initial commit, 4.5 stable

servers/audio/effects/audio_effect_amplify.cpp

@@ -0,0 +1,83 @@
+/**************************************************************************/
+/*  audio_effect_amplify.cpp                                              */
+/**************************************************************************/
+/*                         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.                 */
+/**************************************************************************/
+
+#include "audio_effect_amplify.h"
+
+void AudioEffectAmplifyInstance::process(const AudioFrame *p_src_frames, AudioFrame *p_dst_frames, int p_frame_count) {
+	//multiply volume interpolating to avoid clicks if this changes
+	float volume_db = base->volume_db;
+	float vol = Math::db_to_linear(mix_volume_db);
+	float vol_inc = (Math::db_to_linear(volume_db) - vol) / float(p_frame_count);
+
+	for (int i = 0; i < p_frame_count; i++) {
+		p_dst_frames[i] = p_src_frames[i] * vol;
+		vol += vol_inc;
+	}
+	//set volume for next mix
+	mix_volume_db = volume_db;
+}
+
+Ref<AudioEffectInstance> AudioEffectAmplify::instantiate() {
+	Ref<AudioEffectAmplifyInstance> ins;
+	ins.instantiate();
+	ins->base = Ref<AudioEffectAmplify>(this);
+	ins->mix_volume_db = volume_db;
+	return ins;
+}
+
+void AudioEffectAmplify::set_volume_db(float p_volume) {
+	volume_db = p_volume;
+}
+
+float AudioEffectAmplify::get_volume_db() const {
+	return volume_db;
+}
+
+void AudioEffectAmplify::set_volume_linear(float p_volume) {
+	set_volume_db(Math::linear_to_db(p_volume));
+}
+
+float AudioEffectAmplify::get_volume_linear() const {
+	return Math::db_to_linear(get_volume_db());
+}
+
+void AudioEffectAmplify::_bind_methods() {
+	ClassDB::bind_method(D_METHOD("set_volume_db", "volume"), &AudioEffectAmplify::set_volume_db);
+	ClassDB::bind_method(D_METHOD("get_volume_db"), &AudioEffectAmplify::get_volume_db);
+	ClassDB::bind_method(D_METHOD("set_volume_linear", "volume"), &AudioEffectAmplify::set_volume_linear);
+	ClassDB::bind_method(D_METHOD("get_volume_linear"), &AudioEffectAmplify::get_volume_linear);
+
+	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "volume_db", PROPERTY_HINT_RANGE, "-80,24,0.01,suffix:dB"), "set_volume_db", "get_volume_db");
+	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "volume_linear", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NONE), "set_volume_linear", "get_volume_linear");
+}
+
+AudioEffectAmplify::AudioEffectAmplify() {
+	volume_db = 0;
+}