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113 lines
3.3 KiB
C
113 lines
3.3 KiB
C
/*
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* Bink IDCT algorithm
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* Copyright (c) 2009 Kostya Shishkov
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* Bink IDCT algorithm
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*/
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#include "dsputil.h"
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#define A1 2896 /* (1/sqrt(2))<<12 */
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#define A2 2217
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#define A3 3784
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#define A4 -5352
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#define IDCT_TRANSFORM(dest,s0,s1,s2,s3,s4,s5,s6,s7,d0,d1,d2,d3,d4,d5,d6,d7,munge,src) {\
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const int a0 = (src)[s0] + (src)[s4]; \
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const int a1 = (src)[s0] - (src)[s4]; \
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const int a2 = (src)[s2] + (src)[s6]; \
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const int a3 = (A1*((src)[s2] - (src)[s6])) >> 11; \
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const int a4 = (src)[s5] + (src)[s3]; \
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const int a5 = (src)[s5] - (src)[s3]; \
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const int a6 = (src)[s1] + (src)[s7]; \
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const int a7 = (src)[s1] - (src)[s7]; \
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const int b0 = a4 + a6; \
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const int b1 = (A3*(a5 + a7)) >> 11; \
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const int b2 = ((A4*a5) >> 11) - b0 + b1; \
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const int b3 = (A1*(a6 - a4) >> 11) - b2; \
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const int b4 = ((A2*a7) >> 11) + b3 - b1; \
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(dest)[d0] = munge(a0+a2 +b0); \
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(dest)[d1] = munge(a1+a3-a2+b2); \
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(dest)[d2] = munge(a1-a3+a2+b3); \
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(dest)[d3] = munge(a0-a2 -b4); \
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(dest)[d4] = munge(a0-a2 +b4); \
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(dest)[d5] = munge(a1-a3+a2-b3); \
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(dest)[d6] = munge(a1+a3-a2-b2); \
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(dest)[d7] = munge(a0+a2 -b0); \
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}
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/* end IDCT_TRANSFORM macro */
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#define MUNGE_NONE(x) (x)
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#define IDCT_COL(dest,src) IDCT_TRANSFORM(dest,0,8,16,24,32,40,48,56,0,8,16,24,32,40,48,56,MUNGE_NONE,src)
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#define MUNGE_ROW(x) (((x) + 0x7F)>>8)
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#define IDCT_ROW(dest,src) IDCT_TRANSFORM(dest,0,1,2,3,4,5,6,7,0,1,2,3,4,5,6,7,MUNGE_ROW,src)
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static inline void bink_idct_col(int *dest, const DCTELEM *src)
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{
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if ((src[8]|src[16]|src[24]|src[32]|src[40]|src[48]|src[56])==0) {
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dest[0] =
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dest[8] =
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dest[16] =
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dest[24] =
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dest[32] =
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dest[40] =
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dest[48] =
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dest[56] = src[0];
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} else {
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IDCT_COL(dest, src);
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}
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}
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void ff_bink_idct_c(DCTELEM *block)
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{
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int i;
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int temp[64];
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for (i = 0; i < 8; i++)
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bink_idct_col(&temp[i], &block[i]);
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for (i = 0; i < 8; i++) {
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IDCT_ROW( (&block[8*i]), (&temp[8*i]) );
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}
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}
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void ff_bink_idct_add_c(uint8_t *dest, int linesize, DCTELEM *block)
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{
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int i, j;
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ff_bink_idct_c(block);
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for (i = 0; i < 8; i++, dest += linesize, block += 8)
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for (j = 0; j < 8; j++)
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dest[j] += block[j];
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}
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void ff_bink_idct_put_c(uint8_t *dest, int linesize, DCTELEM *block)
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{
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int i;
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int temp[64];
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for (i = 0; i < 8; i++)
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bink_idct_col(&temp[i], &block[i]);
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for (i = 0; i < 8; i++) {
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IDCT_ROW( (&dest[i*linesize]), (&temp[8*i]) );
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}
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}
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