Define remote playback proto buffer

media/remoting/proto/remoting_rpc_message.proto

+// Copyright 2016 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 buffer for Media Remoting.
+
+syntax = "proto2";
+
+option optimize_for = LITE_RUNTIME;
+
+package media.remoting.pb;
+
+enum RpcProc {

[miu, 2016/09/08 01:07:34]

Perhaps this enum should be nested inside of RpcMessage (since it is only used
there)?

[erickung1, 2016/09/13 03:52:52]

Done.

+  // Remoting setup
+  RPC_INTERNAL = 0;
+  RPC_ACQUIRE_RENDERER = 1;
+  RPC_ACQUIRE_RENDERER_DONE = 2;
+  RPC_ACQUIRE_CDM = 3;
+  RPC_ACQUIRE_CDM_DONE = 4;
+  // Renderer message
+  RPC_R_INITIALIZE = 1000;
+  RPC_R_FLUSHUNTIL = 1001;
+  RPC_R_STARTPLAYINGFROM = 1002;
+  RPC_R_SETPLAYBACKRATE = 1003;
+  RPC_R_SETVOLUME = 1004;
+  RPC_R_SETCDM = 1005;
+  RPC_R_INITIALIZE_CALLBACK = 1100;
+  RPC_R_FLUSHUNTIL_CALLBACK = 1101;
+  RPC_R_SETCDM_CALLBACK = 1102;
+  // Renderer client message
+  RPC_RC_ONTIMEUPDATE = 2000;
+  RPC_RC_ONBUFFERINGSTATECHANGE = 2001;
+  RPC_RC_ONENDED = 2002;
+  RPC_RC_ONERROR = 2003;
+  RPC_RC_ONVIDEONATURALSIZECHANGE = 2004;
+  RPC_RC_ONVIDEOOPACITYCHANGE = 2005;
+  RPC_RC_ONSTATISTICSUPDATE = 2006;
+  RPC_RC_ONWAITINGFORDECRYPTIONKEY = 2007;
+  RPC_RC_ONDURATIONCHANGE = 2008;
+  // DemuxerStream message
+  RPC_DS_INITIALIZE = 3000;
+  RPC_DS_READUNTIL = 3001;
+  RPC_DS_ENABLEBITSTREAMCONVERTER = 3002;
+  // DemuxerStream callbacks
+  RPC_DS_INITIALIZE_CALLBACK = 3100;
+  RPC_DS_READUNTIL_CALLBACK = 3101;
+  // ContentDecryptionModule
+  RPC_CDM_SETCLIENT = 4000;
+  RPC_CDM_INITIALIZE = 4001;
+  RPC_CDM_SETSERVERCERTIFICATE = 4002;
+  RPC_CDM_CREATESESSIONANDGENERATEREQUEST = 4003;
+  RPC_CDM_LOADSESSION = 4004;
+  RPC_CDM_UPDATESESSION = 4005;
+  RPC_CDM_CLOSESESSION = 4006;
+  RPC_CDM_REMOVESESSION = 4007;
+  // ContentDecryptionModule callbacks
+  RPC_CDM_INITIALIZE_CALLBACK = 4100;
+  RPC_CDM_SETSERVERCERTIFICATE_CALLBACK = 4101;
+  RPC_CDM_CREATESESSIONANDGENERATEREQUEST_CALLBACK = 4102;
+  RPC_CDM_LOADSESSION_CALLBACK = 4103;
+  RPC_CDM_UPDATESESSION_CALLBACK = 4104;
+  RPC_CDM_CLOSESESSION_CALLBACK = 4105;
+  RPC_CDM_REMOVESESSION_CALLBACK = 4106;
+  // ContentDecryptionModule client
+  RPC_CDMC_ONSESSIONMESSAGE = 5000;
+  RPC_CDMC_ONSESSIONCLOSED = 5001;
+  RPC_CDMC_ONSESSIONKEYSCHANGE = 5002;
+  RPC_CDMC_ONSESSIONEXPIRATIONUPDATE = 5003;
+};
+
+// DecoderBuffer information which will be sent using RTP packets. The actual
+// decoder buffer is not included in this proto data structure.
+message DecoderBuffer {
+  optional int64 timestamp_usec = 1;

[miu, 2016/09/08 01:07:34]

Some of these feel like they shouldn't be optional; or, if they should, there
should be a default value (e.g., in the case of |is_eos|).

[erickung1, 2016/09/08 22:21:50]

The reason I use optional for every field in the beginning

1. although I use proto2, but in proto3 every field will become optional
2. If we make some field to repeated, the field can't be deprecated in the
future because the version mismatch will be an issue(or I think Chrome browser
always forced people to update??)
3. Some fields like Rect may be straightforward to make it to repeated. but take
this DecoderBuffer example, it's not.

For example,
- if this is EOS frame, we will set the is_eos
- if it's a valid buffer, we set timestamp
- if it's key frame, we set is_key_frame
- if it's encrypted content, we set decrypt_config

So it makes me feel like we have to spend amount of time thinking this by
defining the proto structure. The best thing that we should do, is probably just
to set everything to optional, but also set a default value. and for both sender
and receiver who are interested in particular RPC, should check if necessary
information are there, otherwise, considering it as invalid RPC message.

How do you think??

[erickung1, 2016/09/13 03:52:52]

after the discussion, will put every proto field optional especially for version
control

[miu, 2016/09/13 05:40:57]

Sounds good. Also, if we do encounter an invalid RPC message, seems like we
should stop remoting immediately, since the two endpoints would be in
inconsistent states.

+  optional int64 duration_usec = 2;
+  optional bool is_key_frame = 3;
+  optional DecryptConfig decrypt_config = 4;
+  optional int64 front_discard_usec = 5;
+  optional int64 back_discard_usec = 6;
+  optional int64 splice_timestamp_usec = 7;
+  optional bytes side_data = 8;
+  // To distinguish from valid 0-length buffers
+  optional bool is_eos = 9;
+}
+
+// Utility proto data structure
+message Size {
+  optional int32 width = 1;

[miu, 2016/09/08 01:07:34]

Why are these fields optional? Seems like the Size object can be optional, but
once you have a Size, a Size should always consist of a known width and height.

[erickung1, 2016/09/13 03:52:52]

after the discussion, will put every proto field optional especially for version
control

+  optional int32 height = 2;
+}
+
+message EncryptionScheme {
+  // Align with EncryptionScheme::CipherMode
+  enum CipherMode {
+    CIPHER_MODE_UNENCRYPTED = 0;
+    CIPHER_MODE_AES_CTR = 1;
+    CIPHER_MODE_AES_CBC = 2;
+  }
+
+  optional CipherMode mode = 1;

[miu, 2016/09/08 01:07:34]

Mode is optional? Should there be a default value here, then? (e.g.,
CIPHER_MODE_UNENCRYPTED)

[erickung1, 2016/09/13 03:52:52]

ditto

+  optional uint32 encrypt_blocks = 2;
+  optional uint32 skip_blocks = 3;
+}
+
+message AudioDecoderConfig {
+  // Should align with ::media::Codec
+  enum Codec {
+    kUnknownAudioCodec = 0;
+    kCodecAAC = 1;
+    kCodecMP3 = 2;
+    kCodecPCM = 3;
+    kCodecVorbis = 4;
+    kCodecFLAC = 5;
+    kCodecAMR_NB = 6;
+    kCodecAMR_WB = 7;
+    kCodecPCM_MULAW = 8;
+    kCodecGSM_MS = 9;
+    kCodecPCM_S16BE = 10;
+    kCodecPCM_S24BE = 11;
+    kCodecOpus = 12;
+    kCodecEAC3 = 13;
+    kCodecPCM_ALAW = 14;
+    kCodecALAC = 15;
+    kCodecAC3 = 16;
+  }
+
+  // Should align with ::media::SampleFormat
+  enum SampleFormat {
+    kUnknownSampleFormat = 0;
+    kSampleFormatU8 = 1;
+    kSampleFormatS16 = 2;
+    kSampleFormatS32 = 3;
+    kSampleFormatF32 = 4;
+    kSampleFormatPlanarS16 = 5;
+    kSampleFormatPlanarF32 = 6;
+    kSampleFormatPlanarS32 = 7;
+    kSampleFormatS24 = 8;
+  };
+
+  // Should align with ::media::ChannelLayout
+  enum ChannelLayout {
+    CHANNEL_LAYOUT_NONE = 0;
+    CHANNEL_LAYOUT_UNSUPPORTED = 1;
+    CHANNEL_LAYOUT_MONO = 2;
+    CHANNEL_LAYOUT_STEREO = 3;
+    CHANNEL_LAYOUT_2_1 = 4;
+    CHANNEL_LAYOUT_SURROUND = 5;
+    CHANNEL_LAYOUT_4_0 = 6;
+    CHANNEL_LAYOUT_2_2 = 7;
+    CHANNEL_LAYOUT_QUAD = 8;
+    CHANNEL_LAYOUT_5_0 = 9;
+    CHANNEL_LAYOUT_5_1 = 10;
+    CHANNEL_LAYOUT_5_0_BACK = 11;
+    CHANNEL_LAYOUT_5_1_BACK = 12;
+    CHANNEL_LAYOUT_7_0 = 13;
+    CHANNEL_LAYOUT_7_1 = 14;
+    CHANNEL_LAYOUT_7_1_WIDE = 15;
+    CHANNEL_LAYOUT_STEREO_DOWNMIX = 16;
+    CHANNEL_LAYOUT_2POINT1 = 17;
+    CHANNEL_LAYOUT_3_1 = 18;
+    CHANNEL_LAYOUT_4_1 = 19;
+    CHANNEL_LAYOUT_6_0 = 20;
+    CHANNEL_LAYOUT_6_0_FRONT = 21;
+    CHANNEL_LAYOUT_HEXAGONAL = 22;
+    CHANNEL_LAYOUT_6_1 = 23;
+    CHANNEL_LAYOUT_6_1_BACK = 24;
+    CHANNEL_LAYOUT_6_1_FRONT = 25;
+    CHANNEL_LAYOUT_7_0_FRONT = 26;
+    CHANNEL_LAYOUT_7_1_WIDE_BACK = 27;
+    CHANNEL_LAYOUT_OCTAGONAL = 28;
+    CHANNEL_LAYOUT_DISCRETE = 29;
+    CHANNEL_LAYOUT_STEREO_AND_KEYBOARD_MIC = 30;
+    CHANNEL_LAYOUT_4_1_QUAD_SIDE = 31;
+  };
+
+  optional Codec codec = 1;
+  optional EncryptionScheme encryption_scheme = 2;
+  optional SampleFormat sample_format = 3;
+  optional ChannelLayout channel_layout = 4;
+  optional int32 samples_per_second = 5;
+  optional int64 seek_preroll_usec = 6;
+  optional int32 codec_delay = 7;
+  optional bytes extra_data = 8;
+}
+
+message Rect {
+  optional int32 x = 1;

[miu, 2016/09/08 01:07:34]

ditto: Same concern as Size (fields should not be optional).

[erickung1, 2016/09/13 03:52:52]

ditto

+  optional int32 y = 2;
+  optional int32 width = 3;
+  optional int32 height = 4;
+}
+
+message VideoDecoderConfig {
+  // Should align with ::media::VideoCodec
+  enum Codec {
+    kUnknownVideoCodec = 0;
+    kCodecH264 = 1;
+    kCodecVC1 = 2;
+    kCodecMPEG2 = 3;
+    kCodecMPEG4 = 4;
+    kCodecTheora = 5;
+    kCodecVP8 = 6;
+    kCodecVP9 = 7;
+    kCodecHEVC = 8;
+  }
+
+  // Should align with ::media::VideoCodecProfile
+  enum Profile {
+    VIDEO_CODEC_PROFILE_UNKNOWN = -1;
+    H264PROFILE_BASELINE = 0;
+    H264PROFILE_MAIN = 1;
+    H264PROFILE_EXTENDED = 2;
+    H264PROFILE_HIGH = 3;
+    H264PROFILE_HIGH10PROFILE = 4;
+    H264PROFILE_HIGH422PROFILE = 5;
+    H264PROFILE_HIGH444PREDICTIVEPROFILE = 6;
+    H264PROFILE_SCALABLEBASELINE = 7;
+    H264PROFILE_SCALABLEHIGH = 8;
+    H264PROFILE_STEREOHIGH = 9;
+    H264PROFILE_MULTIVIEWHIGH = 10;
+    VP8PROFILE_ANY = 11;
+    VP9PROFILE_PROFILE0 = 12;
+    VP9PROFILE_PROFILE1 = 13;
+    VP9PROFILE_PROFILE2 = 14;
+    VP9PROFILE_PROFILE3 = 15;
+    HEVCPROFILE_MAIN = 16;
+    HEVCPROFILE_MAIN10 = 17;
+    HEVCPROFILE_MAIN_STILL_PICTURE = 18;
+  };
+
+  // Should align with ::media::VideoPixelFormat
+  enum Format {
+    PIXEL_FORMAT_UNKNOWN = 0;
+    PIXEL_FORMAT_I420 = 1;
+    PIXEL_FORMAT_YV12 = 2;
+    PIXEL_FORMAT_YV16 = 3;
+    PIXEL_FORMAT_YV12A = 4;
+    PIXEL_FORMAT_YV24 = 5;
+    PIXEL_FORMAT_NV12 = 6;
+    PIXEL_FORMAT_NV21 = 7;
+    PIXEL_FORMAT_UYVY = 8;
+    PIXEL_FORMAT_YUY2 = 9;
+    PIXEL_FORMAT_ARGB = 10;
+    PIXEL_FORMAT_XRGB = 11;
+    PIXEL_FORMAT_RGB24 = 12;
+    PIXEL_FORMAT_RGB32 = 13;
+    PIXEL_FORMAT_MJPEG = 14;
+    PIXEL_FORMAT_MT21 = 15;
+    PIXEL_FORMAT_YUV420P9 = 16;
+    PIXEL_FORMAT_YUV420P10 = 17;
+    PIXEL_FORMAT_YUV422P9 = 18;
+    PIXEL_FORMAT_YUV422P10 = 19;
+    PIXEL_FORMAT_YUV444P9 = 20;
+    PIXEL_FORMAT_YUV444P10 = 21;
+  };
+
+  // Should align with ::media::ColorSpace
+  enum ColorSpace {
+    COLOR_SPACE_UNSPECIFIED = 0;
+    COLOR_SPACE_JPEG = 1;
+    COLOR_SPACE_HD_REC709 = 2;
+    COLOR_SPACE_SD_REC601 = 3;
+  };
+
+  optional Codec codec = 1;
+  optional EncryptionScheme encryption_scheme = 2;
+  optional Profile profile = 3;
+  optional Format format = 4;
+  optional ColorSpace color_space = 5;
+  optional Size coded_size = 6;
+  optional Rect visible_rect = 7;
+  optional Size natural_size = 8;
+  optional bytes extra_data = 9;
+}
+
+message DecryptConfig {
+  message SubSample {
+    optional uint32 clear_bytes = 1;
+    optional uint32 cypher_bytes = 2;
+  }
+
+  optional bytes key_id = 1;
+  optional bytes iv = 2;
+  repeated SubSample sub_samples = 3;
+}
+
+message PipelineStatistics {
+  optional uint64 audio_bytes_decoded = 1;
+  optional uint64 video_bytes_decoded = 2;
+  optional uint32 video_frames_decoded = 3;
+  optional uint32 video_frames_dropped = 4;
+  optional int64 audio_memory_usage = 5;
+  optional int64 video_memory_usage = 6;
+};
+
+message CdmKeyInformation {
+  // Align with CdmKeyInformation::KeyStatus
+  enum KeyStatus {
+    USABLE = 0;
+    INTERNAL_ERROR = 1;
+    EXPIRED = 2;
+    OUTPUT_RESTRICTED = 3;
+    OUTPUT_DOWNSCALED = 4;
+    KEY_STATUS_PENDING = 5;
+    RELEASED = 6;
+  }
+
+  optional bytes key_id = 1;
+  optional KeyStatus status = 2;
+  optional uint32 system_code = 3;
+}
+
+// Should align with MediaKeys::Exception
+enum MediaKeysException {
+  NOT_SUPPORTED_ERROR = 0;
+  INVALID_STATE_ERROR = 1;
+  INVALID_ACCESS_ERROR = 2;
+  QUOTA_EXCEEDED_ERROR = 3;
+  UNKNOWN_ERROR = 4;
+  CLIENT_ERROR = 5;
+  OUTPUT_ERROR = 6;
+}
+
+// Should align with MediaKeys::MessageType
+enum MediaKeysMessageType {
+  LICENSE_REQUEST = 0;
+  LICENSE_RENEWAL = 1;
+  LICENSE_RELEASE = 2;
+}
+
+// Custom proto data structure
+message RendererInitialize {
+  optional int32 client_handle = 1;
+  optional int32 audio_demuxer_handle = 2;
+  optional int32 video_demuxer_handle = 3;
+  optional int32 callback_handle = 4;
+}
+
+message RendererFlushUntil {
+  optional uint32 audio_frame_id = 1;
+  optional uint32 video_frame_id = 2;
+  optional int32 callback_handle = 3;
+}
+
+message RendererSetCdm {
+  optional int32 cdm_id = 1;
+  optional int32 callback_handle = 2;
+}
+
+message RendererClientOnTimeUpdate {
+  optional int64 time_usec = 1;
+  optional int64 max_time_usec = 2;
+}
+
+message DemuxerStreamReadUntil {
+  optional int32 callback_handle = 1;
+  optional int32 frame_id = 2;
+}
+
+message DemuxerStreamInitializeCallback {
+  optional int32 type = 1;
+  optional AudioDecoderConfig audio_decoder_config = 2;
+  optional VideoDecoderConfig video_decoder_config = 3;
+}
+
+message DemuxerStreamReadUntilCallback {
+  optional int32 status = 1;
+  optional int32 frame_id = 2;
+  optional AudioDecoderConfig audio_decoder_config = 3;
+  optional VideoDecoderConfig video_decoder_config = 4;
+}
+
+message CdmInitialize {
+  optional string key_system = 1;
+  optional string security_origin = 2;
+  optional bool allow_distinctive_identifier = 3;
+  optional bool allow_persistent_state = 4;
+  optional bool use_hw_secure_codecs = 5;
+  optional int32 callback_handle = 6;
+}
+
+message CdmSetServerCertificate {
+  optional int32 callback_handle = 1;
+  optional bytes certificate_data = 2;
+}
+
+message CdmCreateSessionAndGenerateRequest {
+  optional int32 session_type = 1;
+  optional int32 init_data_type = 2;
+  optional int32 callback_handle = 3;
+  optional bytes init_data = 4;
+}
+
+message CdmLoadSession {
+  optional int32 session_type = 1;
+  optional string session_id = 2;
+  optional int32 callback_handle = 3;
+}
+
+message CdmUpdateSession {
+  optional string session_id = 1;
+  optional int32 callback_handle = 2;
+  optional bytes response = 3;
+}
+
+message CdmCloseSession {
+  optional string session_id = 1;
+  optional int32 callback_handle = 2;
+}
+
+message CdmRemoveSession {
+  optional string session_id = 1;
+  optional int32 callback_handle = 2;
+}
+
+message CdmPromise {
+  // These two fields are used only for RPC_CDM_INITIALIZE_CALLBACK
+  optional int32 cdm_id = 1;
+  optional int32 decryptor_handle = 2;
+
+  optional string session_id = 3;
+  optional bool success = 4;
+  optional MediaKeysException exception = 5;
+  optional uint32 system_code = 6;
+  optional string error_message = 7;
+}
+
+message CdmClientOnSessionMessage {
+  optional string session_id = 1;
+  optional MediaKeysMessageType message_type = 2;
+  optional bytes message = 3;
+}
+
+message CdmClientOnSessionKeysChange {
+  optional string session_id = 1;
+  optional bool has_additional_usable_key = 2;
+  repeated CdmKeyInformation key_information = 3;
+}
+
+message CdmClientOnSessionExpirationUpdate {
+  optional string session_id = 1;
+  optional double new_expiry_time_sec = 2;
+}
+
+message RpcMessage {
+  // Handle of this RPC message
+  optional int32 handle = 1;

[miu, 2016/09/08 01:07:34]

Is this a session handle, or does it change per-message somehow? Please document
a little more. :)

[erickung1, 2016/09/13 03:52:52]

Done.

+
+  // RpcProc of this RPC message
+  optional RpcProc proc = 2;

[miu, 2016/09/08 01:07:34]

I'm probably repeating myself a lot here, so I'll just say generally (for this
whole file): Some fields should not be optional. This would allow the protobuf
deserialization code to reject bad messages missing required fields, and greatly
reduce the amount of code you have to write to validate the parsed messages
downstream.

[erickung1, 2016/09/13 03:52:52]

ditto

+
+  oneof rpc_oneof {
+    // For simple RPC which only passes one parameters can use the following
+    // various data type variables without using specific proto data structure.
+    // RPC_ACQUIRE_RENDERER
+    // RPC_ACQUIRE_RENDERER_DONE
+    // RPC_ACQUIRE_CDM
+    // RPC_ACQUIRE_CDM_DONE
+    // RPC_RC_ONBUFFERINGSTATECHANGE
+    // RPC_DS_INITIALIZE_CALLBACK
+    // RPC_DS_READ
+    // RPC_CDM_SETCLIENT
+    int32 integer_value = 3;
+
+    // RPC_R_STARTPLAYINGFROM
+    // RPC_RC_ONDURATIONCHANGE
+    int64 integer64_value = 4;
+
+    // RPC_R_SETPLAYBACKRATE
+    // RPC_R_SETVOLUME
+    double double_value = 5;
+
+    // RPC_R_INITIALIZE_CALLBACK
+    // RPC_R_SETCDM_CALLBACK
+    // RPC_RC_ONVIDEOOPACITYCHANGE
+    bool boolean_value = 6;
+
+    // string only:
+    // RPC_CDMC_ONSESSIONCLOSED
+    string string_value = 7;

[miu, 2016/09/08 01:07:34]

Should this be of type |string| or |bytes|? I'm thinking probably the latter, to
avoid char encoding interpretation?

[erickung1, 2016/09/13 03:52:52]

This message is to send "session id" as a string back to sender.
Wouldn't be proto buffer taking care such thing already?

[miu, 2016/09/13 05:40:57]

Could you please check this? Seems like it should be of type "bytes".

[erickung1, 2016/09/15 02:13:32]

Here is the EME definition https://www.w3.org/TR/encrypted-media/#definitions

in Session ID part, "....A Session ID is a unique string identifier generated by
the CDM t". Since the spec is for JavaScript, and it can be any type for string.
so we may need to change it to bytes, and same with other field in the proto
buffer.

+
+    // RPC_R_INITIALIZE
+    RendererInitialize renderer_initialize_rpc = 100;
+
+    // RPC_R_FLUSHUNTIL
+    RendererFlushUntil renderer_flushuntil_rpc = 101;
+
+    // RPC_R_SETCDM
+    RendererSetCdm renderer_set_cdm_rpc = 102;
+
+    // RPC_RC_ONTIMEUPDATE
+    RendererClientOnTimeUpdate rendererclient_ontimeupdate_rpc = 200;
+    // RPC_RC_ONVIDEONATURALSIZECHANGE
+    Size rendererclient_onvideonatualsizechange_rpc = 201;
+    // RPC_RC_ONSTATISTICSUPDATE
+    PipelineStatistics rendererclient_onstatisticsupdate_rpc = 202;
+
+    // RPC_DS_READUNTIL
+    DemuxerStreamReadUntil demuxerstream_readuntil_rpc = 300;
+
+    // RPC_DS_INITIALIZE_CALLBACK
+    DemuxerStreamInitializeCallback demuxerstream_initializecb_rpc = 400;
+    // RPC_DS_READUNTIL_CALLBACK
+    DemuxerStreamReadUntilCallback demuxerstream_readuntilcb_rpc = 401;
+
+    // RPC_CDM_INITIALIZE
+    CdmInitialize cdm_initialize_rpc = 500;
+    // RPC_CDM_SETSERVERCERTIFICATE
+    CdmSetServerCertificate cdm_setservercertificate_rpc = 501;
+    // RPC_CDM_CREATESESSIONANDGENERATEREQUEST
+    CdmCreateSessionAndGenerateRequest cdm_createsessionandgeneraterequest_rpc =
+        502;
+    // RPC_CDM_LOADSESSION
+    CdmLoadSession cdm_loadsession_rpc = 503;
+    // RPC_CDM_UPDATESESSION
+    CdmUpdateSession cdm_updatesession_rpc = 504;
+    // RPC_CDM_CLOSESESSION
+    CdmCloseSession cdm_closesession_rpc = 505;
+    // RPC_CDM_REMOVESESSION
+    CdmRemoveSession cdm_removesession_rpc = 506;
+
+    // CdmPromise message type used for the following procedure
+    // RPC_CDM_INITIALIZE_CALLBACK
+    // RPC_CDM_SETSERVERCERTIFICATE_CALLBACK
+    // RPC_CDM_CREATESESSIONANDGENERATEREQUEST_CALLBACK
+    // RPC_CDM_LOADSESSION_CALLBACK
+    // RPC_CDM_UPDATESESSION_CALLBACK
+    // RPC_CDM_CLOSESESSION_CALLBACK
+    // RPC_CDM_REMOVESESSION_CALLBACK
+    CdmPromise cdm_promise_rpc = 600;
+
+    // RPC_CDMC_ONSESSIONMESSAGE
+    CdmClientOnSessionMessage cdmclient_onsessionmessage_rpc = 601;
+    // RPC_CDMC_ONSESSIONKEYSCHANGE
+    CdmClientOnSessionKeysChange cdmclient_onsessionkeychange_rpc = 602;
+    // RPC_CDMC_ONSESSIONEXPIRATIONUPDATE
+    CdmClientOnSessionExpirationUpdate cdmclient_onsessionexpirationupdate_rpc =
+        603;
+  };
+}