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FFmpeg/libavcodec/aacsbr_fixed_tablegen.h
Ganesh Ajjanagadde cb93df0dcb avcodec/aacsbr_tablegen: always initialize tables at runtime
This gets rid of virtually useless hardcoded tables hackery. The reason
it is useless is that a 320 element lut is anyway placed regardless of
--enable-hardcoded-tables, from which all necessary tables are trivially
derived at runtime at very low cost:

sample benchmark (x86-64, Haswell, GNU/Linux, single run is really
what is relevant here since looping drastically changes the bench). Fluctuations
are on the order of 10% for the single run test:
39400 decicycles in aacsbr_tableinit,       1 runs,      0 skips
25325 decicycles in aacsbr_tableinit,       2 runs,      0 skips
18475 decicycles in aacsbr_tableinit,       4 runs,      0 skips
15008 decicycles in aacsbr_tableinit,       8 runs,      0 skips
13016 decicycles in aacsbr_tableinit,      16 runs,      0 skips
12005 decicycles in aacsbr_tableinit,      32 runs,      0 skips
11546 decicycles in aacsbr_tableinit,      64 runs,      0 skips
11506 decicycles in aacsbr_tableinit,     128 runs,      0 skips
11500 decicycles in aacsbr_tableinit,     256 runs,      0 skips
11183 decicycles in aacsbr_tableinit,     509 runs,      3 skips

Tested with FATE with/without --enable-hardcoded-tables.

Reviewed-by: Rostislav Pehlivanov <atomnuker@gmail.com>
Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>
2015-12-09 07:36:58 -05:00

29 lines
1.0 KiB
C

/*
* Header file for hardcoded AAC SBR windows
*
* Copyright (c) 2014 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef AVCODEC_AACSBR_FIXED_TABLEGEN_H
#define AVCODEC_AACSBR_FIXED_TABLEGEN_H
#include "aacsbr_tablegen_common.h"
#endif /* AVCODEC_AACSBR_FIXED_TABLEGEN_H */