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【已解决】getUserMedia后用MediaRecorder去获取麦克风录音数据

JS crifan 520浏览 0评论

折腾:

【已解决】web端html+js中如何调用麦克风获取用户语音输入说话

期间,试了半天AudioContext,没搞定。

所以去试试这个看起来更不错的:MediaRecorder

用代码:

    function testMediaRecorder(mediaStream){

        console.log("testMediaRecorder: mediaStream=%o", mediaStream);

        const options = {mimeType: ‘video/webm;codecs=vp9’};

        const recordedChunks = [];

        const mediaRecorder = new MediaRecorder(mediaStream, options);

        console.log("mediaRecorder=%o", mediaRecorder);

        mediaRecorder.addEventListener(‘dataavailable’, function(e) {

            console.log("dataavailable: e.data.size=%d, e.data=%o", e.data.size, e.data);

            if (e.data.size > 0) {

                recordedChunks.push(e.data);

                console.log("recordedChunks=%o", recordedChunks);

            }

            if (shouldStop === true && stopped === false) {

                mediaRecorder.stop();

                stopped = true;

                console.log("stopped=%s", stopped);

            }

        });

        mediaRecorder.addEventListener(‘stop’, function() {

            // downloadLink.href = URL.createObjectURL(new Blob(recordedChunks));

            // downloadLink.download = ‘acetest.wav’;

            var blobFile = URL.createObjectURL(new Blob(recordedChunks));

            console.log("blobFile=%o", blobFile);

            $("#downloadSpeakAudio").attr("href", speakAudioFilename);

            var curDate = new Date();

            console.log("curDate=%o", curDate);

            var curDatetimeStr = curDate.Format("yyyyMMdd_HHmmss");

            console.log("curDatetimeStr=%o", curDatetimeStr);

            var speakAudioFilename = curDatetimeStr + ".wav"

            console.log("speakAudioFilename=%o", speakAudioFilename);

            $("#downloadSpeakAudio").attr("download", speakAudioFilename);

        });

        mediaRecorder.start();

    }

结果:

虽然弹框请求访问麦克风:

但是搞了半天,MediaRecorder dataavailable没有执行啊:

【已解决】html5中MediaRecorder的dataavailable没有执行获取不到录音数据

【总结】

至此,已经可以用代码:

    function testMediaRecorder(mediaStream){

        console.log("testMediaRecorder: mediaStream=%o", mediaStream);

        const options = {

            mimeType: ‘audio/webm’,

            audioBitsPerSecond : 128000, //128Kbit/s

        };

        if (MediaRecorder.isTypeSupported(options.mimeType)) {

            console.log("support options=%o", options);

        } else {

            console.log(options.mimeType + ‘ is not Supported’);

        }

        const mediaRecorder = new MediaRecorder(mediaStream, options);

        console.log("mediaRecorder=%o", mediaRecorder);

        mediaRecorder.addEventListener(‘dataavailable’, function(e) {

            console.log("dataavailable: e.data.size=%d, e.data=%o", e.data.size, e.data);

            var inputAudio = document.getElementById(‘inputAudio’);

            console.log("inputAudio=o", inputAudio);

            // e.data contains a blob representing the recording

            var recordedBlob = e.data;

            console.log("recordedBlob=o", recordedBlob);

            inputAudio.src = URL.createObjectURL(recordedBlob);

            console.log("inputAudio.src=%o", inputAudio.src);

            inputAudio.load();

            inputAudio.play();

        });

        $( "#stopSpeak" ).on( "click", function() {

            console.log("#stopSpeak clicked");

            mediaRecorder.stop();

        });

        console.log("before start: mediaRecorder.state=%s", mediaRecorder.state);

        mediaRecorder.start();

        console.log("after  start: mediaRecorder.state=%s", mediaRecorder.state);

    }

    function onSuccessGetUserMedia(mediaStream) {

        console.log("handleSuccess: mediaStream=%o", mediaStream);

        testMediaRecorder(mediaStream);

    }

    function testAudioInput(){

        console.log("testAudioInput");

        navigator.mediaDevices

            .getUserMedia({ audio: true, video: false })

            .then(onSuccessGetUserMedia)

            .catch(function (error) {

                console.log("Try get audio input error: %o", error);

                //DOMException: Permission denied

            });

    }

    testAudioInput();

获取到录音数据并用audio播放了。

转载请注明:在路上 » 【已解决】getUserMedia后用MediaRecorder去获取麦克风录音数据

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