Define remote playback proto buffer

media/remoting/rpc/proto_utils.h

Index: media/remoting/rpc/proto_utils.h
diff --git a/media/remoting/rpc/proto_utils.h b/media/remoting/rpc/proto_utils.h
new file mode 100644
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+++ b/media/remoting/rpc/proto_utils.h
@@ -0,0 +1,137 @@
+// 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_UTILS_H_
+#define MEDIA_REMOTING_RPC_PROTO_UTILS_H_
+
+#include <cstdint>
+#include <string>
+#include <vector>
+
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "media/base/audio_decoder_config.h"
+#include "media/base/cdm_config.h"
+#include "media/base/cdm_key_information.h"
+#include "media/base/decoder_buffer.h"
+#include "media/base/demuxer_stream.h"
+#include "media/base/eme_constants.h"
+#include "media/base/media_keys.h"
+#include "media/base/pipeline_status.h"
+#include "media/base/video_decoder_config.h"
+#include "media/remoting/remoting_rpc_message.pb.h"
+
+namespace media {
+namespace remoting {
+
+class CdmPromiseResult;
+
+// Predefined invalid handle value RPC message.
+constexpr int kInvalidHandle = -1;
+
+// Predefined handle value for RPC messages related to initialization.
+constexpr int kReceiverHandle = 0;
+
+// Utility class to convert data between ::media::DecoderBuffer and byte array.
+// It is to serialize ::media::DecoderBuffer structure except for actual data
+// into pb::DecoderBuffer followed by byte array of decoder buffer. The reason
+// data is not part of proto buffer because it would cost unnecessary time to
+// wait for whole proto received before conversion given the fact that decoder
+// buffer data can vary from hundred bytes to 3~5MB. Also, it would costs extra
+// CPU to sirealize/de-serialize decoder buffer which is encoded and encrypted
+// as wire format for data transmission.
+//
+// DecoderBufferSegment {
+//  // Payload version. Default value is 0.
+//  u8 payload_version;
+//
+//  // Length of pb::DecoderBuffer (protobuf-encoded of ::media::DecoderBuffer
+//                   except for data).
+//  u16 buffer_segment_size;
+//  // pb::DecoderBuffer.
+//  u8[buffer_segment_size] buffer_segment;
+//
+//  // Length of data in media::DecoderBuffer.
+//  u32 data_buffer_size;
+//  // media::DecoderBuffer data.
+//  u8[data_buffer_size] data_buffer;
+//};
+
+// Converts DecoderBufferSegment into byte array.
+std::vector<uint8_t> DecoderBufferToByteArray(
+    const scoped_refptr<::media::DecoderBuffer>& decoder_buffer);
+
+// Converts byte array into DecoderBufferSegment.
+scoped_refptr<::media::DecoderBuffer> ByteArrayToDecoderBuffer(
+    const uint8_t* data,
+    uint32_t size);
+
+// Data type conversion between ::media::AudioDecoderConfig and proto buffer.
+void ConvertAudioDecoderConfigToProto(
+    const ::media::AudioDecoderConfig& audio_config,
+    pb::AudioDecoderConfig* audio_message);
+bool ConvertProtoToAudioDecoderConfig(
+    const pb::AudioDecoderConfig& audio_message,
+    ::media::AudioDecoderConfig* audio_config);
+
+// Data type conversion between ::media::VideoDecoderConfig and proto buffer.
+void ConvertVideoDecoderConfigToProto(
+    const ::media::VideoDecoderConfig& video_config,
+    pb::VideoDecoderConfig* video_message);
+bool ConvertProtoToVideoDecoderConfig(
+    const pb::VideoDecoderConfig& video_message,
+    ::media::VideoDecoderConfig* video_config);
+
+// Data type conversion between ::media::CdmKeysInfo and proto buffer.
+void ConvertCdmKeyInfoToProto(
+    const ::media::CdmKeysInfo& keys_information,
+    pb::CdmClientOnSessionKeysChange* key_change_message);
+void ConvertProtoToCdmKeyInfo(
+    const pb::CdmClientOnSessionKeysChange keychange_message,
+    CdmKeysInfo* key_information);
+
+// Data type conversion between CdmPromiseResult and proto buffer.
+void ConvertCdmPromiseToProto(const CdmPromiseResult& result,
+                              pb::CdmPromise* promise_message);
+void ConvertCdmPromiseWithSessionIdToProto(const CdmPromiseResult& result,
+                                           const std::string& session_id,
+                                           pb::CdmPromise* promise_message);
+void ConvertCdmPromiseWithCdmIdToProto(const CdmPromiseResult& result,
+                                       int cdm_id,
+                                       pb::CdmPromise* promise_message);
+bool ConvertProtoToCdmPromise(const pb::CdmPromise& promise_message,
+                              CdmPromiseResult* result);
+bool ConvertProtoToCdmPromiseWithCdmIdSessionId(const pb::RpcMessage& message,
+                                                CdmPromiseResult* result,
+                                                int* cdm_id,
+                                                std::string* session_id);
+
+//==================================================================
+class CdmPromiseResult {
+ public:
+  CdmPromiseResult();
+  CdmPromiseResult(::media::MediaKeys::Exception exception,
+                   uint32_t system_code,
+                   std::string error_message);
+  CdmPromiseResult(const CdmPromiseResult& other);
+  ~CdmPromiseResult();
+
+  static CdmPromiseResult SuccessResult();
+
+  bool success() const { return success_; }
+  ::media::MediaKeys::Exception exception() const { return exception_; }
+  uint32_t system_code() const { return system_code_; }
+  const std::string& error_message() const { return error_message_; }
+
+ private:
+  bool success_;
+  ::media::MediaKeys::Exception exception_;
+  uint32_t system_code_;
+  std::string error_message_;
+};
+
+}  // namespace remoting
+}  // namespace media
+
+#endif  // MEDIA_REMOTING_RPC_PROTO_UTILS_H_