static void filter_mb_edgech( 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 += 2; continue; } /* 2px edge length (see deblocking_filter_edgecv) */ for( d = 0; d < 2; d++ ) { const uint8_t p0 = pix[-1*pix_next]; const uint8_t p1 = pix[-2*pix_next]; const uint8_t q0 = pix[0]; const uint8_t q1 = pix[1*pix_next]; if( abs( p0 - q0 ) >= alpha || abs( p1 - p0 ) >= beta || abs( q1 - q0 ) >= beta ) { pix++; continue; } if( bS[i] < 4 ) { int tc = tc0_table[index_a][bS[i] - 1] + 1; int 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 { pix[-pix_next] = ( 2*p1 + p0 + q1 + 2 ) >> 2; /* p0' */ pix[0] = ( 2*q1 + q0 + p1 + 2 ) >> 2; /* q0' */ } pix++; } } }