Replace the factor calculation from pcm-alsa.c, which
is based on signal *power* ratios, with the fp_factor()
calculation that is based on amplitude ratios. Because
power changes with the square of amplitude, this means
1 dB of power equals 2 dB of amplitude.
Rockbox's volume controls are amplitude-based, so the
smallest step size for pcm-alsa was effectively 2 dB.
The fp_factor() method supports 0.1 dB steps and is a
bit more accurate besides, so it's simply superior in
all respects (aside from taking a few more CPU cycles
to calculate the factor).
Change-Id: I34d143c225d8b5e085cde299fc405f83c13314bf
They are nearly entirely generic wrappers around ALSA controls, unique
per target, and are ripe for further consolidation.
Change-Id: I05e4a450e3e89e03616906601c4f8fa46200dff5
2025-12-02 18:59:50 -05:00
Renamed from firmware/drivers/audio/erosqlinux_codec.c (Browse further)
