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/* 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 <gst/gst.h>
#include "common.h"
#include "gsthelper.h"
#include <QtCore/QList>
QT_BEGIN_NAMESPACE
namespace Phonon
{
namespace Gstreamer
{
/**
* Probes a gstElement for a list of settable string-property values
*
* @return a QStringList containing a list of allwed string values for the given
* element
*/
QList<QByteArray> GstHelper::extractProperties(GstElement *elem, const QByteArray &value)
{
Q_ASSERT(elem);
QList<QByteArray> list;
if (GST_IS_PROPERTY_PROBE(elem)) {
GstPropertyProbe *probe = GST_PROPERTY_PROBE(elem);
const GParamSpec *devspec = 0;
GValueArray *array = NULL;
if ((devspec = gst_property_probe_get_property (probe, value))) {
if ((array = gst_property_probe_probe_and_get_values (probe, devspec))) {
for (unsigned int device = 0; device < array->n_values; device++) {
GValue *deviceId = g_value_array_get_nth (array, device);
list.append(g_value_get_string(deviceId));
}
}
if (array)
g_value_array_free (array);
}
}
return list;
}
/**
* Sets the string value of a GstElement's property
*
* @return false if the value could not be set.
*/
bool GstHelper::setProperty(GstElement *elem, const char *propertyName, const QByteArray &propertyValue)
{
Q_ASSERT(elem);
Q_ASSERT(propertyName && strlen(propertyName));
if (GST_IS_PROPERTY_PROBE(elem) && gst_property_probe_get_property( GST_PROPERTY_PROBE( elem), propertyName ) ) {
g_object_set(G_OBJECT(elem), propertyName, propertyValue.constData(), (const char*)NULL);
return true;
}
return false;
}
/**
* Queries an element for the value of an object property
*/
QByteArray GstHelper::property(GstElement *elem, const char *propertyName)
{
Q_ASSERT(elem);
Q_ASSERT(propertyName && strlen(propertyName));
QByteArray retVal;
if (GST_IS_PROPERTY_PROBE(elem) && gst_property_probe_get_property( GST_PROPERTY_PROBE(elem), propertyName)) {
gchar *value = NULL;
g_object_get (G_OBJECT(elem), propertyName, &value, (const char*)NULL);
retVal = QByteArray(value);
g_free (value);
}
return retVal;
}
/**
* Queries a GstObject for it's name
*/
QByteArray GstHelper::name(GstObject *obj)
{
Q_ASSERT(obj);
QByteArray retVal;
gchar *value = NULL;
if ((value = gst_object_get_name (obj))) {
retVal = QByteArray(value);
g_free (value);
}
return retVal;
}
/***
* Creates an instance of a playbin with "audio-src" and
* "video-src" ghost pads to allow redirected output streams.
*
* ### This function is probably not required now that MediaObject is based
* on decodebin directly.
*/
GstElement* GstHelper::createPluggablePlaybin()
{
GstElement *playbin = 0;
//init playbin and add to our pipeline
playbin = gst_element_factory_make("playbin2", NULL);
//Create an identity element to redirect sound
GstElement *audioSinkBin = gst_bin_new (NULL);
GstElement *audioPipe = gst_element_factory_make("identity", NULL);
gst_bin_add(GST_BIN(audioSinkBin), audioPipe);
//Create a sinkpad on the identity
GstPad *audiopad = gst_element_get_pad (audioPipe, "sink");
gst_element_add_pad (audioSinkBin, gst_ghost_pad_new ("sink", audiopad));
gst_object_unref (audiopad);
//Create an "audio_src" source pad on the playbin
GstPad *audioPlaypad = gst_element_get_pad (audioPipe, "src");
gst_element_add_pad (playbin, gst_ghost_pad_new ("audio_src", audioPlaypad));
gst_object_unref (audioPlaypad);
//Done with our audio redirection
g_object_set (G_OBJECT(playbin), "audio-sink", audioSinkBin, (const char*)NULL);
// * * Redirect video to "video_src" pad : * *
//Create an identity element to redirect sound
GstElement *videoSinkBin = gst_bin_new (NULL);
GstElement *videoPipe = gst_element_factory_make("identity", NULL);
gst_bin_add(GST_BIN(videoSinkBin), videoPipe);
//Create a sinkpad on the identity
GstPad *videopad = gst_element_get_pad (videoPipe, "sink");
gst_element_add_pad (videoSinkBin, gst_ghost_pad_new ("sink", videopad));
gst_object_unref (videopad);
//Create an "audio_src" source pad on the playbin
GstPad *videoPlaypad = gst_element_get_pad (videoPipe, "src");
gst_element_add_pad (playbin, gst_ghost_pad_new ("video_src", videoPlaypad));
gst_object_unref (videoPlaypad);
//Done with our video redirection
g_object_set (G_OBJECT(playbin), "video-sink", videoSinkBin, (const char*)NULL);
return playbin;
}
} //namespace Gstreamer
} //namespace Phonon
QT_END_NAMESPACE
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