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Use of these has been broken ever since the h264 idct was changed to always use transposed inputs. Furthermore, they were only ever used if some *other* non-default idct was requested. Signed-off-by: Mans Rullgard <mans@mansr.com>
287 lines
10 KiB
C
287 lines
10 KiB
C
/*
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* H.264 IDCT
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* Copyright (c) 2004-2011 Michael Niedermayer <michaelni@gmx.at>
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*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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 "bit_depth_template.c"
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#ifndef AVCODEC_H264IDCT_INTERNAL_H
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#define AVCODEC_H264IDCT_INTERNAL_H
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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*3]={
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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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4+ 6*8, 5+ 6*8, 4+ 7*8, 5+ 7*8,
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6+ 6*8, 7+ 6*8, 6+ 7*8, 7+ 7*8,
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4+ 8*8, 5+ 8*8, 4+ 9*8, 5+ 9*8,
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6+ 8*8, 7+ 8*8, 6+ 9*8, 7+ 9*8,
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4+11*8, 5+11*8, 4+12*8, 5+12*8,
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6+11*8, 7+11*8, 6+12*8, 7+12*8,
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4+13*8, 5+13*8, 4+14*8, 5+14*8,
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6+13*8, 7+13*8, 6+14*8, 7+14*8
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};
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#endif
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void FUNCC(ff_h264_idct_add)(uint8_t *_dst, DCTELEM *_block, int stride)
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{
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int i;
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INIT_CLIP
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pixel *dst = (pixel*)_dst;
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dctcoef *block = (dctcoef*)_block;
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stride /= sizeof(pixel);
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block[0] += 1 << 5;
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for(i=0; i<4; i++){
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const int z0= block[i + 4*0] + block[i + 4*2];
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const int z1= block[i + 4*0] - block[i + 4*2];
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const int z2= (block[i + 4*1]>>1) - block[i + 4*3];
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const int z3= block[i + 4*1] + (block[i + 4*3]>>1);
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block[i + 4*0]= z0 + z3;
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block[i + 4*1]= z1 + z2;
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block[i + 4*2]= z1 - z2;
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block[i + 4*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 + 4*i] + block[2 + 4*i];
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const int z1= block[0 + 4*i] - block[2 + 4*i];
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const int z2= (block[1 + 4*i]>>1) - block[3 + 4*i];
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const int z3= block[1 + 4*i] + (block[3 + 4*i]>>1);
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dst[i + 0*stride]= CLIP(dst[i + 0*stride] + ((z0 + z3) >> 6));
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dst[i + 1*stride]= CLIP(dst[i + 1*stride] + ((z1 + z2) >> 6));
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dst[i + 2*stride]= CLIP(dst[i + 2*stride] + ((z1 - z2) >> 6));
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dst[i + 3*stride]= CLIP(dst[i + 3*stride] + ((z0 - z3) >> 6));
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}
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}
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void FUNCC(ff_h264_idct8_add)(uint8_t *_dst, DCTELEM *_block, int stride){
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int i;
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INIT_CLIP
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pixel *dst = (pixel*)_dst;
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dctcoef *block = (dctcoef*)_block;
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stride /= sizeof(pixel);
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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] = CLIP( dst[i + 0*stride] + ((b0 + b7) >> 6) );
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dst[i + 1*stride] = CLIP( dst[i + 1*stride] + ((b2 + b5) >> 6) );
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dst[i + 2*stride] = CLIP( dst[i + 2*stride] + ((b4 + b3) >> 6) );
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dst[i + 3*stride] = CLIP( dst[i + 3*stride] + ((b6 + b1) >> 6) );
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dst[i + 4*stride] = CLIP( dst[i + 4*stride] + ((b6 - b1) >> 6) );
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dst[i + 5*stride] = CLIP( dst[i + 5*stride] + ((b4 - b3) >> 6) );
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dst[i + 6*stride] = CLIP( dst[i + 6*stride] + ((b2 - b5) >> 6) );
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dst[i + 7*stride] = CLIP( 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 FUNCC(ff_h264_idct_dc_add)(uint8_t *_dst, DCTELEM *block, int stride){
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int i, j;
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int dc = (((dctcoef*)block)[0] + 32) >> 6;
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INIT_CLIP
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pixel *dst = (pixel*)_dst;
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stride /= sizeof(pixel);
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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] = CLIP( dst[i] + dc );
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dst += stride;
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}
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}
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void FUNCC(ff_h264_idct8_dc_add)(uint8_t *_dst, DCTELEM *block, int stride){
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int i, j;
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int dc = (((dctcoef*)block)[0] + 32) >> 6;
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INIT_CLIP
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pixel *dst = (pixel*)_dst;
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stride /= sizeof(pixel);
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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] = CLIP( dst[i] + dc );
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dst += stride;
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}
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}
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void FUNCC(ff_h264_idct_add16)(uint8_t *dst, const int *block_offset, DCTELEM *block, int stride, const uint8_t nnzc[15*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 && ((dctcoef*)block)[i*16]) FUNCC(ff_h264_idct_dc_add)(dst + block_offset[i], block + i*16*sizeof(pixel), stride);
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else FUNCC(ff_h264_idct_add )(dst + block_offset[i], block + i*16*sizeof(pixel), stride);
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}
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}
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}
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void FUNCC(ff_h264_idct_add16intra)(uint8_t *dst, const int *block_offset, DCTELEM *block, int stride, const uint8_t nnzc[15*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] ]) FUNCC(ff_h264_idct_add )(dst + block_offset[i], block + i*16*sizeof(pixel), stride);
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else if(((dctcoef*)block)[i*16]) FUNCC(ff_h264_idct_dc_add)(dst + block_offset[i], block + i*16*sizeof(pixel), stride);
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}
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}
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void FUNCC(ff_h264_idct8_add4)(uint8_t *dst, const int *block_offset, DCTELEM *block, int stride, const uint8_t nnzc[15*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 && ((dctcoef*)block)[i*16]) FUNCC(ff_h264_idct8_dc_add)(dst + block_offset[i], block + i*16*sizeof(pixel), stride);
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else FUNCC(ff_h264_idct8_add )(dst + block_offset[i], block + i*16*sizeof(pixel), stride);
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}
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}
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}
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void FUNCC(ff_h264_idct_add8)(uint8_t **dest, const int *block_offset, DCTELEM *block, int stride, const uint8_t nnzc[15*8]){
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int i, j;
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for(j=1; j<3; j++){
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for(i=j*16; i<j*16+4; i++){
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if(nnzc[ scan8[i] ])
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FUNCC(ff_h264_idct_add )(dest[j-1] + block_offset[i], block + i*16*sizeof(pixel), stride);
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else if(((dctcoef*)block)[i*16])
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FUNCC(ff_h264_idct_dc_add)(dest[j-1] + block_offset[i], block + i*16*sizeof(pixel), stride);
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}
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}
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}
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/**
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* IDCT transforms the 16 dc values and dequantizes them.
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* @param qmul quantization parameter
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*/
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void FUNCC(ff_h264_luma_dc_dequant_idct)(DCTELEM *_output, DCTELEM *_input, int qmul){
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#define stride 16
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int i;
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int temp[16];
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static const uint8_t x_offset[4]={0, 2*stride, 8*stride, 10*stride};
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dctcoef *input = (dctcoef*)_input;
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dctcoef *output = (dctcoef*)_output;
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for(i=0; i<4; i++){
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const int z0= input[4*i+0] + input[4*i+1];
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const int z1= input[4*i+0] - input[4*i+1];
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const int z2= input[4*i+2] - input[4*i+3];
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const int z3= input[4*i+2] + input[4*i+3];
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temp[4*i+0]= z0+z3;
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temp[4*i+1]= z0-z3;
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temp[4*i+2]= z1-z2;
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temp[4*i+3]= z1+z2;
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}
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for(i=0; i<4; i++){
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const int offset= x_offset[i];
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const int z0= temp[4*0+i] + temp[4*2+i];
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const int z1= temp[4*0+i] - temp[4*2+i];
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const int z2= temp[4*1+i] - temp[4*3+i];
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const int z3= temp[4*1+i] + temp[4*3+i];
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output[stride* 0+offset]= ((((z0 + z3)*qmul + 128 ) >> 8));
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output[stride* 1+offset]= ((((z1 + z2)*qmul + 128 ) >> 8));
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output[stride* 4+offset]= ((((z1 - z2)*qmul + 128 ) >> 8));
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output[stride* 5+offset]= ((((z0 - z3)*qmul + 128 ) >> 8));
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}
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#undef stride
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}
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void FUNCC(ff_h264_chroma_dc_dequant_idct)(DCTELEM *_block, int qmul){
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const int stride= 16*2;
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const int xStride= 16;
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int a,b,c,d,e;
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dctcoef *block = (dctcoef*)_block;
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a= block[stride*0 + xStride*0];
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b= block[stride*0 + xStride*1];
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c= block[stride*1 + xStride*0];
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d= block[stride*1 + xStride*1];
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e= a-b;
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a= a+b;
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b= c-d;
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c= c+d;
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block[stride*0 + xStride*0]= ((a+c)*qmul) >> 7;
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block[stride*0 + xStride*1]= ((e+b)*qmul) >> 7;
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block[stride*1 + xStride*0]= ((a-c)*qmul) >> 7;
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block[stride*1 + xStride*1]= ((e-b)*qmul) >> 7;
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}
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