/***
	This file is part of snapcast
	Copyright (C) 2015  Hannes Ellinger

	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 "opusDecoder.h"
#include "common/log.h"


OpusDecoderWrapper::OpusDecoderWrapper() : Decoder() {
	int error;

	dec = opus_decoder_create(48000, 2, &error); // fixme
	if(error != 0) {
		logE << "Failed to initialize opus decoder: " << error << '\n';
		logE << " Rate:     " << 48000 << '\n';
		logE << " Channels: " << 2 << '\n';
	}
}


OpusDecoderWrapper::~OpusDecoderWrapper() {}


bool OpusDecoderWrapper::decode(msg::PcmChunk* chunk) {
	int samples = 480;
	// reserve space for decoded audio
	opus_int16 pcm[samples*2];

	msg::PcmChunk* decodedChunk = new msg::PcmChunk();
	decodedChunk->payloadSize = samples*4;
	decodedChunk->payload = (char*)realloc(decodedChunk->payload, decodedChunk->payloadSize);

	// decode
	int frame_size = opus_decode(dec, (unsigned char*)chunk->payload, chunk->payloadSize, pcm, samples, 0);
	if (frame_size < 0) {
		logE << "Failed to decode chunk: " << frame_size << '\n';
		logE << " IN size:  " << chunk->payloadSize << '\n';
		logE << " OUT size: " << decodedChunk->payloadSize << '\n';
	}
	else {
		// logD << "Decoded chunk: size " << chunk->payloadSize << " bytes, decoded " << frame_size << " bytes" << '\n';

		// copy encoded data to chunk
		chunk->payloadSize = samples*4;
		chunk->payload = (char*)realloc(chunk->payload, chunk->payloadSize);

		// uninterleave audio
		for(int i=0; i<samples*2; i++) {
			chunk->payload[2*i+1] = (char)(pcm[i] >> 8);
			chunk->payload[2*i] = (char)(pcm[i] & 0x00ff);
		}

	}

	return true;
}


bool OpusDecoderWrapper::setHeader(msg::Header* chunk)
{
	return true;
}