1 files changed, 157 insertions, 0 deletions
diff --git a/media/libav/libavcodec/fft.h b/media/libav/libavcodec/fft.h
new file mode 100644
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+++ b/media/libav/libavcodec/fft.h
@@ -0,0 +1,157 @@
+/*
+ * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
+ * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVCODEC_FFT_H
+#define AVCODEC_FFT_H
+
+#ifndef FFT_FLOAT
+#define FFT_FLOAT 1
+#endif
+
+#include <stdint.h>
+#include "config.h"
+#include "libavutil/mem.h"
+
+#if FFT_FLOAT
+
+#include "avfft.h"
+
+#define FFT_NAME(x) x
+
+typedef float FFTDouble;
+
+#else
+
+#define FFT_NAME(x) x ## _fixed
+
+typedef int16_t FFTSample;
+typedef int     FFTDouble;
+
+typedef struct FFTComplex {
+    int16_t re, im;
+} FFTComplex;
+
+typedef struct FFTContext FFTContext;
+
+#endif /* FFT_FLOAT */
+
+typedef struct FFTDComplex {
+    FFTDouble re, im;
+} FFTDComplex;
+
+/* FFT computation */
+
+enum fft_permutation_type {
+    FF_FFT_PERM_DEFAULT,
+    FF_FFT_PERM_SWAP_LSBS,
+    FF_FFT_PERM_AVX,
+};
+
+enum mdct_permutation_type {
+    FF_MDCT_PERM_NONE,
+    FF_MDCT_PERM_INTERLEAVE,
+};
+
+struct FFTContext {
+    int nbits;
+    int inverse;
+    uint16_t *revtab;
+    FFTComplex *tmp_buf;
+    int mdct_size; /* size of MDCT (i.e. number of input data * 2) */
+    int mdct_bits; /* n = 2^nbits */
+    /* pre/post rotation tables */
+    FFTSample *tcos;
+    FFTSample *tsin;
+    /**
+     * Do the permutation needed BEFORE calling fft_calc().
+     */
+    void (*fft_permute)(struct FFTContext *s, FFTComplex *z);
+    /**
+     * Do a complex FFT with the parameters defined in ff_fft_init(). The
+     * input data must be permuted before. No 1.0/sqrt(n) normalization is done.
+     */
+    void (*fft_calc)(struct FFTContext *s, FFTComplex *z);
+    void (*imdct_calc)(struct FFTContext *s, FFTSample *output, const FFTSample *input);
+    void (*imdct_half)(struct FFTContext *s, FFTSample *output, const FFTSample *input);
+    void (*mdct_calc)(struct FFTContext *s, FFTSample *output, const FFTSample *input);
+    void (*mdct_calcw)(struct FFTContext *s, FFTDouble *output, const FFTSample *input);
+    enum fft_permutation_type fft_permutation;
+    enum mdct_permutation_type mdct_permutation;
+};
+
+#if CONFIG_HARDCODED_TABLES
+#define COSTABLE_CONST const
+#else
+#define COSTABLE_CONST
+#endif
+
+#define COSTABLE(size) \
+    COSTABLE_CONST DECLARE_ALIGNED(32, FFTSample, FFT_NAME(ff_cos_##size))[size/2]
+
+extern COSTABLE(16);
+extern COSTABLE(32);
+extern COSTABLE(64);
+extern COSTABLE(128);
+extern COSTABLE(256);
+extern COSTABLE(512);
+extern COSTABLE(1024);
+extern COSTABLE(2048);
+extern COSTABLE(4096);
+extern COSTABLE(8192);
+extern COSTABLE(16384);
+extern COSTABLE(32768);
+extern COSTABLE(65536);
+extern COSTABLE_CONST FFTSample* const FFT_NAME(ff_cos_tabs)[17];
+
+#define ff_init_ff_cos_tabs FFT_NAME(ff_init_ff_cos_tabs)
+
+/**
+ * Initialize the cosine table in ff_cos_tabs[index]
+ * @param index index in ff_cos_tabs array of the table to initialize
+ */
+void ff_init_ff_cos_tabs(int index);
+
+#define ff_fft_init FFT_NAME(ff_fft_init)
+#define ff_fft_end  FFT_NAME(ff_fft_end)
+
+/**
+ * Set up a complex FFT.
+ * @param nbits           log2 of the length of the input array
+ * @param inverse         if 0 perform the forward transform, if 1 perform the inverse
+ */
+int ff_fft_init(FFTContext *s, int nbits, int inverse);
+
+void ff_fft_init_aarch64(FFTContext *s);
+void ff_fft_init_x86(FFTContext *s);
+void ff_fft_init_arm(FFTContext *s);
+void ff_fft_init_ppc(FFTContext *s);
+
+void ff_fft_fixed_init_arm(FFTContext *s);
+
+void ff_fft_end(FFTContext *s);
+
+#define ff_mdct_init FFT_NAME(ff_mdct_init)
+#define ff_mdct_end  FFT_NAME(ff_mdct_end)
+
+int ff_mdct_init(FFTContext *s, int nbits, int inverse, double scale);
+void ff_mdct_end(FFTContext *s);
+
+#endif /* AVCODEC_FFT_H */