int ff_mpeg4_decode_picture_header(MpegEncContext * s, GetBitContext *gb) { int startcode, v; /* search next start code */ align_get_bits(gb); startcode = 0xff; for(;;) { v = get_bits(gb, 8); startcode = ((startcode << 8) | v) & 0xffffffff; if(get_bits_count(gb) >= gb->size*8){ if(gb->size==1 && s->divx_version){ printf("frame skip %d\n", gb->size); return FRAME_SKIPED; //divx bug }else return -1; //end of stream } if((startcode&0xFFFFFF00) != 0x100) continue; //no startcode if(s->avctx->debug&FF_DEBUG_STARTCODE){ printf("startcode: %3X ", startcode); if (startcode<=0x11F) printf("Video Object Start"); else if(startcode<=0x12F) printf("Video Object Layer Start"); else if(startcode<=0x13F) printf("Reserved"); else if(startcode<=0x15F) printf("FGS bp start"); else if(startcode<=0x1AF) printf("Reserved"); else if(startcode==0x1B0) printf("Visual Object Seq Start"); else if(startcode==0x1B1) printf("Visual Object Seq End"); else if(startcode==0x1B2) printf("User Data"); else if(startcode==0x1B3) printf("Group of VOP start"); else if(startcode==0x1B4) printf("Video Session Error"); else if(startcode==0x1B5) printf("Visual Object Start"); else if(startcode==0x1B6) printf("Video Object Plane start"); else if(startcode==0x1B7) printf("slice start"); else if(startcode==0x1B8) printf("extension start"); else if(startcode==0x1B9) printf("fgs start"); else if(startcode==0x1BA) printf("FBA Object start"); else if(startcode==0x1BB) printf("FBA Object Plane start"); else if(startcode==0x1BC) printf("Mesh Object start"); else if(startcode==0x1BD) printf("Mesh Object Plane start"); else if(startcode==0x1BE) printf("Still Textutre Object start"); else if(startcode==0x1BF) printf("Textutre Spatial Layer start"); else if(startcode==0x1C0) printf("Textutre SNR Layer start"); else if(startcode==0x1C1) printf("Textutre Tile start"); else if(startcode==0x1C2) printf("Textutre Shape Layer start"); else if(startcode==0x1C3) printf("stuffing start"); else if(startcode<=0x1C5) printf("reserved"); else if(startcode<=0x1FF) printf("System start"); printf(" at %d\n", get_bits_count(gb)); } switch(startcode){ case 0x120: decode_vol_header(s, gb); break; case USER_DATA_STARTCODE: decode_user_data(s, gb); break; case GOP_STARTCODE: mpeg4_decode_gop_header(s, gb); break; case VOP_STARTCODE: return decode_vop_header(s, gb); default: break; } align_get_bits(gb); startcode = 0xff; } }