AudioContextOptions.sampleRate - Web APIs
the audiocontextoptions dictionary (used when instantiating an audiocontext) may contain a property named samplerate, which indicates the sample rate to use for the new context.
... the value must be a floating-point value indicating the sample rate, in samples per second, for which to configure the new context; additionally, the value must be one which is supported by audiobuffer.samplerate.
... syntax audiocontextoptions.samplerate = 44100; var samplerate = audiocontextoptions.samplerate; value the desired sample rate for the audiocontext, specified in samples per second.
...And 3 more matches

MediaTrackSettings.sampleRate - Web APIs
the mediatracksettings dictionary's samplerate property is an integer indicating how many audio samples per second the mediastreamtrack is currently configured for.
... this lets you determine what value was selected to comply with your specified constraints for this property's value as described in the mediatrackconstraints.samplerate property you provided when calling either getusermedia() or mediastreamtrack.applyconstraints().
... if needed, you can determine whether or not this constraint is supported by checking the value of mediatracksupportedconstraints.samplerate as returned by a call to mediadevices.getsupportedconstraints().
...And 2 more matches

AudioBuffer.sampleRate - Web APIs
the samplerate property of the audiobuffer interface returns a float representing the sample rate, in samples per second, of the pcm data stored in the buffer.
... syntax var myarraybuffer = audioctx.createbuffer(2, framecount, audioctx.samplerate); myarraybuffer.samplerate; value a floating-point value indicating the current sample rate of the buffers data, in samples per second.
... example // stereo var channels = 2; // create an empty two second stereo buffer at the // sample rate of the audiocontext var framecount = audioctx.samplerate * 2.0; var myarraybuffer = audioctx.createbuffer(2, framecount, audioctx.samplerate); button.onclick = function() { // fill the buffer with white noise; // just random values between -1.0 and 1.0 for (var channel = 0; channel < channels; channel++) { // this gives us the actual arraybuffer that contains the data var nowbuffering = myarraybuffer.getchanneldata(channel); for (var i = 0; i < framecount; i++) { // math.random() is in [0; 1.0] // audio needs to be in [-1.0; 1.0] nowbuffering[i] = math.random() * 2 - 1; } } console.log(myarraybuffer.samplerate); } specification specificati...
...on status comment web audio apithe definition of 'samplerate' in that specification.

BaseAudioContext.sampleRate - Web APIs
the samplerate property of the baseaudiocontext interface returns a floating point number representing the sample rate, in samples per second, used by all nodes in this audio context.
... syntax baseaudiocontext.samplerate; value a floating point number indicating the audio context's sample rate, in samples per second.
...try entering audioctx.samplerate into your browser console.
... console.log(audioctx.samplerate); specifications specification status comment web audio apithe definition of 'samplerate' in that specification.

MediaTrackConstraints.sampleRate - Web APIs
the mediatrackconstraints dictionary's samplerate property is a constrainlong describing the requested or mandatory constraints placed upon the value of the samplerate constrainable property.
... if needed, you can determine whether or not this constraint is supported by checking the value of mediatracksupportedconstraints.samplerate as returned by a call to mediadevices.getsupportedconstraints().
... syntax var constraintsobject = { samplerate: constraint }; constraintsobject.samplerate = constraint; value if this value is a number, the user agent will attempt to obtain media whose sample rate is as close as possible to this number given the capabilities of the hardware and the other constraints specified.
... specifications specification status comment media capture and streamsthe definition of 'samplerate' in that specification.

MediaTrackSupportedConstraints.sampleRate - Web APIs
the mediatracksupportedconstraints dictionary's samplerate property is a read-only boolean value which is present (and set to true) in the object returned by mediadevices.getsupportedconstraints() if and only if the user agent supports the samplerate constraint.
... syntax samplerateconstraintsupported = supportedconstraintsdictionary.samplerate; value this property is present in the dictionary (and its value is always true) if the user agent supports the samplerate constraint.
... example html content <div id="result"> </div> css content #result { font: 14px "arial", sans-serif; } javascript content let result = document.getelementbyid("result"); if (navigator.mediadevices.getsupportedconstraints().samplerate) { result.innerhtml = "supported!"; } else { result.innerhtml = "not supported!"; } result specifications specification status comment media capture and streamsthe definition of 'samplerate' in that specification.

Index - Web APIs
111 audiobuffer.samplerate api, audiobuffer, property, reference, web audio api, samplerate a floating-point value indicating the current sample rate of the buffers data, in samples per second.
... 137 audiocontextoptions api, audio, audiocontext, audiocontextoptions, configuration, context, dictionary, interface, options, reference, settings, web audio api, samplerate the audiocontextoptions dictionary is used to specify configuration options when constructing a new audiocontext object to represent a graph of web audio nodes.
... 139 audiocontextoptions.samplerate api, audio, audiocontext, audiocontextoptions, dictionary, interface, media, options, reference, sample rate, web audio, web audio api, samplerate the audiocontextoptions dictionary (used when instantiating an audiocontext) may contain a property named samplerate, which indicates the sample rate to use for the new context.
...And 5 more matches

Introducing the Audio API extension - Archive of obsolete content
this event has the following attributes: mozchannels: number of channels mozsamplerate: sample rate per second mozframebufferlength: number of samples collected in all channels this information is needed later to decode the audio data stream.
...tracts the data from an audio element: <!doctype html> <html> <head> <title>javascript metadata example</title> </head> <body> <audio id="audio-element" src="song.ogg" controls="true" style="width: 512px;"> </audio> <script> function loadedmetadata() { channels = audio.mozchannels; rate = audio.mozsamplerate; framebufferlength = audio.mozframebufferlength; } var audio = document.getelementbyid('audio-element'); audio.addeventlistener('loadedmetadata', loadedmetadata, false); </script> </body> </html> the mozaudioavailable event as the audio is played, sample data is made available to the audio layer and the audio buffer (size defined in mozframebufferlength) gets f...
...ent: <!doctype html> <html> <head> <title>javascript visualization example</title> </head> <body> <audio id="audio-element" src="revolve.ogg" controls="true" style="width: 512px;"> </audio> <pre id="raw">hello</pre> <script> function loadedmetadata() { channels = audio.mozchannels; rate = audio.mozsamplerate; framebufferlength = audio.mozframebufferlength; } function audioavailable(event) { var framebuffer = event.framebuffer; var t = event.time; var text = "samples at: " + t + "\n"; text += framebuffer[0] + " " + framebuffer[1]; raw.innerhtml = text; } var raw = document.getelementbyid('raw'); var audio = document...
...And 3 more matches

BaseAudioContext.createBuffer() - Web APIs
syntax var buffer = baseaudiocontext.createbuffer(numofchannels, length, samplerate); parameters note: for an in-depth explanation of how audio buffers work, and what these parameters mean, read audio buffers: frames, samples and channels from our basic concepts guide.
...to determine the length to use for a specific number of seconds of audio, use numseconds * samplerate.
... samplerate the sample rate of the linear audio data in sample-frames per second.
...And 2 more matches

OfflineAudioContext.OfflineAudioContext() - Web APIs
syntax var offlineaudioctx = new offlineaudiocontext(numberofchannels, length, samplerate); var offlineaudioctx = new offlineaudiocontext(options); parameters you can specify the parameters for the offlineaudiocontext() constructor as either the same set of parameters as are inputs into the audiocontext.createbuffer() method, or by passing those parameters in an options object.
...for example, a 5-second buffer with a samplerate of 48000hz would have a length of 5 * 48000 = 240000 sample-frames.
... samplerate the sample-rate of the linear audio data in sample-frames per second.
... example const offlinectx = new offlineaudiocontext({ numberofchannels: 2, length: 44100 * 40, samplerate: 44100, }); const source = offlinectx.createbuffersource(); // etc...

Creating a Web based tone generator - Archive of obsolete content
<!doctype html> <html> <head> <title>javascript audio write example</title> </head> <body> <input type="text" size="4" id="freq" value="440"><label for="hz">hz</label> <button onclick="start()">play</button> <button onclick="stop()">stop</button> <script type="text/javascript"> function audiodatadestination(samplerate, readfn) { // initialize the audio output.
... var audio = new audio(); audio.mozsetup(1, samplerate); var currentwriteposition = 0; var prebuffersize = samplerate / 2; // buffer 500ms var tail = null; // the function called with regular interval to populate // the audio output buffer.
... var frequency = 0, currentsoundsample; var samplerate = 44100; function requestsounddata(sounddata) { if (!frequency) { return; // no sound selected } var k = 2* math.pi * frequency / samplerate; for (var i=0, size=sounddata.length; i<size; i++) { sounddata[i] = math.sin(k * currentsoundsample++); } } var audiodestination = new audiodatadestination(samplerate, requestso...

AudioBuffer() - Web APIs
to determine the length to use for a specific number of seconds of audio, use numseconds * samplerate.
... samplerate: the sample rate in hz for the buffer.
... exceptions notsupportederror one or more of the options are negative or otherwise has an invalid value (such as numberofchannels being higher than supported, or a samplerate outside the nominal range).

AudioContext() - Web APIs
samplerate optional the samplerate to be used by the audiocontext, specified in samples per second.
... exceptions notsupportederror the specified samplerate isn't supported by the context.
... var audiocontext = window.audiocontext || window.webkitaudiocontext; var audioctx = new audiocontext({ latencyhint: 'interactive', samplerate: 44100, }); specifications specification status comment web audio apithe definition of 'audiocontext()' in that specification.

Visualizing an audio spectrum - Archive of obsolete content
idth: 512px;"> </audio> <div><canvas id="fft" width="512" height="200"></canvas></div> <script> var canvas = document.getelementbyid('fft'), ctx = canvas.getcontext('2d'), channels, rate, framebufferlength, fft; function loadedmetadata() { channels = audio.mozchannels; rate = audio.mozsamplerate; framebufferlength = audio.mozframebufferlength; fft = new fft(framebufferlength / channels, rate); } function audioavailable(event) { var fb = event.framebuffer, t = event.time, /* unused, but it's there */ signal = new float32array(fb.length / channels), magnitude; for (var i = 0, fbl = framebufferlength / 2; i ...
...aw rectangle bars for each frequency bin ctx.fillrect(i * 4, canvas.height, 3, -magnitude); } } var audio = document.getelementbyid('audio-element'); audio.addeventlistener('mozaudioavailable', audioavailable, false); audio.addeventlistener('loadedmetadata', loadedmetadata, false); // fft from dsp.js, see below var fft = function(buffersize, samplerate) { this.buffersize = buffersize; this.samplerate = samplerate; this.spectrum = new float32array(buffersize/2); this.real = new float32array(buffersize); this.imag = new float32array(buffersize); this.reversetable = new uint32array(buffersize); this.sintable = new float32array(buffersize); this.costable ...

AudioBuffer.duration - Web APIs
syntax var myarraybuffer = audioctx.createbuffer(2, framecount, audioctx.samplerate); myarraybuffer.duration; value a double.
... example // stereo var channels = 2; // create an empty two second stereo buffer at the // sample rate of the audiocontext var framecount = audioctx.samplerate * 2.0; var myarraybuffer = audioctx.createbuffer(2, framecount, audioctx.samplerate); button.onclick = function() { // fill the buffer with white noise; // just random values between -1.0 and 1.0 for (var channel = 0; channel < channels; channel++) { // this gives us the actual arraybuffer that contains the data var nowbuffering = myarraybuffer.getchanneldata(channel); for (var i = 0; i < framecount; i++) { // math.random() is in [0; 1.0] // audio needs to be in [-1.0; 1.0] nowbuffering[i] = math.random() * 2 - 1; } } console.log(myarraybuffer.duration); } specification specificatio...