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;
94 s->buf_ptr_max = buffer;
98 url_resetbuf(s, write_flag ? AVIO_FLAG_WRITE : AVIO_FLAG_READ);
100 s->write_packet = write_packet;
101 s->read_packet = read_packet;
106 s->seekable = seek ? AVIO_SEEKABLE_NORMAL : 0;
107 s->min_packet_size = 0;
108 s->max_packet_size = 0;
109 s->update_checksum = NULL;
110 s->short_seek_threshold = SHORT_SEEK_THRESHOLD;
112 if (!read_packet && !write_flag) {
113 s->pos = buffer_size;
114 s->buf_end = s->buffer + buffer_size;
116 s->read_pause = NULL;
119 s->write_data_type = NULL;
120 s->ignore_boundary_point = 0;
121 s->current_type = AVIO_DATA_MARKER_UNKNOWN;
122 s->last_time = AV_NOPTS_VALUE;
123 s->short_seek_get = NULL;
129 AVIOContext *avio_alloc_context(
130 unsigned char *buffer,
134 int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
135 int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
136 int64_t (*seek)(void *opaque, int64_t offset, int whence))
138 AVIOContext *s = av_mallocz(sizeof(AVIOContext));
141 ffio_init_context(s, buffer, buffer_size, write_flag, opaque,
142 read_packet, write_packet, seek);
146 static void writeout(AVIOContext *s, const uint8_t *data, int len)
150 if (s->write_data_type)
151 ret = s->write_data_type(s->opaque, (uint8_t *)data,
155 else if (s->write_packet)
156 ret = s->write_packet(s->opaque, (uint8_t *)data, len);
160 if (s->pos + len > s->written)
161 s->written = s->pos + len;
164 if (s->current_type == AVIO_DATA_MARKER_SYNC_POINT ||
165 s->current_type == AVIO_DATA_MARKER_BOUNDARY_POINT) {
166 s->current_type = AVIO_DATA_MARKER_UNKNOWN;
168 s->last_time = AV_NOPTS_VALUE;
169 s->writeout_count ++;
173 static void flush_buffer(AVIOContext *s)
175 s->buf_ptr_max = FFMAX(s->buf_ptr, s->buf_ptr_max);
176 if (s->write_flag && s->buf_ptr_max > s->buffer) {
177 writeout(s, s->buffer, s->buf_ptr_max - s->buffer);
178 if (s->update_checksum) {
179 s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
180 s->buf_ptr_max - s->checksum_ptr);
181 s->checksum_ptr = s->buffer;
184 s->buf_ptr = s->buf_ptr_max = s->buffer;
186 s->buf_end = s->buffer;
189 void avio_w8(AVIOContext *s, int b)
191 av_assert2(b>=-128 && b<=255);
193 if (s->buf_ptr >= s->buf_end)
197 void ffio_fill(AVIOContext *s, int b, int count)
200 int len = FFMIN(s->buf_end - s->buf_ptr, count);
201 memset(s->buf_ptr, b, len);
204 if (s->buf_ptr >= s->buf_end)
211 void avio_write(AVIOContext *s, const unsigned char *buf, int size)
213 if (s->direct && !s->update_checksum) {
215 writeout(s, buf, size);
219 int len = FFMIN(s->buf_end - s->buf_ptr, size);
220 memcpy(s->buf_ptr, buf, len);
223 if (s->buf_ptr >= s->buf_end)
231 void avio_flush(AVIOContext *s)
233 int seekback = s->write_flag ? FFMIN(0, s->buf_ptr - s->buf_ptr_max) : 0;
236 avio_seek(s, seekback, SEEK_CUR);
239 int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
243 int force = whence & AVSEEK_FORCE;
246 whence &= ~AVSEEK_FORCE;
249 return AVERROR(EINVAL);
251 buffer_size = s->buf_end - s->buffer;
252 // pos is the absolute position that the beginning of s->buffer corresponds to in the file
253 pos = s->pos - (s->write_flag ? 0 : buffer_size);
255 if (whence != SEEK_CUR && whence != SEEK_SET)
256 return AVERROR(EINVAL);
258 if (whence == SEEK_CUR) {
259 offset1 = pos + (s->buf_ptr - s->buffer);
265 return AVERROR(EINVAL);
267 if (s->short_seek_get) {
268 short_seek = s->short_seek_get(s->opaque);
269 /* fallback to default short seek */
271 short_seek = s->short_seek_threshold;
273 short_seek = s->short_seek_threshold;
275 offset1 = offset - pos; // "offset1" is the relative offset from the beginning of s->buffer
276 s->buf_ptr_max = FFMAX(s->buf_ptr_max, s->buf_ptr);
277 if ((!s->direct || !s->seek) &&
278 offset1 >= 0 && offset1 <= (s->write_flag ? s->buf_ptr_max - s->buffer : buffer_size)) {
279 /* can do the seek inside the buffer */
280 s->buf_ptr = s->buffer + offset1;
281 } else if ((!(s->seekable & AVIO_SEEKABLE_NORMAL) ||
282 offset1 <= buffer_size + short_seek) &&
283 !s->write_flag && offset1 >= 0 &&
284 (!s->direct || !s->seek) &&
285 (whence != SEEK_END || force)) {
286 while(s->pos < offset && !s->eof_reached)
290 s->buf_ptr = s->buf_end - (s->pos - offset);
291 } else if(!s->write_flag && offset1 < 0 && -offset1 < buffer_size>>1 && s->seek && offset > 0) {
294 pos -= FFMIN(buffer_size>>1, pos);
295 if ((res = s->seek(s->opaque, pos, SEEK_SET)) < 0)
298 s->buf_ptr = s->buffer;
302 return avio_seek(s, offset, SEEK_SET | force);
309 return AVERROR(EPIPE);
310 if ((res = s->seek(s->opaque, offset, SEEK_SET)) < 0)
314 s->buf_end = s->buffer;
315 s->buf_ptr = s->buf_ptr_max = s->buffer;
322 int64_t avio_skip(AVIOContext *s, int64_t offset)
324 return avio_seek(s, offset, SEEK_CUR);
327 int64_t avio_size(AVIOContext *s)
332 return AVERROR(EINVAL);
338 return AVERROR(ENOSYS);
339 size = s->seek(s->opaque, 0, AVSEEK_SIZE);
341 if ((size = s->seek(s->opaque, -1, SEEK_END)) < 0)
344 s->seek(s->opaque, s->pos, SEEK_SET);
349 int avio_feof(AVIOContext *s)
357 return s->eof_reached;
361 int url_feof(AVIOContext *s)
367 void avio_wl32(AVIOContext *s, unsigned int val)
369 avio_w8(s, (uint8_t) val );
370 avio_w8(s, (uint8_t)(val >> 8 ));
371 avio_w8(s, (uint8_t)(val >> 16));
372 avio_w8(s, val >> 24 );
375 void avio_wb32(AVIOContext *s, unsigned int val)
377 avio_w8(s, val >> 24 );
378 avio_w8(s, (uint8_t)(val >> 16));
379 avio_w8(s, (uint8_t)(val >> 8 ));
380 avio_w8(s, (uint8_t) val );
383 int avio_put_str(AVIOContext *s, const char *str)
388 avio_write(s, (const unsigned char *) str, len);
394 static inline int put_str16(AVIOContext *s, const char *str, const int be)
396 const uint8_t *q = str;
404 GET_UTF8(ch, *q++, goto invalid;)
405 PUT_UTF16(ch, tmp, be ? avio_wb16(s, tmp) : avio_wl16(s, tmp);
409 av_log(s, AV_LOG_ERROR, "Invalid UTF8 sequence in avio_put_str16%s\n", be ? "be" : "le");
410 err = AVERROR(EINVAL);
424 #define PUT_STR16(type, big_endian) \
425 int avio_put_str16 ## type(AVIOContext *s, const char *str) \
427 return put_str16(s, str, big_endian); \
435 int ff_get_v_length(uint64_t val)
445 void ff_put_v(AVIOContext *bc, uint64_t val)
447 int i = ff_get_v_length(val);
450 avio_w8(bc, 128 | (uint8_t)(val >> (7*i)));
452 avio_w8(bc, val & 127);
455 void avio_wl64(AVIOContext *s, uint64_t val)
457 avio_wl32(s, (uint32_t)(val & 0xffffffff));
458 avio_wl32(s, (uint32_t)(val >> 32));
461 void avio_wb64(AVIOContext *s, uint64_t val)
463 avio_wb32(s, (uint32_t)(val >> 32));
464 avio_wb32(s, (uint32_t)(val & 0xffffffff));
467 void avio_wl16(AVIOContext *s, unsigned int val)
469 avio_w8(s, (uint8_t)val);
470 avio_w8(s, (int)val >> 8);
473 void avio_wb16(AVIOContext *s, unsigned int val)
475 avio_w8(s, (int)val >> 8);
476 avio_w8(s, (uint8_t)val);
479 void avio_wl24(AVIOContext *s, unsigned int val)
481 avio_wl16(s, val & 0xffff);
482 avio_w8(s, (int)val >> 16);
485 void avio_wb24(AVIOContext *s, unsigned int val)
487 avio_wb16(s, (int)val >> 8);
488 avio_w8(s, (uint8_t)val);
491 void avio_write_marker(AVIOContext *s, int64_t time, enum AVIODataMarkerType type)
493 if (type == AVIO_DATA_MARKER_FLUSH_POINT) {
494 if (s->buf_ptr - s->buffer >= s->min_packet_size)
498 if (!s->write_data_type)
500 // If ignoring boundary points, just treat it as unknown
501 if (type == AVIO_DATA_MARKER_BOUNDARY_POINT && s->ignore_boundary_point)
502 type = AVIO_DATA_MARKER_UNKNOWN;
503 // Avoid unnecessary flushes if we are already in non-header/trailer
504 // data and setting the type to unknown
505 if (type == AVIO_DATA_MARKER_UNKNOWN &&
506 (s->current_type != AVIO_DATA_MARKER_HEADER &&
507 s->current_type != AVIO_DATA_MARKER_TRAILER))
511 case AVIO_DATA_MARKER_HEADER:
512 case AVIO_DATA_MARKER_TRAILER:
513 // For header/trailer, ignore a new marker of the same type;
514 // consecutive header/trailer markers can be merged.
515 if (type == s->current_type)
520 // If we've reached here, we have a new, noteworthy marker.
521 // Flush the previous data and mark the start of the new data.
523 s->current_type = type;
529 static void fill_buffer(AVIOContext *s)
531 int max_buffer_size = s->max_packet_size ?
532 s->max_packet_size : IO_BUFFER_SIZE;
533 uint8_t *dst = s->buf_end - s->buffer + max_buffer_size < s->buffer_size ?
534 s->buf_end : s->buffer;
535 int len = s->buffer_size - (dst - s->buffer);
537 /* can't fill the buffer without read_packet, just set EOF if appropriate */
538 if (!s->read_packet && s->buf_ptr >= s->buf_end)
541 /* no need to do anything if EOF already reached */
545 if (s->update_checksum && dst == s->buffer) {
546 if (s->buf_end > s->checksum_ptr)
547 s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
548 s->buf_end - s->checksum_ptr);
549 s->checksum_ptr = s->buffer;
552 /* make buffer smaller in case it ended up large after probing */
553 if (s->read_packet && s->orig_buffer_size && s->buffer_size > s->orig_buffer_size) {
554 if (dst == s->buffer && s->buf_ptr != dst) {
555 int ret = ffio_set_buf_size(s, s->orig_buffer_size);
557 av_log(s, AV_LOG_WARNING, "Failed to decrease buffer size\n");
559 s->checksum_ptr = dst = s->buffer;
561 av_assert0(len >= s->orig_buffer_size);
562 len = s->orig_buffer_size;
566 len = s->read_packet(s->opaque, dst, len);
570 /* do not modify buffer if EOF reached so that a seek back can
571 be done without rereading data */
578 s->buf_end = dst + len;
579 s->bytes_read += len;
583 unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf,
586 return av_crc(av_crc_get_table(AV_CRC_32_IEEE), checksum, buf, len);
589 unsigned long ff_crcEDB88320_update(unsigned long checksum, const uint8_t *buf,
592 return av_crc(av_crc_get_table(AV_CRC_32_IEEE_LE), checksum, buf, len);
595 unsigned long ff_crcA001_update(unsigned long checksum, const uint8_t *buf,
598 return av_crc(av_crc_get_table(AV_CRC_16_ANSI_LE), checksum, buf, len);
601 unsigned long ffio_get_checksum(AVIOContext *s)
603 s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
604 s->buf_ptr - s->checksum_ptr);
605 s->update_checksum = NULL;
609 void ffio_init_checksum(AVIOContext *s,
610 unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len),
611 unsigned long checksum)
613 s->update_checksum = update_checksum;
614 if (s->update_checksum) {
615 s->checksum = checksum;
616 s->checksum_ptr = s->buf_ptr;
620 /* XXX: put an inline version */
621 int avio_r8(AVIOContext *s)
623 if (s->buf_ptr >= s->buf_end)
625 if (s->buf_ptr < s->buf_end)
626 return *s->buf_ptr++;
630 int avio_read(AVIOContext *s, unsigned char *buf, int size)
636 len = FFMIN(s->buf_end - s->buf_ptr, size);
637 if (len == 0 || s->write_flag) {
638 if((s->direct || size > s->buffer_size) && !s->update_checksum) {
639 // bypass the buffer and read data directly into buf
641 len = s->read_packet(s->opaque, buf, size);
644 /* do not modify buffer if EOF reached so that a seek back can
645 be done without rereading data */
652 s->bytes_read += len;
656 s->buf_ptr = s->buffer;
657 s->buf_end = s->buffer/* + len*/;
661 len = s->buf_end - s->buf_ptr;
666 memcpy(buf, s->buf_ptr, len);
673 if (s->error) return s->error;
674 if (avio_feof(s)) return AVERROR_EOF;
679 int ffio_read_size(AVIOContext *s, unsigned char *buf, int size)
681 int ret = avio_read(s, buf, size);
683 return AVERROR_INVALIDDATA;
687 int ffio_read_indirect(AVIOContext *s, unsigned char *buf, int size, const unsigned char **data)
689 if (s->buf_end - s->buf_ptr >= size && !s->write_flag) {
695 return avio_read(s, buf, size);
699 int ffio_read_partial(AVIOContext *s, unsigned char *buf, int size)
706 if (s->read_packet && s->write_flag) {
707 len = s->read_packet(s->opaque, buf, size);
713 len = s->buf_end - s->buf_ptr;
715 /* Reset the buf_end pointer to the start of the buffer, to make sure
716 * the fill_buffer call tries to read as much data as fits into the
717 * full buffer, instead of just what space is left after buf_end.
718 * This avoids returning partial packets at the end of the buffer,
719 * for packet based inputs.
721 s->buf_end = s->buf_ptr = s->buffer;
723 len = s->buf_end - s->buf_ptr;
727 memcpy(buf, s->buf_ptr, len);
730 if (s->error) return s->error;
731 if (avio_feof(s)) return AVERROR_EOF;
736 unsigned int avio_rl16(AVIOContext *s)
740 val |= avio_r8(s) << 8;
744 unsigned int avio_rl24(AVIOContext *s)
748 val |= avio_r8(s) << 16;
752 unsigned int avio_rl32(AVIOContext *s)
756 val |= avio_rl16(s) << 16;
760 uint64_t avio_rl64(AVIOContext *s)
763 val = (uint64_t)avio_rl32(s);
764 val |= (uint64_t)avio_rl32(s) << 32;
768 unsigned int avio_rb16(AVIOContext *s)
771 val = avio_r8(s) << 8;
776 unsigned int avio_rb24(AVIOContext *s)
779 val = avio_rb16(s) << 8;
783 unsigned int avio_rb32(AVIOContext *s)
786 val = avio_rb16(s) << 16;
791 int ff_get_line(AVIOContext *s, char *buf, int maxlen)
798 if (c && i < maxlen-1)
800 } while (c != '\n' && c != '\r' && c);
801 if (c == '\r' && avio_r8(s) != '\n' && !avio_feof(s))
808 int avio_get_str(AVIOContext *s, int maxlen, char *buf, int buflen)
813 return AVERROR(EINVAL);
814 // reserve 1 byte for terminating 0
815 buflen = FFMIN(buflen - 1, maxlen);
816 for (i = 0; i < buflen; i++)
817 if (!(buf[i] = avio_r8(s)))
820 for (; i < maxlen; i++)
826 #define GET_STR16(type, read) \
827 int avio_get_str16 ##type(AVIOContext *pb, int maxlen, char *buf, int buflen)\
832 return AVERROR(EINVAL); \
833 while (ret + 1 < maxlen) {\
836 GET_UTF16(ch, (ret += 2) <= maxlen ? read(pb) : 0, break;)\
839 PUT_UTF8(ch, tmp, if (q - buf < buflen - 1) *q++ = tmp;)\
845 GET_STR16(le, avio_rl16)
846 GET_STR16(be, avio_rb16)
850 uint64_t avio_rb64(AVIOContext *s)
853 val = (uint64_t)avio_rb32(s) << 32;
854 val |= (uint64_t)avio_rb32(s);
858 uint64_t ffio_read_varlen(AVIOContext *bc){
864 val= (val<<7) + (tmp&127);
869 static int io_read_packet(void *opaque, uint8_t *buf, int buf_size)
871 AVIOInternal *internal = opaque;
872 return ffurl_read(internal->h, buf, buf_size);
875 static int io_write_packet(void *opaque, uint8_t *buf, int buf_size)
877 AVIOInternal *internal = opaque;
878 return ffurl_write(internal->h, buf, buf_size);
881 static int64_t io_seek(void *opaque, int64_t offset, int whence)
883 AVIOInternal *internal = opaque;
884 return ffurl_seek(internal->h, offset, whence);
887 static int io_short_seek(void *opaque)
889 AVIOInternal *internal = opaque;
890 return ffurl_get_short_seek(internal->h);
893 static int io_read_pause(void *opaque, int pause)
895 AVIOInternal *internal = opaque;
896 if (!internal->h->prot->url_read_pause)
897 return AVERROR(ENOSYS);
898 return internal->h->prot->url_read_pause(internal->h, pause);
901 static int64_t io_read_seek(void *opaque, int stream_index, int64_t timestamp, int flags)
903 AVIOInternal *internal = opaque;
904 if (!internal->h->prot->url_read_seek)
905 return AVERROR(ENOSYS);
906 return internal->h->prot->url_read_seek(internal->h, stream_index, timestamp, flags);
909 int ffio_fdopen(AVIOContext **s, URLContext *h)
911 AVIOInternal *internal = NULL;
912 uint8_t *buffer = NULL;
913 int buffer_size, max_packet_size;
915 max_packet_size = h->max_packet_size;
916 if (max_packet_size) {
917 buffer_size = max_packet_size; /* no need to bufferize more than one packet */
919 buffer_size = IO_BUFFER_SIZE;
921 buffer = av_malloc(buffer_size);
923 return AVERROR(ENOMEM);
925 internal = av_mallocz(sizeof(*internal));
931 *s = avio_alloc_context(buffer, buffer_size, h->flags & AVIO_FLAG_WRITE,
932 internal, io_read_packet, io_write_packet, io_seek);
936 (*s)->protocol_whitelist = av_strdup(h->protocol_whitelist);
937 if (!(*s)->protocol_whitelist && h->protocol_whitelist) {
941 (*s)->protocol_blacklist = av_strdup(h->protocol_blacklist);
942 if (!(*s)->protocol_blacklist && h->protocol_blacklist) {
946 (*s)->direct = h->flags & AVIO_FLAG_DIRECT;
948 (*s)->seekable = h->is_streamed ? 0 : AVIO_SEEKABLE_NORMAL;
949 (*s)->max_packet_size = max_packet_size;
950 (*s)->min_packet_size = h->min_packet_size;
952 (*s)->read_pause = io_read_pause;
953 (*s)->read_seek = io_read_seek;
955 if (h->prot->url_read_seek)
956 (*s)->seekable |= AVIO_SEEKABLE_TIME;
958 (*s)->short_seek_get = io_short_seek;
959 (*s)->av_class = &ff_avio_class;
964 return AVERROR(ENOMEM);
967 int ffio_ensure_seekback(AVIOContext *s, int64_t buf_size)
970 int max_buffer_size = s->max_packet_size ?
971 s->max_packet_size : IO_BUFFER_SIZE;
972 int filled = s->buf_end - s->buffer;
973 ptrdiff_t checksum_ptr_offset = s->checksum_ptr ? s->checksum_ptr - s->buffer : -1;
975 buf_size += s->buf_ptr - s->buffer + max_buffer_size;
977 if (buf_size < filled || s->seekable || !s->read_packet)
979 av_assert0(!s->write_flag);
981 buffer = av_malloc(buf_size);
983 return AVERROR(ENOMEM);
985 memcpy(buffer, s->buffer, filled);
987 s->buf_ptr = buffer + (s->buf_ptr - s->buffer);
988 s->buf_end = buffer + (s->buf_end - s->buffer);
990 s->buffer_size = buf_size;
991 if (checksum_ptr_offset >= 0)
992 s->checksum_ptr = s->buffer + checksum_ptr_offset;
996 int ffio_set_buf_size(AVIOContext *s, int buf_size)
999 buffer = av_malloc(buf_size);
1001 return AVERROR(ENOMEM);
1005 s->orig_buffer_size =
1006 s->buffer_size = buf_size;
1007 s->buf_ptr = s->buf_ptr_max = buffer;
1008 url_resetbuf(s, s->write_flag ? AVIO_FLAG_WRITE : AVIO_FLAG_READ);
1012 static int url_resetbuf(AVIOContext *s, int flags)
1014 av_assert1(flags == AVIO_FLAG_WRITE || flags == AVIO_FLAG_READ);
1016 if (flags & AVIO_FLAG_WRITE) {
1017 s->buf_end = s->buffer + s->buffer_size;
1020 s->buf_end = s->buffer;
1026 int ffio_rewind_with_probe_data(AVIOContext *s, unsigned char **bufp, int buf_size)
1028 int64_t buffer_start;
1030 int overlap, new_size, alloc_size;
1031 uint8_t *buf = *bufp;
1033 if (s->write_flag) {
1035 return AVERROR(EINVAL);
1038 buffer_size = s->buf_end - s->buffer;
1040 /* the buffers must touch or overlap */
1041 if ((buffer_start = s->pos - buffer_size) > buf_size) {
1043 return AVERROR(EINVAL);
1046 overlap = buf_size - buffer_start;
1047 new_size = buf_size + buffer_size - overlap;
1049 alloc_size = FFMAX(s->buffer_size, new_size);
1050 if (alloc_size > buf_size)
1051 if (!(buf = (*bufp) = av_realloc_f(buf, 1, alloc_size)))
1052 return AVERROR(ENOMEM);
1054 if (new_size > buf_size) {
1055 memcpy(buf + buf_size, s->buffer + overlap, buffer_size - overlap);
1056 buf_size = new_size;
1060 s->buf_ptr = s->buffer = buf;
1061 s->buffer_size = alloc_size;
1063 s->buf_end = s->buf_ptr + buf_size;
1069 int avio_open(AVIOContext **s, const char *filename, int flags)
1071 return avio_open2(s, filename, flags, NULL, NULL);
1074 int ffio_open_whitelist(AVIOContext **s, const char *filename, int flags,
1075 const AVIOInterruptCB *int_cb, AVDictionary **options,
1076 const char *whitelist, const char *blacklist
1082 err = ffurl_open_whitelist(&h, filename, flags, int_cb, options, whitelist, blacklist, NULL);
1085 err = ffio_fdopen(s, h);
1093 int avio_open2(AVIOContext **s, const char *filename, int flags,
1094 const AVIOInterruptCB *int_cb, AVDictionary **options)
1096 return ffio_open_whitelist(s, filename, flags, int_cb, options, NULL, NULL);
1099 int ffio_open2_wrapper(struct AVFormatContext *s, AVIOContext **pb, const char *url, int flags,
1100 const AVIOInterruptCB *int_cb, AVDictionary **options)
1102 return ffio_open_whitelist(pb, url, flags, int_cb, options, s->protocol_whitelist, s->protocol_blacklist);
1105 int avio_close(AVIOContext *s)
1107 AVIOInternal *internal;
1114 internal = s->opaque;
1117 av_freep(&s->opaque);
1118 av_freep(&s->buffer);
1120 av_log(s, AV_LOG_DEBUG, "Statistics: %d seeks, %d writeouts\n", s->seek_count, s->writeout_count);
1122 av_log(s, AV_LOG_DEBUG, "Statistics: %"PRId64" bytes read, %d seeks\n", s->bytes_read, s->seek_count);
1125 return ffurl_close(h);
1128 int avio_closep(AVIOContext **s)
1130 int ret = avio_close(*s);
1135 int avio_printf(AVIOContext *s, const char *fmt, ...)
1138 char buf[4096]; /* update doc entry in avio.h if changed */
1142 ret = vsnprintf(buf, sizeof(buf), fmt, ap);
1144 avio_write(s, buf, strlen(buf));
1148 int avio_pause(AVIOContext *s, int pause)
1151 return AVERROR(ENOSYS);
1152 return s->read_pause(s->opaque, pause);
1155 int64_t avio_seek_time(AVIOContext *s, int stream_index,
1156 int64_t timestamp, int flags)
1160 return AVERROR(ENOSYS);
1161 ret = s->read_seek(s->opaque, stream_index, timestamp, flags);
1164 s->buf_ptr = s->buf_end; // Flush buffer
1165 pos = s->seek(s->opaque, 0, SEEK_CUR);
1168 else if (pos != AVERROR(ENOSYS))
1174 int avio_read_to_bprint(AVIOContext *h, AVBPrint *pb, size_t max_size)
1179 ret = avio_read(h, buf, FFMIN(max_size, sizeof(buf)));
1180 if (ret == AVERROR_EOF)
1184 av_bprint_append_data(pb, buf, ret);
1185 if (!av_bprint_is_complete(pb))
1186 return AVERROR(ENOMEM);
1192 int avio_accept(AVIOContext *s, AVIOContext **c)
1195 AVIOInternal *internal = s->opaque;
1196 URLContext *sc = internal->h;
1197 URLContext *cc = NULL;
1198 ret = ffurl_accept(sc, &cc);
1201 return ffio_fdopen(c, cc);
1204 int avio_handshake(AVIOContext *c)
1206 AVIOInternal *internal = c->opaque;
1207 URLContext *cc = internal->h;
1208 return ffurl_handshake(cc);
1211 /* output in a dynamic buffer */
1213 typedef struct DynBuffer {
1214 int pos, size, allocated_size;
1217 uint8_t io_buffer[1];
1220 static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size)
1222 DynBuffer *d = opaque;
1223 unsigned new_size, new_allocated_size;
1225 /* reallocate buffer if needed */
1226 new_size = d->pos + buf_size;
1227 new_allocated_size = d->allocated_size;
1228 if (new_size < d->pos || new_size > INT_MAX/2)
1230 while (new_size > new_allocated_size) {
1231 if (!new_allocated_size)
1232 new_allocated_size = new_size;
1234 new_allocated_size += new_allocated_size / 2 + 1;
1237 if (new_allocated_size > d->allocated_size) {
1239 if ((err = av_reallocp(&d->buffer, new_allocated_size)) < 0) {
1240 d->allocated_size = 0;
1244 d->allocated_size = new_allocated_size;
1246 memcpy(d->buffer + d->pos, buf, buf_size);
1248 if (d->pos > d->size)
1253 static int dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size)
1255 unsigned char buf1[4];
1258 /* packetized write: output the header */
1259 AV_WB32(buf1, buf_size);
1260 ret = dyn_buf_write(opaque, buf1, 4);
1265 return dyn_buf_write(opaque, buf, buf_size);
1268 static int64_t dyn_buf_seek(void *opaque, int64_t offset, int whence)
1270 DynBuffer *d = opaque;
1272 if (whence == SEEK_CUR)
1274 else if (whence == SEEK_END)
1276 if (offset < 0 || offset > 0x7fffffffLL)
1282 static int url_open_dyn_buf_internal(AVIOContext **s, int max_packet_size)
1285 unsigned io_buffer_size = max_packet_size ? max_packet_size : 1024;
1287 if (sizeof(DynBuffer) + io_buffer_size < io_buffer_size)
1289 d = av_mallocz(sizeof(DynBuffer) + io_buffer_size);
1291 return AVERROR(ENOMEM);
1292 d->io_buffer_size = io_buffer_size;
1293 *s = avio_alloc_context(d->io_buffer, d->io_buffer_size, 1, d, NULL,
1294 max_packet_size ? dyn_packet_buf_write : dyn_buf_write,
1295 max_packet_size ? NULL : dyn_buf_seek);
1298 return AVERROR(ENOMEM);
1300 (*s)->max_packet_size = max_packet_size;
1304 int avio_open_dyn_buf(AVIOContext **s)
1306 return url_open_dyn_buf_internal(s, 0);
1309 int ffio_open_dyn_packet_buf(AVIOContext **s, int max_packet_size)
1311 if (max_packet_size <= 0)
1313 return url_open_dyn_buf_internal(s, max_packet_size);
1316 int avio_get_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
1328 *pbuffer = d->buffer;
1333 int avio_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
1337 static const char padbuf[AV_INPUT_BUFFER_PADDING_SIZE] = {0};
1345 /* don't attempt to pad fixed-size packet buffers */
1346 if (!s->max_packet_size) {
1347 avio_write(s, padbuf, sizeof(padbuf));
1348 padding = AV_INPUT_BUFFER_PADDING_SIZE;
1354 *pbuffer = d->buffer;
1358 return size - padding;
1361 void ffio_free_dyn_buf(AVIOContext **s)
1366 avio_close_dyn_buf(*s, &tmp);
1371 static int null_buf_write(void *opaque, uint8_t *buf, int buf_size)
1373 DynBuffer *d = opaque;
1376 if (d->pos > d->size)
1381 int ffio_open_null_buf(AVIOContext **s)
1383 int ret = url_open_dyn_buf_internal(s, 0);
1385 AVIOContext *pb = *s;
1386 pb->write_packet = null_buf_write;
1391 int ffio_close_null_buf(AVIOContext *s)
1393 DynBuffer *d = s->opaque;