/* * MPEG4 decoder. * Copyright (c) 2000,2001 Fabrice Bellard * Copyright (c) 2002-2010 Michael Niedermayer <michaelni@gmx.at> * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "mpegvideo.h" #include "mpeg4video.h" #include "h263.h" // The defines below define the number of bits that are read at once for // reading vlc values. Changing these may improve speed and data cache needs // be aware though that decreasing them may need the number of stages that is // passed to get_vlc* to be increased. #define SPRITE_TRAJ_VLC_BITS 6 #define DC_VLC_BITS 9 #define MB_TYPE_B_VLC_BITS 4 static VLC dc_lum, dc_chrom; static VLC sprite_trajectory; static VLC mb_type_b_vlc; static const int mb_type_b_map[4]= { MB_TYPE_DIRECT2 | MB_TYPE_L0L1, MB_TYPE_L0L1 | MB_TYPE_16x16, MB_TYPE_L1 | MB_TYPE_16x16, MB_TYPE_L0 | MB_TYPE_16x16, }; /** * predicts the ac. * @param n block index (0-3 are luma, 4-5 are chroma) * @param dir the ac prediction direction */ void mpeg4_pred_ac(MpegEncContext * s, DCTELEM *block, int n, int dir) { int i; int16_t *ac_val, *ac_val1; int8_t * const qscale_table= s->current_picture.qscale_table; /* find prediction */ ac_val = s->ac_val[0][0] + s->block_index[n] * 16; ac_val1 = ac_val; if (s->ac_pred) { if (dir == 0) { const int xy= s->mb_x-1 + s->mb_y*s->mb_stride; /* left prediction */ ac_val -= 16; if(s->mb_x==0 || s->qscale == qscale_table[xy] || n==1 || n==3){ /* same qscale */ for(i=1;i<8;i++) { block[s->dsp.idct_permutation[i<<3]] += ac_val[i]; } }else{ /* different qscale, we must rescale */ for(i=1;i<8;i++) { block[s->dsp.idct_permutation[i<<3]] += ROUNDED_DIV(ac_val[i]*qscale_table[xy], s->qscale); } } } else { const int xy= s->mb_x + s->mb_y*s->mb_stride - s->mb_stride; /* top prediction */ ac_val -= 16 * s->block_wrap[n]; if(s->mb_y==0 || s->qscale == qscale_table[xy] || n==2 || n==3){ /* same qscale */ for(i=1;i<8;i++) { block[s->dsp.idct_permutation[i]] += ac_val[i + 8]; } }else{ /* different qscale, we must rescale */ for(i=1;i<8;i++) { block[s->dsp.idct_permutation[i]] += ROUNDED_DIV(ac_val[i + 8]*qscale_table[xy], s->qscale); } } } } /* left copy */ for(i=1;i<8;i++) ac_val1[i ] = block[s->dsp.idct_permutation[i<<3]]; /* top copy */ for(i=1;i<8;i++) ac_val1[8 + i] = block[s->dsp.idct_permutation[i ]]; } /** * check if the next stuff is a resync marker or the end. * @return 0 if not */ static inline int mpeg4_is_resync(MpegEncContext *s){ int bits_count= get_bits_count(&s->gb); int v= show_bits(&s->gb, 16); if(s->workaround_bugs&FF_BUG_NO_PADDING){ return 0; } while(v<=0xFF){ if(s->pict_type==FF_B_TYPE || (v>>(8-s->pict_type)!=1) || s->partitioned_frame) break; skip_bits(&s->gb, 8+s->pict_type); bits_count+= 8+s->pict_type; v= show_bits(&s->gb, 16); } if(bits_count + 8 >= s->gb.size_in_bits){ v>>=8; v|= 0x7F >> (7-(bits_count&7)); if(v==0x7F) return 1; }else{ if(v == ff_mpeg4_resync_prefix[bits_count&7]){ int len; GetBitContext gb= s->gb; skip_bits(&s->gb, 1); align_get_bits(&s->gb); for(len=0; len<32; len++){ if(get_bits1(&s->gb)) break; } s->gb= gb; if(len>=ff_mpeg4_get_video_packet_prefix_length(s)) return 1; } } 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 */ int mpeg4_decode_video_packet_header(MpegEncContext *s) { int mb_num_bits= av_log2(s->mb_num - 1) + 1; int header_extension=0, mb_num, len; /* is there enough space left for a video packet + header */ if( get_bits_count(&s->gb) > s->gb.size_in_bits-20) return -1; for(len=0; len<32; len++){ if(get_bits1(&s->gb)) break; } if(len!=ff_mpeg4_get_video_packet_prefix_length(s)){ av_log(s->avctx, AV_LOG_ERROR, "marker does not match f_code\n"); return -1; } if(s->shape != RECT_SHAPE){ header_extension= get_bits1(&s->gb); //FIXME more stuff here } mb_num= get_bits(&s->gb, mb_num_bits); if(mb_num>=s->mb_num){ av_log(s->avctx, AV_LOG_ERROR, "illegal mb_num in video packet (%d %d) \n", mb_num, s->mb_num); return -1; } if(s->pict_type == FF_B_TYPE){ while(s->next_picture.mbskip_table[ s->mb_index2xy[ mb_num ] ]) mb_num++; if(mb_num >= s->mb_num) return -1; // slice contains just skipped MBs which where already decoded } s->mb_x= mb_num % s->mb_width; s->mb_y= mb_num / s->mb_width; if(s->shape != BIN_ONLY_SHAPE){ int qscale= get_bits(&s->gb, s->quant_precision); if(qscale) s->chroma_qscale=s->qscale= qscale; } if(s->shape == RECT_SHAPE){ header_extension= get_bits1(&s->gb); } if(header_extension){ int time_increment; int time_incr=0; while (get_bits1(&s->gb) != 0) time_incr++; check_marker(&s->gb, "before time_increment in video packed header"); time_increment= get_bits(&s->gb, s->time_increment_bits); check_marker(&s->gb, "before vop_coding_type in video packed header"); skip_bits(&s->gb, 2); /* vop coding type */ //FIXME not rect stuff here if(s->shape != BIN_ONLY_SHAPE){ skip_bits(&s->gb, 3); /* intra dc vlc threshold */ //FIXME don't just ignore everything if(s->pict_type == FF_S_TYPE && s->vol_sprite_usage==GMC_SPRITE){ mpeg4_decode_sprite_trajectory(s, &s->gb); av_log(s->avctx, AV_LOG_ERROR, "untested\n"); } //FIXME reduced res stuff here if (s->pict_type != FF_I_TYPE) { int f_code = get_bits(&s->gb, 3); /* fcode_for */ if(f_code==0){ av_log(s->avctx, AV_LOG_ERROR, "Error, video packet header damaged (f_code=0)\n"); } } if (s->pict_type == FF_B_TYPE) { int b_code = get_bits(&s->gb, 3); if(b_code==0){ av_log(s->avctx, AV_LOG_ERROR, "Error, video packet header damaged (b_code=0)\n"); } } } } //FIXME new-pred stuff return 0; } /** * gets the average motion vector for a GMC MB. * @param n either 0 for the x component or 1 for y * @return the average MV for a GMC MB */ static inline int get_amv(MpegEncContext *s, int n){ int x, y, mb_v, sum, dx, dy, shift; int len = 1 << (s->f_code + 4); const int a= s->sprite_warping_accuracy; if(s->workaround_bugs & FF_BUG_AMV) len >>= s->quarter_sample; if(s->real_sprite_warping_points==1){ if(s->divx_version==500 && s->divx_build==413) sum= s->sprite_offset[0][n] / (1<<(a - s->quarter_sample)); else sum= RSHIFT(s->sprite_offset[0][n]<<s->quarter_sample, a); }else{ dx= s->sprite_delta[n][0]; dy= s->sprite_delta[n][1]; shift= s->sprite_shift[0]; if(n) dy -= 1<<(shift + a + 1); else dx -= 1<<(shift + a + 1); mb_v= s->sprite_offset[0][n] + dx*s->mb_x*16 + dy*s->mb_y*16; sum=0; for(y=0; y<16; y++){ int v; v= mb_v + dy*y; //XXX FIXME optimize for(x=0; x<16; x++){ sum+= v>>shift; v+= dx; } } sum= RSHIFT(sum, a+8-s->quarter_sample); } if (sum < -len) sum= -len; else if (sum >= len) sum= len-1; return sum; } /** * 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 */ static int mpeg4_decode_partition_a(MpegEncContext *s){ int mb_num; static const int8_t quant_tab[4] = { -1, -2, 1, 2 }; /* decode first partition */ mb_num=0; s->first_slice_line=1; for(; s->mb_y<s->mb_height; s->mb_y++){ ff_init_block_index(s); for(; s->mb_x<s->mb_width; s->mb_x++){ const int xy= s->mb_x + s->mb_y*s->mb_stride; int cbpc; int dir=0; mb_num++; ff_update_block_index(s); if(s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y+1) s->first_slice_line=0; if(s->pict_type==FF_I_TYPE){ int i; do{ if(show_bits_long(&s->gb, 19)==DC_MARKER){ return mb_num-1; } cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2); if (cbpc < 0){ av_log(s->avctx, AV_LOG_ERROR, "cbpc corrupted at %d %d\n", s->mb_x, s->mb_y); return -1; } }while(cbpc == 8); s->cbp_table[xy]= cbpc & 3; s->current_picture.mb_type[xy]= MB_TYPE_INTRA; s->mb_intra = 1; if(cbpc & 4) { ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]); } s->current_picture.qscale_table[xy]= s->qscale; s->mbintra_table[xy]= 1; for(i=0; i<6; i++){ int dc_pred_dir; int dc= mpeg4_decode_dc(s, i, &dc_pred_dir); if(dc < 0){ av_log(s->avctx, AV_LOG_ERROR, "DC corrupted at %d %d\n", s->mb_x, s->mb_y); return -1; } dir<<=1; if(dc_pred_dir) dir|=1; } s->pred_dir_table[xy]= dir; }else{ /* P/S_TYPE */ int mx, my, pred_x, pred_y, bits; int16_t * const mot_val= s->current_picture.motion_val[0][s->block_index[0]]; const int stride= s->b8_stride*2; try_again: bits= show_bits(&s->gb, 17); if(bits==MOTION_MARKER){ return mb_num-1; } skip_bits1(&s->gb); if(bits&0x10000){ /* skip mb */ if(s->pict_type==FF_S_TYPE && s->vol_sprite_usage==GMC_SPRITE){ s->current_picture.mb_type[xy]= MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_GMC | MB_TYPE_L0; mx= get_amv(s, 0); my= get_amv(s, 1); }else{ s->current_picture.mb_type[xy]= MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0; mx=my=0; } mot_val[0 ]= mot_val[2 ]= mot_val[0+stride]= mot_val[2+stride]= mx; mot_val[1 ]= mot_val[3 ]= mot_val[1+stride]= mot_val[3+stride]= my; if(s->mbintra_table[xy]) ff_clean_intra_table_entries(s); continue; } cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2); if (cbpc < 0){ av_log(s->avctx, AV_LOG_ERROR, "cbpc corrupted at %d %d\n", s->mb_x, s->mb_y); return -1; } if(cbpc == 20) goto try_again; s->cbp_table[xy]= cbpc&(8+3); //8 is dquant s->mb_intra = ((cbpc & 4) != 0); if(s->mb_intra){ s->current_picture.mb_type[xy]= MB_TYPE_INTRA; s->mbintra_table[xy]= 1; mot_val[0 ]= mot_val[2 ]= mot_val[0+stride]= mot_val[2+stride]= 0; mot_val[1 ]= mot_val[3 ]= mot_val[1+stride]= mot_val[3+stride]= 0; }else{ if(s->mbintra_table[xy]) ff_clean_intra_table_entries(s); if(s->pict_type==FF_S_TYPE && s->vol_sprite_usage==GMC_SPRITE && (cbpc & 16) == 0) s->mcsel= get_bits1(&s->gb); else s->mcsel= 0; if ((cbpc & 16) == 0) { /* 16x16 motion prediction */ h263_pred_motion(s, 0, 0, &pred_x, &pred_y); if(!s->mcsel){ mx = h263_decode_motion(s, pred_x, s->f_code); if (mx >= 0xffff) return -1; my = h263_decode_motion(s, pred_y, s->f_code); if (my >= 0xffff) return -1; s->current_picture.mb_type[xy]= MB_TYPE_16x16 | MB_TYPE_L0; } else { mx = get_amv(s, 0); my = get_amv(s, 1); s->current_picture.mb_type[xy]= MB_TYPE_16x16 | MB_TYPE_GMC | MB_TYPE_L0; } mot_val[0 ]= mot_val[2 ] = mot_val[0+stride]= mot_val[2+stride]= mx; mot_val[1 ]= mot_val[3 ]= mot_val[1+stride]= mot_val[3+stride]= my; } else { int i; s->current_picture.mb_type[xy]= MB_TYPE_8x8 | MB_TYPE_L0; for(i=0;i<4;i++) { int16_t *mot_val= h263_pred_motion(s, i, 0, &pred_x, &pred_y); mx = h263_decode_motion(s, pred_x, s->f_code); if (mx >= 0xffff) return -1; my = h263_decode_motion(s, pred_y, s->f_code); if (my >= 0xffff) return -1; mot_val[0] = mx; mot_val[1] = my; } } } } } s->mb_x= 0; } return mb_num; } /** * decode second partition. * @return <0 if an error occurred */ static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count){ int mb_num=0; static const int8_t quant_tab[4] = { -1, -2, 1, 2 }; s->mb_x= s->resync_mb_x; s->first_slice_line=1; for(s->mb_y= s->resync_mb_y; mb_num < mb_count; s->mb_y++){ ff_init_block_index(s); for(; mb_num < mb_count && s->mb_x<s->mb_width; s->mb_x++){ const int xy= s->mb_x + s->mb_y*s->mb_stride; mb_num++; ff_update_block_index(s); if(s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y+1) s->first_slice_line=0; if(s->pict_type==FF_I_TYPE){ int ac_pred= get_bits1(&s->gb); int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1); if(cbpy<0){ av_log(s->avctx, AV_LOG_ERROR, "cbpy corrupted at %d %d\n", s->mb_x, s->mb_y); return -1; } s->cbp_table[xy]|= cbpy<<2; s->current_picture.mb_type[xy] |= ac_pred*MB_TYPE_ACPRED; }else{ /* P || S_TYPE */ if(IS_INTRA(s->current_picture.mb_type[xy])){ int dir=0,i; int ac_pred = get_bits1(&s->gb); int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1); if(cbpy<0){ av_log(s->avctx, AV_LOG_ERROR, "I cbpy corrupted at %d %d\n", s->mb_x, s->mb_y); return -1; } if(s->cbp_table[xy] & 8) { ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]); } s->current_picture.qscale_table[xy]= s->qscale; for(i=0; i<6; i++){ int dc_pred_dir; int dc= mpeg4_decode_dc(s, i, &dc_pred_dir); if(dc < 0){ av_log(s->avctx, AV_LOG_ERROR, "DC corrupted at %d %d\n", s->mb_x, s->mb_y); return -1; } dir<<=1; if(dc_pred_dir) dir|=1; } s->cbp_table[xy]&= 3; //remove dquant s->cbp_table[xy]|= cbpy<<2; s->current_picture.mb_type[xy] |= ac_pred*MB_TYPE_ACPRED; s->pred_dir_table[xy]= dir; }else if(IS_SKIP(s->current_picture.mb_type[xy])){ s->current_picture.qscale_table[xy]= s->qscale; s->cbp_table[xy]= 0; }else{ int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1); if(cbpy<0){ av_log(s->avctx, AV_LOG_ERROR, "P cbpy corrupted at %d %d\n", s->mb_x, s->mb_y); return -1; } if(s->cbp_table[xy] & 8) { ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]); } s->current_picture.qscale_table[xy]= s->qscale; s->cbp_table[xy]&= 3; //remove dquant s->cbp_table[xy]|= (cbpy^0xf)<<2; } } } if(mb_num >= mb_count) return 0; s->mb_x= 0; } return 0; } /** * decodes the first & second partition * @return <0 if error (and sets error type in the error_status_table) */ int ff_mpeg4_decode_partitions(MpegEncContext *s) { int mb_num; const int part_a_error= s->pict_type==FF_I_TYPE ? (DC_ERROR|MV_ERROR) : MV_ERROR; const int part_a_end = s->pict_type==FF_I_TYPE ? (DC_END |MV_END) : MV_END; mb_num= mpeg4_decode_partition_a(s); if(mb_num<0){ ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, part_a_error); return -1; } if(s->resync_mb_x + s->resync_mb_y*s->mb_width + mb_num > s->mb_num){ av_log(s->avctx, AV_LOG_ERROR, "slice below monitor ...\n"); ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, part_a_error); return -1; } s->mb_num_left= mb_num; if(s->pict_type==FF_I_TYPE){ while(show_bits(&s->gb, 9) == 1) skip_bits(&s->gb, 9); if(get_bits_long(&s->gb, 19)!=DC_MARKER){ av_log(s->avctx, AV_LOG_ERROR, "marker missing after first I partition at %d %d\n", s->mb_x, s->mb_y); return -1; } }else{ while(show_bits(&s->gb, 10) == 1) skip_bits(&s->gb, 10); if(get_bits(&s->gb, 17)!=MOTION_MARKER){ av_log(s->avctx, AV_LOG_ERROR, "marker missing after first P partition at %d %d\n", s->mb_x, s->mb_y); return -1; } } ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, part_a_end); if( mpeg4_decode_partition_b(s, mb_num) < 0){ if(s->pict_type==FF_P_TYPE) ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, DC_ERROR); return -1; }else{ if(s->pict_type==FF_P_TYPE) ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, DC_END); } return 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 = &ff_mpeg4_rl_intra; rl_vlc = ff_mpeg4_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 = &ff_h263_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 = ff_h263_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 = ff_h263_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 */ static int mpeg4_decode_partitioned_mb(MpegEncContext *s, DCTELEM block[6][64]) { int cbp, mb_type; const int xy= s->mb_x + s->mb_y*s->mb_stride; mb_type= s->current_picture.mb_type[xy]; cbp = s->cbp_table[xy]; s->use_intra_dc_vlc= s->qscale < s->intra_dc_threshold; if(s->current_picture.qscale_table[xy] != s->qscale){ ff_set_qscale(s, s->current_picture.qscale_table[xy] ); } if (s->pict_type == FF_P_TYPE || s->pict_type==FF_S_TYPE) { int i; for(i=0; i<4; i++){ s->mv[0][i][0] = s->current_picture.motion_val[0][ s->block_index[i] ][0]; s->mv[0][i][1] = s->current_picture.motion_val[0][ s->block_index[i] ][1]; } s->mb_intra = IS_INTRA(mb_type); if (IS_SKIP(mb_type)) { /* skip mb */ for(i=0;i<6;i++) s->block_last_index[i] = -1; s->mv_dir = MV_DIR_FORWARD; s->mv_type = MV_TYPE_16X16; if(s->pict_type==FF_S_TYPE && s->vol_sprite_usage==GMC_SPRITE){ s->mcsel=1; s->mb_skipped = 0; }else{ s->mcsel=0; s->mb_skipped = 1; } }else if(s->mb_intra){ s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]); }else if(!s->mb_intra){ // s->mcsel= 0; //FIXME do we need to init that s->mv_dir = MV_DIR_FORWARD; if (IS_8X8(mb_type)) { s->mv_type = MV_TYPE_8X8; } else { s->mv_type = MV_TYPE_16X16; } } } else { /* I-Frame */ s->mb_intra = 1; s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]); } if (!IS_SKIP(mb_type)) { int i; s->dsp.clear_blocks(s->block[0]); /* decode each block */ for (i = 0; i < 6; i++) { if(mpeg4_decode_block(s, block[i], i, cbp&32, s->mb_intra, s->rvlc) < 0){ av_log(s->avctx, AV_LOG_ERROR, "texture corrupted at %d %d %d\n", s->mb_x, s->mb_y, s->mb_intra); return -1; } cbp+=cbp; } } /* per-MB end of slice check */ if(--s->mb_num_left <= 0){ if(mpeg4_is_resync(s)) return SLICE_END; else return SLICE_NOEND; }else{ if(mpeg4_is_resync(s)){ const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1; if(s->cbp_table[xy+delta]) return SLICE_END; } return SLICE_OK; } } static int mpeg4_decode_mb(MpegEncContext *s, DCTELEM block[6][64]) { int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant; int16_t *mot_val; static int8_t quant_tab[4] = { -1, -2, 1, 2 }; const int xy= s->mb_x + s->mb_y * s->mb_stride; assert(s->h263_pred); if (s->pict_type == FF_P_TYPE || s->pict_type==FF_S_TYPE) { do{ if (get_bits1(&s->gb)) { /* skip mb */ s->mb_intra = 0; for(i=0;i<6;i++) s->block_last_index[i] = -1; s->mv_dir = MV_DIR_FORWARD; s->mv_type = MV_TYPE_16X16; if(s->pict_type==FF_S_TYPE && s->vol_sprite_usage==GMC_SPRITE){ s->current_picture.mb_type[xy]= MB_TYPE_SKIP | MB_TYPE_GMC | MB_TYPE_16x16 | MB_TYPE_L0; s->mcsel=1; s->mv[0][0][0]= get_amv(s, 0); s->mv[0][0][1]= get_amv(s, 1); s->mb_skipped = 0; }else{ s->current_picture.mb_type[xy]= MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0; s->mcsel=0; s->mv[0][0][0] = 0; s->mv[0][0][1] = 0; s->mb_skipped = 1; } goto end; } cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2); if (cbpc < 0){ av_log(s->avctx, AV_LOG_ERROR, "cbpc damaged at %d %d\n", s->mb_x, s->mb_y); return -1; } }while(cbpc == 20); s->dsp.clear_blocks(s->block[0]); dquant = cbpc & 8; s->mb_intra = ((cbpc & 4) != 0); if (s->mb_intra) goto intra; if(s->pict_type==FF_S_TYPE && s->vol_sprite_usage==GMC_SPRITE && (cbpc & 16) == 0) s->mcsel= get_bits1(&s->gb); else s->mcsel= 0; cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1) ^ 0x0F; cbp = (cbpc & 3) | (cbpy << 2); if (dquant) { ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]); } if((!s->progressive_sequence) && (cbp || (s->workaround_bugs&FF_BUG_XVID_ILACE))) s->interlaced_dct= get_bits1(&s->gb); s->mv_dir = MV_DIR_FORWARD; if ((cbpc & 16) == 0) { if(s->mcsel){ s->current_picture.mb_type[xy]= MB_TYPE_GMC | MB_TYPE_16x16 | MB_TYPE_L0; /* 16x16 global motion prediction */ s->mv_type = MV_TYPE_16X16; mx= get_amv(s, 0); my= get_amv(s, 1); s->mv[0][0][0] = mx; s->mv[0][0][1] = my; }else if((!s->progressive_sequence) && get_bits1(&s->gb)){ s->current_picture.mb_type[xy]= MB_TYPE_16x8 | MB_TYPE_L0 | MB_TYPE_INTERLACED; /* 16x8 field motion prediction */ s->mv_type= MV_TYPE_FIELD; s->field_select[0][0]= get_bits1(&s->gb); s->field_select[0][1]= get_bits1(&s->gb); h263_pred_motion(s, 0, 0, &pred_x, &pred_y); for(i=0; i<2; i++){ mx = h263_decode_motion(s, pred_x, s->f_code); if (mx >= 0xffff) return -1; my = h263_decode_motion(s, pred_y/2, s->f_code); if (my >= 0xffff) return -1; s->mv[0][i][0] = mx; s->mv[0][i][1] = my; } }else{ s->current_picture.mb_type[xy]= MB_TYPE_16x16 | MB_TYPE_L0; /* 16x16 motion prediction */ s->mv_type = MV_TYPE_16X16; h263_pred_motion(s, 0, 0, &pred_x, &pred_y); mx = h263_decode_motion(s, pred_x, s->f_code); if (mx >= 0xffff) return -1; my = h263_decode_motion(s, pred_y, s->f_code); if (my >= 0xffff) return -1; s->mv[0][0][0] = mx; s->mv[0][0][1] = my; } } else { s->current_picture.mb_type[xy]= MB_TYPE_8x8 | MB_TYPE_L0; s->mv_type = MV_TYPE_8X8; for(i=0;i<4;i++) { mot_val = h263_pred_motion(s, i, 0, &pred_x, &pred_y); mx = h263_decode_motion(s, pred_x, s->f_code); if (mx >= 0xffff) return -1; my = h263_decode_motion(s, pred_y, s->f_code); if (my >= 0xffff) return -1; s->mv[0][i][0] = mx; s->mv[0][i][1] = my; mot_val[0] = mx; mot_val[1] = my; } } } else if(s->pict_type==FF_B_TYPE) { int modb1; // first bit of modb int modb2; // second bit of modb int mb_type; s->mb_intra = 0; //B-frames never contain intra blocks s->mcsel=0; // ... true gmc blocks if(s->mb_x==0){ for(i=0; i<2; i++){ s->last_mv[i][0][0]= s->last_mv[i][0][1]= s->last_mv[i][1][0]= s->last_mv[i][1][1]= 0; } } /* if we skipped it in the future P Frame than skip it now too */ s->mb_skipped= s->next_picture.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]; // Note, skiptab=0 if last was GMC if(s->mb_skipped){ /* skip mb */ for(i=0;i<6;i++) s->block_last_index[i] = -1; s->mv_dir = MV_DIR_FORWARD; s->mv_type = MV_TYPE_16X16; s->mv[0][0][0] = 0; s->mv[0][0][1] = 0; s->mv[1][0][0] = 0; s->mv[1][0][1] = 0; s->current_picture.mb_type[xy]= MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0; goto end; } modb1= get_bits1(&s->gb); if(modb1){ mb_type= MB_TYPE_DIRECT2 | MB_TYPE_SKIP | MB_TYPE_L0L1; //like MB_TYPE_B_DIRECT but no vectors coded cbp=0; }else{ modb2= get_bits1(&s->gb); mb_type= get_vlc2(&s->gb, mb_type_b_vlc.table, MB_TYPE_B_VLC_BITS, 1); if(mb_type<0){ av_log(s->avctx, AV_LOG_ERROR, "illegal MB_type\n"); return -1; } mb_type= mb_type_b_map[ mb_type ]; if(modb2) cbp= 0; else{ s->dsp.clear_blocks(s->block[0]); cbp= get_bits(&s->gb, 6); } if ((!IS_DIRECT(mb_type)) && cbp) { if(get_bits1(&s->gb)){ ff_set_qscale(s, s->qscale + get_bits1(&s->gb)*4 - 2); } } if(!s->progressive_sequence){ if(cbp) s->interlaced_dct= get_bits1(&s->gb); if(!IS_DIRECT(mb_type) && get_bits1(&s->gb)){ mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED; mb_type &= ~MB_TYPE_16x16; if(USES_LIST(mb_type, 0)){ s->field_select[0][0]= get_bits1(&s->gb); s->field_select[0][1]= get_bits1(&s->gb); } if(USES_LIST(mb_type, 1)){ s->field_select[1][0]= get_bits1(&s->gb); s->field_select[1][1]= get_bits1(&s->gb); } } } s->mv_dir = 0; if((mb_type & (MB_TYPE_DIRECT2|MB_TYPE_INTERLACED)) == 0){ s->mv_type= MV_TYPE_16X16; if(USES_LIST(mb_type, 0)){ s->mv_dir = MV_DIR_FORWARD; mx = h263_decode_motion(s, s->last_mv[0][0][0], s->f_code); my = h263_decode_motion(s, s->last_mv[0][0][1], s->f_code); s->last_mv[0][1][0]= s->last_mv[0][0][0]= s->mv[0][0][0] = mx; s->last_mv[0][1][1]= s->last_mv[0][0][1]= s->mv[0][0][1] = my; } if(USES_LIST(mb_type, 1)){ s->mv_dir |= MV_DIR_BACKWARD; mx = h263_decode_motion(s, s->last_mv[1][0][0], s->b_code); my = h263_decode_motion(s, s->last_mv[1][0][1], s->b_code); s->last_mv[1][1][0]= s->last_mv[1][0][0]= s->mv[1][0][0] = mx; s->last_mv[1][1][1]= s->last_mv[1][0][1]= s->mv[1][0][1] = my; } }else if(!IS_DIRECT(mb_type)){ s->mv_type= MV_TYPE_FIELD; if(USES_LIST(mb_type, 0)){ s->mv_dir = MV_DIR_FORWARD; for(i=0; i<2; i++){ mx = h263_decode_motion(s, s->last_mv[0][i][0] , s->f_code); my = h263_decode_motion(s, s->last_mv[0][i][1]/2, s->f_code); s->last_mv[0][i][0]= s->mv[0][i][0] = mx; s->last_mv[0][i][1]= (s->mv[0][i][1] = my)*2; } } if(USES_LIST(mb_type, 1)){ s->mv_dir |= MV_DIR_BACKWARD; for(i=0; i<2; i++){ mx = h263_decode_motion(s, s->last_mv[1][i][0] , s->b_code); my = h263_decode_motion(s, s->last_mv[1][i][1]/2, s->b_code); s->last_mv[1][i][0]= s->mv[1][i][0] = mx; s->last_mv[1][i][1]= (s->mv[1][i][1] = my)*2; } } } } if(IS_DIRECT(mb_type)){ if(IS_SKIP(mb_type)) mx=my=0; else{ mx = h263_decode_motion(s, 0, 1); my = h263_decode_motion(s, 0, 1); } s->mv_dir = MV_DIR_FORWARD | MV_DIR_BACKWARD | MV_DIRECT; mb_type |= ff_mpeg4_set_direct_mv(s, mx, my); } s->current_picture.mb_type[xy]= mb_type; } else { /* I-Frame */ do{ cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2); if (cbpc < 0){ av_log(s->avctx, AV_LOG_ERROR, "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y); return -1; } }while(cbpc == 8); dquant = cbpc & 4; s->mb_intra = 1; intra: s->ac_pred = get_bits1(&s->gb); if(s->ac_pred) s->current_picture.mb_type[xy]= MB_TYPE_INTRA | MB_TYPE_ACPRED; else s->current_picture.mb_type[xy]= MB_TYPE_INTRA; cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1); if(cbpy<0){ av_log(s->avctx, AV_LOG_ERROR, "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y); return -1; } cbp = (cbpc & 3) | (cbpy << 2); s->use_intra_dc_vlc= s->qscale < s->intra_dc_threshold; if (dquant) { ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]); } if(!s->progressive_sequence) s->interlaced_dct= get_bits1(&s->gb); s->dsp.clear_blocks(s->block[0]); /* decode each block */ for (i = 0; i < 6; i++) { if (mpeg4_decode_block(s, block[i], i, cbp&32, 1, 0) < 0) return -1; cbp+=cbp; } goto end; } /* decode each block */ for (i = 0; i < 6; i++) { if (mpeg4_decode_block(s, block[i], i, cbp&32, 0, 0) < 0) return -1; cbp+=cbp; } end: /* per-MB end of slice check */ if(s->codec_id==CODEC_ID_MPEG4){ if(mpeg4_is_resync(s)){ const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1; if(s->pict_type==FF_B_TYPE && s->next_picture.mbskip_table[xy + delta]) return SLICE_OK; return SLICE_END; } } return SLICE_OK; } static int mpeg4_decode_gop_header(MpegEncContext * s, GetBitContext *gb){ int hours, minutes, seconds; hours= get_bits(gb, 5); minutes= get_bits(gb, 6); skip_bits1(gb); seconds= get_bits(gb, 6); s->time_base= seconds + 60*(minutes + 60*hours); skip_bits1(gb); skip_bits1(gb); return 0; } static int decode_vol_header(MpegEncContext *s, GetBitContext *gb){ int width, height, vo_ver_id; /* vol header */ skip_bits(gb, 1); /* random access */ s->vo_type= get_bits(gb, 8); if (get_bits1(gb) != 0) { /* is_ol_id */ vo_ver_id = get_bits(gb, 4); /* vo_ver_id */ skip_bits(gb, 3); /* vo_priority */ } else { vo_ver_id = 1; } s->aspect_ratio_info= get_bits(gb, 4); if(s->aspect_ratio_info == FF_ASPECT_EXTENDED){ s->avctx->sample_aspect_ratio.num= get_bits(gb, 8); // par_width s->avctx->sample_aspect_ratio.den= get_bits(gb, 8); // par_height }else{ s->avctx->sample_aspect_ratio= ff_h263_pixel_aspect[s->aspect_ratio_info]; } if ((s->vol_control_parameters=get_bits1(gb))) { /* vol control parameter */ int chroma_format= get_bits(gb, 2); if(chroma_format!=CHROMA_420){ av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n"); } s->low_delay= get_bits1(gb); if(get_bits1(gb)){ /* vbv parameters */ get_bits(gb, 15); /* first_half_bitrate */ skip_bits1(gb); /* marker */ get_bits(gb, 15); /* latter_half_bitrate */ skip_bits1(gb); /* marker */ get_bits(gb, 15); /* first_half_vbv_buffer_size */ skip_bits1(gb); /* marker */ get_bits(gb, 3); /* latter_half_vbv_buffer_size */ get_bits(gb, 11); /* first_half_vbv_occupancy */ skip_bits1(gb); /* marker */ get_bits(gb, 15); /* latter_half_vbv_occupancy */ skip_bits1(gb); /* marker */ } }else{ // set low delay flag only once the smartest? low delay detection won't be overriden if(s->picture_number==0) s->low_delay=0; } s->shape = get_bits(gb, 2); /* vol shape */ if(s->shape != RECT_SHAPE) av_log(s->avctx, AV_LOG_ERROR, "only rectangular vol supported\n"); if(s->shape == GRAY_SHAPE && vo_ver_id != 1){ av_log(s->avctx, AV_LOG_ERROR, "Gray shape not supported\n"); skip_bits(gb, 4); //video_object_layer_shape_extension } check_marker(gb, "before time_increment_resolution"); s->avctx->time_base.den = get_bits(gb, 16); if(!s->avctx->time_base.den){ av_log(s->avctx, AV_LOG_ERROR, "time_base.den==0\n"); return -1; } s->time_increment_bits = av_log2(s->avctx->time_base.den - 1) + 1; if (s->time_increment_bits < 1) s->time_increment_bits = 1; check_marker(gb, "before fixed_vop_rate"); if (get_bits1(gb) != 0) { /* fixed_vop_rate */ s->avctx->time_base.num = get_bits(gb, s->time_increment_bits); }else s->avctx->time_base.num = 1; s->t_frame=0; if (s->shape != BIN_ONLY_SHAPE) { if (s->shape == RECT_SHAPE) { skip_bits1(gb); /* marker */ width = get_bits(gb, 13); skip_bits1(gb); /* marker */ height = get_bits(gb, 13); skip_bits1(gb); /* marker */ if(width && height && !(s->width && s->codec_tag == AV_RL32("MP4S"))){ /* they should be non zero but who knows ... */ s->width = width; s->height = height; } } s->progressive_sequence= s->progressive_frame= get_bits1(gb)^1; s->interlaced_dct=0; if(!get_bits1(gb) && (s->avctx->debug & FF_DEBUG_PICT_INFO)) av_log(s->avctx, AV_LOG_INFO, "MPEG4 OBMC not supported (very likely buggy encoder)\n"); /* OBMC Disable */ if (vo_ver_id == 1) { s->vol_sprite_usage = get_bits1(gb); /* vol_sprite_usage */ } else { s->vol_sprite_usage = get_bits(gb, 2); /* vol_sprite_usage */ } if(s->vol_sprite_usage==STATIC_SPRITE) av_log(s->avctx, AV_LOG_ERROR, "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(gb, 13); skip_bits1(gb); /* marker */ s->sprite_height= get_bits(gb, 13); skip_bits1(gb); /* marker */ s->sprite_left = get_bits(gb, 13); skip_bits1(gb); /* marker */ s->sprite_top = get_bits(gb, 13); skip_bits1(gb); /* marker */ } s->num_sprite_warping_points= get_bits(gb, 6); if(s->num_sprite_warping_points > 3){ av_log(s->avctx, AV_LOG_ERROR, "%d sprite_warping_points\n", s->num_sprite_warping_points); s->num_sprite_warping_points= 0; return -1; } s->sprite_warping_accuracy = get_bits(gb, 2); s->sprite_brightness_change= get_bits1(gb); if(s->vol_sprite_usage==STATIC_SPRITE) s->low_latency_sprite= get_bits1(gb); } // FIXME sadct disable bit if verid!=1 && shape not rect if (get_bits1(gb) == 1) { /* not_8_bit */ s->quant_precision = get_bits(gb, 4); /* quant_precision */ if(get_bits(gb, 4)!=8) av_log(s->avctx, AV_LOG_ERROR, "N-bit not supported\n"); /* bits_per_pixel */ if(s->quant_precision!=5) av_log(s->avctx, AV_LOG_ERROR, "quant precision %d\n", s->quant_precision); } else { s->quant_precision = 5; } // FIXME a bunch of grayscale shape things if((s->mpeg_quant=get_bits1(gb))){ /* vol_quant_type */ int i, v; /* load default matrixes */ for(i=0; i<64; i++){ int j= s->dsp.idct_permutation[i]; v= ff_mpeg4_default_intra_matrix[i]; s->intra_matrix[j]= v; s->chroma_intra_matrix[j]= v; v= ff_mpeg4_default_non_intra_matrix[i]; s->inter_matrix[j]= v; s->chroma_inter_matrix[j]= v; } /* load custom intra matrix */ if(get_bits1(gb)){ int last=0; for(i=0; i<64; i++){ int j; v= get_bits(gb, 8); if(v==0) break; last= v; j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ]; s->intra_matrix[j]= v; s->chroma_intra_matrix[j]= v; } /* replicate last value */ for(; i<64; i++){ int j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ]; s->intra_matrix[j]= last; s->chroma_intra_matrix[j]= last; } } /* load custom non intra matrix */ if(get_bits1(gb)){ int last=0; for(i=0; i<64; i++){ int j; v= get_bits(gb, 8); if(v==0) break; last= v; j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ]; s->inter_matrix[j]= v; s->chroma_inter_matrix[j]= v; } /* replicate last value */ for(; i<64; i++){ int j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ]; s->inter_matrix[j]= last; s->chroma_inter_matrix[j]= last; } } // FIXME a bunch of grayscale shape things } if(vo_ver_id != 1) s->quarter_sample= get_bits1(gb); else s->quarter_sample=0; if(!get_bits1(gb)){ int pos= get_bits_count(gb); int estimation_method= get_bits(gb, 2); if(estimation_method<2){ if(!get_bits1(gb)){ s->cplx_estimation_trash_i += 8*get_bits1(gb); //opaque s->cplx_estimation_trash_i += 8*get_bits1(gb); //transparent s->cplx_estimation_trash_i += 8*get_bits1(gb); //intra_cae s->cplx_estimation_trash_i += 8*get_bits1(gb); //inter_cae s->cplx_estimation_trash_i += 8*get_bits1(gb); //no_update s->cplx_estimation_trash_i += 8*get_bits1(gb); //upampling } if(!get_bits1(gb)){ s->cplx_estimation_trash_i += 8*get_bits1(gb); //intra_blocks s->cplx_estimation_trash_p += 8*get_bits1(gb); //inter_blocks s->cplx_estimation_trash_p += 8*get_bits1(gb); //inter4v_blocks s->cplx_estimation_trash_i += 8*get_bits1(gb); //not coded blocks } if(!check_marker(gb, "in complexity estimation part 1")){ skip_bits_long(gb, pos - get_bits_count(gb)); goto no_cplx_est; } if(!get_bits1(gb)){ s->cplx_estimation_trash_i += 8*get_bits1(gb); //dct_coeffs s->cplx_estimation_trash_i += 8*get_bits1(gb); //dct_lines s->cplx_estimation_trash_i += 8*get_bits1(gb); //vlc_syms s->cplx_estimation_trash_i += 4*get_bits1(gb); //vlc_bits } if(!get_bits1(gb)){ s->cplx_estimation_trash_p += 8*get_bits1(gb); //apm s->cplx_estimation_trash_p += 8*get_bits1(gb); //npm s->cplx_estimation_trash_b += 8*get_bits1(gb); //interpolate_mc_q s->cplx_estimation_trash_p += 8*get_bits1(gb); //forwback_mc_q s->cplx_estimation_trash_p += 8*get_bits1(gb); //halfpel2 s->cplx_estimation_trash_p += 8*get_bits1(gb); //halfpel4 } if(!check_marker(gb, "in complexity estimation part 2")){ skip_bits_long(gb, pos - get_bits_count(gb)); goto no_cplx_est; } if(estimation_method==1){ s->cplx_estimation_trash_i += 8*get_bits1(gb); //sadct s->cplx_estimation_trash_p += 8*get_bits1(gb); //qpel } }else av_log(s->avctx, AV_LOG_ERROR, "Invalid Complexity estimation method %d\n", estimation_method); }else{ no_cplx_est: s->cplx_estimation_trash_i= s->cplx_estimation_trash_p= s->cplx_estimation_trash_b= 0; } s->resync_marker= !get_bits1(gb); /* resync_marker_disabled */ s->data_partitioning= get_bits1(gb); if(s->data_partitioning){ s->rvlc= get_bits1(gb); } if(vo_ver_id != 1) { s->new_pred= get_bits1(gb); if(s->new_pred){ av_log(s->avctx, AV_LOG_ERROR, "new pred not supported\n"); skip_bits(gb, 2); /* requested upstream message type */ skip_bits1(gb); /* newpred segment type */ } s->reduced_res_vop= get_bits1(gb); if(s->reduced_res_vop) av_log(s->avctx, AV_LOG_ERROR, "reduced resolution VOP not supported\n"); } else{ s->new_pred=0; s->reduced_res_vop= 0; } s->scalability= get_bits1(gb); if (s->scalability) { GetBitContext bak= *gb; int ref_layer_id; int ref_layer_sampling_dir; int h_sampling_factor_n; int h_sampling_factor_m; int v_sampling_factor_n; int v_sampling_factor_m; s->hierachy_type= get_bits1(gb); ref_layer_id= get_bits(gb, 4); ref_layer_sampling_dir= get_bits1(gb); h_sampling_factor_n= get_bits(gb, 5); h_sampling_factor_m= get_bits(gb, 5); v_sampling_factor_n= get_bits(gb, 5); v_sampling_factor_m= get_bits(gb, 5); s->enhancement_type= get_bits1(gb); if( h_sampling_factor_n==0 || h_sampling_factor_m==0 || v_sampling_factor_n==0 || v_sampling_factor_m==0){ /* illegal scalability header (VERY broken encoder), * trying to workaround */ s->scalability=0; *gb= bak; }else av_log(s->avctx, AV_LOG_ERROR, "scalability not supported\n"); // bin shape stuff FIXME } } return 0; } /** * decodes the user data stuff in the header. * Also initializes divx/xvid/lavc_version/build. */ static int decode_user_data(MpegEncContext *s, GetBitContext *gb){ char buf[256]; int i; int e; int ver = 0, build = 0, ver2 = 0, ver3 = 0; char last; for(i=0; i<255 && get_bits_count(gb) < gb->size_in_bits; i++){ if(show_bits(gb, 23) == 0) break; buf[i]= get_bits(gb, 8); } buf[i]=0; /* divx detection */ e=sscanf(buf, "DivX%dBuild%d%c", &ver, &build, &last); if(e<2) e=sscanf(buf, "DivX%db%d%c", &ver, &build, &last); if(e>=2){ s->divx_version= ver; s->divx_build= build; s->divx_packed= e==3 && last=='p'; if(s->divx_packed && !s->showed_packed_warning) { av_log(s->avctx, AV_LOG_WARNING, "Invalid and inefficient vfw-avi packed B frames detected\n"); s->showed_packed_warning=1; } } /* ffmpeg detection */ e=sscanf(buf, "FFmpe%*[^b]b%d", &build)+3; if(e!=4) e=sscanf(buf, "FFmpeg v%d.%d.%d / libavcodec build: %d", &ver, &ver2, &ver3, &build); if(e!=4){ e=sscanf(buf, "Lavc%d.%d.%d", &ver, &ver2, &ver3)+1; if (e>1) build= (ver<<16) + (ver2<<8) + ver3; } if(e!=4){ if(strcmp(buf, "ffmpeg")==0){ s->lavc_build= 4600; } } if(e==4){ s->lavc_build= build; } /* Xvid detection */ e=sscanf(buf, "XviD%d", &build); if(e==1){ s->xvid_build= build; } return 0; } static int decode_vop_header(MpegEncContext *s, GetBitContext *gb){ int time_incr, time_increment; s->pict_type = get_bits(gb, 2) + FF_I_TYPE; /* pict type: I = 0 , P = 1 */ if(s->pict_type==FF_B_TYPE && s->low_delay && s->vol_control_parameters==0 && !(s->flags & CODEC_FLAG_LOW_DELAY)){ av_log(s->avctx, AV_LOG_ERROR, "low_delay flag incorrectly, clearing it\n"); s->low_delay=0; } s->partitioned_frame= s->data_partitioning && s->pict_type!=FF_B_TYPE; if(s->partitioned_frame) s->decode_mb= mpeg4_decode_partitioned_mb; else s->decode_mb= mpeg4_decode_mb; time_incr=0; while (get_bits1(gb) != 0) time_incr++; check_marker(gb, "before time_increment"); if(s->time_increment_bits==0 || !(show_bits(gb, s->time_increment_bits+1)&1)){ av_log(s->avctx, AV_LOG_ERROR, "hmm, seems the headers are not complete, trying to guess time_increment_bits\n"); for(s->time_increment_bits=1 ;s->time_increment_bits<16; s->time_increment_bits++){ if ( s->pict_type == FF_P_TYPE || (s->pict_type == FF_S_TYPE && s->vol_sprite_usage==GMC_SPRITE)) { if((show_bits(gb, s->time_increment_bits+6)&0x37) == 0x30) break; }else if((show_bits(gb, s->time_increment_bits+5)&0x1F) == 0x18) break; } av_log(s->avctx, AV_LOG_ERROR, "my guess is %d bits ;)\n",s->time_increment_bits); } if(IS_3IV1) time_increment= get_bits1(gb); //FIXME investigate further else time_increment= get_bits(gb, s->time_increment_bits); if(s->pict_type!=FF_B_TYPE){ s->last_time_base= s->time_base; s->time_base+= time_incr; s->time= s->time_base*s->avctx->time_base.den + time_increment; if(s->workaround_bugs&FF_BUG_UMP4){ if(s->time < s->last_non_b_time){ /* header is not mpeg-4-compatible, broken encoder, * trying to workaround */ s->time_base++; s->time+= s->avctx->time_base.den; } } s->pp_time= s->time - s->last_non_b_time; s->last_non_b_time= s->time; }else{ s->time= (s->last_time_base + time_incr)*s->avctx->time_base.den + time_increment; s->pb_time= s->pp_time - (s->last_non_b_time - s->time); if(s->pp_time <=s->pb_time || s->pp_time <= s->pp_time - s->pb_time || s->pp_time<=0){ /* messed up order, maybe after seeking? skipping current b-frame */ return FRAME_SKIPPED; } ff_mpeg4_init_direct_mv(s); if(s->t_frame==0) s->t_frame= s->pb_time; if(s->t_frame==0) s->t_frame=1; // 1/0 protection s->pp_field_time= ( ROUNDED_DIV(s->last_non_b_time, s->t_frame) - ROUNDED_DIV(s->last_non_b_time - s->pp_time, s->t_frame))*2; s->pb_field_time= ( ROUNDED_DIV(s->time, s->t_frame) - ROUNDED_DIV(s->last_non_b_time - s->pp_time, s->t_frame))*2; if(!s->progressive_sequence){ if(s->pp_field_time <= s->pb_field_time || s->pb_field_time <= 1) return FRAME_SKIPPED; } } if(s->avctx->time_base.num) s->current_picture_ptr->pts= (s->time + s->avctx->time_base.num/2) / s->avctx->time_base.num; else s->current_picture_ptr->pts= AV_NOPTS_VALUE; if(s->avctx->debug&FF_DEBUG_PTS) av_log(s->avctx, AV_LOG_DEBUG, "MPEG4 PTS: %"PRId64"\n", s->current_picture_ptr->pts); check_marker(gb, "before vop_coded"); /* vop coded */ if (get_bits1(gb) != 1){ if(s->avctx->debug&FF_DEBUG_PICT_INFO) av_log(s->avctx, AV_LOG_ERROR, "vop not coded\n"); return FRAME_SKIPPED; } if (s->shape != BIN_ONLY_SHAPE && ( s->pict_type == FF_P_TYPE || (s->pict_type == FF_S_TYPE && s->vol_sprite_usage==GMC_SPRITE))) { /* rounding type for motion estimation */ s->no_rounding = get_bits1(gb); } else { s->no_rounding = 0; } //FIXME reduced res stuff if (s->shape != RECT_SHAPE) { if (s->vol_sprite_usage != 1 || s->pict_type != FF_I_TYPE) { int width, height, hor_spat_ref, ver_spat_ref; width = get_bits(gb, 13); skip_bits1(gb); /* marker */ height = get_bits(gb, 13); skip_bits1(gb); /* marker */ hor_spat_ref = get_bits(gb, 13); /* hor_spat_ref */ skip_bits1(gb); /* marker */ ver_spat_ref = get_bits(gb, 13); /* ver_spat_ref */ } skip_bits1(gb); /* change_CR_disable */ if (get_bits1(gb) != 0) { skip_bits(gb, 8); /* constant_alpha_value */ } } //FIXME complexity estimation stuff if (s->shape != BIN_ONLY_SHAPE) { skip_bits_long(gb, s->cplx_estimation_trash_i); if(s->pict_type != FF_I_TYPE) skip_bits_long(gb, s->cplx_estimation_trash_p); if(s->pict_type == FF_B_TYPE) skip_bits_long(gb, s->cplx_estimation_trash_b); s->intra_dc_threshold= mpeg4_dc_threshold[ get_bits(gb, 3) ]; if(!s->progressive_sequence){ s->top_field_first= get_bits1(gb); s->alternate_scan= get_bits1(gb); }else s->alternate_scan= 0; } if(s->alternate_scan){ ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_alternate_vertical_scan); ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_alternate_vertical_scan); ff_init_scantable(s->dsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan); ff_init_scantable(s->dsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan); } else{ ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_zigzag_direct); ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_zigzag_direct); ff_init_scantable(s->dsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan); ff_init_scantable(s->dsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan); } if(s->pict_type == FF_S_TYPE && (s->vol_sprite_usage==STATIC_SPRITE || s->vol_sprite_usage==GMC_SPRITE)){ mpeg4_decode_sprite_trajectory(s, gb); if(s->sprite_brightness_change) av_log(s->avctx, AV_LOG_ERROR, "sprite_brightness_change not supported\n"); if(s->vol_sprite_usage==STATIC_SPRITE) av_log(s->avctx, AV_LOG_ERROR, "static sprite not supported\n"); } if (s->shape != BIN_ONLY_SHAPE) { s->chroma_qscale= s->qscale = get_bits(gb, s->quant_precision); if(s->qscale==0){ av_log(s->avctx, AV_LOG_ERROR, "Error, header damaged or not MPEG4 header (qscale=0)\n"); return -1; // makes no sense to continue, as there is nothing left from the image then } if (s->pict_type != FF_I_TYPE) { s->f_code = get_bits(gb, 3); /* fcode_for */ if(s->f_code==0){ av_log(s->avctx, AV_LOG_ERROR, "Error, header damaged or not MPEG4 header (f_code=0)\n"); return -1; // makes no sense to continue, as the MV decoding will break very quickly } }else s->f_code=1; if (s->pict_type == FF_B_TYPE) { s->b_code = get_bits(gb, 3); }else s->b_code=1; if(s->avctx->debug&FF_DEBUG_PICT_INFO){ av_log(s->avctx, AV_LOG_DEBUG, "qp:%d fc:%d,%d %s size:%d pro:%d alt:%d top:%d %spel part:%d resync:%d w:%d a:%d rnd:%d vot:%d%s dc:%d ce:%d/%d/%d\n", s->qscale, s->f_code, s->b_code, s->pict_type == FF_I_TYPE ? "I" : (s->pict_type == FF_P_TYPE ? "P" : (s->pict_type == FF_B_TYPE ? "B" : "S")), gb->size_in_bits,s->progressive_sequence, s->alternate_scan, s->top_field_first, s->quarter_sample ? "q" : "h", s->data_partitioning, s->resync_marker, s->num_sprite_warping_points, s->sprite_warping_accuracy, 1-s->no_rounding, s->vo_type, s->vol_control_parameters ? " VOLC" : " ", s->intra_dc_threshold, s->cplx_estimation_trash_i, s->cplx_estimation_trash_p, s->cplx_estimation_trash_b); } if(!s->scalability){ if (s->shape!=RECT_SHAPE && s->pict_type!=FF_I_TYPE) { skip_bits1(gb); // vop shape coding type } }else{ if(s->enhancement_type){ int load_backward_shape= get_bits1(gb); if(load_backward_shape){ av_log(s->avctx, AV_LOG_ERROR, "load backward shape isn't supported\n"); } } skip_bits(gb, 2); //ref_select_code } } /* detect buggy encoders which don't set the low_delay flag (divx4/xvid/opendivx)*/ // note we cannot detect divx5 without b-frames easily (although it's buggy too) if(s->vo_type==0 && s->vol_control_parameters==0 && s->divx_version==-1 && s->picture_number==0){ av_log(s->avctx, AV_LOG_ERROR, "looks like this file was encoded with (divx4/(old)xvid/opendivx) -> forcing low_delay flag\n"); s->low_delay=1; } s->picture_number++; // better than pic number==0 always ;) s->y_dc_scale_table= ff_mpeg4_y_dc_scale_table; //FIXME add short header support s->c_dc_scale_table= ff_mpeg4_c_dc_scale_table; if(s->workaround_bugs&FF_BUG_EDGE){ s->h_edge_pos= s->width; s->v_edge_pos= s->height; } return 0; } /** * decode mpeg4 headers * @return <0 if no VOP found (or a damaged one) * FRAME_SKIPPED if a not coded VOP is found * 0 if a VOP is found */ int ff_mpeg4_decode_picture_header(MpegEncContext * s, GetBitContext *gb) { int startcode, v; /* search next start code */ align_get_bits(gb); if(s->codec_tag == AV_RL32("WV1F") && show_bits(gb, 24) == 0x575630){ skip_bits(gb, 24); if(get_bits(gb, 8) == 0xF0) goto end; } startcode = 0xff; for(;;) { if(get_bits_count(gb) >= gb->size_in_bits){ if(gb->size_in_bits==8 && (s->divx_version>=0 || s->xvid_build>=0)){ av_log(s->avctx, AV_LOG_ERROR, "frame skip %d\n", gb->size_in_bits); return FRAME_SKIPPED; //divx bug }else return -1; //end of stream } /* use the bits after the test */ v = get_bits(gb, 8); startcode = ((startcode << 8) | v) & 0xffffffff; if((startcode&0xFFFFFF00) != 0x100) continue; //no startcode if(s->avctx->debug&FF_DEBUG_STARTCODE){ av_log(s->avctx, AV_LOG_DEBUG, "startcode: %3X ", startcode); if (startcode<=0x11F) av_log(s->avctx, AV_LOG_DEBUG, "Video Object Start"); else if(startcode<=0x12F) av_log(s->avctx, AV_LOG_DEBUG, "Video Object Layer Start"); else if(startcode<=0x13F) av_log(s->avctx, AV_LOG_DEBUG, "Reserved"); else if(startcode<=0x15F) av_log(s->avctx, AV_LOG_DEBUG, "FGS bp start"); else if(startcode<=0x1AF) av_log(s->avctx, AV_LOG_DEBUG, "Reserved"); else if(startcode==0x1B0) av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq Start"); else if(startcode==0x1B1) av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq End"); else if(startcode==0x1B2) av_log(s->avctx, AV_LOG_DEBUG, "User Data"); else if(startcode==0x1B3) av_log(s->avctx, AV_LOG_DEBUG, "Group of VOP start"); else if(startcode==0x1B4) av_log(s->avctx, AV_LOG_DEBUG, "Video Session Error"); else if(startcode==0x1B5) av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Start"); else if(startcode==0x1B6) av_log(s->avctx, AV_LOG_DEBUG, "Video Object Plane start"); else if(startcode==0x1B7) av_log(s->avctx, AV_LOG_DEBUG, "slice start"); else if(startcode==0x1B8) av_log(s->avctx, AV_LOG_DEBUG, "extension start"); else if(startcode==0x1B9) av_log(s->avctx, AV_LOG_DEBUG, "fgs start"); else if(startcode==0x1BA) av_log(s->avctx, AV_LOG_DEBUG, "FBA Object start"); else if(startcode==0x1BB) av_log(s->avctx, AV_LOG_DEBUG, "FBA Object Plane start"); else if(startcode==0x1BC) av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object start"); else if(startcode==0x1BD) av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object Plane start"); else if(startcode==0x1BE) av_log(s->avctx, AV_LOG_DEBUG, "Still Texture Object start"); else if(startcode==0x1BF) av_log(s->avctx, AV_LOG_DEBUG, "Texture Spatial Layer start"); else if(startcode==0x1C0) av_log(s->avctx, AV_LOG_DEBUG, "Texture SNR Layer start"); else if(startcode==0x1C1) av_log(s->avctx, AV_LOG_DEBUG, "Texture Tile start"); else if(startcode==0x1C2) av_log(s->avctx, AV_LOG_DEBUG, "Texture Shape Layer start"); else if(startcode==0x1C3) av_log(s->avctx, AV_LOG_DEBUG, "stuffing start"); else if(startcode<=0x1C5) av_log(s->avctx, AV_LOG_DEBUG, "reserved"); else if(startcode<=0x1FF) av_log(s->avctx, AV_LOG_DEBUG, "System start"); av_log(s->avctx, AV_LOG_DEBUG, " at %d\n", get_bits_count(gb)); } if(startcode >= 0x120 && startcode <= 0x12F){ if(decode_vol_header(s, gb) < 0) return -1; } else if(startcode == USER_DATA_STARTCODE){ decode_user_data(s, gb); } else if(startcode == GOP_STARTCODE){ mpeg4_decode_gop_header(s, gb); } else if(startcode == VOP_STARTCODE){ break; } align_get_bits(gb); startcode = 0xff; } end: if(s->flags& CODEC_FLAG_LOW_DELAY) s->low_delay=1; s->avctx->has_b_frames= !s->low_delay; return decode_vop_header(s, gb); } static av_cold int decode_init(AVCodecContext *avctx) { MpegEncContext *s = avctx->priv_data; int ret; static int done = 0; s->divx_version= s->divx_build= s->xvid_build= s->lavc_build= -1; if((ret=ff_h263_decode_init(avctx)) < 0) return ret; if (!done) { done = 1; init_rl(&ff_mpeg4_rl_intra, ff_mpeg4_static_rl_table_store[0]); init_rl(&rvlc_rl_inter, ff_mpeg4_static_rl_table_store[1]); init_rl(&rvlc_rl_intra, ff_mpeg4_static_rl_table_store[2]); INIT_VLC_RL(ff_mpeg4_rl_intra, 554); INIT_VLC_RL(rvlc_rl_inter, 1072); INIT_VLC_RL(rvlc_rl_intra, 1072); INIT_VLC_STATIC(&dc_lum, DC_VLC_BITS, 10 /* 13 */, &ff_mpeg4_DCtab_lum[0][1], 2, 1, &ff_mpeg4_DCtab_lum[0][0], 2, 1, 512); INIT_VLC_STATIC(&dc_chrom, DC_VLC_BITS, 10 /* 13 */, &ff_mpeg4_DCtab_chrom[0][1], 2, 1, &ff_mpeg4_DCtab_chrom[0][0], 2, 1, 512); INIT_VLC_STATIC(&sprite_trajectory, SPRITE_TRAJ_VLC_BITS, 15, &sprite_trajectory_tab[0][1], 4, 2, &sprite_trajectory_tab[0][0], 4, 2, 128); INIT_VLC_STATIC(&mb_type_b_vlc, MB_TYPE_B_VLC_BITS, 4, &mb_type_b_tab[0][1], 2, 1, &mb_type_b_tab[0][0], 2, 1, 16); } s->h263_pred = 1; s->low_delay = 0; //default, might be overriden in the vol header during header parsing s->decode_mb= mpeg4_decode_mb; s->time_increment_bits = 4; /* default value for broken headers */ avctx->chroma_sample_location = AVCHROMA_LOC_LEFT; return 0; } AVCodec mpeg4_decoder = { "mpeg4", AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG4, sizeof(MpegEncContext), decode_init, NULL, ff_h263_decode_end, ff_h263_decode_frame, CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY, .flush= ff_mpeg_flush, .max_lowres= 3, .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2"), .pix_fmts= ff_hwaccel_pixfmt_list_420, }; #if CONFIG_MPEG4_VDPAU_DECODER AVCodec mpeg4_vdpau_decoder = { "mpeg4_vdpau", AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG4, sizeof(MpegEncContext), decode_init, NULL, ff_h263_decode_end, ff_h263_decode_frame, CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | CODEC_CAP_HWACCEL_VDPAU, .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2 (VDPAU)"), .pix_fmts= (const enum PixelFormat[]){PIX_FMT_VDPAU_MPEG4, PIX_FMT_NONE}, }; #endif