v4l2: v4l2_camera_proxy: Use stream config in tryFormat

For handling try_fmt, the values should be filled in by validating the
stream configuration, and not by recalculating them or manually checking
against the cached list of formats and sizes. Add a new
V4L2Camera::validateConfiguration() function to validate a configuration
and use it to obtain size, format, stride, and frameSize values.

If the format negotiation fails, return error from try_fmt and s_fmt.

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

1 files changed, 1 insertions, 1 deletions

diff --git a/src/v4l2/v4l2_camera_proxy.h b/src/v4l2/v4l2_camera_proxy.h
index e9626942..f06b5b87 100644
--- a/src/v4l2/v4l2_camera_proxy.h
+++ b/src/v4l2/v4l2_camera_proxy.h
@@ -41,7 +41,7 @@ private:
 	bool validateMemoryType(uint32_t memory);
 	void setFmtFromConfig(StreamConfiguration &streamConfig);
 	void querycap(std::shared_ptr<Camera> camera);
-	void tryFormat(struct v4l2_format *arg);
+	int tryFormat(struct v4l2_format *arg);
 	enum v4l2_priority maxPriority();
 	void updateBuffers();
 	void freeBuffers();