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use anyhow::{Result, anyhow};
use claxon::{FlacReader, FlacReaderOptions};
use flac_bound::FlacEncoder;
use metaflac::{Block, Tag};
use std::{
path::Path,
sync::{
Arc,
atomic::{AtomicBool, Ordering},
},
};
pub const CURRENT_VENDOR: &str = "reference libFLAC 1.5.0 20250211";
const BADTAGS: [&str; 2] = ["encoded_by", "encoder"];
fn write_tags(filename: impl AsRef<Path>) -> 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)?;
for block in tags.blocks() {
match block {
Block::VorbisComment(block) => {
for (key, val) in block.comments.iter() {
if !BADTAGS.contains(&key.to_lowercase().as_str()) {
output.set_vorbis(key, val.to_owned());
}
}
}
Block::Padding(_) => {}
_ => output.push_block(block.to_owned()),
}
}
output.write_to_path(temp_name)?;
Ok(())
}
fn encode_file(filename: impl AsRef<Path>, handler: Arc<AtomicBool>) -> Result<bool> {
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 num_channels: usize = streaminfo.channels.try_into()?;
let mut encoder = if let Some(encoder) = FlacEncoder::new() {
if let Ok(encoder) = encoder
.channels(streaminfo.channels)
.bits_per_sample(streaminfo.bits_per_sample)
.sample_rate(streaminfo.sample_rate)
.compression_level(8)
.verify(false)
.init_file(&temp_name)
{
encoder
} else {
return Err(anyhow!("failed to create encoder"));
}
} else {
return Err(anyhow!("failed to create encoder"));
};
let mut frame_reader = decoder.blocks();
let mut buffer = Vec::new();
let mut block_buffer = Vec::with_capacity(streaminfo.max_block_size as usize * num_channels);
while handler.load(Ordering::SeqCst) {
match frame_reader.read_next_or_eof(block_buffer) {
Ok(Some(block)) => {
for ch in 0..block.channels() {
buffer.push(block.channel(ch));
}
if encoder.process(&buffer).is_err() {
return Err(anyhow!(
"Error while processing samples:\t{:?}",
encoder.state()
));
};
buffer.clear();
buffer = buffer.into_iter().map(|_| unreachable!()).collect();
block_buffer = block.into_buffer();
}
Ok(None) => break,
Err(error) => return Err(error.into()),
}
}
if !handler.load(Ordering::SeqCst) {
let _ = encoder.finish();
std::fs::remove_file(temp_name)?;
return Ok(true);
}
if let Err(enc) = encoder.finish() {
return Err(anyhow!("Encoding failed:\t{:?}", enc.state()));
}
write_tags(&filename)?;
std::fs::rename(temp_name, filename)?;
Ok(false)
}
pub fn handle_encode(filename: impl AsRef<Path>, handler: Arc<AtomicBool>) -> Result<bool> {
match encode_file(&filename, handler) {
Err(error) => {
let _ = std::fs::remove_file(filename.as_ref().with_extension("tmp"));
Err(error)
}
Ok(res) => Ok(res),
}
}
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 = "./samples/16bit.flac";
let tempname = "./samples/16bit.flac.temp";
std::fs::copy(name, tempname).unwrap();
let handler = Arc::new(AtomicBool::new(true));
encode_file(name, handler).unwrap();
let output = std::process::Command::new("flac")
.arg("-wts")
.arg(name)
.status();
std::fs::rename(tempname, name).unwrap();
assert!(output.unwrap().success());
}
#[test]
fn bit24() {
let name = "./samples/24bit.flac";
let tempname = "./samples/24bit.flac.temp";
std::fs::copy(name, tempname).unwrap();
let handler = Arc::new(AtomicBool::new(true));
encode_file(name, handler).unwrap();
let output = std::process::Command::new("flac")
.arg("-wts")
.arg(name)
.status();
std::fs::rename(tempname, name).unwrap();
assert!(output.unwrap().success());
}
#[test]
fn bit32() {
let name = "./samples/32bit.flac";
let tempname = "./samples/32bit.flac.temp";
std::fs::copy(name, tempname).unwrap();
let handler = Arc::new(AtomicBool::new(true));
encode_file(name, handler).unwrap();
let output = std::process::Command::new("flac")
.arg("-wts")
.arg(name)
.status();
std::fs::rename(tempname, name).unwrap();
assert!(output.unwrap().success());
}
}
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