代码片段

let recorder = wx.getRecorderManager()

const audioCtx = wx.createWebAudioContext()

const analyser = audioCtx.createAnalyser();

recorder.onFrameRecorded(listener => {

    if (listener.isLastFrame) {

        console.log('soundIntensity',0)

    } else {

        audioCtx.decodeAudioData(listener.frameBuffer, buffer => {

            let source = audioCtx.createBufferSource()

            source.buffer = buffer

            source.connect(analyser)

            source.start()

            let n = new Uint8Array(analyser.frequencyBinCount)

            analyser.getByteTimeDomainData(n)

            let i = 0, r = 0, s = 0

            r = Math.max.apply(null, n)

            s = Math.min.apply(null, n)

            i = (r - s) / 128

            i = Math.round(i * 100 / 2)

            i = i > 100 ? 100 : i

            console.log('soundIntensity', listener.isLastFrame ? 0 : i)

        }, err => {

        console.error('decodeAudioData fail', err)

        })

    }

})


recorder.start({

    duration: 1000,

    sampleRate: 16000, //采样率

    numberOfChannels: 1, //录音通道数

    encodeBitRate: 96000, //编码码率

    format: 'mp3', //音频格式，有效值 aac/mp3

    frameSize: 1

})