问题
I have an audio device with 4 inputs microphones..
Someone knows if i can use all these inputs with Web audio API ?
Thanks !
回答1:
It should work by calling getUserMedia four times, choosing a different device each time, and using createMediaStreamSource four times, although I haven't tested.
回答2:
yes,you can list all input devices and select one to use.
<html><body>
<select id="devices_list"></select>
<script>
function devices_list(){
var handleMediaSourcesList = function(list){
for(i=0;i<list.length;i++){
var device= list[i];
if(device.kind == 'audioinput') {
document.querySelector('#devices_list').options.add(new Option(device.label ,device.deviceId));
}
}
}
if (navigator["mediaDevices"] && navigator["mediaDevices"]["enumerateDevices"])
{
navigator["mediaDevices"]["enumerateDevices"]().then(handleMediaSourcesList);
}
// Old style API
else if (window["MediaStreamTrack"] && window["MediaStreamTrack"]["getSources"])
{
window["MediaStreamTrack"]["getSources"](handleMediaSourcesList);
}
}
function usemic(){
navigator.getUserMedia ({
"audio":{
"optional": [{
"sourceId": document.querySelector('#devices_list').value
}]
}}, function (stream) {
//...some code to use stream from mic
},function(err){
debuginfo('getMedia ERR:'+err.message );
});
}
</script>
</body></html>
来源：https://stackoverflow.com/questions/27433904/web-audio-api-and-multiple-inputs-mic-device