/// <summary>
/// Implements the logic to get the previous AudioTrack instance.
/// </summary>
/// <remarks>
/// The AudioTrack URI determines the source, which can be:
/// (a) Isolated-storage file (Relative URI, represents path in the isolated storage)
/// (b) HTTP URL (absolute URI)
/// (c) MediaStreamSource (null)
/// </remarks>
/// <returns>an instance of AudioTrack, or null if previous track is not allowed</returns>
private AudioTrack GetPreviousTrack(AudioTrack audioTrack, Func <List <GuidToTrackMapping>, AudioTrack, GuidToTrackMapping> definePreviousTrackPredicate)
{
if (definePreviousTrackPredicate == null)
{
throw new ArgumentNullException("definePreviousTrackPredicate");
}
AudioTrack track = null;
if (audioTrack != null && !string.IsNullOrWhiteSpace(audioTrack.Tag))
{
GuidToTrackMapping guidToTrackMapping = definePreviousTrackPredicate(_tracksToGuidMapping, audioTrack);
if (guidToTrackMapping != null)
{
SynoTrack nextTrack = guidToTrackMapping.Track;
// is there a fix we can apply ?
if (_asciiUriFixes.Any(fix => fix.Res == nextTrack.Res))
{
track = _audioTrackFactory.Create(nextTrack, guidToTrackMapping.Guid, _playqueueInformation.Host, _playqueueInformation.Port, _playqueueInformation.Token, _asciiUriFixes.Single(fix => fix.Res == nextTrack.Res).Url);
}
else
{
track = _audioTrackFactory.Create(nextTrack, guidToTrackMapping.Guid, _playqueueInformation.Host, _playqueueInformation.Port, _playqueueInformation.Token);
}
// new AudioTrack(new Uri(nextTrack.Res), nextTrack.Title, nextTrack.Artist, nextTrack.Album, new Uri(nextTrack.AlbumArtUrl), guidToTrackMapping.Guid.ToString(), EnabledPlayerControls.All);
// new AudioTrack(new Uri(nextTrack.Res), nextTrack.Title, nextTrack.Artist, nextTrack.Album, new Uri(nextTrack.AlbumArtUrl), guidToTrackMapping.Guid.ToString(), EnabledPlayerControls.All);
}
}
return(track);
}
/// <summary>
/// Implements the logic to get the next AudioTrack instance.
/// In a playlist, the source can be from a file, a web request, etc.
/// </summary>
/// <param name="audioTrack"></param>
/// <remarks>
/// The AudioTrack URI determines the source, which can be:
/// (a) Isolated-storage file (Relative URI, represents path in the isolated storage)
/// (b) HTTP URL (absolute URI)
/// (c) MediaStreamSource (null)
/// </remarks>
/// <returns>an instance of AudioTrack, or null if the playback is completed</returns>
private AudioTrack GetNextTrack(AudioTrack audioTrack, Func <List <GuidToTrackMapping>, AudioTrack, GuidToTrackMapping> defineNextTrackPredicate)
{
if (defineNextTrackPredicate == null)
{
throw new ArgumentNullException("defineNextTrackPredicate");
}
if (audioTrack != null && !string.IsNullOrWhiteSpace(audioTrack.Tag))
{
GuidToTrackMapping guidToTrackMapping = defineNextTrackPredicate(_tracksToGuidMapping, audioTrack);
if (guidToTrackMapping != null)
{
AudioTrack track;
SynoTrack nextTrack = guidToTrackMapping.Track;
// is there a fix we can apply ?
if (_asciiUriFixes.Any(fix => fix.Res == nextTrack.Res))
{
AsciiUriFix asciiUriFix = this._asciiUriFixes.Single(fix => fix.Res == nextTrack.Res);
if (asciiUriFix.Url == null)
{
throw new NotSupportedException("We knew this day will come eventually : we just imagined that this would not happen anytime soon, so being agile, we didn't implement it yet : we need to support the scenario where a track is started from the phone's UI instead of the app's. (AudioPlayer.cs::GetNextTrack()");
}
track = _audioTrackFactory.Create(nextTrack, guidToTrackMapping.Guid, _playqueueInformation.Host, _playqueueInformation.Port, _playqueueInformation.Token, asciiUriFix.Url);
}
else
{
track = _audioTrackFactory.Create(nextTrack, guidToTrackMapping.Guid, _playqueueInformation.Host, _playqueueInformation.Port, _playqueueInformation.Token);
}
// new AudioTrack(new Uri(nextTrack.Res), nextTrack.Title, nextTrack.Artist, nextTrack.Album, new Uri(nextTrack.AlbumArtUrl), guidToTrackMapping.Guid.ToString(), EnabledPlayerControls.All);
// new AudioTrack(new Uri(nextTrack.Res), nextTrack.Title, nextTrack.Artist, nextTrack.Album, new Uri(nextTrack.AlbumArtUrl), guidToTrackMapping.Guid.ToString(), EnabledPlayerControls.All);
return(track);
}
}
// specify the track
return(null);
}
public void RemoveTracksFromQueue(IEnumerable <Guid> tracksToRemove)
{
// If not using an array, an Invalid Operation Exception will be thrown : something about Movenext, maybe the enumerator is not correctly implemented.
var trackToRemoveArray = tracksToRemove.ToArray();
PlayqueueChangedEventArgs ea = new PlayqueueChangedEventArgs();
var guidToTrackMappings = new GuidToTrackMapping[trackToRemoveArray.Length];
int guidToTrackMappingIndex = 0;
foreach (var guid in trackToRemoveArray)
{
var guidToTrackMapping = _tracksToGuidMapping.Single(o => o.Guid == guid);
_tracksToGuidMapping.Remove(guidToTrackMapping);
guidToTrackMappings[guidToTrackMappingIndex] = guidToTrackMapping;
guidToTrackMappingIndex++;
}
ea.RemovedItems = guidToTrackMappings;
this.OnTracksInQueueChanged(ea);
}
