[pulseaudio-discuss] Overrun in Pulseaudio8.0 when switching endpoints

[Nishit Sharma]

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>> When PulseAudio boots up it initializes AMIC (
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> Headset ) only and i can record using it.
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>  Now, the problem starts. When i plugged Headset the Port switching done
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>  from AMIC to DMIC and after sometime i got overrun without recording
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>  anything.
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>>  You seem to be saying that AMIC is the same thing as Headset
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>>   *Yes AMIC is detected as HeadSet when executed pulseaudio*
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>> but then you say that when the headset is plugged in, the port changes
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>>  from AMIC
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>  to DMIC, which doesn't make sense.
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>>   * I missed one thing, when i plugged out Headset from target board,
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>  pulseaudio switches port from AMIC to DMIC*
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>  *    which i think should initializes ( hw params ) DMIC first as done for
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>  AMIC??*
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>> No, hw params are not reconfigured. Only mixer settings are changed
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> according to the UCM configuration.
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>>  My analysis:- PulseAudio should initialize both AMIC and DMIC ( setting
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>  hw params and other stuff ) but only AMIC initialized. Only port switching
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>  should not have been happened as no hw params setup for DMIC. Port
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>  switched but PulseAudio is expecting I/P for AMIC. Am i right here?
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>>  Hw params are set when opening the PCM device. If AMIC and DMIC are on
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>  the same PCM device, there's no need to reconfigure the hw params (or
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>  if the hardware requires such reconfiguration, pulseaudio certainly
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>  won't do it). It's a bit unclear unclear whether AMIC and DMIC are on
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>  same or different PCM devices, but if they are two ports on the same
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>  sink, then they are on the same PCM device.
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>>    If it is so then DMIC will be accepting HW params which were set for
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>  AMIC ( HeadSet ), but then there will be difference between the period
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>  size, buffer size passed to DMIC sink which **again can cause problem? *
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>> Why would there be a difference in the buffer parameters? Since we
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> don't reconfigure the hw params, it's clear that there will be no
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> difference.
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>> If you actually want different buffering parameters depending on the
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> active port, that's not supported in pulseaudio.
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>      *  Is there any workaround to close device/stream and open new
device/stream when switching from AMIC to DMIC??*
*       I mean, When AMIC plugged out the device/stream should be closed
and opens new device/stream for DMIC as pulseaudio did for AMIC. Instead of
switching only port, DMIC              Initailzation happens as done for
AMIC*

>
>> Regards
>
>        Nishit

> --
>
> Tanu
>
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