wParam = 0;
lParam = 0;
Notifies a video decompression driver to end decompressing and free resources allocated for decompression.
The driver frees any resources allocated for ICM_DECOMPRESSEX_BEGIN.
ICM_DECOMPRESSEX_BEGIN and ICM_DECOMPRESSEX_END do not nest. If your driver receives ICM_DECOMPRESSEX_BEGIN before decompression is stopped with ICM_DECOMPRESSEX_END, it should restart decompression with new parameters.
ICM_DECOMPRESSEX, ICM_DECOMPRESSEX_BEGIN