/* * H.264 IDCT * Copyright (c) 2004-2011 Michael Niedermayer <michaelni@gmx.at> * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file * H.264 IDCT. * @author Michael Niedermayer <michaelni@gmx.at> */ #include "bit_depth_template.c" #include "libavutil/common.h" #include "h264.h" #include "h264idct.h" void FUNCC(ff_h264_idct_add)(uint8_t *_dst, int16_t *_block, int stride) { int i; pixel *dst = (pixel*)_dst; dctcoef *block = (dctcoef*)_block; stride >>= sizeof(pixel)-1; block[0] += 1 << 5; for(i=0; i<4; i++){ const int z0= block[i + 4*0] + block[i + 4*2]; const int z1= block[i + 4*0] - block[i + 4*2]; const int z2= (block[i + 4*1]>>1) - block[i + 4*3]; const int z3= block[i + 4*1] + (block[i + 4*3]>>1); block[i + 4*0]= z0 + z3; block[i + 4*1]= z1 + z2; block[i + 4*2]= z1 - z2; block[i + 4*3]= z0 - z3; } for(i=0; i<4; i++){ const int z0= block[0 + 4*i] + block[2 + 4*i]; const int z1= block[0 + 4*i] - block[2 + 4*i]; const int z2= (block[1 + 4*i]>>1) - block[3 + 4*i]; const int z3= block[1 + 4*i] + (block[3 + 4*i]>>1); dst[i + 0*stride]= av_clip_pixel(dst[i + 0*stride] + ((z0 + z3) >> 6)); dst[i + 1*stride]= av_clip_pixel(dst[i + 1*stride] + ((z1 + z2) >> 6)); dst[i + 2*stride]= av_clip_pixel(dst[i + 2*stride] + ((z1 - z2) >> 6)); dst[i + 3*stride]= av_clip_pixel(dst[i + 3*stride] + ((z0 - z3) >> 6)); } memset(block, 0, 16 * sizeof(dctcoef)); } void FUNCC(ff_h264_idct8_add)(uint8_t *_dst, int16_t *_block, int stride){ int i; pixel *dst = (pixel*)_dst; dctcoef *block = (dctcoef*)_block; stride >>= sizeof(pixel)-1; block[0] += 32; for( i = 0; i < 8; i++ ) { const int a0 = block[i+0*8] + block[i+4*8]; const int a2 = block[i+0*8] - block[i+4*8]; const int a4 = (block[i+2*8]>>1) - block[i+6*8]; const int a6 = (block[i+6*8]>>1) + block[i+2*8]; const int b0 = a0 + a6; const int b2 = a2 + a4; const int b4 = a2 - a4; const int b6 = a0 - a6; const int a1 = -block[i+3*8] + block[i+5*8] - block[i+7*8] - (block[i+7*8]>>1); const int a3 = block[i+1*8] + block[i+7*8] - block[i+3*8] - (block[i+3*8]>>1); const int a5 = -block[i+1*8] + block[i+7*8] + block[i+5*8] + (block[i+5*8]>>1); const int a7 = block[i+3*8] + block[i+5*8] + block[i+1*8] + (block[i+1*8]>>1); const int b1 = (a7>>2) + a1; const int b3 = a3 + (a5>>2); const int b5 = (a3>>2) - a5; const int b7 = a7 - (a1>>2); block[i+0*8] = b0 + b7; block[i+7*8] = b0 - b7; block[i+1*8] = b2 + b5; block[i+6*8] = b2 - b5; block[i+2*8] = b4 + b3; block[i+5*8] = b4 - b3; block[i+3*8] = b6 + b1; block[i+4*8] = b6 - b1; } for( i = 0; i < 8; i++ ) { const int a0 = block[0+i*8] + block[4+i*8]; const int a2 = block[0+i*8] - block[4+i*8]; const int a4 = (block[2+i*8]>>1) - block[6+i*8]; const int a6 = (block[6+i*8]>>1) + block[2+i*8]; const int b0 = a0 + a6; const int b2 = a2 + a4; const int b4 = a2 - a4; const int b6 = a0 - a6; const int a1 = -block[3+i*8] + block[5+i*8] - block[7+i*8] - (block[7+i*8]>>1); const int a3 = block[1+i*8] + block[7+i*8] - block[3+i*8] - (block[3+i*8]>>1); const int a5 = -block[1+i*8] + block[7+i*8] + block[5+i*8] + (block[5+i*8]>>1); const int a7 = block[3+i*8] + block[5+i*8] + block[1+i*8] + (block[1+i*8]>>1); const int b1 = (a7>>2) + a1; const int b3 = a3 + (a5>>2); const int b5 = (a3>>2) - a5; const int b7 = a7 - (a1>>2); dst[i + 0*stride] = av_clip_pixel( dst[i + 0*stride] + ((b0 + b7) >> 6) ); dst[i + 1*stride] = av_clip_pixel( dst[i + 1*stride] + ((b2 + b5) >> 6) ); dst[i + 2*stride] = av_clip_pixel( dst[i + 2*stride] + ((b4 + b3) >> 6) ); dst[i + 3*stride] = av_clip_pixel( dst[i + 3*stride] + ((b6 + b1) >> 6) ); dst[i + 4*stride] = av_clip_pixel( dst[i + 4*stride] + ((b6 - b1) >> 6) ); dst[i + 5*stride] = av_clip_pixel( dst[i + 5*stride] + ((b4 - b3) >> 6) ); dst[i + 6*stride] = av_clip_pixel( dst[i + 6*stride] + ((b2 - b5) >> 6) ); dst[i + 7*stride] = av_clip_pixel( dst[i + 7*stride] + ((b0 - b7) >> 6) ); } memset(block, 0, 64 * sizeof(dctcoef)); } // assumes all AC coefs are 0 void FUNCC(ff_h264_idct_dc_add)(uint8_t *_dst, int16_t *_block, int stride){ int i, j; pixel *dst = (pixel*)_dst; dctcoef *block = (dctcoef*)_block; int dc = (block[0] + 32) >> 6; stride /= sizeof(pixel); block[0] = 0; for( j = 0; j < 4; j++ ) { for( i = 0; i < 4; i++ ) dst[i] = av_clip_pixel( dst[i] + dc ); dst += stride; } } void FUNCC(ff_h264_idct8_dc_add)(uint8_t *_dst, int16_t *_block, int stride){ int i, j; pixel *dst = (pixel*)_dst; dctcoef *block = (dctcoef*)_block; int dc = (block[0] + 32) >> 6; block[0] = 0; stride /= sizeof(pixel); for( j = 0; j < 8; j++ ) { for( i = 0; i < 8; i++ ) dst[i] = av_clip_pixel( dst[i] + dc ); dst += stride; } } void FUNCC(ff_h264_idct_add16)(uint8_t *dst, const int *block_offset, int16_t *block, int stride, const uint8_t nnzc[15*8]){ int i; for(i=0; i<16; i++){ int nnz = nnzc[ scan8[i] ]; if(nnz){ if(nnz==1 && ((dctcoef*)block)[i*16]) FUNCC(ff_h264_idct_dc_add)(dst + block_offset[i], block + i*16*sizeof(pixel), stride); else FUNCC(ff_h264_idct_add )(dst + block_offset[i], block + i*16*sizeof(pixel), stride); } } } void FUNCC(ff_h264_idct_add16intra)(uint8_t *dst, const int *block_offset, int16_t *block, int stride, const uint8_t nnzc[15*8]){ int i; for(i=0; i<16; i++){ if(nnzc[ scan8[i] ]) FUNCC(ff_h264_idct_add )(dst + block_offset[i], block + i*16*sizeof(pixel), stride); else if(((dctcoef*)block)[i*16]) FUNCC(ff_h264_idct_dc_add)(dst + block_offset[i], block + i*16*sizeof(pixel), stride); } } void FUNCC(ff_h264_idct8_add4)(uint8_t *dst, const int *block_offset, int16_t *block, int stride, const uint8_t nnzc[15*8]){ int i; for(i=0; i<16; i+=4){ int nnz = nnzc[ scan8[i] ]; if(nnz){ if(nnz==1 && ((dctcoef*)block)[i*16]) FUNCC(ff_h264_idct8_dc_add)(dst + block_offset[i], block + i*16*sizeof(pixel), stride); else FUNCC(ff_h264_idct8_add )(dst + block_offset[i], block + i*16*sizeof(pixel), stride); } } } void FUNCC(ff_h264_idct_add8)(uint8_t **dest, const int *block_offset, int16_t *block, int stride, const uint8_t nnzc[15*8]){ int i, j; for(j=1; j<3; j++){ for(i=j*16; i<j*16+4; i++){ if(nnzc[ scan8[i] ]) FUNCC(ff_h264_idct_add )(dest[j-1] + block_offset[i], block + i*16*sizeof(pixel), stride); else if(((dctcoef*)block)[i*16]) FUNCC(ff_h264_idct_dc_add)(dest[j-1] + block_offset[i], block + i*16*sizeof(pixel), stride); } } } void FUNCC(ff_h264_idct_add8_422)(uint8_t **dest, const int *block_offset, int16_t *block, int stride, const uint8_t nnzc[15*8]){ int i, j; for(j=1; j<3; j++){ for(i=j*16; i<j*16+4; i++){ if(nnzc[ scan8[i] ]) FUNCC(ff_h264_idct_add )(dest[j-1] + block_offset[i], block + i*16*sizeof(pixel), stride); else if(((dctcoef*)block)[i*16]) FUNCC(ff_h264_idct_dc_add)(dest[j-1] + block_offset[i], block + i*16*sizeof(pixel), stride); } } for(j=1; j<3; j++){ for(i=j*16+4; i<j*16+8; i++){ if(nnzc[ scan8[i+4] ]) FUNCC(ff_h264_idct_add )(dest[j-1] + block_offset[i+4], block + i*16*sizeof(pixel), stride); else if(((dctcoef*)block)[i*16]) FUNCC(ff_h264_idct_dc_add)(dest[j-1] + block_offset[i+4], block + i*16*sizeof(pixel), stride); } } } /** * IDCT transforms the 16 dc values and dequantizes them. * @param qmul quantization parameter */ void FUNCC(ff_h264_luma_dc_dequant_idct)(int16_t *_output, int16_t *_input, int qmul){ #define stride 16 int i; int temp[16]; static const uint8_t x_offset[4]={0, 2*stride, 8*stride, 10*stride}; dctcoef *input = (dctcoef*)_input; dctcoef *output = (dctcoef*)_output; for(i=0; i<4; i++){ const int z0= input[4*i+0] + input[4*i+1]; const int z1= input[4*i+0] - input[4*i+1]; const int z2= input[4*i+2] - input[4*i+3]; const int z3= input[4*i+2] + input[4*i+3]; temp[4*i+0]= z0+z3; temp[4*i+1]= z0-z3; temp[4*i+2]= z1-z2; temp[4*i+3]= z1+z2; } for(i=0; i<4; i++){ const int offset= x_offset[i]; const int z0= temp[4*0+i] + temp[4*2+i]; const int z1= temp[4*0+i] - temp[4*2+i]; const int z2= temp[4*1+i] - temp[4*3+i]; const int z3= temp[4*1+i] + temp[4*3+i]; output[stride* 0+offset]= ((((z0 + z3)*qmul + 128 ) >> 8)); output[stride* 1+offset]= ((((z1 + z2)*qmul + 128 ) >> 8)); output[stride* 4+offset]= ((((z1 - z2)*qmul + 128 ) >> 8)); output[stride* 5+offset]= ((((z0 - z3)*qmul + 128 ) >> 8)); } #undef stride } void FUNCC(ff_h264_chroma422_dc_dequant_idct)(int16_t *_block, int qmul){ const int stride= 16*2; const int xStride= 16; int i; int temp[8]; static const uint8_t x_offset[2]={0, 16}; dctcoef *block = (dctcoef*)_block; for(i=0; i<4; i++){ temp[2*i+0] = block[stride*i + xStride*0] + block[stride*i + xStride*1]; temp[2*i+1] = block[stride*i + xStride*0] - block[stride*i + xStride*1]; } for(i=0; i<2; i++){ const int offset= x_offset[i]; const int z0= temp[2*0+i] + temp[2*2+i]; const int z1= temp[2*0+i] - temp[2*2+i]; const int z2= temp[2*1+i] - temp[2*3+i]; const int z3= temp[2*1+i] + temp[2*3+i]; block[stride*0+offset]= ((z0 + z3)*qmul + 128) >> 8; block[stride*1+offset]= ((z1 + z2)*qmul + 128) >> 8; block[stride*2+offset]= ((z1 - z2)*qmul + 128) >> 8; block[stride*3+offset]= ((z0 - z3)*qmul + 128) >> 8; } } void FUNCC(ff_h264_chroma_dc_dequant_idct)(int16_t *_block, int qmul){ const int stride= 16*2; const int xStride= 16; int a,b,c,d,e; dctcoef *block = (dctcoef*)_block; a= block[stride*0 + xStride*0]; b= block[stride*0 + xStride*1]; c= block[stride*1 + xStride*0]; d= block[stride*1 + xStride*1]; e= a-b; a= a+b; b= c-d; c= c+d; block[stride*0 + xStride*0]= ((a+c)*qmul) >> 7; block[stride*0 + xStride*1]= ((e+b)*qmul) >> 7; block[stride*1 + xStride*0]= ((a-c)*qmul) >> 7; block[stride*1 + xStride*1]= ((e-b)*qmul) >> 7; }