arraybuffer | 易学教程

Convert base64 string to ArrayBuffer

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问题 I need to convert a base64 encode string into an ArrayBuffer. The base64 strings are user input, they will be copy and pasted from an email, so they\'re not there when the page is loaded. I would like to do this in javascript without making an ajax call to the server if possible. I found those links interesting, but they didt\'n help me: ArrayBuffer to base64 encoded string this is about the opposite conversion, from ArrayBuffer to base64, not the other way round http://jsperf.com/json-vs

Convert a binary NodeJS Buffer to JavaScript ArrayBuffer

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问题 How can I convert a NodeJS binary buffer into a JavaScript ArrayBuffer? 回答1: Instances of Buffer are also instances of Uint8Array in node.js 4.x and higher. Thus, the most efficient solution is to access the buf.buffer property directly, as per https://stackoverflow.com/a/31394257/1375574. The Buffer constructor also takes an ArrayBufferView argument if you need to go the other direction. Note that this will not create a copy, which means that writes to any ArrayBufferView will write through

ArrayBuffer to base64 encoded string

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问题 I need an efficient (read native) way to convert an ArrayBuffer to a base64 string which needs to be used on a multipart post. 回答1: function _arrayBufferToBase64( buffer ) { var binary = ''; var bytes = new Uint8Array( buffer ); var len = bytes.byteLength; for (var i = 0; i < len; i++) { binary += String.fromCharCode( bytes[ i ] ); } return window.btoa( binary ); } but, non-native implementations are faster e.g. https://gist.github.com/958841 see http://jsperf.com/encoding-xhr-image-data/6

Converting between strings and ArrayBuffers

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问题 Is there a commonly accepted technique for efficiently converting JavaScript strings to ArrayBuffers and vice-versa? Specifically, I\'d like to be able to write the contents of an ArrayBuffer to localStorage and to read it back. 回答1: Update 2016 - five years on there are now new methods in the specs (see support below) to convert between strings and typed arrays using proper encoding. TextEncoder The TextEncoder represents: The TextEncoder interface represents an encoder for a specific method

H5音视频方面的总结

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H5音视频方面的总结前言 recorder.js 视频直播：Flv.js 前言最近因为公司的项目要求，接触到了前端H5视频直播和实时语音识别这块的内容，由于我们项目的人都是第一次接触，开发的过程中踩了不少的坑，好在最后加班加点的还是完成了任务，所以写下这篇博客总结一下这次开发过程中的一些不足和收获。 recorder.js 实时语音这块使用的是 recorder.js .使用了navigator.mediaDevices.getUserMedia来调取设备的麦克风，当开始录音后，浏览器会不断的触发onaudioprocess，在这个函数中可以获取到音频数据，然后再对获取到的音频数据进行转码，最终转成ArrayBuffer格式的字节数组。 recorder.js最后生成的是一个mp3文件，可以直接在页面上播放，但项目中的需求是利用websocket将音频数据实时的传输给后台，后台调用讯飞接口再实时生成文字返回给前端页面。所以需要生成arraybuffer来传给后台，并且采样率和采样数位需要设置成： config . sampleBits = 16 //config.sampleBits || 8 采样数位 8, 16 config . sampleRate = 16000 //采样率(1/6 44100) 这样讯飞才能准确的识别出来，不然识别出来的错误率会非常高。