syntax = "proto3";
package termix.audio_backend;

import "google/protobuf/empty.proto";

service AudioBackendRPC {
  // Stop the active audio server
  rpc StopClient(google.protobuf.Empty) returns (google.protobuf.Empty);
  // Start the audio server of choice 
  rpc StartClient(DesiredAudioBacked) returns (google.protobuf.Empty);
  // Get information about the possible audio backend configuration options
  rpc DescribeBackend(DesiredAudioBacked) returns (AudioBackendDescription);
  rpc InitConnection(google.protobuf.Empty) returns (google.protobuf.Empty);
  rpc GetAvailableBackends(google.protobuf.Empty) returns (BackendList);
}

enum SupportedAudioBackends {
  AB_UNSPECIFIED = 0;
  AB_JACK = 1;
  AB_COREAUDIO = 2;
}

message DesiredAudioBacked {
  SupportedAudioBackends backend = 1;
  CoreAudioOptions core_audio_opts = 2;
}

message AudioBackendDescription {
  CoreAudioAvailableOptions core_audio_description = 1;
  repeated string input_devices = 2;
  repeated string output_devices = 3;
}

message CoreAudioAvailableOptions {
  repeated string input_devices = 1;
  repeated string output_devices = 2;
}

message CoreAudioOptions {
  string input_device = 1; 
}

message BackendList {
  repeated Backend backends = 1;
}

message Backend {
  string name = 1;
}