android-cloud-H5/screenIos/decoder.js

var isFinish = false;
var decodeCount = 0;
var h264Queue = [];
var isFirst = true;
var parameters = GetRequest();
var deviceBoard = parameters['deviceBoard'];
var videoWidth = deviceBoard.substring(0, 2) === 'MTK' ? 1080 : 720
var videoHeight = deviceBoard.substring(0, 2) === 'MTK' ? 1920 : 1280

var ret = ''
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.substr(1);
		strs = str.split("&");
		for (var i = 0; i < strs.length; i++) {
			obj[strs[i].split("=")[0]] = (strs[i].split("=")[1]);
		}
	}
	return obj;
}