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/// This module is entirely adapted from the relevant code in Serenity.
use std::{
io::{
Read,
Result as IoResult,
},
process::{
Command,
Stdio,
Child,
},
};
use chrono::Duration;
use serde_json::Value;
use serenity::{
voice::{
AudioSource,
pcm,
VoiceError,
}
};
use crate::Result;
struct ChildContainer(Child);
impl Read for ChildContainer {
fn read(&mut self, buffer: &mut [u8]) -> IoResult<usize> {
self.0.stdout.as_mut().unwrap().read(buffer)
}
}
impl Drop for ChildContainer {
fn drop (&mut self) {
if let Err(e) = self.0.kill() {
debug!("[Voice] Error awaiting child process: {:?}", e);
}
}
}
pub fn ytdl(uri: &str, start: Option<Duration>, end: Option<Duration>) -> Result<Box<AudioSource>> {
let args = [
"-f",
"webm[abr>0]/bestaudio/best",
"--no-playlist",
"--print-json",
"--skip-download",
uri,
];
let out = Command::new("youtube-dl")
.args(&args)
.stdin(Stdio::null())
.output()?;
if !out.status.success() {
return Err(VoiceError::YouTubeDLRun(out).into());
}
let value = serde_json::from_reader(&out.stdout[..])?;
let mut obj = match value {
Value::Object(obj) => obj,
other => return Err(VoiceError::YouTubeDLProcessing(other).into()),
};
let uri = match obj.remove("url") {
Some(v) => match v {
Value::String(uri) => uri,
other => return Err(VoiceError::YouTubeDLUrl(other).into()),
},
None => return Err(VoiceError::YouTubeDLUrl(Value::Object(obj)).into()),
};
let start = start.unwrap_or(Duration::zero());
let start_str = format!("{:02}:{:02}:{:02}", start.num_hours(), start.num_minutes() % 60, start.num_seconds() % 60);
let mut opts = vec! [
"-f",
"s16le",
"-ac",
"2", // force stereo -- this may cause issues
"-ar",
"48000",
"-acodec",
"pcm_s16le",
"-ss",
&start_str,
]
.into_iter()
.map(|s| s.to_owned())
.collect::<Vec<_>>();
match end {
Some(e) => {
opts.push("-to".to_owned());
opts.push(format!("{:02}:{:02}:{:02}", e.num_hours(), e.num_minutes() % 60, e.num_seconds() % 60));
},
_ => {},
}
opts.push("-".to_owned());
let command = Command::new("ffmpeg")
.arg("-i")
.arg(uri)
.args(opts)
.stderr(Stdio::null())
.stdin(Stdio::null())
.stdout(Stdio::piped())
.spawn()?;
Ok(pcm(true, ChildContainer(command)))
}
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