Ok, i've filled bug: https://bugs.freedesktop.org/show_bug.cgi?id=95411 Dne 2016-05-02 22:13, mudrunka at spoje.net napsal: > 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 > > _______________________________________________ > pulseaudio-discuss mailing list > pulseaudio-discuss at lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/pulseaudio-discuss
