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;
126 AVIOContext *avio_alloc_context(
127 unsigned char *buffer,
131 int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
132 int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
133 int64_t (*seek)(void *opaque, int64_t offset, int whence))
135 AVIOContext *s = av_mallocz(sizeof(AVIOContext));
138 ffio_init_context(s, buffer, buffer_size, write_flag, opaque,
139 read_packet, write_packet, seek);
143 static void writeout(AVIOContext *s, const uint8_t *data, int len)
147 if (s->write_data_type)
148 ret = s->write_data_type(s->opaque, (uint8_t *)data,
152 else if (s->write_packet)
153 ret = s->write_packet(s->opaque, (uint8_t *)data, len);
158 if (s->current_type == AVIO_DATA_MARKER_SYNC_POINT ||
159 s->current_type == AVIO_DATA_MARKER_BOUNDARY_POINT) {
160 s->current_type = AVIO_DATA_MARKER_UNKNOWN;
162 s->last_time = AV_NOPTS_VALUE;
163 s->writeout_count ++;
167 static void flush_buffer(AVIOContext *s)
169 if (s->write_flag && s->buf_ptr > s->buffer) {
170 writeout(s, s->buffer, s->buf_ptr - s->buffer);
171 if (s->update_checksum) {
172 s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
173 s->buf_ptr - s->checksum_ptr);
174 s->checksum_ptr = s->buffer;
177 s->buf_ptr = s->buffer;
179 s->buf_end = s->buffer;
182 void avio_w8(AVIOContext *s, int b)
184 av_assert2(b>=-128 && b<=255);
186 if (s->buf_ptr >= s->buf_end)
190 void ffio_fill(AVIOContext *s, int b, int count)
193 int len = FFMIN(s->buf_end - s->buf_ptr, count);
194 memset(s->buf_ptr, b, len);
197 if (s->buf_ptr >= s->buf_end)
204 void avio_write(AVIOContext *s, const unsigned char *buf, int size)
206 if (s->direct && !s->update_checksum) {
208 writeout(s, buf, size);
212 int len = FFMIN(s->buf_end - s->buf_ptr, size);
213 memcpy(s->buf_ptr, buf, len);
216 if (s->buf_ptr >= s->buf_end)
224 void avio_flush(AVIOContext *s)
230 int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
234 int force = whence & AVSEEK_FORCE;
236 whence &= ~AVSEEK_FORCE;
239 return AVERROR(EINVAL);
241 buffer_size = s->buf_end - s->buffer;
242 // pos is the absolute position that the beginning of s->buffer corresponds to in the file
243 pos = s->pos - (s->write_flag ? 0 : buffer_size);
245 if (whence != SEEK_CUR && whence != SEEK_SET)
246 return AVERROR(EINVAL);
248 if (whence == SEEK_CUR) {
249 offset1 = pos + (s->buf_ptr - s->buffer);
255 return AVERROR(EINVAL);
257 offset1 = offset - pos; // "offset1" is the relative offset from the beginning of s->buffer
258 if (!s->must_flush && (!s->direct || !s->seek) &&
259 offset1 >= 0 && offset1 <= buffer_size - s->write_flag) {
260 /* can do the seek inside the buffer */
261 s->buf_ptr = s->buffer + offset1;
262 } else if ((!s->seekable ||
263 offset1 <= buffer_size + s->short_seek_threshold) &&
264 !s->write_flag && offset1 >= 0 &&
265 (!s->direct || !s->seek) &&
266 (whence != SEEK_END || force)) {
267 while(s->pos < offset && !s->eof_reached)
271 s->buf_ptr = s->buf_end - (s->pos - offset);
272 } else if(!s->write_flag && offset1 < 0 && -offset1 < buffer_size>>1 && s->seek && offset > 0) {
275 pos -= FFMIN(buffer_size>>1, pos);
276 if ((res = s->seek(s->opaque, pos, SEEK_SET)) < 0)
279 s->buf_ptr = s->buffer;
283 return avio_seek(s, offset, SEEK_SET | force);
291 return AVERROR(EPIPE);
292 if ((res = s->seek(s->opaque, offset, SEEK_SET)) < 0)
296 s->buf_end = s->buffer;
297 s->buf_ptr = s->buffer;
304 int64_t avio_skip(AVIOContext *s, int64_t offset)
306 return avio_seek(s, offset, SEEK_CUR);
309 int64_t avio_size(AVIOContext *s)
314 return AVERROR(EINVAL);
317 return AVERROR(ENOSYS);
318 size = s->seek(s->opaque, 0, AVSEEK_SIZE);
320 if ((size = s->seek(s->opaque, -1, SEEK_END)) < 0)
323 s->seek(s->opaque, s->pos, SEEK_SET);
328 int avio_feof(AVIOContext *s)
336 return s->eof_reached;
340 int url_feof(AVIOContext *s)
346 void avio_wl32(AVIOContext *s, unsigned int val)
348 avio_w8(s, (uint8_t) val );
349 avio_w8(s, (uint8_t)(val >> 8 ));
350 avio_w8(s, (uint8_t)(val >> 16));
351 avio_w8(s, val >> 24 );
354 void avio_wb32(AVIOContext *s, unsigned int val)
356 avio_w8(s, val >> 24 );
357 avio_w8(s, (uint8_t)(val >> 16));
358 avio_w8(s, (uint8_t)(val >> 8 ));
359 avio_w8(s, (uint8_t) val );
362 int avio_put_str(AVIOContext *s, const char *str)
367 avio_write(s, (const unsigned char *) str, len);
373 static inline int put_str16(AVIOContext *s, const char *str, const int be)
375 const uint8_t *q = str;
383 GET_UTF8(ch, *q++, goto invalid;)
384 PUT_UTF16(ch, tmp, be ? avio_wb16(s, tmp) : avio_wl16(s, tmp);
388 av_log(s, AV_LOG_ERROR, "Invalid UTF8 sequence in avio_put_str16%s\n", be ? "be" : "le");
389 err = AVERROR(EINVAL);
403 #define PUT_STR16(type, big_endian) \
404 int avio_put_str16 ## type(AVIOContext *s, const char *str) \
406 return put_str16(s, str, big_endian); \
414 int ff_get_v_length(uint64_t val)
424 void ff_put_v(AVIOContext *bc, uint64_t val)
426 int i = ff_get_v_length(val);
429 avio_w8(bc, 128 | (uint8_t)(val >> (7*i)));
431 avio_w8(bc, val & 127);
434 void avio_wl64(AVIOContext *s, uint64_t val)
436 avio_wl32(s, (uint32_t)(val & 0xffffffff));
437 avio_wl32(s, (uint32_t)(val >> 32));
440 void avio_wb64(AVIOContext *s, uint64_t val)
442 avio_wb32(s, (uint32_t)(val >> 32));
443 avio_wb32(s, (uint32_t)(val & 0xffffffff));
446 void avio_wl16(AVIOContext *s, unsigned int val)
448 avio_w8(s, (uint8_t)val);
449 avio_w8(s, (int)val >> 8);
452 void avio_wb16(AVIOContext *s, unsigned int val)
454 avio_w8(s, (int)val >> 8);
455 avio_w8(s, (uint8_t)val);
458 void avio_wl24(AVIOContext *s, unsigned int val)
460 avio_wl16(s, val & 0xffff);
461 avio_w8(s, (int)val >> 16);
464 void avio_wb24(AVIOContext *s, unsigned int val)
466 avio_wb16(s, (int)val >> 8);
467 avio_w8(s, (uint8_t)val);
470 void avio_write_marker(AVIOContext *s, int64_t time, enum AVIODataMarkerType type)
472 if (!s->write_data_type)
474 // If ignoring boundary points, just treat it as unknown
475 if (type == AVIO_DATA_MARKER_BOUNDARY_POINT && s->ignore_boundary_point)
476 type = AVIO_DATA_MARKER_UNKNOWN;
477 // Avoid unnecessary flushes if we are already in non-header/trailer
478 // data and setting the type to unknown
479 if (type == AVIO_DATA_MARKER_UNKNOWN &&
480 (s->current_type != AVIO_DATA_MARKER_HEADER &&
481 s->current_type != AVIO_DATA_MARKER_TRAILER))
485 case AVIO_DATA_MARKER_HEADER:
486 case AVIO_DATA_MARKER_TRAILER:
487 // For header/trailer, ignore a new marker of the same type;
488 // consecutive header/trailer markers can be merged.
489 if (type == s->current_type)
494 // If we've reached here, we have a new, noteworthy marker.
495 // Flush the previous data and mark the start of the new data.
497 s->current_type = type;
503 static void fill_buffer(AVIOContext *s)
505 int max_buffer_size = s->max_packet_size ?
506 s->max_packet_size : IO_BUFFER_SIZE;
507 uint8_t *dst = s->buf_end - s->buffer + max_buffer_size < s->buffer_size ?
508 s->buf_end : s->buffer;
509 int len = s->buffer_size - (dst - s->buffer);
511 /* can't fill the buffer without read_packet, just set EOF if appropriate */
512 if (!s->read_packet && s->buf_ptr >= s->buf_end)
515 /* no need to do anything if EOF already reached */
519 if (s->update_checksum && dst == s->buffer) {
520 if (s->buf_end > s->checksum_ptr)
521 s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
522 s->buf_end - s->checksum_ptr);
523 s->checksum_ptr = s->buffer;
526 /* make buffer smaller in case it ended up large after probing */
527 if (s->read_packet && s->orig_buffer_size && s->buffer_size > s->orig_buffer_size) {
528 if (dst == s->buffer) {
529 int ret = ffio_set_buf_size(s, s->orig_buffer_size);
531 av_log(s, AV_LOG_WARNING, "Failed to decrease buffer size\n");
533 s->checksum_ptr = dst = s->buffer;
535 av_assert0(len >= s->orig_buffer_size);
536 len = s->orig_buffer_size;
540 len = s->read_packet(s->opaque, dst, len);
544 /* do not modify buffer if EOF reached so that a seek back can
545 be done without rereading data */
552 s->buf_end = dst + len;
553 s->bytes_read += len;
557 unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf,
560 return av_crc(av_crc_get_table(AV_CRC_32_IEEE), checksum, buf, len);
563 unsigned long ff_crcEDB88320_update(unsigned long checksum, const uint8_t *buf,
566 return av_crc(av_crc_get_table(AV_CRC_32_IEEE_LE), checksum, buf, len);
569 unsigned long ff_crcA001_update(unsigned long checksum, const uint8_t *buf,
572 return av_crc(av_crc_get_table(AV_CRC_16_ANSI_LE), checksum, buf, len);
575 unsigned long ffio_get_checksum(AVIOContext *s)
577 s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
578 s->buf_ptr - s->checksum_ptr);
579 s->update_checksum = NULL;
583 void ffio_init_checksum(AVIOContext *s,
584 unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len),
585 unsigned long checksum)
587 s->update_checksum = update_checksum;
588 if (s->update_checksum) {
589 s->checksum = checksum;
590 s->checksum_ptr = s->buf_ptr;
594 /* XXX: put an inline version */
595 int avio_r8(AVIOContext *s)
597 if (s->buf_ptr >= s->buf_end)
599 if (s->buf_ptr < s->buf_end)
600 return *s->buf_ptr++;
604 int avio_read(AVIOContext *s, unsigned char *buf, int size)
610 len = FFMIN(s->buf_end - s->buf_ptr, size);
611 if (len == 0 || s->write_flag) {
612 if((s->direct || size > s->buffer_size) && !s->update_checksum) {
613 // bypass the buffer and read data directly into buf
615 len = s->read_packet(s->opaque, buf, size);
618 /* do not modify buffer if EOF reached so that a seek back can
619 be done without rereading data */
626 s->bytes_read += len;
630 s->buf_ptr = s->buffer;
631 s->buf_end = s->buffer/* + len*/;
635 len = s->buf_end - s->buf_ptr;
640 memcpy(buf, s->buf_ptr, len);
647 if (s->error) return s->error;
648 if (avio_feof(s)) return AVERROR_EOF;
653 int ffio_read_size(AVIOContext *s, unsigned char *buf, int size)
655 int ret = avio_read(s, buf, size);
657 return AVERROR_INVALIDDATA;
661 int ffio_read_indirect(AVIOContext *s, unsigned char *buf, int size, const unsigned char **data)
663 if (s->buf_end - s->buf_ptr >= size && !s->write_flag) {
669 return avio_read(s, buf, size);
673 int ffio_read_partial(AVIOContext *s, unsigned char *buf, int size)
680 if (s->read_packet && s->write_flag) {
681 len = s->read_packet(s->opaque, buf, size);
687 len = s->buf_end - s->buf_ptr;
689 /* Reset the buf_end pointer to the start of the buffer, to make sure
690 * the fill_buffer call tries to read as much data as fits into the
691 * full buffer, instead of just what space is left after buf_end.
692 * This avoids returning partial packets at the end of the buffer,
693 * for packet based inputs.
695 s->buf_end = s->buf_ptr = s->buffer;
697 len = s->buf_end - s->buf_ptr;
701 memcpy(buf, s->buf_ptr, len);
704 if (s->error) return s->error;
705 if (avio_feof(s)) return AVERROR_EOF;
710 unsigned int avio_rl16(AVIOContext *s)
714 val |= avio_r8(s) << 8;
718 unsigned int avio_rl24(AVIOContext *s)
722 val |= avio_r8(s) << 16;
726 unsigned int avio_rl32(AVIOContext *s)
730 val |= avio_rl16(s) << 16;
734 uint64_t avio_rl64(AVIOContext *s)
737 val = (uint64_t)avio_rl32(s);
738 val |= (uint64_t)avio_rl32(s) << 32;
742 unsigned int avio_rb16(AVIOContext *s)
745 val = avio_r8(s) << 8;
750 unsigned int avio_rb24(AVIOContext *s)
753 val = avio_rb16(s) << 8;
757 unsigned int avio_rb32(AVIOContext *s)
760 val = avio_rb16(s) << 16;
765 int ff_get_line(AVIOContext *s, char *buf, int maxlen)
772 if (c && i < maxlen-1)
774 } while (c != '\n' && c != '\r' && c);
775 if (c == '\r' && avio_r8(s) != '\n' && !avio_feof(s))
782 int avio_get_str(AVIOContext *s, int maxlen, char *buf, int buflen)
787 return AVERROR(EINVAL);
788 // reserve 1 byte for terminating 0
789 buflen = FFMIN(buflen - 1, maxlen);
790 for (i = 0; i < buflen; i++)
791 if (!(buf[i] = avio_r8(s)))
794 for (; i < maxlen; i++)
800 #define GET_STR16(type, read) \
801 int avio_get_str16 ##type(AVIOContext *pb, int maxlen, char *buf, int buflen)\
806 return AVERROR(EINVAL); \
807 while (ret + 1 < maxlen) {\
810 GET_UTF16(ch, (ret += 2) <= maxlen ? read(pb) : 0, break;)\
813 PUT_UTF8(ch, tmp, if (q - buf < buflen - 1) *q++ = tmp;)\
819 GET_STR16(le, avio_rl16)
820 GET_STR16(be, avio_rb16)
824 uint64_t avio_rb64(AVIOContext *s)
827 val = (uint64_t)avio_rb32(s) << 32;
828 val |= (uint64_t)avio_rb32(s);
832 uint64_t ffio_read_varlen(AVIOContext *bc){
838 val= (val<<7) + (tmp&127);
843 static int io_read_packet(void *opaque, uint8_t *buf, int buf_size)
845 AVIOInternal *internal = opaque;
846 return ffurl_read(internal->h, buf, buf_size);
849 static int io_write_packet(void *opaque, uint8_t *buf, int buf_size)
851 AVIOInternal *internal = opaque;
852 return ffurl_write(internal->h, buf, buf_size);
855 static int64_t io_seek(void *opaque, int64_t offset, int whence)
857 AVIOInternal *internal = opaque;
858 return ffurl_seek(internal->h, offset, whence);
861 static int io_read_pause(void *opaque, int pause)
863 AVIOInternal *internal = opaque;
864 if (!internal->h->prot->url_read_pause)
865 return AVERROR(ENOSYS);
866 return internal->h->prot->url_read_pause(internal->h, pause);
869 static int64_t io_read_seek(void *opaque, int stream_index, int64_t timestamp, int flags)
871 AVIOInternal *internal = opaque;
872 if (!internal->h->prot->url_read_seek)
873 return AVERROR(ENOSYS);
874 return internal->h->prot->url_read_seek(internal->h, stream_index, timestamp, flags);
877 int ffio_fdopen(AVIOContext **s, URLContext *h)
879 AVIOInternal *internal = NULL;
880 uint8_t *buffer = NULL;
881 int buffer_size, max_packet_size;
883 max_packet_size = h->max_packet_size;
884 if (max_packet_size) {
885 buffer_size = max_packet_size; /* no need to bufferize more than one packet */
887 buffer_size = IO_BUFFER_SIZE;
889 buffer = av_malloc(buffer_size);
891 return AVERROR(ENOMEM);
893 internal = av_mallocz(sizeof(*internal));
899 *s = avio_alloc_context(buffer, buffer_size, h->flags & AVIO_FLAG_WRITE,
900 internal, io_read_packet, io_write_packet, io_seek);
904 (*s)->protocol_whitelist = av_strdup(h->protocol_whitelist);
905 if (!(*s)->protocol_whitelist && h->protocol_whitelist) {
909 (*s)->protocol_blacklist = av_strdup(h->protocol_blacklist);
910 if (!(*s)->protocol_blacklist && h->protocol_blacklist) {
914 (*s)->direct = h->flags & AVIO_FLAG_DIRECT;
916 (*s)->seekable = h->is_streamed ? 0 : AVIO_SEEKABLE_NORMAL;
917 (*s)->max_packet_size = max_packet_size;
919 (*s)->read_pause = io_read_pause;
920 (*s)->read_seek = io_read_seek;
922 (*s)->av_class = &ff_avio_class;
927 return AVERROR(ENOMEM);
930 int ffio_ensure_seekback(AVIOContext *s, int64_t buf_size)
933 int max_buffer_size = s->max_packet_size ?
934 s->max_packet_size : IO_BUFFER_SIZE;
935 int filled = s->buf_end - s->buffer;
936 ptrdiff_t checksum_ptr_offset = s->checksum_ptr ? s->checksum_ptr - s->buffer : -1;
938 buf_size += s->buf_ptr - s->buffer + max_buffer_size;
940 if (buf_size < filled || s->seekable || !s->read_packet)
942 av_assert0(!s->write_flag);
944 buffer = av_malloc(buf_size);
946 return AVERROR(ENOMEM);
948 memcpy(buffer, s->buffer, filled);
950 s->buf_ptr = buffer + (s->buf_ptr - s->buffer);
951 s->buf_end = buffer + (s->buf_end - s->buffer);
953 s->buffer_size = buf_size;
954 if (checksum_ptr_offset >= 0)
955 s->checksum_ptr = s->buffer + checksum_ptr_offset;
959 int ffio_set_buf_size(AVIOContext *s, int buf_size)
962 buffer = av_malloc(buf_size);
964 return AVERROR(ENOMEM);
968 s->orig_buffer_size =
969 s->buffer_size = buf_size;
971 url_resetbuf(s, s->write_flag ? AVIO_FLAG_WRITE : AVIO_FLAG_READ);
975 static int url_resetbuf(AVIOContext *s, int flags)
977 av_assert1(flags == AVIO_FLAG_WRITE || flags == AVIO_FLAG_READ);
979 if (flags & AVIO_FLAG_WRITE) {
980 s->buf_end = s->buffer + s->buffer_size;
983 s->buf_end = s->buffer;
989 int ffio_rewind_with_probe_data(AVIOContext *s, unsigned char **bufp, int buf_size)
991 int64_t buffer_start;
993 int overlap, new_size, alloc_size;
994 uint8_t *buf = *bufp;
998 return AVERROR(EINVAL);
1001 buffer_size = s->buf_end - s->buffer;
1003 /* the buffers must touch or overlap */
1004 if ((buffer_start = s->pos - buffer_size) > buf_size) {
1006 return AVERROR(EINVAL);
1009 overlap = buf_size - buffer_start;
1010 new_size = buf_size + buffer_size - overlap;
1012 alloc_size = FFMAX(s->buffer_size, new_size);
1013 if (alloc_size > buf_size)
1014 if (!(buf = (*bufp) = av_realloc_f(buf, 1, alloc_size)))
1015 return AVERROR(ENOMEM);
1017 if (new_size > buf_size) {
1018 memcpy(buf + buf_size, s->buffer + overlap, buffer_size - overlap);
1019 buf_size = new_size;
1023 s->buf_ptr = s->buffer = buf;
1024 s->buffer_size = alloc_size;
1026 s->buf_end = s->buf_ptr + buf_size;
1033 int avio_open(AVIOContext **s, const char *filename, int flags)
1035 return avio_open2(s, filename, flags, NULL, NULL);
1038 int ffio_open_whitelist(AVIOContext **s, const char *filename, int flags,
1039 const AVIOInterruptCB *int_cb, AVDictionary **options,
1040 const char *whitelist, const char *blacklist
1046 err = ffurl_open_whitelist(&h, filename, flags, int_cb, options, whitelist, blacklist, NULL);
1049 err = ffio_fdopen(s, h);
1057 int avio_open2(AVIOContext **s, const char *filename, int flags,
1058 const AVIOInterruptCB *int_cb, AVDictionary **options)
1060 return ffio_open_whitelist(s, filename, flags, int_cb, options, NULL, NULL);
1063 int ffio_open2_wrapper(struct AVFormatContext *s, AVIOContext **pb, const char *url, int flags,
1064 const AVIOInterruptCB *int_cb, AVDictionary **options)
1066 return ffio_open_whitelist(pb, url, flags, int_cb, options, s->protocol_whitelist, s->protocol_blacklist);
1069 int avio_close(AVIOContext *s)
1071 AVIOInternal *internal;
1078 internal = s->opaque;
1081 av_freep(&s->opaque);
1082 av_freep(&s->buffer);
1084 av_log(s, AV_LOG_DEBUG, "Statistics: %d seeks, %d writeouts\n", s->seek_count, s->writeout_count);
1086 av_log(s, AV_LOG_DEBUG, "Statistics: %"PRId64" bytes read, %d seeks\n", s->bytes_read, s->seek_count);
1089 return ffurl_close(h);
1092 int avio_closep(AVIOContext **s)
1094 int ret = avio_close(*s);
1099 int avio_printf(AVIOContext *s, const char *fmt, ...)
1102 char buf[4096]; /* update doc entry in avio.h if changed */
1106 ret = vsnprintf(buf, sizeof(buf), fmt, ap);
1108 avio_write(s, buf, strlen(buf));
1112 int avio_pause(AVIOContext *s, int pause)
1115 return AVERROR(ENOSYS);
1116 return s->read_pause(s->opaque, pause);
1119 int64_t avio_seek_time(AVIOContext *s, int stream_index,
1120 int64_t timestamp, int flags)
1124 return AVERROR(ENOSYS);
1125 ret = s->read_seek(s->opaque, stream_index, timestamp, flags);
1128 s->buf_ptr = s->buf_end; // Flush buffer
1129 pos = s->seek(s->opaque, 0, SEEK_CUR);
1132 else if (pos != AVERROR(ENOSYS))
1138 int avio_read_to_bprint(AVIOContext *h, AVBPrint *pb, size_t max_size)
1143 ret = avio_read(h, buf, FFMIN(max_size, sizeof(buf)));
1144 if (ret == AVERROR_EOF)
1148 av_bprint_append_data(pb, buf, ret);
1149 if (!av_bprint_is_complete(pb))
1150 return AVERROR(ENOMEM);
1156 int avio_accept(AVIOContext *s, AVIOContext **c)
1159 URLContext *sc = s->opaque;
1160 URLContext *cc = NULL;
1161 ret = ffurl_accept(sc, &cc);
1164 return ffio_fdopen(c, cc);
1167 int avio_handshake(AVIOContext *c)
1169 URLContext *cc = c->opaque;
1170 return ffurl_handshake(cc);
1173 /* output in a dynamic buffer */
1175 typedef struct DynBuffer {
1176 int pos, size, allocated_size;
1179 uint8_t io_buffer[1];
1182 static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size)
1184 DynBuffer *d = opaque;
1185 unsigned new_size, new_allocated_size;
1187 /* reallocate buffer if needed */
1188 new_size = d->pos + buf_size;
1189 new_allocated_size = d->allocated_size;
1190 if (new_size < d->pos || new_size > INT_MAX/2)
1192 while (new_size > new_allocated_size) {
1193 if (!new_allocated_size)
1194 new_allocated_size = new_size;
1196 new_allocated_size += new_allocated_size / 2 + 1;
1199 if (new_allocated_size > d->allocated_size) {
1201 if ((err = av_reallocp(&d->buffer, new_allocated_size)) < 0) {
1202 d->allocated_size = 0;
1206 d->allocated_size = new_allocated_size;
1208 memcpy(d->buffer + d->pos, buf, buf_size);
1210 if (d->pos > d->size)
1215 static int dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size)
1217 unsigned char buf1[4];
1220 /* packetized write: output the header */
1221 AV_WB32(buf1, buf_size);
1222 ret = dyn_buf_write(opaque, buf1, 4);
1227 return dyn_buf_write(opaque, buf, buf_size);
1230 static int64_t dyn_buf_seek(void *opaque, int64_t offset, int whence)
1232 DynBuffer *d = opaque;
1234 if (whence == SEEK_CUR)
1236 else if (whence == SEEK_END)
1238 if (offset < 0 || offset > 0x7fffffffLL)
1244 static int url_open_dyn_buf_internal(AVIOContext **s, int max_packet_size)
1247 unsigned io_buffer_size = max_packet_size ? max_packet_size : 1024;
1249 if (sizeof(DynBuffer) + io_buffer_size < io_buffer_size)
1251 d = av_mallocz(sizeof(DynBuffer) + io_buffer_size);
1253 return AVERROR(ENOMEM);
1254 d->io_buffer_size = io_buffer_size;
1255 *s = avio_alloc_context(d->io_buffer, d->io_buffer_size, 1, d, NULL,
1256 max_packet_size ? dyn_packet_buf_write : dyn_buf_write,
1257 max_packet_size ? NULL : dyn_buf_seek);
1260 return AVERROR(ENOMEM);
1262 (*s)->max_packet_size = max_packet_size;
1266 int avio_open_dyn_buf(AVIOContext **s)
1268 return url_open_dyn_buf_internal(s, 0);
1271 int ffio_open_dyn_packet_buf(AVIOContext **s, int max_packet_size)
1273 if (max_packet_size <= 0)
1275 return url_open_dyn_buf_internal(s, max_packet_size);
1278 int avio_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
1282 static const char padbuf[AV_INPUT_BUFFER_PADDING_SIZE] = {0};
1290 /* don't attempt to pad fixed-size packet buffers */
1291 if (!s->max_packet_size) {
1292 avio_write(s, padbuf, sizeof(padbuf));
1293 padding = AV_INPUT_BUFFER_PADDING_SIZE;
1299 *pbuffer = d->buffer;
1303 return size - padding;
1306 void ffio_free_dyn_buf(AVIOContext **s)
1311 avio_close_dyn_buf(*s, &tmp);
1316 static int null_buf_write(void *opaque, uint8_t *buf, int buf_size)
1318 DynBuffer *d = opaque;
1321 if (d->pos > d->size)
1326 int ffio_open_null_buf(AVIOContext **s)
1328 int ret = url_open_dyn_buf_internal(s, 0);
1330 AVIOContext *pb = *s;
1331 pb->write_packet = null_buf_write;
1336 int ffio_close_null_buf(AVIOContext *s)
1338 DynBuffer *d = s->opaque;