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Add encoder and decoder for opus audio codec

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This commit is contained in:
Hannes Ellinger 2015-06-14 11:35:41 +02:00
parent 21a9aa3e32
commit 4fda33a20e
8 changed files with 228 additions and 17 deletions
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server/opusEncoder.cpp Normal file
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/***
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 "opusEncoder.h"
#include "common/log.h"
OpusEncoderWrapper::OpusEncoderWrapper(const msg::SampleFormat& format) : Encoder(format)
{
int error;
headerChunk = new msg::Header("opus");
enc = opus_encoder_create(format.rate, format.channels, OPUS_APPLICATION_RESTRICTED_LOWDELAY, &error);
if(error != 0) {
logE << "Failed to initialize opus encoder: " << error << '\n';
logE << " Rate: " << format.rate << '\n';
logE << " Channels: " << format.channels << '\n';
}
}
double OpusEncoderWrapper::encode(msg::PcmChunk* chunk)
{
int samples = chunk->payloadSize/4;
opus_int16 pcm[samples*2];
unsigned char encoded[chunk->payloadSize];
// get 16 bit samples
for(int i=0; i<samples*2; i++)
{
pcm[i] = (opus_int16)(((opus_int16)chunk->payload[2*i+1] << 8) | (0x00ff & (opus_int16)chunk->payload[2*i]));
}
// encode
int len = opus_encode(enc, pcm, samples, encoded, chunk->payloadSize);
// logD << "Encoded: size " << chunk->payloadSize << " bytes, encoded: " << len << " bytes" << '\n';
if(len>0) {
// copy encoded data to chunk
chunk->payloadSize = len;
chunk->payload = (char*)realloc(chunk->payload, chunk->payloadSize);
memcpy(chunk->payload, encoded, len);
}
else {
logE << "Failed to encode chunk: " << len << '\n';
logE << " Frame size: " << samples/2 << '\n';
logE << " Max bytes: " << chunk->payloadSize << '\n';
}
// return chunk duration
return (double)samples / ((double)sampleFormat.rate / 1000.);
}