Proper support for B/BI frames
Originally committed as revision 6207 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Kostya Shishkov
parent
0288a7474b
commit
1dc1ce643e
311
libavcodec/vc1.c
311
libavcodec/vc1.c
@ -369,6 +369,7 @@ typedef struct VC1Context{
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//@}
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int p_frame_skipped;
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int bi_type;
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} VC1Context;
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/**
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@ -778,8 +779,14 @@ static void vc1_mc_1mv(VC1Context *v, int dir)
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if(!v->s.last_picture.data[0])return;
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mx = s->mv[0][0][0];
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my = s->mv[0][0][1];
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mx = s->mv[dir][0][0];
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my = s->mv[dir][0][1];
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// store motion vectors for further use in B frames
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if(s->pict_type == P_TYPE) {
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s->current_picture.motion_val[1][s->block_index[0]][0] = mx;
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s->current_picture.motion_val[1][s->block_index[0]][1] = my;
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}
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uvmx = (mx + ((mx & 3) == 3)) >> 1;
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uvmy = (my + ((my & 3) == 3)) >> 1;
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if(!dir) {
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@ -1040,6 +1047,8 @@ static void vc1_mc_4mv_chroma(VC1Context *v)
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} else
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return; //no need to do MC for inter blocks
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s->current_picture.motion_val[1][s->block_index[0]][0] = tx;
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s->current_picture.motion_val[1][s->block_index[0]][1] = ty;
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uvmx = (tx + ((tx&3) == 3)) >> 1;
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uvmy = (ty + ((ty&3) == 3)) >> 1;
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@ -1383,18 +1392,19 @@ static int vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)
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} else v->s.pict_type = P_TYPE;
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} else v->s.pict_type = v->s.pict_type ? P_TYPE : I_TYPE;
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if(v->s.pict_type == I_TYPE)
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get_bits(gb, 7); // skip buffer fullness
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v->bi_type = 0;
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if(v->s.pict_type == B_TYPE) {
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v->bfraction = get_vlc2(gb, vc1_bfraction_vlc.table, VC1_BFRACTION_VLC_BITS, 1);
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v->bfraction = vc1_bfraction_lut[v->bfraction];
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if(v->bfraction == -1) {
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if(v->bfraction == 0) {
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v->s.pict_type = BI_TYPE;
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}
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}
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if(v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)
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get_bits(gb, 7); // skip buffer fullness
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/* calculate RND */
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if(v->s.pict_type == I_TYPE)
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if(v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)
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v->rnd = 1;
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if(v->s.pict_type == P_TYPE)
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v->rnd ^= 1;
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@ -1568,6 +1578,10 @@ static int vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)
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/* DC Syntax */
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v->s.dc_table_index = get_bits(gb, 1);
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if(v->s.pict_type == BI_TYPE) {
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v->s.pict_type = B_TYPE;
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v->bi_type = 1;
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}
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return 0;
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}
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@ -2078,71 +2092,242 @@ static void vc1_interp_mc(VC1Context *v)
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dsp->avg_qpel_pixels_tab[1][uvdxy](s->dest[2], srcV, s->uvlinesize);
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}
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static always_inline int scale_mv(int value, int bfrac, int inv, int qs)
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{
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int n = bfrac;
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#if B_FRACTION_DEN==256
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if(inv)
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n -= 256;
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if(!qs)
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return 2 * ((value * n + 255) >> 9);
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return (value * n + 128) >> 8;
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#else
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if(inv)
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n -= B_FRACTION_DEN;
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if(!qs)
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return 2 * ((value * n + B_FRACTION_DEN - 1) / (2 * B_FRACTION_DEN));
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return (value * n + B_FRACTION_DEN/2) / B_FRACTION_DEN;
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#endif
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}
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/** Reconstruct motion vector for B-frame and do motion compensation
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*/
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static inline void vc1_b_mc(VC1Context *v, int dmv_x[2], int dmv_y[2], int direct, int mode)
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{
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MpegEncContext *s = &v->s;
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int mx[4], my[4], mv_x, mv_y;
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int i;
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if(direct) {
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vc1_mc_1mv(v, 0);
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vc1_interp_mc(v);
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return;
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}
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if(mode == BMV_TYPE_INTERPOLATED) {
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vc1_mc_1mv(v, 0);
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vc1_interp_mc(v);
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return;
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}
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vc1_mc_1mv(v, (mode == BMV_TYPE_FORWARD));
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}
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static inline void vc1_pred_b_mv(VC1Context *v, int dmv_x[2], int dmv_y[2], int direct, int mvtype)
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{
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MpegEncContext *s = &v->s;
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int xy, wrap, off = 0;
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int16_t *A, *B, *C;
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int px, py;
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int sum;
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int r_x, r_y;
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const uint8_t *is_intra = v->mb_type[0];
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r_x = v->range_x;
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r_y = v->range_y;
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/* scale MV difference to be quad-pel */
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dmv_x[0] <<= 1 - s->quarter_sample;
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dmv_y[0] <<= 1 - s->quarter_sample;
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dmv_x[1] <<= 1 - s->quarter_sample;
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dmv_y[1] <<= 1 - s->quarter_sample;
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wrap = s->b8_stride;
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xy = s->block_index[0];
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if(s->mb_intra) {
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s->current_picture.motion_val[0][xy][0] =
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s->current_picture.motion_val[0][xy][1] =
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s->current_picture.motion_val[1][xy][0] =
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s->current_picture.motion_val[1][xy][1] = 0;
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return;
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}
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s->mv[0][0][0] = scale_mv(s->next_picture.motion_val[1][xy][0], v->bfraction, 1, s->quarter_sample);
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s->mv[0][0][1] = scale_mv(s->next_picture.motion_val[1][xy][1], v->bfraction, 1, s->quarter_sample);
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s->mv[1][0][0] = scale_mv(s->next_picture.motion_val[1][xy][0], v->bfraction, 0, s->quarter_sample);
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s->mv[1][0][1] = scale_mv(s->next_picture.motion_val[1][xy][1], v->bfraction, 0, s->quarter_sample);
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if(direct) {
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for(i = 0; i < 4; i++) {
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mx[i] = s->last_picture.motion_val[0][s->block_index[i]][0];
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my[i] = s->last_picture.motion_val[0][s->block_index[i]][1];
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}
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mv_x = median4(mx[0], mx[1], mx[2], mx[3]);
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mv_y = median4(my[0], my[1], my[2], my[3]);
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s->mv[0][0][0] = (mv_x * v->bfraction + B_FRACTION_DEN/2) / B_FRACTION_DEN;
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s->mv[0][0][1] = (mv_y * v->bfraction + B_FRACTION_DEN/2) / B_FRACTION_DEN;
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vc1_mc_1mv(v, 0);
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for(i = 0; i < 4; i++) {
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mx[i] = s->next_picture.motion_val[0][s->block_index[i]][0];
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my[i] = s->next_picture.motion_val[0][s->block_index[i]][1];
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}
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mv_x = median4(mx[0], mx[1], mx[2], mx[3]);
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mv_y = median4(my[0], my[1], my[2], my[3]);
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s->mv[1][0][0] = (mv_x * (B_FRACTION_DEN - v->bfraction) + B_FRACTION_DEN/2) / B_FRACTION_DEN;
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s->mv[1][0][1] = (mv_y * (B_FRACTION_DEN - v->bfraction) + B_FRACTION_DEN/2) / B_FRACTION_DEN;
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vc1_interp_mc(v);
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return;
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}
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if(mode == BMV_TYPE_INTERPOLATED) {
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s->mv[0][0][0] = dmv_x[0];
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s->mv[0][0][1] = dmv_y[0];
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vc1_mc_1mv(v, 0);
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s->mv[1][0][0] = dmv_x[1];
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s->mv[1][0][1] = dmv_y[1];
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vc1_interp_mc(v);
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s->current_picture.motion_val[0][xy][0] = s->mv[0][0][0];
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s->current_picture.motion_val[0][xy][1] = s->mv[0][0][1];
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s->current_picture.motion_val[1][xy][0] = s->mv[1][0][0];
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s->current_picture.motion_val[1][xy][1] = s->mv[1][0][1];
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return;
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}
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if(mode == BMV_TYPE_BACKWARD) {
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for(i = 0; i < 4; i++) {
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mx[i] = s->last_picture.motion_val[0][s->block_index[i]][0];
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my[i] = s->last_picture.motion_val[0][s->block_index[i]][1];
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if((mvtype == BMV_TYPE_BACKWARD) || (mvtype == BMV_TYPE_INTERPOLATED)) {
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C = s->current_picture.motion_val[0][xy - 2];
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A = s->current_picture.motion_val[0][xy - wrap*2];
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off = (s->mb_x == (s->mb_width - 1)) ? -2 : 2;
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B = s->current_picture.motion_val[0][xy - wrap*2 + off];
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if(!s->first_slice_line) { // predictor A is not out of bounds
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if(s->mb_width == 1) {
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px = A[0];
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py = A[1];
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} else {
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px = mid_pred(A[0], B[0], C[0]);
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py = mid_pred(A[1], B[1], C[1]);
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}
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} else if(s->mb_x) { // predictor C is not out of bounds
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px = C[0];
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py = C[1];
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} else {
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px = py = 0;
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}
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} else {
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for(i = 0; i < 4; i++) {
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mx[i] = s->next_picture.motion_val[0][s->block_index[i]][0];
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my[i] = s->next_picture.motion_val[0][s->block_index[i]][1];
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/* Pullback MV as specified in 8.3.5.3.4 */
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{
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int qx, qy, X, Y;
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if(v->profile < PROFILE_ADVANCED) {
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qx = (s->mb_x << 5);
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qy = (s->mb_y << 5);
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X = (s->mb_width << 5) - 4;
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Y = (s->mb_height << 5) - 4;
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if(qx + px < -28) px = -28 - qx;
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if(qy + py < -28) py = -28 - qy;
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if(qx + px > X) px = X - qx;
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if(qy + py > Y) py = Y - qy;
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} else {
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qx = (s->mb_x << 6);
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qy = (s->mb_y << 6);
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X = (s->mb_width << 6) - 4;
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Y = (s->mb_height << 6) - 4;
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if(qx + px < -60) px = -60 - qx;
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if(qy + py < -60) py = -60 - qy;
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if(qx + px > X) px = X - qx;
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if(qy + py > Y) py = Y - qy;
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}
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}
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/* Calculate hybrid prediction as specified in 8.3.5.3.5 */
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if(0 && !s->first_slice_line && s->mb_x) {
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if(is_intra[xy - wrap])
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sum = ABS(px) + ABS(py);
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else
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sum = ABS(px - A[0]) + ABS(py - A[1]);
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if(sum > 32) {
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if(get_bits1(&s->gb)) {
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px = A[0];
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py = A[1];
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} else {
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px = C[0];
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py = C[1];
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}
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} else {
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if(is_intra[xy - 2])
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sum = ABS(px) + ABS(py);
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else
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sum = ABS(px - C[0]) + ABS(py - C[1]);
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if(sum > 32) {
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if(get_bits1(&s->gb)) {
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px = A[0];
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py = A[1];
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} else {
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px = C[0];
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py = C[1];
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}
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}
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}
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}
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/* store MV using signed modulus of MV range defined in 4.11 */
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s->mv[0][0][0] = ((px + dmv_x[0] + r_x) & ((r_x << 1) - 1)) - r_x;
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s->mv[0][0][1] = ((py + dmv_y[0] + r_y) & ((r_y << 1) - 1)) - r_y;
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}
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if((mvtype == BMV_TYPE_FORWARD) || (mvtype == BMV_TYPE_INTERPOLATED)) {
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C = s->current_picture.motion_val[1][xy - 2];
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A = s->current_picture.motion_val[1][xy - wrap*2];
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off = (s->mb_x == (s->mb_width - 1)) ? -2 : 2;
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B = s->current_picture.motion_val[1][xy - wrap*2 + off];
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/* XXX: not right but how to determine 4-MV intra/inter in another frame? */
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mv_x = median4(mx[0], mx[1], mx[2], mx[3]);
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mv_y = median4(my[0], my[1], my[2], my[3]);
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s->mv[0][0][0] = mv_x;
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s->mv[0][0][1] = mv_y;
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if(!s->first_slice_line) { // predictor A is not out of bounds
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if(s->mb_width == 1) {
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px = A[0];
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py = A[1];
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} else {
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px = mid_pred(A[0], B[0], C[0]);
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py = mid_pred(A[1], B[1], C[1]);
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}
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} else if(s->mb_x) { // predictor C is not out of bounds
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px = C[0];
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py = C[1];
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} else {
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px = py = 0;
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}
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/* Pullback MV as specified in 8.3.5.3.4 */
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{
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int qx, qy, X, Y;
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if(v->profile < PROFILE_ADVANCED) {
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qx = (s->mb_x << 5);
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qy = (s->mb_y << 5);
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X = (s->mb_width << 5) - 4;
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Y = (s->mb_height << 5) - 4;
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if(qx + px < -28) px = -28 - qx;
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if(qy + py < -28) py = -28 - qy;
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if(qx + px > X) px = X - qx;
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if(qy + py > Y) py = Y - qy;
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} else {
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qx = (s->mb_x << 6);
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qy = (s->mb_y << 6);
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X = (s->mb_width << 6) - 4;
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Y = (s->mb_height << 6) - 4;
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if(qx + px < -60) px = -60 - qx;
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if(qy + py < -60) py = -60 - qy;
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if(qx + px > X) px = X - qx;
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if(qy + py > Y) py = Y - qy;
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}
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}
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/* Calculate hybrid prediction as specified in 8.3.5.3.5 */
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if(0 && !s->first_slice_line && s->mb_x) {
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if(is_intra[xy - wrap])
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sum = ABS(px) + ABS(py);
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else
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sum = ABS(px - A[0]) + ABS(py - A[1]);
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if(sum > 32) {
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if(get_bits1(&s->gb)) {
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px = A[0];
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py = A[1];
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} else {
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px = C[0];
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py = C[1];
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}
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} else {
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if(is_intra[xy - 2])
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sum = ABS(px) + ABS(py);
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else
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sum = ABS(px - C[0]) + ABS(py - C[1]);
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if(sum > 32) {
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if(get_bits1(&s->gb)) {
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px = A[0];
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py = A[1];
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} else {
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px = C[0];
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py = C[1];
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}
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}
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}
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}
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/* store MV using signed modulus of MV range defined in 4.11 */
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vc1_mc_1mv(v, (mode == BMV_TYPE_FORWARD));
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s->mv[1][0][0] = ((px + dmv_x[1] + r_x) & ((r_x << 1) - 1)) - r_x;
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s->mv[1][0][1] = ((py + dmv_y[1] + r_y) & ((r_y << 1) - 1)) - r_y;
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}
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s->current_picture.motion_val[0][xy][0] = s->mv[0][0][0];
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s->current_picture.motion_val[0][xy][1] = s->mv[0][0][1];
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s->current_picture.motion_val[1][xy][0] = s->mv[1][0][0];
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s->current_picture.motion_val[1][xy][1] = s->mv[1][0][1];
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}
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/** Get predicted DC value for I-frames only
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@ -3101,6 +3286,10 @@ static int vc1_decode_p_mb(VC1Context *v)
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{
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GET_MVDATA(dmv_x, dmv_y);
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if (s->mb_intra) {
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s->current_picture.motion_val[1][s->block_index[0]][0] = 0;
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s->current_picture.motion_val[1][s->block_index[0]][1] = 0;
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}
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s->current_picture.mb_type[mb_pos] = s->mb_intra ? MB_TYPE_INTRA : MB_TYPE_16x16;
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vc1_pred_mv(s, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0]);
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@ -3354,10 +3543,16 @@ static void vc1_decode_b_mb(VC1Context *v)
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break;
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case 2:
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bmvtype = BMV_TYPE_INTERPOLATED;
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dmv_x[1] = dmv_y[1] = 0;
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}
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}
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}
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for(i = 0; i < 6; i++)
|
||||
v->mb_type[0][s->block_index[i]] = s->mb_intra;
|
||||
|
||||
if (skipped) {
|
||||
if(direct) bmvtype = BMV_TYPE_INTERPOLATED;
|
||||
vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);
|
||||
vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);
|
||||
return;
|
||||
}
|
||||
@ -3369,10 +3564,13 @@ static void vc1_decode_b_mb(VC1Context *v)
|
||||
s->current_picture.qscale_table[mb_pos] = mquant;
|
||||
if(!v->ttmbf)
|
||||
ttmb = get_vlc2(gb, vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);
|
||||
dmv_x[0] = dmv_y[0] = dmv_x[1] = dmv_y[1] = 0;
|
||||
vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);
|
||||
vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);
|
||||
} else {
|
||||
if(!mb_has_coeffs && !s->mb_intra) {
|
||||
/* no coded blocks - effectively skipped */
|
||||
vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);
|
||||
vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);
|
||||
return;
|
||||
}
|
||||
@ -3381,17 +3579,21 @@ static void vc1_decode_b_mb(VC1Context *v)
|
||||
s->current_picture.qscale_table[mb_pos] = mquant;
|
||||
s->ac_pred = get_bits1(gb);
|
||||
cbp = 0;
|
||||
vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);
|
||||
} else {
|
||||
if(bmvtype == BMV_TYPE_INTERPOLATED) {
|
||||
GET_MVDATA(dmv_x[1], dmv_y[1]);
|
||||
if(!mb_has_coeffs) {
|
||||
/* interpolated skipped block */
|
||||
vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);
|
||||
vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);
|
||||
return;
|
||||
}
|
||||
}
|
||||
if(!s->mb_intra)
|
||||
vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);
|
||||
if(!s->mb_intra) {
|
||||
vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);
|
||||
}
|
||||
if(s->mb_intra)
|
||||
s->ac_pred = get_bits1(gb);
|
||||
cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);
|
||||
@ -3804,7 +4006,10 @@ static void vc1_decode_blocks(VC1Context *v)
|
||||
vc1_decode_p_blocks(v);
|
||||
break;
|
||||
case B_TYPE:
|
||||
vc1_decode_b_blocks(v);
|
||||
if(v->bi_type)
|
||||
vc1_decode_i_blocks(v);
|
||||
else
|
||||
vc1_decode_b_blocks(v);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
@ -6,6 +6,7 @@
|
||||
#ifndef VC1DATA_H
|
||||
#define VC1DATA_H
|
||||
|
||||
#if 0 //original bfraction from vc9data.h, not conforming to standard
|
||||
/* Denominator used for vc1_bfraction_lut */
|
||||
#define B_FRACTION_DEN 840
|
||||
|
||||
@ -19,6 +20,22 @@ const int16_t vc1_bfraction_lut[23] = {
|
||||
525 /*5/8*/, 735 /*7/8*/,
|
||||
-1 /*inv.*/, 0 /*BI fm*/
|
||||
};
|
||||
#else
|
||||
/* Denominator used for vc1_bfraction_lut */
|
||||
#define B_FRACTION_DEN 256
|
||||
|
||||
/* pre-computed scales for all bfractions and base=256 */
|
||||
const int16_t vc1_bfraction_lut[23] = {
|
||||
128 /*1/2*/, 85 /*1/3*/, 170 /*2/3*/, 64 /*1/4*/,
|
||||
192 /*3/4*/, 51 /*1/5*/, 102 /*2/5*/,
|
||||
153 /*3/5*/, 204 /*4/5*/, 43 /*1/6*/, 215 /*5/6*/,
|
||||
37 /*1/7*/, 74 /*2/7*/, 111 /*3/7*/, 148 /*4/7*/,
|
||||
185 /*5/7*/, 222 /*6/7*/, 32 /*1/8*/, 96 /*3/8*/,
|
||||
160 /*5/8*/, 224 /*7/8*/,
|
||||
-1 /*inv.*/, 0 /*BI fm*/
|
||||
};
|
||||
#endif
|
||||
|
||||
const uint8_t vc1_bfraction_bits[23] = {
|
||||
3, 3, 3, 3,
|
||||
3, 3, 3,
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user