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133 lines
4.6 KiB
Plaintext
133 lines
4.6 KiB
Plaintext
/* Copyright (c) 2022, NVIDIA CORPORATION. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of NVIDIA CORPORATION nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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**************************************************************************
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* \file dct8x8_kernel_quantization.cu
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* \brief Contains unoptimized quantization routines. Device code.
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*
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* This code implements CUDA versions of quantization of Discrete Cosine
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* Transform coefficients with 8x8 blocks for float and short arrays.
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*/
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#pragma once
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#include <cooperative_groups.h>
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namespace cg = cooperative_groups;
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#include "Common.h"
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/**
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* JPEG quality=0_of_12 quantization matrix
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*/
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__constant__ short Q[] = {
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32, 33, 51, 81, 66, 39, 34, 17,
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33, 36, 48, 47, 28, 23, 12, 12,
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51, 48, 47, 28, 23, 12, 12, 12,
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81, 47, 28, 23, 12, 12, 12, 12,
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66, 28, 23, 12, 12, 12, 12, 12,
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39, 23, 12, 12, 12, 12, 12, 12,
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34, 12, 12, 12, 12, 12, 12, 12,
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17, 12, 12, 12, 12, 12, 12, 12
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};
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/**
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**************************************************************************
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* Performs in-place quantization of given DCT coefficients plane using
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* predefined quantization matrices (for floats plane). Unoptimized.
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*
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* \param SrcDst [IN/OUT] - DCT coefficients plane
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* \param Stride [IN] - Stride of SrcDst
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*
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* \return None
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*/
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__global__ void CUDAkernelQuantizationFloat(float *SrcDst, int Stride) {
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// Block index
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int bx = blockIdx.x;
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int by = blockIdx.y;
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// Thread index (current coefficient)
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int tx = threadIdx.x;
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int ty = threadIdx.y;
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// copy current coefficient to the local variable
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float curCoef =
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SrcDst[(by * BLOCK_SIZE + ty) * Stride + (bx * BLOCK_SIZE + tx)];
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float curQuant = (float)Q[ty * BLOCK_SIZE + tx];
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// quantize the current coefficient
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float quantized = roundf(curCoef / curQuant);
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curCoef = quantized * curQuant;
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// copy quantized coefficient back to the DCT-plane
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SrcDst[(by * BLOCK_SIZE + ty) * Stride + (bx * BLOCK_SIZE + tx)] = curCoef;
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}
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/**
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**************************************************************************
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* Performs in-place quantization of given DCT coefficients plane using
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* predefined quantization matrices (for shorts plane). Unoptimized.
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*
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* \param SrcDst [IN/OUT] - DCT coefficients plane
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* \param Stride [IN] - Stride of SrcDst
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*
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* \return None
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*/
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__global__ void CUDAkernelQuantizationShort(short *SrcDst, int Stride) {
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// Handle to thread block group
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cg::thread_block cta = cg::this_thread_block();
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// Block index
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int bx = blockIdx.x;
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int by = blockIdx.y;
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// Thread index (current coefficient)
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int tx = threadIdx.x;
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int ty = threadIdx.y;
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// copy current coefficient to the local variable
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short curCoef =
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SrcDst[(by * BLOCK_SIZE + ty) * Stride + (bx * BLOCK_SIZE + tx)];
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short curQuant = Q[ty * BLOCK_SIZE + tx];
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// quantize the current coefficient
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if (curCoef < 0) {
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curCoef = -curCoef;
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curCoef += curQuant >> 1;
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curCoef /= curQuant;
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curCoef = -curCoef;
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} else {
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curCoef += curQuant >> 1;
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curCoef /= curQuant;
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}
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cg::sync(cta);
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curCoef = curCoef * curQuant;
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// copy quantized coefficient back to the DCT-plane
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SrcDst[(by * BLOCK_SIZE + ty) * Stride + (bx * BLOCK_SIZE + tx)] = curCoef;
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}
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