mirror of
https://github.com/hrydgard/ppsspp.git
synced 2026-11-01 12:07:31 +01:00
Henrik RydgårdandClaude Opus 5.5
d0e3141f43
The ffmpeg submodule held prebuilt libraries for every platform next to the sources (about 1.5 GB checked out), and nothing uses those any more. Only the needed sources are copied in, from the submodule's commit, along with every header and template they include. The path is new, so checking out commits on either side of this works. It's also cut down to what PPSSPP uses: the H.264, AAC, MP3, ATRAC3 and ATRAC3+ decoders, the H.264 parser, the demuxers as before, and the FFV1 encoder, AVI muxer and file protocol for AVI dumping. config.h takes its CONFIG_ values from FFmpeg 3.0.2's own configure run with just those enabled. The raw H.264 demuxer stays even though nothing opens raw H.264: probing PSMF data uses it to identify the video stream's codec, which otherwise comes out as none. On top of that: - The files nothing links (configure would build them, but they're never pulled out of the static library, going by the GCC link map) are left out: mostly libavutil's crypto and hashing and the alternative DCT/IDCT/FFT versions. - libswresample isn't built, now that nothing uses it. - The H.264 decoder only does 8-bit video, which is all the PSP has. The SPS parser rejects any other bit depth, and the DSP files no longer build their 9- to 16-bit variants, which the linker kept because the init functions pick one by bit depth at run time. That's 160 files to compile instead of 277, and 391 of FFmpeg's vendored, about 5.8 MB. The README in ext/ffmpeg has what was done, the PPSSPP patches in the copy, how to add a component, and the tradeoffs. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
92 lines
3.1 KiB
C
92 lines
3.1 KiB
C
/*
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* Header file for hardcoded mpegaudiodec 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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#ifndef AVCODEC_MPEGAUDIO_TABLEGEN_H
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#define AVCODEC_MPEGAUDIO_TABLEGEN_H
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#include <stdint.h>
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#include <math.h>
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#include "libavutil/attributes.h"
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#define TABLE_4_3_SIZE (8191 + 16)*4
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#if CONFIG_HARDCODED_TABLES
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#define mpegaudio_tableinit()
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#include "libavcodec/mpegaudio_tables.h"
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#else
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static int8_t table_4_3_exp[TABLE_4_3_SIZE];
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static uint32_t table_4_3_value[TABLE_4_3_SIZE];
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static uint32_t exp_table_fixed[512];
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static uint32_t expval_table_fixed[512][16];
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static float exp_table_float[512];
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static float expval_table_float[512][16];
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#define FRAC_BITS 23
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#define IMDCT_SCALAR 1.759
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static av_cold void mpegaudio_tableinit(void)
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{
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int i, value, exponent;
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static const double exp2_lut[4] = {
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1.00000000000000000000, /* 2 ^ (0 * 0.25) */
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1.18920711500272106672, /* 2 ^ (1 * 0.25) */
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M_SQRT2 , /* 2 ^ (2 * 0.25) */
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1.68179283050742908606, /* 2 ^ (3 * 0.25) */
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};
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static double pow43_lut[16];
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double exp2_base = 2.11758236813575084767080625169910490512847900390625e-22; // 2^(-72)
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double exp2_val;
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double pow43_val = 0;
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for (i = 0; i < 16; ++i)
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pow43_lut[i] = i * cbrt(i);
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for (i = 1; i < TABLE_4_3_SIZE; i++) {
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double f, fm;
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int e, m;
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double value = i / 4;
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if ((i & 3) == 0)
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pow43_val = value / IMDCT_SCALAR * cbrt(value);
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f = pow43_val * exp2_lut[i & 3];
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fm = frexp(f, &e);
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m = llrint(fm * (1LL << 31));
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e += FRAC_BITS - 31 + 5 - 100;
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/* normalized to FRAC_BITS */
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table_4_3_value[i] = m;
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table_4_3_exp[i] = -e;
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}
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for (exponent = 0; exponent < 512; exponent++) {
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if (exponent && (exponent & 3) == 0)
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exp2_base *= 2;
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exp2_val = exp2_base * exp2_lut[exponent & 3] / IMDCT_SCALAR;
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for (value = 0; value < 16; value++) {
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double f = pow43_lut[value] * exp2_val;
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expval_table_fixed[exponent][value] = (f < 0xFFFFFFFF ? llrint(f) : 0xFFFFFFFF);
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expval_table_float[exponent][value] = f;
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}
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exp_table_fixed[exponent] = expval_table_fixed[exponent][1];
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exp_table_float[exponent] = expval_table_float[exponent][1];
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}
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}
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#endif /* CONFIG_HARDCODED_TABLES */
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#endif /* AVCODEC_MPEGAUDIO_TABLEGEN_H */
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