overte-JulianGro/assignment-client/src/audio/AvatarAudioStream.cpp

//
//  AvatarAudioStream.cpp
//  assignment-client/src/audio
//
//  Created by Stephen Birarda on 6/5/13.
//  Copyright 2013 High Fidelity, Inc.
//
//  Distributed under the Apache License, Version 2.0.
//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
//

#include <PacketHeaders.h>

#include "AvatarAudioStream.h"

AvatarAudioStream::AvatarAudioStream(bool isStereo, const InboundAudioStream::Settings& settings) :
    PositionalAudioStream(PositionalAudioStream::Microphone, isStereo, settings),
    _lastMuted(usecTimestampNow())
{
}

int AvatarAudioStream::parseStreamProperties(PacketType type, const QByteArray& packetAfterSeqNum, int& numAudioSamples) {
    int readBytes = 0;

    if (type == PacketTypeSilentAudioFrame) {
        const char* dataAt = packetAfterSeqNum.constData();
        quint16 numSilentSamples = *(reinterpret_cast<const quint16*>(dataAt));
        readBytes += sizeof(quint16);
        numAudioSamples = (int)numSilentSamples;

        // read the positional data
        readBytes += parsePositionalData(packetAfterSeqNum.mid(readBytes));

    } else {
        _shouldLoopbackForNode = (type == PacketTypeMicrophoneAudioWithEcho);

        // read the channel flag
        quint8 channelFlag = packetAfterSeqNum.at(readBytes);
        bool isStereo = channelFlag == 1;
        readBytes += sizeof(quint8);

        // if isStereo value has changed, restart the ring buffer with new frame size
        if (isStereo != _isStereo) {
            _ringBuffer.resizeForFrameSize(isStereo ? NETWORK_BUFFER_LENGTH_SAMPLES_STEREO : NETWORK_BUFFER_LENGTH_SAMPLES_PER_CHANNEL);
            _isStereo = isStereo;
        }

        // read the positional data
        readBytes += parsePositionalData(packetAfterSeqNum.mid(readBytes));

        // calculate how many samples are in this packet
        int numAudioBytes = packetAfterSeqNum.size() - readBytes;
        numAudioSamples = numAudioBytes / sizeof(int16_t);
    }
    
    return readBytes;
}