qtmobility/plugins/multimedia/audiocapture/audioencodercontrol.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 06 Jul 2010 15:12:50 +0300
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permissions -rw-r--r--
Revision: 201025 Kit: 2010127
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/****************************************************************************
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**
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** This file is part of the Qt Mobility Components.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** No Commercial Usage
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** This file contains pre-release code and may not be distributed.
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** You may use this file in accordance with the terms and conditions
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** contained in the Technology Preview License Agreement accompanying
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** this package.
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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, Nokia gives you certain additional
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** rights.  These rights are described in the Nokia 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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** If you have questions regarding the use of this file, please contact
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** Nokia at qt-info@nokia.com.
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**
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**
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**
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**
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**
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**
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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 "audioencodercontrol.h"
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#include "audiocapturesession.h"
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#include <qaudioformat.h>
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#include <QtCore/qdebug.h>
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AudioEncoderControl::AudioEncoderControl(QObject *parent)
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    :QAudioEncoderControl(parent)
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{
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    m_session = qobject_cast<AudioCaptureSession*>(parent);
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    QT_PREPEND_NAMESPACE(QAudioFormat) fmt;
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    fmt.setSampleSize(8);
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    fmt.setChannels(1);
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    fmt.setFrequency(8000);
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    fmt.setSampleType(QT_PREPEND_NAMESPACE(QAudioFormat)::SignedInt);
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    fmt.setCodec("audio/pcm");
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    fmt.setByteOrder(QAudioFormat::LittleEndian);
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    m_session->setFormat(fmt);
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    m_settings.setEncodingMode(QtMultimediaKit::ConstantQualityEncoding);
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    m_settings.setCodec("audio/pcm");
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    m_settings.setBitRate(8000);
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    m_settings.setChannelCount(1);
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    m_settings.setSampleRate(8000);
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    m_settings.setQuality(QtMultimediaKit::LowQuality);
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}
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AudioEncoderControl::~AudioEncoderControl()
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{
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}
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QStringList AudioEncoderControl::supportedAudioCodecs() const
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{
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    QStringList list;
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    if (m_session->supportedContainers().size() > 0)
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        list.append("audio/pcm");
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    return list;
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}
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QString AudioEncoderControl::codecDescription(const QString &codecName) const
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{
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    if (codecName.contains(QLatin1String("audio/pcm")))
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        return QString(tr("PCM audio data"));
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    return QString();
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}
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QStringList AudioEncoderControl::supportedEncodingOptions(const QString &codec) const
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{
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    Q_UNUSED(codec)
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    QStringList list;
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    return list;
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}
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QVariant AudioEncoderControl::encodingOption(const QString &codec, const QString &name) const
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{
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    Q_UNUSED(codec)
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    Q_UNUSED(name)
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    return QVariant();
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}
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void AudioEncoderControl::setEncodingOption(
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        const QString &codec, const QString &name, const QVariant &value)
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{
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    Q_UNUSED(value)
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    Q_UNUSED(codec)
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    Q_UNUSED(name)
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}
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QList<int> AudioEncoderControl::supportedSampleRates(const QAudioEncoderSettings &, bool *continuous) const
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{
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    if (continuous)
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        *continuous = false;
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    return m_session->deviceInfo()->supportedFrequencies();
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}
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QAudioEncoderSettings AudioEncoderControl::audioSettings() const
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{
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    return m_settings;
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}
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void AudioEncoderControl::setAudioSettings(const QAudioEncoderSettings &settings)
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{
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    QAudioFormat fmt = m_session->format();
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15
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    if (settings.encodingMode() == QtMultimediaKit::ConstantQualityEncoding) {
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        if (settings.quality() == QtMultimediaKit::LowQuality) {
1
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            fmt.setSampleSize(8);
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            fmt.setChannels(1);
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            fmt.setFrequency(8000);
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            fmt.setSampleType(QAudioFormat::UnSignedInt);
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        } else if (settings.quality() == QtMultimediaKit::NormalQuality) {
1
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            fmt.setSampleSize(16);
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            fmt.setChannels(1);
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            fmt.setFrequency(22050);
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            fmt.setSampleType(QAudioFormat::SignedInt);
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        } else {
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            fmt.setSampleSize(16);
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            fmt.setChannels(1);
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            fmt.setFrequency(44100);
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            fmt.setSampleType(QAudioFormat::SignedInt);
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        }
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    } else {
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        fmt.setChannels(settings.channelCount());
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        fmt.setFrequency(settings.sampleRate());
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        if (settings.sampleRate() == 8000 && settings.bitRate() == 8000) {
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            fmt.setSampleType(QAudioFormat::UnSignedInt);
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            fmt.setSampleSize(8);
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        } else {
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            fmt.setSampleSize(16);
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            fmt.setSampleType(QAudioFormat::SignedInt);
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        }
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    }
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    fmt.setCodec("audio/pcm");
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    m_session->setFormat(fmt);
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    m_settings = settings;
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}