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|
use std::io;
use std::net::{SocketAddr, UdpSocket};
use crate::proto::Command;
use crate::synth::{Environment, GenBox, Parameters, SampleBuffer};
pub struct Voice {
pub gen: GenBox,
pub params: Parameters,
}
pub struct Client {
pub socket: UdpSocket,
pub voices: Vec<Voice>,
pub env: Environment,
pub frames: usize,
pub buf: SampleBuffer,
norm: SampleBuffer,
}
macro_rules! dprintln {
( $( $x:expr ),* ) => { eprintln!( $( $x ),* ) }
}
impl Client {
pub fn new(socket: UdpSocket, gens: Vec<GenBox>, env: Environment) -> io::Result<Client> {
let buf = SampleBuffer::new(env.default_buffer_size);
let voices = gens
.into_iter()
.map(|g| Voice {
gen: g,
params: Parameters {
env: env.clone(),
..Default::default()
},
})
.collect();
Ok(Client {
socket: socket,
voices: voices,
env: env,
frames: 0,
buf: buf,
norm: SampleBuffer::new(1),
})
}
// NB: Loops indefinitely (until timeout, quit, or error) iff self.socket blocks
/*
pub fn process_packets(&mut self) -> bool {
if self.voices.len() == 0 {
return false;
}
let mut buffer: [u8; Command::SIZE] = unsafe { mem::uninitialized() };
loop {
match self.socket.recv_from(&mut buffer) {
Ok((bytes, sender)) => {
if bytes != Command::SIZE {
dprintln!("Dropping packet: wrong number of bytes (got {}, expected {})", bytes, Command::SIZE);
continue;
}
let cmd = Command::from(&buffer);
if !self.handle_command(cmd, sender) {
return false;
}
},
Err(err) => {
if err.kind() == io::ErrorKind::WouldBlock {
break;
}
return false;
},
}
}
true
}
*/
pub fn handle_command(&mut self, cmd: Command, sender: SocketAddr) -> bool {
dprintln!("Packet {:?} from {:?}", cmd, sender);
match cmd {
Command::KeepAlive => {}
Command::Ping { .. } => {
let mut reply_buffer: [u8; Command::SIZE] = [0u8; Command::SIZE];
cmd.write_into(&mut reply_buffer);
self.socket.send_to(&reply_buffer, sender);
}
Command::Quit => {
return false;
}
Command::Play {
voice, freq, amp, ..
} => {
if (voice as usize) >= self.voices.len() {
dprintln!(
"Dropping packet: tried to send to voice {} >= number of voices {}",
voice,
self.voices.len()
);
return true;
}
let dur = cmd.duration().unwrap();
let frac_secs = (dur.as_secs() as f32) + (dur.subsec_nanos() as f32) / 1.0e9;
let frames = frac_secs * (self.env.sample_rate as f32);
dprintln!(
"Playing on voice {} freq {} amp {} from frame {} until frame {}",
voice,
freq,
amp,
self.frames,
(self.frames as f32) + frames
);
let vars = &mut self.voices[voice as usize].params.vars;
*vars
.entry("v_start".to_string())
.or_insert_with(Default::default) = self.frames as f32;
*vars
.entry("v_deadline".to_string())
.or_insert_with(Default::default) = self.frames as f32 + frames;
*vars
.entry("v_freq".to_string())
.or_insert_with(Default::default) = freq as f32;
*vars
.entry("v_amp".to_string())
.or_insert_with(Default::default) = amp;
}
Command::Caps { .. } => {
let reply = Command::Caps {
voices: self.voices.len() as u32,
tp: ['S' as u8, 'Y' as u8, 'N' as u8, 'F' as u8],
ident: [0u8; 24],
};
let mut reply_buffer: [u8; Command::SIZE] = [0u8; Command::SIZE];
reply.write_into(&mut reply_buffer);
self.socket.send_to(&reply_buffer, sender);
},
Command::PCM{..} => { /* TODO */ },
Command::PCMSyn{..} => { /* TODO */},
Command::ArtParam{voice, index, value} => {
dprintln!("Articulation parameter voice {:?} index {} value {}", voice, index, value);
for vidx in match voice {
Some(vidx) => ((vidx as usize)..((vidx+1) as usize)),
None => (0..self.voices.len()),
} {
*self.voices[vidx].params.vars.entry(format!("artp{}", index)).or_insert_with(Default::default) = value;
}
},
Command::Unknown{data} => {
dprintln!("Dropping packet: unknown data {:?}", (&data as &[u8]));
}
}
true
}
pub fn next_frames(&mut self) {
let len = self.voices.len();
for voice in self.voices.iter_mut() {
*voice
.params
.vars
.entry("v_frame".to_string())
.or_insert_with(Default::default) = self.frames as f32;
}
let (first, next) = self.voices.split_at_mut(1);
self.buf.update_from(first[0].gen.eval(&first[0].params));
for voice in next {
self.buf.sum_into(voice.gen.eval(&voice.params));
}
self.norm.set(1.0 / (len as f32));
self.buf.mul_into(&self.norm);
self.frames += self.buf.len();
}
pub fn buffer(&self) -> &SampleBuffer {
&self.buf
}
pub fn write_frames_bytes(&self, out_buffer: &mut Vec<u8>) {
let current = out_buffer.len();
out_buffer.reserve_exact(self.buf.size() - current);
unsafe {
out_buffer.set_len(self.buf.size());
}
self.buf.write_bytes(out_buffer);
}
}
|
