diff options
Diffstat (limited to 'chromium/media/audio/shared_memory_util.cc')
-rw-r--r-- | chromium/media/audio/shared_memory_util.cc | 72 |
1 files changed, 0 insertions, 72 deletions
diff --git a/chromium/media/audio/shared_memory_util.cc b/chromium/media/audio/shared_memory_util.cc deleted file mode 100644 index 523cdb9646c..00000000000 --- a/chromium/media/audio/shared_memory_util.cc +++ /dev/null @@ -1,72 +0,0 @@ -// Copyright (c) 2012 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 "media/audio/shared_memory_util.h" - -#include <algorithm> - -#include "base/atomicops.h" -#include "base/logging.h" - -using base::subtle::Atomic32; - -static const uint32 kUnknownDataSize = static_cast<uint32>(-1); - -namespace media { - -uint32 TotalSharedMemorySizeInBytes(uint32 packet_size) { - // Need to reserve extra 4 bytes for size of data. - return packet_size + sizeof(Atomic32); -} - -uint32 PacketSizeInBytes(uint32 shared_memory_created_size) { - return shared_memory_created_size - sizeof(Atomic32); -} - -uint32 GetActualDataSizeInBytes(base::SharedMemory* shared_memory, - uint32 packet_size) { - char* ptr = static_cast<char*>(shared_memory->memory()) + packet_size; - DCHECK_EQ(0u, reinterpret_cast<size_t>(ptr) & 3); - - // Actual data size stored at the end of the buffer. - uint32 actual_data_size = - base::subtle::Acquire_Load(reinterpret_cast<volatile Atomic32*>(ptr)); - return std::min(actual_data_size, packet_size); -} - -void SetActualDataSizeInBytes(void* shared_memory_ptr, - uint32 packet_size, - uint32 actual_data_size) { - char* ptr = static_cast<char*>(shared_memory_ptr) + packet_size; - DCHECK_EQ(0u, reinterpret_cast<size_t>(ptr) & 3); - - // Set actual data size at the end of the buffer. - base::subtle::Release_Store(reinterpret_cast<volatile Atomic32*>(ptr), - actual_data_size); -} - -void SetActualDataSizeInBytes(base::SharedMemory* shared_memory, - uint32 packet_size, - uint32 actual_data_size) { - SetActualDataSizeInBytes(shared_memory->memory(), - packet_size, actual_data_size); -} - -void SetUnknownDataSize(base::SharedMemory* shared_memory, - uint32 packet_size) { - SetActualDataSizeInBytes(shared_memory, packet_size, kUnknownDataSize); -} - -bool IsUnknownDataSize(base::SharedMemory* shared_memory, - uint32 packet_size) { - char* ptr = static_cast<char*>(shared_memory->memory()) + packet_size; - DCHECK_EQ(0u, reinterpret_cast<size_t>(ptr) & 3); - - // Actual data size stored at the end of the buffer. - uint32 actual_data_size = - base::subtle::Acquire_Load(reinterpret_cast<volatile Atomic32*>(ptr)); - return actual_data_size == kUnknownDataSize; -} - -} // namespace media |