From: Pannaga Bhushan <bhushan@multitech.co.in>
To: "alsa-devel@lists.sourceforge.net" <alsa-devel@lists.sourceforge.net>
Subject: pcm_lib.c . how does delta show wrong int. ack?
Date: Mon, 21 Oct 2002 09:21:16 +0530 [thread overview]
Message-ID: <3DB379B4.762BC79E@multitech.co.in> (raw)
Hi all,
In the file pcm_lib.c and in the funtion -
snd_pcm_hw_ptr_interrupt() , there are the following lines --
-----------------
delta = hw_ptr_interrupt - new_hw_ptr;
if(delta > 0) {
if( delta < runtime->buffer_size / 2) {
snd_printd("Unexpected hw_pointer value .... wrong interrupt
acknowledge?\n"...);
return 0;
}
runtime->hw_ptr_base += runtime->buffer_size;
-------
------
-------
}
-----------------
Can you pls clarify what these lines are doing? what is the significance
of delta and the significance of delta > 0 but less than
runtime->buffer_size/2 being a case of wrong interrupt ack.
thanx in advance,
Pannaga Bhushan
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reply other threads:[~2002-10-21 3:51 UTC|newest]
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