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105 lines
2.2 KiB
105 lines
2.2 KiB
4 years ago
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/*
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* ioaux.c
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*
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* Copyright (C) Thomas Oestreich - June 2001
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*
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* This file is part of transcode, a video stream processing tool
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*
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* transcode is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* transcode 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU Make; see the file COPYING. If not, write to
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* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include "ioaux.h"
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#include "libtc/libtc.h"
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#include "libtc/xio.h"
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unsigned int stream_read_int16(const unsigned char *s)
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{
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unsigned int a, b, result;
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a = s[0];
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b = s[1];
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result = (a << 8) | b;
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return result;
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}
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unsigned int stream_read_int32(const unsigned char *s)
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{
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unsigned int a, b, c, d, result;
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a = s[0];
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b = s[1];
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c = s[2];
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d = s[3];
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result = (a << 24) | (b << 16) | (c << 8) | d;
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return result;
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}
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double read_time_stamp(const unsigned char *s)
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{
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unsigned long i, j;
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unsigned long clock_ref=0, clock_ref_ext=0;
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if(s[0] & 0x40) {
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i = stream_read_int32(s);
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j = stream_read_int16(s+4);
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if(i & 0x40000000 || (i >> 28) == 2)
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{
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clock_ref = ((i & 0x31000000) << 3);
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clock_ref |= ((i & 0x03fff800) << 4);
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clock_ref |= ((i & 0x000003ff) << 5);
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clock_ref |= ((j & 0xf800) >> 11);
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clock_ref_ext = (j >> 1) & 0x1ff;
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}
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}
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return (double)(clock_ref + clock_ref_ext / 300) / 90000;
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}
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long read_time_stamp_long(const unsigned char *s)
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{
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unsigned long i, j;
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unsigned long clock_ref=0, clock_ref_ext=0;
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if(s[0] & 0x40) {
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i = stream_read_int32(s);
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j = stream_read_int16(s+4);
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if(i & 0x40000000 || (i >> 28) == 2)
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{
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clock_ref = ((i & 0x31000000) << 3);
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clock_ref |= ((i & 0x03fff800) << 4);
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clock_ref |= ((i & 0x000003ff) << 5);
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clock_ref |= ((j & 0xf800) >> 11);
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clock_ref_ext = (j >> 1) & 0x1ff;
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}
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}
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return (clock_ref);
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}
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