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"
30 #define IO_BUFFER_SIZE 32768
33 * Do seeks within this distance ahead of the current buffer by skipping
34 * data instead of calling the protocol seek function, for seekable
37 #define SHORT_SEEK_THRESHOLD 4096
39 static void fill_buffer(AVIOContext *s);
40 #if !FF_API_URL_RESETBUF
41 static int url_resetbuf(AVIOContext *s, int flags);
44 int ffio_init_context(AVIOContext *s,
45 unsigned char *buffer,
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))
54 s->buffer_size = buffer_size;
57 url_resetbuf(s, write_flag ? URL_WRONLY : URL_RDONLY);
58 s->write_packet = write_packet;
59 s->read_packet = read_packet;
68 s->seekable = AVIO_SEEKABLE_NORMAL;
69 s->max_packet_size = 0;
70 s->update_checksum= NULL;
71 if(!read_packet && !write_flag){
73 s->buf_end = s->buffer + buffer_size;
81 int init_put_byte(AVIOContext *s,
82 unsigned char *buffer,
86 int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
87 int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
88 int64_t (*seek)(void *opaque, int64_t offset, int whence))
90 return ffio_init_context(s, buffer, buffer_size, write_flag, opaque,
91 read_packet, write_packet, seek);
93 AVIOContext *av_alloc_put_byte(
94 unsigned char *buffer,
98 int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
99 int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
100 int64_t (*seek)(void *opaque, int64_t offset, int whence))
102 return avio_alloc_context(buffer, buffer_size, write_flag, opaque,
103 read_packet, write_packet, seek);
107 AVIOContext *avio_alloc_context(
108 unsigned char *buffer,
112 int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
113 int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
114 int64_t (*seek)(void *opaque, int64_t offset, int whence))
116 AVIOContext *s = av_mallocz(sizeof(AVIOContext));
117 ffio_init_context(s, buffer, buffer_size, write_flag, opaque,
118 read_packet, write_packet, seek);
122 static void flush_buffer(AVIOContext *s)
124 if (s->buf_ptr > s->buffer) {
125 if (s->write_packet && !s->error){
126 int ret= s->write_packet(s->opaque, s->buffer, s->buf_ptr - s->buffer);
131 if(s->update_checksum){
132 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
133 s->checksum_ptr= s->buffer;
135 s->pos += s->buf_ptr - s->buffer;
137 s->buf_ptr = s->buffer;
140 void avio_w8(AVIOContext *s, int b)
143 if (s->buf_ptr >= s->buf_end)
147 void ffio_fill(AVIOContext *s, int b, int count)
150 int len = FFMIN(s->buf_end - s->buf_ptr, count);
151 memset(s->buf_ptr, b, len);
154 if (s->buf_ptr >= s->buf_end)
161 void avio_write(AVIOContext *s, const unsigned char *buf, int size)
164 int len = FFMIN(s->buf_end - s->buf_ptr, size);
165 memcpy(s->buf_ptr, buf, len);
168 if (s->buf_ptr >= s->buf_end)
176 void avio_flush(AVIOContext *s)
182 int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
186 int force = whence & AVSEEK_FORCE;
187 whence &= ~AVSEEK_FORCE;
190 return AVERROR(EINVAL);
192 pos = s->pos - (s->write_flag ? 0 : (s->buf_end - s->buffer));
194 if (whence != SEEK_CUR && whence != SEEK_SET)
195 return AVERROR(EINVAL);
197 if (whence == SEEK_CUR) {
198 offset1 = pos + (s->buf_ptr - s->buffer);
203 offset1 = offset - pos;
204 if (!s->must_flush &&
205 offset1 >= 0 && offset1 <= (s->buf_end - s->buffer)) {
206 /* can do the seek inside the buffer */
207 s->buf_ptr = s->buffer + offset1;
208 } else if ((!s->seekable ||
209 offset1 <= s->buf_end + SHORT_SEEK_THRESHOLD - s->buffer) &&
210 !s->write_flag && offset1 >= 0 &&
211 (whence != SEEK_END || force)) {
212 while(s->pos < offset && !s->eof_reached)
216 s->buf_ptr = s->buf_end + offset - s->pos;
220 #if CONFIG_MUXERS || CONFIG_NETWORK
225 #endif /* CONFIG_MUXERS || CONFIG_NETWORK */
227 return AVERROR(EPIPE);
228 if ((res = s->seek(s->opaque, offset, SEEK_SET)) < 0)
231 s->buf_end = s->buffer;
232 s->buf_ptr = s->buffer;
240 int url_fskip(AVIOContext *s, int64_t offset)
242 int64_t ret = avio_seek(s, offset, SEEK_CUR);
243 return ret < 0 ? ret : 0;
246 int64_t url_ftell(AVIOContext *s)
248 return avio_seek(s, 0, SEEK_CUR);
252 int64_t avio_size(AVIOContext *s)
257 return AVERROR(EINVAL);
260 return AVERROR(ENOSYS);
261 size = s->seek(s->opaque, 0, AVSEEK_SIZE);
263 if ((size = s->seek(s->opaque, -1, SEEK_END)) < 0)
266 s->seek(s->opaque, s->pos, SEEK_SET);
272 int url_feof(AVIOContext *s)
276 return s->eof_reached;
279 int url_ferror(AVIOContext *s)
287 void avio_wl32(AVIOContext *s, unsigned int val)
290 avio_w8(s, val >> 8);
291 avio_w8(s, val >> 16);
292 avio_w8(s, val >> 24);
295 void avio_wb32(AVIOContext *s, unsigned int val)
297 avio_w8(s, val >> 24);
298 avio_w8(s, val >> 16);
299 avio_w8(s, val >> 8);
304 void put_strz(AVIOContext *s, const char *str)
306 avio_put_str(s, str);
309 #define GET(name, type) \
310 type get_be ##name(AVIOContext *s) \
312 return avio_rb ##name(s);\
314 type get_le ##name(AVIOContext *s) \
316 return avio_rl ##name(s);\
319 GET(16, unsigned int)
320 GET(24, unsigned int)
321 GET(32, unsigned int)
326 #define PUT(name, type ) \
327 void put_le ##name(AVIOContext *s, type val)\
329 avio_wl ##name(s, val);\
331 void put_be ##name(AVIOContext *s, type val)\
333 avio_wb ##name(s, val);\
336 PUT(16, unsigned int)
337 PUT(24, unsigned int)
338 PUT(32, unsigned int)
342 int get_byte(AVIOContext *s)
346 int get_buffer(AVIOContext *s, unsigned char *buf, int size)
348 return avio_read(s, buf, size);
350 int get_partial_buffer(AVIOContext *s, unsigned char *buf, int size)
352 return ffio_read_partial(s, buf, size);
354 void put_byte(AVIOContext *s, int val)
358 void put_buffer(AVIOContext *s, const unsigned char *buf, int size)
360 avio_write(s, buf, size);
362 void put_nbyte(AVIOContext *s, int b, int count)
364 ffio_fill(s, b, count);
367 int url_fopen(AVIOContext **s, const char *filename, int flags)
369 return avio_open(s, filename, flags);
371 int url_fclose(AVIOContext *s)
373 return avio_close(s);
375 int64_t url_fseek(AVIOContext *s, int64_t offset, int whence)
377 return avio_seek(s, offset, whence);
379 int64_t url_fsize(AVIOContext *s)
383 int url_setbufsize(AVIOContext *s, int buf_size)
385 return ffio_set_buf_size(s, buf_size);
387 int url_fprintf(AVIOContext *s, const char *fmt, ...)
394 ret = vsnprintf(buf, sizeof(buf), fmt, ap);
396 avio_write(s, buf, strlen(buf));
399 void put_flush_packet(AVIOContext *s)
403 int av_url_read_fpause(AVIOContext *s, int pause)
405 return ffio_read_pause(s, pause);
407 int64_t av_url_read_fseek(AVIOContext *s, int stream_index,
408 int64_t timestamp, int flags)
410 return ffio_read_seek(s, stream_index, timestamp, flags);
412 void init_checksum(AVIOContext *s,
413 unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len),
414 unsigned long checksum)
416 ffio_init_checksum(s, update_checksum, checksum);
418 unsigned long get_checksum(AVIOContext *s)
420 return ffio_get_checksum(s);
422 int url_open_dyn_buf(AVIOContext **s)
424 return avio_open_dyn_buf(s);
428 int avio_put_str(AVIOContext *s, const char *str)
433 avio_write(s, (const unsigned char *) str, len);
439 int avio_put_str16le(AVIOContext *s, const char *str)
441 const uint8_t *q = str;
448 GET_UTF8(ch, *q++, break;)
449 PUT_UTF16(ch, tmp, avio_wl16(s, tmp);ret += 2;)
456 int ff_get_v_length(uint64_t val){
465 void ff_put_v(AVIOContext *bc, uint64_t val){
466 int i= ff_get_v_length(val);
469 avio_w8(bc, 128 | (val>>(7*i)));
471 avio_w8(bc, val&127);
474 void avio_wl64(AVIOContext *s, uint64_t val)
476 avio_wl32(s, (uint32_t)(val & 0xffffffff));
477 avio_wl32(s, (uint32_t)(val >> 32));
480 void avio_wb64(AVIOContext *s, uint64_t val)
482 avio_wb32(s, (uint32_t)(val >> 32));
483 avio_wb32(s, (uint32_t)(val & 0xffffffff));
486 void avio_wl16(AVIOContext *s, unsigned int val)
489 avio_w8(s, val >> 8);
492 void avio_wb16(AVIOContext *s, unsigned int val)
494 avio_w8(s, val >> 8);
498 void avio_wl24(AVIOContext *s, unsigned int val)
500 avio_wl16(s, val & 0xffff);
501 avio_w8(s, val >> 16);
504 void avio_wb24(AVIOContext *s, unsigned int val)
506 avio_wb16(s, val >> 8);
511 void put_tag(AVIOContext *s, const char *tag)
521 static void fill_buffer(AVIOContext *s)
523 uint8_t *dst= !s->max_packet_size && s->buf_end - s->buffer < s->buffer_size ? s->buf_end : s->buffer;
524 int len= s->buffer_size - (dst - s->buffer);
525 int max_buffer_size = s->max_packet_size ? s->max_packet_size : IO_BUFFER_SIZE;
527 /* no need to do anything if EOF already reached */
531 if(s->update_checksum && dst == s->buffer){
532 if(s->buf_end > s->checksum_ptr)
533 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_end - s->checksum_ptr);
534 s->checksum_ptr= s->buffer;
537 /* make buffer smaller in case it ended up large after probing */
538 if (s->buffer_size > max_buffer_size) {
539 ffio_set_buf_size(s, max_buffer_size);
541 s->checksum_ptr = dst = s->buffer;
542 len = s->buffer_size;
546 len = s->read_packet(s->opaque, dst, len);
550 /* do not modify buffer if EOF reached so that a seek back can
551 be done without rereading data */
558 s->buf_end = dst + len;
562 unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf,
565 return av_crc(av_crc_get_table(AV_CRC_32_IEEE), checksum, buf, len);
568 unsigned long ffio_get_checksum(AVIOContext *s)
570 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
571 s->update_checksum= NULL;
575 void ffio_init_checksum(AVIOContext *s,
576 unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len),
577 unsigned long checksum)
579 s->update_checksum= update_checksum;
580 if(s->update_checksum){
581 s->checksum= checksum;
582 s->checksum_ptr= s->buf_ptr;
586 /* XXX: put an inline version */
587 int avio_r8(AVIOContext *s)
589 if (s->buf_ptr >= s->buf_end)
591 if (s->buf_ptr < s->buf_end)
592 return *s->buf_ptr++;
597 int url_fgetc(AVIOContext *s)
599 if (s->buf_ptr >= s->buf_end)
601 if (s->buf_ptr < s->buf_end)
602 return *s->buf_ptr++;
607 int avio_read(AVIOContext *s, unsigned char *buf, int size)
613 len = s->buf_end - s->buf_ptr;
617 if(size > s->buffer_size && !s->update_checksum){
619 len = s->read_packet(s->opaque, buf, size);
621 /* do not modify buffer if EOF reached so that a seek back can
622 be done without rereading data */
631 s->buf_ptr = s->buffer;
632 s->buf_end = s->buffer/* + len*/;
636 len = s->buf_end - s->buf_ptr;
641 memcpy(buf, s->buf_ptr, len);
648 if (s->error) return s->error;
649 if (s->eof_reached) return AVERROR_EOF;
654 int ffio_read_partial(AVIOContext *s, unsigned char *buf, int size)
661 len = s->buf_end - s->buf_ptr;
664 len = s->buf_end - s->buf_ptr;
668 memcpy(buf, s->buf_ptr, len);
671 if (s->error) return s->error;
672 if (s->eof_reached) return AVERROR_EOF;
677 unsigned int avio_rl16(AVIOContext *s)
681 val |= avio_r8(s) << 8;
685 unsigned int avio_rl24(AVIOContext *s)
689 val |= avio_r8(s) << 16;
693 unsigned int avio_rl32(AVIOContext *s)
697 val |= avio_rl16(s) << 16;
701 uint64_t avio_rl64(AVIOContext *s)
704 val = (uint64_t)avio_rl32(s);
705 val |= (uint64_t)avio_rl32(s) << 32;
709 unsigned int avio_rb16(AVIOContext *s)
712 val = avio_r8(s) << 8;
717 unsigned int avio_rb24(AVIOContext *s)
720 val = avio_rb16(s) << 8;
724 unsigned int avio_rb32(AVIOContext *s)
727 val = avio_rb16(s) << 16;
733 char *get_strz(AVIOContext *s, char *buf, int maxlen)
735 avio_get_str(s, INT_MAX, buf, maxlen);
740 int ff_get_line(AVIOContext *s, char *buf, int maxlen)
747 if (c && i < maxlen-1)
749 } while (c != '\n' && c);
755 int avio_get_str(AVIOContext *s, int maxlen, char *buf, int buflen)
759 // reserve 1 byte for terminating 0
760 buflen = FFMIN(buflen - 1, maxlen);
761 for (i = 0; i < buflen; i++)
762 if (!(buf[i] = avio_r8(s)))
766 for (; i < maxlen; i++)
772 #define GET_STR16(type, read) \
773 int avio_get_str16 ##type(AVIOContext *pb, int maxlen, char *buf, int buflen)\
777 while (ret + 1 < maxlen) {\
780 GET_UTF16(ch, (ret += 2) <= maxlen ? read(pb) : 0, break;)\
783 PUT_UTF8(ch, tmp, if (q - buf < buflen - 1) *q++ = tmp;)\
789 GET_STR16(le, avio_rl16)
790 GET_STR16(be, avio_rb16)
794 uint64_t avio_rb64(AVIOContext *s)
797 val = (uint64_t)avio_rb32(s) << 32;
798 val |= (uint64_t)avio_rb32(s);
802 uint64_t ffio_read_varlen(AVIOContext *bc){
808 val= (val<<7) + (tmp&127);
813 int url_fdopen(AVIOContext **s, URLContext *h)
816 int buffer_size, max_packet_size;
818 max_packet_size = url_get_max_packet_size(h);
819 if (max_packet_size) {
820 buffer_size = max_packet_size; /* no need to bufferize more than one packet */
822 buffer_size = IO_BUFFER_SIZE;
824 buffer = av_malloc(buffer_size);
826 return AVERROR(ENOMEM);
828 *s = av_mallocz(sizeof(AVIOContext));
831 return AVERROR(ENOMEM);
834 if (ffio_init_context(*s, buffer, buffer_size,
835 (h->flags & URL_WRONLY || h->flags & URL_RDWR), h,
836 url_read, url_write, url_seek) < 0) {
842 (*s)->is_streamed = h->is_streamed;
844 (*s)->seekable = h->is_streamed ? 0 : AVIO_SEEKABLE_NORMAL;
845 (*s)->max_packet_size = max_packet_size;
847 (*s)->read_pause = (int (*)(void *, int))h->prot->url_read_pause;
848 (*s)->read_seek = (int64_t (*)(void *, int, int64_t, int))h->prot->url_read_seek;
853 int ffio_set_buf_size(AVIOContext *s, int buf_size)
856 buffer = av_malloc(buf_size);
858 return AVERROR(ENOMEM);
862 s->buffer_size = buf_size;
864 url_resetbuf(s, s->write_flag ? URL_WRONLY : URL_RDONLY);
868 #if FF_API_URL_RESETBUF
869 int url_resetbuf(AVIOContext *s, int flags)
871 static int url_resetbuf(AVIOContext *s, int flags)
874 #if FF_API_URL_RESETBUF
875 if (flags & URL_RDWR)
876 return AVERROR(EINVAL);
878 assert(flags == URL_WRONLY || flags == URL_RDONLY);
881 if (flags & URL_WRONLY) {
882 s->buf_end = s->buffer + s->buffer_size;
885 s->buf_end = s->buffer;
891 int ffio_rewind_with_probe_data(AVIOContext *s, unsigned char *buf, int buf_size)
893 int64_t buffer_start;
895 int overlap, new_size, alloc_size;
898 return AVERROR(EINVAL);
900 buffer_size = s->buf_end - s->buffer;
902 /* the buffers must touch or overlap */
903 if ((buffer_start = s->pos - buffer_size) > buf_size)
904 return AVERROR(EINVAL);
906 overlap = buf_size - buffer_start;
907 new_size = buf_size + buffer_size - overlap;
909 alloc_size = FFMAX(s->buffer_size, new_size);
910 if (alloc_size > buf_size)
911 if (!(buf = av_realloc(buf, alloc_size)))
912 return AVERROR(ENOMEM);
914 if (new_size > buf_size) {
915 memcpy(buf + buf_size, s->buffer + overlap, buffer_size - overlap);
920 s->buf_ptr = s->buffer = buf;
921 s->buffer_size = alloc_size;
923 s->buf_end = s->buf_ptr + buf_size;
930 int avio_open(AVIOContext **s, const char *filename, int flags)
935 err = url_open(&h, filename, flags);
938 err = url_fdopen(s, h);
946 int avio_close(AVIOContext *s)
948 URLContext *h = s->opaque;
956 URLContext *url_fileno(AVIOContext *s)
962 int avio_printf(AVIOContext *s, const char *fmt, ...)
969 ret = vsnprintf(buf, sizeof(buf), fmt, ap);
971 avio_write(s, buf, strlen(buf));
976 char *url_fgets(AVIOContext *s, char *buf, int buf_size)
986 if (s->eof_reached || c == '\n')
988 if ((q - buf) < buf_size - 1)
997 int url_fget_max_packet_size(AVIOContext *s)
999 return s->max_packet_size;
1003 int ffio_read_pause(AVIOContext *s, int pause)
1006 return AVERROR(ENOSYS);
1007 return s->read_pause(s->opaque, pause);
1010 int64_t ffio_read_seek(AVIOContext *s, int stream_index,
1011 int64_t timestamp, int flags)
1013 URLContext *h = s->opaque;
1016 return AVERROR(ENOSYS);
1017 ret = s->read_seek(h, stream_index, timestamp, flags);
1020 s->buf_ptr = s->buf_end; // Flush buffer
1021 pos = s->seek(h, 0, SEEK_CUR);
1024 else if (pos != AVERROR(ENOSYS))
1030 /* avio_open_dyn_buf and url_close_dyn_buf are used in rtp.c to send a response
1031 * back to the server even if CONFIG_MUXERS is false. */
1032 #if CONFIG_MUXERS || CONFIG_NETWORK
1033 /* buffer handling */
1035 int url_open_buf(AVIOContext **s, uint8_t *buf, int buf_size, int flags)
1038 *s = av_mallocz(sizeof(AVIOContext));
1040 return AVERROR(ENOMEM);
1041 ret = ffio_init_context(*s, buf, buf_size,
1042 (flags & URL_WRONLY || flags & URL_RDWR),
1043 NULL, NULL, NULL, NULL);
1049 int url_close_buf(AVIOContext *s)
1052 return s->buf_ptr - s->buffer;
1056 /* output in a dynamic buffer */
1058 typedef struct DynBuffer {
1059 int pos, size, allocated_size;
1062 uint8_t io_buffer[1];
1065 static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size)
1067 DynBuffer *d = opaque;
1068 unsigned new_size, new_allocated_size;
1070 /* reallocate buffer if needed */
1071 new_size = d->pos + buf_size;
1072 new_allocated_size = d->allocated_size;
1073 if(new_size < d->pos || new_size > INT_MAX/2)
1075 while (new_size > new_allocated_size) {
1076 if (!new_allocated_size)
1077 new_allocated_size = new_size;
1079 new_allocated_size += new_allocated_size / 2 + 1;
1082 if (new_allocated_size > d->allocated_size) {
1083 d->buffer = av_realloc(d->buffer, new_allocated_size);
1084 if(d->buffer == NULL)
1085 return AVERROR(ENOMEM);
1086 d->allocated_size = new_allocated_size;
1088 memcpy(d->buffer + d->pos, buf, buf_size);
1090 if (d->pos > d->size)
1095 static int dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size)
1097 unsigned char buf1[4];
1100 /* packetized write: output the header */
1101 AV_WB32(buf1, buf_size);
1102 ret= dyn_buf_write(opaque, buf1, 4);
1107 return dyn_buf_write(opaque, buf, buf_size);
1110 static int64_t dyn_buf_seek(void *opaque, int64_t offset, int whence)
1112 DynBuffer *d = opaque;
1114 if (whence == SEEK_CUR)
1116 else if (whence == SEEK_END)
1118 if (offset < 0 || offset > 0x7fffffffLL)
1124 static int url_open_dyn_buf_internal(AVIOContext **s, int max_packet_size)
1128 unsigned io_buffer_size = max_packet_size ? max_packet_size : 1024;
1130 if(sizeof(DynBuffer) + io_buffer_size < io_buffer_size)
1132 d = av_mallocz(sizeof(DynBuffer) + io_buffer_size);
1134 return AVERROR(ENOMEM);
1135 *s = av_mallocz(sizeof(AVIOContext));
1138 return AVERROR(ENOMEM);
1140 d->io_buffer_size = io_buffer_size;
1141 ret = ffio_init_context(*s, d->io_buffer, io_buffer_size,
1143 max_packet_size ? dyn_packet_buf_write : dyn_buf_write,
1144 max_packet_size ? NULL : dyn_buf_seek);
1146 (*s)->max_packet_size = max_packet_size;
1154 int avio_open_dyn_buf(AVIOContext **s)
1156 return url_open_dyn_buf_internal(s, 0);
1159 int url_open_dyn_packet_buf(AVIOContext **s, int max_packet_size)
1161 if (max_packet_size <= 0)
1163 return url_open_dyn_buf_internal(s, max_packet_size);
1166 int url_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
1168 DynBuffer *d = s->opaque;
1170 static const char padbuf[FF_INPUT_BUFFER_PADDING_SIZE] = {0};
1173 /* don't attempt to pad fixed-size packet buffers */
1174 if (!s->max_packet_size) {
1175 avio_write(s, padbuf, sizeof(padbuf));
1176 padding = FF_INPUT_BUFFER_PADDING_SIZE;
1181 *pbuffer = d->buffer;
1185 return size - padding;
1187 #endif /* CONFIG_MUXERS || CONFIG_NETWORK */