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[[Category:HOWTO]]
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Documents in this category are HOWTO documents explaining a specific scenario or task.  You'll often find that they're more specific than you need, or that they pertain to a slightly different environment than you have, but you can often generalize about what they say to help you, anyway.
[[Category:Sound To DVI and HDMI]]
 
  
== To send sound to both DVI and HDMI via ALSA eg. to TV and Amplifier simultaneously you can use an .asoundrc file in your home directory. ==
 
Firstly a note or two -
 
# Sound CAN be sent over DVI, if you sound card supports it. Preferably use a DVI to HDMI connector / cobale (often cheaper than an HDMI to HDMI cable)
 
# Your sound device (presumably a graphics card with built in sound eg. NVidia GT430 as used here) needs to treat DVI and HDMI connectors similarly
 
# The sound device (graphics card) needs to support sound
 
  
Secondly, Pulse is probably easier if that is what you use, but this is useful for those of us using ALSA
+
[[Category:Knowledge Base]]
 
 
===The asoundrc file===
 
 
 
<pre>
 
# .asoundrc
 
# Add to your home directory
 
# works with NVidia GT430 ... once the video card itself is set to work correctly
 
#
 
# Default ALSA to send to both DVI and HDMI
 
pcm.!default {
 
    type plug
 
    slave {
 
        # The following line actually does the work
 
        pcm "hdmi_dvi_both"
 
    }
 
}
 
# DVI connection on GT430
 
pcm.!hdmi3 {
 
    type hw
 
    card 0
 
    device 3
 
    channels 2
 
}
 
# Doesn't seem to be necessary, just for completeness
 
ctl.!hdmi3 {
 
    type hw
 
    card 0
 
    device 3
 
    channels 2
 
}
 
pcm.!hdmi7 {
 
    type hw
 
    card 0
 
    device 7
 
    channels 2
 
}
 
pcm.!hdmi8 {
 
    type hw
 
    card 0
 
    device 8
 
    channels 2
 
}
 
# HDMI Connection on GT430
 
pcm.!hdmi9 {
 
    type hw
 
    card 0
 
    device 9
 
    channels 2
 
}
 
# Doesn't seem to be necessary, just for completeness
 
ctl.!hdmi9 {
 
    type hw
 
    card 0
 
    device 9
 
    channels 2
 
}
 
 
 
pcm.multi_dig {
 
    type multi
 
    # Define DVI slave
 
    slaves.a {
 
        pcm "hdmi3"
 
        # In this version, only pass 2 channels (like SPDIF)
 
        channels 2
 
    }
 
    # Define HDMI slave
 
    slaves.b {
 
        pcm "hdmi9"
 
        # In this version, only pass 2 channels (like SPDIF)
 
        channels 2
 
    }
 
    # Bind the 2 DVI channels to a name ie "a"
 
    bindings.0.slave a
 
    bindings.0.channel 0
 
    bindings.1.slave a
 
    bindings.1.channel 1
 
 
 
    # Bind the 2 HDMI channels to a name ie "b"
 
    bindings.2.slave b
 
    bindings.2.channel 0
 
    bindings.3.slave b
 
    bindings.3.channel 1
 
}
 
# Define the routing which actually send s the signal to both DVI and HDMI
 
pcm.hdmi_dvi_both {
 
    type route
 
    slave {
 
        pcm "multi_dig"
 
        # The channels definition is critical to define the total number of channels out (2 sets of 2)
 
        channels 4
 
    }
 
    # The first dot after "ttable" defines the channel out
 
    # The second dot defines the channel as bound above in the "multi-dig" definition
 
    # Define 4 channels out in total, 2 each for DVI and HDMI
 
    ttable.0.0 1
 
    ttable.1.1 1
 
    ttable.0.2 1
 
    ttable.1.3 1
 
}
 
# You may have to mess around with your TV and amp depending on what they support
 
# My curent setup is MythTv v 0.23
 
# my amp supports Dolby, DTS and AC3
 
# my TV support DTS and AC# ... but NOT Dolby (just get nasty "noise" if "dolby" selected in MythTv)
 
# I sent HDMI to TV because of default colour space etc
 
# and DVI to amp cause its not sensitive to colour etc. (just used for sound)
 
# BUT need to tell NVidia Config to send video to both (default is DVI only)
 
 
 
</pre>
 
 
 
Paste the above file into your home directory as ".asoundrc"
 
Go to MythTv Setup / General / Audio System and set the "Audio output device" to ALSA:default or ALSA:hdmi_dvi_both
 
 
 
Depending on your TV and Amp you may also need to change the settings for 5.1 sound. Your devices may or may not support
 
# AC3 (nothing else selected)
 
# Dolby
 
# DTS
 
In my case,
 
# TV supports AC3 and DTS but NOT Dolby
 
# Amp supports all the above (but not 7.1 bitstream)
 
Now I can use either TV sound or Amp sound or both
 

Latest revision as of 12:41, 7 March 2011

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