[HELP]DirectShow : SampleGrabber + libjpeg

long nBufferSize = am_media_type.lSampleSize;
	JSAMPLE *JBuffer = (JSAMPLE*)malloc(nBufferSize);
	long *pBuffer = (long *)malloc(nBufferSize);

	// grab image data.
	pSampleGrabber->GetCurrentBuffer(&nBufferSize, (long *)pBuffer);

	memcpy((void*)&JBuffer,(void*)&pBuffer, sizeof(pBuffer));
	


	const char filename[] = "test.jpg";
	int quality = 100;

	
  struct jpeg_compress_struct cinfo;
  
  struct jpeg_error_mgr jerr;
  /* More stuff */
  FILE * outfile;		/* target file */
  JSAMPROW row_pointer[1];	/* pointer to JSAMPLE row[s] */
  int row_stride;		/* physical row width in image buffer */



  
  cinfo.err = jpeg_std_error(&jerr);

  jpeg_create_compress(&cinfo);

 
  if ((outfile = fopen(filename, "wb")) == NULL) {
    fprintf(stderr, "can't open %s\n", filename);
    exit(1);
  }
  jpeg_stdio_dest(&cinfo, outfile);

  
 
  cinfo.image_width = pVideoInfoHeader->bmiHeader.biWidth; 	
  cinfo.image_height = pVideoInfoHeader->bmiHeader.biHeight;
  cinfo.input_components = 3;		/* # of color components per pixel */
  cinfo.in_color_space = JCS_RGB; 	/* colorspace of input image */
 
  jpeg_set_defaults(&cinfo);
  
  jpeg_set_quality(&cinfo, quality, TRUE /* limit to baseline-JPEG values */);

  
  jpeg_start_compress(&cinfo, TRUE);


  row_stride = cinfo.image_width * 3;	/* JSAMPLEs per row in image_buffer */

  while (cinfo.next_scanline < cinfo.image_height) {
  
    row_pointer[0] = & JBuffer[cinfo.next_scanline * row_stride];
  (void) jpeg_write_scanlines(&cinfo, row_pointer, 1);
  }



  jpeg_finish_compress(&cinfo);

  fclose(outfile);




  jpeg_destroy_compress(&cinfo);