[libdv-dev] Grabbing frames with libdv

[Mert T. <mer...@va...>]

Dear Developers, 

I need to grab frames from a DV camera, do some real time image
processing and display them in a GUI. I beleive that libraw1394 captures
the data and I should use libdv to decode that compressed DV data to RGB
pixel format.  

I have been using libraw1394 library to get the data from a Sony DV
camera. This basically captures the DV compressed data. Each time a
frame comes, it goes into a handler function to process the frame data.
However, I couldn't find a way to convert that data to RGB pixel format
so that I can show the frames in a GUI. The handler function gets a
pointer to the beginning of the frame data as an argument and a length
argument, which is the length of the data in bytes(not including
isochronous header) but the data is a DV compressed data I presume,
which needs to be decoded. There is a function called 'dv_parse_header'
which accepts a buffer pointer argument and it is the first function to
be called after setting up your decoder; however, there is no length
argument for that function. I tried this function in my code but it
returned -1 as an error. 
I looked at the source code of kino; however I couldn't find where it
sets up the decoder and do parsing. I am sure that there must be a lot
of people doing this process. It would be awesome if you can provide me
a sample code or an explanation to do this.
Thank you very much for your help and time.