rocm-systems/utils/resize_kernels.cpp

/*
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*/

#include "resize_kernels.h"
#include "roc_video_dec.h"

/**
 * @brief low level HIP kernel for Resize using nearest neighbor interpolation
 * 
 * @tparam YuvUnitx2 
 * @param p_src    - src Y pointer
 * @param p_src_uv  - src UV pointer
 * @param src_pitch - src pitch
 * @param p_dst     - dst Y pointer
 * @param p_dst_uv  - dst UV pointer
 * @param pitch     - dst pitch
 * @param width     - dst width
 * @param height    - dst height
 * @param fx_scale  - xscale
 * @param fy_scale  - yscale
 * @return 
 */

template<typename YuvUnitx2>
static __global__ void ResizeHip(uint8_t *p_src, uint8_t *p_src_uv, int src_pitch,
                        uint8_t *p_dst, uint8_t *p_dst_uv, int pitch, int width, int height, float fx_scale, float fy_scale) {

    int ix = blockIdx.x * blockDim.x + threadIdx.x,
        iy = blockIdx.y * blockDim.y + threadIdx.y;

    if (ix >= width / 2 || iy >= height / 2) {
        return;
    }

    int x = ix * 2, y = iy * 2;
    typedef decltype(YuvUnitx2::x) YuvUnit;
    uint8_t *p_src_y = p_src + src_pitch * static_cast<uint32_t>(fmaf(y, fy_scale, 0.5 * fy_scale));
    *(YuvUnitx2 *)(p_dst + y * pitch + x * sizeof(YuvUnit)) = YuvUnitx2 {
        *(YuvUnit *)(p_src_y + static_cast<uint>(fmaf(x, fx_scale, 0.5 * fx_scale)) * sizeof(YuvUnit)),
        *(YuvUnit *)(p_src_y + static_cast<uint>(fmaf(x + 1, fx_scale, 0.5 * fx_scale) * sizeof(YuvUnit)))
    };
    y++;
    p_src_y = p_src + src_pitch * static_cast<uint32_t>(fmaf(y, fy_scale, 0.5 * fy_scale));
    *(YuvUnitx2 *)(p_dst + y * pitch + x * sizeof(YuvUnit)) = YuvUnitx2 {
        *(YuvUnit *)(p_src_y + static_cast<uint>(fmaf(x, fx_scale, 0.5 * fx_scale)) * sizeof(YuvUnit)),
        *(YuvUnit *)(p_src_y + static_cast<uint>(fmaf(x + 1, fx_scale, 0.5 * fx_scale)) * sizeof(YuvUnit))
    };
    YuvUnit *p_uv = (YuvUnit *) (p_src_uv + static_cast<uint>(fmaf(ix, fx_scale, fx_scale * 0.5)) * sizeof(YuvUnit) * 2 + 
                            src_pitch * static_cast<uint>(fmaf(iy, fy_scale, 0.5 * fy_scale)));
    *(YuvUnitx2 *)(p_dst_uv + iy * pitch + ix * 2 * sizeof(YuvUnit)) = YuvUnitx2{ (YuvUnit)p_uv[0], (YuvUnit)p_uv[1] };
}


template <typename YuvUnitx2>
static void Resize(unsigned char *p_dst, unsigned char* p_dst_uv, int dst_pitch, int dst_width, int dst_height, 
                    unsigned char *p_src, unsigned char *p_src_uv, int src_pitch, int src_width, int src_height, hipStream_t hip_stream) {                        
    ResizeHip<YuvUnitx2> <<<dim3((dst_width + 31) / 32, (dst_height + 31) / 32), dim3(16, 16), 0, hip_stream >>>(p_src, p_src_uv, src_pitch, p_dst, p_dst_uv,
        dst_pitch, dst_width, dst_height, 1.0f * src_width / dst_width, 1.0f * src_height / dst_height);
}

void ResizeNv12(unsigned char *p_dst_nv12, int dst_pitch, int dst_width, int dst_height, unsigned char *p_src_nv12, 
                int src_pitch, int src_width, int src_height, unsigned char* p_src_nv12_uv, unsigned char* p_dst_nv12_uv, hipStream_t hip_stream)
{
    unsigned char* p_src_uv = p_src_nv12_uv ? p_src_nv12_uv : p_src_nv12 + (src_pitch*src_height);
    unsigned char* p_dst_uv = p_dst_nv12_uv ? p_dst_nv12_uv : p_dst_nv12 + (dst_pitch*dst_height);
    return Resize<uchar2>(p_dst_nv12, p_dst_uv, dst_pitch, dst_width, dst_height, p_src_nv12, p_src_uv, src_pitch, src_width, src_height, hip_stream);
}


void ResizeP016(unsigned char *p_dst_p016, int dst_pitch, int dst_width, int dst_height, unsigned char *p_src_p016,
               int src_pitch, int src_width, int src_height, unsigned char* p_src_p016_uv, unsigned char* p_dst_p016_uv, hipStream_t hip_stream)
{
    unsigned char* p_src_uv = p_src_p016_uv ? p_src_p016_uv : p_src_p016 + (src_pitch*src_height);
    unsigned char* p_dst_uv = p_dst_p016_uv ? p_dst_p016_uv : p_dst_p016 + (dst_pitch*dst_height);
    return Resize<ushort2>(p_dst_p016, p_dst_uv, dst_pitch, dst_width, dst_height, p_src_p016, p_src_uv, src_pitch, src_width, src_height, hip_stream);
}

static __global__ void Scale(uint8_t *p_src, int src_pitch, uint8_t *p_dst, int pitch, int width, 
                            int height, float fx_scale, float fy_scale) {
    int x = blockIdx.x * blockDim.x + threadIdx.x,
        y = blockIdx.y * blockDim.y + threadIdx.y;

    if (x >= width || y >= height){
        return;
    }

    // do nearest neighbor interpolation
    uint8_t *p_src_xy = p_src + src_pitch * static_cast<uint>(fmaf(y, fy_scale, 0.5 * fy_scale)) + static_cast<uint>(fmaf(x, fx_scale, 0.5*fx_scale));
    *(uint8_t*)(p_dst + (y * pitch) + x) = *p_src_xy;
}

static __global__ void Scale_UV(uint8_t *p_src, int src_pitch, uint8_t *p_dst, int pitch, int width,
                                int height, float fx_scale, float fy_scale) {
    int x = blockIdx.x * blockDim.x + threadIdx.x,
        y = blockIdx.y * blockDim.y + threadIdx.y;

    if (x >= width || y >= height) {
        return;
    }
    // do nearest neighbor interpolation
    uint8_t *p_src_uv = p_src + src_pitch * static_cast<uint>(fmaf(y , fy_scale, 0.5 * fy_scale)) + static_cast<uint>(fmaf(x, fx_scale, 0.5 * fx_scale)) * 2;
    uchar2 dst_uv = uchar2{ p_src_uv[0], p_src_uv[1] };
    *(uchar2*)(p_dst + (y * pitch) + 2 * x) = dst_uv;
}

/**
 * @brief Resize a single plane of Y/U/V or UV interleaved (reserved for future)
 * 
 * @param dp_dst    - dest pointer
 * @param dst_pitch - Pitch of the dst plane
 * @param dst_width - Width of the dst plane
 * @param dst_height - Height of the dst plane
 * @param dp_src     - source pointer
 * @param src_pitch  - source pitch
 * @param src_width  - source width
 * @param src_height - source height
 * @param b_resize_uv - to resize UV plance or not
 * @param hip_stream    - Stream for launching the kernel   
 */
void ResizeYUVHipLaunchKernel(uint8_t *dp_dst, int dst_pitch, int dst_width, int dst_height, uint8_t *dp_src, int src_pitch, 
                                    int src_width, int src_height, bool b_resize_uv, hipStream_t hip_stream) {

    dim3 blockSize(16, 16, 1);
    dim3 gridSize(((uint32_t)dst_width + blockSize.x - 1) / blockSize.x, ((uint32_t)dst_height + blockSize.y - 1) / blockSize.y, 1);

    if (b_resize_uv) {
        Scale_UV <<<gridSize, blockSize, 0, hip_stream >>>(dp_src, src_pitch, dp_dst,
            dst_pitch, dst_width, dst_height, 1.0f * src_width / dst_width, 1.0f * src_height / dst_height);
    }
    else {
        Scale <<<gridSize, blockSize, 0, hip_stream >>>(dp_src, src_pitch, dp_dst,
            dst_pitch, dst_width, dst_height, 1.0f * src_width / dst_width, 1.0f * src_height / dst_height);
    }
}

void ResizeYUV420(uint8_t *p_dst_y,
                uint8_t* p_dst_u,
                uint8_t* p_dst_v,
                int dst_pitch_y,
                int dst_pitch_uv,
                int dst_width,
                int dst_height,
                uint8_t *p_src_y,
                uint8_t* p_src_u,
                uint8_t* p_src_v,
                int src_pitch_y,
                int src_pitch_uv,
                int src_width,
                int src_height,
                bool b_nv12,
                hipStream_t hip_stream) {

    int uv_width_dst = (dst_width + 1) >> 1;
    int uv_height_dst = (dst_width + 1) >> 1;
    int uv_width_src = (src_width + 1) >> 1;
    int uv_height_src = (src_height + 1) >> 1;

    // Scale Y plane
    ResizeYUVHipLaunchKernel(p_dst_y, dst_pitch_y, dst_width, dst_height, p_src_y, src_pitch_y, src_width, src_height, 0, hip_stream);
    if (b_nv12) {
        ResizeYUVHipLaunchKernel(p_dst_u, dst_pitch_uv, uv_width_dst, uv_height_dst, p_src_u, src_pitch_uv, uv_width_src, uv_height_src, b_nv12, hip_stream);
    } else {
        ResizeYUVHipLaunchKernel(p_dst_u, dst_pitch_uv, uv_width_dst, uv_height_dst, p_src_u, src_pitch_uv, uv_width_src, uv_height_src, b_nv12, hip_stream);
        ResizeYUVHipLaunchKernel(p_dst_v, dst_pitch_uv, uv_width_dst, uv_height_dst, p_src_v, src_pitch_uv, uv_width_src, uv_height_src, b_nv12, hip_stream);
    }
}