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GStreamer Base Plugins 0.10 Library Reference Manual | |
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#include <gst/audio/gstaudiofilter.h>
GstAudioFilter;
GstAudioFilterClass;
void gst_audio_filter_class_add_pad_templates
(GstAudioFilterClass *klass,
const GstCaps *allowed_caps);
GstAudioFilter is a GstBaseTransform-derived base class for simple audio filters, ie. those that output the same format that they get as input.
GstAudioFilter will parse the input format for you (with error checking)
before calling your setup function. Also, elements deriving from
GstAudioFilter may use gst_audio_filter_class_add_pad_templates() from
their base_init function to easily configure the set of caps/formats that
the element is able to handle.
Derived classes should override the GstAudioFilterClass.setup() and
GstBaseTransformClass.transform_ip() and/or
GstBaseTransformClass.transform()
virtual functions in their class_init function.
Last reviewed on 2007-02-03 (0.10.11.1)
typedef struct _GstAudioFilter GstAudioFilter;
Base class for audio filters with the same format for input and output.
Since 0.10.12
typedef struct {
GstBaseTransformClass basetransformclass;
/* virtual function, called whenever the format changes */
gboolean (*setup) (GstAudioFilter * filter, GstRingBufferSpec * format);
} GstAudioFilterClass;
In addition to the setup virtual function, you should also override the
GstBaseTransform::transform and/or GstBaseTransform::transform_ip virtual
function.
GstBaseTransformClass basetransformclass; |
parent class |
setup () |
virtual function called whenever the format changes |
Since 0.10.12
void gst_audio_filter_class_add_pad_templates
(GstAudioFilterClass *klass,
const GstCaps *allowed_caps);
Convenience function to add pad templates to this element class, with
allowed_caps as the caps that can be handled.
This function is usually used from within a GObject base_init function.
klass : |
an GstAudioFilterClass |
allowed_caps : |
what formats the filter can handle, as GstCaps |
Since 0.10.12