Audio

Audio[file] represents audio stored in the given file.

Audio[url] represents audio stored in the given URL.

Audio[data] represents audio with samples given by the array data.

Audio[data, format, opts] represents audio stored as format, where format:

• "SignedInteger8" - data must be an array of signed 8 bit values
• "SignedInteger16" - data must be an array of signed 16 bit values
• "Real32" - data is a floating point array from -1.0 to 1.0

Audio[SoundNote[...]] samples SoundNote into an audio

Audio[Video[...]] extracts audio track from video object

Any improted audio files are represented as Audio.

Options

SampleRate

Sets the sample rate of Audio object.

Examples

Create audio from a sine wave:

Audio[Table[Sin[440 * 2 Pi * t], {t, 0, 1, 1/44100}]]

Methods

See all Audio* symbols in this reference section.

Something isn't working? Report an issue.

Please visit the official Wolfram Language Reference for more details.

Updates and streaming

As many WLJS primitives Audio supports real-time streaming of data using Offload expression:

buffer = {};
Audio[buffer//Offload, "Real32"]

The following formats are supported for streaming:

• `"Real32", mono
• `"SignedInteger16", mono

with SampleRate option:

• 8000
• 16000
• 44100

To push a new chunk of data to the buffer - simply assign an array:

buffer = Table[Exp[-x/100.0]Sin[x/1.5], {x,0,100Pi, 0.1}];

You can assign an event handler to detect, when the buffer is about to be finished to push a new chunk of data:

buffer = {};
samplingFunction = Function[t, Exp[-Mod[t,3]/1.0]Sin[200.0 t]]; 
time = 0;

EventHandler[Audio[buffer//Offload, "Real32", SampleRate->8000], {"More" -> Function[Null,
  With[{c = (1.0/8000.0) (2Pi)},
    With[{sampled =  Table[samplingFunction[c (i + time)], {i, 0, 4 1024 - 1}]},
      buffer = NumericArray[sampled, "Real32"];
    ];
    
    time += 4 1024;
  ];
]}]