| /* |
| * 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 "high_bit_depth.h" |
| |
| #ifndef AVCODEC_H264IDCT_INTERNAL_H |
| #define AVCODEC_H264IDCT_INTERNAL_H |
| //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*3]={ |
| 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, |
| 4+ 6*8, 5+ 6*8, 4+ 7*8, 5+ 7*8, |
| 6+ 6*8, 7+ 6*8, 6+ 7*8, 7+ 7*8, |
| 4+ 8*8, 5+ 8*8, 4+ 9*8, 5+ 9*8, |
| 6+ 8*8, 7+ 8*8, 6+ 9*8, 7+ 9*8, |
| 4+11*8, 5+11*8, 4+12*8, 5+12*8, |
| 6+11*8, 7+11*8, 6+12*8, 7+12*8, |
| 4+13*8, 5+13*8, 4+14*8, 5+14*8, |
| 6+13*8, 7+13*8, 6+14*8, 7+14*8 |
| }; |
| #endif |
| |
| static av_always_inline void FUNCC(idct_internal)(uint8_t *p_dst, DCTELEM *p_block, int stride, int block_stride, int shift, int add){ |
| int i; |
| INIT_CLIP |
| pixel *dst = (pixel*)p_dst; |
| dctcoef *block = (dctcoef*)p_block; |
| stride >>= sizeof(pixel)-1; |
| |
| block[0] += 1<<(shift-1); |
| |
| 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); |
| |
| block[i + block_stride*0]= z0 + z3; |
| block[i + block_stride*1]= z1 + z2; |
| block[i + block_stride*2]= z1 - z2; |
| block[i + block_stride*3]= z0 - z3; |
| } |
| |
| 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); |
| |
| dst[i + 0*stride]= CLIP(add*dst[i + 0*stride] + ((z0 + z3) >> shift)); |
| dst[i + 1*stride]= CLIP(add*dst[i + 1*stride] + ((z1 + z2) >> shift)); |
| dst[i + 2*stride]= CLIP(add*dst[i + 2*stride] + ((z1 - z2) >> shift)); |
| dst[i + 3*stride]= CLIP(add*dst[i + 3*stride] + ((z0 - z3) >> shift)); |
| } |
| } |
| |
| void FUNCC(ff_h264_idct_add)(uint8_t *dst, DCTELEM *block, int stride){ |
| FUNCC(idct_internal)(dst, block, stride, 4, 6, 1); |
| } |
| |
| void FUNCC(ff_h264_lowres_idct_add)(uint8_t *dst, int stride, DCTELEM *block){ |
| FUNCC(idct_internal)(dst, block, stride, 8, 3, 1); |
| } |
| |
| void FUNCC(ff_h264_lowres_idct_put)(uint8_t *dst, int stride, DCTELEM *block){ |
| FUNCC(idct_internal)(dst, block, stride, 8, 3, 0); |
| } |
| |
| void FUNCC(ff_h264_idct8_add)(uint8_t *p_dst, DCTELEM *p_block, int stride){ |
| int i; |
| INIT_CLIP |
| pixel *dst = (pixel*)p_dst; |
| dctcoef *block = (dctcoef*)p_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] = CLIP( dst[i + 0*stride] + ((b0 + b7) >> 6) ); |
| dst[i + 1*stride] = CLIP( dst[i + 1*stride] + ((b2 + b5) >> 6) ); |
| dst[i + 2*stride] = CLIP( dst[i + 2*stride] + ((b4 + b3) >> 6) ); |
| dst[i + 3*stride] = CLIP( dst[i + 3*stride] + ((b6 + b1) >> 6) ); |
| dst[i + 4*stride] = CLIP( dst[i + 4*stride] + ((b6 - b1) >> 6) ); |
| dst[i + 5*stride] = CLIP( dst[i + 5*stride] + ((b4 - b3) >> 6) ); |
| dst[i + 6*stride] = CLIP( dst[i + 6*stride] + ((b2 - b5) >> 6) ); |
| dst[i + 7*stride] = CLIP( dst[i + 7*stride] + ((b0 - b7) >> 6) ); |
| } |
| } |
| |
| // assumes all AC coefs are 0 |
| void FUNCC(ff_h264_idct_dc_add)(uint8_t *p_dst, DCTELEM *block, int stride){ |
| int i, j; |
| int dc = (((dctcoef*)block)[0] + 32) >> 6; |
| INIT_CLIP |
| pixel *dst = (pixel*)p_dst; |
| stride >>= sizeof(pixel)-1; |
| for( j = 0; j < 4; j++ ) |
| { |
| for( i = 0; i < 4; i++ ) |
| dst[i] = CLIP( dst[i] + dc ); |
| dst += stride; |
| } |
| } |
| |
| void FUNCC(ff_h264_idct8_dc_add)(uint8_t *p_dst, DCTELEM *block, int stride){ |
| int i, j; |
| int dc = (((dctcoef*)block)[0] + 32) >> 6; |
| INIT_CLIP |
| pixel *dst = (pixel*)p_dst; |
| stride >>= sizeof(pixel)-1; |
| for( j = 0; j < 8; j++ ) |
| { |
| for( i = 0; i < 8; i++ ) |
| dst[i] = CLIP( dst[i] + dc ); |
| dst += stride; |
| } |
| } |
| |
| void FUNCC(ff_h264_idct_add16)(uint8_t *dst, const int *block_offset, DCTELEM *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(idct_internal )(dst + block_offset[i], block + i*16*sizeof(pixel), stride, 4, 6, 1); |
| } |
| } |
| } |
| |
| void FUNCC(ff_h264_idct_add16intra)(uint8_t *dst, const int *block_offset, DCTELEM *block, int stride, const uint8_t nnzc[15*8]){ |
| int i; |
| for(i=0; i<16; i++){ |
| if(nnzc[ scan8[i] ]) FUNCC(idct_internal )(dst + block_offset[i], block + i*16*sizeof(pixel), stride, 4, 6, 1); |
| 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, DCTELEM *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, DCTELEM *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); |
| } |
| } |
| } |
| /** |
| * IDCT transforms the 16 dc values and dequantizes them. |
| */ |
| void FUNCC(ff_h264_luma_dc_dequant_idct)(DCTELEM *p_output, DCTELEM *p_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*)p_input; |
| dctcoef *output = (dctcoef*)p_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_chroma_dc_dequant_idct)(DCTELEM *p_block, int qmul){ |
| const int stride= 16*2; |
| const int xStride= 16; |
| int a,b,c,d,e; |
| dctcoef *block = (dctcoef*)p_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; |
| } |