/* * RAW MPEG video demuxer * Copyright (c) 2002-2003 Fabrice Bellard * Copyright (c) 2006 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 "avformat.h" #include "rawdec.h" #define SEQ_START_CODE 0x000001b3 #define GOP_START_CODE 0x000001b8 #define PICTURE_START_CODE 0x00000100 #define SLICE_START_CODE 0x00000101 #define PACK_START_CODE 0x000001ba #define VIDEO_ID 0x000001e0 #define AUDIO_ID 0x000001c0 static int mpegvideo_probe(AVProbeData *p) { uint32_t code= -1; int pic=0, seq=0, slice=0, pspack=0, vpes=0, apes=0; int i; for(i=0; i<p->buf_size; i++){ code = (code<<8) + p->buf[i]; if ((code & 0xffffff00) == 0x100) { switch(code){ case SEQ_START_CODE: seq++; break; case PICTURE_START_CODE: pic++; break; case PACK_START_CODE: pspack++; break; } if (code >= SLICE_START_CODE && code <= 0x1af) slice++; if ((code & 0x1f0) == VIDEO_ID) vpes++; else if((code & 0x1e0) == AUDIO_ID) apes++; } } if(seq && seq*9<=pic*10 && pic*9<=slice*10 && !pspack && !apes) if(vpes) return AVPROBE_SCORE_MAX/8; else return pic>1 ? AVPROBE_SCORE_MAX/2+1 : AVPROBE_SCORE_MAX/4; // +1 for .mpg return 0; } FF_DEF_RAWVIDEO_DEMUXER(mpegvideo, "raw MPEG video", mpegvideo_probe, NULL, CODEC_ID_MPEG1VIDEO)