From 960fbf083be4391314e8fe36994a133763dbbe7d Mon Sep 17 00:00:00 2001
From: Christian Stromme <christian.stromme@qt.io>
Date: Tue, 22 Nov 2016 18:57:30 +0100
Subject: DirectShow: Expose the camera control interface

The interface is needed to implement Qt's camera control classes.

Change-Id: I468527dd1f5e9e7a0f8868f0b7addc3c069adf54
Reviewed-by: Yoann Lopes <yoann.lopes@qt.io>
---
 src/plugins/directshow/camera/dscamerasession.cpp | 20 ++++++++++++++++++++
 src/plugins/directshow/camera/dscamerasession.h   |  2 ++
 2 files changed, 22 insertions(+)

diff --git a/src/plugins/directshow/camera/dscamerasession.cpp b/src/plugins/directshow/camera/dscamerasession.cpp
index 40e54a94d..3f1187baa 100644
--- a/src/plugins/directshow/camera/dscamerasession.cpp
+++ b/src/plugins/directshow/camera/dscamerasession.cpp
@@ -334,6 +334,26 @@ void DSCameraSession::setImageProcessingParameter(
     }
 }
 
+bool DSCameraSession::getCameraControlInterface(IAMCameraControl **cameraControl) const
+{
+    if (!m_sourceFilter) {
+        qCDebug(qtDirectShowPlugin, "getCameraControlInterface failed: No capture filter!");
+        return false;
+    }
+
+    if (!cameraControl) {
+        qCDebug(qtDirectShowPlugin, "getCameraControlInterface failed: Invalid out argument!");
+        return false;
+    }
+
+    if (FAILED(m_sourceFilter->QueryInterface(IID_IAMCameraControl, reinterpret_cast<void **>(cameraControl)))) {
+        qCDebug(qtDirectShowPlugin, "getCameraControlInterface failed: Querying camera control failed!");
+        return false;
+    }
+
+    return true;
+}
+
 bool DSCameraSession::load()
 {
     unload();
diff --git a/src/plugins/directshow/camera/dscamerasession.h b/src/plugins/directshow/camera/dscamerasession.h
index 37730736f..6b6cb49b2 100644
--- a/src/plugins/directshow/camera/dscamerasession.h
+++ b/src/plugins/directshow/camera/dscamerasession.h
@@ -118,6 +118,8 @@ public:
             QCameraImageProcessingControl::ProcessingParameter,
             const QVariant &);
 
+    bool getCameraControlInterface(IAMCameraControl **cameraControl) const;
+
 Q_SIGNALS:
     void statusChanged(QCamera::Status);
     void imageExposed(int id);
-- 
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