Windows CE

开发平台：

C/C++

h263.c：源码内容

} else { int ufep; /* H.263v2 */ s->h263_plus = 1; ufep = get_bits(&s->gb, 3); /* Update Full Extended PTYPE */ /* ufep other than 0 and 1 are reserved */ if (ufep == 1) { /* OPPTYPE */ format = get_bits(&s->gb, 3); dprintf("ufep=1, format: %dn", format); s->custom_pcf= get_bits1(&s->gb); s->umvplus = get_bits(&s->gb, 1); /* Unrestricted Motion Vector */ if (get_bits1(&s->gb) != 0) { av_log(s->avctx, AV_LOG_ERROR, "Syntax-based Arithmetic Coding (SAC) not supportedn"); } s->obmc= get_bits1(&s->gb); /* Advanced prediction mode */ s->h263_aic = get_bits1(&s->gb); /* Advanced Intra Coding (AIC) */ s->loop_filter= get_bits1(&s->gb); s->unrestricted_mv = s->umvplus || s->obmc || s->loop_filter; s->h263_slice_structured= get_bits1(&s->gb); if (get_bits1(&s->gb) != 0) { av_log(s->avctx, AV_LOG_ERROR, "Reference Picture Selection not supportedn"); } if (get_bits1(&s->gb) != 0) { av_log(s->avctx, AV_LOG_ERROR, "Independent Segment Decoding not supportedn"); } s->alt_inter_vlc= get_bits1(&s->gb); s->modified_quant= get_bits1(&s->gb); if(s->modified_quant) s->chroma_qscale_table= ff_h263_chroma_qscale_table; skip_bits(&s->gb, 1); /* Prevent start code emulation */ skip_bits(&s->gb, 3); /* Reserved */ } else if (ufep != 0) { av_log(s->avctx, AV_LOG_ERROR, "Bad UFEP type (%d)n", ufep); return -1; } /* MPPTYPE */ s->pict_type = get_bits(&s->gb, 3); switch(s->pict_type){ case 0: s->pict_type= I_TYPE;break; case 1: s->pict_type= P_TYPE;break; case 3: s->pict_type= B_TYPE;break; case 7: s->pict_type= I_TYPE;break; //ZYGO default: return -1; } skip_bits(&s->gb, 2); s->no_rounding = get_bits1(&s->gb); skip_bits(&s->gb, 4); /* Get the picture dimensions */ if (ufep) { if (format == 6) { /* Custom Picture Format (CPFMT) */ s->aspect_ratio_info = get_bits(&s->gb, 4); dprintf("aspect: %dn", s->aspect_ratio_info); /* aspect ratios: 0 - forbidden 1 - 1:1 2 - 12:11 (CIF 4:3) 3 - 10:11 (525-type 4:3) 4 - 16:11 (CIF 16:9) 5 - 40:33 (525-type 16:9) 6-14 - reserved */ width = (get_bits(&s->gb, 9) + 1) * 4; skip_bits1(&s->gb); height = get_bits(&s->gb, 9) * 4; dprintf("nH.263+ Custom picture: %dx%dn",width,height); if (s->aspect_ratio_info == FF_ASPECT_EXTENDED) { /* aspected dimensions */ s->avctx->sample_aspect_ratio.num= get_bits(&s->gb, 8); s->avctx->sample_aspect_ratio.den= get_bits(&s->gb, 8); }else{ s->avctx->sample_aspect_ratio= pixel_aspect[s->aspect_ratio_info]; } } else { width = h263_format[format][0]; height = h263_format[format][1]; s->avctx->sample_aspect_ratio= _AVRational(12,11); //Picard
} if ((width == 0) || (height == 0)) return -1; s->width = width; s->height = height; if(s->custom_pcf){ int gcd; s->avctx->time_base.den= 1800000; s->avctx->time_base.num= 1000 + get_bits1(&s->gb); s->avctx->time_base.num*= get_bits(&s->gb, 7); if(s->avctx->time_base.num == 0){ av_log(s->avctx, AV_LOG_ERROR, "zero frameraten"); return -1; } gcd= ff_gcd(s->avctx->time_base.den, s->avctx->time_base.num); s->avctx->time_base.den /= gcd; s->avctx->time_base.num /= gcd; // av_log(s->avctx, AV_LOG_DEBUG, "%d/%dn", s->avctx->time_base.den, s->avctx->time_base.num); }else{ s->avctx->time_base= _AVRational(1001, 30000); //Picard
} } if(s->custom_pcf){ skip_bits(&s->gb, 2); //extended Temporal reference } if (ufep) { if (s->umvplus) { if(get_bits1(&s->gb)==0) /* Unlimited Unrestricted Motion Vectors Indicator (UUI) */ skip_bits1(&s->gb); } if(s->h263_slice_structured){ if (get_bits1(&s->gb) != 0) { av_log(s->avctx, AV_LOG_ERROR, "rectangular slices not supportedn"); } if (get_bits1(&s->gb) != 0) { av_log(s->avctx, AV_LOG_ERROR, "unordered slices not supportedn"); } } } s->qscale = get_bits(&s->gb, 5); } s->mb_width = (s->width + 15) / 16; s->mb_height = (s->height + 15) / 16; s->mb_num = s->mb_width * s->mb_height; /* PEI */ while (get_bits1(&s->gb) != 0) { skip_bits(&s->gb, 8); } if(s->h263_slice_structured){ if (get_bits1(&s->gb) != 1) { av_log(s->avctx, AV_LOG_ERROR, "SEPB1 marker missingn"); return -1; } ff_h263_decode_mba(s); if (get_bits1(&s->gb) != 1) { av_log(s->avctx, AV_LOG_ERROR, "SEPB2 marker missingn"); return -1; } } s->f_code = 1; if(s->h263_aic){ s->y_dc_scale_table= s->c_dc_scale_table= ff_aic_dc_scale_table; }else{ s->y_dc_scale_table= s->c_dc_scale_table= ff_mpeg1_dc_scale_table; } if(s->avctx->debug&FF_DEBUG_PICT_INFO){ av_log(s->avctx, AV_LOG_DEBUG, "qp:%d %c size:%d rnd:%d%s%s%s%s%s%s%s%s%s %d/%dn", s->qscale, av_get_pict_type_char(s->pict_type), s->gb.size_in_bits, 1-s->no_rounding, s->obmc ? " AP" : "", s->umvplus ? " UMV" : "", s->h263_long_vectors ? " LONG" : "", s->h263_plus ? " +" : "", s->h263_aic ? " AIC" : "", s->alt_inter_vlc ? " AIV" : "", s->modified_quant ? " MQ" : "", s->loop_filter ? " LOOP" : "", s->h263_slice_structured ? " SS" : "", s->avctx->time_base.den, s->avctx->time_base.num ); } #if 1 if (s->pict_type == I_TYPE && s->avctx->codec_tag == ff_get_fourcc("ZYGO")){ int i,j; for(i=0; i<85; i++) av_log(s->avctx, AV_LOG_DEBUG, "%d", get_bits1(&s->gb)); av_log(s->avctx, AV_LOG_DEBUG, "n"); for(i=0; i<13; i++){ for(j=0; j<3; j++){ int v= get_bits(&s->gb, 8); v |= get_sbits(&s->gb, 8)<<8; av_log(s->avctx, AV_LOG_DEBUG, " %5d", v); } av_log(s->avctx, AV_LOG_DEBUG, "n"); } for(i=0; i<50; i++) av_log(s->avctx, AV_LOG_DEBUG, "%d", get_bits1(&s->gb)); } #endif 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_vlc(gb, &sprite_trajectory); if(length){ x= get_xbits(gb, length); } if(!(s->divx_version==500 && s->divx_build==413)) skip_bits1(gb); /* marker bit */ length= get_vlc(gb, &sprite_trajectory); if(length){ y=get_xbits(gb, length); } skip_bits1(gb); /* marker bit */ //printf("%d %d %d %dn", x, y, i, s->sprite_warping_accuracy); d[i][0]= x; d[i][1]= y; } while((1<<alpha)<w) alpha++; while((1<<beta )<h) beta++; // there seems to be a typo in the mpeg4 std for the definition of w' and h' w2= 1<<alpha; h2= 1<<beta; // Note, the 4th point 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]; //printf("shifts %d %dn", shift_y, shift_c); 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; } #if 0 printf("vop:%d:%d %d:%d %d:%d, sprite:%d:%d %d:%d %d:%d, virtual: %d:%d %d:%dn", vop_ref[0][0], vop_ref[0][1], vop_ref[1][0], vop_ref[1][1], vop_ref[2][0], vop_ref[2][1], sprite_ref[0][0], sprite_ref[0][1], sprite_ref[1][0], sprite_ref[1][1], sprite_ref[2][0], sprite_ref[2][1], virtual_ref[0][0], virtual_ref[0][1], virtual_ref[1][0], virtual_ref[1][1] ); printf("offset: %d:%d , delta: %d %d %d %d, shift %dn", s->sprite_offset[0][0], s->sprite_offset[0][1], s->sprite_delta[0][0], s->sprite_delta[0][1], s->sprite_delta[1][0], s->sprite_delta[1][1], s->sprite_shift[0] ); #endif } 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; } //printf("vo type:%dn",s->vo_type); 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= 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!=1){ av_log(s->avctx, AV_LOG_ERROR, "illegal chroma formatn"); } 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 supportedn"); if(s->shape == GRAY_SHAPE && vo_ver_id != 1){ av_log(s->avctx, AV_LOG_ERROR, "Gray shape not supportedn"); 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==0n"); 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->avctx->codec_tag == ff_get_fourcc("MP4S"))){ /* they should be non zero but who knows ... */ s->width = width; s->height = height; // printf("width/height: %d %dn", width, height); } } s->progressive_sequence= s->progressive_frame= get_bits1(gb)^1; 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 supportedn"); 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); 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 supportedn"); /* bits_per_pixel */ if(s->quant_precision!=5) av_log(s->avctx, AV_LOG_ERROR, "quant precision %dn", 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)) av_log(s->avctx, AV_LOG_ERROR, "Complexity estimation not supportedn"); 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 supportedn"); 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 supportedn"); } 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){ // fprintf(stderr, "illegal scalability header (VERY broken encoder), trying to workaroundn"); s->scalability=0; *gb= bak; }else av_log(s->avctx, AV_LOG_ERROR, "scalability not supportedn"); // bin shape stuff FIXME } } return 0; } /** * decodes the user data stuff in the header. * allso inits 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 && gb->index < 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'; } /* 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; } //printf("User Data: %sn", buf); return 0; } static int decode_vop_header(MpegEncContext *s, GetBitContext *gb){ int time_incr, time_increment; s->pict_type = get_bits(gb, 2) + I_TYPE; /* pict type: I = 0 , P = 1 */ if(s->pict_type==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 itn"); s->low_delay=0; } s->partitioned_frame= s->data_partitioning && s->pict_type!=B_TYPE; if(s->partitioned_frame) s->decode_mb= mpeg4_decode_partitioned_mb; else s->decode_mb= ff_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_bitsn"); for(s->time_increment_bits=1 ;s->time_increment_bits<16; s->time_increment_bits++){ if(show_bits(gb, s->time_increment_bits+1)&1) 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); // printf("%d %Xn", s->time_increment_bits, time_increment); //av_log(s->avctx, AV_LOG_DEBUG, " type:%d modulo_time_base:%d increment:%d t_frame %dn", s->pict_type, time_incr, time_increment, s->t_frame); if(s->pict_type!=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){ // fprintf(stderr, "header is not mpeg4 compatible, broken encoder, trying to workaroundn"); 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){ // printf("messed up order, maybe after seeking? skipping current b framen"); return FRAME_SKIPPED; } 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; } //av_log(s->avctx, AV_LOG_DEBUG, "last nonb %Ld last_base %d time %Ld pp %d pb %d t %d ppf %d pbf %dn", s->last_non_b_time, s->last_time_base, s->time, s->pp_time, s->pb_time, s->t_frame, s->pp_field_time, s->pb_field_time); 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: %Ldn", 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 codedn"); return FRAME_SKIPPED; } //printf("time %d %d %d || %Ld %Ld %Ldn", s->time_increment_bits, s->avctx->time_base.den, s->time_base, //s->time, s->last_non_b_time, s->last_non_b_time - s->pp_time); if (s->shape != BIN_ONLY_SHAPE && ( s->pict_type == P_TYPE || (s->pict_type == 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 != 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) { 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 == 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 supportedn"); if(s->vol_sprite_usage==STATIC_SPRITE) av_log(s->avctx, AV_LOG_ERROR, "static sprite not supportedn"); } 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 != 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 == 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:%dn", s->qscale, s->f_code, s->b_code, s->pict_type == I_TYPE ? "I" : (s->pict_type == P_TYPE ? "P" : (s->pict_type == 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); } if(!s->scalability){ if (s->shape!=RECT_SHAPE && s->pict_type!=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 supportedn"); } } 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==0 && 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 flagn"); 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->avctx->codec_tag == ff_get_fourcc("WV1F") && show_bits(gb, 24) == 0x575630){ skip_bits(gb, 24); if(get_bits(gb, 8) == 0xF0) return decode_vop_header(s, gb); } startcode = 0xff; for(;;) { if(get_bits_count(gb) >= gb->size_in_bits){ if(gb->size_in_bits==8 && (s->divx_version || s->xvid_build)){ av_log(s->avctx, AV_LOG_ERROR, "frame skip %dn", gb->size_in_bits); return FRAME_SKIPPED; //divx bug }else return -1; //end of stream } 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 %dn", 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){ return decode_vop_header(s, gb); } align_get_bits(gb); startcode = 0xff; } } /* don't understand why they choose a different header ! */ int intel_h263_decode_picture_header(MpegEncContext *s) { int format; /* picture header */ if (get_bits_long(&s->gb, 22) != 0x20) { av_log(s->avctx, AV_LOG_ERROR, "Bad picture start coden"); return -1; } s->picture_number = get_bits(&s->gb, 8); /* picture timestamp */ if (get_bits1(&s->gb) != 1) { av_log(s->avctx, AV_LOG_ERROR, "Bad markern"); return -1; /* marker */ } if (get_bits1(&s->gb) != 0) { av_log(s->avctx, AV_LOG_ERROR, "Bad H263 idn"); return -1; /* h263 id */ } skip_bits1(&s->gb); /* split screen off */ skip_bits1(&s->gb); /* camera off */ skip_bits1(&s->gb); /* freeze picture release off */ format = get_bits(&s->gb, 3); if (format != 7) { av_log(s->avctx, AV_LOG_ERROR, "Intel H263 free format not supportedn"); return -1; } s->h263_plus = 0; s->pict_type = I_TYPE + get_bits1(&s->gb); s->unrestricted_mv = get_bits1(&s->gb); s->h263_long_vectors = s->unrestricted_mv; if (get_bits1(&s->gb) != 0) { av_log(s->avctx, AV_LOG_ERROR, "SAC not supportedn"); return -1; /* SAC: off */ } if (get_bits1(&s->gb) != 0) { s->obmc= 1; av_log(s->avctx, AV_LOG_ERROR, "Advanced Prediction Mode not supportedn"); // return -1; /* advanced prediction mode: off */ } if (get_bits1(&s->gb) != 0) { av_log(s->avctx, AV_LOG_ERROR, "PB frame mode no supportedn"); return -1; /* PB frame mode */ } /* skip unknown header garbage */ skip_bits(&s->gb, 41); s->chroma_qscale= s->qscale = get_bits(&s->gb, 5); skip_bits1(&s->gb); /* Continuous Presence Multipoint mode: off */ /* PEI */ while (get_bits1(&s->gb) != 0) { skip_bits(&s->gb, 8); } s->f_code = 1; s->y_dc_scale_table= s->c_dc_scale_table= ff_mpeg1_dc_scale_table; return 0; } int flv_h263_decode_picture_header(MpegEncContext *s) { int format, width, height; /* picture header */ if (get_bits_long(&s->gb, 17) != 1) { av_log(s->avctx, AV_LOG_ERROR, "Bad picture start coden"); return -1; } format = get_bits(&s->gb, 5); if (format != 0 && format != 1) { av_log(s->avctx, AV_LOG_ERROR, "Bad picture formatn"); return -1; } s->h263_flv = format+1; s->picture_number = get_bits(&s->gb, 8); /* picture timestamp */ format = get_bits(&s->gb, 3); switch (format) { case 0: width = get_bits(&s->gb, 8); height = get_bits(&s->gb, 8); break; case 1: width = get_bits(&s->gb, 16); height = get_bits(&s->gb, 16); break; case 2: width = 352; height = 288; break; case 3: width = 176; height = 144; break; case 4: width = 128; height = 96; break; case 5: width = 320; height = 240; break; case 6: width = 160; height = 120; break; default: width = height = 0; break; } if(avcodec_check_dimensions(s->avctx, width, height)) return -1; s->width = width; s->height = height; s->pict_type = I_TYPE + get_bits(&s->gb, 2); s->dropable= s->pict_type > P_TYPE; if (s->dropable) s->pict_type = P_TYPE; skip_bits1(&s->gb); /* deblocking flag */ s->chroma_qscale= s->qscale = get_bits(&s->gb, 5); s->h263_plus = 0; s->unrestricted_mv = 1; s->h263_long_vectors = 0; /* PEI */ while (get_bits1(&s->gb) != 0) { skip_bits(&s->gb, 8); } s->f_code = 1; if(s->avctx->debug & FF_DEBUG_PICT_INFO){ av_log(s->avctx, AV_LOG_DEBUG, "%c esc_type:%d, qp:%d num:%dn", s->dropable ? 'D' : av_get_pict_type_char(s->pict_type), s->h263_flv-1, s->qscale, s->picture_number); } s->y_dc_scale_table= s->c_dc_scale_table= ff_mpeg1_dc_scale_table; return 0; }