summaryrefslogtreecommitdiffstats
path: root/libmpeg2/idct_alpha.c
diff options
context:
space:
mode:
Diffstat (limited to 'libmpeg2/idct_alpha.c')
-rw-r--r--libmpeg2/idct_alpha.c380
1 files changed, 380 insertions, 0 deletions
diff --git a/libmpeg2/idct_alpha.c b/libmpeg2/idct_alpha.c
new file mode 100644
index 0000000000..fc29112592
--- /dev/null
+++ b/libmpeg2/idct_alpha.c
@@ -0,0 +1,380 @@
+/*
+ * idct_alpha.c
+ * Copyright (C) 2002 Falk Hueffner <falk@debian.org>
+ * Copyright (C) 2000-2002 Michel Lespinasse <walken@zoy.org>
+ * Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
+ *
+ * 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
+ */
+
+#include "config.h"
+
+#ifdef ARCH_ALPHA
+
+#include <stdlib.h>
+#include <inttypes.h>
+
+#include "alpha_asm.h"
+#include "attributes.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) */
+
+static uint8_t clip_lut[1024];
+#define CLIP(i) ((clip_lut+384)[(i)])
+
+#if 0
+#define BUTTERFLY(t0,t1,W0,W1,d0,d1) \
+do { \
+ t0 = W0*d0 + W1*d1; \
+ t1 = W0*d1 - W1*d0; \
+} while (0)
+#else
+#define BUTTERFLY(t0,t1,W0,W1,d0,d1) \
+do { \
+ int_fast32_t tmp = W0 * (d0 + d1); \
+ t0 = tmp + (W1 - W0) * d1; \
+ t1 = tmp - (W1 + W0) * d0; \
+} while (0)
+#endif
+
+static void inline idct_row (int16_t * const block)
+{
+ uint64_t l, r;
+ int_fast32_t d0, d1, d2, d3;
+ int_fast32_t a0, a1, a2, a3, b0, b1, b2, b3;
+ int_fast32_t t0, t1, t2, t3;
+
+ l = ldq (block);
+ r = ldq (block + 4);
+
+ /* shortcut */
+ if (likely (!((l & ~0xffffUL) | r))) {
+ uint64_t tmp = (uint16_t) (l << 3);
+ tmp |= tmp << 16;
+ tmp |= tmp << 32;
+ ((int32_t *)block)[0] = tmp;
+ ((int32_t *)block)[1] = tmp;
+ ((int32_t *)block)[2] = tmp;
+ ((int32_t *)block)[3] = tmp;
+ return;
+ }
+
+ d0 = (sextw (l) << 11) + 128;
+ d1 = sextw (extwl (l, 2));
+ d2 = sextw (extwl (l, 4)) << 11;
+ d3 = sextw (extwl (l, 6));
+ t0 = d0 + d2;
+ t1 = d0 - d2;
+ BUTTERFLY (t2, t3, W6, W2, d3, d1);
+ a0 = t0 + t2;
+ a1 = t1 + t3;
+ a2 = t1 - t3;
+ a3 = t0 - t2;
+
+ d0 = sextw (r);
+ d1 = sextw (extwl (r, 2));
+ d2 = sextw (extwl (r, 4));
+ d3 = sextw (extwl (r, 6));
+ BUTTERFLY (t0, t1, W7, W1, d3, d0);
+ BUTTERFLY (t2, t3, W3, W5, d1, d2);
+ b0 = t0 + t2;
+ b3 = t1 + t3;
+ t0 -= t2;
+ t1 -= t3;
+ b1 = ((t0 + t1) * 181) >> 8;
+ b2 = ((t0 - t1) * 181) >> 8;
+
+ block[0] = (a0 + b0) >> 8;
+ block[1] = (a1 + b1) >> 8;
+ block[2] = (a2 + b2) >> 8;
+ block[3] = (a3 + b3) >> 8;
+ block[4] = (a3 - b3) >> 8;
+ block[5] = (a2 - b2) >> 8;
+ block[6] = (a1 - b1) >> 8;
+ block[7] = (a0 - b0) >> 8;
+}
+
+static void inline idct_col (int16_t * const block)
+{
+ int_fast32_t d0, d1, d2, d3;
+ int_fast32_t a0, a1, a2, a3, b0, b1, b2, b3;
+ int_fast32_t t0, t1, t2, t3;
+
+ d0 = (block[8*0] << 11) + 65536;
+ d1 = block[8*1];
+ d2 = block[8*2] << 11;
+ d3 = block[8*3];
+ t0 = d0 + d2;
+ t1 = d0 - d2;
+ BUTTERFLY (t2, t3, W6, W2, d3, d1);
+ a0 = t0 + t2;
+ a1 = t1 + t3;
+ a2 = t1 - t3;
+ a3 = t0 - t2;
+
+ d0 = block[8*4];
+ d1 = block[8*5];
+ d2 = block[8*6];
+ d3 = block[8*7];
+ BUTTERFLY (t0, t1, W7, W1, d3, d0);
+ BUTTERFLY (t2, t3, W3, W5, d1, d2);
+ b0 = t0 + t2;
+ b3 = t1 + t3;
+ t0 = (t0 - t2) >> 8;
+ t1 = (t1 - t3) >> 8;
+ b1 = (t0 + t1) * 181;
+ b2 = (t0 - t1) * 181;
+
+ block[8*0] = (a0 + b0) >> 17;
+ block[8*1] = (a1 + b1) >> 17;
+ block[8*2] = (a2 + b2) >> 17;
+ block[8*3] = (a3 + b3) >> 17;
+ block[8*4] = (a3 - b3) >> 17;
+ block[8*5] = (a2 - b2) >> 17;
+ block[8*6] = (a1 - b1) >> 17;
+ block[8*7] = (a0 - b0) >> 17;
+}
+
+void mpeg2_idct_copy_mvi (int16_t * block, uint8_t * dest, const int stride)
+{
+ uint64_t clampmask;
+ int i;
+
+ for (i = 0; i < 8; i++)
+ idct_row (block + 8 * i);
+
+ for (i = 0; i < 8; i++)
+ idct_col (block + i);
+
+ clampmask = zap (-1, 0xaa); /* 0x00ff00ff00ff00ff */
+ do {
+ uint64_t shorts0, shorts1;
+
+ shorts0 = ldq (block);
+ shorts0 = maxsw4 (shorts0, 0);
+ shorts0 = minsw4 (shorts0, clampmask);
+ stl (pkwb (shorts0), dest);
+
+ shorts1 = ldq (block + 4);
+ shorts1 = maxsw4 (shorts1, 0);
+ shorts1 = minsw4 (shorts1, clampmask);
+ stl (pkwb (shorts1), dest + 4);
+
+ stq (0, block);
+ stq (0, block + 4);
+
+ dest += stride;
+ block += 8;
+ } while (--i);
+}
+
+void mpeg2_idct_add_mvi (const int last, int16_t * block,
+ uint8_t * dest, const int stride)
+{
+ uint64_t clampmask;
+ uint64_t signmask;
+ int i;
+
+ if (last != 129 || (block[0] & 7) == 4) {
+ for (i = 0; i < 8; i++)
+ idct_row (block + 8 * i);
+ for (i = 0; i < 8; i++)
+ idct_col (block + i);
+ clampmask = zap (-1, 0xaa); /* 0x00ff00ff00ff00ff */
+ signmask = zap (-1, 0x33);
+ signmask ^= signmask >> 1; /* 0x8000800080008000 */
+
+ do {
+ uint64_t shorts0, pix0, signs0;
+ uint64_t shorts1, pix1, signs1;
+
+ shorts0 = ldq (block);
+ shorts1 = ldq (block + 4);
+
+ pix0 = unpkbw (ldl (dest));
+ /* signed subword add (MMX paddw). */
+ signs0 = shorts0 & signmask;
+ shorts0 &= ~signmask;
+ shorts0 += pix0;
+ shorts0 ^= signs0;
+ /* clamp. */
+ shorts0 = maxsw4 (shorts0, 0);
+ shorts0 = minsw4 (shorts0, clampmask);
+
+ /* next 4. */
+ pix1 = unpkbw (ldl (dest + 4));
+ signs1 = shorts1 & signmask;
+ shorts1 &= ~signmask;
+ shorts1 += pix1;
+ shorts1 ^= signs1;
+ shorts1 = maxsw4 (shorts1, 0);
+ shorts1 = minsw4 (shorts1, clampmask);
+
+ stl (pkwb (shorts0), dest);
+ stl (pkwb (shorts1), dest + 4);
+ stq (0, block);
+ stq (0, block + 4);
+
+ dest += stride;
+ block += 8;
+ } while (--i);
+ } else {
+ int DC;
+ uint64_t p0, p1, p2, p3, p4, p5, p6, p7;
+ uint64_t DCs;
+
+ DC = (block[0] + 4) >> 3;
+ block[0] = block[63] = 0;
+
+ p0 = ldq (dest + 0 * stride);
+ p1 = ldq (dest + 1 * stride);
+ p2 = ldq (dest + 2 * stride);
+ p3 = ldq (dest + 3 * stride);
+ p4 = ldq (dest + 4 * stride);
+ p5 = ldq (dest + 5 * stride);
+ p6 = ldq (dest + 6 * stride);
+ p7 = ldq (dest + 7 * stride);
+
+ if (DC > 0) {
+ DCs = BYTE_VEC (likely (DC <= 255) ? DC : 255);
+ p0 += minub8 (DCs, ~p0);
+ p1 += minub8 (DCs, ~p1);
+ p2 += minub8 (DCs, ~p2);
+ p3 += minub8 (DCs, ~p3);
+ p4 += minub8 (DCs, ~p4);
+ p5 += minub8 (DCs, ~p5);
+ p6 += minub8 (DCs, ~p6);
+ p7 += minub8 (DCs, ~p7);
+ } else {
+ DCs = BYTE_VEC (likely (-DC <= 255) ? -DC : 255);
+ p0 -= minub8 (DCs, p0);
+ p1 -= minub8 (DCs, p1);
+ p2 -= minub8 (DCs, p2);
+ p3 -= minub8 (DCs, p3);
+ p4 -= minub8 (DCs, p4);
+ p5 -= minub8 (DCs, p5);
+ p6 -= minub8 (DCs, p6);
+ p7 -= minub8 (DCs, p7);
+ }
+
+ stq (p0, dest + 0 * stride);
+ stq (p1, dest + 1 * stride);
+ stq (p2, dest + 2 * stride);
+ stq (p3, dest + 3 * stride);
+ stq (p4, dest + 4 * stride);
+ stq (p5, dest + 5 * stride);
+ stq (p6, dest + 6 * stride);
+ stq (p7, dest + 7 * stride);
+ }
+}
+
+void mpeg2_idct_copy_alpha (int16_t * block, uint8_t * dest, const 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);
+ 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]);
+
+ stq(0, block);
+ stq(0, block + 4);
+
+ dest += stride;
+ block += 8;
+ } while (--i);
+}
+
+void mpeg2_idct_add_alpha (const int last, int16_t * block,
+ uint8_t * dest, const int stride)
+{
+ int i;
+
+ if (last != 129 || (block[0] & 7) == 4) {
+ for (i = 0; i < 8; i++)
+ idct_row (block + 8 * i);
+ for (i = 0; i < 8; i++)
+ idct_col (block + i);
+ 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]);
+
+ stq(0, block);
+ stq(0, block + 4);
+
+ dest += stride;
+ block += 8;
+ } while (--i);
+ } else {
+ int DC;
+
+ DC = (block[0] + 4) >> 3;
+ block[0] = block[63] = 0;
+ i = 8;
+ do {
+ dest[0] = CLIP (DC + dest[0]);
+ dest[1] = CLIP (DC + dest[1]);
+ dest[2] = CLIP (DC + dest[2]);
+ dest[3] = CLIP (DC + dest[3]);
+ dest[4] = CLIP (DC + dest[4]);
+ dest[5] = CLIP (DC + dest[5]);
+ dest[6] = CLIP (DC + dest[6]);
+ dest[7] = CLIP (DC + dest[7]);
+ dest += stride;
+ } while (--i);
+ }
+}
+
+void mpeg2_idct_alpha_init(int no_mvi)
+{
+ extern uint8_t mpeg2_scan_norm[64];
+ extern uint8_t mpeg2_scan_alt[64];
+ int i, j;
+
+ if (no_mvi)
+ for (i = -384; i < 640; i++)
+ clip_lut[i + 384] = (i < 0) ? 0 : ((i > 255) ? 255 : i);
+ for (i = 0; i < 64; i++) {
+ j = mpeg2_scan_norm[i];
+ mpeg2_scan_norm[i] = ((j & 0x36) >> 1) | ((j & 0x09) << 2);
+ j = mpeg2_scan_alt[i];
+ mpeg2_scan_alt[i] = ((j & 0x36) >> 1) | ((j & 0x09) << 2);
+ }
+}
+
+#endif /* ARCH_ALPHA */
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-05 06:35:21 +0000