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.

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;
  ];
]}]