1 /*  This file is part of the KDE project.

     2 

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

     4 

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

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

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

     8 

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

    10 but WITHOUT ANY WARRANTY; without even the implied warranty of

    11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    12 GNU Lesser General Public License for more details.

    13 

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

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

    16 

    17 */

    18 

    19 #include "audioequalizer.h"

    20 

    21 QT_BEGIN_NAMESPACE

    22 

    23 using namespace Phonon;

    24 using namespace Phonon::MMF;

    25 

    26 /*! \class MMF::AudioEqualizer

    27   \internal

    28 */

    29 

    30 AudioEqualizer::AudioEqualizer(QObject *parent) : AbstractAudioEffect::AbstractAudioEffect(parent, createParams())

    31 {

    32 }

    33 

    34 void AudioEqualizer::parameterChanged(const int pid,

    35                                       const QVariant &value)

    36 {

    37     // There is no way to return an error from this function, so we just

    38     // have to trap and ignore exceptions.

    39     TRAP_IGNORE(static_cast<CAudioEqualizer *>(m_effect.data())->SetBandLevelL(pid, value.toInt()));

    40 }

    41 

    42 bool AudioEqualizer::activateOn(CPlayerType *player)

    43 {

    44     CAudioEqualizer *ptr = 0;

    45     QT_TRAP_THROWING(ptr = CAudioEqualizer::NewL(*player));

    46     m_effect.reset(ptr);

    47 

    48     return true;

    49 }

    50 

    51 QList<EffectParameter> AudioEqualizer::createParams()

    52 {

    53     QList<EffectParameter> retval;

    54 

    55     // We temporarily create an AudioPlayer, and run the effect on it, so

    56     // we can extract the readonly data we need.

    57     AudioPlayer dummyPlayer;

    58 

    59     CAudioEqualizer *eqPtr = 0;

    60     QT_TRAP_THROWING(eqPtr = CAudioEqualizer::NewL(*dummyPlayer.player());)

    61     QScopedPointer<CAudioEqualizer> e(eqPtr);

    62 

    63     TInt32 dbMin;

    64     TInt32 dbMax;

    65     e->DbLevelLimits(dbMin, dbMax);

    66 

    67     const int bandCount = e->NumberOfBands();

    68 

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

    70         const qint32 hz = e->CenterFrequency(i);

    71 

    72         const qint32 defVol = e->BandLevel(i);

    73 

    74         retval.append(EffectParameter(i,

    75                                       tr("Frequency band, %1 Hz").arg(hz),

    76                                       EffectParameter::LogarithmicHint,

    77                                       QVariant(qint32(defVol)),

    78                                       QVariant(qint32(dbMin)),

    79                                       QVariant(qint32(dbMax)),

    80                                       QVariantList(),

    81                                       QString()));

    82     }

    83 

    84     return retval;

    85 }

    86 

    87 QT_END_NAMESPACE