v4l2: camera: Merge getStreamConfig() with open()

The V4L2CameraProxy always calls V4L2Camera::getStreamConfig() right
after V4L2Camera::open(), and never afterwards. Simplify the code by
returning the initial configuration from V4L2Camera::open() and removing
V4L2Camera::getStreamConfig().

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>

src/v4l2/v4l2_camera.cpp

@@ -28,7 +28,7 @@ V4L2Camera::~V4L2Camera()
 	close();
 }
 
-int V4L2Camera::open()
+int V4L2Camera::open(StreamConfiguration *streamConfig)
 {
 	if (camera_->acquire() < 0) {
 		LOG(V4L2Compat, Error) << "Failed to acquire camera";
@@ -43,6 +43,7 @@ int V4L2Camera::open()
 
 	bufferAllocator_ = new FrameBufferAllocator(camera_);
 
+	*streamConfig = config_->at(0);
 	return 0;
 }
 
@@ -64,11 +65,6 @@ void V4L2Camera::unbind()
 	efd_ = -1;
 }
 
-void V4L2Camera::getStreamConfig(StreamConfiguration *streamConfig)
-{
-	*streamConfig = config_->at(0);
-}
-
 std::vector<V4L2Camera::Buffer> V4L2Camera::completedBuffers()
 {
 	std::vector<Buffer> v;

src/v4l2/v4l2_camera.h

@@ -37,11 +37,11 @@ public:
 	V4L2Camera(std::shared_ptr<Camera> camera);
 	~V4L2Camera();
 
-	int open();
+	int open(StreamConfiguration *streamConfig);
 	void close();
 	void bind(int efd);
 	void unbind();
-	void getStreamConfig(StreamConfiguration *streamConfig);
+
 	std::vector<Buffer> completedBuffers();
 
 	int configure(StreamConfiguration *streamConfigOut,

src/v4l2/v4l2_camera_proxy.cpp

@@ -63,13 +63,12 @@ int V4L2CameraProxy::open(V4L2CameraFile *file)
 	 * with count = 0.
 	 */
 
-	int ret = vcam_->open();
+	int ret = vcam_->open(&streamConfig_);
 	if (ret < 0) {
 		refcount_--;
 		return ret;
 	}
 
-	vcam_->getStreamConfig(&streamConfig_);
 	setFmtFromConfig(streamConfig_);
 
 	files_.insert(file);