Fix writing orientation and date exif tags in camerabin.

Orientation tags need to be transformed from the string tag returned
by gstreamer to the orientation in degrees.  Date tags need to be
inserted with gst_date_time_new_local_time.  Finally setting a tag
value shouldn't clear all other tags.

Change-Id: I28922148251084c12cf6c93d9b097fa5df41da9d
Reviewed-by: Yoann Lopes <yoann.lopes@digia.com>

src/plugins/gstreamer/camerabin/camerabinmetadata.cpp

@@ -54,12 +54,43 @@ struct QGstreamerMetaDataKeyLookup
     const char *token;
 };
 
+static QVariant fromGStreamerOrientation(const QVariant &value)
+{
+    // Note gstreamer tokens either describe the counter clockwise rotation of the
+    // image or the clockwise transform to apply to correct the image.  The orientation
+    // value returned is the clockwise rotation of the image.
+    const QString token = value.toString();
+    if (token == QStringLiteral("rotate-90"))
+        return 270;
+    else if (token == QStringLiteral("rotate-180"))
+        return 180;
+    else if (token == QStringLiteral("rotate-270"))
+        return 90;
+    else
+        return 0;
+}
+
+static QVariant toGStreamerOrientation(const QVariant &value)
+{
+    switch (value.toInt()) {
+    case 90:
+        return QStringLiteral("rotate-270");
+    case 180:
+        return QStringLiteral("rotate-180");
+    case 270:
+        return QStringLiteral("rotate-90");
+    default:
+        return QStringLiteral("rotate-0");
+    }
+}
+
 static const QGstreamerMetaDataKeyLookup qt_gstreamerMetaDataKeys[] =
 {
     { QMediaMetaData::Title, GST_TAG_TITLE },
     //{ QMediaMetaData::SubTitle, 0 },
     //{ QMediaMetaData::Author, 0 },
     { QMediaMetaData::Comment, GST_TAG_COMMENT },
+    { QMediaMetaData::Date, GST_TAG_DATE_TIME },
     { QMediaMetaData::Description, GST_TAG_DESCRIPTION },
     //{ QMediaMetaData::Category, 0 },
     { QMediaMetaData::Genre, GST_TAG_GENRE },
@@ -120,7 +151,9 @@ static const QGstreamerMetaDataKeyLookup qt_gstreamerMetaDataKeys[] =
     //{ QMediaMetaData::CameraManufacturer, 0 },
     //{ QMediaMetaData::CameraModel, 0 },
     //{ QMediaMetaData::Event, 0 },
-    //{ QMediaMetaData::Subject, 0 }
+    //{ QMediaMetaData::Subject, 0 },
+
+    { QMediaMetaData::Orientation, GST_TAG_IMAGE_ORIENTATION }
 };
 
 CameraBinMetaData::CameraBinMetaData(QObject *parent)
@@ -130,6 +163,10 @@ CameraBinMetaData::CameraBinMetaData(QObject *parent)
 
 QVariant CameraBinMetaData::metaData(const QString &key) const
 {
+    if (key == QMediaMetaData::Orientation) {
+        return fromGStreamerOrientation(m_values.value(QByteArray(GST_TAG_IMAGE_ORIENTATION)));
+    }
+
     static const int count = sizeof(qt_gstreamerMetaDataKeys) / sizeof(QGstreamerMetaDataKeyLookup);
 
     for (int i = 0; i < count; ++i) {
@@ -144,6 +181,15 @@ QVariant CameraBinMetaData::metaData(const QString &key) const
 
 void CameraBinMetaData::setMetaData(const QString &key, const QVariant &value)
 {
+    if (key == QMediaMetaData::Orientation) {
+        m_values.insert(QByteArray(GST_TAG_IMAGE_ORIENTATION), toGStreamerOrientation(value));
+
+        emit QMetaDataWriterControl::metaDataChanged();
+        emit metaDataChanged(m_values);
+
+        return;
+    }
+
     static const int count = sizeof(qt_gstreamerMetaDataKeys) / sizeof(QGstreamerMetaDataKeyLookup);
 
     for (int i = 0; i < count; ++i) {

src/plugins/gstreamer/camerabin/camerabinsession.cpp

@@ -76,6 +76,7 @@
 #include <QtGui/qdesktopservices.h>
 
 #include <QtGui/qimage.h>
+#include <QtCore/qdatetime.h>
 
 //#define CAMERABIN_DEBUG 1
 //#define CAMERABIN_DEBUG_DUMP_BIN 1
@@ -737,7 +738,7 @@ void CameraBinSession::setMetaData(const QMap<QByteArray, QVariant> &data)
                 switch(tagValue.type()) {
                     case QVariant::String:
                         gst_tag_setter_add_tags(GST_TAG_SETTER(element),
-                            GST_TAG_MERGE_REPLACE_ALL,
+                            GST_TAG_MERGE_REPLACE,
                             tagName.toUtf8().constData(),
                             tagValue.toString().toUtf8().constData(),
                             NULL);
@@ -745,18 +746,29 @@ void CameraBinSession::setMetaData(const QMap<QByteArray, QVariant> &data)
                     case QVariant::Int:
                     case QVariant::LongLong:
                         gst_tag_setter_add_tags(GST_TAG_SETTER(element),
-                            GST_TAG_MERGE_REPLACE_ALL,
+                            GST_TAG_MERGE_REPLACE,
                             tagName.toUtf8().constData(),
                             tagValue.toInt(),
                             NULL);
                         break;
                     case QVariant::Double:
                         gst_tag_setter_add_tags(GST_TAG_SETTER(element),
-                            GST_TAG_MERGE_REPLACE_ALL,
+                            GST_TAG_MERGE_REPLACE,
                             tagName.toUtf8().constData(),
                             tagValue.toDouble(),
                             NULL);
                         break;
+                    case QVariant::DateTime: {
+                        QDateTime date = tagValue.toDateTime().toLocalTime();
+                        gst_tag_setter_add_tags(GST_TAG_SETTER(element),
+                            GST_TAG_MERGE_REPLACE,
+                            tagName.toUtf8().constData(),
+                            gst_date_time_new_local_time(
+                                        date.date().year(), date.date().month(), date.date().day(),
+                                        date.time().hour(), date.time().minute(), date.time().second()),
+                            NULL);
+                        break;
+                    }
                     default:
                         break;
                 }
@@ -932,6 +944,7 @@ bool CameraBinSession::processBusMessage(const QGstreamerMessage &message)
                             emit stateChanged(m_state = QCamera::UnloadedState);
                         break;
                     case GST_STATE_READY:
+                        setMetaData(m_metaData);
                         if (m_state != QCamera::LoadedState)
                             emit stateChanged(m_state = QCamera::LoadedState);
                         break;