[FFmpeg-devel] avfilter/showvolume : add new options and minor clean

[Martin Vignali]

Hello,

Thanks for the comments.

New patchs in attach :

001 : Add display_scale volume
Change since prev patch :
- use enum for the value
- move the max_draw calc part to an inline func (avoid code duplication).

002 : Add Persistent max display
Change since prev patch
- Use only one param (dm_duration), if set to 0. (the default), disabled
display and calc
- move some part in inline func, to reduce code duplication
- offset line draw by 1 pixel (and use FFMAX to clip to 0). Fix display max
line, when max is 0db in horizontal mode
- add doc

Martin
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