android-cloud-H5/screenIos/decoder.js

var isFinish = false;
var decodeCount = 0;
var h264Queue = [];
var isFirst = true;
var ret = ''
var parameters = GetRequest();
var videoWidth = parameters['width'];
var videoHeight = parameters['height'];
self.Module = {
  onRuntimeInitialized: function () {
    ret = Module._openDecoder(videoWidth, videoHeight);
    if (!ret) {
      isFinish = true;
    }
  }
};

self.importScripts("ffmpeghelper.js");

self.addEventListener('message', function (e) {
  h264Queue.push(e.data);
}, false);

function PrintfLog(str) {
  var curTime = new Date().getTime();
  var objData = {
    cmd: 0,
    data: str,
    time: curTime
  };
  self.postMessage(objData);
}

setInterval(
  function () {
    if (h264Queue.length > 0 && isFinish) {
      if (isFirst) {
        PrintfLog("当前队列大小 :" + h264Queue.length);
        isFirst = false;
      }

      if (h264Queue.length > 10 && isFinish) {
        PrintfLog("解不过来 " + h264Queue.length);
        return;
      }

      decodeH264(h264Queue.shift());
    }
  }, 1);


function decodeH264(data) {
  var size = videoWidth * videoHeight *3;
  var retPtr = Module._malloc(size); //接收的数据
  var inputPtr = Module._malloc(data.length); //输入数据

  for (var i = 0; i < data.length; i++) {
    Module.HEAPU8[(inputPtr) + i] = data[i]; //转换为堆数据
  }

  var time = new Date().getTime();
  var ret = Module._feedData(inputPtr, data.length, retPtr);

  if (ret >= 0) {
    if (decodeCount > 50) {
      var curCost = new Date().getTime() - time;
      PrintfLog("解码耗时 " + curCost + " ms");
      decodeCount = 0;
    }
    decodeCount++;
  }

  var yuvData = new Uint8Array(size);
  for (var i = 0; i < yuvData.length; i++) {
    yuvData[i] = Module.HEAPU8[(retPtr) + i];
  }

  var curTime = new Date().getTime();
  var objData = {
    cmd: 1,
    data: yuvData,
    time: curTime
  };
  self.postMessage(objData);
  Module._free(inputPtr);
  Module._free(retPtr);
}


function closeDecoder() {
  Module._destroyDecoder();
}

// 获取url中"?"符后的字串
function GetRequest() {
  var url = location.search;
  var obj = new Object();
  if (url.indexOf("?") != -1) {
    var str = url.substring(1);
    strs = str.split("&");
    for (var i = 0; i < strs.length; i++) {
      obj[strs[i].split("=")[0]] = (strs[i].split("=")[1]);
    }
  }
  return obj;
}