diff options
author | Diego Biurrun <diego@biurrun.de> | 2009-12-30 17:51:46 +0300 |
---|---|---|
committer | Diego Biurrun <diego@biurrun.de> | 2009-12-30 17:51:46 +0300 |
commit | 2a992f467a45fc129a01284ecf837559c4107d44 (patch) | |
tree | e3032de527a32c9ed8eec622cd3dced9ced03181 /libavcodec/h263.c | |
parent | 1436f3170944449348daa7d1f9fc57f44aa76c40 (diff) |
cosmetics: Move MPEG-4 decoding functions around to avoid forward declarations.
Originally committed as revision 20979 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/h263.c')
-rw-r--r-- | libavcodec/h263.c | 1151 |
1 files changed, 572 insertions, 579 deletions
diff --git a/libavcodec/h263.c b/libavcodec/h263.c index 158b737429..dfbcfc638e 100644 --- a/libavcodec/h263.c +++ b/libavcodec/h263.c @@ -56,13 +56,6 @@ #define H263_MBTYPE_B_VLC_BITS 6 #define CBPC_B_VLC_BITS 3 -static inline int mpeg4_decode_dc(MpegEncContext * s, int n, int *dir_ptr); -static inline int mpeg4_decode_block(MpegEncContext * s, DCTELEM * block, - int n, int coded, int intra, int rvlc); - -static void mpeg4_decode_sprite_trajectory(MpegEncContext * s, GetBitContext *gb); -static inline int ff_mpeg4_pred_dc(MpegEncContext * s, int n, int level, int *dir_ptr, int encoding); - #if CONFIG_ENCODERS static void mpeg4_encode_visual_object_header(MpegEncContext *s); static void mpeg4_encode_vol_header(MpegEncContext *s, int vo_number, @@ -872,6 +865,85 @@ static inline void mpeg4_encode_blocks(MpegEncContext * s, DCTELEM block[6][64], } } +/** + * predicts the dc. + * encoding quantized level -> quantized diff + * decoding quantized diff -> quantized level + * @param n block index (0-3 are luma, 4-5 are chroma) + * @param dir_ptr pointer to an integer where the prediction direction will be stored + */ +static inline int ff_mpeg4_pred_dc(MpegEncContext * s, int n, int level, int *dir_ptr, int encoding) +{ + int a, b, c, wrap, pred, scale, ret; + int16_t *dc_val; + + /* find prediction */ + if (n < 4) { + scale = s->y_dc_scale; + } else { + scale = s->c_dc_scale; + } + if(IS_3IV1) + scale= 8; + + wrap= s->block_wrap[n]; + dc_val = s->dc_val[0] + s->block_index[n]; + + /* B C + * A X + */ + a = dc_val[ - 1]; + b = dc_val[ - 1 - wrap]; + c = dc_val[ - wrap]; + + /* outside slice handling (we can't do that by memset as we need the dc for error resilience) */ + if(s->first_slice_line && n!=3){ + if(n!=2) b=c= 1024; + if(n!=1 && s->mb_x == s->resync_mb_x) b=a= 1024; + } + if(s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y+1){ + if(n==0 || n==4 || n==5) + b=1024; + } + + if (abs(a - b) < abs(b - c)) { + pred = c; + *dir_ptr = 1; /* top */ + } else { + pred = a; + *dir_ptr = 0; /* left */ + } + /* we assume pred is positive */ + pred = FASTDIV((pred + (scale >> 1)), scale); + + if(encoding){ + ret = level - pred; + }else{ + level += pred; + ret= level; + if(s->error_recognition>=3){ + if(level<0){ + av_log(s->avctx, AV_LOG_ERROR, "dc<0 at %dx%d\n", s->mb_x, s->mb_y); + return -1; + } + if(level*scale > 2048 + scale){ + av_log(s->avctx, AV_LOG_ERROR, "dc overflow at %dx%d\n", s->mb_x, s->mb_y); + return -1; + } + } + } + level *=scale; + if(level&(~2047)){ + if(level<0) + level=0; + else if(!(s->workaround_bugs&FF_BUG_DC_CLIP)) + level=2047; + } + dc_val[0]= level; + + return ret; +} + static const int dquant_code[5]= {1,0,9,2,3}; void mpeg4_encode_mb(MpegEncContext * s, @@ -2475,85 +2547,6 @@ void mpeg4_encode_picture_header(MpegEncContext * s, int picture_number) #endif //CONFIG_ENCODERS /** - * predicts the dc. - * encoding quantized level -> quantized diff - * decoding quantized diff -> quantized level - * @param n block index (0-3 are luma, 4-5 are chroma) - * @param dir_ptr pointer to an integer where the prediction direction will be stored - */ -static inline int ff_mpeg4_pred_dc(MpegEncContext * s, int n, int level, int *dir_ptr, int encoding) -{ - int a, b, c, wrap, pred, scale, ret; - int16_t *dc_val; - - /* find prediction */ - if (n < 4) { - scale = s->y_dc_scale; - } else { - scale = s->c_dc_scale; - } - if(IS_3IV1) - scale= 8; - - wrap= s->block_wrap[n]; - dc_val = s->dc_val[0] + s->block_index[n]; - - /* B C - * A X - */ - a = dc_val[ - 1]; - b = dc_val[ - 1 - wrap]; - c = dc_val[ - wrap]; - - /* outside slice handling (we can't do that by memset as we need the dc for error resilience) */ - if(s->first_slice_line && n!=3){ - if(n!=2) b=c= 1024; - if(n!=1 && s->mb_x == s->resync_mb_x) b=a= 1024; - } - if(s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y+1){ - if(n==0 || n==4 || n==5) - b=1024; - } - - if (abs(a - b) < abs(b - c)) { - pred = c; - *dir_ptr = 1; /* top */ - } else { - pred = a; - *dir_ptr = 0; /* left */ - } - /* we assume pred is positive */ - pred = FASTDIV((pred + (scale >> 1)), scale); - - if(encoding){ - ret = level - pred; - }else{ - level += pred; - ret= level; - if(s->error_recognition>=3){ - if(level<0){ - av_log(s->avctx, AV_LOG_ERROR, "dc<0 at %dx%d\n", s->mb_x, s->mb_y); - return -1; - } - if(level*scale > 2048 + scale){ - av_log(s->avctx, AV_LOG_ERROR, "dc overflow at %dx%d\n", s->mb_x, s->mb_y); - return -1; - } - } - } - level *=scale; - if(level&(~2047)){ - if(level<0) - level=0; - else if(!(s->workaround_bugs&FF_BUG_DC_CLIP)) - level=2047; - } - dc_val[0]= level; - - return ret; -} - -/** * predicts the ac. * @param n block index (0-3 are luma, 4-5 are chroma) * @param dir the ac prediction direction @@ -3126,6 +3119,196 @@ static inline int mpeg4_is_resync(MpegEncContext *s){ return 0; } +static void mpeg4_decode_sprite_trajectory(MpegEncContext * s, GetBitContext *gb) +{ + 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, w3, h3; + int alpha=0, beta=0; + int w= s->width; + int h= s->height; + int min_ab; + + for(i=0; i<s->num_sprite_warping_points; i++){ + int length; + int x=0, y=0; + + length= get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3); + if(length){ + x= get_xbits(gb, length); + } + if(!(s->divx_version==500 && s->divx_build==413)) skip_bits1(gb); /* marker bit */ + + length= get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3); + if(length){ + y=get_xbits(gb, length); + } + skip_bits1(gb); /* marker bit */ + s->sprite_traj[i][0]= d[i][0]= x; + s->sprite_traj[i][1]= d[i][1]= y; + } + for(; i<4; i++) + s->sprite_traj[i][0]= s->sprite_traj[i][1]= 0; + + 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 isn't used for GMC + if(s->divx_version==500 && s->divx_build==413){ + sprite_ref[0][0]= a*vop_ref[0][0] + d[0][0]; + sprite_ref[0][1]= a*vop_ref[0][1] + d[0][1]; + sprite_ref[1][0]= a*vop_ref[1][0] + d[0][0] + d[1][0]; + sprite_ref[1][1]= a*vop_ref[1][1] + d[0][1] + d[1][1]; + sprite_ref[2][0]= a*vop_ref[2][0] + d[0][0] + d[2][0]; + sprite_ref[2][1]= a*vop_ref[2][1] + d[0][1] + d[2][1]; + } else { + 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 + virtual_ref[0][0]= 16*(vop_ref[0][0] + w2) + + ROUNDED_DIV(((w - w2)*(r*sprite_ref[0][0] - 16*vop_ref[0][0]) + w2*(r*sprite_ref[1][0] - 16*vop_ref[1][0])),w); + virtual_ref[0][1]= 16*vop_ref[0][1] + + ROUNDED_DIV(((w - w2)*(r*sprite_ref[0][1] - 16*vop_ref[0][1]) + w2*(r*sprite_ref[1][1] - 16*vop_ref[1][1])),w); + virtual_ref[1][0]= 16*vop_ref[0][0] + + ROUNDED_DIV(((h - h2)*(r*sprite_ref[0][0] - 16*vop_ref[0][0]) + h2*(r*sprite_ref[2][0] - 16*vop_ref[2][0])),h); + virtual_ref[1][1]= 16*(vop_ref[0][1] + h2) + + ROUNDED_DIV(((h - h2)*(r*sprite_ref[0][1] - 16*vop_ref[0][1]) + h2*(r*sprite_ref[2][1] - 16*vop_ref[2][1])),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]= a; + s->sprite_delta[0][1]= 0; + s->sprite_delta[1][0]= 0; + s->sprite_delta[1][1]= a; + s->sprite_shift[0]= 0; + s->sprite_shift[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]= a; + s->sprite_delta[0][1]= 0; + s->sprite_delta[1][0]= 0; + s->sprite_delta[1][1]= a; + s->sprite_shift[0]= 0; + s->sprite_shift[1]= 0; + break; + case 2: + 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]) + + (1<<(alpha+rho-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]) + + (1<<(alpha+rho-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 + + (1<<(alpha+rho+1))); + 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 + + (1<<(alpha+rho+1))); + s->sprite_delta[0][0]= (-r*sprite_ref[0][0] + virtual_ref[0][0]); + s->sprite_delta[0][1]= (+r*sprite_ref[0][1] - virtual_ref[0][1]); + s->sprite_delta[1][0]= (-r*sprite_ref[0][1] + virtual_ref[0][1]); + s->sprite_delta[1][1]= (-r*sprite_ref[0][0] + virtual_ref[0][0]); + + s->sprite_shift[0]= alpha+rho; + s->sprite_shift[1]= alpha+rho+2; + break; + case 3: + min_ab= FFMIN(alpha, beta); + w3= w2>>min_ab; + h3= h2>>min_ab; + s->sprite_offset[0][0]= (sprite_ref[0][0]<<(alpha+beta+rho-min_ab)) + + (-r*sprite_ref[0][0] + virtual_ref[0][0])*h3*(-vop_ref[0][0]) + + (-r*sprite_ref[0][0] + virtual_ref[1][0])*w3*(-vop_ref[0][1]) + + (1<<(alpha+beta+rho-min_ab-1)); + s->sprite_offset[0][1]= (sprite_ref[0][1]<<(alpha+beta+rho-min_ab)) + + (-r*sprite_ref[0][1] + virtual_ref[0][1])*h3*(-vop_ref[0][0]) + + (-r*sprite_ref[0][1] + virtual_ref[1][1])*w3*(-vop_ref[0][1]) + + (1<<(alpha+beta+rho-min_ab-1)); + s->sprite_offset[1][0]= (-r*sprite_ref[0][0] + virtual_ref[0][0])*h3*(-2*vop_ref[0][0] + 1) + + (-r*sprite_ref[0][0] + virtual_ref[1][0])*w3*(-2*vop_ref[0][1] + 1) + + 2*w2*h3*r*sprite_ref[0][0] + - 16*w2*h3 + + (1<<(alpha+beta+rho-min_ab+1)); + s->sprite_offset[1][1]= (-r*sprite_ref[0][1] + virtual_ref[0][1])*h3*(-2*vop_ref[0][0] + 1) + + (-r*sprite_ref[0][1] + virtual_ref[1][1])*w3*(-2*vop_ref[0][1] + 1) + + 2*w2*h3*r*sprite_ref[0][1] + - 16*w2*h3 + + (1<<(alpha+beta+rho-min_ab+1)); + s->sprite_delta[0][0]= (-r*sprite_ref[0][0] + virtual_ref[0][0])*h3; + s->sprite_delta[0][1]= (-r*sprite_ref[0][0] + virtual_ref[1][0])*w3; + s->sprite_delta[1][0]= (-r*sprite_ref[0][1] + virtual_ref[0][1])*h3; + s->sprite_delta[1][1]= (-r*sprite_ref[0][1] + virtual_ref[1][1])*w3; + + s->sprite_shift[0]= alpha + beta + rho - min_ab; + s->sprite_shift[1]= alpha + beta + rho - min_ab + 2; + break; + } + /* try to simplify the situation */ + if( s->sprite_delta[0][0] == a<<s->sprite_shift[0] + && s->sprite_delta[0][1] == 0 + && s->sprite_delta[1][0] == 0 + && s->sprite_delta[1][1] == a<<s->sprite_shift[0]) + { + s->sprite_offset[0][0]>>=s->sprite_shift[0]; + s->sprite_offset[0][1]>>=s->sprite_shift[0]; + s->sprite_offset[1][0]>>=s->sprite_shift[1]; + s->sprite_offset[1][1]>>=s->sprite_shift[1]; + s->sprite_delta[0][0]= a; + s->sprite_delta[0][1]= 0; + s->sprite_delta[1][0]= 0; + s->sprite_delta[1][1]= a; + s->sprite_shift[0]= 0; + s->sprite_shift[1]= 0; + s->real_sprite_warping_points=1; + } + else{ + int shift_y= 16 - s->sprite_shift[0]; + int shift_c= 16 - s->sprite_shift[1]; + for(i=0; i<2; i++){ + s->sprite_offset[0][i]<<= shift_y; + s->sprite_offset[1][i]<<= shift_c; + s->sprite_delta[0][i]<<= shift_y; + s->sprite_delta[1][i]<<= shift_y; + s->sprite_shift[i]= 16; + } + s->real_sprite_warping_points= s->num_sprite_warping_points; + } +} + /** * decodes the next video packet. * @return <0 if something went wrong @@ -3399,6 +3582,53 @@ static inline int get_amv(MpegEncContext *s, int n){ } /** + * decodes the dc value. + * @param n block index (0-3 are luma, 4-5 are chroma) + * @param dir_ptr the prediction direction will be stored here + * @return the quantized dc + */ +static inline int mpeg4_decode_dc(MpegEncContext * s, int n, int *dir_ptr) +{ + int level, code; + + if (n < 4) + code = get_vlc2(&s->gb, dc_lum.table, DC_VLC_BITS, 1); + else + code = get_vlc2(&s->gb, dc_chrom.table, DC_VLC_BITS, 1); + if (code < 0 || code > 9 /* && s->nbit<9 */){ + av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n"); + return -1; + } + if (code == 0) { + level = 0; + } else { + if(IS_3IV1){ + if(code==1) + level= 2*get_bits1(&s->gb)-1; + else{ + if(get_bits1(&s->gb)) + level = get_bits(&s->gb, code-1) + (1<<(code-1)); + else + level = -get_bits(&s->gb, code-1) - (1<<(code-1)); + } + }else{ + level = get_xbits(&s->gb, code); + } + + if (code > 8){ + if(get_bits1(&s->gb)==0){ /* marker */ + if(s->error_recognition>=2){ + av_log(s->avctx, AV_LOG_ERROR, "dc marker bit missing\n"); + return -1; + } + } + } + } + + return ff_mpeg4_pred_dc(s, n, level, dir_ptr, 0); +} + +/** * decodes first partition. * @return number of MBs decoded or <0 if an error occurred */ @@ -3704,6 +3934,262 @@ int ff_mpeg4_decode_partitions(MpegEncContext *s) } /** + * decodes a block. + * @return <0 if an error occurred + */ +static inline int mpeg4_decode_block(MpegEncContext * s, DCTELEM * block, + int n, int coded, int intra, int rvlc) +{ + int level, i, last, run; + int dc_pred_dir; + RLTable * rl; + RL_VLC_ELEM * rl_vlc; + const uint8_t * scan_table; + int qmul, qadd; + + //Note intra & rvlc should be optimized away if this is inlined + + if(intra) { + if(s->use_intra_dc_vlc){ + /* DC coef */ + if(s->partitioned_frame){ + level = s->dc_val[0][ s->block_index[n] ]; + if(n<4) level= FASTDIV((level + (s->y_dc_scale>>1)), s->y_dc_scale); + else level= FASTDIV((level + (s->c_dc_scale>>1)), s->c_dc_scale); + dc_pred_dir= (s->pred_dir_table[s->mb_x + s->mb_y*s->mb_stride]<<n)&32; + }else{ + level = mpeg4_decode_dc(s, n, &dc_pred_dir); + if (level < 0) + return -1; + } + block[0] = level; + i = 0; + }else{ + i = -1; + ff_mpeg4_pred_dc(s, n, 0, &dc_pred_dir, 0); + } + if (!coded) + goto not_coded; + + if(rvlc){ + rl = &rvlc_rl_intra; + rl_vlc = rvlc_rl_intra.rl_vlc[0]; + }else{ + rl = &rl_intra; + rl_vlc = rl_intra.rl_vlc[0]; + } + if (s->ac_pred) { + if (dc_pred_dir == 0) + scan_table = s->intra_v_scantable.permutated; /* left */ + else + scan_table = s->intra_h_scantable.permutated; /* top */ + } else { + scan_table = s->intra_scantable.permutated; + } + qmul=1; + qadd=0; + } else { + i = -1; + if (!coded) { + s->block_last_index[n] = i; + return 0; + } + if(rvlc) rl = &rvlc_rl_inter; + else rl = &rl_inter; + + scan_table = s->intra_scantable.permutated; + + if(s->mpeg_quant){ + qmul=1; + qadd=0; + if(rvlc){ + rl_vlc = rvlc_rl_inter.rl_vlc[0]; + }else{ + rl_vlc = rl_inter.rl_vlc[0]; + } + }else{ + qmul = s->qscale << 1; + qadd = (s->qscale - 1) | 1; + if(rvlc){ + rl_vlc = rvlc_rl_inter.rl_vlc[s->qscale]; + }else{ + rl_vlc = rl_inter.rl_vlc[s->qscale]; + } + } + } + { + OPEN_READER(re, &s->gb); + for(;;) { + UPDATE_CACHE(re, &s->gb); + GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0); + if (level==0) { + /* escape */ + if(rvlc){ + if(SHOW_UBITS(re, &s->gb, 1)==0){ + av_log(s->avctx, AV_LOG_ERROR, "1. marker bit missing in rvlc esc\n"); + return -1; + }; SKIP_CACHE(re, &s->gb, 1); + + last= SHOW_UBITS(re, &s->gb, 1); SKIP_CACHE(re, &s->gb, 1); + run= SHOW_UBITS(re, &s->gb, 6); LAST_SKIP_CACHE(re, &s->gb, 6); + SKIP_COUNTER(re, &s->gb, 1+1+6); + UPDATE_CACHE(re, &s->gb); + + if(SHOW_UBITS(re, &s->gb, 1)==0){ + av_log(s->avctx, AV_LOG_ERROR, "2. marker bit missing in rvlc esc\n"); + return -1; + }; SKIP_CACHE(re, &s->gb, 1); + + level= SHOW_UBITS(re, &s->gb, 11); SKIP_CACHE(re, &s->gb, 11); + + if(SHOW_UBITS(re, &s->gb, 5)!=0x10){ + av_log(s->avctx, AV_LOG_ERROR, "reverse esc missing\n"); + return -1; + }; SKIP_CACHE(re, &s->gb, 5); + + level= level * qmul + qadd; + level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); LAST_SKIP_CACHE(re, &s->gb, 1); + SKIP_COUNTER(re, &s->gb, 1+11+5+1); + + i+= run + 1; + if(last) i+=192; + }else{ + int cache; + cache= GET_CACHE(re, &s->gb); + + if(IS_3IV1) + cache ^= 0xC0000000; + + if (cache&0x80000000) { + if (cache&0x40000000) { + /* third escape */ + SKIP_CACHE(re, &s->gb, 2); + last= SHOW_UBITS(re, &s->gb, 1); SKIP_CACHE(re, &s->gb, 1); + run= SHOW_UBITS(re, &s->gb, 6); LAST_SKIP_CACHE(re, &s->gb, 6); + SKIP_COUNTER(re, &s->gb, 2+1+6); + UPDATE_CACHE(re, &s->gb); + + if(IS_3IV1){ + level= SHOW_SBITS(re, &s->gb, 12); LAST_SKIP_BITS(re, &s->gb, 12); + }else{ + if(SHOW_UBITS(re, &s->gb, 1)==0){ + av_log(s->avctx, AV_LOG_ERROR, "1. marker bit missing in 3. esc\n"); + return -1; + }; SKIP_CACHE(re, &s->gb, 1); + + level= SHOW_SBITS(re, &s->gb, 12); SKIP_CACHE(re, &s->gb, 12); + + if(SHOW_UBITS(re, &s->gb, 1)==0){ + av_log(s->avctx, AV_LOG_ERROR, "2. marker bit missing in 3. esc\n"); + return -1; + }; LAST_SKIP_CACHE(re, &s->gb, 1); + + SKIP_COUNTER(re, &s->gb, 1+12+1); + } + +#if 0 + if(s->error_recognition >= FF_ER_COMPLIANT){ + const int abs_level= FFABS(level); + if(abs_level<=MAX_LEVEL && run<=MAX_RUN){ + const int run1= run - rl->max_run[last][abs_level] - 1; + if(abs_level <= rl->max_level[last][run]){ + av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, vlc encoding possible\n"); + return -1; + } + if(s->error_recognition > FF_ER_COMPLIANT){ + if(abs_level <= rl->max_level[last][run]*2){ + av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 1 encoding possible\n"); + return -1; + } + if(run1 >= 0 && abs_level <= rl->max_level[last][run1]){ + av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 2 encoding possible\n"); + return -1; + } + } + } + } +#endif + if (level>0) level= level * qmul + qadd; + else level= level * qmul - qadd; + + if((unsigned)(level + 2048) > 4095){ + if(s->error_recognition > FF_ER_COMPLIANT){ + if(level > 2560 || level<-2560){ + av_log(s->avctx, AV_LOG_ERROR, "|level| overflow in 3. esc, qp=%d\n", s->qscale); + return -1; + } + } + level= level<0 ? -2048 : 2047; + } + + i+= run + 1; + if(last) i+=192; + } else { + /* second escape */ +#if MIN_CACHE_BITS < 20 + LAST_SKIP_BITS(re, &s->gb, 2); + UPDATE_CACHE(re, &s->gb); +#else + SKIP_BITS(re, &s->gb, 2); +#endif + GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1); + i+= run + rl->max_run[run>>7][level/qmul] +1; //FIXME opt indexing + level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); + LAST_SKIP_BITS(re, &s->gb, 1); + } + } else { + /* first escape */ +#if MIN_CACHE_BITS < 19 + LAST_SKIP_BITS(re, &s->gb, 1); + UPDATE_CACHE(re, &s->gb); +#else + SKIP_BITS(re, &s->gb, 1); +#endif + GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1); + i+= run; + level = level + rl->max_level[run>>7][(run-1)&63] * qmul;//FIXME opt indexing + level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); + LAST_SKIP_BITS(re, &s->gb, 1); + } + } + } else { + i+= run; + level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); + LAST_SKIP_BITS(re, &s->gb, 1); + } + if (i > 62){ + i-= 192; + if(i&(~63)){ + av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y); + return -1; + } + + block[scan_table[i]] = level; + break; + } + + block[scan_table[i]] = level; + } + CLOSE_READER(re, &s->gb); + } + not_coded: + if (intra) { + if(!s->use_intra_dc_vlc){ + block[0] = ff_mpeg4_pred_dc(s, n, block[0], &dc_pred_dir, 0); + + i -= i>>31; //if(i == -1) i=0; + } + + mpeg4_pred_ac(s, block, n, dc_pred_dir); + if (s->ac_pred) { + i = 63; /* XXX: not optimal */ + } + } + s->block_last_index[n] = i; + return 0; +} + +/** * decode partition C of one MB. * @return <0 if an error occurred */ @@ -4682,309 +5168,6 @@ end: return SLICE_OK; } -/** - * decodes the dc value. - * @param n block index (0-3 are luma, 4-5 are chroma) - * @param dir_ptr the prediction direction will be stored here - * @return the quantized dc - */ -static inline int mpeg4_decode_dc(MpegEncContext * s, int n, int *dir_ptr) -{ - int level, code; - - if (n < 4) - code = get_vlc2(&s->gb, dc_lum.table, DC_VLC_BITS, 1); - else - code = get_vlc2(&s->gb, dc_chrom.table, DC_VLC_BITS, 1); - if (code < 0 || code > 9 /* && s->nbit<9 */){ - av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n"); - return -1; - } - if (code == 0) { - level = 0; - } else { - if(IS_3IV1){ - if(code==1) - level= 2*get_bits1(&s->gb)-1; - else{ - if(get_bits1(&s->gb)) - level = get_bits(&s->gb, code-1) + (1<<(code-1)); - else - level = -get_bits(&s->gb, code-1) - (1<<(code-1)); - } - }else{ - level = get_xbits(&s->gb, code); - } - - if (code > 8){ - if(get_bits1(&s->gb)==0){ /* marker */ - if(s->error_recognition>=2){ - av_log(s->avctx, AV_LOG_ERROR, "dc marker bit missing\n"); - return -1; - } - } - } - } - - return ff_mpeg4_pred_dc(s, n, level, dir_ptr, 0); -} - -/** - * decodes a block. - * @return <0 if an error occurred - */ -static inline int mpeg4_decode_block(MpegEncContext * s, DCTELEM * block, - int n, int coded, int intra, int rvlc) -{ - int level, i, last, run; - int dc_pred_dir; - RLTable * rl; - RL_VLC_ELEM * rl_vlc; - const uint8_t * scan_table; - int qmul, qadd; - - //Note intra & rvlc should be optimized away if this is inlined - - if(intra) { - if(s->use_intra_dc_vlc){ - /* DC coef */ - if(s->partitioned_frame){ - level = s->dc_val[0][ s->block_index[n] ]; - if(n<4) level= FASTDIV((level + (s->y_dc_scale>>1)), s->y_dc_scale); - else level= FASTDIV((level + (s->c_dc_scale>>1)), s->c_dc_scale); - dc_pred_dir= (s->pred_dir_table[s->mb_x + s->mb_y*s->mb_stride]<<n)&32; - }else{ - level = mpeg4_decode_dc(s, n, &dc_pred_dir); - if (level < 0) - return -1; - } - block[0] = level; - i = 0; - }else{ - i = -1; - ff_mpeg4_pred_dc(s, n, 0, &dc_pred_dir, 0); - } - if (!coded) - goto not_coded; - - if(rvlc){ - rl = &rvlc_rl_intra; - rl_vlc = rvlc_rl_intra.rl_vlc[0]; - }else{ - rl = &rl_intra; - rl_vlc = rl_intra.rl_vlc[0]; - } - if (s->ac_pred) { - if (dc_pred_dir == 0) - scan_table = s->intra_v_scantable.permutated; /* left */ - else - scan_table = s->intra_h_scantable.permutated; /* top */ - } else { - scan_table = s->intra_scantable.permutated; - } - qmul=1; - qadd=0; - } else { - i = -1; - if (!coded) { - s->block_last_index[n] = i; - return 0; - } - if(rvlc) rl = &rvlc_rl_inter; - else rl = &rl_inter; - - scan_table = s->intra_scantable.permutated; - - if(s->mpeg_quant){ - qmul=1; - qadd=0; - if(rvlc){ - rl_vlc = rvlc_rl_inter.rl_vlc[0]; - }else{ - rl_vlc = rl_inter.rl_vlc[0]; - } - }else{ - qmul = s->qscale << 1; - qadd = (s->qscale - 1) | 1; - if(rvlc){ - rl_vlc = rvlc_rl_inter.rl_vlc[s->qscale]; - }else{ - rl_vlc = rl_inter.rl_vlc[s->qscale]; - } - } - } - { - OPEN_READER(re, &s->gb); - for(;;) { - UPDATE_CACHE(re, &s->gb); - GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0); - if (level==0) { - /* escape */ - if(rvlc){ - if(SHOW_UBITS(re, &s->gb, 1)==0){ - av_log(s->avctx, AV_LOG_ERROR, "1. marker bit missing in rvlc esc\n"); - return -1; - }; SKIP_CACHE(re, &s->gb, 1); - - last= SHOW_UBITS(re, &s->gb, 1); SKIP_CACHE(re, &s->gb, 1); - run= SHOW_UBITS(re, &s->gb, 6); LAST_SKIP_CACHE(re, &s->gb, 6); - SKIP_COUNTER(re, &s->gb, 1+1+6); - UPDATE_CACHE(re, &s->gb); - - if(SHOW_UBITS(re, &s->gb, 1)==0){ - av_log(s->avctx, AV_LOG_ERROR, "2. marker bit missing in rvlc esc\n"); - return -1; - }; SKIP_CACHE(re, &s->gb, 1); - - level= SHOW_UBITS(re, &s->gb, 11); SKIP_CACHE(re, &s->gb, 11); - - if(SHOW_UBITS(re, &s->gb, 5)!=0x10){ - av_log(s->avctx, AV_LOG_ERROR, "reverse esc missing\n"); - return -1; - }; SKIP_CACHE(re, &s->gb, 5); - - level= level * qmul + qadd; - level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); LAST_SKIP_CACHE(re, &s->gb, 1); - SKIP_COUNTER(re, &s->gb, 1+11+5+1); - - i+= run + 1; - if(last) i+=192; - }else{ - int cache; - cache= GET_CACHE(re, &s->gb); - - if(IS_3IV1) - cache ^= 0xC0000000; - - if (cache&0x80000000) { - if (cache&0x40000000) { - /* third escape */ - SKIP_CACHE(re, &s->gb, 2); - last= SHOW_UBITS(re, &s->gb, 1); SKIP_CACHE(re, &s->gb, 1); - run= SHOW_UBITS(re, &s->gb, 6); LAST_SKIP_CACHE(re, &s->gb, 6); - SKIP_COUNTER(re, &s->gb, 2+1+6); - UPDATE_CACHE(re, &s->gb); - - if(IS_3IV1){ - level= SHOW_SBITS(re, &s->gb, 12); LAST_SKIP_BITS(re, &s->gb, 12); - }else{ - if(SHOW_UBITS(re, &s->gb, 1)==0){ - av_log(s->avctx, AV_LOG_ERROR, "1. marker bit missing in 3. esc\n"); - return -1; - }; SKIP_CACHE(re, &s->gb, 1); - - level= SHOW_SBITS(re, &s->gb, 12); SKIP_CACHE(re, &s->gb, 12); - - if(SHOW_UBITS(re, &s->gb, 1)==0){ - av_log(s->avctx, AV_LOG_ERROR, "2. marker bit missing in 3. esc\n"); - return -1; - }; LAST_SKIP_CACHE(re, &s->gb, 1); - - SKIP_COUNTER(re, &s->gb, 1+12+1); - } - -#if 0 - if(s->error_recognition >= FF_ER_COMPLIANT){ - const int abs_level= FFABS(level); - if(abs_level<=MAX_LEVEL && run<=MAX_RUN){ - const int run1= run - rl->max_run[last][abs_level] - 1; - if(abs_level <= rl->max_level[last][run]){ - av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, vlc encoding possible\n"); - return -1; - } - if(s->error_recognition > FF_ER_COMPLIANT){ - if(abs_level <= rl->max_level[last][run]*2){ - av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 1 encoding possible\n"); - return -1; - } - if(run1 >= 0 && abs_level <= rl->max_level[last][run1]){ - av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 2 encoding possible\n"); - return -1; - } - } - } - } -#endif - if (level>0) level= level * qmul + qadd; - else level= level * qmul - qadd; - - if((unsigned)(level + 2048) > 4095){ - if(s->error_recognition > FF_ER_COMPLIANT){ - if(level > 2560 || level<-2560){ - av_log(s->avctx, AV_LOG_ERROR, "|level| overflow in 3. esc, qp=%d\n", s->qscale); - return -1; - } - } - level= level<0 ? -2048 : 2047; - } - - i+= run + 1; - if(last) i+=192; - } else { - /* second escape */ -#if MIN_CACHE_BITS < 20 - LAST_SKIP_BITS(re, &s->gb, 2); - UPDATE_CACHE(re, &s->gb); -#else - SKIP_BITS(re, &s->gb, 2); -#endif - GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1); - i+= run + rl->max_run[run>>7][level/qmul] +1; //FIXME opt indexing - level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); - LAST_SKIP_BITS(re, &s->gb, 1); - } - } else { - /* first escape */ -#if MIN_CACHE_BITS < 19 - LAST_SKIP_BITS(re, &s->gb, 1); - UPDATE_CACHE(re, &s->gb); -#else - SKIP_BITS(re, &s->gb, 1); -#endif - GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1); - i+= run; - level = level + rl->max_level[run>>7][(run-1)&63] * qmul;//FIXME opt indexing - level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); - LAST_SKIP_BITS(re, &s->gb, 1); - } - } - } else { - i+= run; - level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); - LAST_SKIP_BITS(re, &s->gb, 1); - } - if (i > 62){ - i-= 192; - if(i&(~63)){ - av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y); - return -1; - } - - block[scan_table[i]] = level; - break; - } - - block[scan_table[i]] = level; - } - CLOSE_READER(re, &s->gb); - } - not_coded: - if (intra) { - if(!s->use_intra_dc_vlc){ - block[0] = ff_mpeg4_pred_dc(s, n, block[0], &dc_pred_dir, 0); - - i -= i>>31; //if(i == -1) i=0; - } - - mpeg4_pred_ac(s, block, n, dc_pred_dir); - if (s->ac_pred) { - i = 63; /* XXX: not optimal */ - } - } - s->block_last_index[n] = i; - return 0; -} - /* most is hardcoded. should extend to handle all h263 streams */ int h263_decode_picture_header(MpegEncContext *s) { @@ -5254,196 +5437,6 @@ int h263_decode_picture_header(MpegEncContext *s) return 0; } -static void mpeg4_decode_sprite_trajectory(MpegEncContext * s, GetBitContext *gb) -{ - 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, w3, h3; - int alpha=0, beta=0; - int w= s->width; - int h= s->height; - int min_ab; - - for(i=0; i<s->num_sprite_warping_points; i++){ - int length; - int x=0, y=0; - - length= get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3); - if(length){ - x= get_xbits(gb, length); - } - if(!(s->divx_version==500 && s->divx_build==413)) skip_bits1(gb); /* marker bit */ - - length= get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3); - if(length){ - y=get_xbits(gb, length); - } - skip_bits1(gb); /* marker bit */ - s->sprite_traj[i][0]= d[i][0]= x; - s->sprite_traj[i][1]= d[i][1]= y; - } - for(; i<4; i++) - s->sprite_traj[i][0]= s->sprite_traj[i][1]= 0; - - 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 isn't used for GMC - if(s->divx_version==500 && s->divx_build==413){ - sprite_ref[0][0]= a*vop_ref[0][0] + d[0][0]; - sprite_ref[0][1]= a*vop_ref[0][1] + d[0][1]; - sprite_ref[1][0]= a*vop_ref[1][0] + d[0][0] + d[1][0]; - sprite_ref[1][1]= a*vop_ref[1][1] + d[0][1] + d[1][1]; - sprite_ref[2][0]= a*vop_ref[2][0] + d[0][0] + d[2][0]; - sprite_ref[2][1]= a*vop_ref[2][1] + d[0][1] + d[2][1]; - } else { - 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 - virtual_ref[0][0]= 16*(vop_ref[0][0] + w2) - + ROUNDED_DIV(((w - w2)*(r*sprite_ref[0][0] - 16*vop_ref[0][0]) + w2*(r*sprite_ref[1][0] - 16*vop_ref[1][0])),w); - virtual_ref[0][1]= 16*vop_ref[0][1] - + ROUNDED_DIV(((w - w2)*(r*sprite_ref[0][1] - 16*vop_ref[0][1]) + w2*(r*sprite_ref[1][1] - 16*vop_ref[1][1])),w); - virtual_ref[1][0]= 16*vop_ref[0][0] - + ROUNDED_DIV(((h - h2)*(r*sprite_ref[0][0] - 16*vop_ref[0][0]) + h2*(r*sprite_ref[2][0] - 16*vop_ref[2][0])),h); - virtual_ref[1][1]= 16*(vop_ref[0][1] + h2) - + ROUNDED_DIV(((h - h2)*(r*sprite_ref[0][1] - 16*vop_ref[0][1]) + h2*(r*sprite_ref[2][1] - 16*vop_ref[2][1])),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]= a; - s->sprite_delta[0][1]= 0; - s->sprite_delta[1][0]= 0; - s->sprite_delta[1][1]= a; - s->sprite_shift[0]= 0; - s->sprite_shift[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]= a; - s->sprite_delta[0][1]= 0; - s->sprite_delta[1][0]= 0; - s->sprite_delta[1][1]= a; - s->sprite_shift[0]= 0; - s->sprite_shift[1]= 0; - break; - case 2: - 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]) - + (1<<(alpha+rho-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]) - + (1<<(alpha+rho-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 - + (1<<(alpha+rho+1))); - 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 - + (1<<(alpha+rho+1))); - s->sprite_delta[0][0]= (-r*sprite_ref[0][0] + virtual_ref[0][0]); - s->sprite_delta[0][1]= (+r*sprite_ref[0][1] - virtual_ref[0][1]); - s->sprite_delta[1][0]= (-r*sprite_ref[0][1] + virtual_ref[0][1]); - s->sprite_delta[1][1]= (-r*sprite_ref[0][0] + virtual_ref[0][0]); - - s->sprite_shift[0]= alpha+rho; - s->sprite_shift[1]= alpha+rho+2; - break; - case 3: - min_ab= FFMIN(alpha, beta); - w3= w2>>min_ab; - h3= h2>>min_ab; - s->sprite_offset[0][0]= (sprite_ref[0][0]<<(alpha+beta+rho-min_ab)) - + (-r*sprite_ref[0][0] + virtual_ref[0][0])*h3*(-vop_ref[0][0]) - + (-r*sprite_ref[0][0] + virtual_ref[1][0])*w3*(-vop_ref[0][1]) - + (1<<(alpha+beta+rho-min_ab-1)); - s->sprite_offset[0][1]= (sprite_ref[0][1]<<(alpha+beta+rho-min_ab)) - + (-r*sprite_ref[0][1] + virtual_ref[0][1])*h3*(-vop_ref[0][0]) - + (-r*sprite_ref[0][1] + virtual_ref[1][1])*w3*(-vop_ref[0][1]) - + (1<<(alpha+beta+rho-min_ab-1)); - s->sprite_offset[1][0]= (-r*sprite_ref[0][0] + virtual_ref[0][0])*h3*(-2*vop_ref[0][0] + 1) - + (-r*sprite_ref[0][0] + virtual_ref[1][0])*w3*(-2*vop_ref[0][1] + 1) - + 2*w2*h3*r*sprite_ref[0][0] - - 16*w2*h3 - + (1<<(alpha+beta+rho-min_ab+1)); - s->sprite_offset[1][1]= (-r*sprite_ref[0][1] + virtual_ref[0][1])*h3*(-2*vop_ref[0][0] + 1) - + (-r*sprite_ref[0][1] + virtual_ref[1][1])*w3*(-2*vop_ref[0][1] + 1) - + 2*w2*h3*r*sprite_ref[0][1] - - 16*w2*h3 - + (1<<(alpha+beta+rho-min_ab+1)); - s->sprite_delta[0][0]= (-r*sprite_ref[0][0] + virtual_ref[0][0])*h3; - s->sprite_delta[0][1]= (-r*sprite_ref[0][0] + virtual_ref[1][0])*w3; - s->sprite_delta[1][0]= (-r*sprite_ref[0][1] + virtual_ref[0][1])*h3; - s->sprite_delta[1][1]= (-r*sprite_ref[0][1] + virtual_ref[1][1])*w3; - - s->sprite_shift[0]= alpha + beta + rho - min_ab; - s->sprite_shift[1]= alpha + beta + rho - min_ab + 2; - break; - } - /* try to simplify the situation */ - if( s->sprite_delta[0][0] == a<<s->sprite_shift[0] - && s->sprite_delta[0][1] == 0 - && s->sprite_delta[1][0] == 0 - && s->sprite_delta[1][1] == a<<s->sprite_shift[0]) - { - s->sprite_offset[0][0]>>=s->sprite_shift[0]; - s->sprite_offset[0][1]>>=s->sprite_shift[0]; - s->sprite_offset[1][0]>>=s->sprite_shift[1]; - s->sprite_offset[1][1]>>=s->sprite_shift[1]; - s->sprite_delta[0][0]= a; - s->sprite_delta[0][1]= 0; - s->sprite_delta[1][0]= 0; - s->sprite_delta[1][1]= a; - s->sprite_shift[0]= 0; - s->sprite_shift[1]= 0; - s->real_sprite_warping_points=1; - } - else{ - int shift_y= 16 - s->sprite_shift[0]; - int shift_c= 16 - s->sprite_shift[1]; - for(i=0; i<2; i++){ - s->sprite_offset[0][i]<<= shift_y; - s->sprite_offset[1][i]<<= shift_c; - s->sprite_delta[0][i]<<= shift_y; - s->sprite_delta[1][i]<<= shift_y; - s->sprite_shift[i]= 16; - } - s->real_sprite_warping_points= s->num_sprite_warping_points; - } -} - static int mpeg4_decode_gop_header(MpegEncContext * s, GetBitContext *gb){ int hours, minutes, seconds; |