AGC2 dummy module: fixed gain param, APM integration, audioproc_f adaptation

webrtc/modules/audio_processing/agc2/digital_gain_applier.cc

-/*
- *  Copyright (c) 2017 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.
- */
-
-#include "webrtc/modules/audio_processing/agc2/digital_gain_applier.h"
-
-#include <algorithm>
-
-namespace webrtc {
-namespace {
-
-constexpr float kMaxSampleValue = 32767.0f;
-constexpr float kMinSampleValue = -32767.0f;
-
-}  // namespace
-
-DigitalGainApplier::DigitalGainApplier() = default;
-
-void DigitalGainApplier::Process(float gain, rtc::ArrayView<float> samples) {
-  if (gain == 1.f) { return; }
-  for (auto& v : samples) { v *= gain; }
-  LimitToAllowedRange(samples);
-}
-
-void DigitalGainApplier::LimitToAllowedRange(rtc::ArrayView<float> x) {
-  for (auto& v : x) {
-    v = std::max(kMinSampleValue, v);
-    v = std::min(kMaxSampleValue, v);
-  }
-}
-
-}  // namespace webrtc