ffmpeg / libavformat / aviobuf.c @ 2912e87a
History | View | Annotate | Download (27.2 KB)
| 1 |
/*
|
|---|---|
| 2 |
* Buffered I/O for ffmpeg system
|
| 3 |
* Copyright (c) 2000,2001 Fabrice Bellard
|
| 4 |
*
|
| 5 |
* This file is part of Libav.
|
| 6 |
*
|
| 7 |
* Libav 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 |
*
|
| 12 |
* Libav is distributed in the hope that it will be useful,
|
| 13 |
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
| 14 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
| 15 |
* Lesser General Public License for more details.
|
| 16 |
*
|
| 17 |
* You should have received a copy of the GNU Lesser General Public
|
| 18 |
* License along with Libav; if not, write to the Free Software
|
| 19 |
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
| 20 |
*/
|
| 21 |
|
| 22 |
#include "libavutil/crc.h" |
| 23 |
#include "libavutil/intreadwrite.h" |
| 24 |
#include "avformat.h" |
| 25 |
#include "avio.h" |
| 26 |
#include "avio_internal.h" |
| 27 |
#include "internal.h" |
| 28 |
#include <stdarg.h> |
| 29 |
|
| 30 |
#define IO_BUFFER_SIZE 32768 |
| 31 |
|
| 32 |
/**
|
| 33 |
* Do seeks within this distance ahead of the current buffer by skipping
|
| 34 |
* data instead of calling the protocol seek function, for seekable
|
| 35 |
* protocols.
|
| 36 |
*/
|
| 37 |
#define SHORT_SEEK_THRESHOLD 4096 |
| 38 |
|
| 39 |
static void fill_buffer(AVIOContext *s); |
| 40 |
#if !FF_API_URL_RESETBUF
|
| 41 |
static int url_resetbuf(AVIOContext *s, int flags); |
| 42 |
#endif
|
| 43 |
|
| 44 |
int ffio_init_context(AVIOContext *s,
|
| 45 |
unsigned char *buffer, |
| 46 |
int buffer_size,
|
| 47 |
int write_flag,
|
| 48 |
void *opaque,
|
| 49 |
int (*read_packet)(void *opaque, uint8_t *buf, int buf_size), |
| 50 |
int (*write_packet)(void *opaque, uint8_t *buf, int buf_size), |
| 51 |
int64_t (*seek)(void *opaque, int64_t offset, int whence)) |
| 52 |
{
|
| 53 |
s->buffer = buffer; |
| 54 |
s->buffer_size = buffer_size; |
| 55 |
s->buf_ptr = buffer; |
| 56 |
s->opaque = opaque; |
| 57 |
url_resetbuf(s, write_flag ? URL_WRONLY : URL_RDONLY); |
| 58 |
s->write_packet = write_packet; |
| 59 |
s->read_packet = read_packet; |
| 60 |
s->seek = seek; |
| 61 |
s->pos = 0;
|
| 62 |
s->must_flush = 0;
|
| 63 |
s->eof_reached = 0;
|
| 64 |
s->error = 0;
|
| 65 |
s->is_streamed = 0;
|
| 66 |
s->max_packet_size = 0;
|
| 67 |
s->update_checksum= NULL;
|
| 68 |
if(!read_packet && !write_flag){
|
| 69 |
s->pos = buffer_size; |
| 70 |
s->buf_end = s->buffer + buffer_size; |
| 71 |
} |
| 72 |
s->read_pause = NULL;
|
| 73 |
s->read_seek = NULL;
|
| 74 |
return 0; |
| 75 |
} |
| 76 |
|
| 77 |
#if FF_API_OLD_AVIO
|
| 78 |
int init_put_byte(AVIOContext *s,
|
| 79 |
unsigned char *buffer, |
| 80 |
int buffer_size,
|
| 81 |
int write_flag,
|
| 82 |
void *opaque,
|
| 83 |
int (*read_packet)(void *opaque, uint8_t *buf, int buf_size), |
| 84 |
int (*write_packet)(void *opaque, uint8_t *buf, int buf_size), |
| 85 |
int64_t (*seek)(void *opaque, int64_t offset, int whence)) |
| 86 |
{
|
| 87 |
return ffio_init_context(s, buffer, buffer_size, write_flag, opaque,
|
| 88 |
read_packet, write_packet, seek); |
| 89 |
} |
| 90 |
AVIOContext *av_alloc_put_byte( |
| 91 |
unsigned char *buffer, |
| 92 |
int buffer_size,
|
| 93 |
int write_flag,
|
| 94 |
void *opaque,
|
| 95 |
int (*read_packet)(void *opaque, uint8_t *buf, int buf_size), |
| 96 |
int (*write_packet)(void *opaque, uint8_t *buf, int buf_size), |
| 97 |
int64_t (*seek)(void *opaque, int64_t offset, int whence)) |
| 98 |
{
|
| 99 |
return avio_alloc_context(buffer, buffer_size, write_flag, opaque,
|
| 100 |
read_packet, write_packet, seek); |
| 101 |
} |
| 102 |
#endif
|
| 103 |
|
| 104 |
AVIOContext *avio_alloc_context( |
| 105 |
unsigned char *buffer, |
| 106 |
int buffer_size,
|
| 107 |
int write_flag,
|
| 108 |
void *opaque,
|
| 109 |
int (*read_packet)(void *opaque, uint8_t *buf, int buf_size), |
| 110 |
int (*write_packet)(void *opaque, uint8_t *buf, int buf_size), |
| 111 |
int64_t (*seek)(void *opaque, int64_t offset, int whence)) |
| 112 |
{
|
| 113 |
AVIOContext *s = av_mallocz(sizeof(AVIOContext));
|
| 114 |
ffio_init_context(s, buffer, buffer_size, write_flag, opaque, |
| 115 |
read_packet, write_packet, seek); |
| 116 |
return s;
|
| 117 |
} |
| 118 |
|
| 119 |
static void flush_buffer(AVIOContext *s) |
| 120 |
{
|
| 121 |
if (s->buf_ptr > s->buffer) {
|
| 122 |
if (s->write_packet && !s->error){
|
| 123 |
int ret= s->write_packet(s->opaque, s->buffer, s->buf_ptr - s->buffer);
|
| 124 |
if(ret < 0){ |
| 125 |
s->error = ret; |
| 126 |
} |
| 127 |
} |
| 128 |
if(s->update_checksum){
|
| 129 |
s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr); |
| 130 |
s->checksum_ptr= s->buffer; |
| 131 |
} |
| 132 |
s->pos += s->buf_ptr - s->buffer; |
| 133 |
} |
| 134 |
s->buf_ptr = s->buffer; |
| 135 |
} |
| 136 |
|
| 137 |
void avio_w8(AVIOContext *s, int b) |
| 138 |
{
|
| 139 |
*(s->buf_ptr)++ = b; |
| 140 |
if (s->buf_ptr >= s->buf_end)
|
| 141 |
flush_buffer(s); |
| 142 |
} |
| 143 |
|
| 144 |
void ffio_fill(AVIOContext *s, int b, int count) |
| 145 |
{
|
| 146 |
while (count > 0) { |
| 147 |
int len = FFMIN(s->buf_end - s->buf_ptr, count);
|
| 148 |
memset(s->buf_ptr, b, len); |
| 149 |
s->buf_ptr += len; |
| 150 |
|
| 151 |
if (s->buf_ptr >= s->buf_end)
|
| 152 |
flush_buffer(s); |
| 153 |
|
| 154 |
count -= len; |
| 155 |
} |
| 156 |
} |
| 157 |
|
| 158 |
void avio_write(AVIOContext *s, const unsigned char *buf, int size) |
| 159 |
{
|
| 160 |
while (size > 0) { |
| 161 |
int len = FFMIN(s->buf_end - s->buf_ptr, size);
|
| 162 |
memcpy(s->buf_ptr, buf, len); |
| 163 |
s->buf_ptr += len; |
| 164 |
|
| 165 |
if (s->buf_ptr >= s->buf_end)
|
| 166 |
flush_buffer(s); |
| 167 |
|
| 168 |
buf += len; |
| 169 |
size -= len; |
| 170 |
} |
| 171 |
} |
| 172 |
|
| 173 |
void avio_flush(AVIOContext *s)
|
| 174 |
{
|
| 175 |
flush_buffer(s); |
| 176 |
s->must_flush = 0;
|
| 177 |
} |
| 178 |
|
| 179 |
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
|
| 180 |
{
|
| 181 |
int64_t offset1; |
| 182 |
int64_t pos; |
| 183 |
int force = whence & AVSEEK_FORCE;
|
| 184 |
whence &= ~AVSEEK_FORCE; |
| 185 |
|
| 186 |
if(!s)
|
| 187 |
return AVERROR(EINVAL);
|
| 188 |
|
| 189 |
pos = s->pos - (s->write_flag ? 0 : (s->buf_end - s->buffer));
|
| 190 |
|
| 191 |
if (whence != SEEK_CUR && whence != SEEK_SET)
|
| 192 |
return AVERROR(EINVAL);
|
| 193 |
|
| 194 |
if (whence == SEEK_CUR) {
|
| 195 |
offset1 = pos + (s->buf_ptr - s->buffer); |
| 196 |
if (offset == 0) |
| 197 |
return offset1;
|
| 198 |
offset += offset1; |
| 199 |
} |
| 200 |
offset1 = offset - pos; |
| 201 |
if (!s->must_flush &&
|
| 202 |
offset1 >= 0 && offset1 <= (s->buf_end - s->buffer)) {
|
| 203 |
/* can do the seek inside the buffer */
|
| 204 |
s->buf_ptr = s->buffer + offset1; |
| 205 |
} else if ((s->is_streamed || |
| 206 |
offset1 <= s->buf_end + SHORT_SEEK_THRESHOLD - s->buffer) && |
| 207 |
!s->write_flag && offset1 >= 0 &&
|
| 208 |
(whence != SEEK_END || force)) {
|
| 209 |
while(s->pos < offset && !s->eof_reached)
|
| 210 |
fill_buffer(s); |
| 211 |
if (s->eof_reached)
|
| 212 |
return AVERROR_EOF;
|
| 213 |
s->buf_ptr = s->buf_end + offset - s->pos; |
| 214 |
} else {
|
| 215 |
int64_t res; |
| 216 |
|
| 217 |
#if CONFIG_MUXERS || CONFIG_NETWORK
|
| 218 |
if (s->write_flag) {
|
| 219 |
flush_buffer(s); |
| 220 |
s->must_flush = 1;
|
| 221 |
} |
| 222 |
#endif /* CONFIG_MUXERS || CONFIG_NETWORK */ |
| 223 |
if (!s->seek)
|
| 224 |
return AVERROR(EPIPE);
|
| 225 |
if ((res = s->seek(s->opaque, offset, SEEK_SET)) < 0) |
| 226 |
return res;
|
| 227 |
if (!s->write_flag)
|
| 228 |
s->buf_end = s->buffer; |
| 229 |
s->buf_ptr = s->buffer; |
| 230 |
s->pos = offset; |
| 231 |
} |
| 232 |
s->eof_reached = 0;
|
| 233 |
return offset;
|
| 234 |
} |
| 235 |
|
| 236 |
#if FF_API_OLD_AVIO
|
| 237 |
int url_fskip(AVIOContext *s, int64_t offset)
|
| 238 |
{
|
| 239 |
int64_t ret = avio_seek(s, offset, SEEK_CUR); |
| 240 |
return ret < 0 ? ret : 0; |
| 241 |
} |
| 242 |
|
| 243 |
int64_t url_ftell(AVIOContext *s) |
| 244 |
{
|
| 245 |
return avio_seek(s, 0, SEEK_CUR); |
| 246 |
} |
| 247 |
#endif
|
| 248 |
|
| 249 |
int64_t avio_size(AVIOContext *s) |
| 250 |
{
|
| 251 |
int64_t size; |
| 252 |
|
| 253 |
if(!s)
|
| 254 |
return AVERROR(EINVAL);
|
| 255 |
|
| 256 |
if (!s->seek)
|
| 257 |
return AVERROR(ENOSYS);
|
| 258 |
size = s->seek(s->opaque, 0, AVSEEK_SIZE);
|
| 259 |
if(size<0){ |
| 260 |
if ((size = s->seek(s->opaque, -1, SEEK_END)) < 0) |
| 261 |
return size;
|
| 262 |
size++; |
| 263 |
s->seek(s->opaque, s->pos, SEEK_SET); |
| 264 |
} |
| 265 |
return size;
|
| 266 |
} |
| 267 |
|
| 268 |
#if FF_API_OLD_AVIO
|
| 269 |
int url_feof(AVIOContext *s)
|
| 270 |
{
|
| 271 |
if(!s)
|
| 272 |
return 0; |
| 273 |
return s->eof_reached;
|
| 274 |
} |
| 275 |
|
| 276 |
int url_ferror(AVIOContext *s)
|
| 277 |
{
|
| 278 |
if(!s)
|
| 279 |
return 0; |
| 280 |
return s->error;
|
| 281 |
} |
| 282 |
#endif
|
| 283 |
|
| 284 |
void avio_wl32(AVIOContext *s, unsigned int val) |
| 285 |
{
|
| 286 |
avio_w8(s, val); |
| 287 |
avio_w8(s, val >> 8);
|
| 288 |
avio_w8(s, val >> 16);
|
| 289 |
avio_w8(s, val >> 24);
|
| 290 |
} |
| 291 |
|
| 292 |
void avio_wb32(AVIOContext *s, unsigned int val) |
| 293 |
{
|
| 294 |
avio_w8(s, val >> 24);
|
| 295 |
avio_w8(s, val >> 16);
|
| 296 |
avio_w8(s, val >> 8);
|
| 297 |
avio_w8(s, val); |
| 298 |
} |
| 299 |
|
| 300 |
#if FF_API_OLD_AVIO
|
| 301 |
void put_strz(AVIOContext *s, const char *str) |
| 302 |
{
|
| 303 |
avio_put_str(s, str); |
| 304 |
} |
| 305 |
|
| 306 |
#define GET(name, type) \
|
| 307 |
type get_be ##name(AVIOContext *s) \ |
| 308 |
{\
|
| 309 |
return avio_rb ##name(s);\ |
| 310 |
}\ |
| 311 |
type get_le ##name(AVIOContext *s) \ |
| 312 |
{\
|
| 313 |
return avio_rl ##name(s);\ |
| 314 |
} |
| 315 |
|
| 316 |
GET(16, unsigned int) |
| 317 |
GET(24, unsigned int) |
| 318 |
GET(32, unsigned int) |
| 319 |
GET(64, uint64_t)
|
| 320 |
|
| 321 |
#undef GET
|
| 322 |
|
| 323 |
#define PUT(name, type ) \
|
| 324 |
void put_le ##name(AVIOContext *s, type val)\ |
| 325 |
{\
|
| 326 |
avio_wl ##name(s, val);\ |
| 327 |
}\ |
| 328 |
void put_be ##name(AVIOContext *s, type val)\ |
| 329 |
{\
|
| 330 |
avio_wb ##name(s, val);\ |
| 331 |
} |
| 332 |
|
| 333 |
PUT(16, unsigned int) |
| 334 |
PUT(24, unsigned int) |
| 335 |
PUT(32, unsigned int) |
| 336 |
PUT(64, uint64_t)
|
| 337 |
#undef PUT
|
| 338 |
|
| 339 |
int get_byte(AVIOContext *s)
|
| 340 |
{
|
| 341 |
return avio_r8(s);
|
| 342 |
} |
| 343 |
int get_buffer(AVIOContext *s, unsigned char *buf, int size) |
| 344 |
{
|
| 345 |
return avio_read(s, buf, size);
|
| 346 |
} |
| 347 |
int get_partial_buffer(AVIOContext *s, unsigned char *buf, int size) |
| 348 |
{
|
| 349 |
return ffio_read_partial(s, buf, size);
|
| 350 |
} |
| 351 |
void put_byte(AVIOContext *s, int val) |
| 352 |
{
|
| 353 |
avio_w8(s, val); |
| 354 |
} |
| 355 |
void put_buffer(AVIOContext *s, const unsigned char *buf, int size) |
| 356 |
{
|
| 357 |
avio_write(s, buf, size); |
| 358 |
} |
| 359 |
void put_nbyte(AVIOContext *s, int b, int count) |
| 360 |
{
|
| 361 |
ffio_fill(s, b, count); |
| 362 |
} |
| 363 |
|
| 364 |
int url_fopen(AVIOContext **s, const char *filename, int flags) |
| 365 |
{
|
| 366 |
return avio_open(s, filename, flags);
|
| 367 |
} |
| 368 |
int url_fclose(AVIOContext *s)
|
| 369 |
{
|
| 370 |
return avio_close(s);
|
| 371 |
} |
| 372 |
int64_t url_fseek(AVIOContext *s, int64_t offset, int whence)
|
| 373 |
{
|
| 374 |
return avio_seek(s, offset, whence);
|
| 375 |
} |
| 376 |
int64_t url_fsize(AVIOContext *s) |
| 377 |
{
|
| 378 |
return avio_size(s);
|
| 379 |
} |
| 380 |
int url_setbufsize(AVIOContext *s, int buf_size) |
| 381 |
{
|
| 382 |
return ffio_set_buf_size(s, buf_size);
|
| 383 |
} |
| 384 |
int url_fprintf(AVIOContext *s, const char *fmt, ...) |
| 385 |
{
|
| 386 |
va_list ap; |
| 387 |
char buf[4096]; |
| 388 |
int ret;
|
| 389 |
|
| 390 |
va_start(ap, fmt); |
| 391 |
ret = vsnprintf(buf, sizeof(buf), fmt, ap);
|
| 392 |
va_end(ap); |
| 393 |
avio_write(s, buf, strlen(buf)); |
| 394 |
return ret;
|
| 395 |
} |
| 396 |
void put_flush_packet(AVIOContext *s)
|
| 397 |
{
|
| 398 |
avio_flush(s); |
| 399 |
} |
| 400 |
#endif
|
| 401 |
|
| 402 |
int avio_put_str(AVIOContext *s, const char *str) |
| 403 |
{
|
| 404 |
int len = 1; |
| 405 |
if (str) {
|
| 406 |
len += strlen(str); |
| 407 |
avio_write(s, (const unsigned char *) str, len); |
| 408 |
} else
|
| 409 |
avio_w8(s, 0);
|
| 410 |
return len;
|
| 411 |
} |
| 412 |
|
| 413 |
int avio_put_str16le(AVIOContext *s, const char *str) |
| 414 |
{
|
| 415 |
const uint8_t *q = str;
|
| 416 |
int ret = 0; |
| 417 |
|
| 418 |
while (*q) {
|
| 419 |
uint32_t ch; |
| 420 |
uint16_t tmp; |
| 421 |
|
| 422 |
GET_UTF8(ch, *q++, break;)
|
| 423 |
PUT_UTF16(ch, tmp, avio_wl16(s, tmp);ret += 2;)
|
| 424 |
} |
| 425 |
avio_wl16(s, 0);
|
| 426 |
ret += 2;
|
| 427 |
return ret;
|
| 428 |
} |
| 429 |
|
| 430 |
int ff_get_v_length(uint64_t val){
|
| 431 |
int i=1; |
| 432 |
|
| 433 |
while(val>>=7) |
| 434 |
i++; |
| 435 |
|
| 436 |
return i;
|
| 437 |
} |
| 438 |
|
| 439 |
void ff_put_v(AVIOContext *bc, uint64_t val){
|
| 440 |
int i= ff_get_v_length(val);
|
| 441 |
|
| 442 |
while(--i>0) |
| 443 |
avio_w8(bc, 128 | (val>>(7*i))); |
| 444 |
|
| 445 |
avio_w8(bc, val&127);
|
| 446 |
} |
| 447 |
|
| 448 |
void avio_wl64(AVIOContext *s, uint64_t val)
|
| 449 |
{
|
| 450 |
avio_wl32(s, (uint32_t)(val & 0xffffffff));
|
| 451 |
avio_wl32(s, (uint32_t)(val >> 32));
|
| 452 |
} |
| 453 |
|
| 454 |
void avio_wb64(AVIOContext *s, uint64_t val)
|
| 455 |
{
|
| 456 |
avio_wb32(s, (uint32_t)(val >> 32));
|
| 457 |
avio_wb32(s, (uint32_t)(val & 0xffffffff));
|
| 458 |
} |
| 459 |
|
| 460 |
void avio_wl16(AVIOContext *s, unsigned int val) |
| 461 |
{
|
| 462 |
avio_w8(s, val); |
| 463 |
avio_w8(s, val >> 8);
|
| 464 |
} |
| 465 |
|
| 466 |
void avio_wb16(AVIOContext *s, unsigned int val) |
| 467 |
{
|
| 468 |
avio_w8(s, val >> 8);
|
| 469 |
avio_w8(s, val); |
| 470 |
} |
| 471 |
|
| 472 |
void avio_wl24(AVIOContext *s, unsigned int val) |
| 473 |
{
|
| 474 |
avio_wl16(s, val & 0xffff);
|
| 475 |
avio_w8(s, val >> 16);
|
| 476 |
} |
| 477 |
|
| 478 |
void avio_wb24(AVIOContext *s, unsigned int val) |
| 479 |
{
|
| 480 |
avio_wb16(s, val >> 8);
|
| 481 |
avio_w8(s, val); |
| 482 |
} |
| 483 |
|
| 484 |
#if FF_API_OLD_AVIO
|
| 485 |
void put_tag(AVIOContext *s, const char *tag) |
| 486 |
{
|
| 487 |
while (*tag) {
|
| 488 |
avio_w8(s, *tag++); |
| 489 |
} |
| 490 |
} |
| 491 |
#endif
|
| 492 |
|
| 493 |
/* Input stream */
|
| 494 |
|
| 495 |
static void fill_buffer(AVIOContext *s) |
| 496 |
{
|
| 497 |
uint8_t *dst= !s->max_packet_size && s->buf_end - s->buffer < s->buffer_size ? s->buf_end : s->buffer; |
| 498 |
int len= s->buffer_size - (dst - s->buffer);
|
| 499 |
int max_buffer_size = s->max_packet_size ? s->max_packet_size : IO_BUFFER_SIZE;
|
| 500 |
|
| 501 |
/* no need to do anything if EOF already reached */
|
| 502 |
if (s->eof_reached)
|
| 503 |
return;
|
| 504 |
|
| 505 |
if(s->update_checksum && dst == s->buffer){
|
| 506 |
if(s->buf_end > s->checksum_ptr)
|
| 507 |
s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_end - s->checksum_ptr); |
| 508 |
s->checksum_ptr= s->buffer; |
| 509 |
} |
| 510 |
|
| 511 |
/* make buffer smaller in case it ended up large after probing */
|
| 512 |
if (s->buffer_size > max_buffer_size) {
|
| 513 |
ffio_set_buf_size(s, max_buffer_size); |
| 514 |
|
| 515 |
s->checksum_ptr = dst = s->buffer; |
| 516 |
len = s->buffer_size; |
| 517 |
} |
| 518 |
|
| 519 |
if(s->read_packet)
|
| 520 |
len = s->read_packet(s->opaque, dst, len); |
| 521 |
else
|
| 522 |
len = 0;
|
| 523 |
if (len <= 0) { |
| 524 |
/* do not modify buffer if EOF reached so that a seek back can
|
| 525 |
be done without rereading data */
|
| 526 |
s->eof_reached = 1;
|
| 527 |
if(len<0) |
| 528 |
s->error= len; |
| 529 |
} else {
|
| 530 |
s->pos += len; |
| 531 |
s->buf_ptr = dst; |
| 532 |
s->buf_end = dst + len; |
| 533 |
} |
| 534 |
} |
| 535 |
|
| 536 |
unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf, |
| 537 |
unsigned int len) |
| 538 |
{
|
| 539 |
return av_crc(av_crc_get_table(AV_CRC_32_IEEE), checksum, buf, len);
|
| 540 |
} |
| 541 |
|
| 542 |
unsigned long get_checksum(AVIOContext *s) |
| 543 |
{
|
| 544 |
s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr); |
| 545 |
s->update_checksum= NULL;
|
| 546 |
return s->checksum;
|
| 547 |
} |
| 548 |
|
| 549 |
void init_checksum(AVIOContext *s,
|
| 550 |
unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len), |
| 551 |
unsigned long checksum) |
| 552 |
{
|
| 553 |
s->update_checksum= update_checksum; |
| 554 |
if(s->update_checksum){
|
| 555 |
s->checksum= checksum; |
| 556 |
s->checksum_ptr= s->buf_ptr; |
| 557 |
} |
| 558 |
} |
| 559 |
|
| 560 |
/* XXX: put an inline version */
|
| 561 |
int avio_r8(AVIOContext *s)
|
| 562 |
{
|
| 563 |
if (s->buf_ptr >= s->buf_end)
|
| 564 |
fill_buffer(s); |
| 565 |
if (s->buf_ptr < s->buf_end)
|
| 566 |
return *s->buf_ptr++;
|
| 567 |
return 0; |
| 568 |
} |
| 569 |
|
| 570 |
#if FF_API_OLD_AVIO
|
| 571 |
int url_fgetc(AVIOContext *s)
|
| 572 |
{
|
| 573 |
if (s->buf_ptr >= s->buf_end)
|
| 574 |
fill_buffer(s); |
| 575 |
if (s->buf_ptr < s->buf_end)
|
| 576 |
return *s->buf_ptr++;
|
| 577 |
return URL_EOF;
|
| 578 |
} |
| 579 |
#endif
|
| 580 |
|
| 581 |
int avio_read(AVIOContext *s, unsigned char *buf, int size) |
| 582 |
{
|
| 583 |
int len, size1;
|
| 584 |
|
| 585 |
size1 = size; |
| 586 |
while (size > 0) { |
| 587 |
len = s->buf_end - s->buf_ptr; |
| 588 |
if (len > size)
|
| 589 |
len = size; |
| 590 |
if (len == 0) { |
| 591 |
if(size > s->buffer_size && !s->update_checksum){
|
| 592 |
if(s->read_packet)
|
| 593 |
len = s->read_packet(s->opaque, buf, size); |
| 594 |
if (len <= 0) { |
| 595 |
/* do not modify buffer if EOF reached so that a seek back can
|
| 596 |
be done without rereading data */
|
| 597 |
s->eof_reached = 1;
|
| 598 |
if(len<0) |
| 599 |
s->error= len; |
| 600 |
break;
|
| 601 |
} else {
|
| 602 |
s->pos += len; |
| 603 |
size -= len; |
| 604 |
buf += len; |
| 605 |
s->buf_ptr = s->buffer; |
| 606 |
s->buf_end = s->buffer/* + len*/;
|
| 607 |
} |
| 608 |
}else{
|
| 609 |
fill_buffer(s); |
| 610 |
len = s->buf_end - s->buf_ptr; |
| 611 |
if (len == 0) |
| 612 |
break;
|
| 613 |
} |
| 614 |
} else {
|
| 615 |
memcpy(buf, s->buf_ptr, len); |
| 616 |
buf += len; |
| 617 |
s->buf_ptr += len; |
| 618 |
size -= len; |
| 619 |
} |
| 620 |
} |
| 621 |
if (size1 == size) {
|
| 622 |
if (s->error) return s->error; |
| 623 |
if (s->eof_reached) return AVERROR_EOF; |
| 624 |
} |
| 625 |
return size1 - size;
|
| 626 |
} |
| 627 |
|
| 628 |
int ffio_read_partial(AVIOContext *s, unsigned char *buf, int size) |
| 629 |
{
|
| 630 |
int len;
|
| 631 |
|
| 632 |
if(size<0) |
| 633 |
return -1; |
| 634 |
|
| 635 |
len = s->buf_end - s->buf_ptr; |
| 636 |
if (len == 0) { |
| 637 |
fill_buffer(s); |
| 638 |
len = s->buf_end - s->buf_ptr; |
| 639 |
} |
| 640 |
if (len > size)
|
| 641 |
len = size; |
| 642 |
memcpy(buf, s->buf_ptr, len); |
| 643 |
s->buf_ptr += len; |
| 644 |
if (!len) {
|
| 645 |
if (s->error) return s->error; |
| 646 |
if (s->eof_reached) return AVERROR_EOF; |
| 647 |
} |
| 648 |
return len;
|
| 649 |
} |
| 650 |
|
| 651 |
unsigned int avio_rl16(AVIOContext *s) |
| 652 |
{
|
| 653 |
unsigned int val; |
| 654 |
val = avio_r8(s); |
| 655 |
val |= avio_r8(s) << 8;
|
| 656 |
return val;
|
| 657 |
} |
| 658 |
|
| 659 |
unsigned int avio_rl24(AVIOContext *s) |
| 660 |
{
|
| 661 |
unsigned int val; |
| 662 |
val = avio_rl16(s); |
| 663 |
val |= avio_r8(s) << 16;
|
| 664 |
return val;
|
| 665 |
} |
| 666 |
|
| 667 |
unsigned int avio_rl32(AVIOContext *s) |
| 668 |
{
|
| 669 |
unsigned int val; |
| 670 |
val = avio_rl16(s); |
| 671 |
val |= avio_rl16(s) << 16;
|
| 672 |
return val;
|
| 673 |
} |
| 674 |
|
| 675 |
uint64_t avio_rl64(AVIOContext *s) |
| 676 |
{
|
| 677 |
uint64_t val; |
| 678 |
val = (uint64_t)avio_rl32(s); |
| 679 |
val |= (uint64_t)avio_rl32(s) << 32;
|
| 680 |
return val;
|
| 681 |
} |
| 682 |
|
| 683 |
unsigned int avio_rb16(AVIOContext *s) |
| 684 |
{
|
| 685 |
unsigned int val; |
| 686 |
val = avio_r8(s) << 8;
|
| 687 |
val |= avio_r8(s); |
| 688 |
return val;
|
| 689 |
} |
| 690 |
|
| 691 |
unsigned int avio_rb24(AVIOContext *s) |
| 692 |
{
|
| 693 |
unsigned int val; |
| 694 |
val = avio_rb16(s) << 8;
|
| 695 |
val |= avio_r8(s); |
| 696 |
return val;
|
| 697 |
} |
| 698 |
unsigned int avio_rb32(AVIOContext *s) |
| 699 |
{
|
| 700 |
unsigned int val; |
| 701 |
val = avio_rb16(s) << 16;
|
| 702 |
val |= avio_rb16(s); |
| 703 |
return val;
|
| 704 |
} |
| 705 |
|
| 706 |
#if FF_API_OLD_AVIO
|
| 707 |
char *get_strz(AVIOContext *s, char *buf, int maxlen) |
| 708 |
{
|
| 709 |
avio_get_str(s, INT_MAX, buf, maxlen); |
| 710 |
return buf;
|
| 711 |
} |
| 712 |
#endif
|
| 713 |
|
| 714 |
int ff_get_line(AVIOContext *s, char *buf, int maxlen) |
| 715 |
{
|
| 716 |
int i = 0; |
| 717 |
char c;
|
| 718 |
|
| 719 |
do {
|
| 720 |
c = avio_r8(s); |
| 721 |
if (c && i < maxlen-1) |
| 722 |
buf[i++] = c; |
| 723 |
} while (c != '\n' && c); |
| 724 |
|
| 725 |
buf[i] = 0;
|
| 726 |
return i;
|
| 727 |
} |
| 728 |
|
| 729 |
int avio_get_str(AVIOContext *s, int maxlen, char *buf, int buflen) |
| 730 |
{
|
| 731 |
int i;
|
| 732 |
|
| 733 |
// reserve 1 byte for terminating 0
|
| 734 |
buflen = FFMIN(buflen - 1, maxlen);
|
| 735 |
for (i = 0; i < buflen; i++) |
| 736 |
if (!(buf[i] = avio_r8(s)))
|
| 737 |
return i + 1; |
| 738 |
if (buflen)
|
| 739 |
buf[i] = 0;
|
| 740 |
for (; i < maxlen; i++)
|
| 741 |
if (!avio_r8(s))
|
| 742 |
return i + 1; |
| 743 |
return maxlen;
|
| 744 |
} |
| 745 |
|
| 746 |
#define GET_STR16(type, read) \
|
| 747 |
int avio_get_str16 ##type(AVIOContext *pb, int maxlen, char *buf, int buflen)\ |
| 748 |
{\
|
| 749 |
char* q = buf;\
|
| 750 |
int ret = 0;\ |
| 751 |
while (ret + 1 < maxlen) {\ |
| 752 |
uint8_t tmp;\ |
| 753 |
uint32_t ch;\ |
| 754 |
GET_UTF16(ch, (ret += 2) <= maxlen ? read(pb) : 0, break;)\ |
| 755 |
if (!ch)\
|
| 756 |
break;\
|
| 757 |
PUT_UTF8(ch, tmp, if (q - buf < buflen - 1) *q++ = tmp;)\ |
| 758 |
}\ |
| 759 |
*q = 0;\
|
| 760 |
return ret;\
|
| 761 |
}\ |
| 762 |
|
| 763 |
GET_STR16(le, avio_rl16) |
| 764 |
GET_STR16(be, avio_rb16) |
| 765 |
|
| 766 |
#undef GET_STR16
|
| 767 |
|
| 768 |
uint64_t avio_rb64(AVIOContext *s) |
| 769 |
{
|
| 770 |
uint64_t val; |
| 771 |
val = (uint64_t)avio_rb32(s) << 32;
|
| 772 |
val |= (uint64_t)avio_rb32(s); |
| 773 |
return val;
|
| 774 |
} |
| 775 |
|
| 776 |
uint64_t ffio_read_varlen(AVIOContext *bc){
|
| 777 |
uint64_t val = 0;
|
| 778 |
int tmp;
|
| 779 |
|
| 780 |
do{
|
| 781 |
tmp = avio_r8(bc); |
| 782 |
val= (val<<7) + (tmp&127); |
| 783 |
}while(tmp&128); |
| 784 |
return val;
|
| 785 |
} |
| 786 |
|
| 787 |
int url_fdopen(AVIOContext **s, URLContext *h)
|
| 788 |
{
|
| 789 |
uint8_t *buffer; |
| 790 |
int buffer_size, max_packet_size;
|
| 791 |
|
| 792 |
max_packet_size = url_get_max_packet_size(h); |
| 793 |
if (max_packet_size) {
|
| 794 |
buffer_size = max_packet_size; /* no need to bufferize more than one packet */
|
| 795 |
} else {
|
| 796 |
buffer_size = IO_BUFFER_SIZE; |
| 797 |
} |
| 798 |
buffer = av_malloc(buffer_size); |
| 799 |
if (!buffer)
|
| 800 |
return AVERROR(ENOMEM);
|
| 801 |
|
| 802 |
*s = av_mallocz(sizeof(AVIOContext));
|
| 803 |
if(!*s) {
|
| 804 |
av_free(buffer); |
| 805 |
return AVERROR(ENOMEM);
|
| 806 |
} |
| 807 |
|
| 808 |
if (ffio_init_context(*s, buffer, buffer_size,
|
| 809 |
(h->flags & URL_WRONLY || h->flags & URL_RDWR), h, |
| 810 |
url_read, url_write, url_seek) < 0) {
|
| 811 |
av_free(buffer); |
| 812 |
av_freep(s); |
| 813 |
return AVERROR(EIO);
|
| 814 |
} |
| 815 |
(*s)->is_streamed = h->is_streamed; |
| 816 |
(*s)->max_packet_size = max_packet_size; |
| 817 |
if(h->prot) {
|
| 818 |
(*s)->read_pause = (int (*)(void *, int))h->prot->url_read_pause; |
| 819 |
(*s)->read_seek = (int64_t (*)(void *, int, int64_t, int))h->prot->url_read_seek; |
| 820 |
} |
| 821 |
return 0; |
| 822 |
} |
| 823 |
|
| 824 |
int ffio_set_buf_size(AVIOContext *s, int buf_size) |
| 825 |
{
|
| 826 |
uint8_t *buffer; |
| 827 |
buffer = av_malloc(buf_size); |
| 828 |
if (!buffer)
|
| 829 |
return AVERROR(ENOMEM);
|
| 830 |
|
| 831 |
av_free(s->buffer); |
| 832 |
s->buffer = buffer; |
| 833 |
s->buffer_size = buf_size; |
| 834 |
s->buf_ptr = buffer; |
| 835 |
url_resetbuf(s, s->write_flag ? URL_WRONLY : URL_RDONLY); |
| 836 |
return 0; |
| 837 |
} |
| 838 |
|
| 839 |
#if FF_API_URL_RESETBUF
|
| 840 |
int url_resetbuf(AVIOContext *s, int flags) |
| 841 |
#else
|
| 842 |
static int url_resetbuf(AVIOContext *s, int flags) |
| 843 |
#endif
|
| 844 |
{
|
| 845 |
#if FF_API_URL_RESETBUF
|
| 846 |
if (flags & URL_RDWR)
|
| 847 |
return AVERROR(EINVAL);
|
| 848 |
#else
|
| 849 |
assert(flags == URL_WRONLY || flags == URL_RDONLY); |
| 850 |
#endif
|
| 851 |
|
| 852 |
if (flags & URL_WRONLY) {
|
| 853 |
s->buf_end = s->buffer + s->buffer_size; |
| 854 |
s->write_flag = 1;
|
| 855 |
} else {
|
| 856 |
s->buf_end = s->buffer; |
| 857 |
s->write_flag = 0;
|
| 858 |
} |
| 859 |
return 0; |
| 860 |
} |
| 861 |
|
| 862 |
int ffio_rewind_with_probe_data(AVIOContext *s, unsigned char *buf, int buf_size) |
| 863 |
{
|
| 864 |
int64_t buffer_start; |
| 865 |
int buffer_size;
|
| 866 |
int overlap, new_size, alloc_size;
|
| 867 |
|
| 868 |
if (s->write_flag)
|
| 869 |
return AVERROR(EINVAL);
|
| 870 |
|
| 871 |
buffer_size = s->buf_end - s->buffer; |
| 872 |
|
| 873 |
/* the buffers must touch or overlap */
|
| 874 |
if ((buffer_start = s->pos - buffer_size) > buf_size)
|
| 875 |
return AVERROR(EINVAL);
|
| 876 |
|
| 877 |
overlap = buf_size - buffer_start; |
| 878 |
new_size = buf_size + buffer_size - overlap; |
| 879 |
|
| 880 |
alloc_size = FFMAX(s->buffer_size, new_size); |
| 881 |
if (alloc_size > buf_size)
|
| 882 |
if (!(buf = av_realloc(buf, alloc_size)))
|
| 883 |
return AVERROR(ENOMEM);
|
| 884 |
|
| 885 |
if (new_size > buf_size) {
|
| 886 |
memcpy(buf + buf_size, s->buffer + overlap, buffer_size - overlap); |
| 887 |
buf_size = new_size; |
| 888 |
} |
| 889 |
|
| 890 |
av_free(s->buffer); |
| 891 |
s->buf_ptr = s->buffer = buf; |
| 892 |
s->buffer_size = alloc_size; |
| 893 |
s->pos = buf_size; |
| 894 |
s->buf_end = s->buf_ptr + buf_size; |
| 895 |
s->eof_reached = 0;
|
| 896 |
s->must_flush = 0;
|
| 897 |
|
| 898 |
return 0; |
| 899 |
} |
| 900 |
|
| 901 |
int avio_open(AVIOContext **s, const char *filename, int flags) |
| 902 |
{
|
| 903 |
URLContext *h; |
| 904 |
int err;
|
| 905 |
|
| 906 |
err = url_open(&h, filename, flags); |
| 907 |
if (err < 0) |
| 908 |
return err;
|
| 909 |
err = url_fdopen(s, h); |
| 910 |
if (err < 0) { |
| 911 |
url_close(h); |
| 912 |
return err;
|
| 913 |
} |
| 914 |
return 0; |
| 915 |
} |
| 916 |
|
| 917 |
int avio_close(AVIOContext *s)
|
| 918 |
{
|
| 919 |
URLContext *h = s->opaque; |
| 920 |
|
| 921 |
av_free(s->buffer); |
| 922 |
av_free(s); |
| 923 |
return url_close(h);
|
| 924 |
} |
| 925 |
|
| 926 |
URLContext *url_fileno(AVIOContext *s) |
| 927 |
{
|
| 928 |
return s->opaque;
|
| 929 |
} |
| 930 |
|
| 931 |
int avio_printf(AVIOContext *s, const char *fmt, ...) |
| 932 |
{
|
| 933 |
va_list ap; |
| 934 |
char buf[4096]; |
| 935 |
int ret;
|
| 936 |
|
| 937 |
va_start(ap, fmt); |
| 938 |
ret = vsnprintf(buf, sizeof(buf), fmt, ap);
|
| 939 |
va_end(ap); |
| 940 |
avio_write(s, buf, strlen(buf)); |
| 941 |
return ret;
|
| 942 |
} |
| 943 |
|
| 944 |
#if FF_API_OLD_AVIO
|
| 945 |
char *url_fgets(AVIOContext *s, char *buf, int buf_size) |
| 946 |
{
|
| 947 |
int c;
|
| 948 |
char *q;
|
| 949 |
|
| 950 |
c = avio_r8(s); |
| 951 |
if (s->eof_reached)
|
| 952 |
return NULL; |
| 953 |
q = buf; |
| 954 |
for(;;) {
|
| 955 |
if (s->eof_reached || c == '\n') |
| 956 |
break;
|
| 957 |
if ((q - buf) < buf_size - 1) |
| 958 |
*q++ = c; |
| 959 |
c = avio_r8(s); |
| 960 |
} |
| 961 |
if (buf_size > 0) |
| 962 |
*q = '\0';
|
| 963 |
return buf;
|
| 964 |
} |
| 965 |
|
| 966 |
int url_fget_max_packet_size(AVIOContext *s)
|
| 967 |
{
|
| 968 |
return s->max_packet_size;
|
| 969 |
} |
| 970 |
#endif
|
| 971 |
|
| 972 |
int av_url_read_fpause(AVIOContext *s, int pause) |
| 973 |
{
|
| 974 |
if (!s->read_pause)
|
| 975 |
return AVERROR(ENOSYS);
|
| 976 |
return s->read_pause(s->opaque, pause);
|
| 977 |
} |
| 978 |
|
| 979 |
int64_t av_url_read_fseek(AVIOContext *s, int stream_index,
|
| 980 |
int64_t timestamp, int flags)
|
| 981 |
{
|
| 982 |
URLContext *h = s->opaque; |
| 983 |
int64_t ret; |
| 984 |
if (!s->read_seek)
|
| 985 |
return AVERROR(ENOSYS);
|
| 986 |
ret = s->read_seek(h, stream_index, timestamp, flags); |
| 987 |
if(ret >= 0) { |
| 988 |
int64_t pos; |
| 989 |
s->buf_ptr = s->buf_end; // Flush buffer
|
| 990 |
pos = s->seek(h, 0, SEEK_CUR);
|
| 991 |
if (pos >= 0) |
| 992 |
s->pos = pos; |
| 993 |
else if (pos != AVERROR(ENOSYS)) |
| 994 |
ret = pos; |
| 995 |
} |
| 996 |
return ret;
|
| 997 |
} |
| 998 |
|
| 999 |
/* url_open_dyn_buf and url_close_dyn_buf are used in rtp.c to send a response
|
| 1000 |
* back to the server even if CONFIG_MUXERS is false. */
|
| 1001 |
#if CONFIG_MUXERS || CONFIG_NETWORK
|
| 1002 |
/* buffer handling */
|
| 1003 |
#if FF_API_OLD_AVIO
|
| 1004 |
int url_open_buf(AVIOContext **s, uint8_t *buf, int buf_size, int flags) |
| 1005 |
{
|
| 1006 |
int ret;
|
| 1007 |
*s = av_mallocz(sizeof(AVIOContext));
|
| 1008 |
if(!*s)
|
| 1009 |
return AVERROR(ENOMEM);
|
| 1010 |
ret = ffio_init_context(*s, buf, buf_size, |
| 1011 |
(flags & URL_WRONLY || flags & URL_RDWR), |
| 1012 |
NULL, NULL, NULL, NULL); |
| 1013 |
if(ret != 0) |
| 1014 |
av_freep(s); |
| 1015 |
return ret;
|
| 1016 |
} |
| 1017 |
|
| 1018 |
int url_close_buf(AVIOContext *s)
|
| 1019 |
{
|
| 1020 |
avio_flush(s); |
| 1021 |
return s->buf_ptr - s->buffer;
|
| 1022 |
} |
| 1023 |
#endif
|
| 1024 |
|
| 1025 |
/* output in a dynamic buffer */
|
| 1026 |
|
| 1027 |
typedef struct DynBuffer { |
| 1028 |
int pos, size, allocated_size;
|
| 1029 |
uint8_t *buffer; |
| 1030 |
int io_buffer_size;
|
| 1031 |
uint8_t io_buffer[1];
|
| 1032 |
} DynBuffer; |
| 1033 |
|
| 1034 |
static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size) |
| 1035 |
{
|
| 1036 |
DynBuffer *d = opaque; |
| 1037 |
unsigned new_size, new_allocated_size;
|
| 1038 |
|
| 1039 |
/* reallocate buffer if needed */
|
| 1040 |
new_size = d->pos + buf_size; |
| 1041 |
new_allocated_size = d->allocated_size; |
| 1042 |
if(new_size < d->pos || new_size > INT_MAX/2) |
| 1043 |
return -1; |
| 1044 |
while (new_size > new_allocated_size) {
|
| 1045 |
if (!new_allocated_size)
|
| 1046 |
new_allocated_size = new_size; |
| 1047 |
else
|
| 1048 |
new_allocated_size += new_allocated_size / 2 + 1; |
| 1049 |
} |
| 1050 |
|
| 1051 |
if (new_allocated_size > d->allocated_size) {
|
| 1052 |
d->buffer = av_realloc(d->buffer, new_allocated_size); |
| 1053 |
if(d->buffer == NULL) |
| 1054 |
return AVERROR(ENOMEM);
|
| 1055 |
d->allocated_size = new_allocated_size; |
| 1056 |
} |
| 1057 |
memcpy(d->buffer + d->pos, buf, buf_size); |
| 1058 |
d->pos = new_size; |
| 1059 |
if (d->pos > d->size)
|
| 1060 |
d->size = d->pos; |
| 1061 |
return buf_size;
|
| 1062 |
} |
| 1063 |
|
| 1064 |
static int dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size) |
| 1065 |
{
|
| 1066 |
unsigned char buf1[4]; |
| 1067 |
int ret;
|
| 1068 |
|
| 1069 |
/* packetized write: output the header */
|
| 1070 |
AV_WB32(buf1, buf_size); |
| 1071 |
ret= dyn_buf_write(opaque, buf1, 4);
|
| 1072 |
if(ret < 0) |
| 1073 |
return ret;
|
| 1074 |
|
| 1075 |
/* then the data */
|
| 1076 |
return dyn_buf_write(opaque, buf, buf_size);
|
| 1077 |
} |
| 1078 |
|
| 1079 |
static int64_t dyn_buf_seek(void *opaque, int64_t offset, int whence) |
| 1080 |
{
|
| 1081 |
DynBuffer *d = opaque; |
| 1082 |
|
| 1083 |
if (whence == SEEK_CUR)
|
| 1084 |
offset += d->pos; |
| 1085 |
else if (whence == SEEK_END) |
| 1086 |
offset += d->size; |
| 1087 |
if (offset < 0 || offset > 0x7fffffffLL) |
| 1088 |
return -1; |
| 1089 |
d->pos = offset; |
| 1090 |
return 0; |
| 1091 |
} |
| 1092 |
|
| 1093 |
static int url_open_dyn_buf_internal(AVIOContext **s, int max_packet_size) |
| 1094 |
{
|
| 1095 |
DynBuffer *d; |
| 1096 |
int ret;
|
| 1097 |
unsigned io_buffer_size = max_packet_size ? max_packet_size : 1024; |
| 1098 |
|
| 1099 |
if(sizeof(DynBuffer) + io_buffer_size < io_buffer_size) |
| 1100 |
return -1; |
| 1101 |
d = av_mallocz(sizeof(DynBuffer) + io_buffer_size);
|
| 1102 |
if (!d)
|
| 1103 |
return AVERROR(ENOMEM);
|
| 1104 |
*s = av_mallocz(sizeof(AVIOContext));
|
| 1105 |
if(!*s) {
|
| 1106 |
av_free(d); |
| 1107 |
return AVERROR(ENOMEM);
|
| 1108 |
} |
| 1109 |
d->io_buffer_size = io_buffer_size; |
| 1110 |
ret = ffio_init_context(*s, d->io_buffer, io_buffer_size, |
| 1111 |
1, d, NULL, |
| 1112 |
max_packet_size ? dyn_packet_buf_write : dyn_buf_write, |
| 1113 |
max_packet_size ? NULL : dyn_buf_seek);
|
| 1114 |
if (ret == 0) { |
| 1115 |
(*s)->max_packet_size = max_packet_size; |
| 1116 |
} else {
|
| 1117 |
av_free(d); |
| 1118 |
av_freep(s); |
| 1119 |
} |
| 1120 |
return ret;
|
| 1121 |
} |
| 1122 |
|
| 1123 |
int url_open_dyn_buf(AVIOContext **s)
|
| 1124 |
{
|
| 1125 |
return url_open_dyn_buf_internal(s, 0); |
| 1126 |
} |
| 1127 |
|
| 1128 |
int url_open_dyn_packet_buf(AVIOContext **s, int max_packet_size) |
| 1129 |
{
|
| 1130 |
if (max_packet_size <= 0) |
| 1131 |
return -1; |
| 1132 |
return url_open_dyn_buf_internal(s, max_packet_size);
|
| 1133 |
} |
| 1134 |
|
| 1135 |
int url_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
|
| 1136 |
{
|
| 1137 |
DynBuffer *d = s->opaque; |
| 1138 |
int size;
|
| 1139 |
static const char padbuf[FF_INPUT_BUFFER_PADDING_SIZE] = {0}; |
| 1140 |
int padding = 0; |
| 1141 |
|
| 1142 |
/* don't attempt to pad fixed-size packet buffers */
|
| 1143 |
if (!s->max_packet_size) {
|
| 1144 |
avio_write(s, padbuf, sizeof(padbuf));
|
| 1145 |
padding = FF_INPUT_BUFFER_PADDING_SIZE; |
| 1146 |
} |
| 1147 |
|
| 1148 |
avio_flush(s); |
| 1149 |
|
| 1150 |
*pbuffer = d->buffer; |
| 1151 |
size = d->size; |
| 1152 |
av_free(d); |
| 1153 |
av_free(s); |
| 1154 |
return size - padding;
|
| 1155 |
} |
| 1156 |
#endif /* CONFIG_MUXERS || CONFIG_NETWORK */ |