sine_wave_generator.h (1154B)
1 /* 2 * Copyright (c) 2017 The WebRTC project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #ifndef MODULES_AUDIO_MIXER_SINE_WAVE_GENERATOR_H_ 12 #define MODULES_AUDIO_MIXER_SINE_WAVE_GENERATOR_H_ 13 14 #include <stdint.h> 15 16 #include "api/audio/audio_frame.h" 17 #include "rtc_base/checks.h" 18 19 namespace webrtc { 20 21 class SineWaveGenerator { 22 public: 23 SineWaveGenerator(float wave_frequency_hz, int16_t amplitude) 24 : wave_frequency_hz_(wave_frequency_hz), amplitude_(amplitude) { 25 RTC_DCHECK_GT(wave_frequency_hz, 0); 26 } 27 28 // Produces appropriate output based on frame->num_channels_, 29 // frame->sample_rate_hz_. 30 void GenerateNextFrame(AudioFrame* frame); 31 32 private: 33 float phase_ = 0.f; 34 const float wave_frequency_hz_; 35 const int16_t amplitude_; 36 }; 37 38 } // namespace webrtc 39 40 #endif // MODULES_AUDIO_MIXER_SINE_WAVE_GENERATOR_H_