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view docs/html/sdllockaudio.html @ 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 355632dca928
children
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<HTML
><HEAD
><TITLE
>SDL_LockAudio</TITLE
><META
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CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+
"><LINK
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><BODY
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><H1
><A
NAME="SDLLOCKAUDIO"
></A
>SDL_LockAudio</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN7134"
></A
><H2
>Name</H2
>SDL_LockAudio&nbsp;--&nbsp;Lock out the callback function</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN7137"
></A
><H2
>Synopsis</H2
><DIV
CLASS="FUNCSYNOPSIS"
><A
NAME="AEN7138"
></A
><P
></P
><PRE
CLASS="FUNCSYNOPSISINFO"
>#include "SDL.h"</PRE
><P
><CODE
><CODE
CLASS="FUNCDEF"
>void <B
CLASS="FSFUNC"
>SDL_LockAudio</B
></CODE
>(void);</CODE
></P
><P
></P
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN7144"
></A
><H2
>Description</H2
><P
>The lock manipulated by these functions protects the callback function.
During a LockAudio period, you can be guaranteed that the
callback function is not running.  Do not call these from the callback
function or you will cause deadlock.</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN7147"
></A
><H2
>See Also</H2
><P
><A
HREF="sdlopenaudio.html"
><TT
CLASS="FUNCTION"
>SDL_OpenAudio</TT
></A
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