Jasny Audio

Process audio files using SoX

Waveform

With the Jasny\Audio\Waveform class you can create a waveform as PNG like:

$waveform = new Waveform($filename, $options);
$waveform->output();

Alternatively you can request a set of samples. This can be used to set draw a waveform in JavaScript (see waveform.js).

Options

option	default	unit	description
width	1800	pixels	Image width
height	280	pixels	Image height
color	000000	hex or rgba	Color of the graph
axis	null	hex or rgba	Color of the x axis
level	null		The max amplitute (y axis)
offset	null	seconds	Starting point. Negative counts from end
duration	null	seconds	Duration of the track of chart

Track statistics

$track = new Track($filename);
$track->getStats();

{
    channels: "1",
    dc_offset: "0.000016",
    min_level: "-0.162134",
    max_level: "0.153157",
    pk_lev: "-15.80",
    rms_lev: "-33.56",
    rms_pk: "-24.31",
    rms_tr: "-55.44",
    crest_factor: "7.72",
    flat_factor: "0.00",
    pk_count: "2",
    bit_depth: "30/32",
    length: "1.935601",
    scale_max: "1.000000",
    window: "0.050",
    samples: "42680",
    scaled_by: "2147483647.0",
    maximum_amplitude: "0.153157",
    minimum_amplitude: "-0.162134",
    midline_amplitude: "-0.004489",
    mean_norm: "0.010709",
    mean_amplitude: "0.000016",
    rms_amplitude: "0.020990",
    maximum_delta: "0.115579",
    minimum_delta: "0.000000",
    mean_delta: "0.003656",
    rms_delta: "0.008325",
    rough_frequency: "1391",
    volume_adjustment: "6.168",
    sample_rate: "22050"
}

Convert track

Convert a track to a different format. Uses avconv (or ffmpeg).

$track = new Track("sometrack.wav");
$track->convert("sometrack.mp3");

Combine tracks

Combine two tracks. Uses sox --combine.

Available methods

• concatenate
• merge
• mix
• mix-power
• multiply
• sequence

$track = new Track($track1);
$track->combine($method, $track2, $outputFilename);