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Subject: Rockbox software volume control

Rockbox software volume control

From: Maurus Cuelenaere <>
Date: Tue, 26 Jan 2010 00:05:23 +0100


I currently don't have a lot of Rockbox time (exams), but decreasing the
delay when changing volume on the Onda VX747/VX777 has been a much asked
feature (+ I'm personally annoyed by it).

The Ingenic Jz4740 doesn't have hardware volume control in the audio
chip, hence the need for a software-based one. I have currently
implemented this by adding another parameter in the DSP (grep
HAVE_SW_VOLUME_CONTROL apps/dsp.c), but this results in a (pretty long)
delay when changing volume.

AFAICS this can be resolved by decreasing the DSP buffer size, but I'm
guessing that isn't a proper solution. Perhaps this can be solved in an
other way that I missed, any ideas?

Maurus Cuelenaere
Received on 2010-01-26

Page was last modified "Jan 10 2012" The Rockbox Crew