From b15e875c8ca4b77b7989d43f7e2a79f86b33b233 Mon Sep 17 00:00:00 2001 From: hwren Date: Thu, 20 Aug 2020 14:52:15 +0800 Subject: lavf/davs2.c: rename as avs2dec.c for better understanding Signed-off-by: hwren --- libavformat/avs2dec.c | 71 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 71 insertions(+) create mode 100644 libavformat/avs2dec.c (limited to 'libavformat/avs2dec.c') diff --git a/libavformat/avs2dec.c b/libavformat/avs2dec.c new file mode 100644 index 0000000000..f8337ea500 --- /dev/null +++ b/libavformat/avs2dec.c @@ -0,0 +1,71 @@ +/* + * AVS2 video stream probe. + * + * Copyright (C) 2018 Huiwen Ren, + * + * 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 "avformat.h" +#include "rawdec.h" +#include "libavcodec/internal.h" +#include "libavutil/intreadwrite.h" + +#define AVS2_ISSQH(x) ((x) == 0xB0) +#define AVS2_ISEND(x) ((x) == 0xB1) +#define AVS2_ISPIC(x) ((x) == 0xB3 || (x) == 0xB6) +#define AVS2_ISUNIT(x) (AVS2_ISSQH(x) || AVS2_ISEND(x) || (x) == 0xB2 || AVS2_ISPIC(x) || (x) == 0xB5 || (x) == 0xB7) +#define AVS2_ISPROFILE(x) ((x) == 0x20 || (x) == 0x22 || (x) == 0x30 || (x) == 0x32) + +static int avs2_probe(const AVProbeData *p) +{ + uint32_t code= -1, hds=0, pic=0, seq=0; + uint8_t state=0; + const uint8_t *ptr = p->buf, *end = p->buf + p->buf_size, *sqb=0; + if (AV_RB32(p->buf) != 0x1B0){ + return 0; + } + + while (ptr < end) { + ptr = avpriv_find_start_code(ptr, end, &code); + state = code & 0xFF; + if ((code & 0xffffff00) == 0x100) { + if (AVS2_ISUNIT(state)) { + if (sqb && !hds) { + hds = ptr - sqb; + } + if (AVS2_ISSQH(state)) { + if (!AVS2_ISPROFILE(*ptr)) + return 0; + sqb = ptr; + seq++; + } else if (AVS2_ISPIC(state)) { + pic++; + } else if (AVS2_ISEND(state)) { + break; + } + } + } + } + if (seq && hds >= 21 && pic){ + return AVPROBE_SCORE_EXTENSION + 2; // more than cavs + } + + return 0; +} + +FF_DEF_RAWVIDEO_DEMUXER(avs2, "raw AVS2-P2/IEEE1857.4", avs2_probe, "avs,avs2", AV_CODEC_ID_AVS2) -- cgit v1.2.3