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chromium / chromium / third_party / ffmpeg / 8238bc0b5e3dba271217b1223a901b3f9713dc6e / . / libavformat / hevcdec.c
blob: 255f03bc48640603a283a261cbfa55b2dd49b7cb [file] [log] [blame]
Dirk Farin902a5fa2013-09-02 12:33:14[diff] [blame]1/*
Dirk Farin2ac31772013-10-12 09:55:44[diff] [blame]2 * RAW HEVC video demuxer
Dirk Farin902a5fa2013-09-02 12:33:14[diff] [blame]3 * Copyright (c) 2013 Dirk Farin <[email protected]>
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
Anton Khirnovc359d622016-08-21 15:35:28[diff] [blame]22#include "libavcodec/hevc.h"
Dirk Farin58466462013-09-12 07:14:45[diff] [blame]23
Dirk Farin902a5fa2013-09-02 12:33:14[diff] [blame]24#include "avformat.h"
25#include "rawdec.h"
26
Carl Eugen Hoyos4d8875e2019-03-21 00:18:37[diff] [blame]27static int hevc_probe(const AVProbeData *p)
Dirk Farin902a5fa2013-09-02 12:33:14[diff] [blame]28{
Dirk Farin2ac31772013-10-12 09:55:44[diff] [blame]29 uint32_t code = -1;
30 int vps = 0, sps = 0, pps = 0, irap = 0;
Dirk Farin902a5fa2013-09-02 12:33:14[diff] [blame]31 int i;
32
Dirk Farin2ac31772013-10-12 09:55:44[diff] [blame]33 for (i = 0; i < p->buf_size - 1; i++) {
34 code = (code << 8) + p->buf[i];
Dirk Farin902a5fa2013-09-02 12:33:14[diff] [blame]35 if ((code & 0xffffff00) == 0x100) {
Dirk Farin2ac31772013-10-12 09:55:44[diff] [blame]36 uint8_t nal2 = p->buf[i + 1];
37 int type = (code & 0x7E) >> 1;
Dirk Farin902a5fa2013-09-02 12:33:14[diff] [blame]38
Dirk Farin2ac31772013-10-12 09:55:44[diff] [blame]39 if (code & 0x81) // forbidden and reserved zero bits
40 return 0;
Dirk Farin902a5fa2013-09-02 12:33:14[diff] [blame]41
Dirk Farin2ac31772013-10-12 09:55:44[diff] [blame]42 if (nal2 & 0xf8) // reserved zero
43 return 0;
Dirk Farin902a5fa2013-09-02 12:33:14[diff] [blame]44
Dirk Farin2ac31772013-10-12 09:55:44[diff] [blame]45 switch (type) {
Anton Khirnovc359d622016-08-21 15:35:28[diff] [blame]46 case HEVC_NAL_VPS: vps++; break;
47 case HEVC_NAL_SPS: sps++; break;
48 case HEVC_NAL_PPS: pps++; break;
49 case HEVC_NAL_BLA_N_LP:
50 case HEVC_NAL_BLA_W_LP:
51 case HEVC_NAL_BLA_W_RADL:
52 case HEVC_NAL_CRA_NUT:
53 case HEVC_NAL_IDR_N_LP:
54 case HEVC_NAL_IDR_W_RADL: irap++; break;
Dirk Farin2ac31772013-10-12 09:55:44[diff] [blame]55 }
Dirk Farin902a5fa2013-09-02 12:33:14[diff] [blame]56 }
57 }
58
Dirk Farin2ac31772013-10-12 09:55:44[diff] [blame]59 if (vps && sps && pps && irap)
Dirk Farin902a5fa2013-09-02 12:33:14[diff] [blame]60 return AVPROBE_SCORE_EXTENSION + 1; // 1 more than .mpg
61 return 0;
62}
63
Dirk Farin2ac31772013-10-12 09:55:44[diff] [blame]64FF_DEF_RAWVIDEO_DEMUXER(hevc, "raw HEVC video", hevc_probe, "hevc,h265,265", AV_CODEC_ID_HEVC)