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when the stream is muted (due to the configuration, or
due to a HAL request), the read/write loop is stopped.
The benefit is that muting will work with capture devices
that do not implement the mute in their driver.
The inconvenient of stopping the read loop is that it
has made appear an unexpected side-effect: the poll on
capture does not trig for further incoming frames.
The workaround is to completely close, then reopen
and configure the capture PCM.
Signed-off-by: Thierry Bultel <thierry.bultel@iot.bzh>
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- removed the systemd polling usage
- uses a while loop for reading
- improved the write loop, leveraging the available space
at each iteration
Signed-off-by: Thierry Bultel <thierry.bultel@iot.bzh>
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This fixes the numerous XRUN issues seen on some cards.
The trick is to set the buffer_size & period size in
hw parameters. These ones are calculated from an expected
maximum latency.
Also, the writei is done in a loop to be robust to overruns
and partial writes.
Signed-off-by: Thierry Bultel <thierry.bultel@iot.bzh>
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Signed-off-by: Thierry Bultel <thierry.bultel@iot.bzh>
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Fixes the UNDERRUN issue (seen while playing radio, for instance)
Signed-off-by: Thierry Bultel <thierry.bultel@iot.bzh>
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Mixing with volume and mute per audio role works.
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