From 74d7751c37d2c991d244c1c23e1a4cd24451ac41 Mon Sep 17 00:00:00 2001 From: David Robillard Date: Wed, 6 Aug 2014 01:26:06 +0000 Subject: Order book chapters in build script rather than by bundle name. --- plugins/eg-scope.lv2/README.txt | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) create mode 100644 plugins/eg-scope.lv2/README.txt (limited to 'plugins/eg-scope.lv2/README.txt') diff --git a/plugins/eg-scope.lv2/README.txt b/plugins/eg-scope.lv2/README.txt new file mode 100644 index 0000000..122794c --- /dev/null +++ b/plugins/eg-scope.lv2/README.txt @@ -0,0 +1,32 @@ +== Simple Oscilloscope == + +This plugin displays the waveform of an incoming audio signal using a simple +GTK+Cairo GUI. + +This plugin illustrates: + +- UI <==> Plugin communication via http://lv2plug.in/ns/ext/atom/[LV2 Atom] events +- Atom vector usage and resize-port extension +- Save/Restore UI state by communicating state to backend +- Saving simple key/value state via the http://lv2plug.in/ns/ext/state/[LV2 State] extension +- Cairo drawing and partial exposure + +This plugin intends to outline the basics for building visualization plugins +that rely on atom communication. The UI looks like an oscilloscope, but is not +a real oscilloscope implementation: + +- There is no display synchronisation, results will depend on LV2 host. +- It displays raw audio samples, which a proper scope must not do. +- The display itself just connects min/max line segments. +- No triggering or synchronization. +- No labels, no scale, no calibration, no markers, no numeric readout, etc. + +Addressing these issues is beyond the scope of this example. + +Please see http://lac.linuxaudio.org/2013/papers/36.pdf for scope design, +https://wiki.xiph.org/Videos/Digital_Show_and_Tell for background information, +and http://lists.lv2plug.in/pipermail/devel-lv2plug.in/2013-November/000545.html +for general LV2 related conceptual criticism regarding real-time visualizations. + +A proper oscilloscope based on this example can be found at +https://github.com/x42/sisco.lv2 -- cgit v1.2.1