/*  This file is part of the KDE project.

Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

This library is free software: you can redistribute it and/or modify

it under the terms of the GNU Lesser General Public License as published by

the Free Software Foundation, either version 2.1 or 3 of the License.

This library is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License

along with this library.  If not, see <http://www.gnu.org/licenses/>.

*/

#include "audioequalizer.h"

QT_BEGIN_NAMESPACE

using namespace Phonon;

using namespace Phonon::MMF;

/*! \class MMF::AudioEqualizer

  \internal

*/

// Define functions which depend on concrete native effect class name

PHONON_MMF_DEFINE_EFFECT_FUNCTIONS(AudioEqualizer)

AudioEqualizer::AudioEqualizer(QObject *parent, const QList<EffectParameter>& parameters)

    :   AbstractAudioEffect::AbstractAudioEffect(parent, parameters)

{

}

int AudioEqualizer::effectParameterChanged(const EffectParameter &param,

                                      const QVariant &value)

{

    const int band = param.id() - ParameterBase + 1;

    const qreal externalLevel = value.toReal();

    const int internalLevel = param.toInternalValue(externalLevel);

    TRAPD(err, concreteEffect()->SetBandLevelL(band, internalLevel));

    return err;

}

//-----------------------------------------------------------------------------

// Static functions

//-----------------------------------------------------------------------------

const char* AudioEqualizer::description()

{

    return "Audio equalizer";

}

bool AudioEqualizer::getParameters(CMdaAudioOutputStream *stream,

    QList<EffectParameter>& parameters)

{

    bool supported = false;

    QScopedPointer<CAudioEqualizer> effect;

    TRAPD(err, effect.reset(CAudioEqualizer::NewL(*stream)));

    if (KErrNone == err) {

        supported = true;

        TInt32 dbMin;

        TInt32 dbMax;

        effect->DbLevelLimits(dbMin, dbMax);

        const int bandCount = effect->NumberOfBands();

        for (int i = 0; i < bandCount; ++i) {

            // For some reason, band IDs are 1-based, as opposed to the

            // 0-based indices used in just about other Symbian API...!

            const int band = i + 1;

            const qint32 hz = effect->CenterFrequency(band);

            // We pass a floating-point parameter range of -1.0 to +1.0 for

            // each band in order to work around a limitation in

            // Phonon::EffectWidget.  See documentation of EffectParameter

            // for more details.

            EffectParameter param(

                 /* parameterId */        ParameterBase + i,

                 /* name */               tr("%1 Hz").arg(hz),

                 /* hints */              EffectParameter::LogarithmicHint,

                 /* defaultValue */       QVariant(qreal(0.0)),

                 /* minimumValue */       QVariant(qreal(-1.0)),

                 /* maximumValue */       QVariant(qreal(+1.0)));

            param.setInternalRange(dbMin, dbMax);

            parameters.append(param);

        }

    }

    return supported;

}

QT_END_NAMESPACE