玩android系统中的活动重复AudioTrack [英] Playing repeated AudioTrack in android activity
本文介绍了玩android系统中的活动重复AudioTrack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
我想打在指定的速度，例如重复脉冲音3次。它的工作原理约20次，然后如下崩溃。
无效playSound（）{
最后AudioTrack audioTrack =新AudioTrack（AudioManager.STREAM_MUSIC，采样率，AudioFormat.CHANNEL_CONFIGURATION_MONO，AudioFormat.ENCODING_PCM_16BIT，generatedSnd.length，AudioTrack.MODE_STATIC）;
audioTrack.write（generatedSnd，0，generatedSnd.length）;
audioTrack.play（）;
}
在一个AsyncTask的我运行一个不断循环，检查时间并在需要时调用playSound。它的工作原理了几秒钟，然后得到这个错误，
01-02 18：24：45.035：E / AndroidRuntime（6599）：java.lang.IllegalStateException：通过打造成（）呼吁未初始化AudioTrack。
即使轨道每次初始化。
什么我做错了任何指示？或者可以做的更好？
这里的code：
公共类DisplayBowieActivity延伸活动{私人最终诠释持续时间= 200; //秒
私人最终诠释采样率= 8000;
私人最终诠释NUMSAMPLES =持续时间*采样率/ 1000;
私人双样本[]; // =新的双[NUMSAMPLES]
私人最终双freqOfTone = 1440; //赫兹
私人诠释脉冲长度;
专用字节generatedSnd []; // =新的字节[2 * NUMSAMPLES]。
私人诠释周期= 4; //赫兹
私人AudioTrack audioTrack;
处理程序处理程序=新的处理程序（）;@覆盖
保护无效的onCreate（捆绑savedInstanceState）{
super.onCreate（savedInstanceState）;
的setContentView（R.layout.activity_display_bowie）; 意向意图= getIntent（）;
字符串smessage = intent.getStringExtra（MainActivity.SOUND_MESSAGE）;
周期=的Integer.parseInt（smessage）;
脉冲长度=持续时间*采样率/ 1000;
System.out.print（+++期+周期）;
System.out.print（+++脉冲+脉冲长度）; genTone（）; 查看查看= this.getWindow（）getDecorView（）。
view.setBackgroundColor（Color.parseColor（＃8E8E38））;}@覆盖
公共布尔onCreateOptionsMenu（菜单菜单）{
//充气菜单;如果是present这增加了项目操作栏。
。getMenuInflater（）膨胀（R.menu.display_bowie，菜单）;
返回true;
}@覆盖
保护无效onResume（）{
super.onResume（）; 新SoundGen（）执行（期）;}私有类SoundGen扩展的AsyncTask＆LT;整数，太虚，太虚＆GT; {
@覆盖
保护无效doInBackground（整数...赫兹）{
长密耳=（int）的（1000.0 /赫兹[0]）;
长启动= System.currentTimeMillis的（）;
在下长=启动+密耳; 而（真）{
长今= System.currentTimeMillis的（）;
如果（现＆gt;下面）{
接下来= NOW +密耳;
播放声音（）;
} }
}}无效genTone（）{
样品=新的双[NUMSAMPLES]
generatedSnd =新的字节[2 * NUMSAMPLES]。
INT率= NUMSAMPLES /期; 的for（int i = 0; I＆LT; NUMSAMPLES ++我）{
如果（I％率== 0）{
的System.out.println（+++创建音+ I）; INT J = 0;
为（J = 0; J＆LT;脉冲长度; J ++）{ 样本[I + J] = Math.sin（2 * Math.PI *（I + J）
/（采样率/ freqOfTone））;
的System.out.println（+++ SAMPLE+（I + J）+
+样本[I + J]）;
}
I = I + J;
}
} //转换成16位PCM阵列声音
//假设样品缓冲液是标准化。
INT IDX = 0;
对于（最终双DVAL：样品）{
//规模最大振幅
最终短VAL =（短）（（* DVAL 32767））;
//在16位WAV PCM，第一个字节是低位字节
generatedSnd [IDX +] =（字节）（VAL＆安培;设为0x00FF）;
generatedSnd [IDX ++] =（字节）（（VAL＆放大器;为0xFF00）GT;＆GT;→8）; }}
无效playSound（）{
的System.out.println（+++ PLAY）;
//audioTrack.stop（）;
//audioTrack.setPlaybackHeadPosition(0）;
最后AudioTrack audioTrack =新AudioTrack（AudioManager.STREAM_MUSIC，采样率，AudioFormat.CHANNEL_CONFIGURATION_MONO，AudioFormat.ENCODING_PCM_16BIT，generatedSnd.length，AudioTrack.MODE_STATIC）;
audioTrack.write（generatedSnd，0，generatedSnd.length）;
audioTrack.play（）;
}
和这里的完整的错误：
01-02 18：24：45.035：E / AndroidRuntime（6599）：致命异常：AsyncTask的＃1
01-02 18：24：45.035：E / AndroidRuntime（6599）：了java.lang.RuntimeException：执行doInBackground发生错误（）
01-02 18：24：45.035：E / AndroidRuntime（6599）：在android.os.AsyncTask $ 3.done（AsyncTask.java:200）
01-02 18：24：45.035：E / AndroidRuntime（6599）：在java.util.concurrent.FutureTask中$ Sync.innerSetException（FutureTask.java:274）
01-02 18：24：45.035：E / AndroidRuntime（6599）：在java.util.concurrent.FutureTask.setException（FutureTask.java:125）
01-02 18：24：45.035：E / AndroidRuntime（6599）：在java.util.concurrent.FutureTask中$ Sync.innerRun（FutureTask.java:308）
01-02 18：24：45.035：E / AndroidRuntime（6599）：在java.util.concurrent.FutureTask.run（FutureTask.java:138）
01-02 18：24：45.035：E / AndroidRuntime（6599）：在java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1088）
01-02 18：24：45.035：E / AndroidRuntime（6599）：在java.util.concurrent.ThreadPoolExecutor中的$ Worker.run（ThreadPoolExecutor.java:581）
01-02 18：24：45.035：E / AndroidRuntime（6599）：在java.lang.Thread.run（Thread.java:1019）
01-02 18：24：45.035：E / AndroidRuntime（6599）：java.lang.IllegalStateException：通过打造成（）呼吁未初始化AudioTrack。
01-02 18：24：45.035：E / AndroidRuntime（6599）：在android.media.AudioTrack.play（AudioTrack.java:824）
01-02 18：24：45.035：E / AndroidRuntime（6599）：在uk.co.moonsit.signals.DisplayBowieActivity.playSound（DisplayBowieActivity.java:164）
01-02 18：24：45.035：E / AndroidRuntime（6599）：在uk.co.moonsit.signals.DisplayBowieActivity $ SoundGen.doInBackground（DisplayBowieActivity.java:90）
01-02 18：24：45.035：E / AndroidRuntime（6599）：在uk.co.moonsit.signals.DisplayBowieActivity $ SoundGen.doInBackground（DisplayBowieActivity.java:1）
01-02 18：24：45.035：E / AndroidRuntime（6599）：在android.os.AsyncTask $ 2.call（AsyncTask.java:185）
01-02 18：24：45.035：E / AndroidRuntime（6599）：在java.util.concurrent.FutureTask中$ Sync.innerRun（FutureTask.java:306）
01-02 18：24：45.035：E / AndroidRuntime（6599）：... 4个
解决方案
您正在运行了AudioTracks的，你的情况20，30日我的Nexus4，这给了我：
175-5975 /？ E / AudioFlinger：可用没有更多的曲目名称
一个解决方案 - 使用你已经拥有全球audioTrack对象，为null，并在每场比赛创造：
无效playSound（）{
的System.out.println（+++ PLAY）; //如果audioTrack已经初始化，第一，释放所有资源
//那么它空
如果（audioTrack！= NULL）{
audioTrack.release（）;
audioTrack = NULL;
} //现在又创建它，注意事项：使用全局audioTrack，
//这意味着删除最终AudioTrack在这里
audioTrack =新AudioTrack（AudioManager.STREAM_MUSIC，采样率，AudioFormat.CHANNEL_CONFIGURATION_MONO，AudioFormat.ENCODING_PCM_16BIT，generatedSnd.length，AudioTrack.MODE_STATIC）; audioTrack.write（generatedSnd，0，generatedSnd.length）;
audioTrack.play（）;
}
I want to play a tone pulse repeated at a specified rate, e.g. 3 times a second. It works about 20 times and then crashes as below.
void playSound() {
final AudioTrack audioTrack = new AudioTrack(AudioManager.STREAM_MUSIC, sampleRate, AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_16BIT, generatedSnd.length, AudioTrack.MODE_STATIC);
audioTrack.write(generatedSnd, 0, generatedSnd.length);
audioTrack.play();
}
In an asynctask I run a continuous loop that checks the time and calls playSound when required. It works for a few seconds and then get this error,
01-02 18:24:45.035: E/AndroidRuntime(6599): Caused by: java.lang.IllegalStateException: play() called on uninitialized AudioTrack.
even though the track is initialised each time.
Any indication of what I am doing wrong? Or could do better?
Here's the code:
public class DisplayBowieActivity extends Activity {
private final int duration = 200; // seconds
private final int sampleRate = 8000;
private final int numSamples = duration * sampleRate / 1000;
private double sample[];// =new double[numSamples];
private final double freqOfTone = 1440; // hz
private int pulseLength;
private byte generatedSnd[];// = new byte[2 * numSamples];
private int period = 4; // hz
private AudioTrack audioTrack;
Handler handler = new Handler();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_display_bowie);
Intent intent = getIntent();
String smessage = intent.getStringExtra(MainActivity.SOUND_MESSAGE);
period = Integer.parseInt(smessage);
pulseLength = duration * sampleRate / 1000;
System.out.print("+++ Period " + period);
System.out.print("+++ Pulse " + pulseLength);
genTone();
View view = this.getWindow().getDecorView();
view.setBackgroundColor(Color.parseColor("#8E8E38"));
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.display_bowie, menu);
return true;
}
@Override
protected void onResume() {
super.onResume();
new SoundGen().execute(period);
}
private class SoundGen extends AsyncTask<Integer, Void, Void> {
@Override
protected Void doInBackground(Integer... hz) {
long mils = (int) (1000.0 / hz[0]);
long start = System.currentTimeMillis();
long next = start + mils;
while (true) {
long now = System.currentTimeMillis();
if (now > next) {
next = now + mils;
playSound();
}
}
}
}
void genTone() {
sample = new double[numSamples];
generatedSnd = new byte[2 * numSamples];
int rate = numSamples / period;
for (int i = 0; i < numSamples; ++i) {
if (i % rate == 0) {
System.out.println("+++ Create tone " + i);
int j = 0;
for (j = 0; j < pulseLength; j++) {
sample[i + j] = Math.sin(2 * Math.PI * (i + j)
/ (sampleRate / freqOfTone));
System.out.println("+++ SAMPLE " + (i + j) + " "
+ sample[i + j]);
}
i = i + j;
}
}
// convert to 16 bit pcm sound array
// assumes the sample buffer is normalised.
int idx = 0;
for (final double dVal : sample) {
// scale to maximum amplitude
final short val = (short) ((dVal * 32767));
// in 16 bit wav PCM, first byte is the low order byte
generatedSnd[idx++] = (byte) (val & 0x00ff);
generatedSnd[idx++] = (byte) ((val & 0xff00) >>> 8);
}
}
void playSound() {
System.out.println("+++ PLAY " );
//audioTrack.stop();
//audioTrack.setPlaybackHeadPosition(0);
final AudioTrack audioTrack = new AudioTrack(AudioManager.STREAM_MUSIC, sampleRate, AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_16BIT, generatedSnd.length, AudioTrack.MODE_STATIC);
audioTrack.write(generatedSnd, 0, generatedSnd.length);
audioTrack.play();
}
And here's the full error:
01-02 18:24:45.035: E/AndroidRuntime(6599): FATAL EXCEPTION: AsyncTask #1
01-02 18:24:45.035: E/AndroidRuntime(6599): java.lang.RuntimeException: An error occured while executing doInBackground()
01-02 18:24:45.035: E/AndroidRuntime(6599): at android.os.AsyncTask$3.done(AsyncTask.java:200)
01-02 18:24:45.035: E/AndroidRuntime(6599): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:274)
01-02 18:24:45.035: E/AndroidRuntime(6599): at java.util.concurrent.FutureTask.setException(FutureTask.java:125)
01-02 18:24:45.035: E/AndroidRuntime(6599): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:308)
01-02 18:24:45.035: E/AndroidRuntime(6599): at java.util.concurrent.FutureTask.run(FutureTask.java:138)
01-02 18:24:45.035: E/AndroidRuntime(6599): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088)
01-02 18:24:45.035: E/AndroidRuntime(6599): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581)
01-02 18:24:45.035: E/AndroidRuntime(6599): at java.lang.Thread.run(Thread.java:1019)
01-02 18:24:45.035: E/AndroidRuntime(6599): Caused by: java.lang.IllegalStateException: play() called on uninitialized AudioTrack.
01-02 18:24:45.035: E/AndroidRuntime(6599): at android.media.AudioTrack.play(AudioTrack.java:824)
01-02 18:24:45.035: E/AndroidRuntime(6599): at uk.co.moonsit.signals.DisplayBowieActivity.playSound(DisplayBowieActivity.java:164)
01-02 18:24:45.035: E/AndroidRuntime(6599): at uk.co.moonsit.signals.DisplayBowieActivity$SoundGen.doInBackground(DisplayBowieActivity.java:90)
01-02 18:24:45.035: E/AndroidRuntime(6599): at uk.co.moonsit.signals.DisplayBowieActivity$SoundGen.doInBackground(DisplayBowieActivity.java:1)
01-02 18:24:45.035: E/AndroidRuntime(6599): at android.os.AsyncTask$2.call(AsyncTask.java:185)
01-02 18:24:45.035: E/AndroidRuntime(6599): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306)
01-02 18:24:45.035: E/AndroidRuntime(6599): ... 4 more
解决方案
You're running out of AudioTracks, 20 in your case, 30 on my Nexus4, which gives me:
175-5975/? E/AudioFlinger﹕ no more track names available
A solution - use global audioTrack object that you already have, and null it and create on every play:
void playSound() {
System.out.println("+++ PLAY ");
//if audioTrack has been initialised, first, release any resources
//then null it
if (audioTrack != null) {
audioTrack.release();
audioTrack = null;
}
//now create it again, note: use global audioTrack,
//that means remove "final AudioTrack" here
audioTrack = new AudioTrack(AudioManager.STREAM_MUSIC, sampleRate, AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_16BIT, generatedSnd.length, AudioTrack.MODE_STATIC);
audioTrack.write(generatedSnd, 0, generatedSnd.length);
audioTrack.play();
}
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