| /* |
| * 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 <unistd.h> |
| #include "common/OboeDebug.h" |
| #include "oboe/Definitions.h" |
| #include "SawPingGenerator.h" |
| |
| using namespace oboe::flowgraph; |
| |
| SawPingGenerator::SawPingGenerator() |
| : OscillatorBase() |
| , mRequestCount(0) |
| , mAcknowledgeCount(0) |
| , mLevel(0.0f) { |
| } |
| |
| SawPingGenerator::~SawPingGenerator() { } |
| |
| void SawPingGenerator::reset() { |
| FlowGraphNode::reset(); |
| mAcknowledgeCount.store(mRequestCount.load()); |
| } |
| |
| int32_t SawPingGenerator::onProcess(int numFrames) { |
| |
| const float *frequencies = frequency.getBuffer(); |
| const float *amplitudes = amplitude.getBuffer(); |
| float *buffer = output.getBuffer(); |
| |
| if (mRequestCount.load() > mAcknowledgeCount.load()) { |
| mPhase = -1.0f; |
| mLevel = 1.0; |
| mAcknowledgeCount++; |
| } |
| |
| // Check level to prevent numeric underflow. |
| if (mLevel > 0.000001) { |
| for (int i = 0; i < numFrames; i++) { |
| float sawtooth = incrementPhase(frequencies[i]); |
| *buffer++ = (float) (sawtooth * mLevel * amplitudes[i]); |
| mLevel *= 0.999; |
| } |
| } else { |
| for (int i = 0; i < numFrames; i++) { |
| *buffer++ = 0.0f; |
| } |
| } |
| |
| return numFrames; |
| } |
| |
| void SawPingGenerator::trigger() { |
| mRequestCount++; |
| } |
| |