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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
commit | 36d22d82aa202bb199967e9512281e9a53db42c9 (patch) | |
tree | 105e8c98ddea1c1e4784a60a5a6410fa416be2de /media/ffvpx/libavcodec/mpegaudio_tablegen.h | |
parent | Initial commit. (diff) | |
download | firefox-esr-upstream.tar.xz firefox-esr-upstream.zip |
Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'media/ffvpx/libavcodec/mpegaudio_tablegen.h')
-rw-r--r-- | media/ffvpx/libavcodec/mpegaudio_tablegen.h | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/media/ffvpx/libavcodec/mpegaudio_tablegen.h b/media/ffvpx/libavcodec/mpegaudio_tablegen.h new file mode 100644 index 0000000000..bae6962ac0 --- /dev/null +++ b/media/ffvpx/libavcodec/mpegaudio_tablegen.h @@ -0,0 +1,89 @@ +/* + * Header file for hardcoded mpegaudiodec tables + * + * Copyright (c) 2009 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_MPEGAUDIO_TABLEGEN_H +#define AVCODEC_MPEGAUDIO_TABLEGEN_H + +#include <stdint.h> +#include <math.h> +#include "libavutil/attributes.h" + +#if CONFIG_HARDCODED_TABLES +#define mpegaudio_tableinit() +#include "libavcodec/mpegaudio_tables.h" +#else +#if defined(BUILD_TABLES) || !USE_FLOATS +#define FIXED_TABLE +static uint32_t exp_table_fixed[512]; +static uint32_t expval_table_fixed[512][16]; +#endif + +#if defined(BUILD_TABLES) || USE_FLOATS +#define FLOAT_TABLE +static float exp_table_float[512]; +static float expval_table_float[512][16]; +#endif + +#define IMDCT_SCALAR 1.759 + +static av_cold void mpegaudio_tableinit(void) +{ + int i, value, exponent; + static const double exp2_lut[4] = { + 1.00000000000000000000, /* 2 ^ (0 * 0.25) */ + 1.18920711500272106672, /* 2 ^ (1 * 0.25) */ + M_SQRT2 , /* 2 ^ (2 * 0.25) */ + 1.68179283050742908606, /* 2 ^ (3 * 0.25) */ + }; + double pow43_lut[16]; + double exp2_base = 2.11758236813575084767080625169910490512847900390625e-22; // 2^(-72) + double exp2_val; + + for (i = 0; i < 16; ++i) + pow43_lut[i] = i * cbrt(i); + + for (exponent = 0; exponent < 512; exponent++) { + if (exponent && (exponent & 3) == 0) + exp2_base *= 2; + exp2_val = exp2_base * exp2_lut[exponent & 3] / IMDCT_SCALAR; + for (value = 0; value < 16; value++) { + double f = pow43_lut[value] * exp2_val; +#ifdef FIXED_TABLE + expval_table_fixed[exponent][value] = (f < 0xFFFFFFFF ? llrint(f) : 0xFFFFFFFF); +#endif +#ifdef FLOAT_TABLE + expval_table_float[exponent][value] = f; +#endif + } +#ifdef FIXED_TABLE + exp_table_fixed[exponent] = expval_table_fixed[exponent][1]; +#endif +#ifdef FLOAT_TABLE + exp_table_float[exponent] = expval_table_float[exponent][1]; +#endif + } +} +#undef FLOAT_TABLE +#undef FIXED_TABLE +#endif /* CONFIG_HARDCODED_TABLES */ + +#endif /* AVCODEC_MPEGAUDIO_TABLEGEN_H */ |