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, 54 insertions, 0 deletions

diff --git a/src/android/thread_rpc.h b/src/android/thread_rpc.h
new file mode 100644
index 00000000..6d899283
--- /dev/null
+++ b/src/android/thread_rpc.h
@@ -0,0 +1,54 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2019, Google Inc.
+ *
+ * thread_rpc.h - Inter-thread procedure call
+ */
+#ifndef __ANDROID_THREAD_RPC_H__
+#define __ANDROID_THREAD_RPC_H__
+
+#include <condition_variable>
+#include <mutex>
+
+#include <hardware/camera3.h>
+
+#include "message.h"
+#include "thread.h"
+
+class ThreadRpc
+{
+public:
+	enum RpcTag {
+		ProcessCaptureRequest,
+		Close,
+	};
+
+	ThreadRpc()
+		: delivered_(false) {}
+
+	void notifyReception();
+	void waitDelivery();
+
+	RpcTag tag;
+
+	camera3_capture_request_t *request;
+
+private:
+	bool delivered_;
+	std::mutex mutex_;
+	std::condition_variable cv_;
+};
+
+class ThreadRpcMessage : public libcamera::Message
+{
+public:
+	ThreadRpcMessage();
+	ThreadRpc *rpc;
+
+	static Message::Type type();
+
+private:
+	static libcamera::Message::Type rpcType_;
+};
+
+#endif /* __ANDROID_THREAD_RPC_H__ */