1 files changed, 84 insertions, 0 deletions
diff --git a/kopete/protocols/msn/webcam/libmimic/vlc_encode.c b/kopete/protocols/msn/webcam/libmimic/vlc_encode.c
new file mode 100644
index 00000000..8d301627
--- /dev/null
+++ b/kopete/protocols/msn/webcam/libmimic/vlc_encode.c
@@ -0,0 +1,84 @@
+/* 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 "mimic-private.h"
+
+extern guchar _col_zag[64];
+extern VlcSymbol _vlc_alphabet[16][128];
+
+/*
+ * _vlc_encode_block
+ *
+ * Serialize an 8x8 block using variable length coding.
+ */
+void _vlc_encode_block(MimCtx *ctx, const gint *block, gint num_coeffs)
+{
+    gint i, num_zeroes;
+
+    /* The DC value is written out as is. */
+    _write_bits(ctx, block[0], 8);
+
+    /* Number of zeroes prefixing the next non-zero value. */
+    num_zeroes = 0;
+
+    for (i = 1; i < num_coeffs && num_zeroes <= 14; i++) {
+
+        /* Fetch AC coefficients from block in zig-zag order. */
+        gint value = block[_col_zag[i]];
+
+        if (value != 0) {
+            VlcSymbol sym;
+
+            /* Clip input values to [-128, +128]. */
+            if (value < -128)
+                value = -128;
+            else if (value > 128)
+                value = 128;
+
+            /* Look up symbol for the current non-zero value. */
+            sym = _vlc_alphabet[num_zeroes][abs(value) - 1];
+
+            /* No symbol? very rare... */
+            if (sym.length1 <= 0)
+                break;
+
+            /* The symbols for negative values are the same as for positives, minus one. */
+            if (value < 0) {
+                if (sym.length2 > 0)
+                    sym.part2 -= 1;
+                else
+                    sym.part1 -= 1;
+            }
+
+            /* Write out the full symbol. */
+            _write_bits(ctx, sym.part1, sym.length1);
+            if (sym.length2 > 0)
+                _write_bits(ctx, sym.part2, sym.length2);
+
+            /* Start counting zeroes again. */
+            num_zeroes = 0;
+        } else {
+            num_zeroes++;
+        }
+    }
+
+    /* Write out EOB if necessary. */
+    if (num_zeroes > 0)
+        _write_bits(ctx, 0xA, 4);
+}
+