/*
  * Realmedia RTSP (RDT) definitions
  * Copyright (c) 2007 Ronald S. Bultje <rbultje@ronald.bitfreak.net>
  *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef AVFORMAT_RDT_H
 #define AVFORMAT_RDT_H
 

 #include <stdint.h>
 #include "avformat.h"

 #include "rtpdec.h"

 typedef struct RDTDemuxContext RDTDemuxContext;
 

 /**
  * Allocate and init the RDT parsing context.
  * @param ic the containing RTSP demuxer context
  * @param first_stream_of_set_idx index to the first AVStream in the RTSP
  *              demuxer context's ic->streams array that is part of this
  *              particular stream's set of streams (with identical content)
  * @param priv_data private data of the payload data handler context
  * @param handler pointer to the parse_packet() payload parsing function
  * @return a newly allocated RDTDemuxContext. Free with ff_rdt_parse_close().
  */

 RDTDemuxContext *ff_rdt_parse_open(AVFormatContext *ic,
                                    int first_stream_of_set_idx,

                                    void *priv_data,
                                    RTPDynamicProtocolHandler *handler);
 void ff_rdt_parse_close(RDTDemuxContext *s);
 

 /**
  * Calculate the response (RealChallenge2 in the RTSP header) to the
  * challenge (RealChallenge1 in the RTSP header from the Real/Helix
  * server), which is used as some sort of client validation.
  *
  * @param response pointer to response buffer, it should be at least 41 bytes
  *                 (40 data + 1 zero) bytes long.
  * @param chksum pointer to buffer containing a checksum of the response,
  *               it should be at least 9 (8 data + 1 zero) bytes long.
  * @param challenge pointer to the RealChallenge1 value provided by the
  *                  server.
  */
 void ff_rdt_calc_response_and_checksum(char response[41], char chksum[9],
                                        const char *challenge);
 

 /**
  * Register RDT-related dynamic payload handlers with our cache.
  */

 void ff_register_rdt_dynamic_payload_handlers(void);

 /**
  * Add subscription information to Subscribe parameter string.
  *
  * @param cmd string to write the subscription information into.
  * @param size size of cmd.
  * @param stream_nr stream number.
  * @param rule_nr rule number to conform to.
  */

 void ff_rdt_subscribe_rule(char *cmd, int size,

                            int stream_nr, int rule_nr);
 

 /**

  * Parse RDT-style packet header.
  *
  * @param buf input buffer
  * @param len length of input buffer

  * @param pset_id will be set to the set ID this packet belongs to
  * @param pseq_no will be set to the sequence number of the packet
  * @param pstream_id will be set to the stream ID this packet belongs to
  * @param pis_keyframe will be whether this packet belongs to a keyframe
  * @param ptimestamp will be set to the timestamp of the packet

  * @return the amount of bytes consumed, or negative on error

  */
 int ff_rdt_parse_header(const uint8_t *buf, int len,

                         int *pset_id, int *pseq_no, int *pstream_id,
                         int *pis_keyframe, uint32_t *ptimestamp);

 
 /**

  * Parse RDT-style packet data (header + media data).
  * Usage similar to rtp_parse_packet().
  */

 int ff_rdt_parse_packet(RDTDemuxContext *s, AVPacket *pkt,

                         uint8_t **buf, int len);

 /**
  * Parse a server-related SDP line.
  *
  * @param s the RTSP AVFormatContext
  * @param stream_index the index of the first stream in the set represented
  *               by the SDP m= line (in s->streams)
  * @param buf the SDP line
  */
 void ff_real_parse_sdp_a_line(AVFormatContext *s, int stream_index,
                               const char *buf);
 

 #endif /* AVFORMAT_RDT_H */