| pa_buffer_attr | Playback and record buffer metrics |
| pa_channel_map | A channel map which can be used to attach labels to specific channels of a stream |
| pa_client_info | Stores information about clients |
| pa_cvolume | A structure encapsulating a per-channel volume |
| pa_mainloop_api | An abstract mainloop API vtable |
| pa_module_info | Stores information about modules |
| pa_sample_info | Stores information about sample cache entries |
| pa_sample_spec | A sample format and attribute specification |
| pa_server_info | Server information |
| pa_simple | An opaque simple connection object |
| pa_sink_info | Stores information about sinks |
| pa_sink_input_info | Stores information about sink inputs |
| pa_source_info | Stores information about sources |
| pa_source_output_info | Stores information about source outputs |
| pa_spawn_api | A structure for the spawn api |
| pa_stat_info | Memory block statistics |
| pa_timing_info | A structure for all kinds of timing information of a stream |
1.5.6