/*  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 <gst/interfaces/propertyprobe.h>

#include "effectmanager.h"

#include "backend.h"

#include "gsthelper.h"

/*

 * This class manages the list of currently

 * available audio effects.

 */

QT_BEGIN_NAMESPACE

namespace Phonon

{

namespace Gstreamer

{

EffectInfo::EffectInfo(const QString &name, const QString&description, const QString&author)

        : m_name(name)

        , m_description(description)

        , m_author(author) {}

EffectManager::EffectManager(Backend *backend)

        : QObject(backend)

        , m_backend(backend)

{

    GList* factoryList = gst_registry_get_feature_list(gst_registry_get_default (), GST_TYPE_ELEMENT_FACTORY);

    QString name, klass, description, author;

    for (GList* iter = g_list_first(factoryList) ; iter != NULL ; iter = g_list_next(iter)) {

        GstPluginFeature *feature = GST_PLUGIN_FEATURE(iter->data);

        klass = gst_element_factory_get_klass(GST_ELEMENT_FACTORY(feature));

        if ( klass == "Filter/Effect/Audio" ) {

            name =  GST_PLUGIN_FEATURE_NAME(feature);

            // These plugins simply make no sense to the frontend:

            // "audiorate" Should be internal

            // "volume" not needed

            // "equalizer-nbands" not really useful at the moment

            // These plugins simply don't work or have major stability issues:

            // "iir" Does not seem to do much at the moment

            // "audioinvert" Only works for some streams, should be invesigated

            // "lpwsinc" Crashes for large values of filter kernel

            // "name" Crashes for large values of filter kernel

            // Seems to be working, but not well tested:

            // name == "rglimiter" Seems functional

            // name == "rgvolume" Seems to be working

            QString pluginString = qgetenv("PHONON_GST_ALL_EFFECTS");

            bool acceptAll = pluginString.toInt();

            if (acceptAll 

                // Plugins that have been accepted so far

                 || name == "audiopanorama" 

                 || name == "audioamplify" 

                 || name == "audiodynamic" 

                 || name == "equalizer-10bands" 

                 || name == "speed") 

                {

                    description = gst_element_factory_get_description (GST_ELEMENT_FACTORY(feature));

                    author = gst_element_factory_get_author (GST_ELEMENT_FACTORY(feature));

                    EffectInfo *effect = new EffectInfo(name, description, author);

                    m_audioEffectList.append(effect);

            }

        }

    }

    g_list_free(factoryList);

}

EffectManager::~EffectManager()

{

    qDeleteAll(m_audioEffectList);

    m_audioEffectList.clear();

}

/**

  * Returns a list of available audio effects

  */

const QList<EffectInfo*> EffectManager::audioEffects() const

{

    return m_audioEffectList;

}

}

}

QT_END_NAMESPACE