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| 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
| 4 | 4 |
| 5 #ifndef MEDIA_AUDIO_SHARED_MEMORY_UTIL_H_ | 5 #ifndef MEDIA_AUDIO_SHARED_MEMORY_UTIL_H_ |
| 6 #define MEDIA_AUDIO_SHARED_MEMORY_UTIL_H_ | 6 #define MEDIA_AUDIO_SHARED_MEMORY_UTIL_H_ |
| 7 | 7 |
| 8 #include "base/basictypes.h" | 8 #include "base/basictypes.h" |
| 9 #include "base/shared_memory.h" | 9 #include "base/shared_memory.h" |
| 10 #include "media/base/media_export.h" | 10 #include "media/base/media_export.h" |
| 11 | 11 |
| 12 namespace media { | 12 namespace media { |
| 13 | 13 |
| 14 // Value sent by the controller to the renderer in low-latency mode | 14 // Value sent by the controller to the renderer in low-latency mode |
| 15 // indicating that the stream is paused. | 15 // indicating that the stream is paused. |
| 16 enum { kPauseMark = -1 }; | 16 enum { kPauseMark = -1 }; |
| 17 | 17 |
| 18 // Functions that handle data buffer passed between processes in the shared | 18 // Functions that handle data buffer passed between processes in the shared |
| 19 // memory. Called on both IPC sides. These are necessary because the shared | 19 // memory. Called on both IPC sides. These are necessary because the shared |
| 20 // memory has a layout: the last word in the block is the data size in bytes. | 20 // memory has a layout: the last word in the block is the data size in bytes. |
| 21 | 21 |
| 22 MEDIA_EXPORT uint32 TotalSharedMemorySizeInBytes(uint32 packet_size); | 22 MEDIA_EXPORT uint32 TotalSharedMemorySizeInBytes(uint32 packet_size); |
| 23 MEDIA_EXPORT uint32 PacketSizeInBytes(uint32 shared_memory_created_size); | 23 MEDIA_EXPORT uint32 PacketSizeInBytes(uint32 shared_memory_created_size); |
| 24 MEDIA_EXPORT uint32 GetActualDataSizeInBytes(base::SharedMemory* shared_memory, | 24 MEDIA_EXPORT uint32 GetActualDataSizeInBytes(base::SharedMemory* shared_memory, |
| 25 uint32 shared_memory_size); | 25 uint32 packet_size); |
| 26 MEDIA_EXPORT void SetActualDataSizeInBytes(base::SharedMemory* shared_memory, | 26 MEDIA_EXPORT void SetActualDataSizeInBytes(base::SharedMemory* shared_memory, |
| 27 uint32 shared_memory_size, | 27 uint32 packet_size, |
| 28 uint32 actual_data_size); | 28 uint32 actual_data_size); |
| 29 MEDIA_EXPORT void SetActualDataSizeInBytes(void* shared_memory_ptr, | 29 MEDIA_EXPORT void SetActualDataSizeInBytes(void* shared_memory_ptr, |
| 30 uint32 shared_memory_size, | 30 uint32 packet_size, |
| 31 uint32 actual_data_size); | 31 uint32 actual_data_size); |
| 32 MEDIA_EXPORT void SetUnknownDataSize(base::SharedMemory* shared_memory, | 32 MEDIA_EXPORT void SetUnknownDataSize(base::SharedMemory* shared_memory, |
| 33 uint32 shared_memory_size); | 33 uint32 packet_size); |
| 34 MEDIA_EXPORT bool IsUnknownDataSize(base::SharedMemory* shared_memory, | 34 MEDIA_EXPORT bool IsUnknownDataSize(base::SharedMemory* shared_memory, |
| 35 uint32 shared_memory_size); | 35 uint32 packet_size); |
| 36 | 36 |
| 37 } // namespace media | 37 } // namespace media |
| 38 | 38 |
| 39 #endif // MEDIA_AUDIO_SHARED_MEMORY_UTIL_H_ | 39 #endif // MEDIA_AUDIO_SHARED_MEMORY_UTIL_H_ |
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