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| 1 // Copyright (c) 2015 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 #include "base/sys_info.h" |
| 6 #include "content/common/gpu/media/shared_memory_region.h" |
| 7 |
| 8 namespace content { |
| 9 |
| 10 SharedMemoryRegion::SharedMemoryRegion(const base::SharedMemoryHandle& handle, |
| 11 off_t offset, |
| 12 size_t size, |
| 13 bool read_only) |
| 14 : shm_(handle, read_only), |
| 15 offset_(offset), |
| 16 size_(size), |
| 17 alignment_size_(offset % base::SysInfo::VMAllocationGranularity()) { |
| 18 DCHECK_GE(offset_, 0) << "Invalid offset: " << offset_; |
| 19 } |
| 20 |
| 21 SharedMemoryRegion::SharedMemoryRegion( |
| 22 const media::BitstreamBuffer& bitstream_buffer, |
| 23 bool read_only) |
| 24 : SharedMemoryRegion(bitstream_buffer.handle(), |
| 25 bitstream_buffer.offset(), |
| 26 bitstream_buffer.size(), |
| 27 read_only) {} |
| 28 |
| 29 bool SharedMemoryRegion::Map() { |
| 30 if (offset_ < 0) { |
| 31 DVLOG(1) << "Invalid offset: " << offset_; |
| 32 return false; |
| 33 } |
| 34 return shm_.MapAt(offset_ - alignment_size_, size_ + alignment_size_); |
| 35 } |
| 36 |
| 37 void* SharedMemoryRegion::memory() { |
| 38 int8_t* addr = reinterpret_cast<int8_t*>(shm_.memory()); |
| 39 return addr ? addr + alignment_size_ : nullptr; |
| 40 } |
| 41 |
| 42 } // namespace content |
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