Mercurial > sdl-ios-xcode

annotate src/timer/macos/FastTimes.h @ 3880:74e828c64315 SDL-1.2

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Fixed bug #292 I might be on crack here. It looks like SDL_ConvertMono() in src/audio/SDL_audiocvt.c adds the left and right channels of a stereo stream together, and clamps the new mono channel if it would overflow. Shouldn't it be dividing by 2 to average the two sample points instead of clamping? Otherwise the mono sample point's volume doubles in the conversion. This would also make the conversion faster, as it replaces two branches per sample frame with a bitwise shift. --ryan.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 24 Sep 2006 15:45:37 +0000
parents d910939febfa
children 782fd950bd46 c121d94672cb
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1 /* File "FastTimes.h" - Original code by Matt Slot <fprefect@ambrosiasw.com> */
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2 #include "SDL_config.h"
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3 /* Created 4/24/99 - This file is hereby placed in the public domain */
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4 /* Updated 5/21/99 - Calibrate to VIA, add TBR support, renamed functions */
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5 /* Updated 10/4/99 - Use AbsoluteToNanoseconds() in case Absolute = double */
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6 /* Updated 2/15/00 - Check for native Time Manager, no need to calibrate */
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7 /* Updated 3/21/00 - Fixed ns conversion, create 2 different scale factors */
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8 /* Updated 5/03/00 - Added copyright and placed into PD. No code changes */
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9
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10 /* This file is Copyright (C) Matt Slot, 1999-2000. It is hereby placed into
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11 the public domain. The author makes no warranty as to fitness or stability */
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12
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13 #ifndef __FAST_TIMES_HEADER__
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14 #define __FAST_TIMES_HEADER__
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15
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16 /* **** **** **** **** **** **** **** **** **** **** **** **** **** **** **** */
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17 /* **** **** **** **** **** **** **** **** **** **** **** **** **** **** **** */
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18
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19 extern void FastInitialize(void);
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20 extern UInt64 FastMicroseconds(void);
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21 extern UInt64 FastMilliseconds(void);
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22 extern StringPtr FastMethod(void);
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23
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24 /* **** **** **** **** **** **** **** **** **** **** **** **** **** **** **** */
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25 /* **** **** **** **** **** **** **** **** **** **** **** **** **** **** **** */
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26
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27 #endif /* __FAST_TIMES_HEADER__ */