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Side by Side Diff: third_party/WebKit/Source/platform/audio/AudioResamplerKernel.h

Issue 2384073002: reflow comments in platform/audio (Closed)
Patch Set: Created 4 years, 2 months ago
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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
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
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR AN Y 16 * ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE
17 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
19 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND O N 19 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
20 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 20 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
23 * DAMAGE.
23 */ 24 */
24 25
25 #ifndef AudioResamplerKernel_h 26 #ifndef AudioResamplerKernel_h
26 #define AudioResamplerKernel_h 27 #define AudioResamplerKernel_h
27 28
28 #include "platform/PlatformExport.h" 29 #include "platform/PlatformExport.h"
29 #include "platform/audio/AudioArray.h" 30 #include "platform/audio/AudioArray.h"
30 #include "wtf/Allocator.h" 31 #include "wtf/Allocator.h"
31 32
32 namespace blink { 33 namespace blink {
33 34
34 class AudioResampler; 35 class AudioResampler;
35 36
36 // AudioResamplerKernel does resampling on a single mono channel. 37 // AudioResamplerKernel does resampling on a single mono channel.
37 // It uses a simple linear interpolation for good performance. 38 // It uses a simple linear interpolation for good performance.
38 39
39 class PLATFORM_EXPORT AudioResamplerKernel { 40 class PLATFORM_EXPORT AudioResamplerKernel {
40 USING_FAST_MALLOC(AudioResamplerKernel); 41 USING_FAST_MALLOC(AudioResamplerKernel);
41 WTF_MAKE_NONCOPYABLE(AudioResamplerKernel); 42 WTF_MAKE_NONCOPYABLE(AudioResamplerKernel);
42 43
43 public: 44 public:
44 AudioResamplerKernel(AudioResampler*); 45 AudioResamplerKernel(AudioResampler*);
45 46
46 // getSourcePointer() should be called each time before process() is called. 47 // getSourcePointer() should be called each time before process() is called.
47 // Given a number of frames to process (for subsequent call to process()), it returns a pointer and numberOfSourceFramesNeeded 48 // Given a number of frames to process (for subsequent call to process()), it
48 // where sample data should be copied. This sample data provides the input to the resampler when process() is called. 49 // returns a pointer and numberOfSourceFramesNeeded where sample data should
49 // framesToProcess must be less than or equal to MaxFramesToProcess. 50 // be copied. This sample data provides the input to the resampler when
51 // process() is called. framesToProcess must be less than or equal to
52 // MaxFramesToProcess.
50 float* getSourcePointer(size_t framesToProcess, 53 float* getSourcePointer(size_t framesToProcess,
51 size_t* numberOfSourceFramesNeeded); 54 size_t* numberOfSourceFramesNeeded);
52 55
53 // process() resamples framesToProcess frames from the source into destination . 56 // process() resamples framesToProcess frames from the source into
54 // Each call to process() must be preceded by a call to getSourcePointer() so that source input may be supplied. 57 // destination. Each call to process() must be preceded by a call to
55 // framesToProcess must be less than or equal to MaxFramesToProcess. 58 // getSourcePointer() so that source input may be supplied. framesToProcess
59 // must be less than or equal to MaxFramesToProcess.
56 void process(float* destination, size_t framesToProcess); 60 void process(float* destination, size_t framesToProcess);
57 61
58 // Resets the processing state. 62 // Resets the processing state.
59 void reset(); 63 void reset();
60 64
61 static const size_t MaxFramesToProcess; 65 static const size_t MaxFramesToProcess;
62 66
63 private: 67 private:
64 double rate() const; 68 double rate() const;
65 69
66 AudioResampler* m_resampler; 70 AudioResampler* m_resampler;
67 AudioFloatArray m_sourceBuffer; 71 AudioFloatArray m_sourceBuffer;
68 72
69 // This is a (floating point) read index on the input stream. 73 // This is a (floating point) read index on the input stream.
70 double m_virtualReadIndex; 74 double m_virtualReadIndex;
71 75
72 // We need to have continuity from one call of process() to the next. 76 // We need to have continuity from one call of process() to the next.
73 // m_lastValues stores the last two sample values from the last call to proces s(). 77 // m_lastValues stores the last two sample values from the last call to
74 // m_fillIndex represents how many buffered samples we have which can be as ma ny as 2. 78 // process(). m_fillIndex represents how many buffered samples we have which
75 // For the first call to process() (or after reset()) there will be no buffere d samples. 79 // can be as many as 2. For the first call to process() (or after reset())
80 // there will be no buffered samples.
76 float m_lastValues[2]; 81 float m_lastValues[2];
77 unsigned m_fillIndex; 82 unsigned m_fillIndex;
78 }; 83 };
79 84
80 } // namespace blink 85 } // namespace blink
81 86
82 #endif // AudioResamplerKernel_h 87 #endif // AudioResamplerKernel_h
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