Re: [LAU] Stereo-to-5.1 converter (was Re: ANN: New Quicktoot)

On Fri, May 10, 2013 4:52 am, Joel Roth wrote:
> PM +1000, Patrick Shirkey wrote:
>> We are please to announce a new Quick Toot.
>>
>> The AC3 Test Suite for ALSA
>>
>> http://quicktoots.linux-audio.com
>
> FWIW, here is a Nama script to create Patrick's stereo-to-5.1 converter
> configuration.
>

Nice work Joel, I have added it to the quicktoot.

> channel 1 - Left Front : left input
> channel 2 - Right Front : right input
> channel 3 - Center : left + right + (bandpass 200hz-16000hz) + (amplify
> 71%)
> channel 4 - LFE : left + right + (low pass 200hz) + (amplify 71%)
> channel 5 - Left Rear: inverse left + right + (amplify 50%) + 20ms delay
> channel 6 - Right Rear: inverse channel 5
>
> These are the commands:
>
> add_tracks Stereo L_front R_front Center Subwoofer L_inverted Right R-L
> L_rear R_rear
> add_bunch all Stereo L_front R_front Center Subwoofer L_inverted Right R-L
> L_rear R_rear
>
> # no recording to disk, remove volume and pan controls
> for all; rec_defeat; remove_fader_effect vol; remove_fader_effect pan
>
> # create a bus for summing (inverted L) + R
> add_sub_bus R-L
>
> # we'll do our own routing for these tracks
> Stereo move_to_bus null
> R-L move_to_bus null
>
> # connect six tracks to the stereo source
> for L_front R_front Center Subwoofer L_inverted Right; source track Stereo
>
> # prepare sources for R-L (Note: 'afx' is an abbreviation for
> 'add_effect')
> L_inverted afx chmute 2; afx ea -100
> Right afx chmute 1
>
> # feed these two tracks to R-L
> for L_inverted Right; move_to_bus R-L
>
> # sum R-L source channels to mono
> R-L afx chmix 1
>
> # Center: sum R+L to mono, bandpass, output at channel 3
> Center afx chmix 3; afx efh 200; afx efl 16000; afx ea 70
>
> # Subwoofer: sum R+L to mono, bandpass, output at channel 4
> Subwoofer afx chmix 4; afx efl 200 ; afx ea 70
>
> # L_rear and R_rear get input from R-L
> for L_rear R_rear; source track R-L
>
> # Output L_rear, R_rear at channels 5,6
> L_rear afx chmove 1 5
> R_rear afx ea -100;afx chmove 1 6
>
> Patrick's original script:
>
> #!/bin/bash
>
> ecasound -z:mixmode,sum -f:s16_le,2,48000 \
> -a:1,2,3,4,5,6 -i $1 \
> -a:1 -chmute:2 \
> -a:2 -chmute:1 \
> -a:3 -chmix:3 -efh:200 -efl:16000 -ea:70 \
> -a:4 -chmix:4 -efl:200 -ea:70 \
> -a:5 -chmute:2 -ea:-100 \
> -a:6 -chmute:1 \
> -a:5,6 -o loop,1 \
> -a:7 -i loop,1 \
> -a:7 -efh:200 -efl:16000 -etd:20,0,1,100,100 -ea:50 -o loop,2 \
> -a:8,9 -i loop,2 \
> -a:8 -chmix:5 \
> -a:9 -chmix:6 -ea:-100 \
> -a:1,2,3,4,8,9 -f:s16_le,6,48000 -o $2
>
> Regards,
>
> Joel
>
>
> --
> Joel Roth
> _______________________________________________
> Linux-audio-user mailing list
> Linux-audio-user@email-addr-hidden
> http://lists.linuxaudio.org/listinfo/linux-audio-user
>

--
Patrick Shirkey
Boost Hardware Ltd
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