Add Chromium-only Blender WebEngine parity work

blender-5.2.0/extern/audaspace/include/devices/MixingThreadDevice.h

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+/*******************************************************************************
+ * Copyright 2009-2016 Jörg Müller
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ ******************************************************************************/
+
+#pragma once
+
+/**
+ * @file MixingThreadDevice.h
+ * @ingroup device
+ * The MixingThreadDevice class.
+ */
+
+#include <condition_variable>
+#include <thread>
+
+#include "devices/SoftwareDevice.h"
+#include "util/RingBuffer.h"
+
+AUD_NAMESPACE_BEGIN
+
+/**
+ * This device extends the SoftwareDevice with code for running mixing in a separate thread.
+ */
+class AUD_PLUGIN_API MixingThreadDevice : public SoftwareDevice
+{
+private:
+	/**
+	 * Whether there is currently playback.
+	 */
+	volatile bool m_playback{false};
+
+	/**
+	 * The deinterleaving buffer.
+	 */
+	Buffer m_mixingBuffer;
+
+	/**
+	 * The mixing ring buffer.
+	 */
+	RingBuffer m_ringBuffer;
+
+	/**
+	 * Whether the device is valid.
+	 */
+	bool m_valid{false};
+
+	/**
+	 * The mixing thread.
+	 */
+	std::thread m_mixingThread;
+
+	/**
+	 * Mutex for mixing.
+	 */
+	std::mutex m_mixingLock;
+
+	/**
+	 * Condition for mixing.
+	 */
+	std::condition_variable m_mixingCondition;
+
+	/**
+	 * Updates the ring buffer.
+	 */
+	AUD_LOCAL void updateRingBuffer();
+
+	// delete copy constructor and operator=
+	MixingThreadDevice(const MixingThreadDevice&) = delete;
+	MixingThreadDevice& operator=(const MixingThreadDevice&) = delete;
+
+protected:
+	/**
+	 * Starts the streaming thread.
+	 * @param buffersize Size of the ring buffer in bytes.
+	 */
+	void startMixingThread(size_t buffersize);
+
+	/**
+	 * Notify the mixing thread.
+	 */
+	void notifyMixingThread();
+
+	/**
+	 * Get ring buffer for reading.
+	 */
+	inline RingBuffer& getRingBuffer()
+	{
+		return m_ringBuffer;
+	}
+
+	/**
+	 * Returns whether the thread is running or not.
+	 */
+	inline bool isMixingThreadRunning()
+	{
+		return m_valid;
+	}
+
+	virtual void playing(bool playing);
+
+	/**
+	 * Called every iteration in the mixing thread before mixing.
+	 */
+	virtual void preMixingWork(bool playing);
+
+	/**
+	 * Empty default constructor. To setup the device call the function create()
+	 * and to uninitialize call destroy().
+	 */
+	MixingThreadDevice();
+
+	/**
+	 * Stops all playback and notifies the mixing thread to stop.
+	 * \warning The device has to be unlocked to not run into a deadlock.
+	 */
+	void stopMixingThread();
+};
+
+AUD_NAMESPACE_END