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SetFormatData Method

Summary

Copies data to the format buffer.

Syntax

C++/CLI

public void SetFormatData( 
   int DataSize, 
   object Data 
)

public: 
void SetFormatData(  
   int DataSize, 
   Object^ Data 
)

Parameters

DataSize
Size of the format data, in bytes. The format buffer will be set to this size.

Data
Variant containing an array reference. The array must be composed of a single dimension of bytes. This array contains the actual format data to set.

Remarks

If the method fails, an error is raised. For more information, refer to the Error Codes.

Example

using Leadtools; 
using Leadtools.Multimedia; 
using LeadtoolsMultimediaExamples.Fixtures; 
 
 
public bool _result = false; 
public ConvertCtrlForm _form = new ConvertCtrlForm(); 
 
public void GetFormatDataExample() 
{ 
   // reference the convert control 
   ConvertCtrl convertctrl = _form.ConvertCtrl; 
 
   // input file and output files 
   string inFile = Path.Combine(LEAD_VARS.MediaDir, "MediaType_ShortSource.avi"); 
   string outFilePfx = Path.Combine(LEAD_VARS.MediaDir, "MediaType_GetFormatDataExample"); 
   string sampleFileName; 
 
   // This example demonstrates how to use SampleTarget and MediaSample 
   // objects to directly access sample frames from a conversion graph. 
 
   try 
   { 
      // set the source and target files 
      convertctrl.SourceFile = inFile; 
 
      // set the preview 
      convertctrl.Preview = true; 
 
      // create a new sample target 
      SampleTarget st = new SampleTarget(); 
 
      // set the target media type for the video stream 
      MediaType mtTarget = new MediaType(); 
      mtTarget.Type = Constants.MEDIATYPE_Video; 
      mtTarget.SubType = Constants.MEDIASUBTYPE_RGB24; 
 
      // set the sample target's accepted media type 
      st.SetAcceptedMediaType(mtTarget); 
 
      // assign the sample target to the capture control 
      convertctrl.TargetObject = st; 
      convertctrl.TargetFormat = TargetFormatType.StillImage; 
 
      // run the convert 
      convertctrl.StartConvert(); 
 
      MediaSample msFrame = st.GetSample(1000); 
      long sampleStart, sampleStop; 
 
      while (msFrame != null) 
      { 
         // get the sample target's connected media type 
         MediaType mtSample = st.GetConnectedMediaType(); 
 
         // demonstrate media type properties copy 
         MediaType mtCopy = new MediaType(); 
         CopyMediaTypeAttributes(mtSample, mtCopy); 
 
         // get the sample times 
         msFrame.GetTime(out sampleStart, out sampleStop); 
 
         // create the file name for this frame bitmap 
         sampleFileName = string.Format("{0}_{1}-{2}.bmp", outFilePfx, sampleStart, sampleStop); 
 
         // create the bitmap for this frame 
         WriteSampleBitmap(sampleFileName, msFrame, mtSample); // mtCopy); 
 
         try 
         { 
            // create a media sample using the captured sample from above  
            msFrame = st.GetSample(1000); 
         } 
         catch (COMException cex) 
         { 
            // if we have reached the end of stream we are finished 
            if (cex.ErrorCode == (int)ErrorCode.VFW_E_SAMPLE_REJECTED_EOS 
               || cex.ErrorCode == (int)ErrorCode.VFW_E_WRONG_STATE) 
               break; 
            else if (cex.ErrorCode == (int)ErrorCode.VFW_E_TIMEOUT) 
               continue; 
            else 
               throw cex; 
         } 
 
         // set the result 
         _result = true; 
 
         // we'll loop on the state and pump messages for this example. 
         // but you should not need to if running from a Windows Forms application. 
         if (convertctrl.State == ConvertState.Running) 
            Application.DoEvents(); 
      } 
   } 
   catch (Exception) 
   { 
      _result = false; 
   } 
} 
 
private bool CopyMediaTypeAttributes(MediaType pSource, MediaType pDest) 
{ 
   int fmtDataSize; 
 
   // return error if either source or dest is null 
   if (pSource == null || pDest == null) 
      return false; 
 
   // get the format data size 
   fmtDataSize = pSource.FormatSize; 
 
   // any format data 
   if (fmtDataSize > 0) 
      pDest.SetFormatData(fmtDataSize, 
         pSource.GetFormatData(fmtDataSize));    // yes, then copy it 
   else 
      pDest.FormatSize = 0;                 // no, just set the dest size to zero 
 
   // copy type, subtype, formattype 
   pDest.Type = pSource.Type; 
   pDest.SubType = pSource.SubType; 
   pDest.FormatType = pSource.FormatType; 
 
   // set dest fixed size samples and temporal compression 
   pDest.FixedSizeSamples = pSource.FixedSizeSamples; 
   pDest.TemporalCompression = pSource.TemporalCompression; 
 
   // copy samplesize 
   pDest.SampleSize = pSource.SampleSize; 
 
   return true; 
} 
 
private Bitmap WriteSampleBitmap(string outFile, MediaSample ms, MediaType mt) 
{ 
   // get the video information  
   VideoInfoHeader vih = mt.GetVideoFormatData(); 
 
   // create a bitmap to hold the sample and copy it 
   Bitmap bmp = new Bitmap(vih.bmiHeader.biWidth, vih.bmiHeader.biHeight, FormatFromBitCount(vih.bmiHeader.biBitCount)); 
   BitmapData bmpData = bmp.LockBits(new Rectangle(0, 0, bmp.Width, bmp.Height), ImageLockMode.ReadWrite, bmp.PixelFormat); 
   Marshal.Copy(ms.Buffer, 0, bmpData.Scan0, GetBitmapSize(bmp, vih.bmiHeader.biBitCount)); 
   bmp.UnlockBits(bmpData); 
 
   // flip the upside down buffer 
   bmp.RotateFlip(RotateFlipType.Rotate180FlipX); 
 
   // save the image 
   bmp.Save(outFile, ImageFormat.Bmp); 
   return bmp; 
} 
 
private PixelFormat FormatFromBitCount(int bitCount) 
{ 
   switch (bitCount) 
   { 
      case 8: 
         return PixelFormat.Format8bppIndexed; 
      case 16: 
         return PixelFormat.Format16bppRgb555; 
      case 32: 
         return PixelFormat.Format32bppRgb; 
      case 48: 
         return PixelFormat.Format48bppRgb; 
      case 24: 
         return PixelFormat.Format24bppRgb; 
   } 
   throw new Exception("Unrecognized bit count"); 
} 
 
private int GetBitmapSize(Bitmap bmp, int bitCount) 
{ 
   int pixelSize = (int)Math.Log((double)bitCount); 
   return (bmp.Width * pixelSize + pixelSize & ~3) * bmp.Height; 
} 
 
private int GetBitmapScanRowSize(int bmpSize, int stride, int width) 
{ 
   return bmpSize / (stride / width); 
} 
 
static class LEAD_VARS 
{ 
   public const string MediaDir = @"C:\LEADTOOLS22\Media"; 
}

Requirements

Target Platforms

Reference

MediaType Class

MediaType Members

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Help Version 22.0.2022.12.7

Leadtools.Multimedia Assembly

Introduction

Getting Started

Namespaces

Leadtools.Multimedia Namespace

Leadtools.Multimedia.Common Namespace

Assemblies