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1 /* | 1 /* |
2 * Copyright (C) 2013 Google Inc. All rights reserved. | 2 * Copyright (C) 2013 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 are | 5 * modification, are permitted provided that the following conditions are |
6 * met: | 6 * met: |
7 * | 7 * |
8 * * Redistributions of source code must retain the above copyright | 8 * * 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 * * Redistributions in binary form must reproduce the above | 10 * * Redistributions in binary form must reproduce the above |
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55 void reset(); | 55 void reset(); |
56 | 56 |
57 // Latency based on the source sample-rate. | 57 // Latency based on the source sample-rate. |
58 size_t latencyFrames() const; | 58 size_t latencyFrames() const; |
59 | 59 |
60 private: | 60 private: |
61 enum { DefaultKernelSize = 128 }; | 61 enum { DefaultKernelSize = 128 }; |
62 | 62 |
63 size_t m_inputBlockSize; | 63 size_t m_inputBlockSize; |
64 | 64 |
65 // Computes ideal band-limited filter coefficients to sample in between each s
ource sample-frame. | 65 // Computes ideal band-limited filter coefficients to sample in between each |
66 // This filter will be used to compute the odd sample-frames of the output. | 66 // source sample-frame. This filter will be used to compute the odd |
| 67 // sample-frames of the output. |
67 void initializeKernel(); | 68 void initializeKernel(); |
68 AudioFloatArray m_kernel; | 69 AudioFloatArray m_kernel; |
69 | 70 |
70 // Computes the odd sample-frames of the output. | 71 // Computes the odd sample-frames of the output. |
71 DirectConvolver m_convolver; | 72 DirectConvolver m_convolver; |
72 | 73 |
73 AudioFloatArray m_tempBuffer; | 74 AudioFloatArray m_tempBuffer; |
74 | 75 |
75 // Delay line for generating the even sample-frames of the output. | 76 // Delay line for generating the even sample-frames of the output. |
76 // The source samples are delayed exactly to match the linear phase delay of t
he FIR filter (convolution) | 77 // The source samples are delayed exactly to match the linear phase delay of |
77 // used to generate the odd sample-frames of the output. | 78 // the FIR filter (convolution) used to generate the odd sample-frames of the |
| 79 // output. |
78 AudioFloatArray m_inputBuffer; | 80 AudioFloatArray m_inputBuffer; |
79 }; | 81 }; |
80 | 82 |
81 } // namespace blink | 83 } // namespace blink |
82 | 84 |
83 #endif // UpSampler_h | 85 #endif // UpSampler_h |
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