drop most url_fileno() calls (allows to use ByteIOContext directly in caller apps...
[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 *
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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),
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32 int (*seek)(void *opaque, offset_t offset, int whence))
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) {
576ae256
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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 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_end - s->checksum_ptr);
276 s->checksum_ptr= s->buffer;
277 }
278
de6d9b64 279 len = s->read_packet(s->opaque, s->buffer, s->buffer_size);
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280 if (len <= 0) {
281 /* do not modify buffer if EOF reached so that a seek back can
282 be done without rereading data */
de6d9b64 283 s->eof_reached = 1;
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284 if(len<0)
285 s->error= len;
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286 } else {
287 s->pos += len;
288 s->buf_ptr = s->buffer;
289 s->buf_end = s->buffer + len;
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290 }
291}
292
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293unsigned long get_checksum(ByteIOContext *s){
294 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
465e1dad 295 s->update_checksum= NULL;
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296 return s->checksum;
297}
298
299void init_checksum(ByteIOContext *s, unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len), unsigned long checksum){
300 s->update_checksum= update_checksum;
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301 if(s->update_checksum){
302 s->checksum= s->update_checksum(checksum, NULL, 0);
303 s->checksum_ptr= s->buf_ptr;
304 }
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305}
306
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307/* NOTE: return 0 if EOF, so you cannot use it if EOF handling is
308 necessary */
309/* XXX: put an inline version */
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310int get_byte(ByteIOContext *s)
311{
312 if (s->buf_ptr < s->buf_end) {
313 return *s->buf_ptr++;
314 } else {
315 fill_buffer(s);
316 if (s->buf_ptr < s->buf_end)
317 return *s->buf_ptr++;
318 else
319 return 0;
320 }
321}
322
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323/* NOTE: return URL_EOF (-1) if EOF */
324int url_fgetc(ByteIOContext *s)
325{
326 if (s->buf_ptr < s->buf_end) {
327 return *s->buf_ptr++;
328 } else {
329 fill_buffer(s);
330 if (s->buf_ptr < s->buf_end)
331 return *s->buf_ptr++;
332 else
333 return URL_EOF;
334 }
335}
336
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337int get_buffer(ByteIOContext *s, unsigned char *buf, int size)
338{
339 int len, size1;
340
341 size1 = size;
342 while (size > 0) {
343 len = s->buf_end - s->buf_ptr;
344 if (len > size)
345 len = size;
346 if (len == 0) {
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MN
347 if(size > s->buffer_size && !s->update_checksum){
348 len = s->read_packet(s->opaque, buf, size);
349 if (len <= 0) {
350 /* do not modify buffer if EOF reached so that a seek back can
351 be done without rereading data */
352 s->eof_reached = 1;
353 if(len<0)
354 s->error= len;
355 break;
356 } else {
357 s->pos += len;
358 size -= len;
359 buf += len;
360 s->buf_ptr = s->buffer;
361 s->buf_end = s->buffer/* + len*/;
362 }
363 }else{
364 fill_buffer(s);
365 len = s->buf_end - s->buf_ptr;
366 if (len == 0)
367 break;
368 }
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369 } else {
370 memcpy(buf, s->buf_ptr, len);
371 buf += len;
372 s->buf_ptr += len;
373 size -= len;
374 }
375 }
376 return size1 - size;
377}
378
e15dec10
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379int get_partial_buffer(ByteIOContext *s, unsigned char *buf, int size)
380{
381 int len;
0ecca7a4
MN
382
383 if(size<0)
384 return -1;
e15dec10
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385
386 len = s->buf_end - s->buf_ptr;
387 if (len == 0) {
388 fill_buffer(s);
389 len = s->buf_end - s->buf_ptr;
390 }
391 if (len > size)
392 len = size;
393 memcpy(buf, s->buf_ptr, len);
394 s->buf_ptr += len;
395 return len;
396}
397
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398unsigned int get_le16(ByteIOContext *s)
399{
400 unsigned int val;
401 val = get_byte(s);
402 val |= get_byte(s) << 8;
403 return val;
404}
405
406unsigned int get_le32(ByteIOContext *s)
407{
408 unsigned int val;
409 val = get_byte(s);
410 val |= get_byte(s) << 8;
411 val |= get_byte(s) << 16;
412 val |= get_byte(s) << 24;
413 return val;
414}
415
0c1a9eda 416uint64_t get_le64(ByteIOContext *s)
de6d9b64 417{
0c1a9eda
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418 uint64_t val;
419 val = (uint64_t)get_le32(s);
420 val |= (uint64_t)get_le32(s) << 32;
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421 return val;
422}
423
424unsigned int get_be16(ByteIOContext *s)
425{
426 unsigned int val;
427 val = get_byte(s) << 8;
428 val |= get_byte(s);
429 return val;
430}
431
432unsigned int get_be32(ByteIOContext *s)
433{
434 unsigned int val;
435 val = get_byte(s) << 24;
436 val |= get_byte(s) << 16;
437 val |= get_byte(s) << 8;
438 val |= get_byte(s);
439 return val;
440}
441
3b4b29dc 442double get_be64_double(ByteIOContext *s)
75bdb984 443{
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444 union {
445 double d;
0c1a9eda 446 uint64_t ull;
3b4b29dc 447 } u;
75bdb984 448
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449 u.ull = get_be64(s);
450 return u.d;
75bdb984
PG
451}
452
3b4b29dc 453char *get_strz(ByteIOContext *s, char *buf, int maxlen)
75bdb984
PG
454{
455 int i = 0;
456 char c;
457
458 while ((c = get_byte(s))) {
459 if (i < maxlen-1)
460 buf[i++] = c;
461 }
462
463 buf[i] = 0; /* Ensure null terminated, but may be truncated */
464
465 return buf;
466}
467
0c1a9eda 468uint64_t get_be64(ByteIOContext *s)
de6d9b64 469{
0c1a9eda
ZK
470 uint64_t val;
471 val = (uint64_t)get_be32(s) << 32;
472 val |= (uint64_t)get_be32(s);
de6d9b64
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473 return val;
474}
475
476/* link with avio functions */
477
764ef400 478#ifdef CONFIG_ENCODERS
576ae256 479static int url_write_packet(void *opaque, uint8_t *buf, int buf_size)
de6d9b64
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480{
481 URLContext *h = opaque;
576ae256 482 return url_write(h, buf, buf_size);
de6d9b64 483}
764ef400
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484#else
485#define url_write_packet NULL
486#endif //CONFIG_ENCODERS
de6d9b64 487
0c1a9eda 488static int url_read_packet(void *opaque, uint8_t *buf, int buf_size)
de6d9b64
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489{
490 URLContext *h = opaque;
491 return url_read(h, buf, buf_size);
492}
493
0c1a9eda 494static int url_seek_packet(void *opaque, int64_t offset, int whence)
de6d9b64
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495{
496 URLContext *h = opaque;
53e2f9ca
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497 return url_seek(h, offset, whence);
498 //return 0;
de6d9b64
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499}
500
501int url_fdopen(ByteIOContext *s, URLContext *h)
502{
0c1a9eda 503 uint8_t *buffer;
abba3dd1 504 int buffer_size, max_packet_size;
de6d9b64 505
abba3dd1
FB
506
507 max_packet_size = url_get_max_packet_size(h);
508 if (max_packet_size) {
509 buffer_size = max_packet_size; /* no need to bufferize more than one packet */
510 } else {
511 buffer_size = IO_BUFFER_SIZE;
512 }
1ea4f593 513 buffer = av_malloc(buffer_size);
de6d9b64
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514 if (!buffer)
515 return -ENOMEM;
516
517 if (init_put_byte(s, buffer, buffer_size,
ac9fe33d 518 (h->flags & URL_WRONLY || h->flags & URL_RDWR), h,
de6d9b64 519 url_read_packet, url_write_packet, url_seek_packet) < 0) {
1ea4f593 520 av_free(buffer);
0bd586c5 521 return AVERROR_IO;
de6d9b64
FB
522 }
523 s->is_streamed = h->is_streamed;
abba3dd1 524 s->max_packet_size = max_packet_size;
de6d9b64
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525 return 0;
526}
527
528/* XXX: must be called before any I/O */
529int url_setbufsize(ByteIOContext *s, int buf_size)
530{
0c1a9eda 531 uint8_t *buffer;
1ea4f593 532 buffer = av_malloc(buf_size);
de6d9b64
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533 if (!buffer)
534 return -ENOMEM;
535
1ea4f593 536 av_free(s->buffer);
de6d9b64
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537 s->buffer = buffer;
538 s->buffer_size = buf_size;
539 s->buf_ptr = buffer;
540 if (!s->write_flag)
541 s->buf_end = buffer;
542 else
543 s->buf_end = buffer + buf_size;
544 return 0;
545}
546
abba3dd1
FB
547/* NOTE: when opened as read/write, the buffers are only used for
548 reading */
de6d9b64
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549int url_fopen(ByteIOContext *s, const char *filename, int flags)
550{
551 URLContext *h;
552 int err;
553
554 err = url_open(&h, filename, flags);
555 if (err < 0)
556 return err;
557 err = url_fdopen(s, h);
558 if (err < 0) {
559 url_close(h);
560 return err;
561 }
562 return 0;
563}
564
565int url_fclose(ByteIOContext *s)
566{
567 URLContext *h = s->opaque;
568
1ea4f593 569 av_free(s->buffer);
de6d9b64
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570 memset(s, 0, sizeof(ByteIOContext));
571 return url_close(h);
572}
573
574URLContext *url_fileno(ByteIOContext *s)
575{
576 return s->opaque;
577}
578
764ef400 579#ifdef CONFIG_ENCODERS
abba3dd1
FB
580/* XXX: currently size is limited */
581int url_fprintf(ByteIOContext *s, const char *fmt, ...)
582{
583 va_list ap;
584 char buf[4096];
585 int ret;
586
587 va_start(ap, fmt);
588 ret = vsnprintf(buf, sizeof(buf), fmt, ap);
589 va_end(ap);
590 put_buffer(s, buf, strlen(buf));
591 return ret;
592}
764ef400 593#endif //CONFIG_ENCODERS
abba3dd1
FB
594
595/* note: unlike fgets, the EOL character is not returned and a whole
596 line is parsed. return NULL if first char read was EOF */
597char *url_fgets(ByteIOContext *s, char *buf, int buf_size)
598{
599 int c;
600 char *q;
601
602 c = url_fgetc(s);
603 if (c == EOF)
604 return NULL;
605 q = buf;
606 for(;;) {
607 if (c == EOF || c == '\n')
608 break;
609 if ((q - buf) < buf_size - 1)
610 *q++ = c;
611 c = url_fgetc(s);
612 }
613 if (buf_size > 0)
614 *q = '\0';
615 return buf;
616}
617
618/*
619 * Return the maximum packet size associated to packetized buffered file
620 * handle. If the file is not packetized (stream like http or file on
621 * disk), then 0 is returned.
622 *
623 * @param h buffered file handle
624 * @return maximum packet size in bytes
625 */
626int url_fget_max_packet_size(ByteIOContext *s)
627{
628 return s->max_packet_size;
629}
630
764ef400 631#ifdef CONFIG_ENCODERS
de6d9b64 632/* buffer handling */
0c1a9eda 633int url_open_buf(ByteIOContext *s, uint8_t *buf, int buf_size, int flags)
de6d9b64
FB
634{
635 return init_put_byte(s, buf, buf_size,
ac9fe33d
GB
636 (flags & URL_WRONLY || flags & URL_RDWR),
637 NULL, NULL, NULL, NULL);
de6d9b64
FB
638}
639
640/* return the written or read size */
641int url_close_buf(ByteIOContext *s)
642{
abba3dd1 643 put_flush_packet(s);
de6d9b64
FB
644 return s->buf_ptr - s->buffer;
645}
abba3dd1
FB
646
647/* output in a dynamic buffer */
648
649typedef struct DynBuffer {
650 int pos, size, allocated_size;
0c1a9eda 651 uint8_t *buffer;
abba3dd1 652 int io_buffer_size;
0c1a9eda 653 uint8_t io_buffer[1];
abba3dd1
FB
654} DynBuffer;
655
576ae256 656static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size)
abba3dd1
FB
657{
658 DynBuffer *d = opaque;
659 int new_size, new_allocated_size;
abba3dd1
FB
660
661 /* reallocate buffer if needed */
662 new_size = d->pos + buf_size;
663 new_allocated_size = d->allocated_size;
568e18b1
MN
664 if(new_size < d->pos || new_size > INT_MAX/2)
665 return -1;
abba3dd1
FB
666 while (new_size > new_allocated_size) {
667 if (!new_allocated_size)
668 new_allocated_size = new_size;
669 else
568e18b1 670 new_allocated_size += new_allocated_size / 2 + 1;
abba3dd1
FB
671 }
672
673 if (new_allocated_size > d->allocated_size) {
b88ba823
MH
674 d->buffer = av_realloc(d->buffer, new_allocated_size);
675 if(d->buffer == NULL)
576ae256 676 return -1234;
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677 d->allocated_size = new_allocated_size;
678 }
679 memcpy(d->buffer + d->pos, buf, buf_size);
680 d->pos = new_size;
681 if (d->pos > d->size)
682 d->size = d->pos;
576ae256 683 return buf_size;
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684}
685
576ae256 686static int dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size)
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687{
688 unsigned char buf1[4];
576ae256 689 int ret;
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690
691 /* packetized write: output the header */
692 buf1[0] = (buf_size >> 24);
693 buf1[1] = (buf_size >> 16);
694 buf1[2] = (buf_size >> 8);
695 buf1[3] = (buf_size);
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696 ret= dyn_buf_write(opaque, buf1, 4);
697 if(ret < 0)
698 return ret;
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699
700 /* then the data */
576ae256 701 return dyn_buf_write(opaque, buf, buf_size);
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702}
703
704static int dyn_buf_seek(void *opaque, offset_t offset, int whence)
705{
706 DynBuffer *d = opaque;
707
708 if (whence == SEEK_CUR)
709 offset += d->pos;
710 else if (whence == SEEK_END)
711 offset += d->size;
712 if (offset < 0 || offset > 0x7fffffffLL)
713 return -1;
714 d->pos = offset;
715 return 0;
716}
717
718static int url_open_dyn_buf_internal(ByteIOContext *s, int max_packet_size)
719{
720 DynBuffer *d;
721 int io_buffer_size, ret;
722
723 if (max_packet_size)
724 io_buffer_size = max_packet_size;
725 else
726 io_buffer_size = 1024;
727
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728 if(sizeof(DynBuffer) + io_buffer_size < io_buffer_size)
729 return -1;
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730 d = av_malloc(sizeof(DynBuffer) + io_buffer_size);
731 if (!d)
732 return -1;
733 d->io_buffer_size = io_buffer_size;
734 d->buffer = NULL;
735 d->pos = 0;
736 d->size = 0;
737 d->allocated_size = 0;
738 ret = init_put_byte(s, d->io_buffer, io_buffer_size,
739 1, d, NULL,
740 max_packet_size ? dyn_packet_buf_write : dyn_buf_write,
741 max_packet_size ? NULL : dyn_buf_seek);
742 if (ret == 0) {
743 s->max_packet_size = max_packet_size;
744 }
745 return ret;
746}
747
748/*
749 * Open a write only memory stream.
750 *
751 * @param s new IO context
752 * @return zero if no error.
753 */
754int url_open_dyn_buf(ByteIOContext *s)
755{
756 return url_open_dyn_buf_internal(s, 0);
757}
758
759/*
760 * Open a write only packetized memory stream with a maximum packet
761 * size of 'max_packet_size'. The stream is stored in a memory buffer
762 * with a big endian 4 byte header giving the packet size in bytes.
763 *
764 * @param s new IO context
765 * @param max_packet_size maximum packet size (must be > 0)
766 * @return zero if no error.
767 */
768int url_open_dyn_packet_buf(ByteIOContext *s, int max_packet_size)
769{
770 if (max_packet_size <= 0)
771 return -1;
772 return url_open_dyn_buf_internal(s, max_packet_size);
773}
774
775/*
776 * Return the written size and a pointer to the buffer. The buffer
777 * must be freed with av_free().
778 * @param s IO context
779 * @param pointer to a byte buffer
780 * @return the length of the byte buffer
781 */
0c1a9eda 782int url_close_dyn_buf(ByteIOContext *s, uint8_t **pbuffer)
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783{
784 DynBuffer *d = s->opaque;
785 int size;
786
787 put_flush_packet(s);
788
789 *pbuffer = d->buffer;
790 size = d->size;
791 av_free(d);
792 return size;
793}
764ef400 794#endif //CONFIG_ENCODERS