1/*
2 * Copyright (C) 2010 Google Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of Apple Inc. ("Apple") nor the names of
14 * its contributors may be used to endorse or promote products derived
15 * from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#include "config.h"
30
31#if ENABLE(WEB_AUDIO)
32
33#include "AudioChannel.h"
34
35#include "VectorMath.h"
36#include <algorithm>
37#include <math.h>
38
39namespace WebCore {
40
41using namespace VectorMath;
42
43void AudioChannel::resizeSmaller(size_t newLength)
44{
45 ASSERT(newLength <= m_length);
46 if (newLength <= m_length)
47 m_length = newLength;
48}
49
50void AudioChannel::scale(float scale)
51{
52 if (isSilent())
53 return;
54
55 vsmul(data(), 1, &scale, mutableData(), 1, length());
56}
57
58void AudioChannel::copyFrom(const AudioChannel* sourceChannel)
59{
60 bool isSafe = (sourceChannel && sourceChannel->length() >= length());
61 ASSERT(isSafe);
62
63 if (!isSafe || sourceChannel->isSilent()) {
64 zero();
65 return;
66 }
67 memcpy(mutableData(), sourceChannel->data(), sizeof(float) * length());
68}
69
70void AudioChannel::copyFromRange(const AudioChannel* sourceChannel, unsigned startFrame, unsigned endFrame)
71{
72 // Check that range is safe for reading from sourceChannel.
73 bool isRangeSafe = sourceChannel && startFrame < endFrame && endFrame <= sourceChannel->length();
74 ASSERT(isRangeSafe);
75 if (!isRangeSafe)
76 return;
77
78 if (sourceChannel->isSilent() && isSilent())
79 return;
80
81 // Check that this channel has enough space.
82 size_t rangeLength = endFrame - startFrame;
83 bool isRangeLengthSafe = rangeLength <= length();
84 ASSERT(isRangeLengthSafe);
85 if (!isRangeLengthSafe)
86 return;
87
88 const float* source = sourceChannel->data();
89 float* destination = mutableData();
90
91 if (sourceChannel->isSilent()) {
92 if (rangeLength == length())
93 zero();
94 else
95 memset(destination, 0, sizeof(float) * rangeLength);
96 } else
97 memcpy(destination, source + startFrame, sizeof(float) * rangeLength);
98}
99
100void AudioChannel::sumFrom(const AudioChannel* sourceChannel)
101{
102 bool isSafe = sourceChannel && sourceChannel->length() >= length();
103 ASSERT(isSafe);
104 if (!isSafe)
105 return;
106
107 if (sourceChannel->isSilent())
108 return;
109
110 if (isSilent())
111 copyFrom(sourceChannel);
112 else
113 vadd(data(), 1, sourceChannel->data(), 1, mutableData(), 1, length());
114}
115
116float AudioChannel::maxAbsValue() const
117{
118 if (isSilent())
119 return 0;
120
121 float max = 0;
122
123 vmaxmgv(data(), 1, &max, length());
124
125 return max;
126}
127
128} // WebCore
129
130#endif // ENABLE(WEB_AUDIO)
131