1 files changed, 62 insertions, 0 deletions
diff --git a/libavcodec/mdct15.h b/libavcodec/mdct15.h
new file mode 100644
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--- /dev/null
+++ b/libavcodec/mdct15.h
@@ -0,0 +1,62 @@
+/*
+ * Copyright (c) 2017 Rostislav Pehlivanov <atomnuker@gmail.com>
+ *
+ * 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
+ */
+
+#ifndef AVCODEC_MDCT15_H
+#define AVCODEC_MDCT15_H
+
+#include <stddef.h>
+
+#include "fft.h"
+
+typedef struct MDCT15Context {
+    int fft_n;
+    int len2;
+    int len4;
+    int inverse;
+    int *pfa_prereindex;
+    int *pfa_postreindex;
+
+    FFTContext ptwo_fft;
+    FFTComplex *tmp;
+    FFTComplex *twiddle_exptab;
+
+    DECLARE_ALIGNED(32, FFTComplex, exptab)[64];
+
+    /* 15-point FFT */
+    void (*fft15)(FFTComplex *out, FFTComplex *in, FFTComplex *exptab, ptrdiff_t stride);
+
+    /* PFA postrotate and exptab */
+    void (*postreindex)(FFTComplex *out, FFTComplex *in, FFTComplex *exp, int *lut, ptrdiff_t len8);
+
+    /* Calculate a full 2N -> N MDCT */
+    void (*mdct)(struct MDCT15Context *s, float *dst, const float *src, ptrdiff_t stride);
+
+    /* Calculate the middle half of the iMDCT */
+    void (*imdct_half)(struct MDCT15Context *s, float *dst, const float *src,
+                       ptrdiff_t stride);
+} MDCT15Context;
+
+/* Init an (i)MDCT of the length 2 * 15 * (2^N) */
+int ff_mdct15_init(MDCT15Context **ps, int inverse, int N, double scale);
+void ff_mdct15_uninit(MDCT15Context **ps);
+
+void ff_mdct15_init_x86(MDCT15Context *s);
+
+#endif /* AVCODEC_MDCT15_H */