71 lines
2.3 KiB
Rust
71 lines
2.3 KiB
Rust
#![cfg(target_os = "linux")]
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use anyhow::{Context, Result};
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use std::fs;
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use std::process::Command;
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const FIFO_PATH: &str = "/tmp/stereo_out.fifo";
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const REAL_ASOUND_CONF: &str = "/etc/asound.conf";
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const TEMP_ASOUND_CONF: &str = "/tmp/asound.stereo.conf";
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/// ALSA 音频重定向器，用于拦截系统音频输出到 FIFO 管道
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pub struct AlsaRedirector;
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impl AlsaRedirector {
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pub fn new() -> Result<Self> {
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Self::cleanup(); // 确保环境干净
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let original_conf = fs::read_to_string(REAL_ASOUND_CONF).unwrap_or_default();
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if !original_conf.contains("pcm.original_default") {
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// 重命名原有的 default 逻辑，插入拦截器
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let mut new_conf = original_conf.replace("pcm.!default", "pcm.original_default");
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new_conf.push_str(&format!(
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"\npcm.!default {{ type plug slave {{ pcm \"stereo_interceptor\" format S16_LE rate 48000 channels 2 }} }}\n\
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pcm.stereo_interceptor {{ type file slave.pcm \"null\" file \"{}\" format \"raw\" }}\n",
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FIFO_PATH
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));
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fs::write(TEMP_ASOUND_CONF, new_conf)?;
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// 挂载覆盖 /etc/asound.conf
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let status = Command::new("mount")
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.arg("--bind")
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.arg(TEMP_ASOUND_CONF)
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.arg(REAL_ASOUND_CONF)
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.status()
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.context("执行 mount 命令失败")?;
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if !status.success() {
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return Err(anyhow::anyhow!("挂载 asound.conf 失败"));
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}
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}
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// 创建 FIFO 管道
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let _ = Command::new("mkfifo").arg(FIFO_PATH).status();
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let _ = Command::new("chmod").arg("666").arg(FIFO_PATH).status();
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// println!("ALSA 输出已重定向至 {}", FIFO_PATH);
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Ok(Self)
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}
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pub fn cleanup() {
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let _ = Command::new("sh")
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.arg("-c")
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.arg(format!("umount -l {} >/dev/null 2>&1", REAL_ASOUND_CONF))
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.status();
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let _ = fs::remove_file(TEMP_ASOUND_CONF);
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let _ = fs::remove_file(FIFO_PATH);
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// println!("ALSA 配置已恢复。");
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}
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pub fn fifo_path() -> &'static str {
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FIFO_PATH
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}
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}
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impl Drop for AlsaRedirector {
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fn drop(&mut self) {
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Self::cleanup();
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}
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}
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