javascript - Firefox createMediaStreamDestination bug using rtc? -

i stream audio on rtc , want mute , unmute audio.

this works... no gain control:

function(stream) { /* getusermedia stream */       console.log("access granted audio/video");       peer_connection.addstream(stream); } 

this works on chrome not on firefox (with gain control)

function(stream) { /* getusermedia stream */   console.log("access granted audio/video");   var microphone = context.createmediastreamsource(stream);   gainnode = context.creategain();   var dest = context.createmediastreamdestination();   microphone.connect(gainnode);   gainnode.connect(dest);    local_media_stream = dest.stream;   peer_connection.addstream(local_media_stream); } 

i no error , hear no voice. when send gainnode context.destination can hear myself.

i think "context.createmediastreamsource(stream)" broken in way. can tell me why ? , how fix this.

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edit: checked streams and:

stream //type: localmediastream     dest.steam //type: mediastream 

in firefox! in chrome both mediastreams

to mute audio can enable/disable track doing:

stream.getaudiotracks()[0].enabled = false;  // mutes 

this won't solve problem gain node, bug/limitation in firefox @ moment (in case can wait fix). if purpose (un)mute should work (it works video tracks).