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bluez5: adapt to further BAP API changes in BlueZ

BlueZ master BAP API is changing, so match our code to that.

filter-chain: fix volume controls handling

Scale the volume with min/max values.

Actually set the softMute and softVolume to false/1.0 and proxy the mute
and channelVolumes as they are.

Don't do anything special when we don't have custom volume ports.

See #3434

meson: use major version in versions

To prepare for a major version update to 1 later.

module-raop: fix stray !

check if malloc_trim() is available

impl-node: do malloc_trim() after destroying a node.

Fixes #1840

audioconvert: warn -> debug

audioconvert: handle realloc errors

The original pointer is untouched when realloc fails and returns NULL so
make sure we free the previous values.

module-raop-sink: don't let mute change the volume

Use both the volume and mute to decide what volume to send.

Don't let the mute state overwrite the volume. Also never mute the
stream.

Pressing mute and unmute restores the previous volume this way.

module-raop-sink: Fix volume calculation

The volume interval that RAOP devices understand is [-30,0],
where -30.0 equals min vol, and 0.0 equals max. vol.

The local system volume is represented as a cubic (volumetric)
value in the [0,1] interval.

So cube root system volume value, scale by 30 and
translate -30 to map to target output range.

The special value -144 denotes volume mute. Send a corresponding RTSP
message when mute is not already toggled on.

pulse-server: module-echo-cancel: set `pulse.module.id`

Set `pulse.module.id` on every node that libpipewire-module-echo-cancel
creates so that one can see in the output of `pactl list {sinks,sources}`
which nodes were created by a particular instance of module-echo-cancel.

Fixes #3541

filter-chain: add nofail flags

Add nofail flags to some filter-chain examples to avoid aborting on
startup and leaving the system in a silent state.

Add some more comments to guide people to change the paths to the
filters and config files where needed.

filter-chain: add custom volume support

Add capture.volumes and playback.volumes to control the graph controls
that handle the capture and playback volume respectively.

See #3434

pw-cat: add DFF file suppport

audioadapter: always pass Start when passthrough

When we are operating in passthrough, let the Start command pass through
to the follower in all cases. Only do the negotiate/buffers when not in
passthrough.

This fixes a case where the buffers are cleared on the alsa node and it
Pauses but then never resumes in a Start because the node is already
started. The real problem is probably somewhere else (in PipeWire) but
for now this will improve things in passthrough.

alsa: do playback sync even when alsa is paused

We only start the ALSA pcm after we get our first buffer.

We still need to do the sync through (and get the number of prefilled
samples) to make sure we set our new timeout and don't keep on waking
up quickly while the graph fetches the first buffer.

context: use smallest fraction for largest rate

To find the largest rate, we need to select the smallest fraction.

This fixes the case where 44100Hz was selected when there are 2 nodes,
one suggesting 44.1Khz and another 48Khz. After this, 48KHz is
selected.

bluez5: adapt to changes in BlueZ BAP API

BlueZ master branch now puts various QoS fields into a separate dict, in
properties and method input and return values.

Adjust our code to match that.

spa: debug: log: add missing includes

Include `spa/debug/{pod,format,mem,dict}.h` for the declarations
of `spa_debugc_{pod,format,mem,dict}()`.

loop: rate limit xrun messages

When the reader thread locks up for some reason, avoid excessive
logs about the invoke queue being filled.

See #3532

pipewire: rtsp-client: use flexible array member for outgoing message content

There is no need to have an extra pointer in the struct that is
set to right after the object at initialization and is never modified
because a flexible array member can be used instead.
This has advantages: `struct message` is now smaller, and there is
no extra load when accessing `struct message::data`.

pulse-server: reorder initialization to make proper cleanup possible

Previously, in case of errors, the struct members were not disposed of
correctly, leading to memory leaks. Reordering the initialization slightly
makes it possible to call `impl_free()`.

See https://gitlab.freedesktop.org/pipewire/pipewire/-/issues/1840#note_2106874

modules: fix compilation on clang

impl-link: recalc graph after destroy prepared link

Get and use the prepared state of the link *before* unpreparing
the link as part of the destroy.

filter-chain: have separate control values per handle

When we duplicate the filter, also duplicate the control values instead
of reusing the same value for all copies. We then duplicate the value
ourselves when setting a control. This makes it possible to later use
this for volume control.

filter-chain: fix gain when mixing 1 source

The gain was not used when mixing just one source.

audioconvert: silence some debug info

module-raop-sink: Send POST /feedback every 2 seconds

module-raop-sink: Use "PipeWire/$VERSION" as UserAgent

module-raop-sink: Set DACP-ID header