fs.createReadStream('b.mp3')减少延迟
问题描述:
我正在玩触发声音(500毫秒长)的事件,因此我使用lame
库。fs.createReadStream('b.mp3')减少延迟
var lame = require('lame');
var fs = require('fs');
var Speaker = require('speaker');
while(listening) {
if(eventIsFired) {
fs.createReadStream('b.mp3')
.pipe(new lame.Decoder)
.pipe(new Speaker);
}
}
有什么办法预加载流/文件,所以我不需要在每一个事件上加载它?它实际上阻止了我的整个while循环并使其异步无效。我该如何减少延迟并提高效率?
答
您可以将mp3文件缓存到buffer
,然后在需要时将buffer
转换为可读流。
var lame = require('lame');
var fs = require('fs');
var Speaker = require('speaker');
var Readable = require('stream').Readable;
var mp3Buffer = fs.readFileSync('b.mp3');
while(listening) {
if(eventIsFired) {
bufferToReadableStream(mp3Buffer)
.pipe(new lame.Decoder)
.pipe(new Speaker);
}
}
function bufferToReadableStream(buffer) {
let stream = new Readable();
stream.push(buffer);
stream.push(null);
return stream;
}