mirror of https://github.com/FFmpeg/FFmpeg.git
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/*
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* VC-1 demuxer |
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* Copyright (c) 2015 Carl Eugen Hoyos |
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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 "libavutil/intreadwrite.h" |
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#include "libavcodec/vc1_common.h" |
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static int vc1_probe(AVProbeData *p) |
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{ |
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int seq = 0, entry = 0, frame = 0, i; |
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for (i = 0; i < p->buf_size + 5; i++) { |
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uint32_t code = AV_RB32(p->buf + i); |
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if ((code & 0xffffffe0) == 0x100) { |
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int type = code & 0x11f; |
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i += 4; |
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switch (type) { |
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case VC1_CODE_SEQHDR: { |
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int profile, level, chromaformat; |
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profile = (p->buf[i] & 0xc0) >> 6; |
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if (profile != PROFILE_ADVANCED) { |
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seq = 0; |
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continue; |
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} |
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level = (p->buf[i] & 0x38) >> 3; |
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if (level >= 5) { |
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seq = 0; |
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continue; |
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} |
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chromaformat = (p->buf[i] & 0x6) >> 1; |
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if (chromaformat != 1) { |
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seq = 0; |
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continue; |
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} |
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seq++; |
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i += 6; |
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break; |
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} |
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case VC1_CODE_ENTRYPOINT: |
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if (!seq) |
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continue; |
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entry++; |
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i += 2; |
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break; |
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case VC1_CODE_FRAME: |
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case VC1_CODE_FIELD: |
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case VC1_CODE_SLICE: |
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if (seq && entry) |
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frame++; |
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break; |
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} |
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} |
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} |
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if (frame > 1) |
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return AVPROBE_SCORE_EXTENSION / 2 + 1; |
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if (frame == 1) |
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return AVPROBE_SCORE_EXTENSION / 4; |
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return 0; |
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} |
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FF_DEF_RAWVIDEO_DEMUXER2(vc1, "raw VC-1", vc1_probe, "vc1", AV_CODEC_ID_VC1, AVFMT_GENERIC_INDEX|AVFMT_NOTIMESTAMPS) |
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