/*
* Copyright 2017-2024 NVIDIA Corporation.  All rights reserved.
*
* Please refer to the NVIDIA end user license agreement (EULA) associated
* with this source code for terms and conditions that govern your use of
* this software. Any use, reproduction, disclosure, or distribution of
* this software and related documentation outside the terms of the EULA
* is strictly prohibited.
*
*/

/**
*  This sample application demonstrates transcoding of an input video stream.
*  If requested by the user, the bit-depth of the decoded content will be
*  converted to the target bit-depth before encoding. The only supported
*  conversions are from 8 bit to 10 bit (per component) and vice versa.
*/

#include <cuda.h>
#include <cuda_runtime.h>
#include <iostream>
#include <memory>
#include <functional>
#include <iomanip>
#include "NvEncoder/NvEncoderCuda.h"
#include "NvDecoder/NvDecoder.h"
#include "../Utils/NvCodecUtils.h"
#include "../Utils/NvEncoderCLIOptions.h"
#include "../Utils/FFmpegDemuxer.h"
#include "../Utils/FFmpegMuxer.h"

simplelogger::Logger *logger = simplelogger::LoggerFactory::CreateConsoleLogger();

static void ShowBriefHelp()
{
    std::ostringstream oss;
    oss << "NVIDIA Video Transcoder Sample Application\n";
    oss << "====================================\n\n";
    
    oss << "Usage: AppTrans -i <input_file> [options]\n\n";

    // Brief table of core arguments
    oss << "Common Arguments:\n";
    oss << std::left << std::setw(25) << "Argument" 
        << std::setw(12) << "Type"
        << "Default Value\n";
    oss << std::string(50, '-') << "\n";

    oss << std::left << std::setw(25) << "-i <path>" 
        << std::setw(12) << "Required"
        << "N/A\n";
    oss << std::left << std::setw(25) << "-o <path>" 
        << std::setw(12) << "Optional"
        << "codec-based\n";
    oss << std::left << std::setw(25) << "-ob <depth>" 
        << std::setw(12) << "Optional"
        << "Input depth\n";
    oss << std::left << std::setw(25) << "-gpu <n>" 
        << std::setw(12) << "Optional"
        << "0\n";

    oss << "\nFor detailed help, use -A/--advanced-options\n";
    std::cout << oss.str();
    exit(0);
}

static void ShowHelpAdvanced()
{
    std::ostringstream oss;
    oss << "NVIDIA Video Transcoder Sample Application\n";
    oss << "====================================\n\n";
    
    oss << "Usage: AppTrans -i <input_file> [options]\n\n";

    // Detailed descriptions
    oss << "Basic Options:\n";
    oss << std::left << std::setw(25) << "-i <path>" << ": Input video file to transcode\n";
    oss << std::left << std::setw(25) << "-o <path>" << ": Output file (.mp4/.mov for containers)\n";
    oss << std::left << std::setw(25) << "-ob <depth>" << ": Output bit depth (8 or 10)\n";
    oss << std::left << std::setw(25) << "-gpu <n>" << ": GPU device ordinal\n";
    oss << std::left << std::setw(25) << "-h/--help" << ": Print basic usage information\n";
    oss << std::left << std::setw(25) << "-A/--advanced-options" << ": Print detailed usage information\n";

    // Important notes
    oss << "\nNotes:\n";
    oss << "------\n";
    oss << "* Supports bit-depth conversion between 8-bit and 10-bit\n";
    oss << "* Output format is elementary stream if container not specified\n";
    oss << "* Default output filename is out.<codec> if not specified\n";
    oss << "* YUV444 format is not supported\n";
    oss << std::endl;

    // Encoder Parameters
    oss << "Encoder Parameters:\n";
    oss << NvEncoderInitParam().GetHelpMessage(false, false, true);
    
    std::cout << oss.str();
    exit(0);
}

void ShowHelpAndExit(const char *szBadOption = NULL)
{
    if (szBadOption) 
    {
        std::ostringstream oss;
        oss << "Error parsing \"" << szBadOption << "\"\n";
        oss << "Use -h/--help for basic usage or -A/--advanced-options for detailed information\n";
        throw std::invalid_argument(oss.str());
    }
}

void ParseCommandLine(int argc, char *argv[], char *szInputFileName, char *szOutputFileName, int &nOutBitDepth, int &iGpu, NvEncoderInitParam &initParam) 
{
    std::ostringstream oss;
    int i;

    if (argc == 1) {
        std::cout << "No Arguments provided! Please refer to the following for options:\n";
        ShowBriefHelp();
    }

    for (i = 1; i < argc; i++)
    {
        if (!_stricmp(argv[i], "-h") || !_stricmp(argv[i], "--help"))
        {
            ShowBriefHelp();
        }
        if (!_stricmp(argv[i], "-A") || !_stricmp(argv[i], "--advanced-options"))
        {
            ShowHelpAdvanced();
        }

        if (!_stricmp(argv[i], "-i"))
        {
            if (++i == argc)
            {
                ShowHelpAndExit("-i");
            }
            sprintf(szInputFileName, "%s", argv[i]);
            continue;
        }
        if (!_stricmp(argv[i], "-o"))
        {
            if (++i == argc)
            {
                ShowHelpAndExit("-o");
            }
            sprintf(szOutputFileName, "%s", argv[i]);
            continue;
        }
        if (!_stricmp(argv[i], "-ob"))
        {
            if (++i == argc)
            {
                ShowHelpAndExit("-ob");
            }
            nOutBitDepth = atoi(argv[i]);
            if (nOutBitDepth != 8 && nOutBitDepth != 10) 
            {
                ShowHelpAndExit("-ob");
            }
            continue;
        }
        if (!_stricmp(argv[i], "-gpu")) 
        {
            if (++i == argc)
            {
                ShowHelpAndExit("-gpu");
            }
            iGpu = atoi(argv[i]);
            continue;
        }
        // Regard as encoder parameter
        if (argv[i][0] != '-') 
        {
            ShowHelpAndExit(argv[i]);
        }
        oss << argv[i] << " ";
        while (i + 1 < argc && argv[i + 1][0] != '-') 
        {
            oss << argv[++i] << " ";
        }
    }
    initParam = NvEncoderInitParam(oss.str().c_str());
}

int main(int argc, char **argv) {
    char szInFilePath[260] = "";
    char szOutFilePath[260] = "";
    int nOutBitDepth = 0;
    int iGpu = 0;
    try
    {
        using NvEncCudaPtr = std::unique_ptr<NvEncoderCuda, std::function<void(NvEncoderCuda*)>>;
        auto EncodeDeleteFunc = [](NvEncoderCuda *pEnc)
        {
            if (pEnc)
            {
                pEnc->DestroyEncoder();
                delete pEnc;
            }
        };

        // Delay instantiating the encoder until we've decoded some frames.
        NvEncCudaPtr pEnc(nullptr, EncodeDeleteFunc);

        NvEncoderInitParam encodeCLIOptions;
        ParseCommandLine(argc, argv, szInFilePath, szOutFilePath, nOutBitDepth, iGpu, encodeCLIOptions);

        CheckInputFile(szInFilePath);

        if (!*szOutFilePath) {
            sprintf(szOutFilePath, encodeCLIOptions.IsCodecH264() ? "out.h264" : encodeCLIOptions.IsCodecHEVC() ? "out.hevc" : "out.av1");
        }

        std::ifstream fpIn(szInFilePath, std::ifstream::in | std::ifstream::binary);
        if (!fpIn)
        {
            std::ostringstream err;
            err << "Unable to open input file: " << szInFilePath << std::endl;
            throw std::invalid_argument(err.str());
        }

        FFmpegDemuxer demuxer(szInFilePath);

        MEDIA_FORMAT mediaFormat = GetMediaFormat(szOutFilePath);
        std::unique_ptr<std::ofstream> fpOut;
        std::unique_ptr<FFmpegMuxer> muxer;

        if (mediaFormat == MEDIA_FORMAT_ELEMENTARY)
        {
            fpOut = std::unique_ptr<std::ofstream>(new std::ofstream(szOutFilePath, std::ios::out | std::ios::binary));
            if (!fpOut)
            {
                std::ostringstream err;
                err << "Unable to open output file: " << szOutFilePath << std::endl;
                throw std::invalid_argument(err.str());
            }
        }
        else
        {
            muxer = std::unique_ptr<FFmpegMuxer>(new FFmpegMuxer(szOutFilePath, mediaFormat, demuxer.GetAVFormatContext(),
                encodeCLIOptions.IsCodecH264() ? AV_CODEC_ID_H264 : encodeCLIOptions.IsCodecHEVC() ? AV_CODEC_ID_HEVC : AV_CODEC_ID_AV1,
                demuxer.GetWidth(), demuxer.GetHeight()));
        }

        ck(cuInit(0));
        int nGpu = 0;
        ck(cuDeviceGetCount(&nGpu));
        if (iGpu < 0 || iGpu >= nGpu) {
            std::cout << "GPU ordinal out of range. Should be within [" << 0 << ", " << nGpu - 1 << "]" << std::endl;
            return 1;
        }
        CUdevice cuDevice = 0;
        ck(cuDeviceGet(&cuDevice, iGpu));
        char szDeviceName[80];
        ck(cuDeviceGetName(szDeviceName, sizeof(szDeviceName), cuDevice));
        std::cout << "GPU in use: " << szDeviceName << std::endl;
        CUcontext cuContext = NULL;
        ck(NVCODEC_CUDA_CTX_CREATE(&cuContext, 0, cuDevice));

        if (demuxer.GetChromaFormat() == AV_PIX_FMT_YUV444P || demuxer.GetChromaFormat() == AV_PIX_FMT_YUV444P10LE || demuxer.GetChromaFormat() == AV_PIX_FMT_YUV444P12LE)
        {
            std::cout << "Error: Sample app doesn't support YUV444" << std::endl;
            return 1;
        }
        NvDecoder dec(cuContext, true, FFmpeg2NvCodecId(demuxer.GetVideoCodec()), false, true);

        int nBytes = 0, nFrameReturned = 0, nFrame = 0, isVideoPacket = 0, streamIndex = -1, numb = 0;
        int64_t pts, dts;
        uint8_t *pData = NULL, *pFrame = NULL;
        bool bOut10 = false;
        CUdeviceptr dpFrame = 0;
        NV_ENC_PIC_PARAMS picParams = { NV_ENC_PIC_PARAMS_VER };
        std::vector<int64_t> vDts, vPts;
        do {
            demuxer.Demux(&pData, &nBytes, &pts, &dts, &isVideoPacket, &streamIndex);
            if (!isVideoPacket)
            {
                if (mediaFormat != MEDIA_FORMAT_ELEMENTARY)
                {
                     muxer->Mux(pData, nBytes, pts, dts, streamIndex);
                }
                continue;
            }

            nFrameReturned = dec.Decode(pData, nBytes, 0, pts);
            for (int i = 0; i < nFrameReturned; i++)
            {
                pFrame = dec.GetFrame(&pts);
                vPts.push_back(pts);
                vDts.push_back(pts);
                if (!pEnc)
                {
                    // We've successfully decoded some frames; create an encoder now.

                    bOut10 = nOutBitDepth ? nOutBitDepth > 8 : dec.GetBitDepth() > 8;
                    pEnc.reset(new NvEncoderCuda(cuContext, dec.GetWidth(), dec.GetHeight(),
                        bOut10 ? NV_ENC_BUFFER_FORMAT_YUV420_10BIT : NV_ENC_BUFFER_FORMAT_NV12));

                    NV_ENC_INITIALIZE_PARAMS initializeParams = { NV_ENC_INITIALIZE_PARAMS_VER };
                    NV_ENC_CONFIG encodeConfig = { NV_ENC_CONFIG_VER };
                    initializeParams.encodeConfig = &encodeConfig;
                    pEnc->CreateDefaultEncoderParams(&initializeParams, encodeCLIOptions.GetEncodeGUID(), encodeCLIOptions.GetPresetGUID(), encodeCLIOptions.GetTuningInfo());

                    encodeCLIOptions.SetInitParams(&initializeParams, bOut10 ? NV_ENC_BUFFER_FORMAT_YUV420_10BIT : NV_ENC_BUFFER_FORMAT_NV12);

                    pEnc->CreateEncoder(&initializeParams);
                    if (initializeParams.encodeConfig->frameIntervalP)
                        numb = initializeParams.encodeConfig->frameIntervalP - 1;
                }

                std::vector<NvEncOutputFrame> vPacket;
                const NvEncInputFrame* encoderInputFrame = pEnc->GetNextInputFrame();

                picParams.inputTimeStamp = pts;
                if ((bOut10 && dec.GetBitDepth() > 8) || (!bOut10 && dec.GetBitDepth() == 8))
                {
                    NvEncoderCuda::CopyToDeviceFrame(cuContext,
                        pFrame,
                        dec.GetDeviceFramePitch(),
                        (CUdeviceptr)encoderInputFrame->inputPtr,
                        encoderInputFrame->pitch,
                        pEnc->GetEncodeWidth(),
                        pEnc->GetEncodeHeight(),
                        CU_MEMORYTYPE_DEVICE,
                        encoderInputFrame->bufferFormat,
                        encoderInputFrame->chromaOffsets,
                        encoderInputFrame->numChromaPlanes);
                    pEnc->EncodeFrame(vPacket, &picParams);
                }
                else
                {
                    // Bit depth conversion is needed
                    if (bOut10)
                    {
                        ConvertUInt8ToUInt16(pFrame, (uint16_t *)encoderInputFrame->inputPtr, dec.GetDeviceFramePitch(), encoderInputFrame->pitch,
                            pEnc->GetEncodeWidth(),
                            pEnc->GetEncodeHeight() + ((pEnc->GetEncodeHeight() + 1) / 2));
                    }
                    else
                    {
                        ConvertUInt16ToUInt8((uint16_t *)pFrame, (uint8_t *)encoderInputFrame->inputPtr, dec.GetDeviceFramePitch(), encoderInputFrame->pitch,
                            pEnc->GetEncodeWidth(),
                            pEnc->GetEncodeHeight() + ((pEnc->GetEncodeHeight() + 1) / 2));
                    }
                    pEnc->EncodeFrame(vPacket, &picParams);
                }
                for (int i = 0; i < (int)vPacket.size(); i++)
                {
                    if (mediaFormat == MEDIA_FORMAT_ELEMENTARY)
                    {
                        fpOut->write(reinterpret_cast<char*>(vPacket[i].frame.data()), vPacket[i].frame.size());
                    }
                    else
                    {
                        muxer->Mux(reinterpret_cast<unsigned char*>(vPacket[i].frame.data()), vPacket[i].frame.size(), vDts[vPacket[i].timeStamp], vPts.front(), streamIndex, vPacket[i].pictureType == NV_ENC_PIC_TYPE_IDR, numb);
                        vPts.erase(vPts.begin());
                    }
                    nFrame++;
                }
            }
        } while (nBytes);

        if (pEnc)
        {
            std::vector<NvEncOutputFrame> vPacket;
            pEnc->EndEncode(vPacket);
            for (int i = 0; i < (int)vPacket.size(); i++)
            {
                if (mediaFormat == MEDIA_FORMAT_ELEMENTARY)
                {
                    fpOut->write(reinterpret_cast<char*>(vPacket[i].frame.data()), vPacket[i].frame.size());
                }
                else
                {
                    muxer->Mux(reinterpret_cast<unsigned char*>(vPacket[i].frame.data()), vPacket[i].frame.size(), vDts[vPacket[i].timeStamp], vPts.front(), streamIndex);
                    vPts.erase(vPts.begin());
                }
                nFrame++;
            }
            std::cout << std::endl;
        }

        fpIn.close();
        if (mediaFormat == MEDIA_FORMAT_ELEMENTARY)
        {
            fpOut->close();
        }

        std::cout << "Total frame transcoded: " << nFrame << std::endl << "Saved in file " << szOutFilePath << " of " << (bOut10 ? 10 : 8) << " bit depth" << std::endl;

        return 0;
    }
    catch (const std::exception& ex)
    {
        std::cout << ex.what();
        exit(1);
    }
    return 0;
}