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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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