/***
    This file is part of snapcast
    Copyright (C) 2014-2018  Johannes Pohl

    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 3 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, see <http://www.gnu.org/licenses/>.
***/

#include <memory>
#include "common/endian.hpp"
#include "pcmEncoder.h"


#define ID_RIFF 0x46464952
#define ID_WAVE 0x45564157
#define ID_FMT  0x20746d66
#define ID_DATA 0x61746164


PcmEncoder::PcmEncoder(const std::string& codecOptions) : Encoder(codecOptions)
{
	headerChunk_.reset(new msg::CodecHeader("pcm"));
}


void PcmEncoder::encode(const msg::PcmChunk* chunk)
{
	msg::PcmChunk* pcmChunk = new msg::PcmChunk(*chunk);
	listener_->onChunkEncoded(this, pcmChunk, pcmChunk->duration<chronos::msec>().count());
}


void PcmEncoder::initEncoder()
{
	headerChunk_->payloadSize = 44;
	headerChunk_->payload = (char*)malloc(headerChunk_->payloadSize);
	char* payload = headerChunk_->payload;
	assign(payload, SWAP_32(ID_RIFF));
	assign(payload + 4, SWAP_32(36));
	assign(payload + 8, SWAP_32(ID_WAVE));
	assign(payload + 12, SWAP_32(ID_FMT));
	assign(payload + 16, SWAP_32(16));
	assign(payload + 20, SWAP_16(1));
	assign(payload + 22, SWAP_16(sampleFormat_.channels));
	assign(payload + 24, SWAP_32(sampleFormat_.rate));
	assign(payload + 28, SWAP_32(sampleFormat_.rate * sampleFormat_.bits * sampleFormat_.channels / 8));
	assign(payload + 32, SWAP_16(sampleFormat_.channels * ((sampleFormat_.bits + 7) / 8)));
	assign(payload + 34, SWAP_16(sampleFormat_.bits));
	assign(payload + 36, SWAP_32(ID_DATA));
	assign(payload + 40, SWAP_32(0));
}


std::string PcmEncoder::name() const
{
	return "pcm";
}