/* * AVS2 video stream probe. * * Copyright (C) 2018 Huiwen Ren, <hwrenx@126.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 "avformat.h" #include "rawdec.h" #include "libavcodec/internal.h" #include "libavutil/intreadwrite.h" #define ISSQH(x) ((x) == 0xB0 ) #define ISEND(x) ((x) == 0xB1 ) #define ISPIC(x) ((x) == 0xB3 || (x) == 0xB6) #define ISUNIT(x) ( ISSQH(x) || ISEND(x) || (x) == 0xB2 || ISPIC(x) || (x) == 0xB5 || (x) == 0xB7 ) #define ISAVS2(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 (ISUNIT(state)) { if (sqb && !hds) { hds = ptr - sqb; } if (ISSQH(state)) { if (!ISAVS2(*ptr)) return 0; sqb = ptr; seq++; } else if (ISPIC(state)) { pic++; } else if (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)