Introduce shared_memory_support media target for PPAPI

media/audio/shared_memory_util.h

+// 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

[scherkus (not reviewing), 2012/08/14 19:27:33]

don't indent OR even better just one-line this

[DaleCurtis, 2012/08/15 01:11:14]

Done.

+};
+
+// Functions that handle data buffer passed between processes in the shared
+// memory. Called on both IPC sides.
+
+MEDIA_EXPORT uint32 TotalSharedMemorySizeInBytes(uint32 packet_size);
+MEDIA_EXPORT uint32 PacketSizeSizeInBytes(uint32 shared_memory_created_size);
+MEDIA_EXPORT uint32 GetActualDataSizeInBytes(base::SharedMemory* shared_memory,
+                                             uint32 shared_memory_size);
+MEDIA_EXPORT void SetActualDataSizeInBytes(base::SharedMemory* shared_memory,
+                                           uint32 shared_memory_size,
+                                           uint32 actual_data_size);
+MEDIA_EXPORT void SetUnknownDataSize(base::SharedMemory* shared_memory,
+                                     uint32 shared_memory_size);
+MEDIA_EXPORT bool IsUnknownDataSize(base::SharedMemory* shared_memory,
+                                    uint32 shared_memory_size);
+
+}  // namespace media
+
+#endif  // MEDIA_AUDIO_SHARED_MEMORY_UTIL_H_