Struct Spectrogram 

pub struct Spectrogram { /* private fields */ }

The spectrogram of a passage.

Implementations

impl Spectrogram

pub fn of(samples: &[f64], rate: SampleRate) -> Self

Computes both panels of a mono signal.

The passage is the PASSAGE_S window that holds the most active 4096-point frames, the earliest on a tie, or the whole signal when it is shorter. 0 dB is the loudest bin above DC over the whole signal at the panel’s frame length, hop N / 4, so both panels share one scale up to the frame length’s resolution.

pub fn start(&self) -> Seconds

Returns the start of the passage.

pub fn span(&self) -> Seconds

Returns the length of the passage.

pub fn panels(&self) -> &[PanelDb]

Returns the panels, top first.

pub fn pixels(&self) -> Vec<u8>

Returns the RGB pixels, row by row, WIDTH by HEIGHT.

pub fn to_png(&self) -> Result<Vec<u8>, EncodingError>

Encodes the image as an 8-bit RGB PNG.

Errors

Returns a [png::EncodingError] if the encoder fails, which an in-memory buffer of the right size never causes.

Trait Implementations

impl Clone for Spectrogram

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Spectrogram

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl PartialEq for Spectrogram

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for Spectrogram