audiodynamic

This element can act as a compressor or expander. A compressor changes the amplitude of all samples above a specific threshold with a specific ratio, a expander does the same for all samples below a specific threshold. If soft-knee mode is selected the ratio is applied smoothly.

Example launch line

 gst-launch-1.0 audiotestsrc wave=saw ! audiodynamic characteristics=soft-knee mode=compressor threshold=0.5 ratio=0.5 ! alsasink
 gst-launch-1.0 filesrc location="melo1.ogg" ! oggdemux ! vorbisdec ! audioconvert ! audiodynamic characteristics=hard-knee mode=expander threshold=0.2 ratio=4.0 ! alsasink
 gst-launch-1.0 audiotestsrc wave=saw ! audioconvert ! audiodynamic ! audioconvert ! alsasink

Hierarchy

GObject
    ╰──GInitiallyUnowned
        ╰──GstObject
            ╰──GstElement
                ╰──GstBaseTransform
                    ╰──GstAudioFilter
                        ╰──audiodynamic

Factory details

Authors: – Sebastian Dröge

Classification: – Filter/Effect/Audio

Rank – none

Plugin – audiofx

Package – GStreamer Good Plug-ins

Pad Templates

sink

audio/x-raw:
         format: { S16LE, F32LE }
           rate: [ 1, 2147483647 ]
       channels: [ 1, 2147483647 ]
         layout: { (string)interleaved, (string)non-interleaved }

Presence – always

Direction – sink

Object type – GstPad

src

audio/x-raw:
         format: { S16LE, F32LE }
           rate: [ 1, 2147483647 ]
       channels: [ 1, 2147483647 ]
         layout: { (string)interleaved, (string)non-interleaved }

Presence – always

Direction – src

Object type – GstPad

Properties

characteristics 

“characteristics” Audio-dynamic-characteristics *

Selects whether the ratio should be applied smooth (soft-knee) or hard (hard-knee).

Flags : Read / Write

Default value : hard-knee (0)

mode 

“mode” Audio-dynamic-mode *

Selects whether the filter should work on loud samples (compressor) orquiet samples (expander).

Flags : Read / Write

Default value : compressor (0)

ratio 

“ratio” gfloat

Ratio that should be applied

Flags : Read / Write

Default value : 1

threshold 

“threshold” gfloat

Threshold until the filter is activated

Flags : Read / Write

Default value : 0

Named constants

Audio-dynamic-characteristics

Members

hard-knee (0) – Hard Knee (default)
soft-knee (1) – Soft Knee (smooth)

Audio-dynamic-mode

Members

compressor (0) – Compressor (default)
expander (1) – Expander

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