2 * Buffered I/O for ffmpeg system
3 * Copyright (c) 2000,2001 Fabrice Bellard
5 * This file is part of Libav.
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.
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.
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
22 #include "libavutil/crc.h"
23 #include "libavutil/intreadwrite.h"
26 #include "avio_internal.h"
31 #define IO_BUFFER_SIZE 32768
34 * Do seeks within this distance ahead of the current buffer by skipping
35 * data instead of calling the protocol seek function, for seekable
38 #define SHORT_SEEK_THRESHOLD 4096
40 static void fill_buffer(AVIOContext *s);
41 static int url_resetbuf(AVIOContext *s, int flags);
43 int ffio_init_context(AVIOContext *s,
44 unsigned char *buffer,
48 int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
49 int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
50 int64_t (*seek)(void *opaque, int64_t offset, int whence))
53 s->buffer_size = buffer_size;
56 url_resetbuf(s, write_flag ? AVIO_FLAG_WRITE : AVIO_FLAG_READ);
57 s->write_packet = write_packet;
58 s->read_packet = read_packet;
67 s->seekable = AVIO_SEEKABLE_NORMAL;
68 s->max_packet_size = 0;
69 s->update_checksum= NULL;
70 if(!read_packet && !write_flag){
72 s->buf_end = s->buffer + buffer_size;
80 int init_put_byte(AVIOContext *s,
81 unsigned char *buffer,
85 int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
86 int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
87 int64_t (*seek)(void *opaque, int64_t offset, int whence))
89 return ffio_init_context(s, buffer, buffer_size, write_flag, opaque,
90 read_packet, write_packet, seek);
92 AVIOContext *av_alloc_put_byte(
93 unsigned char *buffer,
97 int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
98 int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
99 int64_t (*seek)(void *opaque, int64_t offset, int whence))
101 return avio_alloc_context(buffer, buffer_size, write_flag, opaque,
102 read_packet, write_packet, seek);
106 AVIOContext *avio_alloc_context(
107 unsigned char *buffer,
111 int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
112 int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
113 int64_t (*seek)(void *opaque, int64_t offset, int whence))
115 AVIOContext *s = av_mallocz(sizeof(AVIOContext));
116 ffio_init_context(s, buffer, buffer_size, write_flag, opaque,
117 read_packet, write_packet, seek);
121 static void flush_buffer(AVIOContext *s)
123 if (s->buf_ptr > s->buffer) {
124 if (s->write_packet && !s->error){
125 int ret= s->write_packet(s->opaque, s->buffer, s->buf_ptr - s->buffer);
130 if(s->update_checksum){
131 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
132 s->checksum_ptr= s->buffer;
134 s->pos += s->buf_ptr - s->buffer;
136 s->buf_ptr = s->buffer;
139 void avio_w8(AVIOContext *s, int b)
142 if (s->buf_ptr >= s->buf_end)
146 void ffio_fill(AVIOContext *s, int b, int count)
149 int len = FFMIN(s->buf_end - s->buf_ptr, count);
150 memset(s->buf_ptr, b, len);
153 if (s->buf_ptr >= s->buf_end)
160 void avio_write(AVIOContext *s, const unsigned char *buf, int size)
163 int len = FFMIN(s->buf_end - s->buf_ptr, size);
164 memcpy(s->buf_ptr, buf, len);
167 if (s->buf_ptr >= s->buf_end)
175 void avio_flush(AVIOContext *s)
181 int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
185 int force = whence & AVSEEK_FORCE;
186 whence &= ~AVSEEK_FORCE;
189 return AVERROR(EINVAL);
191 pos = s->pos - (s->write_flag ? 0 : (s->buf_end - s->buffer));
193 if (whence != SEEK_CUR && whence != SEEK_SET)
194 return AVERROR(EINVAL);
196 if (whence == SEEK_CUR) {
197 offset1 = pos + (s->buf_ptr - s->buffer);
202 offset1 = offset - pos;
203 if (!s->must_flush &&
204 offset1 >= 0 && offset1 <= (s->buf_end - s->buffer)) {
205 /* can do the seek inside the buffer */
206 s->buf_ptr = s->buffer + offset1;
207 } else if ((!s->seekable ||
208 offset1 <= s->buf_end + SHORT_SEEK_THRESHOLD - s->buffer) &&
209 !s->write_flag && offset1 >= 0 &&
210 (whence != SEEK_END || force)) {
211 while(s->pos < offset && !s->eof_reached)
215 s->buf_ptr = s->buf_end + offset - s->pos;
219 #if CONFIG_MUXERS || CONFIG_NETWORK
224 #endif /* CONFIG_MUXERS || CONFIG_NETWORK */
226 return AVERROR(EPIPE);
227 if ((res = s->seek(s->opaque, offset, SEEK_SET)) < 0)
230 s->buf_end = s->buffer;
231 s->buf_ptr = s->buffer;
239 int url_fskip(AVIOContext *s, int64_t offset)
241 int64_t ret = avio_seek(s, offset, SEEK_CUR);
242 return ret < 0 ? ret : 0;
245 int64_t url_ftell(AVIOContext *s)
247 return avio_seek(s, 0, SEEK_CUR);
251 int64_t avio_size(AVIOContext *s)
256 return AVERROR(EINVAL);
259 return AVERROR(ENOSYS);
260 size = s->seek(s->opaque, 0, AVSEEK_SIZE);
262 if ((size = s->seek(s->opaque, -1, SEEK_END)) < 0)
265 s->seek(s->opaque, s->pos, SEEK_SET);
271 int url_feof(AVIOContext *s)
275 return s->eof_reached;
278 int url_ferror(AVIOContext *s)
286 void avio_wl32(AVIOContext *s, unsigned int val)
289 avio_w8(s, val >> 8);
290 avio_w8(s, val >> 16);
291 avio_w8(s, val >> 24);
294 void avio_wb32(AVIOContext *s, unsigned int val)
296 avio_w8(s, val >> 24);
297 avio_w8(s, val >> 16);
298 avio_w8(s, val >> 8);
303 void put_strz(AVIOContext *s, const char *str)
305 avio_put_str(s, str);
308 #define GET(name, type) \
309 type get_be ##name(AVIOContext *s) \
311 return avio_rb ##name(s);\
313 type get_le ##name(AVIOContext *s) \
315 return avio_rl ##name(s);\
318 GET(16, unsigned int)
319 GET(24, unsigned int)
320 GET(32, unsigned int)
325 #define PUT(name, type ) \
326 void put_le ##name(AVIOContext *s, type val)\
328 avio_wl ##name(s, val);\
330 void put_be ##name(AVIOContext *s, type val)\
332 avio_wb ##name(s, val);\
335 PUT(16, unsigned int)
336 PUT(24, unsigned int)
337 PUT(32, unsigned int)
341 int get_byte(AVIOContext *s)
345 int get_buffer(AVIOContext *s, unsigned char *buf, int size)
347 return avio_read(s, buf, size);
349 int get_partial_buffer(AVIOContext *s, unsigned char *buf, int size)
351 return ffio_read_partial(s, buf, size);
353 void put_byte(AVIOContext *s, int val)
357 void put_buffer(AVIOContext *s, const unsigned char *buf, int size)
359 avio_write(s, buf, size);
361 void put_nbyte(AVIOContext *s, int b, int count)
363 ffio_fill(s, b, count);
366 int url_fopen(AVIOContext **s, const char *filename, int flags)
368 return avio_open(s, filename, flags);
370 int url_fclose(AVIOContext *s)
372 return avio_close(s);
374 int64_t url_fseek(AVIOContext *s, int64_t offset, int whence)
376 return avio_seek(s, offset, whence);
378 int64_t url_fsize(AVIOContext *s)
382 int url_setbufsize(AVIOContext *s, int buf_size)
384 return ffio_set_buf_size(s, buf_size);
386 int url_fprintf(AVIOContext *s, const char *fmt, ...)
393 ret = vsnprintf(buf, sizeof(buf), fmt, ap);
395 avio_write(s, buf, strlen(buf));
398 void put_flush_packet(AVIOContext *s)
402 int av_url_read_fpause(AVIOContext *s, int pause)
404 return avio_pause(s, pause);
406 int64_t av_url_read_fseek(AVIOContext *s, int stream_index,
407 int64_t timestamp, int flags)
409 return avio_seek_time(s, stream_index, timestamp, flags);
411 void init_checksum(AVIOContext *s,
412 unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len),
413 unsigned long checksum)
415 ffio_init_checksum(s, update_checksum, checksum);
417 unsigned long get_checksum(AVIOContext *s)
419 return ffio_get_checksum(s);
421 int url_open_dyn_buf(AVIOContext **s)
423 return avio_open_dyn_buf(s);
425 int url_open_dyn_packet_buf(AVIOContext **s, int max_packet_size)
427 return ffio_open_dyn_packet_buf(s, max_packet_size);
429 int url_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
431 return avio_close_dyn_buf(s, pbuffer);
433 int url_fdopen(AVIOContext **s, URLContext *h)
435 return ffio_fdopen(s, h);
439 int avio_put_str(AVIOContext *s, const char *str)
444 avio_write(s, (const unsigned char *) str, len);
450 int avio_put_str16le(AVIOContext *s, const char *str)
452 const uint8_t *q = str;
459 GET_UTF8(ch, *q++, break;)
460 PUT_UTF16(ch, tmp, avio_wl16(s, tmp);ret += 2;)
467 int ff_get_v_length(uint64_t val){
476 void ff_put_v(AVIOContext *bc, uint64_t val){
477 int i= ff_get_v_length(val);
480 avio_w8(bc, 128 | (val>>(7*i)));
482 avio_w8(bc, val&127);
485 void avio_wl64(AVIOContext *s, uint64_t val)
487 avio_wl32(s, (uint32_t)(val & 0xffffffff));
488 avio_wl32(s, (uint32_t)(val >> 32));
491 void avio_wb64(AVIOContext *s, uint64_t val)
493 avio_wb32(s, (uint32_t)(val >> 32));
494 avio_wb32(s, (uint32_t)(val & 0xffffffff));
497 void avio_wl16(AVIOContext *s, unsigned int val)
500 avio_w8(s, val >> 8);
503 void avio_wb16(AVIOContext *s, unsigned int val)
505 avio_w8(s, val >> 8);
509 void avio_wl24(AVIOContext *s, unsigned int val)
511 avio_wl16(s, val & 0xffff);
512 avio_w8(s, val >> 16);
515 void avio_wb24(AVIOContext *s, unsigned int val)
517 avio_wb16(s, val >> 8);
522 void put_tag(AVIOContext *s, const char *tag)
532 static void fill_buffer(AVIOContext *s)
534 uint8_t *dst= !s->max_packet_size && s->buf_end - s->buffer < s->buffer_size ? s->buf_end : s->buffer;
535 int len= s->buffer_size - (dst - s->buffer);
536 int max_buffer_size = s->max_packet_size ? s->max_packet_size : IO_BUFFER_SIZE;
538 /* no need to do anything if EOF already reached */
542 if(s->update_checksum && dst == s->buffer){
543 if(s->buf_end > s->checksum_ptr)
544 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_end - s->checksum_ptr);
545 s->checksum_ptr= s->buffer;
548 /* make buffer smaller in case it ended up large after probing */
549 if (s->buffer_size > max_buffer_size) {
550 ffio_set_buf_size(s, max_buffer_size);
552 s->checksum_ptr = dst = s->buffer;
553 len = s->buffer_size;
557 len = s->read_packet(s->opaque, dst, len);
561 /* do not modify buffer if EOF reached so that a seek back can
562 be done without rereading data */
569 s->buf_end = dst + len;
573 unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf,
576 return av_crc(av_crc_get_table(AV_CRC_32_IEEE), checksum, buf, len);
579 unsigned long ffio_get_checksum(AVIOContext *s)
581 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
582 s->update_checksum= NULL;
586 void ffio_init_checksum(AVIOContext *s,
587 unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len),
588 unsigned long checksum)
590 s->update_checksum= update_checksum;
591 if(s->update_checksum){
592 s->checksum= checksum;
593 s->checksum_ptr= s->buf_ptr;
597 /* XXX: put an inline version */
598 int avio_r8(AVIOContext *s)
600 if (s->buf_ptr >= s->buf_end)
602 if (s->buf_ptr < s->buf_end)
603 return *s->buf_ptr++;
608 int url_fgetc(AVIOContext *s)
610 if (s->buf_ptr >= s->buf_end)
612 if (s->buf_ptr < s->buf_end)
613 return *s->buf_ptr++;
618 int avio_read(AVIOContext *s, unsigned char *buf, int size)
624 len = s->buf_end - s->buf_ptr;
628 if(size > s->buffer_size && !s->update_checksum){
630 len = s->read_packet(s->opaque, buf, size);
632 /* do not modify buffer if EOF reached so that a seek back can
633 be done without rereading data */
642 s->buf_ptr = s->buffer;
643 s->buf_end = s->buffer/* + len*/;
647 len = s->buf_end - s->buf_ptr;
652 memcpy(buf, s->buf_ptr, len);
659 if (s->error) return s->error;
660 if (s->eof_reached) return AVERROR_EOF;
665 int ffio_read_partial(AVIOContext *s, unsigned char *buf, int size)
672 len = s->buf_end - s->buf_ptr;
675 len = s->buf_end - s->buf_ptr;
679 memcpy(buf, s->buf_ptr, len);
682 if (s->error) return s->error;
683 if (s->eof_reached) return AVERROR_EOF;
688 unsigned int avio_rl16(AVIOContext *s)
692 val |= avio_r8(s) << 8;
696 unsigned int avio_rl24(AVIOContext *s)
700 val |= avio_r8(s) << 16;
704 unsigned int avio_rl32(AVIOContext *s)
708 val |= avio_rl16(s) << 16;
712 uint64_t avio_rl64(AVIOContext *s)
715 val = (uint64_t)avio_rl32(s);
716 val |= (uint64_t)avio_rl32(s) << 32;
720 unsigned int avio_rb16(AVIOContext *s)
723 val = avio_r8(s) << 8;
728 unsigned int avio_rb24(AVIOContext *s)
731 val = avio_rb16(s) << 8;
735 unsigned int avio_rb32(AVIOContext *s)
738 val = avio_rb16(s) << 16;
744 char *get_strz(AVIOContext *s, char *buf, int maxlen)
746 avio_get_str(s, INT_MAX, buf, maxlen);
751 int ff_get_line(AVIOContext *s, char *buf, int maxlen)
758 if (c && i < maxlen-1)
760 } while (c != '\n' && c);
766 int avio_get_str(AVIOContext *s, int maxlen, char *buf, int buflen)
770 // reserve 1 byte for terminating 0
771 buflen = FFMIN(buflen - 1, maxlen);
772 for (i = 0; i < buflen; i++)
773 if (!(buf[i] = avio_r8(s)))
777 for (; i < maxlen; i++)
783 #define GET_STR16(type, read) \
784 int avio_get_str16 ##type(AVIOContext *pb, int maxlen, char *buf, int buflen)\
788 while (ret + 1 < maxlen) {\
791 GET_UTF16(ch, (ret += 2) <= maxlen ? read(pb) : 0, break;)\
794 PUT_UTF8(ch, tmp, if (q - buf < buflen - 1) *q++ = tmp;)\
800 GET_STR16(le, avio_rl16)
801 GET_STR16(be, avio_rb16)
805 uint64_t avio_rb64(AVIOContext *s)
808 val = (uint64_t)avio_rb32(s) << 32;
809 val |= (uint64_t)avio_rb32(s);
813 uint64_t ffio_read_varlen(AVIOContext *bc){
819 val= (val<<7) + (tmp&127);
824 int ffio_fdopen(AVIOContext **s, URLContext *h)
827 int buffer_size, max_packet_size;
829 max_packet_size = h->max_packet_size;
830 if (max_packet_size) {
831 buffer_size = max_packet_size; /* no need to bufferize more than one packet */
833 buffer_size = IO_BUFFER_SIZE;
835 buffer = av_malloc(buffer_size);
837 return AVERROR(ENOMEM);
839 *s = av_mallocz(sizeof(AVIOContext));
842 return AVERROR(ENOMEM);
845 if (ffio_init_context(*s, buffer, buffer_size,
846 h->flags & AVIO_FLAG_WRITE, h,
847 ffurl_read, ffurl_write, ffurl_seek) < 0) {
853 (*s)->is_streamed = h->is_streamed;
855 (*s)->seekable = h->is_streamed ? 0 : AVIO_SEEKABLE_NORMAL;
856 (*s)->max_packet_size = max_packet_size;
858 (*s)->read_pause = (int (*)(void *, int))h->prot->url_read_pause;
859 (*s)->read_seek = (int64_t (*)(void *, int, int64_t, int))h->prot->url_read_seek;
864 int ffio_set_buf_size(AVIOContext *s, int buf_size)
867 buffer = av_malloc(buf_size);
869 return AVERROR(ENOMEM);
873 s->buffer_size = buf_size;
875 url_resetbuf(s, s->write_flag ? AVIO_FLAG_WRITE : AVIO_FLAG_READ);
879 static int url_resetbuf(AVIOContext *s, int flags)
881 assert(flags == AVIO_FLAG_WRITE || flags == AVIO_FLAG_READ);
883 if (flags & AVIO_FLAG_WRITE) {
884 s->buf_end = s->buffer + s->buffer_size;
887 s->buf_end = s->buffer;
893 int ffio_rewind_with_probe_data(AVIOContext *s, unsigned char *buf, int buf_size)
895 int64_t buffer_start;
897 int overlap, new_size, alloc_size;
900 return AVERROR(EINVAL);
902 buffer_size = s->buf_end - s->buffer;
904 /* the buffers must touch or overlap */
905 if ((buffer_start = s->pos - buffer_size) > buf_size)
906 return AVERROR(EINVAL);
908 overlap = buf_size - buffer_start;
909 new_size = buf_size + buffer_size - overlap;
911 alloc_size = FFMAX(s->buffer_size, new_size);
912 if (alloc_size > buf_size)
913 if (!(buf = av_realloc(buf, alloc_size)))
914 return AVERROR(ENOMEM);
916 if (new_size > buf_size) {
917 memcpy(buf + buf_size, s->buffer + overlap, buffer_size - overlap);
922 s->buf_ptr = s->buffer = buf;
923 s->buffer_size = alloc_size;
925 s->buf_end = s->buf_ptr + buf_size;
932 int avio_open(AVIOContext **s, const char *filename, int flags)
937 err = ffurl_open(&h, filename, flags);
940 err = ffio_fdopen(s, h);
948 int avio_close(AVIOContext *s)
950 URLContext *h = s->opaque;
954 return ffurl_close(h);
958 URLContext *url_fileno(AVIOContext *s)
964 int avio_printf(AVIOContext *s, const char *fmt, ...)
971 ret = vsnprintf(buf, sizeof(buf), fmt, ap);
973 avio_write(s, buf, strlen(buf));
978 char *url_fgets(AVIOContext *s, char *buf, int buf_size)
988 if (s->eof_reached || c == '\n')
990 if ((q - buf) < buf_size - 1)
999 int url_fget_max_packet_size(AVIOContext *s)
1001 return s->max_packet_size;
1005 int avio_pause(AVIOContext *s, int pause)
1008 return AVERROR(ENOSYS);
1009 return s->read_pause(s->opaque, pause);
1012 int64_t avio_seek_time(AVIOContext *s, int stream_index,
1013 int64_t timestamp, int flags)
1015 URLContext *h = s->opaque;
1018 return AVERROR(ENOSYS);
1019 ret = s->read_seek(h, stream_index, timestamp, flags);
1022 s->buf_ptr = s->buf_end; // Flush buffer
1023 pos = s->seek(h, 0, SEEK_CUR);
1026 else if (pos != AVERROR(ENOSYS))
1032 /* buffer handling */
1034 int url_open_buf(AVIOContext **s, uint8_t *buf, int buf_size, int flags)
1037 *s = av_mallocz(sizeof(AVIOContext));
1039 return AVERROR(ENOMEM);
1040 ret = ffio_init_context(*s, buf, buf_size,
1041 flags & AVIO_FLAG_WRITE,
1042 NULL, NULL, NULL, NULL);
1048 int url_close_buf(AVIOContext *s)
1051 return s->buf_ptr - s->buffer;
1055 /* output in a dynamic buffer */
1057 typedef struct DynBuffer {
1058 int pos, size, allocated_size;
1061 uint8_t io_buffer[1];
1064 static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size)
1066 DynBuffer *d = opaque;
1067 unsigned new_size, new_allocated_size;
1069 /* reallocate buffer if needed */
1070 new_size = d->pos + buf_size;
1071 new_allocated_size = d->allocated_size;
1072 if(new_size < d->pos || new_size > INT_MAX/2)
1074 while (new_size > new_allocated_size) {
1075 if (!new_allocated_size)
1076 new_allocated_size = new_size;
1078 new_allocated_size += new_allocated_size / 2 + 1;
1081 if (new_allocated_size > d->allocated_size) {
1082 d->buffer = av_realloc(d->buffer, new_allocated_size);
1083 if(d->buffer == NULL)
1084 return AVERROR(ENOMEM);
1085 d->allocated_size = new_allocated_size;
1087 memcpy(d->buffer + d->pos, buf, buf_size);
1089 if (d->pos > d->size)
1094 static int dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size)
1096 unsigned char buf1[4];
1099 /* packetized write: output the header */
1100 AV_WB32(buf1, buf_size);
1101 ret= dyn_buf_write(opaque, buf1, 4);
1106 return dyn_buf_write(opaque, buf, buf_size);
1109 static int64_t dyn_buf_seek(void *opaque, int64_t offset, int whence)
1111 DynBuffer *d = opaque;
1113 if (whence == SEEK_CUR)
1115 else if (whence == SEEK_END)
1117 if (offset < 0 || offset > 0x7fffffffLL)
1123 static int url_open_dyn_buf_internal(AVIOContext **s, int max_packet_size)
1126 unsigned io_buffer_size = max_packet_size ? max_packet_size : 1024;
1128 if(sizeof(DynBuffer) + io_buffer_size < io_buffer_size)
1130 d = av_mallocz(sizeof(DynBuffer) + io_buffer_size);
1132 return AVERROR(ENOMEM);
1133 d->io_buffer_size = io_buffer_size;
1134 *s = avio_alloc_context(d->io_buffer, d->io_buffer_size, 1, d, NULL,
1135 max_packet_size ? dyn_packet_buf_write : dyn_buf_write,
1136 max_packet_size ? NULL : dyn_buf_seek);
1139 return AVERROR(ENOMEM);
1141 (*s)->max_packet_size = max_packet_size;
1145 int avio_open_dyn_buf(AVIOContext **s)
1147 return url_open_dyn_buf_internal(s, 0);
1150 int ffio_open_dyn_packet_buf(AVIOContext **s, int max_packet_size)
1152 if (max_packet_size <= 0)
1154 return url_open_dyn_buf_internal(s, max_packet_size);
1157 int avio_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
1159 DynBuffer *d = s->opaque;
1161 static const char padbuf[FF_INPUT_BUFFER_PADDING_SIZE] = {0};
1164 /* don't attempt to pad fixed-size packet buffers */
1165 if (!s->max_packet_size) {
1166 avio_write(s, padbuf, sizeof(padbuf));
1167 padding = FF_INPUT_BUFFER_PADDING_SIZE;
1172 *pbuffer = d->buffer;
1176 return size - padding;