Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.javascript > #35697

Re: What happened to the web midi api?

Show all headers | View raw

In article <2ca2fbcc-8f70-4920-9527-5a6c2255495b@googlegroups.com>,
Jonas Thörnvall  <jonas.thornvall@gmail.com> wrote:
> 
> Here i build message and send to change midichannel
> 
> function sendMidiChannel(){
>     //Set midichannel on the track
>     channelC=document.getElementById("out_channel").selectedIndex+1;
>     if (channelC==1) {NOTE_ON=0x90; NOTE_OFF=0x80;}
>     else if (channelC==2) {NOTE_ON=0x91; NOTE_OFF=0x81;}
>     else if (channelC==3) {NOTE_ON=0x92;NOTE_OFF=0x82;}
>     else if (channelC==4) {NOTE_ON=0x93;NOTE_OFF=0x83;}
>     else if (channelC==5) {NOTE_ON=0x94;NOTE_OFF=0x84;}
>     else if (channelC==6) {NOTE_ON=0x95;NOTE_OFF=0x85;}
>     else if (channelC==7) {NOTE_ON=0x96;NOTE_OFF=0x86;}
>     else if (channelC==8) {NOTE_ON=0x97;NOTE_OFF=0x87;}
>     else if (channelC==9) {NOTE_ON=0x98;NOTE_OFF=0x88;}
>     else if (channelC==10) {NOTE_ON=0x99;NOTE_OFF=0x89;}
>     else if (channelC==11) {NOTE_ON=0xA0;NOTE_OFF=0x8A;}
>     else if (channelC==12) {NOTE_ON=0xA1;NOTE_OFF=0x8B;}
>     else if (channelC==13) {NOTE_ON=0xA2;NOTE_OFF=0x8C;}
>     else if (channelC==14) {NOTE_ON=0xA3;NOTE_OFF=0x8D;}
>     else if (channelC==15) {NOTE_ON=0xA4;NOTE_OFF=0x8E;}
>     else if (channelC==16) {NOTE_ON=0xA5;NOTE_OFF=0x8F;}
> }

Hi Jonas, it looks like you have the NOTE_ON values wrong for channels 11-16.

But you can do it more efficiently like this, instead of all those ifs:

function sendMidiChannel(){
    //Set midichannel on the track
    var channelC=document.getElementById("out_channel").selectedIndex; // don't need +1 here
    if (channelC >= 0 && channelC < 16) {
        NOTE_ON = 0x90 + channelC;
        NOTE_OFF = 0x80 + channelC;
    }
}

Cheers
Tony
-- 
Tony Mountifield
Work: tony@softins.co.uk - http://www.softins.co.uk
Play: tony@mountifield.org - http://tony.mountifield.org

Back to comp.lang.javascript | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

What happened to the web midi api? Jonas Thörnvall <jonas.thornvall@gmail.com> - 2018-09-11 08:56 -0700
  Re: What happened to the web midi api? Jonas Thörnvall <jonas.thornvall@gmail.com> - 2018-09-11 10:26 -0700
  Re: What happened to the web midi api? moltenvoltage@gmail.com - 2018-09-26 01:39 -0700
    Re: What happened to the web midi api? Jonas Thörnvall <jonas.thornvall@gmail.com> - 2018-09-26 02:18 -0700
      Re: What happened to the web midi api? tony@mountifield.org (Tony Mountifield) - 2018-09-26 10:34 +0000
        Re: What happened to the web midi api? Jonas Thörnvall <jonas.thornvall@gmail.com> - 2018-09-26 04:27 -0700
          Re: What happened to the web midi api? Jonas Thörnvall <jonas.thornvall@gmail.com> - 2018-09-26 13:55 -0700
            Re: What happened to the web midi api? Jonas Thörnvall <jonas.thornvall@gmail.com> - 2018-09-26 14:23 -0700
              Re: What happened to the web midi api? Jonas Thörnvall <jonas.thornvall@gmail.com> - 2018-09-26 14:56 -0700
                Re: What happened to the web midi api? Jonas Thörnvall <jonas.thornvall@gmail.com> - 2018-09-26 15:06 -0700
    Re: What happened to the web midi api? Jonas Thörnvall <jonas.thornvall@gmail.com> - 2018-09-26 03:22 -0700

csiph-web