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• Need to write to a file using fopen in a C++ class for iOS project

  2 mai 2014, par Chuck Mc Duran

  I have a project that uses C++ classes and FFmpeg, I need to use fopen and write a file to the app sandbox, so the code that I need to write in C++ is the equivalent of :

  NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
  
  NSString *docs_dir = [paths objectAtIndex:0];

  This would me to my app sandbox, where I can pretty much manipulate my files
  The question is how do I go about writing this code in C++ so that I can use fopen on a file ?

  This is the method that needs implementation :

  int testGrabAndWrite(const char* streamURL, bool decode, const char* filename)
  
  {
  
      FILE *outfile;
  
      int ret;
  
      int counter = 0;
  
      uint8_t *data;              // Pointer to the received audio mem
  
      int size;                   // Size of the received audio buffer
  
  
  
  
  
      outfile = fopen(filename, "w");
  
  
  
      if (outfile == NULL)
  
          exit(1);
  
  
  
      // Open the RTP stream
  
      if ((ret = openStream(streamURL, decode)) < 0)
  
          return ret;
  
  
  
      // Print out info about the stream found
  
      int tmpSampleRate, tmpBitRate, tmpChannels;
  
      ret = getStreamInfo(tmpSampleRate, tmpBitRate, tmpChannels);
  
      printf("\nSample rate:%d Bit rateL%d Channels:%d\n",tmpSampleRate,tmpBitRate, tmpChannels);
  
  
  
      // Grab some sample data and write it to file.
  
      while (counter < 500) 
  
      {
  
          ret = getStreamData(data, size);
  
          fwrite(data, 1, size, outfile);                             // Write RTP packets, i.e. mp3, to file.
  
          printf("Wrote packet %d with size %d which returned %d. ", ++counter, size, ret);
  
      }
  
  
  
      fclose(outfile);
  
      closeStream();
  
  
  
      return ret;
  
  }

• Creating OpenCV project with no Video Transcoding (ffmpeg part) Support on Linux how to ?

  24 novembre 2011, par myWallJSON

  Currently I use something like this to create project make files :

  cmake -DCMAKE_INSTALL_PREFIX="./install-dir" -DBUILD_WITH_STATIC_CRT=ON -DBUILD_SHARED_LIBS=OFF -G "GCC" 

  And I use FFmpeg in my project that I compile sepratly. Also I do not like the way OpenCV workes with video transcoding any way - prefer to do it all manually with ffmpeg.

  I wonder if it is possible to create project file using Cmake so that OpenCV video (not images like png, jpg, tiff, etc) transcoding part will not be compiled (not camera grabbing - I like and use that one=)) ?

• Update themerollered demo to use tooltip to show errors as overlay.

  22 novembre 2011, par Jörn Zaefferer

  m demo/themerollered.html Update themerollered demo to use tooltip to show errors as overlay.