/// <summary>
/// Asynchronous public API for getting next stream to play.
/// </summary>
/// <param name="callback"></param>
/// <param name="state"></param>
/// <returns></returns>
public IAsyncResult BeginGetNextStream(AsyncCallback callback, Object state)
{
if (_program == null)
throw new InvalidOperationException("program not set");
if ( IsWebRequestPending() )
throw new InvalidOperationException("operation is already in progress");
_asyncResult = new HLSCallbackImpl(callback);
if (_playlist == null)
{
_playlist = SelectNextVariant();
_playlist.Playback = this;
_currentPosition = 0;
_currentMediaSequenceNumber = 0;
_discontinuity = true;
if (IsEndList || _playlist.PlaylistDuration > _liveDvrMinDuration)
_duration = _playlist.PlaylistDuration;
if (_downloadBitrateChanged != null)
_downloadBitrateChanged(this, _playlist.Bitrate);
}
else
{
_currentPosition++;
_currentMediaSequenceNumber++;
HLSPlaylistImpl newPlaylist = SelectNextVariant();
if (newPlaylist != _playlist)
{
_discontinuity = true;
if (_downloadBitrateChanged != null &&
newPlaylist.Bitrate != _playlist.Bitrate)
_downloadBitrateChanged(this, newPlaylist.Bitrate);
_playlist.Playback = null;
_playlist = newPlaylist;
_playlist.Playback = this;
}
else
{
_discontinuity = false;
}
}
if (!_playlist.IsLoaded)
{
_asyncResult.Purpose = HLSCallbackPurpose.WaitForPlaylist;
_playlist.Load();
return _asyncResult;
}
bool a = _playlist.IsDueForReload;
if (!IsEndList && ((_currentPosition >= _playlist.Streams.Count) || a))
{
_asyncResult.Purpose = HLSCallbackPurpose.WaitForPlaylist;
_playlist.Reload();
return _asyncResult;
}
if (!BeginLoadingNextStream())
{
_asyncResult.Dispose();
_asyncResult = null;
}
return _asyncResult;
}
public void EndPendingWebRequest()
{
if (null != _asyncResult)
{
_asyncResult.Dispose();
_asyncResult = null;
}
}
/// <summary>
/// If a stream download is in progress using HttpWebRequest, then this method will flag
/// that request to discard its download stream. After this call, no more data is
/// pushed into TSDemux or audio/video buffers. Also no new stream download is started
/// after this method is called and until ResumeDownloads is called.
/// </summary>
public void AbortStreamDownloads()
{
lock (_requestLock)
{
_downloadAbortInProgress = true;
if (_currentWebRequestState != null)
{
_currentWebRequestState.DiscardData = true;
_currentWebRequestState.WebRequest.Abort();
_currentWebRequestState = null;
}
if (null != _asyncResult)
{
_asyncResult.Abort();
_asyncResult = null;
}
}
}
