diff --git a/libavcodec/mss1.c b/libavcodec/mss1.c
new file mode 100644
index 0000000..ba1a613
--- /dev/null
+++ b/libavcodec/mss1.c
@@ -0,0 +1,846 @@
+/*
+ * Microsoft Screen 1 (aka Windows Media Video V7 Screen) decoder
+ * Copyright (c) 2012 Konstantin Shishkov
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * Microsoft Screen 1 (aka Windows Media Video V7 Screen) decoder
+ */
+
+#include "libavutil/intfloat.h"
+#include "libavutil/intreadwrite.h"
+#include "avcodec.h"
+#include "get_bits.h"
+
+enum SplitMode {
+ SPLIT_VERT = 0,
+ SPLIT_HOR,
+ SPLIT_NONE
+};
+
+typedef struct ArithCoder {
+ int low, high, value;
+ GetBitContext *gb;
+} ArithCoder;
+
+#define MODEL_MIN_SYMS 2
+#define MODEL_MAX_SYMS 256
+#define THRESH_ADAPTIVE -1
+#define THRESH_LOW 15
+#define THRESH_HIGH 50
+#define THRESH_KOSTYA 1986
Nice easter egg ;P (aka unused define)
I didn't find anything objectionable in the rest of the patch, but I'm not
very familiar with this kind of code, so my review perhaps isn't the most
valuable one.
// Martin
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