1 files changed, 287 insertions, 0 deletions

diff --git a/apps/plugins/mpegplayer/idct.c b/apps/plugins/mpegplayer/idct.c
new file mode 100644
index 0000000000..8a0b56ea22
--- /dev/null
+++ b/apps/plugins/mpegplayer/idct.c
@@ -0,0 +1,287 @@
+/*
+ * idct.c
+ * Copyright (C) 2000-2003 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 "plugin.h"
+
+#include "mpeg2dec_config.h"
+
+#include "mpeg2.h"
+#include "attributes.h"
+#include "mpeg2_internal.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 (* mpeg2_idct_copy) (int16_t * block, uint8_t * dest, int stride);
+void (* mpeg2_idct_add) (int last, int16_t * block,
+                         uint8_t * dest, int stride);
+
+/*
+ * In legal streams, the IDCT output should be between -384 and +384.
+ * In corrupted streams, it is possible to force the IDCT output to go
+ * to +-3826 - this is the worst case for a column IDCT where the
+ * column inputs are 16-bit values.
+ */
+uint8_t mpeg2_clip[3840 * 2 + 256] IBSS_ATTR;
+#define CLIP(i) ((mpeg2_clip + 3840)[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 tmp = W0 * (d0 + d1);                \
+    t0 = tmp + (W1 - W0) * d1;                \
+    t1 = tmp - (W1 + W0) * d0;                \
+} while (0)
+#endif
+
+static inline void idct_row (int16_t * const block)
+{
+    int d0, d1, d2, d3;
+    int a0, a1, a2, a3, b0, b1, b2, b3;
+    int t0, t1, t2, t3;
+
+    /* shortcut */
+    if (likely (!(block[1] | ((int32_t *)block)[1] | ((int32_t *)block)[2] |
+                  ((int32_t *)block)[3]))) {
+        uint32_t tmp = (uint16_t) (block[0] >> 1);
+        tmp |= tmp << 16;
+        ((int32_t *)block)[0] = tmp;
+        ((int32_t *)block)[1] = tmp;
+        ((int32_t *)block)[2] = tmp;
+        ((int32_t *)block)[3] = tmp;
+        return;
+    }
+
+    d0 = (block[0] << 11) + 2048;
+    d1 = block[1];
+    d2 = block[2] << 11;
+    d3 = block[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[4];
+    d1 = block[5];
+    d2 = block[6];
+    d3 = block[7];
+    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) >> 8) * 181;
+    b2 = ((t0 - t1) >> 8) * 181;
+
+    block[0] = (a0 + b0) >> 12;
+    block[1] = (a1 + b1) >> 12;
+    block[2] = (a2 + b2) >> 12;
+    block[3] = (a3 + b3) >> 12;
+    block[4] = (a3 - b3) >> 12;
+    block[5] = (a2 - b2) >> 12;
+    block[6] = (a1 - b1) >> 12;
+    block[7] = (a0 - b0) >> 12;
+}
+
+static inline void idct_col (int16_t * const block)
+{
+    int d0, d1, d2, d3;
+    int a0, a1, a2, a3, b0, b1, b2, b3;
+    int 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 -= t2;
+    t1 -= t3;
+    b1 = ((t0 + t1) >> 8) * 181;
+    b2 = ((t0 - t1) >> 8) * 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;
+}
+
+static void mpeg2_idct_copy_c (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]);
+
+        ((int32_t *)block)[0] = 0;        ((int32_t *)block)[1] = 0;
+        ((int32_t *)block)[2] = 0;        ((int32_t *)block)[3] = 0;
+
+        dest += stride;
+        block += 8;
+    } while (--i);
+}
+
+static void mpeg2_idct_add_c (const int last, int16_t * block,
+                              uint8_t * dest, const int stride)
+{
+    int i;
+
+    if (last != 129 || (block[0] & (7 << 4)) == (4 << 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]);
+
+            ((int32_t *)block)[0] = 0;        ((int32_t *)block)[1] = 0;
+            ((int32_t *)block)[2] = 0;        ((int32_t *)block)[3] = 0;
+
+            dest += stride;
+            block += 8;
+        } while (--i);
+    } else {
+        int DC;
+
+        DC = (block[0] + 64) >> 7;
+        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_init (uint32_t accel)
+{
+    (void)accel;
+#ifdef ARCH_X86
+    if (accel & MPEG2_ACCEL_X86_MMXEXT) {
+        mpeg2_idct_copy = mpeg2_idct_copy_mmxext;
+        mpeg2_idct_add = mpeg2_idct_add_mmxext;
+        mpeg2_idct_mmx_init ();
+    } else if (accel & MPEG2_ACCEL_X86_MMX) {
+        mpeg2_idct_copy = mpeg2_idct_copy_mmx;
+        mpeg2_idct_add = mpeg2_idct_add_mmx;
+        mpeg2_idct_mmx_init ();
+    } else
+#endif
+#ifdef ARCH_PPC
+    if (accel & MPEG2_ACCEL_PPC_ALTIVEC) {
+        mpeg2_idct_copy = mpeg2_idct_copy_altivec;
+        mpeg2_idct_add = mpeg2_idct_add_altivec;
+        mpeg2_idct_altivec_init ();
+    } else
+#endif
+#ifdef ARCH_ALPHA
+    if (accel & MPEG2_ACCEL_ALPHA_MVI) {
+        mpeg2_idct_copy = mpeg2_idct_copy_mvi;
+        mpeg2_idct_add = mpeg2_idct_add_mvi;
+        mpeg2_idct_alpha_init ();
+    } else if (accel & MPEG2_ACCEL_ALPHA) {
+        int i;
+
+        mpeg2_idct_copy = mpeg2_idct_copy_alpha;
+        mpeg2_idct_add = mpeg2_idct_add_alpha;
+        mpeg2_idct_alpha_init ();
+        for (i = -3840; i < 3840 + 256; i++)
+            CLIP(i) = (i < 0) ? 0 : ((i > 255) ? 255 : i);
+    } else
+#endif
+    {
+        extern uint8_t mpeg2_scan_norm[64];
+        extern uint8_t mpeg2_scan_alt[64];
+        int i, j;
+
+        mpeg2_idct_copy = mpeg2_idct_copy_c;
+        mpeg2_idct_add = mpeg2_idct_add_c;
+        for (i = -3840; i < 3840 + 256; i++)
+            CLIP(i) = (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);
+        }
+    }
+}