+++ /dev/null
-/*
- * Simple IDCT
- *
- * Copyright (c) 2001 Michael Niedermayer <michaelni@gmx.at>
- *
- * This library 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 of the License, or (at your option) any later version.
- *
- * This library 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 this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
-
-/**
- * @file simple_idct.c
- * simpleidct in C.
- */
-
-/*
- based upon some outcommented c code from mpeg2dec (idct_mmx.c
- written by Aaron Holtzman <aholtzma@ess.engr.uvic.ca>)
- */
-#include "avcodec.h"
-#include "dsputil.h"
-#include "simple_idct.h"
-
-#if 0
-#define W1 2841 /* 2048*sqrt (2)*cos (1*pi/16) */
-#define W2 2676 /* 2048*sqrt (2)*cos (2*pi/16) */
-#define W3 2408 /* 2048*sqrt (2)*cos (3*pi/16) */
-#define W4 2048 /* 2048*sqrt (2)*cos (4*pi/16) */
-#define W5 1609 /* 2048*sqrt (2)*cos (5*pi/16) */
-#define W6 1108 /* 2048*sqrt (2)*cos (6*pi/16) */
-#define W7 565 /* 2048*sqrt (2)*cos (7*pi/16) */
-#define ROW_SHIFT 8
-#define COL_SHIFT 17
-#else
-#define W1 22725 //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5
-#define W2 21407 //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5
-#define W3 19266 //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5
-#define W4 16383 //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5
-#define W5 12873 //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5
-#define W6 8867 //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5
-#define W7 4520 //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5
-#define ROW_SHIFT 11
-#define COL_SHIFT 20 // 6
-#endif
-
-#if defined(ARCH_POWERPC_405)
-
-/* signed 16x16 -> 32 multiply add accumulate */
-#define MAC16(rt, ra, rb) \
- asm ("maclhw %0, %2, %3" : "=r" (rt) : "0" (rt), "r" (ra), "r" (rb));
-
-/* signed 16x16 -> 32 multiply */
-#define MUL16(rt, ra, rb) \
- asm ("mullhw %0, %1, %2" : "=r" (rt) : "r" (ra), "r" (rb));
-
-#else
-
-/* signed 16x16 -> 32 multiply add accumulate */
-#define MAC16(rt, ra, rb) rt += (ra) * (rb)
-
-/* signed 16x16 -> 32 multiply */
-#define MUL16(rt, ra, rb) rt = (ra) * (rb)
-
-#endif
-
-static inline void idctRowCondDC (DCTELEM * row)
-{
- int a0, a1, a2, a3, b0, b1, b2, b3;
-#ifdef FAST_64BIT
- uint64_t temp;
-#else
- uint32_t temp;
-#endif
-
-#ifdef FAST_64BIT
-#ifdef WORDS_BIGENDIAN
-#define ROW0_MASK 0xffff000000000000LL
-#else
-#define ROW0_MASK 0xffffLL
-#endif
- if(sizeof(DCTELEM)==2){
- if ( ((((uint64_t *)row)[0] & ~ROW0_MASK) |
- ((uint64_t *)row)[1]) == 0) {
- temp = (row[0] << 3) & 0xffff;
- temp += temp << 16;
- temp += temp << 32;
- ((uint64_t *)row)[0] = temp;
- ((uint64_t *)row)[1] = temp;
- return;
- }
- }else{
- if (!(row[1]|row[2]|row[3]|row[4]|row[5]|row[6]|row[7])) {
- row[0]=row[1]=row[2]=row[3]=row[4]=row[5]=row[6]=row[7]= row[0] << 3;
- return;
- }
- }
-#else
- if(sizeof(DCTELEM)==2){
- if (!(((uint32_t*)row)[1] |
- ((uint32_t*)row)[2] |
- ((uint32_t*)row)[3] |
- row[1])) {
- temp = (row[0] << 3) & 0xffff;
- temp += temp << 16;
- ((uint32_t*)row)[0]=((uint32_t*)row)[1] =
- ((uint32_t*)row)[2]=((uint32_t*)row)[3] = temp;
- return;
- }
- }else{
- if (!(row[1]|row[2]|row[3]|row[4]|row[5]|row[6]|row[7])) {
- row[0]=row[1]=row[2]=row[3]=row[4]=row[5]=row[6]=row[7]= row[0] << 3;
- return;
- }
- }
-#endif
-
- a0 = (W4 * row[0]) + (1 << (ROW_SHIFT - 1));
- a1 = a0;
- a2 = a0;
- a3 = a0;
-
- /* no need to optimize : gcc does it */
- a0 += W2 * row[2];
- a1 += W6 * row[2];
- a2 -= W6 * row[2];
- a3 -= W2 * row[2];
-
- MUL16(b0, W1, row[1]);
- MAC16(b0, W3, row[3]);
- MUL16(b1, W3, row[1]);
- MAC16(b1, -W7, row[3]);
- MUL16(b2, W5, row[1]);
- MAC16(b2, -W1, row[3]);
- MUL16(b3, W7, row[1]);
- MAC16(b3, -W5, row[3]);
-
-#ifdef FAST_64BIT
- temp = ((uint64_t*)row)[1];
-#else
- temp = ((uint32_t*)row)[2] | ((uint32_t*)row)[3];
-#endif
- if (temp != 0) {
- a0 += W4*row[4] + W6*row[6];
- a1 += - W4*row[4] - W2*row[6];
- a2 += - W4*row[4] + W2*row[6];
- a3 += W4*row[4] - W6*row[6];
-
- MAC16(b0, W5, row[5]);
- MAC16(b0, W7, row[7]);
-
- MAC16(b1, -W1, row[5]);
- MAC16(b1, -W5, row[7]);
-
- MAC16(b2, W7, row[5]);
- MAC16(b2, W3, row[7]);
-
- MAC16(b3, W3, row[5]);
- MAC16(b3, -W1, row[7]);
- }
-
- row[0] = (a0 + b0) >> ROW_SHIFT;
- row[7] = (a0 - b0) >> ROW_SHIFT;
- row[1] = (a1 + b1) >> ROW_SHIFT;
- row[6] = (a1 - b1) >> ROW_SHIFT;
- row[2] = (a2 + b2) >> ROW_SHIFT;
- row[5] = (a2 - b2) >> ROW_SHIFT;
- row[3] = (a3 + b3) >> ROW_SHIFT;
- row[4] = (a3 - b3) >> ROW_SHIFT;
-}
-
-static inline void idctSparseColPut (uint8_t *dest, int line_size,
- DCTELEM * col)
-{
- int a0, a1, a2, a3, b0, b1, b2, b3;
- uint8_t *cm = cropTbl + MAX_NEG_CROP;
-
- /* XXX: I did that only to give same values as previous code */
- a0 = W4 * (col[8*0] + ((1<<(COL_SHIFT-1))/W4));
- a1 = a0;
- a2 = a0;
- a3 = a0;
-
- a0 += + W2*col[8*2];
- a1 += + W6*col[8*2];
- a2 += - W6*col[8*2];
- a3 += - W2*col[8*2];
-
- MUL16(b0, W1, col[8*1]);
- MUL16(b1, W3, col[8*1]);
- MUL16(b2, W5, col[8*1]);
- MUL16(b3, W7, col[8*1]);
-
- MAC16(b0, + W3, col[8*3]);
- MAC16(b1, - W7, col[8*3]);
- MAC16(b2, - W1, col[8*3]);
- MAC16(b3, - W5, col[8*3]);
-
- if(col[8*4]){
- a0 += + W4*col[8*4];
- a1 += - W4*col[8*4];
- a2 += - W4*col[8*4];
- a3 += + W4*col[8*4];
- }
-
- if (col[8*5]) {
- MAC16(b0, + W5, col[8*5]);
- MAC16(b1, - W1, col[8*5]);
- MAC16(b2, + W7, col[8*5]);
- MAC16(b3, + W3, col[8*5]);
- }
-
- if(col[8*6]){
- a0 += + W6*col[8*6];
- a1 += - W2*col[8*6];
- a2 += + W2*col[8*6];
- a3 += - W6*col[8*6];
- }
-
- if (col[8*7]) {
- MAC16(b0, + W7, col[8*7]);
- MAC16(b1, - W5, col[8*7]);
- MAC16(b2, + W3, col[8*7]);
- MAC16(b3, - W1, col[8*7]);
- }
-
- dest[0] = cm[(a0 + b0) >> COL_SHIFT];
- dest += line_size;
- dest[0] = cm[(a1 + b1) >> COL_SHIFT];
- dest += line_size;
- dest[0] = cm[(a2 + b2) >> COL_SHIFT];
- dest += line_size;
- dest[0] = cm[(a3 + b3) >> COL_SHIFT];
- dest += line_size;
- dest[0] = cm[(a3 - b3) >> COL_SHIFT];
- dest += line_size;
- dest[0] = cm[(a2 - b2) >> COL_SHIFT];
- dest += line_size;
- dest[0] = cm[(a1 - b1) >> COL_SHIFT];
- dest += line_size;
- dest[0] = cm[(a0 - b0) >> COL_SHIFT];
-}
-
-static inline void idctSparseColAdd (uint8_t *dest, int line_size,
- DCTELEM * col)
-{
- int a0, a1, a2, a3, b0, b1, b2, b3;
- uint8_t *cm = cropTbl + MAX_NEG_CROP;
-
- /* XXX: I did that only to give same values as previous code */
- a0 = W4 * (col[8*0] + ((1<<(COL_SHIFT-1))/W4));
- a1 = a0;
- a2 = a0;
- a3 = a0;
-
- a0 += + W2*col[8*2];
- a1 += + W6*col[8*2];
- a2 += - W6*col[8*2];
- a3 += - W2*col[8*2];
-
- MUL16(b0, W1, col[8*1]);
- MUL16(b1, W3, col[8*1]);
- MUL16(b2, W5, col[8*1]);
- MUL16(b3, W7, col[8*1]);
-
- MAC16(b0, + W3, col[8*3]);
- MAC16(b1, - W7, col[8*3]);
- MAC16(b2, - W1, col[8*3]);
- MAC16(b3, - W5, col[8*3]);
-
- if(col[8*4]){
- a0 += + W4*col[8*4];
- a1 += - W4*col[8*4];
- a2 += - W4*col[8*4];
- a3 += + W4*col[8*4];
- }
-
- if (col[8*5]) {
- MAC16(b0, + W5, col[8*5]);
- MAC16(b1, - W1, col[8*5]);
- MAC16(b2, + W7, col[8*5]);
- MAC16(b3, + W3, col[8*5]);
- }
-
- if(col[8*6]){
- a0 += + W6*col[8*6];
- a1 += - W2*col[8*6];
- a2 += + W2*col[8*6];
- a3 += - W6*col[8*6];
- }
-
- if (col[8*7]) {
- MAC16(b0, + W7, col[8*7]);
- MAC16(b1, - W5, col[8*7]);
- MAC16(b2, + W3, col[8*7]);
- MAC16(b3, - W1, col[8*7]);
- }
-
- dest[0] = cm[dest[0] + ((a0 + b0) >> COL_SHIFT)];
- dest += line_size;
- dest[0] = cm[dest[0] + ((a1 + b1) >> COL_SHIFT)];
- dest += line_size;
- dest[0] = cm[dest[0] + ((a2 + b2) >> COL_SHIFT)];
- dest += line_size;
- dest[0] = cm[dest[0] + ((a3 + b3) >> COL_SHIFT)];
- dest += line_size;
- dest[0] = cm[dest[0] + ((a3 - b3) >> COL_SHIFT)];
- dest += line_size;
- dest[0] = cm[dest[0] + ((a2 - b2) >> COL_SHIFT)];
- dest += line_size;
- dest[0] = cm[dest[0] + ((a1 - b1) >> COL_SHIFT)];
- dest += line_size;
- dest[0] = cm[dest[0] + ((a0 - b0) >> COL_SHIFT)];
-}
-
-static inline void idctSparseCol (DCTELEM * col)
-{
- int a0, a1, a2, a3, b0, b1, b2, b3;
-
- /* XXX: I did that only to give same values as previous code */
- a0 = W4 * (col[8*0] + ((1<<(COL_SHIFT-1))/W4));
- a1 = a0;
- a2 = a0;
- a3 = a0;
-
- a0 += + W2*col[8*2];
- a1 += + W6*col[8*2];
- a2 += - W6*col[8*2];
- a3 += - W2*col[8*2];
-
- MUL16(b0, W1, col[8*1]);
- MUL16(b1, W3, col[8*1]);
- MUL16(b2, W5, col[8*1]);
- MUL16(b3, W7, col[8*1]);
-
- MAC16(b0, + W3, col[8*3]);
- MAC16(b1, - W7, col[8*3]);
- MAC16(b2, - W1, col[8*3]);
- MAC16(b3, - W5, col[8*3]);
-
- if(col[8*4]){
- a0 += + W4*col[8*4];
- a1 += - W4*col[8*4];
- a2 += - W4*col[8*4];
- a3 += + W4*col[8*4];
- }
-
- if (col[8*5]) {
- MAC16(b0, + W5, col[8*5]);
- MAC16(b1, - W1, col[8*5]);
- MAC16(b2, + W7, col[8*5]);
- MAC16(b3, + W3, col[8*5]);
- }
-
- if(col[8*6]){
- a0 += + W6*col[8*6];
- a1 += - W2*col[8*6];
- a2 += + W2*col[8*6];
- a3 += - W6*col[8*6];
- }
-
- if (col[8*7]) {
- MAC16(b0, + W7, col[8*7]);
- MAC16(b1, - W5, col[8*7]);
- MAC16(b2, + W3, col[8*7]);
- MAC16(b3, - W1, col[8*7]);
- }
-
- col[0 ] = ((a0 + b0) >> COL_SHIFT);
- col[8 ] = ((a1 + b1) >> COL_SHIFT);
- col[16] = ((a2 + b2) >> COL_SHIFT);
- col[24] = ((a3 + b3) >> COL_SHIFT);
- col[32] = ((a3 - b3) >> COL_SHIFT);
- col[40] = ((a2 - b2) >> COL_SHIFT);
- col[48] = ((a1 - b1) >> COL_SHIFT);
- col[56] = ((a0 - b0) >> COL_SHIFT);
-}
-
-void simple_idct_put(uint8_t *dest, int line_size, DCTELEM *block)
-{
- int i;
- for(i=0; i<8; i++)
- idctRowCondDC(block + i*8);
-
- for(i=0; i<8; i++)
- idctSparseColPut(dest + i, line_size, block + i);
-}
-
-void simple_idct_add(uint8_t *dest, int line_size, DCTELEM *block)
-{
- int i;
- for(i=0; i<8; i++)
- idctRowCondDC(block + i*8);
-
- for(i=0; i<8; i++)
- idctSparseColAdd(dest + i, line_size, block + i);
-}
-
-void simple_idct(DCTELEM *block)
-{
- int i;
- for(i=0; i<8; i++)
- idctRowCondDC(block + i*8);
-
- for(i=0; i<8; i++)
- idctSparseCol(block + i);
-}
-
-/* 2x4x8 idct */
-
-#define CN_SHIFT 12
-#define C_FIX(x) ((int)((x) * (1 << CN_SHIFT) + 0.5))
-#define C1 C_FIX(0.6532814824)
-#define C2 C_FIX(0.2705980501)
-
-/* row idct is multiple by 16 * sqrt(2.0), col idct4 is normalized,
- and the butterfly must be multiplied by 0.5 * sqrt(2.0) */
-#define C_SHIFT (4+1+12)
-
-static inline void idct4col(uint8_t *dest, int line_size, const DCTELEM *col)
-{
- int c0, c1, c2, c3, a0, a1, a2, a3;
- const uint8_t *cm = cropTbl + MAX_NEG_CROP;
-
- a0 = col[8*0];
- a1 = col[8*2];
- a2 = col[8*4];
- a3 = col[8*6];
- c0 = ((a0 + a2) << (CN_SHIFT - 1)) + (1 << (C_SHIFT - 1));
- c2 = ((a0 - a2) << (CN_SHIFT - 1)) + (1 << (C_SHIFT - 1));
- c1 = a1 * C1 + a3 * C2;
- c3 = a1 * C2 - a3 * C1;
- dest[0] = cm[(c0 + c1) >> C_SHIFT];
- dest += line_size;
- dest[0] = cm[(c2 + c3) >> C_SHIFT];
- dest += line_size;
- dest[0] = cm[(c2 - c3) >> C_SHIFT];
- dest += line_size;
- dest[0] = cm[(c0 - c1) >> C_SHIFT];
-}
-
-#define BF(k) \
-{\
- int a0, a1;\
- a0 = ptr[k];\
- a1 = ptr[8 + k];\
- ptr[k] = a0 + a1;\
- ptr[8 + k] = a0 - a1;\
-}
-
-/* only used by DV codec. The input must be interlaced. 128 is added
- to the pixels before clamping to avoid systematic error
- (1024*sqrt(2)) offset would be needed otherwise. */
-/* XXX: I think a 1.0/sqrt(2) normalization should be needed to
- compensate the extra butterfly stage - I don't have the full DV
- specification */
-void simple_idct248_put(uint8_t *dest, int line_size, DCTELEM *block)
-{
- int i;
- DCTELEM *ptr;
-
- /* butterfly */
- ptr = block;
- for(i=0;i<4;i++) {
- BF(0);
- BF(1);
- BF(2);
- BF(3);
- BF(4);
- BF(5);
- BF(6);
- BF(7);
- ptr += 2 * 8;
- }
-
- /* IDCT8 on each line */
- 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_t *dest, int line_size, const DCTELEM *col)
-{
- int c0, c1, c2, c3, a0, a1, a2, a3;
- const uint8_t *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(DCTELEM *row)
-{
- int c0, c1, c2, c3, a0, a1, a2, a3;
- //const uint8_t *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_t *dest, int line_size, DCTELEM *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_t *dest, int line_size, DCTELEM *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);
- }
-}
-
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