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| 1 // Copyright 2014 The Chromium Authors. All rights reserved. | 1 // Copyright 2014 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
| 4 | 4 |
| 5 #ifndef CHROMECAST_MEDIA_CMA_IPC_MEDIA_MESSAGE_H_ | 5 #ifndef CHROMECAST_MEDIA_CMA_IPC_MEDIA_MESSAGE_H_ |
| 6 #define CHROMECAST_MEDIA_CMA_IPC_MEDIA_MESSAGE_H_ | 6 #define CHROMECAST_MEDIA_CMA_IPC_MEDIA_MESSAGE_H_ |
| 7 | 7 |
| 8 #include <stddef.h> | 8 #include <stddef.h> |
| 9 #include <stdint.h> | 9 #include <stdint.h> |
| 10 | 10 |
| 11 #include <memory> |
| 12 |
| 11 #include "base/callback.h" | 13 #include "base/callback.h" |
| 12 #include "base/macros.h" | 14 #include "base/macros.h" |
| 13 #include "base/memory/scoped_ptr.h" | |
| 14 | 15 |
| 15 namespace chromecast { | 16 namespace chromecast { |
| 16 namespace media { | 17 namespace media { |
| 17 class MediaMemoryChunk; | 18 class MediaMemoryChunk; |
| 18 | 19 |
| 19 // MediaMessage - | 20 // MediaMessage - |
| 20 // Represents a media message, including: | 21 // Represents a media message, including: |
| 21 // - a message header that gives for example the message size or its type, | 22 // - a message header that gives for example the message size or its type, |
| 22 // - the content of the message, | 23 // - the content of the message, |
| 23 // - and some possible padding if the content does not occupy the whole | 24 // - and some possible padding if the content does not occupy the whole |
| 24 // reserved space. | 25 // reserved space. |
| 25 // | 26 // |
| 26 class MediaMessage { | 27 class MediaMessage { |
| 27 public: | 28 public: |
| 28 // Memory allocator: given a number of bytes to allocate, | 29 // Memory allocator: given a number of bytes to allocate, |
| 29 // return the pointer to the allocated block if successful | 30 // return the pointer to the allocated block if successful |
| 30 // or NULL if allocation failed. | 31 // or NULL if allocation failed. |
| 31 typedef base::Callback<scoped_ptr<MediaMemoryChunk>(size_t)> | 32 typedef base::Callback<std::unique_ptr<MediaMemoryChunk>(size_t)> |
| 32 MemoryAllocatorCB; | 33 MemoryAllocatorCB; |
| 33 | 34 |
| 34 // Creates a message with no associated memory for its content, i.e. | 35 // Creates a message with no associated memory for its content, i.e. |
| 35 // each write on this message is a dummy operation. | 36 // each write on this message is a dummy operation. |
| 36 // This type of message can be useful to calculate first the size of the | 37 // This type of message can be useful to calculate first the size of the |
| 37 // message, before allocating the real message. | 38 // message, before allocating the real message. |
| 38 static scoped_ptr<MediaMessage> CreateDummyMessage(uint32_t type); | 39 static std::unique_ptr<MediaMessage> CreateDummyMessage(uint32_t type); |
| 39 | 40 |
| 40 // Creates a message with a capacity of at least |msg_content_capacity| | 41 // Creates a message with a capacity of at least |msg_content_capacity| |
| 41 // bytes. The actual content size can be smaller than its capacity. | 42 // bytes. The actual content size can be smaller than its capacity. |
| 42 // The message can be populated with some Write functions. | 43 // The message can be populated with some Write functions. |
| 43 static scoped_ptr<MediaMessage> CreateMessage( | 44 static std::unique_ptr<MediaMessage> CreateMessage( |
| 44 uint32_t type, | 45 uint32_t type, |
| 45 const MemoryAllocatorCB& memory_allocator, | 46 const MemoryAllocatorCB& memory_allocator, |
| 46 size_t msg_content_capacity); | 47 size_t msg_content_capacity); |
| 47 | 48 |
| 48 // Creates a message of type |type| whose serialized structure is stored | 49 // Creates a message of type |type| whose serialized structure is stored |
| 49 // in |mem|. | 50 // in |mem|. |
| 50 static scoped_ptr<MediaMessage> CreateMessage( | 51 static std::unique_ptr<MediaMessage> CreateMessage( |
| 51 uint32_t type, | 52 uint32_t type, |
| 52 scoped_ptr<MediaMemoryChunk> mem); | 53 std::unique_ptr<MediaMemoryChunk> mem); |
| 53 | 54 |
| 54 // Creates a message from a memory area which already contains | 55 // Creates a message from a memory area which already contains |
| 55 // the serialized structure of the message. | 56 // the serialized structure of the message. |
| 56 // Only Read functions can be invoked on this type of message. | 57 // Only Read functions can be invoked on this type of message. |
| 57 static scoped_ptr<MediaMessage> MapMessage( | 58 static std::unique_ptr<MediaMessage> MapMessage( |
| 58 scoped_ptr<MediaMemoryChunk> mem); | 59 std::unique_ptr<MediaMemoryChunk> mem); |
| 59 | 60 |
| 60 // Return the minimum size of a message. | 61 // Return the minimum size of a message. |
| 61 static size_t minimum_msg_size() { | 62 static size_t minimum_msg_size() { |
| 62 return offsetof(SerializedMsg, content); | 63 return offsetof(SerializedMsg, content); |
| 63 } | 64 } |
| 64 | 65 |
| 65 ~MediaMessage(); | 66 ~MediaMessage(); |
| 66 | 67 |
| 67 // Indicate whether the underlying serialized structure of the message is | 68 // Indicate whether the underlying serialized structure of the message is |
| 68 // available. | 69 // available. |
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| 105 // and write it to |dst|. | 106 // and write it to |dst|. |
| 106 bool ReadBuffer(void* dst, size_t size); | 107 bool ReadBuffer(void* dst, size_t size); |
| 107 | 108 |
| 108 // Return a pointer to a buffer of size |size|. | 109 // Return a pointer to a buffer of size |size|. |
| 109 // Return NULL if not successful. | 110 // Return NULL if not successful. |
| 110 const void* GetBuffer(size_t size); | 111 const void* GetBuffer(size_t size); |
| 111 void* GetWritableBuffer(size_t size); | 112 void* GetWritableBuffer(size_t size); |
| 112 | 113 |
| 113 private: | 114 private: |
| 114 MediaMessage(uint32_t type, size_t msg_size); | 115 MediaMessage(uint32_t type, size_t msg_size); |
| 115 MediaMessage(uint32_t type, scoped_ptr<MediaMemoryChunk> memory); | 116 MediaMessage(uint32_t type, std::unique_ptr<MediaMemoryChunk> memory); |
| 116 MediaMessage(scoped_ptr<MediaMemoryChunk> memory); | 117 MediaMessage(std::unique_ptr<MediaMemoryChunk> memory); |
| 117 | 118 |
| 118 struct Header { | 119 struct Header { |
| 119 // Total size of the message (including both header & content). | 120 // Total size of the message (including both header & content). |
| 120 uint32_t size; | 121 uint32_t size; |
| 121 // Indicate the message type. | 122 // Indicate the message type. |
| 122 uint32_t type; | 123 uint32_t type; |
| 123 // Actual size of the content in the message. | 124 // Actual size of the content in the message. |
| 124 uint32_t content_size; | 125 uint32_t content_size; |
| 125 }; | 126 }; |
| 126 | 127 |
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| 144 // issues. | 145 // issues. |
| 145 SerializedMsg cached_msg_; | 146 SerializedMsg cached_msg_; |
| 146 Header* const cached_header_; | 147 Header* const cached_header_; |
| 147 | 148 |
| 148 SerializedMsg* msg_; | 149 SerializedMsg* msg_; |
| 149 SerializedMsg* msg_read_only_; | 150 SerializedMsg* msg_read_only_; |
| 150 | 151 |
| 151 // Memory allocated to store the underlying serialized structure into memory. | 152 // Memory allocated to store the underlying serialized structure into memory. |
| 152 // Note: a dummy message has no underlying serialized structure: | 153 // Note: a dummy message has no underlying serialized structure: |
| 153 // |mem_| is a null pointer in that case. | 154 // |mem_| is a null pointer in that case. |
| 154 scoped_ptr<MediaMemoryChunk> mem_; | 155 std::unique_ptr<MediaMemoryChunk> mem_; |
| 155 | 156 |
| 156 // Read iterator into the message. | 157 // Read iterator into the message. |
| 157 size_t rd_offset_; | 158 size_t rd_offset_; |
| 158 | 159 |
| 159 DISALLOW_COPY_AND_ASSIGN(MediaMessage); | 160 DISALLOW_COPY_AND_ASSIGN(MediaMessage); |
| 160 }; | 161 }; |
| 161 | 162 |
| 162 } // namespace media | 163 } // namespace media |
| 163 } // namespace chromecast | 164 } // namespace chromecast |
| 164 | 165 |
| 165 #endif | 166 #endif |
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