No fancy stuff: https://sourceforge.net/projects/audiogram-c/ Written in C, needs turbojpeg with the dev stuff and ffmpeg. I might try to figure out libmad and make it work with mp3 files, right now it does wav only. Looks like the VU meter part of Audacity with a cursor line moving across. On 9/25/20, Stuart Longland <stuartl@xxxxxxxxxxxxxxxxxx> wrote: > On 26/9/20 7:35 am, Alan Corey wrote: >> What I had in mind was to make Audacity have a hook to call an >> external program each time it updates the screen. Then call >> something like xwd from the hook and put the frames together later. >> No sound that way though, you'd have to mix in the audio file that >> Audacity is playing/displaying. xwd can do screen dumps of a specific >> window id, which Audacity would have access to since it owns it. > > Yeah, the best place to ask about that would be the Audacity lists > themselves. My understanding is that Audacity does not use ALSA > directly: it uses `portaudio` which can use ALSA as a back-end (among > others). So the audio interface is already abstracted. AFAIK > `portaudio` communicates with ALSA via a thread which would then be > communicating progress information back to the main thread running their > UI (`wxWidgets`-based). > > Doing a `fork()` then `exec()` could be quite expensive at the sort of > rates they may be repainting the screen at. This is quite a niché > application too… which is why "some assembly" may be required. > > The question then is, how often is this being done? > > If it's a once-off, use `ffmpeg` with carefully positioned windows and > be done with it. Otherwise, it might be worth exploring solutions like > `gstreamer`'s visualisation plug-ins to achieve what you're after. > > https://xkcd.com/1205/ > -- > Stuart Longland (aka Redhatter, VK4MSL) > > I haven't lost my mind... > ...it's backed up on a tape somewhere. > -- ------------- Education is contagious. _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
