Record from bluetooth device(android-phone) via a2dp about bluez-alsa

[mirandw]

Also I tried bluealsa-aplay, still cannot work properly, lost
bluealsa-aplay C4:07:2F:96:FD:4D --verbose

Selected configuration:
HCI device: hci0
PCM device: default
PCM buffer time: 500000 us
PCM period time: 100000 us
Bluetooth device: C4:07:2F:96:FD:4D
Profile: A2DP
/usr/bin/bluealsa-aplay: ../../../utils/../src/shared/ctl-client.c:102: Connecting to socket: /var/run/bluealsa/hci0
bluealsa: ../../../src/ctl.c:544: New client accepted: 10
bluealsa: ../../../src/ctl.c:547: +-+-
/usr/bin/bluealsa-aplay: ../../../utils/../src/shared/ctl-client.c:197: Getting transport for C4:07:2F:96:FD:4D type 1
bluealsa: ../../../src/ctl.c:547: +-+-
/usr/bin/bluealsa-aplay: Couldn't set HW parameters: Invalid argument
bluealsa: ../../../src/ctl.c:515: Client closed connection: 10
bluealsa: ../../../src/ctl.c:547: +-+-

[mirandw]

I have found rootcuase of arecord: pcm_read:2031: read error: No such device
It is all my fault when modifying eventfd_read/eventfd_write

[mirandw]

bluealsa-aplay C4:07:2F:96:FD:4D --verbose
This issue is because when setting pcm set_hw_params, alsalib-1.0.2 must set period-time first, then buffer-time, otherwse, Invalid argument appears.
This issue's done for me now. Thanks.

[arkq]

Thx for the explanation. I'll reverse these hw_params_set_* calls. :)

[arkq]

Are you sure, that the cause of the "Invalid argument" error was the order of set_hw_params calls? I've checked this with various versions of alsa-lib (as old as 0.9.8) and in every case the order is of no importance. Maybe the problem was with something else, e.g. unsupported number of channels or some other incompatibility...

I'll change a little bit error reporting, because right now this set HW params error message does not say much :/

[mirandw]

sorry, I reversed the order in arecord built from alsa-utils, everything is ok. But indeed, after reversing order, bluealsa-aplay works fine. And the params is as expected.
#bluealsa-aplay --hci=hci0 --pcm=hw:0,1 C4:07:2F:96:FD:4D --pcm-period-time=125000 --pcm-buffer-time=500000
bluealsa-aplay: channels 1 rate 44100 buffer 500000 period 125000

Maybe some other incompatibility exists. I'll keep on debuging.

Sorry for the trouble :)