[libdv-dev] RE: xdvplay 0.2 is available

[Arne S. <ar...@sc...>]

Well, I didn't actually wrote the xdvplay program, I just added a couple of 
calls to my AVI library to the existing playdv.c program.

Here is what I think is needed most:


1. make a library. That shouldn't be too difficult. Just put all your *.o files 
into a lib and write a public header file. Please make it g++ compatible from 
the start (early versions of libraw suffered from the same problem and the 
author had to fix it). My first guess would be int dv_decode(void 
*compressed_data, void *uncompressed_data, struct some_dv_info *info). The info 
struct should have some basic information like width, height, result code etc. 
The pointer compressed_data is one full frame of NTSC or PAL data. 
Uncompressed_data should be the RGB format as it is used in playdv.c right now.

This would be the first thing to do, just to allow other people start working. 
If we have this I would try to merge it with an existing player software like 
xanim for example.


2. make a video4linux compatible framework. I do not have any experience with 
v4l or v4l2, but since it is supposed to be a general purpose framework, we 
should extend it such that a camcorder with the ieee1394 subsystem and libdv 
codec can be used just as any other TV frame grabbing card. Only with superior 
quality of course.
When I have my SuSE 6.4 DVD (due May 10), I am going to buy a TV card and play 
with this whole v4l thing and also with broadcast2000. Right now my system is 
so outdated that these programs do not work at all. Dvgrab runs fine though...


3. Broadcast2000 support. I did not try it yet, don't know what is required for 
supporting it, but having DV support in broadcast2000 would be very cool.


4. Stability, Quality. Right now libdv is a bit, er... , sensitive to its input 
data. If  it is invalid data it just crashes. The DV data stream from a 
camcorder is not guaranteed to be error-free, packets may be dropped, the 
program should not crash if it is feed with wrong data.


Arne

-----Original Message-----
From:	Erik Walthinsen [SMTP:om...@cs...]
Sent:	Monday, May 01, 2000 1:21 AM
To:	Arne Schirmacher
Cc:	lib...@li...
Subject:	Re: xdvplay 0.2 is available

On Sun, 30 Apr 2000, Arne Schirmacher wrote:

> This is a slightly modified version of the playdv.c program from the libdv
> project. This version now reads AVI files instead of plain DV data files.

The plan is to convert libdv into a real library in the near future.
Since you've actually written an application with it, you're probably good
resource for ideas on the exact API.  What are your thoughts on that
matter?  Check the archives for a few ideas (at least, it's supposed to be
in the archives, let me know if you can't find it) we've had so far.

         Erik Walthinsen <om...@cs...> - Staff Programmer @ OGI
        Quasar project - http://www.cse.ogi.edu/DISC/projects/quasar/
   Video4Linux Two drivers and stuff - http://www.cse.ogi.edu/~omega/v4l2/
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