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1 | /* |
2 | * "Real" compatible muxer and demuxer. | |
3 | * Copyright (c) 2000, 2001 Fabrice Bellard | |
4 | * | |
5 | * This file is part of FFmpeg. | |
6 | * | |
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. | |
11 | * | |
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. | |
16 | * | |
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 | |
20 | */ | |
21 | ||
22 | #ifndef AVFORMAT_RM_H | |
23 | #define AVFORMAT_RM_H | |
24 | ||
25 | #include "avformat.h" | |
26 | #include "internal.h" | |
27 | ||
28 | extern const char * const ff_rm_metadata[4]; | |
29 | extern const AVCodecTag ff_rm_codec_tags[]; | |
30 | ||
31 | typedef struct RMStream RMStream; | |
32 | ||
33 | RMStream *ff_rm_alloc_rmstream (void); | |
34 | void ff_rm_free_rmstream (RMStream *rms); | |
35 | ||
36 | /*< input format for Realmedia-style RTSP streams */ | |
37 | extern AVInputFormat ff_rdt_demuxer; | |
38 | ||
39 | /** | |
40 | * Read the MDPR chunk, which contains stream-specific codec initialization | |
41 | * parameters. | |
42 | * | |
43 | * @param s context containing RMContext and AVIOContext for stream reading | |
44 | * @param pb context to read the data from | |
45 | * @param st the stream that the MDPR chunk belongs to and where to store the | |
46 | * parameters read from the chunk into | |
47 | * @param rst real-specific stream information | |
48 | * @param codec_data_size size of the MDPR chunk | |
49 | * @return 0 on success, errno codes on error | |
50 | */ | |
51 | int ff_rm_read_mdpr_codecdata (AVFormatContext *s, AVIOContext *pb, | |
52 | AVStream *st, RMStream *rst, | |
53 | int codec_data_size, const uint8_t *mime); | |
54 | ||
55 | /** | |
56 | * Parse one rm-stream packet from the input bytestream. | |
57 | * | |
58 | * @param s context containing RMContext and AVIOContext for stream reading | |
59 | * @param pb context to read the data from | |
60 | * @param st stream to which the packet to be read belongs | |
61 | * @param rst Real-specific stream information | |
62 | * @param len packet length to read from the input | |
63 | * @param pkt packet location to store the parsed packet data | |
64 | * @param seq pointer to an integer containing the sequence number, may be | |
65 | * updated | |
66 | * @param flags the packet flags | |
67 | * @param ts timestamp of the current packet | |
68 | * @return <0 on error, 0 if a packet was placed in the pkt pointer. A | |
69 | * value >0 means that no data was placed in pkt, but that cached | |
70 | * data is available by calling ff_rm_retrieve_cache(). | |
71 | */ | |
72 | int ff_rm_parse_packet (AVFormatContext *s, AVIOContext *pb, | |
73 | AVStream *st, RMStream *rst, int len, | |
74 | AVPacket *pkt, int *seq, int flags, int64_t ts); | |
75 | ||
76 | /** | |
77 | * Retrieve one cached packet from the rm-context. The real container can | |
78 | * store several packets (as interpreted by the codec) in a single container | |
79 | * packet, which means the demuxer holds some back when the first container | |
80 | * packet is parsed and returned. The result is that rm->audio_pkt_cnt is | |
81 | * a positive number, the amount of cached packets. Using this function, each | |
82 | * of those packets can be retrieved sequentially. | |
83 | * | |
84 | * @param s context containing RMContext and AVIOContext for stream reading | |
85 | * @param pb context to read the data from | |
86 | * @param st stream that this packet belongs to | |
87 | * @param rst Real-specific stream information | |
88 | * @param pkt location to store the packet data | |
89 | * @return the number of samples left for subsequent calls to this same | |
90 | * function, or 0 if all samples have been retrieved. | |
91 | */ | |
92 | int ff_rm_retrieve_cache (AVFormatContext *s, AVIOContext *pb, | |
93 | AVStream *st, RMStream *rst, AVPacket *pkt); | |
94 | ||
95 | #endif /* AVFORMAT_RM_H */ |