| /* |
| * Copyright (c) 2022, NVIDIA CORPORATION. All rights reserved. |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a |
| * copy of this software and associated documentation files (the "Software"), |
| * to deal in the Software without restriction, including without limitation |
| * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| * and/or sell copies of the Software, and to permit persons to whom the |
| * Software is furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included in |
| * all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
| * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
| * DEALINGS IN THE SOFTWARE. |
| */ |
| |
| extern "C" { |
| #define MPEG_LUMA_MIN (16) |
| #define MPEG_CHROMA_MIN (16) |
| #define MPEG_LUMA_MAX (235) |
| #define MPEG_CHROMA_MAX (240) |
| |
| #define JPEG_LUMA_MIN (0) |
| #define JPEG_CHROMA_MIN (1) |
| #define JPEG_LUMA_MAX (255) |
| #define JPEG_CHROMA_MAX (255) |
| |
| __device__ int mpeg_min[] = {MPEG_LUMA_MIN, MPEG_CHROMA_MIN}; |
| __device__ int mpeg_max[] = {MPEG_LUMA_MAX, MPEG_CHROMA_MAX}; |
| |
| __device__ int jpeg_min[] = {JPEG_LUMA_MIN, JPEG_CHROMA_MIN}; |
| __device__ int jpeg_max[] = {JPEG_LUMA_MAX, JPEG_CHROMA_MAX}; |
| |
| __device__ int clamp(int val, int min, int max) |
| { |
| if (val < min) |
| return min; |
| else if (val > max) |
| return max; |
| else |
| return val; |
| } |
| |
| __global__ void to_jpeg_cuda(const unsigned char* src, unsigned char* dst, |
| int pitch, int comp_id) |
| { |
| int x = blockIdx.x * blockDim.x + threadIdx.x; |
| int y = blockIdx.y * blockDim.y + threadIdx.y; |
| int src_, dst_; |
| |
| // 8 bit -> 15 bit for better precision |
| src_ = static_cast<int>(src[x + y * pitch]) << 7; |
| |
| // Conversion |
| dst_ = comp_id ? (min(src_, 30775) * 4663 - 9289992) >> 12 // chroma |
| : (min(src_, 30189) * 19077 - 39057361) >> 14; // luma |
| |
| // Dither replacement |
| dst_ = dst_ + 64; |
| |
| // Back to 8 bit |
| dst_ = clamp(dst_ >> 7, jpeg_min[comp_id], jpeg_max[comp_id]); |
| dst[x + y * pitch] = static_cast<unsigned char>(dst_); |
| } |
| |
| __global__ void to_mpeg_cuda(const unsigned char* src, unsigned char* dst, |
| int pitch, int comp_id) |
| { |
| int x = blockIdx.x * blockDim.x + threadIdx.x; |
| int y = blockIdx.y * blockDim.y + threadIdx.y; |
| int src_, dst_; |
| |
| // 8 bit -> 15 bit for better precision |
| src_ = static_cast<int>(src[x + y * pitch]) << 7; |
| |
| // Conversion |
| dst_ = comp_id ? (src_ * 1799 + 4081085) >> 11 // chroma |
| : (src_ * 14071 + 33561947) >> 14; // luma |
| |
| // Dither replacement |
| dst_ = dst_ + 64; |
| |
| // Back to 8 bit |
| dst_ = clamp(dst_ >> 7, mpeg_min[comp_id], mpeg_max[comp_id]); |
| dst[x + y * pitch] = static_cast<unsigned char>(dst_); |
| } |
| |
| } |