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6147 | serge | 1 | /* |
2 | * Realmedia RTSP (RDT) definitions |
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3 | * Copyright (c) 2007 Ronald S. Bultje |
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4 | * |
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5 | * This file is part of FFmpeg. |
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6 | * |
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7 | * FFmpeg is free software; you can redistribute it and/or |
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8 | * modify it under the terms of the GNU Lesser General Public |
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9 | * License as published by the Free Software Foundation; either |
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10 | * version 2.1 of the License, or (at your option) any later version. |
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11 | * |
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12 | * FFmpeg is distributed in the hope that it will be useful, |
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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15 | * Lesser General Public License for more details. |
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16 | * |
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17 | * You should have received a copy of the GNU Lesser General Public |
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18 | * License along with FFmpeg; if not, write to the Free Software |
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19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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20 | */ |
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21 | |||
22 | #ifndef AVFORMAT_RDT_H |
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23 | #define AVFORMAT_RDT_H |
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24 | |||
25 | #include |
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26 | #include "avformat.h" |
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27 | #include "rtpdec.h" |
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28 | |||
29 | typedef struct RDTDemuxContext RDTDemuxContext; |
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30 | |||
31 | /** |
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32 | * Allocate and init the RDT parsing context. |
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33 | * @param ic the containing RTSP demuxer context |
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34 | * @param first_stream_of_set_idx index to the first AVStream in the RTSP |
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35 | * demuxer context's ic->streams array that is part of this |
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36 | * particular stream's set of streams (with identical content) |
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37 | * @param priv_data private data of the payload data handler context |
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38 | * @param handler pointer to the parse_packet() payload parsing function |
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39 | * @return a newly allocated RDTDemuxContext. Free with ff_rdt_parse_close(). |
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40 | */ |
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41 | RDTDemuxContext *ff_rdt_parse_open(AVFormatContext *ic, |
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42 | int first_stream_of_set_idx, |
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43 | void *priv_data, |
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44 | RTPDynamicProtocolHandler *handler); |
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45 | void ff_rdt_parse_close(RDTDemuxContext *s); |
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46 | |||
47 | /** |
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48 | * Calculate the response (RealChallenge2 in the RTSP header) to the |
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49 | * challenge (RealChallenge1 in the RTSP header from the Real/Helix |
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50 | * server), which is used as some sort of client validation. |
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51 | * |
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52 | * @param response pointer to response buffer, it should be at least 41 bytes |
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53 | * (40 data + 1 zero) bytes long. |
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54 | * @param chksum pointer to buffer containing a checksum of the response, |
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55 | * it should be at least 9 (8 data + 1 zero) bytes long. |
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56 | * @param challenge pointer to the RealChallenge1 value provided by the |
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57 | * server. |
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58 | */ |
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59 | void ff_rdt_calc_response_and_checksum(char response[41], char chksum[9], |
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60 | const char *challenge); |
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61 | |||
62 | /** |
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63 | * Register RDT-related dynamic payload handlers with our cache. |
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64 | */ |
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65 | void ff_register_rdt_dynamic_payload_handlers(void); |
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66 | |||
67 | /** |
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68 | * Add subscription information to Subscribe parameter string. |
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69 | * |
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70 | * @param cmd string to write the subscription information into. |
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71 | * @param size size of cmd. |
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72 | * @param stream_nr stream number. |
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73 | * @param rule_nr rule number to conform to. |
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74 | */ |
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75 | void ff_rdt_subscribe_rule(char *cmd, int size, |
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76 | int stream_nr, int rule_nr); |
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77 | |||
78 | /** |
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79 | * Parse RDT-style packet header. |
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80 | * |
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81 | * @param buf input buffer |
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82 | * @param len length of input buffer |
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83 | * @param pset_id will be set to the set ID this packet belongs to |
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84 | * @param pseq_no will be set to the sequence number of the packet |
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85 | * @param pstream_id will be set to the stream ID this packet belongs to |
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86 | * @param pis_keyframe will be whether this packet belongs to a keyframe |
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87 | * @param ptimestamp will be set to the timestamp of the packet |
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88 | * @return the amount of bytes consumed, or negative on error |
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89 | */ |
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90 | int ff_rdt_parse_header(const uint8_t *buf, int len, |
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91 | int *pset_id, int *pseq_no, int *pstream_id, |
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92 | int *pis_keyframe, uint32_t *ptimestamp); |
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93 | |||
94 | /** |
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95 | * Parse RDT-style packet data (header + media data). |
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96 | * Usage similar to rtp_parse_packet(). |
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97 | */ |
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98 | int ff_rdt_parse_packet(RDTDemuxContext *s, AVPacket *pkt, |
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99 | uint8_t **buf, int len); |
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100 | |||
101 | /** |
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102 | * Parse a server-related SDP line. |
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103 | * |
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104 | * @param s the RTSP AVFormatContext |
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105 | * @param stream_index the index of the first stream in the set represented |
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106 | * by the SDP m= line (in s->streams) |
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107 | * @param buf the SDP line |
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108 | */ |
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109 | void ff_real_parse_sdp_a_line(AVFormatContext *s, int stream_index, |
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110 | const char *buf); |
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111 | |||
112 | #endif /* AVFORMAT_RDT_H */ |