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diff --git a/contrib/libmpcdec/mpcdec/internal.h b/contrib/libmpcdec/mpcdec/internal.h
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+++ b/contrib/libmpcdec/mpcdec/internal.h
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+/*
+  Copyright (c) 2005, The Musepack Development Team
+  All rights reserved.
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions are
+  met:
+
+  * Redistributions of source code must retain the above copyright
+  notice, this list of conditions and the following disclaimer.
+
+  * Redistributions in binary form must reproduce the above
+  copyright notice, this list of conditions and the following
+  disclaimer in the documentation and/or other materials provided
+  with the distribution.
+
+  * Neither the name of the The Musepack Development Team nor the
+  names of its contributors may be used to endorse or promote
+  products derived from this software without specific prior
+  written permission.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+/// \file internal.h
+/// Definitions and structures used only internally by the libmpcdec.
+
+#ifndef _mpcdec_internal_h
+#define _mpcdec_internal_h
+
+
+enum {
+    MPC_DECODER_SYNTH_DELAY = 481
+};
+
+/// Big/little endian 32 bit byte swapping routine.
+static __inline
+mpc_uint32_t mpc_swap32(mpc_uint32_t val) {
+    return (((val & 0xff000000) >> 24) | ((val & 0x00ff0000) >> 8) |
+            ((val & 0x0000ff00) <<  8) | ((val & 0x000000ff) << 24));
+}
+
+/// Searches for a ID3v2-tag and reads the length (in bytes) of it.
+/// \param reader supplying raw stream data
+/// \return size of tag, in bytes
+/// \return -1 on errors of any kind
+mpc_int32_t JumpID3v2(mpc_reader* fp);
+
+/// helper functions used by multiple files
+mpc_uint32_t mpc_random_int(mpc_decoder *d); // in synth_filter.c
+void mpc_decoder_initialisiere_quantisierungstabellen(mpc_decoder *d, double scale_factor);
+void mpc_decoder_synthese_filter_float(mpc_decoder *d, MPC_SAMPLE_FORMAT* OutData);
+
+#endif // _mpcdec_internal_h
+