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59 lines
1.8 KiB
59 lines
1.8 KiB
/* |
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* Header file for hardcoded MDCT tables |
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* |
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* Copyright (c) 2009 Reimar Döffinger <Reimar.Doeffinger@gmx.de> |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include <assert.h> |
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// do not use libavutil/mathematics.h since this is compiled both |
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// for the host and the target and config.h is only valid for the target |
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#include <math.h> |
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#if !CONFIG_HARDCODED_TABLES |
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SINETABLE( 32); |
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SINETABLE( 64); |
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SINETABLE( 128); |
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SINETABLE( 256); |
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SINETABLE( 512); |
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SINETABLE(1024); |
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SINETABLE(2048); |
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SINETABLE(4096); |
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#else |
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#include "libavcodec/mdct_tables.h" |
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#endif |
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SINETABLE_CONST float * const ff_sine_windows[] = { |
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NULL, NULL, NULL, NULL, NULL, // unused |
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ff_sine_32 , ff_sine_64 , |
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ff_sine_128, ff_sine_256, ff_sine_512, ff_sine_1024, ff_sine_2048, ff_sine_4096 |
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}; |
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// Generate a sine window. |
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av_cold void ff_sine_window_init(float *window, int n) { |
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int i; |
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for(i = 0; i < n; i++) |
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window[i] = sinf((i + 0.5) * (M_PI / (2.0 * n))); |
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} |
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av_cold void ff_init_ff_sine_windows(int index) { |
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assert(index >= 0 && index < FF_ARRAY_ELEMS(ff_sine_windows)); |
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#if !CONFIG_HARDCODED_TABLES |
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ff_sine_window_init(ff_sine_windows[index], 1 << index); |
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#endif |
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}
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