Split gstreamer plugin into smaller plugins providing fewer services

The gstreamer blob has been split into four plugins: audiodecoder,
camerabin, mediacapture, and mediaplayer.
Note: camerabin is still disabled because it is untested camerabin2
implementation.
A new qmake configuration use_gstreamer_camera has been introduced
and is needed for the mediacapture plugin to expose the camera
service. This configuration has been disabled by default.
Shared functionality has been moved to the internal gsttools library.

Change-Id: Ifb2604f440cfa97513d39f5d7978766c88eaec45
Reviewed-by: Michael Goddard <michael.goddard@nokia.com>

1 files changed, 183 insertions, 0 deletions

diff --git a/src/gsttools/qgstcodecsinfo.cpp b/src/gsttools/qgstcodecsinfo.cpp
new file mode 100644
index 000000000..2d39977a3
--- /dev/null
+++ b/src/gsttools/qgstcodecsinfo.cpp
@@ -0,0 +1,183 @@
+/****************************************************************************
+**
+** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/
+**
+** This file is part of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** This file may be used under the terms of the GNU Lesser General Public
+** License version 2.1 as published by the Free Software Foundation and
+** appearing in the file LICENSE.LGPL included in the packaging of this
+** file. Please review the following information to ensure the GNU Lesser
+** General Public License version 2.1 requirements will be met:
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License version 3.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of this
+** file. Please review the following information to ensure the GNU General
+** Public License version 3.0 requirements will be met:
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qgstcodecsinfo_p.h"
+
+#include <QtCore/qset.h>
+
+#ifdef QMEDIA_GSTREAMER_CAMERABIN
+#include <gst/pbutils/pbutils.h>
+#include <gst/pbutils/encoding-profile.h>
+#endif
+
+
+QGstCodecsInfo::QGstCodecsInfo(QGstCodecsInfo::ElementType elementType)
+{
+
+#if GST_CHECK_VERSION(0,10,31)
+
+    GstElementFactoryListType gstElementType = 0;
+    switch (elementType) {
+    case AudioEncoder:
+        gstElementType = GST_ELEMENT_FACTORY_TYPE_AUDIO_ENCODER;
+        break;
+    case VideoEncoder:
+        gstElementType = GST_ELEMENT_FACTORY_TYPE_VIDEO_ENCODER;
+        break;
+    case Muxer:
+        gstElementType = GST_ELEMENT_FACTORY_TYPE_MUXER;
+        break;
+    }
+
+    GstCaps *allCaps = supportedElementCaps(gstElementType);
+    GstCaps *caps = gst_caps_new_empty();
+
+    uint codecsCount = gst_caps_get_size(allCaps);
+    for (uint i=0; i<codecsCount; i++) {
+        gst_caps_append_structure(caps, gst_caps_steal_structure(allCaps, 0));
+        gchar * capsString = gst_caps_to_string(caps);
+
+        QString codec = QLatin1String(capsString);
+        m_codecs.append(codec);
+
+#ifdef QMEDIA_GSTREAMER_CAMERABIN
+        gchar *description = gst_pb_utils_get_codec_description(caps);
+        m_codecDescriptions.insert(codec, QString::fromUtf8(description));
+
+        if (description)
+            g_free(description);
+#else
+        m_codecDescriptions.insert(codec, codec);
+#endif
+
+        if (capsString)
+            g_free(capsString);
+
+        gst_caps_remove_structure(caps, 0);
+    }
+#else
+    Q_UNUSED(elementType);
+#endif // GST_CHECK_VERSION(0,10,31)
+}
+
+QStringList QGstCodecsInfo::supportedCodecs() const
+{
+    return m_codecs;
+}
+
+QString QGstCodecsInfo::codecDescription(const QString &codec) const
+{
+    return m_codecDescriptions.value(codec);
+}
+
+#if GST_CHECK_VERSION(0,10,31)
+
+/*!
+  List all supported caps for all installed elements of type \a elementType.
+
+  Caps are simplified to mime type and a few field necessary to distinguish
+  different codecs like mpegversion or layer.
+ */
+GstCaps* QGstCodecsInfo::supportedElementCaps(GstElementFactoryListType elementType,
+                                         GstRank minimumRank,
+                                         GstPadDirection padDirection)
+{
+    GList *elements = gst_element_factory_list_get_elements(elementType, minimumRank);
+    GstCaps *res = gst_caps_new_empty();
+
+    QSet<QByteArray> fakeEncoderMimeTypes;
+    fakeEncoderMimeTypes << "unknown/unknown"
+                  << "audio/x-raw-int" << "audio/x-raw-float"
+                  << "video/x-raw-yuv" << "video/x-raw-rgb";
+
+    QSet<QByteArray> fieldsToAdd;
+    fieldsToAdd << "mpegversion" << "layer" << "layout" << "raversion"
+                << "wmaversion" << "wmvversion" << "variant";
+
+    GList *element = elements;
+    while (element) {
+        GstElementFactory *factory = (GstElementFactory *)element->data;
+        element = element->next;
+
+        const GList *padTemplates = gst_element_factory_get_static_pad_templates(factory);
+        while (padTemplates) {
+            GstStaticPadTemplate *padTemplate = (GstStaticPadTemplate *)padTemplates->data;
+            padTemplates = padTemplates->next;
+
+            if (padTemplate->direction == padDirection) {
+                const GstCaps *caps = gst_static_caps_get(&padTemplate->static_caps);
+                for (uint i=0; i<gst_caps_get_size(caps); i++) {
+                    const GstStructure *structure = gst_caps_get_structure(caps, i);
+
+                    //skip "fake" encoders
+                    if (fakeEncoderMimeTypes.contains(gst_structure_get_name(structure)))
+                        continue;
+
+                    GstStructure *newStructure = gst_structure_new(gst_structure_get_name(structure), NULL);
+
+                    //add structure fields to distinguish between formats with similar mime types,
+                    //like audio/mpeg
+                    for (int j=0; j<gst_structure_n_fields(structure); j++) {
+                        const gchar* fieldName = gst_structure_nth_field_name(structure, j);
+                        if (fieldsToAdd.contains(fieldName)) {
+                            const GValue *value = gst_structure_get_value(structure, fieldName);
+                            GType valueType = G_VALUE_TYPE(value);
+
+                            //don't add values of range type,
+                            //gst_pb_utils_get_codec_description complains about not fixed caps
+
+                            if (valueType != GST_TYPE_INT_RANGE && valueType != GST_TYPE_DOUBLE_RANGE &&
+                                valueType != GST_TYPE_FRACTION_RANGE && valueType != GST_TYPE_LIST &&
+                                valueType != GST_TYPE_ARRAY)
+                                gst_structure_set_value(newStructure, fieldName, value);
+                        }
+                    }
+
+                    gst_caps_merge_structure(res, newStructure);
+                }
+            }
+        }
+    }
+    gst_plugin_feature_list_free(elements);
+
+    return res;
+}
+#endif //GST_CHECK_VERSION(0,10,31)