/// <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);
}