Add Chromium-only Blender WebEngine parity work

blender-5.2.0/extern/audaspace/src/fx/HRTF.cpp

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+/*******************************************************************************
+* Copyright 2015-2016 Juan Francisco Crespo Galán
+*
+* 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.
+******************************************************************************/
+
+#include "fx/HRTF.h"
+#include "Exception.h"
+
+#include <cmath>
+
+AUD_NAMESPACE_BEGIN
+HRTF::HRTF() :
+	HRTF(std::make_shared<FFTPlan>(0.0))
+{
+}
+
+HRTF::HRTF(std::shared_ptr<FFTPlan> plan) :
+	m_plan(plan)
+{
+	m_specs.channels = CHANNELS_INVALID;
+	m_specs.rate = 0;
+	m_empty = true;
+}
+
+bool HRTF::addImpulseResponse(std::shared_ptr<StreamBuffer> impulseResponse, float azimuth, float elevation)
+{
+	Specs spec = impulseResponse->getSpecs();
+
+	azimuth = std::fmod(azimuth, 360);
+	if(azimuth < 0)
+		azimuth += 360;
+
+	if((spec.channels != CHANNELS_MONO) || (spec.rate != m_specs.rate && m_specs.rate > 0.0))
+		return false;
+
+	m_hrtfs[elevation][azimuth] = std::make_shared<ImpulseResponse>(impulseResponse, m_plan);
+	m_specs.channels = CHANNELS_MONO;
+	m_specs.rate = spec.rate;
+	m_empty = false;
+	return true;
+}
+
+std::pair<std::shared_ptr<ImpulseResponse>, std::shared_ptr<ImpulseResponse>> HRTF::getImpulseResponse(float &azimuth, float &elevation)
+{
+	if(m_hrtfs.empty())
+		return std::make_pair(nullptr, nullptr);
+	azimuth = std::fmod(azimuth, 360);
+	if(azimuth < 0)
+		azimuth += 360;
+
+	std::shared_ptr<ImpulseResponse> R, L;
+	float az = 0, el = 0, dif=0, minDif=360;
+
+	for(auto elem : m_hrtfs)
+	{
+		dif = std::fabs(elevation - elem.first);
+		if(dif < minDif)
+		{
+			minDif = dif;
+			el = elem.first;
+		}
+	}
+	elevation = el;
+	dif = 0; 
+	minDif = 360;
+	
+	for(auto elem : m_hrtfs[elevation])
+	{
+		dif = std::fabs(azimuth - elem.first);
+		if(dif < minDif)
+		{
+			minDif = dif;
+			az = elem.first;
+			R = elem.second;
+		}
+	}
+	azimuth = az;
+	float azL = 360 - azimuth;
+	if(azL == 360)
+		azL = 0;
+
+	auto iter = m_hrtfs[elevation].find(azL);
+	if(iter != m_hrtfs[elevation].end())
+		L = iter->second;
+	else
+	{
+		dif = 0;
+		minDif = 360;
+		for(auto elem : m_hrtfs[elevation])
+		{
+			dif = std::fabs(azL - elem.first);
+			if(dif < minDif)
+			{
+				minDif = dif;
+				L = elem.second;
+			}
+		}
+	}
+	return std::make_pair(L, R);
+}
+
+Specs HRTF::getSpecs()
+{
+	return m_specs;
+}
+
+bool HRTF::isEmpty()
+{
+	return m_empty;
+}
+AUD_NAMESPACE_END