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| author | Michael Niedermayer <michaelni@gmx.at> | 2002-12-27 23:51:46 +0000 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2002-12-27 23:51:46 +0000 |
| commit | 1457ab523343e94e094ad1c60de37077f8dc5589 (patch) | |
| tree | 2df86f0b66c5df4c373dec5809a1f62c563df901 /libavcodec/simple_idct.c | |
| parent | ac97734133a52c41825e427fd15a66f65a89d4bb (diff) | |
| download | ffmpeg-1457ab523343e94e094ad1c60de37077f8dc5589.tar.gz | |
qpel encoding
4mv+b frames encoding finally fixed
chroma ME
5 comparission functions for ME
b frame encoding speedup
wmv2 codec (unfinished)
user specified diamond size for EPZS
Originally committed as revision 1365 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/simple_idct.c')
| -rw-r--r-- | libavcodec/simple_idct.c | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/libavcodec/simple_idct.c b/libavcodec/simple_idct.c index ad27ac5942..8c9ce7b936 100644 --- a/libavcodec/simple_idct.c +++ b/libavcodec/simple_idct.c @@ -473,3 +473,93 @@ void simple_idct248_put(UINT8 *dest, int line_size, INT16 *block) idct4col(dest + line_size + i, 2 * line_size, block + 8 + i); } } + +/* 8x4 & 4x8 WMV2 IDCT */ +#undef CN_SHIFT +#undef C_SHIFT +#undef C_FIX +#undef C1 +#undef C2 +#define CN_SHIFT 12 +#define C_FIX(x) ((int)((x) * 1.414213562 * (1 << CN_SHIFT) + 0.5)) +#define C1 C_FIX(0.6532814824) +#define C2 C_FIX(0.2705980501) +#define C3 C_FIX(0.5) +#define C_SHIFT (4+1+12) +static inline void idct4col_add(UINT8 *dest, int line_size, const INT16 *col) +{ + int c0, c1, c2, c3, a0, a1, a2, a3; + const UINT8 *cm = cropTbl + MAX_NEG_CROP; + + a0 = col[8*0]; + a1 = col[8*1]; + a2 = col[8*2]; + a3 = col[8*3]; + c0 = (a0 + a2)*C3 + (1 << (C_SHIFT - 1)); + c2 = (a0 - a2)*C3 + (1 << (C_SHIFT - 1)); + c1 = a1 * C1 + a3 * C2; + c3 = a1 * C2 - a3 * C1; + dest[0] = cm[dest[0] + ((c0 + c1) >> C_SHIFT)]; + dest += line_size; + dest[0] = cm[dest[0] + ((c2 + c3) >> C_SHIFT)]; + dest += line_size; + dest[0] = cm[dest[0] + ((c2 - c3) >> C_SHIFT)]; + dest += line_size; + dest[0] = cm[dest[0] + ((c0 - c1) >> C_SHIFT)]; +} + +#define RN_SHIFT 15 +#define R_FIX(x) ((int)((x) * 1.414213562 * (1 << RN_SHIFT) + 0.5)) +#define R1 R_FIX(0.6532814824) +#define R2 R_FIX(0.2705980501) +#define R3 R_FIX(0.5) +#define R_SHIFT 11 +static inline void idct4row(INT16 *row) +{ + int c0, c1, c2, c3, a0, a1, a2, a3; + const UINT8 *cm = cropTbl + MAX_NEG_CROP; + + a0 = row[0]; + a1 = row[1]; + a2 = row[2]; + a3 = row[3]; + c0 = (a0 + a2)*R3 + (1 << (R_SHIFT - 1)); + c2 = (a0 - a2)*R3 + (1 << (R_SHIFT - 1)); + c1 = a1 * R1 + a3 * R2; + c3 = a1 * R2 - a3 * R1; + row[0]= (c0 + c1) >> R_SHIFT; + row[1]= (c2 + c3) >> R_SHIFT; + row[2]= (c2 - c3) >> R_SHIFT; + row[3]= (c0 - c1) >> R_SHIFT; +} + +void simple_idct84_add(UINT8 *dest, int line_size, INT16 *block) +{ + int i; + + /* IDCT8 on each line */ + for(i=0; i<4; i++) { + idctRowCondDC(block + i*8); + } + + /* IDCT4 and store */ + for(i=0;i<8;i++) { + idct4col_add(dest + i, line_size, block + i); + } +} + +void simple_idct48_add(UINT8 *dest, int line_size, INT16 *block) +{ + int i; + + /* IDCT4 on each line */ + for(i=0; i<8; i++) { + idct4row(block + i*8); + } + + /* IDCT8 and store */ + for(i=0; i<4; i++){ + idctSparseColAdd(dest + i, line_size, block + i); + } +} + |