libcamera, android, cam, gstreamer, qcam, v4l2: Reuse Request

Allow reuse of the Request object by implementing reuse(). This means
the applications now have the responsibility of freeing the Request
objects, so make all libcamera users (cam, qcam, v4l2-compat, gstreamer,
android) do so.

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

1 files changed, 7 insertions, 22 deletions

diff --git a/src/cam/capture.cpp b/src/cam/capture.cpp
index 5510c009..8c8faa4b 100644
--- a/src/cam/capture.cpp
+++ b/src/cam/capture.cpp
@@ -65,6 +65,8 @@ int Capture::run(const OptionsParser::Options &options)
 		writer_ = nullptr;
 	}
 
+	requests_.clear();
+
 	delete allocator;
 
 	return ret;
@@ -92,9 +94,8 @@ int Capture::capture(FrameBufferAllocator *allocator)
 	 * example pushing a button. For now run all streams all the time.
 	 */
 
-	std::vector<Request *> requests;
 	for (unsigned int i = 0; i < nbuffers; i++) {
-		Request *request = camera_->createRequest();
+		std::unique_ptr<Request> request = camera_->createRequest();
 		if (!request) {
 			std::cerr << "Can't create request" << std::endl;
 			return -ENOMEM;
@@ -117,7 +118,7 @@ int Capture::capture(FrameBufferAllocator *allocator)
 				writer_->mapBuffer(buffer.get());
 		}
 
-		requests.push_back(request);
+		requests_.push_back(std::move(request));
 	}
 
 	ret = camera_->start();
@@ -126,8 +127,8 @@ int Capture::capture(FrameBufferAllocator *allocator)
 		return ret;
 	}
 
-	for (Request *request : requests) {
-		ret = camera_->queueRequest(request);
+	for (std::unique_ptr<Request> &request : requests_) {
+		ret = camera_->queueRequest(request.get());
 		if (ret < 0) {
 			std::cerr << "Can't queue request" << std::endl;
 			camera_->stop();
@@ -202,22 +203,6 @@ void Capture::requestComplete(Request *request)
 		return;
 	}
 
-	/*
-	 * Create a new request and populate it with one buffer for each
-	 * stream.
-	 */
-	request = camera_->createRequest();
-	if (!request) {
-		std::cerr << "Can't create request" << std::endl;
-		return;
-	}
-
-	for (auto it = buffers.begin(); it != buffers.end(); ++it) {
-		const Stream *stream = it->first;
-		FrameBuffer *buffer = it->second;
-
-		request->addBuffer(stream, buffer);
-	}
-
+	request->reuse(Request::ReuseBuffers);
 	camera_->queueRequest(request);
 }