AudioTrack 的问题
你好，我写了一个程序（在Android NDK上），它通过Java中的JNI提供音频缓冲区。不稳定的问题。有时 AudioTrack 会完美地再现缓冲区，有时会出现以下消息：
08-18 15:13:00.745: INFO/AudioTrack(12457): AudioTrack::setstreamType[3]channels[12]format[1]sampleRate [44100] 08-18 15：13：00.749：INFO/AudioPolicyManager（2381）：setOutputDevice（）输出1设备2延迟Ms 0力：0 08-18 15:13:04.183：信息/音频硬件ALSA（2381）：输出待机已调用！关闭 PCM 设备。
Java 代码如下：
final int bufSize = AudioTrack.getMinBufferSize(44100, AudioFormat.CHANNEL_OUT_STEREO, AudioFormat.ENCODING_PCM_16BIT);
track = new AudioTrack(AudioManager.STREAM_MUSIC, 44100,AudioFormat.CHANNEL_CONFIGURATION_STEREO,AudioFormat.ENCODING_PCM_16BIT, bufSize, AudioTrack.MODE_STREAM);
track.play();
int byt = track.write(buf, 0, length);
此错误可能是什么问题？
Hello I wrote a program (on Android NDK), which gives audio buffer through JNI in Java. The problem of instability. Sometimes AudioTrack perfectly reproduces the buffer, and sometimes there are these messages:
08-18 15:13:00.745: INFO/AudioTrack(12457): AudioTrack::set streamType[3] channels[12] format[1] sampleRate[44100]
08-18 15:13:00.749: INFO/AudioPolicyManager(2381): setOutputDevice() output 1 device 2 delayMs 0 force:0
08-18 15:13:04.183: INFO/AudioHardwareALSA(2381): Output standby called!!. Turn off PCM device.
Code in Java like this:
final int bufSize = AudioTrack.getMinBufferSize(44100, AudioFormat.CHANNEL_OUT_STEREO, AudioFormat.ENCODING_PCM_16BIT);
track = new AudioTrack(AudioManager.STREAM_MUSIC, 44100,AudioFormat.CHANNEL_CONFIGURATION_STEREO,AudioFormat.ENCODING_PCM_16BIT, bufSize, AudioTrack.MODE_STREAM);
track.play();
int byt = track.write(buf, 0, length);
In what may be a problem with this error?
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在调用
track.play之前，您必须先调用track.write并填充最小 bufSize。You have to call
track.writeandf fill the minimum bufSize first beforetrack.playis called.