From 541e8f3beccbe806599e9af4902d1e68b4367b80 Mon Sep 17 00:00:00 2001 From: Kostya Shishkov Date: Sat, 20 Dec 2008 06:09:54 +0000 Subject: RV30 loop filter Originally committed as revision 16245 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavcodec/rv30.c | 122 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 122 insertions(+) (limited to 'libavcodec/rv30.c') diff --git a/libavcodec/rv30.c b/libavcodec/rv30.c index 0202873e1a..97d87b0710 100644 --- a/libavcodec/rv30.c +++ b/libavcodec/rv30.c @@ -112,6 +112,127 @@ static int rv30_decode_mb_info(RV34DecContext *r) return rv30_b_types[code]; } +static inline void rv30_weak_loop_filter(uint8_t *src, const int step, + const int stride, const int lim) +{ + uint8_t *cm = ff_cropTbl + MAX_NEG_CROP; + int i, diff; + + for(i = 0; i < 4; i++){ + diff = ((src[-2*step] - src[1*step]) - (src[-1*step] - src[0*step])*4) >> 3; + diff = av_clip(diff, -lim, lim); + src[-1*step] = cm[src[-1*step] + diff]; + src[ 0*step] = cm[src[ 0*step] - diff]; + src += stride; + } +} + +static void rv30_loop_filter(RV34DecContext *r, int row) +{ + MpegEncContext *s = &r->s; + int mb_pos, mb_x; + int i, j, k; + uint8_t *Y, *C; + int loc_lim, cur_lim, left_lim = 0, top_lim = 0; + + mb_pos = row * s->mb_stride; + for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){ + int mbtype = s->current_picture_ptr->mb_type[mb_pos]; + if(IS_INTRA(mbtype) || IS_SEPARATE_DC(mbtype)) + r->deblock_coefs[mb_pos] = 0xFFFF; + if(IS_INTRA(mbtype)) + r->cbp_chroma[mb_pos] = 0xFF; + } + + /* all vertical edges are filtered first + * and horizontal edges are filtered on the next iteration + */ + mb_pos = row * s->mb_stride; + for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){ + cur_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos]]; + if(mb_x) + left_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos - 1]]; + for(j = 0; j < 16; j += 4){ + Y = s->current_picture_ptr->data[0] + mb_x*16 + (row*16 + j) * s->linesize + 4 * !mb_x; + for(i = !mb_x; i < 4; i++, Y += 4){ + int ij = i + j; + loc_lim = 0; + if(r->deblock_coefs[mb_pos] & (1 << ij)) + loc_lim = cur_lim; + else if(!i && r->deblock_coefs[mb_pos - 1] & (1 << (ij + 3))) + loc_lim = left_lim; + else if( i && r->deblock_coefs[mb_pos] & (1 << (ij - 1))) + loc_lim = cur_lim; + if(loc_lim) + rv30_weak_loop_filter(Y, 1, s->linesize, loc_lim); + } + } + for(k = 0; k < 2; k++){ + int cur_cbp, left_cbp = 0; + cur_cbp = (r->cbp_chroma[mb_pos] >> (k*4)) & 0xF; + if(mb_x) + left_cbp = (r->cbp_chroma[mb_pos - 1] >> (k*4)) & 0xF; + for(j = 0; j < 8; j += 4){ + C = s->current_picture_ptr->data[k+1] + mb_x*8 + (row*8 + j) * s->uvlinesize + 4 * !mb_x; + for(i = !mb_x; i < 2; i++, C += 4){ + int ij = i + (j >> 1); + loc_lim = 0; + if(cur_cbp && (1 << ij)) + loc_lim = cur_lim; + else if(!i && left_cbp & (1 << (ij + 1))) + loc_lim = left_lim; + else if( i && cur_cbp & (1 << (ij - 1))) + loc_lim = cur_lim; + if(loc_lim) + rv30_weak_loop_filter(C, 1, s->uvlinesize, loc_lim); + } + } + } + } + mb_pos = row * s->mb_stride; + for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){ + cur_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos]]; + if(row) + top_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos - s->mb_stride]]; + for(j = 4*!row; j < 16; j += 4){ + Y = s->current_picture_ptr->data[0] + mb_x*16 + (row*16 + j) * s->linesize; + for(i = 0; i < 4; i++, Y += 4){ + int ij = i + j; + loc_lim = 0; + if(r->deblock_coefs[mb_pos] & (1 << ij)) + loc_lim = cur_lim; + else if(!j && r->deblock_coefs[mb_pos - s->mb_stride] & (1 << (ij + 12))) + loc_lim = top_lim; + else if( j && r->deblock_coefs[mb_pos] & (1 << (ij - 4))) + loc_lim = cur_lim; + if(loc_lim) + rv30_weak_loop_filter(Y, s->linesize, 1, loc_lim); + } + } + for(k = 0; k < 2; k++){ + int cur_cbp, top_cbp = 0; + cur_cbp = (r->cbp_chroma[mb_pos] >> (k*4)) & 0xF; + if(row) + top_cbp = (r->cbp_chroma[mb_pos - s->mb_stride] >> (k*4)) & 0xF; + for(j = 4*!row; j < 8; j += 4){ + C = s->current_picture_ptr->data[k+1] + mb_x*8 + (row*8 + j) * s->uvlinesize; + for(i = 0; i < 2; i++, C += 4){ + int ij = i + (j >> 1); + loc_lim = 0; + if(r->cbp_chroma[mb_pos] && (1 << ij)) + loc_lim = cur_lim; + else if(!j && top_cbp & (1 << (ij + 2))) + loc_lim = top_lim; + else if( j && cur_cbp & (1 << (ij - 2))) + loc_lim = cur_lim; + if(loc_lim) + rv30_weak_loop_filter(C, s->uvlinesize, 1, loc_lim); + } + } + } + } +} + /** * Initialize decoder. */ @@ -130,6 +251,7 @@ static av_cold int rv30_decode_init(AVCodecContext *avctx) r->parse_slice_header = rv30_parse_slice_header; r->decode_intra_types = rv30_decode_intra_types; r->decode_mb_info = rv30_decode_mb_info; + r->loop_filter = rv30_loop_filter; r->luma_dc_quant_i = rv30_luma_dc_quant; r->luma_dc_quant_p = rv30_luma_dc_quant; return 0; -- cgit v1.2.3