1 | /* |
2 | Copyright 2018 Google Inc. All Rights Reserved. |
3 | |
4 | Licensed under the Apache License, Version 2.0 (the "License"); |
5 | you may not use this file except in compliance with the License. |
6 | You may obtain a copy of the License at |
7 | |
8 | http://www.apache.org/licenses/LICENSE-2.0 |
9 | |
10 | Unless required by applicable law or agreed to in writing, software |
11 | distributed under the License is distributed on an "AS-IS" BASIS, |
12 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
13 | See the License for the specific language governing permissions and |
14 | limitations under the License. |
15 | */ |
16 | |
17 | #ifndef RESONANCE_AUDIO_UTILS_SUM_AND_DIFFERENCE_PROCESSOR_H_ |
18 | #define RESONANCE_AUDIO_UTILS_SUM_AND_DIFFERENCE_PROCESSOR_H_ |
19 | |
20 | #include "base/audio_buffer.h" |
21 | |
22 | namespace vraudio { |
23 | |
24 | // Class which converts a 2-channel input audio buffer into its sum and |
25 | // difference signals and stores them in the left and right channel |
26 | // respectively. |
27 | class SumAndDifferenceProcessor { |
28 | public: |
29 | // Constructs a stereo sum and difference processor. |
30 | // |
31 | // @param num_frames Number of frames in the stereo input audio buffer. |
32 | explicit SumAndDifferenceProcessor(size_t num_frames); |
33 | |
34 | // Converts a 2-channel buffer signals into their sum and difference. |
35 | void Process(AudioBuffer* stereo_buffer); |
36 | |
37 | private: |
38 | // Temporary audio buffer to store left channel input data during conversion. |
39 | AudioBuffer temp_buffer_; |
40 | }; |
41 | |
42 | } // namespace vraudio |
43 | |
44 | #endif // RESONANCE_AUDIO_UTILS_SUM_AND_DIFFERENCE_PROCESSOR_H_ |
45 | |