[mythtv-users] 11/20 CVS and ALSA

Sun Nov 21 20:19:30 UTC 2004

Rob,

	I am also running CVS with ALSA and a PVR-250. I am using the same 
settings that you have listed and my setup works with the exception 
that when I mute, I still hear sound coming from at least 1 of the 
channels.

	I am using the latest alsa code 1.0.7rc2 and kernel 2.6.8-1.521.

Jonathan

On Saturday, November 20, 2004, at 11:06 PM, Rob Rosenfeld wrote:

> I have been running 0.16 with ALSA with no audio problems for a month 
> or so.  However, I was affected by the bug where the frontend would 
> freeze as long as it was in a recording, so I decided to upgrade to 
> CVS.  I built CVS with both OSS and ALSA support.  My kernel (2.6.9) 
> has ALSA w/ OSS emulation configured.  It works fine (and fixes my 
> freezes!) as long as I configure audio to use OSS devices in 
> mythfrontend.  I have also confirmed that ALSA still works (there have 
> been no changes) by running:
>
> $ alsaplayer -o alsa some.mp3
>
> Since I had it working before and have been doing a reasonable job of 
> keeping up with the mailing list, I thought I understood how to 
> configure audio for CVS.  I have attempted the following to get ALSA 
> working:
>
> In Utilities/Setup -> Setup -> General ) I set
> Audio ouput device:  ALSA:default
> Mixer device:            default
> Mixer controls:           PCM
>
> I have also tried with Master under Mixer controls.
>
> I have tried both /dev/dsp and ALSA:default for the video card setup 
> in mythsetup.  I have a PVR-250, so not sure if this even matters.
>
> When I try to watch live TV or a recording, I see the following output 
> on the console where I started mythfrontend and a similar warning 
> intervenes in mythfrontend.
> $ mythfronted
> ..
> .   skipped output
> ..
> Timestamp Initializing audio parms from stream #0.
> Timestamp Initializing audio parms from stream #0.
> Timestamp Initializing audio parms from stream #0.
> Could not bind to UDP notify port: 6948
> Timestamp Initializing audio parms from stream #0.
> Timestamp Opening audio device 'default'
> Timestamp mixer unable to find control Master
> Timestamp mixer unable to find control Master
> Timestamp mixer unable to find control PCM
> Timestamp mixer unable to find control PCM
> Timestamp mixer unable to find control PCM
> Timestamp Changing from None to WatchingLiveTV
> Timestamp Decoder not alive, and trying to play..
> Timestamp Changing from None to None
> $
>
> I noticed that it mentions nothing about ALSA which I swore 0.16 used 
> to do and I know OSS does.
> I also noticed the UDP error and don't know if it's relevant.  The 
> following shows nothing on that port:
>
> # netstat -natp
> Active Internet connections (servers and established)
> Proto Recv-Q Send-Q Local Address           Foreign Address         
> State       PID/Program name
> tcp        0      0 0.0.0.0:2442            0.0.0.0:*               
> LISTEN      7078/mtd
> tcp        0      0 127.0.0.1:3306          0.0.0.0:*               
> LISTEN      6472/mysqld
> tcp        0      0 0.0.0.0:6543            0.0.0.0:*               
> LISTEN      3716/mythbackend
> tcp        0      0 0.0.0.0:6544            0.0.0.0:*               
> LISTEN      3716/mythbackend
> tcp        0      0 0.0.0.0:80              0.0.0.0:*               
> LISTEN      6494/apache2
> tcp        0      0 0.0.0.0:22              0.0.0.0:*               
> LISTEN      6477/sshd
> tcp        0      0 0.0.0.0:443             0.0.0.0:*               
> LISTEN      6494/apache2
>
>
> My .asoundrc is attached in case it's useful. It copied and tweaked 
> from http://www.mythtv.info/moin.cgi/DigitalSoundHowTo which Jarod 
> pointed to, so the comments about sound card type are not accurate.  
> (It works great, thanks)
>
> Thanks for taking a look.  Any help appreciated.
>
> Rob
> # Override the default output used by ALSA.
> # If you do not override the default, your default
> # device is identical to the (unmixed) analog device
> # shown below.  If you prefer mixed and/or digital
> # output, uncomment the appropriate four lines below
> # (only one slave.pcm line).
> pcm.!default {
>   type plug
> ## Uncomment the following to use mixed analog by default
> #  slave.pcm "dmix-analog"
> ## Uncomment the following to use unmixed digital by default
> #  slave.pcm "digital-hw"
> ## Uncomment the following to use mixed digital by default
>   slave.pcm "dmix-digital"
> }
>
> # Alias for analog output on the nForce2 (hw:0,0)
> # - This is identical to the device named "default"--which
> # always exists and refers to hw:0,0 (unless overridden)
> # - Therefore, we can specify "hw:0,0", "default", or "analog"
> # to access analog output on the nForce2
> pcm.analog {
>  type plug
>  slave.pcm "analog-hw"
> }
>
> # Control device (mixer, etc.) for the nForce2 card
> ctl.analog {
>  type hw
>  card 0
> }
>
> # Alias for (rate-converted) mixed analog output on the
> # nForce2 (hw:0,0)
> #  - This will accept audio input--regardless of rate--and
> # convert to the rate required for the dmix plugin
> # (in this case 48000Hz)
> pcm.mixed-analog {
>  type plug
>  slave.pcm "dmix-analog"
> }
>
> # Control device (mixer, etc.) for the nForce2 card
> ctl.mixed-analog {
>  type hw
>  card 0
> }
>
> # Alias for (rate-converted) digital (S/PDIF) output on the
> # nForce2 (hw:0,2)
> #  - This will accept audio input--regardless of rate--and
> # convert to the rate required for the S/PDIF hardware
> # (in this case 48000Hz)
> pcm.digital {
>  type plug
>  slave.pcm "digital-hw"
> }
>
> # Control device (mixer, etc.) for the nForce2 card
> ctl.digital {
>  type hw
>  card 0
> }
>
> # Alias for mixed (rate-converted) digital (S/PDIF) output on the
> # nForce2 (hw:0,2)
> #  - This will accept audio input--regardless of rate--and
> # convert to the rate required for the S/PDIF hardware
> # (in this case 48000Hz)
> pcm.mixed-digital {
>  type plug
>  slave.pcm "dmix-digital"
> }
>
> # Control device (mixer, etc.) for the nForce2 card
> ctl.mixed-digital {
>  type hw
>  card 0
> }
>
> # The following devices are not useful by themselves.  They
> # require specific rates, channels, and formats.  Therefore,
> # you probably do not want to use them directly.  Instead use
> # of of the devices defined above.
>
> # Alias for analog output on the nForce2 (hw:0,0)
> # Do not use this directly--it requires specific rate,
> # channels, and format
> pcm.analog-hw {
>  type hw
>  card 0
>  # The default value for device is 0, so no need to specify
> }
>
> # Control device (mixer, etc.) for the nForce2 card
> ctl.analog-hw {
>  type hw
>  card 0
> }
>
> # Alias for digital (S/PDIF) output on the nForce2 (hw:0,2)
> # Do not use this directly--it requires specific rate,
> # channels, and format
> pcm.digital-hw {
>  type hw
>  card 0
> # device 2
> }
>
> # Control device (mixer, etc.) for the nForce2 card
> ctl.digital-hw {
>  type hw
>  card 0
> }
>
> # Direct software mixing plugin for analog output on
> # the nForce2 (hw:0,0)
> # Do not use this directly--it requires specific rate,
> # channels, and format
> pcm.dmix-analog {
>  type dmix
>  ipc_key 1234
>  slave {
>    pcm "analog-hw"
>    period_time 0
>    period_size 1024
>    buffer_size 4096
>    rate 48000
>  }
> }
>
> # Control device (mixer, etc.) for the nForce2 card
> ctl.dmix-analog {
>  type hw
>  card 0
> }
>
> # Direct software mixing plugin for digital (S/PDIF) output
> # on the nForce2 (hw:0,2)
> # Do not use this directly--it requires specific rate,
> # channels, and format
> pcm.dmix-digital {
>  type dmix
>  ipc_key 1235
>  slave {
>    pcm "digital-hw"
>    period_time 0
>    period_size 1024
>    buffer_size 4096
>    rate 48000
>  }
> }
>
> # Control device (mixer, etc.) for the nForce2 card
> ctl.dmix-digital {
>  type hw
>  card 0
> }
>
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