+ // See comments on ALSAPool::create_dead_card().
+ DeviceSpec create_dead_card(const std::string &name, const std::string &info, unsigned num_channels)
+ {
+ unsigned dead_card_index = alsa_pool.create_dead_card(name, info, num_channels);
+ return DeviceSpec{InputSourceType::ALSA_INPUT, dead_card_index};
+ }
+
+ void set_display_name(DeviceSpec device_spec, const std::string &name);
+
+ // Note: The card should be held (currently this isn't enforced, though).
+ void serialize_device(DeviceSpec device_spec, DeviceSpecProto *device_spec_proto);
+
+ enum class MappingMode {
+ // A single bus, only from a video card (no ALSA devices),
+ // only channel 1 and 2, locked to +0 dB. Note that this is
+ // only an UI abstraction around exactly the same audio code
+ // as MULTICHANNEL; it's just less flexible.
+ SIMPLE,
+
+ // Full, arbitrary mappings.
+ MULTICHANNEL
+ };
+
+ // Automatically sets mapping mode to MappingMode::SIMPLE.
+ void set_simple_input(unsigned card_index);
+
+ // If mapping mode is not representable as a MappingMode::SIMPLE type
+ // mapping, returns numeric_limits<unsigned>::max().
+ unsigned get_simple_input() const;