/*
 * 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

/**
 * 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 av_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);
// FIXME this will be removed ASAP
void ff_rdt_subscribe_rule2(RTPDemuxContext *s, 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 sn will be set to the stream number this packet belongs to
 * @param seq will be set to the sequence number this packet belongs to
 * @param rn will be set to the rule number this packet belongs to
 * @param ts will be set to the timestamp of the packet
 * @return the amount of bytes consumed, or <0 on error
 */
int ff_rdt_parse_header(const uint8_t *buf, int len,
                        int *sn, int *seq, int *rn, uint32_t *ts);

/**
 * Parse RDT-style packet data (header + media data).
 * Usage similar to rtp_parse_packet().
 */
int ff_rdt_parse_packet(RTPDemuxContext *s, AVPacket *pkt,
                        const uint8_t *buf, int len);

#endif /* AVFORMAT_RDT_H */
