Initial copy of QtMultimediaKit.

Comes from original repo, with SHA1:
2c82d5611655e5967f5c5095af50c0991c4378b2

doc/src/snippets/multimedia-snippets/audio.cpp

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+/****************************************************************************
+**
+** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the Qt Mobility Components.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** 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, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+/* Audio related snippets */
+#include <QFile>
+#include <QTimer>
+#include <QDebug>
+
+#include "qaudiodeviceinfo.h"
+#include "qaudioinput.h"
+#include "qaudiooutput.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.setFrequency(8000);
+    format.setChannels(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;
+
+        // ...
+    }
+}
+//! [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.setFrequency(8000);
+    format.setChannels(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;
+
+            // ...
+    }
+}
+//! [Audio output state changed]
+
+void AudioDeviceInfo()
+{
+    //! [Setting audio format]
+    QAudioFormat format;
+    format.setFrequency(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]
+}