| // Copyright 2017 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "remoting/host/audio_volume_filter.h" |
| |
| namespace remoting { |
| |
| AudioVolumeFilter::AudioVolumeFilter(int silence_threshold) |
| : silence_detector_(silence_threshold) {} |
| AudioVolumeFilter::~AudioVolumeFilter() = default; |
| |
| bool AudioVolumeFilter::Apply(int16_t* data, size_t frames) { |
| if (frames == 0) { |
| return false; |
| } |
| |
| if (silence_detector_.IsSilence(data, frames)) { |
| return false; |
| } |
| |
| float level = GetAudioLevel(); |
| if (level == 0) { |
| return false; |
| } |
| |
| if (level == 1) { |
| return true; |
| } |
| |
| const int sample_count = frames * silence_detector_.channels(); |
| const int32_t level_int = static_cast<int32_t>(level * 65536); |
| for (int i = 0; i < sample_count; i++) { |
| data[i] = (static_cast<int32_t>(data[i]) * level_int) >> 16; |
| } |
| |
| return true; |
| } |
| |
| void AudioVolumeFilter::Initialize(int sampling_rate, int channels) { |
| silence_detector_.Reset(sampling_rate, channels); |
| } |
| |
| } // namespace remoting |