From da9b436cd1be60da495f55fc4f4236136e7851f8 Mon Sep 17 00:00:00 2001
From: Dmytro Poplavskiy <dmytro.poplavskiy@nokia.com>
Date: Fri, 12 Aug 2011 11:52:47 +1000
Subject: Ported gstreamer camera backend from camerabin to camerabin2.

Change-Id: Ieb08df492e7b9cbfe35e93a056685cfdac6e704e
Reviewed-on: http://codereview.qt.nokia.com/2994
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Michael Goddard <michael.goddard@nokia.com>
---
 src/plugins/gstreamer/qgstcodecsinfo.cpp | 182 +++++++++++++++++++++++++++++++
 1 file changed, 182 insertions(+)
 create mode 100644 src/plugins/gstreamer/qgstcodecsinfo.cpp

(limited to 'src/plugins/gstreamer/qgstcodecsinfo.cpp')

diff --git a/src/plugins/gstreamer/qgstcodecsinfo.cpp b/src/plugins/gstreamer/qgstcodecsinfo.cpp
new file mode 100644
index 000000000..f823281d5
--- /dev/null
+++ b/src/plugins/gstreamer/qgstcodecsinfo.cpp
@@ -0,0 +1,182 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** 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.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);
+    }
+
+#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)
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