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rdt.h
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1 /*
2  * Realmedia RTSP (RDT) definitions
3  * Copyright (c) 2007 Ronald S. Bultje <rbultje@ronald.bitfreak.net>
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_RDT_H
23 #define AVFORMAT_RDT_H
24 
25 #include <stdint.h>
26 #include "avformat.h"
27 #include "rtpdec.h"
28 
29 typedef struct RDTDemuxContext RDTDemuxContext;
30 
31 /**
32  * Allocate and init the RDT parsing context.
33  * @param ic the containing RTSP demuxer context
34  * @param first_stream_of_set_idx index to the first AVStream in the RTSP
35  * demuxer context's ic->streams array that is part of this
36  * particular stream's set of streams (with identical content)
37  * @param priv_data private data of the payload data handler context
38  * @param handler pointer to the parse_packet() payload parsing function
39  * @return a newly allocated RDTDemuxContext. Free with ff_rdt_parse_close().
40  */
42  int first_stream_of_set_idx,
43  void *priv_data,
46 
47 /**
48  * Calculate the response (RealChallenge2 in the RTSP header) to the
49  * challenge (RealChallenge1 in the RTSP header from the Real/Helix
50  * server), which is used as some sort of client validation.
51  *
52  * @param response pointer to response buffer, it should be at least 41 bytes
53  * (40 data + 1 zero) bytes long.
54  * @param chksum pointer to buffer containing a checksum of the response,
55  * it should be at least 9 (8 data + 1 zero) bytes long.
56  * @param challenge pointer to the RealChallenge1 value provided by the
57  * server.
58  */
59 void ff_rdt_calc_response_and_checksum(char response[41], char chksum[9],
60  const char *challenge);
61 
62 /**
63  * Register RDT-related dynamic payload handlers with our cache.
64  */
66 
67 /**
68  * Add subscription information to Subscribe parameter string.
69  *
70  * @param cmd string to write the subscription information into.
71  * @param size size of cmd.
72  * @param stream_nr stream number.
73  * @param rule_nr rule number to conform to.
74  */
75 void ff_rdt_subscribe_rule(char *cmd, int size,
76  int stream_nr, int rule_nr);
77 
78 /**
79  * Parse RDT-style packet header.
80  *
81  * @param buf input buffer
82  * @param len length of input buffer
83  * @param pset_id will be set to the set ID this packet belongs to
84  * @param pseq_no will be set to the sequence number of the packet
85  * @param pstream_id will be set to the stream ID this packet belongs to
86  * @param pis_keyframe will be whether this packet belongs to a keyframe
87  * @param ptimestamp will be set to the timestamp of the packet
88  * @return the amount of bytes consumed, or negative on error
89  */
90 int ff_rdt_parse_header(const uint8_t *buf, int len,
91  int *pset_id, int *pseq_no, int *pstream_id,
92  int *pis_keyframe, uint32_t *ptimestamp);
93 
94 /**
95  * Parse RDT-style packet data (header + media data).
96  * Usage similar to rtp_parse_packet().
97  */
99  uint8_t **buf, int len);
100 
101 /**
102  * Parse a server-related SDP line.
103  *
104  * @param s the RTSP AVFormatContext
105  * @param stream_index the index of the first stream in the set represented
106  * by the SDP m= line (in s->streams)
107  * @param buf the SDP line
108  */
109 void ff_real_parse_sdp_a_line(AVFormatContext *s, int stream_index,
110  const char *buf);
111 
112 #endif /* AVFORMAT_RDT_H */
const char * s
Definition: avisynth_c.h:631
void ff_real_parse_sdp_a_line(AVFormatContext *s, int stream_index, const char *buf)
Parse a server-related SDP line.
Definition: rdt.c:515
RDTDemuxContext * ff_rdt_parse_open(AVFormatContext *ic, int first_stream_of_set_idx, void *priv_data, RTPDynamicProtocolHandler *handler)
Allocate and init the RDT parsing context.
Definition: rdt.c:55
static AVPacket pkt
Format I/O context.
Definition: avformat.h:1272
uint8_t
static void handler(vbi_event *ev, void *user_data)
ptrdiff_t size
Definition: opengl_enc.c:101
void ff_rdt_calc_response_and_checksum(char response[41], char chksum[9], const char *challenge)
Calculate the response (RealChallenge2 in the RTSP header) to the challenge (RealChallenge1 in the RT...
Definition: rdt.c:94
AVFormatContext * ic
the containing (RTSP) demux context
Definition: rdt.c:40
int ff_rdt_parse_packet(RDTDemuxContext *s, AVPacket *pkt, uint8_t **buf, int len)
Parse RDT-style packet data (header + media data).
Definition: rdt.c:335
int ff_rdt_parse_header(const uint8_t *buf, int len, int *pset_id, int *pseq_no, int *pstream_id, int *pis_keyframe, uint32_t *ptimestamp)
Parse RDT-style packet header.
Definition: rdt.c:190
void ff_rdt_subscribe_rule(char *cmd, int size, int stream_nr, int rule_nr)
Add subscription information to Subscribe parameter string.
Definition: rdt.c:384
void * buf
Definition: avisynth_c.h:553
Main libavformat public API header.
void ff_register_rdt_dynamic_payload_handlers(void)
Register RDT-related dynamic payload handlers with our cache.
Definition: rdt.c:573
int len
void ff_rdt_parse_close(RDTDemuxContext *s)
Definition: rdt.c:78
This structure stores compressed data.
Definition: avcodec.h:1399