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GStreamer Good Plugins 0.10 Plugins Reference Manual | ![]() |
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Top | Description | Object Hierarchy | Properties |
GObject +----GstObject +----GstElement +----GstBaseTransform +----GstAudioFilter +----GstAudioFXBaseFIRFilter +----GstAudioWSincLimit
"frequency" gdouble : Read / Write "length" gint : Read / Write "mode" GstAudioWSincLimitMode : Read / Write "window" GstAudioWSincLimitWindow : Read / Write "cutoff" gfloat : Read / Write
Attenuates all frequencies above the cutoff frequency (low-pass) or all frequencies below the cutoff frequency (high-pass). The length parameter controls the rolloff, the window parameter controls rolloff and stopband attenuation. The Hamming window provides a faster rolloff but a bit worse stopband attenuation, the other way around for the Blackman window.
This element has the advantage over the Chebyshev lowpass and highpass filter that it has a much better rolloff when using a larger kernel size and almost linear phase. The only disadvantage is the much slower execution time with larger kernels.
gst-launch audiotestsrc freq=1500 ! audioconvert ! audiowsinclimit mode=low-pass frequency=1000 length=501 ! audioconvert ! alsasink gst-launch filesrc location="melo1.ogg" ! oggdemux ! vorbisdec ! audioconvert ! audiowsinclimit mode=high-pass frequency=15000 length=501 ! audioconvert ! alsasink gst-launch audiotestsrc wave=white-noise ! audioconvert ! audiowsinclimit mode=low-pass frequency=1000 length=10001 window=blackman ! audioconvert ! alsasink
plugin |
audiofx |
author |
Thomas Vander Stichele <thomas at apestaart dot org>, Steven W. Smith, Dreamlab Technologies Ltd. <mathis.hofer@dreamlab.net>, Sebastian Dröge <sebastian.droege@collabora.co.uk> |
class |
Filter/Effect/Audio |
name |
sink |
direction |
sink |
presence |
always |
details |
audio/x-raw-float, width=(int){ 32, 64 }, endianness=(int)1234, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ] |
name |
src |
direction |
source |
presence |
always |
details |
audio/x-raw-float, width=(int){ 32, 64 }, endianness=(int)1234, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ] |
"frequency"
property"frequency" gdouble : Read / Write
Cut-off Frequency (Hz).
Allowed values: >= 0
Default value: 0
"length"
property"length" gint : Read / Write
Filter kernel length, will be rounded to the next odd number.
Allowed values: [3,256000]
Default value: 101
"mode"
property "mode" GstAudioWSincLimitMode : Read / Write
Low pass or high pass mode.
Default value: Low pass (default)
"window"
property "window" GstAudioWSincLimitWindow : Read / Write
Window function to use.
Default value: Hamming window (default)
"cutoff"
property"cutoff" gfloat : Read / Write
Cut-off Frequency (Hz).
Allowed values: [0,100000]
Default value: 0