android – 使用Exoplayer从Icecast流中提取元数据

从Mediaplayer切换到一个简单的实现Exoplayer我注意到加载时间大大改善,但我想知道是否有任何内置功能,如流式音频时元数据更改侦听器？

我使用一个简单的例子实现了Exoplayer,如下所示：

    Uri uri = Uri.parse(url);
    DefaultSampleSource sampleSource =
            new DefaultSampleSource(new FrameworkSampleExtractor(context, uri, null), 2);
    TrackRenderer audioRenderer = new MediaCodecAudioTrackRenderer(sampleSource);
    mExoPlayerInstance.prepare(audioRenderer);
    mExoPlayerInstance.setPlayWhenReady(true);

解决方法:

我有一个从IceCast Stream启动ExoPlayer的AsyncTask：

OkHttpClient okHttpClient = new OkHttpClient();

UriDataSource uriDataSource = new OkHttpDataSource(okHttpClient, userAgent, null, null, CacheControl.FORCE_NETWORK);
((OkHttpDataSource) uriDataSource).setRequestProperty("Icy-MetaData", "1");
((OkHttpDataSource) uriDataSource).setPlayerCallback(mPlayerCallback);

DataSource dataSource = new DefaultUriDataSource(context, null, uriDataSource);

ExtractorSampleSource sampleSource = new ExtractorSampleSource(uri, dataSource, allocator,
                    BUFFER_SEGMENT_COUNT * BUFFER_SEGMENT_SIZE);


MediaCodecAudioTrackRenderer audioRenderer = new MediaCodecAudioTrackRenderer(sampleSource,
MediaCodecSelector.DEFAULT, null, true, null, null,
AudioCapabilities.getCapabilities(context), AudioManager.STREAM_MUSIC);
mPlayerCallback.playerStarted();
exoPlayer.prepare(audioRenderer);

OkHttpDataSource是使用OkHttpClient实现HttpDataSource的类.它创建InputStream作为请求的响应.我从AACDecoder库https://github.com/vbartacek/aacdecoder-android/blob/master/decoder/src/com/spoledge/aacdecoder/IcyInputStream.java中包含了这个类,并根据响应将InputStream替换为IcyInputStream：

(在OkHttpDataSource的open()中)

try {
  response = okHttpClient.newCall(request).execute();
  responseByteStream = response.body().byteStream();

  String icyMetaIntString = response.header("icy-metaint");
  int icyMetaInt = -1;
  if (icyMetaIntString != null) {
    try {
      icyMetaInt = Integer.parseInt(icyMetaIntString);
      if (icyMetaInt > 0)
        responseByteStream = new IcyInputStream(responseByteStream, icyMetaInt, playerCallback);
    } catch (Exception e) {
      Log.e(TAG, "The icy-metaint '" + icyMetaInt + "' cannot be parsed: '" + e);
    }
  }

} catch (IOException e) {
  throw new HttpDataSourceException("Unable to connect to " + dataSpec.uri.toString(), e,
      dataSpec);
}

现在IcyInputStream可以捕获medatada并调用回调对象(此处为playerCallback). PlayerCallback也来自AACDecoder库：https://github.com/vbartacek/aacdecoder-android/blob/b58c519a341340a251f3291895c76ff63aef5b94/decoder/src/com/spoledge/aacdecoder/PlayerCallback.java

这样你就不会制作任何重复的流而且它是单数的.如果您不想在项目中使用AACDecoder库,那么您只需复制所需的文件并将它们直接包含在项目中.

标签：android,exoplayer,metadata,icecast
来源： https://codeday.me/bug/20191007/1866489.html