video input device selection

Hello all:

 

I’m hoping someone can help me with the following.

 

I’m developing a video capture stack based on the QuickTime SDK. I have multiple video input devices connected (1394 + USB). I’m able to enumerate all the devices correctly, but unable to select a specific device using the SGSetChannelDevice() function.   Below is my code snippet to do this. Any help would be most appreciated.

 

 

err = EnterMovies();

 

gSeqGrab = OpenDefaultComponent(SeqGrabComponentType, 0);

 

err = SGInitialize(gSeqGrab);

 

err  = SGNewChannel(gSeqGrab, VideoMediaType, &gVideoChan);

 

err = SGGetChannelDeviceList(gVideoChan, sgDeviceListIncludeInputs, &gDeviceList);

 

bHasInputDevices = ((*gDeviceList)->entry[i].flags) & sgDeviceNameFlagShowInputAsDevices;

 

theSGInputList = ((SGDeviceName*)(&((*gDeviceList)->entry[i])))->inputs;

 

 

if (bHasInputDevices)

{

            // I am able to build out the list correctly. Number of inputs = (*gDeviceList)->count

 

// Just for testing purposes, I try to “bind” the first device I find.

 

printf(“Device Name = \t%s\n”, (*theSGInputList)->entry[0].name);    // this does print out the correct name in the console log…

 

            err = SGSetChannelDevice(gVideoChan, (*theSGInputList)->entry[0].name);

}

 

SGSetChannelDevice returns an error of -50, which is paramErr  Invalid parameter value.

 

 

Thanks for any insight provided.

 

-Mike