mirror of
https://github.com/FFmpeg/FFmpeg.git
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52 lines
1.9 KiB
C
52 lines
1.9 KiB
C
/*
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* Copyright (c) 2006 Smartjog S.A.S, Baptiste Coudurier <baptiste.coudurier@gmail.com>
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* Copyright (c) 2011-2012 Smartjog S.A.S, Clément Bœsch <clement.boesch@smartjog.com>
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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 "timecode_internal.h"
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static unsigned bcd2uint(uint8_t bcd)
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{
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unsigned low = bcd & 0xf;
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unsigned high = bcd >> 4;
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if (low > 9 || high > 9)
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return 0;
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return low + 10*high;
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}
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void ff_timecode_set_smpte(unsigned *drop, unsigned *hh, unsigned *mm, unsigned *ss, unsigned *ff,
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AVRational rate, uint32_t tcsmpte, int prevent_df, int skip_field)
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{
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*hh = bcd2uint(tcsmpte & 0x3f); // 6-bit hours
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*mm = bcd2uint(tcsmpte>>8 & 0x7f); // 7-bit minutes
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*ss = bcd2uint(tcsmpte>>16 & 0x7f); // 7-bit seconds
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*ff = bcd2uint(tcsmpte>>24 & 0x3f); // 6-bit frames
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*drop = tcsmpte & 1<<30 && !prevent_df; // 1-bit drop if not arbitrary bit
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if (av_cmp_q(rate, (AVRational) {30, 1}) == 1) {
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*ff <<= 1;
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if (!skip_field) {
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if (av_cmp_q(rate, (AVRational) {50, 1}) == 0)
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*ff += !!(tcsmpte & 1 << 7);
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else
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*ff += !!(tcsmpte & 1 << 23);
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}
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}
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}
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