/* returns the ImageDescriptionHandle for the track.
If it's not a video track, return NULL
*/
static ImageDescriptionHandle track_image_description(VALUE obj)
{
OSErr osErr;
/* restrict reporting to video track */
if (track_get_media_type(obj) != VideoMediaType)
return NULL;
SampleDescriptionHandle sample_description = NULL;
sample_description = (SampleDescriptionHandle)NewHandle(sizeof(SampleDescription));
if (LMGetMemErr() != noErr) {
rb_raise(eQuickTime, "Memory Error %d when determining image description", LMGetMemErr());
return NULL;
}
GetMediaSampleDescription(TRACK_MEDIA(obj), 1, sample_description);
osErr = GetMoviesError();
if (osErr != noErr) {
rb_raise(eQuickTime, "Movie Error %d when determining image description", osErr);
DisposeHandle((Handle)sample_description);
return NULL;
}
return (ImageDescriptionHandle)sample_description;
}
OSErr MemError(void)
{
OSErr err = LMGetMemErr();
LMSetMemErr(noErr);
return err;
}
