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new IDCT code by Michael Niedermayer (michaelni@gmx.at) - #define SIMPLE_IDCT to enable

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Originally committed as revision 234 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Arpi
2001-12-09 12:04:09 +00:00
parent e3d2500fe4
commit d962f6fd3a
5 changed files with 67 additions and 7 deletions
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23
libavcodec/dsputil.h
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@@ -67,10 +67,33 @@ int pix_abs16x16_x2_c(UINT8 *blk1, UINT8 *blk2, int lx, int h);
int pix_abs16x16_y2_c(UINT8 *blk1, UINT8 *blk2, int lx, int h);
int pix_abs16x16_xy2_c(UINT8 *blk1, UINT8 *blk2, int lx, int h);
#if defined (SIMPLE_IDCT) && defined (HAVE_MMX)
static inline int block_permute_op(int j)
{
static const int table[64]={
0x00, 0x08, 0x01, 0x09, 0x04, 0x0C, 0x05, 0x0D,
0x10, 0x18, 0x11, 0x19, 0x14, 0x1C, 0x15, 0x1D,
0x02, 0x0A, 0x03, 0x0B, 0x06, 0x0E, 0x07, 0x0F,
0x12, 0x1A, 0x13, 0x1B, 0x16, 0x1E, 0x17, 0x1F,
0x20, 0x28, 0x21, 0x29, 0x24, 0x2C, 0x25, 0x2D,
0x30, 0x38, 0x31, 0x39, 0x34, 0x3C, 0x35, 0x3D,
0x22, 0x2A, 0x23, 0x2B, 0x26, 0x2E, 0x27, 0x2F,
0x32, 0x3A, 0x33, 0x3B, 0x36, 0x3E, 0x37, 0x3F,
};
return table[j];
}
#elif defined (SIMPLE_IDCT)
static inline int block_permute_op(int j)
{
return j;
}
#else
static inline int block_permute_op(int j)
{
return (j & 0x38) | ((j & 6) >> 1) | ((j & 1) << 2);
}
#endif
void block_permute(INT16 *block);