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// Copyright (c) 2010 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Protocol for video messages.
syntax = "proto2";
option optimize_for = LITE_RUNTIME;
package remoting;
// TODO(ajwong): Determine if these fields should be optional or required.
message VideoPacketFormat {
// Identifies how the image was encoded.
enum Encoding {
ENCODING_INVALID = -1;
ENCODING_VERBATIM = 0;
ENCODING_ZLIB = 1;
ENCODING_VP8 = 2;
};
// X,Y coordinates (in screen pixels) for origin of this update.
optional int32 x = 1;
optional int32 y = 2;
// Width, height (in screen pixels) for this update.
optional int32 width = 3;
optional int32 height = 4;
// The encoding used for this image update.
optional Encoding encoding = 5 [default = ENCODING_INVALID];
}
message VideoPacket {
// Bitmasks for use in the flags field below.
//
// The encoder may fragment one update into multiple partitions.
// Each partition may be divided into multiple packets depending on
// how the encoder outputs data. Thus, one update can logically
// consist of multiple packets. The FIRST_PACKET and LAST_PACKET
// flags are used to indicate the start and end of a partition. The
// LAST_PARTITION flag is set for the last packet in the last
// partition. Here are notable consequences:
// * Both FIRST_PACKET and LAST_PACKET may be set if an update is only
// one packet long.
// * The VideoPacketFormat is only supplied in a FIRST_PACKET.
// * LAST_PARTITION can be set only in packet that has LAST_PACKET set.
// * An local update cannot change format between a FIRST_PACKET and
// a LAST_PACKET.
// * All packets in one logical update must be processed in order, and
// packets may not be skipped.
enum Flags {
FIRST_PACKET = 1;
LAST_PACKET = 2;
LAST_PARTITION = 4;
}
optional int32 flags = 1 [default = 0];
// The sequence number of the partial data for updating a rectangle.
optional int32 sequence_number = 2 [default = 0];
optional int32 timestamp = 3 [default = 0];
// This is provided on the first packet of the rectangle data, when
// the flags has FIRST_PACKET set.
optional VideoPacketFormat format = 4;
optional bytes data = 5;
}
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