/src/ffmpeg/libavformat/hevcdec.c
Line | Count | Source |
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/hevc.h" |
23 | | |
24 | | #include "avformat.h" |
25 | | #include "rawdec.h" |
26 | | |
27 | | static int hevc_probe(const AVProbeData *p) |
28 | 967k | { |
29 | 967k | uint32_t code = -1; |
30 | 967k | int vps = 0, sps = 0, pps = 0, irap = 0; |
31 | 967k | int i; |
32 | | |
33 | 417M | for (i = 0; i < p->buf_size - 1; i++) { |
34 | 416M | code = (code << 8) + p->buf[i]; |
35 | 416M | if ((code & 0xffffff00) == 0x100) { |
36 | 1.19M | uint8_t nal2 = p->buf[i + 1]; |
37 | 1.19M | int type = (code & 0x7E) >> 1; |
38 | | |
39 | 1.19M | if (code & 0x81) // forbidden and reserved zero bits |
40 | 339k | return 0; |
41 | | |
42 | 852k | if (nal2 & 0xf8) // reserved zero |
43 | 185k | return 0; |
44 | | |
45 | 667k | switch (type) { |
46 | 74.1k | case HEVC_NAL_VPS: vps++; break; |
47 | 93.8k | case HEVC_NAL_SPS: sps++; break; |
48 | 105k | case HEVC_NAL_PPS: pps++; break; |
49 | 3.96k | case HEVC_NAL_BLA_N_LP: |
50 | 34.8k | case HEVC_NAL_BLA_W_LP: |
51 | 39.0k | case HEVC_NAL_BLA_W_RADL: |
52 | 50.5k | case HEVC_NAL_CRA_NUT: |
53 | 61.0k | case HEVC_NAL_IDR_N_LP: |
54 | 80.7k | case HEVC_NAL_IDR_W_RADL: irap++; break; |
55 | 667k | } |
56 | 667k | } |
57 | 416M | } |
58 | | |
59 | 443k | if (vps && sps && pps && irap) |
60 | 14.9k | return AVPROBE_SCORE_EXTENSION + 1; // 1 more than .mpg |
61 | 428k | return 0; |
62 | 443k | } |
63 | | |
64 | | FF_DEF_RAWVIDEO_DEMUXER(hevc, "raw HEVC video", hevc_probe, "hevc,h265,265", AV_CODEC_ID_HEVC) |