unable to configure bluealsa-aplay to properly stereo

[viktory36]

hey, i've wired a 3.5mm left/right splitter to 2 speakers on my pi, and set everything up as in the readme. I'm unable to play anything through bluetooth where the 2 channels are clearly separate - for example when only right channel is supposed to sound, i hear sound thru both speakers, but the right one is louder, and vice versa. when i play a file with aplay 2channeltest.wav or speaker-test -c 2, it sounds correct - when left channel is supposed to sound the right speaker doesn't do anything as desired.

please nelp me config my setup correctly to work in bluetooth? issue persists on ldac/aac/sbc

[viktory36]

sharing some logs,

pi@raspberrypi:~ $ bluealsa-aplay --mixer-name=PCM -v
bluealsa-aplay: [893] I: ../../../utils/aplay/aplay.c:1151: Selected configuration:
  BlueALSA service: org.bluealsa
  ALSA PCM device: default
  ALSA PCM buffer time: 500000 us
  ALSA PCM period time: 100000 us
  ALSA mixer device: default
  ALSA mixer element: 'PCM',0
  Bluetooth device(s): ANY
  Profile: A2DP
bluealsa-aplay: [893] D: ../../../utils/aplay/aplay.c:846: Creating IO worker 18:4E:16:77:27:C6
bluealsa-aplay: [893] D: ../../../utils/aplay/aplay.c:1194: Starting main loop
bluealsa-aplay: [894] D: ../../../utils/aplay/aplay.c:514: Opening BlueALSA source PCM: /org/bluealsa/hci0/dev_18_4E_16_77_27_C6/a2dpsnk/source
bluealsa-aplay: [894] D: ../../../utils/aplay/aplay.c:540: Starting IO loop
bluealsa-aplay: [894] D: ../../../utils/aplay/aplay.c:664: Opening ALSA playback PCM: name=default channels=2 rate=96000
bluealsa-aplay: [894] D: ../../../utils/aplay/aplay.c:679: Opening ALSA mixer: name=default elem=PCM index=0
bluealsa-aplay: [894] D: ../../../utils/aplay/aplay.c:578: BT device marked as inactive: 18:4E:16:77:27:C6
bluealsa-aplay: [894] D: ../../../utils/aplay/aplay.c:664: Opening ALSA playback PCM: name=default channels=2 rate=96000
bluealsa-aplay: [894] D: ../../../utils/aplay/aplay.c:679: Opening ALSA mixer: name=default elem=PCM index=0
bluealsa-aplay: [894] D: ../../../utils/aplay/aplay.c:578: BT device marked as inactive: 18:4E:16:77:27:C6
...

pi@raspberrypi:~ $ cat /etc/asound.conf
pcm.!default {
        type hw
        card 1
}

ctl.!default {
        type hw
        card 1
}

pi@raspberrypi:~ $ amixer scontents
Simple mixer control 'PCM',0
  Capabilities: pvolume pswitch pswitch-joined
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 15
  Mono:
  Front Left: Playback 15 [100%] [0.00dB] [on]
  Front Right: Playback 15 [100%] [0.00dB] [on]
pi@raspberrypi:~ $ amixer scontrols
Simple mixer control 'PCM',0

hardware: pi -> usb dac (card 1) -> 3.5mm left/right splitter -> 2 portable speakers

with all config items looking okay, and playing the same left/right test audio wav file thru aplay and then over samsung bluetooth, I'm convinced something is going wrong while keeping the channels separate over bluetooth here.

but im happy to be proven wrong!!

[anonymix007]

This is not libldacdec issue if it persists on AAC and SBC as well. You can report it to bluez-alsa.

[viktory36]

So this was happening because of my samsung's dolby atmos, and my poweramp's "stereo expand". Had to switch them off.

:)