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72 lines
2.3 KiB
C
72 lines
2.3 KiB
C
/*
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* AVS2 video stream probe.
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*
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* Copyright (C) 2018 Huiwen Ren, <hwrenx@126.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 "avformat.h"
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#include "rawdec.h"
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#include "libavcodec/internal.h"
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#include "libavutil/intreadwrite.h"
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#define ISSQH(x) ((x) == 0xB0 )
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#define ISEND(x) ((x) == 0xB1 )
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#define ISPIC(x) ((x) == 0xB3 || (x) == 0xB6)
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#define ISUNIT(x) ( ISSQH(x) || ISEND(x) || (x) == 0xB2 || ISPIC(x) || (x) == 0xB5 || (x) == 0xB7 )
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#define ISAVS2(x) ((x) == 0x20 || (x) == 0x22 || (x) == 0x30 || (x) == 0x32 )
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static int avs2_probe(const AVProbeData *p)
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{
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uint32_t code= -1, hds=0, pic=0, seq=0;
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uint8_t state=0;
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const uint8_t *ptr = p->buf, *end = p->buf + p->buf_size, *sqb=0;
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if (AV_RB32(p->buf) != 0x1B0){
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return 0;
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}
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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 (ISUNIT(state)) {
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if (sqb && !hds) {
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hds = ptr - sqb;
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}
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if (ISSQH(state)) {
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if (!ISAVS2(*ptr))
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return 0;
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sqb = ptr;
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seq++;
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} else if (ISPIC(state)) {
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pic++;
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} else if (ISEND(state)) {
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break;
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}
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}
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}
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}
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if (seq && hds >= 21 && pic){
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return AVPROBE_SCORE_EXTENSION + 2; // more than cavs
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}
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return 0;
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}
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FF_DEF_RAWVIDEO_DEMUXER(avs2, "raw AVS2-P2/IEEE1857.4", avs2_probe, "avs,avs2", AV_CODEC_ID_AVS2)
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