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 s RDT context
  49  * @param cmd string to write the subscription information into.
  50  * @param size size of cmd.
  51  * @param stream_nr stream number.
  52  * @param rule_nr rule number to conform to.
  53  */
  54 void ff_rdt_subscribe_rule(RTPDemuxContext *s, char *cmd, int size,
  55                            int stream_nr, int rule_nr);
  56
  57 /**
  58  * Parse RDT-style packet data (header + media data).
  59  * Usage similar to rtp_parse_packet().
  60  */
  61 int ff_rdt_parse_packet(RTPDemuxContext *s, AVPacket *pkt,
  62                         const uint8_t *buf, int len);
  63
  64 #endif /* AVFORMAT_RDT_H */