Module pcm 

Interleaved 16-bit PCM with the measurements pydub exposes.

Every formula here is pydub’s, which is audioop’s underneath, and the integer truncation is load-bearing: rms is an int, so dBFS is the log of a rounded-down value, not of the true RMS. Reproducing the rounding matters more than being more accurate.

Structs

Pcm

Interleaved i16 samples plus the format they were decoded at.

Constants

MAX_POSSIBLE_AMPLITUDE

Sample width is always 2 in this pipeline; pydub’s max_possible_amplitude is 2^16 / 2.

Functions

py_round 🔒

Python’s round() — half away from zero is not what it does; it is banker’s rounding, so 0.5 goes to 0 and 1.5 goes to 2.

ratio_to_db

pydub.utils.ratio_to_db in amplitude mode, -inf at zero. See crate::segment::ratio_to_db for why this is not log10.