Define remote playback proto buffer

media/remoting/rpc/proto_enum_utils.h

Index: media/remoting/rpc/proto_enum_utils.h
diff --git a/media/remoting/rpc/proto_enum_utils.h b/media/remoting/rpc/proto_enum_utils.h
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index 0000000000000000000000000000000000000000..62af79be18c092162ea2415f0bd1ab348b87417e
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+++ b/media/remoting/rpc/proto_enum_utils.h
@@ -0,0 +1,105 @@
+// 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.
+
+#ifndef MEDIA_REMOTING_RPC_PROTO_ENUM_UTILS_H_
+#define MEDIA_REMOTING_RPC_PROTO_ENUM_UTILS_H_
+
+#include "base/optional.h"
+#include "media/base/audio_codecs.h"
+#include "media/base/cdm_key_information.h"
+#include "media/base/channel_layout.h"
+#include "media/base/demuxer_stream.h"
+#include "media/base/encryption_scheme.h"
+#include "media/base/media_keys.h"
+#include "media/base/sample_format.h"
+#include "media/base/video_codecs.h"
+#include "media/base/video_types.h"
+#include "media/remoting/remoting_rpc_message.pb.h"
+
+namespace media {
+namespace remoting {
+
+// The following functions map between the enum values in media/base modules and
+// the equivalents in the media/remoting protobuf classes. The purpose of these
+// converters is to decouple the media/base modules from the media/remoting
+// modules while maintaining compile-time checks to ensure that there are always
+// valid, backwards-compatible mappings between the two.
+//
+// Each returns a base::Optional value. If it is not set, that indicates the
+// conversion failed.
+
+base::Optional<::media::EncryptionScheme::CipherMode>
+ToMediaEncryptionSchemeCipherMode(pb::EncryptionScheme::CipherMode value);
+base::Optional<pb::EncryptionScheme::CipherMode>
+ToProtoEncryptionSchemeCipherMode(::media::EncryptionScheme::CipherMode value);
+
+base::Optional<::media::AudioCodec> ToMediaAudioCodec(
+    pb::AudioDecoderConfig::Codec value);
+base::Optional<pb::AudioDecoderConfig::Codec> ToProtoAudioDecoderConfigCodec(
+    ::media::AudioCodec value);
+
+base::Optional<::media::SampleFormat> ToMediaSampleFormat(
+    pb::AudioDecoderConfig::SampleFormat value);
+base::Optional<pb::AudioDecoderConfig::SampleFormat>
+ToProtoAudioDecoderConfigSampleFormat(::media::SampleFormat value);
+
+base::Optional<::media::ChannelLayout> ToMediaChannelLayout(
+    pb::AudioDecoderConfig::ChannelLayout value);
+base::Optional<pb::AudioDecoderConfig::ChannelLayout>
+ToProtoAudioDecoderConfigChannelLayout(::media::ChannelLayout value);
+
+base::Optional<::media::VideoCodec> ToMediaVideoCodec(
+    pb::VideoDecoderConfig::Codec value);
+base::Optional<pb::VideoDecoderConfig::Codec> ToProtoVideoDecoderConfigCodec(
+    ::media::VideoCodec value);
+
+base::Optional<::media::VideoCodecProfile> ToMediaVideoCodecProfile(
+    pb::VideoDecoderConfig::Profile value);
+base::Optional<pb::VideoDecoderConfig::Profile>
+ToProtoVideoDecoderConfigProfile(::media::VideoCodecProfile value);
+
+base::Optional<::media::VideoPixelFormat> ToMediaVideoPixelFormat(
+    pb::VideoDecoderConfig::Format value);
+base::Optional<pb::VideoDecoderConfig::Format> ToProtoVideoDecoderConfigFormat(
+    ::media::VideoPixelFormat value);
+
+base::Optional<::media::ColorSpace> ToMediaColorSpace(
+    pb::VideoDecoderConfig::ColorSpace value);
+base::Optional<pb::VideoDecoderConfig::ColorSpace>
+ToProtoVideoDecoderConfigColorSpace(::media::ColorSpace value);
+
+base::Optional<::media::CdmKeyInformation::KeyStatus>
+ToMediaCdmKeyInformationKeyStatus(pb::CdmKeyInformation::KeyStatus value);
+base::Optional<pb::CdmKeyInformation::KeyStatus> ToProtoCdmKeyInformation(
+    ::media::CdmKeyInformation::KeyStatus value);
+
+base::Optional<::media::MediaKeys::Exception> ToMediaMediaKeysException(
+    pb::MediaKeysException value);
+base::Optional<pb::MediaKeysException> ToProtoMediaKeysException(
+    ::media::MediaKeys::Exception value);
+
+base::Optional<::media::MediaKeys::MessageType> ToMediaMediaKeysMessageType(
+    pb::MediaKeysMessageType value);
+base::Optional<pb::MediaKeysMessageType> ToProtoMediaKeysMessageType(
+    ::media::MediaKeys::MessageType value);
+
+base::Optional<::media::MediaKeys::SessionType> ToMediaKeysSessionType(
+    pb::MediaKeysSessionType value);
+base::Optional<pb::MediaKeysSessionType> ToProtoMediaKeysSessionType(
+    ::media::MediaKeys::SessionType value);
+
+base::Optional<::media::EmeInitDataType> ToMediaEmeInitDataType(
+    pb::CdmCreateSessionAndGenerateRequest::EmeInitDataType value);
+base::Optional<pb::CdmCreateSessionAndGenerateRequest::EmeInitDataType>
+ToProtoMediaEmeInitDataType(::media::EmeInitDataType value);
+
+base::Optional<::media::DemuxerStream::Status> ToDemuxerStreamStatus(
+    pb::DemuxerStreamReadUntilCallback::Status value);
+base::Optional<pb::DemuxerStreamReadUntilCallback::Status>
+ToProtoToDemuxerStreamStatus(::media::DemuxerStream::Status value);
+
+}  // namespace remoting
+}  // namespace media
+
+#endif  // MEDIA_REMOTING_RPC_PROTO_ENUM_UTILS_H_