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1 /* | 1 /* |
2 * Copyright (C) 2010, Google Inc. All rights reserved. | 2 * Copyright (C) 2010, 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 * 1. Redistributions of source code must retain the above copyright | 7 * 1. Redistributions of source code must retain the above copyright |
8 * notice, this list of conditions and the following disclaimer. | 8 * notice, this list of conditions and the following disclaimer. |
9 * 2. Redistributions in binary form must reproduce the above copyright | 9 * 2. Redistributions in binary form must reproduce the above copyright |
10 * notice, this list of conditions and the following disclaimer in the | 10 * notice, this list of conditions and the following disclaimer in the |
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55 | 55 |
56 virtual double tailTime() const OVERRIDE; | 56 virtual double tailTime() const OVERRIDE; |
57 virtual double latencyTime() const OVERRIDE; | 57 virtual double latencyTime() const OVERRIDE; |
58 | 58 |
59 protected: | 59 protected: |
60 Biquad m_biquad; | 60 Biquad m_biquad; |
61 BiquadProcessor* biquadProcessor() { return static_cast<BiquadProcessor*>(pr
ocessor()); } | 61 BiquadProcessor* biquadProcessor() { return static_cast<BiquadProcessor*>(pr
ocessor()); } |
62 | 62 |
63 // To prevent audio glitches when parameters are changed, | 63 // To prevent audio glitches when parameters are changed, |
64 // dezippering is used to slowly change the parameters. | 64 // dezippering is used to slowly change the parameters. |
65 // |useSmoothing| implies that we want to update using the | 65 void updateCoefficientsIfNecessary(); |
66 // smoothed values. Otherwise the final target values are | 66 // Update the biquad cofficients with the given parameters |
67 // used. If |forceUpdate| is true, we update the coefficients even | 67 void updateCoefficients(double frequency, double Q, double gain, double detu
ne); |
68 // if they are not dirty. (Used when computing the frequency | 68 |
69 // response.) | 69 private: |
70 void updateCoefficientsIfNecessary(bool useSmoothing, bool forceUpdate); | 70 // Synchronize process() with getting and setting the filter coefficients. |
| 71 mutable Mutex m_processLock; |
71 }; | 72 }; |
72 | 73 |
73 } // namespace WebCore | 74 } // namespace WebCore |
74 | 75 |
75 #endif // BiquadDSPKernel_h | 76 #endif // BiquadDSPKernel_h |
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