[mythtv-users] AHH! What happened to my dmix audio??
DaveD
mythtv at guiplot.com
Sun Aug 26 21:36:58 UTC 2007
Almost forgot - you need to reboot with a rescue disk to delete the
asound.state because it gets saved as the sound driver is unloading.
You might be able to rmmod it, then delete it. I have another distro
installed and boot under that, delete /etc/alsa/asound.state, then boot
back into my main distro. I just installed Fedora 7 and it happened
again so this is, once again, fresh in my mind. I'll write protect it
as soon as I reboot!
DaveD
DaveD wrote:
> Did xine crash? Is it set up to use passthrough? These two factors are
> what killed my audio before. It seems xine sets up alsa for its own,
> exclusive use and when it crashes there's nothing to put it back. When
> you reboot, the existing (broken) alsa configuration is stored in
> /etc/asound.state (or maybe asound.conf, I'm not sure as this hasn't
> happened for some time, now) and that same, broken configuration is
> restored when alsa restarts. Took me a long time to figure out the
> first time, but I just deleted the asound.state (maybe .conf?) and
> rebooted. Presto! Sound was back to normal. After this happened
> again, I saved a copy of the asound.conf (state?) and write protected
> the working version. Hope this fixes your problem.
>
> DaveD
>
> Jon Boehm wrote:
>
>> Hi,
>>
>> Everything been working great for quite a while. I use a spdif
>> connection between my htpc and my receiver. I used dmix as my
>> alsa:default thus passing analog and digital audio thru this connection.
>> See the attached asound.conf.
>>
>> I was playing with xine tonight and at one point it popped up some
>> message about not gaining access to the audio channel. Don't know if
>> that was the cause of the problem but now my analog audio pass thru to
>> the spdif connection is GONE!! The digital audio still works (hdtv and
>> dvds.) But no analog source material works (analog tv recording.) Even
>> the annoying system bell is busted. Its like my machine it totally
>> ignoring the asound.conf.
>>
>> jboehm at catwomen:~$ /usr/bin/aplay -D default
>> /usr/share/sounds/alsa/Front_Center.wav
>> Playing WAVE '/usr/share/sounds/alsa/Front_Center.wav' : Signed 16 bit
>> Little Endian, Rate 48000 Hz, Mono
>> But no sound comes out!!!
>>
>> jboehm at catwomen:~$ aplay -l
>> **** List of PLAYBACK Hardware Devices ****
>> card 0: Intel [HDA Intel], device 0: ALC883 Analog [ALC883 Analog]
>> Subdevices: 1/1
>> Subdevice #0: subdevice #0
>> card 0: Intel [HDA Intel], device 1: ALC883 Digital [ALC883 Digital]
>> Subdevices: 1/1
>> Subdevice #0: subdevice #0
>>
>>
>> jboehm at catwomen:~$ aplay -L
>> front:CARD=Intel,DEV=0
>> HDA Intel, ALC883 Analog
>> Front speakers
>> surround40:CARD=Intel,DEV=0
>> HDA Intel, ALC883 Analog
>> 4.0 Surround output to Front and Rear speakers
>> surround41:CARD=Intel,DEV=0
>> HDA Intel, ALC883 Analog
>> 4.1 Surround output to Front, Rear and Subwoofer speakers
>> surround50:CARD=Intel,DEV=0
>> HDA Intel, ALC883 Analog
>> 5.0 Surround output to Front, Center and Rear speakers
>> surround51:CARD=Intel,DEV=0
>> HDA Intel, ALC883 Analog
>> 5.1 Surround output to Front, Center, Rear and Subwoofer speakers
>> surround71:CARD=Intel,DEV=0
>> HDA Intel, ALC883 Analog
>> 7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
>> iec958:CARD=Intel,DEV=0
>> HDA Intel, ALC883 Digital
>> IEC958 (S/PDIF) Digital Audio Output
>> null
>> Discard all samples (playback) or generate zero samples (capture)
>>
>>
>> That -L output doesn't look right to me. It used to have pages of
>> output. This makes me think something in my alsa configuration got
>> hosed.
>>
>> Please help ... I'm panicking a little,
>> Jon
>>
>> ------------------------------------------------------------------------
>>
>> # ~/.asoundrc or /etc/asound.conf
>> # ALSA configuration file
>>
>> ##### USAGE #####
>> # Save this file as "~/.asoundrc" (for user-specific sound configuration) or
>> # "/etc/asound.conf" (for system-wide sound configuration) and specify ALSA
>> # device names ad described in the next section.
>>
>>
>> ##### DEVICE NAMES #####
>> # This configuration file defines four devices for use by the user. Those
>> # devices are "analog", "mixed-analog", "digital", and "mixed-digital". The
>> # user may also re-define "default" to be identical to one of the above-named
>> # devices (i.e. to send all sound output to the digital output unless otherwise
>> # specified). Use the device names as described below:
>> # - "analog" outputs to the analog output directly and (at least on software
>> # sound cards) blocks other audio output. After playback completes, "queued"
>> # sounds are output in sequence.
>> # - "mixed-analog" mixes audio output from multiple programs into the analog
>> # output (so you can hear beeps, alerts, and other noises while playing back
>> # an audio stream).
>> # - "digital" outputs to the digital output directly. Since most (all?)
>> # digital outputs expect 48kHz PCM audio, this may not work for some playback
>> # (i.e. CD's--which are 44.1kHz PCM audio--or 32kHz audio streams from TV
>> # recordings, etc.).
>> # - "mixed-digital"
>>
>> # All other devices created within this file are used only by the configuration
>> # file itself and should /not/ be used directly. In other words, do not use
>> # the devices "analog-hw", "dmix-analog", "digital-hw", or "dmix-digital".
>>
>>
>> ##### IMPORTANT #####
>> # To make this ALSA configuration file work with your sound card, you will need
>> # to define the appropriate card and device information for the "analog-hw" and
>> # "digital-hw" devices below. You can find the card and device information
>> # using "aplay -l".
>>
>>
>> ##### Configuration File #####
>>
>> # 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).
>> #
>> # Note, also, that as of ALSA 1.0.9, "software" sound cards have been modified
>> # such that their default "default" device is identical to the "mixed-analog"
>> # device. Whether using an ALSA version before or after 1.0.9, it does no harm
>> # and has no affect on performance to redefine the device (even if the
>> # redefinition does not change anything). Also, by using this ALSA
>> # configuration file, you once again have access to unmixed analog output using
>> # the "analog" device.
>> pcm.!default {
>> type plug
>> ## Uncomment the following to use (unmixed) "analog" by default
>> # slave.pcm "analog-hw"
>> ## 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"
>> }
>>
>> pcm.rc {
>> type plug
>> slave.pcm "rate-changer"
>> }
>>
>> pcm.rate-changer {
>> type plug
>> slave {
>> # period_time 0
>> # period_size 1024
>> # buffer_size 4096
>> rate 48000
>> pcm "spdif"
>> }
>> }
>>
>> # Control device (mixer, etc.) for the card
>> ctl.!default {
>> type hw
>> card 0
>> }
>>
>> # Alias for (converted) analog output on the card
>> # - 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 card
>> # - Note that as of ALSA 1.0.9, "software" sound card definitions redefine
>> # "default" to do mixing, meaning this device is different from "default" and
>> # allows playback while blocking other sound sources (until playback
>> # completes).
>> pcm.analog {
>> type plug
>> slave.pcm "analog-hw"
>> }
>>
>> # Control device (mixer, etc.) for the card
>> ctl.analog {
>> type hw
>> card 0
>> }
>>
>> # Alias for (converted) mixed analog output on the card
>> # - This will accept audio input--regardless of rate--and convert to the rate
>> # required for the dmix plugin (in this case 48000Hz)
>> # - Note that as of ALSA 1.0.9, "software" sound card definitions redefine
>> # "default" to do mixing, meaning this device is identical to "default" for
>> # "software" sound cards.
>> pcm.mixed-analog {
>> type plug
>> slave.pcm "dmix-analog"
>> }
>>
>> # Control device (mixer, etc.) for the card
>> ctl.mixed-analog {
>> type hw
>> card 0
>> }
>>
>> # Alias for (converted) digital (S/PDIF) output on the card
>> # - 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 card
>> ctl.digital {
>> type hw
>> card 0
>> }
>>
>> # Alias for mixed (converted) digital (S/PDIF) output on the card
>> # - 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 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 card
>> # 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
>> # - Uncomment one of the below or create a new "device N" line as appropriate
>> # for your sound card or
>> # device 1
>> # device 4
>> }
>>
>> # Control device (mixer, etc.) for the card
>> ctl.analog-hw {
>> type hw
>> card 0
>> }
>>
>> # Alias for digital (S/PDIF) output on the card
>> # Do not use this directly--it requires specific rate, channels, and format
>> pcm.digital-hw {
>> type hw
>> card 0
>> device 1
>> # - Comment out "device 1" above and uncomment one of the below or create a
>> # new "device N" line as appropriate for your sound card or
>> # device 2
>> # device 4
>> }
>>
>> # Control device (mixer, etc.) for the card
>> ctl.digital-hw {
>> type hw
>> card 0
>> }
>>
>> # Direct software mixing plugin for analog output on the card
>> # 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 card
>> ctl.dmix-analog {
>> type hw
>> card 0
>> }
>>
>> # Direct software mixing plugin for digital (S/PDIF) output on the card
>> # 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 card
>> ctl.dmix-digital {
>> type hw
>> card 0
>> }
>>
>>
>> ------------------------------------------------------------------------
>>
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