internal CodecStream(IDataReader dataReader, IDataBlockBuilder dataBlockBuilder, QtAtom root)
{
if (dataReader == null)
{
throw new ArgumentNullException("dataReader");
}
if (dataBlockBuilder == null)
{
throw new ArgumentNullException("dataBlockBuilder");
}
if (root == null)
{
throw new ArgumentNullException("root");
}
_dataReader = dataReader;
_dataBlockBuilder = dataBlockBuilder;
_root = root;
_moov = _root.FindChild(AtomName.Movie);
_mdat = _root.FindChild(AtomName.MediaData);
_fileOffset = _root.FirstChild.Offset;
if (_mdat == null)
{
_mdatChunk = new Chunk(((QtAtom)_root.GetLastDescendant()).Offset - _fileOffset, 0);
}
else
{
_mdatChunk = new Chunk(_mdat.Offset - _fileOffset + 8, (_mdat.Length - 8));
}
_mdatMaxUnparsedBytes = (uint)QtDetector.Configurable[QtDetector.ConfigurationKey.MediaDateMaxUnparsedBytes];
}
private static string GetCodecStreamName(QtAtom track, QtAtom sampleDescription, bool isPartial)
{
var sb = new StringBuilder();
if (track != null)
{
// Report the track ID
var trackHeader = track.FindChild(AtomName.TrackHeader) as TrackHeader;
if (trackHeader != null)
{
sb.AppendFormat(CultureInfo.CurrentCulture, "Track {0}", trackHeader.TrackID);
}
if (isPartial)
{
sb.Append(" [Partial]");
}
// Report the handler type (audio/video) and the handler component name
var handlerReference = track.FindChild(AtomName.HandlerReference, true) as HandlerReference;
if (handlerReference != null)
{
sb.AppendFormat(CultureInfo.CurrentCulture, ", {0}", handlerReference.ComponentSubType);
if (!string.IsNullOrEmpty(handlerReference.ComponentName))
{
sb.AppendFormat(CultureInfo.CurrentCulture, ", {0}", handlerReference.ComponentName);
}
}
}
else if (isPartial)
{
sb.Append("[Partial]");
}
// Report the codec name + description
if ((sampleDescription != null) && sampleDescription.HasChildren())
{
string typeName = Enum.GetName(typeof(QtAtom.Attribute), QtAtom.Attribute.Type);
string dataFormat = sampleDescription.Children[0].FindAttributeByName(typeName).ValueAsString;
if (!string.IsNullOrEmpty(dataFormat))
{
sb.AppendFormat(CultureInfo.CurrentCulture, ", {0}", dataFormat);
sb.AppendDescriptiveCodecName(dataFormat);
}
}
return(sb.ToString());
}
private IDataPacket GetExtraData(IDataReader dataReader)
{
if (_sampleDescription != null)
{
var esds = _sampleTable.FindChild(AtomName.ElementaryStreamDescriptor, true) as ElementaryStreamDescriptor;
if (esds != null)
{
return(esds.ExtraData);
}
var avcC = _sampleTable.FindChild(AtomName.AvcConfigurationBox, true) as AvcConfigurationBox;
if (avcC != null)
{
return(avcC.ExtraData);
}
}
return(null);
}
private T GetRequiredAtom <T>(QtAtom parent, AtomName atomName, bool recursive) where T : QtAtom
{
T atom = (parent == null) ? null : parent.FindChild(atomName, recursive) as T;
if (atom == null)
{
_requiredAtomsMissing = true;
}
return(atom);
}
/// <summary>
/// Locates the handler reference and verifies that the given
/// <paramref name="componentSubType"/> is correct for this
/// sample description.
/// </summary>
/// <param name="componentSubType">the component sub-type</param>
/// <returns>true if the component sub-type is valid, false otherwise</returns>
protected bool CheckComponentSubType(ComponentSubType componentSubType)
{
QtAtom media = FindParent(AtomName.Media);
if (media != null)
{
HandlerReference handlerReference = media.FindChild(AtomName.HandlerReference) as HandlerReference;
if (handlerReference != null && handlerReference.ComponentSubType != componentSubType)
{
return(false);
}
}
return(true);
}