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| 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 #include "webrtc/modules/audio_mixer/sine_wave_generator.h" |
| 12 |
| 13 #include <math.h> |
| 14 |
| 15 #include "webrtc/base/safe_conversions.h" |
| 16 |
| 17 namespace webrtc { |
| 18 |
| 19 namespace { |
| 20 constexpr float kPi = 3.14159265f; |
| 21 } // namespace |
| 22 |
| 23 void SineWaveGenerator::GenerateNextFrame(AudioFrame* frame) { |
| 24 RTC_DCHECK(frame); |
| 25 for (size_t i = 0; i < frame->samples_per_channel_; ++i) { |
| 26 for (size_t ch = 0; ch < frame->num_channels_; ++ch) { |
| 27 frame->data_[frame->num_channels_ * i + ch] = |
| 28 rtc::saturated_cast<int16_t>(amplitude_ * sinf(phase_)); |
| 29 } |
| 30 phase_ += wave_frequency_hz_ * 2 * kPi / frame->sample_rate_hz_; |
| 31 } |
| 32 } |
| 33 } // namespace webrtc |
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