Function parse_wav

native/shared/src/audio.rs:286–317

Parse a WAV file into SoundData.

(data: &[u8])

/// Parse a WAV file into SoundData.
pub fn parse_wav(data: &[u8]) -> Option<SoundData> {
    if data.len() < 44 { return None; }
    if &data[0..4] != b"RIFF" || &data[8..12] != b"WAVE" { return None; }

    let channels = u16::from_le_bytes([data[22], data[23]]);
    let sample_rate = u32::from_le_bytes([data[24], data[25], data[26], data[27]]);
    let bits_per_sample = u16::from_le_bytes([data[34], data[35]]);

    let mut offset = 36;
    while offset + 8 < data.len() {
        let chunk_id = &data[offset..offset + 4];
        let chunk_size = u32::from_le_bytes([
            data[offset + 4], data[offset + 5], data[offset + 6], data[offset + 7],
        ]) as usize;

        if chunk_id == b"data" {
            let pcm_data = &data[offset + 8..std::cmp::min(offset + 8 + chunk_size, data.len())];
            let samples = match bits_per_sample {
                16 => pcm_data.chunks_exact(2)
                    .map(|chunk| i16::from_le_bytes([chunk[0], chunk[1]]) as f32 / 32768.0)
                    .collect(),
                8 => pcm_data.iter()
                    .map(|&b| (b as f32 - 128.0) / 128.0)
                    .collect(),
                _ => return None,
            };
            return Some(SoundData { samples, sample_rate, channels });
        }
        offset += 8 + chunk_size;
    }
    None
}

/// Parse an MP3 file into SoundData.
#[cfg(feature = "mp3")]