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// 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.
#ifndef MEDIA_AUDIO_SHARED_MEMORY_UTIL_H_
#define MEDIA_AUDIO_SHARED_MEMORY_UTIL_H_
#include "base/basictypes.h"
#include "base/shared_memory.h"
#include "media/base/media_export.h"
namespace media {
// Value sent by the controller to the renderer in low-latency mode
// indicating that the stream is paused.
enum { kPauseMark = -1 };
// Functions that handle data buffer passed between processes in the shared
// memory. Called on both IPC sides. These are necessary because the shared
// memory has a layout: the last word in the block is the data size in bytes.
MEDIA_EXPORT uint32 TotalSharedMemorySizeInBytes(uint32 packet_size);
MEDIA_EXPORT uint32 PacketSizeInBytes(uint32 shared_memory_created_size);
MEDIA_EXPORT uint32 GetActualDataSizeInBytes(base::SharedMemory* shared_memory,
uint32 packet_size);
MEDIA_EXPORT void SetActualDataSizeInBytes(base::SharedMemory* shared_memory,
uint32 packet_size,
uint32 actual_data_size);
MEDIA_EXPORT void SetActualDataSizeInBytes(void* shared_memory_ptr,
uint32 packet_size,
uint32 actual_data_size);
MEDIA_EXPORT void SetUnknownDataSize(base::SharedMemory* shared_memory,
uint32 packet_size);
MEDIA_EXPORT bool IsUnknownDataSize(base::SharedMemory* shared_memory,
uint32 packet_size);
} // namespace media
#endif // MEDIA_AUDIO_SHARED_MEMORY_UTIL_H_
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