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[libav.git] / libavcodec / utils.c
CommitLineData
de6d9b64
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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 }
f0bbfc4a 219 break;
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220 case PIX_FMT_BGR24:
221 if((s->codec_id == CODEC_ID_MSZH) || (s->codec_id == CODEC_ID_ZLIB)){
222 w_align=4;
223 h_align=4;
224 }
225 break;
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226 default:
227 w_align= 1;
228 h_align= 1;
229 break;
230 }
231
232 *width = ALIGN(*width , w_align);
233 *height= ALIGN(*height, h_align);
234}
235
492cd3a9 236int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic){
1e491e29 237 int i;
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238 int w= s->width;
239 int h= s->height;
d90cf87b 240 InternalBuffer *buf;
237e4938 241 int *picture_number;
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242
243 assert(pic->data[0]==NULL);
d90cf87b 244 assert(INTERNAL_BUFFER_SIZE > s->internal_buffer_count);
1e491e29 245
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246 if(s->internal_buffer==NULL){
247 s->internal_buffer= av_mallocz(INTERNAL_BUFFER_SIZE*sizeof(InternalBuffer));
248 }
249#if 0
250 s->internal_buffer= av_fast_realloc(
251 s->internal_buffer,
252 &s->internal_buffer_size,
253 sizeof(InternalBuffer)*FFMAX(99, s->internal_buffer_count+1)/*FIXME*/
254 );
255#endif
256
257 buf= &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
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258 picture_number= &(((InternalBuffer*)s->internal_buffer)[INTERNAL_BUFFER_SIZE-1]).last_pic_num; //FIXME ugly hack
259 (*picture_number)++;
260
d90cf87b 261 if(buf->base[0]){
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262 pic->age= *picture_number - buf->last_pic_num;
263 buf->last_pic_num= *picture_number;
1e491e29 264 }else{
f0bbfc4a 265 int h_chroma_shift, v_chroma_shift;
3237f731 266 int pixel_size;
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267
268 avcodec_get_chroma_sub_sample(s->pix_fmt, &h_chroma_shift, &v_chroma_shift);
f0bbfc4a 269
1e491e29 270 switch(s->pix_fmt){
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271 case PIX_FMT_RGB555:
272 case PIX_FMT_RGB565:
1e491e29 273 case PIX_FMT_YUV422:
ebb177dd 274 case PIX_FMT_UYVY422:
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275 pixel_size=2;
276 break;
277 case PIX_FMT_RGB24:
278 case PIX_FMT_BGR24:
279 pixel_size=3;
280 break;
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281 case PIX_FMT_RGBA32:
282 pixel_size=4;
283 break;
284 default:
285 pixel_size=1;
286 }
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287
288 avcodec_align_dimensions(s, &w, &h);
f0bbfc4a 289
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290 if(!(s->flags&CODEC_FLAG_EMU_EDGE)){
291 w+= EDGE_WIDTH*2;
292 h+= EDGE_WIDTH*2;
293 }
294
d90cf87b 295 buf->last_pic_num= -256*256*256*64;
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296
297 for(i=0; i<3; i++){
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298 const int h_shift= i==0 ? 0 : h_chroma_shift;
299 const int v_shift= i==0 ? 0 : v_chroma_shift;
1e491e29 300
7984082a 301 //FIXME next ensures that linesize= 2^x uvlinesize, thats needed because some MC code assumes it
3237f731 302 buf->linesize[i]= ALIGN(pixel_size*w>>h_shift, STRIDE_ALIGN<<(h_chroma_shift-h_shift));
1e491e29 303
237e4938 304 buf->base[i]= av_mallocz((buf->linesize[i]*h>>v_shift)+16); //FIXME 16
d90cf87b 305 if(buf->base[i]==NULL) return -1;
237e4938 306 memset(buf->base[i], 128, buf->linesize[i]*h>>v_shift);
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307
308 if(s->flags&CODEC_FLAG_EMU_EDGE)
d90cf87b 309 buf->data[i] = buf->base[i];
1e491e29 310 else
3237f731 311 buf->data[i] = buf->base[i] + ALIGN((buf->linesize[i]*EDGE_WIDTH>>v_shift) + (EDGE_WIDTH>>h_shift), STRIDE_ALIGN);
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312 }
313 pic->age= 256*256*256*64;
314 }
237e4938 315 pic->type= FF_BUFFER_TYPE_INTERNAL;
1e491e29 316
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317 for(i=0; i<4; i++){
318 pic->base[i]= buf->base[i];
319 pic->data[i]= buf->data[i];
237e4938 320 pic->linesize[i]= buf->linesize[i];
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321 }
322 s->internal_buffer_count++;
323
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324 return 0;
325}
326
492cd3a9 327void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic){
1e491e29 328 int i;
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329 InternalBuffer *buf, *last, temp;
330
4e00e76b 331 assert(pic->type==FF_BUFFER_TYPE_INTERNAL);
59c673d5 332 assert(s->internal_buffer_count);
d90cf87b 333
b1609412 334 buf = NULL; /* avoids warning */
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335 for(i=0; i<s->internal_buffer_count; i++){ //just 3-5 checks so is not worth to optimize
336 buf= &((InternalBuffer*)s->internal_buffer)[i];
337 if(buf->data[0] == pic->data[0])
338 break;
339 }
340 assert(i < s->internal_buffer_count);
341 s->internal_buffer_count--;
342 last = &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
343
344 temp= *buf;
345 *buf= *last;
346 *last= temp;
347
348 for(i=0; i<3; i++){
1e491e29 349 pic->data[i]=NULL;
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350// pic->base[i]=NULL;
351 }
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352//printf("R%X\n", pic->opaque);
353}
354
e1c2a5a0
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355int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic){
356 AVFrame temp_pic;
357 int i;
358
359 /* If no picture return a new buffer */
360 if(pic->data[0] == NULL) {
361 /* We will copy from buffer, so must be readable */
362 pic->buffer_hints |= FF_BUFFER_HINTS_READABLE;
363 return s->get_buffer(s, pic);
364 }
365
366 /* If internal buffer type return the same buffer */
367 if(pic->type == FF_BUFFER_TYPE_INTERNAL)
368 return 0;
369
370 /*
371 * Not internal type and reget_buffer not overridden, emulate cr buffer
372 */
373 temp_pic = *pic;
374 for(i = 0; i < 4; i++)
375 pic->data[i] = pic->base[i] = NULL;
376 pic->opaque = NULL;
377 /* Allocate new frame */
378 if (s->get_buffer(s, pic))
379 return -1;
380 /* Copy image data from old buffer to new buffer */
381 img_copy((AVPicture*)pic, (AVPicture*)&temp_pic, s->pix_fmt, s->width,
382 s->height);
383 s->release_buffer(s, &temp_pic); // Release old frame
384 return 0;
385}
386
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387int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void **arg, int *ret, int count){
388 int i;
389
390 for(i=0; i<count; i++){
391 int r= func(c, arg[i]);
392 if(ret) ret[i]= r;
393 }
394 return 0;
395}
396
494c56d3 397enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat * fmt){
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398 return fmt[0];
399}
400
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401static const char* context_to_name(void* ptr) {
402 AVCodecContext *avc= ptr;
403
404 if(avc && avc->codec && avc->codec->name)
405 return avc->codec->name;
406 else
407 return "NULL";
408}
409
410static AVClass av_codec_context_class = { "AVCodecContext", context_to_name };
411
a949d72e 412void avcodec_get_context_defaults(AVCodecContext *s){
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413 memset(s, 0, sizeof(AVCodecContext));
414
43465395 415 s->av_class= &av_codec_context_class;
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416 s->bit_rate= 800*1000;
417 s->bit_rate_tolerance= s->bit_rate*10;
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418 s->qmin= 2;
419 s->qmax= 31;
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420 s->mb_qmin= 2;
421 s->mb_qmax= 31;
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422 s->rc_eq= "tex^qComp";
423 s->qcompress= 0.5;
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424 s->max_qdiff= 3;
425 s->b_quant_factor=1.25;
426 s->b_quant_offset=1.25;
b3a391e8 427 s->i_quant_factor=-0.8;
e8b62df6 428 s->i_quant_offset=0.0;
4d2858de 429 s->error_concealment= 3;
8d0e42ca 430 s->error_resilience= 1;
4d2858de 431 s->workaround_bugs= FF_BUG_AUTODETECT;
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432 s->frame_rate_base= 1;
433 s->frame_rate = 25;
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434 s->gop_size= 50;
435 s->me_method= ME_EPZS;
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436 s->get_buffer= avcodec_default_get_buffer;
437 s->release_buffer= avcodec_default_release_buffer;
a33c7159 438 s->get_format= avcodec_default_get_format;
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439 s->execute= avcodec_default_execute;
440 s->thread_count=1;
826f429a 441 s->me_subpel_quality=8;
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442 s->lmin= FF_QP2LAMBDA * s->qmin;
443 s->lmax= FF_QP2LAMBDA * s->qmax;
5ff85f1d 444 s->sample_aspect_ratio= (AVRational){0,1};
620fe604 445 s->ildct_cmp= FF_CMP_VSAD;
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446 s->profile= FF_PROFILE_UNKNOWN;
447 s->level= FF_LEVEL_UNKNOWN;
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448
449 s->intra_quant_bias= FF_DEFAULT_QUANT_BIAS;
450 s->inter_quant_bias= FF_DEFAULT_QUANT_BIAS;
2a2bbcb0 451 s->palctrl = NULL;
e1c2a5a0 452 s->reget_buffer= avcodec_default_reget_buffer;
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453}
454
455/**
456 * allocates a AVCodecContext and set it to defaults.
457 * this can be deallocated by simply calling free()
458 */
7ffbb60e 459AVCodecContext *avcodec_alloc_context(void){
9740beff 460 AVCodecContext *avctx= av_malloc(sizeof(AVCodecContext));
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461
462 if(avctx==NULL) return NULL;
463
464 avcodec_get_context_defaults(avctx);
465
466 return avctx;
467}
468
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469void avcodec_get_frame_defaults(AVFrame *pic){
470 memset(pic, 0, sizeof(AVFrame));
471
472 pic->pts= AV_NOPTS_VALUE;
473}
474
1e491e29 475/**
492cd3a9 476 * allocates a AVPFrame and set it to defaults.
1e491e29
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477 * this can be deallocated by simply calling free()
478 */
492cd3a9 479AVFrame *avcodec_alloc_frame(void){
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480 AVFrame *pic= av_malloc(sizeof(AVFrame));
481
482 if(pic==NULL) return NULL;
483
484 avcodec_get_frame_defaults(pic);
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485
486 return pic;
487}
488
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489int avcodec_open(AVCodecContext *avctx, AVCodec *codec)
490{
491 int ret;
492
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493 if(avctx->codec)
494 return -1;
495
de6d9b64 496 avctx->codec = codec;
4cb3ca72 497 avctx->codec_id = codec->id;
de6d9b64 498 avctx->frame_number = 0;
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PG
499 if (codec->priv_data_size > 0) {
500 avctx->priv_data = av_mallocz(codec->priv_data_size);
501 if (!avctx->priv_data)
502 return -ENOMEM;
503 } else {
504 avctx->priv_data = NULL;
505 }
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506
507 if(avctx->coded_width && avctx->coded_height)
508 avcodec_set_dimensions(avctx, avctx->coded_width, avctx->coded_height);
509 else if(avctx->width && avctx->height)
510 avcodec_set_dimensions(avctx, avctx->width, avctx->height);
511
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512 ret = avctx->codec->init(avctx);
513 if (ret < 0) {
3123dd79 514 av_freep(&avctx->priv_data);
de6d9b64
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515 return ret;
516 }
517 return 0;
518}
519
0c1a9eda 520int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size,
de6d9b64
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521 const short *samples)
522{
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523 if((avctx->codec->capabilities & CODEC_CAP_DELAY) || samples){
524 int ret = avctx->codec->encode(avctx, buf, buf_size, (void *)samples);
525 avctx->frame_number++;
526 return ret;
527 }else
528 return 0;
de6d9b64
FB
529}
530
0c1a9eda 531int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
492cd3a9 532 const AVFrame *pict)
de6d9b64 533{
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534 if((avctx->codec->capabilities & CODEC_CAP_DELAY) || pict){
535 int ret = avctx->codec->encode(avctx, buf, buf_size, (void *)pict);
536 avctx->frame_number++;
537 emms_c(); //needed to avoid a emms_c() call before every return;
6bb925f4 538
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539 return ret;
540 }else
541 return 0;
de6d9b64
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542}
543
f138f883
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544/**
545 * decode a frame.
546 * @param buf bitstream buffer, must be FF_INPUT_BUFFER_PADDING_SIZE larger then the actual read bytes
547 * because some optimized bitstream readers read 32 or 64 bit at once and could read over the end
548 * @param buf_size the size of the buffer in bytes
549 * @param got_picture_ptr zero if no frame could be decompressed, Otherwise, it is non zero
550 * @return -1 if error, otherwise return the number of
551 * bytes used.
552 */
492cd3a9 553int avcodec_decode_video(AVCodecContext *avctx, AVFrame *picture,
de6d9b64 554 int *got_picture_ptr,
0c1a9eda 555 uint8_t *buf, int buf_size)
de6d9b64
FB
556{
557 int ret;
1e491e29 558
53db1cae 559 *got_picture_ptr= 0;
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560 ret = avctx->codec->decode(avctx, picture, got_picture_ptr,
561 buf, buf_size);
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562
563 emms_c(); //needed to avoid a emms_c() call before every return;
1e491e29 564
1cb0edb4
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565 if (*got_picture_ptr)
566 avctx->frame_number++;
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567 return ret;
568}
569
570/* decode an audio frame. return -1 if error, otherwise return the
571 *number of bytes used. If no frame could be decompressed,
572 *frame_size_ptr is zero. Otherwise, it is the decompressed frame
573 *size in BYTES. */
0c1a9eda 574int avcodec_decode_audio(AVCodecContext *avctx, int16_t *samples,
de6d9b64 575 int *frame_size_ptr,
0c1a9eda 576 uint8_t *buf, int buf_size)
de6d9b64
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577{
578 int ret;
579
53db1cae 580 *frame_size_ptr= 0;
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581 ret = avctx->codec->decode(avctx, samples, frame_size_ptr,
582 buf, buf_size);
583 avctx->frame_number++;
584 return ret;
585}
586
587int avcodec_close(AVCodecContext *avctx)
588{
589 if (avctx->codec->close)
590 avctx->codec->close(avctx);
eea8c08f 591 avcodec_default_free_buffers(avctx);
3123dd79 592 av_freep(&avctx->priv_data);
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593 avctx->codec = NULL;
594 return 0;
595}
596
597AVCodec *avcodec_find_encoder(enum CodecID id)
598{
599 AVCodec *p;
600 p = first_avcodec;
601 while (p) {
602 if (p->encode != NULL && p->id == id)
603 return p;
604 p = p->next;
605 }
606 return NULL;
607}
608
98f3b098
A
609AVCodec *avcodec_find_encoder_by_name(const char *name)
610{
611 AVCodec *p;
612 p = first_avcodec;
613 while (p) {
614 if (p->encode != NULL && strcmp(name,p->name) == 0)
615 return p;
616 p = p->next;
617 }
618 return NULL;
619}
620
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621AVCodec *avcodec_find_decoder(enum CodecID id)
622{
623 AVCodec *p;
624 p = first_avcodec;
625 while (p) {
626 if (p->decode != NULL && p->id == id)
627 return p;
628 p = p->next;
629 }
630 return NULL;
631}
632
633AVCodec *avcodec_find_decoder_by_name(const char *name)
634{
635 AVCodec *p;
636 p = first_avcodec;
637 while (p) {
638 if (p->decode != NULL && strcmp(name,p->name) == 0)
639 return p;
640 p = p->next;
641 }
642 return NULL;
643}
644
50071f0b 645static AVCodec *avcodec_find(enum CodecID id)
de6d9b64
FB
646{
647 AVCodec *p;
648 p = first_avcodec;
649 while (p) {
650 if (p->id == id)
651 return p;
652 p = p->next;
653 }
654 return NULL;
655}
656
657void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)
658{
659 const char *codec_name;
660 AVCodec *p;
661 char buf1[32];
623563c0 662 char channels_str[100];
a96b68b7 663 int bitrate;
de6d9b64
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664
665 if (encode)
666 p = avcodec_find_encoder(enc->codec_id);
667 else
668 p = avcodec_find_decoder(enc->codec_id);
669
670 if (p) {
671 codec_name = p->name;
98ce5991
FB
672 if (!encode && enc->codec_id == CODEC_ID_MP3) {
673 if (enc->sub_id == 2)
674 codec_name = "mp2";
675 else if (enc->sub_id == 1)
676 codec_name = "mp1";
677 }
985180a1
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678 } else if (enc->codec_id == CODEC_ID_MPEG2TS) {
679 /* fake mpeg2 transport stream codec (currently not
680 registered) */
681 codec_name = "mpeg2ts";
de6d9b64
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682 } else if (enc->codec_name[0] != '\0') {
683 codec_name = enc->codec_name;
684 } else {
685 /* output avi tags */
686 if (enc->codec_type == CODEC_TYPE_VIDEO) {
687 snprintf(buf1, sizeof(buf1), "%c%c%c%c",
688 enc->codec_tag & 0xff,
689 (enc->codec_tag >> 8) & 0xff,
690 (enc->codec_tag >> 16) & 0xff,
691 (enc->codec_tag >> 24) & 0xff);
692 } else {
693 snprintf(buf1, sizeof(buf1), "0x%04x", enc->codec_tag);
694 }
695 codec_name = buf1;
696 }
697
698 switch(enc->codec_type) {
699 case CODEC_TYPE_VIDEO:
700 snprintf(buf, buf_size,
701 "Video: %s%s",
7d1c3fc1 702 codec_name, enc->mb_decision ? " (hq)" : "");
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703 if (enc->codec_id == CODEC_ID_RAWVIDEO) {
704 snprintf(buf + strlen(buf), buf_size - strlen(buf),
705 ", %s",
9bbffbb1 706 avcodec_get_pix_fmt_name(enc->pix_fmt));
cf087595 707 }
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708 if (enc->width) {
709 snprintf(buf + strlen(buf), buf_size - strlen(buf),
710 ", %dx%d, %0.2f fps",
711 enc->width, enc->height,
14bea432 712 (float)enc->frame_rate / enc->frame_rate_base);
de6d9b64 713 }
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714 if (encode) {
715 snprintf(buf + strlen(buf), buf_size - strlen(buf),
716 ", q=%d-%d", enc->qmin, enc->qmax);
717 }
a96b68b7 718 bitrate = enc->bit_rate;
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719 break;
720 case CODEC_TYPE_AUDIO:
721 snprintf(buf, buf_size,
722 "Audio: %s",
723 codec_name);
e0d2714a
J
724 switch (enc->channels) {
725 case 1:
623563c0 726 strcpy(channels_str, "mono");
e0d2714a
J
727 break;
728 case 2:
623563c0 729 strcpy(channels_str, "stereo");
e0d2714a
J
730 break;
731 case 6:
623563c0 732 strcpy(channels_str, "5:1");
e0d2714a
J
733 break;
734 default:
735 sprintf(channels_str, "%d channels", enc->channels);
736 break;
737 }
de6d9b64
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738 if (enc->sample_rate) {
739 snprintf(buf + strlen(buf), buf_size - strlen(buf),
740 ", %d Hz, %s",
741 enc->sample_rate,
e0d2714a 742 channels_str);
de6d9b64 743 }
e0d2714a 744
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745 /* for PCM codecs, compute bitrate directly */
746 switch(enc->codec_id) {
747 case CODEC_ID_PCM_S16LE:
748 case CODEC_ID_PCM_S16BE:
749 case CODEC_ID_PCM_U16LE:
750 case CODEC_ID_PCM_U16BE:
a190b7e9 751 bitrate = enc->sample_rate * enc->channels * 16;
a96b68b7
FB
752 break;
753 case CODEC_ID_PCM_S8:
754 case CODEC_ID_PCM_U8:
755 case CODEC_ID_PCM_ALAW:
756 case CODEC_ID_PCM_MULAW:
a190b7e9 757 bitrate = enc->sample_rate * enc->channels * 8;
a96b68b7
FB
758 break;
759 default:
760 bitrate = enc->bit_rate;
761 break;
762 }
de6d9b64 763 break;
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FB
764 case CODEC_TYPE_DATA:
765 snprintf(buf, buf_size, "Data: %s", codec_name);
766 bitrate = enc->bit_rate;
767 break;
de6d9b64 768 default:
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769 snprintf(buf, buf_size, "Invalid Codec type %d", enc->codec_type);
770 return;
de6d9b64 771 }
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772 if (encode) {
773 if (enc->flags & CODEC_FLAG_PASS1)
774 snprintf(buf + strlen(buf), buf_size - strlen(buf),
775 ", pass 1");
776 if (enc->flags & CODEC_FLAG_PASS2)
777 snprintf(buf + strlen(buf), buf_size - strlen(buf),
778 ", pass 2");
779 }
a96b68b7 780 if (bitrate != 0) {
de6d9b64 781 snprintf(buf + strlen(buf), buf_size - strlen(buf),
a96b68b7 782 ", %d kb/s", bitrate / 1000);
de6d9b64
FB
783 }
784}
785
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786unsigned avcodec_version( void )
787{
788 return LIBAVCODEC_VERSION_INT;
789}
cf087595 790
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791unsigned avcodec_build( void )
792{
793 return LIBAVCODEC_BUILD;
794}
795
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796/* must be called before any other functions */
797void avcodec_init(void)
798{
0344cd0a
AB
799 static int inited = 0;
800
801 if (inited != 0)
802 return;
803 inited = 1;
804
59cf08ce 805 dsputil_static_init();
de6d9b64
FB
806}
807
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808/**
809 * Flush buffers, should be called when seeking or when swicthing to a different stream.
810 */
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811void avcodec_flush_buffers(AVCodecContext *avctx)
812{
7a06ff14
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813 if(avctx->codec->flush)
814 avctx->codec->flush(avctx);
1c2a8c7f
MN
815}
816
b100eab8 817void avcodec_default_free_buffers(AVCodecContext *s){
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818 int i, j;
819
820 if(s->internal_buffer==NULL) return;
821
822 for(i=0; i<INTERNAL_BUFFER_SIZE; i++){
823 InternalBuffer *buf= &((InternalBuffer*)s->internal_buffer)[i];
824 for(j=0; j<4; j++){
825 av_freep(&buf->base[j]);
826 buf->data[j]= NULL;
827 }
828 }
829 av_freep(&s->internal_buffer);
830
831 s->internal_buffer_count=0;
832}
833
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834char av_get_pict_type_char(int pict_type){
835 switch(pict_type){
836 case I_TYPE: return 'I';
837 case P_TYPE: return 'P';
838 case B_TYPE: return 'B';
839 case S_TYPE: return 'S';
840 case SI_TYPE:return 'i';
841 case SP_TYPE:return 'p';
842 default: return '?';
843 }
844}
845
14bea432 846int av_reduce(int *dst_nom, int *dst_den, int64_t nom, int64_t den, int64_t max){
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847 AVRational a0={0,1}, a1={1,0};
848 int sign= (nom<0) ^ (den<0);
849 int64_t gcd= ff_gcd(ABS(nom), ABS(den));
850
851 nom = ABS(nom)/gcd;
852 den = ABS(den)/gcd;
853 if(nom<=max && den<=max){
854 a1= (AVRational){nom, den};
855 den=0;
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856 }
857
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858 while(den){
859 int64_t x = nom / den;
860 int64_t next_den= nom - den*x;
861 int64_t a2n= x*a1.num + a0.num;
862 int64_t a2d= x*a1.den + a0.den;
863
864 if(a2n > max || a2d > max) break;
865
866 a0= a1;
867 a1= (AVRational){a2n, a2d};
868 nom= den;
869 den= next_den;
870 }
871 assert(ff_gcd(a1.num, a1.den) == 1);
5ed9f2e5 872
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873 *dst_nom = sign ? -a1.num : a1.num;
874 *dst_den = a1.den;
14bea432 875
5f63d108 876 return den==0;
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877}
878
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879int64_t av_rescale_rnd(int64_t a, int64_t b, int64_t c, enum AVRounding rnd){
880 AVInteger ai;
881 int64_t r=0;
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882 assert(c > 0);
883 assert(b >=0);
1f018225 884 assert(rnd >=0 && rnd<=5 && rnd!=4);
14bea432 885
15862411 886 if(a<0 && a != INT64_MIN) return -av_rescale_rnd(-a, b, c, rnd ^ ((rnd>>1)&1));
14bea432 887
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888 if(rnd==AV_ROUND_NEAR_INF) r= c/2;
889 else if(rnd&1) r= c-1;
890
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MN
891 if(b<=INT_MAX && c<=INT_MAX){
892 if(a<=INT_MAX)
1f018225 893 return (a * b + r)/c;
4c263142 894 else
1f018225 895 return a/c*b + (a%c*b + r)/c;
4c263142 896 }
14bea432 897
4c263142 898 ai= av_mul_i(av_int2i(a), av_int2i(b));
1f018225 899 ai= av_add_i(ai, av_int2i(r));
4c263142 900
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901 return av_i2int(av_div_i(ai, av_int2i(c)));
902}
903
904int64_t av_rescale(int64_t a, int64_t b, int64_t c){
905 return av_rescale_rnd(a, b, c, AV_ROUND_NEAR_INF);
14bea432 906}
9b879566 907
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908int64_t ff_gcd(int64_t a, int64_t b){
909 if(b) return ff_gcd(b, a%b);
910 else return a;
911}
912
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913/* av_log API */
914
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915static int av_log_level = AV_LOG_DEBUG;
916
bc874dae 917static void av_log_default_callback(void* ptr, int level, const char* fmt, va_list vl)
9b879566 918{
89b9441a 919 static int print_prefix=1;
43465395 920 AVClass* avc= ptr ? *(AVClass**)ptr : NULL;
9b879566 921 if(level>av_log_level)
bc874dae 922 return;
d705e4a6 923#undef fprintf
43465395
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924 if(print_prefix && avc) {
925 fprintf(stderr, "[%s @ %p]", avc->item_name(ptr), avc);
bc874dae 926 }
d705e4a6 927#define fprintf please_use_av_log
89b9441a 928
95ba2c8f 929 print_prefix= strstr(fmt, "\n") != NULL;
89b9441a 930
9b879566
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931 vfprintf(stderr, fmt, vl);
932}
933
bc874dae 934static void (*av_log_callback)(void*, int, const char*, va_list) = av_log_default_callback;
9b879566 935
bc874dae 936void av_log(void* avcl, int level, const char *fmt, ...)
9b879566
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937{
938 va_list vl;
939 va_start(vl, fmt);
bc874dae 940 av_vlog(avcl, level, fmt, vl);
9b879566
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941 va_end(vl);
942}
943
bc874dae 944void av_vlog(void* avcl, int level, const char *fmt, va_list vl)
9b879566 945{
bc874dae 946 av_log_callback(avcl, level, fmt, vl);
9b879566
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947}
948
949int av_log_get_level(void)
950{
951 return av_log_level;
952}
953
954void av_log_set_level(int level)
955{
956 av_log_level = level;
957}
958
bc874dae 959void av_log_set_callback(void (*callback)(void*, int, const char*, va_list))
9b879566
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960{
961 av_log_callback = callback;
962}
963
2450cff2 964#if !defined(HAVE_THREADS)
ca8ad847
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965int avcodec_thread_init(AVCodecContext *s, int thread_count){
966 return -1;
967}
968#endif