//! Sounds file audio type.

use crate::{err::*, sound::Sound16};

/// Reads a sound.
pub fn read(b: &[u8]) -> ResultS<Sound16>
{
	read_data! {
		endian: BIG, buf: b, size: 21, start: 0, data {
			let len    = u32[4] usize;
			let rate   = u16[8];
			let lp_beg = u32[12] usize;
			let lp_end = u32[16] usize;
			let magic  = u8[20];
		}
	}

	match magic {
		0 => {
			let stream = &b[22..22 + len];
			Ok(Sound16::new_from_8(rate, lp_beg, lp_end, stream))
		}
		0xFF => {
			read_data! {
				endian: BIG, buf: b, size: 42, start: 22, data {
					let len = u32[0] usize;
					let bps = u16[26];
				}
			}

			match bps {
				16 => {
					let stream = &b[63..63 + len * 2];
					Ok(Sound16::new_from_16(rate, lp_beg, lp_end, stream))
				}
				8 => {
					let stream = &b[63..63 + len];
					Ok(Sound16::new_from_8(rate, lp_beg, lp_end, stream))
				}
				_ => bail!("bad bits per sample"),
			}
		}
		_ => bail!("invalid magic number"),
	}
}

// EOF