source: trunk/src/3rdparty/phonon/ds9/effect.cpp

/*  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 "effect.h"
#include <phonon/effectparameter.h>

#include <medparam.h>
#include <dmo.h>
#include <dmodshow.h>

QT_BEGIN_NAMESPACE

#ifndef QT_NO_PHONON_EFFECT

namespace Phonon
{
    namespace DS9
    {
        Effect::Effect(CLSID effectClass, QObject *parent)
            : BackendNode(parent)
        {
            //creation of the filter
            for(int i = 0; i < FILTER_COUNT; ++i) {
                Filter &filter = m_filters[i];
                filter = Filter(CLSID_DMOWrapperFilter, IID_IBaseFilter);
                Q_ASSERT(filter);
                ComPointer<IDMOWrapperFilter> wrapper(filter, IID_IDMOWrapperFilter);
                Q_ASSERT(wrapper);
                wrapper->Init(effectClass, DMOCATEGORY_AUDIO_EFFECT);
            }
        }

        Effect::Effect(QObject *parent) : BackendNode(parent)
        {
            //at this point the QVector of Filter should be filled
        }

        Effect::~Effect()
        {
        }

        QList<Phonon::EffectParameter> Effect::parameters() const
        {
            QList<Phonon::EffectParameter> ret;
            ComPointer<IMediaParamInfo> paramInfo(m_filters[0], IID_IMediaParamInfo);
            if (!paramInfo) {
                return ret;
            }
            DWORD paramCount = 0;
            paramInfo->GetParamCount( &paramCount);

            for(quint32 i = 0; i < paramCount; i++) {
                MP_PARAMINFO info;
                HRESULT hr = paramInfo->GetParamInfo(i, &info);
                Q_ASSERT(SUCCEEDED(hr));
                WCHAR *name = 0;
                hr = paramInfo->GetParamText(i, &name);
                Q_ASSERT(SUCCEEDED(hr));
                QVariant def, min, max;

                QVariantList values;

                switch(info.mpType)
                {
                case MPT_ENUM:
                    {
                        WCHAR *current = name;
                        current += wcslen(current) + 1; //skip the name
                        current += wcslen(current) + 1; //skip the unit
                        for(; *current; current += wcslen(current) + 1) {
                            values.append( QString::fromWCharArray(current) );
                        }
                    }
                    //FALLTHROUGH
                case MPT_INT:
                    def = int(info.mpdNeutralValue);
                    min = int(info.mpdMinValue);
                    max = int(info.mpdMaxValue);
                    break;
                case MPT_FLOAT:
                    def = info.mpdNeutralValue;
                    min = info.mpdMinValue;
                    max = info.mpdMaxValue;
                    break;
                case MPT_BOOL:
                    def = bool(info.mpdNeutralValue);
                    break;
                case MPT_MAX:
                    //Reserved ms-help://MS.PSDKSVR2003R2.1033/directshow/htm/mp_typeenumeration.htm
                    break;
                }

                Phonon::EffectParameter::Hints hint = info.mopCaps == MP_CAPS_CURVE_INVSQUARE ?
                    Phonon::EffectParameter::LogarithmicHint : Phonon::EffectParameter::Hints(0);

                const QString n = QString::fromWCharArray(name);
                ret.append(Phonon::EffectParameter(i, n, hint, def, min, max, values));
                ::CoTaskMemFree(name); //let's free the memory
            }
            return ret;
        }

        QVariant Effect::parameterValue(const Phonon::EffectParameter &p) const
        {
            QVariant ret;
            ComPointer<IMediaParams> params(m_filters[0], IID_IMediaParams);
            Q_ASSERT(params);
            MP_DATA data;
            HRESULT hr = params->GetParam(p.id(), &data);
            if(SUCCEEDED(hr))
                return data;
            else
                return QVariant();
        }

        void Effect::setParameterValue(const Phonon::EffectParameter &p, const QVariant &v)
        {
            if (v.isNull()) {
                return;
            }

            for(int i=0; i < FILTER_COUNT ; ++i) {
                const Filter &filter = m_filters[i];
                ComPointer<IMediaParams> params(filter, IID_IMediaParams);
                Q_ASSERT(params);

                params->SetParam(p.id(), v.toFloat());
            }
        }

    }
}

#endif //QT_NO_PHONON_EFFECT

QT_END_NAMESPACE

#include "moc_effect.cpp"