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1 // Copyright 2014 The Chromium Authors. All rights reserved. | 1 // Copyright 2014 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "platform/audio/StereoPanner.h" | 5 #include "platform/audio/StereoPanner.h" |
6 #include <algorithm> | 6 #include <algorithm> |
7 #include "platform/audio/AudioBus.h" | 7 #include "platform/audio/AudioBus.h" |
8 #include "platform/audio/AudioUtilities.h" | 8 #include "platform/audio/AudioUtilities.h" |
9 #include "wtf/MathExtras.h" | 9 #include "wtf/MathExtras.h" |
10 | 10 |
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24 : m_isFirstRender(true), m_pan(0.0) { | 24 : m_isFirstRender(true), m_pan(0.0) { |
25 // Convert smoothing time (50ms) to a per-sample time value. | 25 // Convert smoothing time (50ms) to a per-sample time value. |
26 m_smoothingConstant = AudioUtilities::discreteTimeConstantForSampleRate( | 26 m_smoothingConstant = AudioUtilities::discreteTimeConstantForSampleRate( |
27 SmoothingTimeConstant, sampleRate); | 27 SmoothingTimeConstant, sampleRate); |
28 } | 28 } |
29 | 29 |
30 void StereoPanner::panWithSampleAccurateValues(const AudioBus* inputBus, | 30 void StereoPanner::panWithSampleAccurateValues(const AudioBus* inputBus, |
31 AudioBus* outputBus, | 31 AudioBus* outputBus, |
32 const float* panValues, | 32 const float* panValues, |
33 size_t framesToProcess) { | 33 size_t framesToProcess) { |
34 bool isInputSafe = inputBus && (inputBus->numberOfChannels() == 1 || | 34 bool isInputSafe = inputBus && |
35 inputBus->numberOfChannels() == 2) && | 35 (inputBus->numberOfChannels() == 1 || |
| 36 inputBus->numberOfChannels() == 2) && |
36 framesToProcess <= inputBus->length(); | 37 framesToProcess <= inputBus->length(); |
37 ASSERT(isInputSafe); | 38 ASSERT(isInputSafe); |
38 if (!isInputSafe) | 39 if (!isInputSafe) |
39 return; | 40 return; |
40 | 41 |
41 unsigned numberOfInputChannels = inputBus->numberOfChannels(); | 42 unsigned numberOfInputChannels = inputBus->numberOfChannels(); |
42 | 43 |
43 bool isOutputSafe = outputBus && outputBus->numberOfChannels() == 2 && | 44 bool isOutputSafe = outputBus && outputBus->numberOfChannels() == 2 && |
44 framesToProcess <= outputBus->length(); | 45 framesToProcess <= outputBus->length(); |
45 ASSERT(isOutputSafe); | 46 ASSERT(isOutputSafe); |
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89 *destinationR++ = static_cast<float>(inputR + inputL * gainR); | 90 *destinationR++ = static_cast<float>(inputR + inputL * gainR); |
90 } | 91 } |
91 } | 92 } |
92 } | 93 } |
93 } | 94 } |
94 | 95 |
95 void StereoPanner::panToTargetValue(const AudioBus* inputBus, | 96 void StereoPanner::panToTargetValue(const AudioBus* inputBus, |
96 AudioBus* outputBus, | 97 AudioBus* outputBus, |
97 float panValue, | 98 float panValue, |
98 size_t framesToProcess) { | 99 size_t framesToProcess) { |
99 bool isInputSafe = inputBus && (inputBus->numberOfChannels() == 1 || | 100 bool isInputSafe = inputBus && |
100 inputBus->numberOfChannels() == 2) && | 101 (inputBus->numberOfChannels() == 1 || |
| 102 inputBus->numberOfChannels() == 2) && |
101 framesToProcess <= inputBus->length(); | 103 framesToProcess <= inputBus->length(); |
102 ASSERT(isInputSafe); | 104 ASSERT(isInputSafe); |
103 if (!isInputSafe) | 105 if (!isInputSafe) |
104 return; | 106 return; |
105 | 107 |
106 unsigned numberOfInputChannels = inputBus->numberOfChannels(); | 108 unsigned numberOfInputChannels = inputBus->numberOfChannels(); |
107 | 109 |
108 bool isOutputSafe = outputBus && outputBus->numberOfChannels() == 2 && | 110 bool isOutputSafe = outputBus && outputBus->numberOfChannels() == 2 && |
109 framesToProcess <= outputBus->length(); | 111 framesToProcess <= outputBus->length(); |
110 ASSERT(isOutputSafe); | 112 ASSERT(isOutputSafe); |
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172 // When [0; 1], keep right channel intact and equal-power pan the | 174 // When [0; 1], keep right channel intact and equal-power pan the |
173 // left channel only. | 175 // left channel only. |
174 *destinationL++ = static_cast<float>(inputL * gainL); | 176 *destinationL++ = static_cast<float>(inputL * gainL); |
175 *destinationR++ = static_cast<float>(inputR + inputL * gainR); | 177 *destinationR++ = static_cast<float>(inputR + inputL * gainR); |
176 } | 178 } |
177 } | 179 } |
178 } | 180 } |
179 } | 181 } |
180 | 182 |
181 } // namespace blink | 183 } // namespace blink |
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