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use anyhow::{Result, anyhow};
use claxon::{FlacReader, FlacReaderOptions};
use flac_bound::FlacEncoder;
use md5::{Digest, Md5};
use metaflac::{Block, Tag};
use std::path::Path;
pub const CURRENT_VENDOR: &str = "reference libFLAC 1.5.0 20250211";
fn write_tags(filename: impl AsRef<Path>, hash: Vec<u8>) -> Result<()> {
let tags = Tag::read_from_path(&filename)?;
let temp_name = filename.as_ref().with_extension("tmp");
let mut output = Tag::read_from_path(&temp_name)?;
let mut streaminfo = tags.get_streaminfo().unwrap().clone();
streaminfo.md5 = hash;
output.set_streaminfo(streaminfo);
for block in tags.blocks() {
match block {
Block::VorbisComment(comment) => {
for (key, val) in comment.comments.clone() {
if key != "ENCODER" {
output.set_vorbis(key, val);
}
}
}
Block::StreamInfo(_) | Block::Padding(_) => {}
_ => output.push_block(block.clone()),
}
}
output.write_to_path(temp_name)?;
Ok(())
}
fn encode_file(filename: impl AsRef<Path>) -> Result<()> {
let temp_name = filename.as_ref().with_extension("tmp");
if temp_name.exists() {
std::fs::remove_file(&temp_name)?;
}
let mut decoder = FlacReader::open(&filename)?;
let streaminfo = decoder.streaminfo();
let mut encoder = FlacEncoder::new()
.unwrap()
.channels(streaminfo.channels)
.bits_per_sample(streaminfo.bits_per_sample)
.sample_rate(streaminfo.sample_rate)
.compression_level(8)
.verify(false)
.init_file(&temp_name)
.unwrap();
let mut hasher = Md5::new();
let samples = decoder
.samples()
.map(|res| {
let sample = res.unwrap();
match streaminfo.bits_per_sample {
16 => {
hasher.update(i16::try_from(sample).unwrap().to_le_bytes());
}
24 => {
hasher.update(i24::i24::try_from_i32(sample).unwrap().to_le_bytes());
}
32 => {
hasher.update(sample.to_le_bytes());
}
_ => {}
}
sample
})
.collect::<Vec<i32>>();
encoder
.process_interleaved(&samples, samples.len() as u32 / streaminfo.channels)
.unwrap();
if let Err(enc) = encoder.finish() {
return Err(anyhow!("Encoding failed:\t{:?}", enc.state()));
}
let hash = hasher.finalize().to_vec();
write_tags(&filename, hash)?;
std::fs::rename(temp_name, filename)?;
Ok(())
}
pub fn handle_encode(filename: impl AsRef<Path>) -> Result<()> {
if let Err(error) = encode_file(&filename) {
let _ = std::fs::remove_file(filename.as_ref().with_extension("tmp"));
Err(error)
} else {
Ok(())
}
}
pub fn get_vendor(file: impl AsRef<Path>) -> Result<String> {
if let Some(vendor) = FlacReader::open_ext(
file,
FlacReaderOptions {
metadata_only: true,
read_vorbis_comment: true,
},
)?
.vendor()
{
Ok(vendor.to_string())
} else {
Err(anyhow!("Vendor string not found"))
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn bit16() {
let name = "16bit.flac";
let tempname = "16bit.flac.temp";
std::fs::copy(name, tempname).unwrap();
encode_file(name).unwrap();
let target_md5 = FlacReader::open(tempname).unwrap().streaminfo().md5sum;
let temp_md5 = FlacReader::open(name).unwrap().streaminfo().md5sum;
std::fs::rename(tempname, name).unwrap();
assert_eq!(target_md5, temp_md5);
}
#[test]
fn bit24() {
let name = "24bit.flac";
let tempname = "24bit.flac.temp";
std::fs::copy(name, tempname).unwrap();
encode_file(name).unwrap();
let target_md5 = FlacReader::open(tempname).unwrap().streaminfo().md5sum;
let temp_md5 = FlacReader::open(name).unwrap().streaminfo().md5sum;
std::fs::rename(tempname, name).unwrap();
assert_eq!(target_md5, temp_md5);
}
#[test]
fn bit32() {
let name = "32bit.flac";
let tempname = "32bit.flac.temp";
std::fs::copy(name, tempname).unwrap();
encode_file(name).unwrap();
let target_md5 = FlacReader::open(tempname).unwrap().streaminfo().md5sum;
let temp_md5 = FlacReader::open(name).unwrap().streaminfo().md5sum;
std::fs::rename(tempname, name).unwrap();
assert_eq!(target_md5, temp_md5);
}
}
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