From 4538729afed44a0ee0a762d3ef69aa4bbb7f10b3 Mon Sep 17 00:00:00 2001 From: Mans Rullgard Date: Sat, 19 Mar 2011 23:44:00 +0000 Subject: Move sine windows to a separate file These windows do not really belong in fft/mdct files and were easily confused with the similarly named tables used by rdft. Signed-off-by: Mans Rullgard --- libavcodec/sinewin_tablegen.h | 60 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 60 insertions(+) create mode 100644 libavcodec/sinewin_tablegen.h (limited to 'libavcodec/sinewin_tablegen.h') diff --git a/libavcodec/sinewin_tablegen.h b/libavcodec/sinewin_tablegen.h new file mode 100644 index 0000000000..91c26c1551 --- /dev/null +++ b/libavcodec/sinewin_tablegen.h @@ -0,0 +1,60 @@ +/* + * Header file for hardcoded sine windows + * + * Copyright (c) 2009 Reimar Döffinger + * + * 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 + */ + +#include +// do not use libavutil/libm.h since this is compiled both +// for the host and the target and config.h is only valid for the target +#include +#include "libavutil/attributes.h" + +#if !CONFIG_HARDCODED_TABLES +SINETABLE( 32); +SINETABLE( 64); +SINETABLE( 128); +SINETABLE( 256); +SINETABLE( 512); +SINETABLE(1024); +SINETABLE(2048); +SINETABLE(4096); +#else +#include "libavcodec/sinewin_tables.h" +#endif + +SINETABLE_CONST float * const ff_sine_windows[] = { + NULL, NULL, NULL, NULL, NULL, // unused + ff_sine_32 , ff_sine_64 , + ff_sine_128, ff_sine_256, ff_sine_512, ff_sine_1024, ff_sine_2048, ff_sine_4096 +}; + +// Generate a sine window. +av_cold void ff_sine_window_init(float *window, int n) { + int i; + for(i = 0; i < n; i++) + window[i] = sinf((i + 0.5) * (M_PI / (2.0 * n))); +} + +av_cold void ff_init_ff_sine_windows(int index) { + assert(index >= 0 && index < FF_ARRAY_ELEMS(ff_sine_windows)); +#if !CONFIG_HARDCODED_TABLES + ff_sine_window_init(ff_sine_windows[index], 1 << index); +#endif +} -- cgit v1.2.3