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Aidan MacDonald 5b27e2255a Add perceptual volume adjustment 
The perceived loudness change of a change in volume depends
on the listening volume: at high volumes a 1 dB increment is
noticeable, but at low volumes a larger increment is needed
to get a comparable change in loudness.

Perceptual volume adjustment accounts for this fact, and
divides the hardware volume range into a number of steps.
Each step changes the dB volume by a variable amount, with
most of the steps concentrated at higher volumes. This
makes it possible to sweep over the entire hardware volume
range quickly, without losing the ability to finely adjust
the volume at normal listening levels.

Use "Volume Adjustment Mode" in the system settings menu
to select perceptual volume mode. The number of steps used
is controlled by "Number of Volume Steps". (Number of steps
has no effect in direct adjustment mode.)

It's still possible to set a specific dB volume level from
the sound settings menu when perceptual volume is enabled,
and perceptual volume does not affect the volume displayed
by themes.

Change-Id: I6f91fd3f7c5e2d323a914e47b5653033e92b4b3b
2023-01-22 21:19:57 +00:00
..
bitmaps Rename symbols of FiiO M3K Linux-based port 2021-02-27 23:53:28 +00:00
gui Add perceptual volume adjustment 2023-01-22 21:19:57 +00:00
hosted/android replace strlcpy with strmemccpy 2022-11-14 23:56:16 -05:00
iap Remove buflib allocation names, part two 2023-01-13 10:32:54 +00:00
keymaps [Feature] xduoo X3 add pitchscreen hotkey to wps 2023-01-13 23:56:10 -05:00
lang Add perceptual volume adjustment 2023-01-22 21:19:57 +00:00
menus Add perceptual volume adjustment 2023-01-22 21:19:57 +00:00
plugins Add perceptual volume adjustment 2023-01-22 21:19:57 +00:00
radio Remove buflib allocation names, part two 2023-01-13 10:32:54 +00:00
recorder Database: Add ability to insert multiple files into playlists 2023-01-14 12:14:28 -05:00
abrepeat.c [3/4] Completely remove HWCODEC support 2020-07-24 21:20:13 +00:00
abrepeat.h abrepeat add dummy functions and remove some of the ifdefs 2022-12-14 23:37:14 -05:00
action.c Remove buflib allocation names, part two 2023-01-13 10:32:54 +00:00
action.h [Feature/Bugfix] keyremap add Context flags 2022-12-31 16:12:18 -05:00
alarm_menu.c alarm_menu share setter with settime 2022-03-30 09:05:28 -04:00
alarm_menu.h Fix menu warnings 2018-10-18 00:06:31 +02:00
appevents.h Get voice event out of playback.c 2017-12-12 20:28:56 -05:00
applimits.h
apps.make
audio_path.c nwza860: fix simulator build 2020-10-19 03:39:33 +00:00
audio_thread.c Get voice event out of playback.c 2017-12-12 20:28:56 -05:00
audio_thread.h
beep.c
bookmark.c wps.c cleanup gui_show_wps 2022-12-14 22:35:33 -05:00
bookmark.h Fix return to root after selecting items from playlist viewer 2022-11-19 10:01:23 +01:00
buffering.c [BugFix] Buffering.c NULL src for memcpy is UB -- ASAN 2023-01-04 20:20:08 -05:00
buffering.h buffering: remove bufgettail/bufcuttail 2022-04-20 16:51:49 -04:00
codec_thread.c codec_thread.c don't overrun audio_formats[] array 2021-08-11 10:56:14 -04:00
codec_thread.h
codecs.c [3/4] Completely remove HWCODEC support 2020-07-24 21:20:13 +00:00
core_asmdefs.c
core_keymap.c Add core_get_data_pinned(), use it where possible 2023-01-15 08:57:45 -05:00
core_keymap.h key remap: simplify and use movable allocations 2022-09-25 11:05:59 +01:00
cuesheet.c cuesheet.c guard against invalid digits causing underflow on field ASAN 2022-11-21 23:24:30 -05:00
cuesheet.h [4/4] Remove HAVE_LCD_BITMAP, as it's now the only choice. 2020-07-24 21:20:13 +00:00
debug_menu.c [Feature] Add total entries to database info 2023-01-15 22:57:00 -05:00
debug_menu.h Fix menu warnings 2018-10-18 00:06:31 +02:00
enc_config.c menus remove reserved 'param' parameter 2022-12-17 04:24:37 -05:00
enc_config.h Fix menu warnings 2018-10-18 00:06:31 +02:00
features.txt Add perceptual volume adjustment 2023-01-22 21:19:57 +00:00
filetree.c [Feature] filetree fallback to loading a playlist from disk 2023-01-08 09:52:23 -05:00
filetree.h Don't autoload bookmarks after saving dynamic playlist 2022-10-18 07:23:25 -04:00
filetypes.c buflib_shrink use NULL to signal start isn't changing 2023-01-13 09:50:29 -05:00
filetypes.h [Bug Fix] filetypes.c move voice data out of INIT_ATTR 2022-12-13 22:35:24 -05:00
fracmul.h Build librbcodec with DSP and metadata. 2012-03-18 12:00:39 +01:00
keyboard.h [4/4] Remove HAVE_LCD_BITMAP, as it's now the only choice. 2020-07-24 21:20:13 +00:00
language.c language.c fix possible buffer overrun 2021-08-03 00:57:35 +00:00
language.h
logfdisp.c misc.c open_pathfmt caller supplied buffer 2022-11-23 22:09:46 -05:00
logfdisp.h
main.c remove rockboxlogo after boot INIT_ATTR 2022-12-19 18:59:59 -05:00
menu.c settings: Remove setting ID return from find_setting() 2022-12-17 13:36:38 +00:00
menu.h menus remove reserved 'param' parameter 2022-12-17 04:24:37 -05:00
misc.c Add perceptual volume adjustment 2023-01-22 21:19:57 +00:00
misc.h Add perceptual volume adjustment 2023-01-22 21:19:57 +00:00
onplay.c database: make parent tables work with plugin 2023-01-19 15:56:35 -05:00
onplay.h Database: Add ability to insert multiple files into playlists 2023-01-14 12:14:28 -05:00
open_plugin.c Remove browse_context_init() 2022-12-17 13:36:38 +00:00
open_plugin.h open_plugin.c access open_plugin_entry through a function 2022-12-16 09:05:06 -05:00
pcmbuf.c Additional Single Mode options 2021-12-11 11:43:39 -05:00
pcmbuf.h Fix a problem with audio not starting on a list of short files 2017-04-06 19:32:35 -04:00
playback.c Remove buflib allocation names, part two 2023-01-13 10:32:54 +00:00
playback.h Option to switch off album art or to prefer file over embedded 2022-01-22 08:29:40 -05:00
playlist.c playlist: pin dircache fileref buffer during background scanning 2023-01-22 13:47:50 +00:00
playlist.h playlist: pin dircache fileref buffer during background scanning 2023-01-22 13:47:50 +00:00
playlist_catalog.c Database: Add ability to insert multiple files into playlists 2023-01-14 12:14:28 -05:00
playlist_catalog.h Database: Add ability to insert multiple files into playlists 2023-01-14 12:14:28 -05:00
playlist_menu.h Updated our source code header to explicitly mention that we are GPL v2 or 2008-06-28 18:10:04 +00:00
playlist_viewer.c Database: Add ability to insert multiple files into playlists 2023-01-14 12:14:28 -05:00
playlist_viewer.h Playlist Catalogue: Restore selection in playlist 2022-11-26 17:20:06 +01:00
plugin.c Add perceptual volume adjustment 2023-01-22 21:19:57 +00:00
plugin.h Add perceptual volume adjustment 2023-01-22 21:19:57 +00:00
rbcodec_helpers.c Remove buflib allocation names, part two 2023-01-13 10:32:54 +00:00
rbcodecconfig.h
rbcodecplatform.h
README
root_menu.c Remove browse_context_init() 2022-12-17 13:36:38 +00:00
root_menu.h Add open_plugin to core 2020-08-17 10:15:14 -04:00
screen_access.c make splash split on control characters 2022-11-12 06:22:16 -05:00
screen_access.h make splash split on control characters 2022-11-12 06:22:16 -05:00
screens.c PictureFlow: Add 'Track Info' for tracks or whole albums 2023-01-10 18:50:12 +01:00
screens.h plugins: Properties: Add 'Last Modified' for audio files 2023-01-06 19:00:24 +01:00
settings.c settings: Remove setting ID return from find_setting() 2022-12-17 13:36:38 +00:00
settings.h Add perceptual volume adjustment 2023-01-22 21:19:57 +00:00
settings_list.c Add perceptual volume adjustment 2023-01-22 21:19:57 +00:00
settings_list.h settings: Update doc comment for struct settings_list::cfg_vals 2022-12-01 14:24:51 -05:00
shortcuts.c Remove buflib allocation names, part two 2023-01-13 10:32:54 +00:00
shortcuts.h
sound_menu.h Fix menu warnings 2018-10-18 00:06:31 +02:00
SOURCES LastFm remove scrobbler from core make a TSR plugin WIP 2022-03-26 02:50:11 -04:00
status.c [2/4] get rid of HAVE_LCD_CHARCELLS 2020-07-24 21:20:13 +00:00
status.h Add a comment about the ordering of 'enum playmode' 2022-11-23 10:08:49 -05:00
tagcache.c [Feature] Add total entries to database info 2023-01-15 22:57:00 -05:00
tagcache.h [Feature] Add total entries to database info 2023-01-15 22:57:00 -05:00
tagnavi.config tagtree: Support user override config file 2021-12-24 10:41:27 -05:00
tagtree.c database: make parent tables work with plugin 2023-01-19 15:56:35 -05:00
tagtree.h database: make parent tables work with plugin 2023-01-19 15:56:35 -05:00
talk.c Remove buflib allocation names, part two 2023-01-13 10:32:54 +00:00
talk.h talk.c clean up 2022-11-19 02:12:09 -05:00
tree.c Database: Add ability to insert multiple files into playlists 2023-01-14 12:14:28 -05:00
tree.h Remove browse_context_init() 2022-12-17 13:36:38 +00:00
usb_keymaps.c Document intentional fallthroughs + fix harmless unintended ones 2021-08-04 18:59:46 +00:00
usb_keymaps.h
voice_thread.c Remove buflib allocation names, part two 2023-01-13 10:32:54 +00:00
voice_thread.h voice: Allow voice prompt volume to be configurable 2021-03-07 12:51:36 +00:00

README 

For general information see: docs/README
For API information see: docs/API