// Used to serialize state between runs. Currently only audio input mappings,
// but in theory we could do the entire mix, video inputs, etc.

syntax = "proto2";

// Similar to DeviceSpec, but only devices that are used are stored,
// and contains additional information that will help us try to map
// to the right device even if the devices have moved around.
message DeviceSpecProto {
	// Members from DeviceSpec itself.
	enum InputSourceType { SILENCE = 0; CAPTURE_CARD = 1; ALSA_INPUT = 2; };
	optional InputSourceType type = 1;
	optional int32 index = 2;

	// Additional information.
	optional string display_name = 3;
	optional string alsa_name = 4;  // Only for ALSA devices.
	optional string alsa_info = 5;  // Only for ALSA devices.
	optional int32 num_channels = 6;  // Only for ALSA devices.
	optional string address = 7;  // Only for ALSA devices.
}

// Corresponds to InputMapping::Bus.
message BusProto {
	optional string name = 1;
	optional int32 device_index = 2;  // Index into the "devices" array.
	optional int32 source_channel_left = 3;
	optional int32 source_channel_right = 4;
}

// Corresponds to InputMapping.
message InputMappingProto {
	repeated DeviceSpecProto device = 1;
	repeated BusProto bus = 2;
}