tinyusb.git/examples/host/audio_host/src/main.c, branch master

audio: service example FIFOs at watermarks

2026-08-27T08:36:52Z

Move capture and playback FIFO servicing into the main-loop task at half-full and half-drained watermarks. Use transfer callbacks only for diagnostics, share one conversion buffer, and demonstrate that application reads and writes need not be synchronized to USB callbacks. Signed-off-by: HiFiPHile

audio: add UAC2 host streaming support

2026-08-27T08:34:33Z

Add protocol-selectable UAC1/UAC2 parsing, UAC2 terminal and Feature Unit topology, Clock Source discovery, sampling-frequency ranges, and protocol-specific stream controls. Cover UAC2 playback, capture, control discovery, and malformed descriptors with unit tests. Signed-off-by: HiFiPHile

fix(audio): repair the host audio example build

2026-08-25T07:27:35Z

Add the missing preset and shared declarations, remove duplicate initialization, and correct callback call sites so the new example builds through the normal CMake flow. Signed-off-by: HiFiPHile

feat(class/audio): rework TUH_AUDIO into a WASAPI/ALSA-like stream API

2026-08-14T03:17:00Z

Provide a high-level audio streaming API over UAC 1.0 devices while keeping the USB topology private: applications select supported {format, sample_rate, channels} configurations per logical stream, and the driver owns the mapping to AS interface, alternate setting, and endpoint. - One logical stream per direction per instance; multiple AS interfaces and alternate settings in a direction are merged into the stream's configuration list (discrete tuples; continuous ranges exposed as a single configuration at the top rate) - Asynchronous tuh_audio_configure(): SET_INTERFACE to the selected alternate setting, open/reconfigure the endpoint, set the sampling frequency when supported, initialize the FIFO and packet scheduler, then invoke the completion callback - Frame-based FIFO streaming: tuh_audio_read()/tuh_audio_write() queue whole frames; the driver owns transfer replenishment and fractional packet scheduling (44.1 kHz pays back the 0.1 frame/ms remainder via an accumulator for exact average pacing) - tuh_audio_start()/tuh_audio_stop() activate/deactivate the stream interface through SET_INTERFACE (alt n / alt 0) Driver correctness fixes: - Parse only the AC header's interface collection; MIDI Streaming and other subclasses are skipped - Keep every discrete format as a separate configuration; endpoints are opened only for the alternate setting selected by tuh_audio_configure() - Check tuh_interface_set() return values and SET_INTERFACE transfer results instead of ignoring failures - Validate instance state, direction, buffers, and frame counts in every transfer API - Feature Unit requests use the control's real width (mute/AGC/loudness 1 byte, others 2 bytes) and convert multibyte values to host order - Failed/stalled/aborted isochronous transfers reach only the error callback, never the capture/playback callbacks The audio_host example uses the new API: 48 kHz stereo by default, automatic stream restart on error callbacks, a sine test tone on the playback stream, and periodic mic-only / spk-only / echo phase switching.

feat(audio): add USB Audio Host (UAC 1.0) support

2026-07-16T07:03:31Z

Add TinyUSB Host Audio class driver supporting UAC 1.0 devices. Features: - Support multiple Audio Streaming (AS) interfaces with independent format storage - Support both IN (Microphone) and OUT (Speaker) endpoints - Per-AS interface format info: channels, sample rate, bit resolution - Support Feature Unit volume control - Support sampling frequency get/set - Add host/audio_host example for STM32F407 discovery board - Support mono-to-stereo conversion for loopback Changes: - Add src/class/audio/audio_host.c and audio_host.h - Register AUDIO driver in usbh.c - Add CFG_TUH_AUDIO macro in tusb_option.h - Add host/audio_host example with CMake and Makefile build support Tested with Jabra USB headset (stereo speaker + mono microphone) on STM32F407 disco.