[Bug 751457] bpmdetect: it's just crazy

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=751457

--- Comment #7 from Dustin Spicuzza <dustin at virtualroadside.com> ---
Well, my point was that the problem wasn't libsoundtouch, but rather the way
that gst is using it. 

BUT. I found a legit bug.

There's something wonky about the way the plugin is mixing the channels when it
does the memcpy. If I use a capsfilter to mix it down to a single channel
before the bpmdetect plugin, then it returns results that match the output of
'soundstretch output.wav -bpm'.

I looked at it, and it seemed fine to me. Probably a padding problem or some
mismatch between the buffer gst is sending and what libsoundtouch is expecting.

The workaround is good enough for me (though it would be good to fix this!),
I've updated the gist with it.

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