Blackmagic的SDK在C＃ [英] blackmagic SDK in c#

问题描述

我试图对windows7的64倍，并用C＃+ VS 2010速成从一个拍摄720p利用最新SDK（2011年6月）一Blackmagic的强度亲卡。

我已经成功地编译和运行，在YUV帧捕获然而，在拍摄后56帧（回调函数停止调用）停止的程序。我想知道如果我在这里缺少简单的东西？特别是考虑到我几乎没有 - 我得到在正确的大小等，但只有很短的时间正确的内容框架

也可能是有关其他的一些信息

• 如果我拔掉摄像头采集不会停止


• 我也曾在1080i的尝试这样做与PAL和同样的情况


• 同样的事情发生，即使VideoInputFrameArrived功能是空的（即只有在这帧计数器）

这里是代码：

---

 公共部分类主窗口：窗口，IDeckLinkInputCallback 
 {
私人IDeckLinkIterator _deckLinkIterator; 
私有列表< IDeckLink> _deckLinkList =新的List< IDeckLink>（）; 
私人IDeckLink _currentDevice = NULL; 
私人IDeckLinkInput _deckLinkInput = NULL; 
 
私人INT _width = 1280; 
私人INT _height = 720; 
 
私人WriteableBitmap的_writeableBitmap = NULL; 
 
 IntPtr的_tempRGBData; 
字节[] _tempRGBDataBytes; 
 
 DispatcherTimer _timer =新DispatcherTimer（）; 
 
公共主窗口（）
 {
的InitializeComponent（）; 
} 
 
随机_random =新的随机（）; 
 
无效_timer_Tick（对象发件人，EventArgs五）
 {
 _random.NextBytes（_tempRGBDataBytes）; 
 
 _writeableBitmap.WritePixels（新Int32Rect（0，0，_width，_height），_ tempRGBData，_height * _width * 3，_width * 3）; 
} 
 
 
私人无效Window_Loaded（对象发件人，RoutedEventArgs E）
 {
 _writeableBitmap =新的WriteableBitmap的（_width，_height，72，27，的PixelFormats .Bgr24，NULL）; 
 _captureImage.Source = _writeableBitmap; 
 
 _tempRGBData = Marshal.AllocHGlobal（3 * _width * _height * Marshal.SizeOf（typeof运算（字节）））; 
 _tempRGBDataBytes =新的字节[* 3 * _width _height]。 
 _deckLinkIterator =新CDeckLinkIterator（）; 
 
 
 IDeckLink DL = NULL; 
，而（真）
 {
 _deckLinkIterator.Next（出DL）; 
 
如果（DL == NULL）
 {
中断; 
} 
，否则
 {
 _deckLinkList.Add（DL）; 
} 
} 
 
的foreach（在_deckLinkList IDeckLink设备）
 {
字符串名称; 
 device.GetModelName（满分名）; 
 Console.WriteLine（+姓名）; 
} 
 
 _currentDevice = _deckLinkList [1]; 
 _deckLinkInput =（IDeckLinkInput）_currentDevice; 
 
 UINT frameCount = 0; 
 _deckLinkInput.GetAvailableVideoFrameCount（出frameCount）; 
 
 Console.WriteLine（可用的帧数：+ frameCount）; 
 
 IDeckLinkDisplayModeIterator displayIterator = NULL; 
 _deckLinkInput.GetDisplayModeIterator（出displayIterator）; 
 
 
 _BMDDisplayModeSupport displayModeSupport; 
 IDeckLinkDisplayMode DISPLAYMODE = NULL; 
 
 _BMDDisplayMode setDisplayMode = _BMDDisplayMode.bmdModeHD720p50; 
 _BMDPixelFormat setPixelFormat = _BMDPixelFormat.bmdFormat8BitYUV; 
 _BMDVideoInputFlags setInputFlag = _BMDVideoInputFlags.bmdVideoInputFlagDefault; 
 
 _deckLinkInput.DoesSupportVideoMode（setDisplayMode，setPixelFormat，setInputFlag，出displayModeSupport，出DISPLAYMODE）; 
 
 
试
 {
 // _ deckLinkInput.DisableAudioInput（）; 
 _deckLinkInput.EnableVideoInput（setDisplayMode，setPixelFormat，setInputFlag）; 
 
} 
赶上（例外EM）
 {
 Console.WriteLine（甲板链接初始化失败：+ em.Message）; 
} 
 
 _deckLinkInput.SetCallback（本）; 
 
 
 Console.WriteLine（完成！）; 
 
 _timer.Interval = TimeSpan.FromSeconds（1F / 30F）; 
 _timer.Tick + =新的EventHandler（_timer_Tick）; 
 _timer.Start（）; 
} 
 
 
 INT frameCount = 0; 
 
公共无效VideoInputFrameArrived（IDeckLinkVideoInputFrame视频，音频IDeckLinkAudioInputPacket）
 {
 
 //获取图像数据
的IntPtr pData所; 
 video.GetBytes（出的pData）; 
 
 
 
 //保持它的简单，所以只是计算框架 - 这个被调用56次，然后停止
 Console.WriteLine（视频帧到达!!+ frameCount ）; 
 frameCount ++; 
 
} 
 
公共无效VideoInputFormatChanged（_BMDVideoInputFormatChangedEvents事件，IDeckLinkDisplayMode DISPLAYMODE，_BMDDetectedVideoInputFormatFlags标志）
 {
 Console.WriteLine（视频格式改变！ ）; 
} 
 
 //启动流
私人无效的button1_Click（对象发件人，RoutedEventArgs E）
 {
 _deckLinkInput.StartStreams（）; 
 
} 
 
 //停止流
私人无效button2_Click（对象发件人，RoutedEventArgs E）
 {
 _deckLinkInput.StopStreams（）; 
 
} 
 
私人无效button4_Click（对象发件人，RoutedEventArgs E）
 {
 _deckLinkInput.PauseStreams（）; 
} 
 
私人无效button3_Click（对象发件人，RoutedEventArgs E）
 {
 _deckLinkInput.FlushStreams（）; 
} 
} 
  

解决方案

我'已经成功地解决了这个问题与Blackmagic的技术支持帮助

解决的办法是在回调函数的末尾插入该行：

  System.Runtime.InteropServices.Marshal.ReleaseComObject（视频） 
  

i am attempting to capture 720p from one a blackmagic intensity pro cards using the newest SDK (june 2011) on windows7 64x and with C# + VS 2010 express.

i have successfully compiled and run a program that captures frames at YUV however, capture stops after 56 frames (the callback function stops being called). i am wondering if i am missing something simple here? especially given that i am almost there - i get frames with the correct content at the correct size etc but only for a brief time.

also some other information that may be relevant:

• if i unplug the camera capture does not stop
• i have also tried this at 1080i and PAL and the same happens
• same thing happens even if the VideoInputFrameArrived function is empty (i.e. with just a frame counter in it)

here is the code:

---

public partial class MainWindow : Window , IDeckLinkInputCallback
{
    private IDeckLinkIterator   _deckLinkIterator;
    private List<IDeckLink>     _deckLinkList = new List<IDeckLink>();
    private IDeckLink           _currentDevice=null;
    private IDeckLinkInput      _deckLinkInput = null;

    private int _width=1280;
    private int _height=720;

    private WriteableBitmap _writeableBitmap =null;

    IntPtr _tempRGBData;
    byte[] _tempRGBDataBytes;

    DispatcherTimer _timer = new DispatcherTimer();

    public MainWindow()
    {
        InitializeComponent();
    }

    Random _random = new Random();

    void _timer_Tick(object sender, EventArgs e)
    {
        _random.NextBytes(_tempRGBDataBytes);

        _writeableBitmap.WritePixels(new Int32Rect(0, 0, _width, _height),_tempRGBData, _height * _width * 3, _width * 3);
    }


    private void Window_Loaded(object sender, RoutedEventArgs e)
    {
        _writeableBitmap = new WriteableBitmap(_width, _height, 72, 27, PixelFormats.Bgr24, null);
        _captureImage.Source = _writeableBitmap;

        _tempRGBData = Marshal.AllocHGlobal(3 * _width * _height * Marshal.SizeOf(typeof(byte)));
        _tempRGBDataBytes = new byte[3 * _width * _height];
        _deckLinkIterator = new CDeckLinkIterator();


        IDeckLink dl=null;
        while(true)
        {
            _deckLinkIterator.Next(out dl);

            if(dl==null)
            {
                break;
            }
            else
            {
                _deckLinkList.Add(dl);
            }
        }

        foreach (IDeckLink device in _deckLinkList)
        {
            String name;
            device.GetModelName(out name);
            Console.WriteLine("" + name);
        }

        _currentDevice = _deckLinkList[1];
        _deckLinkInput = (IDeckLinkInput)_currentDevice;

        uint frameCount=0;
        _deckLinkInput.GetAvailableVideoFrameCount(out frameCount);

        Console.WriteLine("available frame count: " + frameCount);

        IDeckLinkDisplayModeIterator displayIterator=null;
        _deckLinkInput.GetDisplayModeIterator(out displayIterator);


        _BMDDisplayModeSupport displayModeSupport;
        IDeckLinkDisplayMode displayMode=null;

        _BMDDisplayMode setDisplayMode      = _BMDDisplayMode.bmdModeHD720p50;
        _BMDPixelFormat setPixelFormat      = _BMDPixelFormat.bmdFormat8BitYUV;
        _BMDVideoInputFlags setInputFlag    = _BMDVideoInputFlags.bmdVideoInputFlagDefault;

        _deckLinkInput.DoesSupportVideoMode(setDisplayMode, setPixelFormat, setInputFlag, out displayModeSupport, out displayMode);


        try
        {
            //_deckLinkInput.DisableAudioInput();
            _deckLinkInput.EnableVideoInput(setDisplayMode, setPixelFormat, setInputFlag);

        }
        catch (Exception em)
        {
            Console.WriteLine("deck link init failed: " + em.Message);
        }

        _deckLinkInput.SetCallback(this);


        Console.WriteLine("done!");

        _timer.Interval = TimeSpan.FromSeconds(1f / 30f);
        _timer.Tick += new EventHandler(_timer_Tick);
        _timer.Start();
    }


    int frameCount = 0;

    public void VideoInputFrameArrived(IDeckLinkVideoInputFrame video, IDeckLinkAudioInputPacket audio)
    {

        //get image data
        IntPtr pData;
        video.GetBytes(out pData);



        //keeping it simple so just counting frames - this gets called 56 times then stops
        Console.WriteLine("video frame arrived!! " + frameCount);
        frameCount++;

    }

    public void  VideoInputFormatChanged(_BMDVideoInputFormatChangedEvents events, IDeckLinkDisplayMode displayMode, _BMDDetectedVideoInputFormatFlags flags)
    {
        Console.WriteLine("video format changed!!");
    }

    //start stream
    private void button1_Click(object sender, RoutedEventArgs e)
    {
        _deckLinkInput.StartStreams();

    }

    //stop stream
    private void button2_Click(object sender, RoutedEventArgs e)
    {
        _deckLinkInput.StopStreams();

    }

    private void button4_Click(object sender, RoutedEventArgs e)
    {
        _deckLinkInput.PauseStreams();
    }

    private void button3_Click(object sender, RoutedEventArgs e)
    {
        _deckLinkInput.FlushStreams();
    }
 }

解决方案

i've managed to solved this problem with the help of blackmagic tech support

the solution is to insert this line at the end of the callback function:

System.Runtime.InteropServices.Marshal.ReleaseComObject(video);

这篇关于Blackmagic的SDK在C＃的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！