Add encoder and decoder for opus audio codec

client/opusDecoder.cpp

@@ -0,0 +1,76 @@
+/***
+	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;
+}