internal ShoutcastStream(Uri serverUrl, ShoutcastStreamFactoryConnectionSettings settings, SocketWrapper socketWrapper)
{
this.socket = socketWrapper;
this.serverUrl = serverUrl;
this.serverSettings = settings;
StationInfo = new ServerStationInfo();
AudioInfo = new ServerAudioInfo();
cancelTokenSource = new CancellationTokenSource();
//MediaStreamSource = new MediaStreamSource(null);
streamProcessor = new ShoutcastStreamProcessor(this, socket);
}
public ShoutcastMediaSourceStream(Uri url, ShoutcastServerType stationServerType = ShoutcastServerType.Shoutcast, string relativePath = ";", bool getMetadata = true)
{
StationInfo = new ShoutcastStationInfo();
streamUrl = url;
serverType = stationServerType;
socket = new StreamSocket();
AudioInfo = new ServerAudioInfo();
ShouldGetMetadata = getMetadata;
this.relativePath = relativePath;
}
private async Task <AudioEncodingProperties> ParseEncodingFromMediaAsync()
{
//grab the first frame and strip it for information
AudioEncodingProperties obtainedProperties = null;
IBuffer buffer = null;
if (AudioInfo.AudioFormat == StreamAudioFormat.AAC)
{
//obtainedProperties = AudioEncodingProperties.CreateAac(0, 2, 0);
throw new Exception("Not supported.");
}
var provider = AudioProviderFactory.GetAudioProvider(AudioInfo.AudioFormat);
ServerAudioInfo firstFrame = await provider.GrabFrameInfoAsync(streamProcessor, AudioInfo).ConfigureAwait(false);
//loop until we receive a few "frames" with identical information.
while (true)
{
cancelTokenSource.Token.ThrowIfCancellationRequested();
ServerAudioInfo secondFrame = await provider.GrabFrameInfoAsync(streamProcessor, AudioInfo).ConfigureAwait(false);
if (firstFrame.BitRate == secondFrame.BitRate &&
firstFrame.SampleRate == secondFrame.SampleRate)
{
//both frames are identical, use one of them and escape the loop.
AudioInfo = firstFrame;
break;
}
else
{
//frames aren't identical, get rid of the first one using the second frame and loop back.
firstFrame = secondFrame;
continue;
}
}
cancelTokenSource.Token.ThrowIfCancellationRequested();
if (AudioInfo.AudioFormat == StreamAudioFormat.MP3)
{
//skip the entire first frame/sample to get back on track
await socket.LoadAsync(MP3Parser.mp3_sampleSize - MP3Parser.HeaderLength);
buffer = await socket.ReadBufferAsync(MP3Parser.mp3_sampleSize - MP3Parser.HeaderLength);
//streamProcessor.byteOffset += MP3Parser.mp3_sampleSize - MP3Parser.HeaderLength;
obtainedProperties = AudioEncodingProperties.CreateMp3((uint)AudioInfo.SampleRate, (uint)AudioInfo.ChannelCount, AudioInfo.BitRate);
}
else if (AudioInfo.AudioFormat == StreamAudioFormat.AAC_ADTS)
{
//skip the entire first frame/sample to get back on track
await socket.LoadAsync(AAC_ADTSParser.aac_adts_sampleSize - AAC_ADTSParser.HeaderLength);
buffer = await socket.ReadBufferAsync(AAC_ADTSParser.aac_adts_sampleSize - AAC_ADTSParser.HeaderLength);
//streamProcessor.byteOffset += AAC_ADTSParser.aac_adts_sampleSize - AAC_ADTSParser.HeaderLength;
obtainedProperties = AudioEncodingProperties.CreateAacAdts((uint)AudioInfo.SampleRate, (uint)AudioInfo.ChannelCount, AudioInfo.BitRate);
}
else
{
throw new Exception("Unsupported format.");
}
if (serverSettings.RequestSongMetdata)
{
streamProcessor.metadataPos += buffer.Length; //very important or it will throw everything off!
}
return(obtainedProperties);
}