ARM: NEON fixed-point FFT

Signed-off-by: Mans Rullgard <mans@mansr.com>

libavcodec/arm/fft_fixed_init_arm.c

@@ -0,0 +1,32 @@
+/*
+ * Copyright (c) 2009 Mans Rullgard <mans@mansr.com>
+ *
+ * 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
+ */
+
+#define CONFIG_FFT_FLOAT 0
+#include "libavcodec/fft.h"
+
+void ff_fft_fixed_calc_neon(FFTContext *s, FFTComplex *z);
+
+av_cold void ff_fft_fixed_init_arm(FFTContext *s)
+{
+    if (HAVE_NEON) {
+        s->fft_permutation = FF_FFT_PERM_SWAP_LSBS;
+        s->fft_calc        = ff_fft_fixed_calc_neon;
+    }
+}