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RV40 loop filter
Originally committed as revision 15950 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Kostya Shishkov
parent
de8cac167d
commit
d33ee3f2b1
@ -389,6 +389,243 @@ static void rv40_h_loop_filter(uint8_t *src, int stride, int dmode,
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alpha, beta, beta2, chroma, edge);
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}
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enum RV40BlockPos{
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POS_CUR,
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POS_TOP,
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POS_LEFT,
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POS_BOTTOM,
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};
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#define MASK_CUR 0x0001
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#define MASK_RIGHT 0x0008
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#define MASK_BOTTOM 0x0010
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#define MASK_TOP 0x1000
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#define MASK_Y_TOP_ROW 0x000F
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#define MASK_Y_LAST_ROW 0xF000
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#define MASK_Y_LEFT_COL 0x1111
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#define MASK_Y_RIGHT_COL 0x8888
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#define MASK_C_TOP_ROW 0x0003
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#define MASK_C_LAST_ROW 0x000C
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#define MASK_C_LEFT_COL 0x0005
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#define MASK_C_RIGHT_COL 0x000A
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static const int neighbour_offs_x[4] = { 0, 0, -1, 0 };
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static const int neighbour_offs_y[4] = { 0, -1, 0, 1 };
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/**
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* RV40 loop filtering function
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*/
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static void rv40_loop_filter(RV34DecContext *r, int row)
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{
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MpegEncContext *s = &r->s;
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int mb_pos, mb_x;
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int i, j, k;
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uint8_t *Y, *C;
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int alpha, beta, betaY, betaC;
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int q;
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int mbtype[4]; ///< current macroblock and its neighbours types
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/**
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* flags indicating that macroblock can be filtered with strong filter
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* it is set only for intra coded MB and MB with DCs coded separately
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*/
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int mb_strong[4];
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int clip[4]; ///< MB filter clipping value calculated from filtering strength
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/**
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* coded block patterns for luma part of current macroblock and its neighbours
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* Format:
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* LSB corresponds to the top left block,
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* each nibble represents one row of subblocks.
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*/
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int cbp[4];
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/**
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* coded block patterns for chroma part of current macroblock and its neighbours
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* Format is the same as for luma with two subblocks in a row.
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*/
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int uvcbp[4][2];
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/**
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* This mask represents the pattern of luma subblocks that should be filtered
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* in addition to the coded ones because because they lie at the edge of
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* 8x8 block with different enough motion vectors
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*/
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int mvmasks[4];
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mb_pos = row * s->mb_stride;
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for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
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int mbtype = s->current_picture_ptr->mb_type[mb_pos];
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if(IS_INTRA(mbtype) || IS_SEPARATE_DC(mbtype))
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r->cbp_luma [mb_pos] = 0xFFFF;
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if(IS_INTRA(mbtype))
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r->cbp_chroma[mb_pos] = 0xFF;
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}
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mb_pos = row * s->mb_stride;
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for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
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int y_h_deblock, y_v_deblock;
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int c_v_deblock[2], c_h_deblock[2];
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int clip_left;
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int avail[4];
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int y_to_deblock, c_to_deblock[2];
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q = s->current_picture_ptr->qscale_table[mb_pos];
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alpha = rv40_alpha_tab[q];
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beta = rv40_beta_tab [q];
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betaY = betaC = beta * 3;
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if(s->width * s->height <= 176*144)
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betaY += beta;
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avail[0] = 1;
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avail[1] = row;
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avail[2] = mb_x;
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avail[3] = row < s->mb_height - 1;
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for(i = 0; i < 4; i++){
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if(avail[i]){
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int pos = mb_pos + neighbour_offs_x[i] + neighbour_offs_y[i]*s->mb_stride;
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mvmasks[i] = r->deblock_coefs[pos];
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mbtype [i] = s->current_picture_ptr->mb_type[pos];
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cbp [i] = r->cbp_luma[pos];
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uvcbp[i][0] = r->cbp_chroma[pos] & 0xF;
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uvcbp[i][1] = r->cbp_chroma[pos] >> 4;
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}else{
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mvmasks[i] = 0;
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mbtype [i] = mbtype[0];
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cbp [i] = 0;
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uvcbp[i][0] = uvcbp[i][1] = 0;
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}
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mb_strong[i] = IS_INTRA(mbtype[i]) || IS_SEPARATE_DC(mbtype[i]);
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clip[i] = rv40_filter_clip_tbl[mb_strong[i] + 1][q];
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}
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y_to_deblock = cbp[POS_CUR]
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| (cbp[POS_BOTTOM] << 16)
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| mvmasks[POS_CUR]
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| (mvmasks[POS_BOTTOM] << 16);
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/* This pattern contains bits signalling that horizontal edges of
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* the current block can be filtered.
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* That happens when either of adjacent subblocks is coded or lies on
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* the edge of 8x8 blocks with motion vectors differing by more than
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* 3/4 pel in any component (any edge orientation for some reason).
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*/
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y_h_deblock = y_to_deblock
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| ((cbp[POS_CUR] << 4) & ~MASK_Y_TOP_ROW)
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| ((cbp[POS_TOP] & MASK_Y_LAST_ROW) >> 12);
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/* This pattern contains bits signalling that vertical edges of
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* the current block can be filtered.
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* That happens when either of adjacent subblocks is coded or lies on
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* the edge of 8x8 blocks with motion vectors differing by more than
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* 3/4 pel in any component (any edge orientation for some reason).
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*/
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y_v_deblock = y_to_deblock
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| ((cbp[POS_CUR] << 1) & ~MASK_Y_LEFT_COL)
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| ((cbp[POS_LEFT] & MASK_Y_RIGHT_COL) >> 3);
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if(!mb_x)
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y_v_deblock &= ~MASK_Y_LEFT_COL;
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if(!row)
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y_h_deblock &= ~MASK_Y_TOP_ROW;
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if(row == s->mb_height - 1 || (mb_strong[POS_CUR] || mb_strong[POS_BOTTOM]))
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y_h_deblock &= ~(MASK_Y_TOP_ROW << 16);
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/* Calculating chroma patterns is similar and easier since there is
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* no motion vector pattern for them.
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*/
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for(i = 0; i < 2; i++){
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c_to_deblock[i] = (uvcbp[POS_BOTTOM][i] << 4) | uvcbp[POS_CUR][i];
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c_v_deblock[i] = c_to_deblock[i]
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| ((uvcbp[POS_CUR] [i] << 1) & ~MASK_C_LEFT_COL)
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| ((uvcbp[POS_LEFT][i] & MASK_C_RIGHT_COL) >> 1);
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c_h_deblock[i] = c_to_deblock[i]
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| ((uvcbp[POS_TOP][i] & MASK_C_LAST_ROW) >> 2)
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| (uvcbp[POS_CUR][i] << 2);
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if(!mb_x)
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c_v_deblock[i] &= ~MASK_C_LEFT_COL;
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if(!row)
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c_h_deblock[i] &= ~MASK_C_TOP_ROW;
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if(row == s->mb_height - 1 || mb_strong[POS_CUR] || mb_strong[POS_BOTTOM])
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c_h_deblock[i] &= ~(MASK_C_TOP_ROW << 4);
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}
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for(j = 0; j < 16; j += 4){
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Y = s->current_picture_ptr->data[0] + mb_x*16 + (row*16 + j) * s->linesize;
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for(i = 0; i < 4; i++, Y += 4){
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int ij = i + j;
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int clip_cur = y_to_deblock & (MASK_CUR << ij) ? clip[POS_CUR] : 0;
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int dither = j ? ij : i*4;
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// if bottom block is coded then we can filter its top edge
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// (or bottom edge of this block, which is the same)
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if(y_h_deblock & (MASK_BOTTOM << ij)){
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rv40_h_loop_filter(Y+4*s->linesize, s->linesize, dither,
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y_to_deblock & (MASK_BOTTOM << ij) ? clip[POS_CUR] : 0,
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clip_cur,
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alpha, beta, betaY, 0, 0);
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}
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// filter left block edge in ordinary mode (with low filtering strength)
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if(y_v_deblock & (MASK_CUR << ij) && (i || !(mb_strong[POS_CUR] || mb_strong[POS_LEFT]))){
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if(!i)
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clip_left = (cbp[POS_LEFT] | mvmasks[POS_LEFT]) & (MASK_RIGHT << j) ? clip[POS_LEFT] : 0;
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else
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clip_left = y_to_deblock & (MASK_CUR << (ij-1)) ? clip[POS_CUR] : 0;
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rv40_v_loop_filter(Y, s->linesize, dither,
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clip_cur,
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clip_left,
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alpha, beta, betaY, 0, 0);
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}
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// filter top edge of the current macroblock when filtering strength is high
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if(!j && y_h_deblock & (MASK_CUR << i) && (mb_strong[POS_CUR] || mb_strong[POS_TOP])){
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rv40_h_loop_filter(Y, s->linesize, dither,
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clip_cur,
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(cbp[POS_TOP] | mvmasks[POS_TOP]) & (MASK_TOP << i) ? clip[POS_TOP] : 0,
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alpha, beta, betaY, 0, 1);
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}
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// filter left block edge in edge mode (with high filtering strength)
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if(y_v_deblock & (MASK_CUR << ij) && !i && (mb_strong[POS_CUR] || mb_strong[POS_LEFT])){
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clip_left = (cbp[POS_LEFT] | mvmasks[POS_LEFT]) & (MASK_RIGHT << j) ? clip[POS_LEFT] : 0;
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rv40_v_loop_filter(Y, s->linesize, dither,
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clip_cur,
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clip_left,
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alpha, beta, betaY, 0, 1);
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}
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}
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}
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for(k = 0; k < 2; k++){
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for(j = 0; j < 2; j++){
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C = s->current_picture_ptr->data[k+1] + mb_x*8 + (row*8 + j*4) * s->uvlinesize;
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for(i = 0; i < 2; i++, C += 4){
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int ij = i + j*2;
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int clip_cur = c_to_deblock[k] & (MASK_CUR << ij) ? clip[POS_CUR] : 0;
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if(c_h_deblock[k] & (MASK_CUR << (ij+2))){
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int clip_bot = c_to_deblock[k] & (MASK_CUR << (ij+2)) ? clip[POS_CUR] : 0;
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rv40_h_loop_filter(C+4*s->uvlinesize, s->uvlinesize, i*8,
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clip_bot,
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clip_cur,
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alpha, beta, betaC, 1, 0);
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}
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if((c_v_deblock[k] & (MASK_CUR << ij)) && (i || !(mb_strong[POS_CUR] || mb_strong[POS_LEFT]))){
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if(!i)
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clip_left = uvcbp[POS_LEFT][k] & (MASK_CUR << (2*j+1)) ? clip[POS_LEFT] : 0;
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else
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clip_left = c_to_deblock[k] & (MASK_CUR << (ij-1)) ? clip[POS_CUR] : 0;
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rv40_v_loop_filter(C, s->uvlinesize, j*8,
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clip_cur,
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clip_left,
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alpha, beta, betaC, 1, 0);
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}
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if(!j && c_h_deblock[k] & (MASK_CUR << ij) && (mb_strong[POS_CUR] || mb_strong[POS_TOP])){
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int clip_top = uvcbp[POS_TOP][k] & (MASK_CUR << (ij+2)) ? clip[POS_TOP] : 0;
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rv40_h_loop_filter(C, s->uvlinesize, i*8,
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clip_cur,
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clip_top,
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alpha, beta, betaC, 1, 1);
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}
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if(c_v_deblock[k] & (MASK_CUR << ij) && !i && (mb_strong[POS_CUR] || mb_strong[POS_LEFT])){
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clip_left = uvcbp[POS_LEFT][k] & (MASK_CUR << (2*j+1)) ? clip[POS_LEFT] : 0;
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rv40_v_loop_filter(C, s->uvlinesize, j*8,
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clip_cur,
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clip_left,
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alpha, beta, betaC, 1, 1);
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}
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}
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}
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}
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}
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}
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/**
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* Initialize decoder.
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*/
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@ -403,6 +640,7 @@ static av_cold int rv40_decode_init(AVCodecContext *avctx)
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r->parse_slice_header = rv40_parse_slice_header;
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r->decode_intra_types = rv40_decode_intra_types;
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r->decode_mb_info = rv40_decode_mb_info;
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r->loop_filter = rv40_loop_filter;
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r->luma_dc_quant_i = rv40_luma_dc_quant[0];
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r->luma_dc_quant_p = rv40_luma_dc_quant[1];
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return 0;
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