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2ba45a60 DM |
1 | /* |
2 | * RAW H.264 video demuxer | |
3 | * Copyright (c) 2008 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 h264_probe(AVProbeData *p) | |
26 | { | |
27 | uint32_t code = -1; | |
28 | int sps = 0, pps = 0, idr = 0, res = 0, sli = 0; | |
29 | int i; | |
30 | ||
31 | for (i = 0; i < p->buf_size; i++) { | |
32 | code = (code << 8) + p->buf[i]; | |
33 | if ((code & 0xffffff00) == 0x100) { | |
34 | int ref_idc = (code >> 5) & 3; | |
35 | int type = code & 0x1F; | |
36 | static const int8_t ref_zero[] = { | |
37 | 2, 0, 0, 0, 0, -1, 1, -1, | |
38 | -1, 1, 1, 1, 1, -1, 2, 2, | |
39 | 2, 2, 2, 0, 2, 2, 2, 2, | |
40 | 2, 2, 2, 2, 2, 2, 2, 2 | |
41 | }; | |
42 | ||
43 | if (code & 0x80) // forbidden_bit | |
44 | return 0; | |
45 | ||
46 | if (ref_zero[type] == 1 && ref_idc) | |
47 | return 0; | |
48 | if (ref_zero[type] == -1 && !ref_idc) | |
49 | return 0; | |
50 | if (ref_zero[type] == 2) | |
51 | res++; | |
52 | ||
53 | switch (type) { | |
54 | case 1: | |
55 | sli++; | |
56 | break; | |
57 | case 5: | |
58 | idr++; | |
59 | break; | |
60 | case 7: | |
61 | if (p->buf[i + 2] & 0x03) | |
62 | return 0; | |
63 | sps++; | |
64 | break; | |
65 | case 8: | |
66 | pps++; | |
67 | break; | |
68 | } | |
69 | } | |
70 | } | |
71 | ||
72 | if (sps && pps && (idr || sli > 3) && res < (sps + pps + idr)) | |
73 | return AVPROBE_SCORE_EXTENSION + 1; // 1 more than .mpg | |
74 | ||
75 | return 0; | |
76 | } | |
77 | ||
78 | FF_DEF_RAWVIDEO_DEMUXER(h264, "raw H.264 video", h264_probe, "h26l,h264,264,avc", AV_CODEC_ID_H264) |