Statistics
| Branch: | Revision:

ffmpeg / libavcodec / utils.c @ a33c7159

History | View | Annotate | Download (15.3 KB)

1
/*
2
 * utils for libavcodec
3
 * Copyright (c) 2001 Fabrice Bellard.
4
 *
5
 * This library is free software; you can redistribute it and/or
6
 * modify it under the terms of the GNU Lesser General Public
7
 * License as published by the Free Software Foundation; either
8
 * version 2 of the License, or (at your option) any later version.
9
 *
10
 * This library is distributed in the hope that it will be useful,
11
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13
 * Lesser General Public License for more details.
14
 *
15
 * You should have received a copy of the GNU Lesser General Public
16
 * License along with this library; if not, write to the Free Software
17
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
18
 */
19
#include "avcodec.h"
20
#include "dsputil.h"
21
#include "mpegvideo.h"
22

    
23
void *av_mallocz(unsigned int size)
24
{
25
    void *ptr;
26
    
27
    if(size == 0) fprintf(stderr, "Warning, allocating 0 bytes\n");
28
    
29
    ptr = av_malloc(size);
30
    if (!ptr)
31
        return NULL;
32
    memset(ptr, 0, size);
33
    return ptr;
34
}
35

    
36
/* allocation of static arrays - do not use for normal allocation */
37
static unsigned int last_static = 0;
38
static char*** array_static = NULL;
39
static const unsigned int grow_static = 64; // ^2
40
void *__av_mallocz_static(void** location, unsigned int size)
41
{
42
    int l = (last_static + grow_static) & ~(grow_static - 1);
43
    void *ptr = av_mallocz(size);
44
    if (!ptr)
45
        return NULL;
46

    
47
    if (location)
48
    {
49
        if (l > last_static)
50
            array_static = realloc(array_static, l);
51
        array_static[last_static++] = (char**) location;
52
        *location = ptr;
53
    }
54
    return ptr;
55
}
56
/* free all static arrays and reset pointers to 0 */
57
void av_free_static()
58
{
59
    if (array_static)
60
    {
61
        unsigned i;
62
        for (i = 0; i < last_static; i++)
63
        {
64
            free(*array_static[i]);
65
            *array_static[i] = NULL;
66
        }
67
        free(array_static);
68
        array_static = 0;
69
    }
70
    last_static = 0;
71
}
72

    
73
/* cannot call it directly because of 'void **' casting is not automatic */
74
void __av_freep(void **ptr)
75
{
76
    av_free(*ptr);
77
    *ptr = NULL;
78
}
79

    
80
/* encoder management */
81
AVCodec *first_avcodec;
82

    
83
void register_avcodec(AVCodec *format)
84
{
85
    AVCodec **p;
86
    p = &first_avcodec;
87
    while (*p != NULL) p = &(*p)->next;
88
    *p = format;
89
    format->next = NULL;
90
}
91

    
92
typedef struct DefaultPicOpaque{
93
    int last_pic_num;
94
    uint8_t *data[4];
95
}DefaultPicOpaque;
96

    
97
int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic){
98
    int i;
99
    const int width = s->width;
100
    const int height= s->height;
101
    DefaultPicOpaque *opaque;
102
    
103
    assert(pic->data[0]==NULL);
104
    assert(pic->type==0 || pic->type==FF_TYPE_INTERNAL);
105

    
106
    if(pic->opaque){
107
        opaque= (DefaultPicOpaque *)pic->opaque;
108
        for(i=0; i<3; i++)
109
            pic->data[i]= opaque->data[i];
110

    
111
//    printf("get_buffer %X coded_pic_num:%d last:%d\n", pic->opaque, pic->coded_picture_number, opaque->last_pic_num);    
112
        pic->age= pic->coded_picture_number - opaque->last_pic_num;
113
        opaque->last_pic_num= pic->coded_picture_number;
114
//printf("age: %d %d %d\n", pic->age, c->picture_number, pic->coded_picture_number);
115
    }else{
116
        int align, h_chroma_shift, v_chroma_shift;
117
        int w, h, pixel_size;
118
        
119
        avcodec_get_chroma_sub_sample(s->pix_fmt, &h_chroma_shift, &v_chroma_shift);
120
        
121
        switch(s->pix_fmt){
122
        case PIX_FMT_YUV422:
123
            pixel_size=2;
124
            break;
125
        case PIX_FMT_RGB24:
126
        case PIX_FMT_BGR24:
127
            pixel_size=3;
128
            break;
129
        case PIX_FMT_RGBA32:
130
            pixel_size=4;
131
            break;
132
        default:
133
            pixel_size=1;
134
        }
135
        
136
        if(s->codec_id==CODEC_ID_SVQ1) align=63;
137
        else                           align=15;
138
    
139
        w= (width +align)&~align;
140
        h= (height+align)&~align;
141
    
142
        if(!(s->flags&CODEC_FLAG_EMU_EDGE)){
143
            w+= EDGE_WIDTH*2;
144
            h+= EDGE_WIDTH*2;
145
        }
146
        
147
        opaque= av_mallocz(sizeof(DefaultPicOpaque));
148
        if(opaque==NULL) return -1;
149

    
150
        pic->opaque= opaque;
151
        opaque->last_pic_num= -256*256*256*64;
152

    
153
        for(i=0; i<3; i++){
154
            int h_shift= i==0 ? 0 : h_chroma_shift;
155
            int v_shift= i==0 ? 0 : v_chroma_shift;
156

    
157
            pic->linesize[i]= pixel_size*w>>h_shift;
158

    
159
            pic->base[i]= av_mallocz((pic->linesize[i]*h>>v_shift)+16); //FIXME 16
160
            if(pic->base[i]==NULL) return -1;
161

    
162
            memset(pic->base[i], 128, pic->linesize[i]*h>>v_shift);
163
        
164
            if(s->flags&CODEC_FLAG_EMU_EDGE)
165
                pic->data[i] = pic->base[i] + 16; //FIXME 16
166
            else
167
                pic->data[i] = pic->base[i] + (pic->linesize[i]*EDGE_WIDTH>>v_shift) + (EDGE_WIDTH>>h_shift) + 16; //FIXME 16
168
            
169
            opaque->data[i]= pic->data[i];
170
        }
171
        pic->age= 256*256*256*64;
172
        pic->type= FF_BUFFER_TYPE_INTERNAL;
173
    }
174

    
175
    return 0;
176
}
177

    
178
void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic){
179
    int i;
180
    
181
    assert(pic->type==FF_BUFFER_TYPE_INTERNAL);
182
    
183
    for(i=0; i<3; i++)
184
        pic->data[i]=NULL;
185
//printf("R%X\n", pic->opaque);
186
}
187

    
188
enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, enum PixelFormat * fmt){
189
    return fmt[0];
190
}
191

    
192
void avcodec_get_context_defaults(AVCodecContext *s){
193
    s->bit_rate= 800*1000;
194
    s->bit_rate_tolerance= s->bit_rate*10;
195
    s->qmin= 2;
196
    s->qmax= 31;
197
    s->mb_qmin= 2;
198
    s->mb_qmax= 31;
199
    s->rc_eq= "tex^qComp";
200
    s->qcompress= 0.5;
201
    s->max_qdiff= 3;
202
    s->b_quant_factor=1.25;
203
    s->b_quant_offset=1.25;
204
    s->i_quant_factor=-0.8;
205
    s->i_quant_offset=0.0;
206
    s->error_concealment= 3;
207
    s->error_resilience= 1;
208
    s->workaround_bugs= FF_BUG_AUTODETECT;
209
    s->frame_rate = 25 * FRAME_RATE_BASE;
210
    s->gop_size= 50;
211
    s->me_method= ME_EPZS;
212
    s->get_buffer= avcodec_default_get_buffer;
213
    s->release_buffer= avcodec_default_release_buffer;
214
    s->get_format= avcodec_default_get_format;
215
    s->me_subpel_quality=8;
216
}
217

    
218
/**
219
 * allocates a AVCodecContext and set it to defaults.
220
 * this can be deallocated by simply calling free() 
221
 */
222
AVCodecContext *avcodec_alloc_context(void){
223
    AVCodecContext *avctx= av_mallocz(sizeof(AVCodecContext));
224
    
225
    if(avctx==NULL) return NULL;
226
    
227
    avcodec_get_context_defaults(avctx);
228
    
229
    return avctx;
230
}
231

    
232
/**
233
 * allocates a AVPFrame and set it to defaults.
234
 * this can be deallocated by simply calling free() 
235
 */
236
AVFrame *avcodec_alloc_frame(void){
237
    AVFrame *pic= av_mallocz(sizeof(AVFrame));
238
    
239
    return pic;
240
}
241

    
242
int avcodec_open(AVCodecContext *avctx, AVCodec *codec)
243
{
244
    int ret;
245

    
246
    avctx->codec = codec;
247
    avctx->codec_id = codec->id;
248
    avctx->frame_number = 0;
249
    if (codec->priv_data_size > 0) {
250
        avctx->priv_data = av_mallocz(codec->priv_data_size);
251
        if (!avctx->priv_data) 
252
            return -ENOMEM;
253
    } else {
254
        avctx->priv_data = NULL;
255
    }
256
    ret = avctx->codec->init(avctx);
257
    if (ret < 0) {
258
        av_freep(&avctx->priv_data);
259
        return ret;
260
    }
261
    return 0;
262
}
263

    
264
int avcodec_encode_audio(AVCodecContext *avctx, UINT8 *buf, int buf_size, 
265
                         const short *samples)
266
{
267
    int ret;
268

    
269
    ret = avctx->codec->encode(avctx, buf, buf_size, (void *)samples);
270
    avctx->frame_number++;
271
    return ret;
272
}
273

    
274
int avcodec_encode_video(AVCodecContext *avctx, UINT8 *buf, int buf_size, 
275
                         const AVFrame *pict)
276
{
277
    int ret;
278

    
279
    ret = avctx->codec->encode(avctx, buf, buf_size, (void *)pict);
280
    
281
    emms_c(); //needed to avoid a emms_c() call before every return;
282

    
283
    avctx->frame_number++;
284
    return ret;
285
}
286

    
287
/* decode a frame. return -1 if error, otherwise return the number of
288
   bytes used. If no frame could be decompressed, *got_picture_ptr is
289
   zero. Otherwise, it is non zero */
290
int avcodec_decode_video(AVCodecContext *avctx, AVFrame *picture, 
291
                         int *got_picture_ptr,
292
                         UINT8 *buf, int buf_size)
293
{
294
    int ret;
295
    
296
    ret = avctx->codec->decode(avctx, picture, got_picture_ptr, 
297
                               buf, buf_size);
298

    
299
    emms_c(); //needed to avoid a emms_c() call before every return;
300
    
301
    if (*got_picture_ptr)                           
302
        avctx->frame_number++;
303
    return ret;
304
}
305

    
306
/* decode an audio frame. return -1 if error, otherwise return the
307
   *number of bytes used. If no frame could be decompressed,
308
   *frame_size_ptr is zero. Otherwise, it is the decompressed frame
309
   *size in BYTES. */
310
int avcodec_decode_audio(AVCodecContext *avctx, INT16 *samples, 
311
                         int *frame_size_ptr,
312
                         UINT8 *buf, int buf_size)
313
{
314
    int ret;
315

    
316
    ret = avctx->codec->decode(avctx, samples, frame_size_ptr, 
317
                               buf, buf_size);
318
    avctx->frame_number++;
319
    return ret;
320
}
321

    
322
int avcodec_close(AVCodecContext *avctx)
323
{
324
    if (avctx->codec->close)
325
        avctx->codec->close(avctx);
326
    av_freep(&avctx->priv_data);
327
    avctx->codec = NULL;
328
    return 0;
329
}
330

    
331
AVCodec *avcodec_find_encoder(enum CodecID id)
332
{
333
    AVCodec *p;
334
    p = first_avcodec;
335
    while (p) {
336
        if (p->encode != NULL && p->id == id)
337
            return p;
338
        p = p->next;
339
    }
340
    return NULL;
341
}
342

    
343
AVCodec *avcodec_find_encoder_by_name(const char *name)
344
{
345
    AVCodec *p;
346
    p = first_avcodec;
347
    while (p) {
348
        if (p->encode != NULL && strcmp(name,p->name) == 0)
349
            return p;
350
        p = p->next;
351
    }
352
    return NULL;
353
}
354

    
355
AVCodec *avcodec_find_decoder(enum CodecID id)
356
{
357
    AVCodec *p;
358
    p = first_avcodec;
359
    while (p) {
360
        if (p->decode != NULL && p->id == id)
361
            return p;
362
        p = p->next;
363
    }
364
    return NULL;
365
}
366

    
367
AVCodec *avcodec_find_decoder_by_name(const char *name)
368
{
369
    AVCodec *p;
370
    p = first_avcodec;
371
    while (p) {
372
        if (p->decode != NULL && strcmp(name,p->name) == 0)
373
            return p;
374
        p = p->next;
375
    }
376
    return NULL;
377
}
378

    
379
AVCodec *avcodec_find(enum CodecID id)
380
{
381
    AVCodec *p;
382
    p = first_avcodec;
383
    while (p) {
384
        if (p->id == id)
385
            return p;
386
        p = p->next;
387
    }
388
    return NULL;
389
}
390

    
391
void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)
392
{
393
    const char *codec_name;
394
    AVCodec *p;
395
    char buf1[32];
396
    char channels_str[100];
397
    int bitrate;
398

    
399
    if (encode)
400
        p = avcodec_find_encoder(enc->codec_id);
401
    else
402
        p = avcodec_find_decoder(enc->codec_id);
403

    
404
    if (p) {
405
        codec_name = p->name;
406
    } else if (enc->codec_name[0] != '\0') {
407
        codec_name = enc->codec_name;
408
    } else {
409
        /* output avi tags */
410
        if (enc->codec_type == CODEC_TYPE_VIDEO) {
411
            snprintf(buf1, sizeof(buf1), "%c%c%c%c", 
412
                     enc->codec_tag & 0xff,
413
                     (enc->codec_tag >> 8) & 0xff,
414
                     (enc->codec_tag >> 16) & 0xff,
415
                     (enc->codec_tag >> 24) & 0xff);
416
        } else {
417
            snprintf(buf1, sizeof(buf1), "0x%04x", enc->codec_tag);
418
        }
419
        codec_name = buf1;
420
    }
421

    
422
    switch(enc->codec_type) {
423
    case CODEC_TYPE_VIDEO:
424
        snprintf(buf, buf_size,
425
                 "Video: %s%s",
426
                 codec_name, enc->flags & CODEC_FLAG_HQ ? " (hq)" : "");
427
        if (enc->codec_id == CODEC_ID_RAWVIDEO) {
428
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
429
                     ", %s",
430
                     avcodec_get_pix_fmt_name(enc->pix_fmt));
431
        }
432
        if (enc->width) {
433
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
434
                     ", %dx%d, %0.2f fps",
435
                     enc->width, enc->height, 
436
                     (float)enc->frame_rate / FRAME_RATE_BASE);
437
        }
438
        if (encode) {
439
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
440
                     ", q=%d-%d", enc->qmin, enc->qmax);
441
        }
442
        bitrate = enc->bit_rate;
443
        break;
444
    case CODEC_TYPE_AUDIO:
445
        snprintf(buf, buf_size,
446
                 "Audio: %s",
447
                 codec_name);
448
        switch (enc->channels) {
449
            case 1:
450
                strcpy(channels_str, "mono");
451
                break;
452
            case 2:
453
                strcpy(channels_str, "stereo");
454
                break;
455
            case 6:
456
                strcpy(channels_str, "5:1");
457
                break;
458
            default:
459
                sprintf(channels_str, "%d channels", enc->channels);
460
                break;
461
        }
462
        if (enc->sample_rate) {
463
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
464
                     ", %d Hz, %s",
465
                     enc->sample_rate,
466
                     channels_str);
467
        }
468
        
469
        /* for PCM codecs, compute bitrate directly */
470
        switch(enc->codec_id) {
471
        case CODEC_ID_PCM_S16LE:
472
        case CODEC_ID_PCM_S16BE:
473
        case CODEC_ID_PCM_U16LE:
474
        case CODEC_ID_PCM_U16BE:
475
            bitrate = enc->sample_rate * enc->channels * 16;
476
            break;
477
        case CODEC_ID_PCM_S8:
478
        case CODEC_ID_PCM_U8:
479
        case CODEC_ID_PCM_ALAW:
480
        case CODEC_ID_PCM_MULAW:
481
            bitrate = enc->sample_rate * enc->channels * 8;
482
            break;
483
        default:
484
            bitrate = enc->bit_rate;
485
            break;
486
        }
487
        break;
488
    default:
489
        av_abort();
490
    }
491
    if (encode) {
492
        if (enc->flags & CODEC_FLAG_PASS1)
493
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
494
                     ", pass 1");
495
        if (enc->flags & CODEC_FLAG_PASS2)
496
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
497
                     ", pass 2");
498
    }
499
    if (bitrate != 0) {
500
        snprintf(buf + strlen(buf), buf_size - strlen(buf), 
501
                 ", %d kb/s", bitrate / 1000);
502
    }
503
}
504

    
505
unsigned avcodec_version( void )
506
{
507
  return LIBAVCODEC_VERSION_INT;
508
}
509

    
510
unsigned avcodec_build( void )
511
{
512
  return LIBAVCODEC_BUILD;
513
}
514

    
515
/* must be called before any other functions */
516
void avcodec_init(void)
517
{
518
    static int inited = 0;
519

    
520
    if (inited != 0)
521
        return;
522
    inited = 1;
523

    
524
    //dsputil_init();
525
}
526

    
527
/* this can be called after seeking and before trying to decode the next keyframe */
528
void avcodec_flush_buffers(AVCodecContext *avctx)
529
{
530
    int i;
531
    MpegEncContext *s = avctx->priv_data;
532
    
533
    switch(avctx->codec_id){
534
    case CODEC_ID_MPEG1VIDEO:
535
    case CODEC_ID_H263:
536
    case CODEC_ID_RV10:
537
    case CODEC_ID_MJPEG:
538
    case CODEC_ID_MJPEGB:
539
    case CODEC_ID_MPEG4:
540
    case CODEC_ID_MSMPEG4V1:
541
    case CODEC_ID_MSMPEG4V2:
542
    case CODEC_ID_MSMPEG4V3:
543
    case CODEC_ID_WMV1:
544
    case CODEC_ID_WMV2:
545
    case CODEC_ID_H263P:
546
    case CODEC_ID_H263I:
547
    case CODEC_ID_SVQ1:
548
        for(i=0; i<MAX_PICTURE_COUNT; i++){
549
           if(s->picture[i].data[0] && (   s->picture[i].type == FF_BUFFER_TYPE_INTERNAL
550
                                        || s->picture[i].type == FF_BUFFER_TYPE_USER))
551
            avctx->release_buffer(avctx, (AVFrame*)&s->picture[i]);
552
        }
553
        s->last_picture.data[0] = s->next_picture.data[0] = NULL;
554
        break;
555
    default:
556
        //FIXME
557
        break;
558
    }
559
}
560

    
561
static int raw_encode_init(AVCodecContext *s)
562
{
563
    return 0;
564
}
565

    
566
static int raw_decode_frame(AVCodecContext *avctx,
567
                            void *data, int *data_size,
568
                            UINT8 *buf, int buf_size)
569
{
570
    return -1;
571
}
572

    
573
static int raw_encode_frame(AVCodecContext *avctx,
574
                            unsigned char *frame, int buf_size, void *data)
575
{
576
    return -1;
577
}
578

    
579
AVCodec rawvideo_codec = {
580
    "rawvideo",
581
    CODEC_TYPE_VIDEO,
582
    CODEC_ID_RAWVIDEO,
583
    0,
584
    raw_encode_init,
585
    raw_encode_frame,
586
    NULL,
587
    raw_decode_frame,
588
};