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diff --git a/src/opus-1.1/celt/mdct.h b/src/opus-1.1/celt/mdct.h
deleted file mode 100644
index d7218213..00000000
--- a/src/opus-1.1/celt/mdct.h
+++ /dev/null
@@ -1,70 +0,0 @@
-/* Copyright (c) 2007-2008 CSIRO
-   Copyright (c) 2007-2008 Xiph.Org Foundation
-   Written by Jean-Marc Valin */
-/*
-   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.
-
-   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.
-*/
-
-/* This is a simple MDCT implementation that uses a N/4 complex FFT
-   to do most of the work. It should be relatively straightforward to
-   plug in pretty much and FFT here.
-
-   This replaces the Vorbis FFT (and uses the exact same API), which
-   was a bit too messy and that was ending up duplicating code
-   (might as well use the same FFT everywhere).
-
-   The algorithm is similar to (and inspired from) Fabrice Bellard's
-   MDCT implementation in FFMPEG, but has differences in signs, ordering
-   and scaling in many places.
-*/
-
-#ifndef MDCT_H
-#define MDCT_H
-
-#include "opus_defines.h"
-#include "kiss_fft.h"
-#include "arch.h"
-
-typedef struct {
-   int n;
-   int maxshift;
-   const kiss_fft_state *kfft[4];
-   const kiss_twiddle_scalar * OPUS_RESTRICT trig;
-} mdct_lookup;
-
-int clt_mdct_init(mdct_lookup *l,int N, int maxshift);
-void clt_mdct_clear(mdct_lookup *l);
-
-/** Compute a forward MDCT and scale by 4/N, trashes the input array */
-void clt_mdct_forward(const mdct_lookup *l, kiss_fft_scalar *in,
-      kiss_fft_scalar * OPUS_RESTRICT out,
-      const opus_val16 *window, int overlap, int shift, int stride);
-
-/** Compute a backward MDCT (no scaling) and performs weighted overlap-add
-    (scales implicitly by 1/2) */
-void clt_mdct_backward(const mdct_lookup *l, kiss_fft_scalar *in,
-      kiss_fft_scalar * OPUS_RESTRICT out,
-      const opus_val16 * OPUS_RESTRICT window, int overlap, int shift, int stride);
-
-#endif