Struct web_audio_api::context::OfflineAudioContext

pub struct OfflineAudioContext { /* private fields */ }

The OfflineAudioContext doesn’t render the audio to the device hardware; instead, it generates it, as fast as it can, and outputs the result to an AudioBuffer.

Implementations

impl OfflineAudioContext

pub fn new(number_of_channels: usize, length: usize, sample_rate: f32) -> Self

Creates an OfflineAudioContext instance

Arguments

• channels - number of output channels to render
• length - length of the rendering audio buffer
• sample_rate - output sample rate

pub fn start_rendering_sync(self) -> AudioBuffer

Given the current connections and scheduled changes, starts rendering audio.

This function will block the current thread and returns the rendered AudioBuffer synchronously. An async version is currently not implemented.

pub fn length(&self) -> usize

get the length of rendering audio buffer

Trait Implementations

impl BaseAudioContext for OfflineAudioContext

fn base(&self) -> &ConcreteBaseAudioContext

Returns the BaseAudioContext concrete type associated with this AudioContext

fn register<T: AudioNode, F: FnOnce(AudioContextRegistration) -> (T, Box<dyn AudioProcessor>)>(
    &self,
    f: F
) -> T

Construct a new pair of AudioNode and AudioProcessor

fn decode_audio_data_sync<R: Read + Send + Sync + 'static>(
    &self,
    input: R
) -> Result<AudioBuffer, Box<dyn Error + Send + Sync>>

Decode an AudioBuffer from a given input stream.

fn create_buffer(
    &self,
    number_of_channels: usize,
    length: usize,
    sample_rate: f32
) -> AudioBuffer

Create an new “in-memory” AudioBuffer with the given number of channels, length (i.e. number of samples per channel) and sample rate.

fn create_analyser(&self) -> AnalyserNode

Creates a AnalyserNode

fn create_biquad_filter(&self) -> BiquadFilterNode

Creates an BiquadFilterNode which implements a second order filter

fn create_buffer_source(&self) -> AudioBufferSourceNode

Creates an AudioBufferSourceNode

fn create_constant_source(&self) -> ConstantSourceNode

Creates an ConstantSourceNode, a source representing a constant value

fn create_convolver(&self) -> ConvolverNode

Creates an ConvolverNode, a processing node which applies linear convolution

fn create_channel_merger(&self, number_of_inputs: usize) -> ChannelMergerNode

Creates a ChannelMergerNode

fn create_channel_splitter(
    &self,
    number_of_outputs: usize
) -> ChannelSplitterNode

Creates a ChannelSplitterNode

fn create_delay(&self, max_delay_time: f64) -> DelayNode

Creates a DelayNode, delaying the audio signal

fn create_dynamics_compressor(&self) -> DynamicsCompressorNode

Creates a DynamicsCompressorNode, compressing the audio signal

fn create_gain(&self) -> GainNode

Creates an GainNode, to control audio volume

fn create_iir_filter(
    &self,
    feedforward: Vec<f64>,
    feedback: Vec<f64>
) -> IIRFilterNode

Creates an IirFilterNode

fn create_oscillator(&self) -> OscillatorNode

Creates an OscillatorNode, a source representing a periodic waveform.

fn create_panner(&self) -> PannerNode

Creates a PannerNode

fn create_periodic_wave(&self, options: PeriodicWaveOptions) -> PeriodicWave

Creates a periodic wave

fn create_stereo_panner(&self) -> StereoPannerNode

Creates an StereoPannerNode to pan a stereo output

fn create_wave_shaper(&self) -> WaveShaperNode

Creates a WaveShaperNode

fn destination(&self) -> AudioDestinationNode

Returns an AudioDestinationNode representing the final destination of all audio in the context. It can be thought of as the audio-rendering device.

fn listener(&self) -> AudioListener

Returns the AudioListener which is used for 3D spatialization

fn sample_rate(&self) -> f32

The sample rate (in sample-frames per second) at which the AudioContext handles audio.

fn state(&self) -> AudioContextState

Returns state of current context

fn current_time(&self) -> f64

This is the time in seconds of the sample frame immediately following the last sample-frame in the block of audio most recently processed by the context’s rendering graph.

fn create_audio_param(
    &self,
    opts: AudioParamDescriptor,
    dest: &AudioContextRegistration
) -> (AudioParam, AudioParamId)

Create an AudioParam.