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https://github.com/xenia-project/FFmpeg.git
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ca32f7f208
It was an ugly hack to begin with and didn't give any performance. NOTE: this patch opens up some future simplifications to be made (such as removing some of the scantables from H264Context) but doesn't take advantage of them yet. Originally committed as revision 26329 to svn://svn.ffmpeg.org/ffmpeg/trunk
219 lines
8.0 KiB
C
219 lines
8.0 KiB
C
/*
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* H.264 IDCT
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* Copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* H.264 IDCT.
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* @author Michael Niedermayer <michaelni@gmx.at>
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*/
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#include "dsputil.h"
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static av_always_inline void idct_internal(uint8_t *dst, DCTELEM *block, int stride, int block_stride, int shift, int add){
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int i;
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uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
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block[0] += 1<<(shift-1);
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for(i=0; i<4; i++){
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const int z0= block[i + block_stride*0] + block[i + block_stride*2];
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const int z1= block[i + block_stride*0] - block[i + block_stride*2];
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const int z2= (block[i + block_stride*1]>>1) - block[i + block_stride*3];
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const int z3= block[i + block_stride*1] + (block[i + block_stride*3]>>1);
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block[i + block_stride*0]= z0 + z3;
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block[i + block_stride*1]= z1 + z2;
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block[i + block_stride*2]= z1 - z2;
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block[i + block_stride*3]= z0 - z3;
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}
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for(i=0; i<4; i++){
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const int z0= block[0 + block_stride*i] + block[2 + block_stride*i];
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const int z1= block[0 + block_stride*i] - block[2 + block_stride*i];
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const int z2= (block[1 + block_stride*i]>>1) - block[3 + block_stride*i];
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const int z3= block[1 + block_stride*i] + (block[3 + block_stride*i]>>1);
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dst[i + 0*stride]= cm[ add*dst[i + 0*stride] + ((z0 + z3) >> shift) ];
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dst[i + 1*stride]= cm[ add*dst[i + 1*stride] + ((z1 + z2) >> shift) ];
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dst[i + 2*stride]= cm[ add*dst[i + 2*stride] + ((z1 - z2) >> shift) ];
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dst[i + 3*stride]= cm[ add*dst[i + 3*stride] + ((z0 - z3) >> shift) ];
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}
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}
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void ff_h264_idct_add_c(uint8_t *dst, DCTELEM *block, int stride){
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idct_internal(dst, block, stride, 4, 6, 1);
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}
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void ff_h264_lowres_idct_add_c(uint8_t *dst, int stride, DCTELEM *block){
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idct_internal(dst, block, stride, 8, 3, 1);
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}
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void ff_h264_lowres_idct_put_c(uint8_t *dst, int stride, DCTELEM *block){
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idct_internal(dst, block, stride, 8, 3, 0);
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}
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void ff_h264_idct8_add_c(uint8_t *dst, DCTELEM *block, int stride){
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int i;
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uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
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block[0] += 32;
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for( i = 0; i < 8; i++ )
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{
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const int a0 = block[i+0*8] + block[i+4*8];
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const int a2 = block[i+0*8] - block[i+4*8];
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const int a4 = (block[i+2*8]>>1) - block[i+6*8];
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const int a6 = (block[i+6*8]>>1) + block[i+2*8];
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const int b0 = a0 + a6;
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const int b2 = a2 + a4;
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const int b4 = a2 - a4;
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const int b6 = a0 - a6;
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const int a1 = -block[i+3*8] + block[i+5*8] - block[i+7*8] - (block[i+7*8]>>1);
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const int a3 = block[i+1*8] + block[i+7*8] - block[i+3*8] - (block[i+3*8]>>1);
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const int a5 = -block[i+1*8] + block[i+7*8] + block[i+5*8] + (block[i+5*8]>>1);
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const int a7 = block[i+3*8] + block[i+5*8] + block[i+1*8] + (block[i+1*8]>>1);
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const int b1 = (a7>>2) + a1;
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const int b3 = a3 + (a5>>2);
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const int b5 = (a3>>2) - a5;
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const int b7 = a7 - (a1>>2);
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block[i+0*8] = b0 + b7;
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block[i+7*8] = b0 - b7;
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block[i+1*8] = b2 + b5;
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block[i+6*8] = b2 - b5;
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block[i+2*8] = b4 + b3;
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block[i+5*8] = b4 - b3;
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block[i+3*8] = b6 + b1;
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block[i+4*8] = b6 - b1;
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}
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for( i = 0; i < 8; i++ )
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{
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const int a0 = block[0+i*8] + block[4+i*8];
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const int a2 = block[0+i*8] - block[4+i*8];
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const int a4 = (block[2+i*8]>>1) - block[6+i*8];
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const int a6 = (block[6+i*8]>>1) + block[2+i*8];
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const int b0 = a0 + a6;
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const int b2 = a2 + a4;
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const int b4 = a2 - a4;
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const int b6 = a0 - a6;
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const int a1 = -block[3+i*8] + block[5+i*8] - block[7+i*8] - (block[7+i*8]>>1);
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const int a3 = block[1+i*8] + block[7+i*8] - block[3+i*8] - (block[3+i*8]>>1);
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const int a5 = -block[1+i*8] + block[7+i*8] + block[5+i*8] + (block[5+i*8]>>1);
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const int a7 = block[3+i*8] + block[5+i*8] + block[1+i*8] + (block[1+i*8]>>1);
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const int b1 = (a7>>2) + a1;
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const int b3 = a3 + (a5>>2);
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const int b5 = (a3>>2) - a5;
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const int b7 = a7 - (a1>>2);
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dst[i + 0*stride] = cm[ dst[i + 0*stride] + ((b0 + b7) >> 6) ];
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dst[i + 1*stride] = cm[ dst[i + 1*stride] + ((b2 + b5) >> 6) ];
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dst[i + 2*stride] = cm[ dst[i + 2*stride] + ((b4 + b3) >> 6) ];
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dst[i + 3*stride] = cm[ dst[i + 3*stride] + ((b6 + b1) >> 6) ];
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dst[i + 4*stride] = cm[ dst[i + 4*stride] + ((b6 - b1) >> 6) ];
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dst[i + 5*stride] = cm[ dst[i + 5*stride] + ((b4 - b3) >> 6) ];
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dst[i + 6*stride] = cm[ dst[i + 6*stride] + ((b2 - b5) >> 6) ];
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dst[i + 7*stride] = cm[ dst[i + 7*stride] + ((b0 - b7) >> 6) ];
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}
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}
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// assumes all AC coefs are 0
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void ff_h264_idct_dc_add_c(uint8_t *dst, DCTELEM *block, int stride){
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int i, j;
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int dc = (block[0] + 32) >> 6;
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uint8_t *cm = ff_cropTbl + MAX_NEG_CROP + dc;
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for( j = 0; j < 4; j++ )
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{
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for( i = 0; i < 4; i++ )
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dst[i] = cm[ dst[i] ];
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dst += stride;
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}
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}
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void ff_h264_idct8_dc_add_c(uint8_t *dst, DCTELEM *block, int stride){
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int i, j;
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int dc = (block[0] + 32) >> 6;
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uint8_t *cm = ff_cropTbl + MAX_NEG_CROP + dc;
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for( j = 0; j < 8; j++ )
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{
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for( i = 0; i < 8; i++ )
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dst[i] = cm[ dst[i] ];
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dst += stride;
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}
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}
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//FIXME this table is a duplicate from h264data.h, and will be removed once the tables from, h264 have been split
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static const uint8_t scan8[16 + 2*4]={
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4+1*8, 5+1*8, 4+2*8, 5+2*8,
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6+1*8, 7+1*8, 6+2*8, 7+2*8,
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4+3*8, 5+3*8, 4+4*8, 5+4*8,
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6+3*8, 7+3*8, 6+4*8, 7+4*8,
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1+1*8, 2+1*8,
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1+2*8, 2+2*8,
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1+4*8, 2+4*8,
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1+5*8, 2+5*8,
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};
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void ff_h264_idct_add16_c(uint8_t *dst, const int *block_offset, DCTELEM *block, int stride, const uint8_t nnzc[6*8]){
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int i;
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for(i=0; i<16; i++){
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int nnz = nnzc[ scan8[i] ];
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if(nnz){
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if(nnz==1 && block[i*16]) ff_h264_idct_dc_add_c(dst + block_offset[i], block + i*16, stride);
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else idct_internal (dst + block_offset[i], block + i*16, stride, 4, 6, 1);
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}
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}
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}
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void ff_h264_idct_add16intra_c(uint8_t *dst, const int *block_offset, DCTELEM *block, int stride, const uint8_t nnzc[6*8]){
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int i;
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for(i=0; i<16; i++){
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if(nnzc[ scan8[i] ]) idct_internal (dst + block_offset[i], block + i*16, stride, 4, 6, 1);
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else if(block[i*16]) ff_h264_idct_dc_add_c(dst + block_offset[i], block + i*16, stride);
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}
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}
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void ff_h264_idct8_add4_c(uint8_t *dst, const int *block_offset, DCTELEM *block, int stride, const uint8_t nnzc[6*8]){
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int i;
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for(i=0; i<16; i+=4){
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int nnz = nnzc[ scan8[i] ];
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if(nnz){
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if(nnz==1 && block[i*16]) ff_h264_idct8_dc_add_c(dst + block_offset[i], block + i*16, stride);
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else ff_h264_idct8_add_c (dst + block_offset[i], block + i*16, stride);
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}
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}
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}
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void ff_h264_idct_add8_c(uint8_t **dest, const int *block_offset, DCTELEM *block, int stride, const uint8_t nnzc[6*8]){
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int i;
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for(i=16; i<16+8; i++){
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if(nnzc[ scan8[i] ])
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ff_h264_idct_add_c (dest[(i&4)>>2] + block_offset[i], block + i*16, stride);
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else if(block[i*16])
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ff_h264_idct_dc_add_c(dest[(i&4)>>2] + block_offset[i], block + i*16, stride);
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}
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}
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