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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) 2025 metamuffin <metamuffin.org>
*/
use crate::LOCAL_VIDEO_TRANSCODING_TASKS;
use jellybase::{
cache::{async_cache_file, CachePath},
common::stream::StreamFormatInfo,
};
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 is such an impl).
pub async fn transcode(
key: &str,
enc: &StreamFormatInfo,
input: impl FnOnce(ChildStdin),
) -> anyhow::Result<CachePath> {
async_cache_file(
&["frag-tc", key, &format!("{enc:?}")],
move |mut output| async move {
let _permit = LOCAL_VIDEO_TRANSCODING_TASKS.acquire().await?;
debug!("transcoding fragment with {enc:?}");
let mut args = Vec::<String>::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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