ビブラートエフェクトの残骸
#Siv3D
https://scrapbox.io/files/6501e5b00aad93001b591005.png
音声の周波数を揺らすエフェクトです。
マリオカートでサンダーに当たって小さくなっている時にBGMがふにゃふにゃになるアレです。
ピッチシフトフィルタを用いた強引な実装なので、ノイズがたくさん乗ります。
code:Main.cpp
# include <Siv3D.hpp> // OpenSiv3D v0.6.11
void Main()
{
Audio audio{ U"example/test.mp3", Loop::Yes };
Microphone mic{ unspecified };
Wave recordingBuffer(0, mic.getSampleRate());
bool vibrato = false;
double vibratoAmplitude = 1.5;
double vibratoFrequency = 3.0;
if (not GlobalAudio::SupportsPitchShift())
{
Print << U"ピッチシフトフィルタがサポートされていません！";
}
while (System::Update())
{
if (mic.isRecording())
{
auto&& buffer = mic.getBuffer();
const auto first = (buffer.begin() + recordingBuffer.size() % mic.getBufferLength());
const auto last = (buffer.begin() + mic.posSample() + 1);
if (last < first)
{
recordingBuffer.insert(recordingBuffer.end(), first, buffer.end());
recordingBuffer.insert(recordingBuffer.end(), buffer.begin(), last);
}
else
{
recordingBuffer.insert(recordingBuffer.end(), first, last);
}
}
if (SimpleGUI::Button(U"\U000f0770 Open", Vec2{ 50, 40 }, 120, (not mic.isRecording())))
{
if (auto newAudio = Dialog::OpenAudio())
{
audio = std::move(newAudio);
audio.setLoop(true);
audio.play();
}
}
if (SimpleGUI::Button((mic.isRecording() ? U"\U000f04Db Stop recording" : U"\U000f036c Record"), Vec2{ 180, 40 }, 200, mic.isOpen()))
{
if (mic.isRecording())
{
mic.stop();
audio = Audio{ recordingBuffer, Loop::Yes };
audio.play();
recordingBuffer.clear();
}
else
{
audio.pause();
mic.start();
}
}
{
Rect{ 390, 40, 360, 36 }.draw(Palette::White);
RoundRect{ 478, 55, 264, 6, 2 }.draw(ColorF{ 0.33 });
RoundRect{ 478, 55, 264 * mic.mean(), 6, 2 }.draw(ColorF{ 0.35, 0.7, 1.0 });
SimpleGUI::GetFont()(FormatTime(SecondsF{ recordingBuffer.lengthSec() }, U"M:ss")).draw(Arg::leftCenter(398, 57), Palette::Black);
}
if (SimpleGUI::Button((audio.isPlaying() ? U"\U000f03e4" : U"\U000f040a"), Vec2{ 50, 120 }, 60, (not mic.isRecording())))
{
if (audio.isPlaying())
{
audio.pause();
}
else
{
audio.play();
}
}
const String time = U"{} / {}"_fmt(FormatTime(SecondsF{ audio.posSec() }, U"M:ss"), FormatTime(SecondsF{ audio.lengthSec() }, U"M:ss"));
double progress = (static_cast<double>(audio.posSample()) / audio.samples());
if (SimpleGUI::Slider(time, progress, Vec2{ 120, 120 }, 130, 500))
{
audio.pause();
audio.seekSamples(static_cast<size_t>(audio.samples() * progress));
}
if (SimpleGUI::CheckBox(vibrato, U"Vibrato", Vec2{ 50, 200 }, 150, GlobalAudio::SupportsPitchShift()))
{
if (not vibrato)
{
GlobalAudio::BusSetPitchShiftFilter(MixBus0, 0, 0);
}
}
SimpleGUI::Slider(U"Amplitude: {:.2f}"_fmt(vibratoAmplitude), vibratoAmplitude, 0, 12, Vec2{ 210, 200 }, 180, 360);
SimpleGUI::Slider(U"Frequency: {:.2f}"_fmt(vibratoFrequency), vibratoFrequency, 0, 24, Vec2{ 210, 240 }, 180, 360);
if (vibrato)
{
const double pitchShift = vibratoAmplitude * Sin(2_pi * vibratoFrequency * Scene::Time());
GlobalAudio::BusSetPitchShiftFilter(MixBus0, 0, pitchShift);
}
}
}