mirror of https://git.ffmpeg.org/ffmpeg.git
566 lines
15 KiB
C
566 lines
15 KiB
C
/*
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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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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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 (int16_t * 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 ( ((((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 (!(((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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#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 *dest, int line_size,
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int16_t * col)
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{
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int a0, a1, a2, a3, b0, b1, b2, b3;
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UINT8 *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 *dest, int line_size,
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int16_t * col)
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{
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int a0, a1, a2, a3, b0, b1, b2, b3;
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UINT8 *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 (int16_t * 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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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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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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void simple_idct_put(UINT8 *dest, int line_size, INT16 *block)
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{
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int i;
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for(i=0; i<8; i++)
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idctRowCondDC(block + i*8);
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for(i=0; i<8; i++)
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idctSparseColPut(dest + i, line_size, block + i);
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}
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void simple_idct_add(UINT8 *dest, int line_size, INT16 *block)
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{
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int i;
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for(i=0; i<8; i++)
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idctRowCondDC(block + i*8);
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for(i=0; i<8; i++)
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idctSparseColAdd(dest + i, line_size, block + i);
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}
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void simple_idct(INT16 *block)
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{
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int i;
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for(i=0; i<8; i++)
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idctRowCondDC(block + i*8);
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for(i=0; i<8; i++)
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idctSparseCol(block + i);
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}
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/* 2x4x8 idct */
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#define CN_SHIFT 12
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#define C_FIX(x) ((int)((x) * (1 << CN_SHIFT) + 0.5))
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#define C1 C_FIX(0.6532814824)
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#define C2 C_FIX(0.2705980501)
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/* row idct is multiple by 16 * sqrt(2.0), col idct4 is normalized,
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and the butterfly must be multiplied by 0.5 * sqrt(2.0) */
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#define C_SHIFT (4+1+12)
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static inline void idct4col(UINT8 *dest, int line_size, const INT16 *col)
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{
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int c0, c1, c2, c3, a0, a1, a2, a3;
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const UINT8 *cm = cropTbl + MAX_NEG_CROP;
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a0 = col[8*0];
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a1 = col[8*2];
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a2 = col[8*4];
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a3 = col[8*6];
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c0 = ((a0 + a2) << (CN_SHIFT - 1)) + (1 << (C_SHIFT - 1));
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c2 = ((a0 - a2) << (CN_SHIFT - 1)) + (1 << (C_SHIFT - 1));
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c1 = a1 * C1 + a3 * C2;
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c3 = a1 * C2 - a3 * C1;
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dest[0] = cm[(c0 + c1) >> C_SHIFT];
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dest += line_size;
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dest[0] = cm[(c2 + c3) >> C_SHIFT];
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dest += line_size;
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dest[0] = cm[(c2 - c3) >> C_SHIFT];
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dest += line_size;
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dest[0] = cm[(c0 - c1) >> C_SHIFT];
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}
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#define BF(k) \
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{\
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int a0, a1;\
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a0 = ptr[k];\
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a1 = ptr[8 + k];\
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ptr[k] = a0 + a1;\
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ptr[8 + k] = a0 - a1;\
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}
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/* only used by DV codec. The input must be interlaced. 128 is added
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to the pixels before clamping to avoid systematic error
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(1024*sqrt(2)) offset would be needed otherwise. */
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|
/* XXX: I think a 1.0/sqrt(2) normalization should be needed to
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|
compensate the extra butterfly stage - I don't have the full DV
|
|
specification */
|
|
void simple_idct248_put(UINT8 *dest, int line_size, INT16 *block)
|
|
{
|
|
int i;
|
|
INT16 *ptr;
|
|
|
|
/* butterfly */
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|
ptr = block;
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|
for(i=0;i<4;i++) {
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|
BF(0);
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|
BF(1);
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|
BF(2);
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|
BF(3);
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|
BF(4);
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|
BF(5);
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|
BF(6);
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|
BF(7);
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|
ptr += 2 * 8;
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|
}
|
|
|
|
/* IDCT8 on each line */
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|
for(i=0; i<8; i++) {
|
|
idctRowCondDC(block + i*8);
|
|
}
|
|
|
|
/* IDCT4 and store */
|
|
for(i=0;i<8;i++) {
|
|
idct4col(dest + i, 2 * line_size, block + i);
|
|
idct4col(dest + line_size + i, 2 * line_size, block + 8 + i);
|
|
}
|
|
}
|
|
|
|
/* 8x4 & 4x8 WMV2 IDCT */
|
|
#undef CN_SHIFT
|
|
#undef C_SHIFT
|
|
#undef C_FIX
|
|
#undef C1
|
|
#undef C2
|
|
#define CN_SHIFT 12
|
|
#define C_FIX(x) ((int)((x) * 1.414213562 * (1 << CN_SHIFT) + 0.5))
|
|
#define C1 C_FIX(0.6532814824)
|
|
#define C2 C_FIX(0.2705980501)
|
|
#define C3 C_FIX(0.5)
|
|
#define C_SHIFT (4+1+12)
|
|
static inline void idct4col_add(UINT8 *dest, int line_size, const INT16 *col)
|
|
{
|
|
int c0, c1, c2, c3, a0, a1, a2, a3;
|
|
const UINT8 *cm = cropTbl + MAX_NEG_CROP;
|
|
|
|
a0 = col[8*0];
|
|
a1 = col[8*1];
|
|
a2 = col[8*2];
|
|
a3 = col[8*3];
|
|
c0 = (a0 + a2)*C3 + (1 << (C_SHIFT - 1));
|
|
c2 = (a0 - a2)*C3 + (1 << (C_SHIFT - 1));
|
|
c1 = a1 * C1 + a3 * C2;
|
|
c3 = a1 * C2 - a3 * C1;
|
|
dest[0] = cm[dest[0] + ((c0 + c1) >> C_SHIFT)];
|
|
dest += line_size;
|
|
dest[0] = cm[dest[0] + ((c2 + c3) >> C_SHIFT)];
|
|
dest += line_size;
|
|
dest[0] = cm[dest[0] + ((c2 - c3) >> C_SHIFT)];
|
|
dest += line_size;
|
|
dest[0] = cm[dest[0] + ((c0 - c1) >> C_SHIFT)];
|
|
}
|
|
|
|
#define RN_SHIFT 15
|
|
#define R_FIX(x) ((int)((x) * 1.414213562 * (1 << RN_SHIFT) + 0.5))
|
|
#define R1 R_FIX(0.6532814824)
|
|
#define R2 R_FIX(0.2705980501)
|
|
#define R3 R_FIX(0.5)
|
|
#define R_SHIFT 11
|
|
static inline void idct4row(INT16 *row)
|
|
{
|
|
int c0, c1, c2, c3, a0, a1, a2, a3;
|
|
const UINT8 *cm = cropTbl + MAX_NEG_CROP;
|
|
|
|
a0 = row[0];
|
|
a1 = row[1];
|
|
a2 = row[2];
|
|
a3 = row[3];
|
|
c0 = (a0 + a2)*R3 + (1 << (R_SHIFT - 1));
|
|
c2 = (a0 - a2)*R3 + (1 << (R_SHIFT - 1));
|
|
c1 = a1 * R1 + a3 * R2;
|
|
c3 = a1 * R2 - a3 * R1;
|
|
row[0]= (c0 + c1) >> R_SHIFT;
|
|
row[1]= (c2 + c3) >> R_SHIFT;
|
|
row[2]= (c2 - c3) >> R_SHIFT;
|
|
row[3]= (c0 - c1) >> R_SHIFT;
|
|
}
|
|
|
|
void simple_idct84_add(UINT8 *dest, int line_size, INT16 *block)
|
|
{
|
|
int i;
|
|
|
|
/* IDCT8 on each line */
|
|
for(i=0; i<4; i++) {
|
|
idctRowCondDC(block + i*8);
|
|
}
|
|
|
|
/* IDCT4 and store */
|
|
for(i=0;i<8;i++) {
|
|
idct4col_add(dest + i, line_size, block + i);
|
|
}
|
|
}
|
|
|
|
void simple_idct48_add(UINT8 *dest, int line_size, INT16 *block)
|
|
{
|
|
int i;
|
|
|
|
/* IDCT4 on each line */
|
|
for(i=0; i<8; i++) {
|
|
idct4row(block + i*8);
|
|
}
|
|
|
|
/* IDCT8 and store */
|
|
for(i=0; i<4; i++){
|
|
idctSparseColAdd(dest + i, line_size, block + i);
|
|
}
|
|
}
|
|
|