HTML5兼容HEVC视频格式且支持本地绝对路径访问的操作方法_html5

通过potplayer发现该mp4文件的编码格式为hevc，而video标签不支持该编码格式的视频文件

在html文件中首先需要引用libe265.js来负责处理hevc格式文件

libde265.js/libde265.js at master · strukturag/libde265.js · github

<!doctype html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <meta http-equiv="x-ua-compatible" content="ie=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>document</title>
</head>
<body>
    <canvas id="canvas"></canvas>
    <script src="./libde265.js"></script>  
    <script>  
    var video_url = 'http://localhost/file/video?filename=e:\\test\\1_monitor01_1668690540000.mp4'  
    var video = document.getelementbyid('canvas')  
     // var fpswrap = document.queryselector('.hevc-fps')
      var status = document.queryselector('.hevc-status')
      var playback = function (event) {
        // event.preventdefault()
        // if (player) {
        //   player.stop()
        // }
        player = new libde265.rawplayer(video)
        player.set_status_callback(function (msg, fps) {
          player.disable_filters(true)
          console.log(msg);
          switch (msg) {
            case 'loading':
              status.innerhtml = 'loading movie...'
              break
            case 'initializing':
              status.innerhtml = 'initializing...'
              break
            case 'playing':
              status.innerhtml = 'playing...'
              break
            case 'stopped':
              status.innerhtml = 'stopped'
              break
            case 'fps':
              // fpswrap.innerhtml = number(fps).tofixed(2) + ' fps'
              break
            default:
              status.innerhtml = msg
          }
        })
        player.playback(video_url)
      }
      playback()
    </script>  
</body>
</html>

而通过绝对路径来寻找本地视频文件则可通过后端（springboot）编写接口进行操作

以下是controller层代码

@restcontroller
@requestmapping("/file")
@crossorigin(origins = "*")
public class filecontroller {
    @resource
    public ifileservice fileservice;
    /**
     * 根据本地图片全路径，响应给浏览器1个图片流
     */
    @getmapping("/image/{filename}")
    public void showimage(httpservletresponse response, @pathvariable("filename") string filename) {
        fileservice.show(response, filename, "image");
    }
    /**
     * 根据本地视频全路径，响应给浏览器1个视频
     */
    @getmapping ("/video")
    public void showvideo(httpservletresponse response, string filename) {
        fileservice.show(response, filename, "video");
    }
}

以下是sevice层代码

@service
public class fileserviceimpl implements ifileservice {
    /**
     * 响应文件
     *
     * @param response
     * @param filename 文件全路径
     * @param type     响应流类型
     */
    public void show(httpservletresponse response, string filename, string type) {
        try {
            fileinputstream fis = new fileinputstream(filename); // 以byte流的方式打开文件
            int i = fis.available(); //得到文件大小
            byte data[] = new byte[i];
            fis.read(data);  //读数据
            response.setcontenttype(type + "/*"); //设置返回的文件类型
            outputstream toclient = response.getoutputstream(); //得到向客户端输出二进制数据的对象
            toclient.write(data);  //输出数据
            toclient.flush();
            toclient.close();
            fis.close();
        } catch (clientabortexception cae) {
            cae.printstacktrace();
            system.out.println("播放中断");
        } catch (exception e) {
            e.printstacktrace();
            system.out.println("文件不存在");
        }
    }
}

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