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(channels: u32, length: usize, sample_rate: SampleRate) -> 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(&mut self) -> AudioBuffer

OfflineAudioContext doesn’t start rendering automatically You need to call this function to start the audio rendering

pub fn length(&self) -> usize

get the length of rendering audio buffer

Trait Implementations

impl AsBaseAudioContext for OfflineAudioContext

fn base(&self) -> &BaseAudioContext

retrieves the BaseAudioContext associated with the concrete AudioContext

fn decode_audio_data<R: Read + Send + '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: SampleRate
) -> 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_oscillator(&self) -> OscillatorNode

Creates an OscillatorNode, a source representing a periodic waveform. It basically generates a tone.

fn create_stereo_panner(&self) -> StereoPannerNode

Creates an StereoPannerNode to pan a stereo output

fn create_gain(&self) -> GainNode

Creates an GainNode, to control audio volume

fn create_constant_source(&self) -> ConstantSourceNode

Creates an ConstantSourceNode, a source representing a constant value

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

Creates an IirFilterNode

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

Creates a DelayNode, delaying the audio signal

fn create_biquad_filter(&self) -> BiquadFilterNode

Creates an BiquadFilterNode which implements a second order filter

fn create_wave_shaper(&self) -> WaveShaperNode

Creates a WaveShaperNode

fn create_channel_splitter(&self, number_of_outputs: u32) -> ChannelSplitterNode

Creates a ChannelSplitterNode

fn create_channel_merger(&self, number_of_inputs: u32) -> ChannelMergerNode

Creates a ChannelMergerNode

fn create_media_stream_source<M: MediaStream>(
    &self,
    media: M
) -> MediaStreamAudioSourceNode

Creates a MediaStreamAudioSourceNode from a MediaElement

fn create_media_element_source(
    &self,
    media: MediaElement
) -> MediaElementAudioSourceNode

Creates a MediaElementAudioSourceNode from a MediaElement

fn create_buffer_source(&self) -> AudioBufferSourceNode

Creates an AudioBufferSourceNode

fn create_panner(&self) -> PannerNode

Creates a PannerNode

fn create_analyser(&self) -> AnalyserNode

Creates a AnalyserNode

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

Creates a periodic wave

fn create_audio_param(
    &self,
    opts: AudioParamOptions,
    dest: &AudioNodeId
) -> (AudioParam, AudioParamId)

Create an AudioParam.

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 sample_rate_raw(&self) -> SampleRate

The raw sample rate of the AudioContext (which has more precision than the float sample_rate() value).

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.