apps/OboeTester/app/src/main/cpp/flowgraph/AudioProcessorBase.cpp

/*
 * 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 <algorithm>
#include <sys/types.h>
#include "AudioProcessorBase.h"

using namespace flowgraph;

/***************************************************************************/
int32_t AudioProcessorBase::pullData(int64_t framePosition, int32_t numFrames) {
    int32_t frameCount = numFrames;
    // Prevent recursion and multiple execution of nodes.
    if (framePosition > mLastFramePosition) {
        mLastFramePosition = framePosition;
        // Pull from all the upstream nodes.
        for (auto &port : mInputPorts) {
            frameCount = port.get().pullData(framePosition, frameCount);
        }
        if (frameCount > 0) {
            mFramesValid = onProcess(frameCount);
        }
    }
    return mFramesValid;
}

/***************************************************************************/
AudioFloatBufferPort::AudioFloatBufferPort(AudioProcessorBase &parent,
                               int32_t samplesPerFrame,
                               int32_t framesPerBuffer)
        : AudioPort(parent, samplesPerFrame)
        , mFramesPerBuffer(framesPerBuffer)
        , mBuffer(NULL) {
    int32_t numFloats = framesPerBuffer * getSamplesPerFrame();
    mBuffer = std::make_unique<float[]>(numFloats);
}

/***************************************************************************/
int32_t AudioFloatOutputPort::pullData(int64_t framePosition, int32_t numFrames) {
    numFrames = std::min(getFramesPerBuffer(), numFrames);
    return mParent.pullData(framePosition, numFrames);
}

// These need to be in the .cpp file because of forward cross references.
void AudioFloatOutputPort::connect(AudioFloatInputPort *port) {
    port->connect(this);
}

void AudioFloatOutputPort::disconnect(AudioFloatInputPort *port) {
    port->disconnect(this);
}

/***************************************************************************/
int32_t AudioFloatInputPort::pullData(int64_t framePosition, int32_t numFrames) {
    return (mConnected == NULL)
            ? std::min(getFramesPerBuffer(), numFrames)
            : mConnected->pullData(framePosition, numFrames);
}

float *AudioFloatInputPort::getBuffer() {
    if (mConnected == NULL) {
        return AudioFloatBufferPort::getBuffer(); // loaded using setValue()
    } else {
        return mConnected->getBuffer();
    }
}