[snd-bt87x] Prolink PixelView PlayTV

[snd-bt87x] Prolink PixelView PlayTV

[Jan Anders]

Hi,

I'd like to report a working device:

 Name: Prolink PixelView PlayTV
 Kernel: 2.6.23
 ID: 0x878-0x00:0x00
 Digital Rate: 128000 (I think)

I can record mono fine with arecord:

 % arecord -D hw:2,1 -f S16_LE -t wav test.wav
 Recording WAVE 'test.wav' : Signed 16 bit Little Endian, Rate 8000 Hz, Mono
 Warning: rate is not accurate (requested = 8000Hz, got = 119466Hz)
        please, try the plug plugin
 Aborted by signal Interrupt...

When I try to load the module with another sample rate (sudo modprobe
snd- bt87x load_all=1 digital_rate=44100) it still reports "...using
default rate 32000".

Also, I cannot record via the OSS-Layer: zapping hangs when I select
the /dev/dsp device, and
 streamer -C /dev/dsp2 -p 4 -t 0:03 -r 24 -q -o test.avi -j 90 -f
mjpeg -F mono16
only gives an error, but no sound:
 oss: read: Input/output error

Can you give me some hints on how to record video+audio and
determining the correct sample rate?

As I am not subscribed to alsa-devel, I would appreciate a CC of any answers.

Thanks in advance
-Jan

Re: [snd-bt87x] Prolink PixelView PlayTV

[Takashi Iwai]

At Mon, 28 Apr 2008 02:46:34 +0200,
Jan Anders wrote:
> 
> Hi,
> 
> I'd like to report a working device:
> 
>  Name: Prolink PixelView PlayTV
>  Kernel: 2.6.23
>  ID: 0x878-0x00:0x00
>  Digital Rate: 128000 (I think)
> 
> I can record mono fine with arecord:
> 
>  % arecord -D hw:2,1 -f S16_LE -t wav test.wav
>  Recording WAVE 'test.wav' : Signed 16 bit Little Endian, Rate 8000 Hz, Mono
>  Warning: rate is not accurate (requested = 8000Hz, got = 119466Hz)

The rate the driver suggested looks scary.  Something must be broken
more deeply..


Takashi

Re: [snd-bt87x] Prolink PixelView PlayTV

[Clemens Ladisch]

Takashi Iwai wrote:
> Jan Anders wrote:
> >  Warning: rate is not accurate (requested = 8000Hz, got = 119466Hz)
>
> The rate the driver suggested looks scary.

It's OK, this is the minimum rate supported by the hardware.
(It seems the same ADC is used for digitizing video and audio.)

> > I'd like to report a working device:
> >
> >  Name: Prolink PixelView PlayTV
> >  Kernel: 2.6.23
> >  ID: 0x878-0x00:0x00
> >  Digital Rate: 128000 (I think)
> >
> > I can record mono fine with arecord:
> >
> >  % arecord -D hw:2,1 -f S16_LE -t wav test.wav

This records from an analog input.
Does recording from the digital input device (hw:2,0) work?


Regards,
Clemens

Re: [snd-bt87x] Prolink PixelView PlayTV

[Trent Piepho]

On Mon, 28 Apr 2008, Takashi Iwai wrote:
> At Mon, 28 Apr 2008 02:46:34 +0200,
> Jan Anders wrote:
> >
> > Hi,
> >
> > I'd like to report a working device:
> >
> >  Name: Prolink PixelView PlayTV
> >  Kernel: 2.6.23
> >  ID: 0x878-0x00:0x00
> >  Digital Rate: 128000 (I think)
> >
> > I can record mono fine with arecord:
> >
> >  % arecord -D hw:2,1 -f S16_LE -t wav test.wav
> >  Recording WAVE 'test.wav' : Signed 16 bit Little Endian, Rate 8000 Hz, Mono
> >  Warning: rate is not accurate (requested = 8000Hz, got = 119466Hz)
>
> The rate the driver suggested looks scary.  Something must be broken
> more deeply..

It's normal for the chip.  It does 8-bit mono at very high sample rates to
allow for software decoding of stereo TV audio.  I think 119466 Hz is the
lowest rate it supports, which is why is choose it when 8000 Hz was
requested.

Re: [snd-bt87x] Prolink PixelView PlayTV

[Jan Anders]

Hi,

>  This records from an analog input.
>  Does recording from the digital input device (hw:2,0) work?

I am not at home right now, but I tried it via ssh and it failed:

 % arecord -D hw:2,0 -f S16_LE -c2 -r64000 -t wav bla.wav
 Recording WAVE 'bla.wav' : Signed 16 bit Little Endian, Rate 64000 Hz, Stereo
 arecord: pcm_read:1348: read error: Input/output error

Recording analog mono works fine remotely.

Regards,
-Jan

Re: [snd-bt87x] Prolink PixelView PlayTV

[Nathan Schulte]

I recently purchased an ECS A740GM-M Motherboard which has an IDT 92HD202
integrated audio chipset.

Alsa is recognizing it as a SigmaTel 9221 A2. It is similar to the SigmaTel
chipsets, but I cannot get spdif to work. After looking at the sigmatel
hda-intel patch, it seems that spdif out is limited to two channels.

What I'm wondering is this; is there any need to write a new driver to get
this chip working? And if so, where should I start, or has someone already
started?

I'm willing to take this on, but I don't know where to start. Any advice
would be helpful!

-Nate