libcamera: converter: Add function to check if a stream was configured

Add a isConfigured() function to be able to check if a given stream was
configured in the converter. This is useful in pipelines to either query
device or stream specific crop bounds depending on whether the stream is
configured or not.

Signed-off-by: Stefan Klug <stefan.klug@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>

include/libcamera/internal/converter.h

@@ -56,6 +56,7 @@ public:
 
 	virtual int configure(const StreamConfiguration &inputCfg,
 			      const std::vector<std::reference_wrapper<StreamConfiguration>> &outputCfgs) = 0;
+	virtual bool isConfigured(const Stream *stream) const = 0;
 	virtual int exportBuffers(const Stream *stream, unsigned int count,
 				  std::vector<std::unique_ptr<FrameBuffer>> *buffers) = 0;
 

include/libcamera/internal/converter/converter_v4l2_m2m.h

@@ -50,6 +50,7 @@ public:
 	int configure(const StreamConfiguration &inputCfg,
 		      const std::vector<std::reference_wrapper<StreamConfiguration>>
 		      &outputCfg) override;
+	bool isConfigured(const Stream *stream) const override;
 	int exportBuffers(const Stream *stream, unsigned int count,
 			  std::vector<std::unique_ptr<FrameBuffer>> *buffers) override;