如何生成在Android复杂的声音? [英] How to generate complex sound on Android?
本文介绍了如何生成在Android复杂的声音?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我需要生成复杂的声音与实时Android的几个频率的频道(叠加)。我如何可以使用Android SDK(preferred)或NDK?
I need to generate complex sound with few frequences (superposition) on Android in real-time. How can i do it using Android SDK (preferred) or NDK?
看来,使用ToneGenerator不够灵活。
与产生的声音数据记录AudioTrack并播放这似乎是正确的方向,但我需要它在实时和录制和播放似乎不是实时的。
It seems that using ToneGenerator is not flexible enough. Recording AudioTrack with generated sound data and playing it seems to be the right direction, but i need it in real-time and recording and playing seems to be not real-time.
推荐答案
从书临Android的媒体肖恩凡每一个例子:
An example from the book "Pro Android Media" by Shawn Van Every:
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;
}
} }
这篇关于如何生成在Android复杂的声音?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
查看全文