context   _Inout_
Type: SHAPE_XMA_CONTEXT*Pointer to a SHAPE_XMA_CONTEXT object.offsetInBits  Â
Type: UINT32The offset, in bits, from the beginning of the input buffer.
For the hardware XMA decoder, the read offset for XMA contexts should normally be initialized to 32, or 32 plus some multiple of 2048 bytes.
To get the current input buffer, use GetShapeXmaCurrentInputBuffer.To get the read offset of the current input buffer, use GetShapeXmaInputBufferReadOffset.For more information, see the XMA section of Overview of SHAPE.