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1 /* | |
2 * Copyright (c) 2016 The WebRTC project authors. All Rights Reserved. | |
3 * | |
4 * Use of this source code is governed by a BSD-style license | |
5 * that can be found in the LICENSE file in the root of the source | |
6 * tree. An additional intellectual property rights grant can be found | |
7 * in the file PATENTS. All contributing project authors may | |
8 * be found in the AUTHORS file in the root of the source tree. | |
9 */ | |
10 | |
11 #ifndef WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_AEC3_CONSTANTS_H_ | |
12 #define WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_AEC3_CONSTANTS_H_ | |
13 | |
14 #include <stddef.h> | |
15 | |
16 namespace webrtc { | |
17 | |
18 constexpr size_t kFftLengthBy2 = 64; | |
19 constexpr size_t kFftLengthBy2Plus1 = kFftLengthBy2 + 1; | |
20 constexpr size_t kFftLength = 2 * kFftLengthBy2; | |
21 | |
22 constexpr size_t kMaxNumBands = 3; | |
23 constexpr size_t kSubFrameLength = 80; | |
24 | |
25 constexpr size_t kBlockSize = kFftLengthBy2; | |
26 constexpr size_t kExtendedBlockSize = 2 * kFftLengthBy2; | |
27 constexpr size_t kSubBlockSize = 16; | |
28 | |
29 constexpr size_t NumBandsForRate(int sample_rate_hz) { | |
30 return static_cast<size_t>(sample_rate_hz == 8000 ? 1 | |
31 : sample_rate_hz / 16000); | |
32 } | |
33 constexpr int LowestBandRate(int sample_rate_hz) { | |
34 return sample_rate_hz == 8000 ? sample_rate_hz : 16000; | |
35 } | |
36 | |
37 constexpr bool ValidFullBandRate(int sample_rate_hz) { | |
38 return sample_rate_hz == 8000 || sample_rate_hz == 16000 || | |
39 sample_rate_hz == 32000 || sample_rate_hz == 48000; | |
40 } | |
41 | |
42 static_assert(1 == NumBandsForRate(8000), "Number of bands for 8 kHz"); | |
43 static_assert(1 == NumBandsForRate(16000), "Number of bands for 16 kHz"); | |
44 static_assert(2 == NumBandsForRate(32000), "Number of bands for 32 kHz"); | |
45 static_assert(3 == NumBandsForRate(48000), "Number of bands for 48 kHz"); | |
46 | |
47 static_assert(8000 == LowestBandRate(8000), "Sample rate of band 0 for 8 kHz"); | |
48 static_assert(16000 == LowestBandRate(16000), | |
49 "Sample rate of band 0 for 16 kHz"); | |
50 static_assert(16000 == LowestBandRate(32000), | |
51 "Sample rate of band 0 for 32 kHz"); | |
52 static_assert(16000 == LowestBandRate(48000), | |
53 "Sample rate of band 0 for 48 kHz"); | |
54 | |
55 static_assert(ValidFullBandRate(8000), | |
56 "Test that 8 kHz is a valid sample rate"); | |
57 static_assert(ValidFullBandRate(16000), | |
58 "Test that 16 kHz is a valid sample rate"); | |
59 static_assert(ValidFullBandRate(32000), | |
60 "Test that 32 kHz is a valid sample rate"); | |
61 static_assert(ValidFullBandRate(48000), | |
62 "Test that 48 kHz is a valid sample rate"); | |
63 static_assert(!ValidFullBandRate(8001), | |
64 "Test that 8001 Hz is not a valid sample rate"); | |
65 | |
66 } // namespace webrtc | |
67 | |
68 #endif // WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_AEC3_CONSTANTS_H_ | |
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