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1 // Copyright 2016 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 MEDIA_CAPTURE_VIDEO_SHARED_MEMORY_BUFFER_HANDLE_H_ | |
6 #define MEDIA_CAPTURE_VIDEO_SHARED_MEMORY_BUFFER_HANDLE_H_ | |
7 | |
8 #include "media/capture/capture_export.h" | |
9 #include "media/capture/video/video_capture_buffer_handle.h" | |
10 | |
11 namespace media { | |
12 | |
13 // Provides access to memory-mapped shared memory without participating in the | |
14 // lifetime management of the memory. Instances are typically handed out by | |
15 // an instance of VideoCaptureDevice::Client as part of a | |
16 // VideoCaptureDevice::Client::Buffer, which contains a separate | |
17 // |access_permission| that guarantees that the memory stays alive. The buffers | |
18 // are typically managed by an instance of VideoCaptureBufferPool. | |
19 class CAPTURE_EXPORT SharedMemoryBufferHandle | |
20 : public VideoCaptureBufferHandle { | |
21 public: | |
22 explicit SharedMemoryBufferHandle(base::SharedMemory* shared_memory, | |
23 size_t mapped_size); | |
24 ~SharedMemoryBufferHandle() override; | |
25 | |
26 size_t mapped_size() const override; | |
27 uint8_t* data() const override; | |
28 const uint8_t* const_data() const override; | |
29 | |
30 private: | |
31 base::SharedMemory* const shared_memory_; | |
32 const size_t mapped_size_; | |
33 }; | |
34 | |
35 } // namespace media | |
36 | |
37 #endif // MEDIA_CAPTURE_VIDEO_SHARED_MEMORY_BUFFER_HANDLE_H_ | |
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