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Aidan MacDonald 5b5cd252d0 pcm: improve 32-bit software volume scaling 
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
2026-02-23 15:44:42 +00:00
..
asm Remove Creative Zen Vision and Vision:M ports 2026-02-06 07:31:54 -05:00
common firmware: fat: fix sector_t passed to 64-bit format strings 2025-12-24 09:30:47 -05:00
drivers Remove Creative Zen Vision and Vision:M ports 2026-02-06 07:31:54 -05:00
export vx767: Bring config in line with its siblings 2026-02-23 08:32:44 -05:00
include elf_loader: add elf_loadmem() to load file from memory 2026-01-25 19:51:07 -05:00
kernel Convert users of SHAREDDATA_ATTR to SHAREDBSS_ATTR 2026-02-05 07:57:07 -05:00
libc lua -- remove strtol and strtoul replace with rb->strtol and rb->strtoul 2025-12-06 18:11:13 -05:00
reggen stm32h743: implement I2C controller interface 2026-02-23 08:19:29 -05:00
target pcm: improve 32-bit software volume scaling 2026-02-23 15:44:42 +00:00
usbstack usb: fix yellow in eb69211791 2026-01-27 15:23:47 -05:00
arabjoin.c
arabjoin.h unicode: Support characters beyond the first unicode plane 2025-09-12 09:24:30 -04:00
ata_idle_notify.c misc: Clean up a large pile of -Wexpansion-to-defined warnings 2025-04-21 21:04:05 -04:00
backlight-sw-fading.c backlight-sw-fading: FS#13717 fix brightness overshoot 2025-12-19 08:20:07 +01:00
backlight.c Convert users of SHAREDDATA_ATTR to SHAREDBSS_ATTR 2026-02-05 07:57:07 -05:00
bidi.c unicode: Support characters beyond the first unicode plane 2025-09-12 09:24:30 -04:00
buflib_malloc.c buflib_malloc: fixed signed/unsigned comparison 2023-01-16 16:57:23 +00:00
buflib_mempool.c buflib: Add pinned get/put data functions 2023-01-15 11:06:27 +00:00
chunk_alloc.c [BugFix] chunk_alloc pass NULL to buflib_shrink 2023-03-09 20:15:38 -05:00
COPYING
core_alloc.c hosted: Shrink audiobuffer to (MEMORY_SIZE-1) megabytes 2025-09-12 23:15:11 -04:00
debug.c
eeprom_settings.c
elf_loader.c elf_loader: add elf_loadmem() to load file from memory 2026-01-25 19:51:07 -05:00
enc_base.c
events.c
firmware.make make: remove asm.make and use asm/SOURCES directly 2026-01-08 16:41:57 +00:00
font.c font: logf: fix pointer in buflibmove_callback 2026-01-10 07:11:51 +01:00
font_cache.c unicode: Support characters beyond the first unicode plane 2025-09-12 09:24:30 -04:00
general.c
hangul.c unicode: Support characters beyond the first unicode plane 2025-09-12 09:24:30 -04:00
lc-rock.c firmware: introduce CONFIG_BINFMT 2026-01-05 13:14:30 -05:00
linuxboot.c buflib_shrink use NULL to signal start isn't changing 2023-01-13 09:50:29 -05:00
logf.c
lru.c
panic.c arm: add initial ARM Cortex-M support 2025-04-18 13:19:42 -04:00
pcm.c Rework auto playback frequency switch 2023-10-28 15:11:07 -04:00
pcm_mixer.c plugins: Convert all plugins to using mixer API for playback 2026-02-22 08:15:14 -05:00
pcm_sampr.c
pcm_sw_volume.c pcm: improve 32-bit software volume scaling 2026-02-23 15:44:42 +00:00
powermgmt.c misc: Ensure stacks are always aligned with the native pointer size. 2025-09-05 19:43:11 -04:00
profile.c
README
rolo.c nwze370: improve lcd & backlight 2025-10-21 16:54:57 -04:00
rom.lds
screendump.c
scroll_engine.c pass event data to usb_acknowledge 2026-01-26 19:47:09 -05:00
sdmmc.c SD: Move sd_parse_csd() into common sdmmc code 2025-08-22 14:48:28 -04:00
sound.c audio: remove pcm_sw_volume include from sound.c 2026-02-19 14:16:26 -05:00
SOURCES echoplayer: initialize I2C bus 2026-02-23 08:19:35 -05:00
storage.c bootloaders: Don't build usb_core without HAVE_BOOTLOADER_USB_MODE 2026-02-07 08:46:10 -05:00
system.c
timer.c
tuner.c
usb.c bootloaders: Don't build usb_core without HAVE_BOOTLOADER_USB_MODE 2026-02-07 08:46:10 -05:00

README 

See docs/README