Re: [Q] How to retrieve FourCC code for a video track?
Re: [Q] How to retrieve FourCC code for a video track?
- Subject: Re: [Q] How to retrieve FourCC code for a video track?
- From: JongAm Park <email@hidden>
- Date: Fri, 7 Aug 2009 10:55:00 -0700
Well.... I would answer to my own question..
With help of a "dumpster", I figured out where the codec fourCC was stored and what data chunk should be retrieved.
So....
QTMovie *movie;
NSError *error;
NSURL *movieFileURL;
NSDictionary *movieAttributes;
NSString *samplePathURL = [NSString stringWithString:@"file://localhost/Volumes/Work/Sample Video/pimpmyride_DVCPROHD-720p60-dvhp.mov"];
NSString *trimmedURL = [samplePathURL stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSRange fileLocalHostRange = [trimmedURL rangeOfString:@"file://localhost" options:NSLiteralSearch];
fileLocalHostRange.location; fileLocalHostRange.length;
NSString *finalPathString = [trimmedURL substringFromIndex:fileLocalHostRange.location+fileLocalHostRange.length];
//movieFileURL = [NSURL fileURLWithPath:@"/Volumes/Work/Sample Video/pimpmyride_DVCPROHD-720p60-dvhp.mov"];
movieFileURL = [NSURL fileURLWithPath:finalPathString];
movie = [QTMovie movieWithURL:movieFileURL error:&error];
BOOL isVideoTrack = NO;
if (movie)
{
NSMutableString *trackFormatStr = [NSMutableString string];
NSArray *tracksArray = [movie tracks];
int i, tracks = [tracksArray count];
for (i=0; i<tracks; ++i)
{
QTTrack *track = [tracksArray objectAtIndex:i];
NSDictionary *attribute = [track trackAttributes];
NSString *trackTypeString = [attribute objectForKey:QTTrackDisplayNameAttribute];
isVideoTrack = [trackTypeString isEqualToString:@"Video Track"];
if( isVideoTrack )
{
NSString *codecString = [attribute objectForKey:QTTrackFormatSummaryAttribute];
NSRange aRange;
NSLog( @"Track %d : %@", i, codecString );
aRange = [codecString rangeOfString:@"DVCPRO HD 720p60"];
if( aRange.location != NSNotFound )
NSLog( @"dvhp");
/************** From here, it will retrieve the SampleDescriptionHandle *******************/
QTMedia *videoMedia = [track media];
NSDictionary *mediaAttribute = [videoMedia mediaAttributes];
NSLog(@"media attribute : %@", mediaAttribute );
SampleDescriptionHandle videoTrackDescH = (SampleDescriptionHandle)NewHandle( sizeof(Handle) );
GetMediaSampleDescription([videoMedia quickTimeMedia], i, videoTrackDescH );
NSLog(@"depth : %d",(*(ImageDescriptionHandle)videoTrackDescH)->depth );
NSLog(@"width : %d",(*(ImageDescriptionHandle)videoTrackDescH)->width );
NSLog(@"height : %d",(*(ImageDescriptionHandle)videoTrackDescH)->height );
NSLog(@"name : %s",(*(ImageDescriptionHandle)videoTrackDescH)->name );
NSLog(@"codec : %d",(*(ImageDescriptionHandle)videoTrackDescH)->cType );
char codecType[5];
bzero(codecType, 5);
OSType codecTypeNum;
memcpy((void *)&codecTypeNum, (const void *)&((*(ImageDescriptionHandle)videoTrackDescH)->cType), 4);
codecTypeNum = EndianU32_LtoB( codecTypeNum );
memcpy(codecType, (const void*)&codecTypeNum, 4);
NSLog(@" == %s", codecType );
/**************************************************************/
}
}
}
By the way, is there any safe way to remove the line where NewHandle() is called? Because it is not recommended to be used, I would like to remove it.
However, GetMediaSampleDescription() call looks to ask an allocated new handle.
Thank you.
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