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feat: 完善 OTG UAC 音频支持

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mofeng-git
2026-07-26 11:59:58 +08:00
parent f86cba6ce5
commit 5963dfa01a
46 changed files with 2875 additions and 1867 deletions
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9
src/otg/uac.rs
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@@ -6,7 +6,7 @@ use super::configfs::{create_dir, create_symlink, remove_dir, write_file};
use super::function::GadgetFunction;
use crate::error::{AppError, Result};
/// USB Audio Class 2.0 (UAC1) gadget function.
/// USB Audio Class 1.0 gadget function.
///
/// Creates a virtual USB microphone that the USB host sees as a standard
/// USB audio input device. Audio written to the PCM playback device on the
@@ -60,13 +60,18 @@ impl GadgetFunction for UacFunction {
let chmask: u32 = (1u32 << self.channels) - 1;
write_file(&func_path.join("p_chmask"), &chmask.to_string())?;
write_file(&func_path.join("p_srate"), &self.sample_rate.to_string())?;
write_file(&func_path.join("p_ssize"), "2")?; // 16-bit S16LE
// 16-bit S16LE.
write_file(&func_path.join("p_ssize"), "2")?;
// One decibel per step. The kernel default is 1/256 dB, which creates
// 25,600 control values and triggers a UAC volume-range warning.
write_file(&func_path.join("p_volume_res"), "256")?;
// UAC1 does not need p_hs_bint — Windows has native built-in
// UAC1 drivers and handles isochronous streaming automatically.
// Only enable playback direction (gadget → host = mic).
// Disabling capture saves one isochronous endpoint.
write_file(&func_path.join("c_chmask"), "0")?;
write_file(&func_path.join("c_volume_present"), "0")?;
// req_number=4: explicitly allocate 4 USB requests for the
// isochronous endpoint. Default (0 = auto) may not be enough