Android 如何使用可视化工具对象的onWaveFormDataCapture结果?
我不熟悉android编程和音频可视化。我想使用和类创建一个简单的音频可视化工具。我的问题是,我不知道什么是波形数据。我必须使用它来可视化音频吗? 我正在使用下面的代码。问题是,它只会在文件的前10-12秒可视化音频;之后,我无法捕获更多数据!我哪里出错了Android 如何使用可视化工具对象的onWaveFormDataCapture结果?,android,fft,android-mediaplayer,waveform,visualizer,Android,Fft,Android Mediaplayer,Waveform,Visualizer,我不熟悉android编程和音频可视化。我想使用和类创建一个简单的音频可视化工具。我的问题是,我不知道什么是波形数据。我必须使用它来可视化音频吗? 我正在使用下面的代码。问题是,它只会在文件的前10-12秒可视化音频;之后,我无法捕获更多数据!我哪里出错了 public void attachVisualizer() { Visualizer vis = new Visualizer(mPlayer.getAudioSessionId()); vis.setCaptureSiz
public void attachVisualizer()
{
Visualizer vis = new Visualizer(mPlayer.getAudioSessionId());
vis.setCaptureSize(Visualizer.getCaptureSizeRange()[0]);
vis.setDataCaptureListener(new Visualizer.OnDataCaptureListener() {
public void onWaveFormDataCapture(Visualizer visualizer, byte[] bytes, int samplingRate) {
int sum = 0;
for(int i = 0; i < bytes.length; i++) {
sum += bytes[i];
}
if(sum > 8000) {
// Do something which uses mPlayer.getCurrentPosition() in mathematics
}
}
public void onFftDataCapture(Visualizer visualizer, byte[] fft, int samplingRate) {}
}, Visualizer.getMaxCaptureRate() , true, false);
vis.setEnabled(true);
}
public void attachVisualizer()
{
Visualizer vis=新的可视化工具(mPlayer.getAudioSessionId());
vis.setCaptureSize(Visualizer.getCaptureSizeRange()[0]);
vis.setDataCaptureListener(新的Visualizer.OnDataCaptureListener(){
public void onWaveFormDataCapture(可视化工具可视化工具,字节[]字节,整数采样){
整数和=0;
for(int i=0;i8000){
//做一些在数学中使用mPlayer.getCurrentPosition()的事情
}
}
public void onFftDataCapture(可视化工具可视化工具,字节[]fft,int samplingRate){}
},Visualizer.getMaxCaptureRate(),true,false);
vis.setEnabled(true);
}
编辑我脑海中的另一个问题是,如何记录给定音频段中包含的时间长度?我这样做:
visualizer = new Visualizer(0);
visualizer.setEnabled(false);
visualizer.setCaptureSize(Visualizer.getCaptureSizeRange()[0]);
visualizer.setDataCaptureListener(
new Visualizer.OnDataCaptureListener() {
public void onWaveFormDataCapture(Visualizer visualizer,
byte[] bytes, int samplingRate) {
eqview.setVSWaveForm(bytes);
}
public void onFftDataCapture(Visualizer visualizer,
byte[] bytes, int samplingRate) {
fftview.setVSFftData(bytes);
}
}, Visualizer.getMaxCaptureRate(), true, true);
visualizer.setEnabled(true);
对于Visualizer视图,我在网上找到了这段代码,但我没有编写它:
package app.util;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.view.View;
/***
*
*
* @author yokmama
*
*/
public class VisualizerView extends View {
private byte[] mBytes;
private float[] mPoints;
private Rect mRect = new Rect();
//SharedPreferences prefs;
private Paint mForePaint = new Paint();
public VisualizerView(Context context, AttributeSet attrs) {
super(context, attrs);
//prefs = PreferenceManager.getDefaultSharedPreferences(context);
init();
}
private void init() {
mBytes = null;
//int colorchosen = prefs.getInt("COLOR_PREFERENCE_KEY",
// Color.WHITE);
mForePaint.setStrokeWidth(1);
//mForePaint.setAntiAlias(true);
mForePaint.setColor(Color.WHITE);
//mForePaint.setMaskFilter(new BlurMaskFilter(1, Blur.INNER));
}
public void updateVisualizer(byte[] bytes) {
mBytes = bytes;
invalidate();
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
if (mBytes == null) {
return;
}
if (mPoints == null || mPoints.length < mBytes.length * 4) {
mPoints = new float[mBytes.length * 4];
}
mRect.set(0, 0, getWidth(), getHeight());
for (int i = 0; i < mBytes.length - 1; i++) {
mPoints[i * 4] = mRect.width() * i / (mBytes.length - 1);
mPoints[i * 4 + 1] = mRect.height() / 2
+ ((byte) (mBytes[i] + 128)) * (mRect.height() / 2) / 128;
mPoints[i * 4 + 2] = mRect.width() * (i + 1) / (mBytes.length - 1);
mPoints[i * 4 + 3] = mRect.height() / 2
+ ((byte) (mBytes[i + 1] + 128)) * (mRect.height() / 2)
/ 128;
}
canvas.drawLines(mPoints, mForePaint);
//canvas.drawPoints(mPoints, mForePaint);
}
package app.util;
导入android.content.Context;
导入android.graphics.Canvas;
导入android.graphics.Color;
导入android.graphics.Paint;
导入android.graphics.Rect;
导入android.util.AttributeSet;
导入android.view.view;
/***
*
*
*@作者yokmama
*
*/
公共类VisualizerView扩展视图{
专用字节[]MB;
私人浮动[]mpoint;
private Rect mRect=new Rect();
//共享引用优先权;
私有油漆mForePaint=新油漆();
公共可视化视图(上下文、属性集属性){
超级(上下文,attrs);
//prefs=PreferenceManager.GetDefaultSharedReferences(上下文);
init();
}
私有void init(){
mBytes=null;
//int colorSelected=prefs.getInt(“颜色首选项”,
//颜色(白色);
mForePaint.设置行程宽度(1);
//mForePaint.setAntiAlias(真);
mForePaint.setColor(颜色为白色);
//mForePaint.setMaskFilter(新的BlurMaskFilter(1,Blur.INNER));
}
public void updateVisualizer(字节[]字节){
MB=字节;
使无效();
}
@凌驾
受保护的void onDraw(画布){
super.onDraw(帆布);
如果(兆字节==null){
返回;
}
if(mPoints==null | | mPoints.length
}它以半高显示。我正在从服务设置字节