repositories / deb_ffmpeg.git / blame
| Commit | Line | Data |
|---|---|---|
| 2ba45a60 DM |
1 | /* |
| 2 | * RAW H.263 video demuxer | |
| 3 | * Copyright (c) 2009 Michael Niedermayer <michaelni@gmx.at> | |
| 4 | * | |
| 5 | * This file is part of FFmpeg. | |
| 6 | * | |
| 7 | * FFmpeg is free software; you can redistribute it and/or | |
| 8 | * modify it under the terms of the GNU Lesser General Public | |
| 9 | * License as published by the Free Software Foundation; either | |
| 10 | * version 2.1 of the License, or (at your option) any later version. | |
| 11 | * | |
| 12 | * FFmpeg is distributed in the hope that it will be useful, | |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 15 | * Lesser General Public License for more details. | |
| 16 | * | |
| 17 | * You should have received a copy of the GNU Lesser General Public | |
| 18 | * License along with FFmpeg; if not, write to the Free Software | |
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
| 20 | */ | |
| 21 | ||
| 22 | #include "avformat.h" | |
| 23 | #include "rawdec.h" | |
| 24 | ||
| 25 | static int h263_probe(AVProbeData *p) | |
| 26 | { | |
| 27 | uint64_t code= -1; | |
| 28 | int i; | |
| 29 | int valid_psc=0; | |
| 30 | int invalid_psc=0; | |
| 31 | int res_change=0; | |
| 32 | int src_fmt, last_src_fmt=-1; | |
| 33 | int last_gn=0; | |
| 34 | int tr, last_tr = -1; | |
| 35 | ||
| 36 | for(i=0; i<p->buf_size; i++){ | |
| 37 | code = (code<<8) + p->buf[i]; | |
| 38 | if ((code & 0xfffffc000000) == 0x80000000) { | |
| 39 | tr = (code >> 18) & 0xFF; | |
| 40 | src_fmt= (code>>10)&7; | |
| 41 | if( src_fmt != last_src_fmt | |
| 42 | && last_src_fmt>0 && last_src_fmt<6 | |
| 43 | && src_fmt<6) | |
| 44 | res_change++; | |
| 45 | ||
| 46 | if (tr == last_tr) { | |
| 47 | invalid_psc++; | |
| 48 | continue; | |
| 49 | } | |
| 50 | ||
| 51 | if (src_fmt != 7 && !(code&(1<<9)) && (code&(1<<5))) { | |
| 52 | invalid_psc++; | |
| 53 | continue; | |
| 54 | } | |
| 55 | ||
| 56 | if((code&0x30000)==0x20000 && src_fmt){ | |
| 57 | valid_psc++; | |
| 58 | last_gn=0; | |
| 59 | }else | |
| 60 | invalid_psc++; | |
| 61 | last_src_fmt= src_fmt; | |
| 62 | last_tr = tr; | |
| 63 | } else if((code & 0xffff80000000) == 0x80000000) { | |
| 64 | int gn= (code>>(31-5)) & 0x1F; | |
| 65 | if(gn<last_gn){ | |
| 66 | invalid_psc++; | |
| 67 | }else | |
| 68 | last_gn= gn; | |
| 69 | } | |
| 70 | } | |
| 71 | if(valid_psc > 2*invalid_psc + 2*res_change + 3){ | |
| 72 | return AVPROBE_SCORE_EXTENSION; | |
| 73 | }else if(valid_psc > 2*invalid_psc) | |
| 74 | return AVPROBE_SCORE_EXTENSION / 2; | |
| 75 | return 0; | |
| 76 | } | |
| 77 | ||
| 78 | FF_DEF_RAWVIDEO_DEMUXER(h263, "raw H.263", h263_probe, NULL, AV_CODEC_ID_H263) |