GstEnvelope — envelope helper object
GstEnvelope; GstEnvelope* gst_envelope_new (void);
Object with one controllable public gdouble variable /property (GstEnvelope:value).
typedef struct { GObject parent; /* parameters */ gdouble value; } GstEnvelope;
GstEnvelope* gst_envelope_new (void);
Create a new instance
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