| /* |
| * 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) |
