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Diffstat (limited to 'kopete/protocols/msn/webcam/libmimic/deblock.c')
-rw-r--r--kopete/protocols/msn/webcam/libmimic/deblock.c450
1 files changed, 450 insertions, 0 deletions
diff --git a/kopete/protocols/msn/webcam/libmimic/deblock.c b/kopete/protocols/msn/webcam/libmimic/deblock.c
new file mode 100644
index 00000000..cfd6ff6d
--- /dev/null
+++ b/kopete/protocols/msn/webcam/libmimic/deblock.c
@@ -0,0 +1,450 @@
+/* Copyright (C) 2005 Ole André Vadla Ravnås <oleavr@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include "mimic-private.h"
+
+static void deblock_horizontal(guchar *blocks, guint stride, guint row_count);
+static void deblock_vertical(guchar *blocks, guint stride, guint row_count);
+
+static gboolean deblock_h_consider_entire(guchar *blocks, guint stride);
+static void deblock_h_do_entire(guchar *blocks, guint stride);
+static void deblock_h_do_boundaries(guchar *blocks, guint stride);
+
+static gboolean deblock_v_consider_entire(guchar *blocks, guint stride);
+static void deblock_v_do_entire(guchar *blocks, guint stride);
+static void deblock_v_do_boundaries(guchar *blocks, guint stride);
+
+/*
+ * _deblock
+ *
+ * Internal helper-function used for de-blocking.
+ */
+void _deblock(guchar *blocks, guint stride, guint row_count)
+{
+ deblock_horizontal(blocks, stride, row_count);
+ deblock_vertical(blocks, stride, row_count);
+}
+
+static void deblock_horizontal(guchar *blocks, guint stride, guint row_count)
+{
+ guchar *p1;
+ gint i, j, n1, n2;
+
+ if (stride <= 8 || row_count == 0)
+ return;
+
+ p1 = blocks + 4;
+ n1 = ((row_count - 1) >> 2) + 1;
+ n2 = ((stride - 9) >> 3) + 1;
+
+ for (i = 0; i < n1; i++) {
+ guchar *p;
+
+ p = p1;
+
+ for (j = 0; j < n2; j++) {
+
+ if (deblock_h_consider_entire(p - 1, stride) == TRUE) {
+
+ gint v1, v2, v;
+
+ v1 = p[0];
+ v2 = p[7];
+
+ v = v1 - v2;
+ if (v <= 0)
+ v = v2 - v1;
+
+ if (v < 20)
+ deblock_h_do_entire(p - 1, stride);
+
+ } else {
+ deblock_h_do_boundaries(p - 1, stride);
+ }
+
+ p += 8;
+ }
+
+ p1 += stride * 4;
+ }
+}
+
+static void deblock_vertical(guchar *blocks, guint stride, guint row_count)
+{
+ gint i, j, k, n1, n2;
+ guchar *p1, *p2;
+
+ if (stride == 0 || row_count <= 8)
+ return;
+
+ p1 = blocks + (stride * 3);
+ p2 = blocks + (stride * 4);
+
+ n1 = ((row_count - 9) >> 3) + 1;
+ n2 = ((stride - 1) >> 3) + 1;
+
+ for (i = 0; i < n1; i++) {
+ guchar *p3, *p4;
+
+ p3 = p1;
+ p4 = p2;
+
+ for (j = 0; j < n2; j++) {
+
+ if (deblock_v_consider_entire(p3, stride) == TRUE) {
+ guchar *p5;
+ gboolean do_entire;
+
+ p5 = p3 + (stride * 8);
+ do_entire = TRUE;
+
+ for (k = 0; k < 8; k++) {
+ gint v1, v2, v;
+
+ v1 = p4[k];
+ v2 = p5[k];
+
+ v = v1 - v2;
+ if (v <= 0)
+ v = v2 - v1;
+
+ if (v > 20) {
+ do_entire = FALSE;
+ break;
+ }
+ }
+
+ if (do_entire)
+ deblock_v_do_entire(p3, stride);
+ } else {
+ deblock_v_do_boundaries(p3, stride);
+ }
+
+ p3 += 8;
+ p4 += 8;
+ }
+
+ p1 += stride * 8;
+ p2 += stride * 8;
+ }
+}
+
+static gboolean deblock_h_consider_entire(guchar *blocks, guint stride)
+{
+ guchar *p;
+ gint i, j, count;
+
+ count = 0;
+ p = blocks;
+
+ for (i = 0; i < 4; i++) {
+
+ for (j = 1; j <= 7; j++) {
+ gint v1, v2, v;
+
+ v1 = p[j];
+ v2 = p[j+1];
+
+ v = v1 - v2;
+ if (v <= 0)
+ v = v2 - v1;
+
+ if (v <= 1)
+ count--;
+ }
+
+ p += stride;
+ }
+
+ return (count <= -20);
+}
+
+static void deblock_h_do_entire(guchar *blocks, guint stride)
+{
+ guchar buf[8], *p;
+ gint i;
+
+ p = blocks;
+
+ for (i = 0; i < 4; i++) {
+ gint v, low, high;
+
+ v = p[0] - p[1];
+ if (v <= 0)
+ v = p[1] - p[0];
+
+ if (v < 10)
+ low = p[0];
+ else
+ low = p[1];
+
+ v = p[8] - p[9];
+ if (v <= 0)
+ v = p[9] - p[8];
+
+ if (v >= 10)
+ high = p[8];
+ else
+ high = p[9];
+
+ v = (low * 3) + p[1] + p[2] + p[3] + p[4] + 4;
+ buf[0] = (((p[1] + v) << 1) - p[4] + p[5]) >> 4;
+
+ v += p[5] - low;
+ buf[1] = (((p[2] + v) << 1) - p[5] + p[6]) >> 4;
+
+ v += p[6] - low;
+ buf[2] = (((p[3] + v) << 1) - p[6] + p[7]) >> 4;
+
+ v += p[7] - low;
+ buf[3] = (((p[4] + v) << 1) - p[1] - p[7] + p[8] + low) >> 4;
+
+ v += p[8] - p[1];
+ buf[4] = (((p[5] + v) << 1) + p[1] - p[2] - p[8] + high) >> 4;
+
+ v += high - p[2];
+ buf[5] = (((p[6] + v) << 1) + p[2] - p[3]) >> 4;
+
+ v += high - p[3];
+ buf[6] = (((p[7] + v) << 1) + p[3] - p[4]) >> 4;
+
+ v += high;
+ buf[7] = (((p[8] + v) << 1) - p[4] - p[5]) >> 4;
+
+ memcpy(p + 1, buf, 8);
+
+ p += stride;
+ }
+}
+
+static void deblock_h_do_boundaries(guchar *blocks, guint stride)
+{
+ guchar *p;
+ gint i;
+
+ p = blocks;
+
+ for (i = 0; i < 4; i++) {
+ gint v, v1, v2, v3;
+
+ v = p[4] - p[5];
+
+ if ((v / 2) != 0) {
+
+ v1 = ((p[3] - p[6]) * 2) - (v * 5);
+
+ if (abs(v1) < 80) {
+
+ v2 = ((p[3] - p[2]) * 5) + ((p[1] - p[4]) * 2);
+ v3 = (p[5] * 2) + (p[7] * 5) - (p[8] * 7);
+
+ v = abs(v1) - MIN(abs(v2), abs(v3));
+
+ if (v > 0) {
+
+ v = ((v * 5) + 32) >> 6;
+ if (v > 0) {
+
+ v2 = (p[4] - p[5]) / 2;
+ v3 = (((v1 < 0) * 2) - 1) * v;
+
+ if (v2 > 0)
+ v = MIN(v2, ((v3 < 0) - 1) & v3);
+ else
+ v = MAX(v2, ((v3 > 0) - 1) & v3);
+
+ p[4] -= v;
+ p[5] += v;
+ }
+ }
+ }
+ }
+
+ p += stride;
+ }
+}
+
+static gboolean deblock_v_consider_entire(guchar *blocks, guint stride)
+{
+ gint count, i, j;
+ guchar *p1, *p2;
+
+ count = 0;
+
+ p1 = blocks + stride;
+ p2 = blocks + (stride * 2);
+
+ for (i = 0; i < 7; i++) {
+
+ for (j = 0; j < 8; j++) {
+ gint v1, v2, v;
+
+ v1 = p1[j];
+ v2 = p2[j];
+
+ v = v1 - v2;
+ if (v <= 0)
+ v = v2 - v1;
+
+ if (v <= 1)
+ count++;
+ }
+
+ p1 += stride;
+ p2 += stride;
+ }
+
+ return (count > 40);
+}
+
+static void deblock_v_do_entire(guchar *blocks, guint stride)
+{
+ gint offset0, offset1, offset2, offset3;
+ gint offset4, offset5, offset6, offset7;
+ gint offset8, i;
+ guchar *p, buf[8];
+
+ offset0 = stride - (stride * 6);
+ offset1 = (stride * 2) - (stride * 6);
+ offset2 = (stride * 3) - (stride * 6);
+ offset3 = (stride * 4) - (stride * 6);
+ offset4 = (stride * 5) - (stride * 6);
+ offset5 = 0;
+ offset6 = (stride * 7) - (stride * 6);
+ offset7 = (stride * 8) - (stride * 6);
+ offset8 = (stride * 9) - (stride * 6);
+
+ p = blocks + (stride * 6);
+
+ for (i = 0; i < 8; i++) {
+ gint v, low, high;
+
+ v = blocks[i] - p[offset0];
+ if (v <= 0)
+ v = p[offset0] - blocks[i];
+
+ if (v < 10)
+ low = blocks[i];
+ else
+ low = p[offset0];
+
+ v = p[offset7] - p[offset8];
+ if (v <= 0)
+ v = p[offset8] - p[offset7];
+
+ if (v < 10)
+ high = p[offset8];
+ else
+ high = p[offset7];
+
+ v = p[offset0] + (low * 3) + p[offset1] + p[offset2] + p[offset3] + 4;
+
+ buf[0] = (((p[offset0] + v) << 1) - p[offset3] + p[offset4]) >> 4;
+
+ v += p[offset4] - low;
+
+ buf[1] = (((p[offset1] + v) << 1) - p[offset4] + p[0]) >> 4;
+
+ v += p[0] - low;
+
+ buf[2] = (((p[offset2] + v) << 1) - p[0] + p[offset6]) >> 4;
+
+ v += p[offset6] - low;
+
+ buf[3] = (((p[offset3] + v) << 1) - p[offset0] - p[offset6] + p[offset7] + low) >> 4;
+
+ v += p[offset7] - p[offset0];
+
+ buf[4] = (((p[offset4] + v) << 1) - p[offset7] - p[offset1] + p[offset0] + high) >> 4;
+
+ v += high - p[offset1];
+
+ buf[5] = (((p[0] + v) << 1) - p[offset2] + p[offset1]) >> 4;
+
+ v += high - p[offset2];
+
+ buf[6] = (((p[offset6] + v) << 1) - p[offset3] + p[offset2]) >> 4;
+
+ v += high;
+
+ buf[7] = (((p[offset7] + v) << 1) - p[offset4] - p[offset3]) >> 4;
+
+ p[offset0] = buf[0];
+ p[offset1] = buf[1];
+ p[offset2] = buf[2];
+ p[offset3] = buf[3];
+ p[offset4] = buf[4];
+ p[offset5] = buf[5];
+ p[offset6] = buf[6];
+ p[offset7] = buf[7];
+
+ p++;
+ }
+}
+
+static void deblock_v_do_boundaries(guchar *blocks, guint stride)
+{
+ guchar *p;
+ gint offset0, offset1, offset2, offset3;
+ gint offset4, offset5, offset6, offset7;
+ gint i;
+
+ p = blocks + (stride * 3);
+
+ offset0 = stride - (stride * 3);
+ offset1 = (stride * 2) - (stride * 3);
+ offset2 = 0;
+ offset3 = (stride * 4) - (stride * 3);
+ offset4 = (stride * 5) - (stride * 3);
+ offset5 = (stride * 6) - (stride * 3);
+ offset6 = (stride * 7) - (stride * 3);
+ offset7 = (stride * 8) - (stride * 3);
+
+ for (i = 0; i < 8; i++) {
+ gint v1, v2, v3, v;
+
+ v1 = ((p[offset4] - p[offset3]) * 5) + ((p[offset2] - p[offset5]) * 2);
+
+ if (abs(v1) < 80) {
+
+ v2 = ((p[offset2] - p[offset1]) * 5) + ((p[offset0] - p[offset3]) * 2);
+ v3 = ((p[offset6] - p[offset5]) * 5) + ((p[offset4] - p[offset7]) * 2);
+
+ v = abs(v1) - MIN(abs(v2), abs(v3));
+ if (v < 0)
+ v = 0;
+
+ v2 = (p[offset3] - p[offset4]) / 2;
+ v3 = (((v * 5) + 32) >> 6) * (((v1 < 0) * 2) - 1);
+
+ if (v2 > 0)
+ v = MIN(v2, ((v3 < 0) - 1) & v3);
+ else
+ v = MAX(v2, ((v3 > 0) - 1) & v3);
+ } else {
+ v = 0;
+ }
+
+ p[offset3] -= v;
+ p[offset4] += v;
+
+ p++;
+ }
+}
+
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