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, 42 insertions, 0 deletions

diff --git a/src/android/thread_rpc.cpp b/src/android/thread_rpc.cpp
new file mode 100644
index 00000000..295a05d7
--- /dev/null
+++ b/src/android/thread_rpc.cpp
@@ -0,0 +1,42 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2019, Google Inc.
+ *
+ * thread_rpc.cpp - Inter-thread procedure call
+ */
+
+#include "thread_rpc.h"
+
+#include "message.h"
+
+using namespace libcamera;
+
+libcamera::Message::Type ThreadRpcMessage::rpcType_ = Message::Type::None;
+
+ThreadRpcMessage::ThreadRpcMessage()
+	: Message(type())
+{
+}
+
+void ThreadRpc::notifyReception()
+{
+	{
+		libcamera::MutexLocker locker(mutex_);
+		delivered_ = true;
+	}
+	cv_.notify_one();
+}
+
+void ThreadRpc::waitDelivery()
+{
+	libcamera::MutexLocker locker(mutex_);
+	cv_.wait(locker, [&] { return delivered_; });
+}
+
+Message::Type ThreadRpcMessage::type()
+{
+	if (ThreadRpcMessage::rpcType_ == Message::Type::None)
+		rpcType_ = Message::registerMessageType();
+
+	return rpcType_;
+}