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[libav.git] / libavformat / aviobuf.c
CommitLineData
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1/*
2 * Buffered I/O for ffmpeg system
19720f15 3 * Copyright (c) 2000,2001 Fabrice Bellard
de6d9b64 4 *
19720f15
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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.
de6d9b64 9 *
19720f15 10 * This library is distributed in the hope that it will be useful,
de6d9b64 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19720f15
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12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
de6d9b64 14 *
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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
de6d9b64 18 */
de6d9b64 19#include "avformat.h"
5c91a675 20#include "avio.h"
abba3dd1 21#include <stdarg.h>
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22
23#define IO_BUFFER_SIZE 32768
24
25int init_put_byte(ByteIOContext *s,
26 unsigned char *buffer,
27 int buffer_size,
28 int write_flag,
29 void *opaque,
0c1a9eda 30 int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
576ae256 31 int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
536ffa59 32 offset_t (*seek)(void *opaque, offset_t offset, int whence))
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33{
34 s->buffer = buffer;
35 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;
42 s->opaque = opaque;
43 s->write_packet = write_packet;
44 s->read_packet = read_packet;
45 s->seek = seek;
46 s->pos = 0;
47 s->must_flush = 0;
48 s->eof_reached = 0;
576ae256 49 s->error = 0;
de6d9b64 50 s->is_streamed = 0;
abba3dd1 51 s->max_packet_size = 0;
ee9f36a8 52 s->update_checksum= NULL;
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53 return 0;
54}
55
56
764ef400 57#ifdef CONFIG_ENCODERS
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58static void flush_buffer(ByteIOContext *s)
59{
60 if (s->buf_ptr > s->buffer) {
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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 }
465e1dad 67 if(s->update_checksum){
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68 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
69 s->checksum_ptr= s->buffer;
70 }
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71 s->pos += s->buf_ptr - s->buffer;
72 }
73 s->buf_ptr = s->buffer;
74}
75
76void 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
75bdb984 83void put_buffer(ByteIOContext *s, const unsigned char *buf, int size)
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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
102void put_flush_packet(ByteIOContext *s)
103{
104 flush_buffer(s);
105 s->must_flush = 0;
106}
764ef400 107#endif //CONFIG_ENCODERS
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108
109offset_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
764ef400 116#ifdef CONFIG_ENCODERS
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117 if (s->write_flag) {
118 if (whence == SEEK_CUR) {
4606ac8d 119 offset1 = s->pos + (s->buf_ptr - s->buffer);
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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 }
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138 } else
139#endif //CONFIG_ENCODERS
140 {
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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;
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156 if (s->seek(s->opaque, offset, SEEK_SET) == (offset_t)-EPIPE)
157 return -EPIPE;
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158 s->pos = offset;
159 }
abba3dd1 160 s->eof_reached = 0;
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161 }
162 return offset;
163}
164
165void url_fskip(ByteIOContext *s, offset_t offset)
166{
167 url_fseek(s, offset, SEEK_CUR);
168}
169
170offset_t url_ftell(ByteIOContext *s)
171{
172 return url_fseek(s, 0, SEEK_CUR);
173}
174
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175offset_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
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186int url_feof(ByteIOContext *s)
187{
188 return s->eof_reached;
189}
190
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191int url_ferror(ByteIOContext *s)
192{
193 return s->error;
194}
195
764ef400 196#ifdef CONFIG_ENCODERS
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197void 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
205void 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
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213/* IEEE format is assumed */
214void put_be64_double(ByteIOContext *s, double val)
215{
216 union {
217 double d;
0c1a9eda 218 uint64_t ull;
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219 } u;
220 u.d = val;
221 put_be64(s, u.ull);
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222}
223
3b4b29dc 224void put_strz(ByteIOContext *s, const char *str)
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225{
226 if (str)
227 put_buffer(s, (const unsigned char *) str, strlen(str) + 1);
228 else
229 put_byte(s, 0);
230}
231
0c1a9eda 232void put_le64(ByteIOContext *s, uint64_t val)
de6d9b64 233{
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234 put_le32(s, (uint32_t)(val & 0xffffffff));
235 put_le32(s, (uint32_t)(val >> 32));
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236}
237
0c1a9eda 238void put_be64(ByteIOContext *s, uint64_t val)
de6d9b64 239{
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240 put_be32(s, (uint32_t)(val >> 32));
241 put_be32(s, (uint32_t)(val & 0xffffffff));
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242}
243
244void put_le16(ByteIOContext *s, unsigned int val)
245{
246 put_byte(s, val);
247 put_byte(s, val >> 8);
248}
249
250void put_be16(ByteIOContext *s, unsigned int val)
251{
252 put_byte(s, val >> 8);
253 put_byte(s, val);
254}
255
0570bf06 256void put_tag(ByteIOContext *s, const char *tag)
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257{
258 while (*tag) {
259 put_byte(s, *tag++);
260 }
261}
764ef400 262#endif //CONFIG_ENCODERS
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263
264/* Input stream */
265
266static void fill_buffer(ByteIOContext *s)
267{
268 int len;
269
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270 /* no need to do anything if EOF already reached */
271 if (s->eof_reached)
272 return;
ee9f36a8 273
465e1dad 274 if(s->update_checksum){
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275 if(s->buf_end > s->checksum_ptr)
276 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_end - s->checksum_ptr);
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277 s->checksum_ptr= s->buffer;
278 }
279
de6d9b64 280 len = s->read_packet(s->opaque, s->buffer, s->buffer_size);
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281 if (len <= 0) {
282 /* do not modify buffer if EOF reached so that a seek back can
283 be done without rereading data */
de6d9b64 284 s->eof_reached = 1;
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285 if(len<0)
286 s->error= len;
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287 } else {
288 s->pos += len;
289 s->buf_ptr = s->buffer;
290 s->buf_end = s->buffer + len;
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291 }
292}
293
ee9f36a8
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294unsigned long get_checksum(ByteIOContext *s){
295 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
465e1dad 296 s->update_checksum= NULL;
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297 return s->checksum;
298}
299
300void init_checksum(ByteIOContext *s, unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len), unsigned long checksum){
301 s->update_checksum= update_checksum;
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302 if(s->update_checksum){
303 s->checksum= s->update_checksum(checksum, NULL, 0);
304 s->checksum_ptr= s->buf_ptr;
305 }
ee9f36a8
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306}
307
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308/* NOTE: return 0 if EOF, so you cannot use it if EOF handling is
309 necessary */
310/* XXX: put an inline version */
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311int get_byte(ByteIOContext *s)
312{
313 if (s->buf_ptr < s->buf_end) {
314 return *s->buf_ptr++;
315 } else {
316 fill_buffer(s);
317 if (s->buf_ptr < s->buf_end)
318 return *s->buf_ptr++;
319 else
320 return 0;
321 }
322}
323
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324/* NOTE: return URL_EOF (-1) if EOF */
325int url_fgetc(ByteIOContext *s)
326{
327 if (s->buf_ptr < s->buf_end) {
328 return *s->buf_ptr++;
329 } else {
330 fill_buffer(s);
331 if (s->buf_ptr < s->buf_end)
332 return *s->buf_ptr++;
333 else
334 return URL_EOF;
335 }
336}
337
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338int get_buffer(ByteIOContext *s, unsigned char *buf, int size)
339{
340 int len, size1;
341
342 size1 = size;
343 while (size > 0) {
344 len = s->buf_end - s->buf_ptr;
345 if (len > size)
346 len = size;
347 if (len == 0) {
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348 if(size > s->buffer_size && !s->update_checksum){
349 len = s->read_packet(s->opaque, buf, size);
350 if (len <= 0) {
351 /* do not modify buffer if EOF reached so that a seek back can
352 be done without rereading data */
353 s->eof_reached = 1;
354 if(len<0)
355 s->error= len;
356 break;
357 } else {
358 s->pos += len;
359 size -= len;
360 buf += len;
361 s->buf_ptr = s->buffer;
362 s->buf_end = s->buffer/* + len*/;
363 }
364 }else{
365 fill_buffer(s);
366 len = s->buf_end - s->buf_ptr;
367 if (len == 0)
368 break;
369 }
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370 } else {
371 memcpy(buf, s->buf_ptr, len);
372 buf += len;
373 s->buf_ptr += len;
374 size -= len;
375 }
376 }
377 return size1 - size;
378}
379
e15dec10
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380int get_partial_buffer(ByteIOContext *s, unsigned char *buf, int size)
381{
382 int len;
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383
384 if(size<0)
385 return -1;
e15dec10
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386
387 len = s->buf_end - s->buf_ptr;
388 if (len == 0) {
389 fill_buffer(s);
390 len = s->buf_end - s->buf_ptr;
391 }
392 if (len > size)
393 len = size;
394 memcpy(buf, s->buf_ptr, len);
395 s->buf_ptr += len;
396 return len;
397}
398
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399unsigned int get_le16(ByteIOContext *s)
400{
401 unsigned int val;
402 val = get_byte(s);
403 val |= get_byte(s) << 8;
404 return val;
405}
406
407unsigned int get_le32(ByteIOContext *s)
408{
409 unsigned int val;
410 val = get_byte(s);
411 val |= get_byte(s) << 8;
412 val |= get_byte(s) << 16;
413 val |= get_byte(s) << 24;
414 return val;
415}
416
0c1a9eda 417uint64_t get_le64(ByteIOContext *s)
de6d9b64 418{
0c1a9eda
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419 uint64_t val;
420 val = (uint64_t)get_le32(s);
421 val |= (uint64_t)get_le32(s) << 32;
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422 return val;
423}
424
425unsigned int get_be16(ByteIOContext *s)
426{
427 unsigned int val;
428 val = get_byte(s) << 8;
429 val |= get_byte(s);
430 return val;
431}
432
433unsigned int get_be32(ByteIOContext *s)
434{
435 unsigned int val;
436 val = get_byte(s) << 24;
437 val |= get_byte(s) << 16;
438 val |= get_byte(s) << 8;
439 val |= get_byte(s);
440 return val;
441}
442
3b4b29dc 443double get_be64_double(ByteIOContext *s)
75bdb984 444{
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445 union {
446 double d;
0c1a9eda 447 uint64_t ull;
3b4b29dc 448 } u;
75bdb984 449
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450 u.ull = get_be64(s);
451 return u.d;
75bdb984
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452}
453
3b4b29dc 454char *get_strz(ByteIOContext *s, char *buf, int maxlen)
75bdb984
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455{
456 int i = 0;
457 char c;
458
459 while ((c = get_byte(s))) {
460 if (i < maxlen-1)
461 buf[i++] = c;
462 }
463
464 buf[i] = 0; /* Ensure null terminated, but may be truncated */
465
466 return buf;
467}
468
0c1a9eda 469uint64_t get_be64(ByteIOContext *s)
de6d9b64 470{
0c1a9eda
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471 uint64_t val;
472 val = (uint64_t)get_be32(s) << 32;
473 val |= (uint64_t)get_be32(s);
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474 return val;
475}
476
477/* link with avio functions */
478
764ef400 479#ifdef CONFIG_ENCODERS
576ae256 480static int url_write_packet(void *opaque, uint8_t *buf, int buf_size)
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481{
482 URLContext *h = opaque;
576ae256 483 return url_write(h, buf, buf_size);
de6d9b64 484}
764ef400
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485#else
486#define url_write_packet NULL
487#endif //CONFIG_ENCODERS
de6d9b64 488
0c1a9eda 489static int url_read_packet(void *opaque, uint8_t *buf, int buf_size)
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490{
491 URLContext *h = opaque;
492 return url_read(h, buf, buf_size);
493}
494
536ffa59 495static offset_t url_seek_packet(void *opaque, offset_t offset, int whence)
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496{
497 URLContext *h = opaque;
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498 return url_seek(h, offset, whence);
499 //return 0;
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500}
501
502int url_fdopen(ByteIOContext *s, URLContext *h)
503{
0c1a9eda 504 uint8_t *buffer;
abba3dd1 505 int buffer_size, max_packet_size;
de6d9b64 506
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507
508 max_packet_size = url_get_max_packet_size(h);
509 if (max_packet_size) {
510 buffer_size = max_packet_size; /* no need to bufferize more than one packet */
511 } else {
512 buffer_size = IO_BUFFER_SIZE;
513 }
1ea4f593 514 buffer = av_malloc(buffer_size);
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515 if (!buffer)
516 return -ENOMEM;
517
518 if (init_put_byte(s, buffer, buffer_size,
ac9fe33d 519 (h->flags & URL_WRONLY || h->flags & URL_RDWR), h,
de6d9b64 520 url_read_packet, url_write_packet, url_seek_packet) < 0) {
1ea4f593 521 av_free(buffer);
0bd586c5 522 return AVERROR_IO;
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523 }
524 s->is_streamed = h->is_streamed;
abba3dd1 525 s->max_packet_size = max_packet_size;
de6d9b64
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526 return 0;
527}
528
529/* XXX: must be called before any I/O */
530int url_setbufsize(ByteIOContext *s, int buf_size)
531{
0c1a9eda 532 uint8_t *buffer;
1ea4f593 533 buffer = av_malloc(buf_size);
de6d9b64
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534 if (!buffer)
535 return -ENOMEM;
536
1ea4f593 537 av_free(s->buffer);
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538 s->buffer = buffer;
539 s->buffer_size = buf_size;
540 s->buf_ptr = buffer;
541 if (!s->write_flag)
542 s->buf_end = buffer;
543 else
544 s->buf_end = buffer + buf_size;
545 return 0;
546}
547
abba3dd1
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548/* NOTE: when opened as read/write, the buffers are only used for
549 reading */
de6d9b64
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550int url_fopen(ByteIOContext *s, const char *filename, int flags)
551{
552 URLContext *h;
553 int err;
554
555 err = url_open(&h, filename, flags);
556 if (err < 0)
557 return err;
558 err = url_fdopen(s, h);
559 if (err < 0) {
560 url_close(h);
561 return err;
562 }
563 return 0;
564}
565
566int url_fclose(ByteIOContext *s)
567{
568 URLContext *h = s->opaque;
569
1ea4f593 570 av_free(s->buffer);
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571 memset(s, 0, sizeof(ByteIOContext));
572 return url_close(h);
573}
574
575URLContext *url_fileno(ByteIOContext *s)
576{
577 return s->opaque;
578}
579
764ef400 580#ifdef CONFIG_ENCODERS
abba3dd1
FB
581/* XXX: currently size is limited */
582int url_fprintf(ByteIOContext *s, const char *fmt, ...)
583{
584 va_list ap;
585 char buf[4096];
586 int ret;
587
588 va_start(ap, fmt);
589 ret = vsnprintf(buf, sizeof(buf), fmt, ap);
590 va_end(ap);
591 put_buffer(s, buf, strlen(buf));
592 return ret;
593}
764ef400 594#endif //CONFIG_ENCODERS
abba3dd1
FB
595
596/* note: unlike fgets, the EOL character is not returned and a whole
597 line is parsed. return NULL if first char read was EOF */
598char *url_fgets(ByteIOContext *s, char *buf, int buf_size)
599{
600 int c;
601 char *q;
602
603 c = url_fgetc(s);
604 if (c == EOF)
605 return NULL;
606 q = buf;
607 for(;;) {
608 if (c == EOF || c == '\n')
609 break;
610 if ((q - buf) < buf_size - 1)
611 *q++ = c;
612 c = url_fgetc(s);
613 }
614 if (buf_size > 0)
615 *q = '\0';
616 return buf;
617}
618
619/*
620 * Return the maximum packet size associated to packetized buffered file
621 * handle. If the file is not packetized (stream like http or file on
622 * disk), then 0 is returned.
623 *
624 * @param h buffered file handle
625 * @return maximum packet size in bytes
626 */
627int url_fget_max_packet_size(ByteIOContext *s)
628{
629 return s->max_packet_size;
630}
631
764ef400 632#ifdef CONFIG_ENCODERS
de6d9b64 633/* buffer handling */
0c1a9eda 634int url_open_buf(ByteIOContext *s, uint8_t *buf, int buf_size, int flags)
de6d9b64
FB
635{
636 return init_put_byte(s, buf, buf_size,
ac9fe33d
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637 (flags & URL_WRONLY || flags & URL_RDWR),
638 NULL, NULL, NULL, NULL);
de6d9b64
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639}
640
641/* return the written or read size */
642int url_close_buf(ByteIOContext *s)
643{
abba3dd1 644 put_flush_packet(s);
de6d9b64
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645 return s->buf_ptr - s->buffer;
646}
abba3dd1
FB
647
648/* output in a dynamic buffer */
649
650typedef struct DynBuffer {
651 int pos, size, allocated_size;
0c1a9eda 652 uint8_t *buffer;
abba3dd1 653 int io_buffer_size;
0c1a9eda 654 uint8_t io_buffer[1];
abba3dd1
FB
655} DynBuffer;
656
576ae256 657static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size)
abba3dd1
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658{
659 DynBuffer *d = opaque;
660 int new_size, new_allocated_size;
abba3dd1
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661
662 /* reallocate buffer if needed */
663 new_size = d->pos + buf_size;
664 new_allocated_size = d->allocated_size;
568e18b1
MN
665 if(new_size < d->pos || new_size > INT_MAX/2)
666 return -1;
abba3dd1
FB
667 while (new_size > new_allocated_size) {
668 if (!new_allocated_size)
669 new_allocated_size = new_size;
670 else
568e18b1 671 new_allocated_size += new_allocated_size / 2 + 1;
abba3dd1
FB
672 }
673
674 if (new_allocated_size > d->allocated_size) {
b88ba823
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675 d->buffer = av_realloc(d->buffer, new_allocated_size);
676 if(d->buffer == NULL)
576ae256 677 return -1234;
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678 d->allocated_size = new_allocated_size;
679 }
680 memcpy(d->buffer + d->pos, buf, buf_size);
681 d->pos = new_size;
682 if (d->pos > d->size)
683 d->size = d->pos;
576ae256 684 return buf_size;
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685}
686
576ae256 687static int dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size)
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688{
689 unsigned char buf1[4];
576ae256 690 int ret;
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691
692 /* packetized write: output the header */
693 buf1[0] = (buf_size >> 24);
694 buf1[1] = (buf_size >> 16);
695 buf1[2] = (buf_size >> 8);
696 buf1[3] = (buf_size);
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697 ret= dyn_buf_write(opaque, buf1, 4);
698 if(ret < 0)
699 return ret;
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700
701 /* then the data */
576ae256 702 return dyn_buf_write(opaque, buf, buf_size);
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703}
704
536ffa59 705static offset_t dyn_buf_seek(void *opaque, offset_t offset, int whence)
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706{
707 DynBuffer *d = opaque;
708
709 if (whence == SEEK_CUR)
710 offset += d->pos;
711 else if (whence == SEEK_END)
712 offset += d->size;
713 if (offset < 0 || offset > 0x7fffffffLL)
714 return -1;
715 d->pos = offset;
716 return 0;
717}
718
719static int url_open_dyn_buf_internal(ByteIOContext *s, int max_packet_size)
720{
721 DynBuffer *d;
722 int io_buffer_size, ret;
723
724 if (max_packet_size)
725 io_buffer_size = max_packet_size;
726 else
727 io_buffer_size = 1024;
728
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729 if(sizeof(DynBuffer) + io_buffer_size < io_buffer_size)
730 return -1;
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731 d = av_malloc(sizeof(DynBuffer) + io_buffer_size);
732 if (!d)
733 return -1;
734 d->io_buffer_size = io_buffer_size;
735 d->buffer = NULL;
736 d->pos = 0;
737 d->size = 0;
738 d->allocated_size = 0;
739 ret = init_put_byte(s, d->io_buffer, io_buffer_size,
740 1, d, NULL,
741 max_packet_size ? dyn_packet_buf_write : dyn_buf_write,
742 max_packet_size ? NULL : dyn_buf_seek);
743 if (ret == 0) {
744 s->max_packet_size = max_packet_size;
745 }
746 return ret;
747}
748
749/*
750 * Open a write only memory stream.
751 *
752 * @param s new IO context
753 * @return zero if no error.
754 */
755int url_open_dyn_buf(ByteIOContext *s)
756{
757 return url_open_dyn_buf_internal(s, 0);
758}
759
760/*
761 * Open a write only packetized memory stream with a maximum packet
762 * size of 'max_packet_size'. The stream is stored in a memory buffer
763 * with a big endian 4 byte header giving the packet size in bytes.
764 *
765 * @param s new IO context
766 * @param max_packet_size maximum packet size (must be > 0)
767 * @return zero if no error.
768 */
769int url_open_dyn_packet_buf(ByteIOContext *s, int max_packet_size)
770{
771 if (max_packet_size <= 0)
772 return -1;
773 return url_open_dyn_buf_internal(s, max_packet_size);
774}
775
776/*
777 * Return the written size and a pointer to the buffer. The buffer
778 * must be freed with av_free().
779 * @param s IO context
780 * @param pointer to a byte buffer
781 * @return the length of the byte buffer
782 */
0c1a9eda 783int url_close_dyn_buf(ByteIOContext *s, uint8_t **pbuffer)
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784{
785 DynBuffer *d = s->opaque;
786 int size;
787
788 put_flush_packet(s);
789
790 *pbuffer = d->buffer;
791 size = d->size;
792 av_free(d);
793 return size;
794}
764ef400 795#endif //CONFIG_ENCODERS