使用Exoplayer,我正在尝试从字节数组播放音频文件。我正在尝试使用ByteArrayDataSource,但在调用构造函数时出现错误:new ByteArrayDataSource(data);
以下是我想到的代码:
private void prepareExoPlayerFromByteArray(byte[] data){
exoPlayer = ExoPlayerFactory.newSimpleInstance(this, new DefaultTrackSelector(null), new DefaultLoadControl());
exoPlayer.addListener(eventListener);
final ByteArrayDataSource byteArrayDataSource = new ByteArrayDataSource(data);
/*
DataSpec dataSpec = new DataSpec(byteArrayDataSource.getUri());
try {
byteArrayDataSource.open(dataSpec);
} catch (IOException e) {
e.printStackTrace();
}
*/
DataSource.Factory factory = new DataSource.Factory() {
@Override
public DataSource createDataSource() {
return byteArrayDataSource;
}
};
MediaSource audioSource = new ExtractorMediaSource(byteArrayDataSource.getUri(),
factory, new DefaultExtractorsFactory(),null,null);
exoPlayer.prepare(audioSource);
}
我收到的错误信息如下:
E/ExoPlayerImplInternal: Internal runtime error.
java.lang.NullPointerException
at com.google.android.exoplayer2.util.Assertions.checkNotNull(Assertions.java:107)
at com.google.android.exoplayer2.source.ExtractorMediaPeriod$ExtractingLoadable.<init>(ExtractorMediaPeriod.java:591)
at com.google.android.exoplayer2.source.ExtractorMediaPeriod.startLoading(ExtractorMediaPeriod.java:452)
at com.google.android.exoplayer2.source.ExtractorMediaPeriod.prepare(ExtractorMediaPeriod.java:165)
at com.google.android.exoplayer2.ExoPlayerImplInternal.maybeUpdateLoadingPeriod(ExoPlayerImplInternal.java:1260)
at com.google.android.exoplayer2.ExoPlayerImplInternal.updatePeriods(ExoPlayerImplInternal.java:1102)
at com.google.android.exoplayer2.ExoPlayerImplInternal.doSomeWork(ExoPlayerImplInternal.java:447)
at com.google.android.exoplayer2.ExoPlayerImplInternal.handleMessage(ExoPlayerImplInternal.java:300)
at android.os.Handler.dispatchMessage(Handler.java:98)
at android.os.Looper.loop(Looper.java:234)
at android.os.HandlerThread.run(HandlerThread.java:61)
at com.google.android.exoplayer2.util.PriorityHandlerThread.run(PriorityHandlerThread.java:40)
错误似乎来自于ByteArrayDataSource的构造函数,它说传递给它的数据为null,但在调用它之前我已经检查过了,那个数组中有14002427字节。
/**
* @param data The data to be read.
*/
public ByteArrayDataSource(byte[] data) {
Assertions.checkNotNull(data);
Assertions.checkArgument(data.length > 0);
this.data = data;
}
我做错了什么,怎样才能避免?有没有人有一个播放音频文件的Exoplayer工作示例,可以通过传递字节数组作为源来实现?