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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) 2023 metamuffin <metamuffin.org>
*/
use jellybase::cache::async_cache_file;
use jellycommon::AssetLocation;
use log::info;
use std::process::Stdio;
use tokio::{
io::copy,
process::{ChildStdin, Command},
};
#[derive(Debug)]
pub enum Encoding {
Video {
codec: &'static str,
preset: u8,
bitrate: usize,
width: usize,
},
}
pub async fn transcode(
key: &str,
enc: Encoding,
input: impl FnOnce(ChildStdin),
) -> anyhow::Result<AssetLocation> {
Ok(async_cache_file(
&["snip-tc", key, &format!("{enc:?}")],
move |mut output| async move {
info!("transcoding snippet {key}");
let args = match enc {
Encoding::Video {
codec,
preset,
bitrate,
width,
} => [
"-vf".to_string(),
format!("scale={width}:-1"),
"-c:v".to_string(),
codec.to_string(),
"-preset".to_string(),
format!("{preset}"),
"-b:v".to_string(),
format!("{bitrate}"),
]
.to_vec(),
};
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 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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