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Christian Strømme authored
We where very strict about tearing down the audio device. While this is a good strategy to avoid unnecessary resource usage, it also causes excessive re-allocations, e.g., when transiting from start to stop and back again. This can increase latency, especially in case where a short clip is re-played at a high frequency. This change also decrease the chance of the player ending up in some unknown state where it drops audio clips without any warning. Task-number: QTBUG-40864 Change-Id: I1afad4af0622983f0f0c221d91cf794585d8cad2 Reviewed-by:Yoann Lopes <yoann.lopes@digia.com>
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qopenslesaudiooutput.h 4.77 KiB
/******************************************************************************** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).** Contact: http://www.qt-project.org/legal**** This file is part of the Qt Toolkit.**** $QT_BEGIN_LICENSE:LGPL21$** Commercial License Usage** Licensees holding valid commercial Qt licenses may use this file in** accordance with the commercial license agreement provided with the** Software or, alternatively, in accordance with the terms contained in** a written agreement between you and Digia. For licensing terms and** conditions see http://qt.digia.com/licensing. For further information** use the contact form at http://qt.digia.com/contact-us.**** GNU Lesser General Public License Usage** Alternatively, this file may be used under the terms of the GNU Lesser** General Public License version 2.1 or version 3 as published by the Free** Software Foundation and appearing in the file LICENSE.LGPLv21 and** LICENSE.LGPLv3 included in the packaging of this file. Please review the** following information to ensure the GNU Lesser General Public License** requirements will be met: https://www.gnu.org/licenses/lgpl.html and** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.**** In addition, as a special exception, Digia gives you certain additional** rights. These rights are described in the Digia Qt LGPL Exception** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.**** $QT_END_LICENSE$******************************************************************************/#ifndef QOPENSLESAUDIOOUTPUT_H#define QOPENSLESAUDIOOUTPUT_H#include <qaudiosystem.h>#include <SLES/OpenSLES.h>#include <qbytearray.h>#include <qmap.h>#include <QTime>QT_BEGIN_NAMESPACEclass QOpenSLESAudioOutput : public QAbstractAudioOutput{ Q_OBJECTpublic: QOpenSLESAudioOutput(const QByteArray &device); ~QOpenSLESAudioOutput(); void start(QIODevice *device) Q_DECL_OVERRIDE; QIODevice *start() Q_DECL_OVERRIDE; void stop() Q_DECL_OVERRIDE; void reset() Q_DECL_OVERRIDE; void suspend() Q_DECL_OVERRIDE; void resume() Q_DECL_OVERRIDE; int bytesFree() const Q_DECL_OVERRIDE; int periodSize() const Q_DECL_OVERRIDE; void setBufferSize(int value) Q_DECL_OVERRIDE; int bufferSize() const Q_DECL_OVERRIDE; void setNotifyInterval(int milliSeconds) Q_DECL_OVERRIDE; int notifyInterval() const Q_DECL_OVERRIDE; qint64 processedUSecs() const Q_DECL_OVERRIDE; qint64 elapsedUSecs() const Q_DECL_OVERRIDE; QAudio::Error error() const Q_DECL_OVERRIDE; QAudio::State state() const Q_DECL_OVERRIDE; void setFormat(const QAudioFormat &format) Q_DECL_OVERRIDE; QAudioFormat format() const Q_DECL_OVERRIDE;7172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140
void setVolume(qreal volume) Q_DECL_OVERRIDE;
qreal volume() const Q_DECL_OVERRIDE;
void setCategory(const QString &category) Q_DECL_OVERRIDE;
QString category() const Q_DECL_OVERRIDE;
private:
friend class SLIODevicePrivate;
Q_INVOKABLE void onEOSEvent();
void bufferAvailable(quint32 count, quint32 playIndex);
static void playCallback(SLPlayItf playItf, void *ctx, SLuint32 event);
static void bufferQueueCallback(SLBufferQueueItf bufferQueue, void *ctx);
bool preparePlayer();
void destroyPlayer();
void stopPlayer();
void startPlayer();
qint64 writeData(const char *data, qint64 len);
void setState(QAudio::State state);
void setError(QAudio::Error error);
SLmillibel adjustVolume(qreal vol);
QByteArray m_deviceName;
QAudio::State m_state;
QAudio::Error m_error;
SLObjectItf m_outputMixObject;
SLObjectItf m_playerObject;
SLPlayItf m_playItf;
SLVolumeItf m_volumeItf;
SLBufferQueueItf m_bufferQueueItf;
QIODevice *m_audioSource;
char *m_buffers;
qreal m_volume;
bool m_pullMode;
int m_nextBuffer;
int m_bufferSize;
int m_notifyInterval;
int m_periodSize;
qint64 m_elapsedTime;
qint64 m_processedBytes;
QAtomicInt m_availableBuffers;
SLuint32 m_eventMask;
bool m_startRequiresInit;
qint32 m_streamType;
QTime m_clockStamp;
QAudioFormat m_format;
QString m_category;
static QMap<QString, qint32> m_categories;
};
class SLIODevicePrivate : public QIODevice
{
Q_OBJECT
public:
inline SLIODevicePrivate(QOpenSLESAudioOutput *audio) : m_audioDevice(audio) {}
inline ~SLIODevicePrivate() Q_DECL_OVERRIDE {}
protected:
inline qint64 readData(char *, qint64) Q_DECL_OVERRIDE { return 0; }
inline qint64 writeData(const char *data, qint64 len) Q_DECL_OVERRIDE;
private:
QOpenSLESAudioOutput *m_audioDevice;
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};
qint64 SLIODevicePrivate::writeData(const char *data, qint64 len)
{
Q_ASSERT(m_audioDevice);
return m_audioDevice->writeData(data, len);
}
QT_END_NAMESPACE
#endif // QOPENSLESAUDIOOUTPUT_H