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Video output through firewire

Subject: Video output through firewire
From: Vasilios Hatciliamis <email@hidden>
Date: Sat, 1 Jul 2006 02:52:43 +0200
Delivered-to: email@hidden
Delivered-to: email@hidden

Hi!

I've posted this some months ago and I still haven't got it to work.

I'm trying to play .dv files through firewire to a DV-cam from Cocoa.

I can get the display on the DV-cam connected to the computer to turn black, so it seams I have managed to choose the correct output component. But when I start to play a movie I doesn't show up on the display of the DV-Cam. I know the movie is playing because I can hear the audio from the computer's speakers.

I have taken most of the code from the SimpleVideoOut example code.
The SimpleVideoOut example code works fine with the same DV-cam.

Here is my code:

------------------------------------------------------------------------ -------------------------------

#import "Orama.h"


@implementation Orama

-(void)awakeFromNib {

EnterMovies();

Movie myMovie = OpenMovie((CFStringRef)@"/Users/xxx/Movies/ Untitled3-1.dv");


GWorldPtr						displayGWorld;
OSErr							myErr;
ComponentInstance				_displayComponent;
ComponentInstance				mVideoOutputClockInstance;
ComponentDescription			cd;
Component						c;

_displayComponent = NULL;

cd.componentType = QTVideoOutputComponentType;
cd.componentSubType = 'fire';
cd.componentManufacturer = 'appl';
cd.componentFlags = 0;
cd.componentFlagsMask = QTVideoOutputSetDisplayMode;
c = FindNextComponent(c, &cd);

if (c == NULL) {
goto bail;
}

_displayComponent = OpenComponent(c);
if (_displayComponent == NULL) {
myErr = internalComponentErr;
goto bail;
}

QTVideoOutputSetClientName(_displayComponent, "DV Exporter");

myErr = QTVideoOutputSetDisplayMode(_displayComponent,2); //NOTE: 1 = NTSC and 2 = PAL if (myErr != noErr) goto bail;

myErr = QTVideoOutputBegin(_displayComponent);
if (myErr != noErr) goto bail;

myErr = QTVideoOutputGetGWorld(_displayComponent, &displayGWorld);
if (myErr != noErr) goto bail;

myErr = QTVideoOutputGetClock( _displayComponent, &mVideoOutputClockInstance ); if (myErr != noErr) goto bail;

SetMovieMasterClock( myMovie, (Component)mVideoOutputClockInstance, (TimeRecord*)NULL );

SetMovieVideoOutput(myMovie, _displayComponent);

SetMovieGWorld(myMovie, displayGWorld, nil);

StartMovie (myMovie);

return;

bail: {
NSLog(@"bail!");
}


Movie OpenMovie(CFStringRef inPath) {
Movie    myMovie = NULL;
OSType   myDataRefType;
Handle   myDataRef = NULL;
short    myResID = 0;
OSErr    myErr = noErr;

// create the data reference myErr = QTNewDataReferenceFromFullPathCFString(inPath, kQTNativeDefaultPathStyle, 0, &myDataRef, &myDataRefType); if (myErr != noErr) goto bail;

// get the Movie myErr = NewMovieFromDataRef(&myMovie, newMovieActive | newMovieAsyncOK, &myResID, myDataRef, myDataRefType); if (myErr != noErr) goto bail;

// dispose of the data reference handle - we no longer need it
DisposeHandle(myDataRef);


return myMovie;

bail: {
NSLog(@"bail!");
return nil;
}

@end
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