2 * "Real" compatible muxer and demuxer.
3 * Copyright (c) 2000, 2001 Fabrice Bellard
5 * This file is part of Libav.
7 * Libav 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 * Libav 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 Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
28 extern const char * const ff_rm_metadata[4];
29 extern const unsigned char ff_sipr_subpk_size[4];
30 extern const AVCodecTag ff_rm_codec_tags[];
32 typedef struct RMStream RMStream;
34 RMStream *ff_rm_alloc_rmstream (void);
35 void ff_rm_free_rmstream (RMStream *rms);
37 /*< input format for Realmedia-style RTSP streams */
38 extern AVInputFormat ff_rdt_demuxer;
41 * Read the MDPR chunk, which contains stream-specific codec initialization
44 * @param s context containing RMContext and AVIOContext for stream reading
45 * @param pb context to read the data from
46 * @param st the stream that the MDPR chunk belongs to and where to store the
47 * parameters read from the chunk into
48 * @param rst real-specific stream information
49 * @param codec_data_size size of the MDPR chunk
50 * @return 0 on success, errno codes on error
52 int ff_rm_read_mdpr_codecdata (AVFormatContext *s, AVIOContext *pb,
53 AVStream *st, RMStream *rst,
57 * Parse one rm-stream packet from the input bytestream.
59 * @param s context containing RMContext and AVIOContext for stream reading
60 * @param pb context to read the data from
61 * @param st stream to which the packet to be read belongs
62 * @param rst Real-specific stream information
63 * @param len packet length to read from the input
64 * @param pkt packet location to store the parsed packet data
65 * @param seq pointer to an integer containing the sequence number, may be
67 * @param flags the packet flags
68 * @param ts timestamp of the current packet
69 * @return <0 on error, 0 if a packet was placed in the pkt pointer. A
70 * value >0 means that no data was placed in pkt, but that cached
71 * data is available by calling ff_rm_retrieve_cache().
73 int ff_rm_parse_packet (AVFormatContext *s, AVIOContext *pb,
74 AVStream *st, RMStream *rst, int len,
75 AVPacket *pkt, int *seq, int flags, int64_t ts);
78 * Retrieve one cached packet from the rm-context. The real container can
79 * store several packets (as interpreted by the codec) in a single container
80 * packet, which means the demuxer holds some back when the first container
81 * packet is parsed and returned. The result is that rm->audio_pkt_cnt is
82 * a positive number, the amount of cached packets. Using this function, each
83 * of those packets can be retrieved sequentially.
85 * @param s context containing RMContext and AVIOContext for stream reading
86 * @param pb context to read the data from
87 * @param st stream that this packet belongs to
88 * @param rst Real-specific stream information
89 * @param pkt location to store the packet data
90 * @return the number of samples left for subsequent calls to this same
91 * function, or 0 if all samples have been retrieved.
93 int ff_rm_retrieve_cache (AVFormatContext *s, AVIOContext *pb,
94 AVStream *st, RMStream *rst, AVPacket *pkt);
97 * Perform 4-bit block reordering for SIPR data.
99 * @param buf SIPR data
101 void ff_rm_reorder_sipr_data(uint8_t *buf, int sub_packet_h, int framesize);
103 #endif /* AVFORMAT_RM_H */