qcam: Allow for a second raw stream to be configured

Allow a second stream to be configured for raw capture. This change only
adds support for configuring and allocating buffers for the second
stream. Later changes are needed to queue the allocated buffers to the
camera when the user wishes to capture a raw frame.

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

src/qcam/main_window.cpp

@@ -281,18 +281,31 @@ void MainWindow::toggleCapture(bool start)
 int MainWindow::startCapture()
 {
 	StreamRoles roles = StreamKeyValueParser::roles(options_[OptStream]);
+	std::vector<Request *> requests;
 	int ret;
 
 	/* Verify roles are supported. */
-	if (roles.size() != 1) {
-		qCritical() << "Only one stream supported";
+	switch (roles.size()) {
+	case 1:
+		if (roles[0] != StreamRole::Viewfinder) {
+			qWarning() << "Only viewfinder supported for single stream";
 			return -EINVAL;
 		}
-
-	if (roles[0] != StreamRole::Viewfinder) {
-		qCritical() << "Only viewfinder supported";
+		break;
+	case 2:
+		if (roles[0] != StreamRole::Viewfinder ||
+		    roles[1] != StreamRole::StillCaptureRaw) {
+			qWarning() << "Only viewfinder + raw supported for dual streams";
 			return -EINVAL;
 		}
+		break;
+	default:
+		if (roles.size() != 1) {
+			qWarning() << "Unsuported stream configuration";
+			return -EINVAL;
+		}
+		break;
+	}
 
 	/* Configure the camera. */
 	config_ = camera_->generateConfiguration(roles);
@@ -301,17 +314,17 @@ int MainWindow::startCapture()
 		return -EINVAL;
 	}
 
-	StreamConfiguration &cfg = config_->at(0);
+	StreamConfiguration &vfConfig = config_->at(0);
 
 	/* Use a format supported by the viewfinder if available. */
-	std::vector<PixelFormat> formats = cfg.formats().pixelformats();
+	std::vector<PixelFormat> formats = vfConfig.formats().pixelformats();
 	for (const PixelFormat &format : viewfinder_->nativeFormats()) {
 		auto match = std::find_if(formats.begin(), formats.end(),
 					  [&](const PixelFormat &f) {
 						  return f == format;
 					  });
 		if (match != formats.end()) {
-			cfg.pixelFormat = format;
+			vfConfig.pixelFormat = format;
 			break;
 		}
 	}
@@ -331,7 +344,7 @@ int MainWindow::startCapture()
 
 	if (validation == CameraConfiguration::Adjusted)
 		qInfo() << "Stream configuration adjusted to "
-			<< cfg.toString().c_str();
+			<< vfConfig.toString().c_str();
 
 	ret = camera_->configure(config_.get());
 	if (ret < 0) {
@@ -339,10 +352,16 @@ int MainWindow::startCapture()
 		return ret;
 	}
 
+	/* Store stream allocation. */
+	vfStream_ = config_->at(0).stream();
+	if (config_->size() == 2)
+		rawStream_ = config_->at(1).stream();
+	else
+		rawStream_ = nullptr;
+
 	/* Configure the viewfinder. */
-	Stream *stream = cfg.stream();
-	ret = viewfinder_->setFormat(cfg.pixelFormat,
-				     QSize(cfg.size.width, cfg.size.height));
+	ret = viewfinder_->setFormat(vfConfig.pixelFormat,
+				     QSize(vfConfig.size.width, vfConfig.size.height));
 	if (ret < 0) {
 		qInfo() << "Failed to set viewfinder format";
 		return ret;
@@ -350,16 +369,33 @@ int MainWindow::startCapture()
 
 	adjustSize();
 
-	/* Allocate buffers and requests. */
+	/* Allocate and map buffers. */
 	allocator_ = new FrameBufferAllocator(camera_);
+	for (StreamConfiguration &config : *config_) {
+		Stream *stream = config.stream();
+
 		ret = allocator_->allocate(stream);
 		if (ret < 0) {
 			qWarning() << "Failed to allocate capture buffers";
-		return ret;
+			goto error;
 		}
 
-	std::vector<Request *> requests;
 		for (const std::unique_ptr<FrameBuffer> &buffer : allocator_->buffers(stream)) {
+			/* Map memory buffers and cache the mappings. */
+			const FrameBuffer::Plane &plane = buffer->planes().front();
+			void *memory = mmap(NULL, plane.length, PROT_READ, MAP_SHARED,
+					    plane.fd.fd(), 0);
+			mappedBuffers_[buffer.get()] = { memory, plane.length };
+
+			/* Store buffers on the free list. */
+			freeBuffers_[stream].enqueue(buffer.get());
+		}
+	}
+
+	/* Create requests and fill them with buffers from the viewfinder. */
+	while (!freeBuffers_[vfStream_].isEmpty()) {
+		FrameBuffer *buffer = freeBuffers_[vfStream_].dequeue();
+
 		Request *request = camera_->createRequest();
 		if (!request) {
 			qWarning() << "Can't create request";
@@ -367,19 +403,13 @@ int MainWindow::startCapture()
 			goto error;
 		}
 
-		ret = request->addBuffer(stream, buffer.get());
+		ret = request->addBuffer(vfStream_, buffer);
 		if (ret < 0) {
 			qWarning() << "Can't set buffer for request";
 			goto error;
 		}
 
 		requests.push_back(request);
-
-		/* Map memory buffers and cache the mappings. */
-		const FrameBuffer::Plane &plane = buffer->planes().front();
-		void *memory = mmap(NULL, plane.length, PROT_READ, MAP_SHARED,
-				    plane.fd.fd(), 0);
-		mappedBuffers_[buffer.get()] = { memory, plane.length };
 	}
 
 	/* Start the title timer and the camera. */
@@ -424,6 +454,8 @@ error:
 	}
 	mappedBuffers_.clear();
 
+	freeBuffers_.clear();
+
 	delete allocator_;
 	allocator_ = nullptr;
 
@@ -466,6 +498,7 @@ void MainWindow::stopCapture()
 	 * but not processed yet. Clear the queue of done buffers to avoid
 	 * racing with the event handler.
 	 */
+	freeBuffers_.clear();
 	doneQueue_.clear();
 
 	titleTimer_.stop();
@@ -505,12 +538,9 @@ void MainWindow::requestComplete(Request *request)
 	 * are not allowed. Add the buffer to the done queue and post a
 	 * CaptureEvent for the application thread to handle.
 	 */
-	const std::map<Stream *, FrameBuffer *> &buffers = request->buffers();
-	FrameBuffer *buffer = buffers.begin()->second;
-
 	{
 		QMutexLocker locker(&mutex_);
-		doneQueue_.enqueue(buffer);
+		doneQueue_.enqueue(request->buffers());
 	}
 
 	QCoreApplication::postEvent(this, new CaptureEvent);
@@ -523,16 +553,23 @@ void MainWindow::processCapture()
 	 * if stopCapture() has been called while a CaptureEvent was posted but
 	 * not processed yet. Return immediately in that case.
 	 */
-	FrameBuffer *buffer;
+	std::map<Stream *, FrameBuffer *> buffers;
 
 	{
 		QMutexLocker locker(&mutex_);
 		if (doneQueue_.isEmpty())
 			return;
 
-		buffer = doneQueue_.dequeue();
+		buffers = doneQueue_.dequeue();
 	}
 
+	/* Process buffers. */
+	if (buffers.count(vfStream_))
+		processViewfinder(buffers[vfStream_]);
+}
+
+void MainWindow::processViewfinder(FrameBuffer *buffer)
+{
 	framesCaptured_++;
 
 	const FrameMetadata &metadata = buffer->metadata();
@@ -559,8 +596,7 @@ void MainWindow::queueRequest(FrameBuffer *buffer)
 		return;
 	}
 
-	Stream *stream = config_->at(0).stream();
-	request->addBuffer(stream, buffer);
+	request->addBuffer(vfStream_, buffer);
 
 	camera_->queueRequest(request);
 }

src/qcam/main_window.h

@@ -69,6 +69,7 @@ private:
 
 	void requestComplete(Request *request);
 	void processCapture();
+	void processViewfinder(FrameBuffer *buffer);
 
 	/* UI elements */
 	QToolBar *toolbar_;
@@ -95,8 +96,11 @@ private:
 
 	/* Capture state, buffers queue and statistics */
 	bool isCapturing_;
-	QQueue<FrameBuffer *> doneQueue_;
-	QMutex mutex_;	/* Protects doneQueue_ */
+	Stream *vfStream_;
+	Stream *rawStream_;
+	std::map<Stream *, QQueue<FrameBuffer *>> freeBuffers_;
+	QQueue<std::map<Stream *, FrameBuffer *>> doneQueue_;
+	QMutex mutex_; /* Protects freeBuffers_ and doneQueue_ */
 
 	uint64_t lastBufferTime_;
 	QElapsedTimer frameRateInterval_;