pub unsafe extern "C" fn gst_buffer_get_audio_downmix_meta_for_channels(
buffer: *mut GstBuffer,
to_position: *const GstAudioChannelPosition,
to_channels: c_int,
) -> *mut GstAudioDownmixMeta
pub unsafe extern "C" fn gst_buffer_get_audio_downmix_meta_for_channels(
buffer: *mut GstBuffer,
to_position: *const GstAudioChannelPosition,
to_channels: c_int,
) -> *mut GstAudioDownmixMeta