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/****************************************************************************
**
** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the Qt Mobility Components.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: 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.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
/* Audio related snippets */
#include <QFile>
#include <QTimer>
#include <QDebug>
#include "qaudiodeviceinfo.h"
#include "qaudioinput.h"
#include "qaudiooutput.h"
#include "qaudioprobe.h"
#include "qaudiodecoder.h"
class AudioInputExample : public QObject {
Q_OBJECT
public:
void setup();
public Q_SLOTS:
void stopRecording();
void stateChanged(QAudio::State newState);
private:
//! [Audio input class members]
QFile destinationFile; // class member.
QAudioInput* audio; // class member.
//! [Audio input class members]
};
void AudioInputExample::setup()
//! [Audio input setup]
{
destinationFile.setFileName("/tmp/test.raw");
destinationFile.open( QIODevice::WriteOnly | QIODevice::Truncate );
QAudioFormat format;
// set up the format you want, eg.
format.setSampleRate(8000);
format.setChannelCount(1);
format.setSampleSize(8);
format.setCodec("audio/pcm");
format.setByteOrder(QAudioFormat::LittleEndian);
format.setSampleType(QAudioFormat::UnSignedInt);
QAudioDeviceInfo info = QAudioDeviceInfo::defaultInputDevice();
if (!info.isFormatSupported(format)) {
qWarning()<<"default format not supported try to use nearest";
format = info.nearestFormat(format);
}
audio = new QAudioInput(format, this);
connect(audio, SIGNAL(stateChanged(QAudio::State)), this, SLOT(stateChanged(QAudio::State)));
QTimer::singleShot(3000, this, SLOT(stopRecording()));
audio->start(&destinationFile);
// Records audio for 3000ms
}
//! [Audio input setup]
//! [Audio input stop recording]
void AudioInputExample::stopRecording()
{
audio->stop();
destinationFile.close();
delete audio;
}
//! [Audio input stop recording]
//! [Audio input state changed]
void AudioInputExample::stateChanged(QAudio::State newState)
{
switch (newState) {
case QAudio::StoppedState:
if (audio->error() != QAudio::NoError) {
// Error handling
} else {
// Finished recording
}
break;
case QAudio::ActiveState:
// Started recording - read from IO device
break;
default:
// ... other cases as appropriate
break;
}
}
//! [Audio input state changed]
class AudioOutputExample : public QObject {
Q_OBJECT
public:
void setup();
public Q_SLOTS:
void stateChanged(QAudio::State newState);
private:
//! [Audio output class members]
QFile sourceFile; // class member.
QAudioOutput* audio; // class member.
//! [Audio output class members]
};
void AudioOutputExample::setup()
//! [Audio output setup]
{
sourceFile.setFileName("/tmp/test.raw");
sourceFile.open(QIODevice::ReadOnly);
QAudioFormat format;
// Set up the format, eg.
format.setSampleRate(8000);
format.setChannelCount(1);
format.setSampleSize(8);
format.setCodec("audio/pcm");
format.setByteOrder(QAudioFormat::LittleEndian);
format.setSampleType(QAudioFormat::UnSignedInt);
QAudioDeviceInfo info(QAudioDeviceInfo::defaultOutputDevice());
if (!info.isFormatSupported(format)) {
qWarning() << "raw audio format not supported by backend, cannot play audio.";
return;
}
audio = new QAudioOutput(format, this);
connect(audio, SIGNAL(stateChanged(QAudio::State)), this, SLOT(stateChanged(QAudio::State)));
audio->start(&sourceFile);
}
//! [Audio output setup]
//! [Audio output state changed]
void AudioOutputExample::stateChanged(QAudio::State newState)
{
switch (newState) {
case QAudio::IdleState:
// Finished playing (no more data)
audio->stop();
sourceFile.close();
delete audio;
break;
case QAudio::StoppedState:
// Stopped for other reasons
if (audio->error() != QAudio::NoError) {
// Error handling
}
break;
default:
// ... other cases as appropriate
break;
}
}
//! [Audio output state changed]
void AudioDeviceInfo()
{
//! [Setting audio format]
QAudioFormat format;
format.setSampleRate(44100);
// ... other format parameters
format.setSampleType(QAudioFormat::SignedInt);
QAudioDeviceInfo info(QAudioDeviceInfo::defaultOutputDevice());
if (!info.isFormatSupported(format))
format = info.nearestFormat(format);
//! [Setting audio format]
//! [Dumping audio formats]
foreach (const QAudioDeviceInfo &deviceInfo, QAudioDeviceInfo::availableDevices(QAudio::AudioOutput))
qDebug() << "Device name: " << deviceInfo.deviceName();
//! [Dumping audio formats]
}
class AudioDecodingExample : public QObject {
Q_OBJECT
public:
void decode();
public Q_SLOTS:
void stateChanged(QAudio::State newState);
void readBuffer();
};
void AudioDecodingExample::decode()
{
//! [Local audio decoding]
QAudioFormat desiredFormat;
desiredFormat.setChannelCount(2);
desiredFormat.setCodec("audio/x-raw");
desiredFormat.setSampleType(QAudioFormat::UnSignedInt);
desiredFormat.setSampleRate(48000);
desiredFormat.setSampleSize(16);
QAudioDecoder *decoder = new QAudioDecoder(this);
decoder->setAudioFormat(desiredFormat);
decoder->setSourceFilename("level1.mp3");
connect(decoder, SIGNAL(bufferReady()), this, SLOT(readBuffer()));
decoder->start();
// Now wait for bufferReady() signal and call decoder->read()
//! [Local audio decoding]
}
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