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Date: Sun, 4 Jan 2004 23:48:19 +0100 From: Max Horn Subject: Re: Again Audio CD patch Am 04.01.2004 um 22:38 schrieb Sam Lantinga: > > Okay, I fixed the buffering problems by simply using a 4 second buffer > instead of a 1 second buffer. However, using your code I can't play an > entire CD - the playback stops after the first song. > Found the problem: FSReadFork returns eofErr when the file is finished. However, we check its return value for errors, and if anything but noErr occurs, the reader thread aborts its current iteration. That is bad, because it aborts before it can ever set the flag which tells that the file is over (also, any remaining data which FSRead did return is lost - so you'd not hear about to 4 seconds from the end of the file. Furthermore, the computed data size was 8 bytes to high (I forgot to account for the fact that the size of an (A)IFF chunk always contains the chunk header & size fields, too). This is enough to make it work. However, the end condition is rather fragile, so I tuned some other things to be pessimistic (check for <= 0 instead of == 0, when eofErr is encountered enforce mReadFilePosition == mFileLength). You never know... The attached patch fixes the issue for me.
author Sam Lantinga <slouken@libsdl.org>
date Mon, 05 Jan 2004 00:57:51 +0000
parents e5bc29de3f0a
children 355632dca928
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<HTML
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>SDL_PumpEvents</TITLE
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><DIV
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><H2
>Name</H2
>SDL_PumpEvents&nbsp;--&nbsp;Pumps the event loop, gathering events from the input devices.</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
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><H2
>Synopsis</H2
><DIV
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><P
></P
><PRE
CLASS="FUNCSYNOPSISINFO"
>#include "SDL.h"</PRE
><P
><CODE
><CODE
CLASS="FUNCDEF"
>void <B
CLASS="FSFUNC"
>SDL_PumpEvents</B
></CODE
>(void);</CODE
></P
><P
></P
></DIV
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><DIV
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><A
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><H2
>Description</H2
><P
>Pumps the event loop, gathering events from the input devices.</P
><P
><TT
CLASS="FUNCTION"
>SDL_PumpEvents</TT
> gathers all the pending input information from devices and places it on the event queue. Without calls to <TT
CLASS="FUNCTION"
>SDL_PumpEvents</TT
> no events would ever be placed on the queue. Often calls the need for <TT
CLASS="FUNCTION"
>SDL_PumpEvents</TT
> is hidden from the user since <A
HREF="sdlpollevent.html"
><TT
CLASS="FUNCTION"
>SDL_PollEvent</TT
></A
> and <A
HREF="sdlwaitevent.html"
><TT
CLASS="FUNCTION"
>SDL_WaitEvent</TT
></A
> implicitly call <TT
CLASS="FUNCTION"
>SDL_PumpEvents</TT
>. However, if you are not polling or waiting for events (e.g. your filtering them), then you must call <TT
CLASS="FUNCTION"
>SDL_PumpEvents</TT
> to force an event queue update.</P
><DIV
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><BLOCKQUOTE
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><P
><B
>Note: </B
>You can only call this function in the thread that set the video mode.</P
></BLOCKQUOTE
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>SDL_PollEvent</TT
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