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Object Hierarchy
GObject ╰── GInitiallyUnowned ╰── GstObject ╰── GstElement ╰── GstBaseTransform ╰── GstAudioFilter ╰── GstIirEqualizer ╰── GstIirEqualizerNBands
Description
The n-band equalizer element is a fully parametric equalizer. It allows to select between 1 and 64 bands and has properties on each band to change the center frequency, band width and gain.
Example launch line
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gst-launch-1.0 filesrc location=song.ogg ! oggdemux ! vorbisdec ! audioconvert ! equalizer-nbands num-bands=15 band5::gain=6.0 ! alsasink |
Example code
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#include <gst/gst.h> ... typedef struct { gfloat freq; gfloat width; gfloat gain; } GstEqualizerBandState; ... GstElement *equalizer; GObject *band; gint i; GstEqualizerBandState state[] = { { 120.0, 50.0, - 3.0}, { 500.0, 20.0, 12.0}, {1503.0, 2.0, -20.0}, {6000.0, 1000.0, 6.0}, {3000.0, 120.0, 2.0} }; ... equalizer = gst_element_factory_make ("equalizer-nbands", "equalizer"); g_object_set (G_OBJECT (equalizer), "num-bands", 5, NULL); ... for (i = 0; i < 5; i++) { band = gst_child_proxy_get_child_by_index (GST_CHILD_PROXY (equalizer), i); g_object_set (G_OBJECT (band), "freq", state[i].freq, "bandwidth", state[i].width, "gain", state[i].gain); g_object_unref (G_OBJECT (band)); } ... |
Synopsis
Element Information
plugin |
equalizer |
author |
Benjamin Otte <otte@gnome.org>, Stefan Kost <ensonic@users.sf.net> |
class |
Filter/Effect/Audio |
Element Pads
name |
sink |
direction |
sink |
presence |
always |
details |
audio/x-raw, format=(string){ S16LE, F32LE, F64LE }, rate=(int)[ 1000, 2147483647 ], channels=(int)[ 1, 2147483647 ], layout=(string)interleaved |
name |
src |
direction |
source |
presence |
always |
details |
audio/x-raw, format=(string){ S16LE, F32LE, F64LE }, rate=(int)[ 1000, 2147483647 ], channels=(int)[ 1, 2147483647 ], layout=(string)interleaved |
Property Details
The “num-bands” property
“num-bands” guint
number of different bands to use.
Flags: Read / Write / Construct
Allowed values: [1,64]
Default value: 10