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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::{Config, CONF, LOCAL_VIDEO_TRANSCODING_TASKS};
use anyhow::Result;
use jellycache::cache_file;
use jellyremuxer::{demuxers::create_demuxer, muxers::write_fragment, ContainerFormat};
use jellystream_types::{StreamFormatInfo, TrackKind};
use log::info;
use std::fmt::Write;
use std::fs::File;
use std::io::{copy, Write as W2};
use std::process::{Command, Stdio};
use std::thread::spawn;
use winter_matroska::{Segment, TrackEntry as MatroskaTrackEntry};
// 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 fn transcode(
kind: TrackKind,
input_key: &str,
output_format: &StreamFormatInfo,
input: Segment,
) -> Result<Segment> {
let command = transcode_command(
kind,
&input.tracks.as_ref().unwrap().entries[0],
output_format,
&*CONF,
)
.unwrap();
let output = cache_file("frag-tc", (input_key, &command), |mut output| {
let _permit = LOCAL_VIDEO_TRANSCODING_TASKS.lock().unwrap();
info!("encoding with {command:?}");
let mut args = command.split(" ");
let mut proc = Command::new(args.next().unwrap())
.stdin(Stdio::piped())
.stdout(Stdio::piped())
.args(args)
.spawn()?;
let mut stdin = proc.stdin.take().unwrap();
let mut stdout = proc.stdout.take().unwrap();
spawn(move || {
copy(&mut stdout, &mut output).unwrap();
});
write_fragment(ContainerFormat::Matroska, &mut stdin, input)?;
stdin.flush()?;
drop(stdin);
proc.wait().unwrap().exit_ok()?;
info!("done");
Ok(())
})?;
let mut demuxer = create_demuxer(
ContainerFormat::Matroska,
Box::new(File::open(output.abs())?),
);
let info = demuxer.info()?;
let tracks = demuxer.tracks()?;
let mut clusters = Vec::new();
while let Some((_, cluster)) = demuxer.read_cluster()? {
clusters.push(cluster);
}
Ok(Segment {
info,
tracks,
clusters,
..Default::default()
})
}
fn transcode_command(
kind: TrackKind,
orig_metadata: &MatroskaTrackEntry,
format: &StreamFormatInfo,
config: &Config,
) -> Result<String> {
let br = format.bitrate as u64;
let w = format.width.unwrap_or(0);
let h = format.height.unwrap_or(0);
let mut o = String::new();
write!(o, "ffmpeg -hide_banner ")?;
if kind == TrackKind::Video {
if config.enable_rkmpp {
write!(o, "-hwaccel rkmpp -hwaccel_output_format drm_prime ")?;
}
if config.enable_rkrga {
write!(o, "-afbc rga ")?;
}
write!(o, "-f matroska -i pipe:0 -copyts ")?;
if config.enable_rkrga {
write!(o, "-vf scale_rkrga=w={w}:h={h}:format=nv12:afbc=1 ")?;
} else {
write!(o, "-vf scale={w}:{h} ")?;
}
match format.codec.as_str() {
"V_MPEG4/ISO/AVC" if config.enable_rkmpp => {
write!(o, "-c:v h264_rkmpp -profile:v high -b:v {br} ")?
}
"V_MPEGH/ISO/HEVC" if config.enable_rkmpp => {
write!(o, "-c:v h265_rkmpp -profile:v high -b:v {br} ")?
}
"A_AV1" if config.use_svtav1 => {
let p = config.svtav1_preset.unwrap_or(8);
write!(o, "-c:v libsvtav1 -preset {p} -b:v {br} ")?
}
"A_AV1" if config.use_rav1e => {
let p = config.rav1e_preset.unwrap_or(8);
write!(o, "-c:v librav1e -speed {p} -b:v {br} ")?
}
"V_MPEG4/ISO/AVC" => {
let p = config.x264_preset.clone().unwrap_or("fast".to_string());
write!(o, "-c:v libx264 -preset {p} -b:v {br} ")?
}
"V_MPEGH/ISO/HEVC" => write!(o, "-c:v libx265 -b:v {br} ")?,
"V_VP8" => write!(o, "-c:v libvpx -b:v {br} ")?,
"V_VP9" => write!(o, "-c:v libvpx-vp9 -b:v {br} ")?,
"V_AV1" => {
let p = config.aom_preset.unwrap_or(1);
write!(o, "-c:v libaom -cpu-used {p} -row-mt 1 -b:v {br} ")?
}
_ => todo!(),
};
} else if kind == TrackKind::Audio {
write!(o, "-f matroska -i pipe:0 -copyts ")?;
if format.codec == "A_OPUS" && orig_metadata.audio.as_ref().unwrap().channels > 2 {
write!(o, "-ac 2 ")?;
}
match format.codec.as_str() {
"A_OPUS" => write!(o, "-c:a libopus -b:a {br} ")?,
_ => todo!(),
}
} else {
write!(o, "-f matroska -i pipe:0 -copyts ")?;
todo!()
}
write!(o, "-f matroska pipe:1")?;
Ok(o)
}
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