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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 | 74212992fb08 |
| children | 05c551e5bc64 |
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These are test programs for the SDL library: testver Check the version and dynamic loading and endianness testtypes Check to see if the data types are the correct size testhread Hacked up test of multi-threading testlock Hacked up test of multi-threading and locking testerror Tests multi-threaded error handling testsem Tests SDL's semaphore implementation testtimer Test the timer facilities loopwave Audio test -- loop playing a WAV file testcdrom Sample audio CD control program testkeys List the available keyboard keys testvidinfo Show the pixel format of the display checkkeys Watch the key events to check the keyboard testwin Display a BMP image at various depths graywin Display a gray gradient and center mouse on spacebar testsprite Example of fast sprite movement on the screen testbitmap Test displaying 1-bit bitmaps testalpha Display an alpha faded icon -- paint with mouse testwm Test window manager -- title, icon, events threadwin Test multi-threaded event handling testgl A very simple example of using OpenGL with SDL testjoystick List joysticks and watch joystick events