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AC3 command not getting sent to receiver
http://forum.linhes.org/viewtopic.php?f=2&t=7285
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Author:  shrkbait [ Thu Dec 08, 2005 11:18 pm ]
Post subject:  AC3 command not getting sent to receiver

I run 100% out my coax to a Harman Kardon AVR-75 (kinda old). Works perfect when sending pcm, but when I play a DVD I need to press this litt AC3 button on my remote. If I skip ahead a chapter, it resets and I need to hit the button again. I am running an nforce2 board (Asus A7N8X), and alsa as setup in the DigitalSoundHowto. Googled forever to no avail. Standalone DVD works, digital cable works, just no myth box. Anyone ever heard of something like this, or know if the chipset or the driver is in charge of sending the ac3 setup, please let me know.

Author:  jbman [ Fri Dec 09, 2005 8:56 am ]
Post subject: 

what does your .asound file look like?

Author:  shrkbait [ Fri Dec 09, 2005 8:13 pm ]
Post subject: 

Here ya go

Code:
[root@jules ~]# cat /etc/asound.conf
# 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 nForce2/4 (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 nForce2/4
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
# nForce2/4 (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 nForce2/4 card
ctl.analog-hw {
 type hw
 card 0
}

# Alias for digital (S/PDIF) output on the nForce2/4 (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 nForce2/4 card
ctl.digital-hw {
 type hw
 card 0
}

# Direct software mixing plugin for analog output on
# the nForce2/4 (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 nForce2/4 card
ctl.dmix-analog {
 type hw
 card 0
}

# Direct software mixing plugin for digital (S/PDIF) output
# on the nForce2/4 (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 nForce2/4 card
ctl.dmix-digital {
 type hw
 card 0
}



And from modprobe.conf
Code:
# ALSA portion
alias char-major-116 snd
alias snd-card-0 snd-intel8x0
# module options should go here

# OSS/Free portion
alias char-major-14 soundcore
alias snd-slot-0 snd-card-0

# 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
options snd-pcm-oss dsp_map=0,2
install snd-intel8x0 /sbin/modprobe --ignore-install snd-intel8x0 && /usr/sbin/alsactl restore >/dev/null 2>&1 || :
remove snd-intel8x0 { /usr/sbin/alsactl store >/dev/null 2>&1 || : ; }; /sbin/modprobe -r --ignore-remove snd-intel8x0


In my mythfrontend startup script right before mythfrontend
Code:
# Restore audio settings
/usr/sbin/alsactl restore


And how I call out audio in myth
Code:
mysql> select value,data from settings where data like "%alsa%";
+-------------------+--------------------+
| value             | data               |
+-------------------+--------------------+
| AudioOutputDevice | ALSA:mixed-digital |
| AudioDevice       | ALSA:digital       |
+-------------------+--------------------+
2 rows in set (0.00 sec)


Audio setup for mplayer
Code:
ao=alsa:device=digital
# if ac3 audio, send raw stream to my amp, else fall back
ac=hwac3,


Audio setup for xine

Code:
# audio driver to use
# { auto  null  alsa  oss  arts  esd  none  file }, default: 0
audio.driver:alsa

# use A/52 dynamic range compression
# bool, default: 0
#audio.a52.dynamic_range:0

# downmix audio to 2 channel surround stereo
# bool, default: 0
#audio.a52.surround_downmix:0

# A/52 volume
# [0..200], default: 100
#audio.a52.level:100

# device used for mono output
# string, default: default
audio.device.alsa_default_device:spdif

# device used for stereo output
# string, default: plug:front:default
audio.device.alsa_front_device:default

# alsa mixer device
# string, default: PCM
#audio.device.alsa_mixer_name:PCM

# sound card can do mmap
# bool, default: 0
#audio.device.alsa_mmap_enable:0

# device used for 5.1-channel output
# string, default: iec958:AES0=0x6,AES1=0x82,AES2=0x0,AES3=0x2
audio.device.alsa_passthrough_device:spdif

# device used for 4-channel output
# string, default: plug:surround40:0
#audio.device.alsa_surround40_device:plug:surround40:0

# device used for 5.1-channel output
# string, default: plug:surround51:0
audio.device.alsa_surround51_device:plug:mixed-digital

# speaker arrangement
# { Mono 1.0  Stereo 2.0  Headphones 2.0  Stereo 2.1  Surround 3.0  Surround 4.0  Surround 4.1  Surround 5.0  Surround 5.1  Surround 6.0  Surrou
nd 6.1  Surround 7.1  Pass Through }, default: 1
audio.output.speaker_arrangement:Pass Through


Chances are its my receiver and I am SOL.

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