BPM detection plugin

[Dafydd Crosby]

A wishlist item is to have a beat-per-minute detection plugin that could fill in the BPM tag of a track. Gstreamer has soundtouch in bad_plugins, which with bpmdetect should take care of business.

http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-bad-plugins/html/gst-plugins-bad-plugins-plugin-soundtouch.html

My knowledge with Gstreamer isn't so hot, but if someone could point me in the general direction I could probably whip it up myself.

[Dafydd Crosby (dcrosby)]

Here's a traceback from the newest version

Traceback (most recent call last):
  File "/home/dafydd/exaile/xl/event.py", line 300, in emit
    cb.function.__call__(event.type, event.object, event.data)
  File "/home/dafydd/exaile/data/plugins/bpmdetection/__init__.py", line 13, in on_play
    track_bpm = pipeline.get_property("detect")
TypeError: object of type `GstPipeline' does not have property `detect'
ERROR : Exception caught!
Traceback (most recent call last):
  File "/home/dafydd/exaile/xl/event.py", line 300, in emit
    cb.function.__call__(event.type, event.object, event.data)
  File "/home/dafydd/exaile/data/plugins/bpmdetection/__init__.py", line 13, in on_play
    track_bpm = pipeline.get_property("detect")
TypeError: object of type `GstPipeline' does not have property `detect'

[Dafydd Crosby (dcrosby)]

I've got a BPM detection patch that works to a certain extent. Instead of going through Python (which was not correctly linking decodebin and audioconvert), I simply had Python pipe the Bash command in, and then grab the first available BPM data. Of course, this leads to certain problems with songs with multiple tempos. However, we would have to sum all of the results, making the final BPM result disappointingly inaccurate.

I commented out the Python code so that if someone wants to fix that up (instead of using the Bash hack), they can go right on ahead.

[Dustin Spicuzza (dustin-virtualroadside)]

I've created a manual BPM counter plugin, see patch in bug 865087: https://bugs.launchpad.net/exaile/+bug/865087