FFmpeg
rm.h
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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 
34 void ff_rm_free_rmstream (RMStream *rms);
35 
36 /*< input format for Realmedia-style RTSP streams */
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  */
52  AVStream *st, RMStream *rst,
53  unsigned 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  */
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  */
93  AVStream *st, RMStream *rst, AVPacket *pkt);
94 
95 #endif /* AVFORMAT_RM_H */
Bytestream IO Context.
Definition: avio.h:161
const AVCodecTag ff_rm_codec_tags[]
Definition: rm.c:31
RMStream * ff_rm_alloc_rmstream(void)
Definition: rmdec.c:109
Definition: rmdec.c:43
static AVPacket pkt
Format I/O context.
Definition: avformat.h:1358
uint8_t
int ff_rm_parse_packet(AVFormatContext *s, AVIOContext *pb, AVStream *st, RMStream *rst, int len, AVPacket *pkt, int *seq, int flags, int64_t ts)
Parse one rm-stream packet from the input bytestream.
Definition: rmdec.c:882
int ff_rm_read_mdpr_codecdata(AVFormatContext *s, AVIOContext *pb, AVStream *st, RMStream *rst, unsigned int codec_data_size, const uint8_t *mime)
Read the MDPR chunk, which contains stream-specific codec initialization parameters.
Definition: rmdec.c:311
#define s(width, name)
Definition: cbs_vp9.c:257
Stream structure.
Definition: avformat.h:881
int ff_rm_retrieve_cache(AVFormatContext *s, AVIOContext *pb, AVStream *st, RMStream *rst, AVPacket *pkt)
Retrieve one cached packet from the rm-context.
Definition: rmdec.c:970
#define flags(name, subs,...)
Definition: cbs_av1.c:561
Main libavformat public API header.
void ff_rm_free_rmstream(RMStream *rms)
Definition: rmdec.c:118
int len
AVInputFormat ff_rdt_demuxer
Definition: rmdec.c:1153
This structure stores compressed data.
Definition: avcodec.h:1457
const char *const ff_rm_metadata[4]
Definition: rm.c:24