ofx Relatime Audio Power Spectrum
/*
This example demonstrates how to use the GRT FFT algorithm in openFrameworks
*/
#pragma once
#include "ofMain.h"
#include "ofxGrt.h"
//State that we want to use the GRT namespace
using namespace GRT;
class ofApp : public ofBaseApp{
public:
void setup();
void update();
void draw();
void keyPressed (int key);
void keyReleased(int key);
void mouseMoved(int x, int y );
void mouseDragged(int x, int y, int button);
void mousePressed(int x, int y, int button);
void mouseReleased(int x, int y, int button);
void windowResized(int w, int h);
void dragEvent(ofDragInfo dragInfo);
void gotMessage(ofMessage msg);
void audioIn(float * input, int bufferSize, int nChannels);
//Create some variables for the demo
FFT fft;
ofxGrtTimeseriesPlot magnitudePlot;
};
//cpp -----------------------------------------------------
/*
*/
#include "ofApp.h"
#define AUDIO_BUFFER_SIZE 512
#define AUDIO_SAMPLE_RATE 44100
#define FFT_WINDOW_SIZE 2048
#define FFT_HOP_SIZE AUDIO_BUFFER_SIZE
//--------------------------------------------------------------
void ofApp::setup(){
ofSetFrameRate(60);
fft.init(FFT_WINDOW_SIZE,FFT_HOP_SIZE,1,FFT::RECTANGULAR_WINDOW,true,false);
magnitudePlot.setup( FFT_WINDOW_SIZE/2, 1 );
ofSoundStreamSetup(2, 1, this, AUDIO_SAMPLE_RATE, AUDIO_BUFFER_SIZE, 4);
}
//--------------------------------------------------------------
void ofApp::update(){
//Grab the current mouse x and y position
VectorDouble sample(2);
vector< FastFourierTransform > &results = fft.getFFTResultsPtr();
magnitudePlot.setData( results[0].getMagnitudeData() );
}
//--------------------------------------------------------------
void ofApp::draw(){
ofBackground(0, 0, 0);
float margin = 10;
magnitudePlot.draw( margin, margin, ofGetWidth() - margin*2, 250 );
}
void ofApp::audioIn(float * input, int bufferSize, int nChannels){
GRT::VectorDouble data(1);
for (int i=0; i<bufferSize; i++) {
data[0] = input[i];
fft.update( data );
}
}
/*
답글삭제This example demonstrates how to use the GRT FFT algorithm in openFrameworks
*/
#pragma once
#include "ofMain.h"
#include "ofxGrt.h" # 오디오 스펙트럼 용.
//State that we want to use the GRT namespace
using namespace GRT; # 네임 스페이스
class ofApp : public ofBaseApp{
public:
void setup();
void update();
void draw();
void keyPressed (int key);
void keyReleased(int key);
void mouseMoved(int x, int y );
void mouseDragged(int x, int y, int button);
void mousePressed(int x, int y, int button);
void mouseReleased(int x, int y, int button);
void windowResized(int w, int h);
void dragEvent(ofDragInfo dragInfo);
void gotMessage(ofMessage msg);
# 오디오입력 메써드 프로토타입
void audioIn(float * input, int bufferSize, int nChannels);
//Create some variables for the demo
FFT fft; # FFT 변수
ofxGrtTimeseriesPlot magnitudePlot; # 시계열 그래프
};
/*
답글삭제*/
#include "ofApp.h"
// 상수 선언
#define AUDIO_BUFFER_SIZE 512 // 오디오 버퍼 사이즈
#define AUDIO_SAMPLE_RATE 44100 // 샘플 레이트
#define FFT_WINDOW_SIZE 2048 // 푸리에변환 1차원 윈도우 사이즈
#define FFT_HOP_SIZE AUDIO_BUFFER_SIZE // 윈도우 stride, 오디오 버퍼 사이즈
//--------------------------------------------------------------
void ofApp::setup(){
ofSetFrameRate(60); // 화면 갱신율 60 fr/sec
//푸리에변환 초기화
fft.init(FFT_WINDOW_SIZE,FFT_HOP_SIZE,1,FFT::RECTANGULAR_WINDOW,true,false);
//직각 윈도우
//루트민스퀘어 이미지 플랏 초기화, 높이, 폭
magnitudePlot.setup( FFT_WINDOW_SIZE/2, 1 );
//마이크 입력 사운드스트림 설정.
ofSoundStreamSetup(2, 1, this, AUDIO_SAMPLE_RATE, AUDIO_BUFFER_SIZE, 4);
}
//--------------------------------------------------------------
void ofApp::update(){
//Grab the current mouse x and y position
// 더블 백터로 마우스 좌표 캡쳐
VectorDouble sample(2);
// 오디오 푸리에변환
vector< FastFourierTransform > &results = fft.getFFTResultsPtr();
// 진폭 플랏을 위한 데이타 할당. 속도 데이타를 위해 실수데이타만 사용?
magnitudePlot.setData( results[0].getMagnitudeData() );
}
//--------------------------------------------------------------
void ofApp::draw(){
// 검정 배경
ofBackground(100, 100, 100);
float margin = 10; // 그래프 드로잉 위치
// 10,10, w=마진고려, h=250
magnitudePlot.draw( margin, margin, ofGetWidth() - margin*2, 250 );
}
// 오디오 입력 메써드 인줄 알았더니, 이벤트 핸들러? -----------------------------
void ofApp::audioIn(float * input, int bufferSize, int nChannels){
GRT::VectorDouble data(1); // 배정도 벡터
for (int i=0; i<bufferSize; i++) {
// 오디오 버퍼 사이즈 만큼 반복
data[0] = input[i]; // 오디오 취득
fft.update( data ); // 푸리에 데이타 갱신.
}
}
//--------------------------------------------------------------
void ofApp::keyPressed(int key){
}
//--------------------------------------------------------------
void ofApp::keyReleased(int key){
}
//--------------------------------------------------------------
void ofApp::mouseMoved(int x, int y ){
}
//--------------------------------------------------------------
void ofApp::mouseDragged(int x, int y, int button){
}
//--------------------------------------------------------------
void ofApp::mousePressed(int x, int y, int button){
}
//--------------------------------------------------------------
void ofApp::mouseReleased(int x, int y, int button){
}
//--------------------------------------------------------------
void ofApp::windowResized(int w, int h){
}
//--------------------------------------------------------------
void ofApp::gotMessage(ofMessage msg){
}
//--------------------------------------------------------------
void ofApp::dragEvent(ofDragInfo dragInfo){
}