[arm-allstar] software update status

[LaRoy McCann]

David,
I am curious as to why I only notice this audio problem on the Pi2 and 
not the BBB.

I have a repeater running on each the Pi2 and the BBB and only the Pi2 
repeater has this issue.
These two repeaters are linked together thru a wireless link full time.
I know there is a slight delay on the BBB from input audio to output 
audio, but I have never been able to un-key fast enough to hear myself 
on the BBB.

Just seems odd that a faster processor has the problems.
I know the processor is a multi-core processor but my guess is that 
everything still runs on one core and that one core is slower than the BBB.

73's
LaRoy, K5TW

On 9/1/2015 1:24 AM, David McGough wrote:
> Hi Bob,
>
> The variable audio delay issue is occasionally seen on PC-computer
> platforms, too, particularly with the simpleusb driver. This is NOT the
> audio delay that is unavoidable due to buffering as the audio samples pass
> through Asterisk. Nor is this issue related to the Asterisk jitter buffer,
> etc.
>
> Basically stated, the problem is that the input sample rate -dynamically-
> varies from the output sample rate. Depending on various factors, you may
> have too many samples, or too few, at any given moment. With the current
> code, the main issue seen is that too many output sound frames get queued,
> causing a frequently increasing in length input to output audio
> delay--sometimes with delays of maybe as much as one second (really
> annoying!). If there is an output buffer under-run, you hear a pop/click
> due to running out of samples.
>
> Initially, I suspected some kind of subtle bug in the simpleusb sound
> code. But, after experimentation, I've been able to easily duplicate this
> issue using my native ALSA stand-alone test software or even ALSA
> applications like arecord and aplay, etc.
>
> One solution to this problem is to use a dynamic buffer that effectively
> re-samples the audio, gently up-sampling or down-sampling, depending on
> the current trends for overrun or under-run.  I've got working software
> that accomplishes this now. And, it runs full-duplex beautifully for 24+
> hours with no change in audio delay and no logged clicks or pops.
>
> Hopefully, I'll get a few days time when I'm rested to focus on completing
> the integration of this code into simpleusb.  So far, I've had no time at
> all to complete this.
>
> But, hopefully soon.
>
> 73, David KB4FXC
>
>
>
> On Mon, 31 Aug 2015, kk6ecm wrote:
>
>> Couple of questions:
>>
>> 1) Is this audio delay the same as experienced with ACID?
>>
>> 2) What is the nature of the fix that reduces the delay?
>>
>> Thanks,
>> Bob
>> kk6ecm
>>
>> Sent from iPad
>>
>>
>>> On Aug 27, 2015, at 9:33 AM, David McGough <kb4fxc at inttek.net> wrote:
>>>
>>>
>>> Hi LaRoy,
>>>
>>> Progress has been slow in recent weeks, due primarily to family
>>> commitments that I've got. At this point, the update is waiting on me.
>>>
>>> I am hopeful to minimally have a bug-fix interim release soon. The big
>>> item on the list being resolution for the variable audio delay.
>>>
>>> I hope to have more details soon.
>>>
>>>
>>> 73, David KB4FXC
>>>
>>>
>>>
>>>> On Thu, 27 Aug 2015, LaRoy McCann wrote:
>>>>
>>>> Doug,
>>>> Just curious on how things are progressing with a new software update
>>>> for the PI2?
>>>>
>>>> Thanks,
>>>>
>>>> LaRoy McCann, K5TW
>>>>
>>>>
>>>>
>>>>
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