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gmc bitstream decoding support (the real motion compensation isnt implemnted yet)

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Originally committed as revision 318 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2002-03-07 13:27:15 +00:00
parent cc9ba006ec
commit 73c8e5144a
3 changed files with 176 additions and 12 deletions
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174
libavcodec/h263.c
View File

@ -834,6 +834,7 @@ static VLC inter_MCBPC_vlc;
static VLC cbpy_vlc;
static VLC mv_vlc;
static VLC dc_lum, dc_chrom;
static VLC sprite_trajectory;
void init_rl(RLTable *rl)
{
@ -914,6 +915,9 @@ void h263_decode_init_vlc(MpegEncContext *s)
init_vlc(&dc_chrom, 9, 13,
&DCtab_chrom[0][1], 2, 1,
&DCtab_chrom[0][0], 2, 1);
init_vlc(&sprite_trajectory, 9, 15,
&sprite_trajectory_tab[0][1], 4, 2,
&sprite_trajectory_tab[0][0], 4, 2);
}
}
@ -949,7 +953,7 @@ int h263_decode_mb(MpegEncContext *s,
INT16 *mot_val;
static INT8 quant_tab[4] = { -1, -2, 1, 2 };
if (s->pict_type == P_TYPE) {
if (s->pict_type == P_TYPE || s->pict_type==S_TYPE) {
if (get_bits1(&s->gb)) {
/* skip mb */
s->mb_intra = 0;
@ -982,6 +986,9 @@ int h263_decode_mb(MpegEncContext *s,
}
if (!s->mb_intra) {
if(s->pict_type==S_TYPE && s->vol_sprite_usage==GMC_SPRITE && (cbpc & 16) == 0)
s->mcsel= get_bits1(&s->gb);
else s->mcsel= 0;
cbpy = get_vlc(&s->gb, &cbpy_vlc);
cbp = (cbpc & 3) | ((cbpy ^ 0xf) << 2);
if (dquant) {
@ -998,15 +1005,17 @@ int h263_decode_mb(MpegEncContext *s,
h263_pred_motion(s, 0, &pred_x, &pred_y);
if (s->umvplus_dec)
mx = h263p_decode_umotion(s, pred_x);
else
else if(!s->mcsel)
mx = h263_decode_motion(s, pred_x);
else mx=0;
if (mx >= 0xffff)
return -1;
if (s->umvplus_dec)
my = h263p_decode_umotion(s, pred_y);
else
else if(!s->mcsel)
my = h263_decode_motion(s, pred_y);
else my=0;
if (my >= 0xffff)
return -1;
s->mv[0][0][0] = mx;
@ -1487,6 +1496,148 @@ int h263_decode_picture_header(MpegEncContext *s)
return 0;
}
static void mpeg4_decode_sprite_trajectory(MpegEncContext * s)
{
int i;
int a= 2<<s->sprite_warping_accuracy;
int rho= 3-s->sprite_warping_accuracy;
int r=16/a;
const int vop_ref[4][2]= {{0,0}, {s->width,0}, {0, s->height}, {s->width, s->height}}; // only true for rectangle shapes
int d[4][2]={{0,0}, {0,0}, {0,0}, {0,0}};
int sprite_ref[4][2];
int virtual_ref[2][2];
int w2, h2;
int alpha=0, beta=0;
int w= s->width;
int h= s->height;
for(i=0; i<s->num_sprite_warping_points; i++){
int length;
int x=0, y=0;
length= get_vlc(&s->gb, &sprite_trajectory);
if(length){
x= get_bits(&s->gb, length);
if ((x >> (length - 1)) == 0) /* if MSB not set it is negative*/
x = - (x ^ ((1 << length) - 1));
}
// FIXME the mpeg4 std says that here should be a marker but but divx5 doesnt have one here
// skip_bits1(&s->gb); /* marker bit */
length= get_vlc(&s->gb, &sprite_trajectory);
if(length){
y=get_bits(&s->gb, length);
if ((y >> (length - 1)) == 0) /* if MSB not set it is negative*/
y = - (y ^ ((1 << length) - 1));
}
skip_bits1(&s->gb); /* marker bit */
// printf("%d %d\n", x, y);
//if(i>0 && (x!=0 || y!=0)) printf("AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n");
d[i][0]= x;
d[i][1]= y;
}
while((1<<alpha)<w) alpha++;
while((1<<beta )<h) beta++; // there seems to be a typo in the mpeg4 std for the definition of w' and h'
w2= 1<<alpha;
h2= 1<<beta;
// Note, the 4th point isnt used for GMC
sprite_ref[0][0]= (a>>1)*(2*vop_ref[0][0] + d[0][0]);
sprite_ref[0][1]= (a>>1)*(2*vop_ref[0][1] + d[0][1]);
sprite_ref[1][0]= (a>>1)*(2*vop_ref[1][0] + d[0][0] + d[1][0]);
sprite_ref[1][1]= (a>>1)*(2*vop_ref[1][1] + d[0][1] + d[1][1]);
sprite_ref[2][0]= (a>>1)*(2*vop_ref[2][0] + d[0][0] + d[2][0]);
sprite_ref[2][1]= (a>>1)*(2*vop_ref[2][1] + d[0][1] + d[2][1]);
/* sprite_ref[3][0]= (a>>1)*(2*vop_ref[3][0] + d[0][0] + d[1][0] + d[2][0] + d[3][0]);
sprite_ref[3][1]= (a>>1)*(2*vop_ref[3][1] + d[0][1] + d[1][1] + d[2][1] + d[3][1]); */
// this is mostly identical to the mpeg4 std (and is totally unreadable because of that ...)
// perhaps it should be reordered to be more readable ...
// the idea behind this virtual_ref mess is to be able to use shifts later per pixel instead of divides
// so the distance between points is converted from w&h based to w2&h2 based which are of the 2^x form
// FIXME rounding (they should be positive but who knows ...)
virtual_ref[0][0]= 16*(vop_ref[0][0] + w2)
+ ((w - w2)*(r*sprite_ref[0][0] - 16*vop_ref[0][0]) + w2*(r*sprite_ref[1][0] - 16*vop_ref[1][0]) + w/2)/w;
virtual_ref[0][1]= 16*vop_ref[0][1]
+ ((w - w2)*(r*sprite_ref[0][1] - 16*vop_ref[0][1]) + w2*(r*sprite_ref[1][1] - 16*vop_ref[1][1]) + w/2)/w;
virtual_ref[1][0]= 16*vop_ref[0][0]
+ ((h - h2)*(r*sprite_ref[0][0] - 16*vop_ref[0][0]) + h2*(r*sprite_ref[2][0] - 16*vop_ref[2][0]) + h/2)/h;
virtual_ref[1][1]= 16*(vop_ref[0][1] + h2)
+ ((h - h2)*(r*sprite_ref[0][1] - 16*vop_ref[0][1]) + h2*(r*sprite_ref[2][1] - 16*vop_ref[2][1]) + h/2)/h;
switch(s->num_sprite_warping_points)
{
case 0:
s->sprite_offset[0][0]= 0;
s->sprite_offset[0][1]= 0;
s->sprite_offset[1][0]= 0;
s->sprite_offset[1][1]= 0;
s->sprite_delta[0][0][0]= a;
s->sprite_delta[0][0][1]= 0;
s->sprite_delta[0][1][0]= 0;
s->sprite_delta[0][1][1]= a;
s->sprite_delta[1][0][0]= a;
s->sprite_delta[1][0][1]= 0;
s->sprite_delta[1][1][0]= 0;
s->sprite_delta[1][1][1]= a;
s->sprite_shift[0][0]= 0;
s->sprite_shift[0][1]= 0;
s->sprite_shift[1][0]= 0;
s->sprite_shift[1][1]= 0;
break;
case 1: //GMC only
s->sprite_offset[0][0]= sprite_ref[0][0] - a*vop_ref[0][0];
s->sprite_offset[0][1]= sprite_ref[0][1] - a*vop_ref[0][1];
s->sprite_offset[1][0]= ((sprite_ref[0][0]>>1)|(sprite_ref[0][0]&1)) - a*(vop_ref[0][0]/2);
s->sprite_offset[1][1]= ((sprite_ref[0][1]>>1)|(sprite_ref[0][1]&1)) - a*(vop_ref[0][1]/2);
s->sprite_delta[0][0][0]= a;
s->sprite_delta[0][0][1]= 0;
s->sprite_delta[0][1][0]= 0;
s->sprite_delta[0][1][1]= a;
s->sprite_delta[1][0][0]= a;
s->sprite_delta[1][0][1]= 0;
s->sprite_delta[1][1][0]= 0;
s->sprite_delta[1][1][1]= a;
s->sprite_shift[0][0]= 0;
s->sprite_shift[0][1]= 0;
s->sprite_shift[1][0]= 0;
s->sprite_shift[1][1]= 0;
break;
case 2:
case 3: //FIXME
s->sprite_offset[0][0]= (sprite_ref[0][0]<<(alpha+rho))
+ ((-r*sprite_ref[0][0] + virtual_ref[0][0])*(-vop_ref[0][0])
+( r*sprite_ref[0][1] - virtual_ref[0][1])*(-vop_ref[0][1]));
s->sprite_offset[0][1]= (sprite_ref[0][1]<<(alpha+rho))
+ ((-r*sprite_ref[0][1] + virtual_ref[0][1])*(-vop_ref[0][0])
+(-r*sprite_ref[0][0] + virtual_ref[0][0])*(-vop_ref[0][1]));
s->sprite_offset[1][0]= ((-r*sprite_ref[0][0] + virtual_ref[0][0])*(-2*vop_ref[0][0] + 1)
+( r*sprite_ref[0][1] - virtual_ref[0][1])*(-2*vop_ref[0][1] + 1)
+2*w2*r*sprite_ref[0][0] - 16*w2);
s->sprite_offset[1][1]= ((-r*sprite_ref[0][1] + virtual_ref[0][1])*(-2*vop_ref[0][0] + 1)
+(-r*sprite_ref[0][0] + virtual_ref[0][0])*(-2*vop_ref[0][1] + 1)
+2*w2*r*sprite_ref[0][1] - 16*w2);
s->sprite_delta[0][0][0]= (-r*sprite_ref[0][0] + virtual_ref[0][0]);
s->sprite_delta[0][0][1]= ( r*sprite_ref[0][1] - virtual_ref[0][1]);
s->sprite_delta[0][1][0]= (-r*sprite_ref[0][1] + virtual_ref[0][1]);
s->sprite_delta[0][1][1]= (-r*sprite_ref[0][0] + virtual_ref[0][0]);
s->sprite_delta[1][0][0]= 4*(-r*sprite_ref[0][0] + virtual_ref[0][0]);
s->sprite_delta[1][0][1]= 4*( r*sprite_ref[0][1] - virtual_ref[0][1]);
s->sprite_delta[1][1][0]= 4*(-r*sprite_ref[0][1] + virtual_ref[0][1]);
s->sprite_delta[1][1][1]= 4*(-r*sprite_ref[0][0] + virtual_ref[0][0]);
s->sprite_shift[0][0]= alpha+rho;
s->sprite_shift[0][1]= alpha+rho;
s->sprite_shift[1][0]= alpha+rho+2;
s->sprite_shift[1][1]= alpha+rho+2;
break;
// case 3:
break;
}
}
/* decode mpeg4 VOP header */
int mpeg4_decode_picture_header(MpegEncContext * s)
{
@ -1559,12 +1710,13 @@ int mpeg4_decode_picture_header(MpegEncContext * s)
}
skip_bits1(&s->gb); /* interlaced */
skip_bits1(&s->gb); /* OBMC Disable */
if(!get_bits1(&s->gb)) printf("OBMC not supported\n"); /* OBMC Disable */
if (vo_ver_id == 1) {
s->vol_sprite_usage = get_bits1(&s->gb); /* vol_sprite_usage */
} else {
s->vol_sprite_usage = get_bits(&s->gb, 2); /* vol_sprite_usage */
}
if(s->vol_sprite_usage==STATIC_SPRITE) printf("Static Sprites not supported\n");
if(s->vol_sprite_usage==STATIC_SPRITE || s->vol_sprite_usage==GMC_SPRITE){
if(s->vol_sprite_usage==STATIC_SPRITE){
s->sprite_width = get_bits(&s->gb, 13);
@ -1576,7 +1728,7 @@ int mpeg4_decode_picture_header(MpegEncContext * s)
s->sprite_top = get_bits(&s->gb, 13);
skip_bits1(&s->gb); /* marker */
}
s->no_sprite_wraping_points= get_bits(&s->gb, 6);
s->num_sprite_warping_points= get_bits(&s->gb, 6);
s->sprite_warping_accuracy = get_bits(&s->gb, 2);
s->sprite_brightness_change= get_bits1(&s->gb);
if(s->vol_sprite_usage==STATIC_SPRITE)
@ -1649,7 +1801,7 @@ int mpeg4_decode_picture_header(MpegEncContext * s)
if(s->pict_type == S_TYPE)
{
printf("S-VOP\n");
return -1;
// return -1;
}
/* XXX: parse time base */
@ -1697,13 +1849,15 @@ int mpeg4_decode_picture_header(MpegEncContext * s)
skip_bits(&s->gb, 3); /* intra dc VLC threshold */
//FIXME interlaced specific bits
}
if(s->pict_type == S_TYPE && (s->vol_sprite_usage==STATIC_SPRITE || s->vol_sprite_usage==GMC_SPRITE)){
if(s->no_sprite_wraping_points) printf("sprite_wraping_points not supported\n");
if(s->num_sprite_warping_points){
mpeg4_decode_sprite_trajectory(s);
}
if(s->sprite_brightness_change) printf("sprite_brightness_change not supported\n");
if(s->vol_sprite_usage==STATIC_SPRITE) printf("static sprite not supported\n");
}
if (s->shape != BIN_ONLY_SHAPE) {
/* note: we do not use quant_precision to avoid problem if no
MPEG4 vol header as it is found on some old opendivx
@ -1716,7 +1870,7 @@ int mpeg4_decode_picture_header(MpegEncContext * s)
if (s->pict_type == B_TYPE) {
s->b_code = get_bits(&s->gb, 3);
}
//printf("quant:%d fcode:%d\n", s->qscale, s->f_code);
if(!s->scalability){
if (s->shape!=RECT_SHAPE && s->pict_type!=I_TYPE) {
skip_bits1(&s->gb); // vop shape coding type

6
libavcodec/mpeg4data.h
View File

@ -93,3 +93,9 @@ static RLTable rl_intra = {
intra_run,
intra_level,
};
static const UINT16 sprite_trajectory_tab[15][2] = {
{0x00, 2}, {0x02, 3}, {0x03, 3}, {0x04, 3}, {0x05, 3}, {0x06, 3},
{0x0E, 4}, {0x1E, 5}, {0x3E, 6}, {0x7E, 7}, {0xFE, 8},
{0x1FE, 9},{0x3FE, 10},{0x7FE, 11},{0xFFE, 12},
};

8
libavcodec/mpegvideo.h
View File

@ -164,7 +164,11 @@ typedef struct MpegEncContext {
int sprite_left;
int sprite_top;
int sprite_brightness_change;
int no_sprite_wraping_points;
int num_sprite_warping_points;
int sprite_offset[2][2];
int sprite_delta[2][2][2];
int sprite_shift[2][2];
int mcsel;
int quant_precision;
int quarter_sample;
int scalability;
@ -174,7 +178,7 @@ typedef struct MpegEncContext {
int sprite_warping_accuracy;
int low_latency_sprite;
int data_partioning;
/* RV10 specific */
int rv10_version; /* RV10 version: 0 or 3 */
int rv10_first_dc_coded[3];