| // 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_ |
