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Side by Side Diff: third_party/WebKit/Source/platform/audio/MultiChannelResampler.cpp

Issue 2615813003: Migrate WTF::Vector::append() to ::push_back() [part 14 of N] (Closed)
Patch Set: rebase, small fix in FontSettings.h Created 3 years, 11 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 * 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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93 }; 93 };
94 94
95 } // namespace 95 } // namespace
96 96
97 MultiChannelResampler::MultiChannelResampler(double scaleFactor, 97 MultiChannelResampler::MultiChannelResampler(double scaleFactor,
98 unsigned numberOfChannels) 98 unsigned numberOfChannels)
99 : m_numberOfChannels(numberOfChannels) { 99 : m_numberOfChannels(numberOfChannels) {
100 // Create each channel's resampler. 100 // Create each channel's resampler.
101 for (unsigned channelIndex = 0; channelIndex < numberOfChannels; 101 for (unsigned channelIndex = 0; channelIndex < numberOfChannels;
102 ++channelIndex) 102 ++channelIndex)
103 m_kernels.append(WTF::makeUnique<SincResampler>(scaleFactor)); 103 m_kernels.push_back(WTF::makeUnique<SincResampler>(scaleFactor));
104 } 104 }
105 105
106 void MultiChannelResampler::process(AudioSourceProvider* provider, 106 void MultiChannelResampler::process(AudioSourceProvider* provider,
107 AudioBus* destination, 107 AudioBus* destination,
108 size_t framesToProcess) { 108 size_t framesToProcess) {
109 // The provider can provide us with multi-channel audio data. But each of our 109 // The provider can provide us with multi-channel audio data. But each of our
110 // single-channel resamplers (kernels) below requires a provider which 110 // single-channel resamplers (kernels) below requires a provider which
111 // provides a single unique channel of data. channelProvider wraps the 111 // provides a single unique channel of data. channelProvider wraps the
112 // original multi-channel provider and dishes out one channel at a time. 112 // original multi-channel provider and dishes out one channel at a time.
113 ChannelProvider channelProvider(provider, m_numberOfChannels); 113 ChannelProvider channelProvider(provider, m_numberOfChannels);
114 114
115 for (unsigned channelIndex = 0; channelIndex < m_numberOfChannels; 115 for (unsigned channelIndex = 0; channelIndex < m_numberOfChannels;
116 ++channelIndex) { 116 ++channelIndex) {
117 // Depending on the sample-rate scale factor, and the internal buffering 117 // Depending on the sample-rate scale factor, and the internal buffering
118 // used in a SincResampler kernel, this call to process() will only 118 // used in a SincResampler kernel, this call to process() will only
119 // sometimes call provideInput() on the channelProvider. However, if it 119 // sometimes call provideInput() on the channelProvider. However, if it
120 // calls provideInput() for the first channel, then it will call it for the 120 // calls provideInput() for the first channel, then it will call it for the
121 // remaining channels, since they all buffer in the same way and are 121 // remaining channels, since they all buffer in the same way and are
122 // processing the same number of frames. 122 // processing the same number of frames.
123 m_kernels[channelIndex]->process( 123 m_kernels[channelIndex]->process(
124 &channelProvider, destination->channel(channelIndex)->mutableData(), 124 &channelProvider, destination->channel(channelIndex)->mutableData(),
125 framesToProcess); 125 framesToProcess);
126 } 126 }
127 } 127 }
128 128
129 } // namespace blink 129 } // namespace blink
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