Add Chromium-only Blender WebEngine parity work

blender-5.2.0/extern/audaspace/plugins/pipewire/PipeWireDevice.h

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+/*******************************************************************************
+ * Copyright 2009-2024 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
+
+#ifdef PIPEWIRE_PLUGIN
+#define AUD_BUILD_PLUGIN
+#endif
+
+/**
+ * @file PipeWireDevice.h
+ * @ingroup plugin
+ * The PipeWireDevice class.
+ */
+
+#include <pipewire/pipewire.h>
+
+#include "devices/MixingThreadDevice.h"
+
+AUD_NAMESPACE_BEGIN
+
+/**
+ * This device plays back through PipeWire, the simple direct media layer.
+ */
+class AUD_PLUGIN_API PipeWireDevice : public MixingThreadDevice
+{
+private:
+	pw_stream* m_stream;
+	pw_thread_loop* m_thread;
+	std::unique_ptr<pw_stream_events> m_events;
+	bool m_active{false};
+
+	/// Synchronizer.
+	bool m_getSynchronizerStartTime{false};
+	int64_t m_synchronizerStartTime{0};
+	double m_synchronizerStartPosition{0.0};
+
+	AUD_LOCAL static void handleStateChanged(void* device_ptr, enum pw_stream_state old, enum pw_stream_state state, const char* error);
+
+	/**
+	 * Mixes the next bytes into the buffer.
+	 * \param data The PipeWire device.
+	 */
+	AUD_LOCAL static void mixAudioBuffer(void* device_ptr);
+
+	// delete copy constructor and operator=
+	PipeWireDevice(const PipeWireDevice&) = delete;
+	PipeWireDevice& operator=(const PipeWireDevice&) = delete;
+
+protected:
+	void preMixingWork(bool playing);
+	virtual void playing(bool playing);
+
+public:
+	/**
+	 * Opens the PipeWire audio device for playback.
+	 * \param specs The wanted audio specification.
+	 * \param buffersize The size of the internal buffer.
+	 * \note The specification really used for opening the device may differ.
+	 * \exception Exception Thrown if the audio device cannot be opened.
+	 */
+	PipeWireDevice(const std::string& name, DeviceSpecs specs, int buffersize = AUD_DEFAULT_BUFFER_SIZE);
+
+	/**
+	 * Closes the PipeWire audio device.
+	 */
+	virtual ~PipeWireDevice();
+
+	virtual void seekSynchronizer(double time);
+	virtual double getSynchronizerPosition();
+	virtual void playSynchronizer();
+	virtual void stopSynchronizer();
+
+	/**
+	 * Registers this plugin.
+	 */
+	static void registerPlugin();
+};
+
+AUD_NAMESPACE_END