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Some B-frames support (parsing and decoding only, no motion compesation is done)

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Originally committed as revision 5820 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Kostya Shishkov 2006-07-24 04:24:53 +00:00
parent c39e3c6fbb
commit 5df6889364
2 changed files with 296 additions and 8 deletions
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301
libavcodec/vc1.c
View File

@ -316,8 +316,9 @@ typedef struct VC1Context{
VLC *cbpcy_vlc; ///< CBPCY VLC table
int tt_index; ///< Index for Transform Type tables
uint8_t* mv_type_mb_plane; ///< bitplane for mv_type == (4MV)
// BitPlane direct_mb_plane; ///< bitplane for "direct" MBs
uint8_t* direct_mb_plane; ///< bitplane for "direct" MBs
int mv_type_is_raw; ///< mv type mb plane is not coded
int dmb_is_raw; ///< direct mb plane is raw
int skip_is_raw; ///< skip mb plane is not coded
uint8_t luty[256], lutuv[256]; // lookup tables used for intensity compensation
int rnd; ///< rounding control
@ -897,7 +898,7 @@ static void vc1_put_block(VC1Context *v, DCTELEM block[6][64])
/** Do motion compensation over 1 macroblock
* Mostly adapted hpel_motion and qpel_motion from mpegvideo.c
*/
static void vc1_mc_1mv(VC1Context *v)
static void vc1_mc_1mv(VC1Context *v, int dir)
{
MpegEncContext *s = &v->s;
DSPContext *dsp = &v->s.dsp;
@ -910,9 +911,15 @@ static void vc1_mc_1mv(VC1Context *v)
my = s->mv[0][0][1];
uvmx = (mx + ((mx & 3) == 3)) >> 1;
uvmy = (my + ((my & 3) == 3)) >> 1;
srcY = s->last_picture.data[0];
srcU = s->last_picture.data[1];
srcV = s->last_picture.data[2];
if(!dir) {
srcY = s->last_picture.data[0];
srcU = s->last_picture.data[1];
srcV = s->last_picture.data[2];
} else {
srcY = s->next_picture.data[0];
srcU = s->next_picture.data[1];
srcV = s->next_picture.data[2];
}
src_x = s->mb_x * 16 + (mx >> 2);
src_y = s->mb_y * 16 + (my >> 2);
@ -1312,6 +1319,13 @@ static int vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)
if(v->s.pict_type == I_TYPE)
get_bits(gb, 7); // skip buffer fullness
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) {
v->s.pict_type = BI_TYPE;
}
}
/* calculate RND */
if(v->s.pict_type == I_TYPE)
@ -1436,6 +1450,44 @@ static int vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)
}
break;
case B_TYPE:
if (v->pq < 5) v->tt_index = 0;
else if(v->pq < 13) v->tt_index = 1;
else v->tt_index = 2;
lowquant = (v->pq > 12) ? 0 : 1;
v->mv_mode = get_bits1(gb) ? MV_PMODE_1MV : MV_PMODE_1MV_HPEL_BILIN;
v->s.quarter_sample = (v->mv_mode == MV_PMODE_1MV);
status = bitplane_decoding(v->direct_mb_plane, &v->dmb_is_raw, v);
if (status < 0) return -1;
av_log(v->s.avctx, AV_LOG_DEBUG, "MB Direct Type plane encoding: "
"Imode: %i, Invert: %i\n", status>>1, status&1);
status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);
if (status < 0) return -1;
av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "
"Imode: %i, Invert: %i\n", status>>1, status&1);
v->s.mv_table_index = get_bits(gb, 2);
v->cbpcy_vlc = &vc1_cbpcy_p_vlc[get_bits(gb, 2)];
if (v->dquant)
{
av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");
vop_dquant_decoding(v);
}
v->ttfrm = 0;
if (v->vstransform)
{
v->ttmbf = get_bits(gb, 1);
if (v->ttmbf)
{
v->ttfrm = ttfrm_to_tt[get_bits(gb, 2)];
}
} else {
v->ttmbf = 1;
v->ttfrm = TT_8X8;
}
break;
}
@ -1675,6 +1727,46 @@ static inline void vc1_pred_mv(MpegEncContext *s, int n, int dmv_x, int dmv_y, i
}
}
/** 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)
{
MpegEncContext *s = &v->s;
int mx[4], my[4], mv_x, mv_y;
int i;
/* 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 || mode == BMV_TYPE_INTERPOLATED) {
/* TODO */
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];
}
} 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];
}
}
/* 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;
vc1_mc_1mv(v, (mode == BMV_TYPE_FORWARD));
}
/** Get predicted DC value for I-frames only
* prediction dir: left=0, top=1
* @param s MpegEncContext
@ -2455,7 +2547,7 @@ static int vc1_decode_p_mb(VC1Context *v)
if (!v->ttmbf && !s->mb_intra && mb_has_coeffs)
ttmb = get_vlc2(gb, vc1_ttmb_vlc[v->tt_index].table,
VC1_TTMB_VLC_BITS, 2);
if(!s->mb_intra) vc1_mc_1mv(v);
if(!s->mb_intra) vc1_mc_1mv(v, 0);
dst_idx = 0;
for (i=0; i<6; i++)
{
@ -2501,7 +2593,7 @@ static int vc1_decode_p_mb(VC1Context *v)
s->current_picture.mb_type[mb_pos] = MB_TYPE_SKIP;
s->current_picture.qscale_table[mb_pos] = 0;
vc1_pred_mv(s, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0]);
vc1_mc_1mv(v);
vc1_mc_1mv(v, 0);
return 0;
}
} //1MV mode
@ -2616,6 +2708,146 @@ static int vc1_decode_p_mb(VC1Context *v)
return -1;
}
/** Decode one B-frame MB (in Main profile)
*/
static void vc1_decode_b_mb(VC1Context *v)
{
MpegEncContext *s = &v->s;
GetBitContext *gb = &s->gb;
int i, j;
int mb_pos = s->mb_x + s->mb_y * s->mb_stride;
int cbp; /* cbp decoding stuff */
int mqdiff, mquant; /* MB quantization */
int ttmb = v->ttfrm; /* MB Transform type */
static const int size_table[6] = { 0, 2, 3, 4, 5, 8 },
offset_table[6] = { 0, 1, 3, 7, 15, 31 };
int mb_has_coeffs = 0; /* last_flag */
int index, index1; /* LUT indices */
int val, sign; /* temp values */
int first_block = 1;
int dst_idx, off;
int skipped, direct;
int dmv_x[2], dmv_y[2];
int bmvtype = BMV_TYPE_BACKWARD; /* XXX: is it so? */
mquant = v->pq; /* Loosy initialization */
s->mb_intra = 0;
if (v->dmb_is_raw)
direct = get_bits1(gb);
else
direct = v->direct_mb_plane[mb_pos];
if (v->skip_is_raw)
skipped = get_bits1(gb);
else
skipped = v->s.mbskip_table[mb_pos];
s->dsp.clear_blocks(s->block[0]);
dmv_x[0] = dmv_x[1] = dmv_y[0] = dmv_y[1] = 0;
for(i = 0; i < 6; i++) {
v->mb_type[0][s->block_index[i]] = 0;
s->dc_val[0][s->block_index[i]] = 0;
}
s->current_picture.qscale_table[mb_pos] = 0;
if (!direct) {
if (!skipped) {
GET_MVDATA(dmv_x[0], dmv_y[0]);
}
if(skipped || !s->mb_intra) {
bmvtype = decode012(gb);
switch(bmvtype) {
case 0:
bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_BACKWARD : BMV_TYPE_FORWARD;
break;
case 1:
bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_FORWARD : BMV_TYPE_BACKWARD;
break;
case 2:
bmvtype = BMV_TYPE_INTERPOLATED;
}
}
}
if (skipped) {
vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);
return;
}
if (direct) {
cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);
GET_MQUANT();
s->current_picture.qscale_table[mb_pos] = mquant;
if(!v->ttmbf && !s->mb_intra && mb_has_coeffs)
ttmb = get_vlc2(gb, vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);
vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);
} else {
if(!mb_has_coeffs && !s->mb_intra) {
/* no coded blocks - effectively skipped */
vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);
return;
}
if(s->mb_intra && !mb_has_coeffs) {
GET_MQUANT();
s->current_picture.qscale_table[mb_pos] = mquant;
s->ac_pred = get_bits1(gb);
cbp = 0;
} else {
if(bmvtype == BMV_TYPE_INTERPOLATED) {
GET_MVDATA(dmv_x[1], dmv_y[1]);
if(!mb_has_coeffs) {
/* interpolated skipped block */
vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);
return;
}
}
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);
GET_MQUANT();
s->current_picture.qscale_table[mb_pos] = mquant;
if(!v->ttmbf && !s->mb_intra && mb_has_coeffs)
ttmb = get_vlc2(gb, vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);
}
}
dst_idx = 0;
for (i=0; i<6; i++)
{
s->dc_val[0][s->block_index[i]] = 0;
dst_idx += i >> 2;
val = ((cbp >> (5 - i)) & 1);
off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);
v->mb_type[0][s->block_index[i]] = s->mb_intra;
if(s->mb_intra) {
/* check if prediction blocks A and C are available */
v->a_avail = v->c_avail = 0;
if(i == 2 || i == 3 || !s->first_slice_line)
v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];
if(i == 1 || i == 3 || s->mb_x)
v->c_avail = v->mb_type[0][s->block_index[i] - 1];
vc1_decode_intra_block(v, s->block[i], i, val, mquant, (i&4)?v->codingset2:v->codingset);
vc1_inv_trans(s->block[i], 8, 8);
for(j = 0; j < 64; j++) s->block[i][j] += 128;
s->dsp.put_pixels_clamped(s->block[i], s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));
/* TODO: proper loop filtering */
if(v->pq >= 9 && v->overlap) {
if(v->a_avail)
vc1_v_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));
if(v->c_avail)
vc1_h_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));
}
} else if(val) {
vc1_decode_p_block(v, s->block[i], i, mquant, ttmb, first_block);
if(!v->ttmbf && ttmb < 8) ttmb = -1;
first_block = 0;
s->dsp.add_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);
}
}
}
/** Decode blocks of I-frame
*/
static void vc1_decode_i_blocks(VC1Context *v)
@ -2769,6 +3001,54 @@ static void vc1_decode_p_blocks(VC1Context *v)
}
}
static void vc1_decode_b_blocks(VC1Context *v)
{
MpegEncContext *s = &v->s;
/* select codingmode used for VLC tables selection */
switch(v->c_ac_table_index){
case 0:
v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;
break;
case 1:
v->codingset = CS_HIGH_MOT_INTRA;
break;
case 2:
v->codingset = CS_MID_RATE_INTRA;
break;
}
switch(v->c_ac_table_index){
case 0:
v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;
break;
case 1:
v->codingset2 = CS_HIGH_MOT_INTER;
break;
case 2:
v->codingset2 = CS_MID_RATE_INTER;
break;
}
ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));
s->first_slice_line = 1;
for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {
for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {
ff_init_block_index(s);
ff_update_block_index(s);
s->dsp.clear_blocks(s->block[0]);
vc1_decode_b_mb(v);
if(get_bits_count(&s->gb) > v->bits || get_bits_count(&s->gb) < 0) {
av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i at %ix%i\n", get_bits_count(&s->gb), v->bits,s->mb_x,s->mb_y);
return;
}
}
ff_draw_horiz_band(s, s->mb_y * 16, 16);
s->first_slice_line = 0;
}
}
static void vc1_decode_blocks(VC1Context *v)
{
@ -2781,6 +3061,9 @@ static void vc1_decode_blocks(VC1Context *v)
case P_TYPE:
vc1_decode_p_blocks(v);
break;
case B_TYPE:
vc1_decode_b_blocks(v);
break;
}
}
@ -2839,6 +3122,7 @@ static int vc1_decode_init(AVCodecContext *avctx)
/* Allocate mb bitplanes */
v->mv_type_mb_plane = av_malloc(s->mb_stride * s->mb_height);
v->direct_mb_plane = av_malloc(s->mb_stride * s->mb_height);
/* allocate block type info in that way so it could be used with s->block_index[] */
v->mb_type_base = av_malloc(s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride * (s->mb_height + 1) * 2);
@ -2897,7 +3181,7 @@ static int vc1_decode_frame(AVCodecContext *avctx,
if(vc1_parse_frame_header(v, &s->gb) == -1)
return -1;
if(s->pict_type != I_TYPE && s->pict_type != P_TYPE)return -1;
// if(s->pict_type != I_TYPE && s->pict_type != P_TYPE)return -1;
// for hurry_up==5
s->current_picture.pict_type= s->pict_type;
@ -2967,6 +3251,7 @@ static int vc1_decode_end(AVCodecContext *avctx)
av_freep(&v->hrd_buffer);
MPV_common_end(&v->s);
av_freep(&v->mv_type_mb_plane);
av_freep(&v->direct_mb_plane);
av_freep(&v->mb_type_base);
return 0;
}

3
libavcodec/vc1data.h
View File

@ -6,6 +6,9 @@
#ifndef VC1DATA_H
#define VC1DATA_H
/* Denominator used for vc1_bfraction_lut */
#define B_FRACTION_DEN 840
/* bfraction is fractional, we scale to the GCD 3*5*7*8 = 840 */
const int16_t vc1_bfraction_lut[23] = {
420 /*1/2*/, 280 /*1/3*/, 560 /*2/3*/, 210 /*1/4*/,