Audio loaders currently always output two channels, even if they were
encoded as mono. Therefore, we have to hardcode the channel count in
our audio plugin to avoid crashing until we can handle mono or multi-
channel audio better.
Fixes#21898
We would start the timer to send playback time updates to the element
before playback had started, so in cases where the `HTMLMediaElement`
(incorrectly) creates both an `AudioTrack` and `VideoTrack`, it will
not cause the seek bar to flicker between the current video position
and zero.
The previous update time of 10 ms was set completely arbitrarily, but
puts an unnecessary load on the CPU. This reduces the rate, and it can
be adjusted in future depending on what web pages expect.
The implementation of this plugin is meant to eventually replace all
current audio plugins in Ladybird. The benefits over the current Qt-
based audio playback plugin in Ladybird are:
- Low latency: With direct access to PulseAudio, we can ask for a
specific latency to output to allow minimal delay when pausing or
seeking a stream.
- Accurate timestamps: The Qt audio playback API does not expose audio
time properly. When we have access directly to PulseAudio APIs, we can
enable their timing interpolation to get an accurate monotonically-
increasing timestamp of the playing audio.
- Resiliency: With more control over how the underlying audio API is
called, we have the power to fix most bugs we might encounter. The
PulseAudio wrappers already avoid some bugs that occur with QAudioSink
when running through WSLg.
