0,0 → 1,169 |
/* |
* 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" |
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/* To allow switching to double. */ |
#define FLOAT float |
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#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) |
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#define A4 0.70710678118654752438 // cos(pi*4/16) |
#define A2 0.92387953251128675613 // cos(pi*2/16) |
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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, |
}; |
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static inline void p8idct(int16_t data[64], FLOAT temp[64], uint8_t *dest, int stride, int x, int y, int type){ |
int i; |
FLOAT av_unused tmp0; |
FLOAT s04, d04, s17, d17, s26, d26, s53, d53; |
FLOAT os07, os16, os25, os34; |
FLOAT od07, od16, od25, od34; |
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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]; |
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od07= s17 + s53; |
od25= (s17 - s53)*(2*A4); |
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#if 0 //these 2 are equivalent |
tmp0= (d17 + d53)*(2*A2); |
od34= d17*( 2*B6) - tmp0; |
od16= d53*(-2*B2) + tmp0; |
#else |
od34= d17*(2*(B6-A2)) - d53*(2*A2); |
od16= d53*(2*(A2-B2)) + d17*(2*A2); |
#endif |
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od16 -= od07; |
od25 -= od16; |
od34 += od25; |
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s26 = temp[2*x + i] + temp[6*x + i]; |
d26 = temp[2*x + i] - temp[6*x + i]; |
d26*= 2*A4; |
d26-= s26; |
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s04= temp[0*x + i] + temp[4*x + i]; |
d04= temp[0*x + i] - temp[4*x + i]; |
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os07= s04 + s26; |
os34= s04 - s26; |
os16= d04 + d26; |
os25= d04 - d26; |
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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)); |
} |
} |
} |
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void ff_faanidct(int16_t block[64]){ |
FLOAT temp[64]; |
int i; |
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emms_c(); |
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for(i=0; i<64; i++) |
temp[i] = block[i] * prescale[i]; |
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p8idct(block, temp, NULL, 0, 1, 8, 0); |
p8idct(block, temp, NULL, 0, 8, 1, 1); |
} |
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void ff_faanidct_add(uint8_t *dest, int line_size, int16_t block[64]){ |
FLOAT temp[64]; |
int i; |
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emms_c(); |
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for(i=0; i<64; i++) |
temp[i] = block[i] * prescale[i]; |
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p8idct(block, temp, NULL, 0, 1, 8, 0); |
p8idct(NULL , temp, dest, line_size, 8, 1, 2); |
} |
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void ff_faanidct_put(uint8_t *dest, int line_size, int16_t block[64]){ |
FLOAT temp[64]; |
int i; |
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emms_c(); |
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for(i=0; i<64; i++) |
temp[i] = block[i] * prescale[i]; |
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p8idct(block, temp, NULL, 0, 1, 8, 0); |
p8idct(NULL , temp, dest, line_size, 8, 1, 3); |
} |