Define remote playback proto buffer

media/remoting/proto/remoting_rpc_message.proto

Index: media/remoting/proto/remoting_rpc_message.proto
diff --git a/media/remoting/proto/remoting_rpc_message.proto b/media/remoting/proto/remoting_rpc_message.proto
new file mode 100644
index 0000000000000000000000000000000000000000..bf3c8f2dd106a7891df56181f28408fefa7796a0
--- /dev/null
+++ b/media/remoting/proto/remoting_rpc_message.proto
@@ -0,0 +1,561 @@
+// 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;
+
+// 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;
+  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;
+  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;
+  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;
+  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;
+}
+
+enum MediaKeysSessionType {
+  TEMPORARY_SESSION = 0;
+  PERSISTENT_LICENSE_SESSION = 1;
+  PERSISTENT_RELEASE_MESSAGE_SESSION = 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 {

[miu, 2016/09/16 18:14:13]

Why would the receiver ever request a flush? If it is issued before a seek, as
an optimization, then that would better be handled by the sender as part of the
seek operation.

I'm not sure, from looking at the RPC proto here, how seeking is supposed to
work. We should discuss this in our next meeting, just to make sure we're on the
same page.

[erickung1, 2016/09/16 21:18:38]

this is the message sender sends to receiver, to indicates flushing those
pending data(which may be in the air due to the fact that RPC message may arrive
earlier than AV data through UDP, even RPC is sent later than AV data.

[erickung1, 2016/09/19 17:04:34]

This is the RPC message sent from sender to receiver. This is to tell receiver
that there is flush operation and please discard the pending data in the
pipeline so that seeking can be done/resume from the new position asap.

 

+  optional uint32 audio_frame_id = 1;

[miu, 2016/09/16 18:14:13]

This came up in discussion with xjz@ yesterday: There shouldn't be any
references to concepts related to the Cast Streaming protocol in these RPCs.
That's crossing abstraction layers, and would be forcing the coupling of the
remoting media stack with the Cast Streaming protocol. This is bad because a
change to either could easily and unexpectedly break things.

As for this LOC, the concept of a frame_id does not exist anywhere else in the
Chrome media stack (e.g., try running: `cd src/media && git grep -iP
'frame.?id'` | grep -vP '^(capture|cast|gpu)/'). It seems that the frame
timestamps are used for finding/synchronizing among individual frames.

So, please go through and scrub the RPC stack to make sure only media stack
concepts are being used.

[erickung1, 2016/09/19 17:04:34]

(offline discussion is done)
After discussion, we will keep this field but rename it to count since this is
to allow receiver to know which packets needs to be expected as the first new
packet after the flush/seek operation.

The reason is because the RPC and data streaming can be done in different
pipe/protocol, so the data delivered to receiver may not in the right order as
is sends out from the sender. having a name/indication is necessary.

+  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 uint32 frame_id = 2;

[miu, 2016/09/16 18:14:13]

Instead of frame_id, this could be:

1. read until "timestamp_usec"
2. read up to N additional bytes' worth of frames

IMHO, #1 would probably work better because it is independent of the frame rate
of the content, and probably would result in simpler code on both the receiver
and sender side. Though, #2 could be better if the receiver has a rough idea of
its target buffer fill (and capacity).

[erickung1, 2016/09/16 21:18:38]

#2 is not ideal because it depends on the bit rate of the stream
#1 works only for audio, but not for video because PTS can jump due to B
frame(not like mirroring, that's the reason the timestamp in RTP is incremental
and meaningless). Also on render process side we don't have DTS information in
the renderer.

I feel like the reason we kind of need a counter concept(or frame id) is because
we use two different protocol to send data over, which is different from
existing media pipeline(that everything runs in the single thread)

[erickung1, 2016/09/19 17:04:34]

after discussion, we change the name to count

+}
+
+message DemuxerStreamInitializeCallback {
+  optional int32 type = 1;
+  optional AudioDecoderConfig audio_decoder_config = 2;
+  optional VideoDecoderConfig video_decoder_config = 3;
+}
+
+message DemuxerStreamReadUntilCallback {
+  enum Status {
+    kOk = 0;
+    kAborted = 1;
+    kConfigChanged = 2;
+  };
+
+  optional Status status = 1;
+  optional uint32 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 {
+  enum EmeInitDataType {
+    UNKNOWN = 0;
+    WEBM = 1;
+    CENC = 2;
+    KEYIDS = 3;
+  };
+
+  optional MediaKeysSessionType session_type = 1;
+  optional EmeInitDataType init_data_type = 2;
+  optional int32 callback_handle = 3;
+  optional bytes init_data = 4;
+}
+
+message CdmLoadSession {
+  optional MediaKeysSessionType 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 {
+  enum RpcProc {
+    // 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;
+    // Renderer callbacks
+    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;
+  };
+
+  // Component base of RPC message handle. This allows both sender and receiver
+  // to send or handle message in desired individual components.
+  optional int32 handle = 1;
+
+  // RpcProc of this RPC message
+  optional RpcProc proc = 2;
+
+  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;
+
+    // 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;
+  };
+}