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/*
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 * Realmedia RTSP (RDT) definitions
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 * Copyright (c) 2007 Ronald S. Bultje <rbultje@ronald.bitfreak.net>
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#ifndef AVFORMAT_RDT_H
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#define AVFORMAT_RDT_H
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#include <stdint.h>
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#include "avformat.h"
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#include "rtpdec.h"
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typedef struct RDTDemuxContext RDTDemuxContext;
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/**
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 * Allocate and init the RDT parsing context.
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 * @param ic the containing RTSP demuxer context
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 * @param first_stream_of_set_idx index to the first AVStream in the RTSP
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 *              demuxer context's ic->streams array that is part of this
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 *              particular stream's set of streams (with identical content)
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 * @param priv_data private data of the payload data handler context
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 * @param handler pointer to the parse_packet() payload parsing function
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 * @return a newly allocated RDTDemuxContext. Free with ff_rdt_parse_close().
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 */
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RDTDemuxContext *ff_rdt_parse_open(AVFormatContext *ic,
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                                   int first_stream_of_set_idx,
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                                   void *priv_data,
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                                   RTPDynamicProtocolHandler *handler);
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void ff_rdt_parse_close(RDTDemuxContext *s);
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/**
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 * Calculate the response (RealChallenge2 in the RTSP header) to the
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 * challenge (RealChallenge1 in the RTSP header from the Real/Helix
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 * server), which is used as some sort of client validation.
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 *
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 * @param response pointer to response buffer, it should be at least 41 bytes
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 *                 (40 data + 1 zero) bytes long.
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 * @param chksum pointer to buffer containing a checksum of the response,
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 *               it should be at least 9 (8 data + 1 zero) bytes long.
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 * @param challenge pointer to the RealChallenge1 value provided by the
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 *                  server.
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 */
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void ff_rdt_calc_response_and_checksum(char response[41], char chksum[9],
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                                       const char *challenge);
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/**
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 * Register RDT-related dynamic payload handlers with our cache.
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 */
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void av_register_rdt_dynamic_payload_handlers(void);
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/**
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 * Add subscription information to Subscribe parameter string.
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 *
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 * @param cmd string to write the subscription information into.
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 * @param size size of cmd.
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 * @param stream_nr stream number.
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 * @param rule_nr rule number to conform to.
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 */
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void ff_rdt_subscribe_rule(char *cmd, int size,
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                           int stream_nr, int rule_nr);
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/**
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 * Parse RDT-style packet header.
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 *
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 * @param buf input buffer
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 * @param len length of input buffer
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 * @param set_id will be set to the set ID this packet belongs to
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 * @param seq_no will be set to the sequence number of the packet
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 * @param stream_id will be set to the stream ID this packet belongs to
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 * @param is_keyframe will be whether this packet belongs to a keyframe
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 * @param timestamp will be set to the timestamp of the packet
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 * @return the amount of bytes consumed, or <0 on error
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 */
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int ff_rdt_parse_header(const uint8_t *buf, int len,
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                        int *set_id, int *seq_no, int *stream_id,
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                        int *is_keyframe, uint32_t *timestamp);
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/**
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 * Parse RDT-style packet data (header + media data).
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 * Usage similar to rtp_parse_packet().
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 */
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int ff_rdt_parse_packet(RDTDemuxContext *s, AVPacket *pkt,
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                        const uint8_t *buf, int len);
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/**
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 * Parse a server-related SDP line.
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 *
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 * @param s the RTSP AVFormatContext
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 * @param stream_index the index of the first stream in the set represented
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 *               by the SDP m= line (in s->streams)
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 * @param buf the SDP line
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 */
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void ff_real_parse_sdp_a_line(AVFormatContext *s, int stream_index,
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                              const char *buf);
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#endif /* AVFORMAT_RDT_H */