static void filter_mb_edgeh( H264Context *h, uint8_t *pix, int stride, int bS[4], int qp ) { int i, d; const int index_a = clip( qp + h->slice_alpha_c0_offset, 0, 51 ); const int alpha = alpha_table[index_a]; const int beta = beta_table[clip( qp + h->slice_beta_offset, 0, 51 )]; const int pix_next = stride; for( i = 0; i < 4; i++ ) { if( bS[i] == 0 ) { pix += 4; continue; } /* 4px edge length */ for( d = 0; d < 4; d++ ) { const uint8_t p0 = pix[-1*pix_next]; const uint8_t p1 = pix[-2*pix_next]; const uint8_t p2 = pix[-3*pix_next]; const uint8_t q0 = pix[0]; const uint8_t q1 = pix[1*pix_next]; const uint8_t q2 = pix[2*pix_next]; if( abs( p0 - q0 ) >= alpha || abs( p1 - p0 ) >= beta || abs( q1 - q0 ) >= beta ) { pix++; continue; } if( bS[i] < 4 ) { const int tc0 = tc0_table[index_a][bS[i] - 1]; int tc = tc0; int i_delta; if( abs( p2 - p0 ) < beta ) { pix[-2*pix_next] = p1 + clip( ( p2 + ( ( p0 + q0 + 1 ) >> 1 ) - ( p1 << 1 ) ) >> 1, -tc0, tc0 ); tc++; } if( abs( q2 - q0 ) < beta ) { pix[pix_next] = q1 + clip( ( q2 + ( ( p0 + q0 + 1 ) >> 1 ) - ( q1 << 1 ) ) >> 1, -tc0, tc0 ); tc++; } i_delta = clip( (((q0 - p0 ) << 2) + (p1 - q1) + 4) >> 3, -tc, tc ); pix[-pix_next] = clip( p0 + i_delta, 0, 255 ); /* p0' */ pix[0] = clip( q0 - i_delta, 0, 255 ); /* q0' */ } else { const uint8_t p3 = pix[-4*pix_next]; const uint8_t q3 = pix[ 3*pix_next]; const int c = abs( p0 - q0 ) < (( alpha >> 2 ) + 2 ); if( abs( p2 - p0 ) < beta && c ) { /* p0', p1', p2' */ pix[-1*pix_next] = ( p2 + 2*p1 + 2*p0 + 2*q0 + q1 + 4 ) >> 3; pix[-2*pix_next] = ( p2 + p1 + p0 + q0 + 2 ) >> 2; pix[-3*pix_next] = ( 2*p3 + 3*p2 + p1 + p0 + q0 + 4 ) >> 3; } else { /* p0' */ pix[-1*pix_next] = ( 2*p1 + p0 + q1 + 2 ) >> 2; } if( abs( q2 - q0 ) < beta && c ) { /* q0', q1', q2' */ pix[0*pix_next] = ( p1 + 2*p0 + 2*q0 + 2*q1 + q2 + 4 ) >> 3; pix[1*pix_next] = ( p0 + q0 + q1 + q2 + 2 ) >> 2; pix[2*pix_next] = ( 2*q3 + 3*q2 + q1 + q0 + p0 + 4 ) >> 3; } else { /* q0' */ pix[0*pix_next] = ( 2*q1 + q0 + p1 + 2 ) >> 2; } } pix++; } } }