/**
 * Copyright (C) 2020 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 <stdlib.h>
#include <string.h>
#include "aacdecoder_lib.h"

constexpr uint8_t kNumberOfLayers = 1;
constexpr uint8_t kMaxChannelCount = 8;
constexpr uint32_t kNumFillElements = 1200;
constexpr uint32_t kMaxOutBufferSize = 2048 * kMaxChannelCount;

constexpr unsigned char kAdtsHeader[] = { 0xFF, 0xF1, 0x6C, 0x40, 0x41, 0x00,
        0x78 };
constexpr uint32_t kAdtsHeaderLength = sizeof(kAdtsHeader);

constexpr unsigned char kFillElements[] = { 0xC1, 0x83, 0x06, 0x0C, 0x18, 0x30,
        0x60 };
constexpr uint32_t kFillElementsLength = sizeof(kFillElements);

constexpr unsigned char kAacStream[] = { 0x00, 0xC8, 0x13, 0x83, 0xE8, 0x1B,
        0xFF, 0xC4, 0x29, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69,
        0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69,
        0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69,
        0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69,
        0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69,
        0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69,
        0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69,
        0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69,
        0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69,
        0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69,
        0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69,
        0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69,
        0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69,
        0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69,
        0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69,
        0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69,
        0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69,
        0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69,
        0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69,
        0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69,
        0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69,
        0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69,
        0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x77, 0xED, 0x88, 0x52, 0xD2, 0xD2,
        0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2,
        0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2,
        0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2,
        0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2,
        0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2,
        0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2,
        0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2,
        0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2,
        0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2,
        0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2,
        0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2,
        0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2,
        0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2,
        0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2,
        0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2,
        0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2,
        0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2,
        0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2,
        0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2,
        0xD2, 0xE0, 0x2B, 0xFF, 0xC4, 0x29, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69,
        0x69, 0x69, 0x1B, 0xFF, 0xC4, 0x29, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69,
        0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69,
        0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69,
        0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69,
        0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69,
        0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69,
        0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69,
        0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69,
        0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69,
        0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69,
        0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69,
        0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69,
        0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69,
        0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69,
        0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69,
        0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69,
        0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69,
        0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69,
        0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69,
        0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69,
        0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69,
        0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x77, 0xED, 0x88,
        0x52, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2,
        0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2,
        0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2,
        0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2,
        0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2,
        0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2,
        0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2,
        0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2,
        0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2,
        0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2,
        0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2,
        0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2,
        0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2,
        0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2,
        0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2,
        0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2,
        0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2,
        0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2,
        0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2, 0xD2,
        0xD2, 0xD2, 0xD2, 0xD2, 0xE0, 0xE0 };
constexpr uint32_t kAacStreamLength = sizeof(kAacStream);

class Codec {
 public:
    Codec() = default;
    ~Codec() {
        deInitDecoder();
    }
    bool initDecoder();
    void decodeFrames(UCHAR *data, UINT size);
    void deInitDecoder();
 private:
    HANDLE_AACDECODER mAacDecoderHandle = nullptr;
    AAC_DECODER_ERROR mErrorCode = AAC_DEC_OK;
};

bool Codec::initDecoder() {
    mAacDecoderHandle = aacDecoder_Open(TT_MP4_ADTS, kNumberOfLayers);
    if (!mAacDecoderHandle) {
        return false;
    }
    return true;
}

void Codec::deInitDecoder() {
    aacDecoder_Close(mAacDecoderHandle);
    mAacDecoderHandle = nullptr;
}

void Codec::decodeFrames(UCHAR *data, UINT size) {
    while (size > 0) {
        UINT inputSize = size;
        UINT valid = size;
        mErrorCode = aacDecoder_Fill(mAacDecoderHandle, &data, &inputSize,
                                     &valid);
        if (mErrorCode != AAC_DEC_OK) {
            ++data;
            --size;
        } else {
            INT_PCM outputBuf[kMaxOutBufferSize];
            aacDecoder_DecodeFrame(mAacDecoderHandle, outputBuf,
                                   kMaxOutBufferSize, 0);
            if (valid >= inputSize) {
                return;
            }
            UINT offset = inputSize - valid;
            data += offset;
            size = valid;
        }
    }
}

int main() {
    Codec *codec = new Codec();
    if (!codec) {
        return EXIT_FAILURE;
    }

    if (codec->initDecoder()) {
        /* Allocate memory for bitstream buffer */
        UINT rawDataSize = kAdtsHeaderLength + kAacStreamLength
                + (kNumFillElements * kFillElementsLength);

        UCHAR* rawData = (UCHAR *) malloc(rawDataSize);
        if (!rawData) {
            return EXIT_FAILURE;
        }

        /* Copy header, aac stream to bitstream buffer */
        UCHAR* writePtr = rawData;
        memcpy(writePtr, kAdtsHeader, kAdtsHeaderLength);
        writePtr += kAdtsHeaderLength;

        for (uint32_t i = 0; i < kNumFillElements; ++i) {
            memcpy(writePtr, kFillElements, kFillElementsLength);
            writePtr += kFillElementsLength;
        }

        memcpy(writePtr, kAacStream, kAacStreamLength);

        /* Decode bitstream */
        codec->decodeFrames(rawData, rawDataSize);
        free(rawData);
    }

    delete codec;
    return EXIT_SUCCESS;
}