repositories / deb_ffmpeg.git / blame
| Commit | Line | Data |
|---|---|---|
| 2ba45a60 DM |
1 | /* |
| 2 | * RAW MPEG video demuxer | |
| 3 | * Copyright (c) 2002-2003 Fabrice Bellard | |
| 4 | * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> | |
| 5 | * | |
| 6 | * This file is part of FFmpeg. | |
| 7 | * | |
| 8 | * FFmpeg is free software; you can redistribute it and/or | |
| 9 | * modify it under the terms of the GNU Lesser General Public | |
| 10 | * License as published by the Free Software Foundation; either | |
| 11 | * version 2.1 of the License, or (at your option) any later version. | |
| 12 | * | |
| 13 | * FFmpeg is distributed in the hope that it will be useful, | |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 16 | * Lesser General Public License for more details. | |
| 17 | * | |
| 18 | * You should have received a copy of the GNU Lesser General Public | |
| 19 | * License along with FFmpeg; if not, write to the Free Software | |
| 20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
| 21 | */ | |
| 22 | ||
| 23 | #include "avformat.h" | |
| 24 | #include "rawdec.h" | |
| 25 | ||
| 26 | #include "libavutil/intreadwrite.h" | |
| 27 | ||
| 28 | #define SEQ_START_CODE 0x000001b3 | |
| 29 | #define GOP_START_CODE 0x000001b8 | |
| 30 | #define PICTURE_START_CODE 0x00000100 | |
| 31 | #define SLICE_START_CODE 0x00000101 | |
| 32 | #define PACK_START_CODE 0x000001ba | |
| 33 | #define VIDEO_ID 0x000001e0 | |
| 34 | #define AUDIO_ID 0x000001c0 | |
| 35 | ||
| 36 | static int mpegvideo_probe(AVProbeData *p) | |
| 37 | { | |
| 38 | uint32_t code= -1; | |
| 39 | int pic=0, seq=0, slice=0, pspack=0, vpes=0, apes=0, res=0, sicle=0; | |
| 40 | int i, j; | |
| 41 | uint32_t last = 0; | |
| 42 | ||
| 43 | for(i=0; i<p->buf_size; i++){ | |
| 44 | code = (code<<8) + p->buf[i]; | |
| 45 | if ((code & 0xffffff00) == 0x100) { | |
| 46 | switch(code){ | |
| 47 | case SEQ_START_CODE: | |
| 48 | if (!(p->buf[i+1+3+1+2] & 0x20)) | |
| 49 | break; | |
| 50 | j = i; | |
| 51 | if (p->buf[j+8] & 2) | |
| 52 | j+= 64; | |
| 53 | if (j >= p->buf_size) | |
| 54 | break; | |
| 55 | if (p->buf[j+8] & 1) | |
| 56 | j+= 64; | |
| 57 | if (j >= p->buf_size) | |
| 58 | break; | |
| 59 | if (AV_RB24(p->buf + j + 9) & 0xFFFFFE) | |
| 60 | break; | |
| 61 | seq++; | |
| 62 | break; | |
| 63 | case PICTURE_START_CODE: pic++; break; | |
| 64 | case PACK_START_CODE: pspack++; break; | |
| 65 | case 0x1b6: | |
| 66 | res++; break; | |
| 67 | } | |
| 68 | if (code >= SLICE_START_CODE && code <= 0x1af) { | |
| 69 | if (last >= SLICE_START_CODE && last <= 0x1af) { | |
| 70 | if (code >= last) slice++; | |
| 71 | else sicle++; | |
| 72 | }else{ | |
| 73 | if (code == SLICE_START_CODE) slice++; | |
| 74 | else sicle++; | |
| 75 | } | |
| 76 | } | |
| 77 | if ((code & 0x1f0) == VIDEO_ID) vpes++; | |
| 78 | else if((code & 0x1e0) == AUDIO_ID) apes++; | |
| 79 | last = code; | |
| 80 | } | |
| 81 | } | |
| 82 | if(seq && seq*9<=pic*10 && pic*9<=slice*10 && !pspack && !apes && !res && slice > sicle) { | |
| 83 | if(vpes) return AVPROBE_SCORE_EXTENSION / 4; | |
| 84 | else return pic>1 ? AVPROBE_SCORE_EXTENSION + 1 : AVPROBE_SCORE_EXTENSION / 2; // +1 for .mpg | |
| 85 | } | |
| 86 | return 0; | |
| 87 | } | |
| 88 | ||
| 89 | FF_DEF_RAWVIDEO_DEMUXER(mpegvideo, "raw MPEG video", mpegvideo_probe, NULL, AV_CODEC_ID_MPEG1VIDEO) |