Question

我正在使用HTML Media Capture和while(scanf("%s %d%d",&znak,&X,&Y)!=EOF){ if(znak=='+'){ if(index==number){ size_t newnum = (number + 2) * 2; int **tmp=(int **)realloc(ponuka, newnum * sizeof(*ponuka)); number=newnum; ponuka=tmp; } // allocating array ponuka[index]=(int *)malloc(2 * sizeof ( int )); // 2nd dimension ponuka[index][0]=X; ponuka[index][1]=Y; index++; } else{ int first=1; int match=0; int bestDeal; int tmp; for (i = ass; i < index; i++){ if(ponuka[i][0]==X && ponuka[i][1]<=Y && ponuka[i][1]>0){ if(first){tmp=ponuka[i][1];} if(ponuka[i][1]<=tmp){ tmp=ponuka[i][1]; bestDeal=i; } // found match and assign index into variable;; match=1; } } int gg=ponuka[bestDeal]; ponuka[bestDeal]=ponuka[0]; ponuka[0]=gg; ass++; // trying to swap values and incrementing looping so matches values will be at start and loop wont go through them } } }方法。它不能与Chrome一起使用，我会在失败时收到警报。

以下是我使用的示例代码：

getUserMedia

Answer 1

Chrome无法识别标准的navigator.getUserMedia。它适用于Microsoft Edge。您需要添加供应商前缀。对于Chrome：navigator.webkitGetUserMedia

这是JSFiddle的工作代码 https://jsfiddle.net/RamiSarieddine/t9d3hpyr/

//browser support check "ms" vendor function is for IE8
navigator.getUserMedia = ( navigator.getUserMedia       ||
                           navigator.webkitGetUserMedia ||
                           navigator.mozGetUserMedia    ||
                           navigator.msGetUserMedia );

if (navigator.getUserMedia) {
    navigator.getUserMedia(
        // constraints
        {
            video: true,
            audio: true
        },
        // successCallback
        function (localMediaStream) {
            var video = document.querySelector('video');
            video.src = window.URL.createObjectURL(localMediaStream);
            // Do something with the video
            video.play();
        },
        // errorCallback
        function (err) {
            console.log("The following error occured: " + err);
        }
    );
} else {
    alert("getUserMedia not supported by your web browser or Operating system version");
}

Answer 2

navigator.getUserMedia已被navigator.mediaDevices.getUserMedia取代。

后者使用现代承诺，可在Edge，Firefox和Chrome中本地使用。还有adapter.js官方WebRTC polyfill可以帮助他们达到标准（例如srcObject）。

这是一个适用于所有三个方面的小提琴：https://jsfiddle.net/srn9db4h/

var constraints = { video: true, audio: true };

navigator.mediaDevices.getUserMedia(constraints)
  .then(stream => video.srcObject = stream)
  .catch(e => console.error(e));

Answer 3

无法使用Chrome

尝试使用webkit，moz前缀，请参阅Navigator.getUserMedia()

navigator.getUserMedia = navigator.getUserMedia ||
                         navigator.webkitGetUserMedia ||
                         navigator.mozGetUserMedia; 
if (navigator.getUserMedia) {
    //do stuff
}

Answer 4

这个小验证怎么样？

async getMediaStream(constraints): Promise<MediaStream> {
  return new Promise(function (resolve, reject) {
    if (navigator.mediaDevices
      && navigator.mediaDevices.getUserMedia) {
        navigator.mediaDevices.getUserMedia(constraints)
        .then((stream) => resolve(stream))
        .catch(err => reject(err));
    } else {
      const getUserMedia = navigator.getUserMedia
      || navigator['webkitGetUserMedia']
      || navigator['mozGetUserMedia']
      || navigator['msGetUserMedia'];
      getUserMedia(
        constraints,
        (stream) => resolve(stream),
        (err) => reject(err)
      );
    }
  });
}

const isEdge = navigator.userAgent.indexOf('Edge') !== -1
  && (!!navigator.msSaveOrOpenBlob || !!navigator.msSaveBlob);

getMediaStream({
  audio: isEdge ? true : {
    echoCancellation: false
  }
})
.then(stream => console.log(stream))
.catch(err => console.error(err))

关于，尼科尔斯：）

getUserMedia不适用于新浏览器

4 个答案: