b_quant_factor=1.25;
420 s->b_quant_offset=1.25;
b3a391e8 421 s->i_quant_factor=-0.8;
e8b62df6 422 s->i_quant_offset=0.0;
4d2858de 423 s->error_concealment= 3;
8d0e42ca 424 s->error_resilience= 1;
4d2858de 425 s->workaround_bugs= FF_BUG_AUTODETECT;
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426 s->frame_rate_base= 1;
427 s->frame_rate = 25;
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428 s->gop_size= 50;
429 s->me_method= ME_EPZS;
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430 s->get_buffer= avcodec_default_get_buffer;
431 s->release_buffer= avcodec_default_release_buffer;
a33c7159 432 s->get_format= avcodec_default_get_format;
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433 s->execute= avcodec_default_execute;
434 s->thread_count=1;
826f429a 435 s->me_subpel_quality=8;
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436 s->lmin= FF_QP2LAMBDA * s->qmin;
437 s->lmax= FF_QP2LAMBDA * s->qmax;
5ff85f1d 438 s->sample_aspect_ratio= (AVRational){0,1};
620fe604 439 s->ildct_cmp= FF_CMP_VSAD;
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440 s->profile= FF_PROFILE_UNKNOWN;
441 s->level= FF_LEVEL_UNKNOWN;
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442
443 s->intra_quant_bias= FF_DEFAULT_QUANT_BIAS;
444 s->inter_quant_bias= FF_DEFAULT_QUANT_BIAS;
2a2bbcb0 445 s->palctrl = NULL;
e1c2a5a0 446 s->reget_buffer= avcodec_default_reget_buffer;
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447}
448
449/**
450 * allocates a AVCodecContext and set it to defaults.
451 * this can be deallocated by simply calling free()
452 */
7ffbb60e 453AVCodecContext *avcodec_alloc_context(void){
9740beff 454 AVCodecContext *avctx= av_malloc(sizeof(AVCodecContext));
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455
456 if(avctx==NULL) return NULL;
457
458 avcodec_get_context_defaults(avctx);
459
460 return avctx;
461}
462
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463void avcodec_get_frame_defaults(AVFrame *pic){
464 memset(pic, 0, sizeof(AVFrame));
465
466 pic->pts= AV_NOPTS_VALUE;
467}
468
1e491e29 469/**
492cd3a9 470 * allocates a AVPFrame and set it to defaults.
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471 * this can be deallocated by simply calling free()
472 */
492cd3a9 473AVFrame *avcodec_alloc_frame(void){
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474 AVFrame *pic= av_malloc(sizeof(AVFrame));
475
476 if(pic==NULL) return NULL;
477
478 avcodec_get_frame_defaults(pic);
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479
480 return pic;
481}
482
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483int avcodec_open(AVCodecContext *avctx, AVCodec *codec)
484{
485 int ret;
486
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487 if(avctx->codec)
488 return -1;
489
de6d9b64 490 avctx->codec = codec;
4cb3ca72 491 avctx->codec_id = codec->id;
de6d9b64 492 avctx->frame_number = 0;
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493 if (codec->priv_data_size > 0) {
494 avctx->priv_data = av_mallocz(codec->priv_data_size);
495 if (!avctx->priv_data)
496 return -ENOMEM;
497 } else {
498 avctx->priv_data = NULL;
499 }
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500
501 if(avctx->coded_width && avctx->coded_height)
502 avcodec_set_dimensions(avctx, avctx->coded_width, avctx->coded_height);
503 else if(avctx->width && avctx->height)
504 avcodec_set_dimensions(avctx, avctx->width, avctx->height);
505
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506 ret = avctx->codec->init(avctx);
507 if (ret < 0) {
3123dd79 508 av_freep(&avctx->priv_data);
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509 return ret;
510 }
511 return 0;
512}
513
0c1a9eda 514int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size,
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515 const short *samples)
516{
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517 if((avctx->codec->capabilities & CODEC_CAP_DELAY) || samples){
518 int ret = avctx->codec->encode(avctx, buf, buf_size, (void *)samples);
519 avctx->frame_number++;
520 return ret;
521 }else
522 return 0;
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523}
524
0c1a9eda 525int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
492cd3a9 526 const AVFrame *pict)
de6d9b64 527{
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528 if((avctx->codec->capabilities & CODEC_CAP_DELAY) || pict){
529 int ret = avctx->codec->encode(avctx, buf, buf_size, (void *)pict);
530 avctx->frame_number++;
531 emms_c(); //needed to avoid a emms_c() call before every return;
6bb925f4 532
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533 return ret;
534 }else
535 return 0;
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536}
537
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538/**
539 * decode a frame.
540 * @param buf bitstream buffer, must be FF_INPUT_BUFFER_PADDING_SIZE larger then the actual read bytes
541 * because some optimized bitstream readers read 32 or 64 bit at once and could read over the end
542 * @param buf_size the size of the buffer in bytes
543 * @param got_picture_ptr zero if no frame could be decompressed, Otherwise, it is non zero
544 * @return -1 if error, otherwise return the number of
545 * bytes used.
546 */
492cd3a9 547int avcodec_decode_video(AVCodecContext *avctx, AVFrame *picture,
de6d9b64 548 int *got_picture_ptr,
0c1a9eda 549 uint8_t *buf, int buf_size)
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550{
551 int ret;
1e491e29 552
53db1cae 553 *got_picture_ptr= 0;
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554 ret = avctx->codec->decode(avctx, picture, got_picture_ptr,
555 buf, buf_size);
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556
557 emms_c(); //needed to avoid a emms_c() call before every return;
1e491e29 558
1cb0edb4
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559 if (*got_picture_ptr)
560 avctx->frame_number++;
de6d9b64
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561 return ret;
562}
563
564/* decode an audio frame. return -1 if error, otherwise return the
565 *number of bytes used. If no frame could be decompressed,
566 *frame_size_ptr is zero. Otherwise, it is the decompressed frame
567 *size in BYTES. */
0c1a9eda 568int avcodec_decode_audio(AVCodecContext *avctx, int16_t *samples,
de6d9b64 569 int *frame_size_ptr,
0c1a9eda 570 uint8_t *buf, int buf_size)
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571{
572 int ret;
573
53db1cae 574 *frame_size_ptr= 0;
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575 ret = avctx->codec->decode(avctx, samples, frame_size_ptr,
576 buf, buf_size);
577 avctx->frame_number++;
578 return ret;
579}
580
581int avcodec_close(AVCodecContext *avctx)
582{
583 if (avctx->codec->close)
584 avctx->codec->close(avctx);
eea8c08f 585 avcodec_default_free_buffers(avctx);
3123dd79 586 av_freep(&avctx->priv_data);
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587 avctx->codec = NULL;
588 return 0;
589}
590
591AVCodec *avcodec_find_encoder(enum CodecID id)
592{
593 AVCodec *p;
594 p = first_avcodec;
595 while (p) {
596 if (p->encode != NULL && p->id == id)
597 return p;
598 p = p->next;
599 }
600 return NULL;
601}
602
98f3b098
A
603AVCodec *avcodec_find_encoder_by_name(const char *name)
604{
605 AVCodec *p;
606 p = first_avcodec;
607 while (p) {
608 if (p->encode != NULL && strcmp(name,p->name) == 0)
609 return p;
610 p = p->next;
611 }
612 return NULL;
613}
614
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615AVCodec *avcodec_find_decoder(enum CodecID id)
616{
617 AVCodec *p;
618 p = first_avcodec;
619 while (p) {
620 if (p->decode != NULL && p->id == id)
621 return p;
622 p = p->next;
623 }
624 return NULL;
625}
626
627AVCodec *avcodec_find_decoder_by_name(const char *name)
628{
629 AVCodec *p;
630 p = first_avcodec;
631 while (p) {
632 if (p->decode != NULL && strcmp(name,p->name) == 0)
633 return p;
634 p = p->next;
635 }
636 return NULL;
637}
638
50071f0b 639static AVCodec *avcodec_find(enum CodecID id)
de6d9b64
FB
640{
641 AVCodec *p;
642 p = first_avcodec;
643 while (p) {
644 if (p->id == id)
645 return p;
646 p = p->next;
647 }
648 return NULL;
649}
650
651void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)
652{
653 const char *codec_name;
654 AVCodec *p;
655 char buf1[32];
623563c0 656 char channels_str[100];
a96b68b7 657 int bitrate;
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658
659 if (encode)
660 p = avcodec_find_encoder(enc->codec_id);
661 else
662 p = avcodec_find_decoder(enc->codec_id);
663
664 if (p) {
665 codec_name = p->name;
98ce5991
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666 if (!encode && enc->codec_id == CODEC_ID_MP3) {
667 if (enc->sub_id == 2)
668 codec_name = "mp2";
669 else if (enc->sub_id == 1)
670 codec_name = "mp1";
671 }
985180a1
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672 } else if (enc->codec_id == CODEC_ID_MPEG2TS) {
673 /* fake mpeg2 transport stream codec (currently not
674 registered) */
675 codec_name = "mpeg2ts";
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676 } else if (enc->codec_name[0] != '\0') {
677 codec_name = enc->codec_name;
678 } else {
679 /* output avi tags */
680 if (enc->codec_type == CODEC_TYPE_VIDEO) {
681 snprintf(buf1, sizeof(buf1), "%c%c%c%c",
682 enc->codec_tag & 0xff,
683 (enc->codec_tag >> 8) & 0xff,
684 (enc->codec_tag >> 16) & 0xff,
685 (enc->codec_tag >> 24) & 0xff);
686 } else {
687 snprintf(buf1, sizeof(buf1), "0x%04x", enc->codec_tag);
688 }
689 codec_name = buf1;
690 }
691
692 switch(enc->codec_type) {
693 case CODEC_TYPE_VIDEO:
694 snprintf(buf, buf_size,
695 "Video: %s%s",
7d1c3fc1 696 codec_name, enc->mb_decision ? " (hq)" : "");
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697 if (enc->codec_id == CODEC_ID_RAWVIDEO) {
698 snprintf(buf + strlen(buf), buf_size - strlen(buf),
699 ", %s",
9bbffbb1 700 avcodec_get_pix_fmt_name(enc->pix_fmt));
cf087595 701 }
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702 if (enc->width) {
703 snprintf(buf + strlen(buf), buf_size - strlen(buf),
704 ", %dx%d, %0.2f fps",
705 enc->width, enc->height,
14bea432 706 (float)enc->frame_rate / enc->frame_rate_base);
de6d9b64 707 }
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708 if (encode) {
709 snprintf(buf + strlen(buf), buf_size - strlen(buf),
710 ", q=%d-%d", enc->qmin, enc->qmax);
711 }
a96b68b7 712 bitrate = enc->bit_rate;
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713 break;
714 case CODEC_TYPE_AUDIO:
715 snprintf(buf, buf_size,
716 "Audio: %s",
717 codec_name);
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J
718 switch (enc->channels) {
719 case 1:
623563c0 720 strcpy(channels_str, "mono");
e0d2714a
J
721 break;
722 case 2:
623563c0 723 strcpy(channels_str, "stereo");
e0d2714a
J
724 break;
725 case 6:
623563c0 726 strcpy(channels_str, "5:1");
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727 break;
728 default:
729 sprintf(channels_str, "%d channels", enc->channels);
730 break;
731 }
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732 if (enc->sample_rate) {
733 snprintf(buf + strlen(buf), buf_size - strlen(buf),
734 ", %d Hz, %s",
735 enc->sample_rate,
e0d2714a 736 channels_str);
de6d9b64 737 }
e0d2714a 738
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FB
739 /* for PCM codecs, compute bitrate directly */
740 switch(enc->codec_id) {
741 case CODEC_ID_PCM_S16LE:
742 case CODEC_ID_PCM_S16BE:
743 case CODEC_ID_PCM_U16LE:
744 case CODEC_ID_PCM_U16BE:
a190b7e9 745 bitrate = enc->sample_rate * enc->channels * 16;
a96b68b7
FB
746 break;
747 case CODEC_ID_PCM_S8:
748 case CODEC_ID_PCM_U8:
749 case CODEC_ID_PCM_ALAW:
750 case CODEC_ID_PCM_MULAW:
a190b7e9 751 bitrate = enc->sample_rate * enc->channels * 8;
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FB
752 break;
753 default:
754 bitrate = enc->bit_rate;
755 break;
756 }
de6d9b64 757 break;
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758 case CODEC_TYPE_DATA:
759 snprintf(buf, buf_size, "Data: %s", codec_name);
760 bitrate = enc->bit_rate;
761 break;
de6d9b64 762 default:
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763 snprintf(buf, buf_size, "Invalid Codec type %d", enc->codec_type);
764 return;
de6d9b64 765 }
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766 if (encode) {
767 if (enc->flags & CODEC_FLAG_PASS1)
768 snprintf(buf + strlen(buf), buf_size - strlen(buf),
769 ", pass 1");
770 if (enc->flags & CODEC_FLAG_PASS2)
771 snprintf(buf + strlen(buf), buf_size - strlen(buf),
772 ", pass 2");
773 }
a96b68b7 774 if (bitrate != 0) {
de6d9b64 775 snprintf(buf + strlen(buf), buf_size - strlen(buf),
a96b68b7 776 ", %d kb/s", bitrate / 1000);
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777 }
778}
779
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780unsigned avcodec_version( void )
781{
782 return LIBAVCODEC_VERSION_INT;
783}
cf087595 784
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785unsigned avcodec_build( void )
786{
787 return LIBAVCODEC_BUILD;
788}
789
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790/* must be called before any other functions */
791void avcodec_init(void)
792{
0344cd0a
AB
793 static int inited = 0;
794
795 if (inited != 0)
796 return;
797 inited = 1;
798
59cf08ce 799 dsputil_static_init();
de6d9b64
FB
800}
801
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802/**
803 * Flush buffers, should be called when seeking or when swicthing to a different stream.
804 */
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805void avcodec_flush_buffers(AVCodecContext *avctx)
806{
7a06ff14
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807 if(avctx->codec->flush)
808 avctx->codec->flush(avctx);
1c2a8c7f
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809}
810
b100eab8 811void avcodec_default_free_buffers(AVCodecContext *s){
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812 int i, j;
813
814 if(s->internal_buffer==NULL) return;
815
816 for(i=0; i<INTERNAL_BUFFER_SIZE; i++){
817 InternalBuffer *buf= &((InternalBuffer*)s->internal_buffer)[i];
818 for(j=0; j<4; j++){
819 av_freep(&buf->base[j]);
820 buf->data[j]= NULL;
821 }
822 }
823 av_freep(&s->internal_buffer);
824
825 s->internal_buffer_count=0;
826}
827
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828char av_get_pict_type_char(int pict_type){
829 switch(pict_type){
830 case I_TYPE: return 'I';
831 case P_TYPE: return 'P';
832 case B_TYPE: return 'B';
833 case S_TYPE: return 'S';
834 case SI_TYPE:return 'i';
835 case SP_TYPE:return 'p';
836 default: return '?';
837 }
838}
839
14bea432 840int av_reduce(int *dst_nom, int *dst_den, int64_t nom, int64_t den, int64_t max){
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841 AVRational a0={0,1}, a1={1,0};
842 int sign= (nom<0) ^ (den<0);
843 int64_t gcd= ff_gcd(ABS(nom), ABS(den));
844
845 nom = ABS(nom)/gcd;
846 den = ABS(den)/gcd;
847 if(nom<=max && den<=max){
848 a1= (AVRational){nom, den};
849 den=0;
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850 }
851
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852 while(den){
853 int64_t x = nom / den;
854 int64_t next_den= nom - den*x;
855 int64_t a2n= x*a1.num + a0.num;
856 int64_t a2d= x*a1.den + a0.den;
857
858 if(a2n > max || a2d > max) break;
859
860 a0= a1;
861 a1= (AVRational){a2n, a2d};
862 nom= den;
863 den= next_den;
864 }
865 assert(ff_gcd(a1.num, a1.den) == 1);
5ed9f2e5 866
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867 *dst_nom = sign ? -a1.num : a1.num;
868 *dst_den = a1.den;
14bea432 869
5f63d108 870 return den==0;
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871}
872
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873int64_t av_rescale_rnd(int64_t a, int64_t b, int64_t c, enum AVRounding rnd){
874 AVInteger ai;
875 int64_t r=0;
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876 assert(c > 0);
877 assert(b >=0);
1f018225 878 assert(rnd >=0 && rnd<=5 && rnd!=4);
14bea432 879
15862411 880 if(a<0 && a != INT64_MIN) return -av_rescale_rnd(-a, b, c, rnd ^ ((rnd>>1)&1));
14bea432 881
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882 if(rnd==AV_ROUND_NEAR_INF) r= c/2;
883 else if(rnd&1) r= c-1;
884
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MN
885 if(b<=INT_MAX && c<=INT_MAX){
886 if(a<=INT_MAX)
1f018225 887 return (a * b + r)/c;
4c263142 888 else
1f018225 889 return a/c*b + (a%c*b + r)/c;
4c263142 890 }
14bea432 891
4c263142 892 ai= av_mul_i(av_int2i(a), av_int2i(b));
1f018225 893 ai= av_add_i(ai, av_int2i(r));
4c263142 894
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895 return av_i2int(av_div_i(ai, av_int2i(c)));
896}
897
898int64_t av_rescale(int64_t a, int64_t b, int64_t c){
899 return av_rescale_rnd(a, b, c, AV_ROUND_NEAR_INF);
14bea432 900}
9b879566 901
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902int64_t ff_gcd(int64_t a, int64_t b){
903 if(b) return ff_gcd(b, a%b);
904 else return a;
905}
906
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907/* av_log API */
908
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909static int av_log_level = AV_LOG_DEBUG;
910
bc874dae 911static void av_log_default_callback(void* ptr, int level, const char* fmt, va_list vl)
9b879566 912{
89b9441a 913 static int print_prefix=1;
43465395 914 AVClass* avc= ptr ? *(AVClass**)ptr : NULL;
9b879566 915 if(level>av_log_level)
bc874dae 916 return;
d705e4a6 917#undef fprintf
43465395
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918 if(print_prefix && avc) {
919 fprintf(stderr, "[%s @ %p]", avc->item_name(ptr), avc);
bc874dae 920 }
d705e4a6 921#define fprintf please_use_av_log
89b9441a 922
95ba2c8f 923 print_prefix= strstr(fmt, "\n") != NULL;
89b9441a 924
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925 vfprintf(stderr, fmt, vl);
926}
927
bc874dae 928static void (*av_log_callback)(void*, int, const char*, va_list) = av_log_default_callback;
9b879566 929
bc874dae 930void av_log(void* avcl, int level, const char *fmt, ...)
9b879566
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931{
932 va_list vl;
933 va_start(vl, fmt);
bc874dae 934 av_vlog(avcl, level, fmt, vl);
9b879566
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935 va_end(vl);
936}
937
bc874dae 938void av_vlog(void* avcl, int level, const char *fmt, va_list vl)
9b879566 939{
bc874dae 940 av_log_callback(avcl, level, fmt, vl);
9b879566
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941}
942
943int av_log_get_level(void)
944{
945 return av_log_level;
946}
947
948void av_log_set_level(int level)
949{
950 av_log_level = level;
951}
952
bc874dae 953void av_log_set_callback(void (*callback)(void*, int, const char*, va_list))
9b879566
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954{
955 av_log_callback = callback;
956}
957
2450cff2 958#if !defined(HAVE_THREADS)
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959int avcodec_thread_init(AVCodecContext *s, int thread_count){
960 return -1;
961}
962#endif