initial commit, 4.5 stable

platform/web/audio_driver_web.h

@@ -0,0 +1,192 @@
+/**************************************************************************/
+/*  audio_driver_web.h                                                    */
+/**************************************************************************/
+/*                         This file is part of:                          */
+/*                             GODOT ENGINE                               */
+/*                        https://godotengine.org                         */
+/**************************************************************************/
+/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
+/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
+/*                                                                        */
+/* Permission is hereby granted, free of charge, to any person obtaining  */
+/* a copy of this software and associated documentation files (the        */
+/* "Software"), to deal in the Software without restriction, including    */
+/* without limitation the rights to use, copy, modify, merge, publish,    */
+/* distribute, sublicense, and/or sell copies of the Software, and to     */
+/* permit persons to whom the Software is furnished to do so, subject to  */
+/* the following conditions:                                              */
+/*                                                                        */
+/* The above copyright notice and this permission notice shall be         */
+/* included in all copies or substantial portions of the Software.        */
+/*                                                                        */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,        */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF     */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY   */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,   */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE      */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                 */
+/**************************************************************************/
+
+#pragma once
+
+#include "godot_audio.h"
+#include "godot_js.h"
+
+#include "core/os/mutex.h"
+#include "core/os/thread.h"
+#include "servers/audio_server.h"
+
+class AudioDriverWeb : public AudioDriver {
+private:
+	struct AudioContext {
+		bool inited = false;
+		float output_latency = 0.0;
+		int state = -1;
+		int channel_count = 0;
+		int mix_rate = 0;
+	};
+	static AudioContext audio_context;
+
+	float *output_rb = nullptr;
+	float *input_rb = nullptr;
+
+	int buffer_length = 0;
+	int mix_rate = 0;
+	int channel_count = 0;
+
+	WASM_EXPORT static void _state_change_callback(int p_state);
+	WASM_EXPORT static void _latency_update_callback(float p_latency);
+	WASM_EXPORT static void _sample_playback_finished_callback(const char *p_playback_object_id);
+
+	static AudioDriverWeb *singleton;
+
+protected:
+	void _audio_driver_process(int p_from = 0, int p_samples = 0);
+	void _audio_driver_capture(int p_from = 0, int p_samples = 0);
+	float *get_output_rb() const { return output_rb; }
+	float *get_input_rb() const { return input_rb; }
+
+	virtual Error create(int &p_buffer_samples, int p_channels) = 0;
+	virtual void start(float *p_out_buf, int p_out_buf_size, float *p_in_buf, int p_in_buf_size) = 0;
+	virtual void finish_driver() {}
+
+public:
+	static bool is_available();
+
+	virtual Error init() final;
+	virtual void start() final;
+	virtual void finish() final;
+
+	virtual int get_mix_rate() const override;
+	virtual SpeakerMode get_speaker_mode() const override;
+	virtual float get_latency() override;
+
+	virtual Error input_start() override;
+	virtual Error input_stop() override;
+
+	static void resume();
+
+	// Samples.
+	virtual bool is_stream_registered_as_sample(const Ref<AudioStream> &p_stream) const override;
+	virtual void register_sample(const Ref<AudioSample> &p_sample) override;
+	virtual void unregister_sample(const Ref<AudioSample> &p_sample) override;
+	virtual void start_sample_playback(const Ref<AudioSamplePlayback> &p_playback) override;
+	virtual void stop_sample_playback(const Ref<AudioSamplePlayback> &p_playback) override;
+	virtual void set_sample_playback_pause(const Ref<AudioSamplePlayback> &p_playback, bool p_paused) override;
+	virtual bool is_sample_playback_active(const Ref<AudioSamplePlayback> &p_playback) override;
+	virtual double get_sample_playback_position(const Ref<AudioSamplePlayback> &p_playback) override;
+	virtual void update_sample_playback_pitch_scale(const Ref<AudioSamplePlayback> &p_playback, float p_pitch_scale = 0.0f) override;
+	virtual void set_sample_playback_bus_volumes_linear(const Ref<AudioSamplePlayback> &p_playback, const HashMap<StringName, Vector<AudioFrame>> &p_bus_volumes) override;
+
+	virtual void set_sample_bus_count(int p_count) override;
+	virtual void remove_sample_bus(int p_index) override;
+	virtual void add_sample_bus(int p_at_pos = -1) override;
+	virtual void move_sample_bus(int p_bus, int p_to_pos) override;
+	virtual void set_sample_bus_send(int p_bus, const StringName &p_send) override;
+	virtual void set_sample_bus_volume_db(int p_bus, float p_volume_db) override;
+	virtual void set_sample_bus_solo(int p_bus, bool p_enable) override;
+	virtual void set_sample_bus_mute(int p_bus, bool p_enable) override;
+
+	AudioDriverWeb() {}
+};
+
+#ifdef THREADS_ENABLED
+class AudioDriverWorklet : public AudioDriverWeb {
+private:
+	enum {
+		STATE_LOCK,
+		STATE_PROCESS,
+		STATE_SAMPLES_IN,
+		STATE_SAMPLES_OUT,
+		STATE_MAX,
+	};
+	Mutex mutex;
+	Thread thread;
+	bool quit = false;
+	int32_t state[STATE_MAX] = { 0 };
+
+	static void _audio_thread_func(void *p_data);
+
+protected:
+	virtual Error create(int &p_buffer_size, int p_output_channels) override;
+	virtual void start(float *p_out_buf, int p_out_buf_size, float *p_in_buf, int p_in_buf_size) override;
+	virtual void finish_driver() override;
+
+public:
+	virtual const char *get_name() const override {
+		return "AudioWorklet";
+	}
+
+	virtual void lock() override;
+	virtual void unlock() override;
+};
+
+#else
+
+class AudioDriverWorklet : public AudioDriverWeb {
+private:
+	static void _process_callback(int p_pos, int p_samples);
+	static void _capture_callback(int p_pos, int p_samples);
+
+	static AudioDriverWorklet *singleton;
+
+protected:
+	virtual Error create(int &p_buffer_size, int p_output_channels) override;
+	virtual void start(float *p_out_buf, int p_out_buf_size, float *p_in_buf, int p_in_buf_size) override;
+
+public:
+	virtual const char *get_name() const override {
+		return "AudioWorklet";
+	}
+
+	virtual void lock() override {}
+	virtual void unlock() override {}
+
+	static AudioDriverWorklet *get_singleton() { return singleton; }
+
+	AudioDriverWorklet() { singleton = this; }
+};
+
+#endif // THREADS_ENABLED
+
+class AudioDriverScriptProcessor : public AudioDriverWeb {
+private:
+	static void _process_callback();
+
+	static AudioDriverScriptProcessor *singleton;
+
+protected:
+	virtual Error create(int &p_buffer_size, int p_output_channels) override;
+	virtual void start(float *p_out_buf, int p_out_buf_size, float *p_in_buf, int p_in_buf_size) override;
+
+public:
+	virtual const char *get_name() const override { return "ScriptProcessor"; }
+
+	virtual void lock() override {}
+	virtual void unlock() override {}
+
+	static AudioDriverScriptProcessor *get_singleton() { return singleton; }
+
+	AudioDriverScriptProcessor() { singleton = this; }
+};