I have a Sony DRBT21G and I have high quality audio working.
I am using bluez-3.18 libs and utils.
But, I am only getting mono sound. Stereo is not working. Here is an
example running mpg123-alsa...
$ mpg123-alsa -v -a bluetooth test.mp3
Playing MPEG stream 1 of 1: 06 Money.mp3 ...
Title: Money
Artist: Pink Floyd
Album: The Dark Side of the Moon [SACD]
Year: 2003
Genre: Rock
Comment:
MPEG 1.0, Layer: III, Freq: 44100, mode: Joint-Stereo, modext: 0, BPF : 835
Channels: 2, copyright: No, original: No, CRC: No, emphasis: 0.
Bitrate: 256 kbits/s Extension value: 0
Audio: 1:1 conversion, rate: 44100, encoding: signed 16 bit, channels: 1
This last line seems to indicate that the audio is being converted to
1 channel. The missing stereo separation is particularly noticeable in
this song since the beginning starts out with cash register sounds
alternating from one ear to the other.
Similarly, mplayer prints out these lines for an mpg file:
Forced audio codec: mad
Opening audio decoder: [libmad] libmad mpeg audio decoder
AUDIO: 48000 Hz, 2 ch, s16le, 128.0 kbit/8.33% (ratio: 16000->192000)
Selected audio codec: [mad] afm: libmad (libMAD MPEG layer 1-2-3)
==========================================================================
AO: [alsa] 44100Hz 1ch s16le (2 bytes per sample)
my .asoundrc has:
pcm.bluetooth {
type bluetooth
device 00:13:A9:C5:20:32
profile hifi
mode stereo
# subbands "8"
# blocks "16"
# bitpool "250"
# allocation snr
# rate "44100"
}
There was a bug in pcm_bluetooth.c that prevented mode from being
parsed properly, a patch is attached at the end of this email.
Here is some of the hcidump:
> ACL data: handle 1 flags 0x02 dlen 10
L2CAP(d): cid 0x0040 len 6 [psm 25]
AVDTP(s): Discover rsp: transaction 0
ACP SEID 1 - Audio Sink
ACP SEID 2 - Audio Sink
< ACL data: handle 1 flags 0x02 dlen 7
L2CAP(d): cid 0x0052 len 3 [psm 25]
AVDTP(s): Capabilities cmd: transaction 1
ACP SEID 1
> HCI Event: Number of Completed Packets (0x13) plen 5
> ACL data: handle 1 flags 0x02 dlen 20
L2CAP(d): cid 0x0040 len 16 [psm 25]
AVDTP(s): Capabilities rsp: transaction 1
Media Transport
Media Codec - SBC
16kHz 32kHz 44.1kHz 48kHz
Mono DualChannel Stereo JointStereo
4 8 12 16 Blocks
4 8 Subbands
SNR Loudness
Bitpool Range 2-53
Content Protection
02 00
< ACL data: handle 1 flags 0x02 dlen 7
L2CAP(d): cid 0x0052 len 3 [psm 25]
AVDTP(s): Capabilities cmd: transaction 2
ACP SEID 2
> HCI Event: Number of Completed Packets (0x13) plen 5
> ACL data: handle 1 flags 0x02 dlen 16
L2CAP(d): cid 0x0040 len 12 [psm 25]
AVDTP(s): Capabilities rsp: transaction 2
Media Transport
Media Codec - MPEG-1,2 Audio
3F 07 FF FE
< ACL data: handle 1 flags 0x02 dlen 18
L2CAP(d): cid 0x0052 len 14 [psm 25]
AVDTP(s): Set config cmd: transaction 3
ACP SEID 1 - INT SEID 1
Media Transport
Media Codec - SBC
44.1kHz
JointStereo
16 Blocks
8 Subbands
Loudness
Bitpool Range 2-53
> HCI Event: Number of Completed Packets (0x13) plen 5
> ACL data: handle 1 flags 0x02 dlen 6
L2CAP(d): cid 0x0040 len 2 [psm 25]
AVDTP(s): Set config rsp: transaction 3
< ACL data: handle 1 flags 0x02 dlen 7
L2CAP(d): cid 0x0052 len 3 [psm 25]
AVDTP(s): Open cmd: transaction 4
ACP SEID 1
> HCI Event: Number of Completed Packets (0x13) plen 5
> ACL data: handle 1 flags 0x02 dlen 6
L2CAP(d): cid 0x0040 len 2 [psm 25]
AVDTP(s): Open rsp: transaction 4
< ACL data: handle 1 flags 0x02 dlen 12
L2CAP(s): Connect req: psm 25 scid 0x0041
> HCI Event: Number of Completed Packets (0x13) plen 5
> ACL data: handle 1 flags 0x02 dlen 16
L2CAP(s): Connect rsp: dcid 0x0053 scid 0x0041 result 1 status 2
Connection pending - Authorization pending
> ACL data: handle 1 flags 0x02 dlen 16
L2CAP(s): Connect rsp: dcid 0x0053 scid 0x0041 result 0 status 0
Connection successful
< ACL data: handle 1 flags 0x02 dlen 12
L2CAP(s): Config req: dcid 0x0053 flags 0x00 clen 0
> ACL data: handle 1 flags 0x02 dlen 16
L2CAP(s): Config req: dcid 0x0041 flags 0x00 clen 4
MTU 895
< ACL data: handle 1 flags 0x02 dlen 18
L2CAP(s): Config rsp: scid 0x0053 flags 0x00 result 0 clen 4
Success
MTU 895
> HCI Event: Number of Completed Packets (0x13) plen 5
> HCI Event: Number of Completed Packets (0x13) plen 5
> ACL data: handle 1 flags 0x02 dlen 14
L2CAP(s): Config rsp: scid 0x0041 flags 0x00 result 0 clen 0
Success
< ACL data: handle 1 flags 0x02 dlen 7
L2CAP(d): cid 0x0052 len 3 [psm 25]
AVDTP(s): Start cmd: transaction 5
ACP SEID 1
> HCI Event: Number of Completed Packets (0x13) plen 5
> ACL data: handle 1 flags 0x02 dlen 6
L2CAP(d): cid 0x0040 len 2 [psm 25]
AVDTP(s): Start rsp: transaction 5
< ACL data: handle 1 flags 0x02 dlen 7
As you can see, these headphones also support mpeg codec.
I don't know if I am reading that dump correctly, but it looks like
joint-stereo is being selected every time regardless of what mode is
set to in .asoundrc
Any help is appreciated,
-brandon
--- pcm_bluetooth.c_orig 2007-09-15 03:46:30.000000000 -0500
+++ pcm_bluetooth.c 2007-09-15 03:48:06.000000000 -0500
@@ -995,15 +995,15 @@
return -EINVAL;
}
- if (strcmp(pref, "auto") == 0)
+ if (strcmp(mode, "auto") == 0)
cfg->mode = CFG_MODE_AUTO;
- else if (strcmp(pref, "mono") == 0)
+ else if (strcmp(mode, "mono") == 0)
cfg->mode = CFG_MODE_MONO;
- else if (strcmp(pref, "dual") == 0)
+ else if (strcmp(mode, "dual") == 0)
cfg->mode = CFG_MODE_DUAL_CHANNEL;
- else if (strcmp(pref, "stereo") == 0)
+ else if (strcmp(mode, "stereo") == 0)
cfg->mode = CFG_MODE_STEREO;
- else if (strcmp(pref, "joint") == 0)
+ else if (strcmp(mode, "joint") == 0)
cfg->mode = CFG_MODE_JOINT_STEREO;
continue;
}
@@ -1014,11 +1014,11 @@
return -EINVAL;
}
- if (strcmp(pref, "auto") == 0)
+ if (strcmp(allocation, "auto") == 0)
sbc->allocation = CFG_ALLOCATION_AUTO;
- else if (strcmp(pref, "loudness") == 0)
+ else if (strcmp(allocation, "loudness") == 0)
sbc->allocation = CFG_ALLOCATION_LOUDNESS;
- else if (strcmp(pref, "snr") == 0)
+ else if (strcmp(allocation, "snr") == 0)
sbc->allocation = CFG_ALLOCATION_SNR;
continue;
}
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Hi,
> I would like to know where can I find the HCI and LMP implementation in
> BlueZ!
> I tried to look in the source code for BlueZ, and only higher levels are
> present. I couldn't find any packet headers/playload, LMP messages (like
> Host_Connection_Req) or other low level Bluetooth implementation codes in
> there.
> I think it's part of the kernel.. but I couldn't find any .. can u help me
> please..?
the LMP is part of the Bluetooth chip. We don't have to implement that
inside the kernel.
Regards
Marcel
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Dear all,
I would like to know where can I find the HCI and LMP implementation in
BlueZ!
I tried to look in the source code for BlueZ, and only higher levels are
present. I couldn't find any packet headers/playload, LMP messages (like
Host_Connection_Req) or other low level Bluetooth implementation codes in
there.
I think it's part of the kernel.. but I couldn't find any .. can u help me
please..?
Thanks..
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On 9/16/07, Marcel Holtmann <[email protected]> wrote:
> Hi Brandon,
>
> > I have a Sony DRBT21G and I have high quality audio working.
> > I am using bluez-3.18 libs and utils.
> >
> > But, I am only getting mono sound. Stereo is not working. Here is an
> > example running mpg123-alsa...
> please check bluez-utils-3.19 since this bug should have been fixed
> already.
confirmed, 3.19 fixes it! Wow, it sounds great.
thanks,
-brandon
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Hi Brandon,
> I have a Sony DRBT21G and I have high quality audio working.
> I am using bluez-3.18 libs and utils.
>
> But, I am only getting mono sound. Stereo is not working. Here is an
> example running mpg123-alsa...
>
> $ mpg123-alsa -v -a bluetooth test.mp3
> Playing MPEG stream 1 of 1: 06 Money.mp3 ...
>
> Title: Money
> Artist: Pink Floyd
> Album: The Dark Side of the Moon [SACD]
> Year: 2003
> Genre: Rock
> Comment:
>
> MPEG 1.0, Layer: III, Freq: 44100, mode: Joint-Stereo, modext: 0, BPF : 835
> Channels: 2, copyright: No, original: No, CRC: No, emphasis: 0.
> Bitrate: 256 kbits/s Extension value: 0
> Audio: 1:1 conversion, rate: 44100, encoding: signed 16 bit, channels: 1
>
>
> This last line seems to indicate that the audio is being converted to
> 1 channel. The missing stereo separation is particularly noticeable in
> this song since the beginning starts out with cash register sounds
> alternating from one ear to the other.
please check bluez-utils-3.19 since this bug should have been fixed
already.
Regards
Marcel
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