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ffmpeg / libavcodec / utils.c @ 98c82d69

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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
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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
        return 0;
372

    
373
    /*
374
     * Not internal type and reget_buffer not overridden, emulate cr buffer
375
     */
376
    temp_pic = *pic;
377
    for(i = 0; i < 4; i++)
378
        pic->data[i] = pic->base[i] = NULL;
379
    pic->opaque = NULL;
380
    /* Allocate new frame */
381
    if (s->get_buffer(s, pic))
382
        return -1;
383
    /* Copy image data from old buffer to new buffer */
384
    av_picture_copy((AVPicture*)pic, (AVPicture*)&temp_pic, s->pix_fmt, s->width,
385
             s->height);
386
    s->release_buffer(s, &temp_pic); // Release old frame
387
    return 0;
388
}
389

    
390
int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size){
391
    int i;
392

    
393
    for(i=0; i<count; i++){
394
        int r= func(c, (char*)arg + i*size);
395
        if(ret) ret[i]= r;
396
    }
397
    return 0;
398
}
399

    
400
int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int jobnr, int threadnr),void *arg, int *ret, int count){
401
    int i;
402

    
403
    for(i=0; i<count; i++){
404
        int r= func(c, arg, i, 0);
405
        if(ret) ret[i]= r;
406
    }
407
    return 0;
408
}
409

    
410
enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat *fmt){
411
    while (*fmt != PIX_FMT_NONE && ff_is_hwaccel_pix_fmt(*fmt))
412
        ++fmt;
413
    return fmt[0];
414
}
415

    
416
void avcodec_get_frame_defaults(AVFrame *pic){
417
    memset(pic, 0, sizeof(AVFrame));
418

    
419
    pic->pts= AV_NOPTS_VALUE;
420
    pic->key_frame= 1;
421
}
422

    
423
AVFrame *avcodec_alloc_frame(void){
424
    AVFrame *pic= av_malloc(sizeof(AVFrame));
425

    
426
    if(pic==NULL) return NULL;
427

    
428
    avcodec_get_frame_defaults(pic);
429

    
430
    return pic;
431
}
432

    
433
int attribute_align_arg avcodec_open(AVCodecContext *avctx, AVCodec *codec)
434
{
435
    int ret= -1;
436

    
437
    /* If there is a user-supplied mutex locking routine, call it. */
438
    if (ff_lockmgr_cb) {
439
        if ((*ff_lockmgr_cb)(&codec_mutex, AV_LOCK_OBTAIN))
440
            return -1;
441
    }
442

    
443
    entangled_thread_counter++;
444
    if(entangled_thread_counter != 1){
445
        av_log(avctx, AV_LOG_ERROR, "insufficient thread locking around avcodec_open/close()\n");
446
        goto end;
447
    }
448

    
449
    if(avctx->codec || !codec)
450
        goto end;
451

    
452
    if (codec->priv_data_size > 0) {
453
        avctx->priv_data = av_mallocz(codec->priv_data_size);
454
        if (!avctx->priv_data) {
455
            ret = AVERROR(ENOMEM);
456
            goto end;
457
        }
458
    } else {
459
        avctx->priv_data = NULL;
460
    }
461

    
462
    if(avctx->coded_width && avctx->coded_height)
463
        avcodec_set_dimensions(avctx, avctx->coded_width, avctx->coded_height);
464
    else if(avctx->width && avctx->height)
465
        avcodec_set_dimensions(avctx, avctx->width, avctx->height);
466

    
467
#define SANE_NB_CHANNELS 128U
468
    if (((avctx->coded_width || avctx->coded_height)
469
        && avcodec_check_dimensions(avctx, avctx->coded_width, avctx->coded_height))
470
        || avctx->channels > SANE_NB_CHANNELS) {
471
        ret = AVERROR(EINVAL);
472
        goto free_and_end;
473
    }
474

    
475
    avctx->codec = codec;
476
    if ((avctx->codec_type == CODEC_TYPE_UNKNOWN || avctx->codec_type == codec->type) &&
477
        avctx->codec_id == CODEC_ID_NONE) {
478
        avctx->codec_type = codec->type;
479
        avctx->codec_id   = codec->id;
480
    }
481
    if(avctx->codec_id != codec->id || avctx->codec_type != codec->type){
482
        av_log(avctx, AV_LOG_ERROR, "codec type or id mismatches\n");
483
        goto free_and_end;
484
    }
485
    avctx->frame_number = 0;
486
    if(avctx->codec->init){
487
        ret = avctx->codec->init(avctx);
488
        if (ret < 0) {
489
            goto free_and_end;
490
        }
491
    }
492
    ret=0;
493
end:
494
    entangled_thread_counter--;
495

    
496
    /* Release any user-supplied mutex. */
497
    if (ff_lockmgr_cb) {
498
        (*ff_lockmgr_cb)(&codec_mutex, AV_LOCK_RELEASE);
499
    }
500
    return ret;
501
free_and_end:
502
    av_freep(&avctx->priv_data);
503
    avctx->codec= NULL;
504
    goto end;
505
}
506

    
507
int attribute_align_arg avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size,
508
                         const short *samples)
509
{
510
    if(buf_size < FF_MIN_BUFFER_SIZE && 0){
511
        av_log(avctx, AV_LOG_ERROR, "buffer smaller than minimum size\n");
512
        return -1;
513
    }
514
    if((avctx->codec->capabilities & CODEC_CAP_DELAY) || samples){
515
        int ret = avctx->codec->encode(avctx, buf, buf_size, samples);
516
        avctx->frame_number++;
517
        return ret;
518
    }else
519
        return 0;
520
}
521

    
522
int attribute_align_arg avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
523
                         const AVFrame *pict)
524
{
525
    if(buf_size < FF_MIN_BUFFER_SIZE){
526
        av_log(avctx, AV_LOG_ERROR, "buffer smaller than minimum size\n");
527
        return -1;
528
    }
529
    if(avcodec_check_dimensions(avctx,avctx->width,avctx->height))
530
        return -1;
531
    if((avctx->codec->capabilities & CODEC_CAP_DELAY) || pict){
532
        int ret = avctx->codec->encode(avctx, buf, buf_size, pict);
533
        avctx->frame_number++;
534
        emms_c(); //needed to avoid an emms_c() call before every return;
535

    
536
        return ret;
537
    }else
538
        return 0;
539
}
540

    
541
int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
542
                            const AVSubtitle *sub)
543
{
544
    int ret;
545
    if(sub->start_display_time) {
546
        av_log(avctx, AV_LOG_ERROR, "start_display_time must be 0.\n");
547
        return -1;
548
    }
549
    if(sub->num_rects == 0 || !sub->rects)
550
        return -1;
551
    ret = avctx->codec->encode(avctx, buf, buf_size, sub);
552
    avctx->frame_number++;
553
    return ret;
554
}
555

    
556
#if LIBAVCODEC_VERSION_MAJOR < 53
557
int attribute_align_arg avcodec_decode_video(AVCodecContext *avctx, AVFrame *picture,
558
                         int *got_picture_ptr,
559
                         const uint8_t *buf, int buf_size)
560
{
561
    AVPacket avpkt;
562
    av_init_packet(&avpkt);
563
    avpkt.data = buf;
564
    avpkt.size = buf_size;
565
    // HACK for CorePNG to decode as normal PNG by default
566
    avpkt.flags = AV_PKT_FLAG_KEY;
567

    
568
    return avcodec_decode_video2(avctx, picture, got_picture_ptr, &avpkt);
569
}
570
#endif
571

    
572
int attribute_align_arg avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
573
                         int *got_picture_ptr,
574
                         AVPacket *avpkt)
575
{
576
    int ret;
577

    
578
    *got_picture_ptr= 0;
579
    if((avctx->coded_width||avctx->coded_height) && avcodec_check_dimensions(avctx,avctx->coded_width,avctx->coded_height))
580
        return -1;
581
    if((avctx->codec->capabilities & CODEC_CAP_DELAY) || avpkt->size){
582
        ret = avctx->codec->decode(avctx, picture, got_picture_ptr,
583
                                avpkt);
584

    
585
        emms_c(); //needed to avoid an emms_c() call before every return;
586

    
587
        if (*got_picture_ptr)
588
            avctx->frame_number++;
589
    }else
590
        ret= 0;
591

    
592
    return ret;
593
}
594

    
595
#if LIBAVCODEC_VERSION_MAJOR < 53
596
int attribute_align_arg avcodec_decode_audio2(AVCodecContext *avctx, int16_t *samples,
597
                         int *frame_size_ptr,
598
                         const uint8_t *buf, int buf_size)
599
{
600
    AVPacket avpkt;
601
    av_init_packet(&avpkt);
602
    avpkt.data = buf;
603
    avpkt.size = buf_size;
604

    
605
    return avcodec_decode_audio3(avctx, samples, frame_size_ptr, &avpkt);
606
}
607
#endif
608

    
609
int attribute_align_arg avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples,
610
                         int *frame_size_ptr,
611
                         AVPacket *avpkt)
612
{
613
    int ret;
614

    
615
    if((avctx->codec->capabilities & CODEC_CAP_DELAY) || avpkt->size){
616
        //FIXME remove the check below _after_ ensuring that all audio check that the available space is enough
617
        if(*frame_size_ptr < AVCODEC_MAX_AUDIO_FRAME_SIZE){
618
            av_log(avctx, AV_LOG_ERROR, "buffer smaller than AVCODEC_MAX_AUDIO_FRAME_SIZE\n");
619
            return -1;
620
        }
621
        if(*frame_size_ptr < FF_MIN_BUFFER_SIZE ||
622
        *frame_size_ptr < avctx->channels * avctx->frame_size * sizeof(int16_t)){
623
            av_log(avctx, AV_LOG_ERROR, "buffer %d too small\n", *frame_size_ptr);
624
            return -1;
625
        }
626

    
627
        ret = avctx->codec->decode(avctx, samples, frame_size_ptr, avpkt);
628
        avctx->frame_number++;
629
    }else{
630
        ret= 0;
631
        *frame_size_ptr=0;
632
    }
633
    return ret;
634
}
635

    
636
#if LIBAVCODEC_VERSION_MAJOR < 53
637
int avcodec_decode_subtitle(AVCodecContext *avctx, AVSubtitle *sub,
638
                            int *got_sub_ptr,
639
                            const uint8_t *buf, int buf_size)
640
{
641
    AVPacket avpkt;
642
    av_init_packet(&avpkt);
643
    avpkt.data = buf;
644
    avpkt.size = buf_size;
645

    
646
    return avcodec_decode_subtitle2(avctx, sub, got_sub_ptr, &avpkt);
647
}
648
#endif
649

    
650
int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
651
                            int *got_sub_ptr,
652
                            AVPacket *avpkt)
653
{
654
    int ret;
655

    
656
    *got_sub_ptr = 0;
657
    ret = avctx->codec->decode(avctx, sub, got_sub_ptr, avpkt);
658
    if (*got_sub_ptr)
659
        avctx->frame_number++;
660
    return ret;
661
}
662

    
663
int avcodec_close(AVCodecContext *avctx)
664
{
665
    /* If there is a user-supplied mutex locking routine, call it. */
666
    if (ff_lockmgr_cb) {
667
        if ((*ff_lockmgr_cb)(&codec_mutex, AV_LOCK_OBTAIN))
668
            return -1;
669
    }
670

    
671
    entangled_thread_counter++;
672
    if(entangled_thread_counter != 1){
673
        av_log(avctx, AV_LOG_ERROR, "insufficient thread locking around avcodec_open/close()\n");
674
        entangled_thread_counter--;
675
        return -1;
676
    }
677

    
678
    if (HAVE_THREADS && avctx->thread_opaque)
679
        avcodec_thread_free(avctx);
680
    if (avctx->codec && avctx->codec->close)
681
        avctx->codec->close(avctx);
682
    avcodec_default_free_buffers(avctx);
683
    av_freep(&avctx->priv_data);
684
    avctx->codec = NULL;
685
    entangled_thread_counter--;
686

    
687
    /* Release any user-supplied mutex. */
688
    if (ff_lockmgr_cb) {
689
        (*ff_lockmgr_cb)(&codec_mutex, AV_LOCK_RELEASE);
690
    }
691
    return 0;
692
}
693

    
694
AVCodec *avcodec_find_encoder(enum CodecID id)
695
{
696
    AVCodec *p;
697
    p = first_avcodec;
698
    while (p) {
699
        if (p->encode != NULL && p->id == id)
700
            return p;
701
        p = p->next;
702
    }
703
    return NULL;
704
}
705

    
706
AVCodec *avcodec_find_encoder_by_name(const char *name)
707
{
708
    AVCodec *p;
709
    if (!name)
710
        return NULL;
711
    p = first_avcodec;
712
    while (p) {
713
        if (p->encode != NULL && strcmp(name,p->name) == 0)
714
            return p;
715
        p = p->next;
716
    }
717
    return NULL;
718
}
719

    
720
AVCodec *avcodec_find_decoder(enum CodecID id)
721
{
722
    AVCodec *p;
723
    p = first_avcodec;
724
    while (p) {
725
        if (p->decode != NULL && p->id == id)
726
            return p;
727
        p = p->next;
728
    }
729
    return NULL;
730
}
731

    
732
AVCodec *avcodec_find_decoder_by_name(const char *name)
733
{
734
    AVCodec *p;
735
    if (!name)
736
        return NULL;
737
    p = first_avcodec;
738
    while (p) {
739
        if (p->decode != NULL && strcmp(name,p->name) == 0)
740
            return p;
741
        p = p->next;
742
    }
743
    return NULL;
744
}
745

    
746
void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)
747
{
748
    const char *codec_name;
749
    AVCodec *p;
750
    char buf1[32];
751
    int bitrate;
752
    AVRational display_aspect_ratio;
753

    
754
    if (encode)
755
        p = avcodec_find_encoder(enc->codec_id);
756
    else
757
        p = avcodec_find_decoder(enc->codec_id);
758

    
759
    if (p) {
760
        codec_name = p->name;
761
    } else if (enc->codec_id == CODEC_ID_MPEG2TS) {
762
        /* fake mpeg2 transport stream codec (currently not
763
           registered) */
764
        codec_name = "mpeg2ts";
765
    } else if (enc->codec_name[0] != '\0') {
766
        codec_name = enc->codec_name;
767
    } else {
768
        /* output avi tags */
769
        if(   isprint(enc->codec_tag&0xFF) && isprint((enc->codec_tag>>8)&0xFF)
770
           && isprint((enc->codec_tag>>16)&0xFF) && isprint((enc->codec_tag>>24)&0xFF)){
771
            snprintf(buf1, sizeof(buf1), "%c%c%c%c / 0x%04X",
772
                     enc->codec_tag & 0xff,
773
                     (enc->codec_tag >> 8) & 0xff,
774
                     (enc->codec_tag >> 16) & 0xff,
775
                     (enc->codec_tag >> 24) & 0xff,
776
                      enc->codec_tag);
777
        } else {
778
            snprintf(buf1, sizeof(buf1), "0x%04x", enc->codec_tag);
779
        }
780
        codec_name = buf1;
781
    }
782

    
783
    switch(enc->codec_type) {
784
    case CODEC_TYPE_VIDEO:
785
        snprintf(buf, buf_size,
786
                 "Video: %s%s",
787
                 codec_name, enc->mb_decision ? " (hq)" : "");
788
        if (enc->pix_fmt != PIX_FMT_NONE) {
789
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
790
                     ", %s",
791
                     avcodec_get_pix_fmt_name(enc->pix_fmt));
792
        }
793
        if (enc->width) {
794
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
795
                     ", %dx%d",
796
                     enc->width, enc->height);
797
            if (enc->sample_aspect_ratio.num) {
798
                av_reduce(&display_aspect_ratio.num, &display_aspect_ratio.den,
799
                          enc->width*enc->sample_aspect_ratio.num,
800
                          enc->height*enc->sample_aspect_ratio.den,
801
                          1024*1024);
802
                snprintf(buf + strlen(buf), buf_size - strlen(buf),
803
                         " [PAR %d:%d DAR %d:%d]",
804
                         enc->sample_aspect_ratio.num, enc->sample_aspect_ratio.den,
805
                         display_aspect_ratio.num, display_aspect_ratio.den);
806
            }
807
            if(av_log_get_level() >= AV_LOG_DEBUG){
808
                int g= av_gcd(enc->time_base.num, enc->time_base.den);
809
                snprintf(buf + strlen(buf), buf_size - strlen(buf),
810
                     ", %d/%d",
811
                     enc->time_base.num/g, enc->time_base.den/g);
812
            }
813
        }
814
        if (encode) {
815
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
816
                     ", q=%d-%d", enc->qmin, enc->qmax);
817
        }
818
        bitrate = enc->bit_rate;
819
        break;
820
    case CODEC_TYPE_AUDIO:
821
        snprintf(buf, buf_size,
822
                 "Audio: %s",
823
                 codec_name);
824
        if (enc->sample_rate) {
825
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
826
                     ", %d Hz", enc->sample_rate);
827
        }
828
        av_strlcat(buf, ", ", buf_size);
829
        avcodec_get_channel_layout_string(buf + strlen(buf), buf_size - strlen(buf), enc->channels, enc->channel_layout);
830
        if (enc->sample_fmt != SAMPLE_FMT_NONE) {
831
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
832
                     ", %s", avcodec_get_sample_fmt_name(enc->sample_fmt));
833
        }
834

    
835
        /* for PCM codecs, compute bitrate directly */
836
        switch(enc->codec_id) {
837
        case CODEC_ID_PCM_F64BE:
838
        case CODEC_ID_PCM_F64LE:
839
            bitrate = enc->sample_rate * enc->channels * 64;
840
            break;
841
        case CODEC_ID_PCM_S32LE:
842
        case CODEC_ID_PCM_S32BE:
843
        case CODEC_ID_PCM_U32LE:
844
        case CODEC_ID_PCM_U32BE:
845
        case CODEC_ID_PCM_F32BE:
846
        case CODEC_ID_PCM_F32LE:
847
            bitrate = enc->sample_rate * enc->channels * 32;
848
            break;
849
        case CODEC_ID_PCM_S24LE:
850
        case CODEC_ID_PCM_S24BE:
851
        case CODEC_ID_PCM_U24LE:
852
        case CODEC_ID_PCM_U24BE:
853
        case CODEC_ID_PCM_S24DAUD:
854
            bitrate = enc->sample_rate * enc->channels * 24;
855
            break;
856
        case CODEC_ID_PCM_S16LE:
857
        case CODEC_ID_PCM_S16BE:
858
        case CODEC_ID_PCM_S16LE_PLANAR:
859
        case CODEC_ID_PCM_U16LE:
860
        case CODEC_ID_PCM_U16BE:
861
            bitrate = enc->sample_rate * enc->channels * 16;
862
            break;
863
        case CODEC_ID_PCM_S8:
864
        case CODEC_ID_PCM_U8:
865
        case CODEC_ID_PCM_ALAW:
866
        case CODEC_ID_PCM_MULAW:
867
        case CODEC_ID_PCM_ZORK:
868
            bitrate = enc->sample_rate * enc->channels * 8;
869
            break;
870
        default:
871
            bitrate = enc->bit_rate;
872
            break;
873
        }
874
        break;
875
    case CODEC_TYPE_DATA:
876
        snprintf(buf, buf_size, "Data: %s", codec_name);
877
        bitrate = enc->bit_rate;
878
        break;
879
    case CODEC_TYPE_SUBTITLE:
880
        snprintf(buf, buf_size, "Subtitle: %s", codec_name);
881
        bitrate = enc->bit_rate;
882
        break;
883
    case CODEC_TYPE_ATTACHMENT:
884
        snprintf(buf, buf_size, "Attachment: %s", codec_name);
885
        bitrate = enc->bit_rate;
886
        break;
887
    default:
888
        snprintf(buf, buf_size, "Invalid Codec type %d", enc->codec_type);
889
        return;
890
    }
891
    if (encode) {
892
        if (enc->flags & CODEC_FLAG_PASS1)
893
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
894
                     ", pass 1");
895
        if (enc->flags & CODEC_FLAG_PASS2)
896
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
897
                     ", pass 2");
898
    }
899
    if (bitrate != 0) {
900
        snprintf(buf + strlen(buf), buf_size - strlen(buf),
901
                 ", %d kb/s", bitrate / 1000);
902
    }
903
}
904

    
905
unsigned avcodec_version( void )
906
{
907
  return LIBAVCODEC_VERSION_INT;
908
}
909

    
910
const char * avcodec_configuration(void)
911
{
912
    return FFMPEG_CONFIGURATION;
913
}
914

    
915
const char * avcodec_license(void)
916
{
917
#define LICENSE_PREFIX "libavcodec license: "
918
    return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;
919
}
920

    
921
void avcodec_init(void)
922
{
923
    static int initialized = 0;
924

    
925
    if (initialized != 0)
926
        return;
927
    initialized = 1;
928

    
929
    dsputil_static_init();
930
}
931

    
932
void avcodec_flush_buffers(AVCodecContext *avctx)
933
{
934
    if(avctx->codec->flush)
935
        avctx->codec->flush(avctx);
936
}
937

    
938
void avcodec_default_free_buffers(AVCodecContext *s){
939
    int i, j;
940

    
941
    if(s->internal_buffer==NULL) return;
942

    
943
    if (s->internal_buffer_count)
944
        av_log(s, AV_LOG_WARNING, "Found %i unreleased buffers!\n", s->internal_buffer_count);
945
    for(i=0; i<INTERNAL_BUFFER_SIZE; i++){
946
        InternalBuffer *buf= &((InternalBuffer*)s->internal_buffer)[i];
947
        for(j=0; j<4; j++){
948
            av_freep(&buf->base[j]);
949
            buf->data[j]= NULL;
950
        }
951
    }
952
    av_freep(&s->internal_buffer);
953

    
954
    s->internal_buffer_count=0;
955
}
956

    
957
char av_get_pict_type_char(int pict_type){
958
    switch(pict_type){
959
    case FF_I_TYPE: return 'I';
960
    case FF_P_TYPE: return 'P';
961
    case FF_B_TYPE: return 'B';
962
    case FF_S_TYPE: return 'S';
963
    case FF_SI_TYPE:return 'i';
964
    case FF_SP_TYPE:return 'p';
965
    case FF_BI_TYPE:return 'b';
966
    default:        return '?';
967
    }
968
}
969

    
970
int av_get_bits_per_sample(enum CodecID codec_id){
971
    switch(codec_id){
972
    case CODEC_ID_ADPCM_SBPRO_2:
973
        return 2;
974
    case CODEC_ID_ADPCM_SBPRO_3:
975
        return 3;
976
    case CODEC_ID_ADPCM_SBPRO_4:
977
    case CODEC_ID_ADPCM_CT:
978
        return 4;
979
    case CODEC_ID_PCM_ALAW:
980
    case CODEC_ID_PCM_MULAW:
981
    case CODEC_ID_PCM_S8:
982
    case CODEC_ID_PCM_U8:
983
    case CODEC_ID_PCM_ZORK:
984
        return 8;
985
    case CODEC_ID_PCM_S16BE:
986
    case CODEC_ID_PCM_S16LE:
987
    case CODEC_ID_PCM_S16LE_PLANAR:
988
    case CODEC_ID_PCM_U16BE:
989
    case CODEC_ID_PCM_U16LE:
990
        return 16;
991
    case CODEC_ID_PCM_S24DAUD:
992
    case CODEC_ID_PCM_S24BE:
993
    case CODEC_ID_PCM_S24LE:
994
    case CODEC_ID_PCM_U24BE:
995
    case CODEC_ID_PCM_U24LE:
996
        return 24;
997
    case CODEC_ID_PCM_S32BE:
998
    case CODEC_ID_PCM_S32LE:
999
    case CODEC_ID_PCM_U32BE:
1000
    case CODEC_ID_PCM_U32LE:
1001
    case CODEC_ID_PCM_F32BE:
1002
    case CODEC_ID_PCM_F32LE:
1003
        return 32;
1004
    case CODEC_ID_PCM_F64BE:
1005
    case CODEC_ID_PCM_F64LE:
1006
        return 64;
1007
    default:
1008
        return 0;
1009
    }
1010
}
1011

    
1012
int av_get_bits_per_sample_format(enum SampleFormat sample_fmt) {
1013
    switch (sample_fmt) {
1014
    case SAMPLE_FMT_U8:
1015
        return 8;
1016
    case SAMPLE_FMT_S16:
1017
        return 16;
1018
    case SAMPLE_FMT_S32:
1019
    case SAMPLE_FMT_FLT:
1020
        return 32;
1021
    case SAMPLE_FMT_DBL:
1022
        return 64;
1023
    default:
1024
        return 0;
1025
    }
1026
}
1027

    
1028
#if !HAVE_THREADS
1029
int avcodec_thread_init(AVCodecContext *s, int thread_count){
1030
    s->thread_count = thread_count;
1031
    return -1;
1032
}
1033
#endif
1034

    
1035
unsigned int av_xiphlacing(unsigned char *s, unsigned int v)
1036
{
1037
    unsigned int n = 0;
1038

    
1039
    while(v >= 0xff) {
1040
        *s++ = 0xff;
1041
        v -= 0xff;
1042
        n++;
1043
    }
1044
    *s = v;
1045
    n++;
1046
    return n;
1047
}
1048

    
1049
/* Wrapper to work around the lack of mkstemp() on mingw/cygin.
1050
 * Also, tries to create file in /tmp first, if possible.
1051
 * *prefix can be a character constant; *filename will be allocated internally.
1052
 * Returns file descriptor of opened file (or -1 on error)
1053
 * and opened file name in **filename. */
1054
int av_tempfile(char *prefix, char **filename) {
1055
    int fd=-1;
1056
#if !HAVE_MKSTEMP
1057
    *filename = tempnam(".", prefix);
1058
#else
1059
    size_t len = strlen(prefix) + 12; /* room for "/tmp/" and "XXXXXX\0" */
1060
    *filename = av_malloc(len);
1061
#endif
1062
    /* -----common section-----*/
1063
    if (*filename == NULL) {
1064
        av_log(NULL, AV_LOG_ERROR, "ff_tempfile: Cannot allocate file name\n");
1065
        return -1;
1066
    }
1067
#if !HAVE_MKSTEMP
1068
    fd = open(*filename, O_RDWR | O_BINARY | O_CREAT, 0444);
1069
#else
1070
    snprintf(*filename, len, "/tmp/%sXXXXXX", prefix);
1071
    fd = mkstemp(*filename);
1072
    if (fd < 0) {
1073
        snprintf(*filename, len, "./%sXXXXXX", prefix);
1074
        fd = mkstemp(*filename);
1075
    }
1076
#endif
1077
    /* -----common section-----*/
1078
    if (fd < 0) {
1079
        av_log(NULL, AV_LOG_ERROR, "ff_tempfile: Cannot open temporary file %s\n", *filename);
1080
        return -1;
1081
    }
1082
    return fd; /* success */
1083
}
1084

    
1085
typedef struct {
1086
    const char *abbr;
1087
    int width, height;
1088
} VideoFrameSizeAbbr;
1089

    
1090
typedef struct {
1091
    const char *abbr;
1092
    int rate_num, rate_den;
1093
} VideoFrameRateAbbr;
1094

    
1095
static const VideoFrameSizeAbbr video_frame_size_abbrs[] = {
1096
    { "ntsc",      720, 480 },
1097
    { "pal",       720, 576 },
1098
    { "qntsc",     352, 240 }, /* VCD compliant NTSC */
1099
    { "qpal",      352, 288 }, /* VCD compliant PAL */
1100
    { "sntsc",     640, 480 }, /* square pixel NTSC */
1101
    { "spal",      768, 576 }, /* square pixel PAL */
1102
    { "film",      352, 240 },
1103
    { "ntsc-film", 352, 240 },
1104
    { "sqcif",     128,  96 },
1105
    { "qcif",      176, 144 },
1106
    { "cif",       352, 288 },
1107
    { "4cif",      704, 576 },
1108
    { "16cif",    1408,1152 },
1109
    { "qqvga",     160, 120 },
1110
    { "qvga",      320, 240 },
1111
    { "vga",       640, 480 },
1112
    { "svga",      800, 600 },
1113
    { "xga",      1024, 768 },
1114
    { "uxga",     1600,1200 },
1115
    { "qxga",     2048,1536 },
1116
    { "sxga",     1280,1024 },
1117
    { "qsxga",    2560,2048 },
1118
    { "hsxga",    5120,4096 },
1119
    { "wvga",      852, 480 },
1120
    { "wxga",     1366, 768 },
1121
    { "wsxga",    1600,1024 },
1122
    { "wuxga",    1920,1200 },
1123
    { "woxga",    2560,1600 },
1124
    { "wqsxga",   3200,2048 },
1125
    { "wquxga",   3840,2400 },
1126
    { "whsxga",   6400,4096 },
1127
    { "whuxga",   7680,4800 },
1128
    { "cga",       320, 200 },
1129
    { "ega",       640, 350 },
1130
    { "hd480",     852, 480 },
1131
    { "hd720",    1280, 720 },
1132
    { "hd1080",   1920,1080 },
1133
};
1134

    
1135
static const VideoFrameRateAbbr video_frame_rate_abbrs[]= {
1136
    { "ntsc",      30000, 1001 },
1137
    { "pal",          25,    1 },
1138
    { "qntsc",     30000, 1001 }, /* VCD compliant NTSC */
1139
    { "qpal",         25,    1 }, /* VCD compliant PAL */
1140
    { "sntsc",     30000, 1001 }, /* square pixel NTSC */
1141
    { "spal",         25,    1 }, /* square pixel PAL */
1142
    { "film",         24,    1 },
1143
    { "ntsc-film", 24000, 1001 },
1144
};
1145

    
1146
int av_parse_video_frame_size(int *width_ptr, int *height_ptr, const char *str)
1147
{
1148
    int i;
1149
    int n = FF_ARRAY_ELEMS(video_frame_size_abbrs);
1150
    char *p;
1151
    int frame_width = 0, frame_height = 0;
1152

    
1153
    for(i=0;i<n;i++) {
1154
        if (!strcmp(video_frame_size_abbrs[i].abbr, str)) {
1155
            frame_width = video_frame_size_abbrs[i].width;
1156
            frame_height = video_frame_size_abbrs[i].height;
1157
            break;
1158
        }
1159
    }
1160
    if (i == n) {
1161
        p = str;
1162
        frame_width = strtol(p, &p, 10);
1163
        if (*p)
1164
            p++;
1165
        frame_height = strtol(p, &p, 10);
1166
    }
1167
    if (frame_width <= 0 || frame_height <= 0)
1168
        return -1;
1169
    *width_ptr = frame_width;
1170
    *height_ptr = frame_height;
1171
    return 0;
1172
}
1173

    
1174
int av_parse_video_frame_rate(AVRational *frame_rate, const char *arg)
1175
{
1176
    int i;
1177
    int n = FF_ARRAY_ELEMS(video_frame_rate_abbrs);
1178
    char* cp;
1179

    
1180
    /* First, we check our abbreviation table */
1181
    for (i = 0; i < n; ++i)
1182
         if (!strcmp(video_frame_rate_abbrs[i].abbr, arg)) {
1183
             frame_rate->num = video_frame_rate_abbrs[i].rate_num;
1184
             frame_rate->den = video_frame_rate_abbrs[i].rate_den;
1185
             return 0;
1186
         }
1187

    
1188
    /* Then, we try to parse it as fraction */
1189
    cp = strchr(arg, '/');
1190
    if (!cp)
1191
        cp = strchr(arg, ':');
1192
    if (cp) {
1193
        char* cpp;
1194
        frame_rate->num = strtol(arg, &cpp, 10);
1195
        if (cpp != arg || cpp == cp)
1196
            frame_rate->den = strtol(cp+1, &cpp, 10);
1197
        else
1198
           frame_rate->num = 0;
1199
    }
1200
    else {
1201
        /* Finally we give up and parse it as double */
1202
        AVRational time_base = av_d2q(strtod(arg, 0), 1001000);
1203
        frame_rate->den = time_base.den;
1204
        frame_rate->num = time_base.num;
1205
    }
1206
    if (!frame_rate->num || !frame_rate->den)
1207
        return -1;
1208
    else
1209
        return 0;
1210
}
1211

    
1212
void av_log_missing_feature(void *avc, const char *feature, int want_sample)
1213
{
1214
    av_log(avc, AV_LOG_WARNING, "%s not implemented. Update your FFmpeg "
1215
            "version to the newest one from SVN. If the problem still "
1216
            "occurs, it means that your file has a feature which has not "
1217
            "been implemented.", feature);
1218
    if(want_sample)
1219
        av_log_ask_for_sample(avc, NULL);
1220
    else
1221
        av_log(avc, AV_LOG_WARNING, "\n");
1222
}
1223

    
1224
void av_log_ask_for_sample(void *avc, const char *msg)
1225
{
1226
    if (msg)
1227
        av_log(avc, AV_LOG_WARNING, "%s ", msg);
1228
    av_log(avc, AV_LOG_WARNING, "If you want to help, upload a sample "
1229
            "of this file to ftp://upload.ffmpeg.org/MPlayer/incoming/ "
1230
            "and contact the ffmpeg-devel mailing list.\n");
1231
}
1232

    
1233
static AVHWAccel *first_hwaccel = NULL;
1234

    
1235
void av_register_hwaccel(AVHWAccel *hwaccel)
1236
{
1237
    AVHWAccel **p = &first_hwaccel;
1238
    while (*p)
1239
        p = &(*p)->next;
1240
    *p = hwaccel;
1241
    hwaccel->next = NULL;
1242
}
1243

    
1244
AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel)
1245
{
1246
    return hwaccel ? hwaccel->next : first_hwaccel;
1247
}
1248

    
1249
AVHWAccel *ff_find_hwaccel(enum CodecID codec_id, enum PixelFormat pix_fmt)
1250
{
1251
    AVHWAccel *hwaccel=NULL;
1252

    
1253
    while((hwaccel= av_hwaccel_next(hwaccel))){
1254
        if (   hwaccel->id      == codec_id
1255
            && hwaccel->pix_fmt == pix_fmt)
1256
            return hwaccel;
1257
    }
1258
    return NULL;
1259
}
1260

    
1261
int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op))
1262
{
1263
    if (ff_lockmgr_cb) {
1264
        if (ff_lockmgr_cb(&codec_mutex, AV_LOCK_DESTROY))
1265
            return -1;
1266
    }
1267

    
1268
    ff_lockmgr_cb = cb;
1269

    
1270
    if (ff_lockmgr_cb) {
1271
        if (ff_lockmgr_cb(&codec_mutex, AV_LOCK_CREATE))
1272
            return -1;
1273
    }
1274
    return 0;
1275
}