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1
/*
2
 * utils for libavcodec
3
 * Copyright (c) 2001 Fabrice Bellard.
4
 * Copyright (c) 2003 Michel Bardiaux for the av_log API
5
 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
6
 *
7
 * This library is free software; you can redistribute it and/or
8
 * modify it under the terms of the GNU Lesser General Public
9
 * License as published by the Free Software Foundation; either
10
 * version 2 of the License, or (at your option) any later version.
11
 *
12
 * This library is distributed in the hope that it will be useful,
13
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15
 * Lesser General Public License for more details.
16
 *
17
 * You should have received a copy of the GNU Lesser General Public
18
 * License along with this library; if not, write to the Free Software
19
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
20
 */
21
 
22
/**
23
 * @file utils.c
24
 * utils.
25
 */
26
 
27
#include "avcodec.h"
28
#include "dsputil.h"
29
#include "mpegvideo.h"
30
#include "integer.h"
31
#include <stdarg.h>
32
#include <limits.h>
33

    
34
const uint8_t ff_reverse[256]={
35
0x00,0x80,0x40,0xC0,0x20,0xA0,0x60,0xE0,0x10,0x90,0x50,0xD0,0x30,0xB0,0x70,0xF0,
36
0x08,0x88,0x48,0xC8,0x28,0xA8,0x68,0xE8,0x18,0x98,0x58,0xD8,0x38,0xB8,0x78,0xF8,
37
0x04,0x84,0x44,0xC4,0x24,0xA4,0x64,0xE4,0x14,0x94,0x54,0xD4,0x34,0xB4,0x74,0xF4,
38
0x0C,0x8C,0x4C,0xCC,0x2C,0xAC,0x6C,0xEC,0x1C,0x9C,0x5C,0xDC,0x3C,0xBC,0x7C,0xFC,
39
0x02,0x82,0x42,0xC2,0x22,0xA2,0x62,0xE2,0x12,0x92,0x52,0xD2,0x32,0xB2,0x72,0xF2,
40
0x0A,0x8A,0x4A,0xCA,0x2A,0xAA,0x6A,0xEA,0x1A,0x9A,0x5A,0xDA,0x3A,0xBA,0x7A,0xFA,
41
0x06,0x86,0x46,0xC6,0x26,0xA6,0x66,0xE6,0x16,0x96,0x56,0xD6,0x36,0xB6,0x76,0xF6,
42
0x0E,0x8E,0x4E,0xCE,0x2E,0xAE,0x6E,0xEE,0x1E,0x9E,0x5E,0xDE,0x3E,0xBE,0x7E,0xFE,
43
0x01,0x81,0x41,0xC1,0x21,0xA1,0x61,0xE1,0x11,0x91,0x51,0xD1,0x31,0xB1,0x71,0xF1,
44
0x09,0x89,0x49,0xC9,0x29,0xA9,0x69,0xE9,0x19,0x99,0x59,0xD9,0x39,0xB9,0x79,0xF9,
45
0x05,0x85,0x45,0xC5,0x25,0xA5,0x65,0xE5,0x15,0x95,0x55,0xD5,0x35,0xB5,0x75,0xF5,
46
0x0D,0x8D,0x4D,0xCD,0x2D,0xAD,0x6D,0xED,0x1D,0x9D,0x5D,0xDD,0x3D,0xBD,0x7D,0xFD,
47
0x03,0x83,0x43,0xC3,0x23,0xA3,0x63,0xE3,0x13,0x93,0x53,0xD3,0x33,0xB3,0x73,0xF3,
48
0x0B,0x8B,0x4B,0xCB,0x2B,0xAB,0x6B,0xEB,0x1B,0x9B,0x5B,0xDB,0x3B,0xBB,0x7B,0xFB,
49
0x07,0x87,0x47,0xC7,0x27,0xA7,0x67,0xE7,0x17,0x97,0x57,0xD7,0x37,0xB7,0x77,0xF7,
50
0x0F,0x8F,0x4F,0xCF,0x2F,0xAF,0x6F,0xEF,0x1F,0x9F,0x5F,0xDF,0x3F,0xBF,0x7F,0xFF,
51
};
52

    
53
static int volatile entangled_thread_counter=0;
54

    
55
void avcodec_default_free_buffers(AVCodecContext *s);
56

    
57
void *av_mallocz(unsigned int size)
58
{
59
    void *ptr;
60
    
61
    ptr = av_malloc(size);
62
    if (!ptr)
63
        return NULL;
64
    memset(ptr, 0, size);
65
    return ptr;
66
}
67

    
68
char *av_strdup(const char *s)
69
{
70
    char *ptr;
71
    int len;
72
    len = strlen(s) + 1;
73
    ptr = av_malloc(len);
74
    if (!ptr)
75
        return NULL;
76
    memcpy(ptr, s, len);
77
    return ptr;
78
}
79

    
80
/**
81
 * realloc which does nothing if the block is large enough
82
 */
83
void *av_fast_realloc(void *ptr, unsigned int *size, unsigned int min_size)
84
{
85
    if(min_size < *size) 
86
        return ptr;
87
    
88
    *size= FFMAX(17*min_size/16 + 32, min_size);
89

    
90
    return av_realloc(ptr, *size);
91
}
92

    
93

    
94
static unsigned int last_static = 0;
95
static unsigned int allocated_static = 0;
96
static void** array_static = NULL;
97

    
98
/**
99
 * allocation of static arrays - do not use for normal allocation.
100
 */
101
void *av_mallocz_static(unsigned int size)
102
{
103
    void *ptr = av_mallocz(size);
104

    
105
    if(ptr){ 
106
        array_static =av_fast_realloc(array_static, &allocated_static, sizeof(void*)*(last_static+1));
107
        if(!array_static)
108
            return NULL;
109
        array_static[last_static++] = ptr;
110
    }
111

    
112
    return ptr;
113
}
114

    
115
/**
116
 * same as above, but does realloc
117
 */
118

    
119
void *av_realloc_static(void *ptr, unsigned int size)
120
{
121
    int i;
122
    if(!ptr)
123
      return av_mallocz_static(size);
124
    /* Look for the old ptr */
125
    for(i = 0; i < last_static; i++) {
126
        if(array_static[i] == ptr) {
127
            array_static[i] = av_realloc(array_static[i], size);
128
            return array_static[i];
129
        }
130
    }
131
    return NULL;
132

    
133
}
134

    
135
/**
136
 * free all static arrays and reset pointers to 0.
137
 */
138
void av_free_static(void)
139
{
140
    while(last_static){
141
        av_freep(&array_static[--last_static]);
142
    }
143
    av_freep(&array_static);
144
}
145

    
146
/**
147
 * Frees memory and sets the pointer to NULL.
148
 * @param arg pointer to the pointer which should be freed
149
 */
150
void av_freep(void *arg)
151
{
152
    void **ptr= (void**)arg;
153
    av_free(*ptr);
154
    *ptr = NULL;
155
}
156

    
157
/* encoder management */
158
AVCodec *first_avcodec = NULL;
159

    
160
void register_avcodec(AVCodec *format)
161
{
162
    AVCodec **p;
163
    p = &first_avcodec;
164
    while (*p != NULL) p = &(*p)->next;
165
    *p = format;
166
    format->next = NULL;
167
}
168

    
169
void avcodec_set_dimensions(AVCodecContext *s, int width, int height){
170
    s->coded_width = width;
171
    s->coded_height= height;
172
    s->width = -((-width )>>s->lowres);
173
    s->height= -((-height)>>s->lowres);
174
}
175

    
176
typedef struct InternalBuffer{
177
    int last_pic_num;
178
    uint8_t *base[4];
179
    uint8_t *data[4];
180
    int linesize[4];
181
}InternalBuffer;
182

    
183
#define INTERNAL_BUFFER_SIZE 32
184

    
185
#define ALIGN(x, a) (((x)+(a)-1)&~((a)-1))
186

    
187
void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height){
188
    int w_align= 1;    
189
    int h_align= 1;    
190
    
191
    switch(s->pix_fmt){
192
    case PIX_FMT_YUV420P:
193
    case PIX_FMT_YUV422:
194
    case PIX_FMT_UYVY422:
195
    case PIX_FMT_YUV422P:
196
    case PIX_FMT_YUV444P:
197
    case PIX_FMT_GRAY8:
198
    case PIX_FMT_YUVJ420P:
199
    case PIX_FMT_YUVJ422P:
200
    case PIX_FMT_YUVJ444P:
201
        w_align= 16; //FIXME check for non mpeg style codecs and use less alignment
202
        h_align= 16;
203
        break;
204
    case PIX_FMT_YUV411P:
205
    case PIX_FMT_UYVY411:
206
        w_align=32;
207
        h_align=8;
208
        break;
209
    case PIX_FMT_YUV410P:
210
        if(s->codec_id == CODEC_ID_SVQ1){
211
            w_align=64;
212
            h_align=64;
213
        }
214
    case PIX_FMT_RGB555:
215
        if(s->codec_id == CODEC_ID_RPZA){
216
            w_align=4;
217
            h_align=4;
218
        }
219
    case PIX_FMT_PAL8:
220
        if(s->codec_id == CODEC_ID_SMC){
221
            w_align=4;
222
            h_align=4;
223
        }
224
        break;
225
    case PIX_FMT_BGR24:
226
        if((s->codec_id == CODEC_ID_MSZH) || (s->codec_id == CODEC_ID_ZLIB)){
227
            w_align=4;
228
            h_align=4;
229
        }
230
        break;
231
    default:
232
        w_align= 1;
233
        h_align= 1;
234
        break;
235
    }
236

    
237
    *width = ALIGN(*width , w_align);
238
    *height= ALIGN(*height, h_align);
239
}
240

    
241
int avcodec_check_dimensions(void *av_log_ctx, unsigned int w, unsigned int h){
242
    if((int)w>0 && (int)h>0 && (w+128)*(uint64_t)(h+128) < INT_MAX/4)
243
        return 0;
244
    
245
    av_log(av_log_ctx, AV_LOG_ERROR, "picture size invalid (%ux%u)\n", w, h);
246
    return -1;
247
}
248

    
249
int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic){
250
    int i;
251
    int w= s->width;
252
    int h= s->height;
253
    InternalBuffer *buf;
254
    int *picture_number;
255

    
256
    assert(pic->data[0]==NULL);
257
    assert(INTERNAL_BUFFER_SIZE > s->internal_buffer_count);
258

    
259
    if(avcodec_check_dimensions(s,w,h))
260
        return -1;
261

    
262
    if(s->internal_buffer==NULL){
263
        s->internal_buffer= av_mallocz(INTERNAL_BUFFER_SIZE*sizeof(InternalBuffer));
264
    }
265
#if 0
266
    s->internal_buffer= av_fast_realloc(
267
        s->internal_buffer, 
268
        &s->internal_buffer_size, 
269
        sizeof(InternalBuffer)*FFMAX(99,  s->internal_buffer_count+1)/*FIXME*/
270
        );
271
#endif
272
     
273
    buf= &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
274
    picture_number= &(((InternalBuffer*)s->internal_buffer)[INTERNAL_BUFFER_SIZE-1]).last_pic_num; //FIXME ugly hack
275
    (*picture_number)++;
276
    
277
    if(buf->base[0]){
278
        pic->age= *picture_number - buf->last_pic_num;
279
        buf->last_pic_num= *picture_number;
280
    }else{
281
        int h_chroma_shift, v_chroma_shift;
282
        int pixel_size;
283
        
284
        avcodec_get_chroma_sub_sample(s->pix_fmt, &h_chroma_shift, &v_chroma_shift);
285
        
286
        switch(s->pix_fmt){
287
        case PIX_FMT_RGB555:
288
        case PIX_FMT_RGB565:
289
        case PIX_FMT_YUV422:
290
        case PIX_FMT_UYVY422:
291
            pixel_size=2;
292
            break;
293
        case PIX_FMT_RGB24:
294
        case PIX_FMT_BGR24:
295
            pixel_size=3;
296
            break;
297
        case PIX_FMT_RGBA32:
298
            pixel_size=4;
299
            break;
300
        default:
301
            pixel_size=1;
302
        }
303

    
304
        avcodec_align_dimensions(s, &w, &h);
305
            
306
        if(!(s->flags&CODEC_FLAG_EMU_EDGE)){
307
            w+= EDGE_WIDTH*2;
308
            h+= EDGE_WIDTH*2;
309
        }
310
        
311
        buf->last_pic_num= -256*256*256*64;
312

    
313
        for(i=0; i<3; i++){
314
            const int h_shift= i==0 ? 0 : h_chroma_shift;
315
            const int v_shift= i==0 ? 0 : v_chroma_shift;
316

    
317
            //FIXME next ensures that linesize= 2^x uvlinesize, thats needed because some MC code assumes it
318
            buf->linesize[i]= ALIGN(pixel_size*w>>h_shift, STRIDE_ALIGN<<(h_chroma_shift-h_shift)); 
319

    
320
            buf->base[i]= av_malloc((buf->linesize[i]*h>>v_shift)+16); //FIXME 16
321
            if(buf->base[i]==NULL) return -1;
322
            memset(buf->base[i], 128, buf->linesize[i]*h>>v_shift);
323
        
324
            if(s->flags&CODEC_FLAG_EMU_EDGE)
325
                buf->data[i] = buf->base[i];
326
            else
327
                buf->data[i] = buf->base[i] + ALIGN((buf->linesize[i]*EDGE_WIDTH>>v_shift) + (EDGE_WIDTH>>h_shift), STRIDE_ALIGN);
328
        }
329
        pic->age= 256*256*256*64;
330
    }
331
    pic->type= FF_BUFFER_TYPE_INTERNAL;
332

    
333
    for(i=0; i<4; i++){
334
        pic->base[i]= buf->base[i];
335
        pic->data[i]= buf->data[i];
336
        pic->linesize[i]= buf->linesize[i];
337
    }
338
    s->internal_buffer_count++;
339

    
340
    return 0;
341
}
342

    
343
void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic){
344
    int i;
345
    InternalBuffer *buf, *last, temp;
346

    
347
    assert(pic->type==FF_BUFFER_TYPE_INTERNAL);
348
    assert(s->internal_buffer_count);
349

    
350
    buf = NULL; /* avoids warning */
351
    for(i=0; i<s->internal_buffer_count; i++){ //just 3-5 checks so is not worth to optimize
352
        buf= &((InternalBuffer*)s->internal_buffer)[i];
353
        if(buf->data[0] == pic->data[0])
354
            break;
355
    }
356
    assert(i < s->internal_buffer_count);
357
    s->internal_buffer_count--;
358
    last = &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
359

    
360
    temp= *buf;
361
    *buf= *last;
362
    *last= temp;
363

    
364
    for(i=0; i<3; i++){
365
        pic->data[i]=NULL;
366
//        pic->base[i]=NULL;
367
    }
368
//printf("R%X\n", pic->opaque);
369
}
370

    
371
int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic){
372
    AVFrame temp_pic;
373
    int i;
374

    
375
    /* If no picture return a new buffer */
376
    if(pic->data[0] == NULL) {
377
        /* We will copy from buffer, so must be readable */
378
        pic->buffer_hints |= FF_BUFFER_HINTS_READABLE;
379
        return s->get_buffer(s, pic);
380
    }
381

    
382
    /* If internal buffer type return the same buffer */
383
    if(pic->type == FF_BUFFER_TYPE_INTERNAL)
384
        return 0;
385

    
386
    /*
387
     * Not internal type and reget_buffer not overridden, emulate cr buffer
388
     */
389
    temp_pic = *pic;
390
    for(i = 0; i < 4; i++)
391
        pic->data[i] = pic->base[i] = NULL;
392
    pic->opaque = NULL;
393
    /* Allocate new frame */
394
    if (s->get_buffer(s, pic))
395
        return -1;
396
    /* Copy image data from old buffer to new buffer */
397
    img_copy((AVPicture*)pic, (AVPicture*)&temp_pic, s->pix_fmt, s->width,
398
             s->height);
399
    s->release_buffer(s, &temp_pic); // Release old frame
400
    return 0;
401
}
402

    
403
int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void **arg, int *ret, int count){
404
    int i;
405

    
406
    for(i=0; i<count; i++){
407
        int r= func(c, arg[i]);
408
        if(ret) ret[i]= r;
409
    }
410
    return 0;
411
}
412

    
413
enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat * fmt){
414
    return fmt[0];
415
}
416

    
417
static const char* context_to_name(void* ptr) {
418
    AVCodecContext *avc= ptr;
419

    
420
    if(avc && avc->codec && avc->codec->name)
421
        return avc->codec->name; 
422
    else
423
        return "NULL";
424
}
425

    
426
static AVClass av_codec_context_class = { "AVCodecContext", context_to_name };
427

    
428
void avcodec_get_context_defaults(AVCodecContext *s){
429
    memset(s, 0, sizeof(AVCodecContext));
430

    
431
    s->av_class= &av_codec_context_class;
432
    s->bit_rate= 800*1000;
433
    s->bit_rate_tolerance= s->bit_rate*10;
434
    s->qmin= 2;
435
    s->qmax= 31;
436
    s->mb_lmin= FF_QP2LAMBDA * 2;
437
    s->mb_lmax= FF_QP2LAMBDA * 31;
438
    s->rc_eq= "tex^qComp";
439
    s->qcompress= 0.5;
440
    s->max_qdiff= 3;
441
    s->b_quant_factor=1.25;
442
    s->b_quant_offset=1.25;
443
    s->i_quant_factor=-0.8;
444
    s->i_quant_offset=0.0;
445
    s->error_concealment= 3;
446
    s->error_resilience= 1;
447
    s->workaround_bugs= FF_BUG_AUTODETECT;
448
    s->time_base= (AVRational){0,1};
449
    s->gop_size= 50;
450
    s->me_method= ME_EPZS;
451
    s->get_buffer= avcodec_default_get_buffer;
452
    s->release_buffer= avcodec_default_release_buffer;
453
    s->get_format= avcodec_default_get_format;
454
    s->execute= avcodec_default_execute;
455
    s->thread_count=1;
456
    s->me_subpel_quality=8;
457
    s->lmin= FF_QP2LAMBDA * s->qmin;
458
    s->lmax= FF_QP2LAMBDA * s->qmax;
459
    s->sample_aspect_ratio= (AVRational){0,1};
460
    s->ildct_cmp= FF_CMP_VSAD;
461
    s->profile= FF_PROFILE_UNKNOWN;
462
    s->level= FF_LEVEL_UNKNOWN;
463
    s->me_penalty_compensation= 256;
464
    s->pix_fmt= PIX_FMT_NONE;
465
    
466
    s->intra_quant_bias= FF_DEFAULT_QUANT_BIAS;
467
    s->inter_quant_bias= FF_DEFAULT_QUANT_BIAS;
468
    s->palctrl = NULL;
469
    s->reget_buffer= avcodec_default_reget_buffer;
470
}
471

    
472
/**
473
 * allocates a AVCodecContext and set it to defaults.
474
 * this can be deallocated by simply calling free() 
475
 */
476
AVCodecContext *avcodec_alloc_context(void){
477
    AVCodecContext *avctx= av_malloc(sizeof(AVCodecContext));
478
    
479
    if(avctx==NULL) return NULL;
480
    
481
    avcodec_get_context_defaults(avctx);
482
    
483
    return avctx;
484
}
485

    
486
void avcodec_get_frame_defaults(AVFrame *pic){
487
    memset(pic, 0, sizeof(AVFrame));
488

    
489
    pic->pts= AV_NOPTS_VALUE;
490
    pic->key_frame= 1;
491
}
492

    
493
/**
494
 * allocates a AVPFrame and set it to defaults.
495
 * this can be deallocated by simply calling free() 
496
 */
497
AVFrame *avcodec_alloc_frame(void){
498
    AVFrame *pic= av_malloc(sizeof(AVFrame));
499
    
500
    if(pic==NULL) return NULL;
501
    
502
    avcodec_get_frame_defaults(pic);
503
    
504
    return pic;
505
}
506

    
507
int avcodec_open(AVCodecContext *avctx, AVCodec *codec)
508
{
509
    int ret= -1;
510
    
511
    entangled_thread_counter++;
512
    if(entangled_thread_counter != 1){
513
        av_log(avctx, AV_LOG_ERROR, "insufficient thread locking around avcodec_open/close()\n");
514
        goto end;
515
    }
516

    
517
    if(avctx->codec)
518
        goto end;
519

    
520
    avctx->codec = codec;
521
    avctx->codec_id = codec->id;
522
    avctx->frame_number = 0;
523
    if (codec->priv_data_size > 0) {
524
        avctx->priv_data = av_mallocz(codec->priv_data_size);
525
        if (!avctx->priv_data) 
526
            goto end;
527
    } else {
528
        avctx->priv_data = NULL;
529
    }
530

    
531
    if(avctx->coded_width && avctx->coded_height)
532
        avcodec_set_dimensions(avctx, avctx->coded_width, avctx->coded_height);
533
    else if(avctx->width && avctx->height)
534
        avcodec_set_dimensions(avctx, avctx->width, avctx->height);
535

    
536
    if((avctx->coded_width||avctx->coded_height) && avcodec_check_dimensions(avctx,avctx->coded_width,avctx->coded_height)){
537
        av_freep(&avctx->priv_data);
538
        goto end;
539
    }
540

    
541
    ret = avctx->codec->init(avctx);
542
    if (ret < 0) {
543
        av_freep(&avctx->priv_data);
544
        goto end;
545
    }
546
    ret=0;
547
end:
548
    entangled_thread_counter--;
549
    return ret;
550
}
551

    
552
int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size, 
553
                         const short *samples)
554
{
555
    if(buf_size < FF_MIN_BUFFER_SIZE && 0){
556
        av_log(avctx, AV_LOG_ERROR, "buffer smaller then minimum size\n");
557
        return -1;
558
    }
559
    if((avctx->codec->capabilities & CODEC_CAP_DELAY) || samples){
560
        int ret = avctx->codec->encode(avctx, buf, buf_size, (void *)samples);
561
        avctx->frame_number++;
562
        return ret;
563
    }else
564
        return 0;
565
}
566

    
567
int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size, 
568
                         const AVFrame *pict)
569
{
570
    if(buf_size < FF_MIN_BUFFER_SIZE){
571
        av_log(avctx, AV_LOG_ERROR, "buffer smaller then minimum size\n");
572
        return -1;
573
    }
574
    if(avcodec_check_dimensions(avctx,avctx->width,avctx->height))
575
        return -1;
576
    if((avctx->codec->capabilities & CODEC_CAP_DELAY) || pict){
577
        int ret = avctx->codec->encode(avctx, buf, buf_size, (void *)pict);
578
        avctx->frame_number++;
579
        emms_c(); //needed to avoid an emms_c() call before every return;
580
    
581
        return ret;
582
    }else
583
        return 0;
584
}
585

    
586
int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size, 
587
                            const AVSubtitle *sub)
588
{
589
    int ret;
590
    ret = avctx->codec->encode(avctx, buf, buf_size, (void *)sub);
591
    avctx->frame_number++;
592
    return ret;
593
}
594

    
595
/** 
596
 * decode a frame. 
597
 * @param buf bitstream buffer, must be FF_INPUT_BUFFER_PADDING_SIZE larger then the actual read bytes
598
 * because some optimized bitstream readers read 32 or 64 bit at once and could read over the end
599
 * @param buf_size the size of the buffer in bytes
600
 * @param got_picture_ptr zero if no frame could be decompressed, Otherwise, it is non zero
601
 * @return -1 if error, otherwise return the number of
602
 * bytes used. 
603
 */
604
int avcodec_decode_video(AVCodecContext *avctx, AVFrame *picture, 
605
                         int *got_picture_ptr,
606
                         uint8_t *buf, int buf_size)
607
{
608
    int ret;
609
    
610
    *got_picture_ptr= 0;
611
    if((avctx->coded_width||avctx->coded_height) && avcodec_check_dimensions(avctx,avctx->coded_width,avctx->coded_height))
612
        return -1;
613
    if((avctx->codec->capabilities & CODEC_CAP_DELAY) || buf_size){
614
        ret = avctx->codec->decode(avctx, picture, got_picture_ptr, 
615
                                buf, buf_size);
616

    
617
        emms_c(); //needed to avoid an emms_c() call before every return;
618
    
619
        if (*got_picture_ptr)                           
620
            avctx->frame_number++;
621
    }else
622
        ret= 0;
623

    
624
    return ret;
625
}
626

    
627
/* decode an audio frame. return -1 if error, otherwise return the
628
   *number of bytes used. If no frame could be decompressed,
629
   *frame_size_ptr is zero. Otherwise, it is the decompressed frame
630
   *size in BYTES. */
631
int avcodec_decode_audio(AVCodecContext *avctx, int16_t *samples, 
632
                         int *frame_size_ptr,
633
                         uint8_t *buf, int buf_size)
634
{
635
    int ret;
636

    
637
    *frame_size_ptr= 0;
638
    if((avctx->codec->capabilities & CODEC_CAP_DELAY) || buf_size){
639
        ret = avctx->codec->decode(avctx, samples, frame_size_ptr, 
640
                                buf, buf_size);
641
        avctx->frame_number++;
642
    }else
643
        ret= 0;
644
    return ret;
645
}
646

    
647
/* decode a subtitle message. return -1 if error, otherwise return the
648
   *number of bytes used. If no subtitle could be decompressed,
649
   *got_sub_ptr is zero. Otherwise, the subtitle is stored in *sub. */
650
int avcodec_decode_subtitle(AVCodecContext *avctx, AVSubtitle *sub,
651
                            int *got_sub_ptr,
652
                            const uint8_t *buf, int buf_size)
653
{
654
    int ret;
655

    
656
    *got_sub_ptr = 0;
657
    ret = avctx->codec->decode(avctx, sub, got_sub_ptr, 
658
                               (uint8_t *)buf, buf_size);
659
    if (*got_sub_ptr)
660
        avctx->frame_number++;
661
    return ret;
662
}
663

    
664
int avcodec_close(AVCodecContext *avctx)
665
{
666
    entangled_thread_counter++;
667
    if(entangled_thread_counter != 1){
668
        av_log(avctx, AV_LOG_ERROR, "insufficient thread locking around avcodec_open/close()\n");
669
        entangled_thread_counter--;
670
        return -1;
671
    }
672

    
673
    if (avctx->codec->close)
674
        avctx->codec->close(avctx);
675
    avcodec_default_free_buffers(avctx);
676
    av_freep(&avctx->priv_data);
677
    avctx->codec = NULL;
678
    entangled_thread_counter--;
679
    return 0;
680
}
681

    
682
AVCodec *avcodec_find_encoder(enum CodecID id)
683
{
684
    AVCodec *p;
685
    p = first_avcodec;
686
    while (p) {
687
        if (p->encode != NULL && p->id == id)
688
            return p;
689
        p = p->next;
690
    }
691
    return NULL;
692
}
693

    
694
AVCodec *avcodec_find_encoder_by_name(const char *name)
695
{
696
    AVCodec *p;
697
    p = first_avcodec;
698
    while (p) {
699
        if (p->encode != NULL && strcmp(name,p->name) == 0)
700
            return p;
701
        p = p->next;
702
    }
703
    return NULL;
704
}
705

    
706
AVCodec *avcodec_find_decoder(enum CodecID id)
707
{
708
    AVCodec *p;
709
    p = first_avcodec;
710
    while (p) {
711
        if (p->decode != NULL && p->id == id)
712
            return p;
713
        p = p->next;
714
    }
715
    return NULL;
716
}
717

    
718
AVCodec *avcodec_find_decoder_by_name(const char *name)
719
{
720
    AVCodec *p;
721
    p = first_avcodec;
722
    while (p) {
723
        if (p->decode != NULL && strcmp(name,p->name) == 0)
724
            return p;
725
        p = p->next;
726
    }
727
    return NULL;
728
}
729

    
730
void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)
731
{
732
    const char *codec_name;
733
    AVCodec *p;
734
    char buf1[32];
735
    char channels_str[100];
736
    int bitrate;
737

    
738
    if (encode)
739
        p = avcodec_find_encoder(enc->codec_id);
740
    else
741
        p = avcodec_find_decoder(enc->codec_id);
742

    
743
    if (p) {
744
        codec_name = p->name;
745
        if (!encode && enc->codec_id == CODEC_ID_MP3) {
746
            if (enc->sub_id == 2)
747
                codec_name = "mp2";
748
            else if (enc->sub_id == 1)
749
                codec_name = "mp1";
750
        }
751
    } else if (enc->codec_id == CODEC_ID_MPEG2TS) {
752
        /* fake mpeg2 transport stream codec (currently not
753
           registered) */
754
        codec_name = "mpeg2ts";
755
    } else if (enc->codec_name[0] != '\0') {
756
        codec_name = enc->codec_name;
757
    } else {
758
        /* output avi tags */
759
        if (enc->codec_type == CODEC_TYPE_VIDEO) {
760
            snprintf(buf1, sizeof(buf1), "%c%c%c%c", 
761
                     enc->codec_tag & 0xff,
762
                     (enc->codec_tag >> 8) & 0xff,
763
                     (enc->codec_tag >> 16) & 0xff,
764
                     (enc->codec_tag >> 24) & 0xff);
765
        } else {
766
            snprintf(buf1, sizeof(buf1), "0x%04x", enc->codec_tag);
767
        }
768
        codec_name = buf1;
769
    }
770

    
771
    switch(enc->codec_type) {
772
    case CODEC_TYPE_VIDEO:
773
        snprintf(buf, buf_size,
774
                 "Video: %s%s",
775
                 codec_name, enc->mb_decision ? " (hq)" : "");
776
        if (enc->pix_fmt != PIX_FMT_NONE) {
777
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
778
                     ", %s",
779
                     avcodec_get_pix_fmt_name(enc->pix_fmt));
780
        }
781
        if (enc->width) {
782
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
783
                     ", %dx%d, %0.2f fps",
784
                     enc->width, enc->height, 
785
                     1/av_q2d(enc->time_base));
786
        }
787
        if (encode) {
788
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
789
                     ", q=%d-%d", enc->qmin, enc->qmax);
790
        }
791
        bitrate = enc->bit_rate;
792
        break;
793
    case CODEC_TYPE_AUDIO:
794
        snprintf(buf, buf_size,
795
                 "Audio: %s",
796
                 codec_name);
797
        switch (enc->channels) {
798
            case 1:
799
                strcpy(channels_str, "mono");
800
                break;
801
            case 2:
802
                strcpy(channels_str, "stereo");
803
                break;
804
            case 6:
805
                strcpy(channels_str, "5:1");
806
                break;
807
            default:
808
                snprintf(channels_str, sizeof(channels_str), "%d channels", enc->channels);
809
                break;
810
        }
811
        if (enc->sample_rate) {
812
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
813
                     ", %d Hz, %s",
814
                     enc->sample_rate,
815
                     channels_str);
816
        }
817
        
818
        /* for PCM codecs, compute bitrate directly */
819
        switch(enc->codec_id) {
820
        case CODEC_ID_PCM_S16LE:
821
        case CODEC_ID_PCM_S16BE:
822
        case CODEC_ID_PCM_U16LE:
823
        case CODEC_ID_PCM_U16BE:
824
            bitrate = enc->sample_rate * enc->channels * 16;
825
            break;
826
        case CODEC_ID_PCM_S8:
827
        case CODEC_ID_PCM_U8:
828
        case CODEC_ID_PCM_ALAW:
829
        case CODEC_ID_PCM_MULAW:
830
            bitrate = enc->sample_rate * enc->channels * 8;
831
            break;
832
        default:
833
            bitrate = enc->bit_rate;
834
            break;
835
        }
836
        break;
837
    case CODEC_TYPE_DATA:
838
        snprintf(buf, buf_size, "Data: %s", codec_name);
839
        bitrate = enc->bit_rate;
840
        break;
841
    case CODEC_TYPE_SUBTITLE:
842
        snprintf(buf, buf_size, "Subtitle: %s", codec_name);
843
        bitrate = enc->bit_rate;
844
        break;
845
    default:
846
        snprintf(buf, buf_size, "Invalid Codec type %d", enc->codec_type);
847
        return;
848
    }
849
    if (encode) {
850
        if (enc->flags & CODEC_FLAG_PASS1)
851
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
852
                     ", pass 1");
853
        if (enc->flags & CODEC_FLAG_PASS2)
854
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
855
                     ", pass 2");
856
    }
857
    if (bitrate != 0) {
858
        snprintf(buf + strlen(buf), buf_size - strlen(buf), 
859
                 ", %d kb/s", bitrate / 1000);
860
    }
861
}
862

    
863
unsigned avcodec_version( void )
864
{
865
  return LIBAVCODEC_VERSION_INT;
866
}
867

    
868
unsigned avcodec_build( void )
869
{
870
  return LIBAVCODEC_BUILD;
871
}
872

    
873
/* must be called before any other functions */
874
void avcodec_init(void)
875
{
876
    static int inited = 0;
877

    
878
    if (inited != 0)
879
        return;
880
    inited = 1;
881

    
882
    dsputil_static_init();
883
}
884

    
885
/**
886
 * Flush buffers, should be called when seeking or when swicthing to a different stream.
887
 */
888
void avcodec_flush_buffers(AVCodecContext *avctx)
889
{
890
    if(avctx->codec->flush)
891
        avctx->codec->flush(avctx);
892
}
893

    
894
void avcodec_default_free_buffers(AVCodecContext *s){
895
    int i, j;
896

    
897
    if(s->internal_buffer==NULL) return;
898
    
899
    for(i=0; i<INTERNAL_BUFFER_SIZE; i++){
900
        InternalBuffer *buf= &((InternalBuffer*)s->internal_buffer)[i];
901
        for(j=0; j<4; j++){
902
            av_freep(&buf->base[j]);
903
            buf->data[j]= NULL;
904
        }
905
    }
906
    av_freep(&s->internal_buffer);
907
    
908
    s->internal_buffer_count=0;
909
}
910

    
911
char av_get_pict_type_char(int pict_type){
912
    switch(pict_type){
913
    case I_TYPE: return 'I'; 
914
    case P_TYPE: return 'P'; 
915
    case B_TYPE: return 'B'; 
916
    case S_TYPE: return 'S'; 
917
    case SI_TYPE:return 'i'; 
918
    case SP_TYPE:return 'p'; 
919
    default:     return '?';
920
    }
921
}
922

    
923
/* av_log API */
924

    
925
static int av_log_level = AV_LOG_INFO;
926

    
927
static void av_log_default_callback(void* ptr, int level, const char* fmt, va_list vl)
928
{
929
    static int print_prefix=1;
930
    AVClass* avc= ptr ? *(AVClass**)ptr : NULL;
931
    if(level>av_log_level)
932
        return;
933
#undef fprintf
934
    if(print_prefix && avc) {
935
            fprintf(stderr, "[%s @ %p]", avc->item_name(ptr), avc);
936
    }
937
#define fprintf please_use_av_log
938
        
939
    print_prefix= strstr(fmt, "\n") != NULL;
940
        
941
    vfprintf(stderr, fmt, vl);
942
}
943

    
944
static void (*av_log_callback)(void*, int, const char*, va_list) = av_log_default_callback;
945

    
946
void av_log(void* avcl, int level, const char *fmt, ...)
947
{
948
    va_list vl;
949
    va_start(vl, fmt);
950
    av_vlog(avcl, level, fmt, vl);
951
    va_end(vl);
952
}
953

    
954
void av_vlog(void* avcl, int level, const char *fmt, va_list vl)
955
{
956
    av_log_callback(avcl, level, fmt, vl);
957
}
958

    
959
int av_log_get_level(void)
960
{
961
    return av_log_level;
962
}
963

    
964
void av_log_set_level(int level)
965
{
966
    av_log_level = level;
967
}
968

    
969
void av_log_set_callback(void (*callback)(void*, int, const char*, va_list))
970
{
971
    av_log_callback = callback;
972
}
973

    
974
#if !defined(HAVE_THREADS)
975
int avcodec_thread_init(AVCodecContext *s, int thread_count){
976
    return -1;
977
}
978
#endif
979

    
980
unsigned int av_xiphlacing(unsigned char *s, unsigned int v)
981
{
982
    unsigned int n = 0;
983

    
984
    while(v >= 0xff) {
985
        *s++ = 0xff;
986
        v -= 0xff;
987
        n++;
988
    }
989
    *s = v;
990
    n++;
991
    return n;
992
}