diff options
Diffstat (limited to 'src/libffmpeg/libavcodec/simple_idct.c')
| -rw-r--r-- | src/libffmpeg/libavcodec/simple_idct.c | 87 |
1 files changed, 83 insertions, 4 deletions
diff --git a/src/libffmpeg/libavcodec/simple_idct.c b/src/libffmpeg/libavcodec/simple_idct.c index 9edb7262a..ccebd67a9 100644 --- a/src/libffmpeg/libavcodec/simple_idct.c +++ b/src/libffmpeg/libavcodec/simple_idct.c @@ -25,6 +25,8 @@ #include "dsputil.h" #include "simple_idct.h" +//#define ARCH_ALPHA + #if 0 #define W1 2841 /* 2048*sqrt (2)*cos (1*pi/16) */ #define W2 2676 /* 2048*sqrt (2)*cos (2*pi/16) */ @@ -83,10 +85,13 @@ static inline int idctRowCondDC(int16_t *row) return 0; if ((lrow[0] & ~0xffffULL) == 0) { uint64_t v; - +#if 1 //is ok if |a0| < 1024 than theres an +-1 error (for the *W4 case for W4=16383 !!!) + a0 = row[0]<<3; +#else a0 = W4 * row[0]; a0 += 1 << (ROW_SHIFT - 1); a0 >>= ROW_SHIFT; +#endif v = (uint16_t) a0; v += v << 16; v += v << 32; @@ -168,7 +173,7 @@ static inline int idctRowCondDC(int16_t *row) return 2; } -inline static void idctSparseCol(int16_t *col) +inline static void idctSparseCol2(int16_t *col) { int a0, a1, a2, a3, b0, b1, b2, b3; @@ -478,6 +483,70 @@ static inline void idctSparseColAdd (UINT8 *dest, int line_size, dest[0] = cm[dest[0] + ((a0 - b0) >> COL_SHIFT)]; } +static inline void idctSparseCol (int16_t * col) +{ + int a0, a1, a2, a3, b0, b1, b2, b3; + + /* XXX: I did that only to give same values as previous code */ + a0 = W4 * (col[8*0] + ((1<<(COL_SHIFT-1))/W4)); + a1 = a0; + a2 = a0; + a3 = a0; + + a0 += + W2*col[8*2]; + a1 += + W6*col[8*2]; + a2 += - W6*col[8*2]; + a3 += - W2*col[8*2]; + + MUL16(b0, W1, col[8*1]); + MUL16(b1, W3, col[8*1]); + MUL16(b2, W5, col[8*1]); + MUL16(b3, W7, col[8*1]); + + MAC16(b0, + W3, col[8*3]); + MAC16(b1, - W7, col[8*3]); + MAC16(b2, - W1, col[8*3]); + MAC16(b3, - W5, col[8*3]); + + if(col[8*4]){ + a0 += + W4*col[8*4]; + a1 += - W4*col[8*4]; + a2 += - W4*col[8*4]; + a3 += + W4*col[8*4]; + } + + if (col[8*5]) { + MAC16(b0, + W5, col[8*5]); + MAC16(b1, - W1, col[8*5]); + MAC16(b2, + W7, col[8*5]); + MAC16(b3, + W3, col[8*5]); + } + + if(col[8*6]){ + a0 += + W6*col[8*6]; + a1 += - W2*col[8*6]; + a2 += + W2*col[8*6]; + a3 += - W6*col[8*6]; + } + + if (col[8*7]) { + MAC16(b0, + W7, col[8*7]); + MAC16(b1, - W5, col[8*7]); + MAC16(b2, + W3, col[8*7]); + MAC16(b3, - W1, col[8*7]); + } + + col[0 ] = ((a0 + b0) >> COL_SHIFT); + col[8 ] = ((a1 + b1) >> COL_SHIFT); + col[16] = ((a2 + b2) >> COL_SHIFT); + col[24] = ((a3 + b3) >> COL_SHIFT); + col[32] = ((a3 - b3) >> COL_SHIFT); + col[40] = ((a2 - b2) >> COL_SHIFT); + col[48] = ((a1 - b1) >> COL_SHIFT); + col[56] = ((a0 - b0) >> COL_SHIFT); +} + + #ifdef ARCH_ALPHA /* If all rows but the first one are zero after row transformation, all rows will be identical after column transformation. */ @@ -527,7 +596,7 @@ void simple_idct (short *block) } else if (rowsConstant) { uint64_t *lblock = (uint64_t *) block; - idctSparseCol(block); + idctSparseCol2(block); for (i = 0; i < 8; i++) { uint64_t v = (uint16_t) block[i * 8]; @@ -539,7 +608,7 @@ void simple_idct (short *block) } } else { for (i = 0; i < 8; i++) - idctSparseCol(block + i); + idctSparseCol2(block + i); } } @@ -578,6 +647,16 @@ void simple_idct_add(UINT8 *dest, int line_size, INT16 *block) idctSparseColAdd(dest + i, line_size, block + i); } +void simple_idct(INT16 *block) +{ + int i; + for(i=0; i<8; i++) + idctRowCondDC(block + i*8); + + for(i=0; i<8; i++) + idctSparseCol(block + i); +} + #endif #undef COL_SHIFT |