wpf下RTSP|RTMP播放器两种渲染模式实现

​技术背景

在这篇blog之前,我提到了wpf下播放RTMP和RTSP渲染的两种方式,一种是通过控件模式,另外一种是直接原生RTSP、RTMP播放模块,回调rgb,然后在wpf下渲染,本文就两种方式做个说明。

技术实现

以大牛直播SDK的Windows平台SmartPlayer为例,我们先说第一种通过控件模式,控件模式,非常简单:可以用picturebox,在MainWindow.xaml 做以下设置:

ini 复制代码
        <WindowsFormsHost HorizontalAlignment="Left" Height="338" Margin="10,10,0,0" VerticalAlignment="Top" Width="480" Background="Black">
            <wf:PictureBox x:Name="RealPlayWnd"></wf:PictureBox>
        </WindowsFormsHost>

StartPlayer的时候,调NT_SP_SetRenderWindow,把handler设置下去即可,如果需要硬解码,可以先做硬解码检测,检测支持的话,设置硬解码模式。

csharp 复制代码
       /*
        * nt_player_wrapper.cs
        * Author: daniusdk.com
        */
        public bool StartPlay(String url, bool is_rtsp_tcp_mode, bool is_mute, bool is_hardware_decorder)
        {
	        if ( is_playing_ )
		        return false;

            if (!OpenPlayerHandle(url, is_rtsp_tcp_mode, is_mute, is_hardware_decorder))
		        return false;

            //video resolution callback
            video_size_call_back_ = new SP_SDKVideoSizeCallBack(SP_SDKVideoSizeHandle);
            NTSmartPlayerSDK.NT_SP_SetVideoSizeCallBack(player_handle_, IntPtr.Zero, video_size_call_back_);

            if (render_wnd_ != null)
            {
                NTSmartPlayerSDK.NT_SP_SetRenderWindow(player_handle_, render_wnd_.Handle);
                NTSmartPlayerSDK.NT_SP_SetRenderScaleMode(player_handle_, 1);
            }
            else if(image_wnd_ != null)
            {
                //video frame callback (YUV/RGB)
                //format请参见 NT_SP_E_VIDEO_FRAME_FORMAT,如需回调YUV,请设置为 NT_SP_E_VIDEO_FRAME_FROMAT_I420
                video_frame_call_back_ = new SP_SDKVideoFrameCallBack(SetVideoFrameCallBack);
                NTSmartPlayerSDK.NT_SP_SetVideoFrameCallBack(player_handle_, (Int32)NT.NTSmartPlayerDefine.NT_SP_E_VIDEO_FRAME_FORMAT.NT_SP_E_VIDEO_FRAME_FORMAT_RGB32, IntPtr.Zero, video_frame_call_back_);
            }

	        uint ret = NTSmartPlayerSDK.NT_SP_StartPlay(player_handle_);
	        if ( NTBaseCodeDefine.NT_ERC_OK != ret )
	        {
                NTSmartPlayerSDK.NT_SP_Close(player_handle_);
			    player_handle_ = IntPtr.Zero;

		        return false;
	        }

	        is_playing_ = true;

	        return true;
        }

另外一种模式,是通过回调rgb,然后在image上渲染,回调rgb,在StartPlay()已有说明。=,设置回调,选择NT_SP_E_VIDEO_FRAME_FORMAT_RGB32格式,然后处理回调数据即可。

ini 复制代码
video_frame_call_back_ = new SP_SDKVideoFrameCallBack(SetVideoFrameCallBack);

NTSmartPlayerSDK.NT_SP_SetVideoFrameCallBack(player_handle_, (Int32)NT.NTSmartPlayerDefine.NT_SP_E_VIDEO_FRAME_FORMAT.NT_SP_E_VIDEO_FRAME_FORMAT_RGB32, IntPtr.Zero, video_frame_call_back_);

处理rgb数据回调的地方,拿到bitmap_source数据,设给image.Source即可:

ini 复制代码
        public void SDKVideoFrameCallBack(IntPtr handle, UInt32 status, BitmapSource bitmap_source)
        {
            if (image_wnd_ == null)
                return;

            if (player_handle_ == IntPtr.Zero || !is_playing_ || bitmap_source == null)
                return;
        
            image_wnd_.Source = bitmap_source;
        }

为了便于比较,我们做了个四窗口的demo展示(一路2560*1440,一路1920*1080),上面是通过picturebox控件直接设置handle到原生模块播放,第三第四个窗口知通过image自己绘制:

具体实现如下:

java 复制代码
       /*
        * MainWindow.xaml.cs
        * Author: daniusdk.com
        */
        public MainWindow()
        {
            InitializeComponent();

            if (!InitSDK())
                return;

            UIDispatcher = Dispatcher.CurrentDispatcher;

            player1_ = new nt_player_wrapper(RealPlayWnd, null, UIDispatcher);
            player1_.EventGetPlayerEventMsg += new DelGetPlayerEventMsg(GetPlayerEventMsgInfo);
            player1_.EventGetVideoSize += new DelGetVideoSize(GetVideoSize);

            player2_ = new nt_player_wrapper(RealPlayWnd1, null, UIDispatcher);
            player2_.EventGetPlayerEventMsg += new DelGetPlayerEventMsg(GetPlayerEventMsgInfo);
            player2_.EventGetVideoSize += new DelGetVideoSize(GetVideoSize);

            player3_ = new nt_player_wrapper(null, image_render, UIDispatcher);
            player3_.EventGetPlayerEventMsg += new DelGetPlayerEventMsg(GetPlayerEventMsgInfo);
            player3_.EventGetVideoSize += new DelGetVideoSize(GetVideoSize);

            player4_ = new nt_player_wrapper(null, image_render1, UIDispatcher);
            player4_.EventGetPlayerEventMsg += new DelGetPlayerEventMsg(GetPlayerEventMsgInfo);
            player4_.EventGetVideoSize += new DelGetVideoSize(GetVideoSize);
        }

        private bool InitSDK()
        {
            if (!is_player_sdk_init_)
            {
                UInt32 isPlayerInited = NT.NTSmartPlayerSDK.NT_SP_Init(0, IntPtr.Zero);
                if (isPlayerInited != 0)
                {
                    MessageBox.Show("调用NT_SP_Init失败..");
                    return false;
                }

                is_player_sdk_init_ = true;
            }

            return true;
        }

        private void Button_Click_1(object sender, RoutedEventArgs e)
        {
            if (!player1_.IsPlaying())
            {
                player1_.SetBuffer(0);
                bool is_mute = true;
                bool is_hardware_decoder = true;

                if (!player1_.StartPlay("rtsp://admin:daniulive12345@192.168.0.120:554/h264/ch1/main/av_stream", false, is_mute, is_hardware_decoder))
                    return;

                btn_playback1.Content = "停止播放";
            }
            else
            {
                player1_.StopPlay();
                btn_playback1.Content = "开始播放";
            }
        }

        private void Button_Click_2(object sender, RoutedEventArgs e)
        {
            if (!player2_.IsPlaying())
            {
                player2_.SetBuffer(0);
                bool is_mute = true;
                bool is_hardware_decoder = true;

                if (!player2_.StartPlay("rtsp://admin:admin123456@192.168.0.121:554/cam/realmonitor?channel=1&subtype=0", false, is_mute, is_hardware_decoder))
                    return;

                btn_playback2.Content = "停止播放";
            }
            else
            {
                player2_.StopPlay();
                btn_playback2.Content = "开始播放";
            }
        }

        private void Button_Click_3(object sender, RoutedEventArgs e)
        {
            if (!player3_.IsPlaying())
            {
                player3_.SetBuffer(0);
                bool is_mute = true;
                bool is_hardware_decoder = true;

                if (!player3_.StartPlay("rtsp://admin:daniulive12345@192.168.0.120:554/h264/ch1/main/av_stream", false, is_mute, is_hardware_decoder))
                    return;

                btn_playback3.Content = "停止播放";
            }
            else
            {
                player3_.StopPlay();
                btn_playback3.Content = "开始播放";
            }
        }

        private void Button_Click_4(object sender, RoutedEventArgs e)
        {
            if (!player4_.IsPlaying())
            {
                player4_.SetBuffer(0);
                bool is_mute = true;
                bool is_hardware_decoder = true;

                if (!player4_.StartPlay("rtsp://admin:admin123456@192.168.0.121:554/cam/realmonitor?channel=1&subtype=0", false, is_mute, is_hardware_decoder))
                    return;

                btn_playback4.Content = "停止播放";
            }
            else
            {
                player4_.StopPlay();
                btn_playback4.Content = "开始播放";
            }
        }

关闭窗口的时候,记得调用停止播放逻辑,所有实例关闭后,调用NT_SP_UnInit():

scss 复制代码
        protected override void OnClosing(System.ComponentModel.CancelEventArgs e)
        {
            if (MessageBox.Show("确定要关闭窗口吗?", "确认", MessageBoxButton.YesNo) != MessageBoxResult.Yes)
            {
                // 如果用户选择"否",取消关闭
                e.Cancel = true;
            }

            if (player1_.IsPlaying())
            {
                player1_.StopPlay();
            }

            player1_.Dispose();

            if (player2_.IsPlaying())
            {
                player2_.StopPlay();
            }

            player2_.Dispose();

            if (player3_.IsPlaying())
            {
                player3_.StopPlay();
            }

            player3_.Dispose();

            if (player4_.IsPlaying())
            {
                player4_.StopPlay();
            }

            player4_.Dispose();

            if (is_player_sdk_init_)
            {
                NTSmartPlayerSDK.NT_SP_UnInit();
                is_player_sdk_init_ = false;
            }    

            base.OnClosing(e);
        }

总结

wpf下实现低延迟的RTSP或RTMP播放,以上两种模式都可以尝试看,都不麻烦,如果想更灵活,可以采用回调rgb然后自己绘制的模式,如果想更省事,那么直接picturebox控件handle设置下去,底层自己绘制,以上是大概的实现逻辑,感兴趣的开发者,或有这方面技术诉求的,有问题可以单独跟我沟通。

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