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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
0ecca7a4 85 *size= FFMAX(17*min_size/16 + 32, min_size);
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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));
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104 if(!array_static)
105 return NULL;
8d1f2ba5 106 array_static[last_static++] = ptr;
855ea723 107 }
8d1f2ba5 108
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109 return ptr;
110}
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111
112/**
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113 * same as above, but does realloc
114 */
115
116void *av_realloc_static(void *ptr, unsigned int size)
117{
118 int i;
119 if(!ptr)
120 return av_mallocz_static(size);
121 /* Look for the old ptr */
122 for(i = 0; i < last_static; i++) {
123 if(array_static[i] == ptr) {
124 array_static[i] = av_realloc(array_static[i], size);
125 return array_static[i];
126 }
127 }
128 return NULL;
129
130}
131
132/**
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133 * free all static arrays and reset pointers to 0.
134 */
4cfbf61b 135void av_free_static(void)
855ea723 136{
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137 while(last_static){
138 av_freep(&array_static[--last_static]);
855ea723 139 }
8d1f2ba5 140 av_freep(&array_static);
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141}
142
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143/**
144 * Frees memory and sets the pointer to NULL.
145 * @param arg pointer to the pointer which should be freed
146 */
147void av_freep(void *arg)
4d7a0a05 148{
81c5f887 149 void **ptr= (void**)arg;
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150 av_free(*ptr);
151 *ptr = NULL;
152}
153
de6d9b64 154/* encoder management */
8b69867f 155AVCodec *first_avcodec = NULL;
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156
157void register_avcodec(AVCodec *format)
158{
159 AVCodec **p;
160 p = &first_avcodec;
161 while (*p != NULL) p = &(*p)->next;
162 *p = format;
163 format->next = NULL;
164}
165
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166void avcodec_set_dimensions(AVCodecContext *s, int width, int height){
167 s->coded_width = width;
168 s->coded_height= height;
169 s->width = -((-width )>>s->lowres);
170 s->height= -((-height)>>s->lowres);
171}
172
d90cf87b 173typedef struct InternalBuffer{
1e491e29 174 int last_pic_num;
d90cf87b 175 uint8_t *base[4];
1e491e29 176 uint8_t *data[4];
237e4938 177 int linesize[4];
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178}InternalBuffer;
179
180#define INTERNAL_BUFFER_SIZE 32
1e491e29 181
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182#define ALIGN(x, a) (((x)+(a)-1)&~((a)-1))
183
184void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height){
185 int w_align= 1;
186 int h_align= 1;
187
188 switch(s->pix_fmt){
189 case PIX_FMT_YUV420P:
190 case PIX_FMT_YUV422:
ebb177dd 191 case PIX_FMT_UYVY422:
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192 case PIX_FMT_YUV422P:
193 case PIX_FMT_YUV444P:
194 case PIX_FMT_GRAY8:
195 case PIX_FMT_YUVJ420P:
196 case PIX_FMT_YUVJ422P:
197 case PIX_FMT_YUVJ444P:
198 w_align= 16; //FIXME check for non mpeg style codecs and use less alignment
199 h_align= 16;
200 break;
201 case PIX_FMT_YUV411P:
f02be79d 202 case PIX_FMT_UYVY411:
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203 w_align=32;
204 h_align=8;
205 break;
206 case PIX_FMT_YUV410P:
207 if(s->codec_id == CODEC_ID_SVQ1){
208 w_align=64;
209 h_align=64;
210 }
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211 case PIX_FMT_RGB555:
212 if(s->codec_id == CODEC_ID_RPZA){
213 w_align=4;
214 h_align=4;
215 }
216 case PIX_FMT_PAL8:
217 if(s->codec_id == CODEC_ID_SMC){
218 w_align=4;
219 h_align=4;
220 }
f0bbfc4a 221 break;
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222 case PIX_FMT_BGR24:
223 if((s->codec_id == CODEC_ID_MSZH) || (s->codec_id == CODEC_ID_ZLIB)){
224 w_align=4;
225 h_align=4;
226 }
227 break;
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228 default:
229 w_align= 1;
230 h_align= 1;
231 break;
232 }
233
234 *width = ALIGN(*width , w_align);
235 *height= ALIGN(*height, h_align);
236}
237
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238int avcodec_check_dimensions(void *av_log_ctx, unsigned int w, unsigned int h){
239 if((int)w>0 && (int)h>0 && (w+128)*(uint64_t)(h+128) < INT_MAX/4)
240 return 0;
241
242 av_log(av_log_ctx, AV_LOG_ERROR, "picture size invalid (%ux%u)\n", w, h);
243 return -1;
244}
245
492cd3a9 246int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic){
1e491e29 247 int i;
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248 int w= s->width;
249 int h= s->height;
d90cf87b 250 InternalBuffer *buf;
237e4938 251 int *picture_number;
0ecca7a4 252
4e00e76b 253 assert(pic->data[0]==NULL);
d90cf87b 254 assert(INTERNAL_BUFFER_SIZE > s->internal_buffer_count);
1e491e29 255
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256 if(avcodec_check_dimensions(s,w,h))
257 return -1;
258
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259 if(s->internal_buffer==NULL){
260 s->internal_buffer= av_mallocz(INTERNAL_BUFFER_SIZE*sizeof(InternalBuffer));
261 }
262#if 0
263 s->internal_buffer= av_fast_realloc(
264 s->internal_buffer,
265 &s->internal_buffer_size,
266 sizeof(InternalBuffer)*FFMAX(99, s->internal_buffer_count+1)/*FIXME*/
267 );
268#endif
269
270 buf= &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
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271 picture_number= &(((InternalBuffer*)s->internal_buffer)[INTERNAL_BUFFER_SIZE-1]).last_pic_num; //FIXME ugly hack
272 (*picture_number)++;
273
d90cf87b 274 if(buf->base[0]){
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275 pic->age= *picture_number - buf->last_pic_num;
276 buf->last_pic_num= *picture_number;
1e491e29 277 }else{
f0bbfc4a 278 int h_chroma_shift, v_chroma_shift;
3237f731 279 int pixel_size;
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280
281 avcodec_get_chroma_sub_sample(s->pix_fmt, &h_chroma_shift, &v_chroma_shift);
f0bbfc4a 282
1e491e29 283 switch(s->pix_fmt){
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284 case PIX_FMT_RGB555:
285 case PIX_FMT_RGB565:
1e491e29 286 case PIX_FMT_YUV422:
ebb177dd 287 case PIX_FMT_UYVY422:
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288 pixel_size=2;
289 break;
290 case PIX_FMT_RGB24:
291 case PIX_FMT_BGR24:
292 pixel_size=3;
293 break;
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294 case PIX_FMT_RGBA32:
295 pixel_size=4;
296 break;
297 default:
298 pixel_size=1;
299 }
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300
301 avcodec_align_dimensions(s, &w, &h);
f0bbfc4a 302
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303 if(!(s->flags&CODEC_FLAG_EMU_EDGE)){
304 w+= EDGE_WIDTH*2;
305 h+= EDGE_WIDTH*2;
306 }
307
d90cf87b 308 buf->last_pic_num= -256*256*256*64;
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309
310 for(i=0; i<3; i++){
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311 const int h_shift= i==0 ? 0 : h_chroma_shift;
312 const int v_shift= i==0 ? 0 : v_chroma_shift;
1e491e29 313
7984082a 314 //FIXME next ensures that linesize= 2^x uvlinesize, thats needed because some MC code assumes it
3237f731 315 buf->linesize[i]= ALIGN(pixel_size*w>>h_shift, STRIDE_ALIGN<<(h_chroma_shift-h_shift));
1e491e29 316
f41c1fac 317 buf->base[i]= av_malloc((buf->linesize[i]*h>>v_shift)+16); //FIXME 16
d90cf87b 318 if(buf->base[i]==NULL) return -1;
237e4938 319 memset(buf->base[i], 128, buf->linesize[i]*h>>v_shift);
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320
321 if(s->flags&CODEC_FLAG_EMU_EDGE)
d90cf87b 322 buf->data[i] = buf->base[i];
1e491e29 323 else
3237f731 324 buf->data[i] = buf->base[i] + ALIGN((buf->linesize[i]*EDGE_WIDTH>>v_shift) + (EDGE_WIDTH>>h_shift), STRIDE_ALIGN);
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325 }
326 pic->age= 256*256*256*64;
327 }
237e4938 328 pic->type= FF_BUFFER_TYPE_INTERNAL;
1e491e29 329
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330 for(i=0; i<4; i++){
331 pic->base[i]= buf->base[i];
332 pic->data[i]= buf->data[i];
237e4938 333 pic->linesize[i]= buf->linesize[i];
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334 }
335 s->internal_buffer_count++;
336
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337 return 0;
338}
339
492cd3a9 340void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic){
1e491e29 341 int i;
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342 InternalBuffer *buf, *last, temp;
343
4e00e76b 344 assert(pic->type==FF_BUFFER_TYPE_INTERNAL);
59c673d5 345 assert(s->internal_buffer_count);
d90cf87b 346
b1609412 347 buf = NULL; /* avoids warning */
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348 for(i=0; i<s->internal_buffer_count; i++){ //just 3-5 checks so is not worth to optimize
349 buf= &((InternalBuffer*)s->internal_buffer)[i];
350 if(buf->data[0] == pic->data[0])
351 break;
352 }
353 assert(i < s->internal_buffer_count);
354 s->internal_buffer_count--;
355 last = &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
356
357 temp= *buf;
358 *buf= *last;
359 *last= temp;
360
361 for(i=0; i<3; i++){
1e491e29 362 pic->data[i]=NULL;
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363// pic->base[i]=NULL;
364 }
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365//printf("R%X\n", pic->opaque);
366}
367
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368int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic){
369 AVFrame temp_pic;
370 int i;
371
372 /* If no picture return a new buffer */
373 if(pic->data[0] == NULL) {
374 /* We will copy from buffer, so must be readable */
375 pic->buffer_hints |= FF_BUFFER_HINTS_READABLE;
376 return s->get_buffer(s, pic);
377 }
378
379 /* If internal buffer type return the same buffer */
380 if(pic->type == FF_BUFFER_TYPE_INTERNAL)
381 return 0;
382
383 /*
384 * Not internal type and reget_buffer not overridden, emulate cr buffer
385 */
386 temp_pic = *pic;
387 for(i = 0; i < 4; i++)
388 pic->data[i] = pic->base[i] = NULL;
389 pic->opaque = NULL;
390 /* Allocate new frame */
391 if (s->get_buffer(s, pic))
392 return -1;
393 /* Copy image data from old buffer to new buffer */
394 img_copy((AVPicture*)pic, (AVPicture*)&temp_pic, s->pix_fmt, s->width,
395 s->height);
396 s->release_buffer(s, &temp_pic); // Release old frame
397 return 0;
398}
399
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400int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void **arg, int *ret, int count){
401 int i;
402
403 for(i=0; i<count; i++){
404 int r= func(c, arg[i]);
405 if(ret) ret[i]= r;
406 }
407 return 0;
408}
409
494c56d3 410enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat * fmt){
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411 return fmt[0];
412}
413
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414static const char* context_to_name(void* ptr) {
415 AVCodecContext *avc= ptr;
416
417 if(avc && avc->codec && avc->codec->name)
418 return avc->codec->name;
419 else
420 return "NULL";
421}
422
423static AVClass av_codec_context_class = { "AVCodecContext", context_to_name };
424
a949d72e 425void avcodec_get_context_defaults(AVCodecContext *s){
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426 memset(s, 0, sizeof(AVCodecContext));
427
43465395 428 s->av_class= &av_codec_context_class;
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429 s->bit_rate= 800*1000;
430 s->bit_rate_tolerance= s->bit_rate*10;
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431 s->qmin= 2;
432 s->qmax= 31;
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433 s->mb_qmin= 2;
434 s->mb_qmax= 31;
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435 s->rc_eq= "tex^qComp";
436 s->qcompress= 0.5;
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437 s->max_qdiff= 3;
438 s->b_quant_factor=1.25;
439 s->b_quant_offset=1.25;
b3a391e8 440 s->i_quant_factor=-0.8;
e8b62df6 441 s->i_quant_offset=0.0;
4d2858de 442 s->error_concealment= 3;
8d0e42ca 443 s->error_resilience= 1;
4d2858de 444 s->workaround_bugs= FF_BUG_AUTODETECT;
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445 s->frame_rate_base= 1;
446 s->frame_rate = 25;
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447 s->gop_size= 50;
448 s->me_method= ME_EPZS;
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449 s->get_buffer= avcodec_default_get_buffer;
450 s->release_buffer= avcodec_default_release_buffer;
a33c7159 451 s->get_format= avcodec_default_get_format;
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452 s->execute= avcodec_default_execute;
453 s->thread_count=1;
826f429a 454 s->me_subpel_quality=8;
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455 s->lmin= FF_QP2LAMBDA * s->qmin;
456 s->lmax= FF_QP2LAMBDA * s->qmax;
5ff85f1d 457 s->sample_aspect_ratio= (AVRational){0,1};
620fe604 458 s->ildct_cmp= FF_CMP_VSAD;
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459 s->profile= FF_PROFILE_UNKNOWN;
460 s->level= FF_LEVEL_UNKNOWN;
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461
462 s->intra_quant_bias= FF_DEFAULT_QUANT_BIAS;
463 s->inter_quant_bias= FF_DEFAULT_QUANT_BIAS;
2a2bbcb0 464 s->palctrl = NULL;
e1c2a5a0 465 s->reget_buffer= avcodec_default_reget_buffer;
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466}
467
468/**
469 * allocates a AVCodecContext and set it to defaults.
470 * this can be deallocated by simply calling free()
471 */
7ffbb60e 472AVCodecContext *avcodec_alloc_context(void){
9740beff 473 AVCodecContext *avctx= av_malloc(sizeof(AVCodecContext));
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474
475 if(avctx==NULL) return NULL;
476
477 avcodec_get_context_defaults(avctx);
478
479 return avctx;
480}
481
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482void avcodec_get_frame_defaults(AVFrame *pic){
483 memset(pic, 0, sizeof(AVFrame));
484
485 pic->pts= AV_NOPTS_VALUE;
486}
487
1e491e29 488/**
492cd3a9 489 * allocates a AVPFrame and set it to defaults.
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490 * this can be deallocated by simply calling free()
491 */
492cd3a9 492AVFrame *avcodec_alloc_frame(void){
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493 AVFrame *pic= av_malloc(sizeof(AVFrame));
494
495 if(pic==NULL) return NULL;
496
497 avcodec_get_frame_defaults(pic);
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498
499 return pic;
500}
501
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502int avcodec_open(AVCodecContext *avctx, AVCodec *codec)
503{
504 int ret;
505
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506 if(avctx->codec)
507 return -1;
508
de6d9b64 509 avctx->codec = codec;
4cb3ca72 510 avctx->codec_id = codec->id;
de6d9b64 511 avctx->frame_number = 0;
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512 if (codec->priv_data_size > 0) {
513 avctx->priv_data = av_mallocz(codec->priv_data_size);
514 if (!avctx->priv_data)
515 return -ENOMEM;
516 } else {
517 avctx->priv_data = NULL;
518 }
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519
520 if(avctx->coded_width && avctx->coded_height)
521 avcodec_set_dimensions(avctx, avctx->coded_width, avctx->coded_height);
522 else if(avctx->width && avctx->height)
523 avcodec_set_dimensions(avctx, avctx->width, avctx->height);
524
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525 if((avctx->coded_width||avctx->coded_height) && avcodec_check_dimensions(avctx,avctx->coded_width,avctx->coded_height)){
526 av_freep(&avctx->priv_data);
527 return -1;
528 }
529
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530 ret = avctx->codec->init(avctx);
531 if (ret < 0) {
3123dd79 532 av_freep(&avctx->priv_data);
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533 return ret;
534 }
535 return 0;
536}
537
0c1a9eda 538int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size,
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539 const short *samples)
540{
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541 if(buf_size < FF_MIN_BUFFER_SIZE && 0){
542 av_log(avctx, AV_LOG_ERROR, "buffer smaller then minimum size\n");
543 return -1;
544 }
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545 if((avctx->codec->capabilities & CODEC_CAP_DELAY) || samples){
546 int ret = avctx->codec->encode(avctx, buf, buf_size, (void *)samples);
547 avctx->frame_number++;
548 return ret;
549 }else
550 return 0;
de6d9b64
FB
551}
552
0c1a9eda 553int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
492cd3a9 554 const AVFrame *pict)
de6d9b64 555{
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556 if(buf_size < FF_MIN_BUFFER_SIZE){
557 av_log(avctx, AV_LOG_ERROR, "buffer smaller then minimum size\n");
558 return -1;
559 }
560 if(avcodec_check_dimensions(avctx,avctx->width,avctx->height))
561 return -1;
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562 if((avctx->codec->capabilities & CODEC_CAP_DELAY) || pict){
563 int ret = avctx->codec->encode(avctx, buf, buf_size, (void *)pict);
564 avctx->frame_number++;
565 emms_c(); //needed to avoid a emms_c() call before every return;
6bb925f4 566
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567 return ret;
568 }else
569 return 0;
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570}
571
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572/**
573 * decode a frame.
574 * @param buf bitstream buffer, must be FF_INPUT_BUFFER_PADDING_SIZE larger then the actual read bytes
575 * because some optimized bitstream readers read 32 or 64 bit at once and could read over the end
576 * @param buf_size the size of the buffer in bytes
577 * @param got_picture_ptr zero if no frame could be decompressed, Otherwise, it is non zero
578 * @return -1 if error, otherwise return the number of
579 * bytes used.
580 */
492cd3a9 581int avcodec_decode_video(AVCodecContext *avctx, AVFrame *picture,
de6d9b64 582 int *got_picture_ptr,
0c1a9eda 583 uint8_t *buf, int buf_size)
de6d9b64
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584{
585 int ret;
1e491e29 586
53db1cae 587 *got_picture_ptr= 0;
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588 if((avctx->coded_width||avctx->coded_height) && avcodec_check_dimensions(avctx,avctx->coded_width,avctx->coded_height))
589 return -1;
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590 ret = avctx->codec->decode(avctx, picture, got_picture_ptr,
591 buf, buf_size);
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592
593 emms_c(); //needed to avoid a emms_c() call before every return;
1e491e29 594
1cb0edb4
J
595 if (*got_picture_ptr)
596 avctx->frame_number++;
de6d9b64
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597 return ret;
598}
599
600/* decode an audio frame. return -1 if error, otherwise return the
601 *number of bytes used. If no frame could be decompressed,
602 *frame_size_ptr is zero. Otherwise, it is the decompressed frame
603 *size in BYTES. */
0c1a9eda 604int avcodec_decode_audio(AVCodecContext *avctx, int16_t *samples,
de6d9b64 605 int *frame_size_ptr,
0c1a9eda 606 uint8_t *buf, int buf_size)
de6d9b64
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607{
608 int ret;
609
53db1cae 610 *frame_size_ptr= 0;
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611 ret = avctx->codec->decode(avctx, samples, frame_size_ptr,
612 buf, buf_size);
613 avctx->frame_number++;
614 return ret;
615}
616
617int avcodec_close(AVCodecContext *avctx)
618{
619 if (avctx->codec->close)
620 avctx->codec->close(avctx);
eea8c08f 621 avcodec_default_free_buffers(avctx);
3123dd79 622 av_freep(&avctx->priv_data);
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623 avctx->codec = NULL;
624 return 0;
625}
626
627AVCodec *avcodec_find_encoder(enum CodecID id)
628{
629 AVCodec *p;
630 p = first_avcodec;
631 while (p) {
632 if (p->encode != NULL && p->id == id)
633 return p;
634 p = p->next;
635 }
636 return NULL;
637}
638
98f3b098
A
639AVCodec *avcodec_find_encoder_by_name(const char *name)
640{
641 AVCodec *p;
642 p = first_avcodec;
643 while (p) {
644 if (p->encode != NULL && strcmp(name,p->name) == 0)
645 return p;
646 p = p->next;
647 }
648 return NULL;
649}
650
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651AVCodec *avcodec_find_decoder(enum CodecID id)
652{
653 AVCodec *p;
654 p = first_avcodec;
655 while (p) {
656 if (p->decode != NULL && p->id == id)
657 return p;
658 p = p->next;
659 }
660 return NULL;
661}
662
663AVCodec *avcodec_find_decoder_by_name(const char *name)
664{
665 AVCodec *p;
666 p = first_avcodec;
667 while (p) {
668 if (p->decode != NULL && strcmp(name,p->name) == 0)
669 return p;
670 p = p->next;
671 }
672 return NULL;
673}
674
50071f0b 675static AVCodec *avcodec_find(enum CodecID id)
de6d9b64
FB
676{
677 AVCodec *p;
678 p = first_avcodec;
679 while (p) {
680 if (p->id == id)
681 return p;
682 p = p->next;
683 }
684 return NULL;
685}
686
687void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)
688{
689 const char *codec_name;
690 AVCodec *p;
691 char buf1[32];
623563c0 692 char channels_str[100];
a96b68b7 693 int bitrate;
de6d9b64
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694
695 if (encode)
696 p = avcodec_find_encoder(enc->codec_id);
697 else
698 p = avcodec_find_decoder(enc->codec_id);
699
700 if (p) {
701 codec_name = p->name;
98ce5991
FB
702 if (!encode && enc->codec_id == CODEC_ID_MP3) {
703 if (enc->sub_id == 2)
704 codec_name = "mp2";
705 else if (enc->sub_id == 1)
706 codec_name = "mp1";
707 }
985180a1
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708 } else if (enc->codec_id == CODEC_ID_MPEG2TS) {
709 /* fake mpeg2 transport stream codec (currently not
710 registered) */
711 codec_name = "mpeg2ts";
de6d9b64
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712 } else if (enc->codec_name[0] != '\0') {
713 codec_name = enc->codec_name;
714 } else {
715 /* output avi tags */
716 if (enc->codec_type == CODEC_TYPE_VIDEO) {
717 snprintf(buf1, sizeof(buf1), "%c%c%c%c",
718 enc->codec_tag & 0xff,
719 (enc->codec_tag >> 8) & 0xff,
720 (enc->codec_tag >> 16) & 0xff,
721 (enc->codec_tag >> 24) & 0xff);
722 } else {
723 snprintf(buf1, sizeof(buf1), "0x%04x", enc->codec_tag);
724 }
725 codec_name = buf1;
726 }
727
728 switch(enc->codec_type) {
729 case CODEC_TYPE_VIDEO:
730 snprintf(buf, buf_size,
731 "Video: %s%s",
7d1c3fc1 732 codec_name, enc->mb_decision ? " (hq)" : "");
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FB
733 if (enc->codec_id == CODEC_ID_RAWVIDEO) {
734 snprintf(buf + strlen(buf), buf_size - strlen(buf),
735 ", %s",
9bbffbb1 736 avcodec_get_pix_fmt_name(enc->pix_fmt));
cf087595 737 }
de6d9b64
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738 if (enc->width) {
739 snprintf(buf + strlen(buf), buf_size - strlen(buf),
740 ", %dx%d, %0.2f fps",
741 enc->width, enc->height,
14bea432 742 (float)enc->frame_rate / enc->frame_rate_base);
de6d9b64 743 }
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744 if (encode) {
745 snprintf(buf + strlen(buf), buf_size - strlen(buf),
746 ", q=%d-%d", enc->qmin, enc->qmax);
747 }
a96b68b7 748 bitrate = enc->bit_rate;
de6d9b64
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749 break;
750 case CODEC_TYPE_AUDIO:
751 snprintf(buf, buf_size,
752 "Audio: %s",
753 codec_name);
e0d2714a
J
754 switch (enc->channels) {
755 case 1:
623563c0 756 strcpy(channels_str, "mono");
e0d2714a
J
757 break;
758 case 2:
623563c0 759 strcpy(channels_str, "stereo");
e0d2714a
J
760 break;
761 case 6:
623563c0 762 strcpy(channels_str, "5:1");
e0d2714a
J
763 break;
764 default:
2fc8ea24 765 snprintf(channels_str, sizeof(channels_str), "%d channels", enc->channels);
e0d2714a
J
766 break;
767 }
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768 if (enc->sample_rate) {
769 snprintf(buf + strlen(buf), buf_size - strlen(buf),
770 ", %d Hz, %s",
771 enc->sample_rate,
e0d2714a 772 channels_str);
de6d9b64 773 }
e0d2714a 774
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775 /* for PCM codecs, compute bitrate directly */
776 switch(enc->codec_id) {
777 case CODEC_ID_PCM_S16LE:
778 case CODEC_ID_PCM_S16BE:
779 case CODEC_ID_PCM_U16LE:
780 case CODEC_ID_PCM_U16BE:
a190b7e9 781 bitrate = enc->sample_rate * enc->channels * 16;
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FB
782 break;
783 case CODEC_ID_PCM_S8:
784 case CODEC_ID_PCM_U8:
785 case CODEC_ID_PCM_ALAW:
786 case CODEC_ID_PCM_MULAW:
a190b7e9 787 bitrate = enc->sample_rate * enc->channels * 8;
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788 break;
789 default:
790 bitrate = enc->bit_rate;
791 break;
792 }
de6d9b64 793 break;
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794 case CODEC_TYPE_DATA:
795 snprintf(buf, buf_size, "Data: %s", codec_name);
796 bitrate = enc->bit_rate;
797 break;
de6d9b64 798 default:
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799 snprintf(buf, buf_size, "Invalid Codec type %d", enc->codec_type);
800 return;
de6d9b64 801 }
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802 if (encode) {
803 if (enc->flags & CODEC_FLAG_PASS1)
804 snprintf(buf + strlen(buf), buf_size - strlen(buf),
805 ", pass 1");
806 if (enc->flags & CODEC_FLAG_PASS2)
807 snprintf(buf + strlen(buf), buf_size - strlen(buf),
808 ", pass 2");
809 }
a96b68b7 810 if (bitrate != 0) {
de6d9b64 811 snprintf(buf + strlen(buf), buf_size - strlen(buf),
a96b68b7 812 ", %d kb/s", bitrate / 1000);
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813 }
814}
815
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816unsigned avcodec_version( void )
817{
818 return LIBAVCODEC_VERSION_INT;
819}
cf087595 820
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821unsigned avcodec_build( void )
822{
823 return LIBAVCODEC_BUILD;
824}
825
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826/* must be called before any other functions */
827void avcodec_init(void)
828{
0344cd0a
AB
829 static int inited = 0;
830
831 if (inited != 0)
832 return;
833 inited = 1;
834
59cf08ce 835 dsputil_static_init();
de6d9b64
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836}
837
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838/**
839 * Flush buffers, should be called when seeking or when swicthing to a different stream.
840 */
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841void avcodec_flush_buffers(AVCodecContext *avctx)
842{
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843 if(avctx->codec->flush)
844 avctx->codec->flush(avctx);
1c2a8c7f
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845}
846
b100eab8 847void avcodec_default_free_buffers(AVCodecContext *s){
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848 int i, j;
849
850 if(s->internal_buffer==NULL) return;
851
852 for(i=0; i<INTERNAL_BUFFER_SIZE; i++){
853 InternalBuffer *buf= &((InternalBuffer*)s->internal_buffer)[i];
854 for(j=0; j<4; j++){
855 av_freep(&buf->base[j]);
856 buf->data[j]= NULL;
857 }
858 }
859 av_freep(&s->internal_buffer);
860
861 s->internal_buffer_count=0;
862}
863
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864char av_get_pict_type_char(int pict_type){
865 switch(pict_type){
866 case I_TYPE: return 'I';
867 case P_TYPE: return 'P';
868 case B_TYPE: return 'B';
869 case S_TYPE: return 'S';
870 case SI_TYPE:return 'i';
871 case SP_TYPE:return 'p';
872 default: return '?';
873 }
874}
875
14bea432 876int av_reduce(int *dst_nom, int *dst_den, int64_t nom, int64_t den, int64_t max){
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877 AVRational a0={0,1}, a1={1,0};
878 int sign= (nom<0) ^ (den<0);
879 int64_t gcd= ff_gcd(ABS(nom), ABS(den));
880
881 nom = ABS(nom)/gcd;
882 den = ABS(den)/gcd;
883 if(nom<=max && den<=max){
884 a1= (AVRational){nom, den};
885 den=0;
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886 }
887
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888 while(den){
889 int64_t x = nom / den;
890 int64_t next_den= nom - den*x;
891 int64_t a2n= x*a1.num + a0.num;
892 int64_t a2d= x*a1.den + a0.den;
893
894 if(a2n > max || a2d > max) break;
895
896 a0= a1;
897 a1= (AVRational){a2n, a2d};
898 nom= den;
899 den= next_den;
900 }
901 assert(ff_gcd(a1.num, a1.den) == 1);
5ed9f2e5 902
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903 *dst_nom = sign ? -a1.num : a1.num;
904 *dst_den = a1.den;
14bea432 905
5f63d108 906 return den==0;
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907}
908
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909int64_t av_rescale_rnd(int64_t a, int64_t b, int64_t c, enum AVRounding rnd){
910 AVInteger ai;
911 int64_t r=0;
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912 assert(c > 0);
913 assert(b >=0);
1f018225 914 assert(rnd >=0 && rnd<=5 && rnd!=4);
14bea432 915
15862411 916 if(a<0 && a != INT64_MIN) return -av_rescale_rnd(-a, b, c, rnd ^ ((rnd>>1)&1));
14bea432 917
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918 if(rnd==AV_ROUND_NEAR_INF) r= c/2;
919 else if(rnd&1) r= c-1;
920
4c263142
MN
921 if(b<=INT_MAX && c<=INT_MAX){
922 if(a<=INT_MAX)
1f018225 923 return (a * b + r)/c;
4c263142 924 else
1f018225 925 return a/c*b + (a%c*b + r)/c;
4c263142 926 }
14bea432 927
4c263142 928 ai= av_mul_i(av_int2i(a), av_int2i(b));
1f018225 929 ai= av_add_i(ai, av_int2i(r));
4c263142 930
1f018225
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931 return av_i2int(av_div_i(ai, av_int2i(c)));
932}
933
934int64_t av_rescale(int64_t a, int64_t b, int64_t c){
935 return av_rescale_rnd(a, b, c, AV_ROUND_NEAR_INF);
14bea432 936}
9b879566 937
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938int64_t ff_gcd(int64_t a, int64_t b){
939 if(b) return ff_gcd(b, a%b);
940 else return a;
941}
942
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943/* av_log API */
944
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945static int av_log_level = AV_LOG_DEBUG;
946
bc874dae 947static void av_log_default_callback(void* ptr, int level, const char* fmt, va_list vl)
9b879566 948{
89b9441a 949 static int print_prefix=1;
43465395 950 AVClass* avc= ptr ? *(AVClass**)ptr : NULL;
9b879566 951 if(level>av_log_level)
bc874dae 952 return;
d705e4a6 953#undef fprintf
43465395
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954 if(print_prefix && avc) {
955 fprintf(stderr, "[%s @ %p]", avc->item_name(ptr), avc);
bc874dae 956 }
d705e4a6 957#define fprintf please_use_av_log
89b9441a 958
95ba2c8f 959 print_prefix= strstr(fmt, "\n") != NULL;
89b9441a 960
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961 vfprintf(stderr, fmt, vl);
962}
963
bc874dae 964static void (*av_log_callback)(void*, int, const char*, va_list) = av_log_default_callback;
9b879566 965
bc874dae 966void av_log(void* avcl, int level, const char *fmt, ...)
9b879566
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967{
968 va_list vl;
969 va_start(vl, fmt);
bc874dae 970 av_vlog(avcl, level, fmt, vl);
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971 va_end(vl);
972}
973
bc874dae 974void av_vlog(void* avcl, int level, const char *fmt, va_list vl)
9b879566 975{
bc874dae 976 av_log_callback(avcl, level, fmt, vl);
9b879566
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977}
978
979int av_log_get_level(void)
980{
981 return av_log_level;
982}
983
984void av_log_set_level(int level)
985{
986 av_log_level = level;
987}
988
bc874dae 989void av_log_set_callback(void (*callback)(void*, int, const char*, va_list))
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990{
991 av_log_callback = callback;
992}
993
2450cff2 994#if !defined(HAVE_THREADS)
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995int avcodec_thread_init(AVCodecContext *s, int thread_count){
996 return -1;
997}
998#endif