MMDECOMPRESS Field - ulFlags

ulFlags (ULONG)

Some flags are set to instruct the I/O or CODEC procedure to act. Others are status, returned from the I/O or CODEC procedure.

MMIO_DROP_DELTA_FRAME

Tells the I/O or CODEC procedure to drop the delta frame if the pSrcBuf field contains a delta frame. On return, the bit is reset if the delta frame is dropped.
MMIO_IS_KEY_FRAME
This bit is set by the I/O or CODEC procedure when the data contained in the pSrcBuf field is a key or reference frame.
MMIO_IS_PALETTE
A video palette is found. Set by the I/O procedure.
MMIO_PALETTE_CHANGE
The physical palette has been changed in the genpalPhysical field of the MMVIDEODECOMPRESS structure. Set by the application.
MMIO_ORIGIN_LOWERLEFT
Tells the I/O or CODEC procedure to decompress data to the destination buffer using the lower left as window origin. This means the decompressed data lines will be stored in reverse order in the destination buffer.
MMIO_ORIGIN_UPPERLEFT
Tells the I/O or CODEC procedure to decompress data to the destination buffer using the upper-left as window origin. This means the decompressed data lines will be stored in the same order as the incoming compressed data lines.
MMIO_RECTL_CHANGE
The movie rectangle has been changed. Valid rectangles are specified in the prectl and ulRectlCount fields of the MMVIDEODECOMPRESS structure.

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