libcamera: pipeline_handler: Move waitingRequests_ into camera class

The waiting requests of one camera should not be able to influence
queuing to another camera. Currently a request that is in the
waitingQueue and waiting for preparation blocks all requests of other
cameras even if they are already prepared. To fix that replace the
single waitingRequests_ queue with one queue per camera.

Signed-off-by: Stefan Klug <stefan.klug@ideasonboard.com>
Reviewed-by: Umang Jain <uajain@igalia.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Tested-by: Sven Püschel <s.pueschel@pengutronix.de>

include/libcamera/internal/camera.h

@@ -10,6 +10,7 @@
 #include <atomic>
 #include <list>
 #include <memory>
+#include <queue>
 #include <set>
 #include <stdint.h>
 #include <string>
@@ -36,6 +37,7 @@ public:
 	const PipelineHandler *pipe() const { return pipe_.get(); }
 
 	std::list<Request *> queuedRequests_;
+	std::queue<Request *> waitingRequests_;
 	ControlInfoMap controlInfo_;
 	ControlList properties_;
 

include/libcamera/internal/pipeline_handler.h

@@ -8,7 +8,6 @@
 #pragma once
 
 #include <memory>
-#include <queue>
 #include <string>
 #include <sys/types.h>
 #include <vector>
@@ -89,13 +88,11 @@ private:
 	virtual void disconnect();
 
 	void doQueueRequest(Request *request);
-	void doQueueRequests();
+	void doQueueRequests(Camera *camera);
 
 	std::vector<std::shared_ptr<MediaDevice>> mediaDevices_;
 	std::vector<std::weak_ptr<Camera>> cameras_;
 
-	std::queue<Request *> waitingRequests_;
-
 	const char *name_;
 	unsigned int useCount_;