/*
 * RTMP definitions
 * Copyright (c) 2009 Kostya Shishkov
 *
 * 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_RTMP_H
#define AVFORMAT_RTMP_H

#include "avformat.h"

#define RTMP_DEFAULT_PORT 1935
#define RTMPS_DEFAULT_PORT 443

#define RTMP_HANDSHAKE_PACKET_SIZE 1536

#define HMAC_IPAD_VAL 0x36
#define HMAC_OPAD_VAL 0x5C

/**
 * A non-zero transaction id requires the server to send back
 * a _result or _error response.
 * Setting it to 0 marks the message as a notification not
 * requiring feedback.
 */

#define RTMP_NOTIFICATION 0

/**
 * emulated Flash client version - 9.0.124.2 on Linux
 * @{
 */
#define RTMP_CLIENT_PLATFORM "LNX"
#define RTMP_CLIENT_VER1    9
#define RTMP_CLIENT_VER2    0
#define RTMP_CLIENT_VER3  124
#define RTMP_CLIENT_VER4    2
/** @} */ //version defines

/**
 * Calculate HMAC-SHA2 digest for RTMP handshake packets.
 *
 * @param src    input buffer
 * @param len    input buffer length (should be 1536)
 * @param gap    offset in buffer where 32 bytes should not be taken into account
 *               when calculating digest (since it will be used to store that digest)
 * @param key    digest key
 * @param keylen digest key length
 * @param dst    buffer where calculated digest will be stored (32 bytes)
 */
int ff_rtmp_calc_digest(const uint8_t *src, int len, int gap,
                        const uint8_t *key, int keylen, uint8_t *dst);

/**
 * Calculate digest position for RTMP handshake packets.
 *
 * @param buf input buffer (should be 1536 bytes)
 * @param off offset in buffer where to start calculating digest position
 * @param mod_val value used for computing modulo
 * @param add_val value added at the end (after computing modulo)
 */
int ff_rtmp_calc_digest_pos(const uint8_t *buf, int off, int mod_val,
                            int add_val);

#endif /* AVFORMAT_RTMP_H */