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- /*
- * RAW MPEG video demuxer
- * Copyright (c) 2002-2003 Fabrice Bellard
- * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
- *
- * This file is part of Libav.
- *
- * Libav 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.
- *
- * Libav 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 Libav; 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, pes=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 SLICE_START_CODE: slice++; break;
- case PACK_START_CODE: pspack++; break;
- }
- if ((code & 0x1f0) == VIDEO_ID) pes++;
- else if((code & 0x1e0) == AUDIO_ID) pes++;
- }
- }
- if(seq && seq*9<=pic*10 && pic*9<=slice*10 && !pspack && !pes)
- return pic>1 ? AVPROBE_SCORE_EXTENSION + 1 : AVPROBE_SCORE_EXTENSION / 2; // 1 more than .mpg
- return 0;
- }
-
- FF_DEF_RAWVIDEO_DEMUXER(mpegvideo, "raw MPEG video", mpegvideo_probe, NULL, AV_CODEC_ID_MPEG1VIDEO)
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