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;
118 s->write_data_type = NULL;
119 s->ignore_boundary_point = 0;
120 s->current_type = AVIO_DATA_MARKER_UNKNOWN;
121 s->last_time = AV_NOPTS_VALUE;
122 s->short_seek_get = NULL;
127 AVIOContext *avio_alloc_context(
128 unsigned char *buffer,
132 int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
133 int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
134 int64_t (*seek)(void *opaque, int64_t offset, int whence))
136 AVIOContext *s = av_mallocz(sizeof(AVIOContext));
139 ffio_init_context(s, buffer, buffer_size, write_flag, opaque,
140 read_packet, write_packet, seek);
144 static void writeout(AVIOContext *s, const uint8_t *data, int len)
148 if (s->write_data_type)
149 ret = s->write_data_type(s->opaque, (uint8_t *)data,
153 else if (s->write_packet)
154 ret = s->write_packet(s->opaque, (uint8_t *)data, len);
159 if (s->current_type == AVIO_DATA_MARKER_SYNC_POINT ||
160 s->current_type == AVIO_DATA_MARKER_BOUNDARY_POINT) {
161 s->current_type = AVIO_DATA_MARKER_UNKNOWN;
163 s->last_time = AV_NOPTS_VALUE;
164 s->writeout_count ++;
168 static void flush_buffer(AVIOContext *s)
170 if (s->write_flag && s->buf_ptr > s->buffer) {
171 writeout(s, s->buffer, s->buf_ptr - s->buffer);
172 if (s->update_checksum) {
173 s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
174 s->buf_ptr - s->checksum_ptr);
175 s->checksum_ptr = s->buffer;
178 s->buf_ptr = s->buffer;
180 s->buf_end = s->buffer;
183 void avio_w8(AVIOContext *s, int b)
185 av_assert2(b>=-128 && b<=255);
187 if (s->buf_ptr >= s->buf_end)
191 void ffio_fill(AVIOContext *s, int b, int count)
194 int len = FFMIN(s->buf_end - s->buf_ptr, count);
195 memset(s->buf_ptr, b, len);
198 if (s->buf_ptr >= s->buf_end)
205 void avio_write(AVIOContext *s, const unsigned char *buf, int size)
207 if (s->direct && !s->update_checksum) {
209 writeout(s, buf, size);
213 int len = FFMIN(s->buf_end - s->buf_ptr, size);
214 memcpy(s->buf_ptr, buf, len);
217 if (s->buf_ptr >= s->buf_end)
225 void avio_flush(AVIOContext *s)
231 int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
235 int force = whence & AVSEEK_FORCE;
238 whence &= ~AVSEEK_FORCE;
241 return AVERROR(EINVAL);
243 buffer_size = s->buf_end - s->buffer;
244 // pos is the absolute position that the beginning of s->buffer corresponds to in the file
245 pos = s->pos - (s->write_flag ? 0 : buffer_size);
247 if (whence != SEEK_CUR && whence != SEEK_SET)
248 return AVERROR(EINVAL);
250 if (whence == SEEK_CUR) {
251 offset1 = pos + (s->buf_ptr - s->buffer);
257 return AVERROR(EINVAL);
259 if (s->short_seek_get) {
260 short_seek = s->short_seek_get(s->opaque);
261 /* fallback to default short seek */
263 short_seek = s->short_seek_threshold;
265 short_seek = s->short_seek_threshold;
267 offset1 = offset - pos; // "offset1" is the relative offset from the beginning of s->buffer
268 if (!s->must_flush && (!s->direct || !s->seek) &&
269 offset1 >= 0 && offset1 <= buffer_size - s->write_flag) {
270 /* can do the seek inside the buffer */
271 s->buf_ptr = s->buffer + offset1;
272 } else if ((!(s->seekable & AVIO_SEEKABLE_NORMAL) ||
273 offset1 <= buffer_size + short_seek) &&
274 !s->write_flag && offset1 >= 0 &&
275 (!s->direct || !s->seek) &&
276 (whence != SEEK_END || force)) {
277 while(s->pos < offset && !s->eof_reached)
281 s->buf_ptr = s->buf_end - (s->pos - offset);
282 } else if(!s->write_flag && offset1 < 0 && -offset1 < buffer_size>>1 && s->seek && offset > 0) {
285 pos -= FFMIN(buffer_size>>1, pos);
286 if ((res = s->seek(s->opaque, pos, SEEK_SET)) < 0)
289 s->buf_ptr = s->buffer;
293 return avio_seek(s, offset, SEEK_SET | force);
301 return AVERROR(EPIPE);
302 if ((res = s->seek(s->opaque, offset, SEEK_SET)) < 0)
306 s->buf_end = s->buffer;
307 s->buf_ptr = s->buffer;
314 int64_t avio_skip(AVIOContext *s, int64_t offset)
316 return avio_seek(s, offset, SEEK_CUR);
319 int64_t avio_size(AVIOContext *s)
324 return AVERROR(EINVAL);
327 return AVERROR(ENOSYS);
328 size = s->seek(s->opaque, 0, AVSEEK_SIZE);
330 if ((size = s->seek(s->opaque, -1, SEEK_END)) < 0)
333 s->seek(s->opaque, s->pos, SEEK_SET);
338 int avio_feof(AVIOContext *s)
346 return s->eof_reached;
350 int url_feof(AVIOContext *s)
356 void avio_wl32(AVIOContext *s, unsigned int val)
358 avio_w8(s, (uint8_t) val );
359 avio_w8(s, (uint8_t)(val >> 8 ));
360 avio_w8(s, (uint8_t)(val >> 16));
361 avio_w8(s, val >> 24 );
364 void avio_wb32(AVIOContext *s, unsigned int val)
366 avio_w8(s, val >> 24 );
367 avio_w8(s, (uint8_t)(val >> 16));
368 avio_w8(s, (uint8_t)(val >> 8 ));
369 avio_w8(s, (uint8_t) val );
372 int avio_put_str(AVIOContext *s, const char *str)
377 avio_write(s, (const unsigned char *) str, len);
383 static inline int put_str16(AVIOContext *s, const char *str, const int be)
385 const uint8_t *q = str;
393 GET_UTF8(ch, *q++, goto invalid;)
394 PUT_UTF16(ch, tmp, be ? avio_wb16(s, tmp) : avio_wl16(s, tmp);
398 av_log(s, AV_LOG_ERROR, "Invalid UTF8 sequence in avio_put_str16%s\n", be ? "be" : "le");
399 err = AVERROR(EINVAL);
413 #define PUT_STR16(type, big_endian) \
414 int avio_put_str16 ## type(AVIOContext *s, const char *str) \
416 return put_str16(s, str, big_endian); \
424 int ff_get_v_length(uint64_t val)
434 void ff_put_v(AVIOContext *bc, uint64_t val)
436 int i = ff_get_v_length(val);
439 avio_w8(bc, 128 | (uint8_t)(val >> (7*i)));
441 avio_w8(bc, val & 127);
444 void avio_wl64(AVIOContext *s, uint64_t val)
446 avio_wl32(s, (uint32_t)(val & 0xffffffff));
447 avio_wl32(s, (uint32_t)(val >> 32));
450 void avio_wb64(AVIOContext *s, uint64_t val)
452 avio_wb32(s, (uint32_t)(val >> 32));
453 avio_wb32(s, (uint32_t)(val & 0xffffffff));
456 void avio_wl16(AVIOContext *s, unsigned int val)
458 avio_w8(s, (uint8_t)val);
459 avio_w8(s, (int)val >> 8);
462 void avio_wb16(AVIOContext *s, unsigned int val)
464 avio_w8(s, (int)val >> 8);
465 avio_w8(s, (uint8_t)val);
468 void avio_wl24(AVIOContext *s, unsigned int val)
470 avio_wl16(s, val & 0xffff);
471 avio_w8(s, (int)val >> 16);
474 void avio_wb24(AVIOContext *s, unsigned int val)
476 avio_wb16(s, (int)val >> 8);
477 avio_w8(s, (uint8_t)val);
480 void avio_write_marker(AVIOContext *s, int64_t time, enum AVIODataMarkerType type)
482 if (!s->write_data_type)
484 // If ignoring boundary points, just treat it as unknown
485 if (type == AVIO_DATA_MARKER_BOUNDARY_POINT && s->ignore_boundary_point)
486 type = AVIO_DATA_MARKER_UNKNOWN;
487 // Avoid unnecessary flushes if we are already in non-header/trailer
488 // data and setting the type to unknown
489 if (type == AVIO_DATA_MARKER_UNKNOWN &&
490 (s->current_type != AVIO_DATA_MARKER_HEADER &&
491 s->current_type != AVIO_DATA_MARKER_TRAILER))
495 case AVIO_DATA_MARKER_HEADER:
496 case AVIO_DATA_MARKER_TRAILER:
497 // For header/trailer, ignore a new marker of the same type;
498 // consecutive header/trailer markers can be merged.
499 if (type == s->current_type)
504 // If we've reached here, we have a new, noteworthy marker.
505 // Flush the previous data and mark the start of the new data.
507 s->current_type = type;
513 static void fill_buffer(AVIOContext *s)
515 int max_buffer_size = s->max_packet_size ?
516 s->max_packet_size : IO_BUFFER_SIZE;
517 uint8_t *dst = s->buf_end - s->buffer + max_buffer_size < s->buffer_size ?
518 s->buf_end : s->buffer;
519 int len = s->buffer_size - (dst - s->buffer);
521 /* can't fill the buffer without read_packet, just set EOF if appropriate */
522 if (!s->read_packet && s->buf_ptr >= s->buf_end)
525 /* no need to do anything if EOF already reached */
529 if (s->update_checksum && dst == s->buffer) {
530 if (s->buf_end > s->checksum_ptr)
531 s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
532 s->buf_end - s->checksum_ptr);
533 s->checksum_ptr = s->buffer;
536 /* make buffer smaller in case it ended up large after probing */
537 if (s->read_packet && s->orig_buffer_size && s->buffer_size > s->orig_buffer_size) {
538 if (dst == s->buffer) {
539 int ret = ffio_set_buf_size(s, s->orig_buffer_size);
541 av_log(s, AV_LOG_WARNING, "Failed to decrease buffer size\n");
543 s->checksum_ptr = dst = s->buffer;
545 av_assert0(len >= s->orig_buffer_size);
546 len = s->orig_buffer_size;
550 len = s->read_packet(s->opaque, dst, len);
554 /* do not modify buffer if EOF reached so that a seek back can
555 be done without rereading data */
562 s->buf_end = dst + len;
563 s->bytes_read += len;
567 unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf,
570 return av_crc(av_crc_get_table(AV_CRC_32_IEEE), checksum, buf, len);
573 unsigned long ff_crcEDB88320_update(unsigned long checksum, const uint8_t *buf,
576 return av_crc(av_crc_get_table(AV_CRC_32_IEEE_LE), checksum, buf, len);
579 unsigned long ff_crcA001_update(unsigned long checksum, const uint8_t *buf,
582 return av_crc(av_crc_get_table(AV_CRC_16_ANSI_LE), checksum, buf, len);
585 unsigned long ffio_get_checksum(AVIOContext *s)
587 s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
588 s->buf_ptr - s->checksum_ptr);
589 s->update_checksum = NULL;
593 void ffio_init_checksum(AVIOContext *s,
594 unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len),
595 unsigned long checksum)
597 s->update_checksum = update_checksum;
598 if (s->update_checksum) {
599 s->checksum = checksum;
600 s->checksum_ptr = s->buf_ptr;
604 /* XXX: put an inline version */
605 int avio_r8(AVIOContext *s)
607 if (s->buf_ptr >= s->buf_end)
609 if (s->buf_ptr < s->buf_end)
610 return *s->buf_ptr++;
614 int avio_read(AVIOContext *s, unsigned char *buf, int size)
620 len = FFMIN(s->buf_end - s->buf_ptr, size);
621 if (len == 0 || s->write_flag) {
622 if((s->direct || size > s->buffer_size) && !s->update_checksum) {
623 // bypass the buffer and read data directly into buf
625 len = s->read_packet(s->opaque, buf, size);
628 /* do not modify buffer if EOF reached so that a seek back can
629 be done without rereading data */
636 s->bytes_read += len;
640 s->buf_ptr = s->buffer;
641 s->buf_end = s->buffer/* + len*/;
645 len = s->buf_end - s->buf_ptr;
650 memcpy(buf, s->buf_ptr, len);
657 if (s->error) return s->error;
658 if (avio_feof(s)) return AVERROR_EOF;
663 int ffio_read_size(AVIOContext *s, unsigned char *buf, int size)
665 int ret = avio_read(s, buf, size);
667 return AVERROR_INVALIDDATA;
671 int ffio_read_indirect(AVIOContext *s, unsigned char *buf, int size, const unsigned char **data)
673 if (s->buf_end - s->buf_ptr >= size && !s->write_flag) {
679 return avio_read(s, buf, size);
683 int ffio_read_partial(AVIOContext *s, unsigned char *buf, int size)
690 if (s->read_packet && s->write_flag) {
691 len = s->read_packet(s->opaque, buf, size);
697 len = s->buf_end - s->buf_ptr;
699 /* Reset the buf_end pointer to the start of the buffer, to make sure
700 * the fill_buffer call tries to read as much data as fits into the
701 * full buffer, instead of just what space is left after buf_end.
702 * This avoids returning partial packets at the end of the buffer,
703 * for packet based inputs.
705 s->buf_end = s->buf_ptr = s->buffer;
707 len = s->buf_end - s->buf_ptr;
711 memcpy(buf, s->buf_ptr, len);
714 if (s->error) return s->error;
715 if (avio_feof(s)) return AVERROR_EOF;
720 unsigned int avio_rl16(AVIOContext *s)
724 val |= avio_r8(s) << 8;
728 unsigned int avio_rl24(AVIOContext *s)
732 val |= avio_r8(s) << 16;
736 unsigned int avio_rl32(AVIOContext *s)
740 val |= avio_rl16(s) << 16;
744 uint64_t avio_rl64(AVIOContext *s)
747 val = (uint64_t)avio_rl32(s);
748 val |= (uint64_t)avio_rl32(s) << 32;
752 unsigned int avio_rb16(AVIOContext *s)
755 val = avio_r8(s) << 8;
760 unsigned int avio_rb24(AVIOContext *s)
763 val = avio_rb16(s) << 8;
767 unsigned int avio_rb32(AVIOContext *s)
770 val = avio_rb16(s) << 16;
775 int ff_get_line(AVIOContext *s, char *buf, int maxlen)
782 if (c && i < maxlen-1)
784 } while (c != '\n' && c != '\r' && c);
785 if (c == '\r' && avio_r8(s) != '\n' && !avio_feof(s))
792 int avio_get_str(AVIOContext *s, int maxlen, char *buf, int buflen)
797 return AVERROR(EINVAL);
798 // reserve 1 byte for terminating 0
799 buflen = FFMIN(buflen - 1, maxlen);
800 for (i = 0; i < buflen; i++)
801 if (!(buf[i] = avio_r8(s)))
804 for (; i < maxlen; i++)
810 #define GET_STR16(type, read) \
811 int avio_get_str16 ##type(AVIOContext *pb, int maxlen, char *buf, int buflen)\
816 return AVERROR(EINVAL); \
817 while (ret + 1 < maxlen) {\
820 GET_UTF16(ch, (ret += 2) <= maxlen ? read(pb) : 0, break;)\
823 PUT_UTF8(ch, tmp, if (q - buf < buflen - 1) *q++ = tmp;)\
829 GET_STR16(le, avio_rl16)
830 GET_STR16(be, avio_rb16)
834 uint64_t avio_rb64(AVIOContext *s)
837 val = (uint64_t)avio_rb32(s) << 32;
838 val |= (uint64_t)avio_rb32(s);
842 uint64_t ffio_read_varlen(AVIOContext *bc){
848 val= (val<<7) + (tmp&127);
853 static int io_read_packet(void *opaque, uint8_t *buf, int buf_size)
855 AVIOInternal *internal = opaque;
856 return ffurl_read(internal->h, buf, buf_size);
859 static int io_write_packet(void *opaque, uint8_t *buf, int buf_size)
861 AVIOInternal *internal = opaque;
862 return ffurl_write(internal->h, buf, buf_size);
865 static int64_t io_seek(void *opaque, int64_t offset, int whence)
867 AVIOInternal *internal = opaque;
868 return ffurl_seek(internal->h, offset, whence);
871 static int io_short_seek(void *opaque)
873 AVIOInternal *internal = opaque;
874 return ffurl_get_short_seek(internal->h);
877 static int io_read_pause(void *opaque, int pause)
879 AVIOInternal *internal = opaque;
880 if (!internal->h->prot->url_read_pause)
881 return AVERROR(ENOSYS);
882 return internal->h->prot->url_read_pause(internal->h, pause);
885 static int64_t io_read_seek(void *opaque, int stream_index, int64_t timestamp, int flags)
887 AVIOInternal *internal = opaque;
888 if (!internal->h->prot->url_read_seek)
889 return AVERROR(ENOSYS);
890 return internal->h->prot->url_read_seek(internal->h, stream_index, timestamp, flags);
893 int ffio_fdopen(AVIOContext **s, URLContext *h)
895 AVIOInternal *internal = NULL;
896 uint8_t *buffer = NULL;
897 int buffer_size, max_packet_size;
899 max_packet_size = h->max_packet_size;
900 if (max_packet_size) {
901 buffer_size = max_packet_size; /* no need to bufferize more than one packet */
903 buffer_size = IO_BUFFER_SIZE;
905 buffer = av_malloc(buffer_size);
907 return AVERROR(ENOMEM);
909 internal = av_mallocz(sizeof(*internal));
915 *s = avio_alloc_context(buffer, buffer_size, h->flags & AVIO_FLAG_WRITE,
916 internal, io_read_packet, io_write_packet, io_seek);
920 (*s)->protocol_whitelist = av_strdup(h->protocol_whitelist);
921 if (!(*s)->protocol_whitelist && h->protocol_whitelist) {
925 (*s)->protocol_blacklist = av_strdup(h->protocol_blacklist);
926 if (!(*s)->protocol_blacklist && h->protocol_blacklist) {
930 (*s)->direct = h->flags & AVIO_FLAG_DIRECT;
932 (*s)->seekable = h->is_streamed ? 0 : AVIO_SEEKABLE_NORMAL;
933 (*s)->max_packet_size = max_packet_size;
935 (*s)->read_pause = io_read_pause;
936 (*s)->read_seek = io_read_seek;
938 if (h->prot->url_read_seek)
939 (*s)->seekable |= AVIO_SEEKABLE_TIME;
941 (*s)->short_seek_get = io_short_seek;
942 (*s)->av_class = &ff_avio_class;
947 return AVERROR(ENOMEM);
950 int ffio_ensure_seekback(AVIOContext *s, int64_t buf_size)
953 int max_buffer_size = s->max_packet_size ?
954 s->max_packet_size : IO_BUFFER_SIZE;
955 int filled = s->buf_end - s->buffer;
956 ptrdiff_t checksum_ptr_offset = s->checksum_ptr ? s->checksum_ptr - s->buffer : -1;
958 buf_size += s->buf_ptr - s->buffer + max_buffer_size;
960 if (buf_size < filled || s->seekable || !s->read_packet)
962 av_assert0(!s->write_flag);
964 buffer = av_malloc(buf_size);
966 return AVERROR(ENOMEM);
968 memcpy(buffer, s->buffer, filled);
970 s->buf_ptr = buffer + (s->buf_ptr - s->buffer);
971 s->buf_end = buffer + (s->buf_end - s->buffer);
973 s->buffer_size = buf_size;
974 if (checksum_ptr_offset >= 0)
975 s->checksum_ptr = s->buffer + checksum_ptr_offset;
979 int ffio_set_buf_size(AVIOContext *s, int buf_size)
982 buffer = av_malloc(buf_size);
984 return AVERROR(ENOMEM);
988 s->orig_buffer_size =
989 s->buffer_size = buf_size;
991 url_resetbuf(s, s->write_flag ? AVIO_FLAG_WRITE : AVIO_FLAG_READ);
995 static int url_resetbuf(AVIOContext *s, int flags)
997 av_assert1(flags == AVIO_FLAG_WRITE || flags == AVIO_FLAG_READ);
999 if (flags & AVIO_FLAG_WRITE) {
1000 s->buf_end = s->buffer + s->buffer_size;
1003 s->buf_end = s->buffer;
1009 int ffio_rewind_with_probe_data(AVIOContext *s, unsigned char **bufp, int buf_size)
1011 int64_t buffer_start;
1013 int overlap, new_size, alloc_size;
1014 uint8_t *buf = *bufp;
1016 if (s->write_flag) {
1018 return AVERROR(EINVAL);
1021 buffer_size = s->buf_end - s->buffer;
1023 /* the buffers must touch or overlap */
1024 if ((buffer_start = s->pos - buffer_size) > buf_size) {
1026 return AVERROR(EINVAL);
1029 overlap = buf_size - buffer_start;
1030 new_size = buf_size + buffer_size - overlap;
1032 alloc_size = FFMAX(s->buffer_size, new_size);
1033 if (alloc_size > buf_size)
1034 if (!(buf = (*bufp) = av_realloc_f(buf, 1, alloc_size)))
1035 return AVERROR(ENOMEM);
1037 if (new_size > buf_size) {
1038 memcpy(buf + buf_size, s->buffer + overlap, buffer_size - overlap);
1039 buf_size = new_size;
1043 s->buf_ptr = s->buffer = buf;
1044 s->buffer_size = alloc_size;
1046 s->buf_end = s->buf_ptr + buf_size;
1053 int avio_open(AVIOContext **s, const char *filename, int flags)
1055 return avio_open2(s, filename, flags, NULL, NULL);
1058 int ffio_open_whitelist(AVIOContext **s, const char *filename, int flags,
1059 const AVIOInterruptCB *int_cb, AVDictionary **options,
1060 const char *whitelist, const char *blacklist
1066 err = ffurl_open_whitelist(&h, filename, flags, int_cb, options, whitelist, blacklist, NULL);
1069 err = ffio_fdopen(s, h);
1077 int avio_open2(AVIOContext **s, const char *filename, int flags,
1078 const AVIOInterruptCB *int_cb, AVDictionary **options)
1080 return ffio_open_whitelist(s, filename, flags, int_cb, options, NULL, NULL);
1083 int ffio_open2_wrapper(struct AVFormatContext *s, AVIOContext **pb, const char *url, int flags,
1084 const AVIOInterruptCB *int_cb, AVDictionary **options)
1086 return ffio_open_whitelist(pb, url, flags, int_cb, options, s->protocol_whitelist, s->protocol_blacklist);
1089 int avio_close(AVIOContext *s)
1091 AVIOInternal *internal;
1098 internal = s->opaque;
1101 av_freep(&s->opaque);
1102 av_freep(&s->buffer);
1104 av_log(s, AV_LOG_DEBUG, "Statistics: %d seeks, %d writeouts\n", s->seek_count, s->writeout_count);
1106 av_log(s, AV_LOG_DEBUG, "Statistics: %"PRId64" bytes read, %d seeks\n", s->bytes_read, s->seek_count);
1109 return ffurl_close(h);
1112 int avio_closep(AVIOContext **s)
1114 int ret = avio_close(*s);
1119 int avio_printf(AVIOContext *s, const char *fmt, ...)
1122 char buf[4096]; /* update doc entry in avio.h if changed */
1126 ret = vsnprintf(buf, sizeof(buf), fmt, ap);
1128 avio_write(s, buf, strlen(buf));
1132 int avio_pause(AVIOContext *s, int pause)
1135 return AVERROR(ENOSYS);
1136 return s->read_pause(s->opaque, pause);
1139 int64_t avio_seek_time(AVIOContext *s, int stream_index,
1140 int64_t timestamp, int flags)
1144 return AVERROR(ENOSYS);
1145 ret = s->read_seek(s->opaque, stream_index, timestamp, flags);
1148 s->buf_ptr = s->buf_end; // Flush buffer
1149 pos = s->seek(s->opaque, 0, SEEK_CUR);
1152 else if (pos != AVERROR(ENOSYS))
1158 int avio_read_to_bprint(AVIOContext *h, AVBPrint *pb, size_t max_size)
1163 ret = avio_read(h, buf, FFMIN(max_size, sizeof(buf)));
1164 if (ret == AVERROR_EOF)
1168 av_bprint_append_data(pb, buf, ret);
1169 if (!av_bprint_is_complete(pb))
1170 return AVERROR(ENOMEM);
1176 int avio_accept(AVIOContext *s, AVIOContext **c)
1179 AVIOInternal *internal = s->opaque;
1180 URLContext *sc = internal->h;
1181 URLContext *cc = NULL;
1182 ret = ffurl_accept(sc, &cc);
1185 return ffio_fdopen(c, cc);
1188 int avio_handshake(AVIOContext *c)
1190 AVIOInternal *internal = c->opaque;
1191 URLContext *cc = internal->h;
1192 return ffurl_handshake(cc);
1195 /* output in a dynamic buffer */
1197 typedef struct DynBuffer {
1198 int pos, size, allocated_size;
1201 uint8_t io_buffer[1];
1204 static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size)
1206 DynBuffer *d = opaque;
1207 unsigned new_size, new_allocated_size;
1209 /* reallocate buffer if needed */
1210 new_size = d->pos + buf_size;
1211 new_allocated_size = d->allocated_size;
1212 if (new_size < d->pos || new_size > INT_MAX/2)
1214 while (new_size > new_allocated_size) {
1215 if (!new_allocated_size)
1216 new_allocated_size = new_size;
1218 new_allocated_size += new_allocated_size / 2 + 1;
1221 if (new_allocated_size > d->allocated_size) {
1223 if ((err = av_reallocp(&d->buffer, new_allocated_size)) < 0) {
1224 d->allocated_size = 0;
1228 d->allocated_size = new_allocated_size;
1230 memcpy(d->buffer + d->pos, buf, buf_size);
1232 if (d->pos > d->size)
1237 static int dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size)
1239 unsigned char buf1[4];
1242 /* packetized write: output the header */
1243 AV_WB32(buf1, buf_size);
1244 ret = dyn_buf_write(opaque, buf1, 4);
1249 return dyn_buf_write(opaque, buf, buf_size);
1252 static int64_t dyn_buf_seek(void *opaque, int64_t offset, int whence)
1254 DynBuffer *d = opaque;
1256 if (whence == SEEK_CUR)
1258 else if (whence == SEEK_END)
1260 if (offset < 0 || offset > 0x7fffffffLL)
1266 static int url_open_dyn_buf_internal(AVIOContext **s, int max_packet_size)
1269 unsigned io_buffer_size = max_packet_size ? max_packet_size : 1024;
1271 if (sizeof(DynBuffer) + io_buffer_size < io_buffer_size)
1273 d = av_mallocz(sizeof(DynBuffer) + io_buffer_size);
1275 return AVERROR(ENOMEM);
1276 d->io_buffer_size = io_buffer_size;
1277 *s = avio_alloc_context(d->io_buffer, d->io_buffer_size, 1, d, NULL,
1278 max_packet_size ? dyn_packet_buf_write : dyn_buf_write,
1279 max_packet_size ? NULL : dyn_buf_seek);
1282 return AVERROR(ENOMEM);
1284 (*s)->max_packet_size = max_packet_size;
1288 int avio_open_dyn_buf(AVIOContext **s)
1290 return url_open_dyn_buf_internal(s, 0);
1293 int ffio_open_dyn_packet_buf(AVIOContext **s, int max_packet_size)
1295 if (max_packet_size <= 0)
1297 return url_open_dyn_buf_internal(s, max_packet_size);
1300 int avio_get_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
1312 *pbuffer = d->buffer;
1317 int avio_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
1321 static const char padbuf[AV_INPUT_BUFFER_PADDING_SIZE] = {0};
1329 /* don't attempt to pad fixed-size packet buffers */
1330 if (!s->max_packet_size) {
1331 avio_write(s, padbuf, sizeof(padbuf));
1332 padding = AV_INPUT_BUFFER_PADDING_SIZE;
1338 *pbuffer = d->buffer;
1342 return size - padding;
1345 void ffio_free_dyn_buf(AVIOContext **s)
1350 avio_close_dyn_buf(*s, &tmp);
1355 static int null_buf_write(void *opaque, uint8_t *buf, int buf_size)
1357 DynBuffer *d = opaque;
1360 if (d->pos > d->size)
1365 int ffio_open_null_buf(AVIOContext **s)
1367 int ret = url_open_dyn_buf_internal(s, 0);
1369 AVIOContext *pb = *s;
1370 pb->write_packet = null_buf_write;
1375 int ffio_close_null_buf(AVIOContext *s)
1377 DynBuffer *d = s->opaque;