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Side by Side Diff: Source/modules/webaudio/WaveShaperDSPKernel.h

Issue 15619003: Add support for WaveShaperNode.oversample (Closed) Base URL: svn://svn.chromium.org/blink/trunk
Patch Set: change TestExpectations in middle of file Created 7 years, 6 months ago
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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 * 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
11 * documentation and/or other materials provided with the distribution. 11 * documentation and/or other materials provided with the distribution.
12 * 12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND AN Y 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND AN Y
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
15 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 15 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
16 * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR AN Y 16 * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR AN Y
17 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 17 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
18 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 18 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
19 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND O N 19 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND O N
20 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 20 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
22 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 22 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23 */ 23 */
24 24
25 #ifndef WaveShaperDSPKernel_h 25 #ifndef WaveShaperDSPKernel_h
26 #define WaveShaperDSPKernel_h 26 #define WaveShaperDSPKernel_h
27 27
28 #include "core/platform/audio/AudioArray.h"
28 #include "core/platform/audio/AudioDSPKernel.h" 29 #include "core/platform/audio/AudioDSPKernel.h"
30 #include "core/platform/audio/DownSampler.h"
31 #include "core/platform/audio/UpSampler.h"
29 #include "modules/webaudio/WaveShaperProcessor.h" 32 #include "modules/webaudio/WaveShaperProcessor.h"
33 #include "wtf/OwnPtr.h"
30 34
31 namespace WebCore { 35 namespace WebCore {
32 36
33 class WaveShaperProcessor; 37 class WaveShaperProcessor;
34 38
35 // WaveShaperDSPKernel is an AudioDSPKernel and is responsible for non-linear di stortion on one channel. 39 // WaveShaperDSPKernel is an AudioDSPKernel and is responsible for non-linear di stortion on one channel.
36 40
37 class WaveShaperDSPKernel : public AudioDSPKernel { 41 class WaveShaperDSPKernel : public AudioDSPKernel {
38 public: 42 public:
39 explicit WaveShaperDSPKernel(WaveShaperProcessor* processor) 43 explicit WaveShaperDSPKernel(WaveShaperProcessor*);
40 : AudioDSPKernel(processor) 44
41 {
42 }
43
44 // AudioDSPKernel 45 // AudioDSPKernel
45 virtual void process(const float* source, float* dest, size_t framesToProces s); 46 virtual void process(const float* source, float* dest, size_t framesToProces s);
46 virtual void reset() { } 47 virtual void reset();
47 virtual double tailTime() const OVERRIDE { return 0; } 48 virtual double tailTime() const OVERRIDE { return 0; }
48 virtual double latencyTime() const OVERRIDE { return 0; } 49 virtual double latencyTime() const OVERRIDE;
49 50
51 // Oversampling requires more resources, so let's only allocate them if need ed.
52 void lazyInitializeOversampling();
53
50 protected: 54 protected:
55 // Apply the shaping curve.
56 void processCurve(const float* source, float* dest, size_t framesToProcess);
57
58 // Use up-sampling, process at the higher sample-rate, then down-sample.
59 void processCurve2x(const float* source, float* dest, size_t framesToProcess );
60 void processCurve4x(const float* source, float* dest, size_t framesToProcess );
61
51 WaveShaperProcessor* waveShaperProcessor() { return static_cast<WaveShaperPr ocessor*>(processor()); } 62 WaveShaperProcessor* waveShaperProcessor() { return static_cast<WaveShaperPr ocessor*>(processor()); }
63
64 // Oversampling.
65 OwnPtr<AudioFloatArray> m_tempBuffer;
66 OwnPtr<AudioFloatArray> m_tempBuffer2;
67 OwnPtr<UpSampler> m_upSampler;
68 OwnPtr<DownSampler> m_downSampler;
69 OwnPtr<UpSampler> m_upSampler2;
70 OwnPtr<DownSampler> m_downSampler2;
52 }; 71 };
53 72
54 } // namespace WebCore 73 } // namespace WebCore
55 74
56 #endif // WaveShaperDSPKernel_h 75 #endif // WaveShaperDSPKernel_h
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