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如何在Android上生成复杂的声音?_Android_Audio - Fatal编程技术网

如何在Android上生成复杂的声音?

如何在Android上生成复杂的声音?,android,audio,Android,Audio,我需要在Android上实时生成频率很少(叠加)的复杂声音。我如何使用安卓SDK(首选)或NDK实现这一点 看来使用ToneGenerator不够灵活。 使用生成的声音数据录制音轨并播放似乎是正确的方向,但我需要实时录制和播放,而录制和播放似乎不是实时的。肖恩·范的《Pro Android Media》一书中的一个例子: import android.app.Activity; import android.media.AudioFormat; import android.media.Audi

我需要在Android上实时生成频率很少(叠加)的复杂声音。我如何使用安卓SDK(首选)或NDK实现这一点

看来使用ToneGenerator不够灵活。 使用生成的声音数据录制音轨并播放似乎是正确的方向,但我需要实时录制和播放,而录制和播放似乎不是实时的。

肖恩·范的《Pro Android Media》一书中的一个例子:

import android.app.Activity;
import android.media.AudioFormat;
import android.media.AudioManager;
import android.media.AudioTrack;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class AudioSynthesis extends Activity implements OnClickListener {
    Button startSound;
    Button endSound;

AudioSynthesisTask audioSynth;
boolean keepGoing = false;
float synth_frequency = 440; // 440 Hz, Middle A

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    startSound = (Button) this.findViewById(R.id.StartSound);
    startSound.setOnClickListener(this);
    endSound = (Button) this.findViewById(R.id.EndSound);
    endSound.setOnClickListener(this);
    endSound.setEnabled(false);
}

@Override
public void onPause() {
    super.onPause();
    keepGoing = false;
    endSound.setEnabled(false);
    startSound.setEnabled(true);
}

public void onClick(View v) {
    if (v == startSound) {
        keepGoing = true;
        audioSynth = new AudioSynthesisTask();
        audioSynth.execute();
        endSound.setEnabled(true);
        startSound.setEnabled(false);
    } else if (v == endSound) {
        keepGoing = false;
        endSound.setEnabled(false);
        startSound.setEnabled(true);
    }
}

private class AudioSynthesisTask extends AsyncTask<Void, Void, Void>
{
    @Override
    protected Void doInBackground(Void... params) {
        final int SAMPLE_RATE= 11025;
        int minSize = AudioTrack.getMinBufferSize(SAMPLE_RATE,
                AudioFormat.CHANNEL_CONFIGURATION_MONO,
                AudioFormat.ENCODING_PCM_16BIT);
        AudioTrack audioTrack = new AudioTrack(AudioManager.STREAM_MUSIC,
            SAMPLE_RATE,
            AudioFormat.CHANNEL_CONFIGURATION_MONO,
            AudioFormat.ENCODING_PCM_16BIT,
            minSize,
            AudioTrack.MODE_STREAM);
    audioTrack.play();
    short[] buffer = new short[minSize];
    float angular_frequency =
       (float)(2*Math.PI) * synth_frequency / SAMPLE_RATE;
    float angle = 0;
    while (keepGoing) {
         for (int i = 0; i < buffer.length; i++)
         {
             buffer[i] = (short)(Short.MAX_VALUE * ((float) Math.sin(angle)));
             angle += angular_frequency;
         }
         audioTrack.write(buffer, 0, buffer.length);
    }
    return null;
}
} }
导入android.app.Activity;
导入android.media.AudioFormat;
导入android.media.AudioManager;
导入android.media.AudioTrack;
导入android.os.AsyncTask;
导入android.os.Bundle;
导入android.util.Log;
导入android.view.view;
导入android.view.view.OnClickListener;
导入android.widget.Button;
公共类AudioSynthesis扩展了活动实现OnClickListener{
按钮启动声音;
按钮结束音;
音频合成器sk audioSynth;
布尔值keepGoing=false;
浮点合成器频率=440;//440 Hz,中间A
@凌驾
创建时的公共void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
startSound=(按钮)this.findViewById(R.id.startSound);
startSound.setOnClickListener(这个);
endSound=(按钮)this.findViewById(R.id.endSound);
setOnClickListener(这个);
endSound.setEnabled(false);
}
@凌驾
公共无效暂停(){
super.onPause();
keepGoing=false;
endSound.setEnabled(false);
startSound.setEnabled(true);
}
公共void onClick(视图v){
如果(v==startSound){
持续=正确;
audioSynth=新的AudioSynthesisTask();
audioSynth.execute();
endSound.setEnabled(true);
startSound.setEnabled(false);
}else if(v==endSound){
keepGoing=false;
endSound.setEnabled(false);
startSound.setEnabled(true);
}
}
私有类AudioSynthesisTask扩展异步任务
{
@凌驾
受保护的Void doInBackground(Void…参数){
最终整数抽样率=11025;
int minSize=AudioTrack.getMinBufferSize(采样率,
AudioFormat.CHANNEL\u配置\u单声道,
音频格式。编码(PCM(16位);
AudioTrack AudioTrack=新的AudioTrack(AudioManager.STREAM_MUSIC,
抽样率,
AudioFormat.CHANNEL\u配置\u单声道,
AudioFormat.ENCODING_PCM_16位,
minSize,
音频跟踪模式(音频流);
音轨播放();
short[]buffer=新的short[minSize];
浮动角频率=
(浮点)(2*数学PI)*合成频率/采样率;
浮动角度=0;
同时(继续){
for(int i=0;i