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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 | */ | |
41 | RDTDemuxContext *ff_rdt_parse_open(AVFormatContext *ic, | |
42 | int first_stream_of_set_idx, | |
43 | void *priv_data, | |
44 | RTPDynamicProtocolHandler *handler); | |
45 | void ff_rdt_parse_close(RDTDemuxContext *s); | |
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 | */ | |
65 | void ff_register_rdt_dynamic_payload_handlers(void); | |
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 | */ | |
98 | int ff_rdt_parse_packet(RDTDemuxContext *s, AVPacket *pkt, | |
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 */ |