low pass high pass global filter for alsa

[urhaxable]

I have been wanting a system wide EQ basically to remove low frequencies from fronts, center, rears and remove high frequencies from the subwoofers. i have been unable to find a system wide EQ that can control frequencies of each channel. So I gave up on that as I don't think it exists. So I found that with ALSA you can edit .asounrc and create filters and controls. So I figured I'd go this route. I have come up with an .asoundrc that I think should , but doesn't. I've looked at many examples, read manpages, docs, etc. everything I could find. Here is my file, can anyone help me figure out why it does not work. If possible also create a stereo to 5.1 upmix pcm for when listening to music. But for now I'd just love to get the 5.1 filtered properly. Thanks.

Code: Select all

#~/.asoundrc
# Bandpass plug
# this will tie everything together.
pcm.bandpass222 {
    type plug
    slave.pcm "highpass"
    hint {
        show on
        description "My Bandpass Filter"
    } 
}
# high pass filter
# remove freqs below 60hz from fronts, center, and rears
# remove freqs below 5hz from subwoofers 
pcm.highpass {
    type ladspa
    slave.pcm "lowpass";
    path "/usr/lib/ladspa";
    channels 6
    plugins {
        0 {
            label hpf
        policy none
        input.bindings.0 "Input";
        output.bindings.0 "Output";
        input {
            controls [60]
            }
        }
        1 {
        label hpf
        policy none
        input.bindings.1 "Input";
        output.bindings.1 "Output";
        input {
            controls [60]
            }
        }
        2 {
        label hpf
        policy none
        input.bindings.2 "Input";
        output.bindings.2 "Output";
        input {
            controls [60]
            }
        }
        3 {
        label hpf
        policy none
        input.bindings.3 "Input";
        output.bindings.3 "Output";
        input {
            controls [60]
            }
        }
        4 {
        label hpf
        policy none
        input.bindings.4 "Input";
        output.bindings.4 "Output";
        input {
            controls [60]
            }
        }
        5 {
        label hpf
        policy none
        input.bindings.5 "Input";
        output.bindings.5 "Output";
        input {
            controls [5]
            }
        }
    }
}
# Low pass filter
# removes freq above the higher range
# of human hearing (20,000 Hz)
# removes any freq above 300hz from the subwoofers
pcm.lowpass {
    type ladspa
    slave.pcm "hw:0,0";
    path "/usr/lib/ladspa";
    channels 6
    plugins {
        0 {
        label lpf
        policy none
        input.bindings.0 "Input";
        output.bindings.0 "Output";
        input {
            controls [20000]
            }
        }
        1 {
        label lpf
        policy none
        input.bindings.1 "Input";
        output.bindings.1 "Output";
        input {
            controls [20000]
            }
        }
        2 {
        label lpf
        policy none
        input.bindings.2 "Input";
        output.bindings.2 "Output";
        input {
            controls [20000]
            }
        }
        3 {
        label lpf
        policy none
        input.bindings.3 "Input";
        output.bindings.3 "Output";
        input {
            controls [20000]
            }
        }
        4 {
        label lpf
        policy none
        input.bindings.4 "Input";
        output.bindings.4 "Output";
        input {
        controls [20000]
            }
        }
        5 {
        label lpf
        policy none
        input.bindings.5 "Input";
        output.bindings.5 "Output";
        input {
            controls [300]
            }
        }
    }
}

[urhaxable]

Ok, seems like I have the bandpass high and low working properly now, but I only have front left and front right working, i rewrote my .asoundrc from scratch and tried a few different pcm but still get just stereo. Here is my current .asoundrc with high/low bandpass working with stereo even when playing 5.1 movie:

Code: Select all

pcm.bandpass51 {
    type plug
    slave.pcm "pluglphp"
}

pcm.pluglphp {
    type ladspa
    #slave.pcm "plughw:0,0" #works with stereo
    #slave.pcm "surround51" #doesnt work at all
    slave.pcm "orig51" #works with stereo
    path "/usr/lib/ladspa"
    channels 6
    plugins {
        0 {
            label lpf
            id 1041
            policy none
            input.bindings.0 "Input";
            output.bindings.0 "Output";
            input {
                controls [ 20000 ]
            }
        }
        1 {
            label lpf
            id 1041
            policy none
            input.bindings.1 "Input";
            output.bindings.1 "Output";
            input {
                controls [ 20000 ]
            }
        }
        2 {
            label lpf
            id 1041
            policy none
            input.bindings.2 "Input";
            output.bindings.2 "Output";
            input {
                controls [ 20000 ]
            }
        }
        3 {
            label lpf
            id 1041
            policy none
            input.bindings.3 "Input";
            output.bindings.3 "Output";
            input {
                controls [ 20000 ]
            }
        }
        4 {
            label lpf
            id 1041
            policy none
            input.bindings.4 "Input";
            output.bindings.4 "Output";
            input {
                controls [ 20000 ]
            }
        }
        5 {
            label lpf
            id 1041
            policy none
            input.bindings.5 "Input";
            output.bindings.5 "Output";
            input {
                controls [ 300 ]
            }
        }
        6 {
            label hpf
            id 1042
            policy none
            input.bindings.0 "Input";
            output.bindings.0 "Output";
            input {
                controls [ 60 ]
            }
        }
        7 {
            label hpf
            id 1042
            policy none
            input.bindings.1 "Input";
            output.bindings.1 "Output";
            input {
                controls [ 60 ]
            }
        }
        8 {
            label hpf
            id 1042
            policy none
            input.bindings.2 "Input";
            output.bindings.2 "Output";
            input {
                controls [ 60 ]
            }
        }
        9 {
            label hpf
            id 1042
            policy none
            input.bindings.3 "Input";
            output.bindings.3 "Output";
            input {
                controls [ 60 ]
            }
        }
        10 {
            label hpf
            id 1042
            policy none
            input.bindings.4 "Input";
            output.bindings.4 "Output";
            input {
                controls [ 60 ]
            }
        }
        11 {
            label hpf
            id 1042
            policy none
            input.bindings.5 "Input";
            output.bindings.5 "Output";
            input {
                controls [ 5 ]
            }
        }
    }
}
pcm.orig51 {
    type plug
    slave.pcm surround51 #still gives stereo
    slave.channels 6
}

If I remove he orig51 and the uncomment the plughw and comment the orig slave I still get same results, if i call surround51 as slave within the pluglphp I get no sound, so I had to call surround51 separate using orig51. Anyone see what I'm doing wrong that I'm not getting 5.1 audio using this config?

I'm using this for testing:

Code: Select all

mplayer -ao alsa:device=bandpass51 /home/brandon/Linux-Data/Videos/Test/Dolby-Atmos-Demonstration-2014-1080p-AVC-TrueHD-7.1/BDMV/STREAM/00020.m2ts -aid 2