mirror of
https://github.com/mpv-player/mpv
synced 2024-11-18 21:16:10 +01:00
8e368a8571
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@3732 b3059339-0415-0410-9bf9-f77b7e298cf2
289 lines
7.3 KiB
C
289 lines
7.3 KiB
C
/*
|
|
* idct.c
|
|
* Copyright (C) 1999-2001 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
|
|
*
|
|
* Portions of this code are from the MPEG software simulation group
|
|
* idct implementation. This code will be replaced with a new
|
|
* implementation soon.
|
|
*
|
|
* This file is part of mpeg2dec, a free MPEG-2 video stream decoder.
|
|
*
|
|
* mpeg2dec is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* mpeg2dec 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 General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
/**********************************************************/
|
|
/* inverse two dimensional DCT, Chen-Wang algorithm */
|
|
/* (cf. IEEE ASSP-32, pp. 803-816, Aug. 1984) */
|
|
/* 32-bit integer arithmetic (8 bit coefficients) */
|
|
/* 11 mults, 29 adds per DCT */
|
|
/* sE, 18.8.91 */
|
|
/**********************************************************/
|
|
/* coefficients extended to 12 bit for IEEE1180-1990 */
|
|
/* compliance sE, 2.1.94 */
|
|
/**********************************************************/
|
|
|
|
/* this code assumes >> to be a two's-complement arithmetic */
|
|
/* right shift: (-2)>>1 == -1 , (-3)>>1 == -2 */
|
|
|
|
#include "config.h"
|
|
|
|
#include <stdio.h>
|
|
#include <inttypes.h>
|
|
|
|
#include "mpeg2_internal.h"
|
|
#include "mm_accel.h"
|
|
|
|
#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 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) */
|
|
|
|
/* idct main entry point */
|
|
void (*idct_block_copy) (int16_t * block, uint8_t * dest, int stride);
|
|
void (*idct_block_add) (int16_t * block, uint8_t * dest, int stride);
|
|
|
|
static void idct_block_copy_c (int16_t *block, uint8_t * dest, int stride);
|
|
static void idct_block_add_c (int16_t *block, uint8_t * dest, int stride);
|
|
|
|
static uint8_t clip_lut[1024];
|
|
#define CLIP(i) ((clip_lut+384)[ (i)])
|
|
|
|
void idct_init (void)
|
|
{
|
|
#ifdef ARCH_X86
|
|
if (config.flags & MM_ACCEL_X86_MMXEXT) {
|
|
printf ("libmpeg2: Using MMXEXT for IDCT transform\n");
|
|
idct_block_copy = idct_block_copy_mmxext;
|
|
idct_block_add = idct_block_add_mmxext;
|
|
idct_mmx_init ();
|
|
} else if (config.flags & MM_ACCEL_X86_MMX) {
|
|
printf ("libmpeg2: Using MMX for IDCT transform\n");
|
|
idct_block_copy = idct_block_copy_mmx;
|
|
idct_block_add = idct_block_add_mmx;
|
|
idct_mmx_init ();
|
|
} else
|
|
#endif
|
|
#ifdef LIBMPEG2_MLIB
|
|
if (config.flags & MM_ACCEL_MLIB) {
|
|
printf ("libmpeg2: Using mlib for IDCT transform\n");
|
|
idct_block_copy = idct_block_copy_mlib;
|
|
idct_block_add = idct_block_add_mlib;
|
|
} else
|
|
#endif
|
|
{
|
|
int i;
|
|
|
|
printf ("libmpeg2: No accelerated IDCT transform found\n");
|
|
idct_block_copy = idct_block_copy_c;
|
|
idct_block_add = idct_block_add_c;
|
|
for (i = -384; i < 640; i++)
|
|
clip_lut[i+384] = (i < 0) ? 0 : ((i > 255) ? 255 : i);
|
|
}
|
|
}
|
|
|
|
/* row (horizontal) IDCT
|
|
*
|
|
* 7 pi 1
|
|
* dst[k] = sum c[l] * src[l] * cos ( -- * ( k + - ) * l )
|
|
* l=0 8 2
|
|
*
|
|
* where: c[0] = 128
|
|
* c[1..7] = 128*sqrt (2)
|
|
*/
|
|
|
|
static inline void idct_row (int16_t * block)
|
|
{
|
|
int x0, x1, x2, x3, x4, x5, x6, x7, x8;
|
|
|
|
x1 = block[4] << 11;
|
|
x2 = block[6];
|
|
x3 = block[2];
|
|
x4 = block[1];
|
|
x5 = block[7];
|
|
x6 = block[5];
|
|
x7 = block[3];
|
|
|
|
/* shortcut */
|
|
if (! (x1 | x2 | x3 | x4 | x5 | x6 | x7 )) {
|
|
block[0] = block[1] = block[2] = block[3] = block[4] =
|
|
block[5] = block[6] = block[7] = block[0]<<3;
|
|
return;
|
|
}
|
|
|
|
x0 = (block[0] << 11) + 128; /* for proper rounding in the fourth stage */
|
|
|
|
/* first stage */
|
|
x8 = W7 * (x4 + x5);
|
|
x4 = x8 + (W1 - W7) * x4;
|
|
x5 = x8 - (W1 + W7) * x5;
|
|
x8 = W3 * (x6 + x7);
|
|
x6 = x8 - (W3 - W5) * x6;
|
|
x7 = x8 - (W3 + W5) * x7;
|
|
|
|
/* second stage */
|
|
x8 = x0 + x1;
|
|
x0 -= x1;
|
|
x1 = W6 * (x3 + x2);
|
|
x2 = x1 - (W2 + W6) * x2;
|
|
x3 = x1 + (W2 - W6) * x3;
|
|
x1 = x4 + x6;
|
|
x4 -= x6;
|
|
x6 = x5 + x7;
|
|
x5 -= x7;
|
|
|
|
/* third stage */
|
|
x7 = x8 + x3;
|
|
x8 -= x3;
|
|
x3 = x0 + x2;
|
|
x0 -= x2;
|
|
x2 = (181 * (x4 + x5) + 128) >> 8;
|
|
x4 = (181 * (x4 - x5) + 128) >> 8;
|
|
|
|
/* fourth stage */
|
|
block[0] = (x7 + x1) >> 8;
|
|
block[1] = (x3 + x2) >> 8;
|
|
block[2] = (x0 + x4) >> 8;
|
|
block[3] = (x8 + x6) >> 8;
|
|
block[4] = (x8 - x6) >> 8;
|
|
block[5] = (x0 - x4) >> 8;
|
|
block[6] = (x3 - x2) >> 8;
|
|
block[7] = (x7 - x1) >> 8;
|
|
}
|
|
|
|
/* column (vertical) IDCT
|
|
*
|
|
* 7 pi 1
|
|
* dst[8*k] = sum c[l] * src[8*l] * cos ( -- * ( k + - ) * l )
|
|
* l=0 8 2
|
|
*
|
|
* where: c[0] = 1/1024
|
|
* c[1..7] = (1/1024)*sqrt (2)
|
|
*/
|
|
|
|
static inline void idct_col (int16_t *block)
|
|
{
|
|
int x0, x1, x2, x3, x4, x5, x6, x7, x8;
|
|
|
|
/* shortcut */
|
|
x1 = block [8*4] << 8;
|
|
x2 = block [8*6];
|
|
x3 = block [8*2];
|
|
x4 = block [8*1];
|
|
x5 = block [8*7];
|
|
x6 = block [8*5];
|
|
x7 = block [8*3];
|
|
|
|
#if 0
|
|
if (! (x1 | x2 | x3 | x4 | x5 | x6 | x7 )) {
|
|
block[8*0] = block[8*1] = block[8*2] = block[8*3] = block[8*4] =
|
|
block[8*5] = block[8*6] = block[8*7] = (block[8*0] + 32) >> 6;
|
|
return;
|
|
}
|
|
#endif
|
|
|
|
x0 = (block[8*0] << 8) + 8192;
|
|
|
|
/* first stage */
|
|
x8 = W7 * (x4 + x5) + 4;
|
|
x4 = (x8 + (W1 - W7) * x4) >> 3;
|
|
x5 = (x8 - (W1 + W7) * x5) >> 3;
|
|
x8 = W3 * (x6 + x7) + 4;
|
|
x6 = (x8 - (W3 - W5) * x6) >> 3;
|
|
x7 = (x8 - (W3 + W5) * x7) >> 3;
|
|
|
|
/* second stage */
|
|
x8 = x0 + x1;
|
|
x0 -= x1;
|
|
x1 = W6 * (x3 + x2) + 4;
|
|
x2 = (x1 - (W2 + W6) * x2) >> 3;
|
|
x3 = (x1 + (W2 - W6) * x3) >> 3;
|
|
x1 = x4 + x6;
|
|
x4 -= x6;
|
|
x6 = x5 + x7;
|
|
x5 -= x7;
|
|
|
|
/* third stage */
|
|
x7 = x8 + x3;
|
|
x8 -= x3;
|
|
x3 = x0 + x2;
|
|
x0 -= x2;
|
|
x2 = (181 * (x4 + x5) + 128) >> 8;
|
|
x4 = (181 * (x4 - x5) + 128) >> 8;
|
|
|
|
/* fourth stage */
|
|
block[8*0] = (x7 + x1) >> 14;
|
|
block[8*1] = (x3 + x2) >> 14;
|
|
block[8*2] = (x0 + x4) >> 14;
|
|
block[8*3] = (x8 + x6) >> 14;
|
|
block[8*4] = (x8 - x6) >> 14;
|
|
block[8*5] = (x0 - x4) >> 14;
|
|
block[8*6] = (x3 - x2) >> 14;
|
|
block[8*7] = (x7 - x1) >> 14;
|
|
}
|
|
|
|
void idct_block_copy_c (int16_t * block, uint8_t * dest, int stride)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < 8; i++)
|
|
idct_row (block + 8 * i);
|
|
|
|
for (i = 0; i < 8; i++)
|
|
idct_col (block + i);
|
|
|
|
i = 8;
|
|
do {
|
|
dest[0] = CLIP (block[0]);
|
|
dest[1] = CLIP (block[1]);
|
|
dest[2] = CLIP (block[2]);
|
|
dest[3] = CLIP (block[3]);
|
|
dest[4] = CLIP (block[4]);
|
|
dest[5] = CLIP (block[5]);
|
|
dest[6] = CLIP (block[6]);
|
|
dest[7] = CLIP (block[7]);
|
|
|
|
dest += stride;
|
|
block += 8;
|
|
} while (--i);
|
|
}
|
|
|
|
void idct_block_add_c (int16_t * block, uint8_t * dest, int stride)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < 8; i++)
|
|
idct_row (block + 8 * i);
|
|
|
|
for (i = 0; i < 8; i++)
|
|
idct_col (block + i);
|
|
|
|
i = 8;
|
|
do {
|
|
dest[0] = CLIP (block[0] + dest[0]);
|
|
dest[1] = CLIP (block[1] + dest[1]);
|
|
dest[2] = CLIP (block[2] + dest[2]);
|
|
dest[3] = CLIP (block[3] + dest[3]);
|
|
dest[4] = CLIP (block[4] + dest[4]);
|
|
dest[5] = CLIP (block[5] + dest[5]);
|
|
dest[6] = CLIP (block[6] + dest[6]);
|
|
dest[7] = CLIP (block[7] + dest[7]);
|
|
|
|
dest += stride;
|
|
block += 8;
|
|
} while (--i);
|
|
}
|