mirror of
https://github.com/hrydgard/ppsspp.git
synced 2026-11-02 20:42:29 +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>
98 lines
3.3 KiB
C
98 lines
3.3 KiB
C
/*
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* common functions for the ATRAC family of decoders
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*
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* Copyright (c) 2009-2013 Maxim Poliakovski
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* Copyright (c) 2009 Benjamin Larsson
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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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/**
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* @file
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* ATRAC common header
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*/
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#ifndef AVCODEC_ATRAC_H
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#define AVCODEC_ATRAC_H
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/**
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* Gain control parameters for one subband.
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*/
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typedef struct AtracGainInfo {
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int num_points; ///< number of gain control points
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int lev_code[7]; ///< level at corresponding control point
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int loc_code[7]; ///< location of gain control points
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} AtracGainInfo;
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/**
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* Gain compensation context structure.
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*/
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typedef struct AtracGCContext {
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float gain_tab1[16]; ///< gain compensation level table
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float gain_tab2[31]; ///< gain compensation interpolation table
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int id2exp_offset; ///< offset for converting level index into level exponent
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int loc_scale; ///< scale of location code = 2^loc_scale samples
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int loc_size; ///< size of location code in samples
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} AtracGCContext;
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extern float ff_atrac_sf_table[64];
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/**
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* Generate common tables.
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*/
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void ff_atrac_generate_tables(void);
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/**
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* Initialize gain compensation context.
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*
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* @param gctx pointer to gain compensation context to initialize
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* @param id2exp_offset offset for converting level index into level exponent
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* @param loc_scale location size factor
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*/
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void ff_atrac_init_gain_compensation(AtracGCContext *gctx, int id2exp_offset,
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int loc_scale);
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/**
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* Apply gain compensation and perform the MDCT overlapping part.
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*
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* @param gctx pointer to gain compensation context
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* @param in input buffer
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* @param prev previous buffer to perform overlap against
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* @param gc_now gain control information for current frame
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* @param gc_next gain control information for next frame
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* @param num_samples number of samples to process
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* @param out output data goes here
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*/
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void ff_atrac_gain_compensation(AtracGCContext *gctx, float *in, float *prev,
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AtracGainInfo *gc_now, AtracGainInfo *gc_next,
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int num_samples, float *out);
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/**
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* Quadrature mirror synthesis filter.
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*
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* @param inlo lower part of spectrum
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* @param inhi higher part of spectrum
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* @param nIn size of spectrum buffer
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* @param pOut out buffer
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* @param delayBuf delayBuf buffer
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* @param temp temp buffer
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*/
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void ff_atrac_iqmf(float *inlo, float *inhi, unsigned int nIn, float *pOut,
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float *delayBuf, float *temp);
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#endif /* AVCODEC_ATRAC_H */
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