idct
idct(decdata->dcts, decdata->out, decdata->dquant[0],
idct(decdata->dcts + 64, decdata->out + 64,
idct(decdata->dcts + 128, decdata->out + 128,
idct(decdata->dcts + 192, decdata->out + 192,
idct(decdata->dcts + 128, decdata->out + 256,
idct(decdata->dcts + 192, decdata->out + 320,
static void idct __P((int *, int *, PREC *, PREC, int));