test: v4l2_videodevice: Add M2M device test

The V4L2M2MDevice requires two video devices to be configured. This
makes it unsuitable to reuse the existing V4L2DeviceTest test library in
its current form.

Implement a full test to run the two M2M pipelines through VIM2M.

Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>

test/v4l2_videodevice/v4l2_m2mdevice.cpp

@@ -0,0 +1,212 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2019, Google Inc.
+ *
+ * libcamera V4L2 M2M video device tests
+ */
+
+#include <iostream>
+
+#include <libcamera/buffer.h>
+#include <libcamera/camera_manager.h>
+#include <libcamera/event_dispatcher.h>
+#include <libcamera/timer.h>
+
+#include "device_enumerator.h"
+#include "media_device.h"
+#include "v4l2_videodevice.h"
+
+#include "test.h"
+
+using namespace std;
+using namespace libcamera;
+
+class V4L2M2MDeviceTest : public Test
+{
+public:
+	V4L2M2MDeviceTest()
+		: vim2m_(nullptr), outputFrames_(0), captureFrames_(0)
+	{
+	}
+
+	void outputBufferComplete(Buffer *buffer)
+	{
+		cout << "Received output buffer " << buffer->index() << endl;
+
+		outputFrames_++;
+
+		/* Requeue the buffer for further use. */
+		vim2m_->output()->queueBuffer(buffer);
+	}
+
+	void receiveCaptureBuffer(Buffer *buffer)
+	{
+		cout << "Received capture buffer " << buffer->index() << endl;
+
+		captureFrames_++;
+
+		/* Requeue the buffer for further use. */
+		vim2m_->capture()->queueBuffer(buffer);
+	}
+
+protected:
+	int init()
+	{
+		enumerator_ = DeviceEnumerator::create();
+		if (!enumerator_) {
+			cerr << "Failed to create device enumerator" << endl;
+			return TestFail;
+		}
+
+		if (enumerator_->enumerate()) {
+			cerr << "Failed to enumerate media devices" << endl;
+			return TestFail;
+		}
+
+		DeviceMatch dm("vim2m");
+		dm.add("vim2m-source");
+		dm.add("vim2m-sink");
+
+		media_ = enumerator_->search(dm);
+		if (!media_) {
+			cerr << "No vim2m device found" << endl;
+			return TestSkip;
+		}
+
+		return TestPass;
+	}
+
+	int run()
+	{
+		constexpr unsigned int bufferCount = 4;
+
+		EventDispatcher *dispatcher = CameraManager::instance()->eventDispatcher();
+		int ret;
+
+		MediaEntity *entity = media_->getEntityByName("vim2m-source");
+		vim2m_ = new V4L2M2MDevice(entity->deviceNode());
+		if (vim2m_->open()) {
+			cerr << "Failed to open VIM2M device" << endl;
+			return TestFail;
+		}
+
+		V4L2VideoDevice *capture = vim2m_->capture();
+		V4L2VideoDevice *output = vim2m_->output();
+
+		V4L2DeviceFormat format = {};
+		if (capture->getFormat(&format)) {
+			cerr << "Failed to get capture format" << endl;
+			return TestFail;
+		}
+
+		format.size.width = 640;
+		format.size.height = 480;
+
+		if (capture->setFormat(&format)) {
+			cerr << "Failed to set capture format" << endl;
+			return TestFail;
+		}
+
+		if (output->setFormat(&format)) {
+			cerr << "Failed to set output format" << endl;
+			return TestFail;
+		}
+
+		capturePool_.createBuffers(bufferCount);
+		outputPool_.createBuffers(bufferCount);
+
+		ret = capture->exportBuffers(&capturePool_);
+		if (ret) {
+			cerr << "Failed to export Capture Buffers" << endl;
+			return TestFail;
+		}
+
+		ret = output->exportBuffers(&outputPool_);
+		if (ret) {
+			cerr << "Failed to export Output Buffers" << endl;
+			return TestFail;
+		}
+
+		capture->bufferReady.connect(this, &V4L2M2MDeviceTest::receiveCaptureBuffer);
+		output->bufferReady.connect(this, &V4L2M2MDeviceTest::outputBufferComplete);
+
+		std::vector<std::unique_ptr<Buffer>> captureBuffers;
+		captureBuffers = capture->queueAllBuffers();
+		if (captureBuffers.empty()) {
+			cerr << "Failed to queue all Capture Buffers" << endl;
+			return TestFail;
+		}
+
+		/* We can't "queueAllBuffers()" on an output device, so we do it manually */
+		std::vector<std::unique_ptr<Buffer>> outputBuffers;
+		for (unsigned int i = 0; i < outputPool_.count(); ++i) {
+			Buffer *buffer = new Buffer(i);
+			outputBuffers.emplace_back(buffer);
+			ret = output->queueBuffer(buffer);
+			if (ret) {
+				cerr << "Failed to queue output buffer" << i << endl;
+				return TestFail;
+			}
+		}
+
+		ret = capture->streamOn();
+		if (ret) {
+			cerr << "Failed to streamOn capture" << endl;
+			return TestFail;
+		}
+
+		ret = output->streamOn();
+		if (ret) {
+			cerr << "Failed to streamOn output" << endl;
+			return TestFail;
+		}
+
+		Timer timeout;
+		timeout.start(5000);
+		while (timeout.isRunning()) {
+			dispatcher->processEvents();
+			if (captureFrames_ > 30)
+				break;
+		}
+
+		cerr << "Output " << outputFrames_ << " frames" << std::endl;
+		cerr << "Captured " << captureFrames_ << " frames" << std::endl;
+
+		if (captureFrames_ < 30) {
+			cerr << "Failed to capture 30 frames within timeout." << std::endl;
+			return TestFail;
+		}
+
+		ret = capture->streamOff();
+		if (ret) {
+			cerr << "Failed to StreamOff the capture device." << std::endl;
+			return TestFail;
+		}
+
+		ret = output->streamOff();
+		if (ret) {
+			cerr << "Failed to StreamOff the output device." << std::endl;
+			return TestFail;
+		}
+
+		return TestPass;
+	}
+
+	void cleanup()
+	{
+		delete vim2m_;
+	};
+
+private:
+	std::unique_ptr<DeviceEnumerator> enumerator_;
+	std::shared_ptr<MediaDevice> media_;
+	V4L2M2MDevice *vim2m_;
+
+	BufferPool capturePool_;
+	BufferPool outputPool_;
+
+	unsigned int outputFrames_;
+	unsigned int captureFrames_;
+};
+
+TEST_REGISTER(V4L2M2MDeviceTest);