// Appends to `samples'.
// Returns nextStartTime.
private static ulong ParseFragment(Fragment fragment, IList <MediaSample> samples, MediaStreamType type,
ulong chunkStartTime)
{
// A fragment is a ``chunk'' (with a corresponding <c d=....> in its duration) in the ISM manifest file.
TrackFragmentBox traf = fragment.moof.traf;
if (traf.tfxd != null)
{
chunkStartTime = traf.tfxd.FragmentAbsoluteTime;
}
ulong nextStartTime = 0uL;
if (traf.tfrf != null && traf.tfrf.Array.Length > 0u)
{
nextStartTime = traf.tfrf.Array[0].FragmentAbsoluteTime;
}
long sampleOffset = fragment.mdat.Start;
uint defaultSampleSize = traf.tfhd.default_sample_size;
uint sampleSize = defaultSampleSize;
uint defaultSampleDuration = traf.tfhd.default_sample_duration;
uint duration = defaultSampleDuration;
ulong totalDuration = 0;
uint sampleCount = traf.trun.sample_count;
TrackRunBox.Element[] array = defaultSampleSize == 0u || defaultSampleDuration == 0u ? traf.trun.array : null;
for (uint i = 0; i < sampleCount; ++i)
{
if (defaultSampleSize == 0u)
{
sampleSize = array[i].sample_size;
}
if (defaultSampleDuration == 0u)
{
duration = array[i].sample_duration;
}
// We add a few dozen MediaSample entries for a chunk.
samples.Add(new MediaSample(sampleOffset, (int)sampleSize, chunkStartTime,
/*isKeyFrame:*/ i == 0 || type == MediaStreamType.Audio));
chunkStartTime += (ulong)duration;
totalDuration += (ulong)duration;
sampleOffset += sampleSize;
}
return(nextStartTime != 0uL ? nextStartTime : chunkStartTime);
}
/// <inheritdoc />
/// <summary>
/// </summary>
/// <param name="bytes"></param>
/// <param name="start"></param>
/// <param name="finish"></param>
public MovieFragmentBox(byte[] bytes, int start, int finish) : base(Mp4Identifier.Moof)
{
while (start < finish)
{
var mp4Box = Mp4Utils.GetBox(bytes, ref start, finish);
switch (mp4Box?.Mp4Identifier)
{
case null:
continue;
case Mp4Identifier.Traf:
TrackFragmentBox = mp4Box as TrackFragmentBox;
break;
case Mp4Identifier.Mfhd:
MovieFragmentHeaderBox = mp4Box as MovieFragmentHeaderBox;
break;
}
}
}