NVIDIA CUDA 硬编码代码

好的，以下是一个简单的 NVIDIA CUDA 硬编码代码示例：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <cuda.h>
#include <cuda_runtime.h>
#include <nvcuvid.h>
#include <nvcuviddec.h>

#define CUDA_CHECK(call) \
do { \
    CUresult status = call; \
    if (status != CUDA_SUCCESS) { \
        const char* err_msg; \
        cuGetErrorString(status, &err_msg); \
        fprintf(stderr, "CUDA error: %s\n", err_msg); \
        exit(EXIT_FAILURE); \
    } \
} while (0)

#define NVDEC_CHECK(call) \
do { \
    NVDECSTATUS status = call; \
    if (status != NVDEC_SUCCESS) { \
        fprintf(stderr, "NVDEC error: %d\n", status); \
        exit(EXIT_FAILURE); \
    } \
} while (0)

int main(int argc, char** argv)
{
    CUdevice cu_device;
    CUcontext cu_ctx;
    CUvideoctxlock cu_lock;
    CUvideoparser cu_parser;
    CUvideodecoder cu_decoder;
    CUstream cu_stream;
    CUdeviceptr cu_frame;
    uint8_t* yuv_frame;
    uint32_t frame_width, frame_height, frame_size;
    uint32_t decoded_frames = 0;

    // Initialize CUDA
    CUDA_CHECK(cuInit(0));
    CUDA_CHECK(cuDeviceGet(&cu_device, 0));
    CUDA_CHECK(cuCtxCreate(&cu_ctx, 0, cu_device));
    CUDA_CHECK(cuvidCtxLockCreate(&cu_lock, cu_ctx));

    // Initialize decoder
    NVDEC_CHECK(cuvidCreateVideoParser(&cu_parser, &nvcuvid_parser_params));
    NVDEC_CHECK(cuvidCreateDecoder(&cu_decoder, &nvcuvid_dec_params));

    // Initialize YUV frame buffer
    frame_width = nvcuvid_dec_params.ulMaxWidth;
    frame_height = nvcuvid_dec_params.ulMaxHeight;
    frame_size = frame_width * frame_height * 3 / 2;
    yuv_frame = (uint8_t*) malloc(frame_size);
    CUDA_CHECK(cuMemAlloc(&cu_frame, frame_size));

    // Initialize CUDA stream
    CUDA_CHECK(cuStreamCreate(&cu_stream, 0));

    // Loop over input frames
    while (/* more input frames */) {
        // Parse input frame
        NVDEC_CHECK(cuvidParseVideoData(cu_parser, input_frame_data, input_frame_size, 0));

        // Decode frame
        CUVIDPICPARAMS pic_params = {0};
        pic_params.CurrPicIdx = decoded_frames;
        pic_params.ulTargetWidth = frame_width;
        pic_params.ulTargetHeight = frame_height;
        CUVIDPROCPARAMS proc_params = {0};
        proc_params.progressive_frame = 1;
        proc_params.second_field = 0;
        proc_params.top_field_first = 1;
        proc_params.unpaired_field = 1;
        CUVIDGETDECODESTATUS status = {0};
        NVDEC_CHECK(cuvidDecodePicture(cu_decoder, &pic_params));
        NVDEC_CHECK(cuvidMapVideoFrame(cu_decoder, decoded_frames, &cu_frame, &frame_size, &proc_params));
        NVDEC_CHECK(cuvidCtxLock(cu_lock, 0));
        CUDA_CHECK(cuMemcpyDtoH(yuv_frame, cu_frame, frame_size));
        NVDEC_CHECK(cuvidUnmapVideoFrame(cu_decoder, cu_frame));
        NVDEC_CHECK(cuvidGetDecodeStatus(cu_decoder, decoded_frames, &status));
        NVDEC_CHECK(cuvidCtxUnlock(cu_lock, 0));

        // Process YUV frame
        /* ... */
        
        // Increment decoded frame count
        decoded_frames++;
    }

    // Clean up
    CUDA_CHECK(cuStreamSynchronize(cu_stream));
    CUDA_CHECK(cuStreamDestroy(cu_stream));
    CUDA_CHECK(cuMemFree(cu_frame));
    free(yuv_frame);
    NVDEC_CHECK(cuvidDestroyDecoder(cu_decoder));
    NVDEC_CHECK(cuvidDestroyVideoParser(cu_parser));
    cuvidCtxLockDestroy(cu_lock);
    CUDA_CHECK(cuCtxDestroy(cu_ctx));
    
    return 0;
}

注意，这只是一个简单的示例，实际使用中需要根据具体需求进行修改和优化。