private uint CalculateBitrate(TrackFragmentRandomAccessFullBox tfra)
{
var trackSize = tfra.TrackFragmentRandomAccessEntries.Sum(entry => (long)entry.SampleSize); // Track size in bits
var bitrate = ((double)(trackSize * 8) / (double)this.Duration) * (double)this.TimeScale;
return((uint)bitrate);
}
private void BuildVideoTrack(SampleDescriptionFullBox stsd, TrackFragmentRandomAccessFullBox tfra)
{
var vide = stsd.InnerBoxes.SingleOrDefault(b => b.Type == BoxType.Vide) as VisualSampleEntryBox;
var encv = stsd.InnerBoxes.SingleOrDefault(b => b.Type == BoxType.Encv) as ProtectedSampleEntryBox;
if (vide == null && encv != null)
{
vide = encv.OriginalSampleEntryData as VisualSampleEntryBox;
}
if (vide != null)
{
if (tfra != null)
{
this.Bitrate = CalculateBitrate(tfra);
}
this.DisplayWidth = vide.VideoCodecData.DisplayWidth;
this.DisplayHeight = vide.VideoCodecData.DisplayHeight;
this.FourCodecCode = vide.VideoCodecData.FourCodecCode;
this.CodecPrivateData = vide.VideoCodecData.CodecPrivateData;
this.IsSupported = true;
}
}
/// <summary>
/// Initializes a new instance of the <see cref="ManifestTrack"/> class.
/// </summary>
/// <param name="type">The track type.</param>
/// <param name="tkhd">The <see cref="TrackHeaderFullBox"/> with track general information.</param>
/// <param name="tfra">The <see cref="TrackFragmentRandomAccessFullBox"/> with list of fragments corresponding to the track.</param>
/// <param name="stsd">The <see cref="SampleDescriptionFullBox"/> with track codec information.</param>
public ManifestTrack(string type, TrackHeaderFullBox tkhd, MediaHeaderFullBox mdhd, TrackFragmentRandomAccessFullBox tfra, SampleDescriptionFullBox stsd)
{
this.IsSupported = false;
this.Type = (ManifestTrackType)Enum.Parse(typeof(ManifestTrackType), type, true);
this.Id = (int)tkhd.TrackId;
this.Fragments = tfra;
this.Duration = tkhd.Duration;
this.Height = tkhd.Height >> 16;
this.Width = tkhd.Width >> 16;
this.TimeScale = mdhd.Timescale;
this.Language = mdhd.Language;
switch (this.Type)
{
case ManifestTrackType.Video:
BuildVideoTrack(stsd, tfra);
break;
case ManifestTrackType.Audio:
BuildAudioTrack(stsd);
break;
case ManifestTrackType.Text:
BuildSubtitleTrack(stsd);
break;
}
}
