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Proper support for B/BI frames

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Originally committed as revision 6207 to svn://svn.ffmpeg.org/ffmpeg/trunk
pull/126/head
Kostya Shishkov 19 years ago
parent 0288a7474b
commit 1dc1ce643e
2 changed files with 274 additions and 52 deletions
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  1. 309
      libavcodec/vc1.c
  2. 17
      libavcodec/vc1data.h

309
libavcodec/vc1.c
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@ -369,6 +369,7 @@ typedef struct VC1Context{
//@}
int p_frame_skipped;
int bi_type;
} VC1Context;
/**
@ -778,8 +779,14 @@ static void vc1_mc_1mv(VC1Context *v, int dir)
if(!v->s.last_picture.data[0])return;
mx = s->mv[0][0][0];
my = s->mv[0][0][1];
mx = s->mv[dir][0][0];
my = s->mv[dir][0][1];
// store motion vectors for further use in B frames
if(s->pict_type == P_TYPE) {
s->current_picture.motion_val[1][s->block_index[0]][0] = mx;
s->current_picture.motion_val[1][s->block_index[0]][1] = my;
}
uvmx = (mx + ((mx & 3) == 3)) >> 1;
uvmy = (my + ((my & 3) == 3)) >> 1;
if(!dir) {
@ -1040,6 +1047,8 @@ static void vc1_mc_4mv_chroma(VC1Context *v)
} else
return; //no need to do MC for inter blocks
s->current_picture.motion_val[1][s->block_index[0]][0] = tx;
s->current_picture.motion_val[1][s->block_index[0]][1] = ty;
uvmx = (tx + ((tx&3) == 3)) >> 1;
uvmy = (ty + ((ty&3) == 3)) >> 1;
@ -1383,18 +1392,19 @@ static int vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)
} else v->s.pict_type = P_TYPE;
} else v->s.pict_type = v->s.pict_type ? P_TYPE : I_TYPE;
if(v->s.pict_type == I_TYPE)
get_bits(gb, 7); // skip buffer fullness
v->bi_type = 0;
if(v->s.pict_type == B_TYPE) {
v->bfraction = get_vlc2(gb, vc1_bfraction_vlc.table, VC1_BFRACTION_VLC_BITS, 1);
v->bfraction = vc1_bfraction_lut[v->bfraction];
if(v->bfraction == -1) {
if(v->bfraction == 0) {
v->s.pict_type = BI_TYPE;
}
}
if(v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)
get_bits(gb, 7); // skip buffer fullness
/* calculate RND */
if(v->s.pict_type == I_TYPE)
if(v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)
v->rnd = 1;
if(v->s.pict_type == P_TYPE)
v->rnd ^= 1;
@ -1568,6 +1578,10 @@ static int vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)
/* DC Syntax */
v->s.dc_table_index = get_bits(gb, 1);
if(v->s.pict_type == BI_TYPE) {
v->s.pict_type = B_TYPE;
v->bi_type = 1;
}
return 0;
}
@ -2078,71 +2092,242 @@ static void vc1_interp_mc(VC1Context *v)
dsp->avg_qpel_pixels_tab[1][uvdxy](s->dest[2], srcV, s->uvlinesize);
}
static always_inline int scale_mv(int value, int bfrac, int inv, int qs)
{
int n = bfrac;
#if B_FRACTION_DEN==256
if(inv)
n -= 256;
if(!qs)
return 2 * ((value * n + 255) >> 9);
return (value * n + 128) >> 8;
#else
if(inv)
n -= B_FRACTION_DEN;
if(!qs)
return 2 * ((value * n + B_FRACTION_DEN - 1) / (2 * B_FRACTION_DEN));
return (value * n + B_FRACTION_DEN/2) / B_FRACTION_DEN;
#endif
}
/** Reconstruct motion vector for B-frame and do motion compensation
*/
static inline void vc1_b_mc(VC1Context *v, int dmv_x[2], int dmv_y[2], int direct, int mode)
{
if(direct) {
vc1_mc_1mv(v, 0);
vc1_interp_mc(v);
return;
}
if(mode == BMV_TYPE_INTERPOLATED) {
vc1_mc_1mv(v, 0);
vc1_interp_mc(v);
return;
}
vc1_mc_1mv(v, (mode == BMV_TYPE_FORWARD));
}
static inline void vc1_pred_b_mv(VC1Context *v, int dmv_x[2], int dmv_y[2], int direct, int mvtype)
{
MpegEncContext *s = &v->s;
int mx[4], my[4], mv_x, mv_y;
int i;
int xy, wrap, off = 0;
int16_t *A, *B, *C;
int px, py;
int sum;
int r_x, r_y;
const uint8_t *is_intra = v->mb_type[0];
r_x = v->range_x;
r_y = v->range_y;
/* scale MV difference to be quad-pel */
dmv_x[0] <<= 1 - s->quarter_sample;
dmv_y[0] <<= 1 - s->quarter_sample;
dmv_x[1] <<= 1 - s->quarter_sample;
dmv_y[1] <<= 1 - s->quarter_sample;
if(direct) {
for(i = 0; i < 4; i++) {
mx[i] = s->last_picture.motion_val[0][s->block_index[i]][0];
my[i] = s->last_picture.motion_val[0][s->block_index[i]][1];
}
mv_x = median4(mx[0], mx[1], mx[2], mx[3]);
mv_y = median4(my[0], my[1], my[2], my[3]);
s->mv[0][0][0] = (mv_x * v->bfraction + B_FRACTION_DEN/2) / B_FRACTION_DEN;
s->mv[0][0][1] = (mv_y * v->bfraction + B_FRACTION_DEN/2) / B_FRACTION_DEN;
vc1_mc_1mv(v, 0);
wrap = s->b8_stride;
xy = s->block_index[0];
for(i = 0; i < 4; i++) {
mx[i] = s->next_picture.motion_val[0][s->block_index[i]][0];
my[i] = s->next_picture.motion_val[0][s->block_index[i]][1];
}
mv_x = median4(mx[0], mx[1], mx[2], mx[3]);
mv_y = median4(my[0], my[1], my[2], my[3]);
s->mv[1][0][0] = (mv_x * (B_FRACTION_DEN - v->bfraction) + B_FRACTION_DEN/2) / B_FRACTION_DEN;
s->mv[1][0][1] = (mv_y * (B_FRACTION_DEN - v->bfraction) + B_FRACTION_DEN/2) / B_FRACTION_DEN;
vc1_interp_mc(v);
if(s->mb_intra) {
s->current_picture.motion_val[0][xy][0] =
s->current_picture.motion_val[0][xy][1] =
s->current_picture.motion_val[1][xy][0] =
s->current_picture.motion_val[1][xy][1] = 0;
return;
}
if(mode == BMV_TYPE_INTERPOLATED) {
s->mv[0][0][0] = dmv_x[0];
s->mv[0][0][1] = dmv_y[0];
vc1_mc_1mv(v, 0);
s->mv[1][0][0] = dmv_x[1];
s->mv[1][0][1] = dmv_y[1];
vc1_interp_mc(v);
s->mv[0][0][0] = scale_mv(s->next_picture.motion_val[1][xy][0], v->bfraction, 1, s->quarter_sample);
s->mv[0][0][1] = scale_mv(s->next_picture.motion_val[1][xy][1], v->bfraction, 1, s->quarter_sample);
s->mv[1][0][0] = scale_mv(s->next_picture.motion_val[1][xy][0], v->bfraction, 0, s->quarter_sample);
s->mv[1][0][1] = scale_mv(s->next_picture.motion_val[1][xy][1], v->bfraction, 0, s->quarter_sample);
if(direct) {
s->current_picture.motion_val[0][xy][0] = s->mv[0][0][0];
s->current_picture.motion_val[0][xy][1] = s->mv[0][0][1];
s->current_picture.motion_val[1][xy][0] = s->mv[1][0][0];
s->current_picture.motion_val[1][xy][1] = s->mv[1][0][1];
return;
}
if(mode == BMV_TYPE_BACKWARD) {
for(i = 0; i < 4; i++) {
mx[i] = s->last_picture.motion_val[0][s->block_index[i]][0];
my[i] = s->last_picture.motion_val[0][s->block_index[i]][1];
if((mvtype == BMV_TYPE_BACKWARD) || (mvtype == BMV_TYPE_INTERPOLATED)) {
C = s->current_picture.motion_val[0][xy - 2];
A = s->current_picture.motion_val[0][xy - wrap*2];
off = (s->mb_x == (s->mb_width - 1)) ? -2 : 2;
B = s->current_picture.motion_val[0][xy - wrap*2 + off];
if(!s->first_slice_line) { // predictor A is not out of bounds
if(s->mb_width == 1) {
px = A[0];
py = A[1];
} else {
px = mid_pred(A[0], B[0], C[0]);
py = mid_pred(A[1], B[1], C[1]);
}
} else if(s->mb_x) { // predictor C is not out of bounds
px = C[0];
py = C[1];
} else {
px = py = 0;
}
} else {
for(i = 0; i < 4; i++) {
mx[i] = s->next_picture.motion_val[0][s->block_index[i]][0];
my[i] = s->next_picture.motion_val[0][s->block_index[i]][1];
/* Pullback MV as specified in 8.3.5.3.4 */
{
int qx, qy, X, Y;
if(v->profile < PROFILE_ADVANCED) {
qx = (s->mb_x << 5);
qy = (s->mb_y << 5);
X = (s->mb_width << 5) - 4;
Y = (s->mb_height << 5) - 4;
if(qx + px < -28) px = -28 - qx;
if(qy + py < -28) py = -28 - qy;
if(qx + px > X) px = X - qx;
if(qy + py > Y) py = Y - qy;
} else {
qx = (s->mb_x << 6);
qy = (s->mb_y << 6);
X = (s->mb_width << 6) - 4;
Y = (s->mb_height << 6) - 4;
if(qx + px < -60) px = -60 - qx;
if(qy + py < -60) py = -60 - qy;
if(qx + px > X) px = X - qx;
if(qy + py > Y) py = Y - qy;
}
}
}
/* XXX: not right but how to determine 4-MV intra/inter in another frame? */
mv_x = median4(mx[0], mx[1], mx[2], mx[3]);
mv_y = median4(my[0], my[1], my[2], my[3]);
s->mv[0][0][0] = mv_x;
s->mv[0][0][1] = mv_y;
/* Calculate hybrid prediction as specified in 8.3.5.3.5 */
if(0 && !s->first_slice_line && s->mb_x) {
if(is_intra[xy - wrap])
sum = ABS(px) + ABS(py);
else
sum = ABS(px - A[0]) + ABS(py - A[1]);
if(sum > 32) {
if(get_bits1(&s->gb)) {
px = A[0];
py = A[1];
} else {
px = C[0];
py = C[1];
}
} else {
if(is_intra[xy - 2])
sum = ABS(px) + ABS(py);
else
sum = ABS(px - C[0]) + ABS(py - C[1]);
if(sum > 32) {
if(get_bits1(&s->gb)) {
px = A[0];
py = A[1];
} else {
px = C[0];
py = C[1];
}
}
}
}
/* store MV using signed modulus of MV range defined in 4.11 */
s->mv[0][0][0] = ((px + dmv_x[0] + r_x) & ((r_x << 1) - 1)) - r_x;
s->mv[0][0][1] = ((py + dmv_y[0] + r_y) & ((r_y << 1) - 1)) - r_y;
}
if((mvtype == BMV_TYPE_FORWARD) || (mvtype == BMV_TYPE_INTERPOLATED)) {
C = s->current_picture.motion_val[1][xy - 2];
A = s->current_picture.motion_val[1][xy - wrap*2];
off = (s->mb_x == (s->mb_width - 1)) ? -2 : 2;
B = s->current_picture.motion_val[1][xy - wrap*2 + off];
if(!s->first_slice_line) { // predictor A is not out of bounds
if(s->mb_width == 1) {
px = A[0];
py = A[1];
} else {
px = mid_pred(A[0], B[0], C[0]);
py = mid_pred(A[1], B[1], C[1]);
}
} else if(s->mb_x) { // predictor C is not out of bounds
px = C[0];
py = C[1];
} else {
px = py = 0;
}
/* Pullback MV as specified in 8.3.5.3.4 */
{
int qx, qy, X, Y;
if(v->profile < PROFILE_ADVANCED) {
qx = (s->mb_x << 5);
qy = (s->mb_y << 5);
X = (s->mb_width << 5) - 4;
Y = (s->mb_height << 5) - 4;
if(qx + px < -28) px = -28 - qx;
if(qy + py < -28) py = -28 - qy;
if(qx + px > X) px = X - qx;
if(qy + py > Y) py = Y - qy;
} else {
qx = (s->mb_x << 6);
qy = (s->mb_y << 6);
X = (s->mb_width << 6) - 4;
Y = (s->mb_height << 6) - 4;
if(qx + px < -60) px = -60 - qx;
if(qy + py < -60) py = -60 - qy;
if(qx + px > X) px = X - qx;
if(qy + py > Y) py = Y - qy;
}
}
/* Calculate hybrid prediction as specified in 8.3.5.3.5 */
if(0 && !s->first_slice_line && s->mb_x) {
if(is_intra[xy - wrap])
sum = ABS(px) + ABS(py);
else
sum = ABS(px - A[0]) + ABS(py - A[1]);
if(sum > 32) {
if(get_bits1(&s->gb)) {
px = A[0];
py = A[1];
} else {
px = C[0];
py = C[1];
}
} else {
if(is_intra[xy - 2])
sum = ABS(px) + ABS(py);
else
sum = ABS(px - C[0]) + ABS(py - C[1]);
if(sum > 32) {
if(get_bits1(&s->gb)) {
px = A[0];
py = A[1];
} else {
px = C[0];
py = C[1];
}
}
}
}
/* store MV using signed modulus of MV range defined in 4.11 */
vc1_mc_1mv(v, (mode == BMV_TYPE_FORWARD));
s->mv[1][0][0] = ((px + dmv_x[1] + r_x) & ((r_x << 1) - 1)) - r_x;
s->mv[1][0][1] = ((py + dmv_y[1] + r_y) & ((r_y << 1) - 1)) - r_y;
}
s->current_picture.motion_val[0][xy][0] = s->mv[0][0][0];
s->current_picture.motion_val[0][xy][1] = s->mv[0][0][1];
s->current_picture.motion_val[1][xy][0] = s->mv[1][0][0];
s->current_picture.motion_val[1][xy][1] = s->mv[1][0][1];
}
/** Get predicted DC value for I-frames only
@ -3101,6 +3286,10 @@ static int vc1_decode_p_mb(VC1Context *v)
{
GET_MVDATA(dmv_x, dmv_y);
if (s->mb_intra) {
s->current_picture.motion_val[1][s->block_index[0]][0] = 0;
s->current_picture.motion_val[1][s->block_index[0]][1] = 0;
}
s->current_picture.mb_type[mb_pos] = s->mb_intra ? MB_TYPE_INTRA : MB_TYPE_16x16;
vc1_pred_mv(s, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0]);
@ -3354,10 +3543,16 @@ static void vc1_decode_b_mb(VC1Context *v)
break;
case 2:
bmvtype = BMV_TYPE_INTERPOLATED;
dmv_x[1] = dmv_y[1] = 0;
}
}
}
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;
}
}

17
libavcodec/vc1data.h
Unescape View File

@ -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,

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