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/bprint.h"
23 #include "libavutil/crc.h"
24 #include "libavutil/dict.h"
25 #include "libavutil/intreadwrite.h"
26 #include "libavutil/log.h"
27 #include "libavutil/opt.h"
28 #include "libavutil/avassert.h"
31 #include "avio_internal.h"
36 #define IO_BUFFER_SIZE 32768
39 * Do seeks within this distance ahead of the current buffer by skipping
40 * data instead of calling the protocol seek function, for seekable
43 #define SHORT_SEEK_THRESHOLD 4096
45 typedef struct AVIOInternal {
49 static void *ff_avio_child_next(void *obj, void *prev)
52 AVIOInternal *internal = s->opaque;
53 return prev ? NULL : internal->h;
56 static const AVClass *ff_avio_child_class_next(const AVClass *prev)
58 return prev ? NULL : &ffurl_context_class;
61 #define OFFSET(x) offsetof(AVIOContext,x)
62 #define E AV_OPT_FLAG_ENCODING_PARAM
63 #define D AV_OPT_FLAG_DECODING_PARAM
64 static const AVOption ff_avio_options[] = {
65 {"protocol_whitelist", "List of protocols that are allowed to be used", OFFSET(protocol_whitelist), AV_OPT_TYPE_STRING, { .str = NULL }, CHAR_MIN, CHAR_MAX, D },
69 const AVClass ff_avio_class = {
70 .class_name = "AVIOContext",
71 .item_name = av_default_item_name,
72 .version = LIBAVUTIL_VERSION_INT,
73 .option = ff_avio_options,
74 .child_next = ff_avio_child_next,
75 .child_class_next = ff_avio_child_class_next,
78 static void fill_buffer(AVIOContext *s);
79 static int url_resetbuf(AVIOContext *s, int flags);
81 int ffio_init_context(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))
92 s->buffer_size = buffer_size;
97 url_resetbuf(s, write_flag ? AVIO_FLAG_WRITE : AVIO_FLAG_READ);
99 s->write_packet = write_packet;
100 s->read_packet = read_packet;
106 s->seekable = seek ? AVIO_SEEKABLE_NORMAL : 0;
107 s->max_packet_size = 0;
108 s->update_checksum = NULL;
109 s->short_seek_threshold = SHORT_SEEK_THRESHOLD;
111 if (!read_packet && !write_flag) {
112 s->pos = buffer_size;
113 s->buf_end = s->buffer + buffer_size;
115 s->read_pause = NULL;
121 AVIOContext *avio_alloc_context(
122 unsigned char *buffer,
126 int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
127 int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
128 int64_t (*seek)(void *opaque, int64_t offset, int whence))
130 AVIOContext *s = av_mallocz(sizeof(AVIOContext));
133 ffio_init_context(s, buffer, buffer_size, write_flag, opaque,
134 read_packet, write_packet, seek);
138 static void writeout(AVIOContext *s, const uint8_t *data, int len)
140 if (s->write_packet && !s->error) {
141 int ret = s->write_packet(s->opaque, (uint8_t *)data, len);
146 s->writeout_count ++;
150 static void flush_buffer(AVIOContext *s)
152 if (s->write_flag && s->buf_ptr > s->buffer) {
153 writeout(s, s->buffer, s->buf_ptr - s->buffer);
154 if (s->update_checksum) {
155 s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
156 s->buf_ptr - s->checksum_ptr);
157 s->checksum_ptr = s->buffer;
160 s->buf_ptr = s->buffer;
162 s->buf_end = s->buffer;
165 void avio_w8(AVIOContext *s, int b)
167 av_assert2(b>=-128 && b<=255);
169 if (s->buf_ptr >= s->buf_end)
173 void ffio_fill(AVIOContext *s, int b, int count)
176 int len = FFMIN(s->buf_end - s->buf_ptr, count);
177 memset(s->buf_ptr, b, len);
180 if (s->buf_ptr >= s->buf_end)
187 void avio_write(AVIOContext *s, const unsigned char *buf, int size)
189 if (s->direct && !s->update_checksum) {
191 writeout(s, buf, size);
195 int len = FFMIN(s->buf_end - s->buf_ptr, size);
196 memcpy(s->buf_ptr, buf, len);
199 if (s->buf_ptr >= s->buf_end)
207 void avio_flush(AVIOContext *s)
213 int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
217 int force = whence & AVSEEK_FORCE;
219 whence &= ~AVSEEK_FORCE;
222 return AVERROR(EINVAL);
224 buffer_size = s->buf_end - s->buffer;
225 // pos is the absolute position that the beginning of s->buffer corresponds to in the file
226 pos = s->pos - (s->write_flag ? 0 : buffer_size);
228 if (whence != SEEK_CUR && whence != SEEK_SET)
229 return AVERROR(EINVAL);
231 if (whence == SEEK_CUR) {
232 offset1 = pos + (s->buf_ptr - s->buffer);
238 return AVERROR(EINVAL);
240 offset1 = offset - pos; // "offset1" is the relative offset from the beginning of s->buffer
241 if (!s->must_flush && (!s->direct || !s->seek) &&
242 offset1 >= 0 && offset1 <= buffer_size - s->write_flag) {
243 /* can do the seek inside the buffer */
244 s->buf_ptr = s->buffer + offset1;
245 } else if ((!s->seekable ||
246 offset1 <= buffer_size + s->short_seek_threshold) &&
247 !s->write_flag && offset1 >= 0 &&
248 (!s->direct || !s->seek) &&
249 (whence != SEEK_END || force)) {
250 while(s->pos < offset && !s->eof_reached)
254 s->buf_ptr = s->buf_end - (s->pos - offset);
255 } else if(!s->write_flag && offset1 < 0 && -offset1 < buffer_size>>1 && s->seek && offset > 0) {
258 pos -= FFMIN(buffer_size>>1, pos);
259 if ((res = s->seek(s->opaque, pos, SEEK_SET)) < 0)
262 s->buf_ptr = s->buffer;
266 return avio_seek(s, offset, SEEK_SET | force);
274 return AVERROR(EPIPE);
275 if ((res = s->seek(s->opaque, offset, SEEK_SET)) < 0)
279 s->buf_end = s->buffer;
280 s->buf_ptr = s->buffer;
287 int64_t avio_skip(AVIOContext *s, int64_t offset)
289 return avio_seek(s, offset, SEEK_CUR);
292 int64_t avio_size(AVIOContext *s)
297 return AVERROR(EINVAL);
300 return AVERROR(ENOSYS);
301 size = s->seek(s->opaque, 0, AVSEEK_SIZE);
303 if ((size = s->seek(s->opaque, -1, SEEK_END)) < 0)
306 s->seek(s->opaque, s->pos, SEEK_SET);
311 int avio_feof(AVIOContext *s)
319 return s->eof_reached;
323 int url_feof(AVIOContext *s)
329 void avio_wl32(AVIOContext *s, unsigned int val)
331 avio_w8(s, (uint8_t) val );
332 avio_w8(s, (uint8_t)(val >> 8 ));
333 avio_w8(s, (uint8_t)(val >> 16));
334 avio_w8(s, val >> 24 );
337 void avio_wb32(AVIOContext *s, unsigned int val)
339 avio_w8(s, val >> 24 );
340 avio_w8(s, (uint8_t)(val >> 16));
341 avio_w8(s, (uint8_t)(val >> 8 ));
342 avio_w8(s, (uint8_t) val );
345 int avio_put_str(AVIOContext *s, const char *str)
350 avio_write(s, (const unsigned char *) str, len);
356 static inline int put_str16(AVIOContext *s, const char *str, const int be)
358 const uint8_t *q = str;
366 GET_UTF8(ch, *q++, goto invalid;)
367 PUT_UTF16(ch, tmp, be ? avio_wb16(s, tmp) : avio_wl16(s, tmp);
371 av_log(s, AV_LOG_ERROR, "Invaid UTF8 sequence in avio_put_str16%s\n", be ? "be" : "le");
372 err = AVERROR(EINVAL);
386 #define PUT_STR16(type, big_endian) \
387 int avio_put_str16 ## type(AVIOContext *s, const char *str) \
389 return put_str16(s, str, big_endian); \
397 int ff_get_v_length(uint64_t val)
407 void ff_put_v(AVIOContext *bc, uint64_t val)
409 int i = ff_get_v_length(val);
412 avio_w8(bc, 128 | (uint8_t)(val >> (7*i)));
414 avio_w8(bc, val & 127);
417 void avio_wl64(AVIOContext *s, uint64_t val)
419 avio_wl32(s, (uint32_t)(val & 0xffffffff));
420 avio_wl32(s, (uint32_t)(val >> 32));
423 void avio_wb64(AVIOContext *s, uint64_t val)
425 avio_wb32(s, (uint32_t)(val >> 32));
426 avio_wb32(s, (uint32_t)(val & 0xffffffff));
429 void avio_wl16(AVIOContext *s, unsigned int val)
431 avio_w8(s, (uint8_t)val);
432 avio_w8(s, (int)val >> 8);
435 void avio_wb16(AVIOContext *s, unsigned int val)
437 avio_w8(s, (int)val >> 8);
438 avio_w8(s, (uint8_t)val);
441 void avio_wl24(AVIOContext *s, unsigned int val)
443 avio_wl16(s, val & 0xffff);
444 avio_w8(s, (int)val >> 16);
447 void avio_wb24(AVIOContext *s, unsigned int val)
449 avio_wb16(s, (int)val >> 8);
450 avio_w8(s, (uint8_t)val);
455 static void fill_buffer(AVIOContext *s)
457 int max_buffer_size = s->max_packet_size ?
458 s->max_packet_size : IO_BUFFER_SIZE;
459 uint8_t *dst = s->buf_end - s->buffer + max_buffer_size < s->buffer_size ?
460 s->buf_end : s->buffer;
461 int len = s->buffer_size - (dst - s->buffer);
463 /* can't fill the buffer without read_packet, just set EOF if appropriate */
464 if (!s->read_packet && s->buf_ptr >= s->buf_end)
467 /* no need to do anything if EOF already reached */
471 if (s->update_checksum && dst == s->buffer) {
472 if (s->buf_end > s->checksum_ptr)
473 s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
474 s->buf_end - s->checksum_ptr);
475 s->checksum_ptr = s->buffer;
478 /* make buffer smaller in case it ended up large after probing */
479 if (s->read_packet && s->orig_buffer_size && s->buffer_size > s->orig_buffer_size) {
480 if (dst == s->buffer) {
481 int ret = ffio_set_buf_size(s, s->orig_buffer_size);
483 av_log(s, AV_LOG_WARNING, "Failed to decrease buffer size\n");
485 s->checksum_ptr = dst = s->buffer;
487 av_assert0(len >= s->orig_buffer_size);
488 len = s->orig_buffer_size;
492 len = s->read_packet(s->opaque, dst, len);
496 /* do not modify buffer if EOF reached so that a seek back can
497 be done without rereading data */
504 s->buf_end = dst + len;
505 s->bytes_read += len;
509 unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf,
512 return av_crc(av_crc_get_table(AV_CRC_32_IEEE), checksum, buf, len);
515 unsigned long ff_crcA001_update(unsigned long checksum, const uint8_t *buf,
518 return av_crc(av_crc_get_table(AV_CRC_16_ANSI_LE), checksum, buf, len);
521 unsigned long ffio_get_checksum(AVIOContext *s)
523 s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
524 s->buf_ptr - s->checksum_ptr);
525 s->update_checksum = NULL;
529 void ffio_init_checksum(AVIOContext *s,
530 unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len),
531 unsigned long checksum)
533 s->update_checksum = update_checksum;
534 if (s->update_checksum) {
535 s->checksum = checksum;
536 s->checksum_ptr = s->buf_ptr;
540 /* XXX: put an inline version */
541 int avio_r8(AVIOContext *s)
543 if (s->buf_ptr >= s->buf_end)
545 if (s->buf_ptr < s->buf_end)
546 return *s->buf_ptr++;
550 int avio_read(AVIOContext *s, unsigned char *buf, int size)
556 len = FFMIN(s->buf_end - s->buf_ptr, size);
557 if (len == 0 || s->write_flag) {
558 if((s->direct || size > s->buffer_size) && !s->update_checksum) {
559 // bypass the buffer and read data directly into buf
561 len = s->read_packet(s->opaque, buf, size);
564 /* do not modify buffer if EOF reached so that a seek back can
565 be done without rereading data */
572 s->bytes_read += len;
576 s->buf_ptr = s->buffer;
577 s->buf_end = s->buffer/* + len*/;
581 len = s->buf_end - s->buf_ptr;
586 memcpy(buf, s->buf_ptr, len);
593 if (s->error) return s->error;
594 if (avio_feof(s)) return AVERROR_EOF;
599 int ffio_read_size(AVIOContext *s, unsigned char *buf, int size)
601 int ret = avio_read(s, buf, size);
603 return AVERROR_INVALIDDATA;
607 int ffio_read_indirect(AVIOContext *s, unsigned char *buf, int size, const unsigned char **data)
609 if (s->buf_end - s->buf_ptr >= size && !s->write_flag) {
615 return avio_read(s, buf, size);
619 int ffio_read_partial(AVIOContext *s, unsigned char *buf, int size)
626 if (s->read_packet && s->write_flag) {
627 len = s->read_packet(s->opaque, buf, size);
633 len = s->buf_end - s->buf_ptr;
635 /* Reset the buf_end pointer to the start of the buffer, to make sure
636 * the fill_buffer call tries to read as much data as fits into the
637 * full buffer, instead of just what space is left after buf_end.
638 * This avoids returning partial packets at the end of the buffer,
639 * for packet based inputs.
641 s->buf_end = s->buf_ptr = s->buffer;
643 len = s->buf_end - s->buf_ptr;
647 memcpy(buf, s->buf_ptr, len);
650 if (s->error) return s->error;
651 if (avio_feof(s)) return AVERROR_EOF;
656 unsigned int avio_rl16(AVIOContext *s)
660 val |= avio_r8(s) << 8;
664 unsigned int avio_rl24(AVIOContext *s)
668 val |= avio_r8(s) << 16;
672 unsigned int avio_rl32(AVIOContext *s)
676 val |= avio_rl16(s) << 16;
680 uint64_t avio_rl64(AVIOContext *s)
683 val = (uint64_t)avio_rl32(s);
684 val |= (uint64_t)avio_rl32(s) << 32;
688 unsigned int avio_rb16(AVIOContext *s)
691 val = avio_r8(s) << 8;
696 unsigned int avio_rb24(AVIOContext *s)
699 val = avio_rb16(s) << 8;
703 unsigned int avio_rb32(AVIOContext *s)
706 val = avio_rb16(s) << 16;
711 int ff_get_line(AVIOContext *s, char *buf, int maxlen)
718 if (c && i < maxlen-1)
720 } while (c != '\n' && c != '\r' && c);
721 if (c == '\r' && avio_r8(s) != '\n' && !avio_feof(s))
728 int avio_get_str(AVIOContext *s, int maxlen, char *buf, int buflen)
733 return AVERROR(EINVAL);
734 // reserve 1 byte for terminating 0
735 buflen = FFMIN(buflen - 1, maxlen);
736 for (i = 0; i < buflen; i++)
737 if (!(buf[i] = avio_r8(s)))
740 for (; i < maxlen; i++)
746 #define GET_STR16(type, read) \
747 int avio_get_str16 ##type(AVIOContext *pb, int maxlen, char *buf, int buflen)\
752 return AVERROR(EINVAL); \
753 while (ret + 1 < maxlen) {\
756 GET_UTF16(ch, (ret += 2) <= maxlen ? read(pb) : 0, break;)\
759 PUT_UTF8(ch, tmp, if (q - buf < buflen - 1) *q++ = tmp;)\
765 GET_STR16(le, avio_rl16)
766 GET_STR16(be, avio_rb16)
770 uint64_t avio_rb64(AVIOContext *s)
773 val = (uint64_t)avio_rb32(s) << 32;
774 val |= (uint64_t)avio_rb32(s);
778 uint64_t ffio_read_varlen(AVIOContext *bc){
784 val= (val<<7) + (tmp&127);
789 static int io_read_packet(void *opaque, uint8_t *buf, int buf_size)
791 AVIOInternal *internal = opaque;
792 return ffurl_read(internal->h, buf, buf_size);
795 static int io_write_packet(void *opaque, uint8_t *buf, int buf_size)
797 AVIOInternal *internal = opaque;
798 return ffurl_write(internal->h, buf, buf_size);
801 static int64_t io_seek(void *opaque, int64_t offset, int whence)
803 AVIOInternal *internal = opaque;
804 return ffurl_seek(internal->h, offset, whence);
807 static int io_read_pause(void *opaque, int pause)
809 AVIOInternal *internal = opaque;
810 if (!internal->h->prot->url_read_pause)
811 return AVERROR(ENOSYS);
812 return internal->h->prot->url_read_pause(internal->h, pause);
815 static int64_t io_read_seek(void *opaque, int stream_index, int64_t timestamp, int flags)
817 AVIOInternal *internal = opaque;
818 if (!internal->h->prot->url_read_seek)
819 return AVERROR(ENOSYS);
820 return internal->h->prot->url_read_seek(internal->h, stream_index, timestamp, flags);
823 int ffio_fdopen(AVIOContext **s, URLContext *h)
825 AVIOInternal *internal = NULL;
826 uint8_t *buffer = NULL;
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 internal = av_mallocz(sizeof(*internal));
845 *s = avio_alloc_context(buffer, buffer_size, h->flags & AVIO_FLAG_WRITE,
846 internal, io_read_packet, io_write_packet, io_seek);
850 (*s)->protocol_whitelist = av_strdup(h->protocol_whitelist);
851 if (!(*s)->protocol_whitelist && h->protocol_whitelist) {
855 (*s)->protocol_blacklist = av_strdup(h->protocol_blacklist);
856 if (!(*s)->protocol_blacklist && h->protocol_blacklist) {
860 (*s)->direct = h->flags & AVIO_FLAG_DIRECT;
862 (*s)->seekable = h->is_streamed ? 0 : AVIO_SEEKABLE_NORMAL;
863 (*s)->max_packet_size = max_packet_size;
865 (*s)->read_pause = io_read_pause;
866 (*s)->read_seek = io_read_seek;
868 (*s)->av_class = &ff_avio_class;
873 return AVERROR(ENOMEM);
876 int ffio_ensure_seekback(AVIOContext *s, int64_t buf_size)
879 int max_buffer_size = s->max_packet_size ?
880 s->max_packet_size : IO_BUFFER_SIZE;
881 int filled = s->buf_end - s->buffer;
882 ptrdiff_t checksum_ptr_offset = s->checksum_ptr ? s->checksum_ptr - s->buffer : -1;
884 buf_size += s->buf_ptr - s->buffer + max_buffer_size;
886 if (buf_size < filled || s->seekable || !s->read_packet)
888 av_assert0(!s->write_flag);
890 buffer = av_malloc(buf_size);
892 return AVERROR(ENOMEM);
894 memcpy(buffer, s->buffer, filled);
896 s->buf_ptr = buffer + (s->buf_ptr - s->buffer);
897 s->buf_end = buffer + (s->buf_end - s->buffer);
899 s->buffer_size = buf_size;
900 if (checksum_ptr_offset >= 0)
901 s->checksum_ptr = s->buffer + checksum_ptr_offset;
905 int ffio_set_buf_size(AVIOContext *s, int buf_size)
908 buffer = av_malloc(buf_size);
910 return AVERROR(ENOMEM);
914 s->orig_buffer_size =
915 s->buffer_size = buf_size;
917 url_resetbuf(s, s->write_flag ? AVIO_FLAG_WRITE : AVIO_FLAG_READ);
921 static int url_resetbuf(AVIOContext *s, int flags)
923 av_assert1(flags == AVIO_FLAG_WRITE || flags == AVIO_FLAG_READ);
925 if (flags & AVIO_FLAG_WRITE) {
926 s->buf_end = s->buffer + s->buffer_size;
929 s->buf_end = s->buffer;
935 int ffio_rewind_with_probe_data(AVIOContext *s, unsigned char **bufp, int buf_size)
937 int64_t buffer_start;
939 int overlap, new_size, alloc_size;
940 uint8_t *buf = *bufp;
944 return AVERROR(EINVAL);
947 buffer_size = s->buf_end - s->buffer;
949 /* the buffers must touch or overlap */
950 if ((buffer_start = s->pos - buffer_size) > buf_size) {
952 return AVERROR(EINVAL);
955 overlap = buf_size - buffer_start;
956 new_size = buf_size + buffer_size - overlap;
958 alloc_size = FFMAX(s->buffer_size, new_size);
959 if (alloc_size > buf_size)
960 if (!(buf = (*bufp) = av_realloc_f(buf, 1, alloc_size)))
961 return AVERROR(ENOMEM);
963 if (new_size > buf_size) {
964 memcpy(buf + buf_size, s->buffer + overlap, buffer_size - overlap);
969 s->buf_ptr = s->buffer = buf;
970 s->buffer_size = alloc_size;
972 s->buf_end = s->buf_ptr + buf_size;
979 int avio_open(AVIOContext **s, const char *filename, int flags)
981 return avio_open2(s, filename, flags, NULL, NULL);
984 int ffio_open_whitelist(AVIOContext **s, const char *filename, int flags,
985 const AVIOInterruptCB *int_cb, AVDictionary **options,
986 const char *whitelist, const char *blacklist
992 err = ffurl_open_whitelist(&h, filename, flags, int_cb, options, whitelist, blacklist);
995 err = ffio_fdopen(s, h);
1003 int avio_open2(AVIOContext **s, const char *filename, int flags,
1004 const AVIOInterruptCB *int_cb, AVDictionary **options)
1006 return ffio_open_whitelist(s, filename, flags, int_cb, options, NULL, NULL);
1009 int ffio_open2_wrapper(struct AVFormatContext *s, AVIOContext **pb, const char *url, int flags,
1010 const AVIOInterruptCB *int_cb, AVDictionary **options)
1012 return ffio_open_whitelist(pb, url, flags, int_cb, options, s->protocol_whitelist, s->protocol_blacklist);
1015 int avio_close(AVIOContext *s)
1017 AVIOInternal *internal;
1024 internal = s->opaque;
1027 av_freep(&s->opaque);
1028 av_freep(&s->buffer);
1030 av_log(s, AV_LOG_DEBUG, "Statistics: %d seeks, %d writeouts\n", s->seek_count, s->writeout_count);
1032 av_log(s, AV_LOG_DEBUG, "Statistics: %"PRId64" bytes read, %d seeks\n", s->bytes_read, s->seek_count);
1035 return ffurl_close(h);
1038 int avio_closep(AVIOContext **s)
1040 int ret = avio_close(*s);
1045 int avio_printf(AVIOContext *s, const char *fmt, ...)
1048 char buf[4096]; /* update doc entry in avio.h if changed */
1052 ret = vsnprintf(buf, sizeof(buf), fmt, ap);
1054 avio_write(s, buf, strlen(buf));
1058 int avio_pause(AVIOContext *s, int pause)
1061 return AVERROR(ENOSYS);
1062 return s->read_pause(s->opaque, pause);
1065 int64_t avio_seek_time(AVIOContext *s, int stream_index,
1066 int64_t timestamp, int flags)
1070 return AVERROR(ENOSYS);
1071 ret = s->read_seek(s->opaque, stream_index, timestamp, flags);
1074 s->buf_ptr = s->buf_end; // Flush buffer
1075 pos = s->seek(s->opaque, 0, SEEK_CUR);
1078 else if (pos != AVERROR(ENOSYS))
1084 int avio_read_to_bprint(AVIOContext *h, AVBPrint *pb, size_t max_size)
1089 ret = avio_read(h, buf, FFMIN(max_size, sizeof(buf)));
1090 if (ret == AVERROR_EOF)
1094 av_bprint_append_data(pb, buf, ret);
1095 if (!av_bprint_is_complete(pb))
1096 return AVERROR(ENOMEM);
1102 int avio_accept(AVIOContext *s, AVIOContext **c)
1105 URLContext *sc = s->opaque;
1106 URLContext *cc = NULL;
1107 ret = ffurl_accept(sc, &cc);
1110 return ffio_fdopen(c, cc);
1113 int avio_handshake(AVIOContext *c)
1115 URLContext *cc = c->opaque;
1116 return ffurl_handshake(cc);
1119 /* output in a dynamic buffer */
1121 typedef struct DynBuffer {
1122 int pos, size, allocated_size;
1125 uint8_t io_buffer[1];
1128 static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size)
1130 DynBuffer *d = opaque;
1131 unsigned new_size, new_allocated_size;
1133 /* reallocate buffer if needed */
1134 new_size = d->pos + buf_size;
1135 new_allocated_size = d->allocated_size;
1136 if (new_size < d->pos || new_size > INT_MAX/2)
1138 while (new_size > new_allocated_size) {
1139 if (!new_allocated_size)
1140 new_allocated_size = new_size;
1142 new_allocated_size += new_allocated_size / 2 + 1;
1145 if (new_allocated_size > d->allocated_size) {
1147 if ((err = av_reallocp(&d->buffer, new_allocated_size)) < 0) {
1148 d->allocated_size = 0;
1152 d->allocated_size = new_allocated_size;
1154 memcpy(d->buffer + d->pos, buf, buf_size);
1156 if (d->pos > d->size)
1161 static int dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size)
1163 unsigned char buf1[4];
1166 /* packetized write: output the header */
1167 AV_WB32(buf1, buf_size);
1168 ret = dyn_buf_write(opaque, buf1, 4);
1173 return dyn_buf_write(opaque, buf, buf_size);
1176 static int64_t dyn_buf_seek(void *opaque, int64_t offset, int whence)
1178 DynBuffer *d = opaque;
1180 if (whence == SEEK_CUR)
1182 else if (whence == SEEK_END)
1184 if (offset < 0 || offset > 0x7fffffffLL)
1190 static int url_open_dyn_buf_internal(AVIOContext **s, int max_packet_size)
1193 unsigned io_buffer_size = max_packet_size ? max_packet_size : 1024;
1195 if (sizeof(DynBuffer) + io_buffer_size < io_buffer_size)
1197 d = av_mallocz(sizeof(DynBuffer) + io_buffer_size);
1199 return AVERROR(ENOMEM);
1200 d->io_buffer_size = io_buffer_size;
1201 *s = avio_alloc_context(d->io_buffer, d->io_buffer_size, 1, d, NULL,
1202 max_packet_size ? dyn_packet_buf_write : dyn_buf_write,
1203 max_packet_size ? NULL : dyn_buf_seek);
1206 return AVERROR(ENOMEM);
1208 (*s)->max_packet_size = max_packet_size;
1212 int avio_open_dyn_buf(AVIOContext **s)
1214 return url_open_dyn_buf_internal(s, 0);
1217 int ffio_open_dyn_packet_buf(AVIOContext **s, int max_packet_size)
1219 if (max_packet_size <= 0)
1221 return url_open_dyn_buf_internal(s, max_packet_size);
1224 int avio_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
1228 static const char padbuf[AV_INPUT_BUFFER_PADDING_SIZE] = {0};
1236 /* don't attempt to pad fixed-size packet buffers */
1237 if (!s->max_packet_size) {
1238 avio_write(s, padbuf, sizeof(padbuf));
1239 padding = AV_INPUT_BUFFER_PADDING_SIZE;
1245 *pbuffer = d->buffer;
1249 return size - padding;
1252 void ffio_free_dyn_buf(AVIOContext **s)
1257 avio_close_dyn_buf(*s, &tmp);
1262 static int null_buf_write(void *opaque, uint8_t *buf, int buf_size)
1264 DynBuffer *d = opaque;
1267 if (d->pos > d->size)
1272 int ffio_open_null_buf(AVIOContext **s)
1274 int ret = url_open_dyn_buf_internal(s, 0);
1276 AVIOContext *pb = *s;
1277 pb->write_packet = null_buf_write;
1282 int ffio_close_null_buf(AVIOContext *s)
1284 DynBuffer *d = s->opaque;