Provide face and orientation info from gstreamer camera backend.

Cleans up duplicate device enumeration code so the devices listed by
the QMediaServiceProviderPlugin are the same as those in the
QVideoInputDeviceControl and includes face and orientation information
if available.

Change-Id: Iaa4c303c973bcf3e0f7c8c2fd7a7de629bccec86
Reviewed-by: Yoann Lopes <yoann.lopes@digia.com>

1 files changed, 48 insertions, 68 deletions

diff --git a/src/plugins/gstreamer/camerabin/camerabinserviceplugin.cpp b/src/plugins/gstreamer/camerabin/camerabinserviceplugin.cpp
index 3decd6070..bfb0c4935 100644
--- a/src/plugins/gstreamer/camerabin/camerabinserviceplugin.cpp
+++ b/src/plugins/gstreamer/camerabin/camerabinserviceplugin.cpp
@@ -55,12 +55,25 @@
 
 QT_BEGIN_NAMESPACE
 
+template <typename T, int N> static int lengthOf(const T(&)[N]) { return N; }
+
+CameraBinServicePlugin::CameraBinServicePlugin()
+    : m_sourceFactory(0)
+{
+}
+
+CameraBinServicePlugin::~CameraBinServicePlugin()
+{
+    if (m_sourceFactory)
+        gst_object_unref(GST_OBJECT(m_sourceFactory));
+}
+
 QMediaService* CameraBinServicePlugin::create(const QString &key)
 {
     QGstUtils::initializeGst();
 
     if (key == QLatin1String(Q_MEDIASERVICE_CAMERA))
-        return new CameraBinService(key);
+        return new CameraBinService(sourceFactory());
 
     qWarning() << "Gstreamer camerabin service plugin: unsupported key:" << key;
     return 0;
@@ -82,40 +95,24 @@ QMediaServiceProviderHint::Features CameraBinServicePlugin::supportedFeatures(
 
 QByteArray CameraBinServicePlugin::defaultDevice(const QByteArray &service) const
 {
-    if (service == Q_MEDIASERVICE_CAMERA) {
-        if (m_cameraDevices.isEmpty())
-            updateDevices();
-
-        return m_defaultCameraDevice;
-    }
-
-    return QByteArray();
+    return service == Q_MEDIASERVICE_CAMERA
+            ? QGstUtils::enumerateCameras(sourceFactory()).value(0).name.toUtf8()
+            : QByteArray();
 }
 
 QList<QByteArray> CameraBinServicePlugin::devices(const QByteArray &service) const
 {
-    if (service == Q_MEDIASERVICE_CAMERA) {
-        if (m_cameraDevices.isEmpty())
-            updateDevices();
 
-        return m_cameraDevices;
-    }
-
-    return QList<QByteArray>();
+    return service == Q_MEDIASERVICE_CAMERA
+            ? QGstUtils::cameraDevices(m_sourceFactory)
+            : QList<QByteArray>();
 }
 
-QString CameraBinServicePlugin::deviceDescription(const QByteArray &service, const QByteArray &device)
+QString CameraBinServicePlugin::deviceDescription(const QByteArray &service, const QByteArray &deviceName)
 {
-    if (service == Q_MEDIASERVICE_CAMERA) {
-        if (m_cameraDevices.isEmpty())
-            updateDevices();
-
-        for (int i=0; i<m_cameraDevices.count(); i++)
-            if (m_cameraDevices[i] == device)
-                return m_cameraDescriptions[i];
-    }
-
-    return QString();
+    return service == Q_MEDIASERVICE_CAMERA
+            ? QGstUtils::cameraDescription(deviceName, m_sourceFactory)
+            : QString();
 }
 
 QVariant CameraBinServicePlugin::deviceProperty(const QByteArray &service, const QByteArray &device, const QByteArray &property)
@@ -126,53 +123,36 @@ QVariant CameraBinServicePlugin::deviceProperty(const QByteArray &service, const
     return QVariant();
 }
 
-void CameraBinServicePlugin::updateDevices() const
+QCamera::Position CameraBinServicePlugin::cameraPosition(const QByteArray &deviceName) const
 {
-    m_defaultCameraDevice.clear();
-    m_cameraDevices.clear();
-    m_cameraDescriptions.clear();
-
-    QDir devDir("/dev");
-    devDir.setFilter(QDir::System);
-
-    QFileInfoList entries = devDir.entryInfoList(QStringList() << "video*");
-
-    foreach (const QFileInfo &entryInfo, entries) {
-        int fd = qt_safe_open(entryInfo.filePath().toLatin1().constData(), O_RDWR );
-        if (fd == -1)
-            continue;
-
-        bool isCamera = false;
-
-        v4l2_input input;
-        memset(&input, 0, sizeof(input));
-        for (; ::ioctl(fd, VIDIOC_ENUMINPUT, &input) >= 0; ++input.index) {
-            if (input.type == V4L2_INPUT_TYPE_CAMERA || input.type == 0) {
-                isCamera = ::ioctl(fd, VIDIOC_S_INPUT, input.index) != 0;
-                break;
-            }
-        }
-
-        if (isCamera) {
-            // find out its driver "name"
-            QString name;
-            struct v4l2_capability vcap;
-            memset(&vcap, 0, sizeof(struct v4l2_capability));
+    return QGstUtils::cameraPosition(deviceName, m_sourceFactory);
+}
 
-            if (ioctl(fd, VIDIOC_QUERYCAP, &vcap) != 0)
-                name = entryInfo.fileName();
-            else
-                name = QString((const char*)vcap.card);
-            //qDebug() << "found camera: " << name;
+int CameraBinServicePlugin::cameraOrientation(const QByteArray &deviceName) const
+{
+    return QGstUtils::cameraOrientation(deviceName, m_sourceFactory);
+}
 
-            m_cameraDevices.append(entryInfo.filePath().toLocal8Bit());
-            m_cameraDescriptions.append(name);
+GstElementFactory *CameraBinServicePlugin::sourceFactory() const
+{
+    if (!m_sourceFactory) {
+        GstElementFactory *factory = 0;
+        const QByteArray envCandidate = qgetenv("QT_GSTREAMER_CAMERABIN_SRC");
+        if (!envCandidate.isEmpty())
+            factory = gst_element_factory_find(envCandidate.constData());
+
+        static const char *candidates[] = { "subdevsrc", "wrappercamerabinsrc" };
+        for (int i = 0; !factory && i < lengthOf(candidates); ++i)
+            factory = gst_element_factory_find(candidates[i]);
+
+        if (factory) {
+            m_sourceFactory = GST_ELEMENT_FACTORY(gst_plugin_feature_load(
+                    GST_PLUGIN_FEATURE(factory)));
+            gst_object_unref((GST_OBJECT(factory)));
         }
-        qt_safe_close(fd);
     }
 
-    if (!m_cameraDevices.isEmpty())
-        m_defaultCameraDevice = m_cameraDevices.first();
+    return m_sourceFactory;
 }
 
 QT_END_NAMESPACE