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|
/// This module is entirely adapted from the relevant code in Serenity.
use std::{
io::{
Read,
Result as IoResult,
},
process::{
Child,
Command,
Stdio,
},
};
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!("Error awaiting child process: {:?}", e);
}
}
}
pub(crate) trait CodecInfo {
fn ffmpeg_opts() -> &'static[&'static str];
}
pub(crate) struct Pcm {}
#[allow(dead_code)]
pub(crate) struct Opus {}
impl CodecInfo for Pcm {
#[inline]
fn ffmpeg_opts() -> &'static[&'static str] {
lazy_static! {
static ref OPTS: Vec<&'static str> = vec! [
"-f", "s16le",
"-acodec", "pcm_s16le",
];
}
&*OPTS
}
}
impl CodecInfo for Opus {
#[inline]
fn ffmpeg_opts() -> &'static[&'static str] {
lazy_static! {
static ref OPTS: Vec<&'static str> = vec! [
"-f", "opus",
"-acodec", "libopus",
"-b:a 96k",
];
}
&*OPTS
}
}
pub fn ytdl_url(uri: &str) -> Result<String> {
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()),
};
match obj.remove("url") {
Some(v) => match v {
Value::String(uri) => Ok(uri),
other => Err(VoiceError::YouTubeDLUrl(other).into()),
},
None => Err(VoiceError::YouTubeDLUrl(Value::Object(obj)).into()),
}
}
pub(crate) fn ffmpeg_dl<T: CodecInfo>(uri: &str, start: Option<Duration>, end: Option<Duration>, size_limit: Option<usize>) -> Result<Box<dyn Read + Send>> {
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! [
"-ac",
"2", // force stereo -- this may cause issues
"-ar",
"48000",
"-ss",
&start_str,
]
.into_iter()
.map(|s| s.to_owned())
.collect::<Vec<_>>();
if let Some(e) = end {
opts.push("-to".to_owned());
opts.push(format!("{:02}:{:02}:{:02}", e.num_hours(), e.num_minutes() % 60, e.num_seconds() % 60));
}
let codec_opts = T::ffmpeg_opts().into_iter().map(|&s| s.to_owned()).collect::<Vec<_>>();
opts.extend(codec_opts);
if let Some(limit) = size_limit {
opts.push("-fs".to_owned());
opts.push(format!("{}", limit));
}
opts.push("-".to_owned());
debug!("ffmpeg -i \"{}\" {}", uri, opts.join(" "));
let command = Command::new("ffmpeg")
.arg("-i")
.arg(uri)
.args(opts)
.stderr(Stdio::piped())
.stdin(Stdio::null())
.stdout(Stdio::piped())
.spawn()?;
Ok(Box::new(ChildContainer(command)))
}
pub fn ytdl(uri: &str, start: Option<Duration>, end: Option<Duration>) -> Result<Box<AudioSource>> {
let youtube_uri = ytdl_url(uri)?;
let command = ffmpeg_dl::<Pcm>(&youtube_uri, start, end, None)?;
Ok(pcm(true, command))
}
|
