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Code Issues Releases Activity

added mmx idct

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Originally committed as revision 53 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Fabrice Bellard 2001-08-07 22:49:50 +00:00
parent 3c054a1cdd
commit 8def029919
1 changed files with 9 additions and 26 deletions
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35
libavcodec/i386/dsputil_mmx.c
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@ -29,15 +29,9 @@ int pix_abs16x16_x2_mmx(UINT8 *blk1, UINT8 *blk2, int lx, int h);
int pix_abs16x16_y2_mmx(UINT8 *blk1, UINT8 *blk2, int lx, int h);
int pix_abs16x16_xy2_mmx(UINT8 *blk1, UINT8 *blk2, int lx, int h);
#ifdef USE_MMX_IDCT
/* external functions, defined in libmpeg2 */
void mmx_idct(DCTELEM *block);
void mmxext_idct(DCTELEM *block);
/* this should be in dsputil.h? -- A'rpi */
extern UINT8 ff_alternate_horizontal_scan[64];
extern UINT8 ff_alternate_vertical_scan[64];
extern UINT8 zigzag_direct[64];
#endif
/* external functions, from idct_mmx.c */
void ff_mmx_idct(DCTELEM *block);
void ff_mmxext_idct(DCTELEM *block);
/* pixel operations */
static const unsigned long long int mm_wone __attribute__ ((aligned(8))) = 0x0001000100010001;
@ -1050,22 +1044,11 @@ void dsputil_init_mmx(void)
sub_pixels_tab[2] = sub_pixels_y2_3dnow;
}
#ifdef USE_MMX_IDCT
/* use MMX / MMXEXT iDCT code from libmpeg2 */
//printf("LIBAVCODEC: Using MMX%s iDCT code\n",(mm_flags & MM_MMXEXT)?"EXT":"");
ff_idct = (mm_flags & MM_MMXEXT) ? mmxext_idct : mmx_idct;
/* the mmx/mmxext idct uses a reordered input, so we patch scan tables */
{ int i,j;
for (i = 0; i < 64; i++) {
j = zigzag_direct[i];
zigzag_direct[i] = (j & 0x38) | ((j & 6) >> 1) | ((j & 1) << 2);
j = ff_alternate_horizontal_scan[i];
ff_alternate_horizontal_scan[i] = (j & 0x38) | ((j & 6) >> 1) | ((j & 1) << 2);
j = ff_alternate_vertical_scan[i];
ff_alternate_vertical_scan[i] = (j & 0x38) | ((j & 6) >> 1) | ((j & 1) << 2);
}
}
#endif
/* idct */
if (mm_flags & MM_MMXEXT) {
ff_idct = ff_mmxext_idct;
} else {
ff_idct = ff_mmx_idct;
}
}
}