commit a6546430e05fb631e2d609102cf5c8aabc6b96de
Author: mtmn <miro@haravara.org>
Date: Wed, 6 May 2026 02:08:46 +0200
feat: init
Diffstat:
| A | .gitignore | | | 1 | + |
| A | Cargo.lock | | | 1558 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | Cargo.toml | | | 17 | +++++++++++++++++ |
| A | LICENSE | | | 21 | +++++++++++++++++++++ |
| A | README.md | | | 55 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | src/audio_processing.rs | | | 159 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | src/constants.rs | | | 22 | ++++++++++++++++++++++ |
| A | src/file_io.rs | | | 202 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | src/main.rs | | | 116 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | src/types.rs | | | 18 | ++++++++++++++++++ |
10 files changed, 2169 insertions(+), 0 deletions(-)
diff --git a/.gitignore b/.gitignore
@@ -0,0 +1 @@
+target
diff --git a/Cargo.lock b/Cargo.lock
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diff --git a/Cargo.toml b/Cargo.toml
@@ -0,0 +1,17 @@
+[package]
+name = "virittaa"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+bliss-audio = { version = "0.11.2", features = ["bench"] }
+bliss-audio-aubio-rs = "0.2.4"
+ndarray = "0.17.2"
+anyhow = "1.0.45"
+clap = { version = "4.5.35", features = ["cargo"] }
+walkdir = "2.5"
+lofty = "0.24.0"
+rayon = "1.10"
+chrono = "0.4.43"
+csv = "1.3"
+serde = { version = "1.0", features = ["derive"] }
diff --git a/LICENSE b/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2026 mtmn
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/README.md b/README.md
@@ -0,0 +1,55 @@
+# virittaa
+
+A command-line tool that analyzes audio files to detect `BPM` and `Key` tags.
+
+## Features
+
+* Detect BPM and Key of audio files
+* Write detected BPM and Key to metadata tags
+* Generate CSV reports of analyzed tracks
+
+## Building
+
+To build the project, run:
+
+```sh
+cargo build --release
+```
+
+## Usage
+
+```sh
+./target/release/virittaa [OPTIONS] <PATH>...
+```
+
+### Arguments
+
+* `<PATH>...`: One or more files or directories to analyze.
+
+### Options
+
+* `-w`, `--write-tags`: Write detected BPM and Key to audio file metadata.
+* `-f`, `--force`: Re-analyze files even if they already have BPM/Key tags.
+* `-j`, `--jobs <JOBS>`: Number of threads to use (0 = all cores).
+* `-r`, `--report`: Generate a CSV report with timestamped filename.
+* `-h`, `--help`: Print help information.
+* `-V`, `--version`: Print version information.
+
+### Example
+
+```sh
+# Analyze a single file
+./target/release/virittaa /path/to/track.mp3
+
+# Analyze a directory and write metadata tags
+./target/release/virittaa --write-tags /path/to/music/
+
+# Re-analyze files that already have tags
+./target/release/virittaa --force --write-tags /path/to/music/
+
+# Limit to 4 threads
+./target/release/virittaa -j 4 /path/to/music/
+
+# Generate a CSV report
+./target/release/virittaa --report /path/to/music/
+```
diff --git a/src/audio_processing.rs b/src/audio_processing.rs
@@ -0,0 +1,159 @@
+use anyhow::Result;
+use bliss_audio::chroma::bench::{chroma_stft, estimate_tuning};
+use bliss_audio::utils::bench::stft;
+use bliss_audio_aubio_rs::{OnsetMode, Tempo};
+use ndarray::Array1;
+use crate::constants::{
+ SAMPLE_RATE, BPM_HOP_SIZE, BPM_MAX, BPM_MIN, BPM_OFFSET, BPM_WINDOW_SIZE, CHROMA_BINS,
+ KEY_HOP_SIZE, KEY_WINDOW_SIZE, TUNING_PRECISION,
+};
+
+/// Calculate the BPM of a track.
+///
+/// # Panics
+///
+/// Panics if the internal tempo object cannot be created or if a single tempo
+/// calculation fails.
+#[must_use]
+pub fn calculate_bpm(samples: &[f32]) -> f32 {
+ let window_size = BPM_WINDOW_SIZE;
+ let hop_size = BPM_HOP_SIZE;
+ let mut tempo = Tempo::new(OnsetMode::SpecFlux, window_size, hop_size, SAMPLE_RATE)
+ .expect("Failed to create tempo object");
+ let mut bpms = Vec::new();
+
+ for chunk in samples.chunks(hop_size) {
+ let mut padded = chunk.to_vec();
+ if padded.len() < hop_size {
+ padded.resize(hop_size, 0.0);
+ }
+ if tempo.do_result(&padded).expect("Failed to calculate tempo") > 0.0 {
+ bpms.push(tempo.get_bpm());
+ }
+ }
+
+ if bpms.is_empty() {
+ return 0.0;
+ }
+
+ bpms.sort_by(f32::total_cmp);
+ let median_bpm = bpms[bpms.len() / 2];
+
+ normalize_bpm(median_bpm)
+}
+
+fn normalize_bpm(mut bpm: f32) -> f32 {
+ if bpm > 0.0 {
+ bpm += BPM_OFFSET;
+ }
+
+ if bpm > 0.0 {
+ while bpm > BPM_MAX {
+ bpm /= 2.0;
+ }
+ while bpm < BPM_MIN {
+ bpm *= 2.0;
+ }
+ }
+
+ bpm
+}
+
+/// Calculate the key of a track.
+///
+/// # Errors
+///
+/// Returns an error if the key cannot be calculated.
+pub fn calculate_key(samples: &[f32]) -> Result<String> {
+ let global_chroma = calculate_global_chroma(samples)?;
+ let (best_key_idx, best_mode) = find_best_key(&global_chroma);
+ let key_names = [
+ "C", "C#", "D", "D#", "E", "F", "F#", "G", "G#", "A", "A#", "B",
+ ];
+ Ok(format!("{} {}", key_names[best_key_idx], best_mode))
+}
+
+#[allow(clippy::cast_possible_truncation)]
+fn calculate_global_chroma(samples: &[f32]) -> Result<Array1<f64>> {
+ let window_size = KEY_WINDOW_SIZE;
+ let hop_size = KEY_HOP_SIZE;
+
+ let mut spectrum = stft(samples, window_size, hop_size);
+
+ let tuning = estimate_tuning(
+ SAMPLE_RATE,
+ &spectrum,
+ window_size,
+ TUNING_PRECISION,
+ CHROMA_BINS as _,
+ )?;
+
+ let n_chroma = CHROMA_BINS as u32;
+ let chroma = chroma_stft(SAMPLE_RATE, &mut spectrum, window_size, n_chroma, tuning)?;
+
+ let shape = chroma.shape();
+ let mut result = vec![0.0; shape[0]];
+ for i in 0..shape[0] {
+ for j in 0..shape[1] {
+ result[i] += chroma[[i, j]];
+ }
+ }
+
+ Ok(Array1::from_vec(result))
+}
+
+fn find_best_key(global_chroma: &Array1<f64>) -> (usize, &'static str) {
+ let major_profile = ndarray::arr1(&[
+ 6.35, 2.23, 3.48, 2.33, 4.38, 4.09, 2.52, 5.19, 2.39, 3.66, 2.29, 2.88,
+ ]);
+ let minor_profile = ndarray::arr1(&[
+ 6.33, 2.68, 3.52, 5.38, 2.60, 3.53, 2.54, 4.75, 3.98, 2.69, 3.34, 3.17,
+ ]);
+
+ let mut max_corr = -1.0;
+ let mut best_key_idx = 0;
+ let mut best_mode = "Major";
+
+ for i in 0..CHROMA_BINS {
+ let rotated_major = rotate_array(&major_profile, i);
+ let rotated_minor = rotate_array(&minor_profile, i);
+
+ let corr_major = pearson_correlation(global_chroma, &rotated_major);
+ if corr_major > max_corr {
+ max_corr = corr_major;
+ best_key_idx = i;
+ best_mode = "Major";
+ }
+
+ let corr_minor = pearson_correlation(global_chroma, &rotated_minor);
+ if corr_minor > max_corr {
+ max_corr = corr_minor;
+ best_key_idx = i;
+ best_mode = "Minor";
+ }
+ }
+
+ (best_key_idx, best_mode)
+}
+
+fn rotate_array(arr: &Array1<f64>, shift: usize) -> Array1<f64> {
+ let n = arr.len();
+ Array1::from_iter((0..n).map(|j| arr[(j + n - shift) % n]))
+}
+
+fn pearson_correlation(v1: &Array1<f64>, v2: &Array1<f64>) -> f64 {
+ let mean1 = v1.mean().expect("Failed to calculate mean");
+ let mean2 = v2.mean().expect("Failed to calculate mean");
+ let num: f64 = v1
+ .iter()
+ .zip(v2.iter())
+ .map(|(x, y)| (x - mean1) * (y - mean2))
+ .sum();
+ let den1: f64 = v1.iter().map(|x| (x - mean1).powi(2)).sum();
+ let den2: f64 = v2.iter().map(|y| (y - mean2).powi(2)).sum();
+ if den1 == 0.0 || den2 == 0.0 {
+ 0.0
+ } else {
+ num / (den1.sqrt() * den2.sqrt())
+ }
+}
diff --git a/src/constants.rs b/src/constants.rs
@@ -0,0 +1,22 @@
+//! Audio processing constants
+
+pub const SAMPLE_RATE: u32 = 22050;
+
+// BPM
+pub const BPM_WINDOW_SIZE: usize = 1024;
+pub const BPM_HOP_SIZE: usize = 128;
+pub const BPM_OFFSET: f32 = -1.15;
+pub const BPM_MIN: f32 = 80.0;
+pub const BPM_MAX: f32 = 160.0;
+
+// Key
+pub const KEY_WINDOW_SIZE: usize = 8192;
+pub const KEY_HOP_SIZE: usize = 2205;
+pub const TUNING_PRECISION: f64 = 0.01;
+pub const CHROMA_BINS: usize = 12;
+
+// Supported audio file extensions
+pub const SUPPORTED_EXTENSIONS: &[&str] = &[
+ "aac", "ape", "aif", "aiff", "flac", "mp3", "mp4", "m4a", "mpc", "opus", "ogg", "spx", "wav",
+ "wv",
+];
diff --git a/src/file_io.rs b/src/file_io.rs
@@ -0,0 +1,202 @@
+use anyhow::Result;
+use chrono::Local;
+use lofty::config::WriteOptions;
+use lofty::prelude::*;
+use lofty::probe::Probe;
+use lofty::tag::{ItemKey, Tag};
+use std::borrow::Cow;
+use std::path::Path;
+
+use crate::audio_processing::{calculate_bpm, calculate_key};
+use crate::types::{TrackError, TrackInfo};
+use bliss_audio::decoder::ffmpeg::FFmpegDecoder as Decoder;
+use bliss_audio::decoder::Decoder as DecoderTrait;
+
+#[derive(Debug, Default)]
+pub struct FileMetadata {
+ pub artist: Option<String>,
+ pub album: Option<String>,
+ pub track: Option<String>,
+ pub label: Option<String>,
+}
+
+fn build_track_info(path: &Path, metadata: FileMetadata, bpm: f32, key: String) -> TrackInfo {
+ TrackInfo {
+ path: path.to_path_buf(),
+ artist: metadata.artist,
+ album: metadata.album,
+ track: metadata.track,
+ label: metadata.label,
+ bpm,
+ key,
+ }
+}
+
+/// Process a single file.
+///
+/// # Errors
+///
+/// Returns an error if the file cannot be processed.
+pub fn process_file(path: &Path, write_tags: bool, force: bool) -> Result<TrackInfo, String> {
+ let metadata = read_metadata(path);
+
+ if !force && let Some((bpm, key)) = read_existing_tags(path) {
+ println!(
+ "File: {}, BPM: {:.1}, Key: {} (existing tags)",
+ path.display(),
+ bpm,
+ key
+ );
+ return Ok(build_track_info(path, metadata, bpm, key));
+ }
+
+ let song = Decoder::decode(path).map_err(|e| format!("Error decoding: {e}"))?;
+ let samples = &song.sample_array;
+
+ let bpm = calculate_bpm(samples);
+ let key = calculate_key(samples).map_err(|e| format!("Error calculating key: {e}"))?;
+
+ println!("File: {}, BPM: {bpm:.1}, Key: {key}", path.display());
+
+ if write_tags && let Err(e) = write_metadata(path, bpm, &key) {
+ eprintln!("Error writing metadata for {}: {e}", path.display());
+ }
+
+ Ok(build_track_info(path, metadata, bpm, key))
+}
+
+pub fn read_metadata(path: &Path) -> FileMetadata {
+ match Probe::open(path).and_then(Probe::read) {
+ Ok(tagged_file) => {
+ let tag = tagged_file
+ .primary_tag()
+ .or_else(|| tagged_file.first_tag());
+ if let Some(t) = tag {
+ FileMetadata {
+ artist: t
+ .get_string(ItemKey::TrackArtist)
+ .or_else(|| t.get_string(ItemKey::AlbumArtist))
+ .map(String::from),
+ album: t.get_string(ItemKey::AlbumTitle).map(String::from),
+ track: t.get_string(ItemKey::TrackTitle).map(String::from),
+ label: t.get_string(ItemKey::Label).map(String::from),
+ }
+ } else {
+ FileMetadata::default()
+ }
+ }
+ Err(_) => FileMetadata::default(),
+ }
+}
+
+fn read_existing_tags(path: &Path) -> Option<(f32, String)> {
+ match Probe::open(path).and_then(Probe::read) {
+ Ok(tagged_file) => {
+ let tag = tagged_file
+ .primary_tag()
+ .or_else(|| tagged_file.first_tag())?;
+ let bpm_str = tag.get_string(ItemKey::Bpm)?;
+ let key = tag.get_string(ItemKey::InitialKey)?;
+
+ let bpm = bpm_str.parse::<f32>().ok()?;
+ Some((bpm, key.to_string()))
+ }
+ Err(_) => None,
+ }
+}
+
+#[derive(serde::Serialize)]
+#[serde(rename_all = "PascalCase")]
+struct ReportRecord<'a> {
+ path: Cow<'a, str>,
+ artist: Option<&'a str>,
+ album: Option<&'a str>,
+ track: Option<&'a str>,
+ label: Option<&'a str>,
+ #[serde(rename = "BPM")]
+ bpm: Option<String>,
+ key: Option<&'a str>,
+ status: &'a str,
+ error: Option<&'a str>,
+}
+
+/// Write a CSV report of the processed tracks.
+///
+/// # Errors
+///
+/// Returns an error if the report cannot be written.
+pub fn write_report(results: &[TrackInfo], errors: &[TrackError]) -> Result<()> {
+ let timestamp = Local::now().format("%Y-%m-%dT%H-%M-%S").to_string();
+ let filename = format!("virittaa-report-{timestamp}.csv");
+
+ let mut wtr = csv::Writer::from_path(&filename)?;
+
+ for track in results {
+ wtr.serialize(ReportRecord {
+ path: track.path.to_string_lossy(),
+ artist: track.artist.as_deref(),
+ album: track.album.as_deref(),
+ track: track.track.as_deref(),
+ label: track.label.as_deref(),
+ bpm: Some(format!("{:.1}", track.bpm)),
+ key: Some(&track.key),
+ status: "Success",
+ error: None,
+ })?;
+ }
+
+ for error in errors {
+ wtr.serialize(ReportRecord {
+ path: error.path.to_string_lossy(),
+ artist: None,
+ album: None,
+ track: None,
+ label: None,
+ bpm: None,
+ key: None,
+ status: "Error",
+ error: Some(&error.reason),
+ })?;
+ }
+
+ wtr.flush()?;
+ println!("Report written to: {filename}");
+ Ok(())
+}
+
+/// Write BPM and key metadata to a file.
+///
+/// # Errors
+///
+/// Returns an error if the metadata cannot be written.
+///
+/// # Panics
+///
+/// Panics if there are no tags and a new tag cannot be created.
+pub fn write_metadata(path: &Path, bpm: f32, key: &str) -> Result<()> {
+ let mut tagged_file = Probe::open(path)?.read()?;
+ let tag = match tagged_file.primary_tag_mut() {
+ Some(primary_tag) => primary_tag,
+ None => {
+ if let Some(first_tag) = tagged_file.first_tag_mut() {
+ first_tag
+ } else {
+ // If there are no tags, create a new one based on the file type
+ let tag_type = tagged_file.primary_tag_type();
+ tagged_file.insert_tag(Tag::new(tag_type));
+ tagged_file
+ .primary_tag_mut()
+ .expect("Failed to create new tag")
+ }
+ }
+ };
+
+ tag.insert_text(ItemKey::Bpm, bpm.round().to_string());
+ tag.insert_text(ItemKey::InitialKey, key.to_string());
+ if let Some(tkey) = ItemKey::from_key(tag.tag_type(), "TKEY") {
+ tag.insert_text(tkey, key.to_string());
+ }
+
+ tag.save_to_path(path, WriteOptions::default())?;
+ Ok(())
+}
diff --git a/src/main.rs b/src/main.rs
@@ -0,0 +1,116 @@
+pub mod audio_processing;
+pub mod constants;
+pub mod file_io;
+pub mod types;
+
+use anyhow::Result;
+use clap::{Arg, Command};
+use rayon::prelude::*;
+use std::path::PathBuf;
+use walkdir::WalkDir;
+
+use crate::file_io::{process_file, write_report};
+use crate::types::TrackError;
+
+use crate::constants::SUPPORTED_EXTENSIONS;
+
+fn is_supported_audio_file(path: &std::path::Path) -> bool {
+ path.is_file() && path.extension().is_some_and(is_supported_extension)
+}
+
+fn is_supported_extension(ext: &std::ffi::OsStr) -> bool {
+ let ext_str = ext.to_string_lossy().to_lowercase();
+ SUPPORTED_EXTENSIONS.contains(&ext_str.as_ref())
+}
+
+fn main() -> Result<()> {
+ let matches = Command::new("virittaa")
+ .version(clap::crate_version!())
+ .arg(Arg::new("path").required(true).num_args(1..))
+ .arg(
+ Arg::new("write-tags")
+ .short('w')
+ .long("write-tags")
+ .action(clap::ArgAction::SetTrue)
+ .help("Write BPM and Key to file metadata"),
+ )
+ .arg(
+ Arg::new("force")
+ .short('f')
+ .long("force")
+ .action(clap::ArgAction::SetTrue)
+ .help("Re-analyze files even if they already have BPM/Key tags"),
+ )
+ .arg(
+ Arg::new("jobs")
+ .short('j')
+ .long("jobs")
+ .help("Number of threads to use (0 = all cores)")
+ .default_value("0")
+ .value_parser(clap::value_parser!(usize)),
+ )
+ .arg(
+ Arg::new("report")
+ .short('r')
+ .long("report")
+ .action(clap::ArgAction::SetTrue)
+ .help("Generate a CSV report file in the current directory"),
+ )
+ .get_matches();
+
+ let write_tags = matches.get_flag("write-tags");
+ let force = matches.get_flag("force");
+ let jobs = *matches.get_one::<usize>("jobs").unwrap();
+ let generate_report = matches.get_flag("report");
+
+ if jobs > 0 {
+ rayon::ThreadPoolBuilder::new()
+ .num_threads(jobs)
+ .build_global()
+ .expect("Failed to build thread pool");
+ }
+
+ let paths: Vec<String> = matches
+ .get_many::<String>("path")
+ .expect("Failed to get path")
+ .cloned()
+ .collect();
+
+ let files_to_process: Vec<PathBuf> = paths
+ .into_iter()
+ .flat_map(|path_str| {
+ let path = PathBuf::from(&path_str);
+ if path.is_dir() {
+ WalkDir::new(path)
+ .into_iter()
+ .filter_map(Result::ok)
+ .filter(|entry| is_supported_audio_file(entry.path()))
+ .map(|entry| entry.path().to_path_buf())
+ .collect()
+ } else if path.is_file() {
+ vec![path]
+ } else {
+ vec![]
+ }
+ })
+ .collect();
+
+ let (results, errors): (Vec<_>, Vec<_>) = files_to_process
+ .par_iter()
+ .map(|path| {
+ process_file(path, write_tags, force).map_err(|reason| TrackError {
+ path: path.clone(),
+ reason,
+ })
+ })
+ .partition(Result::is_ok);
+
+ let results: Vec<_> = results.into_iter().map(|r| r.unwrap()).collect();
+ let errors: Vec<_> = errors.into_iter().map(|r| r.unwrap_err()).collect();
+
+ if generate_report {
+ write_report(&results, &errors)?;
+ }
+
+ Ok(())
+}
diff --git a/src/types.rs b/src/types.rs
@@ -0,0 +1,18 @@
+use std::path::PathBuf;
+
+#[derive(Debug)]
+pub struct TrackInfo {
+ pub path: PathBuf,
+ pub artist: Option<String>,
+ pub album: Option<String>,
+ pub track: Option<String>,
+ pub label: Option<String>,
+ pub bpm: f32,
+ pub key: String,
+}
+
+#[derive(Debug)]
+pub struct TrackError {
+ pub path: PathBuf,
+ pub reason: String,
+}
