a2dp_aptx.c: Error submitting the packet to the decoder

[ehfive]

a2dp_aptx.c: Error submitting the packet to the decoder

[EHfive]

Looks like it's mine personal issue because of 3rd-party aptx libs, isn't ?

It might be.

Actually the same error "Synchronization error" printed when I use https://github.com/Magisk-Modules-Repo/aptx on my Oneplus 2, LineageOS 16; But without any issue on my Oneplus 6t which has official aptX/aptX HD support.

Look into ffmpeg aptX source, "Synchronization error" stands for a bad aptx frames data.

The 3rd-party libs might don't have ability to handle UI tones that break aptx frames data.

[EHfive]

I have pushed bff80fd

That might fix this issue

[xstsx]

First of all thanks for fast response, and fix. Trying it out.
No more errors with playing music/video for now.
Still problems with music/video , every videos from this playlist is starting with errors, after 3-5 repeats of pause/play it's starting to play. If it had to pause at some point and rebuff - again errors.

The only way to "fix": pause, wait for all error messages printed out, play music. If there is more errors - repeat.

But..

[aptx_hd @ 0x5567b5358680] Synchronization error
D: [bluetooth] a2dp_aptx.c: Error submitting the packet to the decoder

Appears at UI "clicks", at DTMF tones when trying to dial number, at Volume up/down sounds, Power on/ off screen. Lets say all UI sounds is producing this error.

A little overpass for me now it's to mute UI sounds :)
Looks like it's mine personal issue because of 3rd-party aptx libs, isn't ?

[xstsx]

Indeed, tried another lib. And it's working like yours.
Some random Sync errors ,at least it doesn't "stuck" on it.
I got everything work, UI sounds, video and audio on Raspberry PI.

Thank you very much ;)

[gpeter12]

Hi!
I have the exact same issue. I'm also trying to use a Raspberry Pi for bluetooth sink with aptX-HD. I'm getting a lot of Synchronization error.

[aptx_hd @ 0x1444c70] Synchronization error
[aptx_hd @ 0x1444c70] Synchronization error
[aptx_hd @ 0x1444c70] Synchronization error
[aptx_hd @ 0x1444c70] Synchronization error
[aptx_hd @ 0x1444c70] Synchronization error
[aptx_hd @ 0x1444c70] Synchronization error
I: [alsa-sink-bcm2835 ALSA] module-loopback.c: Could not peek into queue
I: [alsa-sink-bcm2835 ALSA] module-loopback.c: Could not peek into queue
[aptx_hd @ 0x1444c70] Synchronization error
I: [alsa-sink-bcm2835 ALSA] module-loopback.c: Could not peek into queue
[aptx_hd @ 0x1444c70] Synchronization error
[aptx_hd @ 0x1444c70] Synchronization error
I: [alsa-sink-bcm2835 ALSA] module-loopback.c: Could not peek into queue
[aptx_hd @ 0x1444c70] Synchronization error
I: [alsa-sink-bcm2835 ALSA] module-loopback.c: Could not peek into queue

The most interesting thing is that on my laptop (also as a sink) with the same code and with (almost) the same libavcodec version it works just perfectly fine. With ZERO error messages in the log.

I suspect that the error message comes from the 1039. line of libavcodec's aptx.c. But I assume the problem isn't in libavcodec.

I would really really appreciate the help because I spent almost 3 days on this issue already. It would be a waste...

My setup:

• Asus Zenfone 5Z (it has official support for AptX-HD and AAC)
  • Android 9
  • Bluetooth 5.0
• Raspberry Pi 3 B (with official PSU)
  • Bluetooth 4.1
• Laptop: Asus N550JK (Intel Core I7 4700HQ version)
  • Ubuntu 19.04
  • Bluetooth 4.0
• libavcodec-dev:armhf (7:4.1.4-1+rpt1~deb10u1)
• pulseaudio-modules-bt version is the currently most recent 3ecf1d7
• pulseaudio version is pulseaudio 12.2-dirty (git: ee910cf6d) (because with the current master I couldn't get it work at all)

[xstsx]

I think I found the solution: https://hackaday.io/project/165208-an-old-rotary-phone-as-bluetooth-set/log/162491-setting-up-the-bluetooth

changing imtu making it more stable. no more Sync errors when changing tracks.

[EHfive]

75af499 enable autodetect_mtu by default, hope it helps

[xstsx]

75af499 enable autodetect_mtu by default, hope it helps

Thank you for quick response :)

I would say it's working, but only for playing music when you stays only at APTX-HD profile(+notifications sound)

But if you receive call ,profile changing to HSP/HFP. After a call it's trying to switch back to APTX-HD and then it's falling to alot of Sync errors.

Overall playing music over APTX-HD became more stable, no more skips/silence/hanging up. Overall playback latency stable at 195-200ms (before it was very random 180-500ms)

I will continue trying figure out this behavior and what making it. Maybe it's my personal issue :)

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[EHfive]

Maybe it can be fixed by switching to libopenaptx.

[EHfive]

This project has been deprecated. #154

There will be no bug fixing commits anymore.