Dne 2016-05-02 16:53, Jerome Leclanche napsal:
On Mon, May 2, 2016 at 5:06 PM, Arun Raghavan <[email protected]>
wrote:
On 1 May 2016 at 08:07, <[email protected]> wrote:
Hello,
i have issue with bluetooth speaker. it creates loud pop when it's
(un)suspended by module-suspend-on-idle. so i proceeded to disable
suspend-on-idle, but when i leave it on for few hours, the latency
gets
huge. Like 2 seconds or more. I suppose it has something to do with
DAC
clock (or samplerate) in bluetooth speakers being little bit slower
than
nominal. And the error adds up over time resulting in growing
latency.
When i manualy reconnect to speaker it gets fixed.
Do you have any idea how to fix this? I think it needs something that
will
reset the stream when no audio is played, pretty much like
suspend-on-idle
does, but without powering the bt device off (which causes pop). it's
really
annoying. sometimes it scares the crap out of me, when speakers are
on full
volume and it pops when i eg. receive IM mesage. :-) also it's
probably not
healthy for the speakers (i use conventional speakers with amp and bt
receiver).
I know the popping is mostly HW error. But it can be worked around by
disabling suspend-on-idle, which then causes latency problems (also
somehow
HW related). And i think the latency problem can be somehow fixed in
SW by
restarting the stream or cleaning some buffer that causes the
latency...
BTW 2 seconds of latency are quite a lot... Is there even chance,
that cheap
BT device has 2 second buffer? Maybe it's pulse audio that has 2
second
latency. And it would be easily fixed by not buffering silence. Or by
deleting this buffer when idle.
That does sound like a large latency. Could you file a bug about that,
and hopefully I'll get some time to test this out to see if it happens
locally too? If we do fix that, it looks like your problem should just
be fixed.
Cheers,
Arun
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I missed that original email, but this is something that's familiar to
me.
I've been able to reproduce this exact issue very easily on the
bluetooth Parrot Zik and Parrot Zik 2 models with my btusb receiver by
running out of range of the receiver.
When out of range, a popping sound can be heard while the sound cuts
for a few milliseconds, and the sound then resumes where it initially
left off, creating a latency buffer which keeps growing every time the
headset goes out of range again.
The buffer resets when the card profile is turned off and back on (eg.
pactl set-card-profile bluez_card.... off && pactl set-card-profile
bluez_card.... a2dp_sink).
Worth noting the issue does not happen on the Parrot Zik 3, which is
compatible with Bluetooth 4.x (unlike the versions 1 and 2).
J. Leclanche
So do you think it will be possible to easily fix this in software for
BT 2?
I think you are true that it's related to the signal. I think i've
noticed it gets worse during signal disturbances...
Tomas
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