mirror of
https://github.com/librempeg/librempeg
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65 lines
2.0 KiB
C
65 lines
2.0 KiB
C
/*
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* RAW HEVC video demuxer
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* Copyright (c) 2013 Dirk Farin <dirk.farin@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/hevc.h"
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#include "avformat.h"
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#include "rawdec.h"
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static int hevc_probe(const AVProbeData *p)
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{
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uint32_t code = -1;
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int vps = 0, 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 = (code & 0x7E) >> 1;
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if (code & 0x81) // forbidden and reserved zero bits
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return 0;
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if (nal2 & 0xf8) // reserved zero
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return 0;
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switch (type) {
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case HEVC_NAL_VPS: vps++; break;
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case HEVC_NAL_SPS: sps++; break;
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case HEVC_NAL_PPS: pps++; break;
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case HEVC_NAL_BLA_N_LP:
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case HEVC_NAL_BLA_W_LP:
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case HEVC_NAL_BLA_W_RADL:
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case HEVC_NAL_CRA_NUT:
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case HEVC_NAL_IDR_N_LP:
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case HEVC_NAL_IDR_W_RADL: irap++; break;
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}
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}
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}
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if (vps && 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(hevc, "raw HEVC video", hevc_probe, "hevc,h265,265", AV_CODEC_ID_HEVC)
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