oximedia-audio-analysis 0.1.0

Audio analysis tools for media including loudness, spectrum, and speech detection
Documentation 
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//! Harmonic analysis for music.

use crate::{AnalysisConfig, Result};

/// Harmony analyzer for detecting chords and progressions.
pub struct HarmonyAnalyzer {
    #[allow(dead_code)]
    config: AnalysisConfig,
}

impl HarmonyAnalyzer {
    /// Create a new harmony analyzer.
    #[must_use]
    pub fn new(config: AnalysisConfig) -> Self {
        Self { config }
    }

    /// Analyze harmonic content.
    pub fn analyze(&self, _samples: &[f32], _sample_rate: f32) -> Result<HarmonyResult> {
        // Placeholder implementation
        // In a full implementation, this would:
        // 1. Extract pitch class profile (chroma features)
        // 2. Detect chords using template matching
        // 3. Analyze chord progressions
        // 4. Detect key changes

        Ok(HarmonyResult {
            key: "C major".to_string(),
            chords: vec![],
            harmonic_complexity: 0.0,
        })
    }
}

/// Harmony analysis result.
#[derive(Debug, Clone)]
pub struct HarmonyResult {
    /// Detected musical key
    pub key: String,
    /// Detected chord sequence
    pub chords: Vec<String>,
    /// Harmonic complexity measure (0-1)
    pub harmonic_complexity: f32,
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_harmony_analyzer() {
        let config = AnalysisConfig::default();
        let analyzer = HarmonyAnalyzer::new(config);

        let samples = vec![0.1; 4096];
        let result = analyzer.analyze(&samples, 44100.0);
        assert!(result.is_ok());
    }
}