rocm-systems/samples/jpegDecodeMultiThreads/jpegdecodemultithreads.cpp

/*
Copyright (c) 2024 Advanced Micro Devices, Inc. All rights reserved.

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The above copyright notice and this permission notice shall be included in
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*/

#include "../rocjpeg_samples_utils.h"

void ThreadFunction(std::vector<std::string>& jpegFiles, RocJpegHandle rocjpeg_handle, RocJpegStreamHandle rocjpeg_stream, RocJpegUtils rocjpeg_util, RocJpegImage *output_image, std::mutex &mutex,
    RocJpegDecodeParams &decode_params, bool save_images, std::string &output_file_path, uint64_t *num_decoded_images, double *image_size_in_mpixels) {

    std::vector<char> file_data;
    uint8_t num_components;
    uint32_t widths[ROCJPEG_MAX_COMPONENT] = {};
    uint32_t heights[ROCJPEG_MAX_COMPONENT] = {};
    uint32_t channel_sizes[ROCJPEG_MAX_COMPONENT] = {};
    uint32_t prior_channel_sizes[ROCJPEG_MAX_COMPONENT] = {};
    RocJpegChromaSubsampling subsampling;
    std::string chroma_sub_sampling = "";
    uint32_t num_channels = 0;

    while (true) {
        // Get the next JPEG file to process
        std::string file_path;
        {
            std::lock_guard<std::mutex> lock(mutex);
            if (!jpegFiles.empty()) {
                file_path = jpegFiles.front();
                jpegFiles.erase(jpegFiles.begin());
            }
        }
        if (file_path.empty()) {
            // No more files to process
            break;
        }

        std::string base_file_name = file_path.substr(file_path.find_last_of("/\\") + 1);
        // Read an image from disk.
        std::ifstream input(file_path.c_str(), std::ios::in | std::ios::binary | std::ios::ate);
        if (!(input.is_open())) {
            std::cerr << "ERROR: Cannot open image: " << file_path << std::endl;
            return;
        }
        // Get the size
        std::streamsize file_size = input.tellg();
        input.seekg(0, std::ios::beg);
        // resize if buffer is too small
        if (file_data.size() < file_size) {
            file_data.resize(file_size);
        }
        if (!input.read(file_data.data(), file_size)) {
            std::cerr << "ERROR: Cannot read from file: " << file_path << std::endl;
            return;
        }

        CHECK_ROCJPEG(rocJpegStreamParse(reinterpret_cast<uint8_t *>(file_data.data()), file_size, rocjpeg_stream));
        CHECK_ROCJPEG(rocJpegGetImageInfo(rocjpeg_handle, rocjpeg_stream, &num_components, &subsampling, widths, heights));
        if (subsampling == ROCJPEG_CSS_411) {
            std::cout << "The chroma sub-sampling is not supported by VCN Hardware" << std::endl;
            std::cout << "Skipping decoding file " << base_file_name << std::endl;
            return;
        }

        if (rocjpeg_util.GetChannelPitchAndSizes(decode_params.output_format, subsampling, widths, heights, num_channels, *output_image, channel_sizes)) {
                std::cerr << "ERROR: Failed to get the channel pitch and sizes" << std::endl;
                return;
        }

        // allocate memory for each channel
        for (int i = 0; i < num_channels; i++) {
            if (prior_channel_sizes[i] != channel_sizes[i]) {
                if (output_image->channel[i] != nullptr) {
                    CHECK_HIP(hipFree((void*)output_image->channel[i]));
                    output_image->channel[i] = nullptr;
                }
                CHECK_HIP(hipMalloc(&output_image->channel[i], channel_sizes[i]));
            }
        }

        CHECK_ROCJPEG(rocJpegDecode(rocjpeg_handle, rocjpeg_stream, &decode_params, output_image));
        *image_size_in_mpixels += (static_cast<double>(widths[0]) * static_cast<double>(heights[0]) / 1000000);
        *num_decoded_images += 1;

        if (save_images) {
            std::string image_save_path = output_file_path;
            rocjpeg_util.GetOutputFileExt(decode_params.output_format, base_file_name, widths[0], heights[0], image_save_path);
            rocjpeg_util.SaveImage(image_save_path, output_image, widths[0], heights[0], subsampling, decode_params.output_format);
        }

        for (int i = 0; i < ROCJPEG_MAX_COMPONENT; i++) {
            prior_channel_sizes[i] = channel_sizes[i];
        }

    }
}

int main(int argc, char **argv) {
    int device_id = 0;
    bool save_images = false;
    int num_threads = 2;
    int total_images_all = 0;
    double image_per_sec_all = 0;
    std::string input_path, output_file_path;
    std::vector<std::string> file_paths = {};
    bool is_dir = false;
    bool is_file = false;
    RocJpegChromaSubsampling subsampling;
    RocJpegBackend rocjpeg_backend = ROCJPEG_BACKEND_HARDWARE;
    RocJpegDecodeParams decode_params = {};
    std::vector<RocJpegHandle> rocjpeg_handles;
    std::vector<RocJpegStreamHandle> rocjpeg_streams;
    std::mutex mutex;
    std::vector<uint64_t> num_decoded_images_per_thread;
    std::vector<double> image_size_in_mpixels_per_thread;
    std::vector<RocJpegImage> rocjpeg_images;
    RocJpegUtils rocjpeg_utils;
    std::vector<std::thread> threads;

    RocJpegUtils::ParseCommandLine(input_path, output_file_path, save_images, device_id, rocjpeg_backend, decode_params, &num_threads, nullptr, argc, argv);
    if (!RocJpegUtils::GetFilePaths(input_path, file_paths, is_dir, is_file)) {
        std::cerr << "ERROR: Failed to get input file paths!" << std::endl;
        return EXIT_FAILURE;
    }
    if (!RocJpegUtils::InitHipDevice(device_id)) {
        std::cerr << "ERROR: Failed to initialize HIP!" << std::endl;
        return EXIT_FAILURE;
    }

    if (num_threads > file_paths.size()) {
        num_threads = file_paths.size();
    }

    std::cout << "Creating decoder objects, please wait!" << std::endl;
    for (int i = 0; i < num_threads; i++) {
        RocJpegStreamHandle rocjpeg_stream;
        RocJpegHandle rocjpeg_handle;
        CHECK_ROCJPEG(rocJpegCreate(rocjpeg_backend, device_id, &rocjpeg_handle));
        rocjpeg_handles.push_back(std::move(rocjpeg_handle));
        CHECK_ROCJPEG(rocJpegStreamCreate(&rocjpeg_stream));
        rocjpeg_streams.push_back(std::move(rocjpeg_stream));
    }
    num_decoded_images_per_thread.resize(num_threads, 0);
    image_size_in_mpixels_per_thread.resize(num_threads, 0);
    rocjpeg_images.resize(num_threads, {0});

    std::cout << "Decoding started with " << num_threads << " threads, please wait!" << std::endl;
    auto start_time = std::chrono::high_resolution_clock::now();
    for (int i = 0; i < num_threads; ++i) {
        threads.emplace_back(ThreadFunction, std::ref(file_paths), rocjpeg_handles[i], rocjpeg_streams[i], rocjpeg_utils, &rocjpeg_images[i], std::ref(mutex), std::ref(decode_params), save_images, std::ref(output_file_path),
            &num_decoded_images_per_thread[i], &image_size_in_mpixels_per_thread[i]);
    }
    for (auto& thread : threads) {
        thread.join();
    }
    auto end_time = std::chrono::high_resolution_clock::now();
    auto total_time_in_milli_sec = std::chrono::duration<double, std::milli>(end_time - start_time).count();

    uint64_t total_decoded_images = 0;
    double total_image_size_in_mpixels = 0;
    for (auto i = 0 ; i < num_threads; i++) {
        total_decoded_images += num_decoded_images_per_thread[i];
        total_image_size_in_mpixels += image_size_in_mpixels_per_thread[i];
        for (int j = 0; j < ROCJPEG_MAX_COMPONENT; j++) {
            if (rocjpeg_images[i].channel[j] != nullptr) {
                CHECK_HIP(hipFree((void *)rocjpeg_images[i].channel[j]));
                rocjpeg_images[i].channel[j] = nullptr;
            }
        }
    }

    double average_decoding_time_in_milli_sec = total_time_in_milli_sec / total_decoded_images;
    double avg_images_per_sec = 1000 / average_decoding_time_in_milli_sec;
    double avg_image_size_in_mpixels_per_sec = total_image_size_in_mpixels * avg_images_per_sec / total_decoded_images;
    std::cout << "Total elapsed time (ms): " << total_time_in_milli_sec << std::endl;
    std::cout << "Total decoded images: " << total_decoded_images << std::endl;
    std::cout << "Average processing time per image (ms): " << average_decoding_time_in_milli_sec << std::endl;
    std::cout << "Average decoded images per sec (Images/Sec): " << avg_images_per_sec << std::endl;
    std::cout << "Average decoded images size (Mpixels/Sec): " << avg_image_size_in_mpixels_per_sec << std::endl;

    for (auto& handle : rocjpeg_handles) {
        CHECK_ROCJPEG(rocJpegDestroy(handle));
    }
    for (auto& rocjpecg_stream : rocjpeg_streams) {
        CHECK_ROCJPEG(rocJpegStreamDestroy(rocjpecg_stream));
    }
    std::cout << "Decoding completed!" << std::endl;
    return EXIT_SUCCESS;
}