mirror of
https://github.com/hrydgard/ppsspp.git
synced 2026-11-02 12:32:03 +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
2.8 KiB
C
92 lines
2.8 KiB
C
/*
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* copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
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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 AVUTIL_CRC_H
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#define AVUTIL_CRC_H
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#include <stdint.h>
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#include <stddef.h>
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#include "attributes.h"
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#include "version.h"
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/**
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* @defgroup lavu_crc32 CRC32
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* @ingroup lavu_crypto
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* @{
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*/
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typedef uint32_t AVCRC;
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typedef enum {
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AV_CRC_8_ATM,
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AV_CRC_16_ANSI,
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AV_CRC_16_CCITT,
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AV_CRC_32_IEEE,
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AV_CRC_32_IEEE_LE, /*< reversed bitorder version of AV_CRC_32_IEEE */
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AV_CRC_16_ANSI_LE, /*< reversed bitorder version of AV_CRC_16_ANSI */
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#if FF_API_CRC_BIG_TABLE
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AV_CRC_24_IEEE = 12,
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#else
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AV_CRC_24_IEEE,
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#endif /* FF_API_CRC_BIG_TABLE */
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AV_CRC_MAX, /*< Not part of public API! Do not use outside libavutil. */
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}AVCRCId;
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/**
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* Initialize a CRC table.
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* @param ctx must be an array of size sizeof(AVCRC)*257 or sizeof(AVCRC)*1024
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* @param le If 1, the lowest bit represents the coefficient for the highest
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* exponent of the corresponding polynomial (both for poly and
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* actual CRC).
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* If 0, you must swap the CRC parameter and the result of av_crc
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* if you need the standard representation (can be simplified in
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* most cases to e.g. bswap16):
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* av_bswap32(crc << (32-bits))
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* @param bits number of bits for the CRC
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* @param poly generator polynomial without the x**bits coefficient, in the
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* representation as specified by le
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* @param ctx_size size of ctx in bytes
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* @return <0 on failure
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*/
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int av_crc_init(AVCRC *ctx, int le, int bits, uint32_t poly, int ctx_size);
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/**
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* Get an initialized standard CRC table.
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* @param crc_id ID of a standard CRC
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* @return a pointer to the CRC table or NULL on failure
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*/
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const AVCRC *av_crc_get_table(AVCRCId crc_id);
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/**
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* Calculate the CRC of a block.
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* @param crc CRC of previous blocks if any or initial value for CRC
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* @return CRC updated with the data from the given block
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*
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* @see av_crc_init() "le" parameter
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*/
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uint32_t av_crc(const AVCRC *ctx, uint32_t crc,
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const uint8_t *buffer, size_t length) av_pure;
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/**
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* @}
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*/
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#endif /* AVUTIL_CRC_H */
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