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
|
use anyhow::{Result, anyhow};
use flac_bound::{FlacEncoder, WriteWrapper};
use i24::i24;
use md5::{Digest, Md5};
use metaflac::{Block, Tag};
use std::fs::File;
use symphonia::core::{
audio::{Audio, GenericAudioBufferRef},
formats::{FormatOptions, TrackType, probe::Hint},
io::MediaSourceStream,
meta::MetadataOptions,
};
struct StreamConfig {
channels: u32,
bits_per_sample: Bps,
sample_rate: u32,
}
enum Bps {
_16,
_24,
_32,
}
impl Bps {
fn new(num: u32) -> Result<Self> {
match num {
16 => Ok(Bps::_16),
24 => Ok(Bps::_24),
32 => Ok(Bps::_32),
_ => Err(anyhow!("Invalid BPS")),
}
}
fn value(&self) -> u32 {
match self {
Bps::_16 => 16,
Bps::_24 => 24,
Bps::_32 => 32,
}
}
}
pub fn encode_file(file: &std::path::Path) -> Result<()> {
let src = std::fs::File::open(file)?;
let mss = MediaSourceStream::new(Box::new(src), Default::default());
let mut hint = Hint::new();
hint.with_extension("flac");
let format_opts: FormatOptions = Default::default();
let metadata_opts: MetadataOptions = Default::default();
let mut format = symphonia::default::get_probe()
.probe(&hint, mss, format_opts, metadata_opts)
.unwrap();
let track = format.default_track(TrackType::Audio).unwrap();
let mut decoder = symphonia::default::get_codecs()
.make_audio_decoder(
track.codec_params.as_ref().unwrap().audio().unwrap(),
&Default::default(),
)
.unwrap();
let track_id = track.id;
let params = track.codec_params.as_ref().unwrap().audio().unwrap();
let config = StreamConfig {
channels: u32::try_from(params.channels.as_ref().unwrap().count()).unwrap(),
bits_per_sample: Bps::new(params.bits_per_sample.unwrap())?,
sample_rate: params.sample_rate.unwrap(),
};
let tempname = format!("{}.tmp", file.display());
let mut outf = File::create(&tempname)?;
let mut outw = WriteWrapper(&mut outf);
let mut enc = FlacEncoder::new()
.unwrap()
.channels(config.channels)
.bits_per_sample(config.bits_per_sample.value())
.sample_rate(config.sample_rate)
.compression_level(8)
.verify(false)
.init_write(&mut outw)
.unwrap();
let mut hasher = Md5::new();
let mut sample_buf: Vec<i32> = Vec::new();
loop {
let packet = match format.next_packet() {
Ok(Some(packet)) => packet,
Ok(None) => break,
Err(error) => return Err(error.into()),
};
if packet.track_id() != track_id {
continue;
}
match decoder.decode(&packet) {
Ok(audio_buf) => match audio_buf {
GenericAudioBufferRef::S32(buf) => {
match config.bits_per_sample {
Bps::_16 => {
let _ = buf
.iter_interleaved()
.map(|sample| {
let real_sample =
sample >> (32 - config.bits_per_sample.value());
hasher
.update(i16::try_from(real_sample).unwrap().to_le_bytes());
sample_buf.push(real_sample);
})
.collect::<Vec<_>>();
}
Bps::_24 => {
let _ = buf
.iter_interleaved()
.map(|sample| {
let real_sample =
sample >> (32 - config.bits_per_sample.value());
hasher.update(
i24::try_from_i32(real_sample).unwrap().to_le_bytes(),
);
sample_buf.push(real_sample);
})
.collect::<Vec<_>>();
}
Bps::_32 => return Err(anyhow!("how did you get here")),
}
enc.process_interleaved(
sample_buf.as_slice(),
u32::try_from(buf.samples_planar()).unwrap(),
)
.unwrap();
sample_buf.clear();
}
_ => return Err(anyhow!("unsupported codec")),
},
Err(err) => return Err(err.into()),
}
}
if let Err(enc) = enc.finish() {
return Err(anyhow!("Encoding failed:\t{:?}", enc.state()));
}
let tags = Tag::read_from_path(file)?;
let mut output = Tag::read_from_path(&tempname)?;
let mut streaminfo = tags.get_streaminfo().unwrap().clone();
streaminfo.md5 = hasher.finalize()[..].to_vec();
output.set_streaminfo(streaminfo);
for block in tags.blocks() {
match block {
Block::VorbisComment(comment) => {
for (key, val) in comment.comments.clone() {
output.set_vorbis(key, val);
}
}
Block::StreamInfo(_) => {}
_ => output.push_block(block.clone()),
}
}
output.write_to_path(tempname)?;
Ok(())
}
|
