Module bpm 

BPM estimation via onset-strength autocorrelation.

Reads raw PCM data from WAV and AIFF files, computes an energy envelope, derives onset strength, then uses autocorrelation to find the dominant tempo in the 50–220 BPM range.

Functions

decode_pcm 🔒

Decode raw PCM bytes to mono f32 samples, normalized to [-1, 1].

decode_with_symphonia 🔒

Decode compressed audio (MP3, FLAC, OGG, M4A, AAC) via symphonia. Returns mono f32 samples + sample rate, or None on failure.

decode_with_symphonia_pub

detect_tempo 🔒

Detect tempo using onset-strength autocorrelation.

estimate_bpm

Estimate BPM for an audio file. Returns None for unsupported formats, unreadable files, or when no clear tempo is detected.

read_aiff_pcm 🔒

Read AIFF file and return mono f32 samples + sample rate.

read_aiff_pcm_pub

read_wav_pcm 🔒

Read WAV file and return mono f32 samples + sample rate.

read_wav_pcm_pub