media/libaaudio/src/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) {
    if (framePosition > mLastFramePosition) {
        mLastFramePosition = framePosition;
        mFramesValid = onProcess(framePosition, numFrames);
    }
    return mFramesValid;
}

/***************************************************************************/
AudioFloatBlockPort::AudioFloatBlockPort(AudioProcessorBase &parent,
                               int32_t samplesPerFrame,
                               int32_t framesPerBlock)
        : AudioPort(parent, samplesPerFrame)
        , mFramesPerBlock(framesPerBlock)
        , mSampleBlock(NULL) {
    int32_t numFloats = framesPerBlock * getSamplesPerFrame();
    mSampleBlock = new float[numFloats]{0.0f};
}

AudioFloatBlockPort::~AudioFloatBlockPort() {
    delete[] mSampleBlock;
}

/***************************************************************************/
int32_t AudioFloatOutputPort::pullData(int64_t framePosition, int32_t numFrames) {
    numFrames = std::min(getFramesPerBlock(), 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(getFramesPerBlock(), numFrames)
            : mConnected->pullData(framePosition, numFrames);
}

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

/***************************************************************************/
int32_t AudioSink::pull(int32_t numFrames) {
    int32_t actualFrames = input.pullData(mFramePosition, numFrames);
    mFramePosition += actualFrames;
    return actualFrames;
}