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

Michael Niedermayer michael at niedermayer.cc
Sat Jun 17 21:37:23 EEST 2023

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



Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Democracy is the form of government in which you can choose your dictator
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 195 bytes
Desc: not available
URL: <https://ffmpeg.org/pipermail/ffmpeg-devel/attachments/20230617/5d39bc85/attachment.sig>

More information about the ffmpeg-devel mailing list