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diff --git a/tuner/proto/channel.proto b/tuner/proto/channel.proto
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+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+syntax = 'proto2';
+
+package com.android.tv.tuner.data;
+
+option java_package = "com.android.tv.tuner.data";
+option java_outer_classname = "Channel";
+
+import "track.proto";
+
+// Holds information about a channel used in the tuners.
+message TunerChannelProto {
+  optional TunerType type = 1;
+  optional string short_name = 2;
+  optional string long_name = 3;
+  optional int32 frequency = 4;
+  optional string modulation = 5;
+  optional string filepath = 6;
+  optional int32 program_number = 7;
+  optional int32 virtual_major = 8;
+  optional int32 virtual_minor = 9;
+  optional int64 channel_id = 10;
+  optional string description = 11;
+  optional int32 tsid = 12;
+  optional int32 video_pid = 13;
+  optional VideoStreamType video_stream_type = 14;
+  optional int32 pcr_pid = 15;
+  repeated AtscAudioTrack audio_tracks = 16;
+  repeated int32 audio_pids = 17;
+  repeated AudioStreamType audio_stream_types = 18;
+  optional int32 audio_track_index = 19;
+  repeated AtscCaptionTrack caption_tracks = 20;
+  optional bool has_caption_track = 21;
+  optional AtscServiceType service_type = 22 [default = SERVICE_TYPE_ATSC_DIGITAL_TELEVISION];
+  optional bool recording_prohibited = 23;
+  optional string video_format = 24;
+  /**
+   * The flag indicating whether this TV channel is locked or not.
+   * This is primarily used for alternative parental control to prevent unauthorized users from
+   * watching the current channel regardless of the content rating
+   * @see <a href="https://developer.android.com/reference/android/media/tv/TvContract.Channels.html#COLUMN_LOCKED">link</a>
+   */
+  optional bool locked = 25;
+}
+
+// Enum describing the types of tuner.
+enum TunerType {
+  TYPE_TUNER = 0;
+  TYPE_FILE = 1;
+  TYPE_NETWORK = 2;
+}
+
+// Enum describing the types of video stream.
+enum VideoStreamType {
+  // ISO/IEC 11172 Video (MPEG-1)
+  MPEG1 = 0x01;
+  // ISO/IEC 13818-2 (MPEG-2) Video
+  MPEG2 = 0x02;
+  // ISO/IEC 14496-2 (MPEG-4 H.263 based)
+  H263 = 0x10;
+  // ISO/IE 14496-10 (H.264 video)
+  H264 = 0x01b;
+  // ISO/IE 23008-2 (H.265 video)
+  H265 = 0x024;
+}
+
+// Enum describing the types of audio stream.
+enum AudioStreamType {
+  // ISO/IEC 11172 Audio (MPEG-1)
+  MPEG1AUDIO = 0x03;
+  // ISO/IEC 13818-3 Audio (MPEG-2)
+  MPEG2AUDIO = 0x04;
+  // ISO/IEC 13818-7 Audio with ADTS transport syntax
+  MPEG2AACAUDIO = 0x0f;
+  // ISO/IEC 14496-3 (MPEG-4 LOAS multi-format framed audio)
+  MPEG4LATMAACAUDIO = 0x11;
+  // Dolby Digital Audio (ATSC)
+  A52AC3AUDIO = 0x81;
+  // Dolby Digital Plus Audio (ATSC)ISO/IEC 14496-2Video (MPEG-1)
+  EAC3AUDIO = 0x87;
+}
+
+// Enum describing ATSC service types
+// See ATSC Code Points Registry.
+enum AtscServiceType {
+  SERVICE_TYPE_ATSC_RESERVED = 0x0;
+  SERVICE_TYPE_ANALOG_TELEVISION_CHANNELS = 0x1;
+  SERVICE_TYPE_ATSC_DIGITAL_TELEVISION = 0x2;
+  SERVICE_TYPE_ATSC_AUDIO = 0x3;
+  SERVICE_TYPE_ATSC_DATA_ONLY_SERVICE = 0x4;
+  SERVICE_TYPE_SOFTWARE_DOWNLOAD = 0x5;
+  SERVICE_TYPE_UNASSOCIATED_SMALL_SCREEN_SERVICE = 0x6;
+  SERVICE_TYPE_PARAMETERIZED_SERVICE = 0x7;
+  SERVICE_TYPE_ATSC_NRT_SERVICE = 0x8;
+  SERVICE_TYPE_EXTENDED_PARAMERTERIZED_SERVICE = 0x9;
+}