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ffmpeg / libavcodec / utils.c @ 0fb49b59

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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
 *
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 * 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 "libavutil/pixdesc.h"
35
#include "avcodec.h"
36
#include "dsputil.h"
37
#include "opt.h"
38
#include "imgconvert.h"
39
#include "audioconvert.h"
40
#include "libxvid_internal.h"
41
#include "internal.h"
42
#include <stdlib.h>
43
#include <stdarg.h>
44
#include <limits.h>
45
#include <float.h>
46
#if !HAVE_MKSTEMP
47
#include <fcntl.h>
48
#endif
49

    
50
static int volatile entangled_thread_counter=0;
51
int (*ff_lockmgr_cb)(void **mutex, enum AVLockOp op);
52
static void *codec_mutex;
53

    
54
void *av_fast_realloc(void *ptr, unsigned int *size, unsigned int min_size)
55
{
56
    if(min_size < *size)
57
        return ptr;
58

    
59
    *size= FFMAX(17*min_size/16 + 32, min_size);
60

    
61
    ptr= av_realloc(ptr, *size);
62
    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
63
        *size= 0;
64

    
65
    return ptr;
66
}
67

    
68
void av_fast_malloc(void *ptr, unsigned int *size, unsigned int min_size)
69
{
70
    void **p = ptr;
71
    if (min_size < *size)
72
        return;
73
    *size= FFMAX(17*min_size/16 + 32, min_size);
74
    av_free(*p);
75
    *p = av_malloc(*size);
76
    if (!*p) *size = 0;
77
}
78

    
79
/* encoder management */
80
static AVCodec *first_avcodec = NULL;
81

    
82
AVCodec *av_codec_next(AVCodec *c){
83
    if(c) return c->next;
84
    else  return first_avcodec;
85
}
86

    
87
void avcodec_register(AVCodec *codec)
88
{
89
    AVCodec **p;
90
    avcodec_init();
91
    p = &first_avcodec;
92
    while (*p != NULL) p = &(*p)->next;
93
    *p = codec;
94
    codec->next = NULL;
95
}
96

    
97
#if LIBAVCODEC_VERSION_MAJOR < 53
98
void register_avcodec(AVCodec *codec)
99
{
100
    avcodec_register(codec);
101
}
102
#endif
103

    
104
unsigned avcodec_get_edge_width(void)
105
{
106
    return EDGE_WIDTH;
107
}
108

    
109
void avcodec_set_dimensions(AVCodecContext *s, int width, int height){
110
    s->coded_width = width;
111
    s->coded_height= height;
112
    s->width = -((-width )>>s->lowres);
113
    s->height= -((-height)>>s->lowres);
114
}
115

    
116
typedef struct InternalBuffer{
117
    int last_pic_num;
118
    uint8_t *base[4];
119
    uint8_t *data[4];
120
    int linesize[4];
121
    int width, height;
122
    enum PixelFormat pix_fmt;
123
}InternalBuffer;
124

    
125
#define INTERNAL_BUFFER_SIZE 32
126

    
127
void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height, int linesize_align[4]){
128
    int w_align= 1;
129
    int h_align= 1;
130

    
131
    switch(s->pix_fmt){
132
    case PIX_FMT_YUV420P:
133
    case PIX_FMT_YUYV422:
134
    case PIX_FMT_UYVY422:
135
    case PIX_FMT_YUV422P:
136
    case PIX_FMT_YUV440P:
137
    case PIX_FMT_YUV444P:
138
    case PIX_FMT_GRAY8:
139
    case PIX_FMT_GRAY16BE:
140
    case PIX_FMT_GRAY16LE:
141
    case PIX_FMT_YUVJ420P:
142
    case PIX_FMT_YUVJ422P:
143
    case PIX_FMT_YUVJ440P:
144
    case PIX_FMT_YUVJ444P:
145
    case PIX_FMT_YUVA420P:
146
        w_align= 16; //FIXME check for non mpeg style codecs and use less alignment
147
        h_align= 16;
148
        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)
149
            h_align= 32; // interlaced is rounded up to 2 MBs
150
        break;
151
    case PIX_FMT_YUV411P:
152
    case PIX_FMT_UYYVYY411:
153
        w_align=32;
154
        h_align=8;
155
        break;
156
    case PIX_FMT_YUV410P:
157
        if(s->codec_id == CODEC_ID_SVQ1){
158
            w_align=64;
159
            h_align=64;
160
        }
161
    case PIX_FMT_RGB555:
162
        if(s->codec_id == CODEC_ID_RPZA){
163
            w_align=4;
164
            h_align=4;
165
        }
166
    case PIX_FMT_PAL8:
167
    case PIX_FMT_BGR8:
168
    case PIX_FMT_RGB8:
169
        if(s->codec_id == CODEC_ID_SMC){
170
            w_align=4;
171
            h_align=4;
172
        }
173
        break;
174
    case PIX_FMT_BGR24:
175
        if((s->codec_id == CODEC_ID_MSZH) || (s->codec_id == CODEC_ID_ZLIB)){
176
            w_align=4;
177
            h_align=4;
178
        }
179
        break;
180
    default:
181
        w_align= 1;
182
        h_align= 1;
183
        break;
184
    }
185

    
186
    *width = FFALIGN(*width , w_align);
187
    *height= FFALIGN(*height, h_align);
188
    if(s->codec_id == CODEC_ID_H264)
189
        *height+=2; // some of the optimized chroma MC reads one line too much
190

    
191
    linesize_align[0] =
192
    linesize_align[1] =
193
    linesize_align[2] =
194
    linesize_align[3] = STRIDE_ALIGN;
195
//STRIDE_ALIGN is 8 for SSE* but this does not work for SVQ1 chroma planes
196
//we could change STRIDE_ALIGN to 16 for x86/sse but it would increase the
197
//picture size unneccessarily in some cases. The solution here is not
198
//pretty and better ideas are welcome!
199
#if HAVE_MMX
200
    if(s->codec_id == CODEC_ID_SVQ1 || s->codec_id == CODEC_ID_VP5 ||
201
       s->codec_id == CODEC_ID_VP6 || s->codec_id == CODEC_ID_VP6F ||
202
       s->codec_id == CODEC_ID_VP6A) {
203
        linesize_align[0] =
204
        linesize_align[1] =
205
        linesize_align[2] = 16;
206
    }
207
#endif
208
}
209

    
210
void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height){
211
    int chroma_shift = av_pix_fmt_descriptors[s->pix_fmt].log2_chroma_w;
212
    int linesize_align[4];
213
    int align;
214
    avcodec_align_dimensions2(s, width, height, linesize_align);
215
    align = FFMAX(linesize_align[0], linesize_align[3]);
216
    linesize_align[1] <<= chroma_shift;
217
    linesize_align[2] <<= chroma_shift;
218
    align = FFMAX3(align, linesize_align[1], linesize_align[2]);
219
    *width=FFALIGN(*width, align);
220
}
221

    
222
int avcodec_check_dimensions(void *av_log_ctx, unsigned int w, unsigned int h){
223
    if((int)w>0 && (int)h>0 && (w+128)*(uint64_t)(h+128) < INT_MAX/8)
224
        return 0;
225

    
226
    av_log(av_log_ctx, AV_LOG_ERROR, "picture size invalid (%ux%u)\n", w, h);
227
    return -1;
228
}
229

    
230
int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic){
231
    int i;
232
    int w= s->width;
233
    int h= s->height;
234
    InternalBuffer *buf;
235
    int *picture_number;
236

    
237
    if(pic->data[0]!=NULL) {
238
        av_log(s, AV_LOG_ERROR, "pic->data[0]!=NULL in avcodec_default_get_buffer\n");
239
        return -1;
240
    }
241
    if(s->internal_buffer_count >= INTERNAL_BUFFER_SIZE) {
242
        av_log(s, AV_LOG_ERROR, "internal_buffer_count overflow (missing release_buffer?)\n");
243
        return -1;
244
    }
245

    
246
    if(avcodec_check_dimensions(s,w,h))
247
        return -1;
248

    
249
    if(s->internal_buffer==NULL){
250
        s->internal_buffer= av_mallocz((INTERNAL_BUFFER_SIZE+1)*sizeof(InternalBuffer));
251
    }
252
#if 0
253
    s->internal_buffer= av_fast_realloc(
254
        s->internal_buffer,
255
        &s->internal_buffer_size,
256
        sizeof(InternalBuffer)*FFMAX(99,  s->internal_buffer_count+1)/*FIXME*/
257
        );
258
#endif
259

    
260
    buf= &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
261
    picture_number= &(((InternalBuffer*)s->internal_buffer)[INTERNAL_BUFFER_SIZE]).last_pic_num; //FIXME ugly hack
262
    (*picture_number)++;
263

    
264
    if(buf->base[0] && (buf->width != w || buf->height != h || buf->pix_fmt != s->pix_fmt)){
265
        for(i=0; i<4; i++){
266
            av_freep(&buf->base[i]);
267
            buf->data[i]= NULL;
268
        }
269
    }
270

    
271
    if(buf->base[0]){
272
        pic->age= *picture_number - buf->last_pic_num;
273
        buf->last_pic_num= *picture_number;
274
    }else{
275
        int h_chroma_shift, v_chroma_shift;
276
        int size[4] = {0};
277
        int tmpsize;
278
        int unaligned;
279
        AVPicture picture;
280
        int stride_align[4];
281

    
282
        avcodec_get_chroma_sub_sample(s->pix_fmt, &h_chroma_shift, &v_chroma_shift);
283

    
284
        avcodec_align_dimensions2(s, &w, &h, stride_align);
285

    
286
        if(!(s->flags&CODEC_FLAG_EMU_EDGE)){
287
            w+= EDGE_WIDTH*2;
288
            h+= EDGE_WIDTH*2;
289
        }
290

    
291
        do {
292
            // NOTE: do not align linesizes individually, this breaks e.g. assumptions
293
            // that linesize[0] == 2*linesize[1] in the MPEG-encoder for 4:2:2
294
            ff_fill_linesize(&picture, s->pix_fmt, w);
295
            // increase alignment of w for next try (rhs gives the lowest bit set in w)
296
            w += w & ~(w-1);
297

    
298
            unaligned = 0;
299
            for (i=0; i<4; i++){
300
                unaligned |= picture.linesize[i] % stride_align[i];
301
            }
302
        } while (unaligned);
303

    
304
        tmpsize = ff_fill_pointer(&picture, NULL, s->pix_fmt, h);
305
        if (tmpsize < 0)
306
            return -1;
307

    
308
        for (i=0; i<3 && picture.data[i+1]; i++)
309
            size[i] = picture.data[i+1] - picture.data[i];
310
        size[i] = tmpsize - (picture.data[i] - picture.data[0]);
311

    
312
        buf->last_pic_num= -256*256*256*64;
313
        memset(buf->base, 0, sizeof(buf->base));
314
        memset(buf->data, 0, sizeof(buf->data));
315

    
316
        for(i=0; i<4 && size[i]; i++){
317
            const int h_shift= i==0 ? 0 : h_chroma_shift;
318
            const int v_shift= i==0 ? 0 : v_chroma_shift;
319

    
320
            buf->linesize[i]= picture.linesize[i];
321

    
322
            buf->base[i]= av_malloc(size[i]+16); //FIXME 16
323
            if(buf->base[i]==NULL) return -1;
324
            memset(buf->base[i], 128, size[i]);
325

    
326
            // no edge if EDEG EMU or not planar YUV
327
            if((s->flags&CODEC_FLAG_EMU_EDGE) || !size[2])
328
                buf->data[i] = buf->base[i];
329
            else
330
                buf->data[i] = buf->base[i] + FFALIGN((buf->linesize[i]*EDGE_WIDTH>>v_shift) + (EDGE_WIDTH>>h_shift), stride_align[i]);
331
        }
332
        if(size[1] && !size[2])
333
            ff_set_systematic_pal((uint32_t*)buf->data[1], s->pix_fmt);
334
        buf->width  = s->width;
335
        buf->height = s->height;
336
        buf->pix_fmt= s->pix_fmt;
337
        pic->age= 256*256*256*64;
338
    }
339
    pic->type= FF_BUFFER_TYPE_INTERNAL;
340

    
341
    for(i=0; i<4; i++){
342
        pic->base[i]= buf->base[i];
343
        pic->data[i]= buf->data[i];
344
        pic->linesize[i]= buf->linesize[i];
345
    }
346
    s->internal_buffer_count++;
347

    
348
    pic->reordered_opaque= s->reordered_opaque;
349

    
350
    if(s->debug&FF_DEBUG_BUFFERS)
351
        av_log(s, AV_LOG_DEBUG, "default_get_buffer called on pic %p, %d buffers used\n", pic, s->internal_buffer_count);
352

    
353
    return 0;
354
}
355

    
356
void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic){
357
    int i;
358
    InternalBuffer *buf, *last;
359

    
360
    assert(pic->type==FF_BUFFER_TYPE_INTERNAL);
361
    assert(s->internal_buffer_count);
362

    
363
    buf = NULL; /* avoids warning */
364
    for(i=0; i<s->internal_buffer_count; i++){ //just 3-5 checks so is not worth to optimize
365
        buf= &((InternalBuffer*)s->internal_buffer)[i];
366
        if(buf->data[0] == pic->data[0])
367
            break;
368
    }
369
    assert(i < s->internal_buffer_count);
370
    s->internal_buffer_count--;
371
    last = &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
372

    
373
    FFSWAP(InternalBuffer, *buf, *last);
374

    
375
    for(i=0; i<4; i++){
376
        pic->data[i]=NULL;
377
//        pic->base[i]=NULL;
378
    }
379
//printf("R%X\n", pic->opaque);
380

    
381
    if(s->debug&FF_DEBUG_BUFFERS)
382
        av_log(s, AV_LOG_DEBUG, "default_release_buffer called on pic %p, %d buffers used\n", pic, s->internal_buffer_count);
383
}
384

    
385
int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic){
386
    AVFrame temp_pic;
387
    int i;
388

    
389
    /* If no picture return a new buffer */
390
    if(pic->data[0] == NULL) {
391
        /* We will copy from buffer, so must be readable */
392
        pic->buffer_hints |= FF_BUFFER_HINTS_READABLE;
393
        return s->get_buffer(s, pic);
394
    }
395

    
396
    /* If internal buffer type return the same buffer */
397
    if(pic->type == FF_BUFFER_TYPE_INTERNAL) {
398
        pic->reordered_opaque= s->reordered_opaque;
399
        return 0;
400
    }
401

    
402
    /*
403
     * Not internal type and reget_buffer not overridden, emulate cr buffer
404
     */
405
    temp_pic = *pic;
406
    for(i = 0; i < 4; i++)
407
        pic->data[i] = pic->base[i] = NULL;
408
    pic->opaque = NULL;
409
    /* Allocate new frame */
410
    if (s->get_buffer(s, pic))
411
        return -1;
412
    /* Copy image data from old buffer to new buffer */
413
    av_picture_copy((AVPicture*)pic, (AVPicture*)&temp_pic, s->pix_fmt, s->width,
414
             s->height);
415
    s->release_buffer(s, &temp_pic); // Release old frame
416
    return 0;
417
}
418

    
419
int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size){
420
    int i;
421

    
422
    for(i=0; i<count; i++){
423
        int r= func(c, (char*)arg + i*size);
424
        if(ret) ret[i]= r;
425
    }
426
    return 0;
427
}
428

    
429
int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int jobnr, int threadnr),void *arg, int *ret, int count){
430
    int i;
431

    
432
    for(i=0; i<count; i++){
433
        int r= func(c, arg, i, 0);
434
        if(ret) ret[i]= r;
435
    }
436
    return 0;
437
}
438

    
439
enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat *fmt){
440
    while (*fmt != PIX_FMT_NONE && ff_is_hwaccel_pix_fmt(*fmt))
441
        ++fmt;
442
    return fmt[0];
443
}
444

    
445
void avcodec_get_frame_defaults(AVFrame *pic){
446
    memset(pic, 0, sizeof(AVFrame));
447

    
448
    pic->pts= AV_NOPTS_VALUE;
449
    pic->key_frame= 1;
450
}
451

    
452
AVFrame *avcodec_alloc_frame(void){
453
    AVFrame *pic= av_malloc(sizeof(AVFrame));
454

    
455
    if(pic==NULL) return NULL;
456

    
457
    avcodec_get_frame_defaults(pic);
458

    
459
    return pic;
460
}
461

    
462
int attribute_align_arg avcodec_open(AVCodecContext *avctx, AVCodec *codec)
463
{
464
    int ret= -1;
465

    
466
    /* If there is a user-supplied mutex locking routine, call it. */
467
    if (ff_lockmgr_cb) {
468
        if ((*ff_lockmgr_cb)(&codec_mutex, AV_LOCK_OBTAIN))
469
            return -1;
470
    }
471

    
472
    entangled_thread_counter++;
473
    if(entangled_thread_counter != 1){
474
        av_log(avctx, AV_LOG_ERROR, "insufficient thread locking around avcodec_open/close()\n");
475
        goto end;
476
    }
477

    
478
    if(avctx->codec || !codec)
479
        goto end;
480

    
481
    if (codec->priv_data_size > 0) {
482
        avctx->priv_data = av_mallocz(codec->priv_data_size);
483
        if (!avctx->priv_data) {
484
            ret = AVERROR(ENOMEM);
485
            goto end;
486
        }
487
    } else {
488
        avctx->priv_data = NULL;
489
    }
490

    
491
    if(avctx->coded_width && avctx->coded_height)
492
        avcodec_set_dimensions(avctx, avctx->coded_width, avctx->coded_height);
493
    else if(avctx->width && avctx->height)
494
        avcodec_set_dimensions(avctx, avctx->width, avctx->height);
495

    
496
#define SANE_NB_CHANNELS 128U
497
    if (((avctx->coded_width || avctx->coded_height)
498
        && avcodec_check_dimensions(avctx, avctx->coded_width, avctx->coded_height))
499
        || avctx->channels > SANE_NB_CHANNELS) {
500
        ret = AVERROR(EINVAL);
501
        goto free_and_end;
502
    }
503

    
504
    avctx->codec = codec;
505
    if ((avctx->codec_type == AVMEDIA_TYPE_UNKNOWN || avctx->codec_type == codec->type) &&
506
        avctx->codec_id == CODEC_ID_NONE) {
507
        avctx->codec_type = codec->type;
508
        avctx->codec_id   = codec->id;
509
    }
510
    if(avctx->codec_id != codec->id || avctx->codec_type != codec->type){
511
        av_log(avctx, AV_LOG_ERROR, "codec type or id mismatches\n");
512
        goto free_and_end;
513
    }
514
    avctx->frame_number = 0;
515
    if(avctx->codec->init){
516
        ret = avctx->codec->init(avctx);
517
        if (ret < 0) {
518
            goto free_and_end;
519
        }
520
    }
521
    ret=0;
522
end:
523
    entangled_thread_counter--;
524

    
525
    /* Release any user-supplied mutex. */
526
    if (ff_lockmgr_cb) {
527
        (*ff_lockmgr_cb)(&codec_mutex, AV_LOCK_RELEASE);
528
    }
529
    return ret;
530
free_and_end:
531
    av_freep(&avctx->priv_data);
532
    avctx->codec= NULL;
533
    goto end;
534
}
535

    
536
int attribute_align_arg avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size,
537
                         const short *samples)
538
{
539
    if(buf_size < FF_MIN_BUFFER_SIZE && 0){
540
        av_log(avctx, AV_LOG_ERROR, "buffer smaller than minimum size\n");
541
        return -1;
542
    }
543
    if((avctx->codec->capabilities & CODEC_CAP_DELAY) || samples){
544
        int ret = avctx->codec->encode(avctx, buf, buf_size, samples);
545
        avctx->frame_number++;
546
        return ret;
547
    }else
548
        return 0;
549
}
550

    
551
int attribute_align_arg avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
552
                         const AVFrame *pict)
553
{
554
    if(buf_size < FF_MIN_BUFFER_SIZE){
555
        av_log(avctx, AV_LOG_ERROR, "buffer smaller than minimum size\n");
556
        return -1;
557
    }
558
    if(avcodec_check_dimensions(avctx,avctx->width,avctx->height))
559
        return -1;
560
    if((avctx->codec->capabilities & CODEC_CAP_DELAY) || pict){
561
        int ret = avctx->codec->encode(avctx, buf, buf_size, pict);
562
        avctx->frame_number++;
563
        emms_c(); //needed to avoid an emms_c() call before every return;
564

    
565
        return ret;
566
    }else
567
        return 0;
568
}
569

    
570
int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
571
                            const AVSubtitle *sub)
572
{
573
    int ret;
574
    if(sub->start_display_time) {
575
        av_log(avctx, AV_LOG_ERROR, "start_display_time must be 0.\n");
576
        return -1;
577
    }
578
    if(sub->num_rects == 0 || !sub->rects)
579
        return -1;
580
    ret = avctx->codec->encode(avctx, buf, buf_size, sub);
581
    avctx->frame_number++;
582
    return ret;
583
}
584

    
585
#if LIBAVCODEC_VERSION_MAJOR < 53
586
int attribute_align_arg avcodec_decode_video(AVCodecContext *avctx, AVFrame *picture,
587
                         int *got_picture_ptr,
588
                         const uint8_t *buf, int buf_size)
589
{
590
    AVPacket avpkt;
591
    av_init_packet(&avpkt);
592
    avpkt.data = buf;
593
    avpkt.size = buf_size;
594
    // HACK for CorePNG to decode as normal PNG by default
595
    avpkt.flags = AV_PKT_FLAG_KEY;
596

    
597
    return avcodec_decode_video2(avctx, picture, got_picture_ptr, &avpkt);
598
}
599
#endif
600

    
601
int attribute_align_arg avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
602
                         int *got_picture_ptr,
603
                         AVPacket *avpkt)
604
{
605
    int ret;
606

    
607
    *got_picture_ptr= 0;
608
    if((avctx->coded_width||avctx->coded_height) && avcodec_check_dimensions(avctx,avctx->coded_width,avctx->coded_height))
609
        return -1;
610
    if((avctx->codec->capabilities & CODEC_CAP_DELAY) || avpkt->size){
611
        ret = avctx->codec->decode(avctx, picture, got_picture_ptr,
612
                                avpkt);
613

    
614
        emms_c(); //needed to avoid an emms_c() call before every return;
615

    
616
        if (*got_picture_ptr)
617
            avctx->frame_number++;
618
    }else
619
        ret= 0;
620

    
621
    return ret;
622
}
623

    
624
#if LIBAVCODEC_VERSION_MAJOR < 53
625
int attribute_align_arg avcodec_decode_audio2(AVCodecContext *avctx, int16_t *samples,
626
                         int *frame_size_ptr,
627
                         const uint8_t *buf, int buf_size)
628
{
629
    AVPacket avpkt;
630
    av_init_packet(&avpkt);
631
    avpkt.data = buf;
632
    avpkt.size = buf_size;
633

    
634
    return avcodec_decode_audio3(avctx, samples, frame_size_ptr, &avpkt);
635
}
636
#endif
637

    
638
int attribute_align_arg avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples,
639
                         int *frame_size_ptr,
640
                         AVPacket *avpkt)
641
{
642
    int ret;
643

    
644
    if((avctx->codec->capabilities & CODEC_CAP_DELAY) || avpkt->size){
645
        //FIXME remove the check below _after_ ensuring that all audio check that the available space is enough
646
        if(*frame_size_ptr < AVCODEC_MAX_AUDIO_FRAME_SIZE){
647
            av_log(avctx, AV_LOG_ERROR, "buffer smaller than AVCODEC_MAX_AUDIO_FRAME_SIZE\n");
648
            return -1;
649
        }
650
        if(*frame_size_ptr < FF_MIN_BUFFER_SIZE ||
651
        *frame_size_ptr < avctx->channels * avctx->frame_size * sizeof(int16_t)){
652
            av_log(avctx, AV_LOG_ERROR, "buffer %d too small\n", *frame_size_ptr);
653
            return -1;
654
        }
655

    
656
        ret = avctx->codec->decode(avctx, samples, frame_size_ptr, avpkt);
657
        avctx->frame_number++;
658
    }else{
659
        ret= 0;
660
        *frame_size_ptr=0;
661
    }
662
    return ret;
663
}
664

    
665
#if LIBAVCODEC_VERSION_MAJOR < 53
666
int avcodec_decode_subtitle(AVCodecContext *avctx, AVSubtitle *sub,
667
                            int *got_sub_ptr,
668
                            const uint8_t *buf, int buf_size)
669
{
670
    AVPacket avpkt;
671
    av_init_packet(&avpkt);
672
    avpkt.data = buf;
673
    avpkt.size = buf_size;
674

    
675
    return avcodec_decode_subtitle2(avctx, sub, got_sub_ptr, &avpkt);
676
}
677
#endif
678

    
679
int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
680
                            int *got_sub_ptr,
681
                            AVPacket *avpkt)
682
{
683
    int ret;
684

    
685
    *got_sub_ptr = 0;
686
    ret = avctx->codec->decode(avctx, sub, got_sub_ptr, avpkt);
687
    if (*got_sub_ptr)
688
        avctx->frame_number++;
689
    return ret;
690
}
691

    
692
av_cold int avcodec_close(AVCodecContext *avctx)
693
{
694
    /* If there is a user-supplied mutex locking routine, call it. */
695
    if (ff_lockmgr_cb) {
696
        if ((*ff_lockmgr_cb)(&codec_mutex, AV_LOCK_OBTAIN))
697
            return -1;
698
    }
699

    
700
    entangled_thread_counter++;
701
    if(entangled_thread_counter != 1){
702
        av_log(avctx, AV_LOG_ERROR, "insufficient thread locking around avcodec_open/close()\n");
703
        entangled_thread_counter--;
704
        return -1;
705
    }
706

    
707
    if (HAVE_THREADS && avctx->thread_opaque)
708
        avcodec_thread_free(avctx);
709
    if (avctx->codec && avctx->codec->close)
710
        avctx->codec->close(avctx);
711
    avcodec_default_free_buffers(avctx);
712
    av_freep(&avctx->priv_data);
713
    if(avctx->codec->encode)
714
        av_freep(&avctx->extradata);
715
    avctx->codec = NULL;
716
    entangled_thread_counter--;
717

    
718
    /* Release any user-supplied mutex. */
719
    if (ff_lockmgr_cb) {
720
        (*ff_lockmgr_cb)(&codec_mutex, AV_LOCK_RELEASE);
721
    }
722
    return 0;
723
}
724

    
725
AVCodec *avcodec_find_encoder(enum CodecID id)
726
{
727
    AVCodec *p;
728
    p = first_avcodec;
729
    while (p) {
730
        if (p->encode != NULL && p->id == id)
731
            return p;
732
        p = p->next;
733
    }
734
    return NULL;
735
}
736

    
737
AVCodec *avcodec_find_encoder_by_name(const char *name)
738
{
739
    AVCodec *p;
740
    if (!name)
741
        return NULL;
742
    p = first_avcodec;
743
    while (p) {
744
        if (p->encode != NULL && strcmp(name,p->name) == 0)
745
            return p;
746
        p = p->next;
747
    }
748
    return NULL;
749
}
750

    
751
AVCodec *avcodec_find_decoder(enum CodecID id)
752
{
753
    AVCodec *p;
754
    p = first_avcodec;
755
    while (p) {
756
        if (p->decode != NULL && p->id == id)
757
            return p;
758
        p = p->next;
759
    }
760
    return NULL;
761
}
762

    
763
AVCodec *avcodec_find_decoder_by_name(const char *name)
764
{
765
    AVCodec *p;
766
    if (!name)
767
        return NULL;
768
    p = first_avcodec;
769
    while (p) {
770
        if (p->decode != NULL && strcmp(name,p->name) == 0)
771
            return p;
772
        p = p->next;
773
    }
774
    return NULL;
775
}
776

    
777
static int get_bit_rate(AVCodecContext *ctx)
778
{
779
    int bit_rate;
780
    int bits_per_sample;
781

    
782
    switch(ctx->codec_type) {
783
    case AVMEDIA_TYPE_VIDEO:
784
        bit_rate = ctx->bit_rate;
785
        break;
786
    case AVMEDIA_TYPE_AUDIO:
787
        bits_per_sample = av_get_bits_per_sample(ctx->codec_id);
788
        bit_rate = bits_per_sample ? ctx->sample_rate * ctx->channels * bits_per_sample : ctx->bit_rate;
789
        break;
790
    case AVMEDIA_TYPE_DATA:
791
        bit_rate = ctx->bit_rate;
792
        break;
793
    case AVMEDIA_TYPE_SUBTITLE:
794
        bit_rate = ctx->bit_rate;
795
        break;
796
    case AVMEDIA_TYPE_ATTACHMENT:
797
        bit_rate = ctx->bit_rate;
798
        break;
799
    default:
800
        bit_rate = 0;
801
        break;
802
    }
803
    return bit_rate;
804
}
805

    
806
void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)
807
{
808
    const char *codec_name;
809
    AVCodec *p;
810
    char buf1[32];
811
    int bitrate;
812
    AVRational display_aspect_ratio;
813

    
814
    if (encode)
815
        p = avcodec_find_encoder(enc->codec_id);
816
    else
817
        p = avcodec_find_decoder(enc->codec_id);
818

    
819
    if (p) {
820
        codec_name = p->name;
821
    } else if (enc->codec_id == CODEC_ID_MPEG2TS) {
822
        /* fake mpeg2 transport stream codec (currently not
823
           registered) */
824
        codec_name = "mpeg2ts";
825
    } else if (enc->codec_name[0] != '\0') {
826
        codec_name = enc->codec_name;
827
    } else {
828
        /* output avi tags */
829
        if(   isprint(enc->codec_tag&0xFF) && isprint((enc->codec_tag>>8)&0xFF)
830
           && isprint((enc->codec_tag>>16)&0xFF) && isprint((enc->codec_tag>>24)&0xFF)){
831
            snprintf(buf1, sizeof(buf1), "%c%c%c%c / 0x%04X",
832
                     enc->codec_tag & 0xff,
833
                     (enc->codec_tag >> 8) & 0xff,
834
                     (enc->codec_tag >> 16) & 0xff,
835
                     (enc->codec_tag >> 24) & 0xff,
836
                      enc->codec_tag);
837
        } else {
838
            snprintf(buf1, sizeof(buf1), "0x%04x", enc->codec_tag);
839
        }
840
        codec_name = buf1;
841
    }
842

    
843
    switch(enc->codec_type) {
844
    case AVMEDIA_TYPE_VIDEO:
845
        snprintf(buf, buf_size,
846
                 "Video: %s%s",
847
                 codec_name, enc->mb_decision ? " (hq)" : "");
848
        if (enc->pix_fmt != PIX_FMT_NONE) {
849
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
850
                     ", %s",
851
                     avcodec_get_pix_fmt_name(enc->pix_fmt));
852
        }
853
        if (enc->width) {
854
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
855
                     ", %dx%d",
856
                     enc->width, enc->height);
857
            if (enc->sample_aspect_ratio.num) {
858
                av_reduce(&display_aspect_ratio.num, &display_aspect_ratio.den,
859
                          enc->width*enc->sample_aspect_ratio.num,
860
                          enc->height*enc->sample_aspect_ratio.den,
861
                          1024*1024);
862
                snprintf(buf + strlen(buf), buf_size - strlen(buf),
863
                         " [PAR %d:%d DAR %d:%d]",
864
                         enc->sample_aspect_ratio.num, enc->sample_aspect_ratio.den,
865
                         display_aspect_ratio.num, display_aspect_ratio.den);
866
            }
867
            if(av_log_get_level() >= AV_LOG_DEBUG){
868
                int g= av_gcd(enc->time_base.num, enc->time_base.den);
869
                snprintf(buf + strlen(buf), buf_size - strlen(buf),
870
                     ", %d/%d",
871
                     enc->time_base.num/g, enc->time_base.den/g);
872
            }
873
        }
874
        if (encode) {
875
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
876
                     ", q=%d-%d", enc->qmin, enc->qmax);
877
        }
878
        break;
879
    case AVMEDIA_TYPE_AUDIO:
880
        snprintf(buf, buf_size,
881
                 "Audio: %s",
882
                 codec_name);
883
        if (enc->sample_rate) {
884
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
885
                     ", %d Hz", enc->sample_rate);
886
        }
887
        av_strlcat(buf, ", ", buf_size);
888
        avcodec_get_channel_layout_string(buf + strlen(buf), buf_size - strlen(buf), enc->channels, enc->channel_layout);
889
        if (enc->sample_fmt != SAMPLE_FMT_NONE) {
890
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
891
                     ", %s", avcodec_get_sample_fmt_name(enc->sample_fmt));
892
        }
893
        break;
894
    case AVMEDIA_TYPE_DATA:
895
        snprintf(buf, buf_size, "Data: %s", codec_name);
896
        break;
897
    case AVMEDIA_TYPE_SUBTITLE:
898
        snprintf(buf, buf_size, "Subtitle: %s", codec_name);
899
        break;
900
    case AVMEDIA_TYPE_ATTACHMENT:
901
        snprintf(buf, buf_size, "Attachment: %s", codec_name);
902
        break;
903
    default:
904
        snprintf(buf, buf_size, "Invalid Codec type %d", enc->codec_type);
905
        return;
906
    }
907
    if (encode) {
908
        if (enc->flags & CODEC_FLAG_PASS1)
909
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
910
                     ", pass 1");
911
        if (enc->flags & CODEC_FLAG_PASS2)
912
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
913
                     ", pass 2");
914
    }
915
    bitrate = get_bit_rate(enc);
916
    if (bitrate != 0) {
917
        snprintf(buf + strlen(buf), buf_size - strlen(buf),
918
                 ", %d kb/s", bitrate / 1000);
919
    }
920
}
921

    
922
unsigned avcodec_version( void )
923
{
924
  return LIBAVCODEC_VERSION_INT;
925
}
926

    
927
const char *avcodec_configuration(void)
928
{
929
    return FFMPEG_CONFIGURATION;
930
}
931

    
932
const char *avcodec_license(void)
933
{
934
#define LICENSE_PREFIX "libavcodec license: "
935
    return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;
936
}
937

    
938
void avcodec_init(void)
939
{
940
    static int initialized = 0;
941

    
942
    if (initialized != 0)
943
        return;
944
    initialized = 1;
945

    
946
    dsputil_static_init();
947
}
948

    
949
void avcodec_flush_buffers(AVCodecContext *avctx)
950
{
951
    if(avctx->codec->flush)
952
        avctx->codec->flush(avctx);
953
}
954

    
955
void avcodec_default_free_buffers(AVCodecContext *s){
956
    int i, j;
957

    
958
    if(s->internal_buffer==NULL) return;
959

    
960
    if (s->internal_buffer_count)
961
        av_log(s, AV_LOG_WARNING, "Found %i unreleased buffers!\n", s->internal_buffer_count);
962
    for(i=0; i<INTERNAL_BUFFER_SIZE; i++){
963
        InternalBuffer *buf= &((InternalBuffer*)s->internal_buffer)[i];
964
        for(j=0; j<4; j++){
965
            av_freep(&buf->base[j]);
966
            buf->data[j]= NULL;
967
        }
968
    }
969
    av_freep(&s->internal_buffer);
970

    
971
    s->internal_buffer_count=0;
972
}
973

    
974
char av_get_pict_type_char(int pict_type){
975
    switch(pict_type){
976
    case FF_I_TYPE: return 'I';
977
    case FF_P_TYPE: return 'P';
978
    case FF_B_TYPE: return 'B';
979
    case FF_S_TYPE: return 'S';
980
    case FF_SI_TYPE:return 'i';
981
    case FF_SP_TYPE:return 'p';
982
    case FF_BI_TYPE:return 'b';
983
    default:        return '?';
984
    }
985
}
986

    
987
int av_get_bits_per_sample(enum CodecID codec_id){
988
    switch(codec_id){
989
    case CODEC_ID_ADPCM_SBPRO_2:
990
        return 2;
991
    case CODEC_ID_ADPCM_SBPRO_3:
992
        return 3;
993
    case CODEC_ID_ADPCM_SBPRO_4:
994
    case CODEC_ID_ADPCM_CT:
995
    case CODEC_ID_ADPCM_IMA_WAV:
996
    case CODEC_ID_ADPCM_MS:
997
    case CODEC_ID_ADPCM_YAMAHA:
998
        return 4;
999
    case CODEC_ID_PCM_ALAW:
1000
    case CODEC_ID_PCM_MULAW:
1001
    case CODEC_ID_PCM_S8:
1002
    case CODEC_ID_PCM_U8:
1003
    case CODEC_ID_PCM_ZORK:
1004
        return 8;
1005
    case CODEC_ID_PCM_S16BE:
1006
    case CODEC_ID_PCM_S16LE:
1007
    case CODEC_ID_PCM_S16LE_PLANAR:
1008
    case CODEC_ID_PCM_U16BE:
1009
    case CODEC_ID_PCM_U16LE:
1010
        return 16;
1011
    case CODEC_ID_PCM_S24DAUD:
1012
    case CODEC_ID_PCM_S24BE:
1013
    case CODEC_ID_PCM_S24LE:
1014
    case CODEC_ID_PCM_U24BE:
1015
    case CODEC_ID_PCM_U24LE:
1016
        return 24;
1017
    case CODEC_ID_PCM_S32BE:
1018
    case CODEC_ID_PCM_S32LE:
1019
    case CODEC_ID_PCM_U32BE:
1020
    case CODEC_ID_PCM_U32LE:
1021
    case CODEC_ID_PCM_F32BE:
1022
    case CODEC_ID_PCM_F32LE:
1023
        return 32;
1024
    case CODEC_ID_PCM_F64BE:
1025
    case CODEC_ID_PCM_F64LE:
1026
        return 64;
1027
    default:
1028
        return 0;
1029
    }
1030
}
1031

    
1032
int av_get_bits_per_sample_format(enum SampleFormat sample_fmt) {
1033
    switch (sample_fmt) {
1034
    case SAMPLE_FMT_U8:
1035
        return 8;
1036
    case SAMPLE_FMT_S16:
1037
        return 16;
1038
    case SAMPLE_FMT_S32:
1039
    case SAMPLE_FMT_FLT:
1040
        return 32;
1041
    case SAMPLE_FMT_DBL:
1042
        return 64;
1043
    default:
1044
        return 0;
1045
    }
1046
}
1047

    
1048
#if !HAVE_THREADS
1049
int avcodec_thread_init(AVCodecContext *s, int thread_count){
1050
    s->thread_count = thread_count;
1051
    return -1;
1052
}
1053
#endif
1054

    
1055
unsigned int av_xiphlacing(unsigned char *s, unsigned int v)
1056
{
1057
    unsigned int n = 0;
1058

    
1059
    while(v >= 0xff) {
1060
        *s++ = 0xff;
1061
        v -= 0xff;
1062
        n++;
1063
    }
1064
    *s = v;
1065
    n++;
1066
    return n;
1067
}
1068

    
1069
/* Wrapper to work around the lack of mkstemp() on mingw/cygin.
1070
 * Also, tries to create file in /tmp first, if possible.
1071
 * *prefix can be a character constant; *filename will be allocated internally.
1072
 * Returns file descriptor of opened file (or -1 on error)
1073
 * and opened file name in **filename. */
1074
int av_tempfile(char *prefix, char **filename) {
1075
    int fd=-1;
1076
#if !HAVE_MKSTEMP
1077
    *filename = tempnam(".", prefix);
1078
#else
1079
    size_t len = strlen(prefix) + 12; /* room for "/tmp/" and "XXXXXX\0" */
1080
    *filename = av_malloc(len);
1081
#endif
1082
    /* -----common section-----*/
1083
    if (*filename == NULL) {
1084
        av_log(NULL, AV_LOG_ERROR, "ff_tempfile: Cannot allocate file name\n");
1085
        return -1;
1086
    }
1087
#if !HAVE_MKSTEMP
1088
    fd = open(*filename, O_RDWR | O_BINARY | O_CREAT, 0444);
1089
#else
1090
    snprintf(*filename, len, "/tmp/%sXXXXXX", prefix);
1091
    fd = mkstemp(*filename);
1092
    if (fd < 0) {
1093
        snprintf(*filename, len, "./%sXXXXXX", prefix);
1094
        fd = mkstemp(*filename);
1095
    }
1096
#endif
1097
    /* -----common section-----*/
1098
    if (fd < 0) {
1099
        av_log(NULL, AV_LOG_ERROR, "ff_tempfile: Cannot open temporary file %s\n", *filename);
1100
        return -1;
1101
    }
1102
    return fd; /* success */
1103
}
1104

    
1105
typedef struct {
1106
    const char *abbr;
1107
    int width, height;
1108
} VideoFrameSizeAbbr;
1109

    
1110
typedef struct {
1111
    const char *abbr;
1112
    int rate_num, rate_den;
1113
} VideoFrameRateAbbr;
1114

    
1115
static const VideoFrameSizeAbbr video_frame_size_abbrs[] = {
1116
    { "ntsc",      720, 480 },
1117
    { "pal",       720, 576 },
1118
    { "qntsc",     352, 240 }, /* VCD compliant NTSC */
1119
    { "qpal",      352, 288 }, /* VCD compliant PAL */
1120
    { "sntsc",     640, 480 }, /* square pixel NTSC */
1121
    { "spal",      768, 576 }, /* square pixel PAL */
1122
    { "film",      352, 240 },
1123
    { "ntsc-film", 352, 240 },
1124
    { "sqcif",     128,  96 },
1125
    { "qcif",      176, 144 },
1126
    { "cif",       352, 288 },
1127
    { "4cif",      704, 576 },
1128
    { "16cif",    1408,1152 },
1129
    { "qqvga",     160, 120 },
1130
    { "qvga",      320, 240 },
1131
    { "vga",       640, 480 },
1132
    { "svga",      800, 600 },
1133
    { "xga",      1024, 768 },
1134
    { "uxga",     1600,1200 },
1135
    { "qxga",     2048,1536 },
1136
    { "sxga",     1280,1024 },
1137
    { "qsxga",    2560,2048 },
1138
    { "hsxga",    5120,4096 },
1139
    { "wvga",      852, 480 },
1140
    { "wxga",     1366, 768 },
1141
    { "wsxga",    1600,1024 },
1142
    { "wuxga",    1920,1200 },
1143
    { "woxga",    2560,1600 },
1144
    { "wqsxga",   3200,2048 },
1145
    { "wquxga",   3840,2400 },
1146
    { "whsxga",   6400,4096 },
1147
    { "whuxga",   7680,4800 },
1148
    { "cga",       320, 200 },
1149
    { "ega",       640, 350 },
1150
    { "hd480",     852, 480 },
1151
    { "hd720",    1280, 720 },
1152
    { "hd1080",   1920,1080 },
1153
};
1154

    
1155
static const VideoFrameRateAbbr video_frame_rate_abbrs[]= {
1156
    { "ntsc",      30000, 1001 },
1157
    { "pal",          25,    1 },
1158
    { "qntsc",     30000, 1001 }, /* VCD compliant NTSC */
1159
    { "qpal",         25,    1 }, /* VCD compliant PAL */
1160
    { "sntsc",     30000, 1001 }, /* square pixel NTSC */
1161
    { "spal",         25,    1 }, /* square pixel PAL */
1162
    { "film",         24,    1 },
1163
    { "ntsc-film", 24000, 1001 },
1164
};
1165

    
1166
int av_parse_video_frame_size(int *width_ptr, int *height_ptr, const char *str)
1167
{
1168
    int i;
1169
    int n = FF_ARRAY_ELEMS(video_frame_size_abbrs);
1170
    char *p;
1171
    int frame_width = 0, frame_height = 0;
1172

    
1173
    for(i=0;i<n;i++) {
1174
        if (!strcmp(video_frame_size_abbrs[i].abbr, str)) {
1175
            frame_width = video_frame_size_abbrs[i].width;
1176
            frame_height = video_frame_size_abbrs[i].height;
1177
            break;
1178
        }
1179
    }
1180
    if (i == n) {
1181
        p = str;
1182
        frame_width = strtol(p, &p, 10);
1183
        if (*p)
1184
            p++;
1185
        frame_height = strtol(p, &p, 10);
1186
    }
1187
    if (frame_width <= 0 || frame_height <= 0)
1188
        return -1;
1189
    *width_ptr = frame_width;
1190
    *height_ptr = frame_height;
1191
    return 0;
1192
}
1193

    
1194
int av_parse_video_frame_rate(AVRational *frame_rate, const char *arg)
1195
{
1196
    int i;
1197
    int n = FF_ARRAY_ELEMS(video_frame_rate_abbrs);
1198
    char* cp;
1199

    
1200
    /* First, we check our abbreviation table */
1201
    for (i = 0; i < n; ++i)
1202
         if (!strcmp(video_frame_rate_abbrs[i].abbr, arg)) {
1203
             frame_rate->num = video_frame_rate_abbrs[i].rate_num;
1204
             frame_rate->den = video_frame_rate_abbrs[i].rate_den;
1205
             return 0;
1206
         }
1207

    
1208
    /* Then, we try to parse it as fraction */
1209
    cp = strchr(arg, '/');
1210
    if (!cp)
1211
        cp = strchr(arg, ':');
1212
    if (cp) {
1213
        char* cpp;
1214
        frame_rate->num = strtol(arg, &cpp, 10);
1215
        if (cpp != arg || cpp == cp)
1216
            frame_rate->den = strtol(cp+1, &cpp, 10);
1217
        else
1218
           frame_rate->num = 0;
1219
    }
1220
    else {
1221
        /* Finally we give up and parse it as double */
1222
        AVRational time_base = av_d2q(strtod(arg, 0), 1001000);
1223
        frame_rate->den = time_base.den;
1224
        frame_rate->num = time_base.num;
1225
    }
1226
    if (!frame_rate->num || !frame_rate->den)
1227
        return -1;
1228
    else
1229
        return 0;
1230
}
1231

    
1232
int ff_match_2uint16(const uint16_t (*tab)[2], int size, int a, int b){
1233
    int i;
1234
    for(i=0; i<size && !(tab[i][0]==a && tab[i][1]==b); i++);
1235
    return i;
1236
}
1237

    
1238
void av_log_missing_feature(void *avc, const char *feature, int want_sample)
1239
{
1240
    av_log(avc, AV_LOG_WARNING, "%s not implemented. Update your FFmpeg "
1241
            "version to the newest one from SVN. If the problem still "
1242
            "occurs, it means that your file has a feature which has not "
1243
            "been implemented.", feature);
1244
    if(want_sample)
1245
        av_log_ask_for_sample(avc, NULL);
1246
    else
1247
        av_log(avc, AV_LOG_WARNING, "\n");
1248
}
1249

    
1250
void av_log_ask_for_sample(void *avc, const char *msg)
1251
{
1252
    if (msg)
1253
        av_log(avc, AV_LOG_WARNING, "%s ", msg);
1254
    av_log(avc, AV_LOG_WARNING, "If you want to help, upload a sample "
1255
            "of this file to ftp://upload.ffmpeg.org/MPlayer/incoming/ "
1256
            "and contact the ffmpeg-devel mailing list.\n");
1257
}
1258

    
1259
static AVHWAccel *first_hwaccel = NULL;
1260

    
1261
void av_register_hwaccel(AVHWAccel *hwaccel)
1262
{
1263
    AVHWAccel **p = &first_hwaccel;
1264
    while (*p)
1265
        p = &(*p)->next;
1266
    *p = hwaccel;
1267
    hwaccel->next = NULL;
1268
}
1269

    
1270
AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel)
1271
{
1272
    return hwaccel ? hwaccel->next : first_hwaccel;
1273
}
1274

    
1275
AVHWAccel *ff_find_hwaccel(enum CodecID codec_id, enum PixelFormat pix_fmt)
1276
{
1277
    AVHWAccel *hwaccel=NULL;
1278

    
1279
    while((hwaccel= av_hwaccel_next(hwaccel))){
1280
        if (   hwaccel->id      == codec_id
1281
            && hwaccel->pix_fmt == pix_fmt)
1282
            return hwaccel;
1283
    }
1284
    return NULL;
1285
}
1286

    
1287
int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op))
1288
{
1289
    if (ff_lockmgr_cb) {
1290
        if (ff_lockmgr_cb(&codec_mutex, AV_LOCK_DESTROY))
1291
            return -1;
1292
    }
1293

    
1294
    ff_lockmgr_cb = cb;
1295

    
1296
    if (ff_lockmgr_cb) {
1297
        if (ff_lockmgr_cb(&codec_mutex, AV_LOCK_CREATE))
1298
            return -1;
1299
    }
1300
    return 0;
1301
}