gstaudiomixerutils
#include <gst/audio/mixerutils.h>
gboolean (*GstAudioMixerFilterFunc) (GstMixer *mixer, gpointer user_data);
GstMixer *mixer
gpointer user_data
GList * gst_audio_default_registry_mixer_filter (GstAudioMixerFilterFunc filter_func, gboolean first, gpointer user_data);
GstAudioMixerFilterFunc filter_func
gboolean first