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https://github.com/FFmpeg/FFmpeg.git
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469cd8d7fa
This patch replaces the transform used in AAC with lavu/tx and removes the limitation on only being able to decode 960-sample files with the float decoder. This commit also removes a whole bunch of unnecessary and slow lifting steps the decoder did to compensate for the poor accuracy of the old integer transformation code. Overall float decoder speedup on Zen 3 for 64kbps: 32%
74 lines
2.3 KiB
C
74 lines
2.3 KiB
C
/*
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* Header file for hardcoded sine windows
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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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#ifndef AVCODEC_SINEWIN_FIXED_TABLEGEN_H
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#define AVCODEC_SINEWIN_FIXED_TABLEGEN_H
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#ifdef BUILD_TABLES
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#undef DECLARE_ALIGNED
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#define DECLARE_ALIGNED(align, type, name) type name
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#else
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#include "libavutil/mem_internal.h"
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#endif
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#define SINETABLE(size) \
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static SINETABLE_CONST DECLARE_ALIGNED(32, int, sine_##size##_fixed)[size]
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#if CONFIG_HARDCODED_TABLES
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#define init_sine_windows_fixed()
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#define SINETABLE_CONST const
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#include "libavcodec/sinewin_fixed_tables.h"
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#else
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// do not use libavutil/libm.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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#include "libavutil/attributes.h"
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#define SINETABLE_CONST
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SINETABLE( 120);
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SINETABLE( 128);
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SINETABLE( 480);
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SINETABLE( 512);
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SINETABLE( 960);
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SINETABLE(1024);
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#define SIN_FIX(a) (int)floor((a) * 0x80000000 + 0.5)
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// Generate a sine window.
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static av_cold void sine_window_init_fixed(int *window, int n)
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{
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for (int i = 0; i < n; i++)
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window[i] = SIN_FIX(sinf((i + 0.5) * (M_PI / (2.0 * n))));
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}
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static av_cold void init_sine_windows_fixed(void)
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{
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sine_window_init_fixed(sine_120_fixed, 120);
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sine_window_init_fixed(sine_128_fixed, 128);
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sine_window_init_fixed(sine_480_fixed, 480);
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sine_window_init_fixed(sine_512_fixed, 512);
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sine_window_init_fixed(sine_960_fixed, 960);
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sine_window_init_fixed(sine_1024_fixed, 1024);
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}
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#endif /* CONFIG_HARDCODED_TABLES */
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#endif /* AVCODEC_SINEWIN_FIXED_TABLEGEN_H */
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