Re: IOAudioStream clipIfNecessary messages
Re: IOAudioStream clipIfNecessary messages
- Subject: Re: IOAudioStream clipIfNecessary messages
- From: Jeff Moore <email@hidden>
- Date: Wed, 25 Aug 2010 09:43:02 -0700
Those messages mean is that a client wrote to the driver at a spot that the family wasn't expecting. In this case, the client is wrote a little further in the future than the family expected. Usually, this just means that the client skipped some samples, probably due to an overload or some other thing that caused IO to skip some samples.
The log message about this is probably unnecessary and should probably be relegated to debug builds. Feel free to file a bug about it.
--
Jeff Moore
Core Audio
Apple
On Aug 25, 2010, at 8:49 AM, B.J. Buchalter wrote:
> What does it mean when IOAudioStream::clipIfNecessary logs "Error: attempting to clip..." messages to the system/kernel.log?
>
> For example:
>
> 8/25/10 8:45:15 AM kernel IOAudioStream[0xdcd3300]::clipIfNecessary() - Error: attempting to clip to a position more than one buffer ahead of last clip position (6aa6,43a)->(6aa7,4d0).
> 8/25/10 8:45:15 AM kernel IOAudioStream[0xdcd3300]::clipIfNecessary() - adjusting clipped position to (6aa7,43a)
> 8/25/10 8:45:15 AM kernel IOAudioStream[0xdcd3200]::clipIfNecessary() - Error: attempting to clip to a position more than one buffer ahead of last clip position (6aa6,43a)->(6aa7,4d0).
> 8/25/10 8:45:15 AM kernel IOAudioStream[0xdcd3200]::clipIfNecessary() - adjusting clipped position to (6aa7,43a)
>
> Is this something that can be caused by the driver, or is it causes by the HAL or the HAL client failing to call into the driver in a timely fashion?
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