Index: content/common/gpu/media/shared_memory_region.h |
diff --git a/content/common/gpu/media/shared_memory_region.h b/content/common/gpu/media/shared_memory_region.h |
new file mode 100644 |
index 0000000000000000000000000000000000000000..61e88d172516340487c3dabbd204d8068b3be83d |
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+++ b/content/common/gpu/media/shared_memory_region.h |
@@ -0,0 +1,51 @@ |
+// Copyright (c) 2015 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 CONTENT_COMMON_GPU_MEDIA_SHARED_MEMORY_REGION_H_ |
+#define CONTENT_COMMON_GPU_MEDIA_SHARED_MEMORY_REGION_H_ |
+ |
+#include "base/memory/shared_memory.h" |
+#include "media/base/bitstream_buffer.h" |
+ |
+namespace content { |
+ |
+// Helper class to access a region of a SharedMemory. |
+class SharedMemoryRegion { |
+ public: |
+ // Creates a SharedMemoryRegion. |
+ // The mapped memory region begins at |offset| bytes from the start of the |
+ // shared memory and the length is |size|. It will take the ownership of |
+ // the |handle| and release the resource when being destroyed. |
+ SharedMemoryRegion(const base::SharedMemoryHandle& handle, |
+ off_t offset, |
+ size_t size, |
+ bool read_only); |
+ |
+ // Creates a SharedMemoryRegion from the given |bistream_buffer|. |
+ SharedMemoryRegion(const media::BitstreamBuffer& bitstream_buffer, |
+ bool read_only); |
+ |
+ // Maps the shared memory into the caller's address space. |
+ // Return true on success, false otherwise. |
+ bool Map(); |
+ |
+ // Gets a pointer to the mapped region if it has been mapped via Map(). |
+ // Returns |nullptr| if it is not mapped. The returned pointer points |
+ // to the memory at the offset previously passed to the constructor. |
+ void* memory(); |
+ |
+ size_t size() const { return size_; } |
+ |
+ private: |
+ base::SharedMemory shm_; |
+ off_t offset_; |
+ size_t size_; |
+ size_t alignment_size_; |
+ |
+ DISALLOW_COPY_AND_ASSIGN(SharedMemoryRegion); |
+}; |
+ |
+} // namespace content |
+ |
+#endif // CONTENT_COMMON_GPU_MEDIA_SHARED_MEMORY_REGION_H_ |