// Copyright (c) 2015 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Note: ported from Chromium commit head: 60f9667
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#include "base/sys_info.h"
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#include "shared_memory_region.h"
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namespace media {
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SharedMemoryRegion::SharedMemoryRegion(const base::SharedMemoryHandle& handle,
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off_t offset,
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size_t size,
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bool read_only)
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: shm_(handle, read_only),
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offset_(offset),
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size_(size),
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alignment_size_(offset % base::SysInfo::VMAllocationGranularity()) {
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DCHECK_GE(offset_, 0) << "Invalid offset: " << offset_;
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}
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SharedMemoryRegion::SharedMemoryRegion(const BitstreamBuffer& bitstream_buffer,
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bool read_only)
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: SharedMemoryRegion(bitstream_buffer.handle(),
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bitstream_buffer.offset(),
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bitstream_buffer.size(),
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read_only) {}
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bool SharedMemoryRegion::Map() {
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if (offset_ < 0) {
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DVLOG(1) << "Invalid offset: " << offset_;
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return false;
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}
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return shm_.MapAt(offset_ - alignment_size_, size_ + alignment_size_);
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}
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void* SharedMemoryRegion::memory() {
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int8_t* addr = reinterpret_cast<int8_t*>(shm_.memory());
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return addr ? addr + alignment_size_ : nullptr;
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}
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} // namespace media
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