当我尝试生成第22次未初始化的语气异常AudioTrack [英] uninitialized AudioTrack exception when I try to generate tone on 22nd time
问题描述
我有我需要显示拨号盘屏幕一样的要求，我不得不产生1kHz的音（DTMF未音）每当在拨号盘按钮，用户presses。
I have a requirement that I need to display a dial pad like screen and I have to generate 1khz tone (not DTMF tone) whenever user presses on a dial pad buttons.
我已经使用了code从下面的链接，产生1 kHz音调：
I have used the code from the below link to generate 1 khz tone:
播放与Android 的任意音
当我在我的拨号盘屏幕上开始拨号键，直到21 presses它成功生成基调，但22日尝试之后我得到应用无响应（ANR）错误，我需要关闭应用程序。
When I started dialing buttons on my dialpad screen till 21 presses it is successfully generating tone but after 22nd attempt I am getting Application Not Responding (ANR) error and I need to close the app.
下面是我的code：
final float duration = 0.3f; // seconds
final int sampleRate = 4000;
final int numSamples = (int)duration * sampleRate + 100;
final double sample[] = new double[numSamples];
final double freqOfTone = 1000; // hz
final byte generatedSnd[] = new byte[2 * numSamples];
final Handler handler = new Handler();
public void onClick(View v) {
// TODO Auto-generated method stub
int id = v.getId();
playSound();
}
private void playSound()
{
final Thread thread = new Thread(new Runnable() {
public void run() {
genTone();
handler.post(new Runnable() {
public void run() {
playSound1();
}
});
}
});
thread.start();
}
void playSound1(){
final AudioTrack audioTrack = new AudioTrack(AudioManager.STREAM_MUSIC,
sampleRate, AudioFormat.CHANNEL_CONFIGURATION_MONO,
AudioFormat.ENCODING_PCM_16BIT, numSamples,
AudioTrack.MODE_STATIC);
audioTrack.write(generatedSnd, 0, generatedSnd.length);
audioTrack.play();
}
void genTone(){
// fill out the array
for (int i = 0; i < numSamples; ++i) {
sample[i] = Math.sin(2 * Math.PI * i / (sampleRate/freqOfTone));
}
// 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);
}
}
的onClick（）方法将在每次当我美元的拨号盘p $ PSS按键时调用。
onClick() method will be called each time when I press buttons on the dialpad.
上述code，我在LogCat中得到这样的输出：
with the above code I am getting this output in Logcat:
05.500 E/AudioFlinger( 85): no more track names available
09-21 05:20:05.500 E/AudioTrack( 133): AudioFlinger could not create track, status: -12
09-21 05:20:05.503 E/SoundPool( 133): Error creating AudioTrack
09-21 05:20:05.535 E/AudioFlinger( 85): no more track names available
09-21 05:20:05.535 E/AudioTrack( 6080): AudioFlinger could not create track, status: -12
09-21 05:20:05.535 E/AudioTrack-JNI( 6080): Error initializing AudioTrack
09-21 05:20:05.535 E/AudioTrack-Java( 6080): [ android.media.AudioTrack ] Error code -20 when initializing AudioTrack.
09-21 05:20:05.535 D/AndroidRuntime( 6080): Shutting down VM
09-21 05:20:05.535 W/dalvikvm( 6080): threadid=1: thread exiting with uncaught exception (group=0x40015578)
09-21 05:20:05.539 E/AndroidRuntime( 6080): FATAL EXCEPTION: main
09-21 05:20:05.539 E/AndroidRuntime( 6080): java.lang.IllegalStateException: play() called on uninitialized AudioTrack.
09-21 05:20:05.539 E/AndroidRuntime( 6080): at android.media.AudioTrack.play(AudioTrack.java:824)
09-21 05:20:05.539 E/AndroidRuntime( 6080): at com.android.dial.DialPadScreen.playSound1(DialPadScreen.java:274)
09-21 05:20:05.539 E/AndroidRuntime( 6080): at com.android.dial.DialPadScreen$1$1.run(DialPadScreen.java:248)
09-21 05:20:05.539 E/AndroidRuntime( 6080): at android.os.Handler.handleCallback(Handler.java:587)
09-21 05:20:05.539 E/AndroidRuntime( 6080): at android.os.Handler.dispatchMessage(Handler.java:92)
09-21 05:20:05.539 E/AndroidRuntime( 6080): at android.os.Looper.loop(Looper.java:123)
09-21 05:20:05.539 E/AndroidRuntime( 6080): at android.app.ActivityThread.main(ActivityThread.java:3687)
09-21 05:20:05.539 E/AndroidRuntime( 6080): at java.lang.reflect.Method.invokeNative(Native Method)
09-21 05:20:05.539 E/AndroidRuntime( 6080): at java.lang.reflect.Method.invoke(Method.java:507)
09-21 05:20:05.539 E/AndroidRuntime( 6080): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:842)
09-21 05:20:05.539 E/AndroidRuntime( 6080): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
09-21 05:20:05.539 E/AndroidRuntime( 6080): at dalvik.system.NativeStart.main(Native Method)
09-21 05:20:05.542 E/ ( 133): Dumpstate > /data/log/dumpstate_app_error
09-21 05:20:05.542 W/ActivityManager( 133): Force finishing activity com.android.dial/.DialPadScreen
我后打印audioTrack，直到21时，我获得价值1（STATE_INITIALIZED）的状态，我得到值'0'（STATE_UNINITIALIZED）。不知道为什么，状态得到改变。
I am printing the state of the "audioTrack" till 21th time I am getting value 1 (STATE_INITIALIZED) after that I am getting value '0' (STATE_UNINITIALIZED). Dont know why state is getting changed.
请帮我什么，我需要做的prevent这个力的确定关闭问题在我的应用程序的变化。
或请建议，如果有任何替代做到这一点。
Please help me what are the changes I need to do prevent this froce close issue in my app. or Please suggest if there's any alternative to do this.
推荐答案
关于21成功生成色调的数量和接下来的失败，我认为你必须释放previously创建的实例调用 audioTrack .release（）方法。
为了避免在 IllegalStateException异常：
创建后 AudioTrack 的一个实例，你必须测试它是否很好初始化。
使用 MODE_STATIC 模式下，如果它不能正常初始化，国家将： STATE_UNINITIALIZED ，
相反，如果正确初始化： STATE_NO_STATIC_DATA ，当你调用write方法的状态将被更改为 STATE_INITIALIZED
使用 MODE_STREAM 模式下，如果它不能正常初始化，国家将： STATE_UNINITIALIZED ，
相反，如果正确初始化： STATE_INITIALIZED 。
结果
阅读 AudioTrack 来源我看到。我想是因为通过构造函数返回的对象是无法使用，因为它是不可能建设后，初始化，这是很奇怪的。
About the number of 21 successfully generated tones and next fails, I think you have to free the previously created instances invoking audioTrack.release() method.
In order to avoid the IllegalStateException:
After created an instance of AudioTrack you have to test if it is well initialized.
Using MODE_STATIC mode, if it does not correctly initialize, the state will be: STATE_UNINITIALIZED,
instead, if correctly initialized: STATE_NO_STATIC_DATA, when you invoke write method the state will be changed to STATE_INITIALIZED.
Using MODE_STREAM mode, if it does not correctly initialize, the state will be: STATE_UNINITIALIZED,
instead, if correctly initialized: STATE_INITIALIZED.
Reading on source of AudioTrack I seen that. I think this is very strange because the object returned by constructor is not usable because it is not possible to initialize after construction.
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