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1 /* | 1 /* |
2 * Copyright (C) 2012 Google Inc. All rights reserved. | 2 * Copyright (C) 2012 Google Inc. All rights reserved. |
3 * | 3 * |
4 * Redistribution and use in source and binary forms, with or without | 4 * Redistribution and use in source and binary forms, with or without |
5 * modification, are permitted provided that the following conditions | 5 * modification, are permitted provided that the following conditions |
6 * are met: | 6 * are met: |
7 * | 7 * |
8 * 1. Redistributions of source code must retain the above copyright | 8 * 1. Redistributions of source code must retain the above copyright |
9 * notice, this list of conditions and the following disclaimer. | 9 * notice, this list of conditions and the following disclaimer. |
10 * 2. Redistributions in binary form must reproduce the above copyright | 10 * 2. Redistributions in binary form must reproduce the above copyright |
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26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 */ | 27 */ |
28 | 28 |
29 #ifndef AudioPullFIFO_h | 29 #ifndef AudioPullFIFO_h |
30 #define AudioPullFIFO_h | 30 #define AudioPullFIFO_h |
31 | 31 |
32 #include "platform/audio/AudioBus.h" | 32 #include "platform/audio/AudioBus.h" |
33 #include "platform/audio/AudioFIFO.h" | 33 #include "platform/audio/AudioFIFO.h" |
34 #include "platform/audio/AudioSourceProvider.h" | 34 #include "platform/audio/AudioSourceProvider.h" |
35 | 35 |
36 namespace WebCore { | 36 namespace blink { |
37 | 37 |
38 // A FIFO (First In First Out) buffer to handle mismatches in buffer sizes betwe
en a provider and | 38 // A FIFO (First In First Out) buffer to handle mismatches in buffer sizes betwe
en a provider and |
39 // receiver. The receiver will "pull" data from this FIFO. If data is already av
ailable in the | 39 // receiver. The receiver will "pull" data from this FIFO. If data is already av
ailable in the |
40 // FIFO, it is provided to the receiver. If insufficient data is available to sa
tisfy the request, | 40 // FIFO, it is provided to the receiver. If insufficient data is available to sa
tisfy the request, |
41 // the FIFO will ask the provider for more data when necessary to fulfill a requ
est. Contrast this | 41 // the FIFO will ask the provider for more data when necessary to fulfill a requ
est. Contrast this |
42 // with a "push" FIFO, where the sender pushes data to the FIFO which will itsel
f push the data to | 42 // with a "push" FIFO, where the sender pushes data to the FIFO which will itsel
f push the data to |
43 // the receiver when the FIFO is full. | 43 // the receiver when the FIFO is full. |
44 class PLATFORM_EXPORT AudioPullFIFO { | 44 class PLATFORM_EXPORT AudioPullFIFO { |
45 public: | 45 public: |
46 // Create a FIFO that gets data from |provider|. The FIFO will be large enou
gh to hold | 46 // Create a FIFO that gets data from |provider|. The FIFO will be large enou
gh to hold |
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62 // The actual FIFO | 62 // The actual FIFO |
63 AudioFIFO m_fifo; | 63 AudioFIFO m_fifo; |
64 | 64 |
65 // Number of frames of data that the provider will produce per call. | 65 // Number of frames of data that the provider will produce per call. |
66 unsigned m_providerSize; | 66 unsigned m_providerSize; |
67 | 67 |
68 // Temporary workspace to hold the data from the provider. | 68 // Temporary workspace to hold the data from the provider. |
69 RefPtr<AudioBus> m_tempBus; | 69 RefPtr<AudioBus> m_tempBus; |
70 }; | 70 }; |
71 | 71 |
72 } // namespace WebCore | 72 } // namespace blink |
73 | 73 |
74 #endif // AudioPullFIFO.h | 74 #endif // AudioPullFIFO.h |
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