Plugz, a2dpd, and a2dpd2 strangeness

With the amount of experimentation I've done in the past couple of days it's hard to figure out what information is relevant. I'll try to boil it down:

I couldn't get btsco to work, though a2play did.

With pcm_a2dpd I get occasional (~one every two minutes) chirps out of the headphones, mainly when interrupting ogg123 (aplay, whatever). hcidump -X -V shows no traffic except briefly when those chirps occur. Sound is fine through the alsa redirect.

With pcm_a2dpd2 I have jumpy, very sped up sound from the headphones and plenty of traffic through hcidump. Alsa redirect sounds about the same as the headphones, but the daemon gives the following errors:

A2DPD[21:11:15.563]: alsa_transfer_raw: (errno=32:Broken pipe)EPIPE(-32) A2DPD[21:11:15.983]: append_to_ring_buffer: Ring buffer is full A2DPD[21:11:15.983]: append_to_ring_buffer: Ring buffer is full A2DPD[21:11:15.986]: append_to_ring_buffer: Ring buffer is full

and on, filling the screen with the full buffer messages.

I suppose that basically describes the situation. The rest is background. I'm willing to do whatever I can to help, but as my C is rusty I figure it's time to ask the devs.

~Chris

Background:
I followed the build instructions and troubleshooting for Plugz at bluetooth-alsa.sf.net. Everything went without a hitch as far as I can see.

I have a pair of Creative CB2530 headphones. I've tried them with four different bluetooth dongles including both Broadcom and CSR (currently a DLink DBT-120). There were no differences between dongles. Connecting is never problematic at all.

This is Gentoo with Bluez 3.9 and kernel 2.6.20 with the sco patches.

carlin1 ~ # hciconfig -a
hci0: Type: USB

         BD Address: 00:17:9A:2B:73:53 ACL MTU: 384:8 SCO MTU: 64:8
         UP RUNNING PSCAN
         RX bytes:989913 acl:63621 sco:0 events:13344 errors:0
         TX bytes:7630626 acl:24367 sco:0 commands:67 errors:0
         Features: 0xff 0xff 0x8f 0xfe 0x9b 0xf9 0x00 0x80
         Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3
         Link policy: RSWITCH HOLD SNIFF PARK
         Link mode: SLAVE ACCEPT
         Name: 'BlueZ (0)'
         Class: 0x3e0100
         Service Classes: Networking, Rendering, Capturing, Object 

Transfer, Audio
Device Class: Computer, Uncategorized
HCI Ver: 2.0 (0x3) HCI Rev: 0x77b LMP Ver: 2.0 (0x3) LMP
Subver: 0x77b
Manufacturer: Cambridge Silicon Radio (10)

carlin1 ~ # hcitool info 00:0D:E8:01:BB:A3
Requesting information ...

         BD Address:  00:0D:E8:01:BB:A3
         Device Name: CB2530
         LMP Version: 1.2 (0x2) LMP Subversion: 0x3d
         Manufacturer: Zeevo, Inc. (18)
         Features: 0xff 0xff 0x05 0x78 0x18 0x18 0x00 0x80
                 <3-slot packets> <5-slot packets> <encryption> <slot 

offset>
<timing accuracy> <role switch> <hold mode> <sniff mode> <park state> <RSSI> <channel quality> <SCO link> <HV2
packets>
<HV3 packets> <u-law log> <A-law log> <CVSD> <power
control>
<enhanced iscan> <interlaced iscan> <interlaced pscan> <inquiry with RSSI> <AFH cap. slave> <AFH class. slave> <AFH cap. master> <AFH class. master> <extended features>

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Chris

I'm not following you here. What's the difference between using pcm_a2dpd2 and the "alsa redirect"? I didn't catch what "same as the headphones" was referring to either.

Brad

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Brad,

Chris

I understand you have sound through alsa but not through a2dp, and only occasional chirps? What headset/adapter is it? Did you start hcidump before a2dpd?
Make sure to use 44100hz 16bits samples.
I need the full a2dpd -g output or enabledebug=1 in a2dprc to help more. Use pcm_a2dpd if it gives good result through alsa.

Frederic

-------- Message d'origine--------
De: [email protected] de la part de Brad Midgley
Date: ven. 27/04/2007 06:03
À: BlueZ development
Objet : Re: [Bluez-devel] Plugz, a2dpd, and a2dpd2 strangeness

Chris

I'm not following you here. What's the difference between using pcm_a2dpd2 and the "alsa redirect"? I didn't catch what "same as the headphones" was referring to either.

Brad

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carlin1 ~ # a2dpd -g
A2DPD[10:29:49.541]: init_ipc: Selected IPC: unix, addr=127.0.0.1, bcst=127.0.0.255, port=21453
A2DPD[10:29:49.541]: make_daemon_process: a2dpd [Apr 26 2007 17:07:32] starting ...
A2DPD[10:29:49.541]: main: (errno=9:Bad file descriptor)a2dpd addr=00:0D:E8:01:BB:A3 timer=999 us [Apr 26 2007 17:07:37] A2DPD[10:29:49.541]: a2dpd_signal_init: Getting on DBUS A2DPD[10:29:49.542]: a2dpd_signal_init: Installing watch A2DPD[10:29:49.542]: add_dbus_watch: Added watch 0 0x809b8b8 disabled A2DPD[10:29:49.542]: add_dbus_watch: Added watch 1 0x809b8e0 enabled A2DPD[10:29:49.542]: a2dpd_signal_init: Registering object path:
/com/access/a2dpd
A2DPD[10:29:49.542]: a2dpd_signal_init: Acquiring service: com.access.a2dpd A2DPD[10:29:49.542]: a2dpd_signal_init: OK
A2DPD[10:29:49.542]: a2dpd_signal_init: OK
A2DPD[10:29:49.542]: a2dpd_register_sdp: OK A2DPD[10:29:49.542]: add_avrtg:
A2DPD[10:29:49.542]: add_a2source:
A2DPD[10:29:49.542]: main_loop:
A2DPD[10:29:49.542]: make_server_socket:
A2DPD[10:29:49.542]: bta2dpdevicenew:
A2DPD[10:29:49.542]: a2dpd_signal_address_changed: 00:0D:E8:01:BB:A3 A2DPD[10:29:49.543]: a2dpd_signal_set_socket: Signal socket set to 7 A2DPD[10:29:49.543]: a2dpd_signal_state: Disconnected A2DPD[10:29:49.543]: a2dp_alloc:
A2DPD[10:29:49.543]: a2dp_alloc: (a2dp = 0x80a9290) A2DPD[10:29:49.543]: a2dp_new: 00:0D:E8:01:BB:A3, 32000 A2DPD[10:29:49.543]: a2dp_new: State AVDTP_STATE_DISCONNECTED A2DPD[10:29:49.543]: alsa_new:
A2DPD[10:29:49.543]: alsa_new: device=plughw:0,0, framerate=32000 A2DPD[10:29:49.543]: alsa_new: State ALSA_STATE_DISCONNECTED A2DPD[10:29:49.543]: alsa_new: returning 0x80ab418 A2DPD[10:29:49.543]: sco_new:
A2DPD[10:29:49.543]: sco_new: State SCO_STATE_DISCONNECTED A2DPD[10:29:49.543]: sco_state_disconnect: Filtering state : already disconnected
A2DPD[10:29:49.543]: main_loop: Bluetooth Device Settings [32000 hz, 2 channels, 16 bits]
A2DPD[10:29:49.544]: avrcp_new: Listening for AVRCP on socket 9 A2DPD[10:29:49.544]: avrcp_new: 0x80ab528

***hit play***

A2DPD[10:29:53.502]: pollfd_cb_sockfd: Client 10 got index 0 A2DPD[10:29:53.502]: stream_client_state_streamingsetup: PLAYBACK thread client_index=0, socket=10, id=0 started (44100 Hz, 2 channels, 16 bits) A2DPD[10:29:53.503]: a2dp_state_connect: State AVDTP_STATEX_SDP_CONNECTING A2DPD[10:29:53.503]: a2dp_state_machine: Role is INITIATOR A2DPD[10:29:53.503]: a2dp_state_machine: (errno=115:Operation now in progress)SDP connection on socket 11
A2DPD[10:29:53.503]: a2dp_state_machine: State AVDTP_STATEX_SDP_CONNECTING_WAIT
A2DPD[10:29:53.503]: a2dpd_signal_state: Connecting 00:0D:E8:01:BB:A3 A2DPD[10:29:56.722]: a2dp_state_machine: SDP connection terminated A2DPD[10:29:56.744]: get_avdtp_psm: Parsing results A2DPD[10:29:56.744]: get_avdtp_psm: Record
A2DPD[10:29:56.744]: get_avdtp_psm: Service Search OK A2DPD[10:29:56.761]: get_avdtp_psm: Checking non spec audio A2DPD[10:29:56.761]: a2dp_state_machine: Found psm 25 A2DPD[10:29:56.761]: a2dp_state_machine: State AVDTP_STATEX_CTL_CONNECTING A2DPD[10:29:56.761]: a2dp_state_machine: Socket is 11 A2DPD[10:29:56.761]: a2dp_state_machine: (errno=115:Operation now in progress)State AVDTP_STATEX_CTL_CONNECTING_WAIT A2DPD[10:29:56.784]: a2dp_state_machine: State AVDTP_STATE_IDLE A2DPD[10:29:56.785]: a2dp_state_machine: State AVDTP_STATEX_DISCOVERING A2DPD[10:29:56.786]: a2dp_state_machine: State AVDTP_STATEX_DISCOVERING_RESP A2DPD[10:29:56.800]: a2dp_handle_avdtp_message: Read non command packet (msgtype=MESSAGE_TYPE_ACCEPT,signal=AVDTP_DISCOVER) A2DPD[10:29:56.800]: a2dp_state_machine: AVDTP_DISCOVER success A2DPD[10:29:56.800]: a2dp_state_machine: State AVDTP_STATEX_GETTING_CAPABILITIES
A2DPD[10:29:56.801]: a2dp_state_machine: Getting capabilities for SEID=1 A2DPD[10:29:56.801]: a2dp_state_machine: State AVDTP_STATEX_GETTING_CAPABILITIES_RESP
A2DPD[10:29:56.812]: get_socket_omtu: Socket 9 imtu=672, omtu=0, flush_to=65535
A2DPD[10:29:56.812]: pollfd_cb_avrcpfd: socket 12: Connection from A3:BB:01:E8:0D:00, mtu=610 accepted at index 0 A2DPD[10:29:56.814]: a2dp_handle_avdtp_message: Read non command packet (msgtype=MESSAGE_TYPE_ACCEPT,signal=AVDTP_GET_CAPABILITIES) A2DPD[10:29:56.814]: a2dp_state_machine: AVDTP_GET_CAPABILITIES success for seid 1
A2DPD[10:29:56.814]: a2dp_state_machine: servcap_cap=1, servcap_len=0, A2DPD[10:29:56.814]: a2dp_state_machine: cap_type=7, length=6 A2DPD[10:29:56.814]: a2dp_state_machine: media_type=0, codec=0 A2DPD[10:29:56.814]: a2dp_state_machine: A2DPD Prefered bitpool 32 A2DPD[10:29:56.814]: a2dp_state_machine: Device Prefered bitpool 2 -> 250 A2DPD[10:29:56.814]: a2dp_state_machine: A2DPD Selected bitpool 32 A2DPD[10:29:56.814]: a2dp_state_machine: State AVDTP_STATEX_SETTING_CONFIGURATION
A2DPD[10:29:56.815]: a2dp_state_machine: State AVDTP_STATEX_SETTING_CONFIGURATION_RESP
A2DPD[10:29:56.834]: a2dp_handle_avdtp_message: Read non command packet (msgtype=MESSAGE_TYPE_ACCEPT,signal=AVDTP_SET_CONFIGURATION) A2DPD[10:29:56.834]: a2dp_state_machine: AVDTP_SET_CONFIGURATION success A2DPD[10:29:56.834]: a2dp_state_machine: State AVDTP_STATEX_STREAM_OPENING A2DPD[10:29:56.835]: a2dp_state_machine: State AVDTP_STATEX_STREAM_OPENING_RESP
A2DPD[10:29:56.851]: a2dp_handle_avdtp_message: Read non command packet (msgtype=MESSAGE_TYPE_ACCEPT,signal=AVDTP_OPEN) A2DPD[10:29:56.851]: a2dp_state_machine: AVDTP_OPEN success A2DPD[10:29:56.851]: a2dp_state_machine: State AVDTP_STATE_CONFIGURED A2DPD[10:29:56.852]: a2dp_state_machine: State AVDTP_STATEX_STREAM_CONNECTING
A2DPD[10:29:56.853]: a2dp_state_machine: Socket is 13 A2DPD[10:29:56.853]: a2dp_state_machine: (errno=115:Operation now in progress)State AVDTP_STATEX_STREAM_CONNECTING_WAIT A2DPD[10:29:56.884]: a2dp_state_machine: Stream connected A2DPD[10:29:56.884]: get_socket_omtu: Socket 13 imtu=672, omtu=678, flush_to=65535
A2DPD[10:29:56.884]: a2dp_state_machine: State AVDTP_STATE_OPEN_START_STREAMING
A2DPD[10:29:56.885]: a2dp_state_machine: State AVDTP_STATEX_STREAM_STARTING A2DPD[10:29:56.885]: a2dpd_signal_state: Connected 00:0D:E8:01:BB:A3 A2DPD[10:29:56.886]: a2dp_state_machine: State AVDTP_STATEX_STREAM_STARTING_WAIT
A2DPD[10:29:56.900]: a2dp_handle_avdtp_message: Read non command packet (msgtype=MESSAGE_TYPE_ACCEPT,signal=AVDTP_START) A2DPD[10:29:56.900]: a2dp_state_machine: AVDTP_START success A2DPD[10:29:56.900]: a2dp_state_machine: State AVDTP_STATE_STREAMING

***ogg123 says it's playing; no sound except for occasional chirps; no new messages from a2dpd***

***hit stop***

A2DPD[10:30:22.184]: pollfd_cb_clients: Client 0: Error detected (err=0, toc=0, err=0, hup=1)

Headset is Creative CB2530. I've had identical results from four different adapters including both Broadcom and CSR chipsets, currently using a DLink DBT-120.

Started hcidump before.

~Chris

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The only thing I see is you use rate=32000, use rate=44100. The whole a2dpd connection seems established.
I suggest you try another headset.

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Well there are things that make me think it almost works. For example, a2play under btsco basically worked, and if I force the chirps to occur quickly enough (by pausing and unpausing the player's process... each cycle causes a chirp) they merge into music. To my uninformed mind this suggests that plugz might work with the headphones if it would just send the data.

So perhaps just to satisfy my own curiosity, why is a2dp not sending any data over bluetooth, as shown through hcidump? Is it waiting for some sort of acknowledgment from the headset?

And what's the status of a2dpd versus a2dpd2?

~Chris

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In retrospect I think I wasn't clear about pcm_a2dpd and pcm_a2dpd2. By those I meant the alsa plugins (libasound_module_pcm_a2dpd[2].so) as opposed to the similarly named daemon and NOT a definition in my .asoundrc.

The "alsa redirect" meant setting enableredirectalsa=1 in .a2dprc. I gather that this causes the a2dpd system to spit sound back out through alsa to speakers instead of through a bluetooth connection.

To restate more clearly (maybe) I'll give you a chart:

a2dpd plugin ("type a2dpd" in .asoundrc):
bluetooth headphones (enableredirect=0 in .a2dprc):
occasional chirps
almost no traffic through hcidump flags=1 only gives info upon occurrance of chirps
normal computer speakers (enableredirect=1):
music sounds fine
a2dpd2 plugin ("type a2dpd2"):
bluetooth headphones (enableredirect=0):
garbled, sped up sound
plenty of hcidump traffic
flags=1 reports once a second or so
normal computer speakers (enableredirect=1):
garbled, sped up sound
ring buffer full messages spew forth

An interesting thing to me is that enableredirect, if it does what I think it does, seems to show a non-bluetooth problem...

~Chris

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