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
