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287 lines
7.7 KiB
287 lines
7.7 KiB
/*
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* idct.c
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* Copyright (C) 2000-2003 Michel Lespinasse <walken@zoy.org>
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* Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
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*
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* This file is part of mpeg2dec, a free MPEG-2 video stream decoder.
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* See http://libmpeg2.sourceforge.net/ for updates.
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*
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* mpeg2dec is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* mpeg2dec 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "config.h"
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#include "k9common.h"
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#include <stdlib.h>
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#include "mpeg2.h"
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#include "attributes.h"
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#include "mpeg2_internal.h"
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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 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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/* idct main entry point */
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void (* mpeg2_idct_copy) (int16_t * block, uint8_t * dest, int stride);
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void (* mpeg2_idct_add) (int last, int16_t * block,
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uint8_t * dest, int stride);
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/*
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* In legal streams, the IDCT output should be between -384 and +384.
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* In corrupted streams, it is possible to force the IDCT output to go
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* to +-3826 - this is the worst case for a column IDCT where the
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* column inputs are 16-bit values.
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*/
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uint8_t mpeg2_clip[3840 * 2 + 256];
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#define CLIP(i) ((mpeg2_clip + 3840)[i])
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#if 0
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#define BUTTERFLY(t0,t1,W0,W1,d0,d1) \
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do { \
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t0 = W0 * d0 + W1 * d1; \
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t1 = W0 * d1 - W1 * d0; \
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} while (0)
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#else
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#define BUTTERFLY(t0,t1,W0,W1,d0,d1) \
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do { \
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int tmp = W0 * (d0 + d1); \
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t0 = tmp + (W1 - W0) * d1; \
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t1 = tmp - (W1 + W0) * d0; \
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} while (0)
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#endif
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static void inline idct_row (int16_t * const block)
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{
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int d0, d1, d2, d3;
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int a0, a1, a2, a3, b0, b1, b2, b3;
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int t0, t1, t2, t3;
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/* shortcut */
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if (likely (!(block[1] | ((int32_t *)block)[1] | ((int32_t *)block)[2] |
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((int32_t *)block)[3]))) {
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uint32_t tmp = (uint16_t) (block[0] >> 1);
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tmp |= tmp << 16;
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((int32_t *)block)[0] = tmp;
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((int32_t *)block)[1] = tmp;
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((int32_t *)block)[2] = tmp;
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((int32_t *)block)[3] = tmp;
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return;
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}
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d0 = (block[0] << 11) + 2048;
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d1 = block[1];
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d2 = block[2] << 11;
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d3 = block[3];
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t0 = d0 + d2;
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t1 = d0 - d2;
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BUTTERFLY (t2, t3, W6, W2, d3, d1);
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a0 = t0 + t2;
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a1 = t1 + t3;
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a2 = t1 - t3;
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a3 = t0 - t2;
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d0 = block[4];
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d1 = block[5];
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d2 = block[6];
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d3 = block[7];
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BUTTERFLY (t0, t1, W7, W1, d3, d0);
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BUTTERFLY (t2, t3, W3, W5, d1, d2);
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b0 = t0 + t2;
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b3 = t1 + t3;
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t0 -= t2;
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t1 -= t3;
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b1 = ((t0 + t1) >> 8) * 181;
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b2 = ((t0 - t1) >> 8) * 181;
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block[0] = (a0 + b0) >> 12;
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block[1] = (a1 + b1) >> 12;
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block[2] = (a2 + b2) >> 12;
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block[3] = (a3 + b3) >> 12;
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block[4] = (a3 - b3) >> 12;
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block[5] = (a2 - b2) >> 12;
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block[6] = (a1 - b1) >> 12;
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block[7] = (a0 - b0) >> 12;
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}
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static void inline idct_col (int16_t * const block)
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{
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int d0, d1, d2, d3;
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int a0, a1, a2, a3, b0, b1, b2, b3;
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int t0, t1, t2, t3;
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d0 = (block[8*0] << 11) + 65536;
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d1 = block[8*1];
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d2 = block[8*2] << 11;
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d3 = block[8*3];
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t0 = d0 + d2;
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t1 = d0 - d2;
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BUTTERFLY (t2, t3, W6, W2, d3, d1);
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a0 = t0 + t2;
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a1 = t1 + t3;
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a2 = t1 - t3;
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a3 = t0 - t2;
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d0 = block[8*4];
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d1 = block[8*5];
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d2 = block[8*6];
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d3 = block[8*7];
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BUTTERFLY (t0, t1, W7, W1, d3, d0);
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BUTTERFLY (t2, t3, W3, W5, d1, d2);
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b0 = t0 + t2;
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b3 = t1 + t3;
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t0 -= t2;
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t1 -= t3;
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b1 = ((t0 + t1) >> 8) * 181;
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b2 = ((t0 - t1) >> 8) * 181;
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block[8*0] = (a0 + b0) >> 17;
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block[8*1] = (a1 + b1) >> 17;
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block[8*2] = (a2 + b2) >> 17;
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block[8*3] = (a3 + b3) >> 17;
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block[8*4] = (a3 - b3) >> 17;
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block[8*5] = (a2 - b2) >> 17;
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block[8*6] = (a1 - b1) >> 17;
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block[8*7] = (a0 - b0) >> 17;
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}
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static void mpeg2_idct_copy_c (int16_t * block, uint8_t * dest,
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const int stride)
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{
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int i;
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for (i = 0; i < 8; i++)
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idct_row (block + 8 * i);
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for (i = 0; i < 8; i++)
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idct_col (block + i);
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do {
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dest[0] = CLIP (block[0]);
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dest[1] = CLIP (block[1]);
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dest[2] = CLIP (block[2]);
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dest[3] = CLIP (block[3]);
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dest[4] = CLIP (block[4]);
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dest[5] = CLIP (block[5]);
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dest[6] = CLIP (block[6]);
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dest[7] = CLIP (block[7]);
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((int32_t *)block)[0] = 0; ((int32_t *)block)[1] = 0;
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((int32_t *)block)[2] = 0; ((int32_t *)block)[3] = 0;
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dest += stride;
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block += 8;
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} while (--i);
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}
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static void mpeg2_idct_add_c (const int last, int16_t * block,
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uint8_t * dest, const int stride)
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{
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int i;
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if (last != 129 || (block[0] & (7 << 4)) == (4 << 4)) {
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for (i = 0; i < 8; i++)
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idct_row (block + 8 * i);
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for (i = 0; i < 8; i++)
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idct_col (block + i);
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do {
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dest[0] = CLIP (block[0] + dest[0]);
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dest[1] = CLIP (block[1] + dest[1]);
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dest[2] = CLIP (block[2] + dest[2]);
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dest[3] = CLIP (block[3] + dest[3]);
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dest[4] = CLIP (block[4] + dest[4]);
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dest[5] = CLIP (block[5] + dest[5]);
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dest[6] = CLIP (block[6] + dest[6]);
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dest[7] = CLIP (block[7] + dest[7]);
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((int32_t *)block)[0] = 0; ((int32_t *)block)[1] = 0;
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((int32_t *)block)[2] = 0; ((int32_t *)block)[3] = 0;
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dest += stride;
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block += 8;
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} while (--i);
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} else {
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int DC;
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DC = (block[0] + 64) >> 7;
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block[0] = block[63] = 0;
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i = 8;
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do {
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dest[0] = CLIP (DC + dest[0]);
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dest[1] = CLIP (DC + dest[1]);
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dest[2] = CLIP (DC + dest[2]);
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dest[3] = CLIP (DC + dest[3]);
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dest[4] = CLIP (DC + dest[4]);
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dest[5] = CLIP (DC + dest[5]);
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dest[6] = CLIP (DC + dest[6]);
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dest[7] = CLIP (DC + dest[7]);
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dest += stride;
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} while (--i);
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}
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}
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void mpeg2_idct_init (uint32_t accel)
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{
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#ifdef ARCH_X86
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if (accel & MPEG2_ACCEL_X86_MMXEXT) {
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mpeg2_idct_copy = mpeg2_idct_copy_mmxext;
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mpeg2_idct_add = mpeg2_idct_add_mmxext;
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mpeg2_idct_mmx_init ();
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} else if (accel & MPEG2_ACCEL_X86_MMX) {
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mpeg2_idct_copy = mpeg2_idct_copy_mmx;
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mpeg2_idct_add = mpeg2_idct_add_mmx;
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mpeg2_idct_mmx_init ();
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} else
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#endif
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#ifdef ARCH_PPC
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if (accel & MPEG2_ACCEL_PPC_ALTIVEC) {
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mpeg2_idct_copy = mpeg2_idct_copy_altivec;
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mpeg2_idct_add = mpeg2_idct_add_altivec;
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mpeg2_idct_altivec_init ();
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} else
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#endif
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#ifdef ARCH_ALPHA
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if (accel & MPEG2_ACCEL_ALPHA_MVI) {
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mpeg2_idct_copy = mpeg2_idct_copy_mvi;
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mpeg2_idct_add = mpeg2_idct_add_mvi;
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mpeg2_idct_alpha_init ();
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} else if (accel & MPEG2_ACCEL_ALPHA) {
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int i;
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mpeg2_idct_copy = mpeg2_idct_copy_alpha;
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mpeg2_idct_add = mpeg2_idct_add_alpha;
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mpeg2_idct_alpha_init ();
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for (i = -3840; i < 3840 + 256; i++)
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CLIP(i) = (i < 0) ? 0 : ((i > 255) ? 255 : i);
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} else
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#endif
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{
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extern uint8_t mpeg2_scan_norm[64];
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extern uint8_t mpeg2_scan_alt[64];
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int i, j;
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mpeg2_idct_copy = mpeg2_idct_copy_c;
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mpeg2_idct_add = mpeg2_idct_add_c;
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for (i = -3840; i < 3840 + 256; i++)
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CLIP(i) = (i < 0) ? 0 : ((i > 255) ? 255 : i);
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for (i = 0; i < 64; i++) {
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j = mpeg2_scan_norm[i];
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mpeg2_scan_norm[i] = ((j & 0x36) >> 1) | ((j & 0x09) << 2);
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j = mpeg2_scan_alt[i];
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mpeg2_scan_alt[i] = ((j & 0x36) >> 1) | ((j & 0x09) << 2);
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}
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}
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}
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