Function updateSingleVehicleSound

src/OpenLoco/src/Audio/VehicleAudio.cpp:163–211

    }

    static void updateSingleVehicleSound(Vehicles::VehicleBase& base, Vehicles::VehicleSound& sound, EntityId headId)
    {
        if (sound.drivingSoundId == SoundObjectId::null)
        {
            if (sound.audioHandle != AudioHandle::null)
            {
                stopVehicleSound(sound);
            }
            return;
        }

        auto* viewport = findBestViewportForEntity(base.position, headId);
        if (viewport == nullptr)
        {
            if (sound.audioHandle != AudioHandle::null)
            {
                stopVehicleSound(sound);
            }
            return;
        }

        auto sid = makeObjectSoundId(sound.drivingSoundId);
        auto attribs = getVehicleAudioAttributes(base, sound, *viewport);

        if (sound.audioHandle == AudioHandle::null)
        {
            attribs.loop = shouldSoundLoop(sid);
            auto buffer = getSoundBuffer(sid);
            if (buffer)
            {
                sound.activeSoundId = sound.drivingSoundId;
                sound.audioHandle = create(*buffer, ChannelId::vehicles, attribs);
                setReverb(sound.audioHandle, isUnderground(base.position) ? kTunnelReverb : kNoReverb);
                Audio::play(sound.audioHandle);
            }
            return;
        }

        if (sound.drivingSoundId != sound.activeSoundId)
        {
            stopVehicleSound(sound);
            return;
        }

        setVolume(sound.audioHandle, attribs.volume);
        setPan(sound.audioHandle, attribs.pan);
        setPitch(sound.audioHandle, attribs.frequency);
        setReverb(sound.audioHandle, isUnderground(base.position) ? kTunnelReverb : kNoReverb);
    }

    void updateVehicleNoise()
    {