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Date: Sun, 18 Apr 2004 16:09:53 -0400 (EDT) From: David MacCormack Subject: [SDL] Linux joystick patch I recently got myself a PS2 -> USB converter (a super joybox 5). It accepts 4 PSX/PS2 controllers. It's implemented as a HID, which is nice because it doesn't require its own driver, but the problem is that it's implemented as a *single* HID -- that is, it shows up as a single joystick with 19 axes, 4 hats, and 48 buttons. This poses a problem for a number of apps which use SDL (stella, fce ultra, zsnes, to name a few) and see only a single (physical) joystick even though there are really 4 (logical) joysticks. There are a number of these types of devices on the market, and I've seen others post messages (in the zsnes forum, for example) with the same problem, so I came up with what I think is a pretty generic solution. I patched src/joystick/linux/SDL_sysjoystic.c to include support for logical joysticks; basically, it's a static array and supporting functions that map a single physical joystick to multiple logical joysticks. The attached patch has the new code. It's wrapped inside #ifndef statements so that you can get the old behavior if you want.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 16 May 2004 18:46:24 +0000
parents 355632dca928
children
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>SDL_BuildAudioCVT</H1
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><H2
>Name</H2
>SDL_BuildAudioCVT&nbsp;--&nbsp;Initializes a SDL_AudioCVT structure for conversion</DIV
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>Synopsis</H2
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><P
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><PRE
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>#include "SDL.h"</PRE
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><CODE
><CODE
CLASS="FUNCDEF"
>int <B
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>SDL_BuildAudioCVT</B
></CODE
>(SDL_AudioCVT *cvt, Uint16 src_format, Uint8 src_channels, int src_rate, Uint16 dst_format, Uint8 dst_channels, int dst_rate);</CODE
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>Before an <A
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> structure can be used to convert audio data it must be initialized with source and destination information. </P
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><I
>src_format</I
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> and <TT
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>dst_format</I
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> are the source and destination format of the conversion. (For information on audio formats see <A
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> SDL_AudioSpec</SPAN
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>). <TT
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>src_channels</I
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> and <TT
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>dst_channels</I
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> are the number of channels in the source and destination formats. Finally, <TT
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>src_rate</I
></TT
> and <TT
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><I
>dst_rate</I
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> are the frequency or samples-per-second of the source and destination formats. Once again, see <A
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>SDL_AudioSpec</SPAN
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><H2
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>Returns <SPAN
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>-1</SPAN
> if the filter could not be built or 1 if it could.</P
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>See <A
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>SDL_ConvertAudio</TT
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