CoreAudio: Create an audio plugin supporting iOS and OS X
This removes the Mac audio backend that was hardcoded into QtMultimedia and adds a new audio plugin using the CoreAudio API. Change-Id: Ib15291825f9452a3763e0eeb281d952deb0bad3d Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@digia.com> Reviewed-by: Christian Stromme <christian.stromme@digia.com> Reviewed-by: Yoann Lopes <yoann.lopes@digia.com>
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Andy Nichols
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The Qt Project
The Qt Project
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src/plugins/coreaudio/coreaudioutils.mm
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src/plugins/coreaudio/coreaudioutils.mm
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/****************************************************************************
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**
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** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
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** Contact: http://www.qt-project.org/legal
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**
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** This file is part of the plugins of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and Digia. For licensing terms and
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** conditions see http://qt.digia.com/licensing. For further information
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** use the contact form at http://qt.digia.com/contact-us.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Digia gives you certain additional
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** rights. These rights are described in the Digia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3.0 as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU General Public License version 3.0 requirements will be
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** met: http://www.gnu.org/copyleft/gpl.html.
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**
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "coreaudioutils.h"
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#include <mach/mach_time.h>
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QT_BEGIN_NAMESPACE
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double CoreAudioUtils::sFrequency = 0.0;
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bool CoreAudioUtils::sIsInitialized = false;
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void CoreAudioUtils::initialize()
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{
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struct mach_timebase_info timeBaseInfo;
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mach_timebase_info(&timeBaseInfo);
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sFrequency = static_cast<double>(timeBaseInfo.denom) / static_cast<double>(timeBaseInfo.numer);
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sFrequency *= 1000000000.0;
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sIsInitialized = true;
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}
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quint64 CoreAudioUtils::currentTime()
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{
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return mach_absolute_time();
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}
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double CoreAudioUtils::frequency()
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{
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if (!sIsInitialized)
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initialize();
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return sFrequency;
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}
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QAudioFormat CoreAudioUtils::toQAudioFormat(AudioStreamBasicDescription const& sf)
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{
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QAudioFormat audioFormat;
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audioFormat.setSampleRate(sf.mSampleRate);
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audioFormat.setChannelCount(sf.mChannelsPerFrame);
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audioFormat.setSampleSize(sf.mBitsPerChannel);
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audioFormat.setCodec(QString::fromLatin1("audio/pcm"));
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audioFormat.setByteOrder((sf.mFormatFlags & kAudioFormatFlagIsBigEndian) != 0 ? QAudioFormat::BigEndian : QAudioFormat::LittleEndian);
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QAudioFormat::SampleType type = QAudioFormat::UnSignedInt;
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if ((sf.mFormatFlags & kAudioFormatFlagIsSignedInteger) != 0)
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type = QAudioFormat::SignedInt;
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else if ((sf.mFormatFlags & kAudioFormatFlagIsFloat) != 0)
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type = QAudioFormat::Float;
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audioFormat.setSampleType(type);
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return audioFormat;
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}
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AudioStreamBasicDescription CoreAudioUtils::toAudioStreamBasicDescription(QAudioFormat const& audioFormat)
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{
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AudioStreamBasicDescription sf;
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sf.mFormatFlags = kAudioFormatFlagIsPacked;
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sf.mSampleRate = audioFormat.sampleRate();
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sf.mFramesPerPacket = 1;
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sf.mChannelsPerFrame = audioFormat.channelCount();
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sf.mBitsPerChannel = audioFormat.sampleSize();
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sf.mBytesPerFrame = sf.mChannelsPerFrame * (sf.mBitsPerChannel / 8);
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sf.mBytesPerPacket = sf.mFramesPerPacket * sf.mBytesPerFrame;
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sf.mFormatID = kAudioFormatLinearPCM;
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switch (audioFormat.sampleType()) {
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case QAudioFormat::SignedInt: sf.mFormatFlags |= kAudioFormatFlagIsSignedInteger; break;
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case QAudioFormat::UnSignedInt: /* default */ break;
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case QAudioFormat::Float: sf.mFormatFlags |= kAudioFormatFlagIsFloat; break;
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case QAudioFormat::Unknown: default: break;
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}
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if (audioFormat.byteOrder() == QAudioFormat::BigEndian)
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sf.mFormatFlags |= kAudioFormatFlagIsBigEndian;
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return sf;
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}
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// QAudioRingBuffer
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CoreAudioRingBuffer::CoreAudioRingBuffer(int bufferSize):
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m_bufferSize(bufferSize)
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{
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m_buffer = new char[m_bufferSize];
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reset();
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}
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CoreAudioRingBuffer::~CoreAudioRingBuffer()
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{
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delete m_buffer;
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}
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CoreAudioRingBuffer::Region CoreAudioRingBuffer::acquireReadRegion(int size)
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{
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const int used = m_bufferUsed.fetchAndAddAcquire(0);
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if (used > 0) {
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const int readSize = qMin(size, qMin(m_bufferSize - m_readPos, used));
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return readSize > 0 ? Region(m_buffer + m_readPos, readSize) : Region(0, 0);
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}
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return Region(0, 0);
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}
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void CoreAudioRingBuffer::releaseReadRegion(const CoreAudioRingBuffer::Region ®ion)
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{
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m_readPos = (m_readPos + region.second) % m_bufferSize;
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m_bufferUsed.fetchAndAddRelease(-region.second);
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}
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CoreAudioRingBuffer::Region CoreAudioRingBuffer::acquireWriteRegion(int size)
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{
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const int free = m_bufferSize - m_bufferUsed.fetchAndAddAcquire(0);
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Region output;
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if (free > 0) {
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const int writeSize = qMin(size, qMin(m_bufferSize - m_writePos, free));
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output = writeSize > 0 ? Region(m_buffer + m_writePos, writeSize) : Region(0, 0);
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} else {
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output = Region(0, 0);
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}
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#ifdef QT_DEBUG_COREAUDIO
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qDebug("acquireWriteRegion(%d) free: %d returning Region(%p, %d)", size, free, output.first, output.second);
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#endif
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return output;
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}
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void CoreAudioRingBuffer::releaseWriteRegion(const CoreAudioRingBuffer::Region ®ion)
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{
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m_writePos = (m_writePos + region.second) % m_bufferSize;
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m_bufferUsed.fetchAndAddRelease(region.second);
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#ifdef QT_DEBUG_COREAUDIO
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qDebug("releaseWriteRegion(%p,%d): m_writePos:%d", region.first, region.second, m_writePos);
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#endif
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}
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int CoreAudioRingBuffer::used() const
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{
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return m_bufferUsed.load();
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}
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int CoreAudioRingBuffer::free() const
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{
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return m_bufferSize - m_bufferUsed.load();
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}
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int CoreAudioRingBuffer::size() const
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{
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return m_bufferSize;
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}
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void CoreAudioRingBuffer::reset()
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{
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m_readPos = 0;
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m_writePos = 0;
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m_bufferUsed.store(0);
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}
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QT_END_NAMESPACE
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