mirror of https://git.ffmpeg.org/ffmpeg.git
124 lines
5.4 KiB
Plaintext
124 lines
5.4 KiB
Plaintext
/*
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* Copyright (c) 2017, 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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#include "cuda/vector_helpers.cuh"
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template<typename T>
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__device__ inline void Subsample_Nearest(cudaTextureObject_t tex,
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T *dst,
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int dst_width, int dst_height, int dst_pitch,
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int src_width, int src_height,
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int bit_depth)
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{
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int xo = blockIdx.x * blockDim.x + threadIdx.x;
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int yo = blockIdx.y * blockDim.y + threadIdx.y;
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if (yo < dst_height && xo < dst_width)
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{
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float hscale = (float)src_width / (float)dst_width;
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float vscale = (float)src_height / (float)dst_height;
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float xi = (xo + 0.5f) * hscale;
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float yi = (yo + 0.5f) * vscale;
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dst[yo*dst_pitch+xo] = tex2D<T>(tex, xi, yi);
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}
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}
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template<typename T>
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__device__ inline void Subsample_Bilinear(cudaTextureObject_t tex,
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T *dst,
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int dst_width, int dst_height, int dst_pitch,
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int src_width, int src_height,
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int bit_depth)
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{
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int xo = blockIdx.x * blockDim.x + threadIdx.x;
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int yo = blockIdx.y * blockDim.y + threadIdx.y;
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if (yo < dst_height && xo < dst_width)
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{
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float hscale = (float)src_width / (float)dst_width;
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float vscale = (float)src_height / (float)dst_height;
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float xi = (xo + 0.5f) * hscale;
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float yi = (yo + 0.5f) * vscale;
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// 3-tap filter weights are {wh,1.0,wh} and {wv,1.0,wv}
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float wh = min(max(0.5f * (hscale - 1.0f), 0.0f), 1.0f);
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float wv = min(max(0.5f * (vscale - 1.0f), 0.0f), 1.0f);
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// Convert weights to two bilinear weights -> {wh,1.0,wh} -> {wh,0.5,0} + {0,0.5,wh}
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float dx = wh / (0.5f + wh);
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float dy = wv / (0.5f + wv);
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intT r = { 0 };
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vec_set_scalar(r, 2);
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r += tex2D<T>(tex, xi - dx, yi - dy);
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r += tex2D<T>(tex, xi + dx, yi - dy);
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r += tex2D<T>(tex, xi - dx, yi + dy);
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r += tex2D<T>(tex, xi + dx, yi + dy);
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vec_set(dst[yo*dst_pitch+xo], r >> 2);
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}
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}
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extern "C" {
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#define NEAREST_KERNEL(T) \
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__global__ void Subsample_Nearest_ ## T(cudaTextureObject_t src_tex, \
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T *dst, \
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int dst_width, int dst_height, int dst_pitch, \
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int src_width, int src_height, \
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int bit_depth) \
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{ \
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Subsample_Nearest<T>(src_tex, dst, \
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dst_width, dst_height, dst_pitch, \
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src_width, src_height, \
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bit_depth); \
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}
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NEAREST_KERNEL(uchar)
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NEAREST_KERNEL(uchar2)
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NEAREST_KERNEL(uchar4)
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NEAREST_KERNEL(ushort)
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NEAREST_KERNEL(ushort2)
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NEAREST_KERNEL(ushort4)
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#define BILINEAR_KERNEL(T) \
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__global__ void Subsample_Bilinear_ ## T(cudaTextureObject_t src_tex, \
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T *dst, \
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int dst_width, int dst_height, int dst_pitch, \
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int src_width, int src_height, \
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int bit_depth) \
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{ \
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Subsample_Bilinear<T>(src_tex, dst, \
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dst_width, dst_height, dst_pitch, \
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src_width, src_height, \
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bit_depth); \
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}
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BILINEAR_KERNEL(uchar)
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BILINEAR_KERNEL(uchar2)
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BILINEAR_KERNEL(uchar4)
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BILINEAR_KERNEL(ushort)
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BILINEAR_KERNEL(ushort2)
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BILINEAR_KERNEL(ushort4)
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}
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