backendcapabilities.h

/*  This file is part of the KDE project
    Copyright (C) 2005-2006 Matthias Kretz <kretz@kde.org>
 
    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 of the License, or (at your option) version 3, or any
    later version accepted by the membership of KDE e.V. (or its
    successor approved by the membership of KDE e.V.), Nokia Corporation 
    (or its successors, if any) and the KDE Free Qt Foundation, which shall
    act as a proxy defined in Section 6 of version 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/>.
 
*/
 
#ifndef Phonon_BACKENDCAPABILITIES_H
#define Phonon_BACKENDCAPABILITIES_H
 
#include "phonon_export.h"
#include "objectdescription.h"
 
#include <QObject>
#include <QStringList>
 
#ifdef __QT_SYNCQT__
// Tell syncqt that the BackendCapabilities namespace should be treated like a class
#pragma qt_class(Phonon::BackendCapabilities)
#pragma qt_sync_stop_processing
#endif
 
template<class T> class QList;
 
namespace Phonon
{
 
/**
 * Collection of functions describing the capabilities of the Backend.
 *
 * \ingroup BackendInformation
 * \author Matthias Kretz <kretz@kde.org>
 */
namespace BackendCapabilities
{
    /** \class Notifier backendcapabilities.h phonon/BackendCapabilities
     * Notifications about backend capabilities.
     *
     * \ingroup BackendInformation
     */
    class Notifier : public QObject
    {
        Q_OBJECT
        Q_SIGNALS:
            /**
             * This signal is emitted if the capabilities have changed. This can
             * happen if the user has requested a backend change.
             */
            void capabilitiesChanged();
 
            /**
             * This signal is emitted when audio output devices were plugged or
             * unplugged.
             *
             * Check BackendCapabilities::availableAudioOutputDevices to get the
             * current list of available devices.
             */
            void availableAudioOutputDevicesChanged();
 
#ifndef PHONON_NO_AUDIOCAPTURE
            /**
             * This signal is emitted when audio capture devices were plugged or
             * unplugged.
             *
             * Check BackendCapabilities::availableAudioCaptureDevices to get the
             * current list of available devices.
             */
            void availableAudioCaptureDevicesChanged();
#endif //PHONON_NO_AUDIOCAPTURE
 
#ifndef PHONON_NO_VIDEOCAPTURE
            /**
             * This signal is emitted when video capture devices were plugged or
             * unplugged.
             *
             * Check BackendCapabilities::availableVideoCaptureDevices to get the
             * current list of available devices.
             */
            void availableVideoCaptureDevicesChanged();
#endif //PHONON_NO_VIDEOCAPTURE
    };
 
    /**
     * Use this function to get a QObject pointer to connect to one of the Notifier signals.
     *
     * \return a pointer to a QObject.
     *
     * To connect to the signal do the following:
     * \code
     * QObject::connect(BackendCapabilities::notifier(), SIGNAL(capabilitiesChanged()), ...
     * \endcode
     *
     * \see Notifier::capabilitiesChanged()
     * \see Notifier::availableAudioOutputDevicesChanged()
     * \see Notifier::availableAudioCaptureDevicesChanged()
     * \see Notifier::availableVideoCaptureDevicesChanged()
     */
    PHONON_EXPORT Notifier *notifier();
 
    /**
     * Returns a list of mime types that the Backend can decode.
     *
     * \see isMimeTypeAvailable()
     */
    PHONON_EXPORT QStringList availableMimeTypes();
 
    /**
     * Often all you want to know is whether one given MIME type can be
     * decoded by the backend. Use this method in favor of availableMimeTypes()
     * as it can give you a negative answer without having a backend loaded.
     *
     * \see availableMimeTypes();
     */
    PHONON_EXPORT bool isMimeTypeAvailable(const QString &mimeType);
 
    /**
     * Returns the audio output devices the backend supports.
     *
     * \return A list of AudioOutputDevice objects that give a name and
     * description for every supported audio output device.
     */
    PHONON_EXPORT QList<AudioOutputDevice> availableAudioOutputDevices();
 
#ifndef PHONON_NO_AUDIOCAPTURE
    /**
     * Returns the audio capture devices the backend supports.
     *
     * \return A list of AudioCaptureDevice objects that give a name and
     * description for every supported audio capture device.
     */
    PHONON_EXPORT QList<AudioCaptureDevice> availableAudioCaptureDevices();
#endif //PHONON_NO_AUDIOCAPTURE
 
    /**
     * Returns the video output devices the backend supports.
     *
     * \return A list of VideoOutputDevice objects that give a name and
     * description for every supported video output device.
     */
//    PHONON_EXPORT QList<VideoOutputDevice> availableVideoOutputDevices();
 
#ifndef PHONON_NO_VIDEOCAPTURE
    /**
     * Returns the video capture devices the backend supports.
     *
     * \return A list of VideoCaptureDevice objects that give a name and
     * description for every supported video capture device.
     */
    PHONON_EXPORT QList<VideoCaptureDevice> availableVideoCaptureDevices();
#endif //PHONON_NO_VIDEOCAPTURE
 
    /**
     * Returns the video capture devices that have audio capture capabilities
     * that the backend supports. In effect, these are both video and audio
     * capture devices and one can connect them to both a VideoWidget and an
     * AudioOutput, for example.
     *
     * The resulting VideoCaptureDevices have a "hasaudio" property to true.
     *
     * \note These devices appear both in availableVideoCaptureDevices() and
     * availableAudioCaptureDevices()
     *
     * \warning Creating two separate MediaObject instances for the same capture
     * device, one for video and the other for audio, most probably doesn't work.
     * But, if there are two separate devices, use Experimental::AVCapture.
     *
     * \see availableVideoCaptureDevices()
     * \see availableAudioCaptureDevices()
     * \see Experimental::AVCapture
     */
#if !defined(PHONON_NO_VIDEOCAPTURE) && !defined(PHONON_NO_AUDIOCAPTURE)
    PHONON_EXPORT QList<VideoCaptureDevice> availableAVCaptureDevices();
#endif // NOT PHONON_NO_VIDEOCAPTURE AND NOT PHONON_NO_AUDIOCAPTURE
 
    /**
     * Returns the visualization effects the backend supports.
     *
     * \return A list of VisualizationEffect objects that give a name and
     * description for every supported visualization effect.
     */
//    PHONON_EXPORT QList<VisualizationDescription> availableVisualizations();
 
#ifndef QT_NO_PHONON_EFFECT
    /**
     * Returns descriptions for the audio effects the backend supports.
     *
     * \return A list of AudioEffectDescription objects that give a name and
     * description for every supported audio effect.
     */
    PHONON_EXPORT QList<EffectDescription> availableAudioEffects();
#endif //QT_NO_PHONON_EFFECT
 
//X     /**
//X      * Returns descriptions for the video effects the backend supports.
//X      *
//X      * \return A list of VideoEffectDescription objects that give a name and
//X      * description for every supported video effect.
//X      */
//X     PHONON_EXPORT QList<EffectDescription> availableVideoEffects();
 
    /**
     * Returns descriptions for the audio codecs the backend supports.
     *
     * \return A list of AudioCodec objects that give a name and
     * description for every supported audio codec.
     */
//    PHONON_EXPORT QList<AudioCodecDescription> availableAudioCodecs();
 
    /**
     * Returns descriptions for the video codecs the backend supports.
     *
     * \return A list of VideoCodec objects that give a name and
     * description for every supported video codec.
     */
//    PHONON_EXPORT QList<VideoCodecDescription> availableVideoCodecs();
 
    /**
     * Returns descriptions for the container formats the backend supports.
     *
     * \return A list of ContainerFormat objects that give a name and
     * description for every supported container format.
     */
//    PHONON_EXPORT QList<ContainerFormatDescription> availableContainerFormats();
} // namespace BackendCapabilities
} // namespace Phonon
 
 
#endif // Phonon_BACKENDCAPABILITIES_H
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