1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
|
pub mod format;
pub mod import;
use anyhow::Result;
use jellycommon::{ItemInfo, SourceTrack, SourceTrackKind};
use jellymatroska::{
block::Block,
read::EbmlReader,
unflatten::{Unflat, Unflatten},
write::EbmlWriter,
Master, MatroskaTag,
};
use log::{debug, info, trace, warn};
use std::{collections::BTreeMap, fs::File, io::Write, path::PathBuf, sync::Arc};
pub struct RemuxerContext {}
impl RemuxerContext {
pub fn new() -> Arc<Self> {
Arc::new(Self {})
}
pub fn generate_into(
&self,
writer: impl Write + 'static,
_offset: usize,
path_base: PathBuf,
iteminfo: ItemInfo,
selection: Vec<u64>,
webm: bool,
) -> anyhow::Result<()> {
let source_path = path_base.join(&iteminfo.path);
info!("remuxing {source_path:?} to have tracks {selection:?}");
let input = File::open(source_path)?;
let mut input = EbmlReader::new(input);
let mut output = EbmlWriter::new(writer, 0);
// maps original to remuxed
let mapping = BTreeMap::from_iter(
selection
.iter()
.enumerate()
.map(|(i, e)| (*e, i as u64 + 1)),
);
info!("track mapping: {mapping:?}");
output.write_tag(&MatroskaTag::Ebml(Master::Collected(vec![
MatroskaTag::EbmlVersion(1),
MatroskaTag::EbmlReadVersion(1),
MatroskaTag::EbmlMaxIdLength(4),
MatroskaTag::EbmlMaxSizeLength(8),
MatroskaTag::DocType(if webm {
"webm".to_string()
} else {
"matroska".to_string()
}),
MatroskaTag::DocTypeVersion(4),
MatroskaTag::DocTypeReadVersion(2),
])))?;
output.write_tag(&MatroskaTag::Segment(Master::Start))?;
output.write_tag(&MatroskaTag::Info(Master::Collected(vec![
MatroskaTag::TimestampScale(1_000_000),
MatroskaTag::Duration(iteminfo.duration * 1000.0),
MatroskaTag::Title(iteminfo.title.clone()),
MatroskaTag::MuxingApp("jellyremux".to_string()),
MatroskaTag::WritingApp("jellything".to_string()),
])))?;
output.write_tag(&MatroskaTag::Tags(Master::Collected(vec![])))?;
// output.write_tag(&MatroskaTag::Cues(Master::Collected(vec![])))?;
let tracks_header = MatroskaTag::Tracks(Master::Collected(
mapping
.iter()
.map(|(norig, nrem)| track_to_ebml(*nrem, &iteminfo.tracks.get(norig).unwrap()))
.collect(),
));
info!("track header: {tracks_header:?}");
output.write_tag(&tracks_header)?;
while let Some(item) = input.next() {
let item = match item {
Ok(item) => item,
Err(e) => {
warn!("{e}");
break;
}
};
match item {
MatroskaTag::Ebml(_) => {
Unflatten::new_with_end(&mut input, item);
}
MatroskaTag::Segment(_) => {
info!("segment start");
let mut children = Unflatten::new_with_end(&mut input, item);
filter_segment(&mut children, &mut output, &iteminfo, &mapping)?;
info!("segment end");
}
_ => debug!("(r) tag ignored: {item:?}"),
}
}
output.write_tag(&MatroskaTag::Segment(Master::End))?;
Ok(())
}
}
fn filter_segment(
children: &mut Unflatten,
writer: &mut EbmlWriter,
_iteminfo: &ItemInfo,
mapping: &BTreeMap<u64, u64>,
) -> Result<()> {
while let Some(Ok(Unflat { children, item })) = children.next() {
match item {
MatroskaTag::SeekHead(_) => {}
MatroskaTag::Info(_) => {}
MatroskaTag::Cluster(_) => {
let mut cluster = vec![];
let mut children = children.unwrap();
while let Some(Ok(Unflat { children, item })) = children.next() {
match item {
MatroskaTag::Crc32(_) => (),
MatroskaTag::Timestamp(ts) => {
info!("ts={ts}");
cluster.push(MatroskaTag::Timestamp(ts));
}
MatroskaTag::BlockGroup(_) => {
debug!("group");
let mut children = children.unwrap();
let mut group = vec![];
while let Some(Ok(Unflat { children: _, item })) = children.next() {
match item {
MatroskaTag::Block(buf) => {
let mut block = Block::parse(&buf)?;
if let Some(outnum) = mapping.get(&block.track) {
block.track = *outnum;
trace!(
"block: track={} tso={}",
block.track,
block.timestamp_off
);
group.push(MatroskaTag::Block(block.dump()));
}
}
MatroskaTag::BlockDuration(v) => {
group.push(MatroskaTag::BlockDuration(v));
}
_ => debug!("ignored {item:?}"),
}
}
cluster.push(MatroskaTag::BlockGroup(Master::Collected(group)));
}
MatroskaTag::SimpleBlock(buf) => {
let mut block = Block::parse(&buf)?;
if let Some(outnum) = mapping.get(&block.track) {
block.track = *outnum;
trace!("block: track={} tso={}", block.track, block.timestamp_off);
cluster.push(MatroskaTag::SimpleBlock(block.dump()));
}
}
_ => warn!("(rsc) tag ignored: {item:?}"),
}
}
writer.write_tag(&MatroskaTag::Cluster(Master::Collected(cluster)))?;
}
MatroskaTag::Tags(_) => {}
MatroskaTag::Cues(_) => {}
MatroskaTag::Chapters(_) => {}
MatroskaTag::Tracks(_) => {}
_ => debug!("(rs) tag ignored: {item:?}"),
}
}
Ok(())
}
pub fn track_to_ebml(number: u64, track: &SourceTrack) -> MatroskaTag {
let mut els = Vec::new();
els.push(MatroskaTag::TrackNumber(number));
els.push(MatroskaTag::TrackUID(number));
els.push(MatroskaTag::FlagLacing(0));
els.push(MatroskaTag::Language(track.language.clone()));
els.push(MatroskaTag::CodecID(track.codec.clone()));
if let Some(d) = &track.default_duration {
els.push(MatroskaTag::DefaultDuration(*d));
}
match track.kind {
SourceTrackKind::Video {
width,
height,
fps: _,
} => {
els.push(MatroskaTag::TrackType(1));
els.push(MatroskaTag::DefaultDuration(41708333)); // TODO pls not hardcoded
els.push(MatroskaTag::Video(Master::Collected(vec![
MatroskaTag::PixelWidth(width),
MatroskaTag::PixelHeight(height),
])))
}
SourceTrackKind::Audio {
channels,
sample_rate,
bit_depth,
} => {
els.push(MatroskaTag::TrackType(2));
els.push(MatroskaTag::Audio(Master::Collected(vec![
MatroskaTag::SamplingFrequency(sample_rate),
MatroskaTag::Channels(channels.try_into().unwrap()),
])));
els.push(MatroskaTag::BitDepth(bit_depth.try_into().unwrap()));
}
SourceTrackKind::Subtitles => {
els.push(MatroskaTag::TrackType(19));
}
}
if let Some(d) = &track.codec_private {
els.push(MatroskaTag::CodecPrivate(d.clone()));
}
MatroskaTag::TrackEntry(Master::Collected(els))
}
// pub struct SendWriter(pub Sender<Vec<u8>>);
// impl Write for SendWriter {
// fn write(&mut self, buf: &[u8]) -> std::io::Result<usize> {
// self.0.blocking_send(buf.to_owned()).unwrap();
// Ok(buf.len())
// }
// fn flush(&mut self) -> std::io::Result<()> {
// Ok(()) // TODO should we actually do something here?
// }
// }
|
