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rockbox/firmware
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Dana Conrad 7c4293af64 usbaudio: convert to asynchronous operation 
Add feedback not based on samples used, but on buffers filled - idea
being we can do "PID" (someone who has actually implemented Real PID
could probably rewrite the calculation) based on how many buffers
we have filled versus the ideal buffer filled level (16).

Feedback is based on a historical average of the last two feedback
intervals.

This feedback math is done as fixed-point math to keep floats out of core. Note that a couple division operations needed to be strategically staged to avoid overflow or truncation.

Floats are still used for debug screen printout.

Also fixed a typo in the definition of usb_audio_control_request()

Host:
Linux: works
MacOS: works
Windows: Feedback does not work! It appears that Windows may not
         support asynchronous devices at all. Playback may "work",
         but results will vary as the number of buffers filled will
         drift over time.

Change-Id: I027feb16705e6e46c1144b1d08920b53de42cb26
2025-11-15 07:32:05 -05:00
..
asm arm: add ARMv7-M version of ARMv6 mixer code 2025-04-18 10:57:45 -04:00
common disk: Minor cleanups with respect to virtual<->logical sector mapping 2025-09-22 22:12:59 -04:00
drivers Add USB Audio 1.0 support 2025-11-15 07:30:15 -05:00
export usbaudio: convert to asynchronous operation 2025-11-15 07:32:05 -05:00
include 3ds: 3ds port sources. First set of two 2025-10-23 20:09:09 -04:00
kernel 3ds: 3ds port sources. First set of two 2025-10-23 20:09:09 -04:00
libc isdigit replace with a slightly faster and shorter conditional 2025-02-02 13:57:58 -05:00
target Add USB Audio 1.0 support 2025-11-15 07:30:15 -05:00
usbstack usbaudio: convert to asynchronous operation 2025-11-15 07:32:05 -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 For backlights that have a wide control, support skipping steps. 2020-10-02 02:45:43 +00:00
backlight.c [Bugfix] call lcd_awake() unconditioanlly on shutdown for devices with HAVE_LCD_SLEEP 2025-01-05 10:59:46 -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 [1/4] Remove SH support and all archos targets 2020-07-24 21:20:13 +00:00
eeprom_settings.c
enc_base.c
events.c events.c clean-up 2022-12-30 07:23:29 -05:00
firmware.make build: Various LTO fixes 2024-11-24 08:43:23 -05:00
font.c unicode: Support characters beyond the first unicode plane 2025-09-12 09:24:30 -04:00
font_cache.c unicode: Support characters beyond the first unicode plane 2025-09-12 09:24:30 -04:00
general.c replace strlcpy with strmemccpy 2022-11-14 23:56:16 -05:00
hangul.c unicode: Support characters beyond the first unicode plane 2025-09-12 09:24:30 -04:00
linuxboot.c buflib_shrink use NULL to signal start isn't changing 2023-01-13 09:50:29 -05:00
load_code.c Fix various reds. Some includes needed fixup. 2014-03-03 19:10:48 +01:00
logf.c logf: Fix an incorrect fix in 835d0c737a 2021-08-15 09:03:16 -04:00
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 pcm_mixer: Fix an idle frame calculation bug introduced in 2e708c48c5 2020-10-24 02:00:50 +00:00
pcm_sampr.c pcm: Missed a file for the 192/176K playback. 2020-09-30 22:03:34 -04:00
pcm_sw_volume.c move PCM_NATIVE_BITDEPTH definiton into global config code 2021-08-07 11:18:19 -04:00
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 h300: add support for ROM image generation 2020-10-26 01:37:42 +00:00
screendump.c Fix path buffer overflow in screendump 2021-08-06 15:46:53 +00:00
scroll_engine.c misc: Ensure stacks are always aligned with the native pointer size. 2025-09-05 19:43:11 -04:00
sdmmc.c SD: Move sd_parse_csd() into common sdmmc code 2025-08-22 14:48:28 -04:00
sound.c sound: fix volume change being reported to %mv tag on boot 2025-10-03 10:01:02 +01:00
SOURCES Add USB Audio 1.0 support 2025-11-15 07:30:15 -05:00
storage.c ata: Rework how flushing, sleeping, and power off interacts 2024-10-31 12:51:54 -04:00
system.c Add ability to dump cpu boost log to disk, include thread names 2021-09-30 21:13:22 -04:00
timer.c Fix timer Agptek Rocker (other hosted players) 2019-10-17 21:19:00 +02:00
tuner.c [1/4] Remove SH support and all archos targets 2020-07-24 21:20:13 +00:00
usb.c Add USB Audio 1.0 support 2025-11-15 07:30:15 -05:00

README 

See docs/README