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| 1 | +/* |
| 2 | + * RAW AVS3-P2/IEEE1857.10 video demuxer |
| 3 | + * Copyright (c) 2020 Zhenyu Wang <wangzhenyu@pkusz.edu.cn> |
| 4 | + * Bingjie Han <hanbj@pkusz.edu.cn> |
| 5 | + * Huiwen Ren <hwrenx@gmail.com> |
| 6 | + * |
| 7 | + * This file is part of FFmpeg. |
| 8 | + * |
| 9 | + * FFmpeg is free software; you can redistribute it and/or |
| 10 | + * modify it under the terms of the GNU Lesser General Public |
| 11 | + * License as published by the Free Software Foundation; either |
| 12 | + * version 2.1 of the License, or (at your option) any later version. |
| 13 | + * |
| 14 | + * FFmpeg is distributed in the hope that it will be useful, |
| 15 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 17 | + * Lesser General Public License for more details. |
| 18 | + * |
| 19 | + * You should have received a copy of the GNU Lesser General Public |
| 20 | + * License along with FFmpeg; if not, write to the Free Software |
| 21 | + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 22 | + */ |
| 23 | + |
| 24 | +#include "libavcodec/avs3.h" |
| 25 | +#include "libavcodec/internal.h" |
| 26 | +#include "avformat.h" |
| 27 | +#include "rawdec.h" |
| 28 | + |
| 29 | +static int avs3video_probe(const AVProbeData *p) |
| 30 | +{ |
| 31 | + const uint8_t *ptr = p->buf, *end = p->buf + p->buf_size; |
| 32 | + uint32_t code = -1; |
| 33 | + uint8_t state = 0; |
| 34 | + int pic = 0, seq = 0, slice_pos = 0; |
| 35 | + int ret = 0; |
| 36 | + |
| 37 | + while (ptr < end) { |
| 38 | + ptr = avpriv_find_start_code(ptr, end, &code); |
| 39 | + state = code & 0xFF; |
| 40 | + if ((code & 0xFFFFFF00) == 0x100) { |
| 41 | + if (state < AVS3_SEQ_START_CODE) { |
| 42 | + if (code < slice_pos) |
| 43 | + return 0; |
| 44 | + slice_pos = code; |
| 45 | + } else { |
| 46 | + slice_pos = 0; |
| 47 | + } |
| 48 | + if (state == AVS3_SEQ_START_CODE) { |
| 49 | + seq++; |
| 50 | + if (*ptr != AVS3_PROFILE_BASELINE_MAIN && *ptr != AVS3_PROFILE_BASELINE_MAIN10) |
| 51 | + return 0; |
| 52 | + } else if (AVS3_ISPIC(state)) { |
| 53 | + pic++; |
| 54 | + } else if ((state == AVS3_UNDEF_START_CODE) || |
| 55 | + (state > AVS3_VIDEO_EDIT_CODE)) { |
| 56 | + return 0; |
| 57 | + } |
| 58 | + } |
| 59 | + } |
| 60 | + |
| 61 | + if (seq && pic && av_match_ext(p->filename, "avs3")) { |
| 62 | + ret = AVPROBE_SCORE_MAX; |
| 63 | + } |
| 64 | + |
| 65 | + return ret; |
| 66 | +} |
| 67 | + |
| 68 | +FF_DEF_RAWVIDEO_DEMUXER(avs3, "raw AVS3-P2/IEEE1857.10", avs3video_probe, "avs3", AV_CODEC_ID_AVS3) |