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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 AN Y |
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED | 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
15 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | 15 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
16 * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR AN Y | 16 * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR AN Y |
17 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | 17 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
18 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | 18 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
19 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND O N | 19 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND O N |
20 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | 20 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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/AudioUtilities.h" | 29 #include "platform/audio/AudioUtilities.h" |
30 | |
30 #include "wtf/Assertions.h" | 31 #include "wtf/Assertions.h" |
31 #include "wtf/MathExtras.h" | 32 #include "wtf/MathExtras.h" |
32 | 33 |
33 namespace blink { | 34 namespace blink { |
34 | 35 |
35 namespace AudioUtilities { | 36 namespace AudioUtilities { |
36 | 37 |
37 float decibelsToLinear(float decibels) | 38 float decibelsToLinear(float decibels) |
38 { | 39 { |
39 return powf(10, 0.05f * decibels); | 40 return powf(10, 0.05f * decibels); |
(...skipping 12 matching lines...) Expand all Loading... | |
52 | 53 |
53 double discreteTimeConstantForSampleRate(double timeConstant, double sampleRate) | 54 double discreteTimeConstantForSampleRate(double timeConstant, double sampleRate) |
54 { | 55 { |
55 return 1 - exp(-1 / (sampleRate * timeConstant)); | 56 return 1 - exp(-1 / (sampleRate * timeConstant)); |
56 } | 57 } |
57 | 58 |
58 size_t timeToSampleFrame(double time, double sampleRate) | 59 size_t timeToSampleFrame(double time, double sampleRate) |
59 { | 60 { |
60 return static_cast<size_t>(round(time * sampleRate)); | 61 return static_cast<size_t>(round(time * sampleRate)); |
61 } | 62 } |
63 | |
64 bool isValidAudioBufferSampleRate(float sampleRate) | |
65 { | |
66 return sampleRate >= minAudioBufferSampleRate() && sampleRate <= maxAudioBuf ferSampleRate(); | |
67 } | |
68 | |
69 float minAudioBufferSampleRate() | |
70 { | |
71 // crbug.com/344375 | |
72 return 3000; | |
73 } | |
74 | |
75 float maxAudioBufferSampleRate() | |
76 { | |
77 // Windows can support up to this rate. | |
Raymond Toy
2014/09/12 15:56:55
Nit: Not your fault, bu can you update this commen
KhNo
2014/09/12 16:17:11
Done.
| |
78 return 192000; | |
79 } | |
62 } // AudioUtilites | 80 } // AudioUtilites |
63 | 81 |
64 } // namespace blink | 82 } // namespace blink |
65 | 83 |
66 #endif // ENABLE(WEB_AUDIO) | 84 #endif // ENABLE(WEB_AUDIO) |
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