[libcamera-devel] [PATCH] test: v4l2_videodevice: Verify the Dequeue Watchdog

[Kieran Bingham]

Add a test that captures 5 frames, with a short (5ms) watchdog.
The default framerate of the VIMC pipeline should ensure that
we never meet this watchdog, and the timeout should activate.

Signed-off-by: Kieran Bingham <kieran.bingham at ideasonboard.com>
---
 test/v4l2_videodevice/dequeue_watchdog.cpp | 100 +++++++++++++++++++++
 test/v4l2_videodevice/meson.build          |   1 +
 2 files changed, 101 insertions(+)
 create mode 100644 test/v4l2_videodevice/dequeue_watchdog.cpp

diff --git a/test/v4l2_videodevice/dequeue_watchdog.cpp b/test/v4l2_videodevice/dequeue_watchdog.cpp
new file mode 100644
index 000000000000..db0c65ff482e
--- /dev/null
+++ b/test/v4l2_videodevice/dequeue_watchdog.cpp
@@ -0,0 +1,100 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2022, Ideas on Board Oy.
+ *
+ * libcamera V4L2 dequeue watchdog test
+ */
+
+#include <iostream>
+
+#include <libcamera/base/event_dispatcher.h>
+#include <libcamera/base/thread.h>
+#include <libcamera/base/timer.h>
+
+#include <libcamera/framebuffer.h>
+
+#include "v4l2_videodevice_test.h"
+
+using namespace std::chrono_literals;
+using namespace libcamera;
+
+class DequeueWatchdogTest : public V4L2VideoDeviceTest
+{
+public:
+	DequeueWatchdogTest()
+		: V4L2VideoDeviceTest("vimc", "Raw Capture 0"), frames(0), barks(0) {}
+
+	void receiveBuffer(FrameBuffer *buffer)
+	{
+		if (buffer->metadata().status == FrameMetadata::FrameCancelled)
+			return;
+
+		std::cout << "Buffer received" << std::endl;
+		frames++;
+
+		/* Requeue the buffer for further use. */
+		capture_->queueBuffer(buffer);
+	}
+
+	void barkCounter()
+	{
+		std::cout << "Watchdog is barking" << std::endl;
+		barks++;
+	}
+
+protected:
+	int run()
+	{
+		const unsigned int bufferCount = 8;
+
+		EventDispatcher *dispatcher = Thread::current()->eventDispatcher();
+		Timer timeout;
+
+		int ret = capture_->allocateBuffers(bufferCount, &buffers_);
+		if (ret < 0)
+			return TestFail;
+
+		capture_->dequeueTimeout.connect(this, &DequeueWatchdogTest::barkCounter);
+		capture_->setDequeueTimeout(5ms);
+
+		capture_->bufferReady.connect(this, &DequeueWatchdogTest::receiveBuffer);
+
+		for (const std::unique_ptr<FrameBuffer> &buffer : buffers_) {
+			if (capture_->queueBuffer(buffer.get())) {
+				std::cout << "Failed to queue buffer" << std::endl;
+				return TestFail;
+			}
+		}
+
+		ret = capture_->streamOn();
+		if (ret)
+			return TestFail;
+
+		timeout.start(5s);
+		while (timeout.isRunning()) {
+			dispatcher->processEvents();
+			if (frames > 5)
+				break;
+		}
+
+		std::cout << "Processed " << frames << " frames and heard "
+			  << barks << " barks" << std::endl;
+
+		if (barks < 1) {
+			std::cout << "Failed to hear any barks." << std::endl;
+			return TestFail;
+		}
+
+		ret = capture_->streamOff();
+		if (ret)
+			return TestFail;
+
+		return TestPass;
+	}
+
+private:
+	unsigned int frames;
+	unsigned int barks;
+};
+
+TEST_REGISTER(DequeueWatchdogTest)
diff --git a/test/v4l2_videodevice/meson.build b/test/v4l2_videodevice/meson.build
index 643f82edce5e..7a26f53d106a 100644
--- a/test/v4l2_videodevice/meson.build
+++ b/test/v4l2_videodevice/meson.build
@@ -6,6 +6,7 @@ v4l2_videodevice_tests = [
     ['double_open',         'double_open.cpp'],
     ['controls',            'controls.cpp'],
     ['formats',             'formats.cpp'],
+    ['dequeue_watchdog',    'dequeue_watchdog.cpp'],
     ['request_buffers',     'request_buffers.cpp'],
     ['buffer_cache',        'buffer_cache.cpp'],
     ['stream_on_off',       'stream_on_off.cpp'],
-- 
2.32.0