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