Add Chromium-only Blender WebEngine parity work

blender-5.2.0/extern/audaspace/plugins/pulseaudio/PulseAudioDevice.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
+
+#ifdef PULSEAUDIO_PLUGIN
+#define AUD_BUILD_PLUGIN
+#endif
+
+/**
+ * @file PulseAudioDevice.h
+ * @ingroup plugin
+ * The PulseAudioDevice class.
+ */
+
+#include <pulse/pulseaudio.h>
+
+#include "devices/MixingThreadDevice.h"
+
+AUD_NAMESPACE_BEGIN
+
+/**
+ * This device plays back through PulseAudio, the simple direct media layer.
+ */
+class AUD_PLUGIN_API PulseAudioDevice : public MixingThreadDevice
+{
+private:
+	bool m_corked;
+
+	pa_threaded_mainloop* m_mainloop;
+	pa_context* m_context;
+	pa_stream* m_stream;
+	pa_context_state_t m_state;
+
+	int m_buffersize;
+	uint32_t m_underflows;
+
+	/// Synchronizer.
+	pa_usec_t m_synchronizerStartTime{0};
+	double m_synchronizerStartPosition{0.0};
+
+	AUD_LOCAL void preMixingWork(bool playing) override;
+
+	/**
+	 * Reports the state of the PulseAudio server connection.
+	 * \param context The PulseAudio context.
+	 * \param data The PulseAudio device.
+	 */
+	AUD_LOCAL static void PulseAudio_state_callback(pa_context* context, void* data);
+
+	/**
+	 * Supplies the next samples to PulseAudio.
+	 * \param stream The PulseAudio stream.
+	 * \param num_bytes The length in bytes to be supplied.
+	 * \param data The PulseAudio device.
+	 */
+	AUD_LOCAL static void PulseAudio_request(pa_stream* stream, size_t total_bytes, void* data);
+
+	// delete copy constructor and operator=
+	PulseAudioDevice(const PulseAudioDevice&) = delete;
+	PulseAudioDevice& operator=(const PulseAudioDevice&) = delete;
+
+protected:
+	virtual void playing(bool playing);
+
+public:
+	/**
+	 * Opens the PulseAudio 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.
+	 */
+	PulseAudioDevice(const std::string &name, DeviceSpecs specs, int buffersize = AUD_DEFAULT_BUFFER_SIZE);
+
+	/**
+	 * Closes the PulseAudio audio device.
+	 */
+	virtual ~PulseAudioDevice();
+
+	virtual void seekSynchronizer(double time);
+	virtual double getSynchronizerPosition();
+	virtual void playSynchronizer();
+	virtual void stopSynchronizer();
+
+	/**
+	 * Registers this plugin.
+	 */
+	static void registerPlugin();
+};
+
+AUD_NAMESPACE_END