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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 | |
3 // found in the LICENSE file. | |
4 | |
5 #ifndef CHROMECAST_MEDIA_CMA_IPC_MEDIA_MEMORY_CHUNK_H_ | |
6 #define CHROMECAST_MEDIA_CMA_IPC_MEDIA_MEMORY_CHUNK_H_ | |
7 | |
8 #include <stddef.h> | |
9 | |
10 namespace chromecast { | |
11 namespace media { | |
12 | |
13 // MediaMemoryChunk represents a block of memory without doing any assumption | |
14 // about the type of memory (e.g. shared memory) nor about the underlying | |
15 // memory ownership. | |
16 // The block of memory can be invalidated under the cover (e.g. if the derived | |
17 // class does not own the underlying memory), | |
18 // in that case, MediaMemoryChunk::valid() will return false. | |
19 class MediaMemoryChunk { | |
20 public: | |
21 virtual ~MediaMemoryChunk(); | |
22 | |
23 // Returns the start of the block of memory. | |
24 virtual void* data() const = 0; | |
25 | |
26 // Returns the size of the block of memory. | |
27 virtual size_t size() const = 0; | |
28 | |
29 // Returns whether the underlying block of memory is valid. | |
30 // Since MediaMemoryChunk does not specify a memory ownership model, | |
31 // the underlying block of memory might be invalidated by a third party. | |
32 // In that case, valid() will return false. | |
33 virtual bool valid() const = 0; | |
34 }; | |
35 | |
36 } // namespace media | |
37 } // namespace chromecast | |
38 | |
39 #endif // CHROMECAST_MEDIA_CMA_IPC_MEDIA_MEMORY_CHUNK_H_ | |
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