| /* |
| * H.264 IDCT |
| * Copyright (c) 2004 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 libavcodec/h264idct.c |
| * H.264 IDCT. |
| * @author Michael Niedermayer <michaelni@gmx.at> |
| */ |
| |
| #include "dsputil.h" |
| |
| static av_always_inline void idct_internal(uint8_t *dst, DCTELEM *block, int stride, int block_stride, int shift, int add){ |
| int i; |
| uint8_t *cm = ff_cropTbl + MAX_NEG_CROP; |
| |
| block[0] += 1<<(shift-1); |
| |
| for(i=0; i<4; i++){ |
| const int z0= block[0 + block_stride*i] + block[2 + block_stride*i]; |
| const int z1= block[0 + block_stride*i] - block[2 + block_stride*i]; |
| const int z2= (block[1 + block_stride*i]>>1) - block[3 + block_stride*i]; |
| const int z3= block[1 + block_stride*i] + (block[3 + block_stride*i]>>1); |
| |
| block[0 + block_stride*i]= z0 + z3; |
| block[1 + block_stride*i]= z1 + z2; |
| block[2 + block_stride*i]= z1 - z2; |
| block[3 + block_stride*i]= z0 - z3; |
| } |
| |
| for(i=0; i<4; i++){ |
| const int z0= block[i + block_stride*0] + block[i + block_stride*2]; |
| const int z1= block[i + block_stride*0] - block[i + block_stride*2]; |
| const int z2= (block[i + block_stride*1]>>1) - block[i + block_stride*3]; |
| const int z3= block[i + block_stride*1] + (block[i + block_stride*3]>>1); |
| |
| dst[i + 0*stride]= cm[ add*dst[i + 0*stride] + ((z0 + z3) >> shift) ]; |
| dst[i + 1*stride]= cm[ add*dst[i + 1*stride] + ((z1 + z2) >> shift) ]; |
| dst[i + 2*stride]= cm[ add*dst[i + 2*stride] + ((z1 - z2) >> shift) ]; |
| dst[i + 3*stride]= cm[ add*dst[i + 3*stride] + ((z0 - z3) >> shift) ]; |
| } |
| } |
| |
| void ff_h264_idct_add_c(uint8_t *dst, DCTELEM *block, int stride){ |
| idct_internal(dst, block, stride, 4, 6, 1); |
| } |
| |
| void ff_h264_lowres_idct_add_c(uint8_t *dst, int stride, DCTELEM *block){ |
| idct_internal(dst, block, stride, 8, 3, 1); |
| } |
| |
| void ff_h264_lowres_idct_put_c(uint8_t *dst, int stride, DCTELEM *block){ |
| idct_internal(dst, block, stride, 8, 3, 0); |
| } |
| |
| void ff_h264_idct8_add_c(uint8_t *dst, DCTELEM *block, int stride){ |
| int i; |
| uint8_t *cm = ff_cropTbl + MAX_NEG_CROP; |
| |
| block[0] += 32; |
| |
| 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); |
| |
| block[0+i*8] = b0 + b7; |
| block[7+i*8] = b0 - b7; |
| block[1+i*8] = b2 + b5; |
| block[6+i*8] = b2 - b5; |
| block[2+i*8] = b4 + b3; |
| block[5+i*8] = b4 - b3; |
| block[3+i*8] = b6 + b1; |
| block[4+i*8] = b6 - b1; |
| } |
| 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); |
| |
| dst[i + 0*stride] = cm[ dst[i + 0*stride] + ((b0 + b7) >> 6) ]; |
| dst[i + 1*stride] = cm[ dst[i + 1*stride] + ((b2 + b5) >> 6) ]; |
| dst[i + 2*stride] = cm[ dst[i + 2*stride] + ((b4 + b3) >> 6) ]; |
| dst[i + 3*stride] = cm[ dst[i + 3*stride] + ((b6 + b1) >> 6) ]; |
| dst[i + 4*stride] = cm[ dst[i + 4*stride] + ((b6 - b1) >> 6) ]; |
| dst[i + 5*stride] = cm[ dst[i + 5*stride] + ((b4 - b3) >> 6) ]; |
| dst[i + 6*stride] = cm[ dst[i + 6*stride] + ((b2 - b5) >> 6) ]; |
| dst[i + 7*stride] = cm[ dst[i + 7*stride] + ((b0 - b7) >> 6) ]; |
| } |
| } |
| |
| // assumes all AC coefs are 0 |
| void ff_h264_idct_dc_add_c(uint8_t *dst, DCTELEM *block, int stride){ |
| int i, j; |
| uint8_t *cm = ff_cropTbl + MAX_NEG_CROP; |
| int dc = (block[0] + 32) >> 6; |
| for( j = 0; j < 4; j++ ) |
| { |
| for( i = 0; i < 4; i++ ) |
| dst[i] = cm[ dst[i] + dc ]; |
| dst += stride; |
| } |
| } |
| |
| void ff_h264_idct8_dc_add_c(uint8_t *dst, DCTELEM *block, int stride){ |
| int i, j; |
| uint8_t *cm = ff_cropTbl + MAX_NEG_CROP; |
| int dc = (block[0] + 32) >> 6; |
| for( j = 0; j < 8; j++ ) |
| { |
| for( i = 0; i < 8; i++ ) |
| dst[i] = cm[ dst[i] + dc ]; |
| dst += stride; |
| } |
| } |
| |
| //FIXME this table is a duplicate from h264data.h, and will be removed once the tables from, h264 have been split |
| static const uint8_t scan8[16 + 2*4]={ |
| 4+1*8, 5+1*8, 4+2*8, 5+2*8, |
| 6+1*8, 7+1*8, 6+2*8, 7+2*8, |
| 4+3*8, 5+3*8, 4+4*8, 5+4*8, |
| 6+3*8, 7+3*8, 6+4*8, 7+4*8, |
| 1+1*8, 2+1*8, |
| 1+2*8, 2+2*8, |
| 1+4*8, 2+4*8, |
| 1+5*8, 2+5*8, |
| }; |
| |
| void ff_h264_idct_add16_c(uint8_t *dst, const int *block_offset, DCTELEM *block, int stride, const uint8_t nnzc[6*8]){ |
| int i; |
| for(i=0; i<16; i++){ |
| int nnz = nnzc[ scan8[i] ]; |
| if(nnz){ |
| if(nnz==1 && block[i*16]) ff_h264_idct_dc_add_c(dst + block_offset[i], block + i*16, stride); |
| else idct_internal (dst + block_offset[i], block + i*16, stride, 4, 6, 1); |
| } |
| } |
| } |
| |
| void ff_h264_idct_add16intra_c(uint8_t *dst, const int *block_offset, DCTELEM *block, int stride, const uint8_t nnzc[6*8]){ |
| int i; |
| for(i=0; i<16; i++){ |
| if(nnzc[ scan8[i] ]) idct_internal (dst + block_offset[i], block + i*16, stride, 4, 6, 1); |
| else if(block[i*16]) ff_h264_idct_dc_add_c(dst + block_offset[i], block + i*16, stride); |
| } |
| } |
| |
| void ff_h264_idct8_add4_c(uint8_t *dst, const int *block_offset, DCTELEM *block, int stride, const uint8_t nnzc[6*8]){ |
| int i; |
| for(i=0; i<16; i+=4){ |
| int nnz = nnzc[ scan8[i] ]; |
| if(nnz){ |
| if(nnz==1 && block[i*16]) ff_h264_idct8_dc_add_c(dst + block_offset[i], block + i*16, stride); |
| else ff_h264_idct8_add_c (dst + block_offset[i], block + i*16, stride); |
| } |
| } |
| } |
| |
| void ff_h264_idct_add8_c(uint8_t **dest, const int *block_offset, DCTELEM *block, int stride, const uint8_t nnzc[6*8]){ |
| int i; |
| for(i=16; i<16+8; i++){ |
| if(nnzc[ scan8[i] ]) |
| ff_h264_idct_add_c (dest[(i&4)>>2] + block_offset[i], block + i*16, stride); |
| else if(block[i*16]) |
| ff_h264_idct_dc_add_c(dest[(i&4)>>2] + block_offset[i], block + i*16, stride); |
| } |
| } |