self.bw.write_u32le(0)?; // avg bytes per second
self.bw.write_u16le(ainfo.block_len as u16)?;
self.bw.write_u16le(ainfo.format.bits as u16)?;
self.bw.write_u32le(0)?; // avg bytes per second
self.bw.write_u16le(ainfo.block_len as u16)?;
self.bw.write_u16le(ainfo.format.bits as u16)?;