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 Computer, 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 "third_party/blink/renderer/platform/audio/reverb_input_buffer.h"
30
31 namespace blink {
32
ReverbInputBuffer(size_t length)33 ReverbInputBuffer::ReverbInputBuffer(size_t length)
34 : buffer_(length), write_index_(0) {}
35
Write(const float * source_p,size_t number_of_frames)36 void ReverbInputBuffer::Write(const float* source_p, size_t number_of_frames) {
37 size_t buffer_length = buffer_.size();
38 size_t index = WriteIndex();
39 size_t new_index = index + number_of_frames;
40
41 CHECK_LE(new_index, buffer_length);
42
43 memcpy(buffer_.Data() + index, source_p, sizeof(float) * number_of_frames);
44
45 if (new_index >= buffer_length)
46 new_index = 0;
47
48 SetWriteIndex(new_index);
49 }
50
DirectReadFrom(int * read_index,size_t number_of_frames)51 float* ReverbInputBuffer::DirectReadFrom(int* read_index,
52 size_t number_of_frames) {
53 size_t buffer_length = buffer_.size();
54 DCHECK(read_index);
55 DCHECK_GE(*read_index, 0);
56 DCHECK_LE(*read_index + number_of_frames, buffer_length);
57
58 float* source_p = buffer_.Data();
59 float* p = source_p + *read_index;
60
61 // Update readIndex
62 *read_index = (*read_index + number_of_frames) % buffer_length;
63
64 return p;
65 }
66
Reset()67 void ReverbInputBuffer::Reset() {
68 buffer_.Zero();
69 write_index_ = 0;
70 }
71
72 } // namespace blink
73