mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-08-20 08:15:06 +02:00
511 lines
12 KiB
C
511 lines
12 KiB
C
/*
|
|
* 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
|
|
*/
|
|
/*
|
|
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
|
|
|
|
#ifdef ARCH_ALPHA
|
|
#define FAST_64BIT
|
|
#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
|
|
|
|
#ifdef ARCH_ALPHA
|
|
/* 0: all entries 0, 1: only first entry nonzero, 2: otherwise */
|
|
static inline int idctRowCondDC(int16_t *row)
|
|
{
|
|
int_fast32_t a0, a1, a2, a3, b0, b1, b2, b3;
|
|
uint64_t *lrow = (uint64_t *) row;
|
|
|
|
if (lrow[1] == 0) {
|
|
if (lrow[0] == 0)
|
|
return 0;
|
|
if ((lrow[0] & ~0xffffULL) == 0) {
|
|
uint64_t v;
|
|
|
|
a0 = W4 * row[0];
|
|
a0 += 1 << (ROW_SHIFT - 1);
|
|
a0 >>= ROW_SHIFT;
|
|
v = (uint16_t) a0;
|
|
v += v << 16;
|
|
v += v << 32;
|
|
lrow[0] = v;
|
|
lrow[1] = v;
|
|
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
a0 = (W4 * row[0]) + (1 << (ROW_SHIFT - 1));
|
|
a1 = a0;
|
|
a2 = a0;
|
|
a3 = a0;
|
|
|
|
if (row[2]) {
|
|
a0 += W2 * row[2];
|
|
a1 += W6 * row[2];
|
|
a2 -= W6 * row[2];
|
|
a3 -= W2 * row[2];
|
|
}
|
|
|
|
if (row[4]) {
|
|
a0 += W4 * row[4];
|
|
a1 -= W4 * row[4];
|
|
a2 -= W4 * row[4];
|
|
a3 += W4 * row[4];
|
|
}
|
|
|
|
if (row[6]) {
|
|
a0 += W6 * row[6];
|
|
a1 -= W2 * row[6];
|
|
a2 += W2 * row[6];
|
|
a3 -= W6 * row[6];
|
|
}
|
|
|
|
if (row[1]) {
|
|
b0 = W1 * row[1];
|
|
b1 = W3 * row[1];
|
|
b2 = W5 * row[1];
|
|
b3 = W7 * row[1];
|
|
} else {
|
|
b0 = 0;
|
|
b1 = 0;
|
|
b2 = 0;
|
|
b3 = 0;
|
|
}
|
|
|
|
if (row[3]) {
|
|
b0 += W3 * row[3];
|
|
b1 -= W7 * row[3];
|
|
b2 -= W1 * row[3];
|
|
b3 -= W5 * row[3];
|
|
}
|
|
|
|
if (row[5]) {
|
|
b0 += W5 * row[5];
|
|
b1 -= W1 * row[5];
|
|
b2 += W7 * row[5];
|
|
b3 += W3 * row[5];
|
|
}
|
|
|
|
if (row[7]) {
|
|
b0 += W7 * row[7];
|
|
b1 -= W5 * row[7];
|
|
b2 += W3 * row[7];
|
|
b3 -= W1 * row[7];
|
|
}
|
|
|
|
row[0] = (a0 + b0) >> ROW_SHIFT;
|
|
row[1] = (a1 + b1) >> ROW_SHIFT;
|
|
row[2] = (a2 + b2) >> ROW_SHIFT;
|
|
row[3] = (a3 + b3) >> ROW_SHIFT;
|
|
row[4] = (a3 - b3) >> ROW_SHIFT;
|
|
row[5] = (a2 - b2) >> ROW_SHIFT;
|
|
row[6] = (a1 - b1) >> ROW_SHIFT;
|
|
row[7] = (a0 - b0) >> ROW_SHIFT;
|
|
|
|
return 2;
|
|
}
|
|
#else /* not ARCH_ALPHA */
|
|
|
|
static inline void idctRowCondDC (int16_t * 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 ( ((((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 (!(((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;
|
|
}
|
|
#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;
|
|
}
|
|
#endif /* not ARCH_ALPHA */
|
|
|
|
static inline void idctSparseColPut (UINT8 *dest, int line_size,
|
|
int16_t * col)
|
|
{
|
|
int a0, a1, a2, a3, b0, b1, b2, b3;
|
|
UINT8 *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 *dest, int line_size,
|
|
int16_t * col)
|
|
{
|
|
int a0, a1, a2, a3, b0, b1, b2, b3;
|
|
UINT8 *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)];
|
|
}
|
|
|
|
#ifdef ARCH_ALPHA
|
|
/* If all rows but the first one are zero after row transformation,
|
|
all rows will be identical after column transformation. */
|
|
static inline void idctCol2(int16_t *col)
|
|
{
|
|
int i;
|
|
uint64_t l, r;
|
|
uint64_t *lcol = (uint64_t *) col;
|
|
|
|
for (i = 0; i < 8; ++i) {
|
|
int a0 = col[0] + (1 << (COL_SHIFT - 1)) / W4;
|
|
|
|
a0 *= W4;
|
|
col[0] = a0 >> COL_SHIFT;
|
|
++col;
|
|
}
|
|
|
|
l = lcol[0];
|
|
r = lcol[1];
|
|
lcol[ 2] = l; lcol[ 3] = r;
|
|
lcol[ 4] = l; lcol[ 5] = r;
|
|
lcol[ 6] = l; lcol[ 7] = r;
|
|
lcol[ 8] = l; lcol[ 9] = r;
|
|
lcol[10] = l; lcol[11] = r;
|
|
lcol[12] = l; lcol[13] = r;
|
|
lcol[14] = l; lcol[15] = r;
|
|
}
|
|
|
|
void simple_idct (short *block)
|
|
{
|
|
|
|
int i;
|
|
int rowsZero = 1; /* all rows except row 0 zero */
|
|
int rowsConstant = 1; /* all rows consist of a constant value */
|
|
|
|
for (i = 0; i < 8; i++) {
|
|
int sparseness = idctRowCondDC(block + 8 * i);
|
|
|
|
if (i > 0 && sparseness > 0)
|
|
rowsZero = 0;
|
|
if (sparseness == 2)
|
|
rowsConstant = 0;
|
|
}
|
|
|
|
if (rowsZero) {
|
|
idctCol2(block);
|
|
} else if (rowsConstant) {
|
|
uint64_t *lblock = (uint64_t *) block;
|
|
|
|
idctSparseCol(block);
|
|
for (i = 0; i < 8; i++) {
|
|
uint64_t v = (uint16_t) block[i * 8];
|
|
|
|
v += v << 16;
|
|
v += v << 32;
|
|
lblock[0] = v;
|
|
lblock[1] = v;
|
|
lblock += 2;
|
|
}
|
|
} else {
|
|
for (i = 0; i < 8; i++)
|
|
idctSparseCol(block + i);
|
|
}
|
|
}
|
|
|
|
/* XXX: suppress this mess */
|
|
void simple_idct_put(UINT8 *dest, int line_size, DCTELEM *block)
|
|
{
|
|
simple_idct(block);
|
|
put_pixels_clamped(block, dest, line_size);
|
|
}
|
|
|
|
void simple_idct_add(UINT8 *dest, int line_size, DCTELEM *block)
|
|
{
|
|
simple_idct(block);
|
|
add_pixels_clamped(block, dest, line_size);
|
|
}
|
|
|
|
#else
|
|
|
|
void simple_idct_put(UINT8 *dest, int line_size, INT16 *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 *dest, int line_size, INT16 *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);
|
|
}
|
|
|
|
#endif
|
|
|
|
#undef COL_SHIFT
|