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diff --git a/contrib/ffmpeg/libavcodec/rv34data.h b/contrib/ffmpeg/libavcodec/rv34data.h
new file mode 100644
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+++ b/contrib/ffmpeg/libavcodec/rv34data.h
@@ -0,0 +1,148 @@
+/*
+ * RealVideo 4 decoder
+ * copyright (c) 2007 Konstantin Shishkov
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg 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.
+ *
+ * FFmpeg 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 FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file rv34data.h
+ * miscellaneous RV30/40 tables
+ */
+
+#ifndef FFMPEG_RV34DATA_H
+#define FFMPEG_RV34DATA_H
+
+#include <stdint.h>
+
+/**
+ * number of ones in nibble minus one
+ */
+static const uint8_t rv34_count_ones[16] = {
+    0, 0, 0, 1, 0, 1, 1, 2, 0, 1, 1, 2, 1, 2, 2, 3
+};
+
+/**
+ * values used to reconstruct coded block pattern
+ */
+static const uint8_t rv34_cbp_code[16] = {
+    0x00, 0x20, 0x10, 0x30, 0x02, 0x22, 0x12, 0x32,
+    0x01, 0x21, 0x11, 0x31, 0x03, 0x23, 0x13, 0x33
+};
+
+/**
+ * precalculated results of division by three and modulo three for values 0-107
+ *
+ * A lot of four-tuples in RV40 are represented as c0*27+c1*9+c2*3+c3.
+ * This table allows conversion from a value back to a vector.
+ */
+static const uint8_t modulo_three_table[108][4] = {
+ { 0, 0, 0, 0 }, { 0, 0, 0, 1 }, { 0, 0, 0, 2 }, { 0, 0, 1, 0 },
+ { 0, 0, 1, 1 }, { 0, 0, 1, 2 }, { 0, 0, 2, 0 }, { 0, 0, 2, 1 },
+ { 0, 0, 2, 2 }, { 0, 1, 0, 0 }, { 0, 1, 0, 1 }, { 0, 1, 0, 2 },
+ { 0, 1, 1, 0 }, { 0, 1, 1, 1 }, { 0, 1, 1, 2 }, { 0, 1, 2, 0 },
+ { 0, 1, 2, 1 }, { 0, 1, 2, 2 }, { 0, 2, 0, 0 }, { 0, 2, 0, 1 },
+ { 0, 2, 0, 2 }, { 0, 2, 1, 0 }, { 0, 2, 1, 1 }, { 0, 2, 1, 2 },
+ { 0, 2, 2, 0 }, { 0, 2, 2, 1 }, { 0, 2, 2, 2 }, { 1, 0, 0, 0 },
+ { 1, 0, 0, 1 }, { 1, 0, 0, 2 }, { 1, 0, 1, 0 }, { 1, 0, 1, 1 },
+ { 1, 0, 1, 2 }, { 1, 0, 2, 0 }, { 1, 0, 2, 1 }, { 1, 0, 2, 2 },
+ { 1, 1, 0, 0 }, { 1, 1, 0, 1 }, { 1, 1, 0, 2 }, { 1, 1, 1, 0 },
+ { 1, 1, 1, 1 }, { 1, 1, 1, 2 }, { 1, 1, 2, 0 }, { 1, 1, 2, 1 },
+ { 1, 1, 2, 2 }, { 1, 2, 0, 0 }, { 1, 2, 0, 1 }, { 1, 2, 0, 2 },
+ { 1, 2, 1, 0 }, { 1, 2, 1, 1 }, { 1, 2, 1, 2 }, { 1, 2, 2, 0 },
+ { 1, 2, 2, 1 }, { 1, 2, 2, 2 }, { 2, 0, 0, 0 }, { 2, 0, 0, 1 },
+ { 2, 0, 0, 2 }, { 2, 0, 1, 0 }, { 2, 0, 1, 1 }, { 2, 0, 1, 2 },
+ { 2, 0, 2, 0 }, { 2, 0, 2, 1 }, { 2, 0, 2, 2 }, { 2, 1, 0, 0 },
+ { 2, 1, 0, 1 }, { 2, 1, 0, 2 }, { 2, 1, 1, 0 }, { 2, 1, 1, 1 },
+ { 2, 1, 1, 2 }, { 2, 1, 2, 0 }, { 2, 1, 2, 1 }, { 2, 1, 2, 2 },
+ { 2, 2, 0, 0 }, { 2, 2, 0, 1 }, { 2, 2, 0, 2 }, { 2, 2, 1, 0 },
+ { 2, 2, 1, 1 }, { 2, 2, 1, 2 }, { 2, 2, 2, 0 }, { 2, 2, 2, 1 },
+ { 2, 2, 2, 2 }, { 3, 0, 0, 0 }, { 3, 0, 0, 1 }, { 3, 0, 0, 2 },
+ { 3, 0, 1, 0 }, { 3, 0, 1, 1 }, { 3, 0, 1, 2 }, { 3, 0, 2, 0 },
+ { 3, 0, 2, 1 }, { 3, 0, 2, 2 }, { 3, 1, 0, 0 }, { 3, 1, 0, 1 },
+ { 3, 1, 0, 2 }, { 3, 1, 1, 0 }, { 3, 1, 1, 1 }, { 3, 1, 1, 2 },
+ { 3, 1, 2, 0 }, { 3, 1, 2, 1 }, { 3, 1, 2, 2 }, { 3, 2, 0, 0 },
+ { 3, 2, 0, 1 }, { 3, 2, 0, 2 }, { 3, 2, 1, 0 }, { 3, 2, 1, 1 },
+ { 3, 2, 1, 2 }, { 3, 2, 2, 0 }, { 3, 2, 2, 1 }, { 3, 2, 2, 2 },
+};
+
+/**
+ * quantizer values used for AC and DC coefficients in chroma blocks
+ */
+static const uint8_t rv34_chroma_quant[2][32] = {
+ {  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15,
+   16, 17, 17, 18, 19, 20, 20, 21, 22, 22, 23, 23, 24, 24, 25, 25 },
+ {  0,  0,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13,
+   14, 15, 15, 16, 17, 18, 18, 19, 20, 20, 21, 21, 22, 22, 23, 23 }
+};
+
+/**
+ * This table is used for dequantizing.
+ */
+static const uint16_t rv34_qscale_tab[32] = {
+  60,   67,   76,   85,   96,  108,  121,  136,
+ 152,  171,  192,  216,  242,  272,  305,  341,
+ 383,  432,  481,  544,  606,  683,  767,  854,
+ 963, 1074, 1212, 1392, 1566, 1708, 1978, 2211
+};
+
+/**
+ * 4x4 dezigzag pattern
+ */
+static const uint8_t rv34_dezigzag[16] = {
+  0,  1,  8, 16,
+  9,  2,  3, 10,
+ 17, 24, 25, 18,
+ 11, 19, 26, 27
+};
+
+/**
+ * tables used to translate a quantizer value into a VLC set for decoding
+ * The first table is used for intraframes.
+ */
+static const uint8_t rv34_quant_to_vlc_set[2][31] = {
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1,
+   2, 2, 2, 2, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3,
+   3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6 },
+};
+
+/**
+ * table for obtaining the quantizer difference
+ * @todo Use with modified_quant_tab from h263data.h.
+ */
+static const uint8_t rv34_dquant_tab[2][32]={
+//  0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
+{
+    0, 3, 1, 2, 3, 4, 5, 6, 7, 8, 9, 9,10,11,12,13,14,15,16,17,18,18,19,20,21,22,23,24,25,26,27,28
+},{
+    0, 2, 3, 4, 5, 6, 7, 8, 9,10,11,13,14,15,16,17,18,19,20,21,22,24,25,26,27,28,29,30,31,31,31,26
+}
+};
+
+/**
+ * maximum number of macroblocks for each of the possible slice offset sizes
+ * @todo This is the same as ff_mba_max, maybe use it instead.
+ */
+static const uint16_t rv34_mb_max_sizes[6] = { 0x2F, 0x68, 0x18B, 0x62F, 0x18BF, 0x23FF };
+/**
+ * bits needed to code the slice offset for the given size
+ * @todo This is the same as ff_mba_length, maybe use it instead.
+ */
+static const uint8_t rv34_mb_bits_sizes[6] = { 6, 7, 9, 11, 13, 14 };
+
+#endif /* FFMPEG_RV34DATA_H */