IE浏览器下实现低延迟播放RTSP或RTMP流

首先,虽然本文是介绍IE浏览器下OCX控件播放RTSP或RTMP,但这种方式并不推荐,毕竟它只能用于IE浏览器环境下,局限太大,而且随着微软IE浏览器的更新,不确定后续支持情况。当然,话说回来,如果是在特定的使用场景下,只需要某些版本IE浏览器支持,但对延迟和稳定性要求非常高,OCX控件方式也不失为一个好的选择。

如果需要浏览器场景下有更好的兼容性,对于RTSP流来说,好多公司通常的做法是把RTSP转RTMP,然后分发到RTMP服务器,然后服务器转http-flv出来,浏览器直接播放http-flv流,或者直接播放hls流(如果可以忍受几秒甚至十几秒延迟的话)。

本文基于大牛直播SDK https://github.com/daniulive/SmarterStreaming 现有RTSP、RTMP播放接口的基础上,二次封装,扩展了ocx控件,用于IE浏览器下的低延迟RTMP或RTSP播放,支持RTMP/RTSP H.265(hevc)播放。

页面展示

图一:

IE浏览器下实现低延迟播放RTSP或RTMP流

图二:

IE浏览器下实现低延迟播放RTSP或RTMP流

设计注意事项:

1. 接口透传,不再赘述,注意数据类型即可;

2. Event回调传递,特别是多窗口多实例播放模式下,需要区分处理不同实例回调上来的event(如分辨率、实时码率、网络状态等);

3. OCX控件正常注册、反注册(运行网页播放端之前,请确保以管理员权限注册ocx控件:regplayerocx.bat右键-->“以管理员身份运行(A)”,同理,反注册也是需要管理员身份);

4. 浏览器模式下,如滚动条拖动,避免因此带来的闪烁;

5. 等比例绘制,这块最好做到底层SDK里面去,要么,比较笨的办法是,底层回调上来视频宽高信息,上层根据比例二次处理;

6. 窗口显示模式和全屏模式切换等。

对应封装接口

	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);

设置LOG存放路径:

ULONG CSmartPlayerActiveXCtrl::NT_SetLogPath(LPCTSTR log_path)

请于NT_Open() 之前调用,代码示例:

var obj = document.getElementById("SmartPlayerActiveX");
				
//如需记录log文件,请确保log路径存在, 如多级目录, 可按照"D:\\Daniulive\\log"类似格式设定, 记录文件名: smart_sdk.log

obj.NT_SetLogPath("D:\\");

接口说明:

   1.  ULONG NT_Open();

打开player实例;
    2. ULONG NT_Close();

关闭player实例;
    3. ULONG NT_StartPlay();

开始播放;
    4. ULONG NT_StopPlay();

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

设置实时静音;
    6. ULONG NT_SetURL(LPCTSTR url);

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

设置buffer time,缓冲时间,单位:毫秒;
    8. ULONG NT_SetRTSPTcpMode(LONG isUsingTCP);

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

设置RTSP超时时间;
    10. ULONG NT_SetRtspAutoSwitchTcpUdp(LONG is_auto_switch_tcp_udp);

设置是否自动切换TCP/UDP模式;
    11. ULONG NT_SetFastStartup(LONG isFastStartup);

设置是否快速启动;
    12. ULONG NT_SetLowLatencyMode(LONG mode);

设置是否低延迟模式播放;
    13. ULONG NT_SetFlipVertical(LONG is_flip);

设置垂直反转模式图像;
    14. ULONG NT_SetFlipHorizontal(LONG is_flip);

设置水平反转图像;
    15. ULONG NT_SetRotation(LONG degress);

设置旋转图像,可设定角度:0度 90度 180度 270度;
    16. ULONG NT_SwitchURL(LPCTSTR url);

设置快速切换RTSP/RTMP url;
    17. ULONG NT_SetCaptureImagePath(LPCTSTR path);

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

设置实时快照功能;
    19. ULONG NT_SetRecorderDirectory(LPCTSTR dir);

设置录像保存位置;
    20. ULONG NT_SetRecorderFileMaxSize(ULONG size);

设置单个录像文件最大size,单位:兆;
    21. ULONG NT_NT_SP_RecorderFileNameRuler(ULONG type, LPCTSTR file_name_prefix, LONG append_date, LONG append_time);

设置录像文件命名规则:是否需要前缀、是否添加日期、是否添加时间;
    22. ULONG NT_SetRecorderAudioTranscodeAAC(LONG is_transcode);

设置录像音频文件是否转AAC后录制,支持PCMA/PCMU/SPEEX转AAC后录制文件;
    23. ULONG NT_SetRecorderVideo(LONG is_record_video);

设置是否录制视频;
    24. ULONG NT_SetRecorderAudio(LONG is_record_audio);

设置是否录制音频;
    25. ULONG NT_StartRecorder();

开始录像;
    26. ULONG NT_StopRecorder();

停止录像;
    27. ULONG NT_FullScreen();

全屏显示窗口。

    28. ULONG NT_SetObjectID();

设置Object ID,用于区分不同实例。

    29. ULONG NT_SetSDKClientKey();

设置license key,用于授权。

    30. ULONG NT_SetAudioVolume();

 播放端实时音量调节。

    31. ULONG NT_SetRenderScaleMode();

 设置是否等比例显示窗体。

事件Event:    

1. void OnSDKEventReceived;

回调网络状态、buffering状态、下载速度等;

事件类型:

		<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;	/*连接中*/
			var NT_SP_E_EVENT_ID_CONNECTION_FAILED		= NT_SP_E_EVENT_ID_BASE | 0x3;	/*连接失败*/
			var NT_SP_E_EVENT_ID_CONNECTED				= NT_SP_E_EVENT_ID_BASE | 0x4;	/*已连接*/
			var NT_SP_E_EVENT_ID_DISCONNECTED			= NT_SP_E_EVENT_ID_BASE | 0x5;	/*断开连接*/
			var NT_SP_E_EVENT_ID_NO_MEDIADATA_RECEIVED	= NT_SP_E_EVENT_ID_BASE | 0x8;	/*收不到RTMP数据*/
			var NT_SP_E_EVENT_ID_RTSP_STATUS_CODE       = NT_SP_E_EVENT_ID_BASE | 0xB;  /*rtsp status code上报, 目前只上报401, param1表示status code*/

			/* 接下来请从0x81开始*/
			var NT_SP_E_EVENT_ID_START_BUFFERING = NT_SP_E_EVENT_ID_BASE | 0x81; /*开始缓冲*/
			var NT_SP_E_EVENT_ID_BUFFERING		 = NT_SP_E_EVENT_ID_BASE | 0x82; /*缓冲中, param1 表示百分比进度*/
			var NT_SP_E_EVENT_ID_STOP_BUFFERING  = NT_SP_E_EVENT_ID_BASE | 0x83; /*停止缓冲*/

			var NT_SP_E_EVENT_ID_DOWNLOAD_SPEED  = NT_SP_E_EVENT_ID_BASE | 0x91; /*下载速度, param1表示下载速度,单位是(Byte/s)*/

			var NT_SP_E_EVENT_ID_PLAYBACK_REACH_EOS		= NT_SP_E_EVENT_ID_BASE | 0xa1; /*播放结束, 直播流没有这个事件,点播流才有*/
			var NT_SP_E_EVENT_ID_RECORDER_REACH_EOS		= NT_SP_E_EVENT_ID_BASE | 0xa2; /*录像结束, 直播流没有这个事件, 点播流才有*/
			var NT_SP_E_EVENT_ID_PULLSTREAM_REACH_EOS   = NT_SP_E_EVENT_ID_BASE | 0xa3; /*拉流结束, 直播流没有这个事件,点播流才有*/
			var NT_SP_E_EVENT_ID_DURATION = NT_SP_E_EVENT_ID_BASE | 0xa8; /*视频时长,如果是直播,则不上报,如果是点播的话, 若能从视频源获取视频时长的话,则上报, param1表示视频时长,单位是毫秒(ms)*/
		</script>

调用展示:

		<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 IE11
			
			var show_str = "";

			var connection_status = event_id;

			if (connection_status != 0)
			{
				show_str += "链接状态: ";

				if (NT_SP_E_EVENT_ID_CONNECTING == connection_status)
				{
					show_str += "链接中";
				}
				else if (NT_SP_E_EVENT_ID_CONNECTION_FAILED == connection_status)
				{
					show_str += "链接失败";
				}
				else if (NT_SP_E_EVENT_ID_CONNECTED == connection_status)
				{
					show_str += "链接成功";
				}
				else if (NT_SP_E_EVENT_ID_DISCONNECTED == connection_status)
				{
					show_str += "链接断开";
				}
				else if (NT_SP_E_EVENT_ID_NO_MEDIADATA_RECEIVED == connection_status)
				{
					show_str += "收不到数据";
				}
			}

			var download_speed = -1;
			
			if (NT_SP_E_EVENT_ID_DOWNLOAD_SPEED == event_id)
			{
				download_speed = param1;
			}
			
			if (download_speed != -1)
			{
				show_str += "下载速度:" + (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 += "缓冲状态: ";

				if (NT_SP_E_EVENT_ID_START_BUFFERING == buffer_status)
				{
					show_str += "开始缓冲";
				}
				else if (NT_SP_E_EVENT_ID_BUFFERING == buffer_status)
				{
					show_str += "缓冲中" + param1 + "%";
				}
				else if (NT_SP_E_EVENT_ID_STOP_BUFFERING == buffer_status)
				{
					show_str += "结束缓冲";
				}
			}
			
			var EventMsgText = document.getElementById("EventMsg");
						
			EventMsgText.innerHTML = show_str;
		</script>


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

回调视频宽高信息。

调用展示:

<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 IE11
	
	var VideoResolutionText = document.getElementById("VideoResolution");
				
	VideoResolutionText.innerHTML = width + "*" + height;
</script>

SDK接口调用实例:

播放和录像调用示例:

			function OpenPlayer()
			{			   
				if(is_player_opened)
				{
					return;
				}
				
				var obj = document.getElementById("SmartPlayerActiveX");
				
				//如需记录log文件,请确保log路径存在, 如多级目录, 可按照"D:\\Daniulive\\log"类似格式设定, 记录文件名: smart_sdk.log
				obj.NT_SetLogPath("D:\\");
				
				obj.NT_SetObjectID("SmartPlayerActiveX");
				
				var ret = obj.NT_Open();
				
				if(ret == 0)
				{   
				    //设置TCP/UDP模式
					var rtsp_tcp_mode = document.getElementById("rtspTcpMode").checked ? 1 : 0;
					obj.NT_SetRTSPTcpMode(rtsp_tcp_mode);
					
					//设置RTSP超时时间
					var rtsp_timeout = document.getElementById("rtspTimeout").value;
					obj.NT_SetRtspTimeout(rtsp_timeout);
					
					//设置是否自动切换TCP-UDP模式
					var rtsp_auto_switch_tcp_udp = document.getElementById("rtspAutoSwitchTcpUdp").checked ? 1 : 0;
					obj.NT_SetRtspAutoSwitchTcpUdp(rtsp_auto_switch_tcp_udp);
					
					//设置是否快速启动
					var fast_startup_mode = document.getElementById("fastStartupMode").checked ? 1 : 0;
					obj.NT_SetFastStartup(fast_startup_mode);

					//设置是否硬解码
					var is_video_hardware_decoder = document.getElementById("videoHardwareDecoder").checked ? 1 : 0;
					obj.NT_SetVideoHardwareDecoder(is_video_hardware_decoder);
					
					
					//设置需要播放或录像的RTSP/RTMP url
					var url = document.getElementById("playorReocordUrl").value;
					obj.NT_SetURL(url);
					
					//设置实时截图路径(可自行设置或选取系统存在的文件夹), 如多级目录可按照"D:\\Daniulive\\image"类似格式设定
					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浏览器,请用IE打开播放控件..");
					return;
				}
				
				if(!isActiveXInstalled())
				{
					alert("控件未加载,请先加载控件..");
					return;
				}
				
				if(is_playing)
				{
					StopPlayback();
				}
				else
				{
					StartPlayback();
				}
			}
			
			//开始播放
			function StartPlayback() {
				
				if(!is_playing && !is_recording)
				{
					OpenPlayer();
				}
				
				var obj = document.getElementById("SmartPlayerActiveX");
	
				//设置是否启用低延迟模式
				var low_latency_mode = document.getElementById("lowlatencyMode").checked ? 1 : 0;
				obj.NT_SetLowLatencyMode(low_latency_mode);
								
				//设置缓冲时间
				var buffer_time = document.getElementById("bufferTime").value;
				obj.NT_SetBuffer(buffer_time);
							
				//设置播放音量, 范围是[0, 100], 0是静音,100是最大音量, 默认是100
				//var audio_volume = 0;
				//obj.NT_SetAudioVolume(audio_volume);
				
				//设置视频画面的填充模式,如填充整个绘制窗口、等比例填充绘制窗口,如不设置,默认填充整个绘制窗口
				//mode: 0: 填充整个绘制窗口; 1: 等比例填充绘制窗口, 默认值是0
				var 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 = "开始播放";
				
				if(!is_recording)
				{
					ClosePlayer();
				}
				
				var VideoResolutionText = document.getElementById("VideoResolution");
						
				VideoResolutionText.innerHTML = "";
			}
						
			function OnBnClickedRecord()
			{
				if(!isIE())
				{
					alert("非IE浏览器,请用IE打开播放控件..");
					return;
				}
				
				if(!isActiveXInstalled())
				{
					alert("控件未加载,请先加载控件..");
					return;
				}

				if(is_recording)
				{
					StopRecorder();
				}
				else
				{
					StartRecorder();
				}
			}
			
			//开始录像
			function StartRecorder() {
				
				if(!is_playing && !is_recording)
				{
					OpenPlayer();
				}
				
				var obj = document.getElementById("SmartPlayerActiveX");
	
				//设置实时录像存放路径(可自行设置或选取系统存在的文件夹), 如多级目录可按照"D:\\Daniulive\\rec"类似格式设定
				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 = "停止录像";
				}
			}
			
			//停止录像
			function StopRecorder() {
			
				if(!is_recording)
				{
					return;
				}
				
				var obj = document.getElementById("SmartPlayerActiveX");
	
				obj.NT_StopRecorder();
				
				is_recording = false;
				
				var recordBtnText = document.getElementById("recordBtn");
				
				recordBtnText.innerHTML = "开始录像";
				
				if(!is_playing)
				{
					ClosePlayer();
				}
			}
			

快速切换URL调用示例:

//快速切换播放URL
function SwitchUrl() {

	if(!is_playing)
	{
		return;
	}

	var obj = document.getElementById("SmartPlayerActiveX");

	var switch_url = document.getElementById("playorReocordUrl").value;
	obj.NT_SwitchURL(switch_url);
}

实时静音调用示例:

//实时静音
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 = "取消静音";
	}
	else
	{
		is_mute = 1;
		muteText.innerHTML  = "实时静音";
	}
}

视频view垂直反转、水平反转、旋转调用示例:

//垂直反转
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 = "取消反转";
	}
	else
	{
		is_flip_vertical = 1;
		flipVerticalText.innerHTML  = "垂直反转";
	}
}

//水平反转
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 = "取消反转";
	}
	else
	{
		is_flip_horizontal = 1;
		flipHorizontalText.innerHTML  = "水平反转";
	}
}

//视频view旋转
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 = "旋转90度";
	}
	else if (90 == rotate_degrees_)
	{
		rotateText.innerHTML = "旋转180度";
	}
	else if (180 == rotate_degrees_)
	{
		rotateText.innerHTML = "旋转270度";
	}
	else if (270 == rotate_degrees_)
	{
		rotateText.innerHTML = "不旋转";
	}
}

实时截图调用示例:

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

	obj.NT_CaptureImage();
}

全屏显示窗口调用示例:

//全屏显示窗口
function FullScreen() {
	var obj = document.getElementById("SmartPlayerActiveX");

	obj.NT_FullScreen();
}
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