问题描述
参考:
目前,我正在OS 10.9.2上运行Chrome 34.0.1847.116并尝试使用Web Midi API。启用chrome:// flags /#enable-web-midi后,我可以通过粘贴以下代码来获取midiAccess对象:进入DevTools控制台。
I'm currently running Chrome 34.0.1847.116 on OS 10.9.2 and experimenting with the Web Midi API. After enabling chrome://flags/#enable-web-midi, I'm able to get a midiAccess object by pasting the following code from http://www.w3.org/TR/webmidi/ into the DevTools console.
var midi = null; // global MIDIAccess object
function onMIDISuccess( midiAccess ) {
console.log( "MIDI ready!" );
midi = midiAccess; // store in the global (in real usage, would probably keep in an object instance)
}
function onMIDIFailure(msg) {
console.log( "Failed to get MIDI access - " + msg );
}
navigator.requestMIDIAccess().then( onMIDISuccess, onMIDIFailure );
当我查询midi.inputs()和midi.outputs()时,返回的列表仅包含IAC总线设备。我的midi键盘(连接Turtle Beach USB midi适配器)没有出现。在试图诊断问题时,我到目前为止发现了以下内容:
When I query midi.inputs() and midi.outputs(), the returned list contains only IAC Bus devices. My midi keyboard (connected with a Turtle Beach USB midi adapter) does not show up. In trying to diagnose the problem, I've so far found the following:
- 适配器在OS X的Audio / Midi安装程序中可见并且键盘可以正确使用Logic Pro以及自制CoreMidi代码。
- Web合成器示例也无法找到键盘,并且在按键时不发声。
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