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7d7ba2175c
Reduce false positives for VVC files by adding additional checks in `vvc_probe`. Specifically, `nuh_temporal_id_plus1` is tested for valid values in extra cases depending on the NAL unit type, as per ITU-T H.266 section 7.4.2.2. Resolves trac #10703. Signed-off-by: Frank Plowman <post@frankplowman.com> Signed-off-by: Zhao Zhili <zhilizhao@tencent.com>
78 lines
2.3 KiB
C
78 lines
2.3 KiB
C
/*
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* RAW H.266 / VVC video demuxer
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* Copyright (c) 2020 Nuo Mi <nuomi2021@gmail.com>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavcodec/vvc.h"
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#include "avformat.h"
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#include "rawdec.h"
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static int check_temporal_id(uint8_t nuh_temporal_id_plus1, int type)
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{
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if (nuh_temporal_id_plus1 == 0)
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return 0;
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if (nuh_temporal_id_plus1 != 1) {
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if (type >= VVC_IDR_W_RADL && type <= VVC_RSV_IRAP_11
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|| type == VVC_DCI_NUT || type == VVC_OPI_NUT
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|| type == VVC_VPS_NUT || type == VVC_SPS_NUT
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|| type == VVC_EOS_NUT || type == VVC_EOB_NUT)
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return 0;
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}
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return 1;
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}
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static int vvc_probe(const AVProbeData *p)
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{
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uint32_t code = -1;
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int sps = 0, pps = 0, irap = 0;
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int i;
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for (i = 0; i < p->buf_size - 1; i++) {
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code = (code << 8) + p->buf[i];
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if ((code & 0xffffff00) == 0x100) {
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uint8_t nal2 = p->buf[i + 1];
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int type = (nal2 & 0xF8) >> 3;
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if (code & 0x80) // forbidden_zero_bit
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return 0;
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if (!check_temporal_id(nal2 & 0x7, type))
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return 0;
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switch (type) {
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case VVC_SPS_NUT: sps++; break;
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case VVC_PPS_NUT: pps++; break;
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case VVC_IDR_N_LP:
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case VVC_IDR_W_RADL:
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case VVC_CRA_NUT:
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case VVC_GDR_NUT: irap++; break;
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}
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}
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}
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if (sps && pps && irap)
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return AVPROBE_SCORE_EXTENSION + 1; // 1 more than .mpg
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return 0;
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}
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FF_DEF_RAWVIDEO_DEMUXER(vvc, "raw H.266/VVC video", vvc_probe, "h266,266,vvc", AV_CODEC_ID_VVC)
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