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AudioVisualizer.hpp
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AudioVisualizer.hpp
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/*
* Copyright (c) 2019 Rayé Maxime
*
* 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
// For Windows
#define _USE_MATH_DEFINES
#include <cmath>
#include <cstddef>
#include <complex>
#include <array>
#include <valarray>
#include <SFML/Audio/Sound.hpp>
#include <SFML/Audio/SoundBuffer.hpp>
class AudioVisualizer final {
public:
static constexpr size_t BUFFER_SIZE{8196};
static constexpr double FREQ_MAX{62500};
private:
using Complex = std::complex<double>;
using ComplexArray = std::valarray<Complex>;
const sf::Sound &_sound;
const sf::SoundBuffer &_buffer;
ComplexArray _array{};
std::array<double, BUFFER_SIZE> _scaleList{};
struct SoundBufferData {
decltype(_buffer.getChannelCount()) channelCount;
decltype(_buffer.getSampleCount()) sampleCount;
decltype(_buffer.getSampleRate()) sampleRate;
SoundBufferData(decltype(_buffer.getChannelCount()) channelCount,
decltype(_buffer.getSampleCount()) sampleCount,
decltype(_buffer.getSampleRate()) sampleRate)
: channelCount{channelCount}, sampleCount{sampleCount}, sampleRate{sampleRate}
{}
};
struct VisualizationData {
const double scaleAverage{0};
const decltype(_scaleList) *scaleList{};
};
const SoundBufferData _bufferData;
void _fastFourierTransform(decltype(_array) &array);
static void _smoothArray(decltype(_scaleList) &data);
public:
AudioVisualizer(decltype(_sound) sound, decltype(_buffer) buffer);
AudioVisualizer(const AudioVisualizer &) = delete;
AudioVisualizer &operator=(const AudioVisualizer &) = delete;
VisualizationData getVisualizationData();
};