问题描述
我正在使用Exoplayer,尝试播放字节数组中的音频文件.我正在尝试使用ByteArrayDataSource,但是在调用构造函数时出现错误: new ByteArrayDataSource(data);
这是我想出的代码:
Using Exoplayer, I'm trying to play an audio file from a byte array. I'm trying to use the ByteArrayDataSource, but am getting an error when calling the constructor: new ByteArrayDataSource(data);
Here is the code I've come up with:
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);
}
我得到的错误是:
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ByteArrayDataSource的构造函数,并说传递给它的数据为null,这不是我在调用它之前检查的,并且该数组中有14002427个字节.
The error seems to come from the constructor of ByteArrayDataSource and is saying that the data passed to it is null, which it isn't as I check before calling it and there are 14002427 bytes in that array.
/**
* @param data The data to be read.
*/
public ByteArrayDataSource(byte[] data) {
Assertions.checkNotNull(data);
Assertions.checkArgument(data.length > 0);
this.data = data;
}
我在做什么错了,我该如何解决?有没有人通过传递字节数组作为源来使用Exoplayer播放音频文件的有效示例?
推荐答案
class UriByteDataHelper {
public Uri getUri(byte[] data) {
try {
URL url = new URL(null, "bytes:///" + "audio", new BytesHandler(data));
return Uri.parse( url.toURI().toString());
} catch (MalformedURLException e) {
throw new RuntimeException(e);
} catch (URISyntaxException e) {
throw new RuntimeException(e);
}
}
class BytesHandler extends URLStreamHandler {
byte[] mData;
public BytesHandler(byte[] data) {
mData = data;
}
@Override
protected URLConnection openConnection(URL u) throws IOException {
return new ByteUrlConnection(u, mData);
}
}
class ByteUrlConnection extends URLConnection {
byte[] mData;
public ByteUrlConnection(URL url, byte[] data) {
super(url);
mData = data;
}
@Override
public void connect() throws IOException {
}
@Override
public InputStream getInputStream() throws IOException {
return new ByteArrayInputStream(mData);
}
}
}
private void prepareExoPlayerFromByteArray(byte[] data){
exoPlayer = ExoPlayerFactory.newSimpleInstance(this, new DefaultTrackSelector(null), new DefaultLoadControl());
exoPlayer.addListener(eventListener);
final MByteArrayDataSource byteArrayDataSource = new MByteArrayDataSource(data);
Log.i(TAG,"ByteArrayDataSource constructed.");
Uri audioByteUri = new UriByteDataHelper().getUri(data);
DataSpec dataSpec = new DataSpec(audioByteUri);
try {
byteArrayDataSource.open(dataSpec);
} catch (IOException e) {
e.printStackTrace();
}
DataSource.Factory factory = new DataSource.Factory() {
@Override
public DataSource createDataSource() {
return byteArrayDataSource;
}
};
Log.i(TAG,"DataSource.Factory constructed.");
MediaSource audioSource = new ExtractorMediaSource(audioByteUri,
factory, new DefaultExtractorsFactory(),null,null);
Log.i(TAG,"Audio source constructed.");
exoPlayer.prepare(audioSource);
initMediaControls();
}
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