Mac Forum / Programming / Mac Programming / June 2005

Hi,

I am using Quicktime SDK 6. I want to extract and decompress the frames
from the mov files. Currently, i am able to get the media samples using
GetMediaSample function from the mov file but it is compressed data.
How can i decompress that sample data. Do i have to use DecompressImage
function? If yes, then how can i get the ImageDescriptionHandle
parameter.

This is the part of my code
strcpy(szFileName, "c:\\test.mov");
// Convert pathname and make  FSSpec
oErr = NativePathNameToFSSpec(szFileName, &fss, 0);
// Open movie file
oErr = OpenMovieFile(&fss, &nFileRefNum, fsRdPerm);
oErr = NewMovieFromFile(&movie, nFileRefNum, nil, nil, newMovieActive,
nil);
lTrackCount = GetMovieTrackCount(movie);
theTrack = GetMovieIndTrack(movie, 1);
theMedia = GetTrackMedia(theTrack);
lDuration = GetMediaDuration(theMedia);
lMaxSize = GetMediaDataSize(theMedia, 0, lDuration);
outdata = NewHandle(lMaxSize);

GetMediaHandlerDescription(theMedia, &mediaType, nil, nil);
  if (mediaType == VideoMediaType)
  {
     for (i = 0; i < lDuration; i++)
     {
        oErr = GetMediaSample(theMedia, outdata, lMaxSize, &lSize, i,
&st, &dps, nil, &sampleDescriptionIndex,
                       1, &numberOfSamples, &sampleFlags);
     }
     DisposeHandle(outdata);
  }

Thanks,