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/*
* Copyright 2003-2021 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef MPD_OUTPUT_SNAPCAST_PROTOCOL_HXX
#define MPD_OUTPUT_SNAPCAST_PROTOCOL_HXX
#include "util/ByteOrder.hxx"
// see https://github.com/badaix/snapcast/blob/master/doc/binary_protocol.md
enum class SnapcastMessageType : uint16_t {
CODEC_HEADER = 1,
WIRE_CHUNK = 2,
SERVER_SETTINGS = 3,
TIME = 4,
HELLO = 5,
STREAM_TAGS = 6,
};
struct SnapcastTimestamp {
PackedLE32 sec, usec;
constexpr SnapcastTimestamp operator-(SnapcastTimestamp other) const noexcept {
const uint32_t a_sec = sec, a_usec = usec;
const uint32_t b_sec = other.sec, b_usec = other.usec;
uint32_t result_sec = a_sec - b_sec;
uint32_t result_usec = a_usec - b_usec;
if (a_usec < b_usec) {
--result_sec;
result_usec += 1'000'000;
}
return {result_sec, result_usec};
}
};
struct SnapcastBase {
PackedLE16 type;
PackedLE16 id;
PackedLE16 refers_to;
SnapcastTimestamp sent;
SnapcastTimestamp received;
PackedLE32 size;
};
static_assert(sizeof(SnapcastBase) == 26);
struct SnapcastWireChunk {
SnapcastTimestamp timestamp;
PackedLE32 size;
};
struct SnapcastTime {
SnapcastTimestamp latency;
};
#endif