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1
/*
2
 * utils for libavcodec
3
 * Copyright (c) 2001 Fabrice Bellard
4
 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
5
 *
6
 * This file is part of FFmpeg.
7
 *
8
 * FFmpeg is free software; you can redistribute it and/or
9
 * modify it under the terms of the GNU Lesser General Public
10
 * License as published by the Free Software Foundation; either
11
 * version 2.1 of the License, or (at your option) any later version.
12
 *
13
 * FFmpeg is distributed in the hope that it will be useful,
14
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16
 * Lesser General Public License for more details.
17
 *
18
 * You should have received a copy of the GNU Lesser General Public
19
 * License along with FFmpeg; if not, write to the Free Software
20
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21
 */
22

    
23
/**
24
 * @file libavcodec/utils.c
25
 * utils.
26
 */
27

    
28
/* needed for mkstemp() */
29
#define _XOPEN_SOURCE 600
30

    
31
#include "libavutil/avstring.h"
32
#include "libavutil/integer.h"
33
#include "libavutil/crc.h"
34
#include "avcodec.h"
35
#include "dsputil.h"
36
#include "opt.h"
37
#include "imgconvert.h"
38
#include "audioconvert.h"
39
#include "internal.h"
40
#include <stdlib.h>
41
#include <stdarg.h>
42
#include <limits.h>
43
#include <float.h>
44
#if !HAVE_MKSTEMP
45
#include <fcntl.h>
46
#endif
47

    
48
const uint8_t ff_reverse[256]={
49
0x00,0x80,0x40,0xC0,0x20,0xA0,0x60,0xE0,0x10,0x90,0x50,0xD0,0x30,0xB0,0x70,0xF0,
50
0x08,0x88,0x48,0xC8,0x28,0xA8,0x68,0xE8,0x18,0x98,0x58,0xD8,0x38,0xB8,0x78,0xF8,
51
0x04,0x84,0x44,0xC4,0x24,0xA4,0x64,0xE4,0x14,0x94,0x54,0xD4,0x34,0xB4,0x74,0xF4,
52
0x0C,0x8C,0x4C,0xCC,0x2C,0xAC,0x6C,0xEC,0x1C,0x9C,0x5C,0xDC,0x3C,0xBC,0x7C,0xFC,
53
0x02,0x82,0x42,0xC2,0x22,0xA2,0x62,0xE2,0x12,0x92,0x52,0xD2,0x32,0xB2,0x72,0xF2,
54
0x0A,0x8A,0x4A,0xCA,0x2A,0xAA,0x6A,0xEA,0x1A,0x9A,0x5A,0xDA,0x3A,0xBA,0x7A,0xFA,
55
0x06,0x86,0x46,0xC6,0x26,0xA6,0x66,0xE6,0x16,0x96,0x56,0xD6,0x36,0xB6,0x76,0xF6,
56
0x0E,0x8E,0x4E,0xCE,0x2E,0xAE,0x6E,0xEE,0x1E,0x9E,0x5E,0xDE,0x3E,0xBE,0x7E,0xFE,
57
0x01,0x81,0x41,0xC1,0x21,0xA1,0x61,0xE1,0x11,0x91,0x51,0xD1,0x31,0xB1,0x71,0xF1,
58
0x09,0x89,0x49,0xC9,0x29,0xA9,0x69,0xE9,0x19,0x99,0x59,0xD9,0x39,0xB9,0x79,0xF9,
59
0x05,0x85,0x45,0xC5,0x25,0xA5,0x65,0xE5,0x15,0x95,0x55,0xD5,0x35,0xB5,0x75,0xF5,
60
0x0D,0x8D,0x4D,0xCD,0x2D,0xAD,0x6D,0xED,0x1D,0x9D,0x5D,0xDD,0x3D,0xBD,0x7D,0xFD,
61
0x03,0x83,0x43,0xC3,0x23,0xA3,0x63,0xE3,0x13,0x93,0x53,0xD3,0x33,0xB3,0x73,0xF3,
62
0x0B,0x8B,0x4B,0xCB,0x2B,0xAB,0x6B,0xEB,0x1B,0x9B,0x5B,0xDB,0x3B,0xBB,0x7B,0xFB,
63
0x07,0x87,0x47,0xC7,0x27,0xA7,0x67,0xE7,0x17,0x97,0x57,0xD7,0x37,0xB7,0x77,0xF7,
64
0x0F,0x8F,0x4F,0xCF,0x2F,0xAF,0x6F,0xEF,0x1F,0x9F,0x5F,0xDF,0x3F,0xBF,0x7F,0xFF,
65
};
66

    
67
static int volatile entangled_thread_counter=0;
68

    
69
void *av_fast_realloc(void *ptr, unsigned int *size, unsigned int min_size)
70
{
71
    if(min_size < *size)
72
        return ptr;
73

    
74
    *size= FFMAX(17*min_size/16 + 32, min_size);
75

    
76
    ptr= av_realloc(ptr, *size);
77
    if(!ptr) //we could set this to the unmodified min_size but this is safer if the user lost the ptr and uses NULL now
78
        *size= 0;
79

    
80
    return ptr;
81
}
82

    
83
void av_fast_malloc(void *ptr, unsigned int *size, unsigned int min_size)
84
{
85
    void **p = ptr;
86
    if (min_size < *size)
87
        return;
88
    *size= FFMAX(17*min_size/16 + 32, min_size);
89
    av_free(*p);
90
    *p = av_malloc(*size);
91
    if (!*p) *size = 0;
92
}
93

    
94
/* encoder management */
95
static AVCodec *first_avcodec = NULL;
96

    
97
AVCodec *av_codec_next(AVCodec *c){
98
    if(c) return c->next;
99
    else  return first_avcodec;
100
}
101

    
102
void avcodec_register(AVCodec *codec)
103
{
104
    AVCodec **p;
105
    avcodec_init();
106
    p = &first_avcodec;
107
    while (*p != NULL) p = &(*p)->next;
108
    *p = codec;
109
    codec->next = NULL;
110
}
111

    
112
#if LIBAVCODEC_VERSION_MAJOR < 53
113
void register_avcodec(AVCodec *codec)
114
{
115
    avcodec_register(codec);
116
}
117
#endif
118

    
119
void avcodec_set_dimensions(AVCodecContext *s, int width, int height){
120
    s->coded_width = width;
121
    s->coded_height= height;
122
    s->width = -((-width )>>s->lowres);
123
    s->height= -((-height)>>s->lowres);
124
}
125

    
126
typedef struct InternalBuffer{
127
    int last_pic_num;
128
    uint8_t *base[4];
129
    uint8_t *data[4];
130
    int linesize[4];
131
    int width, height;
132
    enum PixelFormat pix_fmt;
133
}InternalBuffer;
134

    
135
#define INTERNAL_BUFFER_SIZE 32
136

    
137
#define ALIGN(x, a) (((x)+(a)-1)&~((a)-1))
138

    
139
void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height){
140
    int w_align= 1;
141
    int h_align= 1;
142

    
143
    switch(s->pix_fmt){
144
    case PIX_FMT_YUV420P:
145
    case PIX_FMT_YUYV422:
146
    case PIX_FMT_UYVY422:
147
    case PIX_FMT_YUV422P:
148
    case PIX_FMT_YUV444P:
149
    case PIX_FMT_GRAY8:
150
    case PIX_FMT_GRAY16BE:
151
    case PIX_FMT_GRAY16LE:
152
    case PIX_FMT_YUVJ420P:
153
    case PIX_FMT_YUVJ422P:
154
    case PIX_FMT_YUVJ444P:
155
    case PIX_FMT_YUVA420P:
156
        w_align= 16; //FIXME check for non mpeg style codecs and use less alignment
157
        h_align= 16;
158
        if(s->codec_id == CODEC_ID_MPEG2VIDEO)
159
            h_align= 32; // interlaced is rounded up to 2 MBs
160
        break;
161
    case PIX_FMT_YUV411P:
162
    case PIX_FMT_UYYVYY411:
163
        w_align=32;
164
        h_align=8;
165
        break;
166
    case PIX_FMT_YUV410P:
167
        if(s->codec_id == CODEC_ID_SVQ1){
168
            w_align=64;
169
            h_align=64;
170
        }
171
    case PIX_FMT_RGB555:
172
        if(s->codec_id == CODEC_ID_RPZA){
173
            w_align=4;
174
            h_align=4;
175
        }
176
    case PIX_FMT_PAL8:
177
    case PIX_FMT_BGR8:
178
    case PIX_FMT_RGB8:
179
        if(s->codec_id == CODEC_ID_SMC){
180
            w_align=4;
181
            h_align=4;
182
        }
183
        break;
184
    case PIX_FMT_BGR24:
185
        if((s->codec_id == CODEC_ID_MSZH) || (s->codec_id == CODEC_ID_ZLIB)){
186
            w_align=4;
187
            h_align=4;
188
        }
189
        break;
190
    default:
191
        w_align= 1;
192
        h_align= 1;
193
        break;
194
    }
195

    
196
    *width = ALIGN(*width , w_align);
197
    *height= ALIGN(*height, h_align);
198
    if(s->codec_id == CODEC_ID_H264)
199
        *height+=2; // some of the optimized chroma MC reads one line too much
200
}
201

    
202
int avcodec_check_dimensions(void *av_log_ctx, unsigned int w, unsigned int h){
203
    if((int)w>0 && (int)h>0 && (w+128)*(uint64_t)(h+128) < INT_MAX/8)
204
        return 0;
205

    
206
    av_log(av_log_ctx, AV_LOG_ERROR, "picture size invalid (%ux%u)\n", w, h);
207
    return -1;
208
}
209

    
210
int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic){
211
    int i;
212
    int w= s->width;
213
    int h= s->height;
214
    InternalBuffer *buf;
215
    int *picture_number;
216

    
217
    if(pic->data[0]!=NULL) {
218
        av_log(s, AV_LOG_ERROR, "pic->data[0]!=NULL in avcodec_default_get_buffer\n");
219
        return -1;
220
    }
221
    if(s->internal_buffer_count >= INTERNAL_BUFFER_SIZE) {
222
        av_log(s, AV_LOG_ERROR, "internal_buffer_count overflow (missing release_buffer?)\n");
223
        return -1;
224
    }
225

    
226
    if(avcodec_check_dimensions(s,w,h))
227
        return -1;
228

    
229
    if(s->internal_buffer==NULL){
230
        s->internal_buffer= av_mallocz((INTERNAL_BUFFER_SIZE+1)*sizeof(InternalBuffer));
231
    }
232
#if 0
233
    s->internal_buffer= av_fast_realloc(
234
        s->internal_buffer,
235
        &s->internal_buffer_size,
236
        sizeof(InternalBuffer)*FFMAX(99,  s->internal_buffer_count+1)/*FIXME*/
237
        );
238
#endif
239

    
240
    buf= &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
241
    picture_number= &(((InternalBuffer*)s->internal_buffer)[INTERNAL_BUFFER_SIZE]).last_pic_num; //FIXME ugly hack
242
    (*picture_number)++;
243

    
244
    if(buf->base[0] && (buf->width != w || buf->height != h || buf->pix_fmt != s->pix_fmt)){
245
        for(i=0; i<4; i++){
246
            av_freep(&buf->base[i]);
247
            buf->data[i]= NULL;
248
        }
249
    }
250

    
251
    if(buf->base[0]){
252
        pic->age= *picture_number - buf->last_pic_num;
253
        buf->last_pic_num= *picture_number;
254
    }else{
255
        int h_chroma_shift, v_chroma_shift;
256
        int size[4] = {0};
257
        int tmpsize;
258
        int unaligned;
259
        AVPicture picture;
260
        int stride_align[4];
261

    
262
        avcodec_get_chroma_sub_sample(s->pix_fmt, &h_chroma_shift, &v_chroma_shift);
263

    
264
        avcodec_align_dimensions(s, &w, &h);
265

    
266
        if(!(s->flags&CODEC_FLAG_EMU_EDGE)){
267
            w+= EDGE_WIDTH*2;
268
            h+= EDGE_WIDTH*2;
269
        }
270

    
271
        do {
272
            // NOTE: do not align linesizes individually, this breaks e.g. assumptions
273
            // that linesize[0] == 2*linesize[1] in the MPEG-encoder for 4:2:2
274
            ff_fill_linesize(&picture, s->pix_fmt, w);
275
            // increase alignment of w for next try (rhs gives the lowest bit set in w)
276
            w += w & ~(w-1);
277

    
278
            unaligned = 0;
279
            for (i=0; i<4; i++){
280
//STRIDE_ALIGN is 8 for SSE* but this does not work for SVQ1 chroma planes
281
//we could change STRIDE_ALIGN to 16 for x86/sse but it would increase the
282
//picture size unneccessarily in some cases. The solution here is not
283
//pretty and better ideas are welcome!
284
#if HAVE_MMX
285
                if(s->codec_id == CODEC_ID_SVQ1)
286
                    stride_align[i]= 16;
287
                else
288
#endif
289
                stride_align[i] = STRIDE_ALIGN;
290
                unaligned |= picture.linesize[i] % stride_align[i];
291
            }
292
        } while (unaligned);
293

    
294
        tmpsize = ff_fill_pointer(&picture, NULL, s->pix_fmt, h);
295
        if (tmpsize < 0)
296
            return -1;
297

    
298
        for (i=0; i<3 && picture.data[i+1]; i++)
299
            size[i] = picture.data[i+1] - picture.data[i];
300
        size[i] = tmpsize - (picture.data[i] - picture.data[0]);
301

    
302
        buf->last_pic_num= -256*256*256*64;
303
        memset(buf->base, 0, sizeof(buf->base));
304
        memset(buf->data, 0, sizeof(buf->data));
305

    
306
        for(i=0; i<4 && size[i]; i++){
307
            const int h_shift= i==0 ? 0 : h_chroma_shift;
308
            const int v_shift= i==0 ? 0 : v_chroma_shift;
309

    
310
            buf->linesize[i]= picture.linesize[i];
311

    
312
            buf->base[i]= av_malloc(size[i]+16); //FIXME 16
313
            if(buf->base[i]==NULL) return -1;
314
            memset(buf->base[i], 128, size[i]);
315

    
316
            // no edge if EDEG EMU or not planar YUV
317
            if((s->flags&CODEC_FLAG_EMU_EDGE) || !size[2])
318
                buf->data[i] = buf->base[i];
319
            else
320
                buf->data[i] = buf->base[i] + ALIGN((buf->linesize[i]*EDGE_WIDTH>>v_shift) + (EDGE_WIDTH>>h_shift), stride_align[i]);
321
        }
322
        if(size[1] && !size[2])
323
            ff_set_systematic_pal((uint32_t*)buf->data[1], s->pix_fmt);
324
        buf->width  = s->width;
325
        buf->height = s->height;
326
        buf->pix_fmt= s->pix_fmt;
327
        pic->age= 256*256*256*64;
328
    }
329
    pic->type= FF_BUFFER_TYPE_INTERNAL;
330

    
331
    for(i=0; i<4; i++){
332
        pic->base[i]= buf->base[i];
333
        pic->data[i]= buf->data[i];
334
        pic->linesize[i]= buf->linesize[i];
335
    }
336
    s->internal_buffer_count++;
337

    
338
    pic->reordered_opaque= s->reordered_opaque;
339

    
340
    if(s->debug&FF_DEBUG_BUFFERS)
341
        av_log(s, AV_LOG_DEBUG, "default_get_buffer called on pic %p, %d buffers used\n", pic, s->internal_buffer_count);
342

    
343
    return 0;
344
}
345

    
346
void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic){
347
    int i;
348
    InternalBuffer *buf, *last;
349

    
350
    assert(pic->type==FF_BUFFER_TYPE_INTERNAL);
351
    assert(s->internal_buffer_count);
352

    
353
    buf = NULL; /* avoids warning */
354
    for(i=0; i<s->internal_buffer_count; i++){ //just 3-5 checks so is not worth to optimize
355
        buf= &((InternalBuffer*)s->internal_buffer)[i];
356
        if(buf->data[0] == pic->data[0])
357
            break;
358
    }
359
    assert(i < s->internal_buffer_count);
360
    s->internal_buffer_count--;
361
    last = &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
362

    
363
    FFSWAP(InternalBuffer, *buf, *last);
364

    
365
    for(i=0; i<4; i++){
366
        pic->data[i]=NULL;
367
//        pic->base[i]=NULL;
368
    }
369
//printf("R%X\n", pic->opaque);
370

    
371
    if(s->debug&FF_DEBUG_BUFFERS)
372
        av_log(s, AV_LOG_DEBUG, "default_release_buffer called on pic %p, %d buffers used\n", pic, s->internal_buffer_count);
373
}
374

    
375
int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic){
376
    AVFrame temp_pic;
377
    int i;
378

    
379
    /* If no picture return a new buffer */
380
    if(pic->data[0] == NULL) {
381
        /* We will copy from buffer, so must be readable */
382
        pic->buffer_hints |= FF_BUFFER_HINTS_READABLE;
383
        return s->get_buffer(s, pic);
384
    }
385

    
386
    /* If internal buffer type return the same buffer */
387
    if(pic->type == FF_BUFFER_TYPE_INTERNAL)
388
        return 0;
389

    
390
    /*
391
     * Not internal type and reget_buffer not overridden, emulate cr buffer
392
     */
393
    temp_pic = *pic;
394
    for(i = 0; i < 4; i++)
395
        pic->data[i] = pic->base[i] = NULL;
396
    pic->opaque = NULL;
397
    /* Allocate new frame */
398
    if (s->get_buffer(s, pic))
399
        return -1;
400
    /* Copy image data from old buffer to new buffer */
401
    av_picture_copy((AVPicture*)pic, (AVPicture*)&temp_pic, s->pix_fmt, s->width,
402
             s->height);
403
    s->release_buffer(s, &temp_pic); // Release old frame
404
    return 0;
405
}
406

    
407
int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size){
408
    int i;
409

    
410
    for(i=0; i<count; i++){
411
        int r= func(c, (char*)arg + i*size);
412
        if(ret) ret[i]= r;
413
    }
414
    return 0;
415
}
416

    
417
enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat *fmt){
418
    while (*fmt != PIX_FMT_NONE && ff_is_hwaccel_pix_fmt(*fmt))
419
        ++fmt;
420
    return fmt[0];
421
}
422

    
423
void avcodec_get_frame_defaults(AVFrame *pic){
424
    memset(pic, 0, sizeof(AVFrame));
425

    
426
    pic->pts= AV_NOPTS_VALUE;
427
    pic->key_frame= 1;
428
}
429

    
430
AVFrame *avcodec_alloc_frame(void){
431
    AVFrame *pic= av_malloc(sizeof(AVFrame));
432

    
433
    if(pic==NULL) return NULL;
434

    
435
    avcodec_get_frame_defaults(pic);
436

    
437
    return pic;
438
}
439

    
440
int attribute_align_arg avcodec_open(AVCodecContext *avctx, AVCodec *codec)
441
{
442
    int ret= -1;
443

    
444
    entangled_thread_counter++;
445
    if(entangled_thread_counter != 1){
446
        av_log(avctx, AV_LOG_ERROR, "insufficient thread locking around avcodec_open/close()\n");
447
        goto end;
448
    }
449

    
450
    if(avctx->codec || !codec)
451
        goto end;
452

    
453
    if (codec->priv_data_size > 0) {
454
        avctx->priv_data = av_mallocz(codec->priv_data_size);
455
        if (!avctx->priv_data) {
456
            ret = AVERROR(ENOMEM);
457
            goto end;
458
        }
459
    } else {
460
        avctx->priv_data = NULL;
461
    }
462

    
463
    if(avctx->coded_width && avctx->coded_height)
464
        avcodec_set_dimensions(avctx, avctx->coded_width, avctx->coded_height);
465
    else if(avctx->width && avctx->height)
466
        avcodec_set_dimensions(avctx, avctx->width, avctx->height);
467

    
468
    if((avctx->coded_width||avctx->coded_height) && avcodec_check_dimensions(avctx,avctx->coded_width,avctx->coded_height)){
469
        av_freep(&avctx->priv_data);
470
        ret = AVERROR(EINVAL);
471
        goto end;
472
    }
473

    
474
    avctx->codec = codec;
475
    avctx->codec_id = codec->id;
476
    avctx->frame_number = 0;
477
    if(avctx->codec->init){
478
        ret = avctx->codec->init(avctx);
479
        if (ret < 0) {
480
            av_freep(&avctx->priv_data);
481
            avctx->codec= NULL;
482
            goto end;
483
        }
484
    }
485
    ret=0;
486
end:
487
    entangled_thread_counter--;
488
    return ret;
489
}
490

    
491
int attribute_align_arg avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size,
492
                         const short *samples)
493
{
494
    if(buf_size < FF_MIN_BUFFER_SIZE && 0){
495
        av_log(avctx, AV_LOG_ERROR, "buffer smaller than minimum size\n");
496
        return -1;
497
    }
498
    if((avctx->codec->capabilities & CODEC_CAP_DELAY) || samples){
499
        int ret = avctx->codec->encode(avctx, buf, buf_size, samples);
500
        avctx->frame_number++;
501
        return ret;
502
    }else
503
        return 0;
504
}
505

    
506
int attribute_align_arg avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
507
                         const AVFrame *pict)
508
{
509
    if(buf_size < FF_MIN_BUFFER_SIZE){
510
        av_log(avctx, AV_LOG_ERROR, "buffer smaller than minimum size\n");
511
        return -1;
512
    }
513
    if(avcodec_check_dimensions(avctx,avctx->width,avctx->height))
514
        return -1;
515
    if((avctx->codec->capabilities & CODEC_CAP_DELAY) || pict){
516
        int ret = avctx->codec->encode(avctx, buf, buf_size, pict);
517
        avctx->frame_number++;
518
        emms_c(); //needed to avoid an emms_c() call before every return;
519

    
520
        return ret;
521
    }else
522
        return 0;
523
}
524

    
525
int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
526
                            const AVSubtitle *sub)
527
{
528
    int ret;
529
    if(sub->start_display_time) {
530
        av_log(avctx, AV_LOG_ERROR, "start_display_time must be 0.\n");
531
        return -1;
532
    }
533
    if(sub->num_rects == 0 || !sub->rects)
534
        return -1;
535
    ret = avctx->codec->encode(avctx, buf, buf_size, sub);
536
    avctx->frame_number++;
537
    return ret;
538
}
539

    
540
#if LIBAVCODEC_VERSION_MAJOR < 53
541
int attribute_align_arg avcodec_decode_video(AVCodecContext *avctx, AVFrame *picture,
542
                         int *got_picture_ptr,
543
                         const uint8_t *buf, int buf_size)
544
{
545
    AVPacket avpkt;
546
    av_init_packet(&avpkt);
547
    avpkt.data = buf;
548
    avpkt.size = buf_size;
549

    
550
    return avcodec_decode_video2(avctx, picture, got_picture_ptr, &avpkt);
551
}
552
#endif
553

    
554
int attribute_align_arg avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
555
                         int *got_picture_ptr,
556
                         AVPacket *avpkt)
557
{
558
    int ret;
559

    
560
    *got_picture_ptr= 0;
561
    if((avctx->coded_width||avctx->coded_height) && avcodec_check_dimensions(avctx,avctx->coded_width,avctx->coded_height))
562
        return -1;
563
    if((avctx->codec->capabilities & CODEC_CAP_DELAY) || avpkt->size){
564
        ret = avctx->codec->decode(avctx, picture, got_picture_ptr,
565
                                avpkt);
566

    
567
        emms_c(); //needed to avoid an emms_c() call before every return;
568

    
569
        if (*got_picture_ptr)
570
            avctx->frame_number++;
571
    }else
572
        ret= 0;
573

    
574
    return ret;
575
}
576

    
577
#if LIBAVCODEC_VERSION_MAJOR < 53
578
int attribute_align_arg avcodec_decode_audio2(AVCodecContext *avctx, int16_t *samples,
579
                         int *frame_size_ptr,
580
                         const uint8_t *buf, int buf_size)
581
{
582
    AVPacket avpkt;
583
    av_init_packet(&avpkt);
584
    avpkt.data = buf;
585
    avpkt.size = buf_size;
586

    
587
    return avcodec_decode_audio3(avctx, samples, frame_size_ptr, &avpkt);
588
}
589
#endif
590

    
591
int attribute_align_arg avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples,
592
                         int *frame_size_ptr,
593
                         AVPacket *avpkt)
594
{
595
    int ret;
596

    
597
    if((avctx->codec->capabilities & CODEC_CAP_DELAY) || avpkt->size){
598
        //FIXME remove the check below _after_ ensuring that all audio check that the available space is enough
599
        if(*frame_size_ptr < AVCODEC_MAX_AUDIO_FRAME_SIZE){
600
            av_log(avctx, AV_LOG_ERROR, "buffer smaller than AVCODEC_MAX_AUDIO_FRAME_SIZE\n");
601
            return -1;
602
        }
603
        if(*frame_size_ptr < FF_MIN_BUFFER_SIZE ||
604
        *frame_size_ptr < avctx->channels * avctx->frame_size * sizeof(int16_t)){
605
            av_log(avctx, AV_LOG_ERROR, "buffer %d too small\n", *frame_size_ptr);
606
            return -1;
607
        }
608

    
609
        ret = avctx->codec->decode(avctx, samples, frame_size_ptr, avpkt);
610
        avctx->frame_number++;
611
    }else{
612
        ret= 0;
613
        *frame_size_ptr=0;
614
    }
615
    return ret;
616
}
617

    
618
#if LIBAVCODEC_VERSION_MAJOR < 53
619
int avcodec_decode_subtitle(AVCodecContext *avctx, AVSubtitle *sub,
620
                            int *got_sub_ptr,
621
                            const uint8_t *buf, int buf_size)
622
{
623
    AVPacket avpkt;
624
    av_init_packet(&avpkt);
625
    avpkt.data = buf;
626
    avpkt.size = buf_size;
627

    
628
    return avcodec_decode_subtitle2(avctx, sub, got_sub_ptr, &avpkt);
629
}
630
#endif
631

    
632
int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
633
                            int *got_sub_ptr,
634
                            AVPacket *avpkt)
635
{
636
    int ret;
637

    
638
    *got_sub_ptr = 0;
639
    ret = avctx->codec->decode(avctx, sub, got_sub_ptr, avpkt);
640
    if (*got_sub_ptr)
641
        avctx->frame_number++;
642
    return ret;
643
}
644

    
645
int avcodec_close(AVCodecContext *avctx)
646
{
647
    entangled_thread_counter++;
648
    if(entangled_thread_counter != 1){
649
        av_log(avctx, AV_LOG_ERROR, "insufficient thread locking around avcodec_open/close()\n");
650
        entangled_thread_counter--;
651
        return -1;
652
    }
653

    
654
    if (HAVE_THREADS && avctx->thread_opaque)
655
        avcodec_thread_free(avctx);
656
    if (avctx->codec->close)
657
        avctx->codec->close(avctx);
658
    avcodec_default_free_buffers(avctx);
659
    av_freep(&avctx->priv_data);
660
    avctx->codec = NULL;
661
    entangled_thread_counter--;
662
    return 0;
663
}
664

    
665
AVCodec *avcodec_find_encoder(enum CodecID id)
666
{
667
    AVCodec *p;
668
    p = first_avcodec;
669
    while (p) {
670
        if (p->encode != NULL && p->id == id)
671
            return p;
672
        p = p->next;
673
    }
674
    return NULL;
675
}
676

    
677
AVCodec *avcodec_find_encoder_by_name(const char *name)
678
{
679
    AVCodec *p;
680
    if (!name)
681
        return NULL;
682
    p = first_avcodec;
683
    while (p) {
684
        if (p->encode != NULL && strcmp(name,p->name) == 0)
685
            return p;
686
        p = p->next;
687
    }
688
    return NULL;
689
}
690

    
691
AVCodec *avcodec_find_decoder(enum CodecID id)
692
{
693
    AVCodec *p;
694
    p = first_avcodec;
695
    while (p) {
696
        if (p->decode != NULL && p->id == id)
697
            return p;
698
        p = p->next;
699
    }
700
    return NULL;
701
}
702

    
703
AVCodec *avcodec_find_decoder_by_name(const char *name)
704
{
705
    AVCodec *p;
706
    if (!name)
707
        return NULL;
708
    p = first_avcodec;
709
    while (p) {
710
        if (p->decode != NULL && strcmp(name,p->name) == 0)
711
            return p;
712
        p = p->next;
713
    }
714
    return NULL;
715
}
716

    
717
void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)
718
{
719
    const char *codec_name;
720
    AVCodec *p;
721
    char buf1[32];
722
    int bitrate;
723
    AVRational display_aspect_ratio;
724

    
725
    if (encode)
726
        p = avcodec_find_encoder(enc->codec_id);
727
    else
728
        p = avcodec_find_decoder(enc->codec_id);
729

    
730
    if (p) {
731
        codec_name = p->name;
732
    } else if (enc->codec_id == CODEC_ID_MPEG2TS) {
733
        /* fake mpeg2 transport stream codec (currently not
734
           registered) */
735
        codec_name = "mpeg2ts";
736
    } else if (enc->codec_name[0] != '\0') {
737
        codec_name = enc->codec_name;
738
    } else {
739
        /* output avi tags */
740
        if(   isprint(enc->codec_tag&0xFF) && isprint((enc->codec_tag>>8)&0xFF)
741
           && isprint((enc->codec_tag>>16)&0xFF) && isprint((enc->codec_tag>>24)&0xFF)){
742
            snprintf(buf1, sizeof(buf1), "%c%c%c%c / 0x%04X",
743
                     enc->codec_tag & 0xff,
744
                     (enc->codec_tag >> 8) & 0xff,
745
                     (enc->codec_tag >> 16) & 0xff,
746
                     (enc->codec_tag >> 24) & 0xff,
747
                      enc->codec_tag);
748
        } else {
749
            snprintf(buf1, sizeof(buf1), "0x%04x", enc->codec_tag);
750
        }
751
        codec_name = buf1;
752
    }
753

    
754
    switch(enc->codec_type) {
755
    case CODEC_TYPE_VIDEO:
756
        snprintf(buf, buf_size,
757
                 "Video: %s%s",
758
                 codec_name, enc->mb_decision ? " (hq)" : "");
759
        if (enc->pix_fmt != PIX_FMT_NONE) {
760
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
761
                     ", %s",
762
                     avcodec_get_pix_fmt_name(enc->pix_fmt));
763
        }
764
        if (enc->width) {
765
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
766
                     ", %dx%d",
767
                     enc->width, enc->height);
768
            if (enc->sample_aspect_ratio.num) {
769
                av_reduce(&display_aspect_ratio.num, &display_aspect_ratio.den,
770
                          enc->width*enc->sample_aspect_ratio.num,
771
                          enc->height*enc->sample_aspect_ratio.den,
772
                          1024*1024);
773
                snprintf(buf + strlen(buf), buf_size - strlen(buf),
774
                         " [PAR %d:%d DAR %d:%d]",
775
                         enc->sample_aspect_ratio.num, enc->sample_aspect_ratio.den,
776
                         display_aspect_ratio.num, display_aspect_ratio.den);
777
            }
778
            if(av_log_get_level() >= AV_LOG_DEBUG){
779
                int g= av_gcd(enc->time_base.num, enc->time_base.den);
780
                snprintf(buf + strlen(buf), buf_size - strlen(buf),
781
                     ", %d/%d",
782
                     enc->time_base.num/g, enc->time_base.den/g);
783
            }
784
        }
785
        if (encode) {
786
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
787
                     ", q=%d-%d", enc->qmin, enc->qmax);
788
        }
789
        bitrate = enc->bit_rate;
790
        break;
791
    case CODEC_TYPE_AUDIO:
792
        snprintf(buf, buf_size,
793
                 "Audio: %s",
794
                 codec_name);
795
        if (enc->sample_rate) {
796
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
797
                     ", %d Hz", enc->sample_rate);
798
        }
799
        av_strlcat(buf, ", ", buf_size);
800
        avcodec_get_channel_layout_string(buf + strlen(buf), buf_size - strlen(buf), enc->channels, enc->channel_layout);
801
        if (enc->sample_fmt != SAMPLE_FMT_NONE) {
802
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
803
                     ", %s", avcodec_get_sample_fmt_name(enc->sample_fmt));
804
        }
805

    
806
        /* for PCM codecs, compute bitrate directly */
807
        switch(enc->codec_id) {
808
        case CODEC_ID_PCM_F64BE:
809
        case CODEC_ID_PCM_F64LE:
810
            bitrate = enc->sample_rate * enc->channels * 64;
811
            break;
812
        case CODEC_ID_PCM_S32LE:
813
        case CODEC_ID_PCM_S32BE:
814
        case CODEC_ID_PCM_U32LE:
815
        case CODEC_ID_PCM_U32BE:
816
        case CODEC_ID_PCM_F32BE:
817
        case CODEC_ID_PCM_F32LE:
818
            bitrate = enc->sample_rate * enc->channels * 32;
819
            break;
820
        case CODEC_ID_PCM_S24LE:
821
        case CODEC_ID_PCM_S24BE:
822
        case CODEC_ID_PCM_U24LE:
823
        case CODEC_ID_PCM_U24BE:
824
        case CODEC_ID_PCM_S24DAUD:
825
            bitrate = enc->sample_rate * enc->channels * 24;
826
            break;
827
        case CODEC_ID_PCM_S16LE:
828
        case CODEC_ID_PCM_S16BE:
829
        case CODEC_ID_PCM_S16LE_PLANAR:
830
        case CODEC_ID_PCM_U16LE:
831
        case CODEC_ID_PCM_U16BE:
832
            bitrate = enc->sample_rate * enc->channels * 16;
833
            break;
834
        case CODEC_ID_PCM_S8:
835
        case CODEC_ID_PCM_U8:
836
        case CODEC_ID_PCM_ALAW:
837
        case CODEC_ID_PCM_MULAW:
838
        case CODEC_ID_PCM_ZORK:
839
            bitrate = enc->sample_rate * enc->channels * 8;
840
            break;
841
        default:
842
            bitrate = enc->bit_rate;
843
            break;
844
        }
845
        break;
846
    case CODEC_TYPE_DATA:
847
        snprintf(buf, buf_size, "Data: %s", codec_name);
848
        bitrate = enc->bit_rate;
849
        break;
850
    case CODEC_TYPE_SUBTITLE:
851
        snprintf(buf, buf_size, "Subtitle: %s", codec_name);
852
        bitrate = enc->bit_rate;
853
        break;
854
    case CODEC_TYPE_ATTACHMENT:
855
        snprintf(buf, buf_size, "Attachment: %s", codec_name);
856
        bitrate = enc->bit_rate;
857
        break;
858
    default:
859
        snprintf(buf, buf_size, "Invalid Codec type %d", enc->codec_type);
860
        return;
861
    }
862
    if (encode) {
863
        if (enc->flags & CODEC_FLAG_PASS1)
864
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
865
                     ", pass 1");
866
        if (enc->flags & CODEC_FLAG_PASS2)
867
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
868
                     ", pass 2");
869
    }
870
    if (bitrate != 0) {
871
        snprintf(buf + strlen(buf), buf_size - strlen(buf),
872
                 ", %d kb/s", bitrate / 1000);
873
    }
874
}
875

    
876
unsigned avcodec_version( void )
877
{
878
  return LIBAVCODEC_VERSION_INT;
879
}
880

    
881
void avcodec_init(void)
882
{
883
    static int initialized = 0;
884

    
885
    if (initialized != 0)
886
        return;
887
    initialized = 1;
888

    
889
    dsputil_static_init();
890
}
891

    
892
void avcodec_flush_buffers(AVCodecContext *avctx)
893
{
894
    if(avctx->codec->flush)
895
        avctx->codec->flush(avctx);
896
}
897

    
898
void avcodec_default_free_buffers(AVCodecContext *s){
899
    int i, j;
900

    
901
    if(s->internal_buffer==NULL) return;
902

    
903
    for(i=0; i<INTERNAL_BUFFER_SIZE; i++){
904
        InternalBuffer *buf= &((InternalBuffer*)s->internal_buffer)[i];
905
        for(j=0; j<4; j++){
906
            av_freep(&buf->base[j]);
907
            buf->data[j]= NULL;
908
        }
909
    }
910
    av_freep(&s->internal_buffer);
911

    
912
    s->internal_buffer_count=0;
913
}
914

    
915
char av_get_pict_type_char(int pict_type){
916
    switch(pict_type){
917
    case FF_I_TYPE: return 'I';
918
    case FF_P_TYPE: return 'P';
919
    case FF_B_TYPE: return 'B';
920
    case FF_S_TYPE: return 'S';
921
    case FF_SI_TYPE:return 'i';
922
    case FF_SP_TYPE:return 'p';
923
    case FF_BI_TYPE:return 'b';
924
    default:        return '?';
925
    }
926
}
927

    
928
int av_get_bits_per_sample(enum CodecID codec_id){
929
    switch(codec_id){
930
    case CODEC_ID_ADPCM_SBPRO_2:
931
        return 2;
932
    case CODEC_ID_ADPCM_SBPRO_3:
933
        return 3;
934
    case CODEC_ID_ADPCM_SBPRO_4:
935
    case CODEC_ID_ADPCM_CT:
936
        return 4;
937
    case CODEC_ID_PCM_ALAW:
938
    case CODEC_ID_PCM_MULAW:
939
    case CODEC_ID_PCM_S8:
940
    case CODEC_ID_PCM_U8:
941
    case CODEC_ID_PCM_ZORK:
942
        return 8;
943
    case CODEC_ID_PCM_S16BE:
944
    case CODEC_ID_PCM_S16LE:
945
    case CODEC_ID_PCM_S16LE_PLANAR:
946
    case CODEC_ID_PCM_U16BE:
947
    case CODEC_ID_PCM_U16LE:
948
        return 16;
949
    case CODEC_ID_PCM_S24DAUD:
950
    case CODEC_ID_PCM_S24BE:
951
    case CODEC_ID_PCM_S24LE:
952
    case CODEC_ID_PCM_U24BE:
953
    case CODEC_ID_PCM_U24LE:
954
        return 24;
955
    case CODEC_ID_PCM_S32BE:
956
    case CODEC_ID_PCM_S32LE:
957
    case CODEC_ID_PCM_U32BE:
958
    case CODEC_ID_PCM_U32LE:
959
    case CODEC_ID_PCM_F32BE:
960
    case CODEC_ID_PCM_F32LE:
961
        return 32;
962
    case CODEC_ID_PCM_F64BE:
963
    case CODEC_ID_PCM_F64LE:
964
        return 64;
965
    default:
966
        return 0;
967
    }
968
}
969

    
970
int av_get_bits_per_sample_format(enum SampleFormat sample_fmt) {
971
    switch (sample_fmt) {
972
    case SAMPLE_FMT_U8:
973
        return 8;
974
    case SAMPLE_FMT_S16:
975
        return 16;
976
    case SAMPLE_FMT_S32:
977
    case SAMPLE_FMT_FLT:
978
        return 32;
979
    case SAMPLE_FMT_DBL:
980
        return 64;
981
    default:
982
        return 0;
983
    }
984
}
985

    
986
#if !HAVE_THREADS
987
int avcodec_thread_init(AVCodecContext *s, int thread_count){
988
    return -1;
989
}
990
#endif
991

    
992
unsigned int av_xiphlacing(unsigned char *s, unsigned int v)
993
{
994
    unsigned int n = 0;
995

    
996
    while(v >= 0xff) {
997
        *s++ = 0xff;
998
        v -= 0xff;
999
        n++;
1000
    }
1001
    *s = v;
1002
    n++;
1003
    return n;
1004
}
1005

    
1006
/* Wrapper to work around the lack of mkstemp() on mingw/cygin.
1007
 * Also, tries to create file in /tmp first, if possible.
1008
 * *prefix can be a character constant; *filename will be allocated internally.
1009
 * Returns file descriptor of opened file (or -1 on error)
1010
 * and opened file name in **filename. */
1011
int av_tempfile(char *prefix, char **filename) {
1012
    int fd=-1;
1013
#if !HAVE_MKSTEMP
1014
    *filename = tempnam(".", prefix);
1015
#else
1016
    size_t len = strlen(prefix) + 12; /* room for "/tmp/" and "XXXXXX\0" */
1017
    *filename = av_malloc(len);
1018
#endif
1019
    /* -----common section-----*/
1020
    if (*filename == NULL) {
1021
        av_log(NULL, AV_LOG_ERROR, "ff_tempfile: Cannot allocate file name\n");
1022
        return -1;
1023
    }
1024
#if !HAVE_MKSTEMP
1025
    fd = open(*filename, O_RDWR | O_BINARY | O_CREAT, 0444);
1026
#else
1027
    snprintf(*filename, len, "/tmp/%sXXXXXX", prefix);
1028
    fd = mkstemp(*filename);
1029
    if (fd < 0) {
1030
        snprintf(*filename, len, "./%sXXXXXX", prefix);
1031
        fd = mkstemp(*filename);
1032
    }
1033
#endif
1034
    /* -----common section-----*/
1035
    if (fd < 0) {
1036
        av_log(NULL, AV_LOG_ERROR, "ff_tempfile: Cannot open temporary file %s\n", *filename);
1037
        return -1;
1038
    }
1039
    return fd; /* success */
1040
}
1041

    
1042
typedef struct {
1043
    const char *abbr;
1044
    int width, height;
1045
} VideoFrameSizeAbbr;
1046

    
1047
typedef struct {
1048
    const char *abbr;
1049
    int rate_num, rate_den;
1050
} VideoFrameRateAbbr;
1051

    
1052
static const VideoFrameSizeAbbr video_frame_size_abbrs[] = {
1053
    { "ntsc",      720, 480 },
1054
    { "pal",       720, 576 },
1055
    { "qntsc",     352, 240 }, /* VCD compliant NTSC */
1056
    { "qpal",      352, 288 }, /* VCD compliant PAL */
1057
    { "sntsc",     640, 480 }, /* square pixel NTSC */
1058
    { "spal",      768, 576 }, /* square pixel PAL */
1059
    { "film",      352, 240 },
1060
    { "ntsc-film", 352, 240 },
1061
    { "sqcif",     128,  96 },
1062
    { "qcif",      176, 144 },
1063
    { "cif",       352, 288 },
1064
    { "4cif",      704, 576 },
1065
    { "16cif",    1408,1152 },
1066
    { "qqvga",     160, 120 },
1067
    { "qvga",      320, 240 },
1068
    { "vga",       640, 480 },
1069
    { "svga",      800, 600 },
1070
    { "xga",      1024, 768 },
1071
    { "uxga",     1600,1200 },
1072
    { "qxga",     2048,1536 },
1073
    { "sxga",     1280,1024 },
1074
    { "qsxga",    2560,2048 },
1075
    { "hsxga",    5120,4096 },
1076
    { "wvga",      852, 480 },
1077
    { "wxga",     1366, 768 },
1078
    { "wsxga",    1600,1024 },
1079
    { "wuxga",    1920,1200 },
1080
    { "woxga",    2560,1600 },
1081
    { "wqsxga",   3200,2048 },
1082
    { "wquxga",   3840,2400 },
1083
    { "whsxga",   6400,4096 },
1084
    { "whuxga",   7680,4800 },
1085
    { "cga",       320, 200 },
1086
    { "ega",       640, 350 },
1087
    { "hd480",     852, 480 },
1088
    { "hd720",    1280, 720 },
1089
    { "hd1080",   1920,1080 },
1090
};
1091

    
1092
static const VideoFrameRateAbbr video_frame_rate_abbrs[]= {
1093
    { "ntsc",      30000, 1001 },
1094
    { "pal",          25,    1 },
1095
    { "qntsc",     30000, 1001 }, /* VCD compliant NTSC */
1096
    { "qpal",         25,    1 }, /* VCD compliant PAL */
1097
    { "sntsc",     30000, 1001 }, /* square pixel NTSC */
1098
    { "spal",         25,    1 }, /* square pixel PAL */
1099
    { "film",         24,    1 },
1100
    { "ntsc-film", 24000, 1001 },
1101
};
1102

    
1103
int av_parse_video_frame_size(int *width_ptr, int *height_ptr, const char *str)
1104
{
1105
    int i;
1106
    int n = FF_ARRAY_ELEMS(video_frame_size_abbrs);
1107
    char *p;
1108
    int frame_width = 0, frame_height = 0;
1109

    
1110
    for(i=0;i<n;i++) {
1111
        if (!strcmp(video_frame_size_abbrs[i].abbr, str)) {
1112
            frame_width = video_frame_size_abbrs[i].width;
1113
            frame_height = video_frame_size_abbrs[i].height;
1114
            break;
1115
        }
1116
    }
1117
    if (i == n) {
1118
        p = str;
1119
        frame_width = strtol(p, &p, 10);
1120
        if (*p)
1121
            p++;
1122
        frame_height = strtol(p, &p, 10);
1123
    }
1124
    if (frame_width <= 0 || frame_height <= 0)
1125
        return -1;
1126
    *width_ptr = frame_width;
1127
    *height_ptr = frame_height;
1128
    return 0;
1129
}
1130

    
1131
int av_parse_video_frame_rate(AVRational *frame_rate, const char *arg)
1132
{
1133
    int i;
1134
    int n = FF_ARRAY_ELEMS(video_frame_rate_abbrs);
1135
    char* cp;
1136

    
1137
    /* First, we check our abbreviation table */
1138
    for (i = 0; i < n; ++i)
1139
         if (!strcmp(video_frame_rate_abbrs[i].abbr, arg)) {
1140
             frame_rate->num = video_frame_rate_abbrs[i].rate_num;
1141
             frame_rate->den = video_frame_rate_abbrs[i].rate_den;
1142
             return 0;
1143
         }
1144

    
1145
    /* Then, we try to parse it as fraction */
1146
    cp = strchr(arg, '/');
1147
    if (!cp)
1148
        cp = strchr(arg, ':');
1149
    if (cp) {
1150
        char* cpp;
1151
        frame_rate->num = strtol(arg, &cpp, 10);
1152
        if (cpp != arg || cpp == cp)
1153
            frame_rate->den = strtol(cp+1, &cpp, 10);
1154
        else
1155
           frame_rate->num = 0;
1156
    }
1157
    else {
1158
        /* Finally we give up and parse it as double */
1159
        AVRational time_base = av_d2q(strtod(arg, 0), 1001000);
1160
        frame_rate->den = time_base.den;
1161
        frame_rate->num = time_base.num;
1162
    }
1163
    if (!frame_rate->num || !frame_rate->den)
1164
        return -1;
1165
    else
1166
        return 0;
1167
}
1168

    
1169
void ff_log_missing_feature(void *avc, const char *feature, int want_sample)
1170
{
1171
    av_log(avc, AV_LOG_WARNING, "%s not implemented. Update your FFmpeg "
1172
            "version to the newest one from SVN. If the problem still "
1173
            "occurs, it means that your file has a feature which has not "
1174
            "been implemented.", feature);
1175
    if(want_sample)
1176
        ff_log_ask_for_sample(avc, NULL);
1177
    else
1178
        av_log(avc, AV_LOG_WARNING, "\n");
1179
}
1180

    
1181
void ff_log_ask_for_sample(void *avc, const char *msg)
1182
{
1183
    if (msg)
1184
        av_log(avc, AV_LOG_WARNING, "%s ", msg);
1185
    av_log(avc, AV_LOG_WARNING, "If you want to help, upload a sample "
1186
            "of this file to ftp://upload.ffmpeg.org/MPlayer/incoming/ "
1187
            "and contact the ffmpeg-devel mailing list.\n");
1188
}
1189

    
1190
static AVHWAccel *first_hwaccel = NULL;
1191

    
1192
void av_register_hwaccel(AVHWAccel *hwaccel)
1193
{
1194
    AVHWAccel **p = &first_hwaccel;
1195
    while (*p)
1196
        p = &(*p)->next;
1197
    *p = hwaccel;
1198
    hwaccel->next = NULL;
1199
}
1200

    
1201
AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel)
1202
{
1203
    return hwaccel ? hwaccel->next : first_hwaccel;
1204
}
1205

    
1206
AVHWAccel *ff_find_hwaccel(enum CodecID codec_id, enum PixelFormat pix_fmt)
1207
{
1208
    AVHWAccel *hwaccel=NULL;
1209

    
1210
    while((hwaccel= av_hwaccel_next(hwaccel))){
1211
        if (   hwaccel->id      == codec_id
1212
            && hwaccel->pix_fmt == pix_fmt)
1213
            return hwaccel;
1214
    }
1215
    return NULL;
1216
}