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ffmpeg / libavformat / aviobuf.c @ 7cb8f314

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1
/*
2
 * Buffered I/O for ffmpeg system
3
 * Copyright (c) 2000,2001 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
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 * version 2 of the License, or (at your option) any later version.
9
 *
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 * 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
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 * License along with this library; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
18
 */
19
#include "avformat.h"
20
#include "avio.h"
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#include <stdarg.h>
22

    
23
#define IO_BUFFER_SIZE 32768
24

    
25
int init_put_byte(ByteIOContext *s,
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                  unsigned char *buffer,
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                  int buffer_size,
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                  int write_flag,
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                  void *opaque,
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                  int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
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                  int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
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                  offset_t (*seek)(void *opaque, offset_t offset, int whence))
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{
34
    s->buffer = buffer;
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    s->buffer_size = buffer_size;
36
    s->buf_ptr = buffer;
37
    s->write_flag = write_flag;
38
    if (!s->write_flag) 
39
        s->buf_end = buffer;
40
    else
41
        s->buf_end = buffer + buffer_size;
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    s->opaque = opaque;
43
    s->write_packet = write_packet;
44
    s->read_packet = read_packet;
45
    s->seek = seek;
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    s->pos = 0;
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    s->must_flush = 0;
48
    s->eof_reached = 0;
49
    s->error = 0;
50
    s->is_streamed = 0;
51
    s->max_packet_size = 0;
52
    s->update_checksum= NULL;
53
    return 0;
54
}
55
                  
56

    
57
#ifdef CONFIG_ENCODERS
58
static void flush_buffer(ByteIOContext *s)
59
{
60
    if (s->buf_ptr > s->buffer) {
61
        if (s->write_packet && !s->error){
62
            int ret= s->write_packet(s->opaque, s->buffer, s->buf_ptr - s->buffer);
63
            if(ret < 0){
64
                s->error = ret;
65
            }
66
        }
67
        if(s->update_checksum){
68
            s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
69
            s->checksum_ptr= s->buffer;
70
        }
71
        s->pos += s->buf_ptr - s->buffer;
72
    }
73
    s->buf_ptr = s->buffer;
74
}
75

    
76
void put_byte(ByteIOContext *s, int b)
77
{
78
    *(s->buf_ptr)++ = b;
79
    if (s->buf_ptr >= s->buf_end) 
80
        flush_buffer(s);
81
}
82

    
83
void put_buffer(ByteIOContext *s, const unsigned char *buf, int size)
84
{
85
    int len;
86

    
87
    while (size > 0) {
88
        len = (s->buf_end - s->buf_ptr);
89
        if (len > size)
90
            len = size;
91
        memcpy(s->buf_ptr, buf, len);
92
        s->buf_ptr += len;
93

    
94
        if (s->buf_ptr >= s->buf_end) 
95
            flush_buffer(s);
96

    
97
        buf += len;
98
        size -= len;
99
    }
100
}
101

    
102
void put_flush_packet(ByteIOContext *s)
103
{
104
    flush_buffer(s);
105
    s->must_flush = 0;
106
}
107
#endif //CONFIG_ENCODERS
108

    
109
offset_t url_fseek(ByteIOContext *s, offset_t offset, int whence)
110
{
111
    offset_t offset1;
112

    
113
    if (whence != SEEK_CUR && whence != SEEK_SET)
114
        return -EINVAL;
115
    
116
#ifdef CONFIG_ENCODERS
117
    if (s->write_flag) {
118
        if (whence == SEEK_CUR) {
119
            offset1 = s->pos + (s->buf_ptr - s->buffer);
120
            if (offset == 0)
121
                return offset1;
122
            offset += offset1;
123
        }
124
        offset1 = offset - s->pos;
125
        if (!s->must_flush && 
126
            offset1 >= 0 && offset1 < (s->buf_end - s->buffer)) {
127
            /* can do the seek inside the buffer */
128
            s->buf_ptr = s->buffer + offset1;
129
        } else {
130
            if (!s->seek)
131
                return -EPIPE;
132
            flush_buffer(s);
133
            s->must_flush = 1;
134
            s->buf_ptr = s->buffer;
135
            s->seek(s->opaque, offset, SEEK_SET);
136
            s->pos = offset;
137
        }
138
    } else 
139
#endif //CONFIG_ENCODERS
140
    {
141
        if (whence == SEEK_CUR) {
142
            offset1 = s->pos - (s->buf_end - s->buffer) + (s->buf_ptr - s->buffer);
143
            if (offset == 0)
144
                return offset1;
145
            offset += offset1;
146
        }
147
        offset1 = offset - (s->pos - (s->buf_end - s->buffer));
148
        if (offset1 >= 0 && offset1 <= (s->buf_end - s->buffer)) {
149
            /* can do the seek inside the buffer */
150
            s->buf_ptr = s->buffer + offset1;
151
        } else {
152
            if (!s->seek)
153
                return -EPIPE;
154
            s->buf_ptr = s->buffer;
155
            s->buf_end = s->buffer;
156
            if (s->seek(s->opaque, offset, SEEK_SET) == (offset_t)-EPIPE)
157
                return -EPIPE;
158
            s->pos = offset;
159
        }
160
        s->eof_reached = 0;
161
    }
162
    return offset;
163
}
164

    
165
void url_fskip(ByteIOContext *s, offset_t offset)
166
{
167
    url_fseek(s, offset, SEEK_CUR);
168
}
169

    
170
offset_t url_ftell(ByteIOContext *s)
171
{
172
    return url_fseek(s, 0, SEEK_CUR);
173
}
174

    
175
offset_t url_fsize(ByteIOContext *s)
176
{
177
    offset_t size;
178
    
179
    if (!s->seek)
180
        return -EPIPE;
181
    size = s->seek(s->opaque, -1, SEEK_END) + 1;
182
    s->seek(s->opaque, s->pos, SEEK_SET);
183
    return size;
184
}
185

    
186
int url_feof(ByteIOContext *s)
187
{
188
    return s->eof_reached;
189
}
190

    
191
int url_ferror(ByteIOContext *s)
192
{
193
    return s->error;
194
}
195

    
196
#ifdef CONFIG_ENCODERS
197
void put_le32(ByteIOContext *s, unsigned int val)
198
{
199
    put_byte(s, val);
200
    put_byte(s, val >> 8);
201
    put_byte(s, val >> 16);
202
    put_byte(s, val >> 24);
203
}
204

    
205
void put_be32(ByteIOContext *s, unsigned int val)
206
{
207
    put_byte(s, val >> 24);
208
    put_byte(s, val >> 16);
209
    put_byte(s, val >> 8);
210
    put_byte(s, val);
211
}
212

    
213
void put_strz(ByteIOContext *s, const char *str)
214
{
215
    if (str)
216
        put_buffer(s, (const unsigned char *) str, strlen(str) + 1);
217
    else
218
        put_byte(s, 0);
219
}
220

    
221
void put_le64(ByteIOContext *s, uint64_t val)
222
{
223
    put_le32(s, (uint32_t)(val & 0xffffffff));
224
    put_le32(s, (uint32_t)(val >> 32));
225
}
226

    
227
void put_be64(ByteIOContext *s, uint64_t val)
228
{
229
    put_be32(s, (uint32_t)(val >> 32));
230
    put_be32(s, (uint32_t)(val & 0xffffffff));
231
}
232

    
233
void put_le16(ByteIOContext *s, unsigned int val)
234
{
235
    put_byte(s, val);
236
    put_byte(s, val >> 8);
237
}
238

    
239
void put_be16(ByteIOContext *s, unsigned int val)
240
{
241
    put_byte(s, val >> 8);
242
    put_byte(s, val);
243
}
244

    
245
void put_be24(ByteIOContext *s, unsigned int val)
246
{
247
    put_be16(s, val >> 8);
248
    put_byte(s, val);
249
}
250

    
251
void put_tag(ByteIOContext *s, const char *tag)
252
{
253
    while (*tag) {
254
        put_byte(s, *tag++);
255
    }
256
}
257
#endif //CONFIG_ENCODERS
258

    
259
/* Input stream */
260

    
261
static void fill_buffer(ByteIOContext *s)
262
{
263
    int len;
264

    
265
    /* no need to do anything if EOF already reached */
266
    if (s->eof_reached)
267
        return;
268

    
269
    if(s->update_checksum){
270
        if(s->buf_end > s->checksum_ptr)
271
            s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_end - s->checksum_ptr);
272
        s->checksum_ptr= s->buffer;
273
    }
274

    
275
    len = s->read_packet(s->opaque, s->buffer, s->buffer_size);
276
    if (len <= 0) {
277
        /* do not modify buffer if EOF reached so that a seek back can
278
           be done without rereading data */
279
        s->eof_reached = 1;
280
    if(len<0)
281
        s->error= len;
282
    } else {
283
        s->pos += len;
284
        s->buf_ptr = s->buffer;
285
        s->buf_end = s->buffer + len;
286
    }
287
}
288

    
289
unsigned long get_checksum(ByteIOContext *s){
290
    s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
291
    s->update_checksum= NULL;
292
    return s->checksum;
293
}
294

    
295
void init_checksum(ByteIOContext *s, unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len), unsigned long checksum){
296
    s->update_checksum= update_checksum;
297
    if(s->update_checksum){
298
        s->checksum= s->update_checksum(checksum, NULL, 0);
299
        s->checksum_ptr= s->buf_ptr;
300
    }
301
}
302

    
303
/* NOTE: return 0 if EOF, so you cannot use it if EOF handling is
304
   necessary */
305
/* XXX: put an inline version */
306
int get_byte(ByteIOContext *s)
307
{
308
    if (s->buf_ptr < s->buf_end) {
309
        return *s->buf_ptr++;
310
    } else {
311
        fill_buffer(s);
312
        if (s->buf_ptr < s->buf_end)
313
            return *s->buf_ptr++;
314
        else
315
            return 0;
316
    }
317
}
318

    
319
/* NOTE: return URL_EOF (-1) if EOF */
320
int url_fgetc(ByteIOContext *s)
321
{
322
    if (s->buf_ptr < s->buf_end) {
323
        return *s->buf_ptr++;
324
    } else {
325
        fill_buffer(s);
326
        if (s->buf_ptr < s->buf_end)
327
            return *s->buf_ptr++;
328
        else
329
            return URL_EOF;
330
    }
331
}
332

    
333
int get_buffer(ByteIOContext *s, unsigned char *buf, int size)
334
{
335
    int len, size1;
336

    
337
    size1 = size;
338
    while (size > 0) {
339
        len = s->buf_end - s->buf_ptr;
340
        if (len > size)
341
            len = size;
342
        if (len == 0) {
343
            if(size > s->buffer_size && !s->update_checksum){
344
                len = s->read_packet(s->opaque, buf, size);
345
                if (len <= 0) {
346
                    /* do not modify buffer if EOF reached so that a seek back can
347
                    be done without rereading data */
348
                    s->eof_reached = 1;
349
                    if(len<0)
350
                        s->error= len;
351
                    break;
352
                } else {
353
                    s->pos += len;
354
                    size -= len;
355
                    buf += len;
356
                    s->buf_ptr = s->buffer;
357
                    s->buf_end = s->buffer/* + len*/;
358
                }
359
            }else{
360
                fill_buffer(s);
361
                len = s->buf_end - s->buf_ptr;
362
                if (len == 0)
363
                    break;
364
            }
365
        } else {
366
            memcpy(buf, s->buf_ptr, len);
367
            buf += len;
368
            s->buf_ptr += len;
369
            size -= len;
370
        }
371
    }
372
    return size1 - size;
373
}
374

    
375
int get_partial_buffer(ByteIOContext *s, unsigned char *buf, int size)
376
{
377
    int len;
378
    
379
    if(size<0)
380
        return -1;
381

    
382
    len = s->buf_end - s->buf_ptr;
383
    if (len == 0) {
384
        fill_buffer(s);
385
        len = s->buf_end - s->buf_ptr;
386
    }
387
    if (len > size)
388
        len = size;
389
    memcpy(buf, s->buf_ptr, len);
390
    s->buf_ptr += len;
391
    return len;
392
}
393

    
394
unsigned int get_le16(ByteIOContext *s)
395
{
396
    unsigned int val;
397
    val = get_byte(s);
398
    val |= get_byte(s) << 8;
399
    return val;
400
}
401

    
402
unsigned int get_le32(ByteIOContext *s)
403
{
404
    unsigned int val;
405
    val = get_le16(s);
406
    val |= get_le16(s) << 16;
407
    return val;
408
}
409

    
410
uint64_t get_le64(ByteIOContext *s)
411
{
412
    uint64_t val;
413
    val = (uint64_t)get_le32(s);
414
    val |= (uint64_t)get_le32(s) << 32;
415
    return val;
416
}
417

    
418
unsigned int get_be16(ByteIOContext *s)
419
{
420
    unsigned int val;
421
    val = get_byte(s) << 8;
422
    val |= get_byte(s);
423
    return val;
424
}
425

    
426
unsigned int get_be24(ByteIOContext *s)
427
{
428
    unsigned int val;
429
    val = get_be16(s) << 8;
430
    val |= get_byte(s);
431
    return val;
432
}
433
unsigned int get_be32(ByteIOContext *s)
434
{
435
    unsigned int val;
436
    val = get_be16(s) << 16;
437
    val |= get_be16(s);
438
    return val;
439
}
440

    
441
char *get_strz(ByteIOContext *s, char *buf, int maxlen)
442
{
443
    int i = 0;
444
    char c;
445

    
446
    while ((c = get_byte(s))) {
447
        if (i < maxlen-1)
448
            buf[i++] = c;
449
    }
450
    
451
    buf[i] = 0; /* Ensure null terminated, but may be truncated */
452

    
453
    return buf;
454
}
455

    
456
uint64_t get_be64(ByteIOContext *s)
457
{
458
    uint64_t val;
459
    val = (uint64_t)get_be32(s) << 32;
460
    val |= (uint64_t)get_be32(s);
461
    return val;
462
}
463

    
464
/* link with avio functions */
465

    
466
#ifdef CONFIG_ENCODERS
467
static int url_write_packet(void *opaque, uint8_t *buf, int buf_size)
468
{
469
    URLContext *h = opaque;
470
    return url_write(h, buf, buf_size);
471
}
472
#else
473
#define        url_write_packet NULL
474
#endif //CONFIG_ENCODERS
475

    
476
static int url_read_packet(void *opaque, uint8_t *buf, int buf_size)
477
{
478
    URLContext *h = opaque;
479
    return url_read(h, buf, buf_size);
480
}
481

    
482
static offset_t url_seek_packet(void *opaque, offset_t offset, int whence)
483
{
484
    URLContext *h = opaque;
485
    return url_seek(h, offset, whence);
486
    //return 0;
487
}
488

    
489
int url_fdopen(ByteIOContext *s, URLContext *h)
490
{
491
    uint8_t *buffer;
492
    int buffer_size, max_packet_size;
493

    
494
    
495
    max_packet_size = url_get_max_packet_size(h);
496
    if (max_packet_size) {
497
        buffer_size = max_packet_size; /* no need to bufferize more than one packet */
498
    } else {
499
        buffer_size = IO_BUFFER_SIZE;
500
    }
501
    buffer = av_malloc(buffer_size);
502
    if (!buffer)
503
        return -ENOMEM;
504

    
505
    if (init_put_byte(s, buffer, buffer_size, 
506
                      (h->flags & URL_WRONLY || h->flags & URL_RDWR), h,
507
                      url_read_packet, url_write_packet, url_seek_packet) < 0) {
508
        av_free(buffer);
509
        return AVERROR_IO;
510
    }
511
    s->is_streamed = h->is_streamed;
512
    s->max_packet_size = max_packet_size;
513
    return 0;
514
}
515

    
516
/* XXX: must be called before any I/O */
517
int url_setbufsize(ByteIOContext *s, int buf_size)
518
{
519
    uint8_t *buffer;
520
    buffer = av_malloc(buf_size);
521
    if (!buffer)
522
        return -ENOMEM;
523

    
524
    av_free(s->buffer);
525
    s->buffer = buffer;
526
    s->buffer_size = buf_size;
527
    s->buf_ptr = buffer;
528
    if (!s->write_flag) 
529
        s->buf_end = buffer;
530
    else
531
        s->buf_end = buffer + buf_size;
532
    return 0;
533
}
534

    
535
/* NOTE: when opened as read/write, the buffers are only used for
536
   reading */
537
int url_fopen(ByteIOContext *s, const char *filename, int flags)
538
{
539
    URLContext *h;
540
    int err;
541

    
542
    err = url_open(&h, filename, flags);
543
    if (err < 0)
544
        return err;
545
    err = url_fdopen(s, h);
546
    if (err < 0) {
547
        url_close(h);
548
        return err;
549
    }
550
    return 0;
551
}
552

    
553
int url_fclose(ByteIOContext *s)
554
{
555
    URLContext *h = s->opaque;
556
    
557
    av_free(s->buffer);
558
    memset(s, 0, sizeof(ByteIOContext));
559
    return url_close(h);
560
}
561

    
562
URLContext *url_fileno(ByteIOContext *s)
563
{
564
    return s->opaque;
565
}
566

    
567
#ifdef CONFIG_ENCODERS
568
/* XXX: currently size is limited */
569
int url_fprintf(ByteIOContext *s, const char *fmt, ...)
570
{
571
    va_list ap;
572
    char buf[4096];
573
    int ret;
574

    
575
    va_start(ap, fmt);
576
    ret = vsnprintf(buf, sizeof(buf), fmt, ap);
577
    va_end(ap);
578
    put_buffer(s, buf, strlen(buf));
579
    return ret;
580
}
581
#endif //CONFIG_ENCODERS
582

    
583
/* note: unlike fgets, the EOL character is not returned and a whole
584
   line is parsed. return NULL if first char read was EOF */
585
char *url_fgets(ByteIOContext *s, char *buf, int buf_size)
586
{
587
    int c;
588
    char *q;
589

    
590
    c = url_fgetc(s);
591
    if (c == EOF)
592
        return NULL;
593
    q = buf;
594
    for(;;) {
595
        if (c == EOF || c == '\n')
596
            break;
597
        if ((q - buf) < buf_size - 1)
598
            *q++ = c;
599
        c = url_fgetc(s);
600
    }
601
    if (buf_size > 0)
602
        *q = '\0';
603
    return buf;
604
}
605

    
606
/* 
607
 * Return the maximum packet size associated to packetized buffered file
608
 * handle. If the file is not packetized (stream like http or file on
609
 * disk), then 0 is returned.
610
 * 
611
 * @param h buffered file handle
612
 * @return maximum packet size in bytes
613
 */
614
int url_fget_max_packet_size(ByteIOContext *s)
615
{
616
    return s->max_packet_size;
617
}
618

    
619
#ifdef CONFIG_ENCODERS
620
/* buffer handling */
621
int url_open_buf(ByteIOContext *s, uint8_t *buf, int buf_size, int flags)
622
{
623
    return init_put_byte(s, buf, buf_size, 
624
                         (flags & URL_WRONLY || flags & URL_RDWR),
625
                         NULL, NULL, NULL, NULL);
626
}
627

    
628
/* return the written or read size */
629
int url_close_buf(ByteIOContext *s)
630
{
631
    put_flush_packet(s);
632
    return s->buf_ptr - s->buffer;
633
}
634

    
635
/* output in a dynamic buffer */
636

    
637
typedef struct DynBuffer {
638
    int pos, size, allocated_size;
639
    uint8_t *buffer;
640
    int io_buffer_size;
641
    uint8_t io_buffer[1];
642
} DynBuffer;
643

    
644
static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size)
645
{
646
    DynBuffer *d = opaque;
647
    int new_size, new_allocated_size;
648
    
649
    /* reallocate buffer if needed */
650
    new_size = d->pos + buf_size;
651
    new_allocated_size = d->allocated_size;
652
    if(new_size < d->pos || new_size > INT_MAX/2)
653
        return -1;
654
    while (new_size > new_allocated_size) {
655
        if (!new_allocated_size)
656
            new_allocated_size = new_size;
657
        else
658
            new_allocated_size += new_allocated_size / 2 + 1;    
659
    }
660
    
661
    if (new_allocated_size > d->allocated_size) {
662
        d->buffer = av_realloc(d->buffer, new_allocated_size);
663
        if(d->buffer == NULL)
664
             return -1234;
665
        d->allocated_size = new_allocated_size;
666
    }
667
    memcpy(d->buffer + d->pos, buf, buf_size);
668
    d->pos = new_size;
669
    if (d->pos > d->size)
670
        d->size = d->pos;
671
    return buf_size;
672
}
673

    
674
static int dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size)
675
{
676
    unsigned char buf1[4];
677
    int ret;
678

    
679
    /* packetized write: output the header */
680
    buf1[0] = (buf_size >> 24);
681
    buf1[1] = (buf_size >> 16);
682
    buf1[2] = (buf_size >> 8);
683
    buf1[3] = (buf_size);
684
    ret= dyn_buf_write(opaque, buf1, 4);
685
    if(ret < 0)
686
        return ret;
687

    
688
    /* then the data */
689
    return dyn_buf_write(opaque, buf, buf_size);
690
}
691

    
692
static offset_t dyn_buf_seek(void *opaque, offset_t offset, int whence)
693
{
694
    DynBuffer *d = opaque;
695

    
696
    if (whence == SEEK_CUR)
697
        offset += d->pos;
698
    else if (whence == SEEK_END)
699
        offset += d->size;
700
    if (offset < 0 || offset > 0x7fffffffLL)
701
        return -1;
702
    d->pos = offset;
703
    return 0;
704
}
705

    
706
static int url_open_dyn_buf_internal(ByteIOContext *s, int max_packet_size)
707
{
708
    DynBuffer *d;
709
    int io_buffer_size, ret;
710
    
711
    if (max_packet_size) 
712
        io_buffer_size = max_packet_size;
713
    else
714
        io_buffer_size = 1024;
715
        
716
    if(sizeof(DynBuffer) + io_buffer_size < io_buffer_size)
717
        return -1;
718
    d = av_malloc(sizeof(DynBuffer) + io_buffer_size);
719
    if (!d)
720
        return -1;
721
    d->io_buffer_size = io_buffer_size;
722
    d->buffer = NULL;
723
    d->pos = 0;
724
    d->size = 0;
725
    d->allocated_size = 0;
726
    ret = init_put_byte(s, d->io_buffer, io_buffer_size, 
727
                        1, d, NULL, 
728
                        max_packet_size ? dyn_packet_buf_write : dyn_buf_write, 
729
                        max_packet_size ? NULL : dyn_buf_seek);
730
    if (ret == 0) {
731
        s->max_packet_size = max_packet_size;
732
    }
733
    return ret;
734
}
735

    
736
/*
737
 * Open a write only memory stream.
738
 * 
739
 * @param s new IO context
740
 * @return zero if no error.
741
 */
742
int url_open_dyn_buf(ByteIOContext *s)
743
{
744
    return url_open_dyn_buf_internal(s, 0);
745
}
746

    
747
/*
748
 * Open a write only packetized memory stream with a maximum packet
749
 * size of 'max_packet_size'.  The stream is stored in a memory buffer
750
 * with a big endian 4 byte header giving the packet size in bytes.
751
 * 
752
 * @param s new IO context
753
 * @param max_packet_size maximum packet size (must be > 0) 
754
 * @return zero if no error.
755
 */
756
int url_open_dyn_packet_buf(ByteIOContext *s, int max_packet_size)
757
{
758
    if (max_packet_size <= 0)
759
        return -1;
760
    return url_open_dyn_buf_internal(s, max_packet_size);
761
}
762

    
763
/* 
764
 * Return the written size and a pointer to the buffer. The buffer
765
 *  must be freed with av_free(). 
766
 * @param s IO context
767
 * @param pointer to a byte buffer
768
 * @return the length of the byte buffer
769
 */
770
int url_close_dyn_buf(ByteIOContext *s, uint8_t **pbuffer)
771
{
772
    DynBuffer *d = s->opaque;
773
    int size;
774

    
775
    put_flush_packet(s);
776

    
777
    *pbuffer = d->buffer;
778
    size = d->size;
779
    av_free(d);
780
    return size;
781
}
782
#endif //CONFIG_ENCODERS