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 29typedef 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 */ 41RDTDemuxContext *ff_rdt_parse_open(AVFormatContext *ic, 42 int first_stream_of_set_idx, 43 void *priv_data, 44 const RTPDynamicProtocolHandler *handler); 45void 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 */ 59void ff_rdt_calc_response_and_checksum(char response[41], char chksum[9], 60 const char *challenge); 61 62/** 63 * Add subscription information to Subscribe parameter string. 64 * 65 * @param cmd string to write the subscription information into. 66 * @param size size of cmd. 67 * @param stream_nr stream number. 68 * @param rule_nr rule number to conform to. 69 */ 70void ff_rdt_subscribe_rule(char *cmd, int size, 71 int stream_nr, int rule_nr); 72 73/** 74 * Parse RDT-style packet header. 75 * 76 * @param buf input buffer 77 * @param len length of input buffer 78 * @param pset_id will be set to the set ID this packet belongs to 79 * @param pseq_no will be set to the sequence number of the packet 80 * @param pstream_id will be set to the stream ID this packet belongs to 81 * @param pis_keyframe will be whether this packet belongs to a keyframe 82 * @param ptimestamp will be set to the timestamp of the packet 83 * @return the amount of bytes consumed, or negative on error 84 */ 85int ff_rdt_parse_header(const uint8_t *buf, int len, 86 int *pset_id, int *pseq_no, int *pstream_id, 87 int *pis_keyframe, uint32_t *ptimestamp); 88 89/** 90 * Parse RDT-style packet data (header + media data). 91 * Usage similar to rtp_parse_packet(). 92 */ 93int ff_rdt_parse_packet(RDTDemuxContext *s, AVPacket *pkt, 94 uint8_t **buf, int len); 95 96/** 97 * Parse a server-related SDP line. 98 * 99 * @param s the RTSP AVFormatContext 100 * @param stream_index the index of the first stream in the set represented 101 * by the SDP m= line (in s->streams) 102 * @param buf the SDP line 103 */ 104void ff_real_parse_sdp_a_line(AVFormatContext *s, int stream_index, 105 const char *buf); 106 107#endif /* AVFORMAT_RDT_H */ 108