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chore(stereo): 优化播放设备重初始化

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Del Wang
2026-01-01 20:27:42 +08:00
parent b69bd5a8f9
commit aa2a5d8474
3 changed files with 14 additions and 16 deletions
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examples/stereo/src/audio/player.rs
+9 -8
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@@ -52,18 +52,19 @@ fn setup_pcm(pcm: &PCM, sample_rate: u32, channels: u16) -> Result<()> {
hwp.set_rate(sample_rate, alsa::ValueOr::Nearest)?;
hwp.set_channels(channels as u32)?;
// // 设置较大的缓冲区以减少由于调度抖动导致的断音
// // 48000Hz * 0.2s = 9600 samples
// let buffer_size = (sample_rate as f64 * 0.2) as u32;
// let period_size = buffer_size / 4;
// hwp.set_buffer_size_near(buffer_size as alsa::pcm::Frames)?;
// hwp.set_period_size_near(period_size as alsa::pcm::Frames, alsa::ValueOr::Nearest)?;
// 设置较大的缓冲区以减少由于调度抖动和设备重初始化导致的断音/卡顿
// 使用 100ms 缓冲区，既能防止 underrun，又不会引入过大延迟
let buffer_size = (sample_rate as f64 * 0.1) as u32; // 100ms 缓冲
let period_size = buffer_size / 4; // 25ms 周期
hwp.set_buffer_size_near(buffer_size as alsa::pcm::Frames)?;
hwp.set_period_size_near(period_size as alsa::pcm::Frames, alsa::ValueOr::Nearest)?;
pcm.hw_params(&hwp).context("Failed to set HwParams")?;
let swp = pcm.sw_params_current()?;
// 设置 start_threshold 为 buffer_size 的一半，确保缓冲区有足够数据再开始播放
// swp.set_start_threshold(buffer_size as alsa::pcm::Frames / 2)?;
// 设置 start_threshold，当缓冲区有 1 个 period 数据时就开始播放
// 这样可以快速启动，同时保持足够的缓冲余量
swp.set_start_threshold(period_size as alsa::pcm::Frames)?;
pcm.sw_params(&swp)?;
pcm.prepare()?;
Ok(())