rockbox/firmware/export/pcm_sw_volume.h, branch master My Rockbox tree Provide high resolution volume and prescaler to hosted targets. 2013-04-27T04:59:27+00:00 Michael Sevakis jethead71@rockbox.org 2013-04-23T07:20:49+00:00 08199cd6cb1e2c600eb16ce077cc308fee82de33 HAVE_SW_VOLUME_CONTROL is required and at this time only affects the SDL targets using pcm-sdl.c. Enables balance control in SDL targets, unless mono volume is in use. Compiles software volume control as unbuffered when PCM_SW_VOLUME_UNBUFFERED is defined. This avoids the overhead and extra latency introduced by the double buffer when it is not needed. Use this config when the target's PCM driver is buffered and sufficient latency exists to perform safely the volume scaling. Simulated targets that are double-buffered when made as native targets remain so in the sim in order to run the same code. Change-Id: Ifa77d2d3ae7376c65afecdfc785a084478cb5ffb Reviewed-on: http://gerrit.rockbox.org/457 Reviewed-by: Michael Sevakis <jethead71@rockbox.org> Tested-by: Michael Sevakis <jethead71@rockbox.org> 
HAVE_SW_VOLUME_CONTROL is required and at this time only affects the
SDL targets using pcm-sdl.c.

Enables balance control in SDL targets, unless mono volume is in use.

Compiles software volume control as unbuffered when
PCM_SW_VOLUME_UNBUFFERED is defined. This avoids the overhead and
extra latency introduced by the double buffer when it is not needed.
Use this config when the target's PCM driver is buffered and sufficient
latency exists to perform safely the volume scaling.

Simulated targets that are double-buffered when made as native targets
remain so in the sim in order to run the same code.

Change-Id: Ifa77d2d3ae7376c65afecdfc785a084478cb5ffb
Reviewed-on: http://gerrit.rockbox.org/457
Reviewed-by: Michael Sevakis <jethead71@rockbox.org>
Tested-by: Michael Sevakis <jethead71@rockbox.org>
Fix f5a5b94 errors. Employ SW volume for select targets on SIM. 2013-04-11T23:00:23+00:00 Michael Sevakis jethead71@rockbox.org 2013-04-11T22:57:06+00:00 2dd1f37a109792b262a4000c050f7a48a145f1c4 Onda VX747 sim was missing a limits #define; #include limits.h in pcm_sw_volume.h. Simply use the software volume control for the SIM volume control rather than the SDL volume control when the target would have it natively. Change-Id: I8e924a2ff1b410f602452d2ea9b691efb82c931e 
Onda VX747 sim was missing a limits #define; #include limits.h in
pcm_sw_volume.h.

Simply use the software volume control for the SIM volume control
rather than the SDL volume control when the target would have it
natively.

Change-Id: I8e924a2ff1b410f602452d2ea9b691efb82c931e
Implement universal in-PCM-driver software volume control. 2013-04-11T20:55:16+00:00 Michael Sevakis jethead71@rockbox.org 2013-04-05T08:36:05+00:00 f5a5b946867677de76c405ee72e2ea47e36e4c83 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> 
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>