/// <summary>
/// Parses boxes for a specified range, looking for tags.
/// </summary>
/// <param name="start">
/// A <see cref="long" /> value specifying the seek position
/// at which to start reading.
/// </param>
/// <param name="end">
/// A <see cref="long" /> value specifying the seek position
/// at which to stop reading.
/// </param>
/// <param name="parents">
/// A <see cref="T:List" /> of <see cref="BoxHeader" /> parents.
/// </param>
private void ParseTag(long start, long end,
List <BoxHeader> parents)
{
BoxHeader header;
for (var position = start;
position < end;
position += header.TotalBoxSize)
{
header = new BoxHeader(file, position);
if (header.BoxType == BoxType.Moov)
{
ParseTag(header.HeaderSize + position,
header.TotalBoxSize + position,
AddParent(parents, header));
}
else if (header.BoxType == BoxType.Mdia ||
header.BoxType == BoxType.Minf ||
header.BoxType == BoxType.Stbl ||
header.BoxType == BoxType.Trak)
{
ParseTag(header.HeaderSize + position,
header.TotalBoxSize + position,
AddParent(parents, header));
}
else if (header.BoxType == BoxType.Udta)
{
var udtaBox = BoxFactory.CreateBox(file,
header) as IsoUserDataBox;
// Since we can have multiple udta boxes, save the parent for each one
var new_parents = AddParent(
parents, header);
udtaBox.ParentTree = new_parents.ToArray();
udta_boxes.Add(udtaBox);
}
else if (header.BoxType == BoxType.Mdat)
{
mdat_start = position;
MdatEndPosition = position + header.TotalBoxSize;
}
if (header.TotalBoxSize == 0)
{
break;
}
}
}
/// <summary>
/// Parses boxes for a specified range, looking for chunk
/// offset boxes.
/// </summary>
/// <param name="start">
/// A <see cref="long" /> value specifying the seek position
/// at which to start reading.
/// </param>
/// <param name="end">
/// A <see cref="long" /> value specifying the seek position
/// at which to stop reading.
/// </param>
private void ParseChunkOffsets(long start, long end)
{
BoxHeader header;
for (var position = start;
position < end;
position += header.TotalBoxSize)
{
header = new BoxHeader(file, position);
if (header.BoxType == BoxType.Moov)
{
ParseChunkOffsets(
header.HeaderSize + position,
header.TotalBoxSize + position);
}
else if (header.BoxType == BoxType.Moov ||
header.BoxType == BoxType.Mdia ||
header.BoxType == BoxType.Minf ||
header.BoxType == BoxType.Stbl ||
header.BoxType == BoxType.Trak)
{
ParseChunkOffsets(
header.HeaderSize + position,
header.TotalBoxSize + position);
}
else if (header.BoxType == BoxType.Stco ||
header.BoxType == BoxType.Co64)
{
stco_boxes.Add(BoxFactory.CreateBox(
file, header));
}
else if (header.BoxType == BoxType.Mdat)
{
mdat_start = position;
MdatEndPosition = position + header.TotalBoxSize;
}
if (header.TotalBoxSize == 0)
{
break;
}
}
}
/// <summary>
/// Parses boxes for a specified range, looking for tags and
/// properties.
/// </summary>
/// <param name="start">
/// A <see cref="long" /> value specifying the seek position
/// at which to start reading.
/// </param>
/// <param name="end">
/// A <see cref="long" /> value specifying the seek position
/// at which to stop reading.
/// </param>
/// <param name="handler">
/// A <see cref="IsoHandlerBox" /> object that applied to the
/// range being searched.
/// </param>
/// <param name="parents">
/// A <see cref="T:List" /> of <see cref="BoxHeader" /> parents.
/// </param>
private void ParseTagAndProperties(long start, long end,
IsoHandlerBox handler, List <BoxHeader> parents)
{
BoxHeader header;
for (var position = start;
position < end;
position += header.TotalBoxSize)
{
header = new BoxHeader(file, position);
var type = header.BoxType;
if (type == BoxType.Moov)
{
ParseTagAndProperties(header.HeaderSize + position,
header.TotalBoxSize + position,
handler,
AddParent(parents, header));
}
else if (type == BoxType.Mdia ||
type == BoxType.Minf ||
type == BoxType.Stbl ||
type == BoxType.Trak)
{
ParseTagAndProperties(
header.HeaderSize + position,
header.TotalBoxSize + position,
handler,
AddParent(parents, header));
}
else if (type == BoxType.Stsd)
{
stsd_boxes.Add(BoxFactory.CreateBox(
file, header, handler));
}
else if (type == BoxType.Hdlr)
{
handler = BoxFactory.CreateBox(file,
header, handler) as
IsoHandlerBox;
}
else if (MovieHeaderBox == null &&
type == BoxType.Mvhd)
{
MovieHeaderBox = BoxFactory.CreateBox(file,
header, handler) as
IsoMovieHeaderBox;
}
else if (type == BoxType.Udta)
{
var udtaBox = BoxFactory.CreateBox(file,
header, handler) as
IsoUserDataBox;
// Since we can have multiple udta boxes, save the parent for each one
var new_parents = AddParent(
parents, header);
udtaBox.ParentTree = new_parents.ToArray();
udta_boxes.Add(udtaBox);
}
else if (type == BoxType.Mdat)
{
mdat_start = position;
MdatEndPosition = position + header.TotalBoxSize;
}
if (header.TotalBoxSize == 0)
{
break;
}
}
}
