API

Audio

Root semantic audio values and codecs plus the C++-parity FnAudio signal-processing family.

Compiler-extracted public headersNative C++ surface24 functions15 classes2 enums0 constants & variables

This inventory is extracted from OA public headers by clang-doc. Native types, pointers, references, defaults, public inheritance, comments and source ownership come from the compiler surface.

Examples

ExAudio

Load the OA narration, convert it to mono, normalize it, render a native GPU reverberation tail, then save a checked WAV output.

Audio

Functions

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Channel layout → expected channel count (0 = unknown layout).

Source

Best-effort layout for a raw channel count. Three channels remain unknown: channel count alone cannot distinguish L/R/LFE (2.1) from L/C/R (3.0).

Classes

12 members

─── Audio ─────────────────────────────────────────────────────────────────── Semantic planar float32 audio value composed over oa::Matrix. The matrix view is [channels, samples]; sample rate and layout stay attached to that storage.

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constructor

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Examples

ExexAudio.cppLoad the OA narration, convert it to mono, normalize it, render a native GPU reverberation tail, then save a checked WAV output.

9 members

constructor

Stops callback delivery and releases the device. This is the explicit, result-bearing completion boundary.

method

static

Non-blocking. Returns false when no complete captured frames are ready.

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Source

0 members

oa::U32

oa::U64

Vector

oa::U64

oa::U32

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0 members

oa::U32

Source

0 members

oa::U32

AudioCodec

oa::U32

Source

10 members

constructor

Discards any unflushed partial packet and closes the session.

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static

method

Source

17 members

constructor

method

Stops playback, joins decoding, and releases codec/device state.

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static

method

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0 members

bool

oa::U32

String

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0 members

─── Biquad Coefficients ───────────────────────────────────────────────────── Real, a0-normalized coefficients for y[n] = b0*x[n] + b1*x[n-1] + b2*x[n-2] - a1*y[n-1] - a2*y[n-2]. biquad() applies each channel independently with zero initial state.

oa::F32

Source

0 members

Vector

oa::U32

oa::I64

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0 members

─── Mel Spectrogram Configuration ────────────────────────────────────────────

oa::U32

oa::F32

oa::U32

bool

oa::U32

Source

0 members

─── MFCC Configuration ───────────────────────────────────────────────────────

MelConfig

oa::U32

Source

0 members

─── Audio Normalization Configuration ────────────────────────────────────────

oa::U8

oa::F32

Source

0 members

─── Resample Configuration ───────────────────────────────────────────────────

oa::U32

Source

0 members

─── STFT Configuration ───────────────────────────────────────────────────────

bool

oa::U32

oa::U8

oa::U32

Source

Enums

Source

─── ChannelLayout ────────────────────────────────────────────────────────────

Mono · Stereo · Stereo21 · Surround51 · Surround71 · Unknown

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Encoded audio formats owned by OA. Keep this independent from containers: the same elementary stream can be written to MP4, Matroska or a raw sink.

PcmS16

Functions

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amplitudeToDb: Convert waveform amplitude to a finite dB matrix with a silence floor.

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biquad: Apply one stable a0-normalized biquad independently per channel with zero initial state.

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clip: Clamp waveform samples to a finite range while preserving audio metadata.

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Stateless CPU codec boundaries. Decode uploads planar Float32 storage through the active engine. encoding is an explicit synchronous host boundary; the semantic overload completes and reads back its input.

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fade: Apply linear fade-in and fade-out envelopes measured in samples.

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gain: Apply scalar gain in dB while preserving audio metadata.

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melSpectrogram: Mel feature matrix in [Channels, NumMels, Frames] layout.

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mfcc: Orthonormal DCT-II coefficients of the log-mel feature matrix.

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mix: Weighted sum of two audio values with identical rate, layout, shape, and dtype.

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normalize: Peak or RMS normalization to a target dB level while preserving audio metadata.

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preEmphasis: Apply y[n] = x[n] - alpha*x[n-1] while preserving audio metadata.

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resample: Windowed-sinc resampling with sample rate derived from the input audio value.

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reverb: Render a finite zero-state Schroeder reverberation tail with decay time in seconds and a dry/wet mix.

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saturate: Apply a tanh soft-clipping waveshaper with drive in dB and a dry/wet mix.

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sosFilter: Apply one to 64 stable a0-normalized second-order sections as a zero-state cascade.

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stft: Short-time Fourier magnitude transform to [Channels, Frames, Bins].

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toMono: Average channels into one mono channel while retaining the sample rate.

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waveformEnvelope: Reduce multichannel audio to a peak-preserving min/max display matrix.

Examples

Audio

Functions

Classes

Enums

FnAudioFnAudio

Functions