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;
128 AVIOContext *avio_alloc_context(
129 unsigned char *buffer,
133 int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
134 int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
135 int64_t (*seek)(void *opaque, int64_t offset, int whence))
137 AVIOContext *s = av_mallocz(sizeof(AVIOContext));
140 ffio_init_context(s, buffer, buffer_size, write_flag, opaque,
141 read_packet, write_packet, seek);
145 static void writeout(AVIOContext *s, const uint8_t *data, int len)
149 if (s->write_data_type)
150 ret = s->write_data_type(s->opaque, (uint8_t *)data,
154 else if (s->write_packet)
155 ret = s->write_packet(s->opaque, (uint8_t *)data, len);
159 if (s->pos + len > s->written)
160 s->written = s->pos + len;
163 if (s->current_type == AVIO_DATA_MARKER_SYNC_POINT ||
164 s->current_type == AVIO_DATA_MARKER_BOUNDARY_POINT) {
165 s->current_type = AVIO_DATA_MARKER_UNKNOWN;
167 s->last_time = AV_NOPTS_VALUE;
168 s->writeout_count ++;
172 static void flush_buffer(AVIOContext *s)
174 if (s->write_flag && s->buf_ptr > s->buffer) {
175 writeout(s, s->buffer, s->buf_ptr - s->buffer);
176 if (s->update_checksum) {
177 s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
178 s->buf_ptr - s->checksum_ptr);
179 s->checksum_ptr = s->buffer;
182 s->buf_ptr = s->buffer;
184 s->buf_end = s->buffer;
187 void avio_w8(AVIOContext *s, int b)
189 av_assert2(b>=-128 && b<=255);
191 if (s->buf_ptr >= s->buf_end)
195 void ffio_fill(AVIOContext *s, int b, int count)
198 int len = FFMIN(s->buf_end - s->buf_ptr, count);
199 memset(s->buf_ptr, b, len);
202 if (s->buf_ptr >= s->buf_end)
209 void avio_write(AVIOContext *s, const unsigned char *buf, int size)
211 if (s->direct && !s->update_checksum) {
213 writeout(s, buf, size);
217 int len = FFMIN(s->buf_end - s->buf_ptr, size);
218 memcpy(s->buf_ptr, buf, len);
221 if (s->buf_ptr >= s->buf_end)
229 void avio_flush(AVIOContext *s)
235 int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
239 int force = whence & AVSEEK_FORCE;
242 whence &= ~AVSEEK_FORCE;
245 return AVERROR(EINVAL);
247 buffer_size = s->buf_end - s->buffer;
248 // pos is the absolute position that the beginning of s->buffer corresponds to in the file
249 pos = s->pos - (s->write_flag ? 0 : buffer_size);
251 if (whence != SEEK_CUR && whence != SEEK_SET)
252 return AVERROR(EINVAL);
254 if (whence == SEEK_CUR) {
255 offset1 = pos + (s->buf_ptr - s->buffer);
261 return AVERROR(EINVAL);
263 if (s->short_seek_get) {
264 short_seek = s->short_seek_get(s->opaque);
265 /* fallback to default short seek */
267 short_seek = s->short_seek_threshold;
269 short_seek = s->short_seek_threshold;
271 offset1 = offset - pos; // "offset1" is the relative offset from the beginning of s->buffer
272 if (!s->must_flush && (!s->direct || !s->seek) &&
273 offset1 >= 0 && offset1 <= buffer_size - s->write_flag) {
274 /* can do the seek inside the buffer */
275 s->buf_ptr = s->buffer + offset1;
276 } else if ((!(s->seekable & AVIO_SEEKABLE_NORMAL) ||
277 offset1 <= buffer_size + short_seek) &&
278 !s->write_flag && offset1 >= 0 &&
279 (!s->direct || !s->seek) &&
280 (whence != SEEK_END || force)) {
281 while(s->pos < offset && !s->eof_reached)
285 s->buf_ptr = s->buf_end - (s->pos - offset);
286 } else if(!s->write_flag && offset1 < 0 && -offset1 < buffer_size>>1 && s->seek && offset > 0) {
289 pos -= FFMIN(buffer_size>>1, pos);
290 if ((res = s->seek(s->opaque, pos, SEEK_SET)) < 0)
293 s->buf_ptr = s->buffer;
297 return avio_seek(s, offset, SEEK_SET | force);
305 return AVERROR(EPIPE);
306 if ((res = s->seek(s->opaque, offset, SEEK_SET)) < 0)
310 s->buf_end = s->buffer;
311 s->buf_ptr = s->buffer;
318 int64_t avio_skip(AVIOContext *s, int64_t offset)
320 return avio_seek(s, offset, SEEK_CUR);
323 int64_t avio_size(AVIOContext *s)
328 return AVERROR(EINVAL);
334 return AVERROR(ENOSYS);
335 size = s->seek(s->opaque, 0, AVSEEK_SIZE);
337 if ((size = s->seek(s->opaque, -1, SEEK_END)) < 0)
340 s->seek(s->opaque, s->pos, SEEK_SET);
345 int avio_feof(AVIOContext *s)
353 return s->eof_reached;
357 int url_feof(AVIOContext *s)
363 void avio_wl32(AVIOContext *s, unsigned int val)
365 avio_w8(s, (uint8_t) val );
366 avio_w8(s, (uint8_t)(val >> 8 ));
367 avio_w8(s, (uint8_t)(val >> 16));
368 avio_w8(s, val >> 24 );
371 void avio_wb32(AVIOContext *s, unsigned int val)
373 avio_w8(s, val >> 24 );
374 avio_w8(s, (uint8_t)(val >> 16));
375 avio_w8(s, (uint8_t)(val >> 8 ));
376 avio_w8(s, (uint8_t) val );
379 int avio_put_str(AVIOContext *s, const char *str)
384 avio_write(s, (const unsigned char *) str, len);
390 static inline int put_str16(AVIOContext *s, const char *str, const int be)
392 const uint8_t *q = str;
400 GET_UTF8(ch, *q++, goto invalid;)
401 PUT_UTF16(ch, tmp, be ? avio_wb16(s, tmp) : avio_wl16(s, tmp);
405 av_log(s, AV_LOG_ERROR, "Invalid UTF8 sequence in avio_put_str16%s\n", be ? "be" : "le");
406 err = AVERROR(EINVAL);
420 #define PUT_STR16(type, big_endian) \
421 int avio_put_str16 ## type(AVIOContext *s, const char *str) \
423 return put_str16(s, str, big_endian); \
431 int ff_get_v_length(uint64_t val)
441 void ff_put_v(AVIOContext *bc, uint64_t val)
443 int i = ff_get_v_length(val);
446 avio_w8(bc, 128 | (uint8_t)(val >> (7*i)));
448 avio_w8(bc, val & 127);
451 void avio_wl64(AVIOContext *s, uint64_t val)
453 avio_wl32(s, (uint32_t)(val & 0xffffffff));
454 avio_wl32(s, (uint32_t)(val >> 32));
457 void avio_wb64(AVIOContext *s, uint64_t val)
459 avio_wb32(s, (uint32_t)(val >> 32));
460 avio_wb32(s, (uint32_t)(val & 0xffffffff));
463 void avio_wl16(AVIOContext *s, unsigned int val)
465 avio_w8(s, (uint8_t)val);
466 avio_w8(s, (int)val >> 8);
469 void avio_wb16(AVIOContext *s, unsigned int val)
471 avio_w8(s, (int)val >> 8);
472 avio_w8(s, (uint8_t)val);
475 void avio_wl24(AVIOContext *s, unsigned int val)
477 avio_wl16(s, val & 0xffff);
478 avio_w8(s, (int)val >> 16);
481 void avio_wb24(AVIOContext *s, unsigned int val)
483 avio_wb16(s, (int)val >> 8);
484 avio_w8(s, (uint8_t)val);
487 void avio_write_marker(AVIOContext *s, int64_t time, enum AVIODataMarkerType type)
489 if (!s->write_data_type)
491 // If ignoring boundary points, just treat it as unknown
492 if (type == AVIO_DATA_MARKER_BOUNDARY_POINT && s->ignore_boundary_point)
493 type = AVIO_DATA_MARKER_UNKNOWN;
494 // Avoid unnecessary flushes if we are already in non-header/trailer
495 // data and setting the type to unknown
496 if (type == AVIO_DATA_MARKER_UNKNOWN &&
497 (s->current_type != AVIO_DATA_MARKER_HEADER &&
498 s->current_type != AVIO_DATA_MARKER_TRAILER))
502 case AVIO_DATA_MARKER_HEADER:
503 case AVIO_DATA_MARKER_TRAILER:
504 // For header/trailer, ignore a new marker of the same type;
505 // consecutive header/trailer markers can be merged.
506 if (type == s->current_type)
511 // If we've reached here, we have a new, noteworthy marker.
512 // Flush the previous data and mark the start of the new data.
514 s->current_type = type;
520 static void fill_buffer(AVIOContext *s)
522 int max_buffer_size = s->max_packet_size ?
523 s->max_packet_size : IO_BUFFER_SIZE;
524 uint8_t *dst = s->buf_end - s->buffer + max_buffer_size < s->buffer_size ?
525 s->buf_end : s->buffer;
526 int len = s->buffer_size - (dst - s->buffer);
528 /* can't fill the buffer without read_packet, just set EOF if appropriate */
529 if (!s->read_packet && s->buf_ptr >= s->buf_end)
532 /* no need to do anything if EOF already reached */
536 if (s->update_checksum && dst == s->buffer) {
537 if (s->buf_end > s->checksum_ptr)
538 s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
539 s->buf_end - s->checksum_ptr);
540 s->checksum_ptr = s->buffer;
543 /* make buffer smaller in case it ended up large after probing */
544 if (s->read_packet && s->orig_buffer_size && s->buffer_size > s->orig_buffer_size) {
545 if (dst == s->buffer) {
546 int ret = ffio_set_buf_size(s, s->orig_buffer_size);
548 av_log(s, AV_LOG_WARNING, "Failed to decrease buffer size\n");
550 s->checksum_ptr = dst = s->buffer;
552 av_assert0(len >= s->orig_buffer_size);
553 len = s->orig_buffer_size;
557 len = s->read_packet(s->opaque, dst, len);
561 /* do not modify buffer if EOF reached so that a seek back can
562 be done without rereading data */
569 s->buf_end = dst + len;
570 s->bytes_read += len;
574 unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf,
577 return av_crc(av_crc_get_table(AV_CRC_32_IEEE), checksum, buf, len);
580 unsigned long ff_crcEDB88320_update(unsigned long checksum, const uint8_t *buf,
583 return av_crc(av_crc_get_table(AV_CRC_32_IEEE_LE), checksum, buf, len);
586 unsigned long ff_crcA001_update(unsigned long checksum, const uint8_t *buf,
589 return av_crc(av_crc_get_table(AV_CRC_16_ANSI_LE), checksum, buf, len);
592 unsigned long ffio_get_checksum(AVIOContext *s)
594 s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
595 s->buf_ptr - s->checksum_ptr);
596 s->update_checksum = NULL;
600 void ffio_init_checksum(AVIOContext *s,
601 unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len),
602 unsigned long checksum)
604 s->update_checksum = update_checksum;
605 if (s->update_checksum) {
606 s->checksum = checksum;
607 s->checksum_ptr = s->buf_ptr;
611 /* XXX: put an inline version */
612 int avio_r8(AVIOContext *s)
614 if (s->buf_ptr >= s->buf_end)
616 if (s->buf_ptr < s->buf_end)
617 return *s->buf_ptr++;
621 int avio_read(AVIOContext *s, unsigned char *buf, int size)
627 len = FFMIN(s->buf_end - s->buf_ptr, size);
628 if (len == 0 || s->write_flag) {
629 if((s->direct || size > s->buffer_size) && !s->update_checksum) {
630 // bypass the buffer and read data directly into buf
632 len = s->read_packet(s->opaque, buf, size);
635 /* do not modify buffer if EOF reached so that a seek back can
636 be done without rereading data */
643 s->bytes_read += len;
647 s->buf_ptr = s->buffer;
648 s->buf_end = s->buffer/* + len*/;
652 len = s->buf_end - s->buf_ptr;
657 memcpy(buf, s->buf_ptr, len);
664 if (s->error) return s->error;
665 if (avio_feof(s)) return AVERROR_EOF;
670 int ffio_read_size(AVIOContext *s, unsigned char *buf, int size)
672 int ret = avio_read(s, buf, size);
674 return AVERROR_INVALIDDATA;
678 int ffio_read_indirect(AVIOContext *s, unsigned char *buf, int size, const unsigned char **data)
680 if (s->buf_end - s->buf_ptr >= size && !s->write_flag) {
686 return avio_read(s, buf, size);
690 int ffio_read_partial(AVIOContext *s, unsigned char *buf, int size)
697 if (s->read_packet && s->write_flag) {
698 len = s->read_packet(s->opaque, buf, size);
704 len = s->buf_end - s->buf_ptr;
706 /* Reset the buf_end pointer to the start of the buffer, to make sure
707 * the fill_buffer call tries to read as much data as fits into the
708 * full buffer, instead of just what space is left after buf_end.
709 * This avoids returning partial packets at the end of the buffer,
710 * for packet based inputs.
712 s->buf_end = s->buf_ptr = s->buffer;
714 len = s->buf_end - s->buf_ptr;
718 memcpy(buf, s->buf_ptr, len);
721 if (s->error) return s->error;
722 if (avio_feof(s)) return AVERROR_EOF;
727 unsigned int avio_rl16(AVIOContext *s)
731 val |= avio_r8(s) << 8;
735 unsigned int avio_rl24(AVIOContext *s)
739 val |= avio_r8(s) << 16;
743 unsigned int avio_rl32(AVIOContext *s)
747 val |= avio_rl16(s) << 16;
751 uint64_t avio_rl64(AVIOContext *s)
754 val = (uint64_t)avio_rl32(s);
755 val |= (uint64_t)avio_rl32(s) << 32;
759 unsigned int avio_rb16(AVIOContext *s)
762 val = avio_r8(s) << 8;
767 unsigned int avio_rb24(AVIOContext *s)
770 val = avio_rb16(s) << 8;
774 unsigned int avio_rb32(AVIOContext *s)
777 val = avio_rb16(s) << 16;
782 int ff_get_line(AVIOContext *s, char *buf, int maxlen)
789 if (c && i < maxlen-1)
791 } while (c != '\n' && c != '\r' && c);
792 if (c == '\r' && avio_r8(s) != '\n' && !avio_feof(s))
799 int avio_get_str(AVIOContext *s, int maxlen, char *buf, int buflen)
804 return AVERROR(EINVAL);
805 // reserve 1 byte for terminating 0
806 buflen = FFMIN(buflen - 1, maxlen);
807 for (i = 0; i < buflen; i++)
808 if (!(buf[i] = avio_r8(s)))
811 for (; i < maxlen; i++)
817 #define GET_STR16(type, read) \
818 int avio_get_str16 ##type(AVIOContext *pb, int maxlen, char *buf, int buflen)\
823 return AVERROR(EINVAL); \
824 while (ret + 1 < maxlen) {\
827 GET_UTF16(ch, (ret += 2) <= maxlen ? read(pb) : 0, break;)\
830 PUT_UTF8(ch, tmp, if (q - buf < buflen - 1) *q++ = tmp;)\
836 GET_STR16(le, avio_rl16)
837 GET_STR16(be, avio_rb16)
841 uint64_t avio_rb64(AVIOContext *s)
844 val = (uint64_t)avio_rb32(s) << 32;
845 val |= (uint64_t)avio_rb32(s);
849 uint64_t ffio_read_varlen(AVIOContext *bc){
855 val= (val<<7) + (tmp&127);
860 static int io_read_packet(void *opaque, uint8_t *buf, int buf_size)
862 AVIOInternal *internal = opaque;
863 return ffurl_read(internal->h, buf, buf_size);
866 static int io_write_packet(void *opaque, uint8_t *buf, int buf_size)
868 AVIOInternal *internal = opaque;
869 return ffurl_write(internal->h, buf, buf_size);
872 static int64_t io_seek(void *opaque, int64_t offset, int whence)
874 AVIOInternal *internal = opaque;
875 return ffurl_seek(internal->h, offset, whence);
878 static int io_short_seek(void *opaque)
880 AVIOInternal *internal = opaque;
881 return ffurl_get_short_seek(internal->h);
884 static int io_read_pause(void *opaque, int pause)
886 AVIOInternal *internal = opaque;
887 if (!internal->h->prot->url_read_pause)
888 return AVERROR(ENOSYS);
889 return internal->h->prot->url_read_pause(internal->h, pause);
892 static int64_t io_read_seek(void *opaque, int stream_index, int64_t timestamp, int flags)
894 AVIOInternal *internal = opaque;
895 if (!internal->h->prot->url_read_seek)
896 return AVERROR(ENOSYS);
897 return internal->h->prot->url_read_seek(internal->h, stream_index, timestamp, flags);
900 int ffio_fdopen(AVIOContext **s, URLContext *h)
902 AVIOInternal *internal = NULL;
903 uint8_t *buffer = NULL;
904 int buffer_size, max_packet_size;
906 max_packet_size = h->max_packet_size;
907 if (max_packet_size) {
908 buffer_size = max_packet_size; /* no need to bufferize more than one packet */
910 buffer_size = IO_BUFFER_SIZE;
912 buffer = av_malloc(buffer_size);
914 return AVERROR(ENOMEM);
916 internal = av_mallocz(sizeof(*internal));
922 *s = avio_alloc_context(buffer, buffer_size, h->flags & AVIO_FLAG_WRITE,
923 internal, io_read_packet, io_write_packet, io_seek);
927 (*s)->protocol_whitelist = av_strdup(h->protocol_whitelist);
928 if (!(*s)->protocol_whitelist && h->protocol_whitelist) {
932 (*s)->protocol_blacklist = av_strdup(h->protocol_blacklist);
933 if (!(*s)->protocol_blacklist && h->protocol_blacklist) {
937 (*s)->direct = h->flags & AVIO_FLAG_DIRECT;
939 (*s)->seekable = h->is_streamed ? 0 : AVIO_SEEKABLE_NORMAL;
940 (*s)->max_packet_size = max_packet_size;
942 (*s)->read_pause = io_read_pause;
943 (*s)->read_seek = io_read_seek;
945 if (h->prot->url_read_seek)
946 (*s)->seekable |= AVIO_SEEKABLE_TIME;
948 (*s)->short_seek_get = io_short_seek;
949 (*s)->av_class = &ff_avio_class;
954 return AVERROR(ENOMEM);
957 int ffio_ensure_seekback(AVIOContext *s, int64_t buf_size)
960 int max_buffer_size = s->max_packet_size ?
961 s->max_packet_size : IO_BUFFER_SIZE;
962 int filled = s->buf_end - s->buffer;
963 ptrdiff_t checksum_ptr_offset = s->checksum_ptr ? s->checksum_ptr - s->buffer : -1;
965 buf_size += s->buf_ptr - s->buffer + max_buffer_size;
967 if (buf_size < filled || s->seekable || !s->read_packet)
969 av_assert0(!s->write_flag);
971 buffer = av_malloc(buf_size);
973 return AVERROR(ENOMEM);
975 memcpy(buffer, s->buffer, filled);
977 s->buf_ptr = buffer + (s->buf_ptr - s->buffer);
978 s->buf_end = buffer + (s->buf_end - s->buffer);
980 s->buffer_size = buf_size;
981 if (checksum_ptr_offset >= 0)
982 s->checksum_ptr = s->buffer + checksum_ptr_offset;
986 int ffio_set_buf_size(AVIOContext *s, int buf_size)
989 buffer = av_malloc(buf_size);
991 return AVERROR(ENOMEM);
995 s->orig_buffer_size =
996 s->buffer_size = buf_size;
998 url_resetbuf(s, s->write_flag ? AVIO_FLAG_WRITE : AVIO_FLAG_READ);
1002 static int url_resetbuf(AVIOContext *s, int flags)
1004 av_assert1(flags == AVIO_FLAG_WRITE || flags == AVIO_FLAG_READ);
1006 if (flags & AVIO_FLAG_WRITE) {
1007 s->buf_end = s->buffer + s->buffer_size;
1010 s->buf_end = s->buffer;
1016 int ffio_rewind_with_probe_data(AVIOContext *s, unsigned char **bufp, int buf_size)
1018 int64_t buffer_start;
1020 int overlap, new_size, alloc_size;
1021 uint8_t *buf = *bufp;
1023 if (s->write_flag) {
1025 return AVERROR(EINVAL);
1028 buffer_size = s->buf_end - s->buffer;
1030 /* the buffers must touch or overlap */
1031 if ((buffer_start = s->pos - buffer_size) > buf_size) {
1033 return AVERROR(EINVAL);
1036 overlap = buf_size - buffer_start;
1037 new_size = buf_size + buffer_size - overlap;
1039 alloc_size = FFMAX(s->buffer_size, new_size);
1040 if (alloc_size > buf_size)
1041 if (!(buf = (*bufp) = av_realloc_f(buf, 1, alloc_size)))
1042 return AVERROR(ENOMEM);
1044 if (new_size > buf_size) {
1045 memcpy(buf + buf_size, s->buffer + overlap, buffer_size - overlap);
1046 buf_size = new_size;
1050 s->buf_ptr = s->buffer = buf;
1051 s->buffer_size = alloc_size;
1053 s->buf_end = s->buf_ptr + buf_size;
1060 int avio_open(AVIOContext **s, const char *filename, int flags)
1062 return avio_open2(s, filename, flags, NULL, NULL);
1065 int ffio_open_whitelist(AVIOContext **s, const char *filename, int flags,
1066 const AVIOInterruptCB *int_cb, AVDictionary **options,
1067 const char *whitelist, const char *blacklist
1073 err = ffurl_open_whitelist(&h, filename, flags, int_cb, options, whitelist, blacklist, NULL);
1076 err = ffio_fdopen(s, h);
1084 int avio_open2(AVIOContext **s, const char *filename, int flags,
1085 const AVIOInterruptCB *int_cb, AVDictionary **options)
1087 return ffio_open_whitelist(s, filename, flags, int_cb, options, NULL, NULL);
1090 int ffio_open2_wrapper(struct AVFormatContext *s, AVIOContext **pb, const char *url, int flags,
1091 const AVIOInterruptCB *int_cb, AVDictionary **options)
1093 return ffio_open_whitelist(pb, url, flags, int_cb, options, s->protocol_whitelist, s->protocol_blacklist);
1096 int avio_close(AVIOContext *s)
1098 AVIOInternal *internal;
1105 internal = s->opaque;
1108 av_freep(&s->opaque);
1109 av_freep(&s->buffer);
1111 av_log(s, AV_LOG_DEBUG, "Statistics: %d seeks, %d writeouts\n", s->seek_count, s->writeout_count);
1113 av_log(s, AV_LOG_DEBUG, "Statistics: %"PRId64" bytes read, %d seeks\n", s->bytes_read, s->seek_count);
1116 return ffurl_close(h);
1119 int avio_closep(AVIOContext **s)
1121 int ret = avio_close(*s);
1126 int avio_printf(AVIOContext *s, const char *fmt, ...)
1129 char buf[4096]; /* update doc entry in avio.h if changed */
1133 ret = vsnprintf(buf, sizeof(buf), fmt, ap);
1135 avio_write(s, buf, strlen(buf));
1139 int avio_pause(AVIOContext *s, int pause)
1142 return AVERROR(ENOSYS);
1143 return s->read_pause(s->opaque, pause);
1146 int64_t avio_seek_time(AVIOContext *s, int stream_index,
1147 int64_t timestamp, int flags)
1151 return AVERROR(ENOSYS);
1152 ret = s->read_seek(s->opaque, stream_index, timestamp, flags);
1155 s->buf_ptr = s->buf_end; // Flush buffer
1156 pos = s->seek(s->opaque, 0, SEEK_CUR);
1159 else if (pos != AVERROR(ENOSYS))
1165 int avio_read_to_bprint(AVIOContext *h, AVBPrint *pb, size_t max_size)
1170 ret = avio_read(h, buf, FFMIN(max_size, sizeof(buf)));
1171 if (ret == AVERROR_EOF)
1175 av_bprint_append_data(pb, buf, ret);
1176 if (!av_bprint_is_complete(pb))
1177 return AVERROR(ENOMEM);
1183 int avio_accept(AVIOContext *s, AVIOContext **c)
1186 AVIOInternal *internal = s->opaque;
1187 URLContext *sc = internal->h;
1188 URLContext *cc = NULL;
1189 ret = ffurl_accept(sc, &cc);
1192 return ffio_fdopen(c, cc);
1195 int avio_handshake(AVIOContext *c)
1197 AVIOInternal *internal = c->opaque;
1198 URLContext *cc = internal->h;
1199 return ffurl_handshake(cc);
1202 /* output in a dynamic buffer */
1204 typedef struct DynBuffer {
1205 int pos, size, allocated_size;
1208 uint8_t io_buffer[1];
1211 static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size)
1213 DynBuffer *d = opaque;
1214 unsigned new_size, new_allocated_size;
1216 /* reallocate buffer if needed */
1217 new_size = d->pos + buf_size;
1218 new_allocated_size = d->allocated_size;
1219 if (new_size < d->pos || new_size > INT_MAX/2)
1221 while (new_size > new_allocated_size) {
1222 if (!new_allocated_size)
1223 new_allocated_size = new_size;
1225 new_allocated_size += new_allocated_size / 2 + 1;
1228 if (new_allocated_size > d->allocated_size) {
1230 if ((err = av_reallocp(&d->buffer, new_allocated_size)) < 0) {
1231 d->allocated_size = 0;
1235 d->allocated_size = new_allocated_size;
1237 memcpy(d->buffer + d->pos, buf, buf_size);
1239 if (d->pos > d->size)
1244 static int dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size)
1246 unsigned char buf1[4];
1249 /* packetized write: output the header */
1250 AV_WB32(buf1, buf_size);
1251 ret = dyn_buf_write(opaque, buf1, 4);
1256 return dyn_buf_write(opaque, buf, buf_size);
1259 static int64_t dyn_buf_seek(void *opaque, int64_t offset, int whence)
1261 DynBuffer *d = opaque;
1263 if (whence == SEEK_CUR)
1265 else if (whence == SEEK_END)
1267 if (offset < 0 || offset > 0x7fffffffLL)
1273 static int url_open_dyn_buf_internal(AVIOContext **s, int max_packet_size)
1276 unsigned io_buffer_size = max_packet_size ? max_packet_size : 1024;
1278 if (sizeof(DynBuffer) + io_buffer_size < io_buffer_size)
1280 d = av_mallocz(sizeof(DynBuffer) + io_buffer_size);
1282 return AVERROR(ENOMEM);
1283 d->io_buffer_size = io_buffer_size;
1284 *s = avio_alloc_context(d->io_buffer, d->io_buffer_size, 1, d, NULL,
1285 max_packet_size ? dyn_packet_buf_write : dyn_buf_write,
1286 max_packet_size ? NULL : dyn_buf_seek);
1289 return AVERROR(ENOMEM);
1291 (*s)->max_packet_size = max_packet_size;
1295 int avio_open_dyn_buf(AVIOContext **s)
1297 return url_open_dyn_buf_internal(s, 0);
1300 int ffio_open_dyn_packet_buf(AVIOContext **s, int max_packet_size)
1302 if (max_packet_size <= 0)
1304 return url_open_dyn_buf_internal(s, max_packet_size);
1307 int avio_get_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
1319 *pbuffer = d->buffer;
1324 int avio_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
1328 static const char padbuf[AV_INPUT_BUFFER_PADDING_SIZE] = {0};
1336 /* don't attempt to pad fixed-size packet buffers */
1337 if (!s->max_packet_size) {
1338 avio_write(s, padbuf, sizeof(padbuf));
1339 padding = AV_INPUT_BUFFER_PADDING_SIZE;
1345 *pbuffer = d->buffer;
1349 return size - padding;
1352 void ffio_free_dyn_buf(AVIOContext **s)
1357 avio_close_dyn_buf(*s, &tmp);
1362 static int null_buf_write(void *opaque, uint8_t *buf, int buf_size)
1364 DynBuffer *d = opaque;
1367 if (d->pos > d->size)
1372 int ffio_open_null_buf(AVIOContext **s)
1374 int ret = url_open_dyn_buf_internal(s, 0);
1376 AVIOContext *pb = *s;
1377 pb->write_packet = null_buf_write;
1382 int ffio_close_null_buf(AVIOContext *s)
1384 DynBuffer *d = s->opaque;