4d4cce8b3f
This CL replaces KissFFT with PFFFT for the spectral features computation. Remarks: - Extra FFT output vector copy eliminated - Scaling and windowing merged into a single vector for efficiency - Nyquist frequency hack to keep the iteration in BandFeaturesExtractor::ComputeSpectralCrossCorrelation simple Bug: webrtc:9577, webrtc:10480 Change-Id: I436563bd257f66a243f5402be270ffcf859bd184 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/130221 Commit-Queue: Alessio Bazzica <alessiob@webrtc.org> Reviewed-by: Per Åhgren <peah@webrtc.org> Cr-Commit-Position: refs/heads/master@{#27536}
70 lines
2.8 KiB
C++
70 lines
2.8 KiB
C++
/*
|
|
* 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_
|
|
|
|
namespace webrtc {
|
|
namespace rnn_vad {
|
|
|
|
constexpr double kPi = 3.14159265358979323846;
|
|
|
|
constexpr size_t kSampleRate24kHz = 24000;
|
|
constexpr size_t kFrameSize10ms24kHz = kSampleRate24kHz / 100;
|
|
constexpr size_t kFrameSize20ms24kHz = kFrameSize10ms24kHz * 2;
|
|
|
|
// Pitch buffer.
|
|
constexpr size_t kMinPitch24kHz = kSampleRate24kHz / 800; // 0.00125 s.
|
|
constexpr size_t kMaxPitch24kHz = kSampleRate24kHz / 62.5; // 0.016 s.
|
|
constexpr size_t 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 size_t kInitialMinPitch24kHz = 3 * kMinPitch24kHz;
|
|
static_assert(kMinPitch24kHz < kInitialMinPitch24kHz, "");
|
|
static_assert(kInitialMinPitch24kHz < kMaxPitch24kHz, "");
|
|
static_assert(kMaxPitch24kHz > kInitialMinPitch24kHz, "");
|
|
constexpr size_t kNumInvertedLags24kHz = kMaxPitch24kHz - kInitialMinPitch24kHz;
|
|
|
|
// 12 kHz analysis.
|
|
constexpr size_t kSampleRate12kHz = 12000;
|
|
constexpr size_t kFrameSize10ms12kHz = kSampleRate12kHz / 100;
|
|
constexpr size_t kFrameSize20ms12kHz = kFrameSize10ms12kHz * 2;
|
|
constexpr size_t kBufSize12kHz = kBufSize24kHz / 2;
|
|
constexpr size_t kInitialMinPitch12kHz = kInitialMinPitch24kHz / 2;
|
|
constexpr size_t kMaxPitch12kHz = kMaxPitch24kHz / 2;
|
|
static_assert(kMaxPitch12kHz > kInitialMinPitch12kHz, "");
|
|
// The inverted lags for the pitch interval [|kInitialMinPitch12kHz|,
|
|
// |kMaxPitch12kHz|] are in the range [0, |kNumInvertedLags12kHz|].
|
|
constexpr size_t kNumInvertedLags12kHz = kMaxPitch12kHz - kInitialMinPitch12kHz;
|
|
|
|
// 48 kHz constants.
|
|
constexpr size_t kMinPitch48kHz = kMinPitch24kHz * 2;
|
|
constexpr size_t kMaxPitch48kHz = kMaxPitch24kHz * 2;
|
|
|
|
// Spectral features.
|
|
constexpr size_t kNumBands = 22;
|
|
constexpr size_t kNumLowerBands = 6;
|
|
static_assert((0 < kNumLowerBands) && (kNumLowerBands < kNumBands), "");
|
|
constexpr size_t kCepstralCoeffsHistorySize = 8;
|
|
static_assert(kCepstralCoeffsHistorySize > 2,
|
|
"The history size must at least be 3 to compute first and second "
|
|
"derivatives.");
|
|
|
|
constexpr size_t kFeatureVectorSize = 42;
|
|
|
|
} // namespace rnn_vad
|
|
} // namespace webrtc
|
|
|
|
#endif // MODULES_AUDIO_PROCESSING_AGC2_RNN_VAD_COMMON_H_
|