javascript原生调用摄像头

HTML

 <!DOCTYPE html>

 <html>

 <head>

   <meta charset="utf-8">

   <meta name="viewport" content="width=device-width">

   <title>recorded</title>

 </head>

 <body>

     <video id="gum" autoplay muted></video>

     <video id="recorded" autoplay loop></video>

     <div>

       <button id="opencamera">Open camera</button>

       <button id="record" disabled>Start Recording</button>

       <button id="play" disabled>Play</button>

       <button id="download" disabled>Download</button>

     </div>

 </body>

 </html>

JavaScript

'use strict';

var mediaRecorder;

var recordedBlobs;

var gumVideo = document.querySelector('video#gum');

var recordedVideo = document.querySelector('video#recorded');

var recordButton = document.querySelector('button#record');

var playButton = document.querySelector('button#play');

var downloadButton = document.querySelector('button#download');

recordButton.onclick = toggleRecording;

playButton.onclick = play;

downloadButton.onclick = download;

var isSecureOrigin = location.protocol === 'https:' ||

location.hostname === 'localhost';

if (!isSecureOrigin) {

  alert('getUserMedia() must be run from a secure origin: HTTPS or localhost.' +

    '\n\nChanging protocol to HTTPS');

  location.protocol = 'HTTPS';

}

var constraints = {

  audio: true,

  video: true

};

function handleSuccess(stream) {

  recordButton.disabled = false;

  console.log('getUserMedia() got stream: ', stream);

  window.stream = stream;

  if (window.URL) {

    gumVideo.src = window.URL.createObjectURL(stream);

  } else {

    gumVideo.src = stream;

  }

}

function handleError(error) {

  console.log('navigator.getUserMedia error: ', error);

}

document.querySelector('#opencamera').onclick = function(){

  this.disabled = true;

  navigator.mediaDevices.getUserMedia(constraints).

    then(handleSuccess).catch(handleError);

};

recordedVideo.addEventListener('error', function(ev) {

  console.error('MediaRecording.recordedMedia.error()');

  alert('Your browser can not play\n\n' + recordedVideo.src

    + '\n\n media clip. event: ' + JSON.stringify(ev));

}, true);

function handleDataAvailable(event) {

  if (event.data && event.data.size > 0) {

    recordedBlobs.push(event.data);

  }

}

function handleStop(event) {

  console.log('Recorder stopped: ', event);

}

function toggleRecording() {

  if (recordButton.textContent === 'Start Recording') {

    startRecording();

  } else {

    stopRecording();

    recordButton.textContent = 'Start Recording';

    playButton.disabled = false;

    downloadButton.disabled = false;

  }

}

function startRecording() {

  recordedBlobs = [];

  var options = {mimeType: 'video/webm;codecs=vp9'};

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

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

    options = {mimeType: 'video/webm;codecs=vp8'};

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

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

      options = {mimeType: 'video/webm'};

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

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

        options = {mimeType: ''};

      }

    }

  }

  try {

    mediaRecorder = new MediaRecorder(window.stream, options);

  } catch (e) {

    console.error('Exception while creating MediaRecorder: ' + e);

    alert('Exception while creating MediaRecorder: '

      + e + '. mimeType: ' + options.mimeType);

    return;

  }

  console.log('Created MediaRecorder', mediaRecorder, 'with options', options);

  recordButton.textContent = 'Stop Recording';

  playButton.disabled = true;

  downloadButton.disabled = true;

  mediaRecorder.onstop = handleStop;

  mediaRecorder.ondataavailable = handleDataAvailable;

  mediaRecorder.start(10); // collect 10ms of data

  console.log('MediaRecorder started', mediaRecorder);

}

function stopRecording() {

  mediaRecorder.stop();

  console.log('Recorded Blobs: ', recordedBlobs);

  recordedVideo.controls = true;

}

function play() {

  var superBuffer = new Blob(recordedBlobs, {type: 'video/webm'});

  recordedVideo.src = window.URL.createObjectURL(superBuffer);

}

function download() {

  var blob = new Blob(recordedBlobs, {type: 'video/webm'});

  var url = window.URL.createObjectURL(blob);

  var a = document.createElement('a');

  a.style.display = 'none';

  a.href = url;

  a.download = 'test.webm';

  document.body.appendChild(a);

  a.click();

  setTimeout(function() {

    document.body.removeChild(a);

    window.URL.revokeObjectURL(url);

  }, 100);

}

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javascript原生调用摄像头

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