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#ifndef ReverbInputBuffer_h
30#define ReverbInputBuffer_h
31
32#include "AudioArray.h"
33
34namespace WebCore {
35
36// ReverbInputBuffer is used to buffer input samples for deferred processing by the background threads.
37class ReverbInputBuffer {
38public:
39 ReverbInputBuffer(size_t length);
40
41 // The realtime audio thread keeps writing samples here.
42 // The assumption is that the buffer's length is evenly divisible by numberOfFrames (for nearly all cases this will be fine).
43 // FIXME: remove numberOfFrames restriction...
44 void write(const float* sourceP, size_t numberOfFrames);
45
46 // Background threads can call this to check if there's anything to read...
47 size_t writeIndex() const { return m_writeIndex; }
48
49 // The individual background threads read here (and hope that they can keep up with the buffer writing).
50 // readIndex is updated with the next readIndex to read from...
51 // The assumption is that the buffer's length is evenly divisible by numberOfFrames.
52 // FIXME: remove numberOfFrames restriction...
53 float* directReadFrom(int* readIndex, size_t numberOfFrames);
54
55 void reset();
56
57private:
58 AudioFloatArray m_buffer;
59 size_t m_writeIndex;
60};
61
62} // namespace WebCore
63
64#endif // ReverbInputBuffer_h
65