| /* |
| * 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) |
