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     3 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

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     7 ** This file is part of the QtMultimedia module of the Qt Toolkit.

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    40 ****************************************************************************/

    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 & kLinearPCMFormatFlagIsBigEndian != 0 ? QAudioFormat::BigEndian : QAudioFormat::LittleEndian);

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

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

    74         type = QAudioFormat::SignedInt;

    75     else if ((sf.mFormatFlags & kLinearPCMFormatFlagIsFloat) != 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     return sf;

   103 }

   104 

   105 // QAudioRingBuffer

   106 QAudioRingBuffer::QAudioRingBuffer(int bufferSize):

   107     m_bufferSize(bufferSize)

   108 {

   109     m_buffer = new char[m_bufferSize];

   110     reset();

   111 }

   112 

   113 QAudioRingBuffer::~QAudioRingBuffer()

   114 {

   115     delete m_buffer;

   116 }

   117 

   118 int QAudioRingBuffer::used() const

   119 {

   120     return m_bufferUsed;

   121 }

   122 

   123 int QAudioRingBuffer::free() const

   124 {

   125     return m_bufferSize - m_bufferUsed;

   126 }

   127 

   128 int QAudioRingBuffer::size() const

   129 {

   130     return m_bufferSize;

   131 }

   132 

   133 void QAudioRingBuffer::reset()

   134 {

   135     m_readPos = 0;

   136     m_writePos = 0;

   137     m_bufferUsed = 0;

   138 }

   139 

   140 QT_END_NAMESPACE

   141 

   142