initial commit, 4.5 stable

modules/interactive_music/audio_stream_synchronized.h

@@ -0,0 +1,119 @@
+/**************************************************************************/
+/*  audio_stream_synchronized.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 "servers/audio/audio_stream.h"
+
+class AudioStreamPlaybackSynchronized;
+
+class AudioStreamSynchronized : public AudioStream {
+	GDCLASS(AudioStreamSynchronized, AudioStream)
+	OBJ_SAVE_TYPE(AudioStream)
+
+private:
+	friend class AudioStreamPlaybackSynchronized;
+
+	enum {
+		MAX_STREAMS = 32
+	};
+
+	int stream_count = 0;
+	Ref<AudioStream> audio_streams[MAX_STREAMS];
+	float audio_stream_volume_db[MAX_STREAMS] = {};
+	HashSet<AudioStreamPlaybackSynchronized *> playbacks;
+
+public:
+	virtual double get_bpm() const override;
+	virtual int get_beat_count() const override;
+	virtual int get_bar_beats() const override;
+	virtual bool has_loop() const override;
+	void set_stream_count(int p_count);
+	int get_stream_count() const;
+	void set_sync_stream(int p_stream_index, Ref<AudioStream> p_stream);
+	Ref<AudioStream> get_sync_stream(int p_stream_index) const;
+	void set_sync_stream_volume(int p_stream_index, float p_db);
+	float get_sync_stream_volume(int p_stream_index) const;
+
+	virtual Ref<AudioStreamPlayback> instantiate_playback() override;
+	virtual String get_stream_name() const override;
+	virtual double get_length() const override;
+	virtual bool is_meta_stream() const override { return true; }
+
+	AudioStreamSynchronized();
+
+protected:
+	static void _bind_methods();
+	void _validate_property(PropertyInfo &property) const;
+};
+
+///////////////////////////////////////
+
+class AudioStreamPlaybackSynchronized : public AudioStreamPlayback {
+	GDCLASS(AudioStreamPlaybackSynchronized, AudioStreamPlayback)
+	friend class AudioStreamSynchronized;
+
+private:
+	enum {
+		MIX_BUFFER_SIZE = 128
+	};
+	AudioFrame mix_buffer[MIX_BUFFER_SIZE];
+
+	Ref<AudioStreamSynchronized> stream;
+	Ref<AudioStreamPlayback> playback[AudioStreamSynchronized::MAX_STREAMS];
+
+	int play_order[AudioStreamSynchronized::MAX_STREAMS];
+
+	double stream_todo = 0.0;
+	int fade_index = -1;
+	double fade_volume = 1.0;
+	int play_index = 0;
+	double offset = 0.0;
+
+	int loop_count = 0;
+
+	bool active = false;
+
+	void _update_playback_instances();
+
+public:
+	virtual void start(double p_from_pos = 0.0) override;
+	virtual void stop() override;
+	virtual bool is_playing() const override;
+	virtual int get_loop_count() const override; // times it looped
+	virtual double get_playback_position() const override;
+	virtual void seek(double p_time) override;
+	virtual int mix(AudioFrame *p_buffer, float p_rate_scale, int p_frames) override;
+
+	virtual void tag_used_streams() override;
+
+	AudioStreamPlaybackSynchronized();
+	~AudioStreamPlaybackSynchronized();
+};