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-rw-r--r--apps/plugins/mpegplayer/libmpeg2/idct.c274
1 files changed, 274 insertions, 0 deletions
diff --git a/apps/plugins/mpegplayer/libmpeg2/idct.c b/apps/plugins/mpegplayer/libmpeg2/idct.c
new file mode 100644
index 0000000000..7f0b9a3c12
--- /dev/null
+++ b/apps/plugins/mpegplayer/libmpeg2/idct.c
@@ -0,0 +1,274 @@
+/*
+ * 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
+ *
+ * $Id$
+ * libmpeg2 sync history:
+ * 2008-07-01 - CVS revision 1.36
+ */
+
+#include "plugin.h"
+
+#include "mpeg2dec_config.h"
+
+#include "mpeg2.h"
+#include "attributes.h"
+#include "mpeg2_internal.h"
+
+#if defined(CPU_COLDFIRE) || defined (CPU_ARM)
+#define IDCT_ASM
+#endif
+
+#ifndef IDCT_ASM
+
+#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) */
+
+/*
+ * 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.
+ */
+#define CLIP(i) \
+ ({ typeof (i) _i = (i); \
+ if ((_i & 0xff) != _i) \
+ _i = ~(_i >> (8*sizeof(_i) - 1)); \
+ _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;
+}
+
+void mpeg2_idct_copy (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);
+}
+
+void mpeg2_idct_add (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 = (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);
+ }
+}
+
+#endif /* IDCT_ASM */
+
+void mpeg2_idct_init (void)
+{
+ int i, j;
+
+ for (i = 0; i < 64; i++)
+ {
+ j = default_mpeg2_scan_norm[i];
+ mpeg2_scan_norm[i] = ((j & 0x36) >> 1) | ((j & 0x09) << 2);
+
+ j = default_mpeg2_scan_alt[i];
+ mpeg2_scan_alt[i] = ((j & 0x36) >> 1) | ((j & 0x09) << 2);
+ }
+}