qtmobility/plugins/multimedia/pulseaudio/wavedecoder.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Fri, 16 Apr 2010 15:51:22 +0300
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/****************************************************************************
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**
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** Copyright (C) 2009 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 "wavedecoder.h"
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#include <QtCore/qtimer.h>
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#include <QtCore/qendian.h>
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#include <QDebug>
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WaveDecoder::WaveDecoder(QIODevice *s, QObject *parent):
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    QIODevice(parent),
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    haveFormat(false),
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    dataSize(0),
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    remaining(0),
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    source(s)
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{
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    open(QIODevice::ReadOnly | QIODevice::Unbuffered);
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    if (source->bytesAvailable() >= sizeof(CombinedHeader))
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        QTimer::singleShot(0, this, SLOT(handleData()));
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    else
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        connect(source, SIGNAL(readyRead()), SLOT(handleData()));
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}
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WaveDecoder::~WaveDecoder()
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{
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}
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QAudioFormat WaveDecoder::audioFormat() const
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{
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    return format;
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}
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int WaveDecoder::duration() const
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{
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    return size() * 1000 / (format.sampleSize() / 8) / format.channels() / format.frequency();
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}
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qint64 WaveDecoder::size() const
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{
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    return haveFormat ? dataSize : 0;
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}
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bool WaveDecoder::isSequential() const
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{
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    return source->isSequential();
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}
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qint64 WaveDecoder::bytesAvailable() const
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{
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    return haveFormat ? source->bytesAvailable() : 0;
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}
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qint64 WaveDecoder::readData(char *data, qint64 maxlen)
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{
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    return haveFormat ? source->read(data, maxlen) : 0;
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}
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qint64 WaveDecoder::writeData(const char *data, qint64 len)
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{
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    Q_UNUSED(data);
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    Q_UNUSED(len);
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    return -1;
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}
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void WaveDecoder::handleData()
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{
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    if (source->bytesAvailable() < sizeof(CombinedHeader))
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        return;
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    source->disconnect(SIGNAL(readyRead()), this, SLOT(handleData()));
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    source->read((char*)&header, sizeof(CombinedHeader));
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
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   112
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parents:
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   113
    if (qstrncmp(header.riff.descriptor.id, "RIFF", 4) != 0 ||
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   114
        qstrncmp(header.riff.type, "WAVE", 4) != 0 ||
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
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   115
        qstrncmp(header.wave.descriptor.id, "fmt ", 4) != 0 ||
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parents:
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   116
        (header.wave.audioFormat != 0 && header.wave.audioFormat != 1) ||
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parents:
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   117
        qstrncmp(header.data.descriptor.id, "data", 4) != 0) {
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parents:
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   118
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   119
        emit invalidFormat();
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parents:
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   120
    }
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parents:
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   121
    else {
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parents:
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   122
        int bps = qFromLittleEndian<quint16>(header.wave.bitsPerSample);
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   123
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parents:
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   124
        format.setCodec("audio/pcm");
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parents:
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   125
        format.setSampleType(bps == 8 ? QAudioFormat::UnSignedInt : QAudioFormat::SignedInt);
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parents:
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   126
        format.setByteOrder(QAudioFormat::LittleEndian);
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parents:
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   127
        format.setFrequency(qFromLittleEndian<quint32>(header.wave.sampleRate));
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parents:
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   128
        format.setSampleSize(bps);
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
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   129
        format.setChannels(qFromLittleEndian<quint16>(header.wave.numChannels));
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   130
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parents:
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   131
        dataSize = qFromLittleEndian<quint32>(header.data.descriptor.size);
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   132
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
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   133
        haveFormat = true;
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parents:
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   134
        connect(source, SIGNAL(readyRead()), SIGNAL(readyRead()));
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
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   135
        emit formatKnown();
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parents:
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   136
    }
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parents:
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   137
}