From f1d1c9849c8e27cccb46cf9c0d0ccb59da3f91f9 Mon Sep 17 00:00:00 2001 From: Klaus Schmidinger Date: Mon, 6 Aug 2001 18:00:00 +0200 Subject: Version 0.90 - Modified the display of the channel group separators (thanks to Markus Lang for this suggestion). - Added support for replaying DVDs (thanks to Andreas Schultz). See INSTALL for instructions on how to compile VDR with DVD support. - Fixed replay progress display in case replay is paused while watching an ongoing recording. - Ringbuffer uses semaphores to signal empty/full conditions. - Fixed calculating the timeout value in cFile::FileReady() (thanks to Wolfgang Henselmann-Weiss). --- ac3dec/dither.h | 37 +++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) create mode 100644 ac3dec/dither.h (limited to 'ac3dec/dither.h') diff --git a/ac3dec/dither.h b/ac3dec/dither.h new file mode 100644 index 0000000..6d68e1b --- /dev/null +++ b/ac3dec/dither.h @@ -0,0 +1,37 @@ +/* + * dither.h + * + * Copyright (C) Aaron Holtzman - May 1999 + * + * This file is part of ac3dec, a free Dolby AC-3 stream decoder. + * + * ac3dec is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2, or (at your option) + * any later version. + * + * ac3dec 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with GNU Make; see the file COPYING. If not, write to + * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. + * + */ + + +extern uint_16 lfsr_state; +extern const uint_16 dither_lut[256]; + +static inline uint_16 dither_gen(void) +{ + sint_16 state; + + state = dither_lut[lfsr_state >> 8] ^ (lfsr_state << 8); + + lfsr_state = (uint_16) state; + + return ((state * (sint_32) (0.707106 * 256.0))>>8); +} -- cgit v1.2.3