6 copyright: Dan Dennedy, Marco Gittler, and Steve Harris
13 description: Compute the audio amplitude.
15 This filter provides the amplitude level as a percentage value in floating point.
16 This does not do any "slowing" of the data by averaging out peaks and
17 troughs of short duration like a VU meter.
18 Applications can also get this data on the frame as meta.media.audio_level.<N>
19 where <N> is the channel number starting with 0.
23 - identifier: iec_scale
24 title: Use IEC 60268-18 Scale
31 - identifier: _audio_level.<N>
33 <N> is the channel number starting with 0.
34 This is updated on every frame with audio.