1 // Copyright 2017 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #include "remoting/host/audio_volume_filter.h" 6 7 namespace remoting { 8 AudioVolumeFilter(int silence_threshold)9AudioVolumeFilter::AudioVolumeFilter(int silence_threshold) 10 : silence_detector_(silence_threshold) {} 11 AudioVolumeFilter::~AudioVolumeFilter() = default; 12 Apply(int16_t * data,size_t frames)13bool AudioVolumeFilter::Apply(int16_t* data, size_t frames) { 14 if (frames == 0) { 15 return false; 16 } 17 18 if (silence_detector_.IsSilence(data, frames)) { 19 return false; 20 } 21 22 float level = GetAudioLevel(); 23 if (level == 0) { 24 return false; 25 } 26 27 if (level == 1) { 28 return true; 29 } 30 31 const int sample_count = frames * silence_detector_.channels(); 32 const int32_t level_int = static_cast<int32_t>(level * 65536); 33 for (int i = 0; i < sample_count; i++) { 34 data[i] = (static_cast<int32_t>(data[i]) * level_int) >> 16; 35 } 36 37 return true; 38 } 39 Initialize(int sampling_rate,int channels)40void AudioVolumeFilter::Initialize(int sampling_rate, int channels) { 41 silence_detector_.Reset(sampling_rate, channels); 42 } 43 44 } // namespace remoting 45