android: hal: Add Camera3 HAL

Add libcamera Android Camera HALv3 implementation.

The initial camera HAL implementation supports the LIMITED hardware
level and uses statically defined metadata and camera characteristics.

Add a build option named 'android' and adjust the build system to
selectively compile the Android camera HAL and link it against the
required Android libraries.

Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>

1 files changed, 71 insertions, 0 deletions

diff --git a/src/android/camera_device.h b/src/android/camera_device.h
new file mode 100644
index 00000000..ac5b95c9
--- /dev/null
+++ b/src/android/camera_device.h
@@ -0,0 +1,71 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2019, Google Inc.
+ *
+ * camera_device.h - libcamera Android Camera Device
+ */
+#ifndef __ANDROID_CAMERA_DEVICE_H__
+#define __ANDROID_CAMERA_DEVICE_H__
+
+#include <memory>
+
+#include <hardware/camera3.h>
+
+#include <libcamera/buffer.h>
+#include <libcamera/camera.h>
+#include <libcamera/object.h>
+#include <libcamera/request.h>
+#include <libcamera/stream.h>
+
+#include "message.h"
+
+#define METADATA_ASSERT(_r)		\
+	do {				\
+		if (!(_r)) break;	\
+		LOG(HAL, Error) << "Error: " << __func__ << ":" << __LINE__; \
+		return nullptr;		\
+	} while(0);
+
+class CameraDevice : public libcamera::Object
+{
+public:
+	CameraDevice(unsigned int id, std::shared_ptr<libcamera::Camera> &camera);
+	~CameraDevice();
+
+	void message(libcamera::Message *message);
+
+	int open();
+	void close();
+	void setCallbacks(const camera3_callback_ops_t *callbacks);
+	camera_metadata_t *getStaticMetadata();
+	const camera_metadata_t *constructDefaultRequestSettings(int type);
+	int configureStreams(camera3_stream_configuration_t *stream_list);
+	int processCaptureRequest(camera3_capture_request_t *request);
+	void requestComplete(libcamera::Request *request,
+			     const std::map<libcamera::Stream *, libcamera::Buffer *> &buffers);
+
+private:
+	struct Camera3RequestDescriptor {
+		Camera3RequestDescriptor(unsigned int frameNumber,
+					 unsigned int numBuffers);
+		~Camera3RequestDescriptor();
+
+		uint32_t frameNumber;
+		uint32_t numBuffers;
+		camera3_stream_buffer_t *buffers;
+	};
+
+	void notifyShutter(uint32_t frameNumber, uint64_t timestamp);
+	void notifyError(uint32_t frameNumber, camera3_stream_t *stream);
+	camera_metadata_t *getResultMetadata(int frame_number, int64_t timestamp);
+
+	bool running_;
+	std::shared_ptr<libcamera::Camera> camera_;
+	std::unique_ptr<libcamera::CameraConfiguration> config_;
+
+	camera_metadata_t *staticMetadata_;
+	camera_metadata_t *requestTemplate_;
+	const camera3_callback_ops_t *callbacks_;
+};
+
+#endif /* __ANDROID_CAMERA_DEVICE_H__ */