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2ba45a60 DM |
1 | /* |
2 | * RAW HEVC video demuxer | |
3 | * Copyright (c) 2013 Dirk Farin <dirk.farin@gmail.com> | |
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 "libavcodec/hevc.h" | |
23 | ||
24 | #include "avformat.h" | |
25 | #include "rawdec.h" | |
26 | ||
27 | static int hevc_probe(AVProbeData *p) | |
28 | { | |
29 | uint32_t code = -1; | |
30 | int vps = 0, sps = 0, pps = 0, irap = 0; | |
31 | int i; | |
32 | ||
33 | for (i = 0; i < p->buf_size - 1; i++) { | |
34 | code = (code << 8) + p->buf[i]; | |
35 | if ((code & 0xffffff00) == 0x100) { | |
36 | uint8_t nal2 = p->buf[i + 1]; | |
37 | int type = (code & 0x7E) >> 1; | |
38 | ||
39 | if (code & 0x81) // forbidden and reserved zero bits | |
40 | return 0; | |
41 | ||
42 | if (nal2 & 0xf8) // reserved zero | |
43 | return 0; | |
44 | ||
45 | switch (type) { | |
46 | case NAL_VPS: vps++; break; | |
47 | case NAL_SPS: sps++; break; | |
48 | case NAL_PPS: pps++; break; | |
49 | case NAL_BLA_N_LP: | |
50 | case NAL_BLA_W_LP: | |
51 | case NAL_BLA_W_RADL: | |
52 | case NAL_CRA_NUT: | |
53 | case NAL_IDR_N_LP: | |
54 | case NAL_IDR_W_RADL: irap++; break; | |
55 | } | |
56 | } | |
57 | } | |
58 | ||
59 | if (vps && sps && pps && irap) | |
60 | return AVPROBE_SCORE_EXTENSION + 1; // 1 more than .mpg | |
61 | return 0; | |
62 | } | |
63 | ||
64 | FF_DEF_RAWVIDEO_DEMUXER(hevc, "raw HEVC video", hevc_probe, "hevc,h265,265", AV_CODEC_ID_HEVC) |