X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavcodec%2Ffaandct.c;h=7888633d7cc5139a37ba575bd20f6158a72f9703;hb=a2ca8ed903b435446031a8a0792ca535e6ee2913;hp=a8ae0310dc1771481c618667892f7dccad2f4a0d;hpb=5b0d04d308318082cfa4ca458583db6b06c036ab;p=ffmpeg diff --git a/libavcodec/faandct.c b/libavcodec/faandct.c index a8ae0310dc1..7888633d7cc 100644 --- a/libavcodec/faandct.c +++ b/libavcodec/faandct.c @@ -1,45 +1,35 @@ /* * Floating point AAN DCT - * Copyright (c) 2003 Michael Niedermayer - * * this implementation is based upon the IJG integer AAN DCT (see jfdctfst.c) * - * 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. + * Copyright (c) 2003 Michael Niedermayer + * Copyright (c) 2003 Roman Shaposhnik * - * 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 + * Permission to use, copy, modify, and/or distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. * - * The AAN DCT in this file except ff_faandct248() can also be used under the - * BSD license. + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ /** - * @file faandct.c + * @file * @brief * Floating point AAN DCT * @author Michael Niedermayer */ -#include "dsputil.h" #include "faandct.h" +#include "libavutil/internal.h" +#include "libavutil/libm.h" #define FLOAT float -#ifdef FAAN_POSTSCALE -# define SCALE(x) postscale[x] -#else -# define SCALE(x) 1 -#endif //numbers generated by simple c code (not as accurate as they could be) /* @@ -62,7 +52,7 @@ for(i=0; i<8; i++){ #define A5 0.38268343236508977170 // cos(pi*6/16) #define A4 1.30656296487637652774 // cos(pi*2/16)sqrt(2) -static FLOAT postscale[64]={ +static const FLOAT postscale[64]={ B0*B0, B0*B1, B0*B2, B0*B3, B0*B4, B0*B5, B0*B6, B0*B7, B1*B0, B1*B1, B1*B2, B1*B3, B1*B4, B1*B5, B1*B6, B1*B7, B2*B0, B2*B1, B2*B2, B2*B3, B2*B4, B2*B5, B2*B6, B2*B7, @@ -73,11 +63,11 @@ B6*B0, B6*B1, B6*B2, B6*B3, B6*B4, B6*B5, B6*B6, B6*B7, B7*B0, B7*B1, B7*B2, B7*B3, B7*B4, B7*B5, B7*B6, B7*B7, }; -static av_always_inline void row_fdct(FLOAT temp[64], DCTELEM * data) +static av_always_inline void row_fdct(FLOAT temp[64], int16_t *data) { FLOAT tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7; FLOAT tmp10, tmp11, tmp12, tmp13; - FLOAT z1, z2, z3, z4, z5, z11, z13; + FLOAT z2, z4, z11, z13; int i; for (i=0; i<8*8; i+=8) { @@ -98,21 +88,22 @@ static av_always_inline void row_fdct(FLOAT temp[64], DCTELEM * data) temp[0 + i]= tmp10 + tmp11; temp[4 + i]= tmp10 - tmp11; - z1= (tmp12 + tmp13)*A1; - temp[2 + i]= tmp13 + z1; - temp[6 + i]= tmp13 - z1; + tmp12 += tmp13; + tmp12 *= A1; + temp[2 + i]= tmp13 + tmp12; + temp[6 + i]= tmp13 - tmp12; + + tmp4 += tmp5; + tmp5 += tmp6; + tmp6 += tmp7; - tmp10= tmp4 + tmp5; - tmp11= tmp5 + tmp6; - tmp12= tmp6 + tmp7; + z2= tmp4*(A2+A5) - tmp6*A5; + z4= tmp6*(A4-A5) + tmp4*A5; - z5= (tmp10 - tmp12) * A5; - z2= tmp10*A2 + z5; - z4= tmp12*A4 + z5; - z3= tmp11*A1; + tmp5*=A1; - z11= tmp7 + z3; - z13= tmp7 - z3; + z11= tmp7 + tmp5; + z13= tmp7 - tmp5; temp[5 + i]= z13 + z2; temp[3 + i]= z13 - z2; @@ -121,11 +112,11 @@ static av_always_inline void row_fdct(FLOAT temp[64], DCTELEM * data) } } -void ff_faandct(DCTELEM * data) +void ff_faandct(int16_t *data) { FLOAT tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7; FLOAT tmp10, tmp11, tmp12, tmp13; - FLOAT z1, z2, z3, z4, z5, z11, z13; + FLOAT z2, z4, z11, z13; FLOAT temp[64]; int i; @@ -148,37 +139,37 @@ void ff_faandct(DCTELEM * data) tmp11= tmp1 + tmp2; tmp12= tmp1 - tmp2; - data[8*0 + i]= lrintf(SCALE(8*0 + i) * (tmp10 + tmp11)); - data[8*4 + i]= lrintf(SCALE(8*4 + i) * (tmp10 - tmp11)); + data[8*0 + i]= lrintf(postscale[8*0 + i] * (tmp10 + tmp11)); + data[8*4 + i]= lrintf(postscale[8*4 + i] * (tmp10 - tmp11)); + + tmp12 += tmp13; + tmp12 *= A1; + data[8*2 + i]= lrintf(postscale[8*2 + i] * (tmp13 + tmp12)); + data[8*6 + i]= lrintf(postscale[8*6 + i] * (tmp13 - tmp12)); - z1= (tmp12 + tmp13)* A1; - data[8*2 + i]= lrintf(SCALE(8*2 + i) * (tmp13 + z1)); - data[8*6 + i]= lrintf(SCALE(8*6 + i) * (tmp13 - z1)); + tmp4 += tmp5; + tmp5 += tmp6; + tmp6 += tmp7; - tmp10= tmp4 + tmp5; - tmp11= tmp5 + tmp6; - tmp12= tmp6 + tmp7; + z2= tmp4*(A2+A5) - tmp6*A5; + z4= tmp6*(A4-A5) + tmp4*A5; - z5= (tmp10 - tmp12) * A5; - z2= tmp10*A2 + z5; - z4= tmp12*A4 + z5; - z3= tmp11*A1; + tmp5*=A1; - z11= tmp7 + z3; - z13= tmp7 - z3; + z11= tmp7 + tmp5; + z13= tmp7 - tmp5; - data[8*5 + i]= lrintf(SCALE(8*5 + i) * (z13 + z2)); - data[8*3 + i]= lrintf(SCALE(8*3 + i) * (z13 - z2)); - data[8*1 + i]= lrintf(SCALE(8*1 + i) * (z11 + z4)); - data[8*7 + i]= lrintf(SCALE(8*7 + i) * (z11 - z4)); + data[8*5 + i]= lrintf(postscale[8*5 + i] * (z13 + z2)); + data[8*3 + i]= lrintf(postscale[8*3 + i] * (z13 - z2)); + data[8*1 + i]= lrintf(postscale[8*1 + i] * (z11 + z4)); + data[8*7 + i]= lrintf(postscale[8*7 + i] * (z11 - z4)); } } -void ff_faandct248(DCTELEM * data) +void ff_faandct248(int16_t *data) { FLOAT tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7; FLOAT tmp10, tmp11, tmp12, tmp13; - FLOAT z1; FLOAT temp[64]; int i; @@ -201,23 +192,25 @@ void ff_faandct248(DCTELEM * data) tmp12 = tmp1 - tmp2; tmp13 = tmp0 - tmp3; - data[8*0 + i] = lrintf(SCALE(8*0 + i) * (tmp10 + tmp11)); - data[8*4 + i] = lrintf(SCALE(8*4 + i) * (tmp10 - tmp11)); + data[8*0 + i] = lrintf(postscale[8*0 + i] * (tmp10 + tmp11)); + data[8*4 + i] = lrintf(postscale[8*4 + i] * (tmp10 - tmp11)); - z1 = (tmp12 + tmp13)* A1; - data[8*2 + i] = lrintf(SCALE(8*2 + i) * (tmp13 + z1)); - data[8*6 + i] = lrintf(SCALE(8*6 + i) * (tmp13 - z1)); + tmp12 += tmp13; + tmp12 *= A1; + data[8*2 + i] = lrintf(postscale[8*2 + i] * (tmp13 + tmp12)); + data[8*6 + i] = lrintf(postscale[8*6 + i] * (tmp13 - tmp12)); tmp10 = tmp4 + tmp7; tmp11 = tmp5 + tmp6; tmp12 = tmp5 - tmp6; tmp13 = tmp4 - tmp7; - data[8*1 + i] = lrintf(SCALE(8*0 + i) * (tmp10 + tmp11)); - data[8*5 + i] = lrintf(SCALE(8*4 + i) * (tmp10 - tmp11)); + data[8*1 + i] = lrintf(postscale[8*0 + i] * (tmp10 + tmp11)); + data[8*5 + i] = lrintf(postscale[8*4 + i] * (tmp10 - tmp11)); - z1 = (tmp12 + tmp13)* A1; - data[8*3 + i] = lrintf(SCALE(8*2 + i) * (tmp13 + z1)); - data[8*7 + i] = lrintf(SCALE(8*6 + i) * (tmp13 - z1)); + tmp12 += tmp13; + tmp12 *= A1; + data[8*3 + i] = lrintf(postscale[8*2 + i] * (tmp13 + tmp12)); + data[8*7 + i] = lrintf(postscale[8*6 + i] * (tmp13 - tmp12)); } }