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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 |
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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 #include "config.h" | 25 #include "config.h" |
26 | 26 |
27 #if ENABLE(WEB_AUDIO) | 27 #if ENABLE(WEB_AUDIO) |
28 | 28 |
29 #include "platform/audio/AudioResamplerKernel.h" | 29 #include "platform/audio/AudioResamplerKernel.h" |
30 | 30 |
31 #include <algorithm> | |
32 #include "platform/audio/AudioResampler.h" | 31 #include "platform/audio/AudioResampler.h" |
| 32 #include "wtf/MathExtras.h" |
33 | 33 |
34 namespace blink { | 34 namespace blink { |
35 | 35 |
36 const size_t AudioResamplerKernel::MaxFramesToProcess = 128; | 36 const size_t AudioResamplerKernel::MaxFramesToProcess = 128; |
37 | 37 |
38 AudioResamplerKernel::AudioResamplerKernel(AudioResampler* resampler) | 38 AudioResamplerKernel::AudioResamplerKernel(AudioResampler* resampler) |
39 : m_resampler(resampler) | 39 : m_resampler(resampler) |
40 // The buffer size must be large enough to hold up to two extra sample frame
s for the linear interpolation. | 40 // The buffer size must be large enough to hold up to two extra sample frame
s for the linear interpolation. |
41 , m_sourceBuffer(2 + static_cast<int>(MaxFramesToProcess * AudioResampler::M
axRate)) | 41 , m_sourceBuffer(2 + static_cast<int>(MaxFramesToProcess * AudioResampler::M
axRate)) |
42 , m_virtualReadIndex(0.0) | 42 , m_virtualReadIndex(0.0) |
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71 return m_sourceBuffer.data() + m_fillIndex; | 71 return m_sourceBuffer.data() + m_fillIndex; |
72 } | 72 } |
73 | 73 |
74 void AudioResamplerKernel::process(float* destination, size_t framesToProcess) | 74 void AudioResamplerKernel::process(float* destination, size_t framesToProcess) |
75 { | 75 { |
76 ASSERT(framesToProcess <= MaxFramesToProcess); | 76 ASSERT(framesToProcess <= MaxFramesToProcess); |
77 | 77 |
78 float* source = m_sourceBuffer.data(); | 78 float* source = m_sourceBuffer.data(); |
79 | 79 |
80 double rate = this->rate(); | 80 double rate = this->rate(); |
81 rate = std::max(0.0, rate); | 81 rate = clampTo(rate, 0.0, AudioResampler::MaxRate); |
82 rate = std::min(AudioResampler::MaxRate, rate); | |
83 | 82 |
84 // Start out with the previous saved values (if any). | 83 // Start out with the previous saved values (if any). |
85 if (m_fillIndex > 0) { | 84 if (m_fillIndex > 0) { |
86 source[0] = m_lastValues[0]; | 85 source[0] = m_lastValues[0]; |
87 source[1] = m_lastValues[1]; | 86 source[1] = m_lastValues[1]; |
88 } | 87 } |
89 | 88 |
90 // Make a local copy. | 89 // Make a local copy. |
91 double virtualReadIndex = m_virtualReadIndex; | 90 double virtualReadIndex = m_virtualReadIndex; |
92 | 91 |
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132 } | 131 } |
133 | 132 |
134 double AudioResamplerKernel::rate() const | 133 double AudioResamplerKernel::rate() const |
135 { | 134 { |
136 return m_resampler->rate(); | 135 return m_resampler->rate(); |
137 } | 136 } |
138 | 137 |
139 } // namespace blink | 138 } // namespace blink |
140 | 139 |
141 #endif // ENABLE(WEB_AUDIO) | 140 #endif // ENABLE(WEB_AUDIO) |
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