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);