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GStreamer Good Plugins 0.10 Plugins Reference Manual | |
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| Top | Description | Object Hierarchy | Implemented Interfaces | Properties | ||||
GObject
+----GstObject
+----GstElement
+----GstBaseTransform
+----GstAudioFilter
+----GstIirEqualizer
+----GstIirEqualizerNBands
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.
gst-launch filesrc location=song.ogg ! oggdemux ! vorbisdec ! audioconvert ! equalizer-nbands num-bands=15 band5::gain=6.0 ! alsasink
#include <gst/gst.h>
...
typedef struct {
gfloat freq;
gfloat width;
gfloat gain;
} GstEqualizerBandState;
...
GstElement *equalizer;
GstObject *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));
}
...