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ffmpeg / libavcodec / utils.c @ c46eeae2

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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.
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 *
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
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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
static int volatile entangled_thread_counter=0;
49
int (*ff_lockmgr_cb)(void **mutex, enum AVLockOp op);
50
static void *codec_mutex;
51

    
52
void *av_fast_realloc(void *ptr, unsigned int *size, unsigned int min_size)
53
{
54
    if(min_size < *size)
55
        return ptr;
56

    
57
    *size= FFMAX(17*min_size/16 + 32, min_size);
58

    
59
    ptr= av_realloc(ptr, *size);
60
    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
61
        *size= 0;
62

    
63
    return ptr;
64
}
65

    
66
void av_fast_malloc(void *ptr, unsigned int *size, unsigned int min_size)
67
{
68
    void **p = ptr;
69
    if (min_size < *size)
70
        return;
71
    *size= FFMAX(17*min_size/16 + 32, min_size);
72
    av_free(*p);
73
    *p = av_malloc(*size);
74
    if (!*p) *size = 0;
75
}
76

    
77
/* encoder management */
78
static AVCodec *first_avcodec = NULL;
79

    
80
AVCodec *av_codec_next(AVCodec *c){
81
    if(c) return c->next;
82
    else  return first_avcodec;
83
}
84

    
85
void avcodec_register(AVCodec *codec)
86
{
87
    AVCodec **p;
88
    avcodec_init();
89
    p = &first_avcodec;
90
    while (*p != NULL) p = &(*p)->next;
91
    *p = codec;
92
    codec->next = NULL;
93
}
94

    
95
#if LIBAVCODEC_VERSION_MAJOR < 53
96
void register_avcodec(AVCodec *codec)
97
{
98
    avcodec_register(codec);
99
}
100
#endif
101

    
102
void avcodec_set_dimensions(AVCodecContext *s, int width, int height){
103
    s->coded_width = width;
104
    s->coded_height= height;
105
    s->width = -((-width )>>s->lowres);
106
    s->height= -((-height)>>s->lowres);
107
}
108

    
109
typedef struct InternalBuffer{
110
    int last_pic_num;
111
    uint8_t *base[4];
112
    uint8_t *data[4];
113
    int linesize[4];
114
    int width, height;
115
    enum PixelFormat pix_fmt;
116
}InternalBuffer;
117

    
118
#define INTERNAL_BUFFER_SIZE 32
119

    
120
void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height){
121
    int w_align= 1;
122
    int h_align= 1;
123

    
124
    switch(s->pix_fmt){
125
    case PIX_FMT_YUV420P:
126
    case PIX_FMT_YUYV422:
127
    case PIX_FMT_UYVY422:
128
    case PIX_FMT_YUV422P:
129
    case PIX_FMT_YUV440P:
130
    case PIX_FMT_YUV444P:
131
    case PIX_FMT_GRAY8:
132
    case PIX_FMT_GRAY16BE:
133
    case PIX_FMT_GRAY16LE:
134
    case PIX_FMT_YUVJ420P:
135
    case PIX_FMT_YUVJ422P:
136
    case PIX_FMT_YUVJ440P:
137
    case PIX_FMT_YUVJ444P:
138
    case PIX_FMT_YUVA420P:
139
        w_align= 16; //FIXME check for non mpeg style codecs and use less alignment
140
        h_align= 16;
141
        if(s->codec_id == CODEC_ID_MPEG2VIDEO || s->codec_id == CODEC_ID_MJPEG || s->codec_id == CODEC_ID_AMV || s->codec_id == CODEC_ID_THP)
142
            h_align= 32; // interlaced is rounded up to 2 MBs
143
        break;
144
    case PIX_FMT_YUV411P:
145
    case PIX_FMT_UYYVYY411:
146
        w_align=32;
147
        h_align=8;
148
        break;
149
    case PIX_FMT_YUV410P:
150
        if(s->codec_id == CODEC_ID_SVQ1){
151
            w_align=64;
152
            h_align=64;
153
        }
154
    case PIX_FMT_RGB555:
155
        if(s->codec_id == CODEC_ID_RPZA){
156
            w_align=4;
157
            h_align=4;
158
        }
159
    case PIX_FMT_PAL8:
160
    case PIX_FMT_BGR8:
161
    case PIX_FMT_RGB8:
162
        if(s->codec_id == CODEC_ID_SMC){
163
            w_align=4;
164
            h_align=4;
165
        }
166
        break;
167
    case PIX_FMT_BGR24:
168
        if((s->codec_id == CODEC_ID_MSZH) || (s->codec_id == CODEC_ID_ZLIB)){
169
            w_align=4;
170
            h_align=4;
171
        }
172
        break;
173
    default:
174
        w_align= 1;
175
        h_align= 1;
176
        break;
177
    }
178

    
179
    *width = FFALIGN(*width , w_align);
180
    *height= FFALIGN(*height, h_align);
181
    if(s->codec_id == CODEC_ID_H264)
182
        *height+=2; // some of the optimized chroma MC reads one line too much
183
}
184

    
185
int avcodec_check_dimensions(void *av_log_ctx, unsigned int w, unsigned int h){
186
    if((int)w>0 && (int)h>0 && (w+128)*(uint64_t)(h+128) < INT_MAX/8)
187
        return 0;
188

    
189
    av_log(av_log_ctx, AV_LOG_ERROR, "picture size invalid (%ux%u)\n", w, h);
190
    return -1;
191
}
192

    
193
int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic){
194
    int i;
195
    int w= s->width;
196
    int h= s->height;
197
    InternalBuffer *buf;
198
    int *picture_number;
199

    
200
    if(pic->data[0]!=NULL) {
201
        av_log(s, AV_LOG_ERROR, "pic->data[0]!=NULL in avcodec_default_get_buffer\n");
202
        return -1;
203
    }
204
    if(s->internal_buffer_count >= INTERNAL_BUFFER_SIZE) {
205
        av_log(s, AV_LOG_ERROR, "internal_buffer_count overflow (missing release_buffer?)\n");
206
        return -1;
207
    }
208

    
209
    if(avcodec_check_dimensions(s,w,h))
210
        return -1;
211

    
212
    if(s->internal_buffer==NULL){
213
        s->internal_buffer= av_mallocz((INTERNAL_BUFFER_SIZE+1)*sizeof(InternalBuffer));
214
    }
215
#if 0
216
    s->internal_buffer= av_fast_realloc(
217
        s->internal_buffer,
218
        &s->internal_buffer_size,
219
        sizeof(InternalBuffer)*FFMAX(99,  s->internal_buffer_count+1)/*FIXME*/
220
        );
221
#endif
222

    
223
    buf= &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
224
    picture_number= &(((InternalBuffer*)s->internal_buffer)[INTERNAL_BUFFER_SIZE]).last_pic_num; //FIXME ugly hack
225
    (*picture_number)++;
226

    
227
    if(buf->base[0] && (buf->width != w || buf->height != h || buf->pix_fmt != s->pix_fmt)){
228
        for(i=0; i<4; i++){
229
            av_freep(&buf->base[i]);
230
            buf->data[i]= NULL;
231
        }
232
    }
233

    
234
    if(buf->base[0]){
235
        pic->age= *picture_number - buf->last_pic_num;
236
        buf->last_pic_num= *picture_number;
237
    }else{
238
        int h_chroma_shift, v_chroma_shift;
239
        int size[4] = {0};
240
        int tmpsize;
241
        int unaligned;
242
        AVPicture picture;
243
        int stride_align[4];
244

    
245
        avcodec_get_chroma_sub_sample(s->pix_fmt, &h_chroma_shift, &v_chroma_shift);
246

    
247
        avcodec_align_dimensions(s, &w, &h);
248

    
249
        if(!(s->flags&CODEC_FLAG_EMU_EDGE)){
250
            w+= EDGE_WIDTH*2;
251
            h+= EDGE_WIDTH*2;
252
        }
253

    
254
        do {
255
            // NOTE: do not align linesizes individually, this breaks e.g. assumptions
256
            // that linesize[0] == 2*linesize[1] in the MPEG-encoder for 4:2:2
257
            ff_fill_linesize(&picture, s->pix_fmt, w);
258
            // increase alignment of w for next try (rhs gives the lowest bit set in w)
259
            w += w & ~(w-1);
260

    
261
            unaligned = 0;
262
            for (i=0; i<4; i++){
263
//STRIDE_ALIGN is 8 for SSE* but this does not work for SVQ1 chroma planes
264
//we could change STRIDE_ALIGN to 16 for x86/sse but it would increase the
265
//picture size unneccessarily in some cases. The solution here is not
266
//pretty and better ideas are welcome!
267
#if HAVE_MMX
268
                if(s->codec_id == CODEC_ID_SVQ1)
269
                    stride_align[i]= 16;
270
                else
271
#endif
272
                stride_align[i] = STRIDE_ALIGN;
273
                unaligned |= picture.linesize[i] % stride_align[i];
274
            }
275
        } while (unaligned);
276

    
277
        tmpsize = ff_fill_pointer(&picture, NULL, s->pix_fmt, h);
278
        if (tmpsize < 0)
279
            return -1;
280

    
281
        for (i=0; i<3 && picture.data[i+1]; i++)
282
            size[i] = picture.data[i+1] - picture.data[i];
283
        size[i] = tmpsize - (picture.data[i] - picture.data[0]);
284

    
285
        buf->last_pic_num= -256*256*256*64;
286
        memset(buf->base, 0, sizeof(buf->base));
287
        memset(buf->data, 0, sizeof(buf->data));
288

    
289
        for(i=0; i<4 && size[i]; i++){
290
            const int h_shift= i==0 ? 0 : h_chroma_shift;
291
            const int v_shift= i==0 ? 0 : v_chroma_shift;
292

    
293
            buf->linesize[i]= picture.linesize[i];
294

    
295
            buf->base[i]= av_malloc(size[i]+16); //FIXME 16
296
            if(buf->base[i]==NULL) return -1;
297
            memset(buf->base[i], 128, size[i]);
298

    
299
            // no edge if EDEG EMU or not planar YUV
300
            if((s->flags&CODEC_FLAG_EMU_EDGE) || !size[2])
301
                buf->data[i] = buf->base[i];
302
            else
303
                buf->data[i] = buf->base[i] + FFALIGN((buf->linesize[i]*EDGE_WIDTH>>v_shift) + (EDGE_WIDTH>>h_shift), stride_align[i]);
304
        }
305
        if(size[1] && !size[2])
306
            ff_set_systematic_pal((uint32_t*)buf->data[1], s->pix_fmt);
307
        buf->width  = s->width;
308
        buf->height = s->height;
309
        buf->pix_fmt= s->pix_fmt;
310
        pic->age= 256*256*256*64;
311
    }
312
    pic->type= FF_BUFFER_TYPE_INTERNAL;
313

    
314
    for(i=0; i<4; i++){
315
        pic->base[i]= buf->base[i];
316
        pic->data[i]= buf->data[i];
317
        pic->linesize[i]= buf->linesize[i];
318
    }
319
    s->internal_buffer_count++;
320

    
321
    pic->reordered_opaque= s->reordered_opaque;
322

    
323
    if(s->debug&FF_DEBUG_BUFFERS)
324
        av_log(s, AV_LOG_DEBUG, "default_get_buffer called on pic %p, %d buffers used\n", pic, s->internal_buffer_count);
325

    
326
    return 0;
327
}
328

    
329
void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic){
330
    int i;
331
    InternalBuffer *buf, *last;
332

    
333
    assert(pic->type==FF_BUFFER_TYPE_INTERNAL);
334
    assert(s->internal_buffer_count);
335

    
336
    buf = NULL; /* avoids warning */
337
    for(i=0; i<s->internal_buffer_count; i++){ //just 3-5 checks so is not worth to optimize
338
        buf= &((InternalBuffer*)s->internal_buffer)[i];
339
        if(buf->data[0] == pic->data[0])
340
            break;
341
    }
342
    assert(i < s->internal_buffer_count);
343
    s->internal_buffer_count--;
344
    last = &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
345

    
346
    FFSWAP(InternalBuffer, *buf, *last);
347

    
348
    for(i=0; i<4; i++){
349
        pic->data[i]=NULL;
350
//        pic->base[i]=NULL;
351
    }
352
//printf("R%X\n", pic->opaque);
353

    
354
    if(s->debug&FF_DEBUG_BUFFERS)
355
        av_log(s, AV_LOG_DEBUG, "default_release_buffer called on pic %p, %d buffers used\n", pic, s->internal_buffer_count);
356
}
357

    
358
int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic){
359
    AVFrame temp_pic;
360
    int i;
361

    
362
    /* If no picture return a new buffer */
363
    if(pic->data[0] == NULL) {
364
        /* We will copy from buffer, so must be readable */
365
        pic->buffer_hints |= FF_BUFFER_HINTS_READABLE;
366
        return s->get_buffer(s, pic);
367
    }
368

    
369
    /* If internal buffer type return the same buffer */
370
    if(pic->type == FF_BUFFER_TYPE_INTERNAL) {
371
        pic->reordered_opaque= s->reordered_opaque;
372
        return 0;
373
    }
374

    
375
    /*
376
     * Not internal type and reget_buffer not overridden, emulate cr buffer
377
     */
378
    temp_pic = *pic;
379
    for(i = 0; i < 4; i++)
380
        pic->data[i] = pic->base[i] = NULL;
381
    pic->opaque = NULL;
382
    /* Allocate new frame */
383
    if (s->get_buffer(s, pic))
384
        return -1;
385
    /* Copy image data from old buffer to new buffer */
386
    av_picture_copy((AVPicture*)pic, (AVPicture*)&temp_pic, s->pix_fmt, s->width,
387
             s->height);
388
    s->release_buffer(s, &temp_pic); // Release old frame
389
    return 0;
390
}
391

    
392
int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size){
393
    int i;
394

    
395
    for(i=0; i<count; i++){
396
        int r= func(c, (char*)arg + i*size);
397
        if(ret) ret[i]= r;
398
    }
399
    return 0;
400
}
401

    
402
int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int jobnr, int threadnr),void *arg, int *ret, int count){
403
    int i;
404

    
405
    for(i=0; i<count; i++){
406
        int r= func(c, arg, i, 0);
407
        if(ret) ret[i]= r;
408
    }
409
    return 0;
410
}
411

    
412
enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat *fmt){
413
    while (*fmt != PIX_FMT_NONE && ff_is_hwaccel_pix_fmt(*fmt))
414
        ++fmt;
415
    return fmt[0];
416
}
417

    
418
void avcodec_get_frame_defaults(AVFrame *pic){
419
    memset(pic, 0, sizeof(AVFrame));
420

    
421
    pic->pts= AV_NOPTS_VALUE;
422
    pic->key_frame= 1;
423
}
424

    
425
AVFrame *avcodec_alloc_frame(void){
426
    AVFrame *pic= av_malloc(sizeof(AVFrame));
427

    
428
    if(pic==NULL) return NULL;
429

    
430
    avcodec_get_frame_defaults(pic);
431

    
432
    return pic;
433
}
434

    
435
int attribute_align_arg avcodec_open(AVCodecContext *avctx, AVCodec *codec)
436
{
437
    int ret= -1;
438

    
439
    /* If there is a user-supplied mutex locking routine, call it. */
440
    if (ff_lockmgr_cb) {
441
        if ((*ff_lockmgr_cb)(&codec_mutex, AV_LOCK_OBTAIN))
442
            return -1;
443
    }
444

    
445
    entangled_thread_counter++;
446
    if(entangled_thread_counter != 1){
447
        av_log(avctx, AV_LOG_ERROR, "insufficient thread locking around avcodec_open/close()\n");
448
        goto end;
449
    }
450

    
451
    if(avctx->codec || !codec)
452
        goto end;
453

    
454
    if (codec->priv_data_size > 0) {
455
        avctx->priv_data = av_mallocz(codec->priv_data_size);
456
        if (!avctx->priv_data) {
457
            ret = AVERROR(ENOMEM);
458
            goto end;
459
        }
460
    } else {
461
        avctx->priv_data = NULL;
462
    }
463

    
464
    if(avctx->coded_width && avctx->coded_height)
465
        avcodec_set_dimensions(avctx, avctx->coded_width, avctx->coded_height);
466
    else if(avctx->width && avctx->height)
467
        avcodec_set_dimensions(avctx, avctx->width, avctx->height);
468

    
469
#define SANE_NB_CHANNELS 128U
470
    if (((avctx->coded_width || avctx->coded_height)
471
        && avcodec_check_dimensions(avctx, avctx->coded_width, avctx->coded_height))
472
        || avctx->channels > SANE_NB_CHANNELS) {
473
        ret = AVERROR(EINVAL);
474
        goto free_and_end;
475
    }
476

    
477
    avctx->codec = codec;
478
    if ((avctx->codec_type == CODEC_TYPE_UNKNOWN || avctx->codec_type == codec->type) &&
479
        avctx->codec_id == CODEC_ID_NONE) {
480
        avctx->codec_type = codec->type;
481
        avctx->codec_id   = codec->id;
482
    }
483
    if(avctx->codec_id != codec->id || avctx->codec_type != codec->type){
484
        av_log(avctx, AV_LOG_ERROR, "codec type or id mismatches\n");
485
        goto free_and_end;
486
    }
487
    avctx->frame_number = 0;
488
    if(avctx->codec->init){
489
        ret = avctx->codec->init(avctx);
490
        if (ret < 0) {
491
            goto free_and_end;
492
        }
493
    }
494
    ret=0;
495
end:
496
    entangled_thread_counter--;
497

    
498
    /* Release any user-supplied mutex. */
499
    if (ff_lockmgr_cb) {
500
        (*ff_lockmgr_cb)(&codec_mutex, AV_LOCK_RELEASE);
501
    }
502
    return ret;
503
free_and_end:
504
    av_freep(&avctx->priv_data);
505
    avctx->codec= NULL;
506
    goto end;
507
}
508

    
509
int attribute_align_arg avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size,
510
                         const short *samples)
511
{
512
    if(buf_size < FF_MIN_BUFFER_SIZE && 0){
513
        av_log(avctx, AV_LOG_ERROR, "buffer smaller than minimum size\n");
514
        return -1;
515
    }
516
    if((avctx->codec->capabilities & CODEC_CAP_DELAY) || samples){
517
        int ret = avctx->codec->encode(avctx, buf, buf_size, samples);
518
        avctx->frame_number++;
519
        return ret;
520
    }else
521
        return 0;
522
}
523

    
524
int attribute_align_arg avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
525
                         const AVFrame *pict)
526
{
527
    if(buf_size < FF_MIN_BUFFER_SIZE){
528
        av_log(avctx, AV_LOG_ERROR, "buffer smaller than minimum size\n");
529
        return -1;
530
    }
531
    if(avcodec_check_dimensions(avctx,avctx->width,avctx->height))
532
        return -1;
533
    if((avctx->codec->capabilities & CODEC_CAP_DELAY) || pict){
534
        int ret = avctx->codec->encode(avctx, buf, buf_size, pict);
535
        avctx->frame_number++;
536
        emms_c(); //needed to avoid an emms_c() call before every return;
537

    
538
        return ret;
539
    }else
540
        return 0;
541
}
542

    
543
int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
544
                            const AVSubtitle *sub)
545
{
546
    int ret;
547
    if(sub->start_display_time) {
548
        av_log(avctx, AV_LOG_ERROR, "start_display_time must be 0.\n");
549
        return -1;
550
    }
551
    if(sub->num_rects == 0 || !sub->rects)
552
        return -1;
553
    ret = avctx->codec->encode(avctx, buf, buf_size, sub);
554
    avctx->frame_number++;
555
    return ret;
556
}
557

    
558
#if LIBAVCODEC_VERSION_MAJOR < 53
559
int attribute_align_arg avcodec_decode_video(AVCodecContext *avctx, AVFrame *picture,
560
                         int *got_picture_ptr,
561
                         const uint8_t *buf, int buf_size)
562
{
563
    AVPacket avpkt;
564
    av_init_packet(&avpkt);
565
    avpkt.data = buf;
566
    avpkt.size = buf_size;
567
    // HACK for CorePNG to decode as normal PNG by default
568
    avpkt.flags = AV_PKT_FLAG_KEY;
569

    
570
    return avcodec_decode_video2(avctx, picture, got_picture_ptr, &avpkt);
571
}
572
#endif
573

    
574
int attribute_align_arg avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
575
                         int *got_picture_ptr,
576
                         AVPacket *avpkt)
577
{
578
    int ret;
579

    
580
    *got_picture_ptr= 0;
581
    if((avctx->coded_width||avctx->coded_height) && avcodec_check_dimensions(avctx,avctx->coded_width,avctx->coded_height))
582
        return -1;
583
    if((avctx->codec->capabilities & CODEC_CAP_DELAY) || avpkt->size){
584
        ret = avctx->codec->decode(avctx, picture, got_picture_ptr,
585
                                avpkt);
586

    
587
        emms_c(); //needed to avoid an emms_c() call before every return;
588

    
589
        if (*got_picture_ptr)
590
            avctx->frame_number++;
591
    }else
592
        ret= 0;
593

    
594
    return ret;
595
}
596

    
597
#if LIBAVCODEC_VERSION_MAJOR < 53
598
int attribute_align_arg avcodec_decode_audio2(AVCodecContext *avctx, int16_t *samples,
599
                         int *frame_size_ptr,
600
                         const uint8_t *buf, int buf_size)
601
{
602
    AVPacket avpkt;
603
    av_init_packet(&avpkt);
604
    avpkt.data = buf;
605
    avpkt.size = buf_size;
606

    
607
    return avcodec_decode_audio3(avctx, samples, frame_size_ptr, &avpkt);
608
}
609
#endif
610

    
611
int attribute_align_arg avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples,
612
                         int *frame_size_ptr,
613
                         AVPacket *avpkt)
614
{
615
    int ret;
616

    
617
    if((avctx->codec->capabilities & CODEC_CAP_DELAY) || avpkt->size){
618
        //FIXME remove the check below _after_ ensuring that all audio check that the available space is enough
619
        if(*frame_size_ptr < AVCODEC_MAX_AUDIO_FRAME_SIZE){
620
            av_log(avctx, AV_LOG_ERROR, "buffer smaller than AVCODEC_MAX_AUDIO_FRAME_SIZE\n");
621
            return -1;
622
        }
623
        if(*frame_size_ptr < FF_MIN_BUFFER_SIZE ||
624
        *frame_size_ptr < avctx->channels * avctx->frame_size * sizeof(int16_t)){
625
            av_log(avctx, AV_LOG_ERROR, "buffer %d too small\n", *frame_size_ptr);
626
            return -1;
627
        }
628

    
629
        ret = avctx->codec->decode(avctx, samples, frame_size_ptr, avpkt);
630
        avctx->frame_number++;
631
    }else{
632
        ret= 0;
633
        *frame_size_ptr=0;
634
    }
635
    return ret;
636
}
637

    
638
#if LIBAVCODEC_VERSION_MAJOR < 53
639
int avcodec_decode_subtitle(AVCodecContext *avctx, AVSubtitle *sub,
640
                            int *got_sub_ptr,
641
                            const uint8_t *buf, int buf_size)
642
{
643
    AVPacket avpkt;
644
    av_init_packet(&avpkt);
645
    avpkt.data = buf;
646
    avpkt.size = buf_size;
647

    
648
    return avcodec_decode_subtitle2(avctx, sub, got_sub_ptr, &avpkt);
649
}
650
#endif
651

    
652
int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
653
                            int *got_sub_ptr,
654
                            AVPacket *avpkt)
655
{
656
    int ret;
657

    
658
    *got_sub_ptr = 0;
659
    ret = avctx->codec->decode(avctx, sub, got_sub_ptr, avpkt);
660
    if (*got_sub_ptr)
661
        avctx->frame_number++;
662
    return ret;
663
}
664

    
665
int avcodec_close(AVCodecContext *avctx)
666
{
667
    /* If there is a user-supplied mutex locking routine, call it. */
668
    if (ff_lockmgr_cb) {
669
        if ((*ff_lockmgr_cb)(&codec_mutex, AV_LOCK_OBTAIN))
670
            return -1;
671
    }
672

    
673
    entangled_thread_counter++;
674
    if(entangled_thread_counter != 1){
675
        av_log(avctx, AV_LOG_ERROR, "insufficient thread locking around avcodec_open/close()\n");
676
        entangled_thread_counter--;
677
        return -1;
678
    }
679

    
680
    if (HAVE_THREADS && avctx->thread_opaque)
681
        avcodec_thread_free(avctx);
682
    if (avctx->codec && avctx->codec->close)
683
        avctx->codec->close(avctx);
684
    avcodec_default_free_buffers(avctx);
685
    av_freep(&avctx->priv_data);
686
    avctx->codec = NULL;
687
    entangled_thread_counter--;
688

    
689
    /* Release any user-supplied mutex. */
690
    if (ff_lockmgr_cb) {
691
        (*ff_lockmgr_cb)(&codec_mutex, AV_LOCK_RELEASE);
692
    }
693
    return 0;
694
}
695

    
696
AVCodec *avcodec_find_encoder(enum CodecID id)
697
{
698
    AVCodec *p;
699
    p = first_avcodec;
700
    while (p) {
701
        if (p->encode != NULL && p->id == id)
702
            return p;
703
        p = p->next;
704
    }
705
    return NULL;
706
}
707

    
708
AVCodec *avcodec_find_encoder_by_name(const char *name)
709
{
710
    AVCodec *p;
711
    if (!name)
712
        return NULL;
713
    p = first_avcodec;
714
    while (p) {
715
        if (p->encode != NULL && strcmp(name,p->name) == 0)
716
            return p;
717
        p = p->next;
718
    }
719
    return NULL;
720
}
721

    
722
AVCodec *avcodec_find_decoder(enum CodecID id)
723
{
724
    AVCodec *p;
725
    p = first_avcodec;
726
    while (p) {
727
        if (p->decode != NULL && p->id == id)
728
            return p;
729
        p = p->next;
730
    }
731
    return NULL;
732
}
733

    
734
AVCodec *avcodec_find_decoder_by_name(const char *name)
735
{
736
    AVCodec *p;
737
    if (!name)
738
        return NULL;
739
    p = first_avcodec;
740
    while (p) {
741
        if (p->decode != NULL && strcmp(name,p->name) == 0)
742
            return p;
743
        p = p->next;
744
    }
745
    return NULL;
746
}
747

    
748
int av_get_bit_rate(AVCodecContext *ctx)
749
{
750
    int bit_rate;
751
    int bits_per_sample;
752

    
753
    switch(ctx->codec_type) {
754
    case CODEC_TYPE_VIDEO:
755
        bit_rate = ctx->bit_rate;
756
        break;
757
    case CODEC_TYPE_AUDIO:
758
        bits_per_sample = av_get_bits_per_sample(ctx->codec_id);
759
        bit_rate = bits_per_sample ? ctx->sample_rate * ctx->channels * bits_per_sample : ctx->bit_rate;
760
        break;
761
    case CODEC_TYPE_DATA:
762
        bit_rate = ctx->bit_rate;
763
        break;
764
    case CODEC_TYPE_SUBTITLE:
765
        bit_rate = ctx->bit_rate;
766
        break;
767
    case CODEC_TYPE_ATTACHMENT:
768
        bit_rate = ctx->bit_rate;
769
        break;
770
    default:
771
        bit_rate = 0;
772
        break;
773
    }
774
    return bit_rate;
775
}
776

    
777
void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)
778
{
779
    const char *codec_name;
780
    AVCodec *p;
781
    char buf1[32];
782
    int bitrate;
783
    AVRational display_aspect_ratio;
784

    
785
    if (encode)
786
        p = avcodec_find_encoder(enc->codec_id);
787
    else
788
        p = avcodec_find_decoder(enc->codec_id);
789

    
790
    if (p) {
791
        codec_name = p->name;
792
    } else if (enc->codec_id == CODEC_ID_MPEG2TS) {
793
        /* fake mpeg2 transport stream codec (currently not
794
           registered) */
795
        codec_name = "mpeg2ts";
796
    } else if (enc->codec_name[0] != '\0') {
797
        codec_name = enc->codec_name;
798
    } else {
799
        /* output avi tags */
800
        if(   isprint(enc->codec_tag&0xFF) && isprint((enc->codec_tag>>8)&0xFF)
801
           && isprint((enc->codec_tag>>16)&0xFF) && isprint((enc->codec_tag>>24)&0xFF)){
802
            snprintf(buf1, sizeof(buf1), "%c%c%c%c / 0x%04X",
803
                     enc->codec_tag & 0xff,
804
                     (enc->codec_tag >> 8) & 0xff,
805
                     (enc->codec_tag >> 16) & 0xff,
806
                     (enc->codec_tag >> 24) & 0xff,
807
                      enc->codec_tag);
808
        } else {
809
            snprintf(buf1, sizeof(buf1), "0x%04x", enc->codec_tag);
810
        }
811
        codec_name = buf1;
812
    }
813

    
814
    switch(enc->codec_type) {
815
    case CODEC_TYPE_VIDEO:
816
        snprintf(buf, buf_size,
817
                 "Video: %s%s",
818
                 codec_name, enc->mb_decision ? " (hq)" : "");
819
        if (enc->pix_fmt != PIX_FMT_NONE) {
820
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
821
                     ", %s",
822
                     avcodec_get_pix_fmt_name(enc->pix_fmt));
823
        }
824
        if (enc->width) {
825
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
826
                     ", %dx%d",
827
                     enc->width, enc->height);
828
            if (enc->sample_aspect_ratio.num) {
829
                av_reduce(&display_aspect_ratio.num, &display_aspect_ratio.den,
830
                          enc->width*enc->sample_aspect_ratio.num,
831
                          enc->height*enc->sample_aspect_ratio.den,
832
                          1024*1024);
833
                snprintf(buf + strlen(buf), buf_size - strlen(buf),
834
                         " [PAR %d:%d DAR %d:%d]",
835
                         enc->sample_aspect_ratio.num, enc->sample_aspect_ratio.den,
836
                         display_aspect_ratio.num, display_aspect_ratio.den);
837
            }
838
            if(av_log_get_level() >= AV_LOG_DEBUG){
839
                int g= av_gcd(enc->time_base.num, enc->time_base.den);
840
                snprintf(buf + strlen(buf), buf_size - strlen(buf),
841
                     ", %d/%d",
842
                     enc->time_base.num/g, enc->time_base.den/g);
843
            }
844
        }
845
        if (encode) {
846
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
847
                     ", q=%d-%d", enc->qmin, enc->qmax);
848
        }
849
        break;
850
    case CODEC_TYPE_AUDIO:
851
        snprintf(buf, buf_size,
852
                 "Audio: %s",
853
                 codec_name);
854
        if (enc->sample_rate) {
855
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
856
                     ", %d Hz", enc->sample_rate);
857
        }
858
        av_strlcat(buf, ", ", buf_size);
859
        avcodec_get_channel_layout_string(buf + strlen(buf), buf_size - strlen(buf), enc->channels, enc->channel_layout);
860
        if (enc->sample_fmt != SAMPLE_FMT_NONE) {
861
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
862
                     ", %s", avcodec_get_sample_fmt_name(enc->sample_fmt));
863
        }
864
        break;
865
    case CODEC_TYPE_DATA:
866
        snprintf(buf, buf_size, "Data: %s", codec_name);
867
        break;
868
    case CODEC_TYPE_SUBTITLE:
869
        snprintf(buf, buf_size, "Subtitle: %s", codec_name);
870
        break;
871
    case CODEC_TYPE_ATTACHMENT:
872
        snprintf(buf, buf_size, "Attachment: %s", codec_name);
873
        break;
874
    default:
875
        snprintf(buf, buf_size, "Invalid Codec type %d", enc->codec_type);
876
        return;
877
    }
878
    if (encode) {
879
        if (enc->flags & CODEC_FLAG_PASS1)
880
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
881
                     ", pass 1");
882
        if (enc->flags & CODEC_FLAG_PASS2)
883
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
884
                     ", pass 2");
885
    }
886
    bitrate = av_get_bit_rate(enc);
887
    if (bitrate != 0) {
888
        snprintf(buf + strlen(buf), buf_size - strlen(buf),
889
                 ", %d kb/s", bitrate / 1000);
890
    }
891
}
892

    
893
unsigned avcodec_version( void )
894
{
895
  return LIBAVCODEC_VERSION_INT;
896
}
897

    
898
const char *avcodec_configuration(void)
899
{
900
    return FFMPEG_CONFIGURATION;
901
}
902

    
903
const char *avcodec_license(void)
904
{
905
#define LICENSE_PREFIX "libavcodec license: "
906
    return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;
907
}
908

    
909
void avcodec_init(void)
910
{
911
    static int initialized = 0;
912

    
913
    if (initialized != 0)
914
        return;
915
    initialized = 1;
916

    
917
    dsputil_static_init();
918
}
919

    
920
void avcodec_flush_buffers(AVCodecContext *avctx)
921
{
922
    if(avctx->codec->flush)
923
        avctx->codec->flush(avctx);
924
}
925

    
926
void avcodec_default_free_buffers(AVCodecContext *s){
927
    int i, j;
928

    
929
    if(s->internal_buffer==NULL) return;
930

    
931
    if (s->internal_buffer_count)
932
        av_log(s, AV_LOG_WARNING, "Found %i unreleased buffers!\n", s->internal_buffer_count);
933
    for(i=0; i<INTERNAL_BUFFER_SIZE; i++){
934
        InternalBuffer *buf= &((InternalBuffer*)s->internal_buffer)[i];
935
        for(j=0; j<4; j++){
936
            av_freep(&buf->base[j]);
937
            buf->data[j]= NULL;
938
        }
939
    }
940
    av_freep(&s->internal_buffer);
941

    
942
    s->internal_buffer_count=0;
943
}
944

    
945
char av_get_pict_type_char(int pict_type){
946
    switch(pict_type){
947
    case FF_I_TYPE: return 'I';
948
    case FF_P_TYPE: return 'P';
949
    case FF_B_TYPE: return 'B';
950
    case FF_S_TYPE: return 'S';
951
    case FF_SI_TYPE:return 'i';
952
    case FF_SP_TYPE:return 'p';
953
    case FF_BI_TYPE:return 'b';
954
    default:        return '?';
955
    }
956
}
957

    
958
int av_get_bits_per_sample(enum CodecID codec_id){
959
    switch(codec_id){
960
    case CODEC_ID_ADPCM_SBPRO_2:
961
        return 2;
962
    case CODEC_ID_ADPCM_SBPRO_3:
963
        return 3;
964
    case CODEC_ID_ADPCM_SBPRO_4:
965
    case CODEC_ID_ADPCM_CT:
966
    case CODEC_ID_ADPCM_IMA_WAV:
967
    case CODEC_ID_ADPCM_MS:
968
    case CODEC_ID_ADPCM_YAMAHA:
969
        return 4;
970
    case CODEC_ID_PCM_ALAW:
971
    case CODEC_ID_PCM_MULAW:
972
    case CODEC_ID_PCM_S8:
973
    case CODEC_ID_PCM_U8:
974
    case CODEC_ID_PCM_ZORK:
975
        return 8;
976
    case CODEC_ID_PCM_S16BE:
977
    case CODEC_ID_PCM_S16LE:
978
    case CODEC_ID_PCM_S16LE_PLANAR:
979
    case CODEC_ID_PCM_U16BE:
980
    case CODEC_ID_PCM_U16LE:
981
        return 16;
982
    case CODEC_ID_PCM_S24DAUD:
983
    case CODEC_ID_PCM_S24BE:
984
    case CODEC_ID_PCM_S24LE:
985
    case CODEC_ID_PCM_U24BE:
986
    case CODEC_ID_PCM_U24LE:
987
        return 24;
988
    case CODEC_ID_PCM_S32BE:
989
    case CODEC_ID_PCM_S32LE:
990
    case CODEC_ID_PCM_U32BE:
991
    case CODEC_ID_PCM_U32LE:
992
    case CODEC_ID_PCM_F32BE:
993
    case CODEC_ID_PCM_F32LE:
994
        return 32;
995
    case CODEC_ID_PCM_F64BE:
996
    case CODEC_ID_PCM_F64LE:
997
        return 64;
998
    default:
999
        return 0;
1000
    }
1001
}
1002

    
1003
int av_get_bits_per_sample_format(enum SampleFormat sample_fmt) {
1004
    switch (sample_fmt) {
1005
    case SAMPLE_FMT_U8:
1006
        return 8;
1007
    case SAMPLE_FMT_S16:
1008
        return 16;
1009
    case SAMPLE_FMT_S32:
1010
    case SAMPLE_FMT_FLT:
1011
        return 32;
1012
    case SAMPLE_FMT_DBL:
1013
        return 64;
1014
    default:
1015
        return 0;
1016
    }
1017
}
1018

    
1019
#if !HAVE_THREADS
1020
int avcodec_thread_init(AVCodecContext *s, int thread_count){
1021
    s->thread_count = thread_count;
1022
    return -1;
1023
}
1024
#endif
1025

    
1026
unsigned int av_xiphlacing(unsigned char *s, unsigned int v)
1027
{
1028
    unsigned int n = 0;
1029

    
1030
    while(v >= 0xff) {
1031
        *s++ = 0xff;
1032
        v -= 0xff;
1033
        n++;
1034
    }
1035
    *s = v;
1036
    n++;
1037
    return n;
1038
}
1039

    
1040
/* Wrapper to work around the lack of mkstemp() on mingw/cygin.
1041
 * Also, tries to create file in /tmp first, if possible.
1042
 * *prefix can be a character constant; *filename will be allocated internally.
1043
 * Returns file descriptor of opened file (or -1 on error)
1044
 * and opened file name in **filename. */
1045
int av_tempfile(char *prefix, char **filename) {
1046
    int fd=-1;
1047
#if !HAVE_MKSTEMP
1048
    *filename = tempnam(".", prefix);
1049
#else
1050
    size_t len = strlen(prefix) + 12; /* room for "/tmp/" and "XXXXXX\0" */
1051
    *filename = av_malloc(len);
1052
#endif
1053
    /* -----common section-----*/
1054
    if (*filename == NULL) {
1055
        av_log(NULL, AV_LOG_ERROR, "ff_tempfile: Cannot allocate file name\n");
1056
        return -1;
1057
    }
1058
#if !HAVE_MKSTEMP
1059
    fd = open(*filename, O_RDWR | O_BINARY | O_CREAT, 0444);
1060
#else
1061
    snprintf(*filename, len, "/tmp/%sXXXXXX", prefix);
1062
    fd = mkstemp(*filename);
1063
    if (fd < 0) {
1064
        snprintf(*filename, len, "./%sXXXXXX", prefix);
1065
        fd = mkstemp(*filename);
1066
    }
1067
#endif
1068
    /* -----common section-----*/
1069
    if (fd < 0) {
1070
        av_log(NULL, AV_LOG_ERROR, "ff_tempfile: Cannot open temporary file %s\n", *filename);
1071
        return -1;
1072
    }
1073
    return fd; /* success */
1074
}
1075

    
1076
typedef struct {
1077
    const char *abbr;
1078
    int width, height;
1079
} VideoFrameSizeAbbr;
1080

    
1081
typedef struct {
1082
    const char *abbr;
1083
    int rate_num, rate_den;
1084
} VideoFrameRateAbbr;
1085

    
1086
static const VideoFrameSizeAbbr video_frame_size_abbrs[] = {
1087
    { "ntsc",      720, 480 },
1088
    { "pal",       720, 576 },
1089
    { "qntsc",     352, 240 }, /* VCD compliant NTSC */
1090
    { "qpal",      352, 288 }, /* VCD compliant PAL */
1091
    { "sntsc",     640, 480 }, /* square pixel NTSC */
1092
    { "spal",      768, 576 }, /* square pixel PAL */
1093
    { "film",      352, 240 },
1094
    { "ntsc-film", 352, 240 },
1095
    { "sqcif",     128,  96 },
1096
    { "qcif",      176, 144 },
1097
    { "cif",       352, 288 },
1098
    { "4cif",      704, 576 },
1099
    { "16cif",    1408,1152 },
1100
    { "qqvga",     160, 120 },
1101
    { "qvga",      320, 240 },
1102
    { "vga",       640, 480 },
1103
    { "svga",      800, 600 },
1104
    { "xga",      1024, 768 },
1105
    { "uxga",     1600,1200 },
1106
    { "qxga",     2048,1536 },
1107
    { "sxga",     1280,1024 },
1108
    { "qsxga",    2560,2048 },
1109
    { "hsxga",    5120,4096 },
1110
    { "wvga",      852, 480 },
1111
    { "wxga",     1366, 768 },
1112
    { "wsxga",    1600,1024 },
1113
    { "wuxga",    1920,1200 },
1114
    { "woxga",    2560,1600 },
1115
    { "wqsxga",   3200,2048 },
1116
    { "wquxga",   3840,2400 },
1117
    { "whsxga",   6400,4096 },
1118
    { "whuxga",   7680,4800 },
1119
    { "cga",       320, 200 },
1120
    { "ega",       640, 350 },
1121
    { "hd480",     852, 480 },
1122
    { "hd720",    1280, 720 },
1123
    { "hd1080",   1920,1080 },
1124
};
1125

    
1126
static const VideoFrameRateAbbr video_frame_rate_abbrs[]= {
1127
    { "ntsc",      30000, 1001 },
1128
    { "pal",          25,    1 },
1129
    { "qntsc",     30000, 1001 }, /* VCD compliant NTSC */
1130
    { "qpal",         25,    1 }, /* VCD compliant PAL */
1131
    { "sntsc",     30000, 1001 }, /* square pixel NTSC */
1132
    { "spal",         25,    1 }, /* square pixel PAL */
1133
    { "film",         24,    1 },
1134
    { "ntsc-film", 24000, 1001 },
1135
};
1136

    
1137
int av_parse_video_frame_size(int *width_ptr, int *height_ptr, const char *str)
1138
{
1139
    int i;
1140
    int n = FF_ARRAY_ELEMS(video_frame_size_abbrs);
1141
    char *p;
1142
    int frame_width = 0, frame_height = 0;
1143

    
1144
    for(i=0;i<n;i++) {
1145
        if (!strcmp(video_frame_size_abbrs[i].abbr, str)) {
1146
            frame_width = video_frame_size_abbrs[i].width;
1147
            frame_height = video_frame_size_abbrs[i].height;
1148
            break;
1149
        }
1150
    }
1151
    if (i == n) {
1152
        p = str;
1153
        frame_width = strtol(p, &p, 10);
1154
        if (*p)
1155
            p++;
1156
        frame_height = strtol(p, &p, 10);
1157
    }
1158
    if (frame_width <= 0 || frame_height <= 0)
1159
        return -1;
1160
    *width_ptr = frame_width;
1161
    *height_ptr = frame_height;
1162
    return 0;
1163
}
1164

    
1165
int av_parse_video_frame_rate(AVRational *frame_rate, const char *arg)
1166
{
1167
    int i;
1168
    int n = FF_ARRAY_ELEMS(video_frame_rate_abbrs);
1169
    char* cp;
1170

    
1171
    /* First, we check our abbreviation table */
1172
    for (i = 0; i < n; ++i)
1173
         if (!strcmp(video_frame_rate_abbrs[i].abbr, arg)) {
1174
             frame_rate->num = video_frame_rate_abbrs[i].rate_num;
1175
             frame_rate->den = video_frame_rate_abbrs[i].rate_den;
1176
             return 0;
1177
         }
1178

    
1179
    /* Then, we try to parse it as fraction */
1180
    cp = strchr(arg, '/');
1181
    if (!cp)
1182
        cp = strchr(arg, ':');
1183
    if (cp) {
1184
        char* cpp;
1185
        frame_rate->num = strtol(arg, &cpp, 10);
1186
        if (cpp != arg || cpp == cp)
1187
            frame_rate->den = strtol(cp+1, &cpp, 10);
1188
        else
1189
           frame_rate->num = 0;
1190
    }
1191
    else {
1192
        /* Finally we give up and parse it as double */
1193
        AVRational time_base = av_d2q(strtod(arg, 0), 1001000);
1194
        frame_rate->den = time_base.den;
1195
        frame_rate->num = time_base.num;
1196
    }
1197
    if (!frame_rate->num || !frame_rate->den)
1198
        return -1;
1199
    else
1200
        return 0;
1201
}
1202

    
1203
int ff_match_2uint16(const uint16_t (*tab)[2], int size, int a, int b){
1204
    int i;
1205
    for(i=0; i<size && !(tab[i][0]==a && tab[i][1]==b); i++);
1206
    return i;
1207
}
1208

    
1209
void av_log_missing_feature(void *avc, const char *feature, int want_sample)
1210
{
1211
    av_log(avc, AV_LOG_WARNING, "%s not implemented. Update your FFmpeg "
1212
            "version to the newest one from SVN. If the problem still "
1213
            "occurs, it means that your file has a feature which has not "
1214
            "been implemented.", feature);
1215
    if(want_sample)
1216
        av_log_ask_for_sample(avc, NULL);
1217
    else
1218
        av_log(avc, AV_LOG_WARNING, "\n");
1219
}
1220

    
1221
void av_log_ask_for_sample(void *avc, const char *msg)
1222
{
1223
    if (msg)
1224
        av_log(avc, AV_LOG_WARNING, "%s ", msg);
1225
    av_log(avc, AV_LOG_WARNING, "If you want to help, upload a sample "
1226
            "of this file to ftp://upload.ffmpeg.org/MPlayer/incoming/ "
1227
            "and contact the ffmpeg-devel mailing list.\n");
1228
}
1229

    
1230
static AVHWAccel *first_hwaccel = NULL;
1231

    
1232
void av_register_hwaccel(AVHWAccel *hwaccel)
1233
{
1234
    AVHWAccel **p = &first_hwaccel;
1235
    while (*p)
1236
        p = &(*p)->next;
1237
    *p = hwaccel;
1238
    hwaccel->next = NULL;
1239
}
1240

    
1241
AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel)
1242
{
1243
    return hwaccel ? hwaccel->next : first_hwaccel;
1244
}
1245

    
1246
AVHWAccel *ff_find_hwaccel(enum CodecID codec_id, enum PixelFormat pix_fmt)
1247
{
1248
    AVHWAccel *hwaccel=NULL;
1249

    
1250
    while((hwaccel= av_hwaccel_next(hwaccel))){
1251
        if (   hwaccel->id      == codec_id
1252
            && hwaccel->pix_fmt == pix_fmt)
1253
            return hwaccel;
1254
    }
1255
    return NULL;
1256
}
1257

    
1258
int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op))
1259
{
1260
    if (ff_lockmgr_cb) {
1261
        if (ff_lockmgr_cb(&codec_mutex, AV_LOCK_DESTROY))
1262
            return -1;
1263
    }
1264

    
1265
    ff_lockmgr_cb = cb;
1266

    
1267
    if (ff_lockmgr_cb) {
1268
        if (ff_lockmgr_cb(&codec_mutex, AV_LOCK_CREATE))
1269
            return -1;
1270
    }
1271
    return 0;
1272
}