+ AudioDevice *find_audio_device(DeviceSpec device_spec);
+
+ void find_sample_src_from_device(const std::map<DeviceSpec, std::vector<float>> &samples_card, DeviceSpec device_spec, int source_channel, const float **srcptr, unsigned *stride);
+ void fill_audio_bus(const std::map<DeviceSpec, std::vector<float>> &samples_card, const InputMapping::Bus &bus, unsigned num_samples, float *output);
+ void reset_resampler_mutex_held(DeviceSpec device_spec);
+ void reset_alsa_mutex_held(DeviceSpec device_spec);
+ std::map<DeviceSpec, DeviceInfo> get_devices_mutex_held() const;
+ void update_meters(const std::vector<float> &samples);
+ void measure_bus_levels(unsigned bus_index, const std::vector<float> &left, const std::vector<float> &right);
+ void send_audio_level_callback();
+
+ unsigned num_cards;
+
+ mutable std::timed_mutex audio_mutex;
+
+ AudioDevice video_cards[MAX_VIDEO_CARDS]; // Under audio_mutex.
+
+ // TODO: Figure out a better way to unify these two, as they are sharing indexing.
+ AudioDevice alsa_inputs[MAX_ALSA_CARDS]; // Under audio_mutex.
+ std::vector<ALSAInput::Device> available_alsa_cards;