internal static PlayRange Merge(this IMediaSource mediaSource, PlayRange first, PlayRange second)
{
if (!mediaSource.CanMerge(first, second))
{
throw new InvalidOperationException();
}
first = mediaSource.Adjust(first);
second = mediaSource.Adjust(second);
if (mediaSource.HasNativeDuration())
{
return(PlayRange.Merge(first, second));
}
else
{
return(new PlayRange(first.Duration + second.Duration));
}
}
internal NormalPlaySource(IMediaSource mediaSource, PlayRange range)
{
if (mediaSource == null)
{
throw new ArgumentNullException("mediaSource");
}
range = mediaSource.Adjust(range);
this.MediaSource = mediaSource;
this.PlayRange = range;
}
//public TimeSpan? NativeDuration
//{
// get
// {
// return this.MediaSource.NativeDuration;
// }
//}
public MarkableMediaSource(IMediaSource mediaSource, PlayRange playRange)
{
if (mediaSource == null)
{
throw new ArgumentNullException("mediaSource");
}
var adjustedPlayRange = mediaSource.Adjust(playRange); // 包含对playRange有效性的验证
//MarkableMediaSource markable = mediaSource as MarkableMediaSource;
//if (markable!=null)
//{
// this.MediaSource = markable.MediaSource;
//}
//else
//{
// this.MediaSource = mediaSource;
//}
this.MediaSource = mediaSource;
this.PlayRange = adjustedPlayRange;
}
internal static bool CanMerge(this IMediaSource mediaSource, PlayRange first, PlayRange second)
{
return(mediaSource.HasNativeDuration() ?
PlayRange.IsUnbroken(mediaSource.Adjust(first), mediaSource.Adjust(second)) : true);
}