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 void avio_context_free(AVIOContext **ps)
151 static void writeout(AVIOContext *s, const uint8_t *data, int len)
155 if (s->write_data_type)
156 ret = s->write_data_type(s->opaque, (uint8_t *)data,
160 else if (s->write_packet)
161 ret = s->write_packet(s->opaque, (uint8_t *)data, len);
165 if (s->pos + len > s->written)
166 s->written = s->pos + len;
169 if (s->current_type == AVIO_DATA_MARKER_SYNC_POINT ||
170 s->current_type == AVIO_DATA_MARKER_BOUNDARY_POINT) {
171 s->current_type = AVIO_DATA_MARKER_UNKNOWN;
173 s->last_time = AV_NOPTS_VALUE;
174 s->writeout_count ++;
178 static void flush_buffer(AVIOContext *s)
180 s->buf_ptr_max = FFMAX(s->buf_ptr, s->buf_ptr_max);
181 if (s->write_flag && s->buf_ptr_max > s->buffer) {
182 writeout(s, s->buffer, s->buf_ptr_max - s->buffer);
183 if (s->update_checksum) {
184 s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
185 s->buf_ptr_max - s->checksum_ptr);
186 s->checksum_ptr = s->buffer;
189 s->buf_ptr = s->buf_ptr_max = s->buffer;
191 s->buf_end = s->buffer;
194 void avio_w8(AVIOContext *s, int b)
196 av_assert2(b>=-128 && b<=255);
198 if (s->buf_ptr >= s->buf_end)
202 void ffio_fill(AVIOContext *s, int b, int count)
205 int len = FFMIN(s->buf_end - s->buf_ptr, count);
206 memset(s->buf_ptr, b, len);
209 if (s->buf_ptr >= s->buf_end)
216 void avio_write(AVIOContext *s, const unsigned char *buf, int size)
218 if (s->direct && !s->update_checksum) {
220 writeout(s, buf, size);
224 int len = FFMIN(s->buf_end - s->buf_ptr, size);
225 memcpy(s->buf_ptr, buf, len);
228 if (s->buf_ptr >= s->buf_end)
236 void avio_flush(AVIOContext *s)
238 int seekback = s->write_flag ? FFMIN(0, s->buf_ptr - s->buf_ptr_max) : 0;
241 avio_seek(s, seekback, SEEK_CUR);
244 int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
248 int force = whence & AVSEEK_FORCE;
251 whence &= ~AVSEEK_FORCE;
254 return AVERROR(EINVAL);
256 buffer_size = s->buf_end - s->buffer;
257 // pos is the absolute position that the beginning of s->buffer corresponds to in the file
258 pos = s->pos - (s->write_flag ? 0 : buffer_size);
260 if (whence != SEEK_CUR && whence != SEEK_SET)
261 return AVERROR(EINVAL);
263 if (whence == SEEK_CUR) {
264 offset1 = pos + (s->buf_ptr - s->buffer);
267 if (offset > INT64_MAX - offset1)
268 return AVERROR(EINVAL);
272 return AVERROR(EINVAL);
274 if (s->short_seek_get) {
275 short_seek = s->short_seek_get(s->opaque);
276 /* fallback to default short seek */
278 short_seek = s->short_seek_threshold;
280 short_seek = s->short_seek_threshold;
282 offset1 = offset - pos; // "offset1" is the relative offset from the beginning of s->buffer
283 s->buf_ptr_max = FFMAX(s->buf_ptr_max, s->buf_ptr);
284 if ((!s->direct || !s->seek) &&
285 offset1 >= 0 && offset1 <= (s->write_flag ? s->buf_ptr_max - s->buffer : buffer_size)) {
286 /* can do the seek inside the buffer */
287 s->buf_ptr = s->buffer + offset1;
288 } else if ((!(s->seekable & AVIO_SEEKABLE_NORMAL) ||
289 offset1 <= buffer_size + short_seek) &&
290 !s->write_flag && offset1 >= 0 &&
291 (!s->direct || !s->seek) &&
292 (whence != SEEK_END || force)) {
293 while(s->pos < offset && !s->eof_reached)
297 s->buf_ptr = s->buf_end - (s->pos - offset);
298 } else if(!s->write_flag && offset1 < 0 && -offset1 < buffer_size>>1 && s->seek && offset > 0) {
301 pos -= FFMIN(buffer_size>>1, pos);
302 if ((res = s->seek(s->opaque, pos, SEEK_SET)) < 0)
305 s->buf_ptr = s->buffer;
309 return avio_seek(s, offset, SEEK_SET | force);
316 return AVERROR(EPIPE);
317 if ((res = s->seek(s->opaque, offset, SEEK_SET)) < 0)
321 s->buf_end = s->buffer;
322 s->buf_ptr = s->buf_ptr_max = s->buffer;
329 int64_t avio_skip(AVIOContext *s, int64_t offset)
331 return avio_seek(s, offset, SEEK_CUR);
334 int64_t avio_size(AVIOContext *s)
339 return AVERROR(EINVAL);
345 return AVERROR(ENOSYS);
346 size = s->seek(s->opaque, 0, AVSEEK_SIZE);
348 if ((size = s->seek(s->opaque, -1, SEEK_END)) < 0)
351 s->seek(s->opaque, s->pos, SEEK_SET);
356 int avio_feof(AVIOContext *s)
364 return s->eof_reached;
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;
527 static int read_packet_wrapper(AVIOContext *s, uint8_t *buf, int size)
532 return AVERROR(EINVAL);
533 ret = s->read_packet(s->opaque, buf, size);
534 #if FF_API_OLD_AVIO_EOF_0
535 if (!ret && !s->max_packet_size) {
536 av_log(NULL, AV_LOG_WARNING, "Invalid return value 0 for stream protocol\n");
540 av_assert2(ret || s->max_packet_size);
547 static void fill_buffer(AVIOContext *s)
549 int max_buffer_size = s->max_packet_size ?
550 s->max_packet_size : IO_BUFFER_SIZE;
551 uint8_t *dst = s->buf_end - s->buffer + max_buffer_size < s->buffer_size ?
552 s->buf_end : s->buffer;
553 int len = s->buffer_size - (dst - s->buffer);
555 /* can't fill the buffer without read_packet, just set EOF if appropriate */
556 if (!s->read_packet && s->buf_ptr >= s->buf_end)
559 /* no need to do anything if EOF already reached */
563 if (s->update_checksum && dst == s->buffer) {
564 if (s->buf_end > s->checksum_ptr)
565 s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
566 s->buf_end - s->checksum_ptr);
567 s->checksum_ptr = s->buffer;
570 /* make buffer smaller in case it ended up large after probing */
571 if (s->read_packet && s->orig_buffer_size && s->buffer_size > s->orig_buffer_size) {
572 if (dst == s->buffer && s->buf_ptr != dst) {
573 int ret = ffio_set_buf_size(s, s->orig_buffer_size);
575 av_log(s, AV_LOG_WARNING, "Failed to decrease buffer size\n");
577 s->checksum_ptr = dst = s->buffer;
579 av_assert0(len >= s->orig_buffer_size);
580 len = s->orig_buffer_size;
583 len = read_packet_wrapper(s, dst, len);
584 if (len == AVERROR_EOF) {
585 /* do not modify buffer if EOF reached so that a seek back can
586 be done without rereading data */
588 } else if (len < 0) {
594 s->buf_end = dst + len;
595 s->bytes_read += len;
599 unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf,
602 return av_crc(av_crc_get_table(AV_CRC_32_IEEE), checksum, buf, len);
605 unsigned long ff_crcEDB88320_update(unsigned long checksum, const uint8_t *buf,
608 return av_crc(av_crc_get_table(AV_CRC_32_IEEE_LE), checksum, buf, len);
611 unsigned long ff_crcA001_update(unsigned long checksum, const uint8_t *buf,
614 return av_crc(av_crc_get_table(AV_CRC_16_ANSI_LE), checksum, buf, len);
617 unsigned long ffio_get_checksum(AVIOContext *s)
619 s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
620 s->buf_ptr - s->checksum_ptr);
621 s->update_checksum = NULL;
625 void ffio_init_checksum(AVIOContext *s,
626 unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len),
627 unsigned long checksum)
629 s->update_checksum = update_checksum;
630 if (s->update_checksum) {
631 s->checksum = checksum;
632 s->checksum_ptr = s->buf_ptr;
636 /* XXX: put an inline version */
637 int avio_r8(AVIOContext *s)
639 if (s->buf_ptr >= s->buf_end)
641 if (s->buf_ptr < s->buf_end)
642 return *s->buf_ptr++;
646 int avio_read(AVIOContext *s, unsigned char *buf, int size)
652 len = FFMIN(s->buf_end - s->buf_ptr, size);
653 if (len == 0 || s->write_flag) {
654 if((s->direct || size > s->buffer_size) && !s->update_checksum) {
655 // bypass the buffer and read data directly into buf
656 len = read_packet_wrapper(s, buf, size);
657 if (len == AVERROR_EOF) {
658 /* do not modify buffer if EOF reached so that a seek back can
659 be done without rereading data */
662 } else if (len < 0) {
668 s->bytes_read += len;
672 s->buf_ptr = s->buffer;
673 s->buf_end = s->buffer/* + len*/;
677 len = s->buf_end - s->buf_ptr;
682 memcpy(buf, s->buf_ptr, len);
689 if (s->error) return s->error;
690 if (avio_feof(s)) return AVERROR_EOF;
695 int ffio_read_size(AVIOContext *s, unsigned char *buf, int size)
697 int ret = avio_read(s, buf, size);
699 return AVERROR_INVALIDDATA;
703 int ffio_read_indirect(AVIOContext *s, unsigned char *buf, int size, const unsigned char **data)
705 if (s->buf_end - s->buf_ptr >= size && !s->write_flag) {
711 return avio_read(s, buf, size);
715 int avio_read_partial(AVIOContext *s, unsigned char *buf, int size)
722 if (s->read_packet && s->write_flag) {
723 len = read_packet_wrapper(s, buf, size);
729 len = s->buf_end - s->buf_ptr;
731 /* Reset the buf_end pointer to the start of the buffer, to make sure
732 * the fill_buffer call tries to read as much data as fits into the
733 * full buffer, instead of just what space is left after buf_end.
734 * This avoids returning partial packets at the end of the buffer,
735 * for packet based inputs.
737 s->buf_end = s->buf_ptr = s->buffer;
739 len = s->buf_end - s->buf_ptr;
743 memcpy(buf, s->buf_ptr, len);
746 if (s->error) return s->error;
747 if (avio_feof(s)) return AVERROR_EOF;
752 unsigned int avio_rl16(AVIOContext *s)
756 val |= avio_r8(s) << 8;
760 unsigned int avio_rl24(AVIOContext *s)
764 val |= avio_r8(s) << 16;
768 unsigned int avio_rl32(AVIOContext *s)
772 val |= avio_rl16(s) << 16;
776 uint64_t avio_rl64(AVIOContext *s)
779 val = (uint64_t)avio_rl32(s);
780 val |= (uint64_t)avio_rl32(s) << 32;
784 unsigned int avio_rb16(AVIOContext *s)
787 val = avio_r8(s) << 8;
792 unsigned int avio_rb24(AVIOContext *s)
795 val = avio_rb16(s) << 8;
799 unsigned int avio_rb32(AVIOContext *s)
802 val = avio_rb16(s) << 16;
807 int ff_get_line(AVIOContext *s, char *buf, int maxlen)
814 if (c && i < maxlen-1)
816 } while (c != '\n' && c != '\r' && c);
817 if (c == '\r' && avio_r8(s) != '\n' && !avio_feof(s))
824 int avio_get_str(AVIOContext *s, int maxlen, char *buf, int buflen)
829 return AVERROR(EINVAL);
830 // reserve 1 byte for terminating 0
831 buflen = FFMIN(buflen - 1, maxlen);
832 for (i = 0; i < buflen; i++)
833 if (!(buf[i] = avio_r8(s)))
836 for (; i < maxlen; i++)
842 #define GET_STR16(type, read) \
843 int avio_get_str16 ##type(AVIOContext *pb, int maxlen, char *buf, int buflen)\
848 return AVERROR(EINVAL); \
849 while (ret + 1 < maxlen) {\
852 GET_UTF16(ch, (ret += 2) <= maxlen ? read(pb) : 0, break;)\
855 PUT_UTF8(ch, tmp, if (q - buf < buflen - 1) *q++ = tmp;)\
861 GET_STR16(le, avio_rl16)
862 GET_STR16(be, avio_rb16)
866 uint64_t avio_rb64(AVIOContext *s)
869 val = (uint64_t)avio_rb32(s) << 32;
870 val |= (uint64_t)avio_rb32(s);
874 uint64_t ffio_read_varlen(AVIOContext *bc){
880 val= (val<<7) + (tmp&127);
885 static int io_read_packet(void *opaque, uint8_t *buf, int buf_size)
887 AVIOInternal *internal = opaque;
888 return ffurl_read(internal->h, buf, buf_size);
891 static int io_write_packet(void *opaque, uint8_t *buf, int buf_size)
893 AVIOInternal *internal = opaque;
894 return ffurl_write(internal->h, buf, buf_size);
897 static int64_t io_seek(void *opaque, int64_t offset, int whence)
899 AVIOInternal *internal = opaque;
900 return ffurl_seek(internal->h, offset, whence);
903 static int io_short_seek(void *opaque)
905 AVIOInternal *internal = opaque;
906 return ffurl_get_short_seek(internal->h);
909 static int io_read_pause(void *opaque, int pause)
911 AVIOInternal *internal = opaque;
912 if (!internal->h->prot->url_read_pause)
913 return AVERROR(ENOSYS);
914 return internal->h->prot->url_read_pause(internal->h, pause);
917 static int64_t io_read_seek(void *opaque, int stream_index, int64_t timestamp, int flags)
919 AVIOInternal *internal = opaque;
920 if (!internal->h->prot->url_read_seek)
921 return AVERROR(ENOSYS);
922 return internal->h->prot->url_read_seek(internal->h, stream_index, timestamp, flags);
925 int ffio_fdopen(AVIOContext **s, URLContext *h)
927 AVIOInternal *internal = NULL;
928 uint8_t *buffer = NULL;
929 int buffer_size, max_packet_size;
931 max_packet_size = h->max_packet_size;
932 if (max_packet_size) {
933 buffer_size = max_packet_size; /* no need to bufferize more than one packet */
935 buffer_size = IO_BUFFER_SIZE;
937 buffer = av_malloc(buffer_size);
939 return AVERROR(ENOMEM);
941 internal = av_mallocz(sizeof(*internal));
947 *s = avio_alloc_context(buffer, buffer_size, h->flags & AVIO_FLAG_WRITE,
948 internal, io_read_packet, io_write_packet, io_seek);
952 (*s)->protocol_whitelist = av_strdup(h->protocol_whitelist);
953 if (!(*s)->protocol_whitelist && h->protocol_whitelist) {
957 (*s)->protocol_blacklist = av_strdup(h->protocol_blacklist);
958 if (!(*s)->protocol_blacklist && h->protocol_blacklist) {
962 (*s)->direct = h->flags & AVIO_FLAG_DIRECT;
964 (*s)->seekable = h->is_streamed ? 0 : AVIO_SEEKABLE_NORMAL;
965 (*s)->max_packet_size = max_packet_size;
966 (*s)->min_packet_size = h->min_packet_size;
968 (*s)->read_pause = io_read_pause;
969 (*s)->read_seek = io_read_seek;
971 if (h->prot->url_read_seek)
972 (*s)->seekable |= AVIO_SEEKABLE_TIME;
974 (*s)->short_seek_get = io_short_seek;
975 (*s)->av_class = &ff_avio_class;
980 return AVERROR(ENOMEM);
983 int ffio_ensure_seekback(AVIOContext *s, int64_t buf_size)
986 int max_buffer_size = s->max_packet_size ?
987 s->max_packet_size : IO_BUFFER_SIZE;
988 int filled = s->buf_end - s->buffer;
989 ptrdiff_t checksum_ptr_offset = s->checksum_ptr ? s->checksum_ptr - s->buffer : -1;
991 buf_size += s->buf_ptr - s->buffer + max_buffer_size;
993 if (buf_size < filled || s->seekable || !s->read_packet)
995 av_assert0(!s->write_flag);
997 buffer = av_malloc(buf_size);
999 return AVERROR(ENOMEM);
1001 memcpy(buffer, s->buffer, filled);
1003 s->buf_ptr = buffer + (s->buf_ptr - s->buffer);
1004 s->buf_end = buffer + (s->buf_end - s->buffer);
1006 s->buffer_size = buf_size;
1007 if (checksum_ptr_offset >= 0)
1008 s->checksum_ptr = s->buffer + checksum_ptr_offset;
1012 int ffio_set_buf_size(AVIOContext *s, int buf_size)
1015 buffer = av_malloc(buf_size);
1017 return AVERROR(ENOMEM);
1021 s->orig_buffer_size =
1022 s->buffer_size = buf_size;
1023 s->buf_ptr = s->buf_ptr_max = buffer;
1024 url_resetbuf(s, s->write_flag ? AVIO_FLAG_WRITE : AVIO_FLAG_READ);
1028 static int url_resetbuf(AVIOContext *s, int flags)
1030 av_assert1(flags == AVIO_FLAG_WRITE || flags == AVIO_FLAG_READ);
1032 if (flags & AVIO_FLAG_WRITE) {
1033 s->buf_end = s->buffer + s->buffer_size;
1036 s->buf_end = s->buffer;
1042 int ffio_rewind_with_probe_data(AVIOContext *s, unsigned char **bufp, int buf_size)
1044 int64_t buffer_start;
1046 int overlap, new_size, alloc_size;
1047 uint8_t *buf = *bufp;
1049 if (s->write_flag) {
1051 return AVERROR(EINVAL);
1054 buffer_size = s->buf_end - s->buffer;
1056 /* the buffers must touch or overlap */
1057 if ((buffer_start = s->pos - buffer_size) > buf_size) {
1059 return AVERROR(EINVAL);
1062 overlap = buf_size - buffer_start;
1063 new_size = buf_size + buffer_size - overlap;
1065 alloc_size = FFMAX(s->buffer_size, new_size);
1066 if (alloc_size > buf_size)
1067 if (!(buf = (*bufp) = av_realloc_f(buf, 1, alloc_size)))
1068 return AVERROR(ENOMEM);
1070 if (new_size > buf_size) {
1071 memcpy(buf + buf_size, s->buffer + overlap, buffer_size - overlap);
1072 buf_size = new_size;
1076 s->buf_ptr = s->buffer = buf;
1077 s->buffer_size = alloc_size;
1079 s->buf_end = s->buf_ptr + buf_size;
1085 int avio_open(AVIOContext **s, const char *filename, int flags)
1087 return avio_open2(s, filename, flags, NULL, NULL);
1090 int ffio_open_whitelist(AVIOContext **s, const char *filename, int flags,
1091 const AVIOInterruptCB *int_cb, AVDictionary **options,
1092 const char *whitelist, const char *blacklist
1098 err = ffurl_open_whitelist(&h, filename, flags, int_cb, options, whitelist, blacklist, NULL);
1101 err = ffio_fdopen(s, h);
1109 int avio_open2(AVIOContext **s, const char *filename, int flags,
1110 const AVIOInterruptCB *int_cb, AVDictionary **options)
1112 return ffio_open_whitelist(s, filename, flags, int_cb, options, NULL, NULL);
1115 int ffio_open2_wrapper(struct AVFormatContext *s, AVIOContext **pb, const char *url, int flags,
1116 const AVIOInterruptCB *int_cb, AVDictionary **options)
1118 return ffio_open_whitelist(pb, url, flags, int_cb, options, s->protocol_whitelist, s->protocol_blacklist);
1121 int avio_close(AVIOContext *s)
1123 AVIOInternal *internal;
1130 internal = s->opaque;
1133 av_freep(&s->opaque);
1134 av_freep(&s->buffer);
1136 av_log(s, AV_LOG_DEBUG, "Statistics: %d seeks, %d writeouts\n", s->seek_count, s->writeout_count);
1138 av_log(s, AV_LOG_DEBUG, "Statistics: %"PRId64" bytes read, %d seeks\n", s->bytes_read, s->seek_count);
1141 avio_context_free(&s);
1143 return ffurl_close(h);
1146 int avio_closep(AVIOContext **s)
1148 int ret = avio_close(*s);
1153 int avio_printf(AVIOContext *s, const char *fmt, ...)
1156 char buf[4096]; /* update doc entry in avio.h if changed */
1160 ret = vsnprintf(buf, sizeof(buf), fmt, ap);
1162 avio_write(s, buf, strlen(buf));
1166 int avio_pause(AVIOContext *s, int pause)
1169 return AVERROR(ENOSYS);
1170 return s->read_pause(s->opaque, pause);
1173 int64_t avio_seek_time(AVIOContext *s, int stream_index,
1174 int64_t timestamp, int flags)
1178 return AVERROR(ENOSYS);
1179 ret = s->read_seek(s->opaque, stream_index, timestamp, flags);
1182 s->buf_ptr = s->buf_end; // Flush buffer
1183 pos = s->seek(s->opaque, 0, SEEK_CUR);
1186 else if (pos != AVERROR(ENOSYS))
1192 int avio_read_to_bprint(AVIOContext *h, AVBPrint *pb, size_t max_size)
1197 ret = avio_read(h, buf, FFMIN(max_size, sizeof(buf)));
1198 if (ret == AVERROR_EOF)
1202 av_bprint_append_data(pb, buf, ret);
1203 if (!av_bprint_is_complete(pb))
1204 return AVERROR(ENOMEM);
1210 int avio_accept(AVIOContext *s, AVIOContext **c)
1213 AVIOInternal *internal = s->opaque;
1214 URLContext *sc = internal->h;
1215 URLContext *cc = NULL;
1216 ret = ffurl_accept(sc, &cc);
1219 return ffio_fdopen(c, cc);
1222 int avio_handshake(AVIOContext *c)
1224 AVIOInternal *internal = c->opaque;
1225 URLContext *cc = internal->h;
1226 return ffurl_handshake(cc);
1229 /* output in a dynamic buffer */
1231 typedef struct DynBuffer {
1232 int pos, size, allocated_size;
1235 uint8_t io_buffer[1];
1238 static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size)
1240 DynBuffer *d = opaque;
1241 unsigned new_size, new_allocated_size;
1243 /* reallocate buffer if needed */
1244 new_size = d->pos + buf_size;
1245 new_allocated_size = d->allocated_size;
1246 if (new_size < d->pos || new_size > INT_MAX/2)
1248 while (new_size > new_allocated_size) {
1249 if (!new_allocated_size)
1250 new_allocated_size = new_size;
1252 new_allocated_size += new_allocated_size / 2 + 1;
1255 if (new_allocated_size > d->allocated_size) {
1257 if ((err = av_reallocp(&d->buffer, new_allocated_size)) < 0) {
1258 d->allocated_size = 0;
1262 d->allocated_size = new_allocated_size;
1264 memcpy(d->buffer + d->pos, buf, buf_size);
1266 if (d->pos > d->size)
1271 static int dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size)
1273 unsigned char buf1[4];
1276 /* packetized write: output the header */
1277 AV_WB32(buf1, buf_size);
1278 ret = dyn_buf_write(opaque, buf1, 4);
1283 return dyn_buf_write(opaque, buf, buf_size);
1286 static int64_t dyn_buf_seek(void *opaque, int64_t offset, int whence)
1288 DynBuffer *d = opaque;
1290 if (whence == SEEK_CUR)
1292 else if (whence == SEEK_END)
1294 if (offset < 0 || offset > 0x7fffffffLL)
1300 static int url_open_dyn_buf_internal(AVIOContext **s, int max_packet_size)
1303 unsigned io_buffer_size = max_packet_size ? max_packet_size : 1024;
1305 if (sizeof(DynBuffer) + io_buffer_size < io_buffer_size)
1307 d = av_mallocz(sizeof(DynBuffer) + io_buffer_size);
1309 return AVERROR(ENOMEM);
1310 d->io_buffer_size = io_buffer_size;
1311 *s = avio_alloc_context(d->io_buffer, d->io_buffer_size, 1, d, NULL,
1312 max_packet_size ? dyn_packet_buf_write : dyn_buf_write,
1313 max_packet_size ? NULL : dyn_buf_seek);
1316 return AVERROR(ENOMEM);
1318 (*s)->max_packet_size = max_packet_size;
1322 int avio_open_dyn_buf(AVIOContext **s)
1324 return url_open_dyn_buf_internal(s, 0);
1327 int ffio_open_dyn_packet_buf(AVIOContext **s, int max_packet_size)
1329 if (max_packet_size <= 0)
1331 return url_open_dyn_buf_internal(s, max_packet_size);
1334 int avio_get_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
1346 *pbuffer = d->buffer;
1351 int avio_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
1355 static const char padbuf[AV_INPUT_BUFFER_PADDING_SIZE] = {0};
1363 /* don't attempt to pad fixed-size packet buffers */
1364 if (!s->max_packet_size) {
1365 avio_write(s, padbuf, sizeof(padbuf));
1366 padding = AV_INPUT_BUFFER_PADDING_SIZE;
1372 *pbuffer = d->buffer;
1376 avio_context_free(&s);
1378 return size - padding;
1381 void ffio_free_dyn_buf(AVIOContext **s)
1386 avio_close_dyn_buf(*s, &tmp);
1391 static int null_buf_write(void *opaque, uint8_t *buf, int buf_size)
1393 DynBuffer *d = opaque;
1396 if (d->pos > d->size)
1401 int ffio_open_null_buf(AVIOContext **s)
1403 int ret = url_open_dyn_buf_internal(s, 0);
1405 AVIOContext *pb = *s;
1406 pb->write_packet = null_buf_write;
1411 int ffio_close_null_buf(AVIOContext *s)
1413 DynBuffer *d = s->opaque;
1421 avio_context_free(&s);