syntax = "proto3";

package callsignaling;

option java_package = "ch.threema.protobuf.callsignaling";

// Root signaling message
message Envelope {
  // Random amount of padding, ignored by the receiver
  bytes padding = 1;

  oneof content {
    VideoQualityProfile video_quality_profile = 2;
    CaptureState capture_state_change = 3;
  }
}

// Generic 2D resolution
message Resolution {
  uint32 width = 1;
  uint32 height = 2;
}

// The app switched to a new video quality profile
//
// In order to be forwards-compatible, the raw configuration of the profile
// (bitrate, resolution, etc) should also be included in this message. This
// way, if an unknown enum value is received, the receiver can simply use the
// raw values instead.
message VideoQualityProfile {
  // The quality profile
  enum QualityProfile {
    // Very high quality, used only when explicitly selected by the user
    MAX = 0;
    // High quality, used by default in non-metered networks
    HIGH = 1;
    // Low quality, optimize for bandwidth, used by default in metered networks
    LOW = 2;
  }
  QualityProfile profile = 1;

  // The max bitrate in kbps
  uint32 max_bitrate_kbps = 2;
  // The max resolution (in landscape orientation)
  Resolution max_resolution = 3;
  // The max framerate
  uint32 max_fps = 4;
}

// Signal changes in the capturing state (e.g. video camera enabled or disabled)
message CaptureState {
  // The capture state of a capturing device
  enum Mode {
    // Off, not sending any data
    OFF = 0;
    // On, sending data
    ON = 1;
  }
  Mode state = 1;

  // The capture device type
  enum CaptureDevice {
    // Capturing from a camera
    CAMERA = 0;

    // Capturing from screen sharing
    SCREEN_SHARING = 1;

    // Capturing from a microphone
    MICROPHONE = 2;
  }
  CaptureDevice device = 2;
}