2fe11873ac985fba10d0823bc0ea745d09e5c9a7
[libav.git] / libavformat / rdt.h
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 /**
26 * Calculate the response (RealChallenge2 in the RTSP header) to the
27 * challenge (RealChallenge1 in the RTSP header from the Real/Helix
28 * server), which is used as some sort of client validation.
29 *
30 * @param response pointer to response buffer, it should be at least 41 bytes
31 * (40 data + 1 zero) bytes long.
32 * @param chksum pointer to buffer containing a checksum of the response,
33 * it should be at least 9 (8 data + 1 zero) bytes long.
34 * @param challenge pointer to the RealChallenge1 value provided by the
35 * server.
36 */
37 void ff_rdt_calc_response_and_checksum(char response[41], char chksum[9],
38 const char *challenge);
39
40 /**
41 * Register RDT-related dynamic payload handlers with our cache.
42 */
43 void av_register_rdt_dynamic_payload_handlers(void);
44
45 /**
46 * Add subscription information to Subscribe parameter string.
47 *
48 * @param cmd string to write the subscription information into.
49 * @param size size of cmd.
50 * @param stream_nr stream number.
51 * @param rule_nr rule number to conform to.
52 */
53 void ff_rdt_subscribe_rule(char *cmd, int size,
54 int stream_nr, int rule_nr);
55 // FIXME this will be removed ASAP
56 void ff_rdt_subscribe_rule2(RTPDemuxContext *s, char *cmd, int size,
57 int stream_nr, int rule_nr);
58
59 /**
60 * Parse RDT-style packet header.
61 *
62 * @param buf input buffer
63 * @param len length of input buffer
64 * @param sn will be set to the stream number this packet belongs to
65 * @param seq will be set to the sequence number this packet belongs to
66 * @param rn will be set to the rule number this packet belongs to
67 * @param ts will be set to the timestamp of the packet
68 * @return the amount of bytes consumed, or <0 on error
69 */
70 int ff_rdt_parse_header(const uint8_t *buf, int len,
71 int *sn, int *seq, int *rn, uint32_t *ts);
72
73 /**
74 * Parse RDT-style packet data (header + media data).
75 * Usage similar to rtp_parse_packet().
76 */
77 int ff_rdt_parse_packet(RTPDemuxContext *s, AVPacket *pkt,
78 const uint8_t *buf, int len);
79
80 #endif /* AVFORMAT_RDT_H */