/// <summary>
/// AdjustTrackSpecsToDestination
/// The purpose of this is to control the recoding by modifying two instances of the class
/// BaseTrackInfo under the two subclasses RawAudioTrackInfo and RawVideoTrackInfo.
/// By default, these subclass instances take on the characteristics of the input media.
/// NOTE: This method should be XML driven or should pick up parameters from a configuration file.
/// FIXME: What about other track types?
/// </summary>
protected void AdjustTrackSpecsToDestination()
{
foreach (IsochronousTrackInfo trackDef in TrackInfo)
{
trackDef.TrackID = 0; // reset track ID (destination stream should determine track ID)
if (trackDef is RawVideoTrackInfo)
{
trackDef.CTTSOut = CTTSOut;
}
}
uint oneSecondTicks = (uint)TimeSpan.TicksPerSecond;
if (DestStream.GetType().FullName.Equals("Media.Formats.MP4.MP4StreamWriter"))
{
TrackInfo.ForEach(delegate(IsochronousTrackInfo trk)
{
// set the movie time scale to 1,000
trk.MovieTimeScale = 1000;
// Set the track time scale to 10,000.
// QuickTime cannot handle ulong durations, and our mp4 writer automatically switches to ulong if
// a movie is more than 2,166,748,000 units long (a value which goes beyond int.MaxValue).
// The track duration can get this high if the time scale is 10,000,000 which is what Expression uses.
trk.TimeScale = 10000;
if (trk is RawVideoTrackInfo)
{
trk.CTTSOut = CTTSOut;
}
else if (trk is RawAudioTrackInfo)
{
// if we are recoding to MP4 from HyperAsset, private codec data should be set as follows
if (SourceStream.GetType().FullName.Contains(".AssetMediaStream")) // This needs to encompass the new AssetMediaStream2 class.
{
trk.CodecPrivateData = "038080220000000480801640150020000001F4000001F4000580800511900000000680800102";
}
}
});
}
else if (DestStream.IsMediaStreamFragmented)
{
TrackInfo.ForEach(delegate(IsochronousTrackInfo trk)
{
if (trk is RawVideoTrackInfo)
{
// modify RawVideoTrackInfo: for fragmented tracks, timescale should be = oneSecondTicks
// rvti.MovieDurationIn100NanoSecs = rvti.MovieDurationIn100NanoSecs * (oneSecondTicks / rvti.MovieTimeScale); // FIXME: what if rvti.MovieTimeScale > oneSecondTicks ticks?
trk.MovieTimeScale = oneSecondTicks;
//rvti.DurationIn100NanoSecs = rvti.DurationIn100NanoSecs * (oneSecondTicks / rvti.TimeScale);
trk.TimeScale = oneSecondTicks;
trk.IsFragment = true;
}
});
}
if (TrackInfo.Any(t => t is RawAudioTrackInfo))
{
RawAudioTrackInfo rati = (RawAudioTrackInfo)TrackInfo.First(t => t is RawAudioTrackInfo);
if ((rati != null) && (audioOrVideoOrBoth == TracksIncluded.Video))
{
TrackInfo.Remove(rati);
rati = null;
}
}
if (audioOrVideoOrBoth == TracksIncluded.Audio)
{
IsochronousTrackInfo rvti;
do
{
rvti = TrackInfo.FirstOrDefault(t => t is RawVideoTrackInfo);
if (rvti != null)
{
TrackInfo.Remove(rvti);
}
} while (rvti != null);
}
}
