diff options
Diffstat (limited to 'media/ffvpx/libavcodec/faanidct.c')
| -rw-r--r-- | media/ffvpx/libavcodec/faanidct.c | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/media/ffvpx/libavcodec/faanidct.c b/media/ffvpx/libavcodec/faanidct.c new file mode 100644 index 0000000000..3921f82dae --- /dev/null +++ b/media/ffvpx/libavcodec/faanidct.c @@ -0,0 +1,166 @@ +/* + * Floating point AAN IDCT + * Copyright (c) 2008 Michael Niedermayer <michaelni@gmx.at> + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ +#include "faanidct.h" +#include "libavutil/common.h" + +/* To allow switching to double. */ +typedef float FLOAT; + +#define B0 1.0000000000000000000000 +#define B1 1.3870398453221474618216 // cos(pi*1/16)sqrt(2) +#define B2 1.3065629648763765278566 // cos(pi*2/16)sqrt(2) +#define B3 1.1758756024193587169745 // cos(pi*3/16)sqrt(2) +#define B4 1.0000000000000000000000 // cos(pi*4/16)sqrt(2) +#define B5 0.7856949583871021812779 // cos(pi*5/16)sqrt(2) +#define B6 0.5411961001461969843997 // cos(pi*6/16)sqrt(2) +#define B7 0.2758993792829430123360 // cos(pi*7/16)sqrt(2) + +#define A4 0.70710678118654752438 // cos(pi*4/16) +#define A2 0.92387953251128675613 // cos(pi*2/16) + +static const FLOAT prescale[64]={ +B0*B0/8, B0*B1/8, B0*B2/8, B0*B3/8, B0*B4/8, B0*B5/8, B0*B6/8, B0*B7/8, +B1*B0/8, B1*B1/8, B1*B2/8, B1*B3/8, B1*B4/8, B1*B5/8, B1*B6/8, B1*B7/8, +B2*B0/8, B2*B1/8, B2*B2/8, B2*B3/8, B2*B4/8, B2*B5/8, B2*B6/8, B2*B7/8, +B3*B0/8, B3*B1/8, B3*B2/8, B3*B3/8, B3*B4/8, B3*B5/8, B3*B6/8, B3*B7/8, +B4*B0/8, B4*B1/8, B4*B2/8, B4*B3/8, B4*B4/8, B4*B5/8, B4*B6/8, B4*B7/8, +B5*B0/8, B5*B1/8, B5*B2/8, B5*B3/8, B5*B4/8, B5*B5/8, B5*B6/8, B5*B7/8, +B6*B0/8, B6*B1/8, B6*B2/8, B6*B3/8, B6*B4/8, B6*B5/8, B6*B6/8, B6*B7/8, +B7*B0/8, B7*B1/8, B7*B2/8, B7*B3/8, B7*B4/8, B7*B5/8, B7*B6/8, B7*B7/8, +}; + +static inline void p8idct(int16_t data[64], FLOAT temp[64], uint8_t *dest, + ptrdiff_t stride, int x, int y, int type) +{ + int i; + FLOAT s04, d04, s17, d17, s26, d26, s53, d53; + FLOAT os07, os16, os25, os34; + FLOAT od07, od16, od25, od34; + + for(i=0; i<y*8; i+=y){ + s17= temp[1*x + i] + temp[7*x + i]; + d17= temp[1*x + i] - temp[7*x + i]; + s53= temp[5*x + i] + temp[3*x + i]; + d53= temp[5*x + i] - temp[3*x + i]; + + od07= s17 + s53; + od25= (s17 - s53)*(2*A4); + + od34= d17*(2*(B6-A2)) - d53*(2*A2); + od16= d53*(2*(A2-B2)) + d17*(2*A2); + + od16 -= od07; + od25 -= od16; + od34 += od25; + + s26 = temp[2*x + i] + temp[6*x + i]; + d26 = temp[2*x + i] - temp[6*x + i]; + d26*= 2*A4; + d26-= s26; + + s04= temp[0*x + i] + temp[4*x + i]; + d04= temp[0*x + i] - temp[4*x + i]; + + os07= s04 + s26; + os34= s04 - s26; + os16= d04 + d26; + os25= d04 - d26; + + if(type==0){ + temp[0*x + i]= os07 + od07; + temp[7*x + i]= os07 - od07; + temp[1*x + i]= os16 + od16; + temp[6*x + i]= os16 - od16; + temp[2*x + i]= os25 + od25; + temp[5*x + i]= os25 - od25; + temp[3*x + i]= os34 - od34; + temp[4*x + i]= os34 + od34; + }else if(type==1){ + data[0*x + i]= lrintf(os07 + od07); + data[7*x + i]= lrintf(os07 - od07); + data[1*x + i]= lrintf(os16 + od16); + data[6*x + i]= lrintf(os16 - od16); + data[2*x + i]= lrintf(os25 + od25); + data[5*x + i]= lrintf(os25 - od25); + data[3*x + i]= lrintf(os34 - od34); + data[4*x + i]= lrintf(os34 + od34); + }else if(type==2){ + dest[0*stride + i]= av_clip_uint8(((int)dest[0*stride + i]) + lrintf(os07 + od07)); + dest[7*stride + i]= av_clip_uint8(((int)dest[7*stride + i]) + lrintf(os07 - od07)); + dest[1*stride + i]= av_clip_uint8(((int)dest[1*stride + i]) + lrintf(os16 + od16)); + dest[6*stride + i]= av_clip_uint8(((int)dest[6*stride + i]) + lrintf(os16 - od16)); + dest[2*stride + i]= av_clip_uint8(((int)dest[2*stride + i]) + lrintf(os25 + od25)); + dest[5*stride + i]= av_clip_uint8(((int)dest[5*stride + i]) + lrintf(os25 - od25)); + dest[3*stride + i]= av_clip_uint8(((int)dest[3*stride + i]) + lrintf(os34 - od34)); + dest[4*stride + i]= av_clip_uint8(((int)dest[4*stride + i]) + lrintf(os34 + od34)); + }else{ + dest[0*stride + i]= av_clip_uint8(lrintf(os07 + od07)); + dest[7*stride + i]= av_clip_uint8(lrintf(os07 - od07)); + dest[1*stride + i]= av_clip_uint8(lrintf(os16 + od16)); + dest[6*stride + i]= av_clip_uint8(lrintf(os16 - od16)); + dest[2*stride + i]= av_clip_uint8(lrintf(os25 + od25)); + dest[5*stride + i]= av_clip_uint8(lrintf(os25 - od25)); + dest[3*stride + i]= av_clip_uint8(lrintf(os34 - od34)); + dest[4*stride + i]= av_clip_uint8(lrintf(os34 + od34)); + } + } +} + +void ff_faanidct(int16_t block[64]){ + FLOAT temp[64]; + int i; + + emms_c(); + + for(i=0; i<64; i++) + temp[i] = block[i] * prescale[i]; + + p8idct(block, temp, NULL, 0, 1, 8, 0); + p8idct(block, temp, NULL, 0, 8, 1, 1); +} + +void ff_faanidct_add(uint8_t *dest, ptrdiff_t line_size, int16_t block[64]) +{ + FLOAT temp[64]; + int i; + + emms_c(); + + for(i=0; i<64; i++) + temp[i] = block[i] * prescale[i]; + + p8idct(block, temp, NULL, 0, 1, 8, 0); + p8idct(NULL , temp, dest, line_size, 8, 1, 2); +} + +void ff_faanidct_put(uint8_t *dest, ptrdiff_t line_size, int16_t block[64]) +{ + FLOAT temp[64]; + int i; + + emms_c(); + + for(i=0; i<64; i++) + temp[i] = block[i] * prescale[i]; + + p8idct(block, temp, NULL, 0, 1, 8, 0); + p8idct(NULL , temp, dest, line_size, 8, 1, 3); +} |