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lavf/avs3dec: add raw avs3 demuxer

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Signed-off-by: hbj <hanbj@pku.edu.cn>
Signed-off-by: hwren <hwrenx@126.com>
This commit is contained in:
hwren
2020-10-05 20:10:45 +08:00
parent 6223d77578
commit ff74ad2a4b
5 changed files with 72 additions and 1 deletions
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68
libavformat/avs3dec.c Normal file
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/*
* RAW AVS3-P2/IEEE1857.10 video demuxer
* Copyright (c) 2020 Zhenyu Wang <wangzhenyu@pkusz.edu.cn>
* Bingjie Han <hanbj@pkusz.edu.cn>
* Huiwen Ren <hwrenx@gmail.com>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavcodec/avs3.h"
#include "libavcodec/internal.h"
#include "avformat.h"
#include "rawdec.h"
static int avs3video_probe(const AVProbeData *p)
{
const uint8_t *ptr = p->buf, *end = p->buf + p->buf_size;
uint32_t code = -1;
uint8_t state = 0;
int pic = 0, seq = 0, slice_pos = 0;
int ret = 0;
while (ptr < end) {
ptr = avpriv_find_start_code(ptr, end, &code);
state = code & 0xFF;
if ((code & 0xFFFFFF00) == 0x100) {
if (state < AVS3_SEQ_START_CODE) {
if (code < slice_pos)
return 0;
slice_pos = code;
} else {
slice_pos = 0;
}
if (state == AVS3_SEQ_START_CODE) {
seq++;
if (*ptr != AVS3_PROFILE_BASELINE_MAIN && *ptr != AVS3_PROFILE_BASELINE_MAIN10)
return 0;
} else if (AVS3_ISPIC(state)) {
pic++;
} else if ((state == AVS3_UNDEF_START_CODE) ||
(state > AVS3_VIDEO_EDIT_CODE)) {
return 0;
}
}
}
if (seq && pic && av_match_ext(p->filename, "avs3")) {
ret = AVPROBE_SCORE_MAX;
}
return ret;
}
FF_DEF_RAWVIDEO_DEMUXER(avs3, "raw AVS3-P2/IEEE1857.10", avs3video_probe, "avs3", AV_CODEC_ID_AVS3)