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ffmpeg / libavformat / aviobuf.c @ 5f097703

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1
/*
2
 * Buffered I/O for ffmpeg system
3
 * Copyright (c) 2000,2001 Fabrice Bellard
4
 *
5
 * This file is part of FFmpeg.
6
 *
7
 * FFmpeg 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 2.1 of the License, or (at your option) any later version.
11
 *
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 * FFmpeg 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.
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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
20
 */
21
#include "avformat.h"
22
#include "avio.h"
23
#include <stdarg.h>
24

    
25
#define IO_BUFFER_SIZE 32768
26

    
27
static void fill_buffer(ByteIOContext *s);
28

    
29
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,
34
                  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))
37
{
38
    s->buffer = buffer;
39
    s->buffer_size = buffer_size;
40
    s->buf_ptr = buffer;
41
    s->write_flag = write_flag;
42
    if (!s->write_flag)
43
        s->buf_end = buffer;
44
    else
45
        s->buf_end = buffer + buffer_size;
46
    s->opaque = opaque;
47
    s->write_packet = write_packet;
48
    s->read_packet = read_packet;
49
    s->seek = seek;
50
    s->pos = 0;
51
    s->must_flush = 0;
52
    s->eof_reached = 0;
53
    s->error = 0;
54
    s->is_streamed = 0;
55
    s->max_packet_size = 0;
56
    s->update_checksum= NULL;
57
    if(!read_packet && !write_flag){
58
        s->pos = buffer_size;
59
        s->buf_end = s->buffer + buffer_size;
60
    }
61
    return 0;
62
}
63

    
64
static void flush_buffer(ByteIOContext *s)
65
{
66
    if (s->buf_ptr > s->buffer) {
67
        if (s->write_packet && !s->error){
68
            int ret= s->write_packet(s->opaque, s->buffer, s->buf_ptr - s->buffer);
69
            if(ret < 0){
70
                s->error = ret;
71
            }
72
        }
73
        if(s->update_checksum){
74
            s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
75
            s->checksum_ptr= s->buffer;
76
        }
77
        s->pos += s->buf_ptr - s->buffer;
78
    }
79
    s->buf_ptr = s->buffer;
80
}
81

    
82
void put_byte(ByteIOContext *s, int b)
83
{
84
    *(s->buf_ptr)++ = b;
85
    if (s->buf_ptr >= s->buf_end)
86
        flush_buffer(s);
87
}
88

    
89
void put_buffer(ByteIOContext *s, const unsigned char *buf, int size)
90
{
91
    int len;
92

    
93
    while (size > 0) {
94
        len = (s->buf_end - s->buf_ptr);
95
        if (len > size)
96
            len = size;
97
        memcpy(s->buf_ptr, buf, len);
98
        s->buf_ptr += len;
99

    
100
        if (s->buf_ptr >= s->buf_end)
101
            flush_buffer(s);
102

    
103
        buf += len;
104
        size -= len;
105
    }
106
}
107

    
108
void put_flush_packet(ByteIOContext *s)
109
{
110
    flush_buffer(s);
111
    s->must_flush = 0;
112
}
113

    
114
offset_t url_fseek(ByteIOContext *s, offset_t offset, int whence)
115
{
116
    offset_t offset1;
117
    offset_t pos= s->pos - (s->write_flag ? 0 : (s->buf_end - s->buffer));
118

    
119
    if (whence != SEEK_CUR && whence != SEEK_SET)
120
        return AVERROR(EINVAL);
121

    
122
    if (whence == SEEK_CUR) {
123
        offset1 = pos + (s->buf_ptr - s->buffer);
124
        if (offset == 0)
125
            return offset1;
126
        offset += offset1;
127
    }
128
    offset1 = offset - pos;
129
    if (!s->must_flush &&
130
        offset1 >= 0 && offset1 < (s->buf_end - s->buffer)) {
131
        /* can do the seek inside the buffer */
132
        s->buf_ptr = s->buffer + offset1;
133
    } else if(s->is_streamed && !s->write_flag &&
134
              offset1 >= 0 && offset1 < (s->buf_end - s->buffer) + (1<<16)){
135
        while(s->pos < offset && !s->eof_reached)
136
            fill_buffer(s);
137
        s->buf_ptr = s->buf_end + offset - s->pos;
138
    } else {
139
        offset_t res = AVERROR(EPIPE);
140

    
141
#if defined(CONFIG_MUXERS) || defined(CONFIG_NETWORK)
142
        if (s->write_flag) {
143
            flush_buffer(s);
144
            s->must_flush = 1;
145
        } else
146
#endif /* defined(CONFIG_MUXERS) || defined(CONFIG_NETWORK) */
147
        {
148
            s->buf_end = s->buffer;
149
        }
150
        s->buf_ptr = s->buffer;
151
        if (!s->seek || (res = s->seek(s->opaque, offset, SEEK_SET)) < 0)
152
            return res;
153
        s->pos = offset;
154
    }
155
    s->eof_reached = 0;
156
    return offset;
157
}
158

    
159
void url_fskip(ByteIOContext *s, offset_t offset)
160
{
161
    url_fseek(s, offset, SEEK_CUR);
162
}
163

    
164
offset_t url_ftell(ByteIOContext *s)
165
{
166
    return url_fseek(s, 0, SEEK_CUR);
167
}
168

    
169
offset_t url_fsize(ByteIOContext *s)
170
{
171
    offset_t size;
172

    
173
    if (!s->seek)
174
        return AVERROR(EPIPE);
175
    size = s->seek(s->opaque, 0, AVSEEK_SIZE);
176
    if(size<0){
177
        if ((size = s->seek(s->opaque, -1, SEEK_END)) < 0)
178
            return size;
179
        size++;
180
        s->seek(s->opaque, s->pos, SEEK_SET);
181
    }
182
    return size;
183
}
184

    
185
int url_feof(ByteIOContext *s)
186
{
187
    return s->eof_reached;
188
}
189

    
190
int url_ferror(ByteIOContext *s)
191
{
192
    return s->error;
193
}
194

    
195
void put_le32(ByteIOContext *s, unsigned int val)
196
{
197
    put_byte(s, val);
198
    put_byte(s, val >> 8);
199
    put_byte(s, val >> 16);
200
    put_byte(s, val >> 24);
201
}
202

    
203
void put_be32(ByteIOContext *s, unsigned int val)
204
{
205
    put_byte(s, val >> 24);
206
    put_byte(s, val >> 16);
207
    put_byte(s, val >> 8);
208
    put_byte(s, val);
209
}
210

    
211
void put_strz(ByteIOContext *s, const char *str)
212
{
213
    if (str)
214
        put_buffer(s, (const unsigned char *) str, strlen(str) + 1);
215
    else
216
        put_byte(s, 0);
217
}
218

    
219
void put_le64(ByteIOContext *s, uint64_t val)
220
{
221
    put_le32(s, (uint32_t)(val & 0xffffffff));
222
    put_le32(s, (uint32_t)(val >> 32));
223
}
224

    
225
void put_be64(ByteIOContext *s, uint64_t val)
226
{
227
    put_be32(s, (uint32_t)(val >> 32));
228
    put_be32(s, (uint32_t)(val & 0xffffffff));
229
}
230

    
231
void put_le16(ByteIOContext *s, unsigned int val)
232
{
233
    put_byte(s, val);
234
    put_byte(s, val >> 8);
235
}
236

    
237
void put_be16(ByteIOContext *s, unsigned int val)
238
{
239
    put_byte(s, val >> 8);
240
    put_byte(s, val);
241
}
242

    
243
void put_le24(ByteIOContext *s, unsigned int val)
244
{
245
    put_le16(s, val & 0xffff);
246
    put_byte(s, val >> 16);
247
}
248

    
249
void put_be24(ByteIOContext *s, unsigned int val)
250
{
251
    put_be16(s, val >> 8);
252
    put_byte(s, val);
253
}
254

    
255
void put_tag(ByteIOContext *s, const char *tag)
256
{
257
    while (*tag) {
258
        put_byte(s, *tag++);
259
    }
260
}
261

    
262
/* Input stream */
263

    
264
static void fill_buffer(ByteIOContext *s)
265
{
266
    int len;
267

    
268
    /* no need to do anything if EOF already reached */
269
    if (s->eof_reached)
270
        return;
271

    
272
    if(s->update_checksum){
273
        if(s->buf_end > s->checksum_ptr)
274
            s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_end - s->checksum_ptr);
275
        s->checksum_ptr= s->buffer;
276
    }
277

    
278
    len = s->read_packet(s->opaque, s->buffer, s->buffer_size);
279
    if (len <= 0) {
280
        /* do not modify buffer if EOF reached so that a seek back can
281
           be done without rereading data */
282
        s->eof_reached = 1;
283
        if(len<0)
284
            s->error= len;
285
    } else {
286
        s->pos += len;
287
        s->buf_ptr = s->buffer;
288
        s->buf_end = s->buffer + len;
289
    }
290
}
291

    
292
unsigned long get_checksum(ByteIOContext *s){
293
    s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
294
    s->update_checksum= NULL;
295
    return s->checksum;
296
}
297

    
298
void init_checksum(ByteIOContext *s, unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len), unsigned long checksum){
299
    s->update_checksum= update_checksum;
300
    if(s->update_checksum){
301
        s->checksum= checksum;
302
        s->checksum_ptr= s->buf_ptr;
303
    }
304
}
305

    
306
/* XXX: put an inline version */
307
int get_byte(ByteIOContext *s)
308
{
309
    if (s->buf_ptr < s->buf_end) {
310
        return *s->buf_ptr++;
311
    } else {
312
        fill_buffer(s);
313
        if (s->buf_ptr < s->buf_end)
314
            return *s->buf_ptr++;
315
        else
316
            return 0;
317
    }
318
}
319

    
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_le24(ByteIOContext *s)
403
{
404
    unsigned int val;
405
    val = get_le16(s);
406
    val |= get_byte(s) << 16;
407
    return val;
408
}
409

    
410
unsigned int get_le32(ByteIOContext *s)
411
{
412
    unsigned int val;
413
    val = get_le16(s);
414
    val |= get_le16(s) << 16;
415
    return val;
416
}
417

    
418
uint64_t get_le64(ByteIOContext *s)
419
{
420
    uint64_t val;
421
    val = (uint64_t)get_le32(s);
422
    val |= (uint64_t)get_le32(s) << 32;
423
    return val;
424
}
425

    
426
unsigned int get_be16(ByteIOContext *s)
427
{
428
    unsigned int val;
429
    val = get_byte(s) << 8;
430
    val |= get_byte(s);
431
    return val;
432
}
433

    
434
unsigned int get_be24(ByteIOContext *s)
435
{
436
    unsigned int val;
437
    val = get_be16(s) << 8;
438
    val |= get_byte(s);
439
    return val;
440
}
441
unsigned int get_be32(ByteIOContext *s)
442
{
443
    unsigned int val;
444
    val = get_be16(s) << 16;
445
    val |= get_be16(s);
446
    return val;
447
}
448

    
449
char *get_strz(ByteIOContext *s, char *buf, int maxlen)
450
{
451
    int i = 0;
452
    char c;
453

    
454
    while ((c = get_byte(s))) {
455
        if (i < maxlen-1)
456
            buf[i++] = c;
457
    }
458

    
459
    buf[i] = 0; /* Ensure null terminated, but may be truncated */
460

    
461
    return buf;
462
}
463

    
464
uint64_t get_be64(ByteIOContext *s)
465
{
466
    uint64_t val;
467
    val = (uint64_t)get_be32(s) << 32;
468
    val |= (uint64_t)get_be32(s);
469
    return val;
470
}
471

    
472
/* link with avio functions */
473

    
474
#ifdef CONFIG_MUXERS
475
static int url_write_packet(void *opaque, uint8_t *buf, int buf_size)
476
{
477
    URLContext *h = opaque;
478
    return url_write(h, buf, buf_size);
479
}
480
#else
481
#define         url_write_packet NULL
482
#endif //CONFIG_MUXERS
483

    
484
static int url_read_packet(void *opaque, uint8_t *buf, int buf_size)
485
{
486
    URLContext *h = opaque;
487
    return url_read(h, buf, buf_size);
488
}
489

    
490
static offset_t url_seek_packet(void *opaque, offset_t offset, int whence)
491
{
492
    URLContext *h = opaque;
493
    return url_seek(h, offset, whence);
494
    //return 0;
495
}
496

    
497
int url_fdopen(ByteIOContext *s, URLContext *h)
498
{
499
    uint8_t *buffer;
500
    int buffer_size, max_packet_size;
501

    
502

    
503
    max_packet_size = url_get_max_packet_size(h);
504
    if (max_packet_size) {
505
        buffer_size = max_packet_size; /* no need to bufferize more than one packet */
506
    } else {
507
        buffer_size = IO_BUFFER_SIZE;
508
    }
509
    buffer = av_malloc(buffer_size);
510
    if (!buffer)
511
        return AVERROR(ENOMEM);
512

    
513
    if (init_put_byte(s, buffer, buffer_size,
514
                      (h->flags & URL_WRONLY || h->flags & URL_RDWR), h,
515
                      url_read_packet, url_write_packet, url_seek_packet) < 0) {
516
        av_free(buffer);
517
        return AVERROR_IO;
518
    }
519
    s->is_streamed = h->is_streamed;
520
    s->max_packet_size = max_packet_size;
521
    return 0;
522
}
523

    
524
int url_setbufsize(ByteIOContext *s, int buf_size)
525
{
526
    uint8_t *buffer;
527
    buffer = av_malloc(buf_size);
528
    if (!buffer)
529
        return AVERROR(ENOMEM);
530

    
531
    av_free(s->buffer);
532
    s->buffer = buffer;
533
    s->buffer_size = buf_size;
534
    s->buf_ptr = buffer;
535
    if (!s->write_flag)
536
        s->buf_end = buffer;
537
    else
538
        s->buf_end = buffer + buf_size;
539
    return 0;
540
}
541

    
542
int url_fopen(ByteIOContext *s, const char *filename, int flags)
543
{
544
    URLContext *h;
545
    int err;
546

    
547
    err = url_open(&h, filename, flags);
548
    if (err < 0)
549
        return err;
550
    err = url_fdopen(s, h);
551
    if (err < 0) {
552
        url_close(h);
553
        return err;
554
    }
555
    return 0;
556
}
557

    
558
int url_fclose(ByteIOContext *s)
559
{
560
    URLContext *h = s->opaque;
561

    
562
    av_free(s->buffer);
563
    memset(s, 0, sizeof(ByteIOContext));
564
    return url_close(h);
565
}
566

    
567
URLContext *url_fileno(ByteIOContext *s)
568
{
569
    return s->opaque;
570
}
571

    
572
#ifdef CONFIG_MUXERS
573
int url_fprintf(ByteIOContext *s, const char *fmt, ...)
574
{
575
    va_list ap;
576
    char buf[4096];
577
    int ret;
578

    
579
    va_start(ap, fmt);
580
    ret = vsnprintf(buf, sizeof(buf), fmt, ap);
581
    va_end(ap);
582
    put_buffer(s, buf, strlen(buf));
583
    return ret;
584
}
585
#endif //CONFIG_MUXERS
586

    
587
char *url_fgets(ByteIOContext *s, char *buf, int buf_size)
588
{
589
    int c;
590
    char *q;
591

    
592
    c = url_fgetc(s);
593
    if (c == EOF)
594
        return NULL;
595
    q = buf;
596
    for(;;) {
597
        if (c == EOF || c == '\n')
598
            break;
599
        if ((q - buf) < buf_size - 1)
600
            *q++ = c;
601
        c = url_fgetc(s);
602
    }
603
    if (buf_size > 0)
604
        *q = '\0';
605
    return buf;
606
}
607

    
608
int url_fget_max_packet_size(ByteIOContext *s)
609
{
610
    return s->max_packet_size;
611
}
612

    
613
/* url_open_dyn_buf and url_close_dyn_buf are used in rtp.c to send a response
614
 * back to the server even if CONFIG_MUXERS is not set. */
615
#if defined(CONFIG_MUXERS) || defined(CONFIG_NETWORK)
616
/* buffer handling */
617
int url_open_buf(ByteIOContext *s, uint8_t *buf, int buf_size, int flags)
618
{
619
    return init_put_byte(s, buf, buf_size,
620
                         (flags & URL_WRONLY || flags & URL_RDWR),
621
                         NULL, NULL, NULL, NULL);
622
}
623

    
624
int url_close_buf(ByteIOContext *s)
625
{
626
    put_flush_packet(s);
627
    return s->buf_ptr - s->buffer;
628
}
629

    
630
/* output in a dynamic buffer */
631

    
632
typedef struct DynBuffer {
633
    int pos, size, allocated_size;
634
    uint8_t *buffer;
635
    int io_buffer_size;
636
    uint8_t io_buffer[1];
637
} DynBuffer;
638

    
639
static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size)
640
{
641
    DynBuffer *d = opaque;
642
    int new_size, new_allocated_size;
643

    
644
    /* reallocate buffer if needed */
645
    new_size = d->pos + buf_size;
646
    new_allocated_size = d->allocated_size;
647
    if(new_size < d->pos || new_size > INT_MAX/2)
648
        return -1;
649
    while (new_size > new_allocated_size) {
650
        if (!new_allocated_size)
651
            new_allocated_size = new_size;
652
        else
653
            new_allocated_size += new_allocated_size / 2 + 1;
654
    }
655

    
656
    if (new_allocated_size > d->allocated_size) {
657
        d->buffer = av_realloc(d->buffer, new_allocated_size);
658
        if(d->buffer == NULL)
659
             return -1234;
660
        d->allocated_size = new_allocated_size;
661
    }
662
    memcpy(d->buffer + d->pos, buf, buf_size);
663
    d->pos = new_size;
664
    if (d->pos > d->size)
665
        d->size = d->pos;
666
    return buf_size;
667
}
668

    
669
static int dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size)
670
{
671
    unsigned char buf1[4];
672
    int ret;
673

    
674
    /* packetized write: output the header */
675
    buf1[0] = (buf_size >> 24);
676
    buf1[1] = (buf_size >> 16);
677
    buf1[2] = (buf_size >> 8);
678
    buf1[3] = (buf_size);
679
    ret= dyn_buf_write(opaque, buf1, 4);
680
    if(ret < 0)
681
        return ret;
682

    
683
    /* then the data */
684
    return dyn_buf_write(opaque, buf, buf_size);
685
}
686

    
687
static offset_t dyn_buf_seek(void *opaque, offset_t offset, int whence)
688
{
689
    DynBuffer *d = opaque;
690

    
691
    if (whence == SEEK_CUR)
692
        offset += d->pos;
693
    else if (whence == SEEK_END)
694
        offset += d->size;
695
    if (offset < 0 || offset > 0x7fffffffLL)
696
        return -1;
697
    d->pos = offset;
698
    return 0;
699
}
700

    
701
static int url_open_dyn_buf_internal(ByteIOContext *s, int max_packet_size)
702
{
703
    DynBuffer *d;
704
    int io_buffer_size, ret;
705

    
706
    if (max_packet_size)
707
        io_buffer_size = max_packet_size;
708
    else
709
        io_buffer_size = 1024;
710

    
711
    if(sizeof(DynBuffer) + io_buffer_size < io_buffer_size)
712
        return -1;
713
    d = av_malloc(sizeof(DynBuffer) + io_buffer_size);
714
    if (!d)
715
        return -1;
716
    d->io_buffer_size = io_buffer_size;
717
    d->buffer = NULL;
718
    d->pos = 0;
719
    d->size = 0;
720
    d->allocated_size = 0;
721
    ret = init_put_byte(s, d->io_buffer, io_buffer_size,
722
                        1, d, NULL,
723
                        max_packet_size ? dyn_packet_buf_write : dyn_buf_write,
724
                        max_packet_size ? NULL : dyn_buf_seek);
725
    if (ret == 0) {
726
        s->max_packet_size = max_packet_size;
727
    }
728
    return ret;
729
}
730

    
731
int url_open_dyn_buf(ByteIOContext *s)
732
{
733
    return url_open_dyn_buf_internal(s, 0);
734
}
735

    
736
int url_open_dyn_packet_buf(ByteIOContext *s, int max_packet_size)
737
{
738
    if (max_packet_size <= 0)
739
        return -1;
740
    return url_open_dyn_buf_internal(s, max_packet_size);
741
}
742

    
743
int url_close_dyn_buf(ByteIOContext *s, uint8_t **pbuffer)
744
{
745
    DynBuffer *d = s->opaque;
746
    int size;
747

    
748
    put_flush_packet(s);
749

    
750
    *pbuffer = d->buffer;
751
    size = d->size;
752
    av_free(d);
753
    return size;
754
}
755
#endif /* CONFIG_MUXERS || CONFIG_NETWORK */