c20978e581
NOPRESUBMIT=True # cpplint errors that aren't caused by this CL. NOTRY=True NOTREECHECKS=True TBR=kwiberg@webrtc.org, kjellander@webrtc.org Bug: webrtc:7634 Change-Id: I3cca0fbaa807b563c95979cccd6d1bec32055f36 Reviewed-on: https://chromium-review.googlesource.com/562156 Commit-Queue: Edward Lemur <ehmaldonado@webrtc.org> Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org> Cr-Commit-Position: refs/heads/master@{#18919}
39 lines
1.3 KiB
C++
39 lines
1.3 KiB
C++
/*
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* Copyright (c) 2017 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 WEBRTC_MODULES_AUDIO_MIXER_GAIN_CHANGE_CALCULATOR_H_
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#define WEBRTC_MODULES_AUDIO_MIXER_GAIN_CHANGE_CALCULATOR_H_
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#include "webrtc/rtc_base/array_view.h"
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namespace webrtc {
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class GainChangeCalculator {
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public:
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// The 'out' signal is assumed to be produced from 'in' by applying
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// a smoothly varying gain. This method computes variations of the
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// gain and handles special cases when the samples are small.
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float CalculateGainChange(rtc::ArrayView<const int16_t> in,
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rtc::ArrayView<const int16_t> out);
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private:
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void CalculateGain(rtc::ArrayView<const int16_t> in,
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rtc::ArrayView<const int16_t> out,
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rtc::ArrayView<float> gain);
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float CalculateDifferences(rtc::ArrayView<const float> values);
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float last_value_ = 0.f;
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float last_reliable_gain_ = 1.0f;
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};
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} // namespace webrtc
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#endif // WEBRTC_MODULES_AUDIO_MIXER_GAIN_CHANGE_CALCULATOR_H_
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