private static async Task <IList <Box> > GetBoxesAsync(Uri uri, WebRequestor.Range range)
{
using (var stream = await WebRequestor.GetStreamRangeAsync(uri, range))
{
using (var reader = new BoxBinaryReader(stream))
{
return(reader.GetAllBoxes());
}
}
}
public static async Task <DashManifestConversionResult> ConvertToSmoothManifest(XDocument source, Uri rootUri)
{
var result = new DashManifestConversionResult();
SmoothStreamingMedia manifest = new SmoothStreamingMedia();
result.Manifest = manifest;
var mpd = MPDFactory.LoadMPD(source.Root);
// Get Duration
if (mpd.MediaPresentationDuration.HasValue)
{
manifest.Duration = (ulong)mpd.MediaPresentationDuration.Value.Ticks;
}
manifest.IsLive = (mpd.Type == Presentation.Dynamic);
//manifest.LookaheadCount = 2;
if (mpd.AvailabilityEndTime.HasValue && mpd.AvailabilityStartTime.HasValue)
{
manifest.DVRWindowLength = (ulong)mpd.AvailabilityEndTime.Value.Subtract(mpd.AvailabilityStartTime.Value).Ticks;
}
foreach (var period in mpd.Period)
{
foreach (var adaptationSet in period.AdaptationSet)
{
SmoothStreamingMediaStreamIndex streamIndex = null;
int representationIndex = 0;
foreach (var representation in adaptationSet.Representation)
{
string mediaUrl = null;
Uri initializationUri = null;
WebRequestor.Range initializationRange = null;
if (adaptationSet.SegmentTemplate != null)
{
var segmentTemplate = adaptationSet.SegmentTemplate;
var initializationTemplateUrl = segmentTemplate.InitializationValue;
initializationTemplateUrl = initializationTemplateUrl
.Replace("$$", "$")
.Replace("$RepresentationId$", representation.Id)
.Replace("$Number$", representationIndex.ToString())
.Replace("$Bandwidth$", representation.Bandwidth.ToString());
initializationUri = new Uri(rootUri, initializationTemplateUrl);
mediaUrl = segmentTemplate.Media
.Replace("$$", "$")
.Replace("$Bandwidth$", "{bitrate}")
.Replace("$Time$", "{start time}");
}
else if (representation.SegmentBase != null)
{
var baseUrl = representation.BaseURL.First().Value;
var segmentBase = representation.SegmentBase;
if (segmentBase.Initialization != null)
{
if (!string.IsNullOrEmpty(segmentBase.Initialization.SourceURL))
{
initializationUri = new Uri(rootUri, segmentBase.Initialization.SourceURL);
}
initializationRange = WebRequestor.Range.FromString(segmentBase.Initialization.Range);
}
if (initializationUri == null)
{
initializationUri = new Uri(rootUri, baseUrl);
}
}
else
{
throw new NotImplementedException();
}
var initializationBoxes = await GetBoxesAsync(initializationUri, initializationRange);
if (manifest.Protection == null) // support for CENC encryption
{
var moov = initializationBoxes.SingleOrDefault(b => b.Type == BoxType.Moov);
if (moov != null)
{
manifest.Protection = SmoothFactory.GetProtectionHeader(moov);
}
}
var trackStreamIndex = SmoothFactory.GenerateClientManifestStreamIndex(initializationBoxes);
var track = trackStreamIndex.QualityLevel.First();
if (streamIndex != null)
{
track.Index = (uint)streamIndex.QualityLevel.Count; // index is zero based so this is always equal to the current count
streamIndex.QualityLevel.Add(track);
streamIndex.MaxWidth = Math.Max(trackStreamIndex.MaxWidth, streamIndex.MaxWidth);
streamIndex.MaxHeight = Math.Max(trackStreamIndex.MaxHeight, streamIndex.MaxHeight);
streamIndex.DisplayWidth = streamIndex.MaxWidth;
streamIndex.DisplayHeight = streamIndex.MaxHeight;
}
else
{
streamIndex = trackStreamIndex;
if (mediaUrl != null)
{
streamIndex.Url = mediaUrl;
}
}
track.Bitrate = representation.Bandwidth;
// create chunks
if (adaptationSet.SegmentTemplate != null)
{
if (adaptationSet.SegmentTemplate.SegmentTimeline != null)
{
if (!streamIndex.c.Any())
{
streamIndex.c.AddRange(CreateChunks(adaptationSet.SegmentTemplate.SegmentTimeline));
if (!manifest.IsLive)
{
streamIndex.Chunks = (uint)streamIndex.c.Count;
}
}
}
else
{
throw new NotImplementedException();
}
}
else if (representation.SegmentBase != null)
{
// TODO:/OPTIMIZE: request at the same time as initialization header
var segmentBase = representation.SegmentBase;
var indexRange = segmentBase.IndexRange.Split('-').Select(r => long.Parse(r)).ToArray();
var baseUrl = representation.BaseURL.First().Value;
var segmentIndexUri = new Uri(rootUri, baseUrl);
var segmentIndexRange = WebRequestor.Range.FromString(segmentBase.IndexRange);
var segmentIndexBoxes = await GetBoxesAsync(segmentIndexUri, segmentIndexRange);
var sidx = segmentIndexBoxes.OfType <SegmentIndexBox>().First();
// remove the track if the sidx durations don't match the chunk durations.
//if (streamIndex.c.Any() && sidx.Subsegments.First().Duration != streamIndex.c.First().d)
//{
// streamIndex.QualityLevel.Remove(track);
// break;
//}
track.Bitrate = CalculateBitrate(sidx);
if (!streamIndex.c.Any())
{
streamIndex.c.AddRange(CreateChunks(sidx));
if (!manifest.IsLive)
{
streamIndex.Chunks = (uint)streamIndex.c.Count;
}
}
foreach (var kvp in GetChunkLookups(streamIndex, track, segmentIndexUri, sidx))
{
result.ChunkLookup.Add(kvp.Key, kvp.Value);
}
}
else
{
throw new NotImplementedException();
}
representationIndex++;
}
manifest.StreamIndex.Add(streamIndex);
}
}
return(result);
}