| Line | Branch | Exec | Source |
|---|---|---|---|
| 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 | #include "libavcodec/startcode.h" | ||
| 28 | |||
| 29 | #define SEQ_START_CODE 0x000001b3 | ||
| 30 | #define GOP_START_CODE 0x000001b8 | ||
| 31 | #define PICTURE_START_CODE 0x00000100 | ||
| 32 | #define SLICE_START_CODE 0x00000101 | ||
| 33 | #define PACK_START_CODE 0x000001ba | ||
| 34 | #define VIDEO_ID 0x000001e0 | ||
| 35 | #define AUDIO_ID 0x000001c0 | ||
| 36 | |||
| 37 | 7778 | static int mpegvideo_probe(const AVProbeData *p) | |
| 38 | { | ||
| 39 | 7778 | uint32_t code= -1; | |
| 40 | 7778 | int pic=0, seq=0, slice=0, pspack=0, vpes=0, apes=0, res=0, sicle=0; | |
| 41 | 7778 | const uint8_t *ptr = p->buf, *end = ptr + p->buf_size; | |
| 42 | 7778 | uint32_t last = 0; | |
| 43 | int j; | ||
| 44 | |||
| 45 |
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67755 | while (ptr < end) { |
| 46 | 59977 | ptr = avpriv_find_start_code(ptr, end, &code); | |
| 47 |
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59977 | if ((code & 0xffffff00) == 0x100) { |
| 48 |
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52255 | switch(code){ |
| 49 | 379 | case SEQ_START_CODE: | |
| 50 |
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379 | if (!(ptr[3 + 1 + 2] & 0x20)) |
| 51 | 14 | break; | |
| 52 | 365 | j = -1; | |
| 53 |
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365 | if (ptr[j + 8] & 2) |
| 54 | 35 | j+= 64; | |
| 55 |
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365 | if (j >= end - ptr) |
| 56 | ✗ | break; | |
| 57 |
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365 | if (ptr[j + 8] & 1) |
| 58 | 56 | j+= 64; | |
| 59 |
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365 | if (j >= end - ptr) |
| 60 | ✗ | break; | |
| 61 |
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365 | if (AV_RB24(ptr + j + 9) & 0xFFFFFE) |
| 62 | 74 | break; | |
| 63 | 291 | seq++; | |
| 64 | 291 | break; | |
| 65 | 18234 | case PICTURE_START_CODE: pic++; break; | |
| 66 | 85 | case PACK_START_CODE: pspack++; break; | |
| 67 | 231 | case 0x1b6: | |
| 68 | 231 | res++; break; | |
| 69 | } | ||
| 70 |
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52255 | if (code >= SLICE_START_CODE && code <= 0x1af) { |
| 71 |
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25862 | if (last >= SLICE_START_CODE && last <= 0x1af) { |
| 72 |
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21352 | if (code >= last) slice++; |
| 73 | 3703 | else sicle++; | |
| 74 | }else{ | ||
| 75 |
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4510 | if (code == SLICE_START_CODE) slice++; |
| 76 | 3646 | else sicle++; | |
| 77 | } | ||
| 78 | } | ||
| 79 |
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52255 | if ((code & 0x1f0) == VIDEO_ID) vpes++; |
| 80 |
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51236 | else if((code & 0x1e0) == AUDIO_ID) apes++; |
| 81 | 52255 | last = code; | |
| 82 | } | ||
| 83 | } | ||
| 84 |
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7778 | if(seq && seq*9<=pic*10 && pic*9<=slice*10 && !pspack && !apes && !res && slice > sicle) { |
| 85 |
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240 | if(vpes) return AVPROBE_SCORE_EXTENSION / 4; |
| 86 |
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229 | else return pic>1 ? AVPROBE_SCORE_EXTENSION + 1 : AVPROBE_SCORE_EXTENSION / 2; // +1 for .mpg |
| 87 | } | ||
| 88 | 7538 | return 0; | |
| 89 | } | ||
| 90 | |||
| 91 | FF_DEF_RAWVIDEO_DEMUXER(mpegvideo, "raw MPEG video", mpegvideo_probe, NULL, AV_CODEC_ID_MPEG1VIDEO) | ||
| 92 |