Mac-4.7.4/src/multimedia/audio/qaudio_mac.cpp

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** Contact: Nokia Corporation (qt-info@nokia.com)
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#include "qaudio_mac_p.h"

QT_BEGIN_NAMESPACE

// Debugging
QDebug operator<<(QDebug dbg, const QAudioFormat& audioFormat)
{
    dbg.nospace() << "QAudioFormat(" <<
            audioFormat.frequency() << "," <<
            audioFormat.channels() << "," <<
            audioFormat.sampleSize()<< "," <<
            audioFormat.codec() << "," <<
            audioFormat.byteOrder() << "," <<
            audioFormat.sampleType() << ")";

    return dbg.space();
}


// Conversion
QAudioFormat toQAudioFormat(AudioStreamBasicDescription const& sf)
{
    QAudioFormat    audioFormat;

    audioFormat.setFrequency(sf.mSampleRate);
    audioFormat.setChannels(sf.mChannelsPerFrame);
    audioFormat.setSampleSize(sf.mBitsPerChannel);
    audioFormat.setCodec(QString::fromLatin1("audio/pcm"));
    audioFormat.setByteOrder((sf.mFormatFlags & kAudioFormatFlagIsBigEndian) != 0 ? QAudioFormat::BigEndian : QAudioFormat::LittleEndian);
    QAudioFormat::SampleType type = QAudioFormat::UnSignedInt;
    if ((sf.mFormatFlags & kAudioFormatFlagIsSignedInteger) != 0)
        type = QAudioFormat::SignedInt;
    else if ((sf.mFormatFlags & kAudioFormatFlagIsFloat) != 0)
        type = QAudioFormat::Float;
    audioFormat.setSampleType(type);

    return audioFormat;
}

AudioStreamBasicDescription toAudioStreamBasicDescription(QAudioFormat const& audioFormat)
{
    AudioStreamBasicDescription sf;

    sf.mFormatFlags         = kAudioFormatFlagIsPacked;
    sf.mSampleRate          = audioFormat.frequency();
    sf.mFramesPerPacket     = 1;
    sf.mChannelsPerFrame    = audioFormat.channels();
    sf.mBitsPerChannel      = audioFormat.sampleSize();
    sf.mBytesPerFrame       = sf.mChannelsPerFrame * (sf.mBitsPerChannel / 8);
    sf.mBytesPerPacket      = sf.mFramesPerPacket * sf.mBytesPerFrame;
    sf.mFormatID            = kAudioFormatLinearPCM;

    switch (audioFormat.sampleType()) {
    case QAudioFormat::SignedInt: sf.mFormatFlags |= kAudioFormatFlagIsSignedInteger; break;
    case QAudioFormat::UnSignedInt: /* default */ break;
    case QAudioFormat::Float: sf.mFormatFlags |= kAudioFormatFlagIsFloat; break;
    case QAudioFormat::Unknown:  default: break;
    }

    if (audioFormat.byteOrder() == QAudioFormat::BigEndian)
        sf.mFormatFlags |= kAudioFormatFlagIsBigEndian;

    return sf;
}

// QAudioRingBuffer
QAudioRingBuffer::QAudioRingBuffer(int bufferSize):
    m_bufferSize(bufferSize)
{
    m_buffer = new char[m_bufferSize];
    reset();
}

QAudioRingBuffer::~QAudioRingBuffer()
{
    delete m_buffer;
}

int QAudioRingBuffer::used() const
{
    return m_bufferUsed;
}

int QAudioRingBuffer::free() const
{
    return m_bufferSize - m_bufferUsed;
}

int QAudioRingBuffer::size() const
{
    return m_bufferSize;
}

void QAudioRingBuffer::reset()
{
    m_readPos = 0;
    m_writePos = 0;
    m_bufferUsed = 0;
}

QT_END_NAMESPACE