fix: resample pcm stream chunks for livekit

cai

2026-07-06 e83f248c676f1ed56e5c42d16da9fba395285fe3

 src/main.rs

@@ -1465,39 +1465,13 @@
    sample_rate: u32,
    channels: u32,
) -> Result<Vec<PcmFrame>> {
    if sample_rate != TARGET_SAMPLE_RATE_HZ || channels != u32::from(TARGET_NUM_CHANNELS) {
        return Err(anyhow!(
            "unsupported pcm_s16le stream format: sample_rate={}, channels={}",
            sample_rate,
            channels
        ));
    }
    if payload.len() % 2 != 0 {
        return Err(anyhow!("pcm_s16le payload has odd byte length"));
    }
    let samples: Vec<i16> = payload
        .chunks_exact(2)
        .map(|chunk| i16::from_le_bytes([chunk[0], chunk[1]]))
        .collect();
    if samples.is_empty() {
        return Ok(Vec::new());
    }
    let samples_per_channel = (sample_rate / 50).max(1);
    let frame_sample_count = samples_per_channel as usize * channels as usize;
    let mut frames = Vec::new();
    for chunk in samples.chunks(frame_sample_count) {
        let chunk_samples_per_channel = (chunk.len() / channels as usize) as u32;
        if chunk_samples_per_channel == 0 {
            continue;
        }
        frames.push(PcmFrame::new(
            chunk.to_vec(),
    audio::pcm_s16le_bytes_to_frames(
        payload,
            sample_rate,
            channels,
            chunk_samples_per_channel,
        ));
    }
    Ok(frames)
        TARGET_SAMPLE_RATE_HZ,
        TARGET_NUM_CHANNELS,
    )
}

fn trim_ascii_whitespace(value: &[u8]) -> &[u8] {