3 * This file is part of FFmpeg.
5 * FFmpeg is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2.1 of the License, or (at your option) any later version.
10 * FFmpeg is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with FFmpeg; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 #ifndef AVFORMAT_AVIO_INTERNAL_H
21 #define AVFORMAT_AVIO_INTERNAL_H
25 int ffio_init_context(AVIOContext *s,
26 unsigned char *buffer,
30 int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
31 int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
32 int64_t (*seek)(void *opaque, int64_t offset, int whence));
36 * Read size bytes from AVIOContext into buf.
37 * This reads at most 1 packet. If that is not enough fewer bytes will be
39 * @return number of bytes read or AVERROR
41 int ffio_read_partial(AVIOContext *s, unsigned char *buf, int size);
43 void ffio_fill(AVIOContext *s, int b, int count);
45 static av_always_inline void ffio_wfourcc(AVIOContext *pb, const uint8_t *s)
47 avio_wl32(pb, MKTAG(s[0], s[1], s[2], s[3]));
51 * Rewind the AVIOContext using the specified buffer containing the first buf_size bytes of the file.
52 * Used after probing to avoid seeking.
53 * Joins buf and s->buffer, taking any overlap into consideration.
54 * @note s->buffer must overlap with buf or they can't be joined and the function fails
56 * @param s The read-only AVIOContext to rewind
57 * @param buf The probe buffer containing the first buf_size bytes of the file
58 * @param buf_size The size of buf
59 * @return 0 in case of success, a negative value corresponding to an
60 * AVERROR code in case of failure
62 int ffio_rewind_with_probe_data(AVIOContext *s, unsigned char *buf, int buf_size);
64 uint64_t ffio_read_varlen(AVIOContext *bc);
66 /** @warning must be called before any I/O */
67 int ffio_set_buf_size(AVIOContext *s, int buf_size);
69 int ffio_read_pause(AVIOContext *h, int pause);
70 int64_t ffio_read_seek (AVIOContext *h, int stream_index,
71 int64_t timestamp, int flags);
74 int ff_udp_set_remote_url(URLContext *h, const char *uri);
75 int ff_udp_get_local_port(URLContext *h);
77 void ffio_init_checksum(AVIOContext *s,
78 unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len),
79 unsigned long checksum);
80 unsigned long ffio_get_checksum(AVIOContext *s);
81 unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf,
84 #endif // AVFORMAT_AVIO_INTERNAL_H