// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// Protocol for control messages.

syntax = "proto2";

option optimize_for = LITE_RUNTIME;

package remoting.protocol;

import "layout_key_function.proto";

// Set the host resolution to match the client. If screen_id is omitted, then
// the message will be ignored unless there is only one host display.
//
// If none of the fields (apart from screen_id) are present, restore the host
// resolution instead.
message ClientResolution {
  // Width and height of the client in device pixels.
  optional int32 width_pixels = 1;
  optional int32 height_pixels = 2;

  // Deprecated width and height of the client in device pixels.
  optional int32 width_deprecated = 3;
  optional int32 height_deprecated = 4;

  // Horizontal and vertical DPI of the screen. If either of these is zero or
  // unset, the corresponding DPI should be assumed to be 96 (Windows' default)
  optional int32 x_dpi = 5;
  optional int32 y_dpi = 6;

  // The screen_id from the most recent VideoTrackLayout message.
  optional int64 screen_id = 7;
}

message VideoControl {
  // Enables the video channel if true, pauses if false.
  optional bool enable = 1;

  message FramerateBoost {
    // Indicates whether to enable or disable this feature. When enabled, the
    // capture interval will be adjusted when remote input is received. The goal
    // is to reduce the latency between when input is received and a new frame
    // is generated which will lead to higher responsiveness when the user
    // interacts with the host.
    optional bool enabled = 1;

    // Adjusting the capture interval will change the framerate, a lower
    // interval value will typically lead to a higher FPS from the host.
    // The minimum value is 1, maximum is 1000 but that would lead to 1 FPS
    // which would be silly.
    optional int32 capture_interval_ms = 2;

    // Indicates the amount of time the capture interval will be boosted after
    // each remote input event is received.  Minimum value is 1, maximum is
    // 1000 (1 second).
    optional int32 boost_duration_ms = 3;
  }
  optional FramerateBoost framerate_boost = 4;

  // Sets the target framerate for the host. Note that the actual framerate is
  // variable so this value will update the rate at which frames are captured
  // but the framerate will be lower if there aren't enough changes on the
  // screen or the host is not capable of generating frames quickly enough.
  optional uint32 target_framerate = 5;

  // Lossless encode and color settings are no longer set via this message.
  reserved 2, 3;
  reserved "lossless_encode", "lossless_color";
}

message AudioControl {
  // Enables the audio channel if true, pauses if false.
  optional bool enable = 1;
}

message CursorShapeInfo {
  // Width, height (in screen pixels) of the cursor.
  optional int32 width = 1;
  optional int32 height = 2;

  // X,Y coordinates (relative to upper-left corner) of the cursor hotspot.
  optional int32 hotspot_x = 3;
  optional int32 hotspot_y = 4;

  // Cursor pixmap data in 32-bit BGRA format.
  optional bytes data = 5;
}

message Capabilities {
  // List of capabilities supported by the sender (case sensitive, capabilities
  // are separated by spaces).
  optional string capabilities = 1;
}

message PairingRequest {
  // Human-readable name of the client.
  optional string client_name = 1;
}

message PairingResponse {
  // Unique identifier for this client.
  optional string client_id = 1;

  // Shared secret for this client.
  optional string shared_secret = 2;
}

message ExtensionMessage {
  // The message type. This is used to dispatch the message to the correct
  // recipient.
  optional string type = 1;

  // String-encoded message data. The client and host must agree on the encoding
  // for each message type; different message types need not shared the same
  // encoding.
  optional string data = 2;
}

message VideoTrackLayout {
  // Unique display identifier, from ScreenId in desktop_capture_types.h.
  // In client-to-host messages, an unset screen_id indicates that the client is
  // requesting a new display to be added to the display layout.
  optional int64 screen_id = 8;

  // Name of the video stream, from the WebRTC MediaStream.id property.
  // Absent in client-to-host messages if the client is requesting a new
  // display.
  optional string media_stream_id = 1;

  // Position of the top left corner of the rectangle covered by the video
  // track in DIPs (device independent pixels).
  optional int32 position_x = 2;
  optional int32 position_y = 3;

  // Size of the area covered by the video track in DIPs.
  optional int32 width = 4;
  optional int32 height = 5;

  // DPI of the screen.
  optional int32 x_dpi = 6;
  optional int32 y_dpi = 7;

  // Display name. This is displayed in the client UI and is informational only.
  optional string display_name = 9;

  // TODO(yuweih): Add bpp to the message.
}

message VideoLayout {
  // Layout for each video track.
  repeated VideoTrackLayout video_track = 1;

  // True if this display configuration supports capturing the entire desktop.
  // Absent in client-to-host messages.
  optional bool supports_full_desktop_capture = 2;

  // Screen ID of the display to be associated with the main window on the
  // client. Optional. If not set, the client will choose a sensible display to
  // be associated with the main window.
  //
  // This field is ignored in client-to-host messages.
  optional int64 primary_screen_id = 3;
}

message SelectDesktopDisplayRequest {
  // Identifier for display to select. Valid strings are "0", "1", ...
  // The "all" string is used to select the entire desktop.
  optional string id = 1;
}

// Next ID: 2
message KeyboardLayout {
  // Next ID: 3
  message KeyAction {
    oneof action {
      LayoutKeyFunction function = 1;
      string character = 2;
    }
  }

  // Next ID: 2
  message KeyBehavior {
    // Maps 0-based shift level to key action. (Note: because this is zero-
    // based, it will be one less than the corresponding ISO shift level.)
    map<uint32, KeyAction> actions = 1;
  }

  // Map USB code to key behavior.
  map<uint32, KeyBehavior> keys = 1;
}

// Next ID: 2
message TransportInfo {
  // Transport layer protocol the message sender uses to connect to the relay
  // server or the peer (if connection not relayed).
  // Possible values are those defined in the protocol and relayProtocol fields
  // in the RTCIceCandidateStats dictionary.
  // If the host failed to get protocol using WebRTC API, this field will be set
  // to "api-error".
  optional string protocol = 1;
}

// Next ID: 5
message PeerConnectionParameters {
  // Sets preferred minimum and maximum bitrates. Unset fields means no
  // preference on the bitrate. Clients might need to keep track of existing
  // parameters if they need to do incremental changes.
  optional int32 preferred_min_bitrate_bps = 1;
  optional int32 preferred_max_bitrate_bps = 2;

  // Requests an ICE restart. This causes the host to initiate a new SDP
  // offer/answer exchange, and restarts the ICE gathering/connection sequence.
  // This can be used to re-establish a connection, without needing to
  // re-authenticate the user.
  optional bool request_ice_restart = 3;

  // Requests the host to initiate a new SDP offer/answer exchange, without
  // restarting ICE. This can be used to change SDP configuration (for example,
  // switching to a different codec), without needing a full reconnection.
  optional bool request_sdp_restart = 4;
}

// Next ID: 2
message ActiveDisplay {
  optional int64 screen_id = 1;
}