cam: Only queue the exact number of requests asked for

The cam option --capture=N is suppose to only capture N requests. But if
the processing done for each request is large (such as writing it to a
slow disk) the current implementation could queue more than N requests
before the exit condition is detected and capturing stopped.

Solve this by only queueing N requests while still waiting for N
requests to complete before exiting.

Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/cam/capture.h b/src/cam/capture.h
index d21c95a2..c7c9dc00 100644
--- a/src/cam/capture.h
+++ b/src/cam/capture.h
@@ -32,6 +32,7 @@ public:
 private:
 	int capture(libcamera::FrameBufferAllocator *allocator);
 
+	int queueRequest(libcamera::Request *request);
 	void requestComplete(libcamera::Request *request);
 	void processRequest(libcamera::Request *request);
 
@@ -43,6 +44,7 @@ private:
 	uint64_t last_;
 
 	EventLoop *loop_;
+	unsigned int queueCount_;
 	unsigned int captureCount_;
 	unsigned int captureLimit_;