首先，雖然本文是介紹IE瀏覽器下OCX控件播放RTSP或RTMP，但這種方式并不推薦，畢竟它只能用于IE瀏覽器環境下，局限太大，而且隨著微軟IE瀏覽器的更新，不確定后續支持情況。當然，話說回來，如果是在特定的使用場景下，只需要某些版本IE瀏覽器支持，但對延遲和穩定性要求非常高，OCX控件方式也不失為一個好的選擇。

如果需要瀏覽器場景下有更好的兼容性，對于RTSP流來說，好多公司通常的做法是把RTSP轉RTMP，然后分發到RTMP服務器，然后服務器轉http-flv出來，瀏覽器直接播放http-flv流，或者直接播放hls流（如果可以忍受幾秒甚至十幾秒延遲的話）。

本文基于大牛直播SDK?https://github.com/daniulive/SmarterStreaming?現有RTSP、RTMP播放接口的基礎上，二次封裝，擴展了ocx控件，用于IE瀏覽器下的低延遲RTMP或RTSP播放，支持RTMP/RTSP H.265(hevc)播放。

頁面展示

圖一：

圖二：

設計注意事項：

1. 接口透傳，不再贅述，注意數據類型即可；

2. Event回調傳遞，特別是多窗口多實例播放模式下，需要區分處理不同實例回調上來的event（如分辨率、實時碼率、網絡狀態等）；

3. OCX控件正常注冊、反注冊（運行網頁播放端之前，請確保以管理員權限注冊ocx控件：regplayerocx.bat右鍵-->“以管理員身份運行(A)”，同理，反注冊也是需要管理員身份）；

4. 瀏覽器模式下，如滾動條拖動，避免因此帶來的閃爍；

5. 等比例繪制，這塊最好做到底層SDK里面去，要么，比較笨的辦法是，底層回調上來視頻寬高信息，上層根據比例二次處理；

6. 窗口顯示模式和全屏模式切換等。

對應封裝接口

ULONG NT_Open();ULONG NT_Close();ULONG NT_StartPlay();ULONG NT_StopPlay();ULONG NT_SetMute(LONG is_mute);ULONG NT_SetURL(LPCTSTR url);ULONG NT_SetBuffer(LONG buffer);ULONG NT_SetRTSPTcpMode(LONG isUsingTCP);ULONG NT_SetRtspTimeout(LONG timeout);ULONG NT_SetRtspAutoSwitchTcpUdp(LONG is_auto_switch_tcp_udp);ULONG NT_SetFastStartup(LONG isFastStartup);ULONG NT_SetVideoHardwareDecoder(LONG isVideoHardwareDecoder);ULONG NT_SetLowLatencyMode(LONG mode);ULONG NT_SetFlipVertical(LONG is_flip);ULONG NT_SetFlipHorizontal(LONG is_flip);ULONG NT_SetRotation(LONG degress);ULONG NT_SwitchURL(LPCTSTR url);ULONG NT_SetCaptureImagePath(LPCTSTR path);ULONG NT_CaptureImage();ULONG NT_SetRecorderDirectory(LPCTSTR dir);ULONG NT_SetRecorderFileMaxSize(ULONG size);ULONG NT_NT_SP_RecorderFileNameRuler(ULONG type, LPCTSTR file_name_prefix, LONG append_date, LONG append_time);ULONG NT_SetRecorderAudioTranscodeAAC(LONG is_transcode);ULONG NT_SetRecorderVideo(LONG is_record_video);ULONG NT_SetRecorderAudio(LONG is_record_audio);ULONG NT_StartRecorder();ULONG NT_StopRecorder();ULONG NT_FullScreen();void OnSDKEventReceived(BSTR object_id, ULONG event_id, ULONG param1);void OnVideoSizeReceived(ULONG width, ULONG height);ULONG NT_SetLogPath(LPCTSTR log_path);ULONG NT_SetObjectID(LPCTSTR obj_id_str);ULONG NT_SetSDKClientKey(LPCTSTR cid, LPCTSTR key);ULONG NT_SetAudioVolume(LONG audio_volume);ULONG NT_SetRenderScaleMode(LONG mode);

設置LOG存放路徑：

ULONG CSmartPlayerActiveXCtrl::NT_SetLogPath(LPCTSTR log_path)

請于NT_Open() 之前調用，代碼示例：

var obj = document.getElementById("SmartPlayerActiveX");//如需記錄log文件，請確保log路徑存在, 如多級目錄, 可按照"D:\\Daniulive\\log"類似格式設定, 記錄文件名: smart_sdk.logobj.NT_SetLogPath("D:\\");

接口說明：

? ?1.? ULONG NT_Open();

打開player實例；
? ? 2. ULONG NT_Close();

關閉player實例；
? ? 3. ULONG NT_StartPlay();

開始播放；
? ? 4. ULONG NT_StopPlay();

停止播放；
? ? 5. ULONG NT_SetMute(LONG is_mute);

設置實時靜音；
? ? 6. ULONG NT_SetURL(LPCTSTR url);

設置播放的RTMP或RTSP url；
? ? 7. ULONG NT_SetBuffer(LONG buffer);

設置buffer time，緩沖時間，單位：毫秒；
? ? 8. ULONG NT_SetRTSPTcpMode(LONG isUsingTCP);

設置RTSP TCP/UDP播放模式；
? ? 9. ULONG NT_SetRtspTimeout(LONG timeout);

設置RTSP超時時間；
? ? 10. ULONG NT_SetRtspAutoSwitchTcpUdp(LONG is_auto_switch_tcp_udp);

設置是否自動切換TCP/UDP模式；
? ? 11. ULONG NT_SetFastStartup(LONG isFastStartup);

設置是否快速啟動；
? ? 12. ULONG NT_SetLowLatencyMode(LONG mode);

設置是否低延遲模式播放；
? ? 13. ULONG NT_SetFlipVertical(LONG is_flip);

設置垂直反轉模式圖像；
? ? 14. ULONG NT_SetFlipHorizontal(LONG is_flip);

設置水平反轉圖像；
? ? 15. ULONG NT_SetRotation(LONG degress);

設置旋轉圖像，可設定角度：0度 90度 180度 270度；
? ? 16. ULONG NT_SwitchURL(LPCTSTR url);

設置快速切換RTSP/RTMP url；
? ? 17. ULONG NT_SetCaptureImagePath(LPCTSTR path);

設置快照保存位置；
? ? 18. ULONG NT_CaptureImage();

設置實時快照功能；
? ? 19. ULONG NT_SetRecorderDirectory(LPCTSTR dir);

設置錄像保存位置；
? ? 20. ULONG NT_SetRecorderFileMaxSize(ULONG size);

設置單個錄像文件最大size，單位：兆；
? ? 21. ULONG NT_NT_SP_RecorderFileNameRuler(ULONG type, LPCTSTR file_name_prefix, LONG append_date, LONG append_time);

設置錄像文件命名規則：是否需要前綴、是否添加日期、是否添加時間；
? ? 22. ULONG NT_SetRecorderAudioTranscodeAAC(LONG is_transcode);

設置錄像音頻文件是否轉AAC后錄制，支持PCMA/PCMU/SPEEX轉AAC后錄制文件；
? ? 23. ULONG NT_SetRecorderVideo(LONG is_record_video);

設置是否錄制視頻；
? ? 24. ULONG NT_SetRecorderAudio(LONG is_record_audio);

設置是否錄制音頻；
? ? 25. ULONG NT_StartRecorder();

開始錄像；
? ? 26. ULONG NT_StopRecorder();

停止錄像；
? ? 27. ULONG NT_FullScreen();

全屏顯示窗口。

? ? 28. ULONG NT_SetObjectID();

設置Object ID，用于區分不同實例。

? ? 29. ULONG NT_SetSDKClientKey();

設置license key，用于授權。

? ? 30. ULONG NT_SetAudioVolume();

?播放端實時音量調節。

? ? 31. ULONG NT_SetRenderScaleMode();

?設置是否等比例顯示窗體。

事件Event：? ??

1. void OnSDKEventReceived;

回調網絡狀態、buffering狀態、下載速度等；

事件類型：

<script>var NT_EVENT_ID_SMART_PLAYER_SDK = 0x01000000;var NT_SP_E_EVENT_ID_BASE = NT_EVENT_ID_SMART_PLAYER_SDK;var NT_SP_E_EVENT_ID_CONNECTING = NT_SP_E_EVENT_ID_BASE | 0x2; /*連接中*/var NT_SP_E_EVENT_ID_CONNECTION_FAILED = NT_SP_E_EVENT_ID_BASE | 0x3; /*連接失敗*/var NT_SP_E_EVENT_ID_CONNECTED = NT_SP_E_EVENT_ID_BASE | 0x4; /*已連接*/var NT_SP_E_EVENT_ID_DISCONNECTED = NT_SP_E_EVENT_ID_BASE | 0x5; /*斷開連接*/var NT_SP_E_EVENT_ID_NO_MEDIADATA_RECEIVED = NT_SP_E_EVENT_ID_BASE | 0x8; /*收不到RTMP數據*/var NT_SP_E_EVENT_ID_RTSP_STATUS_CODE = NT_SP_E_EVENT_ID_BASE | 0xB; /*rtsp status code上報, 目前只上報401, param1表示status code*//* 接下來請從0x81開始*/var NT_SP_E_EVENT_ID_START_BUFFERING = NT_SP_E_EVENT_ID_BASE | 0x81; /*開始緩沖*/var NT_SP_E_EVENT_ID_BUFFERING = NT_SP_E_EVENT_ID_BASE | 0x82; /*緩沖中, param1 表示百分比進度*/var NT_SP_E_EVENT_ID_STOP_BUFFERING = NT_SP_E_EVENT_ID_BASE | 0x83; /*停止緩沖*/var NT_SP_E_EVENT_ID_DOWNLOAD_SPEED = NT_SP_E_EVENT_ID_BASE | 0x91; /*下載速度， param1表示下載速度，單位是(Byte/s)*/var NT_SP_E_EVENT_ID_PLAYBACK_REACH_EOS = NT_SP_E_EVENT_ID_BASE | 0xa1; /*播放結束, 直播流沒有這個事件，點播流才有*/var NT_SP_E_EVENT_ID_RECORDER_REACH_EOS = NT_SP_E_EVENT_ID_BASE | 0xa2; /*錄像結束, 直播流沒有這個事件, 點播流才有*/var NT_SP_E_EVENT_ID_PULLSTREAM_REACH_EOS = NT_SP_E_EVENT_ID_BASE | 0xa3; /*拉流結束, 直播流沒有這個事件，點播流才有*/var NT_SP_E_EVENT_ID_DURATION = NT_SP_E_EVENT_ID_BASE | 0xa8; /*視頻時長，如果是直播，則不上報，如果是點播的話, 若能從視頻源獲取視頻時長的話，則上報， param1表示視頻時長，單位是毫秒(ms)*/</script>

調用展示：

<script language='javascript' for="SmartPlayerActiveX" event="OnSDKEventReceived(object_id, event_id, param1)">// Test 1 - statically load the script (This is the basis for the hack)// Works on IE8, IE9, IE10 and IE11var show_str = "";var connection_status = event_id;if (connection_status != 0){show_str += "鏈接狀態: ";if (NT_SP_E_EVENT_ID_CONNECTING == connection_status){show_str += "鏈接中";}else if (NT_SP_E_EVENT_ID_CONNECTION_FAILED == connection_status){show_str += "鏈接失敗";}else if (NT_SP_E_EVENT_ID_CONNECTED == connection_status){show_str += "鏈接成功";}else if (NT_SP_E_EVENT_ID_DISCONNECTED == connection_status){show_str += "鏈接斷開";}else if (NT_SP_E_EVENT_ID_NO_MEDIADATA_RECEIVED == connection_status){show_str += "收不到數據";}}var download_speed = -1;if (NT_SP_E_EVENT_ID_DOWNLOAD_SPEED == event_id){download_speed = param1;}if (download_speed != -1){show_str += "下載速度:" + (download_speed * 8 / 1000).toFixed(0) + "kbps " + (download_speed / 1024).toFixed(0) + "KB/s";}var buffer_status = 0;if (NT_SP_E_EVENT_ID_START_BUFFERING == event_id|| NT_SP_E_EVENT_ID_BUFFERING == event_id|| NT_SP_E_EVENT_ID_STOP_BUFFERING == event_id){buffer_status = event_id;}if (buffer_status != 0){show_str += "緩沖狀態: ";if (NT_SP_E_EVENT_ID_START_BUFFERING == buffer_status){show_str += "開始緩沖";}else if (NT_SP_E_EVENT_ID_BUFFERING == buffer_status){show_str += "緩沖中" + param1 + "%";}else if (NT_SP_E_EVENT_ID_STOP_BUFFERING == buffer_status){show_str += "結束緩沖";}}var EventMsgText = document.getElementById("EventMsg");EventMsgText.innerHTML = show_str;</script>

2. void OnVideoSizeReceived(ULONG width, ULONG height);

回調視頻寬高信息。

調用展示：

<script language='javascript' for="SmartPlayerActiveX" event="OnVideoSizeReceived(width, height)">// Test 1 - statically load the script (This is the basis for the hack)// Works on IE8, IE9, IE10 and IE11var VideoResolutionText = document.getElementById("VideoResolution");VideoResolutionText.innerHTML = width + "*" + height; </script>

SDK接口調用實例：

播放和錄像調用示例：

function OpenPlayer(){ if(is_player_opened){return;}var obj = document.getElementById("SmartPlayerActiveX");//如需記錄log文件，請確保log路徑存在, 如多級目錄, 可按照"D:\\Daniulive\\log"類似格式設定, 記錄文件名: smart_sdk.logobj.NT_SetLogPath("D:\\");obj.NT_SetObjectID("SmartPlayerActiveX");var ret = obj.NT_Open();if(ret == 0){ //設置TCP/UDP模式var rtsp_tcp_mode = document.getElementById("rtspTcpMode").checked ? 1 : 0;obj.NT_SetRTSPTcpMode(rtsp_tcp_mode);//設置RTSP超時時間var rtsp_timeout = document.getElementById("rtspTimeout").value;obj.NT_SetRtspTimeout(rtsp_timeout);//設置是否自動切換TCP-UDP模式var rtsp_auto_switch_tcp_udp = document.getElementById("rtspAutoSwitchTcpUdp").checked ? 1 : 0;obj.NT_SetRtspAutoSwitchTcpUdp(rtsp_auto_switch_tcp_udp);//設置是否快速啟動var fast_startup_mode = document.getElementById("fastStartupMode").checked ? 1 : 0;obj.NT_SetFastStartup(fast_startup_mode);//設置是否硬解碼var is_video_hardware_decoder = document.getElementById("videoHardwareDecoder").checked ? 1 : 0;obj.NT_SetVideoHardwareDecoder(is_video_hardware_decoder);//設置需要播放或錄像的RTSP/RTMP urlvar url = document.getElementById("playorReocordUrl").value;obj.NT_SetURL(url);//設置實時截圖路徑(可自行設置或選取系統存在的文件夾), 如多級目錄可按照"D:\\Daniulive\\image"類似格式設定var image_path = "D:\\";obj.NT_SetCaptureImagePath(image_path);is_player_opened = true;}}function ClosePlayer(){if(is_player_opened){var obj = document.getElementById("SmartPlayerActiveX");obj.NT_Close();var EventMsgText = document.getElementById("EventMsg"); EventMsgText.innerHTML = "";is_player_opened = false;}}function OnBnClickedPlay(){if(!isIE()){alert("非IE瀏覽器，請用IE打開播放控件..");return;}if(!isActiveXInstalled()){alert("控件未加載，請先加載控件..");return;}if(is_playing){StopPlayback();}else{StartPlayback();}}//開始播放function StartPlayback() {if(!is_playing && !is_recording){OpenPlayer();}var obj = document.getElementById("SmartPlayerActiveX");//設置是否啟用低延遲模式var low_latency_mode = document.getElementById("lowlatencyMode").checked ? 1 : 0;obj.NT_SetLowLatencyMode(low_latency_mode);//設置緩沖時間var buffer_time = document.getElementById("bufferTime").value;obj.NT_SetBuffer(buffer_time);//設置播放音量, 范圍是[0, 100], 0是靜音，100是最大音量, 默認是100//var audio_volume = 0;//obj.NT_SetAudioVolume(audio_volume);//設置視頻畫面的填充模式，如填充整個繪制窗口、等比例填充繪制窗口，如不設置，默認填充整個繪制窗口//mode： 0: 填充整個繪制窗口; 1: 等比例填充繪制窗口, 默認值是0var render_scale_mode = 1;obj.NT_SetRenderScaleMode(render_scale_mode);var ret = obj.NT_StartPlay();if(ret == 0){is_playing = true; var playBtnText = document.getElementById("playBtn");playBtnText.innerHTML = "停止播放";} }//停止播放function StopPlayback() {if(!is_playing){return;}var obj = document.getElementById("SmartPlayerActiveX");obj.NT_StopPlay();is_playing = false;var playBtnText = document.getElementById("playBtn");playBtnText.innerHTML = "開始播放";if(!is_recording){ClosePlayer();}var VideoResolutionText = document.getElementById("VideoResolution");VideoResolutionText.innerHTML = "";}function OnBnClickedRecord(){if(!isIE()){alert("非IE瀏覽器，請用IE打開播放控件..");return;}if(!isActiveXInstalled()){alert("控件未加載，請先加載控件..");return;}if(is_recording){StopRecorder();}else{StartRecorder();}}//開始錄像function StartRecorder() {if(!is_playing && !is_recording){OpenPlayer();}var obj = document.getElementById("SmartPlayerActiveX");//設置實時錄像存放路徑(可自行設置或選取系統存在的文件夾), 如多級目錄可按照"D:\\Daniulive\\rec"類似格式設定var rec_dir = "D:\\";obj.NT_SetRecorderDirectory(rec_dir);var rec_max_size = 200;obj.NT_SetRecorderFileMaxSize(rec_max_size);var type = 0;var file_name_prefix = "daniulive";var append_date = 1;var append_time = 1;obj.NT_NT_SP_RecorderFileNameRuler(type, file_name_prefix, append_date, append_time);var is_transcode = 1;obj.NT_SetRecorderAudioTranscodeAAC(is_transcode);var is_record_video = 1;obj.NT_SetRecorderVideo(is_record_video);var is_record_audio = 1;obj.NT_SetRecorderAudio(is_record_audio);var ret = obj.NT_StartRecorder();if(ret == 0){is_recording = true;var recordBtnText = document.getElementById("recordBtn");recordBtnText.innerHTML = "停止錄像";}}//停止錄像function StopRecorder() {if(!is_recording){return;}var obj = document.getElementById("SmartPlayerActiveX");obj.NT_StopRecorder();is_recording = false;var recordBtnText = document.getElementById("recordBtn");recordBtnText.innerHTML = "開始錄像";if(!is_playing){ClosePlayer();}}

快速切換URL調用示例：

//快速切換播放URL function SwitchUrl() {if(!is_playing){return;}var obj = document.getElementById("SmartPlayerActiveX");var switch_url = document.getElementById("playorReocordUrl").value;obj.NT_SwitchURL(switch_url); }

實時靜音調用示例：

//實時靜音 var is_mute = 1; function SetMute() {var obj = document.getElementById("SmartPlayerActiveX");obj.NT_SetMute(is_mute);var muteText = document.getElementById("MuteBtn");if(is_mute == 1 ){is_mute = 0;muteText.innerHTML = "取消靜音";}else{is_mute = 1;muteText.innerHTML = "實時靜音";} }

視頻view垂直反轉、水平反轉、旋轉調用示例：

//垂直反轉 var is_flip_vertical = 1; function SetFlipVertical() {var obj = document.getElementById("SmartPlayerActiveX");obj.NT_SetFlipVertical(is_flip_vertical);var flipVerticalText = document.getElementById("FlipVerticalBtn");if(is_flip_vertical == 1 ){is_flip_vertical = 0;flipVerticalText.innerHTML = "取消反轉";}else{is_flip_vertical = 1;flipVerticalText.innerHTML = "垂直反轉";} }//水平反轉 var is_flip_horizontal = 1; function SetFlipHorizontal() {var obj = document.getElementById("SmartPlayerActiveX");obj.NT_SetFlipHorizontal(is_flip_horizontal);var flipHorizontalText = document.getElementById("FlipHorizontalBtn");if(is_flip_horizontal == 1 ){is_flip_horizontal = 0;flipHorizontalText.innerHTML = "取消反轉";}else{is_flip_horizontal = 1;flipHorizontalText.innerHTML = "水平反轉";} }//視頻view旋轉 var rotate_degrees_ = 0; function SetRotation() {rotate_degrees_ += 90;rotate_degrees_ = rotate_degrees_ % 360;var obj = document.getElementById("SmartPlayerActiveX");obj.NT_SetRotation(rotate_degrees_);var rotateText = document.getElementById("RotateBtn");if (0 == rotate_degrees_){rotateText.innerHTML = "旋轉90度";}else if (90 == rotate_degrees_){rotateText.innerHTML = "旋轉180度";}else if (180 == rotate_degrees_){rotateText.innerHTML = "旋轉270度";}else if (270 == rotate_degrees_){rotateText.innerHTML = "不旋轉";} }

實時截圖調用示例：

function CaptureImage() {var obj = document.getElementById("SmartPlayerActiveX");obj.NT_CaptureImage(); }

全屏顯示窗口調用示例：

//全屏顯示窗口 function FullScreen() {var obj = document.getElementById("SmartPlayerActiveX");obj.NT_FullScreen(); }

總結

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