apps/OboeTester/app/src/main/cpp/FormatConverterBox.h

/*
 * Copyright 2021 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.
 */

#ifndef OBOETESTER_FORMAT_CONVERTER_BOX_H
#define OBOETESTER_FORMAT_CONVERTER_BOX_H

#include <unistd.h>
#include <sys/types.h>

#include "oboe/Oboe.h"
#include "flowgraph/SinkFloat.h"
#include "flowgraph/SinkI16.h"
#include "flowgraph/SinkI24.h"
#include "flowgraph/SinkI32.h"
#include "flowgraph/SourceFloat.h"
#include "flowgraph/SourceI16.h"
#include "flowgraph/SourceI24.h"
#include "flowgraph/SourceI32.h"

/**
 * Use flowgraph modules to convert between the various data formats.
 *
 * Note that this does not do channel conversions.
 */

class FormatConverterBox {
public:
    FormatConverterBox(int32_t numSamples,
                       oboe::AudioFormat inputFormat,
                       oboe::AudioFormat outputFormat);

    /**
     * @return internal buffer used to store input data
     */
    void *getOutputBuffer() {
        return (void *) mOutputBuffer.get();
    };
    /**
     * @return internal buffer used to store output data
     */
    void *getInputBuffer() {
        return (void *) mInputBuffer.get();
    };

    /** Convert the data from inputFormat to outputFormat
     * using both internal buffers.
     */
    int32_t convertInternalBuffers(int32_t numSamples);

    /**
     * Convert data from external buffer into internal output buffer.
     * @param numSamples
     * @param inputBuffer
     * @return
     */
    int32_t convertToInternalOutput(int32_t numSamples, const void *inputBuffer);

    /**
     *
     * Convert data from internal input buffer into external output buffer.
     * @param outputBuffer
     * @param numSamples
     * @return
     */
    int32_t convertFromInternalInput(void *outputBuffer, int32_t numSamples);

    /**
     * Convert data formats between the specified external buffers.
     * @param outputBuffer
     * @param numSamples
     * @param inputBuffer
     * @return
     */
    int32_t convert(void *outputBuffer, int32_t numSamples, const void *inputBuffer);

private:
    oboe::AudioFormat mInputFormat{oboe::AudioFormat::Invalid};
    oboe::AudioFormat mOutputFormat{oboe::AudioFormat::Invalid};

    std::unique_ptr<uint8_t[]> mInputBuffer;
    std::unique_ptr<uint8_t[]> mOutputBuffer;

    std::unique_ptr<oboe::flowgraph::FlowGraphSourceBuffered>  mSource;
    std::unique_ptr<oboe::flowgraph::FlowGraphSink>  mSink;
};


#endif //OBOETESTER_FORMAT_CONVERTER_BOX_H