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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 * | 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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22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | 22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND | 23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | 24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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 Biquad_h | 29 #ifndef Biquad_h |
30 #define Biquad_h | 30 #define Biquad_h |
31 | 31 |
| 32 #include <sys/types.h> |
| 33 #include <complex> |
32 #include "platform/PlatformExport.h" | 34 #include "platform/PlatformExport.h" |
33 #include "platform/audio/AudioArray.h" | 35 #include "platform/audio/AudioArray.h" |
34 #include "wtf/Allocator.h" | 36 #include "wtf/Allocator.h" |
35 #include <complex> | |
36 #include <sys/types.h> | |
37 | 37 |
38 namespace blink { | 38 namespace blink { |
39 | 39 |
40 // A basic biquad (two-zero / two-pole digital filter) | 40 // A basic biquad (two-zero / two-pole digital filter) |
41 // | 41 // |
42 // It can be configured to a number of common and very useful filters: | 42 // It can be configured to a number of common and very useful filters: |
43 // lowpass, highpass, shelving, parameteric, notch, allpass, ... | 43 // lowpass, highpass, shelving, parameteric, notch, allpass, ... |
44 | 44 |
45 class PLATFORM_EXPORT Biquad final { | 45 class PLATFORM_EXPORT Biquad final { |
46 DISALLOW_NEW(); | 46 DISALLOW_NEW(); |
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114 // Filter memory | 114 // Filter memory |
115 double m_x1; // input delayed by 1 sample | 115 double m_x1; // input delayed by 1 sample |
116 double m_x2; // input delayed by 2 samples | 116 double m_x2; // input delayed by 2 samples |
117 double m_y1; // output delayed by 1 sample | 117 double m_y1; // output delayed by 1 sample |
118 double m_y2; // output delayed by 2 samples | 118 double m_y2; // output delayed by 2 samples |
119 }; | 119 }; |
120 | 120 |
121 } // namespace blink | 121 } // namespace blink |
122 | 122 |
123 #endif // Biquad_h | 123 #endif // Biquad_h |
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