| /* |
| * Copyright 2015 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include <math.h> |
| #include <unistd.h> |
| |
| #include "SineOscillator.h" |
| |
| SineOscillator::SineOscillator() |
| : OscillatorBase() { |
| } |
| |
| int32_t SineOscillator::onProcess( |
| int64_t framePosition, |
| int numFrames) { |
| |
| frequency.pullData(framePosition, numFrames); |
| amplitude.pullData(framePosition, numFrames); |
| |
| const float *frequencies = frequency.getBlock(); |
| const float *amplitudes = amplitude.getBlock(); |
| float *buffer = output.getBlock(); |
| |
| // Generate sine wave. |
| for (int i = 0; i < numFrames; i++) { |
| float phase = incrementPhase(frequencies[i]); // phase ranges from -1 to +1 |
| *buffer++ = sinf(phase * M_PI) * amplitudes[i]; |
| } |
| |
| return numFrames; |
| } |