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author | Michael Niedermayer <michaelni@gmx.at> | 2002-03-07 13:27:15 +0000 |
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committer | Michael Niedermayer <michaelni@gmx.at> | 2002-03-07 13:27:15 +0000 |
commit | 73c8e5144af3f90ccb21fa1d058ae02b3394aab0 (patch) | |
tree | c1e5f6cbbcf985a6e697091ba9503cc83d9d1065 /libavcodec | |
parent | cc9ba006eca2222fb1bc3cdde40a6a9d8f36ef75 (diff) | |
download | ffmpeg-73c8e5144af3f90ccb21fa1d058ae02b3394aab0.tar.gz |
gmc bitstream decoding support (the real motion compensation isnt implemnted yet)
Originally committed as revision 318 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec')
-rw-r--r-- | libavcodec/h263.c | 174 | ||||
-rw-r--r-- | libavcodec/mpeg4data.h | 6 | ||||
-rw-r--r-- | libavcodec/mpegvideo.h | 8 |
3 files changed, 176 insertions, 12 deletions
diff --git a/libavcodec/h263.c b/libavcodec/h263.c index e6ac807897..a9e6fcf393 100644 --- a/libavcodec/h263.c +++ b/libavcodec/h263.c @@ -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 diff --git a/libavcodec/mpeg4data.h b/libavcodec/mpeg4data.h index e9cb30d6a5..4eed756545 100644 --- a/libavcodec/mpeg4data.h +++ b/libavcodec/mpeg4data.h @@ -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}, +}; diff --git a/libavcodec/mpegvideo.h b/libavcodec/mpegvideo.h index b9328a0a43..4413de30fd 100644 --- a/libavcodec/mpegvideo.h +++ b/libavcodec/mpegvideo.h @@ -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]; |