diff options
| author | Michael Sevakis <jethead71@rockbox.org> | 2013-04-05 04:36:05 -0400 |
|---|---|---|
| committer | Michael Sevakis <jethead71@rockbox.org> | 2013-04-11 22:55:16 +0200 |
| commit | f5a5b946867677de76c405ee72e2ea47e36e4c83 (patch) | |
| tree | 8fb97a35059a16681b726973b4a5e13d41f96a35 /firmware/export/config/ondavx777.h | |
| parent | a9049a79d706dba61837ad02c7d7e3475cb6c193 (diff) | |
Implement universal in-PCM-driver software volume control.
Implements double-buffered volume, balance and prescaling control in
the main PCM driver when HAVE_SW_VOLUME_CONTROL is defined ensuring
that all PCM is volume controlled and level changes are low in latency.
Supports -73 to +6 dB using a 15-bit factor so that no large-integer
math is needed.
Low-level hardware drivers do not have to implement it themselves but
parameters can be changed (currently defined in pcm-internal.h) to work
best with a particular SoC or to provide different volume ranges.
Volume and prescale calls should be made in the codec driver. It should
appear as a normal hardware interface. PCM volume calls expect .1 dB
units.
Change-Id: Idf6316a64ef4fb8abcede10707e1e6c6d01d57db
Reviewed-on: http://gerrit.rockbox.org/423
Reviewed-by: Michael Sevakis <jethead71@rockbox.org>
Tested-by: Michael Sevakis <jethead71@rockbox.org>
Diffstat (limited to 'firmware/export/config/ondavx777.h')
| -rw-r--r-- | firmware/export/config/ondavx777.h | 5 |
1 files changed, 0 insertions, 5 deletions
diff --git a/firmware/export/config/ondavx777.h b/firmware/export/config/ondavx777.h index 33bf6442af..a254b0177c 100644 --- a/firmware/export/config/ondavx777.h +++ b/firmware/export/config/ondavx777.h @@ -126,11 +126,6 @@ /* has no volume control, so we use the software ones */ #define HAVE_SW_VOLUME_CONTROL -/* software controlled volume ranges from -73 -> 0 dB, other than that - is controlled by hardware */ -#define SW_VOLUME_MIN -73 -#define SW_VOLUME_MAX 0 - /* define the bitmask of hardware sample rates */ #define HW_SAMPR_CAPS (SAMPR_CAP_48 | SAMPR_CAP_44 | SAMPR_CAP_32 | \ SAMPR_CAP_24 | SAMPR_CAP_22 | SAMPR_CAP_16 | \ |