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// 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 "shared_memory_region.h"
namespace media {
SharedMemoryRegion::SharedMemoryRegion(const base::SharedMemoryHandle& handle,
off_t offset,
size_t size,
bool read_only)
: shm_(handle, read_only),
offset_(offset),
size_(size),
alignment_size_(offset % base::SysInfo::VMAllocationGranularity()) {
DCHECK_GE(offset_, 0) << "Invalid offset: " << offset_;
}
SharedMemoryRegion::SharedMemoryRegion(const BitstreamBuffer& bitstream_buffer,
bool read_only)
: SharedMemoryRegion(bitstream_buffer.handle(),
bitstream_buffer.offset(),
bitstream_buffer.size(),
read_only) {}
bool SharedMemoryRegion::Map() {
if (offset_ < 0) {
DVLOG(1) << "Invalid offset: " << offset_;
return false;
}
return shm_.MapAt(offset_ - alignment_size_, size_ + alignment_size_);
}
void* SharedMemoryRegion::memory() {
int8_t* addr = reinterpret_cast<int8_t*>(shm_.memory());
return addr ? addr + alignment_size_ : nullptr;
}
} // namespace media
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