[FFmpeg-devel] [PATCH 5/5] avformat: add sdr support

Paul B Mahol onemda at gmail.com
Sun Jun 18 14:46:05 EEST 2023

On Sat, Jun 17, 2023 at 8:37 PM Michael Niedermayer <michael at niedermayer.cc>

> On Sat, Jun 17, 2023 at 08:08:11PM +0200, Paul B Mahol wrote:
> [...]
> > Which library handles compressed stuff?
> For digital stuff like DAB/DVB/...
> sdrdemux in libavformat will demodulate, do error correction then return
> AVPacket
> with H.264 / Mpeg2 video or AAC or wahetever
> That then will get passed to libavcodec, same as with any other demuxer.
> This code is not written yet. There is just analog AM demodulation. I
> posted
> this patch as soon as the first usecase worked
> usecase was "listen to random AM radio stations in ffplay" :)
> and it can also grab all AM stations in a 10Mhz window and demodulate all
> (that 10mhz is what my hw and usb bandwidth can do max)
> I intend to add FM demodulation, because it seems a fun thing to try to do.
> someone will need to add DAB/DVB support, I would be happy if someone else
> comes forth to do that. If noone does ill think about if i want to do it
> or not once FM is done and once this is in git.
> The initial reaction from some was a bit spicy, so i need to think
> how much fun this is in FFmpeg.
> But one thing i can say for sure, is, if i cannot use this in ffplay
> then it makes no sense for me to put more time into it
> We could implement seeking to next/previous stations differently but
> it seems a bit like creating extra work for everyone.
> I mean a new API in sdrdemux then ffplay needs to support that and then
> other players would need to support it and so on. While really the
> seeking on a realtime input has no other use
Sorry, but you are making and adding more and more unacceptable hacks.

> thx
> [...]
> --
> Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
> Democracy is the form of government in which you can choose your dictator
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