From 07201cfd793f47729caf8667acad41ed1869bf32 Mon Sep 17 00:00:00 2001 From: Sven Gothel Date: Mon, 26 Aug 2013 09:48:21 +0200 Subject: ffmpeg/libav: lavc54.lavf54.lavu52 -> lavc54.lavf54.lavu52.lavr01: Adding libavresample of version 9 --- .../lavc54.lavf54.lavu52.lavr01/libavutil/lfg.h | 62 ++++++++++++++++++++++ 1 file changed, 62 insertions(+) create mode 100644 make/stub_includes/libav/lavc54.lavf54.lavu52.lavr01/libavutil/lfg.h (limited to 'make/stub_includes/libav/lavc54.lavf54.lavu52.lavr01/libavutil/lfg.h') diff --git a/make/stub_includes/libav/lavc54.lavf54.lavu52.lavr01/libavutil/lfg.h b/make/stub_includes/libav/lavc54.lavf54.lavu52.lavr01/libavutil/lfg.h new file mode 100644 index 000000000..5e526c1da --- /dev/null +++ b/make/stub_includes/libav/lavc54.lavf54.lavu52.lavr01/libavutil/lfg.h @@ -0,0 +1,62 @@ +/* + * Lagged Fibonacci PRNG + * Copyright (c) 2008 Michael Niedermayer + * + * This file is part of Libav. + * + * Libav is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * Libav is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with Libav; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#ifndef AVUTIL_LFG_H +#define AVUTIL_LFG_H + +typedef struct AVLFG { + unsigned int state[64]; + int index; +} AVLFG; + +void av_lfg_init(AVLFG *c, unsigned int seed); + +/** + * Get the next random unsigned 32-bit number using an ALFG. + * + * Please also consider a simple LCG like state= state*1664525+1013904223, + * it may be good enough and faster for your specific use case. + */ +static inline unsigned int av_lfg_get(AVLFG *c){ + c->state[c->index & 63] = c->state[(c->index-24) & 63] + c->state[(c->index-55) & 63]; + return c->state[c->index++ & 63]; +} + +/** + * Get the next random unsigned 32-bit number using a MLFG. + * + * Please also consider av_lfg_get() above, it is faster. + */ +static inline unsigned int av_mlfg_get(AVLFG *c){ + unsigned int a= c->state[(c->index-55) & 63]; + unsigned int b= c->state[(c->index-24) & 63]; + return c->state[c->index++ & 63] = 2*a*b+a+b; +} + +/** + * Get the next two numbers generated by a Box-Muller Gaussian + * generator using the random numbers issued by lfg. + * + * @param out array where the two generated numbers are placed + */ +void av_bmg_get(AVLFG *lfg, double out[2]); + +#endif /* AVUTIL_LFG_H */ -- cgit v1.2.3