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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 |
| (...skipping 15 matching lines...) Expand all Loading... |
| 26 #include "platform/audio/AudioResampler.h" | 26 #include "platform/audio/AudioResampler.h" |
| 27 #include "wtf/MathExtras.h" | 27 #include "wtf/MathExtras.h" |
| 28 #include "wtf/PtrUtil.h" | 28 #include "wtf/PtrUtil.h" |
| 29 #include <algorithm> | 29 #include <algorithm> |
| 30 | 30 |
| 31 namespace blink { | 31 namespace blink { |
| 32 | 32 |
| 33 const double AudioResampler::MaxRate = 8.0; | 33 const double AudioResampler::MaxRate = 8.0; |
| 34 | 34 |
| 35 AudioResampler::AudioResampler() : m_rate(1.0) { | 35 AudioResampler::AudioResampler() : m_rate(1.0) { |
| 36 m_kernels.append(WTF::makeUnique<AudioResamplerKernel>(this)); | 36 m_kernels.push_back(WTF::makeUnique<AudioResamplerKernel>(this)); |
| 37 m_sourceBus = AudioBus::create(1, 0, false); | 37 m_sourceBus = AudioBus::create(1, 0, false); |
| 38 } | 38 } |
| 39 | 39 |
| 40 AudioResampler::AudioResampler(unsigned numberOfChannels) : m_rate(1.0) { | 40 AudioResampler::AudioResampler(unsigned numberOfChannels) : m_rate(1.0) { |
| 41 for (unsigned i = 0; i < numberOfChannels; ++i) | 41 for (unsigned i = 0; i < numberOfChannels; ++i) |
| 42 m_kernels.append(WTF::makeUnique<AudioResamplerKernel>(this)); | 42 m_kernels.push_back(WTF::makeUnique<AudioResamplerKernel>(this)); |
| 43 | 43 |
| 44 m_sourceBus = AudioBus::create(numberOfChannels, 0, false); | 44 m_sourceBus = AudioBus::create(numberOfChannels, 0, false); |
| 45 } | 45 } |
| 46 | 46 |
| 47 void AudioResampler::configureChannels(unsigned numberOfChannels) { | 47 void AudioResampler::configureChannels(unsigned numberOfChannels) { |
| 48 unsigned currentSize = m_kernels.size(); | 48 unsigned currentSize = m_kernels.size(); |
| 49 if (numberOfChannels == currentSize) | 49 if (numberOfChannels == currentSize) |
| 50 return; // already setup | 50 return; // already setup |
| 51 | 51 |
| 52 // First deal with adding or removing kernels. | 52 // First deal with adding or removing kernels. |
| 53 if (numberOfChannels > currentSize) { | 53 if (numberOfChannels > currentSize) { |
| 54 for (unsigned i = currentSize; i < numberOfChannels; ++i) | 54 for (unsigned i = currentSize; i < numberOfChannels; ++i) |
| 55 m_kernels.append(WTF::makeUnique<AudioResamplerKernel>(this)); | 55 m_kernels.push_back(WTF::makeUnique<AudioResamplerKernel>(this)); |
| 56 } else | 56 } else |
| 57 m_kernels.resize(numberOfChannels); | 57 m_kernels.resize(numberOfChannels); |
| 58 | 58 |
| 59 // Reconfigure our source bus to the new channel size. | 59 // Reconfigure our source bus to the new channel size. |
| 60 m_sourceBus = AudioBus::create(numberOfChannels, 0, false); | 60 m_sourceBus = AudioBus::create(numberOfChannels, 0, false); |
| 61 } | 61 } |
| 62 | 62 |
| 63 void AudioResampler::process(AudioSourceProvider* provider, | 63 void AudioResampler::process(AudioSourceProvider* provider, |
| 64 AudioBus* destinationBus, | 64 AudioBus* destinationBus, |
| 65 size_t framesToProcess) { | 65 size_t framesToProcess) { |
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| 110 m_rate = std::min(AudioResampler::MaxRate, rate); | 110 m_rate = std::min(AudioResampler::MaxRate, rate); |
| 111 } | 111 } |
| 112 | 112 |
| 113 void AudioResampler::reset() { | 113 void AudioResampler::reset() { |
| 114 unsigned numberOfChannels = m_kernels.size(); | 114 unsigned numberOfChannels = m_kernels.size(); |
| 115 for (unsigned i = 0; i < numberOfChannels; ++i) | 115 for (unsigned i = 0; i < numberOfChannels; ++i) |
| 116 m_kernels[i]->reset(); | 116 m_kernels[i]->reset(); |
| 117 } | 117 } |
| 118 | 118 |
| 119 } // namespace blink | 119 } // namespace blink |
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