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/*
This file is part of jellything (https://codeberg.org/metamuffin/jellything)
which is licensed under the GNU Affero General Public License (version 3); see /COPYING.
Copyright (C) 2024 metamuffin <metamuffin.org>
*/
use crate::LOCAL_VIDEO_TRANSCODING_TASKS;
use jellybase::cache::{async_cache_file, CachePath};
use jellycommon::jhls::EncodingProfile;
use log::{debug, info};
use std::process::Stdio;
use tokio::{
io::copy,
process::{ChildStdin, Command},
};
// TODO odd video resolutions can cause errors when transcoding to YUV42{0,2}
// TODO with an implementation that cant handle it (SVT-AV1 such an impl).
pub async fn transcode(
key: &str,
enc: &EncodingProfile,
input: impl FnOnce(ChildStdin),
) -> anyhow::Result<CachePath> {
Ok(async_cache_file(
&["snip-tc", key, &format!("{enc:?}")],
move |mut output| async move {
let _permit = LOCAL_VIDEO_TRANSCODING_TASKS.acquire().await?;
debug!("transcoding snippet with {enc:?}");
let mut args = Vec::new();
match enc {
EncodingProfile::Video {
codec,
preset,
bitrate,
width,
} => {
if let Some(width) = width {
args.push("-vf".to_string());
args.push(format!("scale={width}:-1"));
}
args.push("-c:v".to_string());
args.push(codec.to_string());
if let Some(preset) = preset {
args.push("-preset".to_string());
args.push(format!("{preset}"));
}
args.push("-b:v".to_string());
args.push(format!("{bitrate}"));
}
EncodingProfile::Audio {
codec,
bitrate,
sample_rate,
channels,
} => {
if let Some(channels) = channels {
args.push("-ac".to_string());
args.push(format!("{channels}"))
}
if let Some(sample_rate) = sample_rate {
args.push("-ar".to_string());
args.push(format!("{sample_rate}"))
}
args.push("-c:a".to_string());
args.push(codec.to_string());
args.push("-b:a".to_string());
args.push(format!("{bitrate}"));
}
EncodingProfile::Subtitles { codec } => {
args.push("-c:s".to_string());
args.push(codec.to_string());
}
};
info!("encoding with {:?}", args.join(" "));
let mut proc = Command::new("ffmpeg")
.stdin(Stdio::piped())
.stdout(Stdio::piped())
.args(&["-f", "matroska", "-i", "pipe:0"])
.args(args)
.args(&["-f", "webm", "pipe:1"])
.spawn()?;
// let mut proc = Command::new("cat")
// .stdin(Stdio::piped())
// .stdout(Stdio::piped())
// .spawn()?;
let stdin = proc.stdin.take().unwrap();
let mut stdout = proc.stdout.take().unwrap();
input(stdin);
copy(&mut stdout, &mut output).await?;
proc.wait().await.unwrap().exit_ok()?;
info!("done");
Ok(())
},
)
.await?)
}
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