为什么xamarin MediaPlayer(在Xamarin.Android上)可以像这样的链接播放音频(mediaUrl1): https://ia800806.us.archive.org/15/items/Mp3Playlist_555/AaronNeville-CrazyLove.mp3
但是不能通过这样的链接(mediaUrl2)来做到这一点: http://api-streaming.youscribe.com/v1/products/2919465/documents/3214936/audio/stream
private MediaPlayer player;
//..
player = new MediaPlayer();
player.SetAudioStreamType(Stream.Music);
//..
await player.SetDataSourceAsync(ApplicationContext, Android.Net.Uri.Parse(mediaUrl));
//..
player.PrepareAsync();
//..
有没有办法在没有(当然)首先下载文件的情况下播放上面的链接(mediaUrl2)?
以下是我正在使用的样本的完整source。任何帮助将不胜感激。
答案 0 :(得分:5)
http://api-streaming.youscribe.com/v1/products/2919465/documents/3214936/audio/stream
这是一个HTTP mpga
流,并不是我所知道的任何Android API直接支持的,因此MediaPlayer
不支持(请参阅Android Support Media Formats进一步阅读)。
您可以查看logcat
代码的MediaPlayer
输出,您会看到如下输出:
[MediaPlayerNative] start called in state 4, mPlayer(0x8efb7240)
[MediaPlayerNative] error (-38, 0)
[MediaPlayer] Error (-38,0)
[MediaHTTPConnection] readAt 1161613 / 32768 => java.net.ProtocolException
[MediaHTTPConnection] readAt 1161613 / 32768 => java.net.ProtocolException
[MediaPlayerNative] error (1, -2147483648)
[MediaPlayer] Error (1,-2147483648)
Google的Android ExoPlayer可以正确地传输该媒体格式。
这是ExoPlayer的非常简单且非常粗糙的示例,但它会告诉您它确实播放了该流:
var mediaUrl = "http://api-streaming.youscribe.com/v1/products/2919465/documents/3214936/audio/stream";
var mediaUri = Android.Net.Uri.Parse(mediaUrl);
var userAgent = Util.GetUserAgent(this, "ExoPlayerDemo");
var defaultHttpDataSourceFactory = new DefaultHttpDataSourceFactory(userAgent);
var defaultDataSourceFactory = new DefaultDataSourceFactory(this, null, defaultHttpDataSourceFactory);
var extractorMediaSource = new ExtractorMediaSource(mediaUri, defaultDataSourceFactory, new DefaultExtractorsFactory(), null, null);
var defaultBandwidthMeter = new DefaultBandwidthMeter();
var adaptiveTrackSelectionFactory = new AdaptiveTrackSelection.Factory(defaultBandwidthMeter);
var defaultTrackSelector = new DefaultTrackSelector(adaptiveTrackSelectionFactory);
exoPlayer = ExoPlayerFactory.NewSimpleInstance(this, defaultTrackSelector);
exoPlayer.Prepare(extractorMediaSource);
exoPlayer.PlayWhenReady = true;
注意:exoPlayer
是SimpleExoPlayer
类型
注意:这是使用Xamarin.Android
包
Xam.Plugins.Android.ExoPlayer
绑定库