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Editors Note: The original patch was modified to use SDL_Delay() instead of nanosleep because nanosleep may not be portable to all systems using SDL with the ALSA backend. This may be a moot point with the switch to blocking writes anyway... Date: Sat, 27 Dec 2003 21:47:36 +0100 From: Michel Daenzer To: Debian Bug Tracking System Subject: [SDL] Bug#225252: [PATCH] ALSA fixes Package: libsdl1.2debian-all Version: 1.2.6-2 Severity: normal Tags: patch For SDL 1.2.6, the ALSA backend was changed to call snd_pcm_open() with SND_PCM_NONBLOCK. That's a good idea per se, however, it causes high CPU usage, interrupted sound and stuttering in some games here. Taking a nanosleep whenever snd_pcm_writei() returns -EAGAIN fixes this, but I think it's more efficient to use blocking mode for the actual sound playback. Feedback from the SDL and ALSA lists appreciated. The patch also fixes the default ALSA device to be used.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 04 Jan 2004 15:40:50 +0000
parents e5bc29de3f0a
children 355632dca928
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<HTML
><HEAD
><TITLE
>SDL_CDtrack</TITLE
><META
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><HR
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><H1
><A
NAME="SDLCDTRACK"
>SDL_CDtrack</A
></H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN7240"
></A
><H2
>Name</H2
>SDL_CDtrack&nbsp;--&nbsp;CD Track Information Structure</DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN7243"
></A
><H2
>Structure Definition</H2
><PRE
CLASS="PROGRAMLISTING"
>typedef struct{
  Uint8 id;
  Uint8 type;
  Uint32 length;
  Uint32 offset;
} SDL_CDtrack;</PRE
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN7246"
></A
><H2
>Structure Data</H2
><DIV
CLASS="INFORMALTABLE"
><A
NAME="AEN7248"
></A
><P
></P
><TABLE
BORDER="0"
CLASS="CALSTABLE"
><TBODY
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="STRUCTFIELD"
><I
>id</I
></TT
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
>Track number (0-99)</TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="STRUCTFIELD"
><I
>type</I
></TT
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="LITERAL"
>SDL_AUDIO_TRACK</TT
> or <TT
CLASS="LITERAL"
>SDL_DATA_TRACK</TT
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="STRUCTFIELD"
><I
>length</I
></TT
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
>Length, in frames, of this track</TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="STRUCTFIELD"
><I
>offset</I
></TT
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
>Frame offset to the beginning of this track</TD
></TR
></TBODY
></TABLE
><P
></P
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN7269"
></A
><H2
>Description</H2
><P
><SPAN
CLASS="STRUCTNAME"
>SDL_CDtrack</SPAN
> stores data on each track on a CD, its fields should be pretty self explainatory. It is a member a the <A
HREF="sdlcd.html"
><SPAN
CLASS="STRUCTNAME"
>SDL_CD</SPAN
></A
> structure.</P
><DIV
CLASS="NOTE"
><BLOCKQUOTE
CLASS="NOTE"
><P
><B
>Note: </B
>Frames can be converted to standard timings. There are <TT
CLASS="LITERAL"
>CD_FPS</TT
> frames per second, so <SPAN
CLASS="STRUCTNAME"
>SDL_CDtrack</SPAN
>.<TT
CLASS="STRUCTFIELD"
><I
>length</I
></TT
>/<TT
CLASS="LITERAL"
>CD_FPS</TT
>=length_in_seconds.</P
></BLOCKQUOTE
></DIV
></DIV
><DIV
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><A
NAME="AEN7281"
></A
><H2
>See Also</H2
><P
><A
HREF="sdlcd.html"
><SPAN
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>SDL_CD</SPAN
></A
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