blob: ce6026f49c2515ab27fcea40b46ee41445c92519
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 */ |
113 |