Dne 2016-05-02 16:53, Jerome Leclanche napsal: > On Mon, May 2, 2016 at 5:06 PM, Arun Raghavan <arun at accosted.net> > wrote: >> On 1 May 2016 at 08:07, <mudrunka at spoje.net> 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 >> _______________________________________________ >> pulseaudio-discuss mailing list >> pulseaudio-discuss at lists.freedesktop.org >> https://lists.freedesktop.org/mailman/listinfo/pulseaudio-discuss > > 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 > _______________________________________________ > pulseaudio-discuss mailing list > pulseaudio-discuss at lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/pulseaudio-discuss
