Fixes #1642

Add a pulse.latency option to override the default 100ms latency.

20ms is too small and might be a typo from the pulseaudio 200ms default
latency.

Fixes #1637

No point spamming the journal here.

This ensures the log messages show up with the right module name prefix

BlueZ 6 is planning to make most of libbluetooth private.  In
particular, the direct hci access is planned to be removed.  This is
currently used for determining adapter msbc support.

Instead of using libbluetooth API, try to determine msbc support by
a connect() attempt, which the kernel should reject when not supported.

Fixes #1638

Coverity scans the source code for static analysis, but its parser
has a couple of flaws...
The most common one is the failure to parse deprecation macros in
enum definitions, like:

```
  G_PARAM_PRIVATE GLIB_DEPRECATED_ENUMERATOR_IN_2_26 = G_PARAM_STATIC_NAME,
                  ^
  SD_JOURNAL_SYSTEM_ONLY _sd_deprecated_ = SD_JOURNAL_SYSTEM /* old name */
                         ^
```

but also recent gcc built-in macros, like:

```
  #if __has_builtin(__builtin_is_constant_evaluated)
      ^
  #if _GLIBCXX_HAS_BUILTIN(__has_unique_object_representations)
      ^
```

The solution is to replace the code with regular expressions at an earlier
stage. This can be configured directly in coverity with cov-configure

Peter Hutterer authored Sep 22, 2021 and Wim Taymans committed Sep 22, 2021

media-session is past the point of being a mere example, let's promote
it out of the subdirectory.

pw-reserve is moved to tools/

When building with -Dexamples=disabled, the whole src/examples is
skipped, so we never declare that variable.

Fixes #1551

Missing from some tests, superfluous in the other test because it was
already called in the test_log_levels() helper function

We can only log for a level below our current one if we are two above
NONE. And by the same instance, we don't expect NONE messages to show
up.

False positive, we abort in the cases where this isn't initialized.

Fixes e1672f97

Fixes #1486

As long as we are inactive, don't update our internal buffer_size or
sample rate. This way, when we become active, we will emit the right
callback with the right value instead of doing nothing.

Fixes crashes in Carla.

Boolean switches can also be true with 'y', 'yes', 't' and 'on'

The requests_ vector contains the requests created for a camera on start()
but the vector elements are not removed on camera stop(). This leads to a
segfault, when these requests that are no longer valid are queued again.

Also move the streamName_ map clear to LibCamera::stop() where it should
be, since its elements are added in the LibCamera::start() function.

The camera is connected in the spa_libcamera_stream_on() function but the
disconnect happen in LibCamera::stop(). It makes more sense to have this
two operations separated as it's done for the connection and start, since
the camera then can be stopped/started without needing to do a reconnect.

Move the camera disconnect to spa_libcamera_stream_off() for the reason
mentioned above but also to make the code more consistent and symmetric.

The libcamera application developer guide mentions that buffers allocated
by the FrameBufferAllocator must be explicitly freed before deleting it.

Camera is currently stopped and started in the spa_libcamera_set_format()
function, but this leads to a segfault due attempting to access a buffers
field of an already freed libcamera::FrameBufferAllocator instance.

The FrameBufferAllocator instance is freed in LibCamera::stop(), that is
called by spa_libcamera_stream_off() as handler of the node commands
SPA_NODE_COMMAND_Pause and SPA_NODE_COMMAND_Suspend.

Since the camera was already stopped, there's no need to attempt to stop
it again. In fact, the camera shouldn't be stopped/started at all in the
spa_libcamera_set_format() function but instead only as an action of the
SPA_NODE_COMMAND_{Pause,Suspend} and SPA_NODE_COMMAND_Start commands.

And same for the stop that's done in the LibCamera::close() function, it
shouldn't be needed because the camera is already stopped before closing.

Fixes #1513

There is no need to set and validate the configuration when the camera
is started, since this was already made when the camera was opened.

The configuration only needs to be set again if the port format changes
due a SPA_PARAM_Format parameter.

The libcamera wrapper provides a set of C functions that wraps libcamera's
C++ interface. But there isn't a function to call LibCamera::set_config().

Don't use the audio.channels and audio.rate settings influence the
passthrough formats.

See #93

This reverts commit f22dd9d7.

Obsolete now that pw_init and factory loading/unloading has been
made thread safe.

The handle might want to unload plugins and we thus need to release the
lock.

Simplify channel layout management a little.
Use the bitorder and interleaving to read and format the DSD in the
buffer.

And make alsa report the interleaving.