DirectShow: Implement image capture settings

Added camera image encoder control that
1. applies image encoder settings (resolution and codec) used to capture images
2. returns supported image codecs from
QImageWriter::supportedImageFormats
3. returns supported resolutions

Since DirectShow camera session uses QImage based on QVideoFrame
image encoder control returns viewfinder supported resolutions.
Not available if camera is not loaded.

Setting resolution via encoder control causes viewfinder resolution to be ignored.

Task-number: QTBUG-32743
Change-Id: I1de3ca9c6543937cb62f73cb64a81d23b0d5c4c9
Reviewed-by: Oliver Wolff <oliver.wolff@qt.io>
Reviewed-by: Andy Shaw <andy.shaw@qt.io>
Reviewed-by: Christian Stromme <christian.stromme@qt.io>

1 files changed, 8 insertions, 0 deletions

diff --git a/src/plugins/directshow/camera/dscamerasession.h b/src/plugins/directshow/camera/dscamerasession.h
index ac861ae58..361a0220e 100644
--- a/src/plugins/directshow/camera/dscamerasession.h
+++ b/src/plugins/directshow/camera/dscamerasession.h
@@ -51,6 +51,7 @@
 #include <QtMultimedia/qvideosurfaceformat.h>
 #include <QtMultimedia/qcameraimageprocessingcontrol.h>
 #include <QtMultimedia/qcameraimagecapture.h>
+#include <QtMultimedia/qmediaencodersettings.h>
 #include <private/qmediastoragelocation_p.h>
 
 #include <tchar.h>
@@ -129,6 +130,11 @@ public:
     void addVideoProbe(DirectShowVideoProbeControl *probe);
     void removeVideoProbe(DirectShowVideoProbeControl *probe);
 
+    QList<QSize> supportedResolutions(bool *continuous) const;
+    QImageEncoderSettings imageEncoderSettings() const { return m_imageEncoderSettings; }
+    void setImageEncoderSettings(const QImageEncoderSettings &settings)
+    { m_imageEncoderSettings = settings; }
+
 Q_SIGNALS:
     void statusChanged(QCamera::Status);
     void imageExposed(int id);
@@ -217,6 +223,8 @@ private:
     QMutex m_probeMutex;
     DirectShowVideoProbeControl *m_videoProbeControl;
 
+    QImageEncoderSettings m_imageEncoderSettings;
+
     // Internal state
     QCamera::Status m_status;
     QTimer m_deviceLostEventTimer;