| Line | Branch | Exec | Source |
|---|---|---|---|
| 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 | 8139 | static int h263_probe(const AVProbeData *p) | |
| 26 | { | ||
| 27 | 8139 | uint64_t code= -1; | |
| 28 | int i; | ||
| 29 | 8139 | int valid_psc=0; | |
| 30 | 8139 | int invalid_psc=0; | |
| 31 | 8139 | int res_change=0; | |
| 32 | 8139 | int src_fmt, last_src_fmt=-1; | |
| 33 | 8139 | int last_gn=0; | |
| 34 | 8139 | int tr, last_tr = -1; | |
| 35 | |||
| 36 |
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511288923 | for(i=0; i<p->buf_size; i++){ |
| 37 | 511280784 | code = (code<<8) + p->buf[i]; | |
| 38 |
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511280784 | if ((code & 0xfffffc000000) == 0x80000000) { |
| 39 | 11606 | tr = (code >> 18) & 0xFF; | |
| 40 | 11606 | src_fmt= (code>>10)&7; | |
| 41 |
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11606 | if( src_fmt != last_src_fmt |
| 42 |
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4004 | && last_src_fmt>0 && last_src_fmt<6 |
| 43 |
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347 | && src_fmt<6) |
| 44 | 283 | res_change++; | |
| 45 | |||
| 46 |
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11606 | if (tr == last_tr) { |
| 47 | 3830 | invalid_psc++; | |
| 48 | 3830 | continue; | |
| 49 | } | ||
| 50 | |||
| 51 |
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7776 | if (src_fmt != 7 && !(code&(1<<9)) && (code&(1<<5))) { |
| 52 | 751 | invalid_psc++; | |
| 53 | 751 | continue; | |
| 54 | } | ||
| 55 | |||
| 56 |
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7025 | if((code&0x30000)==0x20000 && src_fmt){ |
| 57 | 486 | valid_psc++; | |
| 58 | 486 | last_gn=0; | |
| 59 | }else | ||
| 60 | 6539 | invalid_psc++; | |
| 61 | 7025 | last_src_fmt= src_fmt; | |
| 62 | 7025 | last_tr = tr; | |
| 63 |
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511269178 | } else if((code & 0xffff80000000) == 0x80000000) { |
| 64 | 617265 | int gn= (code>>(31-5)) & 0x1F; | |
| 65 |
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617265 | if(gn<last_gn){ |
| 66 | 191173 | invalid_psc++; | |
| 67 | }else | ||
| 68 | 426092 | last_gn= gn; | |
| 69 | } | ||
| 70 | } | ||
| 71 |
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8139 | if(valid_psc > 2*invalid_psc + 2*res_change + 3){ |
| 72 | ✗ | return AVPROBE_SCORE_EXTENSION; | |
| 73 |
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8139 | }else if(valid_psc > 2*invalid_psc) |
| 74 | 181 | return AVPROBE_SCORE_EXTENSION / 2; | |
| 75 | 7958 | return 0; | |
| 76 | } | ||
| 77 | |||
| 78 | FF_DEF_RAWVIDEO_DEMUXER(h263, "raw H.263", h263_probe, NULL, AV_CODEC_ID_H263) | ||
| 79 |