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 static void *ff_avio_child_next(void *obj, void *prev)
48 AVIOInternal *internal = s->opaque;
49 return prev ? NULL : internal->h;
52 static const AVClass *ff_avio_child_class_next(const AVClass *prev)
54 return prev ? NULL : &ffurl_context_class;
57 #define OFFSET(x) offsetof(AVIOContext,x)
58 #define E AV_OPT_FLAG_ENCODING_PARAM
59 #define D AV_OPT_FLAG_DECODING_PARAM
60 static const AVOption ff_avio_options[] = {
61 {"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 },
65 const AVClass ff_avio_class = {
66 .class_name = "AVIOContext",
67 .item_name = av_default_item_name,
68 .version = LIBAVUTIL_VERSION_INT,
69 .option = ff_avio_options,
70 .child_next = ff_avio_child_next,
71 .child_class_next = ff_avio_child_class_next,
74 static void fill_buffer(AVIOContext *s);
75 static int url_resetbuf(AVIOContext *s, int flags);
77 int ffio_init_context(AVIOContext *s,
78 unsigned char *buffer,
82 int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
83 int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
84 int64_t (*seek)(void *opaque, int64_t offset, int whence))
88 s->buffer_size = buffer_size;
93 url_resetbuf(s, write_flag ? AVIO_FLAG_WRITE : AVIO_FLAG_READ);
95 s->write_packet = write_packet;
96 s->read_packet = read_packet;
102 s->seekable = seek ? AVIO_SEEKABLE_NORMAL : 0;
103 s->max_packet_size = 0;
104 s->update_checksum = NULL;
105 s->short_seek_threshold = SHORT_SEEK_THRESHOLD;
107 if (!read_packet && !write_flag) {
108 s->pos = buffer_size;
109 s->buf_end = s->buffer + buffer_size;
111 s->read_pause = NULL;
117 AVIOContext *avio_alloc_context(
118 unsigned char *buffer,
122 int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
123 int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
124 int64_t (*seek)(void *opaque, int64_t offset, int whence))
126 AVIOContext *s = av_mallocz(sizeof(AVIOContext));
129 ffio_init_context(s, buffer, buffer_size, write_flag, opaque,
130 read_packet, write_packet, seek);
134 static void writeout(AVIOContext *s, const uint8_t *data, int len)
136 if (s->write_packet && !s->error) {
137 int ret = s->write_packet(s->opaque, (uint8_t *)data, len);
142 s->writeout_count ++;
146 static void flush_buffer(AVIOContext *s)
148 if (s->write_flag && s->buf_ptr > s->buffer) {
149 writeout(s, s->buffer, s->buf_ptr - s->buffer);
150 if (s->update_checksum) {
151 s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
152 s->buf_ptr - s->checksum_ptr);
153 s->checksum_ptr = s->buffer;
156 s->buf_ptr = s->buffer;
158 s->buf_end = s->buffer;
161 void avio_w8(AVIOContext *s, int b)
163 av_assert2(b>=-128 && b<=255);
165 if (s->buf_ptr >= s->buf_end)
169 void ffio_fill(AVIOContext *s, int b, int count)
172 int len = FFMIN(s->buf_end - s->buf_ptr, count);
173 memset(s->buf_ptr, b, len);
176 if (s->buf_ptr >= s->buf_end)
183 void avio_write(AVIOContext *s, const unsigned char *buf, int size)
185 if (s->direct && !s->update_checksum) {
187 writeout(s, buf, size);
191 int len = FFMIN(s->buf_end - s->buf_ptr, size);
192 memcpy(s->buf_ptr, buf, len);
195 if (s->buf_ptr >= s->buf_end)
203 void avio_flush(AVIOContext *s)
209 int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
213 int force = whence & AVSEEK_FORCE;
215 whence &= ~AVSEEK_FORCE;
218 return AVERROR(EINVAL);
220 buffer_size = s->buf_end - s->buffer;
221 // pos is the absolute position that the beginning of s->buffer corresponds to in the file
222 pos = s->pos - (s->write_flag ? 0 : buffer_size);
224 if (whence != SEEK_CUR && whence != SEEK_SET)
225 return AVERROR(EINVAL);
227 if (whence == SEEK_CUR) {
228 offset1 = pos + (s->buf_ptr - s->buffer);
234 return AVERROR(EINVAL);
236 offset1 = offset - pos; // "offset1" is the relative offset from the beginning of s->buffer
237 if (!s->must_flush && (!s->direct || !s->seek) &&
238 offset1 >= 0 && offset1 <= buffer_size - s->write_flag) {
239 /* can do the seek inside the buffer */
240 s->buf_ptr = s->buffer + offset1;
241 } else if ((!s->seekable ||
242 offset1 <= buffer_size + s->short_seek_threshold) &&
243 !s->write_flag && offset1 >= 0 &&
244 (!s->direct || !s->seek) &&
245 (whence != SEEK_END || force)) {
246 while(s->pos < offset && !s->eof_reached)
250 s->buf_ptr = s->buf_end - (s->pos - offset);
251 } else if(!s->write_flag && offset1 < 0 && -offset1 < buffer_size>>1 && s->seek && offset > 0) {
254 pos -= FFMIN(buffer_size>>1, pos);
255 if ((res = s->seek(s->opaque, pos, SEEK_SET)) < 0)
258 s->buf_ptr = s->buffer;
262 return avio_seek(s, offset, SEEK_SET | force);
270 return AVERROR(EPIPE);
271 if ((res = s->seek(s->opaque, offset, SEEK_SET)) < 0)
275 s->buf_end = s->buffer;
276 s->buf_ptr = s->buffer;
283 int64_t avio_skip(AVIOContext *s, int64_t offset)
285 return avio_seek(s, offset, SEEK_CUR);
288 int64_t avio_size(AVIOContext *s)
293 return AVERROR(EINVAL);
296 return AVERROR(ENOSYS);
297 size = s->seek(s->opaque, 0, AVSEEK_SIZE);
299 if ((size = s->seek(s->opaque, -1, SEEK_END)) < 0)
302 s->seek(s->opaque, s->pos, SEEK_SET);
307 int avio_feof(AVIOContext *s)
315 return s->eof_reached;
319 int url_feof(AVIOContext *s)
325 void avio_wl32(AVIOContext *s, unsigned int val)
327 avio_w8(s, (uint8_t) val );
328 avio_w8(s, (uint8_t)(val >> 8 ));
329 avio_w8(s, (uint8_t)(val >> 16));
330 avio_w8(s, val >> 24 );
333 void avio_wb32(AVIOContext *s, unsigned int val)
335 avio_w8(s, val >> 24 );
336 avio_w8(s, (uint8_t)(val >> 16));
337 avio_w8(s, (uint8_t)(val >> 8 ));
338 avio_w8(s, (uint8_t) val );
341 int avio_put_str(AVIOContext *s, const char *str)
346 avio_write(s, (const unsigned char *) str, len);
352 static inline int put_str16(AVIOContext *s, const char *str, const int be)
354 const uint8_t *q = str;
362 GET_UTF8(ch, *q++, goto invalid;)
363 PUT_UTF16(ch, tmp, be ? avio_wb16(s, tmp) : avio_wl16(s, tmp);
367 av_log(s, AV_LOG_ERROR, "Invaid UTF8 sequence in avio_put_str16%s\n", be ? "be" : "le");
368 err = AVERROR(EINVAL);
382 #define PUT_STR16(type, big_endian) \
383 int avio_put_str16 ## type(AVIOContext *s, const char *str) \
385 return put_str16(s, str, big_endian); \
393 int ff_get_v_length(uint64_t val)
403 void ff_put_v(AVIOContext *bc, uint64_t val)
405 int i = ff_get_v_length(val);
408 avio_w8(bc, 128 | (uint8_t)(val >> (7*i)));
410 avio_w8(bc, val & 127);
413 void avio_wl64(AVIOContext *s, uint64_t val)
415 avio_wl32(s, (uint32_t)(val & 0xffffffff));
416 avio_wl32(s, (uint32_t)(val >> 32));
419 void avio_wb64(AVIOContext *s, uint64_t val)
421 avio_wb32(s, (uint32_t)(val >> 32));
422 avio_wb32(s, (uint32_t)(val & 0xffffffff));
425 void avio_wl16(AVIOContext *s, unsigned int val)
427 avio_w8(s, (uint8_t)val);
428 avio_w8(s, (int)val >> 8);
431 void avio_wb16(AVIOContext *s, unsigned int val)
433 avio_w8(s, (int)val >> 8);
434 avio_w8(s, (uint8_t)val);
437 void avio_wl24(AVIOContext *s, unsigned int val)
439 avio_wl16(s, val & 0xffff);
440 avio_w8(s, (int)val >> 16);
443 void avio_wb24(AVIOContext *s, unsigned int val)
445 avio_wb16(s, (int)val >> 8);
446 avio_w8(s, (uint8_t)val);
451 static void fill_buffer(AVIOContext *s)
453 int max_buffer_size = s->max_packet_size ?
454 s->max_packet_size : IO_BUFFER_SIZE;
455 uint8_t *dst = s->buf_end - s->buffer + max_buffer_size < s->buffer_size ?
456 s->buf_end : s->buffer;
457 int len = s->buffer_size - (dst - s->buffer);
459 /* can't fill the buffer without read_packet, just set EOF if appropriate */
460 if (!s->read_packet && s->buf_ptr >= s->buf_end)
463 /* no need to do anything if EOF already reached */
467 if (s->update_checksum && dst == s->buffer) {
468 if (s->buf_end > s->checksum_ptr)
469 s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
470 s->buf_end - s->checksum_ptr);
471 s->checksum_ptr = s->buffer;
474 /* make buffer smaller in case it ended up large after probing */
475 if (s->read_packet && s->orig_buffer_size && s->buffer_size > s->orig_buffer_size) {
476 if (dst == s->buffer) {
477 int ret = ffio_set_buf_size(s, s->orig_buffer_size);
479 av_log(s, AV_LOG_WARNING, "Failed to decrease buffer size\n");
481 s->checksum_ptr = dst = s->buffer;
483 av_assert0(len >= s->orig_buffer_size);
484 len = s->orig_buffer_size;
488 len = s->read_packet(s->opaque, dst, len);
492 /* do not modify buffer if EOF reached so that a seek back can
493 be done without rereading data */
500 s->buf_end = dst + len;
501 s->bytes_read += len;
505 unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf,
508 return av_crc(av_crc_get_table(AV_CRC_32_IEEE), checksum, buf, len);
511 unsigned long ff_crcA001_update(unsigned long checksum, const uint8_t *buf,
514 return av_crc(av_crc_get_table(AV_CRC_16_ANSI_LE), checksum, buf, len);
517 unsigned long ffio_get_checksum(AVIOContext *s)
519 s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
520 s->buf_ptr - s->checksum_ptr);
521 s->update_checksum = NULL;
525 void ffio_init_checksum(AVIOContext *s,
526 unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len),
527 unsigned long checksum)
529 s->update_checksum = update_checksum;
530 if (s->update_checksum) {
531 s->checksum = checksum;
532 s->checksum_ptr = s->buf_ptr;
536 /* XXX: put an inline version */
537 int avio_r8(AVIOContext *s)
539 if (s->buf_ptr >= s->buf_end)
541 if (s->buf_ptr < s->buf_end)
542 return *s->buf_ptr++;
546 int avio_read(AVIOContext *s, unsigned char *buf, int size)
552 len = FFMIN(s->buf_end - s->buf_ptr, size);
553 if (len == 0 || s->write_flag) {
554 if((s->direct || size > s->buffer_size) && !s->update_checksum) {
555 // bypass the buffer and read data directly into buf
557 len = s->read_packet(s->opaque, buf, size);
560 /* do not modify buffer if EOF reached so that a seek back can
561 be done without rereading data */
568 s->bytes_read += len;
572 s->buf_ptr = s->buffer;
573 s->buf_end = s->buffer/* + len*/;
577 len = s->buf_end - s->buf_ptr;
582 memcpy(buf, s->buf_ptr, len);
589 if (s->error) return s->error;
590 if (avio_feof(s)) return AVERROR_EOF;
595 int ffio_read_size(AVIOContext *s, unsigned char *buf, int size)
597 int ret = avio_read(s, buf, size);
599 return AVERROR_INVALIDDATA;
603 int ffio_read_indirect(AVIOContext *s, unsigned char *buf, int size, const unsigned char **data)
605 if (s->buf_end - s->buf_ptr >= size && !s->write_flag) {
611 return avio_read(s, buf, size);
615 int ffio_read_partial(AVIOContext *s, unsigned char *buf, int size)
622 if (s->read_packet && s->write_flag) {
623 len = s->read_packet(s->opaque, buf, size);
629 len = s->buf_end - s->buf_ptr;
631 /* Reset the buf_end pointer to the start of the buffer, to make sure
632 * the fill_buffer call tries to read as much data as fits into the
633 * full buffer, instead of just what space is left after buf_end.
634 * This avoids returning partial packets at the end of the buffer,
635 * for packet based inputs.
637 s->buf_end = s->buf_ptr = s->buffer;
639 len = s->buf_end - s->buf_ptr;
643 memcpy(buf, s->buf_ptr, len);
646 if (s->error) return s->error;
647 if (avio_feof(s)) return AVERROR_EOF;
652 unsigned int avio_rl16(AVIOContext *s)
656 val |= avio_r8(s) << 8;
660 unsigned int avio_rl24(AVIOContext *s)
664 val |= avio_r8(s) << 16;
668 unsigned int avio_rl32(AVIOContext *s)
672 val |= avio_rl16(s) << 16;
676 uint64_t avio_rl64(AVIOContext *s)
679 val = (uint64_t)avio_rl32(s);
680 val |= (uint64_t)avio_rl32(s) << 32;
684 unsigned int avio_rb16(AVIOContext *s)
687 val = avio_r8(s) << 8;
692 unsigned int avio_rb24(AVIOContext *s)
695 val = avio_rb16(s) << 8;
699 unsigned int avio_rb32(AVIOContext *s)
702 val = avio_rb16(s) << 16;
707 int ff_get_line(AVIOContext *s, char *buf, int maxlen)
714 if (c && i < maxlen-1)
716 } while (c != '\n' && c != '\r' && c);
717 if (c == '\r' && avio_r8(s) != '\n' && !avio_feof(s))
724 int avio_get_str(AVIOContext *s, int maxlen, char *buf, int buflen)
729 return AVERROR(EINVAL);
730 // reserve 1 byte for terminating 0
731 buflen = FFMIN(buflen - 1, maxlen);
732 for (i = 0; i < buflen; i++)
733 if (!(buf[i] = avio_r8(s)))
736 for (; i < maxlen; i++)
742 #define GET_STR16(type, read) \
743 int avio_get_str16 ##type(AVIOContext *pb, int maxlen, char *buf, int buflen)\
748 return AVERROR(EINVAL); \
749 while (ret + 1 < maxlen) {\
752 GET_UTF16(ch, (ret += 2) <= maxlen ? read(pb) : 0, break;)\
755 PUT_UTF8(ch, tmp, if (q - buf < buflen - 1) *q++ = tmp;)\
761 GET_STR16(le, avio_rl16)
762 GET_STR16(be, avio_rb16)
766 uint64_t avio_rb64(AVIOContext *s)
769 val = (uint64_t)avio_rb32(s) << 32;
770 val |= (uint64_t)avio_rb32(s);
774 uint64_t ffio_read_varlen(AVIOContext *bc){
780 val= (val<<7) + (tmp&127);
785 static int io_read_packet(void *opaque, uint8_t *buf, int buf_size)
787 AVIOInternal *internal = opaque;
788 return ffurl_read(internal->h, buf, buf_size);
791 static int io_write_packet(void *opaque, uint8_t *buf, int buf_size)
793 AVIOInternal *internal = opaque;
794 return ffurl_write(internal->h, buf, buf_size);
797 static int64_t io_seek(void *opaque, int64_t offset, int whence)
799 AVIOInternal *internal = opaque;
800 return ffurl_seek(internal->h, offset, whence);
803 static int io_read_pause(void *opaque, int pause)
805 AVIOInternal *internal = opaque;
806 if (!internal->h->prot->url_read_pause)
807 return AVERROR(ENOSYS);
808 return internal->h->prot->url_read_pause(internal->h, pause);
811 static int64_t io_read_seek(void *opaque, int stream_index, int64_t timestamp, int flags)
813 AVIOInternal *internal = opaque;
814 if (!internal->h->prot->url_read_seek)
815 return AVERROR(ENOSYS);
816 return internal->h->prot->url_read_seek(internal->h, stream_index, timestamp, flags);
819 int ffio_fdopen(AVIOContext **s, URLContext *h)
821 AVIOInternal *internal = NULL;
822 uint8_t *buffer = NULL;
823 int buffer_size, max_packet_size;
825 max_packet_size = h->max_packet_size;
826 if (max_packet_size) {
827 buffer_size = max_packet_size; /* no need to bufferize more than one packet */
829 buffer_size = IO_BUFFER_SIZE;
831 buffer = av_malloc(buffer_size);
833 return AVERROR(ENOMEM);
835 internal = av_mallocz(sizeof(*internal));
841 *s = avio_alloc_context(buffer, buffer_size, h->flags & AVIO_FLAG_WRITE,
842 internal, io_read_packet, io_write_packet, io_seek);
846 (*s)->protocol_whitelist = av_strdup(h->protocol_whitelist);
847 if (!(*s)->protocol_whitelist && h->protocol_whitelist) {
851 (*s)->direct = h->flags & AVIO_FLAG_DIRECT;
853 (*s)->seekable = h->is_streamed ? 0 : AVIO_SEEKABLE_NORMAL;
854 (*s)->max_packet_size = max_packet_size;
856 (*s)->read_pause = io_read_pause;
857 (*s)->read_seek = io_read_seek;
859 (*s)->av_class = &ff_avio_class;
864 return AVERROR(ENOMEM);
867 int ffio_ensure_seekback(AVIOContext *s, int64_t buf_size)
870 int max_buffer_size = s->max_packet_size ?
871 s->max_packet_size : IO_BUFFER_SIZE;
872 int filled = s->buf_end - s->buffer;
873 ptrdiff_t checksum_ptr_offset = s->checksum_ptr ? s->checksum_ptr - s->buffer : -1;
875 buf_size += s->buf_ptr - s->buffer + max_buffer_size;
877 if (buf_size < filled || s->seekable || !s->read_packet)
879 av_assert0(!s->write_flag);
881 buffer = av_malloc(buf_size);
883 return AVERROR(ENOMEM);
885 memcpy(buffer, s->buffer, filled);
887 s->buf_ptr = buffer + (s->buf_ptr - s->buffer);
888 s->buf_end = buffer + (s->buf_end - s->buffer);
890 s->buffer_size = buf_size;
891 if (checksum_ptr_offset >= 0)
892 s->checksum_ptr = s->buffer + checksum_ptr_offset;
896 int ffio_set_buf_size(AVIOContext *s, int buf_size)
899 buffer = av_malloc(buf_size);
901 return AVERROR(ENOMEM);
905 s->orig_buffer_size =
906 s->buffer_size = buf_size;
908 url_resetbuf(s, s->write_flag ? AVIO_FLAG_WRITE : AVIO_FLAG_READ);
912 static int url_resetbuf(AVIOContext *s, int flags)
914 av_assert1(flags == AVIO_FLAG_WRITE || flags == AVIO_FLAG_READ);
916 if (flags & AVIO_FLAG_WRITE) {
917 s->buf_end = s->buffer + s->buffer_size;
920 s->buf_end = s->buffer;
926 int ffio_rewind_with_probe_data(AVIOContext *s, unsigned char **bufp, int buf_size)
928 int64_t buffer_start;
930 int overlap, new_size, alloc_size;
931 uint8_t *buf = *bufp;
935 return AVERROR(EINVAL);
938 buffer_size = s->buf_end - s->buffer;
940 /* the buffers must touch or overlap */
941 if ((buffer_start = s->pos - buffer_size) > buf_size) {
943 return AVERROR(EINVAL);
946 overlap = buf_size - buffer_start;
947 new_size = buf_size + buffer_size - overlap;
949 alloc_size = FFMAX(s->buffer_size, new_size);
950 if (alloc_size > buf_size)
951 if (!(buf = (*bufp) = av_realloc_f(buf, 1, alloc_size)))
952 return AVERROR(ENOMEM);
954 if (new_size > buf_size) {
955 memcpy(buf + buf_size, s->buffer + overlap, buffer_size - overlap);
960 s->buf_ptr = s->buffer = buf;
961 s->buffer_size = alloc_size;
963 s->buf_end = s->buf_ptr + buf_size;
970 int avio_open(AVIOContext **s, const char *filename, int flags)
972 return avio_open2(s, filename, flags, NULL, NULL);
975 int ffio_open_whitelist(AVIOContext **s, const char *filename, int flags,
976 const AVIOInterruptCB *int_cb, AVDictionary **options,
977 const char *whitelist
983 err = ffurl_open_whitelist(&h, filename, flags, int_cb, options, whitelist);
986 err = ffio_fdopen(s, h);
994 int avio_open2(AVIOContext **s, const char *filename, int flags,
995 const AVIOInterruptCB *int_cb, AVDictionary **options)
997 return ffio_open_whitelist(s, filename, flags, int_cb, options, NULL);
1000 int ffio_open2_wrapper(struct AVFormatContext *s, AVIOContext **pb, const char *url, int flags,
1001 const AVIOInterruptCB *int_cb, AVDictionary **options)
1003 return ffio_open_whitelist(pb, url, flags, int_cb, options, s->protocol_whitelist);
1006 int avio_close(AVIOContext *s)
1008 AVIOInternal *internal;
1015 internal = s->opaque;
1018 av_freep(&s->opaque);
1019 av_freep(&s->buffer);
1021 av_log(s, AV_LOG_DEBUG, "Statistics: %d seeks, %d writeouts\n", s->seek_count, s->writeout_count);
1023 av_log(s, AV_LOG_DEBUG, "Statistics: %"PRId64" bytes read, %d seeks\n", s->bytes_read, s->seek_count);
1026 return ffurl_close(h);
1029 int avio_closep(AVIOContext **s)
1031 int ret = avio_close(*s);
1036 int avio_printf(AVIOContext *s, const char *fmt, ...)
1039 char buf[4096]; /* update doc entry in avio.h if changed */
1043 ret = vsnprintf(buf, sizeof(buf), fmt, ap);
1045 avio_write(s, buf, strlen(buf));
1049 int avio_pause(AVIOContext *s, int pause)
1052 return AVERROR(ENOSYS);
1053 return s->read_pause(s->opaque, pause);
1056 int64_t avio_seek_time(AVIOContext *s, int stream_index,
1057 int64_t timestamp, int flags)
1061 return AVERROR(ENOSYS);
1062 ret = s->read_seek(s->opaque, stream_index, timestamp, flags);
1065 s->buf_ptr = s->buf_end; // Flush buffer
1066 pos = s->seek(s->opaque, 0, SEEK_CUR);
1069 else if (pos != AVERROR(ENOSYS))
1075 int avio_read_to_bprint(AVIOContext *h, AVBPrint *pb, size_t max_size)
1080 ret = avio_read(h, buf, FFMIN(max_size, sizeof(buf)));
1081 if (ret == AVERROR_EOF)
1085 av_bprint_append_data(pb, buf, ret);
1086 if (!av_bprint_is_complete(pb))
1087 return AVERROR(ENOMEM);
1093 int avio_accept(AVIOContext *s, AVIOContext **c)
1096 URLContext *sc = s->opaque;
1097 URLContext *cc = NULL;
1098 ret = ffurl_accept(sc, &cc);
1101 return ffio_fdopen(c, cc);
1104 int avio_handshake(AVIOContext *c)
1106 URLContext *cc = c->opaque;
1107 return ffurl_handshake(cc);
1110 /* output in a dynamic buffer */
1112 typedef struct DynBuffer {
1113 int pos, size, allocated_size;
1116 uint8_t io_buffer[1];
1119 static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size)
1121 DynBuffer *d = opaque;
1122 unsigned new_size, new_allocated_size;
1124 /* reallocate buffer if needed */
1125 new_size = d->pos + buf_size;
1126 new_allocated_size = d->allocated_size;
1127 if (new_size < d->pos || new_size > INT_MAX/2)
1129 while (new_size > new_allocated_size) {
1130 if (!new_allocated_size)
1131 new_allocated_size = new_size;
1133 new_allocated_size += new_allocated_size / 2 + 1;
1136 if (new_allocated_size > d->allocated_size) {
1138 if ((err = av_reallocp(&d->buffer, new_allocated_size)) < 0) {
1139 d->allocated_size = 0;
1143 d->allocated_size = new_allocated_size;
1145 memcpy(d->buffer + d->pos, buf, buf_size);
1147 if (d->pos > d->size)
1152 static int dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size)
1154 unsigned char buf1[4];
1157 /* packetized write: output the header */
1158 AV_WB32(buf1, buf_size);
1159 ret = dyn_buf_write(opaque, buf1, 4);
1164 return dyn_buf_write(opaque, buf, buf_size);
1167 static int64_t dyn_buf_seek(void *opaque, int64_t offset, int whence)
1169 DynBuffer *d = opaque;
1171 if (whence == SEEK_CUR)
1173 else if (whence == SEEK_END)
1175 if (offset < 0 || offset > 0x7fffffffLL)
1181 static int url_open_dyn_buf_internal(AVIOContext **s, int max_packet_size)
1184 unsigned io_buffer_size = max_packet_size ? max_packet_size : 1024;
1186 if (sizeof(DynBuffer) + io_buffer_size < io_buffer_size)
1188 d = av_mallocz(sizeof(DynBuffer) + io_buffer_size);
1190 return AVERROR(ENOMEM);
1191 d->io_buffer_size = io_buffer_size;
1192 *s = avio_alloc_context(d->io_buffer, d->io_buffer_size, 1, d, NULL,
1193 max_packet_size ? dyn_packet_buf_write : dyn_buf_write,
1194 max_packet_size ? NULL : dyn_buf_seek);
1197 return AVERROR(ENOMEM);
1199 (*s)->max_packet_size = max_packet_size;
1203 int avio_open_dyn_buf(AVIOContext **s)
1205 return url_open_dyn_buf_internal(s, 0);
1208 int ffio_open_dyn_packet_buf(AVIOContext **s, int max_packet_size)
1210 if (max_packet_size <= 0)
1212 return url_open_dyn_buf_internal(s, max_packet_size);
1215 int avio_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
1219 static const char padbuf[AV_INPUT_BUFFER_PADDING_SIZE] = {0};
1227 /* don't attempt to pad fixed-size packet buffers */
1228 if (!s->max_packet_size) {
1229 avio_write(s, padbuf, sizeof(padbuf));
1230 padding = AV_INPUT_BUFFER_PADDING_SIZE;
1236 *pbuffer = d->buffer;
1240 return size - padding;
1243 void ffio_free_dyn_buf(AVIOContext **s)
1248 avio_close_dyn_buf(*s, &tmp);
1253 static int null_buf_write(void *opaque, uint8_t *buf, int buf_size)
1255 DynBuffer *d = opaque;
1258 if (d->pos > d->size)
1263 int ffio_open_null_buf(AVIOContext **s)
1265 int ret = url_open_dyn_buf_internal(s, 0);
1267 AVIOContext *pb = *s;
1268 pb->write_packet = null_buf_write;
1273 int ffio_close_null_buf(AVIOContext *s)
1275 DynBuffer *d = s->opaque;