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In-loop deblocking filter for VC-1 decoder 

Originally committed as revision 14344 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Kostya Shishkov 2008-07-23 06:21:27 +00:00
parent 144b46f21b
commit 00a750009f
2 changed files with 173 additions and 9 deletions
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180
libavcodec/vc1.c
View File

@ -306,6 +306,79 @@ static int bitplane_decoding(uint8_t* data, int *raw_flag, VC1Context *v)
/** @} */ //Bitplane group
#define FILTSIGN(a) ((a) >= 0 ? 1 : -1)
/**
* VC-1 in-loop deblocking filter for one line
* @param src source block type
* @param pq block quantizer
* @return whether other 3 pairs should be filtered or not
* @see 8.6
*/
static int vc1_filter_line(uint8_t* src, int stride, int pq){
int a0, a1, a2, a3, d, clip, filt3 = 0;
uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
a0 = (2*(src[-2*stride] - src[ 1*stride]) - 5*(src[-1*stride] - src[ 0*stride]) + 4) >> 3;
if(FFABS(a0) < pq){
a1 = (2*(src[-4*stride] - src[-1*stride]) - 5*(src[-3*stride] - src[-2*stride]) + 4) >> 3;
a2 = (2*(src[ 0*stride] - src[ 3*stride]) - 5*(src[ 1*stride] - src[ 2*stride]) + 4) >> 3;
a3 = FFMIN(FFABS(a1), FFABS(a2));
if(a3 < FFABS(a0)){
d = 5 * ((a0 >=0 ? a3 : -a3) - a0) / 8;
clip = (src[-1*stride] - src[ 0*stride])/2;
if(clip){
filt3 = 1;
if(clip > 0)
d = av_clip(d, 0, clip);
else
d = av_clip(d, clip, 0);
src[-1*stride] = cm[src[-1*stride] - d];
src[ 0*stride] = cm[src[ 0*stride] + d];
}
}
}
return filt3;
}
/**
* VC-1 in-loop deblocking filter
* @param src source block type
* @param len edge length to filter (4 or 8 pixels)
* @param pq block quantizer
* @see 8.6
*/
static void vc1_loop_filter(uint8_t* src, int step, int stride, int len, int pq)
{
int i;
int filt3;
for(i = 0; i < len; i += 4){
filt3 = vc1_filter_line(src + 2*step, stride, pq);
if(filt3){
vc1_filter_line(src + 0*step, stride, pq);
vc1_filter_line(src + 1*step, stride, pq);
vc1_filter_line(src + 3*step, stride, pq);
}
src += step * 4;
}
}
static void vc1_loop_filter_iblk(MpegEncContext *s, int pq)
{
int i, j;
if(!s->first_slice_line)
vc1_loop_filter(s->dest[0], 1, s->linesize, 16, pq);
vc1_loop_filter(s->dest[0] + 8*s->linesize, 1, s->linesize, 16, pq);
for(i = !s->mb_x*8; i < 16; i += 8)
vc1_loop_filter(s->dest[0] + i, s->linesize, 1, 16, pq);
for(j = 0; j < 2; j++){
if(!s->first_slice_line)
vc1_loop_filter(s->dest[j+1], 1, s->uvlinesize, 8, pq);
if(s->mb_x)
vc1_loop_filter(s->dest[j+1], s->uvlinesize, 1, 8, pq);
}
}
/***********************************************************************/
/** VOP Dquant decoding
* @param v VC-1 Context
@ -2887,7 +2960,7 @@ static int vc1_decode_intra_block(VC1Context *v, DCTELEM block[64], int n, int c
/** Decode P block
*/
static int vc1_decode_p_block(VC1Context *v, DCTELEM block[64], int n, int mquant, int ttmb, int first_block,
uint8_t *dst, int linesize, int skip_block)
uint8_t *dst, int linesize, int skip_block, int apply_filter, int cbp_top, int cbp_left)
{
MpegEncContext *s = &v->s;
GetBitContext *gb = &s->gb;
@ -2895,6 +2968,7 @@ static int vc1_decode_p_block(VC1Context *v, DCTELEM block[64], int n, int mquan
int subblkpat = 0;
int scale, off, idx, last, skip, value;
int ttblk = ttmb & 7;
int pat = 0;
if(ttmb == -1) {
ttblk = ff_vc1_ttblk_to_tt[v->tt_index][get_vlc2(gb, ff_vc1_ttblk_vlc[v->tt_index].table, VC1_TTBLK_VLC_BITS, 1)];
@ -2921,6 +2995,7 @@ static int vc1_decode_p_block(VC1Context *v, DCTELEM block[64], int n, int mquan
}
switch(ttblk) {
case TT_8X8:
pat = 0xF;
i = 0;
last = 0;
while (!last) {
@ -2936,9 +3011,14 @@ static int vc1_decode_p_block(VC1Context *v, DCTELEM block[64], int n, int mquan
if(!skip_block){
s->dsp.vc1_inv_trans_8x8(block);
s->dsp.add_pixels_clamped(block, dst, linesize);
if(apply_filter && cbp_top & 0xC)
vc1_loop_filter(dst, 1, linesize, 8, mquant);
if(apply_filter && cbp_left & 0xA)
vc1_loop_filter(dst, linesize, 1, 8, mquant);
}
break;
case TT_4X4:
pat = ~subblkpat & 0xF;
for(j = 0; j < 4; j++) {
last = subblkpat & (1 << (3 - j));
i = 0;
@ -2953,11 +3033,17 @@ static int vc1_decode_p_block(VC1Context *v, DCTELEM block[64], int n, int mquan
if(!v->pquantizer)
block[idx + off] += (block[idx + off] < 0) ? -mquant : mquant;
}
if(!(subblkpat & (1 << (3 - j))) && !skip_block)
if(!(subblkpat & (1 << (3 - j))) && !skip_block){
s->dsp.vc1_inv_trans_4x4(dst + (j&1)*4 + (j&2)*2*linesize, linesize, block + off);
if(apply_filter && (j&2 ? pat & (1<<(j-2)) : (cbp_top & (1 << (j + 2)))))
vc1_loop_filter(dst + (j&1)*4 + (j&2)*2*linesize, 1, linesize, 4, mquant);
if(apply_filter && (j&1 ? pat & (1<<(j-1)) : (cbp_left & (1 << (j + 1)))))
vc1_loop_filter(dst + (j&1)*4 + (j&2)*2*linesize, linesize, 1, 4, mquant);
}
}
break;
case TT_8X4:
pat = ~((subblkpat & 2)*6 + (subblkpat & 1)*3) & 0xF;
for(j = 0; j < 2; j++) {
last = subblkpat & (1 << (1 - j));
i = 0;
@ -2972,11 +3058,17 @@ static int vc1_decode_p_block(VC1Context *v, DCTELEM block[64], int n, int mquan
if(!v->pquantizer)
block[idx] += (block[idx] < 0) ? -mquant : mquant;
}
if(!(subblkpat & (1 << (1 - j))) && !skip_block)
if(!(subblkpat & (1 << (1 - j))) && !skip_block){
s->dsp.vc1_inv_trans_8x4(dst + j*4*linesize, linesize, block + off);
if(apply_filter && j ? pat & 0x3 : (cbp_top & 0xC))
vc1_loop_filter(dst + j*4*linesize, 1, linesize, 8, mquant);
if(apply_filter && cbp_left & (2 << j))
vc1_loop_filter(dst + j*4*linesize, linesize, 1, 4, mquant);
}
}
break;
case TT_4X8:
pat = ~(subblkpat*5) & 0xF;
for(j = 0; j < 2; j++) {
last = subblkpat & (1 << (1 - j));
i = 0;
@ -2991,12 +3083,17 @@ static int vc1_decode_p_block(VC1Context *v, DCTELEM block[64], int n, int mquan
if(!v->pquantizer)
block[idx] += (block[idx] < 0) ? -mquant : mquant;
}
if(!(subblkpat & (1 << (1 - j))) && !skip_block)
if(!(subblkpat & (1 << (1 - j))) && !skip_block){
s->dsp.vc1_inv_trans_4x8(dst + j*4, linesize, block + off);
if(apply_filter && cbp_top & (2 << j))
vc1_loop_filter(dst + j*4, 1, linesize, 4, mquant);
if(apply_filter && j ? pat & 0x5 : (cbp_left & 0xA))
vc1_loop_filter(dst + j*4, linesize, 1, 8, mquant);
}
}
break;
}
return 0;
return pat;
}
@ -3022,6 +3119,7 @@ static int vc1_decode_p_mb(VC1Context *v)
int first_block = 1;
int dst_idx, off;
int skipped, fourmv;
int block_cbp = 0, pat;
mquant = v->pq; /* Loosy initialization */
@ -3100,8 +3198,35 @@ static int vc1_decode_p_mb(VC1Context *v)
if(v->a_avail)
s->dsp.vc1_v_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));
}
if(v->s.loop_filter && s->mb_x && s->mb_x != (s->mb_width - 1) && s->mb_y && s->mb_y != (s->mb_height - 1)){
int left_cbp, top_cbp;
if(i & 4){
left_cbp = v->cbp[s->mb_x - 1] >> (i * 4);
top_cbp = v->cbp[s->mb_x - s->mb_stride] >> (i * 4);
}else{
left_cbp = (i & 1) ? (pat >> ((i-1)*4)) : (v->cbp[s->mb_x - 1] >> ((i+1)*4));
top_cbp = (i & 2) ? (pat >> ((i-2)*4)) : (v->cbp[s->mb_x - s->mb_stride] >> ((i+2)*4));
}
if(left_cbp & 0xC)
vc1_loop_filter(s->dest[dst_idx] + off, 1, i & 4 ? s->uvlinesize : s->linesize, 8, mquant);
if(top_cbp & 0xA)
vc1_loop_filter(s->dest[dst_idx] + off, i & 4 ? s->uvlinesize : s->linesize, 1, 8, mquant);
}
block_cbp |= 0xF << (i << 2);
} else if(val) {
vc1_decode_p_block(v, s->block[i], i, mquant, ttmb, first_block, s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize, (i&4) && (s->flags & CODEC_FLAG_GRAY));
int left_cbp = 0, top_cbp = 0, filter = 0;
if(v->s.loop_filter && s->mb_x && s->mb_x != (s->mb_width - 1) && s->mb_y && s->mb_y != (s->mb_height - 1)){
filter = 1;
if(i & 4){
left_cbp = v->cbp[s->mb_x - 1] >> (i * 4);
top_cbp = v->cbp[s->mb_x - s->mb_stride] >> (i * 4);
}else{
left_cbp = (i & 1) ? (pat >> ((i-1)*4)) : (v->cbp[s->mb_x - 1] >> ((i+1)*4));
top_cbp = (i & 2) ? (pat >> ((i-2)*4)) : (v->cbp[s->mb_x - s->mb_stride] >> ((i+2)*4));
}
}
pat = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb, first_block, s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize, (i&4) && (s->flags & CODEC_FLAG_GRAY), filter, left_cbp, top_cbp);
block_cbp |= pat << (i << 2);
if(!v->ttmbf && ttmb < 8) ttmb = -1;
first_block = 0;
}
@ -3200,13 +3325,40 @@ static int vc1_decode_p_mb(VC1Context *v)
if(v->a_avail)
s->dsp.vc1_v_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));
}
if(v->s.loop_filter && s->mb_x && s->mb_x != (s->mb_width - 1) && s->mb_y && s->mb_y != (s->mb_height - 1)){
int left_cbp, top_cbp;
if(i & 4){
left_cbp = v->cbp[s->mb_x - 1] >> (i * 4);
top_cbp = v->cbp[s->mb_x - s->mb_stride] >> (i * 4);
}else{
left_cbp = (i & 1) ? (pat >> ((i-1)*4)) : (v->cbp[s->mb_x - 1] >> ((i+1)*4));
top_cbp = (i & 2) ? (pat >> ((i-2)*4)) : (v->cbp[s->mb_x - s->mb_stride] >> ((i+2)*4));
}
if(left_cbp & 0xC)
vc1_loop_filter(s->dest[dst_idx] + off, 1, i & 4 ? s->uvlinesize : s->linesize, 8, mquant);
if(top_cbp & 0xA)
vc1_loop_filter(s->dest[dst_idx] + off, i & 4 ? s->uvlinesize : s->linesize, 1, 8, mquant);
}
block_cbp |= 0xF << (i << 2);
} else if(is_coded[i]) {
status = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb, first_block, s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize, (i&4) && (s->flags & CODEC_FLAG_GRAY));
int left_cbp = 0, top_cbp = 0, filter = 0;
if(v->s.loop_filter && s->mb_x && s->mb_x != (s->mb_width - 1) && s->mb_y && s->mb_y != (s->mb_height - 1)){
filter = 1;
if(i & 4){
left_cbp = v->cbp[s->mb_x - 1] >> (i * 4);
top_cbp = v->cbp[s->mb_x - s->mb_stride] >> (i * 4);
}else{
left_cbp = (i & 1) ? (pat >> ((i-1)*4)) : (v->cbp[s->mb_x - 1] >> ((i+1)*4));
top_cbp = (i & 2) ? (pat >> ((i-2)*4)) : (v->cbp[s->mb_x - s->mb_stride] >> ((i+2)*4));
}
}
pat = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb, first_block, s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize, (i&4) && (s->flags & CODEC_FLAG_GRAY), filter, left_cbp, top_cbp);
block_cbp |= pat << (i << 2);
if(!v->ttmbf && ttmb < 8) ttmb = -1;
first_block = 0;
}
}
return status;
return 0;
}
else //Skipped MB
{
@ -3226,6 +3378,7 @@ static int vc1_decode_p_mb(VC1Context *v)
return 0;
}
}
v->cbp[s->mb_x] = block_cbp;
/* Should never happen */
return -1;
@ -3373,7 +3526,7 @@ static void vc1_decode_b_mb(VC1Context *v)
if(v->rangeredfrm) for(j = 0; j < 64; j++) s->block[i][j] <<= 1;
s->dsp.put_signed_pixels_clamped(s->block[i], 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, s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize, (i&4) && (s->flags & CODEC_FLAG_GRAY));
vc1_decode_p_block(v, s->block[i], i, mquant, ttmb, first_block, s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize, (i&4) && (s->flags & CODEC_FLAG_GRAY), 0, 0, 0);
if(!v->ttmbf && ttmb < 8) ttmb = -1;
first_block = 0;
}
@ -3479,6 +3632,7 @@ static void vc1_decode_i_blocks(VC1Context *v)
s->dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize, s->linesize);
s->dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);
}
if(v->s.loop_filter) vc1_loop_filter_iblk(s, s->current_picture.qscale_table[mb_pos]);
if(get_bits_count(&s->gb) > v->bits) {
ff_er_add_slice(s, 0, 0, s->mb_x, s->mb_y, (AC_END|DC_END|MV_END));
@ -3609,6 +3763,7 @@ static void vc1_decode_i_blocks_adv(VC1Context *v)
s->dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize, s->linesize);
s->dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);
}
if(v->s.loop_filter) vc1_loop_filter_iblk(s, s->current_picture.qscale_table[mb_pos]);
if(get_bits_count(&s->gb) > v->bits) {
ff_er_add_slice(s, 0, 0, s->mb_x, s->mb_y, (AC_END|DC_END|MV_END));
@ -3652,6 +3807,7 @@ static void vc1_decode_p_blocks(VC1Context *v)
}
s->first_slice_line = 1;
memset(v->cbp_base, 0, sizeof(v->cbp_base[0])*2*s->mb_stride);
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);
@ -3665,6 +3821,7 @@ static void vc1_decode_p_blocks(VC1Context *v)
return;
}
}
memmove(v->cbp_base, v->cbp, sizeof(v->cbp_base[0])*s->mb_stride);
ff_draw_horiz_band(s, s->mb_y * 16, 16);
s->first_slice_line = 0;
}
@ -3713,6 +3870,7 @@ static void vc1_decode_b_blocks(VC1Context *v)
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;
}
if(v->s.loop_filter) vc1_loop_filter_iblk(s, s->current_picture.qscale_table[s->mb_x + s->mb_y *s->mb_stride]);
}
ff_draw_horiz_band(s, s->mb_y * 16, 16);
s->first_slice_line = 0;
@ -3918,6 +4076,9 @@ static av_cold int vc1_decode_init(AVCodecContext *avctx)
v->acpred_plane = av_malloc(s->mb_stride * s->mb_height);
v->over_flags_plane = av_malloc(s->mb_stride * s->mb_height);
v->cbp_base = av_malloc(sizeof(v->cbp_base[0]) * 2 * s->mb_stride);
v->cbp = v->cbp_base + s->mb_stride;
/* 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);
v->mb_type[0] = v->mb_type_base + s->b8_stride + 1;
@ -4122,6 +4283,7 @@ static av_cold int vc1_decode_end(AVCodecContext *avctx)
av_freep(&v->acpred_plane);
av_freep(&v->over_flags_plane);
av_freep(&v->mb_type_base);
av_freep(&v->cbp_base);
ff_intrax8_common_end(&v->x8);
return 0;
}

2
libavcodec/vc1.h
View File

@ -304,6 +304,8 @@ typedef struct VC1Context{
int p_frame_skipped;
int bi_type;
int x8_type;
uint32_t *cbp_base, *cbp;
} VC1Context;
#endif /* FFMPEG_VC1_H */