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1 // Copyright 2013 The Chromium Authors. All rights reserved. | 1 // Copyright 2013 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_BASE_AUDIO_HASH_H_ | 5 #ifndef MEDIA_BASE_AUDIO_HASH_H_ |
6 #define MEDIA_BASE_AUDIO_HASH_H_ | 6 #define MEDIA_BASE_AUDIO_HASH_H_ |
7 | 7 |
8 #include <string> | 8 #include <string> |
9 | 9 |
| 10 #include "base/macros.h" |
10 #include "base/strings/string_piece.h" | 11 #include "base/strings/string_piece.h" |
11 #include "media/base/media_export.h" | 12 #include "media/base/media_export.h" |
12 | 13 |
13 namespace media { | 14 namespace media { |
14 | 15 |
15 class AudioBus; | 16 class AudioBus; |
16 | 17 |
17 // Computes a running hash for a series of AudioBus objects. The hash is the | 18 // Computes a running hash for a series of AudioBus objects. The hash is the |
18 // sum of each sample bucketed based on the frame index, channel number, and | 19 // sum of each sample bucketed based on the frame index, channel number, and |
19 // current hash count. The hash was designed with two properties in mind: | 20 // current hash count. The hash was designed with two properties in mind: |
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48 // The total number of samples processed per channel. Uses a uint32_t instead | 49 // The total number of samples processed per channel. Uses a uint32_t instead |
49 // of size_t so overflows on 64-bit and 32-bit machines are equivalent. | 50 // of size_t so overflows on 64-bit and 32-bit machines are equivalent. |
50 uint32_t sample_count_; | 51 uint32_t sample_count_; |
51 | 52 |
52 DISALLOW_COPY_AND_ASSIGN(AudioHash); | 53 DISALLOW_COPY_AND_ASSIGN(AudioHash); |
53 }; | 54 }; |
54 | 55 |
55 } // namespace media | 56 } // namespace media |
56 | 57 |
57 #endif // MEDIA_BASE_AUDIO_HASH_H_ | 58 #endif // MEDIA_BASE_AUDIO_HASH_H_ |
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