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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) 2026 metamuffin <metamuffin.org>
*/
use crate::{SMediaInfo, fragment_index::fragment_index, stream_info};
use anyhow::Result;
use jellystream_types::{StreamContainer, StreamFormatInfo, TrackKind};
use std::{
fmt::{Display, Write},
io::{Cursor, Read},
ops::Range,
};
pub fn dash(sinfo: &SMediaInfo) -> Result<Box<dyn Read + Send + Sync>> {
let (_iinfo, info) = stream_info(&sinfo)?;
let mut out = String::new();
writeln!(
out,
"<?xml version=\"1.0\" encoding=\"utf-8\"?> \
<MPD xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" \
xmlns=\"urn:mpeg:dash:schema:mpd:2011\" \
xmlns:xlink=\"http://www.w3.org/1999/xlink\" \
xsi:schemaLocation=\"urn:mpeg:DASH:schema:MPD:2011 http://standards.iso.org/ittf/PubliclyAvailableStandards/MPEG-DASH_schema_files/DASH-MPD.xsd\" \
profiles=\"urn:mpeg:dash:profile:isoff-live:2011\" \
type=\"static\" \
mediaPresentationDuration=\"{}\" \
maxSegmentDuration=\"PT5.0S\" \
minBufferTime=\"PT10.0S\">",
Time(info.duration)
)?;
writeln!(out, "<ProgramInformation></ProgramInformation>")?;
writeln!(out, "<ServiceDescription id=\"0\"></ServiceDescription>")?;
writeln!(out, r#"<Period id="0" start="PT0.0S">"#)?;
for (as_id, track) in info.tracks.iter().enumerate() {
let frags = fragment_index(&sinfo, as_id)?;
match track.kind {
TrackKind::Video => {
let max_width = track
.formats
.iter()
.flat_map(|f| f.width)
.max()
.unwrap_or_default();
let max_height = track
.formats
.iter()
.flat_map(|f| f.height)
.max()
.unwrap_or_default();
let framerate = "2997/1000";
let par = "16:9"; // TODO
writeln!(
out,
"<AdaptationSet \
id=\"{as_id}\" \
contentType=\"video\" \
startWithSAP=\"1\" \
segmentAlignment=\"true\" \
bitstreamSwitching=\"true\" \
frameRate=\"{framerate}\" \
maxWidth=\"{max_width}\" \
maxHeight=\"{max_height}\" \
par=\"{par}\" \
lang=\"eng\">"
)?;
for (repr_id, format) in track.formats.iter().enumerate() {
let StreamFormatInfo {
width: Some(width),
height: Some(height),
bitrate,
..
} = format
else {
unreachable!()
};
let container = choose_container(format);
let container_mime = container.mime_type(track.kind);
let codec_param = &format.codec_param;
writeln!(
out,
"<Representation \
id=\"{repr_id}\" \
mimeType=\"{container_mime}\" \
codecs=\"{codec_param}\" \
bandwidth=\"{bitrate:.0}\" \
width=\"{width}\" \
height=\"{height}\" \
scanType=\"unknown\" \
sar=\"1:1\">"
)?;
write_segment_template(&mut out, as_id, container, &frags)?;
writeln!(out, "</Representation>")?;
}
writeln!(out, "</AdaptationSet>")?;
}
TrackKind::Audio => {
writeln!(
out,
"<AdaptationSet \
id=\"{as_id}\" \
contentType=\"audio\" \
startWithSAP=\"1\" \
segmentAlignment=\"true\" \
bitstreamSwitching=\"true\">"
)?;
for (repr_id, format) in track.formats.iter().enumerate() {
let StreamFormatInfo {
bitrate,
samplerate: Some(samplerate),
..
} = format
else {
unreachable!()
};
let container = choose_container(format);
let container_mime = container.mime_type(track.kind);
let codec_param = &format.codec_param;
writeln!(
out,
"<Representation \
id=\"{repr_id}\" \
mimeType=\"{container_mime}\" \
codecs=\"{codec_param}\" \
bandwidth=\"{bitrate:.0}\" \
audioSamplingRate=\"{samplerate:.0}\">"
)?;
write_segment_template(&mut out, as_id, container, &frags)?;
writeln!(out, "</Representation>")?;
}
writeln!(out, "</AdaptationSet>")?;
}
TrackKind::Subtitle => (),
}
}
writeln!(out, r#"</Period>"#)?;
writeln!(out, r#"</MPD>"#)?;
Ok(Box::new(Cursor::new(out)))
}
fn choose_container(format: &StreamFormatInfo) -> StreamContainer {
if format.containers.contains(&StreamContainer::WebM) {
StreamContainer::WebM
} else if format.containers.contains(&StreamContainer::MP4) {
StreamContainer::MP4
} else {
StreamContainer::Matroska
}
}
fn write_segment_template(
out: &mut String,
as_id: usize,
container: StreamContainer,
frags: &[Range<f64>],
) -> Result<()> {
writeln!(
out,
"<SegmentTemplate \
timescale=\"1000\" \
initialization=\"stream?fragmentinit&t={as_id}&c={container}&f=$RepresentationID$\" \
media=\"stream?fragment&t={as_id}&c={container}&f=$RepresentationID$&i=$Number$\" \
startNumber=\"0\">"
)?;
writeln!(out, "{}", Timeline(&frags))?;
writeln!(out, "</SegmentTemplate>")?;
Ok(())
}
struct Time(f64);
impl Display for Time {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(f, "PT{:.01}S", self.0)
}
}
struct Timeline<'a>(&'a [Range<f64>]);
impl Display for Timeline<'_> {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(f, "<SegmentTimeline>")?;
let mut c = 0;
let mut last_t = 0;
let mut last_d = 0;
let mut r = 0;
let mut first = true;
for seg in self.0 {
let t = (seg.end * 1000.) as i64;
let d = t - last_t;
if d != last_d && last_d != 0 {
match (r, first) {
(1, true) => write!(f, r#"<S t="0" d="{last_d}" />"#)?,
(1, false) => write!(f, r#"<S d="{last_d}" />"#)?,
(_, true) => write!(f, r#"<S t="0" d="{last_d}" r="{r}" />"#)?,
(_, false) => write!(f, r#"<S d="{last_d}" r="{r}" />"#)?,
}
first = false;
c += r;
r = 1;
} else {
r += 1;
}
last_t = t;
last_d = d;
}
c += r;
match (r, first) {
(1, true) => write!(f, r#"<S t="0" d="{last_d}" />"#)?,
(1, false) => write!(f, r#"<S d="{last_d}" />"#)?,
(_, true) => write!(f, r#"<S t="0" d="{last_d}" r="{r}" />"#)?,
(_, false) => write!(f, r#"<S d="{last_d}" r="{r}" />"#)?,
}
assert_eq!(c, self.0.len());
write!(f, "</SegmentTimeline>")?;
Ok(())
}
}
|
