Bt87x Audio Capture

Bt87x Audio Capture

[Ondrej Ivanič]

Hi

I have problems with audio capture function on my tv card. After 
`modprobe snd_bt87x', I have got nothing in logs (dmesg, messages).

Last relevant info is from bt878 module:

bt878: AUDIO driver version 0.0.0 loaded
bt878: Bt878 AUDIO function found (0).
PCI: Found IRQ 12 for device 0000:00:0a.1
PCI: Sharing IRQ 12 with 0000:00:0a.0
bt878(0): Bt878 (rev 17) at 00:0a.1, irq: 12, latency: 64, memory: 
0xe9000000
PCI: Found IRQ 10 for device 0000:00:0c.0
PCI: Sharing IRQ 10 with 0000:00:07.2

lspci output:
$ lspci -s 00:0a -vn
00:0a.0 0400: 109e:036e (rev 11)
         Subsystem: 11bd:0012
         Flags: bus master, medium devsel, latency 64, IRQ 12
         Memory at e9002000 (32-bit, prefetchable) [size=4K]
         Capabilities: [44] Vital Product Data
         Capabilities: [4c] Power Management version 2

00:0a.1 0480: 109e:0878 (rev 11)
         Subsystem: 11bd:0012
         Flags: bus master, medium devsel, latency 64, IRQ 12
         Memory at e9000000 (32-bit, prefetchable) [size=4K]
         Capabilities: [44] Vital Product Data
         Capabilities: [4c] Power Management version 2

$ lspci -s 00:0a
00:0a.0 Multimedia video controller: Brooktree Corporation Bt878 Video 
Capture (rev 11)
00:0a.1 Multimedia controller: Brooktree Corporation Bt878 Audio Capture 
(rev 11)

alsa configuration:

alias snd-card-0 snd-ens1371
alias snd-card-1 snd-bt87x
alias sound-slot-0 snd-card-0
alias sound-slot-1 snd-card-1

options snd-bt87x id="tv" load_all=1

# OSS/Free portion - card #1
alias sound-service-0-0 snd-mixer-oss
alias sound-service-0-1 snd-seq-oss
alias sound-service-0-3 snd-pcm-oss
alias sound-service-0-8 snd-seq-oss
alias sound-service-0-12 snd-pcm-oss
##  OSS/Free portion - card #2
alias sound-service-1-0 snd-mixer-oss
alias sound-service-1-3 snd-pcm-oss
alias sound-service-1-12 snd-pcm-oss

alias /dev/mixer snd-mixer-oss
alias /dev/dsp snd-pcm-oss
alias /dev/midi snd-seq-oss

options snd cards_limit=2

lsmod output:
$ lsmod
Module                  Size  Used by
snd_bt87x              11496  0
snd_seq_midi            6816  0
snd_pcm_oss            49440  0
snd_mixer_oss          17088  1 snd_pcm_oss
snd_seq_oss            31552  0
snd_seq_midi_event      5664  2 snd_seq_midi,snd_seq_oss
snd_seq                47824  5 snd_seq_midi,snd_seq_oss,snd_seq_midi_event
snd_ens1371            18596  0
snd_rawmidi            19840  2 snd_seq_midi,snd_ens1371
snd_seq_device          6732  4 snd_seq_midi,snd_seq_oss,snd_seq,snd_rawmidi
snd_ac97_codec         93088  1 snd_ens1371
snd_ac97_bus            1728  1 snd_ac97_codec
bt878                   8088  0
tuner                  43012  0
tda9887                14352  0
msp3400                32848  0
bttv                  158480  1 bt878
video_buf              17060  1 bttv
i2c_algo_bit            8360  1 bttv
btcx_risc               3912  1 bttv
tveeprom               13744  1 bttv
i2c_core               16752  6 
tuner,tda9887,msp3400,bttv,i2c_algo_bit,tveeprom
snd_pcm                79976  4 
snd_bt87x,snd_pcm_oss,snd_ens1371,snd_ac97_codec
snd_timer              20580  2 snd_seq,snd_pcm
snd                    44804  11 
snd_bt87x,snd_pcm_oss,snd_mixer_oss,snd_seq_oss,snd_seq,snd_ens1371,snd_rawmidi,snd_seq_device,snd_ac97_codec,snd_pcm,snd_timer
soundcore               7168  1 snd
snd_page_alloc          8424  2 snd_bt87x,snd_pcm

I don't have an idea what is wrong, because I can't found any output 
from snd_bt87x module.

Thanks

PS. I'm not on the list. Send CC to me, please.

-- 
Ondrej Ivanic
(ondrej@kmit.sk)


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Re: Bt87x Audio Capture

[Clemens Ladisch]

Ondrej Ivani?? wrote:
> After `modprobe snd_bt87x', I have got nothing in logs.
> 
> Last relevant info is from bt878 module:
> 
> bt878: AUDIO driver version 0.0.0 loaded

This is the wrong module.  "bt878" is the old OSS driver, but you want
to use the "snd-bt87x" driver.


HTH
Clemens


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Re: Bt87x Audio Capture

[Ondrej Ivanič]

Hi

>>After `modprobe snd_bt87x', I have got nothing in logs.
>>
>>Last relevant info is from bt878 module:
>>
>>bt878: AUDIO driver version 0.0.0 loaded
> 
> This is the wrong module.  "bt878" is the old OSS driver, but you want

I didn't have OSS support in kernel and this module is from media/dvb:

filename: 
/lib/modules/2.6.15-gentoo-r1-3/kernel/drivers/media/dvb/bt8xx/bt878.ko
license:        GPL
vermagic:       2.6.15-gentoo-r1-3 PENTIUMIII gcc-3.4
depends:        bttv
alias:          pci:v0000109Ed00000878sv*sd*bc*sc*i*
parm:           debug:Turn on/off debugging, default is 0 (off). (int)
parm:           verbose:verbose startup messages, default is 1 (yes) (int)

> to use the "snd-bt87x" driver.


I was unloaded all modules form kernel and loaded only snd_bt87x module:

localhost init.d # lsmod
Module                  Size  Used by
localhost init.d # modprobe snd_bt87x load_all=1 enable=1
localhost init.d # cat /proc/asound/cards
--- no soundcards ---
localhost init.d # ls -la /dev/snd/
total 0
drwxr-xr-x   2 root root       60 Mar  9 01:51 .
drwxr-xr-x  13 root root     2720 Mar  9 01:51 ..
crw-rw----   1 root audio 116, 33 Mar  9 01:51 timer

In dmesg was't any output from snd_bt87x module...

Thanks

-- 
Ondrej Ivanic
(ondrej@kmit.sk)


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Re: Bt87x Audio Capture

[Clemens Ladisch]

Ondrej Ivani?? wrote:
> >>bt878: AUDIO driver version 0.0.0 loaded
> >
> >This is the wrong module.  "bt878" is the old OSS driver, but you want
> 
> I didn't have OSS support in kernel and this module is from media/dvb:

Oops.  The OSS driver would have been "btaudio".

> /lib/modules/2.6.15-gentoo-r1-3/kernel/drivers/media/dvb/bt8xx/bt878.ko

The bt878 driver in the 2.6.15 kernel is buggy; it grabs the audio
function even for non-DVB cards.

> >to use the "snd-bt87x" driver.
> 
> I was unloaded all modules form kernel and loaded only snd_bt87x module:
> 
> localhost init.d # modprobe snd_bt87x load_all=1 enable=1
> localhost init.d # cat /proc/asound/cards
> --- no soundcards ---

The snd-bt87x driver in the same kernel has a bug that prevents it from
working with the load_all parameter.  This was fixed with this patch:
http://www.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=blobdiff;h=c840a4c08e9814c197d30b631b782c420e26869a;hp=aaaa2e0d45c22aec11ac2325a488d27e392a0f96;hb=54c63cfc153c6909a5d5dbe6072e8704b091f30e;f=sound/pci/bt87x.c


HTH
Clemens


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Re: Bt87x Audio Capture

[Ondrej Ivanič]

Clemens Ladisch wrote:

> The snd-bt87x driver in the same kernel has a bug that prevents it from
> working with the load_all parameter.  This was fixed with this patch:
> http://www.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=blobdiff;h=c840a4c08e9814c197d30b631b782c420e26869a;hp=aaaa2e0d45c22aec11ac2325a488d27e392a0f96;hb=54c63cfc153c6909a5d5dbe6072e8704b091f30e;f=sound/pci/bt87x.c

Yes, my card was detected as an unknown card 0x11bd:0x12. I don't have 
idea how to identify correct digital_rate value for card.

I playing with a tvtime and arecord. In the tvtime I was tuned a tv 
channel and with arecord I was tryied to record some sound from TV card 
capture device.

card 0: AudioPCI [Ensoniq AudioPCI], device 0: ES1371/1 [ES1371 DAC2/ADC]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
card 1: Bt878 [Brooktree Bt878], device 0: Bt87x Digital [Bt87x Digital]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
card 1: Bt878 [Brooktree Bt878], device 1: Bt87x Analog [Bt87x Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0

$ arecord -Dhw:1,1 -f S16_LE -r 119466 -d 20 /tmp/out.wav

Output file contains only wav header and 0x7fff values.

BTW, it's possible to create interconnect between sound card and capture 
device in TV card? I would like to live without cable from TV card to 
sound card line in. I was read something about dmix and dsnoop plugins, 
but i have't idea.


-- 
Ondrej Ivanic
(ondrej@kmit.sk)


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Re: Bt87x Audio Capture

[Clemens Ladisch]

Ondrej Ivani?? wrote:
> card 1: Bt878 [Brooktree Bt878], device 0: Bt87x Digital [Bt87x Digital]
>   Subdevices: 1/1
>   Subdevice #0: subdevice #0
> card 1: Bt878 [Brooktree Bt878], device 1: Bt87x Analog [Bt87x Analog]
>   Subdevices: 1/1
>   Subdevice #0: subdevice #0
> 
> $ arecord -Dhw:1,1 -f S16_LE -r 119466 -d 20 /tmp/out.wav
> 
> Output file contains only wav header and 0x7fff values.

It seems the analog input pin of the Bt878 chip isn't connected to the
tuner.

I guess the digital input isn't connected, either.

> BTW, it's possible to create interconnect between sound card and capture 
> device in TV card?

It would be possible to write an application that records from one of
the Bt878 input devices and then immediately plays the data to the sound
card.  There would be some milliseconds of latency, and it wouldn't work
in most cases because few vendors bother to connect the audio input pins
(as you've seen).


Regards,
Clemens


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