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ffmpeg / libavcodec / utils.c @ b7098cc1

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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 || s->codec_id == CODEC_ID_VP5 ||
269
                   s->codec_id == CODEC_ID_VP6 || s->codec_id == CODEC_ID_VP6F ||
270
                   s->codec_id == CODEC_ID_VP6A)
271
                    stride_align[i]= 16;
272
                else
273
#endif
274
                stride_align[i] = STRIDE_ALIGN;
275
                unaligned |= picture.linesize[i] % stride_align[i];
276
            }
277
        } while (unaligned);
278

    
279
        tmpsize = ff_fill_pointer(&picture, NULL, s->pix_fmt, h);
280
        if (tmpsize < 0)
281
            return -1;
282

    
283
        for (i=0; i<3 && picture.data[i+1]; i++)
284
            size[i] = picture.data[i+1] - picture.data[i];
285
        size[i] = tmpsize - (picture.data[i] - picture.data[0]);
286

    
287
        buf->last_pic_num= -256*256*256*64;
288
        memset(buf->base, 0, sizeof(buf->base));
289
        memset(buf->data, 0, sizeof(buf->data));
290

    
291
        for(i=0; i<4 && size[i]; i++){
292
            const int h_shift= i==0 ? 0 : h_chroma_shift;
293
            const int v_shift= i==0 ? 0 : v_chroma_shift;
294

    
295
            buf->linesize[i]= picture.linesize[i];
296

    
297
            buf->base[i]= av_malloc(size[i]+16); //FIXME 16
298
            if(buf->base[i]==NULL) return -1;
299
            memset(buf->base[i], 128, size[i]);
300

    
301
            // no edge if EDEG EMU or not planar YUV
302
            if((s->flags&CODEC_FLAG_EMU_EDGE) || !size[2])
303
                buf->data[i] = buf->base[i];
304
            else
305
                buf->data[i] = buf->base[i] + FFALIGN((buf->linesize[i]*EDGE_WIDTH>>v_shift) + (EDGE_WIDTH>>h_shift), stride_align[i]);
306
        }
307
        if(size[1] && !size[2])
308
            ff_set_systematic_pal((uint32_t*)buf->data[1], s->pix_fmt);
309
        buf->width  = s->width;
310
        buf->height = s->height;
311
        buf->pix_fmt= s->pix_fmt;
312
        pic->age= 256*256*256*64;
313
    }
314
    pic->type= FF_BUFFER_TYPE_INTERNAL;
315

    
316
    for(i=0; i<4; i++){
317
        pic->base[i]= buf->base[i];
318
        pic->data[i]= buf->data[i];
319
        pic->linesize[i]= buf->linesize[i];
320
    }
321
    s->internal_buffer_count++;
322

    
323
    pic->reordered_opaque= s->reordered_opaque;
324

    
325
    if(s->debug&FF_DEBUG_BUFFERS)
326
        av_log(s, AV_LOG_DEBUG, "default_get_buffer called on pic %p, %d buffers used\n", pic, s->internal_buffer_count);
327

    
328
    return 0;
329
}
330

    
331
void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic){
332
    int i;
333
    InternalBuffer *buf, *last;
334

    
335
    assert(pic->type==FF_BUFFER_TYPE_INTERNAL);
336
    assert(s->internal_buffer_count);
337

    
338
    buf = NULL; /* avoids warning */
339
    for(i=0; i<s->internal_buffer_count; i++){ //just 3-5 checks so is not worth to optimize
340
        buf= &((InternalBuffer*)s->internal_buffer)[i];
341
        if(buf->data[0] == pic->data[0])
342
            break;
343
    }
344
    assert(i < s->internal_buffer_count);
345
    s->internal_buffer_count--;
346
    last = &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
347

    
348
    FFSWAP(InternalBuffer, *buf, *last);
349

    
350
    for(i=0; i<4; i++){
351
        pic->data[i]=NULL;
352
//        pic->base[i]=NULL;
353
    }
354
//printf("R%X\n", pic->opaque);
355

    
356
    if(s->debug&FF_DEBUG_BUFFERS)
357
        av_log(s, AV_LOG_DEBUG, "default_release_buffer called on pic %p, %d buffers used\n", pic, s->internal_buffer_count);
358
}
359

    
360
int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic){
361
    AVFrame temp_pic;
362
    int i;
363

    
364
    /* If no picture return a new buffer */
365
    if(pic->data[0] == NULL) {
366
        /* We will copy from buffer, so must be readable */
367
        pic->buffer_hints |= FF_BUFFER_HINTS_READABLE;
368
        return s->get_buffer(s, pic);
369
    }
370

    
371
    /* If internal buffer type return the same buffer */
372
    if(pic->type == FF_BUFFER_TYPE_INTERNAL) {
373
        pic->reordered_opaque= s->reordered_opaque;
374
        return 0;
375
    }
376

    
377
    /*
378
     * Not internal type and reget_buffer not overridden, emulate cr buffer
379
     */
380
    temp_pic = *pic;
381
    for(i = 0; i < 4; i++)
382
        pic->data[i] = pic->base[i] = NULL;
383
    pic->opaque = NULL;
384
    /* Allocate new frame */
385
    if (s->get_buffer(s, pic))
386
        return -1;
387
    /* Copy image data from old buffer to new buffer */
388
    av_picture_copy((AVPicture*)pic, (AVPicture*)&temp_pic, s->pix_fmt, s->width,
389
             s->height);
390
    s->release_buffer(s, &temp_pic); // Release old frame
391
    return 0;
392
}
393

    
394
int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size){
395
    int i;
396

    
397
    for(i=0; i<count; i++){
398
        int r= func(c, (char*)arg + i*size);
399
        if(ret) ret[i]= r;
400
    }
401
    return 0;
402
}
403

    
404
int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int jobnr, int threadnr),void *arg, int *ret, int count){
405
    int i;
406

    
407
    for(i=0; i<count; i++){
408
        int r= func(c, arg, i, 0);
409
        if(ret) ret[i]= r;
410
    }
411
    return 0;
412
}
413

    
414
enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat *fmt){
415
    while (*fmt != PIX_FMT_NONE && ff_is_hwaccel_pix_fmt(*fmt))
416
        ++fmt;
417
    return fmt[0];
418
}
419

    
420
void avcodec_get_frame_defaults(AVFrame *pic){
421
    memset(pic, 0, sizeof(AVFrame));
422

    
423
    pic->pts= AV_NOPTS_VALUE;
424
    pic->key_frame= 1;
425
}
426

    
427
AVFrame *avcodec_alloc_frame(void){
428
    AVFrame *pic= av_malloc(sizeof(AVFrame));
429

    
430
    if(pic==NULL) return NULL;
431

    
432
    avcodec_get_frame_defaults(pic);
433

    
434
    return pic;
435
}
436

    
437
int attribute_align_arg avcodec_open(AVCodecContext *avctx, AVCodec *codec)
438
{
439
    int ret= -1;
440

    
441
    /* If there is a user-supplied mutex locking routine, call it. */
442
    if (ff_lockmgr_cb) {
443
        if ((*ff_lockmgr_cb)(&codec_mutex, AV_LOCK_OBTAIN))
444
            return -1;
445
    }
446

    
447
    entangled_thread_counter++;
448
    if(entangled_thread_counter != 1){
449
        av_log(avctx, AV_LOG_ERROR, "insufficient thread locking around avcodec_open/close()\n");
450
        goto end;
451
    }
452

    
453
    if(avctx->codec || !codec)
454
        goto end;
455

    
456
    if (codec->priv_data_size > 0) {
457
        avctx->priv_data = av_mallocz(codec->priv_data_size);
458
        if (!avctx->priv_data) {
459
            ret = AVERROR(ENOMEM);
460
            goto end;
461
        }
462
    } else {
463
        avctx->priv_data = NULL;
464
    }
465

    
466
    if(avctx->coded_width && avctx->coded_height)
467
        avcodec_set_dimensions(avctx, avctx->coded_width, avctx->coded_height);
468
    else if(avctx->width && avctx->height)
469
        avcodec_set_dimensions(avctx, avctx->width, avctx->height);
470

    
471
#define SANE_NB_CHANNELS 128U
472
    if (((avctx->coded_width || avctx->coded_height)
473
        && avcodec_check_dimensions(avctx, avctx->coded_width, avctx->coded_height))
474
        || avctx->channels > SANE_NB_CHANNELS) {
475
        ret = AVERROR(EINVAL);
476
        goto free_and_end;
477
    }
478

    
479
    avctx->codec = codec;
480
    if ((avctx->codec_type == CODEC_TYPE_UNKNOWN || avctx->codec_type == codec->type) &&
481
        avctx->codec_id == CODEC_ID_NONE) {
482
        avctx->codec_type = codec->type;
483
        avctx->codec_id   = codec->id;
484
    }
485
    if(avctx->codec_id != codec->id || avctx->codec_type != codec->type){
486
        av_log(avctx, AV_LOG_ERROR, "codec type or id mismatches\n");
487
        goto free_and_end;
488
    }
489
    avctx->frame_number = 0;
490
    if(avctx->codec->init){
491
        ret = avctx->codec->init(avctx);
492
        if (ret < 0) {
493
            goto free_and_end;
494
        }
495
    }
496
    ret=0;
497
end:
498
    entangled_thread_counter--;
499

    
500
    /* Release any user-supplied mutex. */
501
    if (ff_lockmgr_cb) {
502
        (*ff_lockmgr_cb)(&codec_mutex, AV_LOCK_RELEASE);
503
    }
504
    return ret;
505
free_and_end:
506
    av_freep(&avctx->priv_data);
507
    avctx->codec= NULL;
508
    goto end;
509
}
510

    
511
int attribute_align_arg avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size,
512
                         const short *samples)
513
{
514
    if(buf_size < FF_MIN_BUFFER_SIZE && 0){
515
        av_log(avctx, AV_LOG_ERROR, "buffer smaller than minimum size\n");
516
        return -1;
517
    }
518
    if((avctx->codec->capabilities & CODEC_CAP_DELAY) || samples){
519
        int ret = avctx->codec->encode(avctx, buf, buf_size, samples);
520
        avctx->frame_number++;
521
        return ret;
522
    }else
523
        return 0;
524
}
525

    
526
int attribute_align_arg avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
527
                         const AVFrame *pict)
528
{
529
    if(buf_size < FF_MIN_BUFFER_SIZE){
530
        av_log(avctx, AV_LOG_ERROR, "buffer smaller than minimum size\n");
531
        return -1;
532
    }
533
    if(avcodec_check_dimensions(avctx,avctx->width,avctx->height))
534
        return -1;
535
    if((avctx->codec->capabilities & CODEC_CAP_DELAY) || pict){
536
        int ret = avctx->codec->encode(avctx, buf, buf_size, pict);
537
        avctx->frame_number++;
538
        emms_c(); //needed to avoid an emms_c() call before every return;
539

    
540
        return ret;
541
    }else
542
        return 0;
543
}
544

    
545
int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
546
                            const AVSubtitle *sub)
547
{
548
    int ret;
549
    if(sub->start_display_time) {
550
        av_log(avctx, AV_LOG_ERROR, "start_display_time must be 0.\n");
551
        return -1;
552
    }
553
    if(sub->num_rects == 0 || !sub->rects)
554
        return -1;
555
    ret = avctx->codec->encode(avctx, buf, buf_size, sub);
556
    avctx->frame_number++;
557
    return ret;
558
}
559

    
560
#if LIBAVCODEC_VERSION_MAJOR < 53
561
int attribute_align_arg avcodec_decode_video(AVCodecContext *avctx, AVFrame *picture,
562
                         int *got_picture_ptr,
563
                         const uint8_t *buf, int buf_size)
564
{
565
    AVPacket avpkt;
566
    av_init_packet(&avpkt);
567
    avpkt.data = buf;
568
    avpkt.size = buf_size;
569
    // HACK for CorePNG to decode as normal PNG by default
570
    avpkt.flags = AV_PKT_FLAG_KEY;
571

    
572
    return avcodec_decode_video2(avctx, picture, got_picture_ptr, &avpkt);
573
}
574
#endif
575

    
576
int attribute_align_arg avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
577
                         int *got_picture_ptr,
578
                         AVPacket *avpkt)
579
{
580
    int ret;
581

    
582
    *got_picture_ptr= 0;
583
    if((avctx->coded_width||avctx->coded_height) && avcodec_check_dimensions(avctx,avctx->coded_width,avctx->coded_height))
584
        return -1;
585
    if((avctx->codec->capabilities & CODEC_CAP_DELAY) || avpkt->size){
586
        ret = avctx->codec->decode(avctx, picture, got_picture_ptr,
587
                                avpkt);
588

    
589
        emms_c(); //needed to avoid an emms_c() call before every return;
590

    
591
        if (*got_picture_ptr)
592
            avctx->frame_number++;
593
    }else
594
        ret= 0;
595

    
596
    return ret;
597
}
598

    
599
#if LIBAVCODEC_VERSION_MAJOR < 53
600
int attribute_align_arg avcodec_decode_audio2(AVCodecContext *avctx, int16_t *samples,
601
                         int *frame_size_ptr,
602
                         const uint8_t *buf, int buf_size)
603
{
604
    AVPacket avpkt;
605
    av_init_packet(&avpkt);
606
    avpkt.data = buf;
607
    avpkt.size = buf_size;
608

    
609
    return avcodec_decode_audio3(avctx, samples, frame_size_ptr, &avpkt);
610
}
611
#endif
612

    
613
int attribute_align_arg avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples,
614
                         int *frame_size_ptr,
615
                         AVPacket *avpkt)
616
{
617
    int ret;
618

    
619
    if((avctx->codec->capabilities & CODEC_CAP_DELAY) || avpkt->size){
620
        //FIXME remove the check below _after_ ensuring that all audio check that the available space is enough
621
        if(*frame_size_ptr < AVCODEC_MAX_AUDIO_FRAME_SIZE){
622
            av_log(avctx, AV_LOG_ERROR, "buffer smaller than AVCODEC_MAX_AUDIO_FRAME_SIZE\n");
623
            return -1;
624
        }
625
        if(*frame_size_ptr < FF_MIN_BUFFER_SIZE ||
626
        *frame_size_ptr < avctx->channels * avctx->frame_size * sizeof(int16_t)){
627
            av_log(avctx, AV_LOG_ERROR, "buffer %d too small\n", *frame_size_ptr);
628
            return -1;
629
        }
630

    
631
        ret = avctx->codec->decode(avctx, samples, frame_size_ptr, avpkt);
632
        avctx->frame_number++;
633
    }else{
634
        ret= 0;
635
        *frame_size_ptr=0;
636
    }
637
    return ret;
638
}
639

    
640
#if LIBAVCODEC_VERSION_MAJOR < 53
641
int avcodec_decode_subtitle(AVCodecContext *avctx, AVSubtitle *sub,
642
                            int *got_sub_ptr,
643
                            const uint8_t *buf, int buf_size)
644
{
645
    AVPacket avpkt;
646
    av_init_packet(&avpkt);
647
    avpkt.data = buf;
648
    avpkt.size = buf_size;
649

    
650
    return avcodec_decode_subtitle2(avctx, sub, got_sub_ptr, &avpkt);
651
}
652
#endif
653

    
654
int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
655
                            int *got_sub_ptr,
656
                            AVPacket *avpkt)
657
{
658
    int ret;
659

    
660
    *got_sub_ptr = 0;
661
    ret = avctx->codec->decode(avctx, sub, got_sub_ptr, avpkt);
662
    if (*got_sub_ptr)
663
        avctx->frame_number++;
664
    return ret;
665
}
666

    
667
av_cold int avcodec_close(AVCodecContext *avctx)
668
{
669
    /* If there is a user-supplied mutex locking routine, call it. */
670
    if (ff_lockmgr_cb) {
671
        if ((*ff_lockmgr_cb)(&codec_mutex, AV_LOCK_OBTAIN))
672
            return -1;
673
    }
674

    
675
    entangled_thread_counter++;
676
    if(entangled_thread_counter != 1){
677
        av_log(avctx, AV_LOG_ERROR, "insufficient thread locking around avcodec_open/close()\n");
678
        entangled_thread_counter--;
679
        return -1;
680
    }
681

    
682
    if (HAVE_THREADS && avctx->thread_opaque)
683
        avcodec_thread_free(avctx);
684
    if (avctx->codec && avctx->codec->close)
685
        avctx->codec->close(avctx);
686
    avcodec_default_free_buffers(avctx);
687
    av_freep(&avctx->priv_data);
688
    avctx->codec = NULL;
689
    entangled_thread_counter--;
690

    
691
    /* Release any user-supplied mutex. */
692
    if (ff_lockmgr_cb) {
693
        (*ff_lockmgr_cb)(&codec_mutex, AV_LOCK_RELEASE);
694
    }
695
    return 0;
696
}
697

    
698
AVCodec *avcodec_find_encoder(enum CodecID id)
699
{
700
    AVCodec *p;
701
    p = first_avcodec;
702
    while (p) {
703
        if (p->encode != NULL && p->id == id)
704
            return p;
705
        p = p->next;
706
    }
707
    return NULL;
708
}
709

    
710
AVCodec *avcodec_find_encoder_by_name(const char *name)
711
{
712
    AVCodec *p;
713
    if (!name)
714
        return NULL;
715
    p = first_avcodec;
716
    while (p) {
717
        if (p->encode != NULL && strcmp(name,p->name) == 0)
718
            return p;
719
        p = p->next;
720
    }
721
    return NULL;
722
}
723

    
724
AVCodec *avcodec_find_decoder(enum CodecID id)
725
{
726
    AVCodec *p;
727
    p = first_avcodec;
728
    while (p) {
729
        if (p->decode != NULL && p->id == id)
730
            return p;
731
        p = p->next;
732
    }
733
    return NULL;
734
}
735

    
736
AVCodec *avcodec_find_decoder_by_name(const char *name)
737
{
738
    AVCodec *p;
739
    if (!name)
740
        return NULL;
741
    p = first_avcodec;
742
    while (p) {
743
        if (p->decode != NULL && strcmp(name,p->name) == 0)
744
            return p;
745
        p = p->next;
746
    }
747
    return NULL;
748
}
749

    
750
int av_get_bit_rate(AVCodecContext *ctx)
751
{
752
    int bit_rate;
753
    int bits_per_sample;
754

    
755
    switch(ctx->codec_type) {
756
    case CODEC_TYPE_VIDEO:
757
        bit_rate = ctx->bit_rate;
758
        break;
759
    case CODEC_TYPE_AUDIO:
760
        bits_per_sample = av_get_bits_per_sample(ctx->codec_id);
761
        bit_rate = bits_per_sample ? ctx->sample_rate * ctx->channels * bits_per_sample : ctx->bit_rate;
762
        break;
763
    case CODEC_TYPE_DATA:
764
        bit_rate = ctx->bit_rate;
765
        break;
766
    case CODEC_TYPE_SUBTITLE:
767
        bit_rate = ctx->bit_rate;
768
        break;
769
    case CODEC_TYPE_ATTACHMENT:
770
        bit_rate = ctx->bit_rate;
771
        break;
772
    default:
773
        bit_rate = 0;
774
        break;
775
    }
776
    return bit_rate;
777
}
778

    
779
void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)
780
{
781
    const char *codec_name;
782
    AVCodec *p;
783
    char buf1[32];
784
    int bitrate;
785
    AVRational display_aspect_ratio;
786

    
787
    if (encode)
788
        p = avcodec_find_encoder(enc->codec_id);
789
    else
790
        p = avcodec_find_decoder(enc->codec_id);
791

    
792
    if (p) {
793
        codec_name = p->name;
794
    } else if (enc->codec_id == CODEC_ID_MPEG2TS) {
795
        /* fake mpeg2 transport stream codec (currently not
796
           registered) */
797
        codec_name = "mpeg2ts";
798
    } else if (enc->codec_name[0] != '\0') {
799
        codec_name = enc->codec_name;
800
    } else {
801
        /* output avi tags */
802
        if(   isprint(enc->codec_tag&0xFF) && isprint((enc->codec_tag>>8)&0xFF)
803
           && isprint((enc->codec_tag>>16)&0xFF) && isprint((enc->codec_tag>>24)&0xFF)){
804
            snprintf(buf1, sizeof(buf1), "%c%c%c%c / 0x%04X",
805
                     enc->codec_tag & 0xff,
806
                     (enc->codec_tag >> 8) & 0xff,
807
                     (enc->codec_tag >> 16) & 0xff,
808
                     (enc->codec_tag >> 24) & 0xff,
809
                      enc->codec_tag);
810
        } else {
811
            snprintf(buf1, sizeof(buf1), "0x%04x", enc->codec_tag);
812
        }
813
        codec_name = buf1;
814
    }
815

    
816
    switch(enc->codec_type) {
817
    case CODEC_TYPE_VIDEO:
818
        snprintf(buf, buf_size,
819
                 "Video: %s%s",
820
                 codec_name, enc->mb_decision ? " (hq)" : "");
821
        if (enc->pix_fmt != PIX_FMT_NONE) {
822
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
823
                     ", %s",
824
                     avcodec_get_pix_fmt_name(enc->pix_fmt));
825
        }
826
        if (enc->width) {
827
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
828
                     ", %dx%d",
829
                     enc->width, enc->height);
830
            if (enc->sample_aspect_ratio.num) {
831
                av_reduce(&display_aspect_ratio.num, &display_aspect_ratio.den,
832
                          enc->width*enc->sample_aspect_ratio.num,
833
                          enc->height*enc->sample_aspect_ratio.den,
834
                          1024*1024);
835
                snprintf(buf + strlen(buf), buf_size - strlen(buf),
836
                         " [PAR %d:%d DAR %d:%d]",
837
                         enc->sample_aspect_ratio.num, enc->sample_aspect_ratio.den,
838
                         display_aspect_ratio.num, display_aspect_ratio.den);
839
            }
840
            if(av_log_get_level() >= AV_LOG_DEBUG){
841
                int g= av_gcd(enc->time_base.num, enc->time_base.den);
842
                snprintf(buf + strlen(buf), buf_size - strlen(buf),
843
                     ", %d/%d",
844
                     enc->time_base.num/g, enc->time_base.den/g);
845
            }
846
        }
847
        if (encode) {
848
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
849
                     ", q=%d-%d", enc->qmin, enc->qmax);
850
        }
851
        break;
852
    case CODEC_TYPE_AUDIO:
853
        snprintf(buf, buf_size,
854
                 "Audio: %s",
855
                 codec_name);
856
        if (enc->sample_rate) {
857
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
858
                     ", %d Hz", enc->sample_rate);
859
        }
860
        av_strlcat(buf, ", ", buf_size);
861
        avcodec_get_channel_layout_string(buf + strlen(buf), buf_size - strlen(buf), enc->channels, enc->channel_layout);
862
        if (enc->sample_fmt != SAMPLE_FMT_NONE) {
863
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
864
                     ", %s", avcodec_get_sample_fmt_name(enc->sample_fmt));
865
        }
866
        break;
867
    case CODEC_TYPE_DATA:
868
        snprintf(buf, buf_size, "Data: %s", codec_name);
869
        break;
870
    case CODEC_TYPE_SUBTITLE:
871
        snprintf(buf, buf_size, "Subtitle: %s", codec_name);
872
        break;
873
    case CODEC_TYPE_ATTACHMENT:
874
        snprintf(buf, buf_size, "Attachment: %s", codec_name);
875
        break;
876
    default:
877
        snprintf(buf, buf_size, "Invalid Codec type %d", enc->codec_type);
878
        return;
879
    }
880
    if (encode) {
881
        if (enc->flags & CODEC_FLAG_PASS1)
882
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
883
                     ", pass 1");
884
        if (enc->flags & CODEC_FLAG_PASS2)
885
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
886
                     ", pass 2");
887
    }
888
    bitrate = av_get_bit_rate(enc);
889
    if (bitrate != 0) {
890
        snprintf(buf + strlen(buf), buf_size - strlen(buf),
891
                 ", %d kb/s", bitrate / 1000);
892
    }
893
}
894

    
895
unsigned avcodec_version( void )
896
{
897
  return LIBAVCODEC_VERSION_INT;
898
}
899

    
900
const char *avcodec_configuration(void)
901
{
902
    return FFMPEG_CONFIGURATION;
903
}
904

    
905
const char *avcodec_license(void)
906
{
907
#define LICENSE_PREFIX "libavcodec license: "
908
    return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;
909
}
910

    
911
void avcodec_init(void)
912
{
913
    static int initialized = 0;
914

    
915
    if (initialized != 0)
916
        return;
917
    initialized = 1;
918

    
919
    dsputil_static_init();
920
}
921

    
922
void avcodec_flush_buffers(AVCodecContext *avctx)
923
{
924
    if(avctx->codec->flush)
925
        avctx->codec->flush(avctx);
926
}
927

    
928
void avcodec_default_free_buffers(AVCodecContext *s){
929
    int i, j;
930

    
931
    if(s->internal_buffer==NULL) return;
932

    
933
    if (s->internal_buffer_count)
934
        av_log(s, AV_LOG_WARNING, "Found %i unreleased buffers!\n", s->internal_buffer_count);
935
    for(i=0; i<INTERNAL_BUFFER_SIZE; i++){
936
        InternalBuffer *buf= &((InternalBuffer*)s->internal_buffer)[i];
937
        for(j=0; j<4; j++){
938
            av_freep(&buf->base[j]);
939
            buf->data[j]= NULL;
940
        }
941
    }
942
    av_freep(&s->internal_buffer);
943

    
944
    s->internal_buffer_count=0;
945
}
946

    
947
char av_get_pict_type_char(int pict_type){
948
    switch(pict_type){
949
    case FF_I_TYPE: return 'I';
950
    case FF_P_TYPE: return 'P';
951
    case FF_B_TYPE: return 'B';
952
    case FF_S_TYPE: return 'S';
953
    case FF_SI_TYPE:return 'i';
954
    case FF_SP_TYPE:return 'p';
955
    case FF_BI_TYPE:return 'b';
956
    default:        return '?';
957
    }
958
}
959

    
960
int av_get_bits_per_sample(enum CodecID codec_id){
961
    switch(codec_id){
962
    case CODEC_ID_ADPCM_SBPRO_2:
963
        return 2;
964
    case CODEC_ID_ADPCM_SBPRO_3:
965
        return 3;
966
    case CODEC_ID_ADPCM_SBPRO_4:
967
    case CODEC_ID_ADPCM_CT:
968
    case CODEC_ID_ADPCM_IMA_WAV:
969
    case CODEC_ID_ADPCM_MS:
970
    case CODEC_ID_ADPCM_YAMAHA:
971
        return 4;
972
    case CODEC_ID_PCM_ALAW:
973
    case CODEC_ID_PCM_MULAW:
974
    case CODEC_ID_PCM_S8:
975
    case CODEC_ID_PCM_U8:
976
    case CODEC_ID_PCM_ZORK:
977
        return 8;
978
    case CODEC_ID_PCM_S16BE:
979
    case CODEC_ID_PCM_S16LE:
980
    case CODEC_ID_PCM_S16LE_PLANAR:
981
    case CODEC_ID_PCM_U16BE:
982
    case CODEC_ID_PCM_U16LE:
983
        return 16;
984
    case CODEC_ID_PCM_S24DAUD:
985
    case CODEC_ID_PCM_S24BE:
986
    case CODEC_ID_PCM_S24LE:
987
    case CODEC_ID_PCM_U24BE:
988
    case CODEC_ID_PCM_U24LE:
989
        return 24;
990
    case CODEC_ID_PCM_S32BE:
991
    case CODEC_ID_PCM_S32LE:
992
    case CODEC_ID_PCM_U32BE:
993
    case CODEC_ID_PCM_U32LE:
994
    case CODEC_ID_PCM_F32BE:
995
    case CODEC_ID_PCM_F32LE:
996
        return 32;
997
    case CODEC_ID_PCM_F64BE:
998
    case CODEC_ID_PCM_F64LE:
999
        return 64;
1000
    default:
1001
        return 0;
1002
    }
1003
}
1004

    
1005
int av_get_bits_per_sample_format(enum SampleFormat sample_fmt) {
1006
    switch (sample_fmt) {
1007
    case SAMPLE_FMT_U8:
1008
        return 8;
1009
    case SAMPLE_FMT_S16:
1010
        return 16;
1011
    case SAMPLE_FMT_S32:
1012
    case SAMPLE_FMT_FLT:
1013
        return 32;
1014
    case SAMPLE_FMT_DBL:
1015
        return 64;
1016
    default:
1017
        return 0;
1018
    }
1019
}
1020

    
1021
#if !HAVE_THREADS
1022
int avcodec_thread_init(AVCodecContext *s, int thread_count){
1023
    s->thread_count = thread_count;
1024
    return -1;
1025
}
1026
#endif
1027

    
1028
unsigned int av_xiphlacing(unsigned char *s, unsigned int v)
1029
{
1030
    unsigned int n = 0;
1031

    
1032
    while(v >= 0xff) {
1033
        *s++ = 0xff;
1034
        v -= 0xff;
1035
        n++;
1036
    }
1037
    *s = v;
1038
    n++;
1039
    return n;
1040
}
1041

    
1042
/* Wrapper to work around the lack of mkstemp() on mingw/cygin.
1043
 * Also, tries to create file in /tmp first, if possible.
1044
 * *prefix can be a character constant; *filename will be allocated internally.
1045
 * Returns file descriptor of opened file (or -1 on error)
1046
 * and opened file name in **filename. */
1047
int av_tempfile(char *prefix, char **filename) {
1048
    int fd=-1;
1049
#if !HAVE_MKSTEMP
1050
    *filename = tempnam(".", prefix);
1051
#else
1052
    size_t len = strlen(prefix) + 12; /* room for "/tmp/" and "XXXXXX\0" */
1053
    *filename = av_malloc(len);
1054
#endif
1055
    /* -----common section-----*/
1056
    if (*filename == NULL) {
1057
        av_log(NULL, AV_LOG_ERROR, "ff_tempfile: Cannot allocate file name\n");
1058
        return -1;
1059
    }
1060
#if !HAVE_MKSTEMP
1061
    fd = open(*filename, O_RDWR | O_BINARY | O_CREAT, 0444);
1062
#else
1063
    snprintf(*filename, len, "/tmp/%sXXXXXX", prefix);
1064
    fd = mkstemp(*filename);
1065
    if (fd < 0) {
1066
        snprintf(*filename, len, "./%sXXXXXX", prefix);
1067
        fd = mkstemp(*filename);
1068
    }
1069
#endif
1070
    /* -----common section-----*/
1071
    if (fd < 0) {
1072
        av_log(NULL, AV_LOG_ERROR, "ff_tempfile: Cannot open temporary file %s\n", *filename);
1073
        return -1;
1074
    }
1075
    return fd; /* success */
1076
}
1077

    
1078
typedef struct {
1079
    const char *abbr;
1080
    int width, height;
1081
} VideoFrameSizeAbbr;
1082

    
1083
typedef struct {
1084
    const char *abbr;
1085
    int rate_num, rate_den;
1086
} VideoFrameRateAbbr;
1087

    
1088
static const VideoFrameSizeAbbr video_frame_size_abbrs[] = {
1089
    { "ntsc",      720, 480 },
1090
    { "pal",       720, 576 },
1091
    { "qntsc",     352, 240 }, /* VCD compliant NTSC */
1092
    { "qpal",      352, 288 }, /* VCD compliant PAL */
1093
    { "sntsc",     640, 480 }, /* square pixel NTSC */
1094
    { "spal",      768, 576 }, /* square pixel PAL */
1095
    { "film",      352, 240 },
1096
    { "ntsc-film", 352, 240 },
1097
    { "sqcif",     128,  96 },
1098
    { "qcif",      176, 144 },
1099
    { "cif",       352, 288 },
1100
    { "4cif",      704, 576 },
1101
    { "16cif",    1408,1152 },
1102
    { "qqvga",     160, 120 },
1103
    { "qvga",      320, 240 },
1104
    { "vga",       640, 480 },
1105
    { "svga",      800, 600 },
1106
    { "xga",      1024, 768 },
1107
    { "uxga",     1600,1200 },
1108
    { "qxga",     2048,1536 },
1109
    { "sxga",     1280,1024 },
1110
    { "qsxga",    2560,2048 },
1111
    { "hsxga",    5120,4096 },
1112
    { "wvga",      852, 480 },
1113
    { "wxga",     1366, 768 },
1114
    { "wsxga",    1600,1024 },
1115
    { "wuxga",    1920,1200 },
1116
    { "woxga",    2560,1600 },
1117
    { "wqsxga",   3200,2048 },
1118
    { "wquxga",   3840,2400 },
1119
    { "whsxga",   6400,4096 },
1120
    { "whuxga",   7680,4800 },
1121
    { "cga",       320, 200 },
1122
    { "ega",       640, 350 },
1123
    { "hd480",     852, 480 },
1124
    { "hd720",    1280, 720 },
1125
    { "hd1080",   1920,1080 },
1126
};
1127

    
1128
static const VideoFrameRateAbbr video_frame_rate_abbrs[]= {
1129
    { "ntsc",      30000, 1001 },
1130
    { "pal",          25,    1 },
1131
    { "qntsc",     30000, 1001 }, /* VCD compliant NTSC */
1132
    { "qpal",         25,    1 }, /* VCD compliant PAL */
1133
    { "sntsc",     30000, 1001 }, /* square pixel NTSC */
1134
    { "spal",         25,    1 }, /* square pixel PAL */
1135
    { "film",         24,    1 },
1136
    { "ntsc-film", 24000, 1001 },
1137
};
1138

    
1139
int av_parse_video_frame_size(int *width_ptr, int *height_ptr, const char *str)
1140
{
1141
    int i;
1142
    int n = FF_ARRAY_ELEMS(video_frame_size_abbrs);
1143
    char *p;
1144
    int frame_width = 0, frame_height = 0;
1145

    
1146
    for(i=0;i<n;i++) {
1147
        if (!strcmp(video_frame_size_abbrs[i].abbr, str)) {
1148
            frame_width = video_frame_size_abbrs[i].width;
1149
            frame_height = video_frame_size_abbrs[i].height;
1150
            break;
1151
        }
1152
    }
1153
    if (i == n) {
1154
        p = str;
1155
        frame_width = strtol(p, &p, 10);
1156
        if (*p)
1157
            p++;
1158
        frame_height = strtol(p, &p, 10);
1159
    }
1160
    if (frame_width <= 0 || frame_height <= 0)
1161
        return -1;
1162
    *width_ptr = frame_width;
1163
    *height_ptr = frame_height;
1164
    return 0;
1165
}
1166

    
1167
int av_parse_video_frame_rate(AVRational *frame_rate, const char *arg)
1168
{
1169
    int i;
1170
    int n = FF_ARRAY_ELEMS(video_frame_rate_abbrs);
1171
    char* cp;
1172

    
1173
    /* First, we check our abbreviation table */
1174
    for (i = 0; i < n; ++i)
1175
         if (!strcmp(video_frame_rate_abbrs[i].abbr, arg)) {
1176
             frame_rate->num = video_frame_rate_abbrs[i].rate_num;
1177
             frame_rate->den = video_frame_rate_abbrs[i].rate_den;
1178
             return 0;
1179
         }
1180

    
1181
    /* Then, we try to parse it as fraction */
1182
    cp = strchr(arg, '/');
1183
    if (!cp)
1184
        cp = strchr(arg, ':');
1185
    if (cp) {
1186
        char* cpp;
1187
        frame_rate->num = strtol(arg, &cpp, 10);
1188
        if (cpp != arg || cpp == cp)
1189
            frame_rate->den = strtol(cp+1, &cpp, 10);
1190
        else
1191
           frame_rate->num = 0;
1192
    }
1193
    else {
1194
        /* Finally we give up and parse it as double */
1195
        AVRational time_base = av_d2q(strtod(arg, 0), 1001000);
1196
        frame_rate->den = time_base.den;
1197
        frame_rate->num = time_base.num;
1198
    }
1199
    if (!frame_rate->num || !frame_rate->den)
1200
        return -1;
1201
    else
1202
        return 0;
1203
}
1204

    
1205
int ff_match_2uint16(const uint16_t (*tab)[2], int size, int a, int b){
1206
    int i;
1207
    for(i=0; i<size && !(tab[i][0]==a && tab[i][1]==b); i++);
1208
    return i;
1209
}
1210

    
1211
void av_log_missing_feature(void *avc, const char *feature, int want_sample)
1212
{
1213
    av_log(avc, AV_LOG_WARNING, "%s not implemented. Update your FFmpeg "
1214
            "version to the newest one from SVN. If the problem still "
1215
            "occurs, it means that your file has a feature which has not "
1216
            "been implemented.", feature);
1217
    if(want_sample)
1218
        av_log_ask_for_sample(avc, NULL);
1219
    else
1220
        av_log(avc, AV_LOG_WARNING, "\n");
1221
}
1222

    
1223
void av_log_ask_for_sample(void *avc, const char *msg)
1224
{
1225
    if (msg)
1226
        av_log(avc, AV_LOG_WARNING, "%s ", msg);
1227
    av_log(avc, AV_LOG_WARNING, "If you want to help, upload a sample "
1228
            "of this file to ftp://upload.ffmpeg.org/MPlayer/incoming/ "
1229
            "and contact the ffmpeg-devel mailing list.\n");
1230
}
1231

    
1232
static AVHWAccel *first_hwaccel = NULL;
1233

    
1234
void av_register_hwaccel(AVHWAccel *hwaccel)
1235
{
1236
    AVHWAccel **p = &first_hwaccel;
1237
    while (*p)
1238
        p = &(*p)->next;
1239
    *p = hwaccel;
1240
    hwaccel->next = NULL;
1241
}
1242

    
1243
AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel)
1244
{
1245
    return hwaccel ? hwaccel->next : first_hwaccel;
1246
}
1247

    
1248
AVHWAccel *ff_find_hwaccel(enum CodecID codec_id, enum PixelFormat pix_fmt)
1249
{
1250
    AVHWAccel *hwaccel=NULL;
1251

    
1252
    while((hwaccel= av_hwaccel_next(hwaccel))){
1253
        if (   hwaccel->id      == codec_id
1254
            && hwaccel->pix_fmt == pix_fmt)
1255
            return hwaccel;
1256
    }
1257
    return NULL;
1258
}
1259

    
1260
int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op))
1261
{
1262
    if (ff_lockmgr_cb) {
1263
        if (ff_lockmgr_cb(&codec_mutex, AV_LOCK_DESTROY))
1264
            return -1;
1265
    }
1266

    
1267
    ff_lockmgr_cb = cb;
1268

    
1269
    if (ff_lockmgr_cb) {
1270
        if (ff_lockmgr_cb(&codec_mutex, AV_LOCK_CREATE))
1271
            return -1;
1272
    }
1273
    return 0;
1274
}