[MPlayer-dev-eng] Need a guide to implement a codec library using hardware video codec

[Lee Kwangwoo]

The modified code of the mplayer will be released under the GPL. 
But I have one question about codec library. If I write a library for a
hardware device which can be used to control the hardware device
commonly and which can also be used with mplayer, is it released under
the GPL license?

In my situation, I can not open the control code of the hardware device.
If I must release the hardware codec library under the GPL license, I
should rethink using mplayer code. Should I implement whole things?
well.. get permission from my boss???

Let me know the right solution about this situation, please.
Thank you.

Kwangwoo Lee

On Monday, April 21, 2008 9:25 AM, Raindel <shacharr at gmail.com>
Wrote:
> Small GPL warning:
> 
> Make sure that your company is aware to the fact that MPlayer is
> licensed only through a GPL license.
> 
> IANAL, so I am not sure what exactly is needed for you to comply with
> said license, though I am rather sure that releasing all of the source
> code of your modified version of MPlayer is part of this. Take that
> into account while working on this project - the MPlayer/ffmpeg gang
> is well known for chasing GPL violators.
> 
> --Shachar
> 
> On Tue, Apr 15, 2008 at 3:50 AM, Lee Kwangwoo <kwlee at mtekvision.com>
> wrote:
> > > -----Original Message-----
> >  > From: mplayer-dev-eng-bounces at mplayerhq.hu
[mailto:mplayer-dev-eng-
> >  > bounces at mplayerhq.hu] On Behalf Of Compn
> >  > Sent: Monday, April 14, 2008 9:17 PM
> >  > To: mplayer-dev-eng at mplayerhq.hu
> >  > Subject: Re: [MPlayer-dev-eng] Need a guide to implement a codec
> >  library
> >  > using hardware video codec
> >  >
> >  > On Mon, 14 Apr 2008 14:04:38 +0900, Lee Kwangwoo wrote:
> >  > >Hello,
> >  > >
> >  > >I'm porting the mplayer with a hardware video codec in a SoC.
> >  >
> >  > which project is this for?
> >
> >  This project is for my company, which makes ARM based mobile
processor
> >  including hardware video codec.
> >
> >
> >  > >It is capable of decoding H.264 and MPEG4. It can also encode
frame
> >  > >with such formats.
> >  > >
> >  > >In the libmpcodecs/vd.c you explicitly note a comment - "do not
add
> >  any
> >  > >new decoders here" for mpcodes_vd_drivers[]. So if I use the
> >  > >libavcodec/h264.c, should I replace that file with my own
decoder
> >  file
> >  > >or add feature to support a hardware decoder with a define
macro?
> >  >
> >  > this just means that any new codecs should go into libavcodec
from
> >  > ffmpeg. if you are porting mplayer to a new hardware device, you
can
> >  > ignore this warning.
> >
> >  Thank you for your guide.
> >
> >
> >  > >I think that I need to replace the functions, for example -
> >  > >decode_nal_units(), because the hardware decoder requires one
frame
> >  > >starting with nal header and output a decoded YUV420 frame.
> >  > >
> >  > >Any comments and guide will be very helpful.
> >  > >Thank you,
> >  > >
> >  > >Kwangwoo Lee
> >  >
> >  > good luck
> >  >
> >  > -compn
> >
> >  Thank you.
> >
> >  Kwangwoo Lee
> >
> >
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> >
>