mirror of https://git.videolan.org/git/ffmpeg.git
69 lines
2.3 KiB
C
69 lines
2.3 KiB
C
/*
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* RAW AVS3-P2/IEEE1857.10 video demuxer
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* Copyright (c) 2020 Zhenyu Wang <wangzhenyu@pkusz.edu.cn>
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* Bingjie Han <hanbj@pkusz.edu.cn>
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* Huiwen Ren <hwrenx@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/avs3.h"
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#include "libavcodec/startcode.h"
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#include "avformat.h"
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#include "rawdec.h"
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static int avs3video_probe(const AVProbeData *p)
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{
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const uint8_t *ptr = p->buf, *end = p->buf + p->buf_size;
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uint32_t code = -1;
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uint8_t state = 0;
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int pic = 0, seq = 0, slice_pos = 0;
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int ret = 0;
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while (ptr < end) {
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ptr = avpriv_find_start_code(ptr, end, &code);
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state = code & 0xFF;
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if ((code & 0xFFFFFF00) == 0x100) {
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if (state < AVS3_SEQ_START_CODE) {
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if (code < slice_pos)
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return 0;
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slice_pos = code;
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} else {
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slice_pos = 0;
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}
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if (state == AVS3_SEQ_START_CODE) {
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seq++;
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if (*ptr != AVS3_PROFILE_BASELINE_MAIN && *ptr != AVS3_PROFILE_BASELINE_MAIN10)
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return 0;
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} else if (AVS3_ISPIC(state)) {
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pic++;
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} else if ((state == AVS3_UNDEF_START_CODE) ||
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(state > AVS3_VIDEO_EDIT_CODE)) {
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return 0;
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}
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}
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}
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if (seq && pic && av_match_ext(p->filename, "avs3")) {
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ret = AVPROBE_SCORE_MAX;
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}
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return ret;
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}
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FF_DEF_RAWVIDEO_DEMUXER(avs3, "raw AVS3-P2/IEEE1857.10", avs3video_probe, "avs3", AV_CODEC_ID_AVS3)
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