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-rw-r--r--src/libmpeg2/idct.c348
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diff --git a/src/libmpeg2/idct.c b/src/libmpeg2/idct.c
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-/*
- * idct.c
- * Copyright (C) 2000-2002 Michel Lespinasse <walken@zoy.org>
- * Copyright (C) 1999-2000 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.
- * See http://libmpeg2.sourceforge.net/ for updates.
- *
- * 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 <stdlib.h>
-#include <inttypes.h>
-
-#include "mpeg2_internal.h"
-#include "xineutils.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 points */
-void (* mpeg2_idct_copy) (int16_t * block, uint8_t * dest, int stride);
-void (* mpeg2_idct_add) (int16_t * block, uint8_t * dest, int stride);
-void (* mpeg2_idct) (int16_t * block);
-void (* mpeg2_zero_block) (int16_t * block);
-
-static uint8_t clip_lut[1024];
-#define CLIP(i) ((clip_lut+384)[ (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 void inline 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 void inline 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;
-}
-
-static void mpeg2_idct_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]);
-
- block[0] = 0; block[1] = 0; block[2] = 0; block[3] = 0;
- block[4] = 0; block[5] = 0; block[6] = 0; block[7] = 0;
-
- dest += stride;
- block += 8;
- } while (--i);
-}
-
-static void mpeg2_idct_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]);
-
- block[0] = 0; block[1] = 0; block[2] = 0; block[3] = 0;
- block[4] = 0; block[5] = 0; block[6] = 0; block[7] = 0;
-
- dest += stride;
- block += 8;
- } while (--i);
-}
-
-static void mpeg2_idct_c (int16_t * block)
-{
- int i;
-
- for (i = 0; i < 8; i++)
- idct_row (block + 8 * i);
-
- for (i = 0; i < 8; i++)
- idct_col (block + i);
-}
-
-static void mpeg2_zero_block_c (int16_t * wblock)
-{
- memset( wblock, 0, sizeof(int16_t) * 64 );
-}
-
-void mpeg2_idct_init (uint32_t mm_accel)
-{
- mpeg2_zero_block = mpeg2_zero_block_c;
-
-#if defined(ARCH_X86) || defined(ARCH_X86_64)
- if (mm_accel & MM_ACCEL_X86_MMXEXT) {
-#ifdef LOG
- fprintf (stderr, "Using MMXEXT for IDCT transform\n");
-#endif
- mpeg2_idct_copy = mpeg2_idct_copy_mmxext;
- mpeg2_idct_add = mpeg2_idct_add_mmxext;
- mpeg2_idct = mpeg2_idct_mmxext;
- mpeg2_zero_block = mpeg2_zero_block_mmx;
- mpeg2_idct_mmx_init ();
- } else if (mm_accel & MM_ACCEL_X86_MMX) {
-#ifdef LOG
- fprintf (stderr, "Using MMX for IDCT transform\n");
-#endif
- mpeg2_idct_copy = mpeg2_idct_copy_mmx;
- mpeg2_idct_add = mpeg2_idct_add_mmx;
- mpeg2_idct = mpeg2_idct_mmx;
- mpeg2_zero_block = mpeg2_zero_block_mmx;
- mpeg2_idct_mmx_init ();
- } else
-#endif
-#if defined (ARCH_PPC) && defined (ENABLE_ALTIVEC)
- if (mm_accel & MM_ACCEL_PPC_ALTIVEC) {
-#ifdef LOG
- fprintf (stderr, "Using altivec for IDCT transform\n");
-#endif
- mpeg2_idct_copy = mpeg2_idct_copy_altivec;
- mpeg2_idct_add = mpeg2_idct_add_altivec;
- mpeg2_idct_altivec_init ();
- mpeg2_idct = mpeg2_idct_c;
- } else
-#endif
-#ifdef LIBMPEG2_MLIB
- if (mm_accel & MM_ACCEL_MLIB) {
- char * env_var;
-
- env_var = getenv ("MLIB_NON_IEEE");
-
- mpeg2_idct = mpeg2_idct_mlib;
- if (env_var == NULL) {
-#ifdef LOG
- fprintf (stderr, "Using mlib for IDCT transform\n");
-#endif
- mpeg2_idct_add = mpeg2_idct_add_mlib;
- } else {
- fprintf (stderr, "Using non-IEEE mlib for IDCT transform\n");
- mpeg2_idct_add = mpeg2_idct_add_mlib_non_ieee;
- }
- mpeg2_idct_copy = mpeg2_idct_copy_mlib_non_ieee;
- } else
-#endif
- {
- int i;
-
-#ifdef LOG
- fprintf (stderr, "No accelerated IDCT transform found\n");
-#endif
- mpeg2_idct_copy = mpeg2_idct_copy_c;
- mpeg2_idct_add = mpeg2_idct_add_c;
- mpeg2_idct = mpeg2_idct_c;
- for (i = -384; i < 640; i++)
- clip_lut[i+384] = (i < 0) ? 0 : ((i > 255) ? 255 : i);
- }
-}
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