3 * This file is part of Libav.
5 * Libav 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 * Libav 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 Libav; 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);
70 * Pause and resume playing - only meaningful if using a network streaming
71 * protocol (e.g. MMS).
72 * @param pause 1 for pause, 0 for resume
74 int ffio_read_pause(AVIOContext *h, int pause);
76 * Seek to a given timestamp relative to some component stream.
77 * Only meaningful if using a network streaming protocol (e.g. MMS.).
78 * @param stream_index The stream index that the timestamp is relative to.
79 * If stream_index is (-1) the timestamp should be in AV_TIME_BASE
80 * units from the beginning of the presentation.
81 * If a stream_index >= 0 is used and the protocol does not support
82 * seeking based on component streams, the call will fail with ENOTSUP.
83 * @param timestamp timestamp in AVStream.time_base units
84 * or if there is no stream specified then in AV_TIME_BASE units.
85 * @param flags Optional combination of AVSEEK_FLAG_BACKWARD, AVSEEK_FLAG_BYTE
86 * and AVSEEK_FLAG_ANY. The protocol may silently ignore
87 * AVSEEK_FLAG_BACKWARD and AVSEEK_FLAG_ANY, but AVSEEK_FLAG_BYTE will
88 * fail with ENOTSUP if used and not supported.
89 * @return >= 0 on success
90 * @see AVInputFormat::read_seek
92 int64_t ffio_read_seek (AVIOContext *h, int stream_index,
93 int64_t timestamp, int flags);
96 int ff_udp_set_remote_url(URLContext *h, const char *uri);
97 int ff_udp_get_local_port(URLContext *h);
99 void ffio_init_checksum(AVIOContext *s,
100 unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len),
101 unsigned long checksum);
102 unsigned long ffio_get_checksum(AVIOContext *s);
103 unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf,
107 * Open a write only packetized memory stream with a maximum packet
108 * size of 'max_packet_size'. The stream is stored in a memory buffer
109 * with a big endian 4 byte header giving the packet size in bytes.
111 * @param s new IO context
112 * @param max_packet_size maximum packet size (must be > 0)
113 * @return zero if no error.
115 int ffio_open_dyn_packet_buf(AVIOContext **s, int max_packet_size);
118 * Create and initialize a AVIOContext for accessing the
119 * resource referenced by the URLContext h.
120 * @note When the URLContext h has been opened in read+write mode, the
121 * AVIOContext can be used only for writing.
123 * @param s Used to return the pointer to the created AVIOContext.
124 * In case of failure the pointed to value is set to NULL.
125 * @return 0 in case of success, a negative value corresponding to an
126 * AVERROR code in case of failure
128 int ffio_fdopen(AVIOContext **s, URLContext *h);
130 #endif // AVFORMAT_AVIO_INTERNAL_H