Sets the custom slaving callback. This callback will
be invoked if the slave-method property is set to
GST_AUDIO_BASE_SINK_SLAVE_CUSTOM and the audio sink
receives and plays samples.
Setting the callback to NULL causes the sink to
behave as if the GST_AUDIO_BASE_SINK_SLAVE_NONE
method were used.
Sets the custom slaving callback. This callback will be invoked if the slave-method property is set to GST_AUDIO_BASE_SINK_SLAVE_CUSTOM and the audio sink receives and plays samples.
Setting the callback to NULL causes the sink to behave as if the GST_AUDIO_BASE_SINK_SLAVE_NONE method were used.