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https://github.com/shadps4-emu/ext-ffmpeg-core.git
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e30b7d7fe2
Contains the following squashed commits from the old branch: Initial commit Fix link order Add option to link against system ffmpeg, disable precompiled binaries for mingw Update macOS files for XCode 12 Update ffmpeg to 5.1.2 Add mjpeg encoder (#7) Add mjpeg2jpeg bitstream filter Add macOS-arm64 builds Add macOS arm64 to CMakeLists Add arm64-osx-release to build.yml dummy commit to trigger workflow Properly split macOS builds in build.yml Try to fix actions uploads Rename the builds Fix build.yml Fix typo in build.yml Amend CMakeLists using the correct check ci: change upload path to directly upload libraries ci: build and use universal binary on macOS ci: set macOS deployment target to macOS 11.0 ci: build FFMPEG prebuilt for each OS/architecture Add linux arm64 prebuilt. Add both x86_64 and arm64 prebuilts for macOS. ci: create release for pre-built FFMPEG cmake: download and use only necessary prebuilt FFMPEG Add arm64 windows prebuilt Co-authored-by: Seungyun Lee <khora.lee.0@gmail.com> Co-authored-by: shinra-electric <50119606+shinra-electric@users.noreply.github.com> Co-authored-by: SaturnSky <ikadro@gmail.com>
81 lines
2.4 KiB
C
Executable File
81 lines
2.4 KiB
C
Executable File
/*
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* Lagged Fibonacci PRNG
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* Copyright (c) 2008 Michael Niedermayer
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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_LFG_H
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#define AVUTIL_LFG_H
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#include <stdint.h>
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/**
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* Context structure for the Lagged Fibonacci PRNG.
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* The exact layout, types and content of this struct may change and should
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* not be accessed directly. Only its sizeof() is guranteed to stay the same
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* to allow easy instanciation.
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*/
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typedef struct AVLFG {
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unsigned int state[64];
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int index;
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} AVLFG;
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void av_lfg_init(AVLFG *c, unsigned int seed);
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/**
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* Seed the state of the ALFG using binary data.
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*
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* Return value: 0 on success, negative value (AVERROR) on failure.
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*/
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int av_lfg_init_from_data(AVLFG *c, const uint8_t *data, unsigned int length);
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/**
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* Get the next random unsigned 32-bit number using an ALFG.
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*
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* Please also consider a simple LCG like state= state*1664525+1013904223,
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* it may be good enough and faster for your specific use case.
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*/
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static inline unsigned int av_lfg_get(AVLFG *c){
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unsigned a = c->state[c->index & 63] = c->state[(c->index-24) & 63] + c->state[(c->index-55) & 63];
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c->index += 1U;
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return a;
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}
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/**
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* Get the next random unsigned 32-bit number using a MLFG.
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*
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* Please also consider av_lfg_get() above, it is faster.
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*/
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static inline unsigned int av_mlfg_get(AVLFG *c){
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unsigned int a= c->state[(c->index-55) & 63];
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unsigned int b= c->state[(c->index-24) & 63];
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a = c->state[c->index & 63] = 2*a*b+a+b;
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c->index += 1U;
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return a;
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}
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/**
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* Get the next two numbers generated by a Box-Muller Gaussian
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* generator using the random numbers issued by lfg.
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*
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* @param out array where the two generated numbers are placed
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*/
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void av_bmg_get(AVLFG *lfg, double out[2]);
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#endif /* AVUTIL_LFG_H */
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