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|
use std::mem;
use std::time::Duration;
use super::*;
use ::byteorder::{ByteOrder, NetworkEndian};
const OBLIGATE_POLYPHONE: u32 = 0xffffffff;
pub enum Command {
KeepAlive,
Ping{data: [u8; 32]},
Quit,
Play{sec: u32, usec: u32, freq: u32, amp: f32, voice: u32},
Caps{voices: u32, tp: [u8; 4], ident: [u8; 24]},
PCM{samples: [i16; 16]},
Unknown{data: [u8; Command::SIZE]},
}
impl Command {
const SIZE: usize = 36;
pub fn duration(&self) -> Option<Duration> {
match *self {
Command::Play{sec, usec, ..} => Some(Duration::new(sec as u64, usec * 1000)),
_ => None,
}
}
pub fn pitch(&self) -> Option<Pitch> {
match *self {
Command::Play{freq, ..} => Some(Pitch::Freq(freq as f32)),
_ => None,
}
}
}
impl<'a> From<&'a [u8; Command::SIZE]> for Command {
fn from(packet: &'a [u8; Command::SIZE]) -> Command {
let mut fields_u32: [u32; Command::SIZE / 4] = unsafe { mem::uninitialized() };
let mut fields_f32: [f32; Command::SIZE / 4] = unsafe { mem::uninitialized() };
NetworkEndian::read_u32_into(packet, &mut fields_u32);
unsafe { NetworkEndian::read_f32_into_unchecked(packet, &mut fields_f32); }
match fields_u32[0] {
0 => Command::KeepAlive,
1 => {
let mut data: [u8; 32] = unsafe { mem::uninitialized() };
data.copy_from_slice(&packet[4..]);
Command::Ping{data: data}
}
2 => Command::Quit,
3 => Command::Play{
sec: fields_u32[1],
usec: fields_u32[2],
freq: fields_u32[3],
amp: fields_f32[4],
voice: fields_u32[5],
},
4 => {
let mut tp: [u8; 4] = unsafe { mem::uninitialized() };
let mut ident: [u8; 24] = unsafe { mem::uninitialized() };
tp.copy_from_slice(&packet[8..12]);
ident.copy_from_slice(&packet[12..]);
Command::Caps{
voices: fields_u32[1],
tp: tp,
ident: ident,
}
},
5 => {
let mut samples: [i16; 16] = unsafe { mem::uninitialized() };
::byteorder::LittleEndian::read_i16_into(&packet[4..], &mut samples);
Command::PCM{samples: samples}
},
_ => {
let mut data: [u8; Command::SIZE] = unsafe { mem::uninitialized() };
data.copy_from_slice(packet);
Command::Unknown{data: data}
}
}
}
}
impl<'a> From<&'a Command> for [u8; Command::SIZE] {
fn from(cmd: &'a Command) -> [u8; Command::SIZE] {
let mut ret: [u8; Command::SIZE] = [0u8; Command::SIZE];
match *cmd {
Command::KeepAlive => NetworkEndian::write_u32(&mut ret[..4], 0),
Command::Ping{data} => {
NetworkEndian::write_u32(&mut ret[..4], 1);
(&mut ret[4..]).copy_from_slice(&data);
},
Command::Quit => NetworkEndian::write_u32(&mut ret[..4], 2),
Command::Play{sec, usec, freq, amp, voice} => {
NetworkEndian::write_u32_into(&[3u32, sec, usec, freq], &mut ret[..16]);
NetworkEndian::write_f32(&mut ret[16..20], amp);
NetworkEndian::write_u32(&mut ret[20..24], voice);
},
Command::Caps{voices, tp, ident} => {
NetworkEndian::write_u32_into(&[4u32, voices], &mut ret[..8]);
(&mut ret[8..12]).copy_from_slice(&tp);
(&mut ret[12..]).copy_from_slice(&ident);
},
Command::PCM{samples} => {
NetworkEndian::write_u32(&mut ret[..4], 5);
NetworkEndian::write_i16_into(&samples, &mut ret[4..]);
},
Command::Unknown{data} => {
ret.copy_from_slice(&data);
},
};
ret
}
}
|
