public override void Read(BoxReader reader)
{
using (new SizeChecker(this, reader)) {
long startpos = reader.BaseStream.Position;
base.Read(reader);
reader.ReadUInt16(); // pre_defined = 0;
reader.ReadUInt16(); // reserved = 0;
for (int i = 0; i < 3; i++) reader.ReadUInt32(); // unsigned int(32)[3] pre_defined = 0
Width = reader.ReadUInt16();
Height = reader.ReadUInt16();
HorizResolution = reader.ReadUInt32(); // = 0x0048000 = 72 dpi
VertResolution = reader.ReadUInt32(); // = 0x0048000 = 72 dpi
reader.ReadUInt32(); // reserved = 0
FrameCount = reader.ReadUInt16(); // frame_count = 1
// Compressor name has first 2 bytes which is the readable length, the rest are char's or null bytes
CompressorName = "";
ushort len = reader.ReadUInt16();
// NOTE: Some encoders use only one byte for count of compressor name, so here
// we test for whether the length is valid. If not valid, only the first byte is
// used as the length.
if (len > 30)
{
byte[] b = BitConverter.GetBytes(len);
if (BitConverter.IsLittleEndian)
{
len = (ushort)b[1];
CompressorName += (char)b[0];
}
else
{
len = (ushort)b[0];
CompressorName += (char)b[1];
}
}
for (int i=0; i<30; i++) {
if (i < len)
CompressorName += reader.ReadChar();
else
reader.ReadChar();
}
CompressorName = CompressorName.Trim().Replace("\0","");
Depth = reader.ReadUInt16(); // depth = 0x0018
reader.ReadUInt16(); // pre_defined = -1
bool bOptionalBoxFound = true;
while (bOptionalBoxFound) {
bOptionalBoxFound = false;
long pos = reader.BaseStream.Position;
Box test = new Box(BoxTypes.Any);
test.Read(reader);
reader.BaseStream.Position = pos;
if (test.Type == BoxTypes.CleanApertureBox) {
CleanApertureBox = new CleanApertureBox();
CleanApertureBox.Read(reader);
bOptionalBoxFound = true;
} else
if (test.Type == BoxTypes.PixelAspectRatio) {
PixelAspectRatioBox = new PixelAspectRatioBox();
PixelAspectRatioBox.Read(reader);
bOptionalBoxFound = true;
} else
// retrieve CodecPrivateData from avcC
if (test.Type == BoxTypes.AvcC) {
AvcCBox = new AvcCBox();
AvcCBox.Read(reader);
//if ((ulong) (reader.BaseStream.Position - pos) < this.Size) {
// // klude to work around Expression problem (missing uuid, but box size large enough for it)
// pos = reader.BaseStream.Position;
// test = new Box(BoxTypes.Any);
// test.Read(reader);
// reader.BaseStream.Position = pos;
// if (test.Type == BoxTypes.UUID) {
// Uuid = new UuidBox();
// Uuid.Read(reader);
// }
//}
bOptionalBoxFound = true;
} else
if (test.Type == BoxTypes.UUID) {
Uuid = new UuidBox();
Uuid.Read(reader);
} else
if (test.Type == BoxTypes.Mp4v) {
PrivDataFullBox = new AnyPrivFullBox();
PrivDataFullBox.Read(reader);
bOptionalBoxFound = true;
} else
if (test.Type == BoxTypes.Vc1) {
PrivDataBox = new AnyPrivBox();
PrivDataBox.Read(reader);
bOptionalBoxFound = true;
}
}
}
}
public VisualSampleEntry(BoxType inType, RawVideoTrackInfo trackInfo)
: base(inType)
{
Width = (ushort)trackInfo.Width;
Height = (ushort)trackInfo.Height;
HorizResolution = (uint)0x00480000; // 72 dpi
VertResolution = (uint)0x00480000;
FrameCount = (ushort)1;
this.Size += 34UL;
CompressorName = ""; // "Orions Digital MP4 Recoding";
Depth = (ushort)0x18; // images in color with no alpha
this.Size += 36UL; // compressor name is 30 bytes plus 2 for length, 2 for depth, 2 for reserved
if (trackInfo.PayloadType == VideoPayloadType.avc1)
{
AvcCBox = new AvcCBox();
AvcCBox.CodecPrivateData = trackInfo.CodecPrivateData;
this.Size += AvcCBox.Size;
}
else if (trackInfo.PayloadType == VideoPayloadType.vc1)
{
PrivDataBox = new AnyPrivBox(BoxTypes.Dvc1, trackInfo.CodecPrivateData); // MS ISMV
this.Size += PrivDataBox.Size;
}
else if (trackInfo.PayloadType == VideoPayloadType.mp4v)
{
//CleanApertureBox = new CleanApertureBox(); // We won't be putting a CleanApertureBox for now
PrivDataFullBox = new AnyPrivFullBox(BoxTypes.Esds, trackInfo.CodecPrivateData); // 3gp mp4v --> esds
this.Size += PrivDataFullBox.Size;
}
if (trackInfo.AspectRatioX != trackInfo.AspectRatioY)
{
PixelAspectRatioBox = new PixelAspectRatioBox();
PixelAspectRatioBox.hSpacing = (uint)trackInfo.AspectRatioX;
PixelAspectRatioBox.vSpacing = (uint)trackInfo.AspectRatioY;
this.Size += PixelAspectRatioBox.Size;
}
}