| /* |
| * Copyright (c) 2016 The WebRTC project authors. All Rights Reserved. |
| * |
| * Use of this source code is governed by a BSD-style license |
| * that can be found in the LICENSE file in the root of the source |
| * tree. An additional intellectual property rights grant can be found |
| * in the file PATENTS. All contributing project authors may |
| * be found in the AUTHORS file in the root of the source tree. |
| */ |
| |
| #ifndef WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_AEC3_CONSTANTS_H_ |
| #define WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_AEC3_CONSTANTS_H_ |
| |
| #include <stddef.h> |
| |
| namespace webrtc { |
| |
| constexpr size_t kFftLengthBy2 = 64; |
| constexpr size_t kFftLengthBy2Plus1 = kFftLengthBy2 + 1; |
| constexpr size_t kFftLength = 2 * kFftLengthBy2; |
| |
| constexpr size_t kMaxNumBands = 3; |
| constexpr size_t kSubFrameLength = 80; |
| |
| constexpr size_t kBlockSize = kFftLengthBy2; |
| constexpr size_t kExtendedBlockSize = 2 * kFftLengthBy2; |
| constexpr size_t kSubBlockSize = 16; |
| |
| constexpr size_t NumBandsForRate(int sample_rate_hz) { |
| return static_cast<size_t>(sample_rate_hz == 8000 ? 1 |
| : sample_rate_hz / 16000); |
| } |
| constexpr int LowestBandRate(int sample_rate_hz) { |
| return sample_rate_hz == 8000 ? sample_rate_hz : 16000; |
| } |
| |
| constexpr bool ValidFullBandRate(int sample_rate_hz) { |
| return sample_rate_hz == 8000 || sample_rate_hz == 16000 || |
| sample_rate_hz == 32000 || sample_rate_hz == 48000; |
| } |
| |
| static_assert(1 == NumBandsForRate(8000), "Number of bands for 8 kHz"); |
| static_assert(1 == NumBandsForRate(16000), "Number of bands for 16 kHz"); |
| static_assert(2 == NumBandsForRate(32000), "Number of bands for 32 kHz"); |
| static_assert(3 == NumBandsForRate(48000), "Number of bands for 48 kHz"); |
| |
| static_assert(8000 == LowestBandRate(8000), "Sample rate of band 0 for 8 kHz"); |
| static_assert(16000 == LowestBandRate(16000), |
| "Sample rate of band 0 for 16 kHz"); |
| static_assert(16000 == LowestBandRate(32000), |
| "Sample rate of band 0 for 32 kHz"); |
| static_assert(16000 == LowestBandRate(48000), |
| "Sample rate of band 0 for 48 kHz"); |
| |
| static_assert(ValidFullBandRate(8000), |
| "Test that 8 kHz is a valid sample rate"); |
| static_assert(ValidFullBandRate(16000), |
| "Test that 16 kHz is a valid sample rate"); |
| static_assert(ValidFullBandRate(32000), |
| "Test that 32 kHz is a valid sample rate"); |
| static_assert(ValidFullBandRate(48000), |
| "Test that 48 kHz is a valid sample rate"); |
| static_assert(!ValidFullBandRate(8001), |
| "Test that 8001 Hz is not a valid sample rate"); |
| |
| } // namespace webrtc |
| |
| #endif // WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_AEC3_CONSTANTS_H_ |