| /* |
| * Copyright (c) 2018 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 MODULES_AUDIO_PROCESSING_AGC2_RNN_VAD_COMMON_H_ |
| #define MODULES_AUDIO_PROCESSING_AGC2_RNN_VAD_COMMON_H_ |
| |
| #include <stddef.h> |
| |
| namespace webrtc { |
| namespace rnn_vad { |
| |
| constexpr double kPi = 3.14159265358979323846; |
| |
| constexpr int kSampleRate24kHz = 24000; |
| constexpr int kFrameSize10ms24kHz = kSampleRate24kHz / 100; |
| constexpr int kFrameSize20ms24kHz = kFrameSize10ms24kHz * 2; |
| |
| // Pitch buffer. |
| constexpr int kMinPitch24kHz = kSampleRate24kHz / 800; // 0.00125 s. |
| constexpr int kMaxPitch24kHz = kSampleRate24kHz / 62.5; // 0.016 s. |
| constexpr int kBufSize24kHz = kMaxPitch24kHz + kFrameSize20ms24kHz; |
| static_assert((kBufSize24kHz & 1) == 0, "The buffer size must be even."); |
| |
| // 24 kHz analysis. |
| // Define a higher minimum pitch period for the initial search. This is used to |
| // avoid searching for very short periods, for which a refinement step is |
| // responsible. |
| constexpr int kInitialMinPitch24kHz = 3 * kMinPitch24kHz; |
| static_assert(kMinPitch24kHz < kInitialMinPitch24kHz, ""); |
| static_assert(kInitialMinPitch24kHz < kMaxPitch24kHz, ""); |
| static_assert(kMaxPitch24kHz > kInitialMinPitch24kHz, ""); |
| // Number of (inverted) lags during the initial pitch search phase at 24 kHz. |
| constexpr int kInitialNumLags24kHz = kMaxPitch24kHz - kInitialMinPitch24kHz; |
| // Number of (inverted) lags during the pitch search refinement phase at 24 kHz. |
| constexpr int kRefineNumLags24kHz = kMaxPitch24kHz + 1; |
| static_assert( |
| kRefineNumLags24kHz > kInitialNumLags24kHz, |
| "The refinement step must search the pitch in an extended pitch range."); |
| |
| // 12 kHz analysis. |
| constexpr int kSampleRate12kHz = 12000; |
| constexpr int kFrameSize10ms12kHz = kSampleRate12kHz / 100; |
| constexpr int kFrameSize20ms12kHz = kFrameSize10ms12kHz * 2; |
| constexpr int kBufSize12kHz = kBufSize24kHz / 2; |
| constexpr int kInitialMinPitch12kHz = kInitialMinPitch24kHz / 2; |
| constexpr int kMaxPitch12kHz = kMaxPitch24kHz / 2; |
| static_assert(kMaxPitch12kHz > kInitialMinPitch12kHz, ""); |
| // The inverted lags for the pitch interval [|kInitialMinPitch12kHz|, |
| // |kMaxPitch12kHz|] are in the range [0, |kNumLags12kHz|]. |
| constexpr int kNumLags12kHz = kMaxPitch12kHz - kInitialMinPitch12kHz; |
| |
| // 48 kHz constants. |
| constexpr int kMinPitch48kHz = kMinPitch24kHz * 2; |
| constexpr int kMaxPitch48kHz = kMaxPitch24kHz * 2; |
| |
| // Spectral features. |
| constexpr int kNumBands = 22; |
| constexpr int kNumLowerBands = 6; |
| static_assert((0 < kNumLowerBands) && (kNumLowerBands < kNumBands), ""); |
| constexpr int kCepstralCoeffsHistorySize = 8; |
| static_assert(kCepstralCoeffsHistorySize > 2, |
| "The history size must at least be 3 to compute first and second " |
| "derivatives."); |
| |
| constexpr int kFeatureVectorSize = 42; |
| |
| } // namespace rnn_vad |
| } // namespace webrtc |
| |
| #endif // MODULES_AUDIO_PROCESSING_AGC2_RNN_VAD_COMMON_H_ |