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095946afa7
* qatar/release/0.7: (65 commits) riff: Add mpgv MPEG-2 fourcc Update Changelog matroskadec: fix integer underflow if header length < probe length. ffmpeg: fix operation with --disable-avfilter vf_libopencv: replace opencv/cxtypes.h #include by opencv/cxcore.h build: Create mlib optimization directories during out-of-tree builds. changelog: misc typo and wording fixes (cherry picked from commitb047941d7d) doc: Remove outdated comments about gcc 2.95 and gcc 3.3 support. (cherry picked from commit5ccbf80963) matroskadec: matroska_read_seek after after EBML_STOP leads to failure. Update RELEASE file update Changelog mt: proper locking around release_buffer calls. vp8/mt: flush worker thread, not application thread context, on seek. docs: Mention the upstream bugzilla url about the dlltool vs MSVC issue docs: Use proper markup for a literal command line option docs: Don't recommend adding --enable-memalign-hack docs: Remove needless configure options oggdec: prevent heap corruption. oggdec: Abort Ogg header parsing when encountering a data packet. Add LGPL license boilerplate to files lacking it. ... Conflicts: Changelog configure doc/developer.texi libavcodec/libvpxenc.c libavcodec/rawdec.c libavfilter/x86/gradfun.c libavformat/Makefile libavformat/isom.c Merged-by: Michael Niedermayer <michaelni@gmx.at>
63 lines
1.9 KiB
C
63 lines
1.9 KiB
C
/*
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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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typedef struct {
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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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* 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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c->state[c->index & 63] = c->state[(c->index-24) & 63] + c->state[(c->index-55) & 63];
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return c->state[c->index++ & 63];
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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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return c->state[c->index++ & 63] = 2*a*b+a+b;
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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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