public override void decode(MP4InputStream inStream)
{
base.decode(inStream);
graphicsMode = inStream.readBytes(2);
// 6 byte RGB color
var c = new int[3];
for (int i = 0; i < 3; i++)
{
c[i] = (inStream.read() & 0xFF) | ((inStream.read() << 8) & 0xFF);
}
color = Color.FromArgb(c[0], c[1], c[2]);
}
public override void decode(MP4InputStream inStream)
{
base.decode(inStream);
dataType = forInt(flags);
inStream.skipBytes(4); // padding?
data = new byte[(int)getLeft(inStream)];
inStream.read(data, 0, data.Length);
}
public static Descriptor createDescriptor(MP4InputStream inStream)
{
//read tag and size
int type = inStream.read();
int read = 1;
int size = 0;
int b = 0;
do
{
b = inStream.read();
size <<= 7;
size |= b & 0x7f;
read++;
}while ((b & 0x80) == 0x80);
//create descriptor
Descriptor desc = forTag(type);
desc.type = type;
desc.size = size;
desc.start = inStream.getOffset();
//decode
desc.decode(inStream);
//skip remaining bytes
long remaining = size - (inStream.getOffset() - desc.start);
if (remaining > 0)
{
Logger.LogBoxes(string.Format("Descriptor: bytes left: {0:N0}, offset: {1:N0}", remaining, inStream.getOffset()));
inStream.skipBytes(remaining);
}
desc.size += read; //include type and size fields
return(desc);
}
/// <summary>
/// Reads the next frame from this track. If it contains no more frames to read, null is returned.
/// </summary>
/// <returns>the next frame or null if there are no more frames to read</returns>
public Frame readNextFrame()
{
Frame frame = null;
if (hasMoreFrames())
{
frame = frames[currentFrame];
long diff = frame.getOffset() - inStream.getOffset();
if (diff > 0)
{
inStream.skipBytes(diff);
}
else if (diff < 0)
{
if (inStream.hasRandomAccess())
{
inStream.seek(frame.getOffset());
}
else
{
Logger.LogServe(string.Format("MP4 API: readNextFrame failed: frame {0:N0} already skipped, offset:{1:N0}, stream:{2:N0}", currentFrame, frame.getOffset(), inStream.getOffset()));
throw new IOException("frame already skipped and no random access");
}
}
var b = new byte[(int)frame.getSize()];
try
{
inStream.read(b, 0, b.Length);
}
catch (Exception)
{
Logger.LogServe(string.Format("MP4 API: readNextFrame failed: tried to read {0:N0} bytes at {1:N0}", frame.getSize(), inStream.getOffset()));
throw;
}
frame.setData(b);
currentFrame++;
}
return(frame);
}
