android: Remove internal thread

Now that libcamera creates threads internally and doesn't rely on an
application-provided event loop, remove the thread from the Android
Camera HAL layer. The CameraProxy class becomes meaningless, remove it
and communicate directly from the CameraHalManager to the CameraDevice.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Jacopo Mondi <jacopo@jmondi.org>

src/android/camera_ops.cpp

@@ -0,0 +1,96 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2019, Google Inc.
+ *
+ * camera_ops.h - Android Camera HAL Operations
+ */
+
+#include "camera_ops.h"
+
+#include <system/camera_metadata.h>
+
+#include "camera_device.h"
+
+using namespace libcamera;
+
+/*
+ * Translatation layer between the Android Camera HAL device operations and the
+ * CameraDevice.
+ */
+
+static int hal_dev_initialize(const struct camera3_device *dev,
+			      const camera3_callback_ops_t *callback_ops)
+{
+	if (!dev)
+		return -EINVAL;
+
+	CameraDevice *camera = reinterpret_cast<CameraDevice *>(dev->priv);
+	camera->setCallbacks(callback_ops);
+
+	return 0;
+}
+
+static int hal_dev_configure_streams(const struct camera3_device *dev,
+				     camera3_stream_configuration_t *stream_list)
+{
+	if (!dev)
+		return -EINVAL;
+
+	CameraDevice *camera = reinterpret_cast<CameraDevice *>(dev->priv);
+	return camera->configureStreams(stream_list);
+}
+
+static const camera_metadata_t *
+hal_dev_construct_default_request_settings(const struct camera3_device *dev,
+					   int type)
+{
+	if (!dev)
+		return nullptr;
+
+	CameraDevice *camera = reinterpret_cast<CameraDevice *>(dev->priv);
+	return camera->constructDefaultRequestSettings(type);
+}
+
+static int hal_dev_process_capture_request(const struct camera3_device *dev,
+					   camera3_capture_request_t *request)
+{
+	if (!dev)
+		return -EINVAL;
+
+	CameraDevice *camera = reinterpret_cast<CameraDevice *>(dev->priv);
+	return camera->processCaptureRequest(request);
+}
+
+static void hal_dev_dump(const struct camera3_device *dev, int fd)
+{
+}
+
+static int hal_dev_flush(const struct camera3_device *dev)
+{
+	return 0;
+}
+
+int hal_dev_close(hw_device_t *hw_device)
+{
+	if (!hw_device)
+		return -EINVAL;
+
+	camera3_device_t *dev = reinterpret_cast<camera3_device_t *>(hw_device);
+	CameraDevice *camera = reinterpret_cast<CameraDevice *>(dev->priv);
+
+	camera->close();
+
+	return 0;
+}
+
+camera3_device_ops hal_dev_ops = {
+	.initialize = hal_dev_initialize,
+	.configure_streams = hal_dev_configure_streams,
+	.register_stream_buffers = nullptr,
+	.construct_default_request_settings = hal_dev_construct_default_request_settings,
+	.process_capture_request = hal_dev_process_capture_request,
+	.get_metadata_vendor_tag_ops = nullptr,
+	.dump = hal_dev_dump,
+	.flush = hal_dev_flush,
+	.reserved = { nullptr },
+};