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- // 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.
- #ifndef REMOTING_HOST_AUDIO_VOLUME_FILTER_H_
- #define REMOTING_HOST_AUDIO_VOLUME_FILTER_H_
- #include "remoting/host/audio_silence_detector.h"
- namespace remoting {
- // A component to modify input audio sample to apply the audio level. This class
- // is used on platforms which returns non-adjusted audio samples, e.g. Windows.
- // This class supports frames with 16 bits per sample only.
- class AudioVolumeFilter {
- public:
- // See AudioSilenceDetector for the meaning of |silence_threshold|.
- explicit AudioVolumeFilter(int silence_threshold);
- virtual ~AudioVolumeFilter();
- // Adjusts audio samples in |data|. If the samples are silent before applying
- // the volume level or the GetAudioLevel() returns 0, this function returns
- // false. If |frames| is 0, this function also returns false.
- bool Apply(int16_t* data, size_t frames);
- // Updates the sampling rate and channels.
- void Initialize(int sampling_rate, int channels);
- protected:
- // Returns the volume level in [0, 1]. This should be a normalized scalar
- // value: sample values can be simply multiplied by the result of this
- // function to apply volume.
- virtual float GetAudioLevel() = 0;
- private:
- AudioSilenceDetector silence_detector_;
- };
- } // namespace remoting
- #endif // REMOTING_HOST_AUDIO_VOLUME_FILTER_H_
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