Hello everyone.
I have a DVR (digital video recorder) program I wrote in Windows that I
want to re-write on the Mac. And I wanted to get some ideas about how
best to use Cocoa objects to make this program work as I'm still
relatively new to Cocoa programming.
The application has 2 modes, one is capturing video from a camera of any
sort, a NTSC capture card, usb, ethernet, etc, that isn't a big deal since
that'd just be its own thread. However I want to display the incoming
video live on screen with the minimum of CPU loading as well as being able
to scale the data and do some basic manipulations on it, perhaps including
whats in Core Image. The incoming data is often >8-bit monochrome and
needs to be scaled to 8-bit grey for screen display.
The other mode is playing back a file, either frame by frame or playing
back the video at a user settable frame rate.
I'd like to be able to have multiple sets of both open at once.
Another question related to this is what API set provides the fastest disk
IO under Mac OS X? On the windows side I used FILE_FLAG_NO_BUFFERING and
FILE_FLAG_WRITE_THROUGH flags with the ReadFile/WriteFile API.
My thoughts are perhaps NSDocument with NSView's that use Core Animation
for displaying everything assuming there is a way to sequence bitmaps into
Core Animation. But perhaps there is a better way? Also I might want to
do secondary floating windows that display histograms or camera controls,
etc.
The file formats are a proprietary format and not related to Quicktime or
Windows Media, etc.
Thanks
-Marek
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