CreateNewMutualExclusion Method

using Leadtools; 
using Leadtools.Multimedia; 
using LeadtoolsMultimediaExamples.Fixtures; 
 
 
public bool _result = false; 
public ConvertCtrlForm _form = new ConvertCtrlForm(); 
 
const int CODEC_AUDIO_MSAUDIO = 353;       //  Microsoft WMAudio 
const int CODEC_VIDEO_WMV1 = 827739479;    //  FOURCC( 'W', 'M', 'V', '1' )  
 
public void AddStreamExample() 
{ 
   ConvertCtrl convertctrl = _form.ConvertCtrl; 
   string inFile = Path.Combine(LEAD_VARS.MediaDir, "ConvertCtrl_Source1.avi"); 
   string outFile = Path.Combine(LEAD_VARS.MediaDir, "WMProfile_AddStreamExample.avi"); 
 
   try 
   { 
      WMProfileManager manager = new WMProfileManager(); 
 
      // create a WMProfile 
      convertctrl.WMProfile = CreateCustomProfile(manager); 
 
      // run the conversion 
      convertctrl.SourceFile = inFile; 
      convertctrl.TargetFormat = TargetFormatType.WMV; 
      convertctrl.TargetFile = outFile; 
      convertctrl.StartConvert(); 
 
      // dispose of the manager 
      manager.Dispose(); 
   } 
   catch (Exception) 
   { 
      _result = false; 
   } 
 
   // 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. 
   while (convertctrl.State == ConvertState.Running) 
      Application.DoEvents(); 
 
   // check the validity of the output file 
   MediaInfo mediaInfo = new MediaInfo(); 
   try 
   { 
      mediaInfo.SourceFile = outFile; 
      if (mediaInfo.SourceFormat == SourceFormatType.WMV) 
         _result = true; 
   } 
   catch (Exception) 
   { 
      _result = false; 
   } 
} 
 
private WMProfile CreateCustomProfile(WMProfileManager manager) 
{ 
   WMProfile profile = manager.CreateEmptyProfile(WMT_Version.V9); 
   profile.Name = "Custom Profile"; 
   profile.Description = "Custom Profile Description"; 
 
   bool added = AddAudioStream(manager, profile, 1, CODEC_AUDIO_MSAUDIO, 8000, 8000, 1, true); 
 
   // add 5 video streams with bitrates starting from 32KB/s (256Kbps). Increase the bitrate if you increase the video size 
   for (int i = 0; i <= 4; i++) 
      AddVideoStream(manager, profile, (2 + i), CODEC_VIDEO_WMV1, 
                     (1024 * 32) + i * 1024, 400, 300, 5 * (i + 1), 0, 8); 
 
   //  mark all the video streams for mutual exclusion 
   AddMutexObject(profile, 2, 5); 
   return profile; 
} 
 
private bool AddVideoStream(WMProfileManager manager, 
                            WMProfile profile, 
                            int streamnum, 
                            long fourcc, 
                            int bitrate, 
                            int width, 
                            int height, 
                            int fps, 
                            int quality, 
                            int secperkey) 
{ 
   WMStreamConfig codecformat; 
   MediaType mediatype; 
   VideoInfoHeader vih; 
   bool candidate = false; 
   VideoInfoHeader candidatevih = new VideoInfoHeader(); 
   MediaType candidatemt = null; 
   WMStreamConfig candidatestream = null; 
   bool added = false; 
   byte[] viharr = new byte[88]; 
   int codecs = manager.GetCodecInfoCount(Constants.MEDIATYPE_Video); 
   string sinfo = string.Empty; 
 
   // width and height must be even 
   if ((width & 1) != 0) 
      width++; 
   if ((height & 1) != 0) 
      height++; 
 
   //  search for matching codec until I find a candidate 
   for (int codecindex = 0; codecindex < codecs && !candidate; codecindex++) 
   { 
      sinfo += manager.GetCodecName(Constants.MEDIATYPE_Video, codecindex); 
      int formats = manager.GetCodecFormatCount(Constants.MEDIATYPE_Video, codecindex); 
 
      for (int formatindex = 0; formatindex < formats; formatindex++) 
      { 
         sinfo += manager.GetCodecFormatDesc(Constants.MEDIATYPE_Video, codecindex, formatindex); 
         codecformat = manager.GetCodecFormat(Constants.MEDIATYPE_Video, codecindex, formatindex); 
         mediatype = codecformat.GetMediaType(); 
 
         if (mediatype.FormatType == Constants.FORMAT_VideoInfo) 
         { 
            vih = mediatype.GetVideoFormatData(); 
            if (vih.bmiHeader.biCompression == fourcc) 
            { 
               candidate = true; 
               candidatevih = vih; 
               candidatemt = mediatype; 
               candidatestream = codecformat; 
               // stop searching if I found a candidate 
               break; 
            } 
         } 
      } 
   } 
   if (candidate) 
   { 
      //  modify the selected codec to support this bitrate and size 
      candidatevih.dwBitRate = bitrate; 
      candidatevih.rcSource.Right = width; 
      candidatevih.rcSource.Bottom = height; 
      candidatevih.rcTarget.Right = width; 
      candidatevih.rcTarget.Bottom = height; 
      candidatevih.bmiHeader.biWidth = width; 
      candidatevih.bmiHeader.biHeight = height; 
      // since fps is integer, 10000000/fps always fits in a 32-bit value, so lowpart=10000000/fps and high part is always 0 
      candidatevih.AvgTimePerFrame.lowpart = 10000000 / fps; 
      candidatevih.AvgTimePerFrame.highpart = 0; 
 
      StructToByteArray(candidatevih, ref viharr); 
 
      // candidatevih is a copy of the media type, so updating candidatevih is not enough to update the media type. 
      // Call SetVideoFormatData to copy the updated information from candidatevih to the video format data inside candidatemt 
      // If you just change candidatevih without calling candidatemt.SetVideoFormatData,  
      // candidatemt is an empty media type with no width and height 
      candidatemt.SetVideoFormatData(candidatevih, null, 0); 
 
      candidatestream.Quality = quality; 
      candidatestream.MaxKeyFrameSpacing = secperkey; 
      candidatestream.StreamNumber = streamnum; 
      candidatestream.StreamName = "Video Stream"; 
      candidatestream.ConnectionName = "Video"; 
      candidatestream.Bitrate = bitrate; 
      candidatestream.SetMediaType(candidatemt); 
      profile.AddStream(candidatestream); 
      added = true; 
   } 
   return added; 
} 
 
private bool AddAudioStream(WMProfileManager manager, 
                            WMProfile profile, 
                            int streamnum, 
                            int formattag, 
                            int prefbitrate, 
                            int samplespersec, 
                            int channels, 
                            bool withvideo) 
{ 
   WMStreamConfig codecformat; 
   MediaType mediatype; 
   WaveFormatEx wfex = new WaveFormatEx(); 
   bool added = false; 
   bool candidate = false; 
   WaveFormatEx candidatewfex = new WaveFormatEx(); 
   MediaType candidatemt = null; 
   MediaType mt; 
   WMStreamConfig stream; 
   int codecs = manager.GetCodecInfoCount(Constants.MEDIATYPE_Audio); 
 
   //  search for matching codec 
   for (int codecindex = 0; codecindex < codecs; codecindex++) 
   { 
      int formats = manager.GetCodecFormatCount(Constants.MEDIATYPE_Audio, codecindex); 
      for (int formatindex = 0; formatindex < formats; formatindex++) 
      { 
         codecformat = manager.GetCodecFormat(Constants.MEDIATYPE_Audio, codecindex, formatindex); 
         mediatype = codecformat.GetMediaType(); 
         if (mediatype.FormatType == Constants.FORMAT_WaveFormatEx) 
         { 
            ByteArrayToStruct(mediatype.Format, ref wfex); 
 
            int diff = ((wfex.nAvgBytesPerSec * 8) - prefbitrate); 
            if (diff < 250 && diff > -250 
                && wfex.nSamplesPerSec == samplespersec 
                && wfex.nChannels == channels 
                && wfex.wFormatTag == formattag) 
            { 
               if (candidate) 
               { 
                  if (withvideo) 
                  { 
                     //  
                     //  For audio/video configurations, we want to 
                     //  find the smaller blockalign. In this case,  
                     //  the blockalign is larger, so we want to 
                     //  use the old format.  
                     if (wfex.nBlockAlign <= candidatewfex.nBlockAlign) 
                     { 
                        candidatewfex = wfex; 
                        candidatemt = mediatype; 
                     } 
                  } 
                  else if (wfex.nBlockAlign >= candidatewfex.nBlockAlign) 
                  { 
                     candidatewfex = wfex; 
                     candidatemt = mediatype; 
                  } 
               } 
               else 
               { 
                  candidate = true; 
                  candidatewfex = wfex; 
                  candidatemt = mediatype; 
               } 
            } 
         } 
      } 
   } 
 
   if (candidate) 
   { 
      //  modify the selected codec to support this bitrate and format 
      mt = new MediaType(); 
      mt.Type = Constants.MEDIATYPE_Audio; 
      mt.SubType = "{" + String.Format("{0:X8}", formattag) + "-0000-0010-8000-00AA00389B71}"; 
      mt.FixedSizeSamples = true; 
      mt.TemporalCompression = false; 
      mt.SampleSize = candidatewfex.nBlockAlign; 
      mt.FormatType = Constants.FORMAT_WaveFormatEx; 
      mt.SetFormatData(-1, candidatemt.Format); 
      stream = profile.CreateNewStream(Constants.MEDIATYPE_Audio); 
      stream.StreamNumber = streamnum; 
      stream.StreamName = "Audio Stream"; 
      stream.ConnectionName = "Audio"; 
      stream.Bitrate = (candidatewfex.nAvgBytesPerSec * 8); 
      stream.SetMediaType(mt); 
      profile.AddStream(stream); 
      profile.ReconfigStream(stream); 
      added = true; 
   } 
 
   return added; 
} 
 
private void StructToByteArray(object o, ref byte[] dest) 
{ 
   try 
   { 
      //convert the structure to a byte array 
      int rawSize = Marshal.SizeOf(o); 
      GCHandle handle = new GCHandle(); 
      IntPtr buffer; 
 
      handle = GCHandle.Alloc(dest, GCHandleType.Pinned); 
      buffer = handle.AddrOfPinnedObject(); 
      Marshal.StructureToPtr(o, buffer, false); 
      handle.Free(); 
   } 
   catch (Exception ex) 
   { 
      throw ex; 
   } 
} 
 
private void ByteArrayToStruct(object buffer, ref WaveFormatEx vih) 
{ 
   try 
   { 
      GCHandle handle = new GCHandle(); 
 
      //convert the structure to a byte array 
      handle = GCHandle.Alloc(buffer, GCHandleType.Pinned); 
      IntPtr ptr = handle.AddrOfPinnedObject(); 
      vih = (WaveFormatEx)Marshal.PtrToStructure(ptr, typeof(WaveFormatEx)); 
      handle.Free(); 
   } 
   catch (Exception ex) 
   { 
      throw ex; 
   } 
} 
 
private bool AddMutexObject(WMProfile profile, int basestream, int streamcount) 
{ 
   WMMutualExclusion excl = profile.CreateNewMutualExclusion(); 
 
   //  indicate that the streams differ by bit rate 
   excl.Type = "{D6E22A01-35DA-11D1-9034-00A0C90349BE}"; 
   for (int i = 0; i < streamcount; i++) 
      excl.AddStream(basestream + i); 
 
   //  assign the exclusion object to the profile 
   profile.AddMutualExclusion(excl); 
   return true; 
} 
 
 
 
static class LEAD_VARS 
{ 
   public const string MediaDir = @"C:\LEADTOOLS23\Media"; 
}