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|
use std::{
collections::VecDeque,
io::{self, BufRead, BufReader, Cursor, Read},
process,
sync::{Arc, RwLock},
thread,
time::Duration,
};
use either::{Left, Right};
use log::{
debug,
error,
trace,
};
use serenity::{
CacheAndHttp,
client::bridge::voice::ClientVoiceManager,
prelude::*,
voice,
};
use typemap::Key;
use crate::{
audio::{
CurrentItem,
PlayArgs,
ytdl_url,
},
commands::{
sound_levels::DEFAULT_VOLUME,
},
Result,
CONFIG,
};
const SECONDS_LEAD_TIME: f32 = 0.75;
const SECONDS_TRAIL_TIME: f32 = 0.1;
const SAMPLE_RATE: usize = 48000;
const CHANNELS: usize = 2;
const BYTES_PER_SAMPLE: usize = 2;
const PRE_SILENCE_BYTES: usize = (SECONDS_LEAD_TIME * (SAMPLE_RATE * CHANNELS * BYTES_PER_SAMPLE) as f32) as usize;
const POST_SILENCE_BYTES: usize = (SECONDS_TRAIL_TIME * (SAMPLE_RATE * CHANNELS * BYTES_PER_SAMPLE) as f32) as usize;
#[derive(Clone)]
pub struct PlayQueue {
pub general_queue: VecDeque<PlayArgs>,
pub meme_queue: VecDeque<PlayArgs>,
pub playing: Option<CurrentItem>,
pub volume: f32,
}
impl Key for PlayQueue {
type Value = Arc<RwLock<PlayQueue>>;
}
impl PlayQueue {
pub fn new() -> Self {
PlayQueue {
general_queue: VecDeque::new(),
meme_queue: VecDeque::new(),
playing: None,
volume: DEFAULT_VOLUME,
}
}
pub fn register(c: &mut Client) {
let voice_manager = Arc::clone(&c.voice_manager);
let queue = Arc::new(RwLock::new(PlayQueue::new()));
{
let mut data = c.data.write();
data.insert::<PlayQueue>(Arc::clone(&queue));
}
let cache_http = c.cache_and_http.clone();
thread::spawn(move || {
loop {
if let Err(e) = Self::update(&cache_http, &queue, &voice_manager) {
error!("updating playqueue: {}", e);
}
thread::sleep(Duration::from_millis(250));
}
});
}
fn update(cache_http: &CacheAndHttp, queue_lck: &Arc<RwLock<Self>>, voice_manager: &Arc<Mutex<ClientVoiceManager>>) -> Result<()> {
let (queue_is_empty, queue_has_playing) = {
let queue = queue_lck.read().unwrap();
let allow_continue = queue.playing.clone().map_or(false, |x| !x.audio.lock().finished);
if allow_continue {
return Ok(());
}
(queue.general_queue.is_empty() && queue.meme_queue.is_empty(), queue.playing.is_some())
};
if queue_is_empty {
if queue_has_playing {
let mut queue = queue_lck.write().unwrap();
assert!({
let audio_lck = queue.playing.clone().unwrap().audio;
let audio = audio_lck.lock();
audio.finished
});
queue.playing = None;
let mut manager = voice_manager.lock();
manager.leave(CONFIG.discord.guild());
debug!("disconnected because playback finished");
}
return Ok(());
}
let mut queue = queue_lck.write().unwrap();
let mut item = if !queue.meme_queue.is_empty() {
queue.meme_queue.pop_front().unwrap()
} else {
queue.general_queue.pop_front().unwrap()
};
let src = match &mut item.data {
Left(ref url) => {
let youtube_url = ytdl_url(url.as_str())?;
let duration_opts = if let Some(e) = item.end {
vec! [
"-ss".to_owned(), item.start.map_or_else(
|| "00:00:00".to_owned(),
|s| format!("{:02}:{:02}:{:02}", s.num_hours(), s.num_minutes() % 60, s.num_seconds() % 60)
),
"-to".to_owned(), format!("{:02}:{:02}:{:02}", e.num_hours(), e.num_minutes() % 60, e.num_seconds() % 60),
]
} else {
vec! []
};
let ffmpeg_command = process::Command::new("ffmpeg")
.arg("-i")
.arg(youtube_url)
.args(duration_opts)
.args(&[
"-ac", "2",
"-ar", "48000",
"-f", "s16le",
"-acodec", "pcm_s16le",
"-",
])
.stdout(process::Stdio::piped())
.stderr(process::Stdio::null())
.stdin(process::Stdio::null())
.spawn()?;
let audio_reader = ffmpeg_command.stdout.unwrap();
let pre_silence = vec![0u8; PRE_SILENCE_BYTES];
let post_silence = vec![0u8; POST_SILENCE_BYTES];
let reader = Cursor::new(pre_silence).chain(audio_reader).chain(Cursor::new(post_silence));
voice::pcm(true, reader)
},
Right(ref vec) => {
let transcoder = process::Command::new("ffmpeg")
.args(&[
"-format", "opus",
"-i", "pipe:0",
"-acodec", "pcm_s16le",
"-f", "s16le",
"-"
])
.stdin(process::Stdio::piped())
.stdout(process::Stdio::piped())
.stderr(process::Stdio::piped())
.spawn()
.expect("unable to call ffmpeg");
let process::Child {
stdin,
stderr,
stdout,
..
} = transcoder;
thread::spawn(move || {
let stderr = BufReader::new(stderr.unwrap());
for line in stderr.lines() {
let line = line.unwrap();
trace!("{}", line);
}
});
let v = vec.clone();
thread::spawn(move || {
if let Err(e) = io::copy(&mut Cursor::new(v), &mut stdin.unwrap()) {
use std::io::ErrorKind;
if e.kind() == ErrorKind::BrokenPipe {
debug!("ffmpeg closed unexpectedly");
} else {
error!("copying audio to ffmpeg {}", e);
}
}
});
let pre_silence = vec![0u8; PRE_SILENCE_BYTES];
let post_silence = vec![0u8; POST_SILENCE_BYTES];
let reader = Cursor::new(pre_silence)
.chain(stdout.unwrap())
.chain(Cursor::new(post_silence));
voice::pcm(true, reader)
}
};
let mut manager = voice_manager.lock();
let handler = manager.join(CONFIG.discord.guild(), CONFIG.discord.voice_channel());
match handler {
Some(handler) => {
let audio = handler.play_only(src);
{
audio.lock().volume(queue.volume);
}
queue.playing = Some(CurrentItem {
init_args: item,
audio,
});
debug!("playing new song");
},
None => {
error!("couldn't join channel");
item.sender_channel.say(&cache_http.http, "something happened somewhere somehow.")?;
}
}
Ok(())
}
}
|
