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webvoice

v0.0.4

Published

a web voice solution for browser

Vulnerabilities

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Links

Git

Maintainers

dehaidehai

Keywords

audiowebvoice

Readme

webvoice

一个网页语音对讲库。

使用

npm install webvoice --save

设计

采集

  1. 通过MediaDevices.getUserMedia()进行语音采集
  2. 需要在https的环境下调用
  3. 把麦克风数据塞给 MediaStreamAudioSourceNode

编码

  1. 建立ScriptProcessNode处理节点
  2. 把建立的 MediaStreamAudioSourceNode 连接到 ScriptProcessNode 然后连接到 AudioContext.destination
  3. 在ScriptProcessNode的 onaudioprocess 事件中处理 Buffer
  4. 把 Buffer 进行压缩和 wav 编码

传输

  1. 通过websocket加密方式进行传输

处理

  1. 任意后台进行数据处理 node/java/c#/c++
  2. 然后转发到目的地
  3. 把结果通过websocket发送出来

接收

  1. 通过websocket进行接收

解码

  1. 通过 AudioContext 的 decodeAudioData 方法对 wav 格式音频文件解码

播放

  1. 构建AudioBufferSourceNode节点
  2. 连接到 AudioContext.destination 并进行播放

Document

API

音频格式浏览器支持情况

|内容\浏览器|Chrome|IE|FireFox|Safari|Opera| |---|---|---|---|---|---| |<audio>|4.0|9.0|3.5|4.0|10.5| |mp3|Y|Y|Y|Y|Y| |wav|Y|N|Y|Y|Y| |ogg|Y|N|Y|N|Y|

媒体类型

|文件类型|媒体类型|文件大小| |---|---|---| |mp3|audio/mpeg|| |ogg|audio/ogg|| |wav|audio/wav|1B=取样频率x量化位数x声道x时间/8|

声音参数

|类型|值范围| |---|---| |量化位数|8位、16位、24位| |取样频率|11025Hz(11kHz)、22050Hz(22kHz)、44100Hz(44kHz)| |声道|单声道(nx1矩阵点)、立体声(nx2矩阵点)|

参考资料

网页音频接口的基本概念