621 lines
23 KiB
JavaScript
621 lines
23 KiB
JavaScript
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/**
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* Created by wangweijie5 on 2016/12/5.
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*/
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(function (event) {
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const AUDIO_TYPE = 0; // 音频
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const VIDEO_TYPE = 1; // 视频
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const PRIVT_TYPE = 2; // 私有帧
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const PLAYM4_AUDIO_FRAME = 100; // 音频帧
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const PLAYM4_VIDEO_FRAME = 101; // 视频帧
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const PLAYM4_OK = 1;
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const PLAYM4_ORDER_ERROR = 2;
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const PLAYM4_DECODE_ERROR = 44 // 解码失败
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const PLAYM4_NOT_KEYFRAME = 48; // 非关键帧
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const PLAYM4_NEED_MORE_DATA = 31; // 需要更多数据才能解析
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const PLAYM4_NEED_NEET_LOOP = 35; //丢帧需要下个循环
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const PLAYM4_SYS_NOT_SUPPORT = 16; // 不支持
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importScripts('Decoder.js');
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Module.addOnPostRun(function () {
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postMessage({'function': "loaded"});
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});
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var iStreamMode = 0; // 流模式
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var bOpenMode = false;
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var bOpenStream = false;
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var funGetFrameData = null;
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var funGetAudFrameData = null;
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var bWorkerPrintLog=false;//worker层log开关
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var g_nPort = -1;
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onmessage = function (event)
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{
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var eventData = event.data;
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var res = 0;
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switch (eventData.command)
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{
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case "printLog":
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let downloadFlag=eventData.data;
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if(downloadFlag===true)
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{
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bWorkerPrintLog=true;
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res = Module._SetPrintLogFlag(g_nPort,downloadFlag);
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}
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else
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{
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bWorkerPrintLog=false;
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res = Module._SetPrintLogFlag(g_nPort,downloadFlag);
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}
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if (res !== PLAYM4_OK)
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{
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console.log("DecodeWorker.js: PlayerSDK print log failed,res"+res);
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postMessage({'function': "printLog", 'errorCode': res});
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}
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break;
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case "SetPlayPosition":
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let nFrameNumOrTime=eventData.data;
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let enPosType=eventData.type;
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// res = Module._SetPlayPosition(nFrameNumOrTime,enPosType);
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// if (res !== PLAYM4_OK)
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// {
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// postMessage({'function': "SetPlayPosition", 'errorCode': res});
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// return;
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// }
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// //有没有buffer需要清除
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break;
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case "SetStreamOpenMode":
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//获取端口号
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g_nPort = Module._GetPort();
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//设置流打开模式
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iStreamMode = eventData.data;
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res = Module._SetStreamOpenMode(g_nPort,iStreamMode);
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if (res !== PLAYM4_OK)
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{
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postMessage({'function': "SetStreamOpenMode", 'errorCode': res});
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return;
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}
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bOpenMode = true;
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break;
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case "OpenStream":
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// 接收到的数据
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var iHeadLen = eventData.dataSize;
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var pHead = Module._malloc(iHeadLen + 4);
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if (pHead === null)
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{
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return;
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}
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var aHead = Module.HEAPU8.subarray(pHead, pHead + iHeadLen);
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aHead.set(eventData.data);
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res = Module._OpenStream(g_nPort,pHead, iHeadLen, eventData.bufPoolSize);
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postMessage({'function': "OpenStream", 'errorCode': res});
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if (res !== PLAYM4_OK)
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{
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//释放内存
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Module._free(pHead);
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pHead = null;
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return;
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}
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bOpenStream = true;
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break;
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case "Play":
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let resP = Module._Play(g_nPort);
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if (resP !== PLAYM4_OK)
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{
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return;
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}
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break;
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case "InputData":
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// 接收到的数据
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var iLen = eventData.dataSize;
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if (iLen > 0)
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{
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var pInputData = Module._malloc(iLen);
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if (pInputData === null)
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{
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return;
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}
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var inputData = new Uint8Array(eventData.data);
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// var aInputData = Module.HEAPU8.subarray(pInputData, pInputData + iLen);
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// aInputData.set(inputData);
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Module.writeArrayToMemory(inputData, pInputData);
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inputData = null;
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res = Module._InputData(g_nPort,pInputData, iLen);
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if (res !== PLAYM4_OK)
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{
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let errorCode = Module._GetLastError(g_nPort);
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let sourceRemain = Module._GetSourceBufferRemain(g_nPort);
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postMessage({'function': "InputData", 'errorCode': errorCode,"sourceRemain":sourceRemain});
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}
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Module._free(pInputData);
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pInputData = null;
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}else{
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let sourceRemain = Module._GetSourceBufferRemain(g_nPort);
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if(sourceRemain == 0)
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{
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console.log("C buffer and JS buffer size is both 0");
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postMessage({'function': "InputData", 'errorCode':PLAYM4_NEED_MORE_DATA});
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return;
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}
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}
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/////////////////////
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if (funGetFrameData === null)
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{
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funGetFrameData = Module.cwrap('GetFrameData', 'number');
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}
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while (bOpenMode && bOpenStream)
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{
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var ret = getFrameData(funGetFrameData);
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// 直到获取视频帧或数据不足为止
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if (PLAYM4_VIDEO_FRAME === ret ||PLAYM4_NEED_MORE_DATA === ret || PLAYM4_ORDER_ERROR === ret || PLAYM4_NEED_NEET_LOOP ===ret)//PLAYM4_VIDEO_FRAME === ret ||
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{
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break;
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}
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}
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break;
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case "SetSecretKey":
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var keyLen = eventData.nKeyLen;
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var pKeyData = Module._malloc(keyLen);
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if (pKeyData === null) {
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return;
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}
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var nKeySize = eventData.data.length
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var bufData = stringToBytes (eventData.data);
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var aKeyData = Module.HEAPU8.subarray(pKeyData, pKeyData + keyLen);
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aKeyData.set(new Uint8Array(bufData));
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res = Module._SetSecretKey(g_nPort,eventData.nKeyType, pKeyData, keyLen);//, nKeySize
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if (res !== PLAYM4_OK) {
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postMessage({'function': "SetSecretKey", 'errorCode': res});
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Module._free(pKeyData);
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pKeyData = null;
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return;
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}
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Module._free(pKeyData);
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pKeyData = null;
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break;
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case "GetBMP":
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var nBMPWidth = eventData.width;
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var nBMPHeight = eventData.height;
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var pYUVData = eventData.data;
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var nYUVSize = nBMPWidth * nBMPHeight * 3 / 2;
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var oBMPCropRect = eventData.rect;
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var pDataYUV = Module._malloc(nYUVSize);
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if (pDataYUV === null) {
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return;
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}
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Module.writeArrayToMemory(new Uint8Array(pYUVData, 0, nYUVSize), pDataYUV);
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// 分配BMP空间
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var nBmpSize = nBMPWidth * nBMPHeight * 4 + 60;
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var pBmpData = Module._malloc(nBmpSize);
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var pBmpSize = Module._malloc(4);
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if (pBmpData === null || pBmpSize === null) {
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Module._free(pDataYUV);
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pDataYUV = null;
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if (pBmpData != null) {
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Module._free(pBmpData);
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pBmpData = null;
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}
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if (pBmpSize != null) {
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Module._free(pBmpSize);
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pBmpSize = null;
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}
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return;
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}
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//Module._memset(pBmpSize, nBmpSize, 4); // 防止bmp截图出现输入数据过大的错误码
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Module.setValue(pBmpSize, nBmpSize, "i32");
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res = Module._GetBMP(g_nPort,pDataYUV, nYUVSize, pBmpData, pBmpSize,
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oBMPCropRect.left, oBMPCropRect.top, oBMPCropRect.right, oBMPCropRect.bottom);
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if (res !== PLAYM4_OK) {
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postMessage({'function': "GetBMP", 'errorCode': res});
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Module._free(pDataYUV);
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pDataYUV = null;
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Module._free(pBmpData);
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pBmpData = null;
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Module._free(pBmpSize);
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pBmpSize = null;
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return;
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}
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// 获取BMP图片大小
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var nBmpDataSize = Module.getValue(pBmpSize, "i32");
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// 获取BMP图片数据
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var aBmpData = new Uint8Array(nBmpDataSize);
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aBmpData.set(Module.HEAPU8.subarray(pBmpData, pBmpData + nBmpDataSize));
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postMessage({'function': "GetBMP", 'data': aBmpData, 'errorCode': res}, [aBmpData.buffer]);
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aBmpData=null;
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if (pDataYUV != null) {
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Module._free(pDataYUV);
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pDataYUV = null;
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}
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if (pBmpData != null) {
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Module._free(pBmpData);
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pBmpData = null;
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}
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if (pBmpSize != null) {
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Module._free(pBmpSize);
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pBmpSize = null;
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}
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break;
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case "GetJPEG":
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var nJpegWidth = eventData.width;
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var nJpegHeight = eventData.height;
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var pYUVData1 = eventData.data;
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var nYUVSize1 = nJpegWidth * nJpegHeight * 3 / 2;
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var oJpegCropRect = eventData.rect;
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var pDataYUV1 = Module._malloc(nYUVSize1);
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if (pDataYUV1 === null) {
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return;
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}
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Module.writeArrayToMemory(new Uint8Array(pYUVData1, 0, nYUVSize1), pDataYUV1);
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// 分配JPEG空间
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var pJpegData = Module._malloc(nYUVSize1);
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var pJpegSize = Module._malloc(4);
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if (pJpegData === null || pJpegSize === null) {
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if (pJpegData != null) {
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Module._free(pJpegData);
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pJpegData = null;
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}
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if (pJpegSize != null) {
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Module._free(pJpegSize);
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pJpegSize = null;
|
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}
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if (pDataYUV1 != null) {
|
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Module._free(pDataYUV1);
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pDataYUV1 = null;
|
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}
|
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return;
|
|||
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}
|
|||
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|
|||
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Module.setValue(pJpegSize, nJpegWidth * nJpegHeight * 2, "i32"); // JPEG抓图，输入缓冲长度不小于当前帧YUV大小
|
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|
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res = Module._GetJPEG(g_nPort,pDataYUV1, nYUVSize1, pJpegData, pJpegSize,
|
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oJpegCropRect.left, oJpegCropRect.top, oJpegCropRect.right, oJpegCropRect.bottom);
|
|||
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if (res !== PLAYM4_OK) {
|
|||
|
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postMessage({'function': "GetJPEG", 'errorCode': res});
|
|||
|
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if (pJpegData != null) {
|
|||
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Module._free(pJpegData);
|
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pJpegData = null;
|
|||
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}
|
|||
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|
|||
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if (pJpegSize != null) {
|
|||
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Module._free(pJpegSize);
|
|||
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pJpegSize = null;
|
|||
|
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}
|
|||
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|
|||
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if (pDataYUV1 != null) {
|
|||
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Module._free(pDataYUV1);
|
|||
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pDataYUV1 = null;
|
|||
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}
|
|||
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return;
|
|||
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|
}
|
|||
|
|
|
|||
|
|
// 获取JPEG图片大小
|
|||
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var nJpegSize = Module.getValue(pJpegSize, "i32");
|
|||
|
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|
|||
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// 获取JPEG图片数据
|
|||
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var aJpegData = new Uint8Array(nJpegSize);
|
|||
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aJpegData.set(Module.HEAPU8.subarray(pJpegData, pJpegData + nJpegSize));
|
|||
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|
|||
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postMessage({'function': "GetJPEG", 'data': aJpegData, 'errorCode': res}, [aJpegData.buffer]);
|
|||
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|
|||
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nJpegSize = null;
|
|||
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aJpegData = null;
|
|||
|
|
|
|||
|
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if (pDataYUV1 != null) {
|
|||
|
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Module._free(pDataYUV1);
|
|||
|
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pDataYUV1 = null;
|
|||
|
|
}
|
|||
|
|
if (pJpegData != null) {
|
|||
|
|
Module._free(pJpegData);
|
|||
|
|
pJpegData = null;
|
|||
|
|
}
|
|||
|
|
if (pJpegSize != null) {
|
|||
|
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Module._free(pJpegSize);
|
|||
|
|
pJpegSize = null;
|
|||
|
|
}
|
|||
|
|
break;
|
|||
|
|
|
|||
|
|
case "SetDecodeFrameType":
|
|||
|
|
var nFrameType = eventData.data;
|
|||
|
|
res = Module._SetDecodeFrameType(g_nPort,nFrameType);
|
|||
|
|
if (res !== PLAYM4_OK) {
|
|||
|
|
postMessage({'function': "SetDecodeFrameType", 'errorCode': res});
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
break;
|
|||
|
|
case "CloseStream":
|
|||
|
|
//stop
|
|||
|
|
let resS = Module._Stop(g_nPort);
|
|||
|
|
if (resS !== PLAYM4_OK) {
|
|||
|
|
postMessage({'function': "Stop", 'errorCode': res});
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
//closeStream
|
|||
|
|
res = Module._CloseStream(g_nPort);
|
|||
|
|
if (res !== PLAYM4_OK) {
|
|||
|
|
postMessage({'function': "CloseStream", 'errorCode': res});
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
//freePort
|
|||
|
|
let resF = Module._FreePort(g_nPort);
|
|||
|
|
if (resF !== PLAYM4_OK) {
|
|||
|
|
postMessage({'function': "FreePort", 'errorCode': res});
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
break;
|
|||
|
|
case "PlaySound":
|
|||
|
|
let resPS = Module._PlaySound(g_nPort);
|
|||
|
|
if (resPS !== PLAYM4_OK) {
|
|||
|
|
console.log("PlaySound failed");
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
break;
|
|||
|
|
case "StopSound":
|
|||
|
|
let resSS = Module._StopSound();
|
|||
|
|
if (resSS !== PLAYM4_OK) {
|
|||
|
|
console.log("StopSound failed");
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
break;
|
|||
|
|
case "SetVolume":
|
|||
|
|
let resSV = Module._SetVolume(g_nPort,eventData.volume);
|
|||
|
|
if (resSV !== PLAYM4_OK) {
|
|||
|
|
console.log("Audio SetVolume failed");
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
break;
|
|||
|
|
case "GetVolume":
|
|||
|
|
let volume = Module._GetVolume();
|
|||
|
|
if(volume>0)
|
|||
|
|
{
|
|||
|
|
postMessage({'function': "GetVolume", 'volume': volume});
|
|||
|
|
}
|
|||
|
|
else{
|
|||
|
|
console.log("Audio GetVolume failed");
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
break;
|
|||
|
|
case "OnlyPlaySound":
|
|||
|
|
let resOPS = Module._OnlyPlaySound(g_nPort);
|
|||
|
|
if (resOPS !== PLAYM4_OK) {
|
|||
|
|
console.log("OnlyPlaySound failed");
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
break;
|
|||
|
|
case "Pause" :
|
|||
|
|
let resPa = Module._Pause(g_nPort,eventData.bPlay);
|
|||
|
|
if (resPa !== PLAYM4_OK) {
|
|||
|
|
console.log("Pause failed");
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
case "PlayRate":
|
|||
|
|
Module._SetPlayRate(g_nPort,eventData.playRate);
|
|||
|
|
break;
|
|||
|
|
case "SetIFrameDecInterval":
|
|||
|
|
Module._SetIFrameDecInterval(g_nPort,eventData.data);
|
|||
|
|
break;
|
|||
|
|
case "SetLostFrameMode":
|
|||
|
|
Module._SetLostFrameMode(g_nPort,eventData.data);
|
|||
|
|
break;
|
|||
|
|
case "SetDemuxModel":
|
|||
|
|
Module._SetDemuxModel(g_nPort,eventData.nIdemuxType,eventData.bTrue);
|
|||
|
|
break;
|
|||
|
|
case "SkipErrorData":
|
|||
|
|
Module._SkipErrorData(g_nPort,eventData.bSkip);
|
|||
|
|
break;
|
|||
|
|
case "SetDecodeERC":
|
|||
|
|
Module._SetDecodeERC(g_nPort,eventData.nLevel);
|
|||
|
|
break;
|
|||
|
|
case "SetANRParam":
|
|||
|
|
Module._SetANRParam(g_nPort,eventData.nEnable,eventData.nANRLevel);
|
|||
|
|
break;
|
|||
|
|
case "SetResampleValue":
|
|||
|
|
Module._SetResampleValue(g_nPort,eventData.nEnable,eventData.resampleValue);
|
|||
|
|
break;
|
|||
|
|
case "GetLastError":
|
|||
|
|
let errorCode = Module._GetLastError(g_nPort);
|
|||
|
|
postMessage({'function': "GetLastError", 'errorCode': errorCode});
|
|||
|
|
break;
|
|||
|
|
case "SetGlobalBaseTime":
|
|||
|
|
Module._SetGlobalBaseTime(g_nPort,eventData.year,eventData.month,eventData.day,eventData.hour,eventData.min,eventData.sec,eventData.ms);
|
|||
|
|
break;
|
|||
|
|
default:
|
|||
|
|
break;
|
|||
|
|
}
|
|||
|
|
};
|
|||
|
|
|
|||
|
|
function getOSDTime(oFrameInfo) {
|
|||
|
|
var iYear = oFrameInfo.year;
|
|||
|
|
var iMonth = oFrameInfo.month;
|
|||
|
|
var iDay = oFrameInfo.day;
|
|||
|
|
var iHour = oFrameInfo.hour;
|
|||
|
|
var iMinute = oFrameInfo.minute;
|
|||
|
|
var iSecond = oFrameInfo.second;
|
|||
|
|
|
|||
|
|
if (iMonth < 10) {
|
|||
|
|
iMonth = "0" + iMonth;
|
|||
|
|
}
|
|||
|
|
if (iDay < 10) {
|
|||
|
|
iDay = "0" + iDay;
|
|||
|
|
}
|
|||
|
|
if (iHour < 10) {
|
|||
|
|
iHour = "0" + iHour;
|
|||
|
|
}
|
|||
|
|
if (iMinute < 10) {
|
|||
|
|
iMinute = "0" + iMinute;
|
|||
|
|
}
|
|||
|
|
if (iSecond < 10) {
|
|||
|
|
iSecond = "0" + iSecond;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
return iYear + "-" + iMonth + "-" + iDay + " " + iHour + ":" + iMinute + ":" + iSecond;
|
|||
|
|
}
|
|||
|
|
// 获取帧数据
|
|||
|
|
function getFrameData(fun)
|
|||
|
|
{
|
|||
|
|
// function getFrameData() {
|
|||
|
|
// 获取帧数据
|
|||
|
|
// var res = Module._GetFrameData();
|
|||
|
|
var res = fun();
|
|||
|
|
if (res === PLAYM4_OK)
|
|||
|
|
{
|
|||
|
|
var oFrameInfo = Module._GetFrameInfo();
|
|||
|
|
switch (oFrameInfo.frameType)
|
|||
|
|
{
|
|||
|
|
case AUDIO_TYPE:
|
|||
|
|
var iSize = oFrameInfo.frameSize;
|
|||
|
|
if (0 === iSize)
|
|||
|
|
{
|
|||
|
|
return -1;
|
|||
|
|
}
|
|||
|
|
var pPCM = Module._GetFrameBuffer();
|
|||
|
|
// var audioBuf = new ArrayBuffer(iSize);
|
|||
|
|
var aPCMData = new Uint8Array(iSize);
|
|||
|
|
aPCMData.set(Module.HEAPU8.subarray(pPCM, pPCM + iSize));
|
|||
|
|
if(bWorkerPrintLog)
|
|||
|
|
{
|
|||
|
|
console.log("<<<Worker: audio media Info: nSise:"+ oFrameInfo.frameSize+",nSampleRate:"+oFrameInfo.samplesPerSec+',channel:'+oFrameInfo.channels+',bitsPerSample:'+oFrameInfo.bitsPerSample);
|
|||
|
|
}
|
|||
|
|
postMessage({
|
|||
|
|
'function': "GetFrameData", 'type': "audioType", 'data': aPCMData.buffer,
|
|||
|
|
'frameInfo': oFrameInfo, 'errorCode': res
|
|||
|
|
}, [aPCMData.buffer]);
|
|||
|
|
|
|||
|
|
oFrameInfo = null;
|
|||
|
|
pPCM = null;
|
|||
|
|
aPCMData = null;
|
|||
|
|
return PLAYM4_AUDIO_FRAME;
|
|||
|
|
|
|||
|
|
case VIDEO_TYPE:
|
|||
|
|
var szOSDTime = getOSDTime(oFrameInfo);
|
|||
|
|
|
|||
|
|
var iWidth = oFrameInfo.width;
|
|||
|
|
var iHeight = oFrameInfo.height;
|
|||
|
|
|
|||
|
|
var iYUVSize = iWidth * iHeight * 3 / 2;
|
|||
|
|
if (0 === iYUVSize)
|
|||
|
|
{
|
|||
|
|
return -1;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
var pYUV = Module._GetFrameBuffer();
|
|||
|
|
|
|||
|
|
// 图像数据渲染后压回，若从主码流切到子码流，存在数组大小与图像大小不匹配现象
|
|||
|
|
var aYUVData = new Uint8Array(iYUVSize);
|
|||
|
|
aYUVData.set(Module.HEAPU8.subarray(pYUV, pYUV + iYUVSize));
|
|||
|
|
if(bWorkerPrintLog)
|
|||
|
|
{
|
|||
|
|
console.log("<<<Worker: video media Info: Width:"+ oFrameInfo.width+",Height:"+oFrameInfo.height+",timeStamp:"+oFrameInfo.timeStamp);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
postMessage({
|
|||
|
|
'function': "GetFrameData", 'type': "videoType", 'data': aYUVData.buffer,
|
|||
|
|
'dataLen': aYUVData.length,'osd': szOSDTime, 'frameInfo': oFrameInfo, 'errorCode': res
|
|||
|
|
}, [aYUVData.buffer]);
|
|||
|
|
|
|||
|
|
oFrameInfo = null;
|
|||
|
|
pYUV = null;
|
|||
|
|
aYUVData = null;
|
|||
|
|
return PLAYM4_VIDEO_FRAME;
|
|||
|
|
|
|||
|
|
case PRIVT_TYPE:
|
|||
|
|
postMessage({
|
|||
|
|
'function': "GetFrameData", 'type': "", 'data': null,
|
|||
|
|
'dataLen': -1, 'osd': 0, 'frameInfo': null, 'errorCode': PLAYM4_SYS_NOT_SUPPORT
|
|||
|
|
});
|
|||
|
|
return PLAYM4_SYS_NOT_SUPPORT;
|
|||
|
|
|
|||
|
|
default:
|
|||
|
|
postMessage({
|
|||
|
|
'function': "GetFrameData", 'type': "", 'data': null,
|
|||
|
|
'dataLen': -1, 'osd': 0, 'frameInfo': null, 'errorCode': PLAYM4_SYS_NOT_SUPPORT
|
|||
|
|
});
|
|||
|
|
return PLAYM4_SYS_NOT_SUPPORT;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
else {
|
|||
|
|
let errorCode = Module._GetLastError(g_nPort);
|
|||
|
|
//解码失败返回裸数据
|
|||
|
|
if(PLAYM4_DECODE_ERROR===errorCode)
|
|||
|
|
{
|
|||
|
|
var rawInfo=Module._GetRawDataInfo();
|
|||
|
|
var pRawData = Module._GetRawDataBuffer();
|
|||
|
|
var aRawData = new Uint8Array(rawInfo.isize);
|
|||
|
|
aRawData.set(Module.HEAPU8.subarray(pRawData, pRawData + rawInfo.isize));
|
|||
|
|
postMessage({
|
|||
|
|
'function': "GetRawData", 'type': "", 'data':aRawData.buffer,
|
|||
|
|
'rawDataLen': rawInfo.isize, 'osd': 0, 'frameInfo': null, 'errorCode': errorCode
|
|||
|
|
});
|
|||
|
|
rawInfo=null;
|
|||
|
|
pRawData=null;
|
|||
|
|
aRawData=null;
|
|||
|
|
}
|
|||
|
|
//需要更多数据
|
|||
|
|
if (PLAYM4_NEED_MORE_DATA === errorCode || PLAYM4_SYS_NOT_SUPPORT === errorCode || PLAYM4_NEED_NEET_LOOP === errorCode){
|
|||
|
|
postMessage({
|
|||
|
|
'function': "GetFrameData", 'type': "", 'data': null,
|
|||
|
|
'dataLen': -1, 'osd': 0, 'frameInfo': null, 'errorCode': errorCode
|
|||
|
|
});
|
|||
|
|
}
|
|||
|
|
return errorCode;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// 开始计算时间
|
|||
|
|
function startTime() {
|
|||
|
|
return new Date().getTime();
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// 结束计算时间
|
|||
|
|
function endTime() {
|
|||
|
|
return new Date().getTime();
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// 字母字符串转byte数组
|
|||
|
|
function stringToBytes ( str ) {
|
|||
|
|
var ch, st, re = [];
|
|||
|
|
for (var i = 0; i < str.length; i++ ) {
|
|||
|
|
ch = str.charCodeAt(i); // get char
|
|||
|
|
st = []; // set up "stack"
|
|||
|
|
do {
|
|||
|
|
st.push( ch & 0xFF ); // push byte to stack
|
|||
|
|
ch = ch >> 8; // shift value down by 1 byte
|
|||
|
|
}
|
|||
|
|
while ( ch );
|
|||
|
|
// add stack contents to result
|
|||
|
|
// done because chars have "wrong" endianness
|
|||
|
|
re = re.concat( st.reverse() );
|
|||
|
|
}
|
|||
|
|
// return an array of bytes
|
|||
|
|
return re;
|
|||
|
|
}
|
|||
|
|
})();
|