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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
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><A
NAME="EVENTFUNCTIONS"
>Event Functions.</A
></H1
><DIV
CLASS="TOC"
><DL
><DT
><B
>Table of Contents</B
></DT
><DT
><A
HREF="sdlpumpevents.html"
>SDL_PumpEvents</A
> &#8212; Pumps the event loop, gathering events from the input devices.</DT
><DT
><A
HREF="sdlpeepevents.html"
>SDL_PeepEvents</A
> &#8212; Checks the event queue for messages and optionally returns them.</DT
><DT
><A
HREF="sdlpollevent.html"
>SDL_PollEvent</A
> &#8212; Polls for currently pending events.</DT
><DT
><A
HREF="sdlwaitevent.html"
>SDL_WaitEvent</A
> &#8212; Waits indefinitely for the next available event.</DT
><DT
><A
HREF="sdlpushevent.html"
>SDL_PushEvent</A
> &#8212; Pushes an event onto the event queue</DT
><DT
><A
HREF="sdlseteventfilter.html"
>SDL_SetEventFilter</A
> &#8212; Sets up a filter to process all events before they are posted 
to the event queue.</DT
><DT
><A
HREF="sdlgeteventfilter.html"
>SDL_GetEventFilter</A
> &#8212; Retrieves a pointer to he event filter</DT
><DT
><A
HREF="sdleventstate.html"
>SDL_EventState</A
> &#8212; This function allows you to set the state of processing certain events.</DT
><DT
><A
HREF="sdlgetkeystate.html"
>SDL_GetKeyState</A
> &#8212; Get a snapshot of the current keyboard state</DT
><DT
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>SDL_GetModState</A
> &#8212; Get the state of modifier keys.</DT
><DT
><A
HREF="sdlsetmodstate.html"
>SDL_SetModState</A
> &#8212; Set the current key modifier state</DT
><DT
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HREF="sdlgetkeyname.html"
>SDL_GetKeyName</A
> &#8212; Get the name of an SDL virtual keysym</DT
><DT
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>SDL_EnableUNICODE</A
> &#8212; Enable UNICODE translation</DT
><DT
><A
HREF="sdlenablekeyrepeat.html"
>SDL_EnableKeyRepeat</A
> &#8212; Set keyboard repeat rate.</DT
><DT
><A
HREF="sdlgetmousestate.html"
>SDL_GetMouseState</A
> &#8212; Retrieve the current state of the mouse</DT
><DT
><A
HREF="sdlgetrelativemousestate.html"
>SDL_GetRelativeMouseState</A
> &#8212; Retrieve the current state of the mouse</DT
><DT
><A
HREF="sdlgetappstate.html"
>SDL_GetAppState</A
> &#8212; Get the state of the application</DT
><DT
><A
HREF="sdljoystickeventstate.html"
>SDL_JoystickEventState</A
> &#8212; Enable/disable joystick event polling</DT
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><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
HREF="sdlpumpevents.html"
>SDL_PumpEvents</A
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
>Pumps the event loop, gathering events from the input devices</TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
HREF="sdlpeepevents.html"
>SDL_PeepEvents</A
></TD
><TD
ALIGN="LEFT"
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>Checks the event queue for messages and optionally returns them</TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
HREF="sdlpollevent.html"
>SDL_PollEvent</A
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
>Polls for currently pending events</TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
HREF="sdlwaitevent.html"
>SDL_WaitEvent</A
></TD
><TD
ALIGN="LEFT"
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>Waits indefinitely for the next available event</TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
HREF="sdlpushevent.html"
>SDL_PushEvent</A
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
>Pushes an event onto the event queue</TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
HREF="sdlseteventfilter.html"
>SDL_SetEventFilter</A
></TD
><TD
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>Sets up a filter to process all events</TD
></TR
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><A
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>SDL_EventState</A
></TD
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>Allows you to set the state of processing certain events</TD
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><A
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>SDL_GetKeyState</A
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
>Get a snapshot of the current keyboard state</TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
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>SDL_GetModState</A
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
>Get the state of modifier keys</TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
HREF="sdlsetmodstate.html"
>SDL_SetModState</A
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
>Set the state of modifier keys</TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
HREF="sdlgetkeyname.html"
>SDL_GetKeyName</A
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
>Get the name of an SDL virtual keysym</TD
></TR
><TR
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><A
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>SDL_EnableUNICODE</A
></TD
><TD
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>Enable UNICODE translation</TD
></TR
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><TD
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><A
HREF="sdlenablekeyrepeat.html"
>SDL_EnableKeyRepeat</A
></TD
><TD
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>Set keyboard repeat rate</TD
></TR
><TR
><TD
ALIGN="LEFT"
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><A
HREF="sdlgetmousestate.html"
>SDL_GetMouseState</A
></TD
><TD
ALIGN="LEFT"
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>Retrieve the current state of the mouse</TD
></TR
><TR
><TD
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><A
HREF="sdlgetrelativemousestate.html"
>SDL_GetRelativeMouseState</A
></TD
><TD
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>Retrieve the current state of the mouse</TD
></TR
><TR
><TD
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><A
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>SDL_GetAppState</A
></TD
><TD
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VALIGN="TOP"
>Get the state of the application</TD
></TR
><TR
><TD
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VALIGN="TOP"
><A
HREF="sdljoystickeventstate.html"
>SDL_JoystickEventState</A
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>Enable/disable joystick event polling</TD
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