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diff --git a/thirdparties/win32/include/g729b/oper_32b.h b/thirdparties/win32/include/g729b/oper_32b.h
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+/*
+ ITU-T G.729A Speech Coder ANSI-C Source Code
+ Version 1.1 Last modified: September 1996
+
+ Copyright (c) 1996,
+ AT&T, France Telecom, NTT, Universite de Sherbrooke, Lucent Technologies
+ All rights reserved.
+*/
+
+/* Double precision operations */
+
+void L_Extract(Word32 L_32, Word16 *hi, Word16 *lo);
+Word32 L_Comp(Word16 hi, Word16 lo);
+Word32 Mpy_32(Word16 hi1, Word16 lo1, Word16 hi2, Word16 lo2);
+Word32 Mpy_32_16(Word16 hi, Word16 lo, Word16 n);
+Word32 Div_32(Word32 L_num, Word16 denom_hi, Word16 denom_lo);
+
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