| 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 */ |