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1 /* | 1 /* |
2 * Copyright (C) 2011 Google Inc. All rights reserved. | 2 * Copyright (C) 2011 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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27 */ | 27 */ |
28 | 28 |
29 #include "config.h" | 29 #include "config.h" |
30 | 30 |
31 #if ENABLE(WEB_AUDIO) | 31 #if ENABLE(WEB_AUDIO) |
32 | 32 |
33 #include "platform/audio/ZeroPole.h" | 33 #include "platform/audio/ZeroPole.h" |
34 | 34 |
35 #include "platform/audio/DenormalDisabler.h" | 35 #include "platform/audio/DenormalDisabler.h" |
36 | 36 |
37 namespace WebCore { | 37 namespace blink { |
38 | 38 |
39 void ZeroPole::process(const float *source, float *destination, unsigned framesT
oProcess) | 39 void ZeroPole::process(const float *source, float *destination, unsigned framesT
oProcess) |
40 { | 40 { |
41 float zero = m_zero; | 41 float zero = m_zero; |
42 float pole = m_pole; | 42 float pole = m_pole; |
43 | 43 |
44 // Gain compensation to make 0dB @ 0Hz | 44 // Gain compensation to make 0dB @ 0Hz |
45 const float k1 = 1 / (1 - zero); | 45 const float k1 = 1 / (1 - zero); |
46 const float k2 = 1 - pole; | 46 const float k2 = 1 - pole; |
47 | 47 |
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62 | 62 |
63 *destination++ = output2; | 63 *destination++ = output2; |
64 } | 64 } |
65 | 65 |
66 // Locals to member variables. Flush denormals here so we don't | 66 // Locals to member variables. Flush denormals here so we don't |
67 // slow down the inner loop above. | 67 // slow down the inner loop above. |
68 m_lastX = DenormalDisabler::flushDenormalFloatToZero(lastX); | 68 m_lastX = DenormalDisabler::flushDenormalFloatToZero(lastX); |
69 m_lastY = DenormalDisabler::flushDenormalFloatToZero(lastY); | 69 m_lastY = DenormalDisabler::flushDenormalFloatToZero(lastY); |
70 } | 70 } |
71 | 71 |
72 } // namespace WebCore | 72 } // namespace blink |
73 | 73 |
74 #endif // ENABLE(WEB_AUDIO) | 74 #endif // ENABLE(WEB_AUDIO) |
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