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    41 

    42 

    43 #include "qaudio_mac_p.h"

    44 

    45 QT_BEGIN_NAMESPACE

    46 

    47 // Debugging

    48 QDebug operator<<(QDebug dbg, const QAudioFormat& audioFormat)

    49 {

    50     dbg.nospace() << "QAudioFormat(" <<

    51             audioFormat.frequency() << "," <<

    52             audioFormat.channels() << "," <<

    53             audioFormat.sampleSize()<< "," <<

    54             audioFormat.codec() << "," <<

    55             audioFormat.byteOrder() << "," <<

    56             audioFormat.sampleType() << ")";

    57 

    58     return dbg.space();

    59 }

    60 

    61 

    62 // Conversion

    63 QAudioFormat toQAudioFormat(AudioStreamBasicDescription const& sf)

    64 {

    65     QAudioFormat    audioFormat;

    66 

    67     audioFormat.setFrequency(sf.mSampleRate);

    68     audioFormat.setChannels(sf.mChannelsPerFrame);

    69     audioFormat.setSampleSize(sf.mBitsPerChannel);

    70     audioFormat.setCodec(QString::fromLatin1("audio/pcm"));

    71     audioFormat.setByteOrder((sf.mFormatFlags & kAudioFormatFlagIsBigEndian) != 0 ? QAudioFormat::BigEndian : QAudioFormat::LittleEndian);

    72     QAudioFormat::SampleType type = QAudioFormat::UnSignedInt;

    73     if ((sf.mFormatFlags & kAudioFormatFlagIsSignedInteger) != 0)

    74         type = QAudioFormat::SignedInt;

    75     else if ((sf.mFormatFlags & kAudioFormatFlagIsFloat) != 0)

    76         type = QAudioFormat::Float;

    77     audioFormat.setSampleType(type);

    78 

    79     return audioFormat;

    80 }

    81 

    82 AudioStreamBasicDescription toAudioStreamBasicDescription(QAudioFormat const& audioFormat)

    83 {

    84     AudioStreamBasicDescription sf;

    85 

    86     sf.mFormatFlags         = kAudioFormatFlagIsPacked;

    87     sf.mSampleRate          = audioFormat.frequency();

    88     sf.mFramesPerPacket     = 1;

    89     sf.mChannelsPerFrame    = audioFormat.channels();

    90     sf.mBitsPerChannel      = audioFormat.sampleSize();

    91     sf.mBytesPerFrame       = sf.mChannelsPerFrame * (sf.mBitsPerChannel / 8);

    92     sf.mBytesPerPacket      = sf.mFramesPerPacket * sf.mBytesPerFrame;

    93     sf.mFormatID            = kAudioFormatLinearPCM;

    94 

    95     switch (audioFormat.sampleType()) {

    96     case QAudioFormat::SignedInt: sf.mFormatFlags |= kAudioFormatFlagIsSignedInteger; break;

    97     case QAudioFormat::UnSignedInt: /* default */ break;

    98     case QAudioFormat::Float: sf.mFormatFlags |= kAudioFormatFlagIsFloat; break;

    99     case QAudioFormat::Unknown:  default: break;

   100     }

   101 

   102     if (audioFormat.byteOrder() == QAudioFormat::BigEndian)

   103         sf.mFormatFlags |= kAudioFormatFlagIsBigEndian;

   104 

   105     return sf;

   106 }

   107 

   108 // QAudioRingBuffer

   109 QAudioRingBuffer::QAudioRingBuffer(int bufferSize):

   110     m_bufferSize(bufferSize)

   111 {

   112     m_buffer = new char[m_bufferSize];

   113     reset();

   114 }

   115 

   116 QAudioRingBuffer::~QAudioRingBuffer()

   117 {

   118     delete m_buffer;

   119 }

   120 

   121 int QAudioRingBuffer::used() const

   122 {

   123     return m_bufferUsed;

   124 }

   125 

   126 int QAudioRingBuffer::free() const

   127 {

   128     return m_bufferSize - m_bufferUsed;

   129 }

   130 

   131 int QAudioRingBuffer::size() const

   132 {

   133     return m_bufferSize;

   134 }

   135 

   136 void QAudioRingBuffer::reset()

   137 {

   138     m_readPos = 0;

   139     m_writePos = 0;

   140     m_bufferUsed = 0;

   141 }

   142 

   143 QT_END_NAMESPACE

   144 

   145