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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 15:56:36 +0000
parents 355632dca928
children
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<HTML
><HEAD
><TITLE
>SDL_UnlockSurface</TITLE
><META
NAME="GENERATOR"
CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+
"><LINK
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TITLE="SDL Library Documentation"
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><BODY
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><H1
><A
NAME="SDLUNLOCKSURFACE"
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>SDL_UnlockSurface</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN1962"
></A
><H2
>Name</H2
>SDL_UnlockSurface&nbsp;--&nbsp;Unlocks a previously locked surface.</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN1965"
></A
><H2
>Synopsis</H2
><DIV
CLASS="FUNCSYNOPSIS"
><A
NAME="AEN1966"
></A
><P
></P
><PRE
CLASS="FUNCSYNOPSISINFO"
>#include "SDL.h"</PRE
><P
><CODE
><CODE
CLASS="FUNCDEF"
>void <B
CLASS="FSFUNC"
>SDL_UnlockSurface</B
></CODE
>(SDL_Surface *surface);</CODE
></P
><P
></P
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN1972"
></A
><H2
>Description</H2
><P
>Surfaces that were previously locked using <TT
CLASS="FUNCTION"
>SDL_LockSurface</TT
> must be unlocked with <TT
CLASS="FUNCTION"
>SDL_UnlockSurface</TT
>. Surfaces should be unlocked as soon as possible.</P
><P
>It should be noted that since 1.1.8, surface locks are recursive. See <A
HREF="sdllocksurface.html"
><TT
CLASS="FUNCTION"
>SDL_LockSurface</TT
></A
>.</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN1980"
></A
><H2
>See Also</H2
><P
><A
HREF="sdllocksurface.html"
><TT
CLASS="FUNCTION"
>SDL_LockSurface</TT
></A
></P
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