Jun 17, 2023, 20:37 by mich...@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 >
I like the new functionality, but I too think that libavformat should just source the data from a device, and that libavfilter should demodulate. There are applications for which you'd like to store the raw Mhz/Ghz audio data as well as the decoded data. Additionally, filters can receive commands, while demuxers can't, so switching stations would be simpler. _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
