This is a bugfix release that is API and ABI compatible with previous
0.3.x releases.

Highlights

• Improved compatibility for flatpaks. Flatpaks with newer PipeWire
  version can connect to an older server in all cases.
• A new RAOP module was added to stream to Apple Airplay devices.
• OBS can now capture from the monitor devices again when using
  WirePlumber.
• Improved JACK compatibility. Improved stability in Carla and Ardour
  when changing buffer size. Improved latency calculations and
  playback latency in Ardour.
• Improved pulse-server handling of underruns and buffer size changes.
• Many bugfixes and improvements.

PipeWire

• The systemd service files now have better names.
• client.access permission checks are improved.
• Fix some memory leaks in error paths.
• Objects now have a global serial number that is unique for the
  lifetime of the server.
• Make clock.rate, clock.allowed-rates and clock.quantum
  runtime tunable parameters with the settings metadata.
• Add some additional memory checks in client-node to avoid
  sending invalid memory to clients. (Improve buffer memory allocation. If one of the nodes is a
  remote node, ensure we only use memory that can be shared.
• Version checks when binding to objects is removed. This means
  that newer clients can now bind to older servers, which is
  a typical case for a flatpak.
• A bug in the latency calculations was fixed where it would in
  some cases report the wrong minumum latency.

modules

• module-echo-cancel has voice-detection enabled now.
• module-raop-sink and module-raop-discover to stream audio to
  an Apple Airplay device.
• module-filter-chain now has preliminary support for LV2
  plugins.

SPA

• The audio resampler now has improved buffer size calculations.
  In some cases it was too small and would cause distortions.
• More checks are done when doing volume changes so that the
  channelmap is correct.
• Audioadapter now exposes most config options with params so that
  they can be adjusted at runtime.
• The resampler can now calculate the expected input buffer size
  before receiving the first buffer, which avoids some confusion
  when starting streams.
• Support was added for some 10bit video formats.
• MONO channel handling was improved.
• Most plugins now set a clock name and this is configurable where
  it makes sense. The clock.system.monotonic clock name is used
  for most plugins that use the system clock for timing.

pulse-server

• implement module-raop-discover
• Use STREAM_CAPTURE_SINK property when capturing from a monitor
  source to better inform the session manager. This fixes some
  issues where OBS would capture from the microphone instead of
  the output monitor.
• Limit the amount of cache messages to 16MB and don’t add large
  memory blocks to the cache. This should fix some excessive
  memory usage that people reported.
• Fix a potential memory leak when cleaning up a client.
• Do some additional checks to avoid buffer overruns.
• Improve recovery from underruns better. (#1857) This improves
  seeking in gnome-music.
• Improve recovery when the quantum is forced larger that the
  stream configured latency.
• The prebuf state is now handled correctly.

JACK

• A per type object cache is now implemented. This ensures that
  port objects remain valid for a longer time because many
  JACK applications inspect objects after they are destroyed.
  This improves catia/carla compatibility.
• Recompute the latencies when the buffer-size changes. Fix some
  cases where we would end up with negative latencies.
• Handle regcomp errors to avoid some crashes later.
• Latency calculations are improved a lot.
• More care is taken to not call a process callback while a buffer
  size change is pending. This fixes some crashes in Carla, which
  expect that all clients are paused when one handles the buffersize
  callback.
• Loopback links to a client are now handled correctly and without
  latency. This fixes playback latency in ardour6 (#1839)

ALSA

• ALSA devices now keep track of the samplerate of the card and
  ensure that all PCM use the same rate. This is a workaround for
  a kernel bug that is fixed in 5.16.
• Refactor the ALSA plugin a little.
• The ALSA plugin now reports correct delay for a capture PCM. (#1697)
• The ALSA nodes now expose all config options with params that can be
  changed at runtime.
• The ALSA node has a configurable clock name. Adaptive resampling to
  match clock rates is avoided when the driver has the same clock
  name as the ALSA node. This can be used to link alsa devices toge