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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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