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bitexact hack for the simple mmx idct

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Originally committed as revision 886 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2002-08-31 14:17:51 +00:00
parent 8e779b900f
commit e7fce5e9fb
1 changed files with 26 additions and 0 deletions
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26
libavcodec/i386/dsputil_mmx.c
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@ -524,6 +524,28 @@ void dsputil_init_mmx(void)
#endif #endif
} }
void gen_idct_put(UINT8 *dest, int line_size, DCTELEM *block);
/**
* this will send coeff matrixes which would have different results for the 16383 type MMX vs C IDCTs to the C IDCT
*/
void bit_exact_idct_put(UINT8 *dest, int line_size, INT16 *block){
if( block[0]>1022 && block[1]==0 && block[4 ]==0 && block[5 ]==0
&& block[8]==0 && block[9]==0 && block[12]==0 && block[13]==0){
int16_t tmp[64];
int i;
for(i=0; i<64; i++)
tmp[i]= block[i];
for(i=0; i<64; i++)
block[i]= tmp[block_permute_op(i)];
simple_idct_put(dest, line_size, block);
}
else
gen_idct_put(dest, line_size, block);
}
/* remove any non bit exact operation (testing purpose). NOTE that /* remove any non bit exact operation (testing purpose). NOTE that
this function should be kept as small as possible because it is this function should be kept as small as possible because it is
always difficult to test automatically non bit exact cases. */ always difficult to test automatically non bit exact cases. */
@ -546,5 +568,9 @@ void dsputil_set_bit_exact_mmx(void)
put_no_rnd_pixels_tab[2] = put_no_rnd_pixels_y2_mmx; put_no_rnd_pixels_tab[2] = put_no_rnd_pixels_y2_mmx;
avg_pixels_tab[3] = avg_pixels_xy2_mmx; avg_pixels_tab[3] = avg_pixels_xy2_mmx;
} }
#ifdef SIMPLE_IDCT
if(ff_idct_put==gen_idct_put && ff_idct == simple_idct_mmx)
ff_idct_put= bit_exact_idct_put;
#endif
} }
} }