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| − | [[Category:HOWTO]]
| + | 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 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 -
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| − | # 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
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| − | # The sound device (graphics card) needs to support sound
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| | | | |
| − | 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
| + | |
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.
