/// <summary>
/// Constructs and initializes a new instance of <see
/// cref="IsoHandlerBox" /> with a provided header and
/// handler by reading the contents from a specified file.
/// </summary>
/// <param name="header">
/// A <see cref="BoxHeader" /> object containing the header
/// to use for the new instance.
/// </param>
/// <param name="file">
/// A <see cref="TagLib.File" /> object to read the contents
/// of the box from.
/// </param>
/// <param name="handler">
/// A <see cref="IsoHandlerBox" /> object containing the
/// handler that applies to the new instance.
/// </param>
/// <exception cref="ArgumentNullException">
/// <paramref name="file" /> is <see langword="null" />.
/// </exception>
public IsoHandlerBox(BoxHeader header, TagLib.File file,
IsoHandlerBox handler)
: base(header, file, handler)
{
if (file == null)
{
throw new System.ArgumentNullException("file");
}
file.Seek(DataPosition + 4);
ByteVector box_data = file.ReadBlock(DataSize - 4);
handler_type = box_data.Mid(0, 4);
int end = box_data.Find((byte)0, 16);
if (end < 16)
{
end = box_data.Count;
}
name = box_data.ToString(StringType.UTF8, 16, end - 16);
}
/// <summary>
/// Constructs and initializes a new instance of <see
/// cref="IsoMovieHeaderBox" /> with a provided header and
/// handler by reading the contents from a specified file.
/// </summary>
/// <param name="header">
/// A <see cref="BoxHeader" /> object containing the header
/// to use for the new instance.
/// </param>
/// <param name="file">
/// A <see cref="TagLib.File" /> object to read the contents
/// of the box from.
/// </param>
/// <param name="handler">
/// A <see cref="IsoHandlerBox" /> object containing the
/// handler that applies to the new instance.
/// </param>
/// <exception cref="ArgumentNullException">
/// <paramref name="file" /> is <see langword="null" />.
/// </exception>
public IsoMovieHeaderBox(BoxHeader header, TagLib.File file,
IsoHandlerBox handler)
: base(header, file, handler)
{
if (file == null)
{
throw new ArgumentNullException("file");
}
int bytes_remaining = DataSize;
ByteVector data;
if (Version == 1)
{
// Read version one (large integers).
data = file.ReadBlock(Math.Min(28,
bytes_remaining));
if (data.Count >= 8)
{
creation_time = data.Mid(0,
8).ToULong();
}
if (data.Count >= 16)
{
modification_time = data.Mid(8,
8).ToULong();
}
if (data.Count >= 20)
{
timescale = data.Mid(16, 4).ToUInt();
}
if (data.Count >= 28)
{
duration = data.Mid(20, 8).ToULong();
}
bytes_remaining -= 28;
}
else
{
// Read version zero (normal integers).
data = file.ReadBlock(Math.Min(16,
bytes_remaining));
if (data.Count >= 4)
{
creation_time = data.Mid(0,
4).ToUInt();
}
if (data.Count >= 8)
{
modification_time = data.Mid(4,
4).ToUInt();
}
if (data.Count >= 12)
{
timescale = data.Mid(8, 4).ToUInt();
}
if (data.Count >= 16)
{
duration = data.Mid(12, 4).ToUInt();
}
bytes_remaining -= 16;
}
data = file.ReadBlock(Math.Min(6, bytes_remaining));
if (data.Count >= 4)
{
rate = data.Mid(0, 4).ToUInt();
}
if (data.Count >= 6)
{
volume = data.Mid(4, 2).ToUShort();
}
file.Seek(file.Tell + 70);
bytes_remaining -= 76;
data = file.ReadBlock(Math.Min(4,
bytes_remaining));
if (data.Count >= 4)
{
next_track_id = data.Mid(0, 4).ToUInt();
}
}
/// <summary>
/// Constructs and initializes a new instance of <see
/// cref="IsoMetaBox" /> with a provided header and
/// handler by reading the contents from a specified file.
/// </summary>
/// <param name="header">
/// A <see cref="BoxHeader" /> object containing the header
/// to use for the new instance.
/// </param>
/// <param name="file">
/// A <see cref="TagLib.File" /> object to read the contents
/// of the box from.
/// </param>
/// <param name="handler">
/// A <see cref="IsoHandlerBox" /> object containing the
/// handler that applies to the new instance.
/// </param>
/// <exception cref="ArgumentNullException">
/// <paramref name="file" /> is <see langword="null" />.
/// </exception>
public IsoMetaBox(BoxHeader header, TagLib.File file,
IsoHandlerBox handler)
: base(header, file, handler)
{
children = LoadChildren(file);
}
/// <summary>
/// Constructs and initializes a new instance of <see
/// cref="Box" /> with a specified header.
/// </summary>
/// <param name="header">
/// A <see cref="BoxHeader" /> object describing the new
/// instance.
/// </param>
protected Box(BoxHeader header) : this(header, null)
{
}
/// <summary>
/// Constructs and initializes a new instance of <see
/// cref="Box" /> with a specified header and handler.
/// </summary>
/// <param name="header">
/// A <see cref="BoxHeader" /> object describing the new
/// instance.
/// </param>
/// <param name="handler">
/// A <see cref="IsoHandlerBox" /> object containing the
/// handler that applies to the new instance, or <see
/// langword="null" /> if no handler applies.
/// </param>
protected Box(BoxHeader header, IsoHandlerBox handler)
{
this.header = header;
this.data_position = header.Position + header.HeaderSize;
this.handler = handler;
}
/// <summary>
/// Saves the changes made in the current instance to the
/// file it represents.
/// </summary>
public override void Save()
{
if (udta_boxes.Count == 0)
{
IsoUserDataBox udtaBox = new IsoUserDataBox();
udta_boxes.Add(udtaBox);
}
// Try to get into write mode.
Mode = File.AccessMode.Write;
try
{
FileParser parser = new FileParser(this);
parser.ParseBoxHeaders();
InvariantStartPosition = parser.MdatStartPosition;
InvariantEndPosition = parser.MdatEndPosition;
long size_change = 0;
long write_position = 0;
// To avoid rewriting udta blocks which might not have been modified,
// the code here will work correctly if:
// 1. There is a single udta for the entire file
// - OR -
// 2. There are multiple utdtas, but only 1 of them contains the Apple ILST box.
// We should be OK in the vast majority of cases
IsoUserDataBox udtaBox = FindAppleTagUdta();
if (null == udtaBox)
{
udtaBox = new IsoUserDataBox();
}
ByteVector tag_data = udtaBox.Render();
// If we don't have a "udta" box to overwrite...
if (udtaBox.ParentTree == null ||
udtaBox.ParentTree.Length == 0)
{
// Stick the box at the end of the moov box.
BoxHeader moov_header = parser.MoovTree[
parser.MoovTree.Length - 1];
size_change = tag_data.Count;
write_position = moov_header.Position +
moov_header.TotalBoxSize;
Insert(tag_data, write_position, 0);
// Overwrite the parent box sizes.
for (int i = parser.MoovTree.Length - 1; i >= 0;
i--)
{
size_change = parser.MoovTree[i
].Overwrite(this, size_change);
}
}
else
{
// Overwrite the old box.
BoxHeader udta_header = udtaBox.ParentTree[udtaBox.ParentTree.Length - 1];
size_change = tag_data.Count -
udta_header.TotalBoxSize;
write_position = udta_header.Position;
Insert(tag_data, write_position,
udta_header.TotalBoxSize);
// Overwrite the parent box sizes.
for (int i = udtaBox.ParentTree.Length - 2; i >= 0;
i--)
{
size_change = udtaBox.ParentTree[i
].Overwrite(this, size_change);
}
}
// If we've had a size change, we may need to adjust
// chunk offsets.
if (size_change != 0)
{
// We may have moved the offset boxes, so we
// need to reread.
parser.ParseChunkOffsets();
InvariantStartPosition = parser.MdatStartPosition;
InvariantEndPosition = parser.MdatEndPosition;
foreach (Box box in parser.ChunkOffsetBoxes)
{
IsoChunkLargeOffsetBox co64 =
box as IsoChunkLargeOffsetBox;
if (co64 != null)
{
co64.Overwrite(this,
size_change,
write_position);
continue;
}
IsoChunkOffsetBox stco =
box as IsoChunkOffsetBox;
if (stco != null)
{
stco.Overwrite(this,
size_change,
write_position);
continue;
}
}
}
TagTypesOnDisk = TagTypes;
}
finally
{
Mode = File.AccessMode.Closed;
}
}
/// <summary>
/// Constructs and initializes a new instance of <see
/// cref="AppleElementaryStreamDescriptor" /> with a provided
/// header and handler by reading the contents from a
/// specified file.
/// </summary>
/// <param name="header">
/// A <see cref="BoxHeader" /> object containing the header
/// to use for the new instance.
/// </param>
/// <param name="file">
/// A <see cref="TagLib.File" /> object to read the contents
/// of the box from.
/// </param>
/// <param name="handler">
/// A <see cref="IsoHandlerBox" /> object containing the
/// handler that applies to the new instance.
/// </param>
/// <exception cref="ArgumentNullException">
/// <paramref name="file" /> is <see langword="null" />.
/// </exception>
/// <exception cref="CorruptFileException">
/// Valid data could not be read.
/// </exception>
public AppleElementaryStreamDescriptor(BoxHeader header,
TagLib.File file,
IsoHandlerBox handler)
: base(header, file, handler)
{
int offset = 0;
ByteVector box_data = file.ReadBlock(DataSize);
decoder_config = new ByteVector();
// Elementary Stream Descriptor Tag
if (box_data[offset++] == 3)
{
// We have a descriptor tag. Check that it's at
// least 20 long.
if (ReadLength(box_data, ref offset) < 20)
{
throw new CorruptFileException(
"Insufficient data present.");
}
es_id = box_data.Mid(offset, 2).ToUShort();
offset += 2;
stream_priority = box_data[offset++];
}
else
{
// The tag wasn't found, so the next two byte
// are the ID, and after that, business as
// usual.
es_id = box_data.Mid(offset, 2).ToUShort();
offset += 2;
}
// Verify that the next data is the Decoder
// Configuration Descriptor Tag and escape if it won't
// work out.
if (box_data[offset++] != 4)
{
throw new CorruptFileException(
"Could not identify decoder configuration descriptor.");
}
// Check that it's at least 15 long.
if (ReadLength(box_data, ref offset) < 15)
{
throw new CorruptFileException(
"Could not read data. Too small.");
}
// Read a lot of good info.
object_type_id = box_data[offset++];
stream_type = box_data[offset++];
buffer_size_db = box_data.Mid(offset, 3).ToUInt();
offset += 3;
max_bitrate = box_data.Mid(offset, 4).ToUInt();
offset += 4;
average_bitrate = box_data.Mid(offset, 4).ToUInt();
offset += 4;
// Verify that the next data is the Decoder Specific
// Descriptor Tag and escape if it won't work out.
if (box_data[offset++] != 5)
{
throw new CorruptFileException(
"Could not identify decoder specific descriptor.");
}
// The rest of the info is decoder specific.
uint length = ReadLength(box_data, ref offset);
decoder_config = box_data.Mid(offset, (int)length);
}
/// <summary>
/// Constructs and initializes a new instance of <see
/// cref="AppleAdditionalInfoBox" /> with a provided header
/// and handler by reading the contents from a specified
/// file.
/// </summary>
/// <param name="header">
/// A <see cref="BoxHeader" /> object containing the header
/// to use for the new instance.
/// </param>
/// <param name="file">
/// A <see cref="TagLib.File" /> object to read the contents
/// of the box from.
/// </param>
/// <param name="handler">
/// A <see cref="IsoHandlerBox" /> object containing the
/// handler that applies to the new instance.
/// </param>
/// <exception cref="ArgumentNullException">
/// <paramref name="file" /> is <see langword="null" />.
/// </exception>
public AppleAdditionalInfoBox(BoxHeader header, TagLib.File file, IsoHandlerBox handler) : base(header, handler)
{
// We do not care what is in this custom data section
// see: https://developer.apple.com/library/mac/#documentation/QuickTime/QTFF/QTFFChap2/qtff2.html
Data = LoadData(file);
}
/// <summary>
/// Constructs and initializes a new instance of <see
/// cref="AppleDataBox" /> with a provided header and handler
/// by reading the contents from a specified file.
/// </summary>
/// <param name="header">
/// A <see cref="BoxHeader" /> object containing the header
/// to use for the new instance.
/// </param>
/// <param name="file">
/// A <see cref="TagLib.File" /> object to read the contents
/// of the box from.
/// </param>
/// <param name="handler">
/// A <see cref="IsoHandlerBox" /> object containing the
/// handler that applies to the new instance.
/// </param>
/// <exception cref="ArgumentNullException">
/// <paramref name="file" /> is <see langword="null" />.
/// </exception>
public AppleDataBox(BoxHeader header, TagLib.File file,
IsoHandlerBox handler)
: base(header, file, handler)
{
Data = LoadData(file);
}
/// <summary>
/// Constructs and initializes a new instance of <see
/// cref="FullBox" /> with a provided header, version, and
/// flags.
/// </summary>
/// <param name="header">
/// A <see cref="BoxHeader" /> object containing the header
/// to use for the new instance.
/// </param>
/// <param name="version">
/// A <see cref="byte" /> value containing the version of the
/// new instance.
/// </param>
/// <param name="flags">
/// A <see cref="byte" /> value containing the flags for the
/// new instance.
/// </param>
protected FullBox(BoxHeader header, byte version, uint flags)
: base(header)
{
this.version = version;
this.flags = flags;
}
/// <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>
private void ParseTagAndProperties(long start, long end,
IsoHandlerBox handler, List <BoxHeader> parents)
{
BoxHeader header;
for (long position = start; position < end;
position += header.TotalBoxSize)
{
header = new BoxHeader(file, position);
ByteVector 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 (mvhd_box == null &&
type == BoxType.Mvhd)
{
mvhd_box = BoxFactory.CreateBox(file,
header, handler) as
IsoMovieHeaderBox;
}
else if (type == BoxType.Udta)
{
IsoUserDataBox udtaBox = BoxFactory.CreateBox(file,
header, handler) as
IsoUserDataBox;
// Since we can have multiple udta boxes, save the parent for each one
List <BoxHeader> new_parents = AddParent(
parents, header);
udtaBox.ParentTree = new_parents.ToArray();
udta_boxes.Add(udtaBox);
}
else if (type == BoxType.Mdat)
{
mdat_start = position;
mdat_end = position + header.TotalBoxSize;
}
if (header.TotalBoxSize == 0)
{
break;
}
}
}
