ffmpeg / libavcodec / simple_idct.c @ 5509bffa
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/*
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* Simple IDCT
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*
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* Copyright (c) 2001 Michael Niedermayer <michaelni@gmx.at>
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*
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* This library 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 of the License, or (at your option) any later version.
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*
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* This library 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 this library; 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 simple_idct.c
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* simpleidct in C.
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*/
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/*
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based upon some outcommented c code from mpeg2dec (idct_mmx.c
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written by Aaron Holtzman <aholtzma@ess.engr.uvic.ca>)
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*/
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#include "avcodec.h" |
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#include "dsputil.h" |
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#include "simple_idct.h" |
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#if 0
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#define W1 2841 /* 2048*sqrt (2)*cos (1*pi/16) */
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#define W2 2676 /* 2048*sqrt (2)*cos (2*pi/16) */
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#define W3 2408 /* 2048*sqrt (2)*cos (3*pi/16) */
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#define W4 2048 /* 2048*sqrt (2)*cos (4*pi/16) */
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#define W5 1609 /* 2048*sqrt (2)*cos (5*pi/16) */
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#define W6 1108 /* 2048*sqrt (2)*cos (6*pi/16) */
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#define W7 565 /* 2048*sqrt (2)*cos (7*pi/16) */
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#define ROW_SHIFT 8
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#define COL_SHIFT 17
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#else
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#define W1 22725 //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5 |
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#define W2 21407 //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5 |
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#define W3 19266 //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5 |
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#define W4 16383 //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5 |
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#define W5 12873 //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5 |
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#define W6 8867 //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5 |
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#define W7 4520 //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5 |
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#define ROW_SHIFT 11 |
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#define COL_SHIFT 20 // 6 |
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#endif
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#if defined(ARCH_POWERPC_405)
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/* signed 16x16 -> 32 multiply add accumulate */
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#define MAC16(rt, ra, rb) \
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asm ("maclhw %0, %2, %3" : "=r" (rt) : "0" (rt), "r" (ra), "r" (rb)); |
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/* signed 16x16 -> 32 multiply */
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#define MUL16(rt, ra, rb) \
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asm ("mullhw %0, %1, %2" : "=r" (rt) : "r" (ra), "r" (rb)); |
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#else
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/* signed 16x16 -> 32 multiply add accumulate */
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#define MAC16(rt, ra, rb) rt += (ra) * (rb)
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/* signed 16x16 -> 32 multiply */
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#define MUL16(rt, ra, rb) rt = (ra) * (rb)
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#endif
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static inline void idctRowCondDC (DCTELEM * row) |
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{
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int a0, a1, a2, a3, b0, b1, b2, b3;
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#ifdef FAST_64BIT
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uint64_t temp; |
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#else
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uint32_t temp; |
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#endif
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#ifdef FAST_64BIT
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#ifdef WORDS_BIGENDIAN
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#define ROW0_MASK 0xffff000000000000LL |
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#else
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#define ROW0_MASK 0xffffLL |
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#endif
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if(sizeof(DCTELEM)==2){ |
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if ( ((((uint64_t *)row)[0] & ~ROW0_MASK) | |
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((uint64_t *)row)[1]) == 0) { |
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temp = (row[0] << 3) & 0xffff; |
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temp += temp << 16;
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temp += temp << 32;
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((uint64_t *)row)[0] = temp;
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((uint64_t *)row)[1] = temp;
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return;
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} |
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}else{
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if (!(row[1]|row[2]|row[3]|row[4]|row[5]|row[6]|row[7])) { |
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row[0]=row[1]=row[2]=row[3]=row[4]=row[5]=row[6]=row[7]= row[0] << 3; |
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return;
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} |
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} |
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#else
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if(sizeof(DCTELEM)==2){ |
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if (!(((uint32_t*)row)[1] | |
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((uint32_t*)row)[2] |
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((uint32_t*)row)[3] |
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row[1])) {
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temp = (row[0] << 3) & 0xffff; |
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temp += temp << 16;
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((uint32_t*)row)[0]=((uint32_t*)row)[1] = |
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((uint32_t*)row)[2]=((uint32_t*)row)[3] = temp; |
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return;
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} |
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}else{
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if (!(row[1]|row[2]|row[3]|row[4]|row[5]|row[6]|row[7])) { |
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row[0]=row[1]=row[2]=row[3]=row[4]=row[5]=row[6]=row[7]= row[0] << 3; |
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return;
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} |
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} |
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#endif
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a0 = (W4 * row[0]) + (1 << (ROW_SHIFT - 1)); |
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a1 = a0; |
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a2 = a0; |
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a3 = a0; |
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/* no need to optimize : gcc does it */
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a0 += W2 * row[2];
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a1 += W6 * row[2];
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a2 -= W6 * row[2];
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a3 -= W2 * row[2];
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MUL16(b0, W1, row[1]);
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MAC16(b0, W3, row[3]);
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MUL16(b1, W3, row[1]);
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MAC16(b1, -W7, row[3]);
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MUL16(b2, W5, row[1]);
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MAC16(b2, -W1, row[3]);
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MUL16(b3, W7, row[1]);
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MAC16(b3, -W5, row[3]);
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#ifdef FAST_64BIT
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temp = ((uint64_t*)row)[1];
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#else
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temp = ((uint32_t*)row)[2] | ((uint32_t*)row)[3]; |
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#endif
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if (temp != 0) { |
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a0 += W4*row[4] + W6*row[6]; |
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a1 += - W4*row[4] - W2*row[6]; |
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a2 += - W4*row[4] + W2*row[6]; |
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a3 += W4*row[4] - W6*row[6]; |
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MAC16(b0, W5, row[5]);
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MAC16(b0, W7, row[7]);
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MAC16(b1, -W1, row[5]);
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MAC16(b1, -W5, row[7]);
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MAC16(b2, W7, row[5]);
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MAC16(b2, W3, row[7]);
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MAC16(b3, W3, row[5]);
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MAC16(b3, -W1, row[7]);
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} |
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row[0] = (a0 + b0) >> ROW_SHIFT;
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row[7] = (a0 - b0) >> ROW_SHIFT;
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row[1] = (a1 + b1) >> ROW_SHIFT;
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row[6] = (a1 - b1) >> ROW_SHIFT;
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row[2] = (a2 + b2) >> ROW_SHIFT;
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row[5] = (a2 - b2) >> ROW_SHIFT;
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row[3] = (a3 + b3) >> ROW_SHIFT;
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row[4] = (a3 - b3) >> ROW_SHIFT;
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} |
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static inline void idctSparseColPut (uint8_t *dest, int line_size, |
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DCTELEM * col) |
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{
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int a0, a1, a2, a3, b0, b1, b2, b3;
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uint8_t *cm = cropTbl + MAX_NEG_CROP; |
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/* XXX: I did that only to give same values as previous code */
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a0 = W4 * (col[8*0] + ((1<<(COL_SHIFT-1))/W4)); |
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a1 = a0; |
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a2 = a0; |
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a3 = a0; |
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a0 += + W2*col[8*2]; |
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a1 += + W6*col[8*2]; |
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a2 += - W6*col[8*2]; |
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a3 += - W2*col[8*2]; |
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MUL16(b0, W1, col[8*1]); |
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MUL16(b1, W3, col[8*1]); |
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MUL16(b2, W5, col[8*1]); |
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MUL16(b3, W7, col[8*1]); |
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MAC16(b0, + W3, col[8*3]); |
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MAC16(b1, - W7, col[8*3]); |
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MAC16(b2, - W1, col[8*3]); |
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MAC16(b3, - W5, col[8*3]); |
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if(col[8*4]){ |
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a0 += + W4*col[8*4]; |
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a1 += - W4*col[8*4]; |
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a2 += - W4*col[8*4]; |
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a3 += + W4*col[8*4]; |
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} |
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if (col[8*5]) { |
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MAC16(b0, + W5, col[8*5]); |
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MAC16(b1, - W1, col[8*5]); |
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MAC16(b2, + W7, col[8*5]); |
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MAC16(b3, + W3, col[8*5]); |
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} |
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if(col[8*6]){ |
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a0 += + W6*col[8*6]; |
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a1 += - W2*col[8*6]; |
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a2 += + W2*col[8*6]; |
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a3 += - W6*col[8*6]; |
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} |
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if (col[8*7]) { |
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MAC16(b0, + W7, col[8*7]); |
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MAC16(b1, - W5, col[8*7]); |
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MAC16(b2, + W3, col[8*7]); |
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MAC16(b3, - W1, col[8*7]); |
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} |
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dest[0] = cm[(a0 + b0) >> COL_SHIFT];
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dest += line_size; |
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dest[0] = cm[(a1 + b1) >> COL_SHIFT];
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dest += line_size; |
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dest[0] = cm[(a2 + b2) >> COL_SHIFT];
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dest += line_size; |
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dest[0] = cm[(a3 + b3) >> COL_SHIFT];
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dest += line_size; |
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dest[0] = cm[(a3 - b3) >> COL_SHIFT];
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dest += line_size; |
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dest[0] = cm[(a2 - b2) >> COL_SHIFT];
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dest += line_size; |
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dest[0] = cm[(a1 - b1) >> COL_SHIFT];
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dest += line_size; |
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dest[0] = cm[(a0 - b0) >> COL_SHIFT];
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} |
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static inline void idctSparseColAdd (uint8_t *dest, int line_size, |
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DCTELEM * col) |
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{
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int a0, a1, a2, a3, b0, b1, b2, b3;
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uint8_t *cm = cropTbl + MAX_NEG_CROP; |
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/* XXX: I did that only to give same values as previous code */
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a0 = W4 * (col[8*0] + ((1<<(COL_SHIFT-1))/W4)); |
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a1 = a0; |
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a2 = a0; |
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a3 = a0; |
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a0 += + W2*col[8*2]; |
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a1 += + W6*col[8*2]; |
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a2 += - W6*col[8*2]; |
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a3 += - W2*col[8*2]; |
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MUL16(b0, W1, col[8*1]); |
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MUL16(b1, W3, col[8*1]); |
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MUL16(b2, W5, col[8*1]); |
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MUL16(b3, W7, col[8*1]); |
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MAC16(b0, + W3, col[8*3]); |
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MAC16(b1, - W7, col[8*3]); |
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MAC16(b2, - W1, col[8*3]); |
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MAC16(b3, - W5, col[8*3]); |
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if(col[8*4]){ |
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a0 += + W4*col[8*4]; |
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a1 += - W4*col[8*4]; |
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a2 += - W4*col[8*4]; |
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a3 += + W4*col[8*4]; |
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} |
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if (col[8*5]) { |
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MAC16(b0, + W5, col[8*5]); |
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MAC16(b1, - W1, col[8*5]); |
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MAC16(b2, + W7, col[8*5]); |
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MAC16(b3, + W3, col[8*5]); |
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} |
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if(col[8*6]){ |
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a0 += + W6*col[8*6]; |
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a1 += - W2*col[8*6]; |
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a2 += + W2*col[8*6]; |
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a3 += - W6*col[8*6]; |
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} |
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if (col[8*7]) { |
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MAC16(b0, + W7, col[8*7]); |
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MAC16(b1, - W5, col[8*7]); |
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MAC16(b2, + W3, col[8*7]); |
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MAC16(b3, - W1, col[8*7]); |
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} |
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dest[0] = cm[dest[0] + ((a0 + b0) >> COL_SHIFT)]; |
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dest += line_size; |
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dest[0] = cm[dest[0] + ((a1 + b1) >> COL_SHIFT)]; |
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dest += line_size; |
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dest[0] = cm[dest[0] + ((a2 + b2) >> COL_SHIFT)]; |
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dest += line_size; |
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dest[0] = cm[dest[0] + ((a3 + b3) >> COL_SHIFT)]; |
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dest += line_size; |
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dest[0] = cm[dest[0] + ((a3 - b3) >> COL_SHIFT)]; |
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dest += line_size; |
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dest[0] = cm[dest[0] + ((a2 - b2) >> COL_SHIFT)]; |
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dest += line_size; |
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dest[0] = cm[dest[0] + ((a1 - b1) >> COL_SHIFT)]; |
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dest += line_size; |
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dest[0] = cm[dest[0] + ((a0 - b0) >> COL_SHIFT)]; |
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} |
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static inline void idctSparseCol (DCTELEM * col) |
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{
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int a0, a1, a2, a3, b0, b1, b2, b3;
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/* XXX: I did that only to give same values as previous code */
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a0 = W4 * (col[8*0] + ((1<<(COL_SHIFT-1))/W4)); |
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a1 = a0; |
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a2 = a0; |
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a3 = a0; |
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a0 += + W2*col[8*2]; |
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a1 += + W6*col[8*2]; |
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a2 += - W6*col[8*2]; |
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a3 += - W2*col[8*2]; |
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MUL16(b0, W1, col[8*1]); |
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MUL16(b1, W3, col[8*1]); |
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MUL16(b2, W5, col[8*1]); |
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MUL16(b3, W7, col[8*1]); |
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MAC16(b0, + W3, col[8*3]); |
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MAC16(b1, - W7, col[8*3]); |
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MAC16(b2, - W1, col[8*3]); |
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MAC16(b3, - W5, col[8*3]); |
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|
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if(col[8*4]){ |
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a0 += + W4*col[8*4]; |
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a1 += - W4*col[8*4]; |
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a2 += - W4*col[8*4]; |
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a3 += + W4*col[8*4]; |
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} |
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|
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if (col[8*5]) { |
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MAC16(b0, + W5, col[8*5]); |
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MAC16(b1, - W1, col[8*5]); |
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MAC16(b2, + W7, col[8*5]); |
| 361 |
MAC16(b3, + W3, col[8*5]); |
| 362 |
} |
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|
| 364 |
if(col[8*6]){ |
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a0 += + W6*col[8*6]; |
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a1 += - W2*col[8*6]; |
| 367 |
a2 += + W2*col[8*6]; |
| 368 |
a3 += - W6*col[8*6]; |
| 369 |
} |
| 370 |
|
| 371 |
if (col[8*7]) { |
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MAC16(b0, + W7, col[8*7]); |
| 373 |
MAC16(b1, - W5, col[8*7]); |
| 374 |
MAC16(b2, + W3, col[8*7]); |
| 375 |
MAC16(b3, - W1, col[8*7]); |
| 376 |
} |
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col[0 ] = ((a0 + b0) >> COL_SHIFT);
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col[8 ] = ((a1 + b1) >> COL_SHIFT);
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col[16] = ((a2 + b2) >> COL_SHIFT);
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col[24] = ((a3 + b3) >> COL_SHIFT);
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col[32] = ((a3 - b3) >> COL_SHIFT);
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col[40] = ((a2 - b2) >> COL_SHIFT);
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col[48] = ((a1 - b1) >> COL_SHIFT);
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col[56] = ((a0 - b0) >> COL_SHIFT);
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} |
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|
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void simple_idct_put(uint8_t *dest, int line_size, DCTELEM *block) |
| 389 |
{
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int i;
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| 391 |
for(i=0; i<8; i++) |
| 392 |
idctRowCondDC(block + i*8);
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|
| 394 |
for(i=0; i<8; i++) |
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idctSparseColPut(dest + i, line_size, block + i); |
| 396 |
} |
| 397 |
|
| 398 |
void simple_idct_add(uint8_t *dest, int line_size, DCTELEM *block) |
| 399 |
{
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int i;
|
| 401 |
for(i=0; i<8; i++) |
| 402 |
idctRowCondDC(block + i*8);
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|
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for(i=0; i<8; i++) |
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idctSparseColAdd(dest + i, line_size, block + i); |
| 406 |
} |
| 407 |
|
| 408 |
void simple_idct(DCTELEM *block)
|
| 409 |
{
|
| 410 |
int i;
|
| 411 |
for(i=0; i<8; i++) |
| 412 |
idctRowCondDC(block + i*8);
|
| 413 |
|
| 414 |
for(i=0; i<8; i++) |
| 415 |
idctSparseCol(block + i); |
| 416 |
} |
| 417 |
|
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/* 2x4x8 idct */
|
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|
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#define CN_SHIFT 12 |
| 421 |
#define C_FIX(x) ((int)((x) * (1 << CN_SHIFT) + 0.5)) |
| 422 |
#define C1 C_FIX(0.6532814824) |
| 423 |
#define C2 C_FIX(0.2705980501) |
| 424 |
|
| 425 |
/* row idct is multiple by 16 * sqrt(2.0), col idct4 is normalized,
|
| 426 |
and the butterfly must be multiplied by 0.5 * sqrt(2.0) */
|
| 427 |
#define C_SHIFT (4+1+12) |
| 428 |
|
| 429 |
static inline void idct4col(uint8_t *dest, int line_size, const DCTELEM *col) |
| 430 |
{
|
| 431 |
int c0, c1, c2, c3, a0, a1, a2, a3;
|
| 432 |
const uint8_t *cm = cropTbl + MAX_NEG_CROP;
|
| 433 |
|
| 434 |
a0 = col[8*0]; |
| 435 |
a1 = col[8*2]; |
| 436 |
a2 = col[8*4]; |
| 437 |
a3 = col[8*6]; |
| 438 |
c0 = ((a0 + a2) << (CN_SHIFT - 1)) + (1 << (C_SHIFT - 1)); |
| 439 |
c2 = ((a0 - a2) << (CN_SHIFT - 1)) + (1 << (C_SHIFT - 1)); |
| 440 |
c1 = a1 * C1 + a3 * C2; |
| 441 |
c3 = a1 * C2 - a3 * C1; |
| 442 |
dest[0] = cm[(c0 + c1) >> C_SHIFT];
|
| 443 |
dest += line_size; |
| 444 |
dest[0] = cm[(c2 + c3) >> C_SHIFT];
|
| 445 |
dest += line_size; |
| 446 |
dest[0] = cm[(c2 - c3) >> C_SHIFT];
|
| 447 |
dest += line_size; |
| 448 |
dest[0] = cm[(c0 - c1) >> C_SHIFT];
|
| 449 |
} |
| 450 |
|
| 451 |
#define BF(k) \
|
| 452 |
{\
|
| 453 |
int a0, a1;\
|
| 454 |
a0 = ptr[k];\ |
| 455 |
a1 = ptr[8 + k];\
|
| 456 |
ptr[k] = a0 + a1;\ |
| 457 |
ptr[8 + k] = a0 - a1;\
|
| 458 |
} |
| 459 |
|
| 460 |
/* only used by DV codec. The input must be interlaced. 128 is added
|
| 461 |
to the pixels before clamping to avoid systematic error
|
| 462 |
(1024*sqrt(2)) offset would be needed otherwise. */
|
| 463 |
/* XXX: I think a 1.0/sqrt(2) normalization should be needed to
|
| 464 |
compensate the extra butterfly stage - I don't have the full DV
|
| 465 |
specification */
|
| 466 |
void simple_idct248_put(uint8_t *dest, int line_size, DCTELEM *block) |
| 467 |
{
|
| 468 |
int i;
|
| 469 |
DCTELEM *ptr; |
| 470 |
|
| 471 |
/* butterfly */
|
| 472 |
ptr = block; |
| 473 |
for(i=0;i<4;i++) { |
| 474 |
BF(0);
|
| 475 |
BF(1);
|
| 476 |
BF(2);
|
| 477 |
BF(3);
|
| 478 |
BF(4);
|
| 479 |
BF(5);
|
| 480 |
BF(6);
|
| 481 |
BF(7);
|
| 482 |
ptr += 2 * 8; |
| 483 |
} |
| 484 |
|
| 485 |
/* IDCT8 on each line */
|
| 486 |
for(i=0; i<8; i++) { |
| 487 |
idctRowCondDC(block + i*8);
|
| 488 |
} |
| 489 |
|
| 490 |
/* IDCT4 and store */
|
| 491 |
for(i=0;i<8;i++) { |
| 492 |
idct4col(dest + i, 2 * line_size, block + i);
|
| 493 |
idct4col(dest + line_size + i, 2 * line_size, block + 8 + i); |
| 494 |
} |
| 495 |
} |
| 496 |
|
| 497 |
/* 8x4 & 4x8 WMV2 IDCT */
|
| 498 |
#undef CN_SHIFT
|
| 499 |
#undef C_SHIFT
|
| 500 |
#undef C_FIX
|
| 501 |
#undef C1
|
| 502 |
#undef C2
|
| 503 |
#define CN_SHIFT 12 |
| 504 |
#define C_FIX(x) ((int)((x) * 1.414213562 * (1 << CN_SHIFT) + 0.5)) |
| 505 |
#define C1 C_FIX(0.6532814824) |
| 506 |
#define C2 C_FIX(0.2705980501) |
| 507 |
#define C3 C_FIX(0.5) |
| 508 |
#define C_SHIFT (4+1+12) |
| 509 |
static inline void idct4col_add(uint8_t *dest, int line_size, const DCTELEM *col) |
| 510 |
{
|
| 511 |
int c0, c1, c2, c3, a0, a1, a2, a3;
|
| 512 |
const uint8_t *cm = cropTbl + MAX_NEG_CROP;
|
| 513 |
|
| 514 |
a0 = col[8*0]; |
| 515 |
a1 = col[8*1]; |
| 516 |
a2 = col[8*2]; |
| 517 |
a3 = col[8*3]; |
| 518 |
c0 = (a0 + a2)*C3 + (1 << (C_SHIFT - 1)); |
| 519 |
c2 = (a0 - a2)*C3 + (1 << (C_SHIFT - 1)); |
| 520 |
c1 = a1 * C1 + a3 * C2; |
| 521 |
c3 = a1 * C2 - a3 * C1; |
| 522 |
dest[0] = cm[dest[0] + ((c0 + c1) >> C_SHIFT)]; |
| 523 |
dest += line_size; |
| 524 |
dest[0] = cm[dest[0] + ((c2 + c3) >> C_SHIFT)]; |
| 525 |
dest += line_size; |
| 526 |
dest[0] = cm[dest[0] + ((c2 - c3) >> C_SHIFT)]; |
| 527 |
dest += line_size; |
| 528 |
dest[0] = cm[dest[0] + ((c0 - c1) >> C_SHIFT)]; |
| 529 |
} |
| 530 |
|
| 531 |
#define RN_SHIFT 15 |
| 532 |
#define R_FIX(x) ((int)((x) * 1.414213562 * (1 << RN_SHIFT) + 0.5)) |
| 533 |
#define R1 R_FIX(0.6532814824) |
| 534 |
#define R2 R_FIX(0.2705980501) |
| 535 |
#define R3 R_FIX(0.5) |
| 536 |
#define R_SHIFT 11 |
| 537 |
static inline void idct4row(DCTELEM *row) |
| 538 |
{
|
| 539 |
int c0, c1, c2, c3, a0, a1, a2, a3;
|
| 540 |
//const uint8_t *cm = cropTbl + MAX_NEG_CROP;
|
| 541 |
|
| 542 |
a0 = row[0];
|
| 543 |
a1 = row[1];
|
| 544 |
a2 = row[2];
|
| 545 |
a3 = row[3];
|
| 546 |
c0 = (a0 + a2)*R3 + (1 << (R_SHIFT - 1)); |
| 547 |
c2 = (a0 - a2)*R3 + (1 << (R_SHIFT - 1)); |
| 548 |
c1 = a1 * R1 + a3 * R2; |
| 549 |
c3 = a1 * R2 - a3 * R1; |
| 550 |
row[0]= (c0 + c1) >> R_SHIFT;
|
| 551 |
row[1]= (c2 + c3) >> R_SHIFT;
|
| 552 |
row[2]= (c2 - c3) >> R_SHIFT;
|
| 553 |
row[3]= (c0 - c1) >> R_SHIFT;
|
| 554 |
} |
| 555 |
|
| 556 |
void simple_idct84_add(uint8_t *dest, int line_size, DCTELEM *block) |
| 557 |
{
|
| 558 |
int i;
|
| 559 |
|
| 560 |
/* IDCT8 on each line */
|
| 561 |
for(i=0; i<4; i++) { |
| 562 |
idctRowCondDC(block + i*8);
|
| 563 |
} |
| 564 |
|
| 565 |
/* IDCT4 and store */
|
| 566 |
for(i=0;i<8;i++) { |
| 567 |
idct4col_add(dest + i, line_size, block + i); |
| 568 |
} |
| 569 |
} |
| 570 |
|
| 571 |
void simple_idct48_add(uint8_t *dest, int line_size, DCTELEM *block) |
| 572 |
{
|
| 573 |
int i;
|
| 574 |
|
| 575 |
/* IDCT4 on each line */
|
| 576 |
for(i=0; i<8; i++) { |
| 577 |
idct4row(block + i*8);
|
| 578 |
} |
| 579 |
|
| 580 |
/* IDCT8 and store */
|
| 581 |
for(i=0; i<4; i++){ |
| 582 |
idctSparseColAdd(dest + i, line_size, block + i); |
| 583 |
} |
| 584 |
} |
| 585 |
|