2 * Buffered I/O for ffmpeg system
3 * Copyright (c) 2000,2001 Fabrice Bellard
5 * This file is part of FFmpeg.
7 * FFmpeg 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 * FFmpeg 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 FFmpeg; 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;
238 int64_t avio_skip(AVIOContext *s, int64_t offset)
240 return avio_seek(s, offset, SEEK_CUR);
244 int url_fskip(AVIOContext *s, int64_t offset)
246 int64_t ret = avio_seek(s, offset, SEEK_CUR);
247 return ret < 0 ? ret : 0;
250 int64_t url_ftell(AVIOContext *s)
252 return avio_seek(s, 0, SEEK_CUR);
256 int64_t avio_size(AVIOContext *s)
261 return AVERROR(EINVAL);
264 return AVERROR(ENOSYS);
265 size = s->seek(s->opaque, 0, AVSEEK_SIZE);
267 if ((size = s->seek(s->opaque, -1, SEEK_END)) < 0)
270 s->seek(s->opaque, s->pos, SEEK_SET);
275 int url_feof(AVIOContext *s)
283 return s->eof_reached;
287 int url_ferror(AVIOContext *s)
295 void avio_wl32(AVIOContext *s, unsigned int val)
298 avio_w8(s, val >> 8);
299 avio_w8(s, val >> 16);
300 avio_w8(s, val >> 24);
303 void avio_wb32(AVIOContext *s, unsigned int val)
305 avio_w8(s, val >> 24);
306 avio_w8(s, val >> 16);
307 avio_w8(s, val >> 8);
312 void put_strz(AVIOContext *s, const char *str)
314 avio_put_str(s, str);
317 #define GET(name, type) \
318 type get_be ##name(AVIOContext *s) \
320 return avio_rb ##name(s);\
322 type get_le ##name(AVIOContext *s) \
324 return avio_rl ##name(s);\
327 GET(16, unsigned int)
328 GET(24, unsigned int)
329 GET(32, unsigned int)
334 #define PUT(name, type ) \
335 void put_le ##name(AVIOContext *s, type val)\
337 avio_wl ##name(s, val);\
339 void put_be ##name(AVIOContext *s, type val)\
341 avio_wb ##name(s, val);\
344 PUT(16, unsigned int)
345 PUT(24, unsigned int)
346 PUT(32, unsigned int)
350 int get_byte(AVIOContext *s)
354 int get_buffer(AVIOContext *s, unsigned char *buf, int size)
356 return avio_read(s, buf, size);
358 int get_partial_buffer(AVIOContext *s, unsigned char *buf, int size)
360 return ffio_read_partial(s, buf, size);
362 void put_byte(AVIOContext *s, int val)
366 void put_buffer(AVIOContext *s, const unsigned char *buf, int size)
368 avio_write(s, buf, size);
370 void put_nbyte(AVIOContext *s, int b, int count)
372 ffio_fill(s, b, count);
375 int url_fopen(AVIOContext **s, const char *filename, int flags)
377 return avio_open(s, filename, flags);
379 int url_fclose(AVIOContext *s)
381 return avio_close(s);
383 int64_t url_fseek(AVIOContext *s, int64_t offset, int whence)
385 return avio_seek(s, offset, whence);
387 int64_t url_fsize(AVIOContext *s)
391 int url_setbufsize(AVIOContext *s, int buf_size)
393 return ffio_set_buf_size(s, buf_size);
395 int url_fprintf(AVIOContext *s, const char *fmt, ...)
402 ret = vsnprintf(buf, sizeof(buf), fmt, ap);
404 avio_write(s, buf, strlen(buf));
407 void put_flush_packet(AVIOContext *s)
411 int av_url_read_fpause(AVIOContext *s, int pause)
413 return avio_pause(s, pause);
415 int64_t av_url_read_fseek(AVIOContext *s, int stream_index,
416 int64_t timestamp, int flags)
418 return avio_seek_time(s, stream_index, timestamp, flags);
420 void init_checksum(AVIOContext *s,
421 unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len),
422 unsigned long checksum)
424 ffio_init_checksum(s, update_checksum, checksum);
426 unsigned long get_checksum(AVIOContext *s)
428 return ffio_get_checksum(s);
430 int url_open_dyn_buf(AVIOContext **s)
432 return avio_open_dyn_buf(s);
434 int url_open_dyn_packet_buf(AVIOContext **s, int max_packet_size)
436 return ffio_open_dyn_packet_buf(s, max_packet_size);
438 int url_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
440 return avio_close_dyn_buf(s, pbuffer);
442 int url_fdopen(AVIOContext **s, URLContext *h)
444 return ffio_fdopen(s, h);
448 int avio_put_str(AVIOContext *s, const char *str)
453 avio_write(s, (const unsigned char *) str, len);
459 int avio_put_str16le(AVIOContext *s, const char *str)
461 const uint8_t *q = str;
468 GET_UTF8(ch, *q++, break;)
469 PUT_UTF16(ch, tmp, avio_wl16(s, tmp);ret += 2;)
476 int ff_get_v_length(uint64_t val){
485 void ff_put_v(AVIOContext *bc, uint64_t val){
486 int i= ff_get_v_length(val);
489 avio_w8(bc, 128 | (val>>(7*i)));
491 avio_w8(bc, val&127);
494 void avio_wl64(AVIOContext *s, uint64_t val)
496 avio_wl32(s, (uint32_t)(val & 0xffffffff));
497 avio_wl32(s, (uint32_t)(val >> 32));
500 void avio_wb64(AVIOContext *s, uint64_t val)
502 avio_wb32(s, (uint32_t)(val >> 32));
503 avio_wb32(s, (uint32_t)(val & 0xffffffff));
506 void avio_wl16(AVIOContext *s, unsigned int val)
509 avio_w8(s, val >> 8);
512 void avio_wb16(AVIOContext *s, unsigned int val)
514 avio_w8(s, val >> 8);
518 void avio_wl24(AVIOContext *s, unsigned int val)
520 avio_wl16(s, val & 0xffff);
521 avio_w8(s, val >> 16);
524 void avio_wb24(AVIOContext *s, unsigned int val)
526 avio_wb16(s, val >> 8);
531 void put_tag(AVIOContext *s, const char *tag)
541 static void fill_buffer(AVIOContext *s)
543 uint8_t *dst= !s->max_packet_size && s->buf_end - s->buffer < s->buffer_size ? s->buf_end : s->buffer;
544 int len= s->buffer_size - (dst - s->buffer);
545 int max_buffer_size = s->max_packet_size ? s->max_packet_size : IO_BUFFER_SIZE;
547 /* no need to do anything if EOF already reached */
551 if(s->update_checksum && dst == s->buffer){
552 if(s->buf_end > s->checksum_ptr)
553 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_end - s->checksum_ptr);
554 s->checksum_ptr= s->buffer;
557 /* make buffer smaller in case it ended up large after probing */
558 if (s->read_packet && s->buffer_size > max_buffer_size) {
559 ffio_set_buf_size(s, max_buffer_size);
561 s->checksum_ptr = dst = s->buffer;
562 len = s->buffer_size;
566 len = s->read_packet(s->opaque, dst, len);
570 /* do not modify buffer if EOF reached so that a seek back can
571 be done without rereading data */
578 s->buf_end = dst + len;
582 unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf,
585 return av_crc(av_crc_get_table(AV_CRC_32_IEEE), checksum, buf, len);
588 unsigned long ffio_get_checksum(AVIOContext *s)
590 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
591 s->update_checksum= NULL;
595 void ffio_init_checksum(AVIOContext *s,
596 unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len),
597 unsigned long checksum)
599 s->update_checksum= update_checksum;
600 if(s->update_checksum){
601 s->checksum= checksum;
602 s->checksum_ptr= s->buf_ptr;
606 /* XXX: put an inline version */
607 int avio_r8(AVIOContext *s)
609 if (s->buf_ptr >= s->buf_end)
611 if (s->buf_ptr < s->buf_end)
612 return *s->buf_ptr++;
617 int url_fgetc(AVIOContext *s)
619 if (s->buf_ptr >= s->buf_end)
621 if (s->buf_ptr < s->buf_end)
622 return *s->buf_ptr++;
627 int avio_read(AVIOContext *s, unsigned char *buf, int size)
633 len = s->buf_end - s->buf_ptr;
637 if(size > s->buffer_size && !s->update_checksum){
639 len = s->read_packet(s->opaque, buf, size);
641 /* do not modify buffer if EOF reached so that a seek back can
642 be done without rereading data */
651 s->buf_ptr = s->buffer;
652 s->buf_end = s->buffer/* + len*/;
656 len = s->buf_end - s->buf_ptr;
661 memcpy(buf, s->buf_ptr, len);
668 if (s->error) return s->error;
669 if (url_feof(s)) return AVERROR_EOF;
674 int ffio_read_partial(AVIOContext *s, unsigned char *buf, int size)
681 len = s->buf_end - s->buf_ptr;
684 len = s->buf_end - s->buf_ptr;
688 memcpy(buf, s->buf_ptr, len);
691 if (s->error) return s->error;
692 if (url_feof(s)) return AVERROR_EOF;
697 unsigned int avio_rl16(AVIOContext *s)
701 val |= avio_r8(s) << 8;
705 unsigned int avio_rl24(AVIOContext *s)
709 val |= avio_r8(s) << 16;
713 unsigned int avio_rl32(AVIOContext *s)
717 val |= avio_rl16(s) << 16;
721 uint64_t avio_rl64(AVIOContext *s)
724 val = (uint64_t)avio_rl32(s);
725 val |= (uint64_t)avio_rl32(s) << 32;
729 unsigned int avio_rb16(AVIOContext *s)
732 val = avio_r8(s) << 8;
737 unsigned int avio_rb24(AVIOContext *s)
740 val = avio_rb16(s) << 8;
744 unsigned int avio_rb32(AVIOContext *s)
747 val = avio_rb16(s) << 16;
753 char *get_strz(AVIOContext *s, char *buf, int maxlen)
755 avio_get_str(s, INT_MAX, buf, maxlen);
760 int ff_get_line(AVIOContext *s, char *buf, int maxlen)
767 if (c && i < maxlen-1)
769 } while (c != '\n' && c);
775 int avio_get_str(AVIOContext *s, int maxlen, char *buf, int buflen)
779 // reserve 1 byte for terminating 0
780 buflen = FFMIN(buflen - 1, maxlen);
781 for (i = 0; i < buflen; i++)
782 if (!(buf[i] = avio_r8(s)))
786 for (; i < maxlen; i++)
792 #define GET_STR16(type, read) \
793 int avio_get_str16 ##type(AVIOContext *pb, int maxlen, char *buf, int buflen)\
797 while (ret + 1 < maxlen) {\
800 GET_UTF16(ch, (ret += 2) <= maxlen ? read(pb) : 0, break;)\
803 PUT_UTF8(ch, tmp, if (q - buf < buflen - 1) *q++ = tmp;)\
809 GET_STR16(le, avio_rl16)
810 GET_STR16(be, avio_rb16)
814 uint64_t avio_rb64(AVIOContext *s)
817 val = (uint64_t)avio_rb32(s) << 32;
818 val |= (uint64_t)avio_rb32(s);
822 uint64_t ffio_read_varlen(AVIOContext *bc){
828 val= (val<<7) + (tmp&127);
833 int ffio_fdopen(AVIOContext **s, URLContext *h)
836 int buffer_size, max_packet_size;
838 max_packet_size = h->max_packet_size;
839 if (max_packet_size) {
840 buffer_size = max_packet_size; /* no need to bufferize more than one packet */
842 buffer_size = IO_BUFFER_SIZE;
844 buffer = av_malloc(buffer_size);
846 return AVERROR(ENOMEM);
848 *s = av_mallocz(sizeof(AVIOContext));
851 return AVERROR(ENOMEM);
854 if (ffio_init_context(*s, buffer, buffer_size,
855 h->flags & AVIO_FLAG_WRITE, h,
856 (void*)ffurl_read, (void*)ffurl_write, (void*)ffurl_seek) < 0) {
862 (*s)->is_streamed = h->is_streamed;
864 (*s)->seekable = h->is_streamed ? 0 : AVIO_SEEKABLE_NORMAL;
865 (*s)->max_packet_size = max_packet_size;
867 (*s)->read_pause = (int (*)(void *, int))h->prot->url_read_pause;
868 (*s)->read_seek = (int64_t (*)(void *, int, int64_t, int))h->prot->url_read_seek;
873 int ffio_set_buf_size(AVIOContext *s, int buf_size)
876 buffer = av_malloc(buf_size);
878 return AVERROR(ENOMEM);
882 s->buffer_size = buf_size;
884 url_resetbuf(s, s->write_flag ? AVIO_FLAG_WRITE : AVIO_FLAG_READ);
888 static int url_resetbuf(AVIOContext *s, int flags)
890 assert(flags == AVIO_FLAG_WRITE || flags == AVIO_FLAG_READ);
892 if (flags & AVIO_FLAG_WRITE) {
893 s->buf_end = s->buffer + s->buffer_size;
896 s->buf_end = s->buffer;
902 int ffio_rewind_with_probe_data(AVIOContext *s, unsigned char *buf, int buf_size)
904 int64_t buffer_start;
906 int overlap, new_size, alloc_size;
909 return AVERROR(EINVAL);
911 buffer_size = s->buf_end - s->buffer;
913 /* the buffers must touch or overlap */
914 if ((buffer_start = s->pos - buffer_size) > buf_size)
915 return AVERROR(EINVAL);
917 overlap = buf_size - buffer_start;
918 new_size = buf_size + buffer_size - overlap;
920 alloc_size = FFMAX(s->buffer_size, new_size);
921 if (alloc_size > buf_size)
922 if (!(buf = av_realloc(buf, alloc_size)))
923 return AVERROR(ENOMEM);
925 if (new_size > buf_size) {
926 memcpy(buf + buf_size, s->buffer + overlap, buffer_size - overlap);
931 s->buf_ptr = s->buffer = buf;
932 s->buffer_size = alloc_size;
934 s->buf_end = s->buf_ptr + buf_size;
941 int avio_open(AVIOContext **s, const char *filename, int flags)
946 err = ffurl_open(&h, filename, flags);
949 err = ffio_fdopen(s, h);
957 int avio_close(AVIOContext *s)
959 URLContext *h = s->opaque;
963 return ffurl_close(h);
967 URLContext *url_fileno(AVIOContext *s)
973 int avio_printf(AVIOContext *s, const char *fmt, ...)
980 ret = vsnprintf(buf, sizeof(buf), fmt, ap);
982 avio_write(s, buf, strlen(buf));
987 char *url_fgets(AVIOContext *s, char *buf, int buf_size)
997 if (url_feof(s) || c == '\n')
999 if ((q - buf) < buf_size - 1)
1008 int url_fget_max_packet_size(AVIOContext *s)
1010 return s->max_packet_size;
1014 int avio_pause(AVIOContext *s, int pause)
1017 return AVERROR(ENOSYS);
1018 return s->read_pause(s->opaque, pause);
1021 int64_t avio_seek_time(AVIOContext *s, int stream_index,
1022 int64_t timestamp, int flags)
1024 URLContext *h = s->opaque;
1027 return AVERROR(ENOSYS);
1028 ret = s->read_seek(h, stream_index, timestamp, flags);
1031 s->buf_ptr = s->buf_end; // Flush buffer
1032 pos = s->seek(h, 0, SEEK_CUR);
1035 else if (pos != AVERROR(ENOSYS))
1041 /* buffer handling */
1043 int url_open_buf(AVIOContext **s, uint8_t *buf, int buf_size, int flags)
1046 *s = av_mallocz(sizeof(AVIOContext));
1048 return AVERROR(ENOMEM);
1049 ret = ffio_init_context(*s, buf, buf_size,
1050 flags & AVIO_FLAG_WRITE,
1051 NULL, NULL, NULL, NULL);
1057 int url_close_buf(AVIOContext *s)
1060 return s->buf_ptr - s->buffer;
1064 /* output in a dynamic buffer */
1066 typedef struct DynBuffer {
1067 int pos, size, allocated_size;
1070 uint8_t io_buffer[1];
1073 static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size)
1075 DynBuffer *d = opaque;
1076 unsigned new_size, new_allocated_size;
1078 /* reallocate buffer if needed */
1079 new_size = d->pos + buf_size;
1080 new_allocated_size = d->allocated_size;
1081 if(new_size < d->pos || new_size > INT_MAX/2)
1083 while (new_size > new_allocated_size) {
1084 if (!new_allocated_size)
1085 new_allocated_size = new_size;
1087 new_allocated_size += new_allocated_size / 2 + 1;
1090 if (new_allocated_size > d->allocated_size) {
1091 d->buffer = av_realloc(d->buffer, new_allocated_size);
1092 if(d->buffer == NULL)
1093 return AVERROR(ENOMEM);
1094 d->allocated_size = new_allocated_size;
1096 memcpy(d->buffer + d->pos, buf, buf_size);
1098 if (d->pos > d->size)
1103 static int dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size)
1105 unsigned char buf1[4];
1108 /* packetized write: output the header */
1109 AV_WB32(buf1, buf_size);
1110 ret= dyn_buf_write(opaque, buf1, 4);
1115 return dyn_buf_write(opaque, buf, buf_size);
1118 static int64_t dyn_buf_seek(void *opaque, int64_t offset, int whence)
1120 DynBuffer *d = opaque;
1122 if (whence == SEEK_CUR)
1124 else if (whence == SEEK_END)
1126 if (offset < 0 || offset > 0x7fffffffLL)
1132 static int url_open_dyn_buf_internal(AVIOContext **s, int max_packet_size)
1135 unsigned io_buffer_size = max_packet_size ? max_packet_size : 1024;
1137 if(sizeof(DynBuffer) + io_buffer_size < io_buffer_size)
1139 d = av_mallocz(sizeof(DynBuffer) + io_buffer_size);
1141 return AVERROR(ENOMEM);
1142 d->io_buffer_size = io_buffer_size;
1143 *s = avio_alloc_context(d->io_buffer, d->io_buffer_size, 1, d, NULL,
1144 max_packet_size ? dyn_packet_buf_write : dyn_buf_write,
1145 max_packet_size ? NULL : dyn_buf_seek);
1148 return AVERROR(ENOMEM);
1150 (*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 ffio_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 avio_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;