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 Libav.
   6  *
   7  * Libav 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  * Libav 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 Libav; 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 av_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 */