Index: content/common/gpu/media/shared_memory_region.cc |
diff --git a/content/common/gpu/media/shared_memory_region.cc b/content/common/gpu/media/shared_memory_region.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..5dc0b369690ba04170ffcf6a82e34b62c118aefe |
--- /dev/null |
+++ b/content/common/gpu/media/shared_memory_region.cc |
@@ -0,0 +1,35 @@ |
+// 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. |
+ |
+#include "base/sys_info.h" |
+#include "content/common/gpu/media/shared_memory_region.h" |
+ |
+namespace content { |
+ |
+SharedMemoryRegion::SharedMemoryRegion(const base::SharedMemoryHandle& handle, |
+ off_t offset, |
+ size_t size, |
+ bool read_only) |
+ : shm_(handle, read_only), offset_(offset), size_(size) {} |
+ |
+SharedMemoryRegion::SharedMemoryRegion( |
+ const media::BitstreamBuffer& bitstream_buffer, |
+ bool read_only) |
+ : SharedMemoryRegion(bitstream_buffer.handle(), |
+ bitstream_buffer.offset(), |
+ bitstream_buffer.size(), |
+ read_only) {} |
+ |
+bool SharedMemoryRegion::Map() { |
+ off_t mask = base::SysInfo::VMAllocationGranularity() - 1; |
Pawel Osciak
2015/12/31 02:05:53
This assumes granularity is a power of 2 (which no
Owen Lin
2016/01/04 08:54:17
Done.
|
+ return shm_.MapAt((offset_ & ~mask), size_ + (offset_ & mask)); |
Pawel Osciak
2015/12/31 02:05:53
Perhaps we could calculate new offset here (or eve
Owen Lin
2016/01/04 08:54:17
Done.
|
+} |
+ |
+void* SharedMemoryRegion::memory() { |
+ off_t mask = base::SysInfo::VMAllocationGranularity() - 1; |
+ int8_t* addr = reinterpret_cast<int8_t*>(shm_.memory()); |
+ return addr ? addr + (offset_ & mask) : nullptr; |
+} |
+ |
+} // namespace content |