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0b489303d2
Bug: webrtc:12338 Change-Id: I85bff694dd2ead83c939c4d1945eff82e1296001 No-Presubmit: True Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/227161 Commit-Queue: Artem Titov <titovartem@webrtc.org> Reviewed-by: Harald Alvestrand <hta@webrtc.org> Cr-Commit-Position: refs/heads/master@{#34690}
48 lines
1.8 KiB
C++
48 lines
1.8 KiB
C++
/*
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* Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef MODULES_AUDIO_PROCESSING_AGC2_COMPUTE_INTERPOLATED_GAIN_CURVE_H_
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#define MODULES_AUDIO_PROCESSING_AGC2_COMPUTE_INTERPOLATED_GAIN_CURVE_H_
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#include <array>
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#include "modules/audio_processing/agc2/agc2_common.h"
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namespace webrtc {
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namespace test {
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// Parameters for interpolated gain curve using under-approximation to
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// avoid saturation.
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//
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// The saturation gain is defined in order to let hard-clipping occur for
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// those samples having a level that falls in the saturation region. It is an
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// upper bound of the actual gain to apply - i.e., that returned by the
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// limiter.
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// Knee and beyond-knee regions approximation parameters.
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// The gain curve is approximated as a piece-wise linear function.
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// `approx_params_x_` are the boundaries between adjacent linear pieces,
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// `approx_params_m_` and `approx_params_q_` are the slope and the y-intercept
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// values of each piece.
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struct InterpolatedParameters {
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std::array<float, kInterpolatedGainCurveTotalPoints>
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computed_approximation_params_x;
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std::array<float, kInterpolatedGainCurveTotalPoints>
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computed_approximation_params_m;
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std::array<float, kInterpolatedGainCurveTotalPoints>
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computed_approximation_params_q;
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};
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InterpolatedParameters ComputeInterpolatedGainCurveApproximationParams();
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} // namespace test
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} // namespace webrtc
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#endif // MODULES_AUDIO_PROCESSING_AGC2_COMPUTE_INTERPOLATED_GAIN_CURVE_H_
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