idct_mmx.c

MPEG2的编码的加密和解码的C源程序

    static const short _T3[] ATTR_ALIGN(8) = {T3,T3,T3,T3};
    static const short _C4[] ATTR_ALIGN(8) = {C4,C4,C4,C4};

    /* column code adapted from peter gubanov */
    /* http://www.elecard.com/peter/idct.shtml */

    movq_m2r (*_T1, mm0);		/* mm0 = T1 */

    movq_m2r (*(col+offset+1*8), mm1);	/* mm1 = x1 */
    movq_r2r (mm0, mm2);		/* mm2 = T1 */

    movq_m2r (*(col+offset+7*8), mm4);	/* mm4 = x7 */
    pmulhw_r2r (mm1, mm0);		/* mm0 = T1*x1 */

    movq_m2r (*_T3, mm5);		/* mm5 = T3 */
    pmulhw_r2r (mm4, mm2);		/* mm2 = T1*x7 */

    movq_m2r (*(col+offset+5*8), mm6);	/* mm6 = x5 */
    movq_r2r (mm5, mm7);		/* mm7 = T3-1 */

    movq_m2r (*(col+offset+3*8), mm3);	/* mm3 = x3 */
    psubsw_r2r (mm4, mm0);		/* mm0 = v17 */

    movq_m2r (*_T2, mm4);		/* mm4 = T2 */
    pmulhw_r2r (mm3, mm5);		/* mm5 = (T3-1)*x3 */

    paddsw_r2r (mm2, mm1);		/* mm1 = u17 */
    pmulhw_r2r (mm6, mm7);		/* mm7 = (T3-1)*x5 */

    /* slot */

    movq_r2r (mm4, mm2);		/* mm2 = T2 */
    paddsw_r2r (mm3, mm5);		/* mm5 = T3*x3 */

    pmulhw_m2r (*(col+offset+2*8), mm4);/* mm4 = T2*x2 */
    paddsw_r2r (mm6, mm7);		/* mm7 = T3*x5 */

    psubsw_r2r (mm6, mm5);		/* mm5 = v35 */
    paddsw_r2r (mm3, mm7);		/* mm7 = u35 */

    movq_m2r (*(col+offset+6*8), mm3);	/* mm3 = x6 */
    movq_r2r (mm0, mm6);		/* mm6 = v17 */

    pmulhw_r2r (mm3, mm2);		/* mm2 = T2*x6 */
    psubsw_r2r (mm5, mm0);		/* mm0 = b3 */

    psubsw_r2r (mm3, mm4);		/* mm4 = v26 */
    paddsw_r2r (mm6, mm5);		/* mm5 = v12 */

    movq_r2m (mm0, *(col+offset+3*8));	/* save b3 in scratch0 */
    movq_r2r (mm1, mm6);		/* mm6 = u17 */

    paddsw_m2r (*(col+offset+2*8), mm2);/* mm2 = u26 */
    paddsw_r2r (mm7, mm6);		/* mm6 = b0 */

    psubsw_r2r (mm7, mm1);		/* mm1 = u12 */
    movq_r2r (mm1, mm7);		/* mm7 = u12 */

    movq_m2r (*(col+offset+0*8), mm3);	/* mm3 = x0 */
    paddsw_r2r (mm5, mm1);		/* mm1 = u12+v12 */

    movq_m2r (*_C4, mm0);		/* mm0 = C4/2 */
    psubsw_r2r (mm5, mm7);		/* mm7 = u12-v12 */

    movq_r2m (mm6, *(col+offset+5*8));	/* save b0 in scratch1 */
    pmulhw_r2r (mm0, mm1);		/* mm1 = b1/2 */

    movq_r2r (mm4, mm6);		/* mm6 = v26 */
    pmulhw_r2r (mm0, mm7);		/* mm7 = b2/2 */

    movq_m2r (*(col+offset+4*8), mm5);	/* mm5 = x4 */
    movq_r2r (mm3, mm0);		/* mm0 = x0 */

    psubsw_r2r (mm5, mm3);		/* mm3 = v04 */
    paddsw_r2r (mm5, mm0);		/* mm0 = u04 */

    paddsw_r2r (mm3, mm4);		/* mm4 = a1 */
    movq_r2r (mm0, mm5);		/* mm5 = u04 */

    psubsw_r2r (mm6, mm3);		/* mm3 = a2 */
    paddsw_r2r (mm2, mm5);		/* mm5 = a0 */

    paddsw_r2r (mm1, mm1);		/* mm1 = b1 */
    psubsw_r2r (mm2, mm0);		/* mm0 = a3 */

    paddsw_r2r (mm7, mm7);		/* mm7 = b2 */
    movq_r2r (mm3, mm2);		/* mm2 = a2 */

    movq_r2r (mm4, mm6);		/* mm6 = a1 */
    paddsw_r2r (mm7, mm3);		/* mm3 = a2+b2 */

    psraw_i2r (COL_SHIFT, mm3);		/* mm3 = y2 */
    paddsw_r2r (mm1, mm4);		/* mm4 = a1+b1 */

    psraw_i2r (COL_SHIFT, mm4);		/* mm4 = y1 */
    psubsw_r2r (mm1, mm6);		/* mm6 = a1-b1 */

    movq_m2r (*(col+offset+5*8), mm1);	/* mm1 = b0 */
    psubsw_r2r (mm7, mm2);		/* mm2 = a2-b2 */

    psraw_i2r (COL_SHIFT, mm6);		/* mm6 = y6 */
    movq_r2r (mm5, mm7);		/* mm7 = a0 */

    movq_r2m (mm4, *(col+offset+1*8));	/* save y1 */
    psraw_i2r (COL_SHIFT, mm2);		/* mm2 = y5 */

    movq_r2m (mm3, *(col+offset+2*8));	/* save y2 */
    paddsw_r2r (mm1, mm5);		/* mm5 = a0+b0 */

    movq_m2r (*(col+offset+3*8), mm4);	/* mm4 = b3 */
    psubsw_r2r (mm1, mm7);		/* mm7 = a0-b0 */

    psraw_i2r (COL_SHIFT, mm5);		/* mm5 = y0 */
    movq_r2r (mm0, mm3);		/* mm3 = a3 */

    movq_r2m (mm2, *(col+offset+5*8));	/* save y5 */
    psubsw_r2r (mm4, mm3);		/* mm3 = a3-b3 */

    psraw_i2r (COL_SHIFT, mm7);		/* mm7 = y7 */
    paddsw_r2r (mm0, mm4);		/* mm4 = a3+b3 */

    movq_r2m (mm5, *(col+offset+0*8));	/* save y0 */
    psraw_i2r (COL_SHIFT, mm3);		/* mm3 = y4 */

    movq_r2m (mm6, *(col+offset+6*8));	/* save y6 */
    psraw_i2r (COL_SHIFT, mm4);		/* mm4 = y3 */

    movq_r2m (mm7, *(col+offset+7*8));	/* save y7 */

    movq_r2m (mm3, *(col+offset+4*8));	/* save y4 */

    movq_r2m (mm4, *(col+offset+3*8));	/* save y3 */
}


static const int32_t rounder0[] ATTR_ALIGN(8) =
    rounder ((1 << (COL_SHIFT - 1)) - 0.5);
static const int32_t rounder4[] ATTR_ALIGN(8) = rounder (0);
static const int32_t rounder1[] ATTR_ALIGN(8) =
    rounder (1.25683487303);	/* C1*(C1/C4+C1+C7)/2 */
static const int32_t rounder7[] ATTR_ALIGN(8) =
    rounder (-0.25);		/* C1*(C7/C4+C7-C1)/2 */
static const int32_t rounder2[] ATTR_ALIGN(8) =
    rounder (0.60355339059);	/* C2 * (C6+C2)/2 */
static const int32_t rounder6[] ATTR_ALIGN(8) =
    rounder (-0.25);		/* C2 * (C6-C2)/2 */
static const int32_t rounder3[] ATTR_ALIGN(8) =
    rounder (0.087788325588);	/* C3*(-C3/C4+C3+C5)/2 */
static const int32_t rounder5[] ATTR_ALIGN(8) =
    rounder (-0.441341716183);	/* C3*(-C5/C4+C5-C3)/2 */


#define declare_idct(idct,table,idct_row_head,idct_row,idct_row_tail,idct_row_mid)	\
static inline void idct (int16_t * const block)				\
{									\
    static const int16_t table04[] ATTR_ALIGN(16) =			\
	table (22725, 21407, 19266, 16384, 12873,  8867, 4520);		\
    static const int16_t table17[] ATTR_ALIGN(16) =			\
	table (31521, 29692, 26722, 22725, 17855, 12299, 6270);		\
    static const int16_t table26[] ATTR_ALIGN(16) =			\
	table (29692, 27969, 25172, 21407, 16819, 11585, 5906);		\
    static const int16_t table35[] ATTR_ALIGN(16) =			\
	table (26722, 25172, 22654, 19266, 15137, 10426, 5315);		\
									\
    idct_row_head (block, 0*8, table04);				\
    idct_row (table04, rounder0);					\
    idct_row_mid (block, 0*8, 4*8, table04);				\
    idct_row (table04, rounder4);					\
    idct_row_mid (block, 4*8, 1*8, table17);				\
    idct_row (table17, rounder1);					\
    idct_row_mid (block, 1*8, 7*8, table17);				\
    idct_row (table17, rounder7);					\
    idct_row_mid (block, 7*8, 2*8, table26);				\
    idct_row (table26, rounder2);					\
    idct_row_mid (block, 2*8, 6*8, table26);				\
    idct_row (table26, rounder6);					\
    idct_row_mid (block, 6*8, 3*8, table35);				\
    idct_row (table35, rounder3);					\
    idct_row_mid (block, 3*8, 5*8, table35);				\
    idct_row (table35, rounder5);					\
    idct_row_tail (block, 5*8);						\
									\
    idct_col (block, 0);						\
    idct_col (block, 4);						\
}


#define COPY_MMX(offset,r0,r1,r2)	\
do {					\
    movq_m2r (*(block+offset), r0);	\
    dest += stride;			\
    movq_m2r (*(block+offset+4), r1);	\
    movq_r2m (r2, *dest);		\
    packuswb_r2r (r1, r0);		\
} while (0)

static inline void block_copy (int16_t * const block, uint8_t * dest,
			       const int stride)
{
    movq_m2r (*(block+0*8), mm0);
    movq_m2r (*(block+0*8+4), mm1);
    movq_m2r (*(block+1*8), mm2);
    packuswb_r2r (mm1, mm0);
    movq_m2r (*(block+1*8+4), mm3);
    movq_r2m (mm0, *dest);
    packuswb_r2r (mm3, mm2);
    COPY_MMX (2*8, mm0, mm1, mm2);
    COPY_MMX (3*8, mm2, mm3, mm0);
    COPY_MMX (4*8, mm0, mm1, mm2);
    COPY_MMX (5*8, mm2, mm3, mm0);
    COPY_MMX (6*8, mm0, mm1, mm2);
    COPY_MMX (7*8, mm2, mm3, mm0);
    movq_r2m (mm2, *(dest+stride));
}


#define ADD_MMX(offset,r1,r2,r3,r4)	\
do {					\
    movq_m2r (*(dest+2*stride), r1);	\
    packuswb_r2r (r4, r3);		\
    movq_r2r (r1, r2);			\
    dest += stride;			\
    movq_r2m (r3, *dest);		\
    punpcklbw_r2r (mm0, r1);		\
    paddsw_m2r (*(block+offset), r1);	\
    punpckhbw_r2r (mm0, r2);		\
    paddsw_m2r (*(block+offset+4), r2);	\
} while (0)

static inline void block_add (int16_t * const block, uint8_t * dest,
			      const int stride)
{
    movq_m2r (*dest, mm1);
    pxor_r2r (mm0, mm0);
    movq_m2r (*(dest+stride), mm3);
    movq_r2r (mm1, mm2);
    punpcklbw_r2r (mm0, mm1);
    movq_r2r (mm3, mm4);
    paddsw_m2r (*(block+0*8), mm1);
    punpckhbw_r2r (mm0, mm2);
    paddsw_m2r (*(block+0*8+4), mm2);
    punpcklbw_r2r (mm0, mm3);
    paddsw_m2r (*(block+1*8), mm3);
    packuswb_r2r (mm2, mm1);
    punpckhbw_r2r (mm0, mm4);
    movq_r2m (mm1, *dest);
    paddsw_m2r (*(block+1*8+4), mm4);
    ADD_MMX (2*8, mm1, mm2, mm3, mm4);
    ADD_MMX (3*8, mm3, mm4, mm1, mm2);
    ADD_MMX (4*8, mm1, mm2, mm3, mm4);
    ADD_MMX (5*8, mm3, mm4, mm1, mm2);
    ADD_MMX (6*8, mm1, mm2, mm3, mm4);
    ADD_MMX (7*8, mm3, mm4, mm1, mm2);
    packuswb_r2r (mm4, mm3);
    movq_r2m (mm3, *(dest+stride));
}


static inline void block_zero (int16_t * const block)
{
    pxor_r2r (mm0, mm0);
    movq_r2m (mm0, *(block+0*4));
    movq_r2m (mm0, *(block+1*4));
    movq_r2m (mm0, *(block+2*4));
    movq_r2m (mm0, *(block+3*4));
    movq_r2m (mm0, *(block+4*4));
    movq_r2m (mm0, *(block+5*4));
    movq_r2m (mm0, *(block+6*4));
    movq_r2m (mm0, *(block+7*4));
    movq_r2m (mm0, *(block+8*4));
    movq_r2m (mm0, *(block+9*4));
    movq_r2m (mm0, *(block+10*4));
    movq_r2m (mm0, *(block+11*4));
    movq_r2m (mm0, *(block+12*4));
    movq_r2m (mm0, *(block+13*4));
    movq_r2m (mm0, *(block+14*4));
    movq_r2m (mm0, *(block+15*4));
}


#define CPU_MMXEXT 0
#define CPU_MMX 1

#define dup4(reg)			\
do {					\
    if (cpu != CPU_MMXEXT) {		\
	punpcklwd_r2r (reg, reg);	\
	punpckldq_r2r (reg, reg);	\
    } else				\
	pshufw_r2r (reg, reg, 0x00);	\
} while (0)

static inline void block_add_DC (int16_t * const block, uint8_t * dest,
				 const int stride, const int cpu)
{
    movd_v2r ((block[0] + 64) >> 7, mm0);
    pxor_r2r (mm1, mm1);
    movq_m2r (*dest, mm2);
    dup4 (mm0);
    psubsw_r2r (mm0, mm1);
    packuswb_r2r (mm0, mm0);
    paddusb_r2r (mm0, mm2);
    packuswb_r2r (mm1, mm1);
    movq_m2r (*(dest + stride), mm3);
    psubusb_r2r (mm1, mm2);
    block[0] = 0;
    paddusb_r2r (mm0, mm3);
    movq_r2m (mm2, *dest);
    psubusb_r2r (mm1, mm3);
    movq_m2r (*(dest + 2*stride), mm2);
    dest += stride;
    movq_r2m (mm3, *dest);
    paddusb_r2r (mm0, mm2);
    movq_m2r (*(dest + 2*stride), mm3);
    psubusb_r2r (mm1, mm2);
    dest += stride;
    paddusb_r2r (mm0, mm3);
    movq_r2m (mm2, *dest);
    psubusb_r2r (mm1, mm3);
    movq_m2r (*(dest + 2*stride), mm2);
    dest += stride;
    movq_r2m (mm3, *dest);
    paddusb_r2r (mm0, mm2);
    movq_m2r (*(dest + 2*stride), mm3);
    psubusb_r2r (mm1, mm2);
    dest += stride;
    paddusb_r2r (mm0, mm3);
    movq_r2m (mm2, *dest);
    psubusb_r2r (mm1, mm3);
    movq_m2r (*(dest + 2*stride), mm2);
    dest += stride;
    movq_r2m (mm3, *dest);
    paddusb_r2r (mm0, mm2);
    movq_m2r (*(dest + 2*stride), mm3);
    psubusb_r2r (mm1, mm2);
    block[63] = 0;
    paddusb_r2r (mm0, mm3);
    movq_r2m (mm2, *(dest + stride));
    psubusb_r2r (mm1, mm3);
    movq_r2m (mm3, *(dest + 2*stride));
}


declare_idct (mmxext_idct, mmxext_table,
	      mmxext_row_head, mmxext_row, mmxext_row_tail, mmxext_row_mid)

void mpeg2_idct_copy_mmxext (int16_t * const block, uint8_t * const dest,
			     const int stride)
{
    mmxext_idct (block);
    block_copy (block, dest, stride);
    block_zero (block);
}

void mpeg2_idct_add_mmxext (const int last, int16_t * const block,
			    uint8_t * const dest, const int stride)
{
    if (last != 129 || (block[0] & (7 << 4)) == (4 << 4)) {
	mmxext_idct (block);
	block_add (block, dest, stride);
	block_zero (block);
    } else
	block_add_DC (block, dest, stride, CPU_MMXEXT);
}


declare_idct (mmx_idct, mmx_table,
	      mmx_row_head, mmx_row, mmx_row_tail, mmx_row_mid)

void mpeg2_idct_copy_mmx (int16_t * const block, uint8_t * const dest,
			  const int stride)
{
    mmx_idct (block);
    block_copy (block, dest, stride);
    block_zero (block);
}

void mpeg2_idct_add_mmx (const int last, int16_t * const block,
			 uint8_t * const dest, const int stride)
{
    if (last != 129 || (block[0] & (7 << 4)) == (4 << 4)) {
	mmx_idct (block);
	block_add (block, dest, stride);
	block_zero (block);
    } else
	block_add_DC (block, dest, stride, CPU_MMX);
}


void mpeg2_idct_mmx_init (void)
{
    extern uint8_t mpeg2_scan_norm[64];
    extern uint8_t mpeg2_scan_alt[64];
    int i, j;

    /* the mmx/mmxext idct uses a reordered input, so we patch scan tables */

    for (i = 0; i < 64; i++) {
	j = mpeg2_scan_norm[i];
	mpeg2_scan_norm[i] = (j & 0x38) | ((j & 6) >> 1) | ((j & 1) << 2);
	j = mpeg2_scan_alt[i];
	mpeg2_scan_alt[i] = (j & 0x38) | ((j & 6) >> 1) | ((j & 1) << 2);
    }
}

#endif