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Waveform plugin: NaN ValueError thrown repeatedly under some conditions #2195

declension opened this issue Jan 12, 2017 · 0 comments


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I got repeated (every second) exceptions (as below) being thrown and the dialog produced, but I can't reproduce now. It was after the Pulse sound source changed whilst QL was paused for a long time (BT headphones disconnected), not sure if that was the trigger.

Traceback (most recent call last):

  File "/home/nick/workspace/quodlibet/quodlibet/quodlibet/ext/events/", line 258, in do_draw
    self.draw_waveform(cr, width, height, elapsed_color, fg_color)

  File "/home/nick/workspace/quodlibet/quodlibet/quodlibet/ext/events/", line 221, in draw_waveform
    cr.line_to(x, ceil(half_height + val))

ValueError: cannot convert float NaN to integer
@declension declension self-assigned this Jan 12, 2017
lazka pushed a commit that referenced this issue Jan 22, 2017
 * If there are somehow no samples to draw, use single pixel height,
 rather than worry about NaNs etc.
 * Also do division only once.

 Fixes #2195
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