mirror of
https://github.com/FFmpeg/FFmpeg.git
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63 lines
2.1 KiB
C
63 lines
2.1 KiB
C
/*
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* nut
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* Copyright (c) 2004-2007 Michael Niedermayer
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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 "nut.h"
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unsigned long av_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf, unsigned int len){
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return av_crc(av_crc04C11DB7, checksum, buf, len);
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}
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void ff_nut_reset_ts(NUTContext *nut, AVRational time_base, int64_t val){
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int i;
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for(i=0; i<nut->avf->nb_streams; i++){
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nut->stream[i].last_pts= av_rescale_rnd(
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val / nut->time_base_count,
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time_base.num * (int64_t)nut->stream[i].time_base->den,
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time_base.den * (int64_t)nut->stream[i].time_base->num,
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AV_ROUND_DOWN);
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}
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}
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int64_t ff_lsb2full(StreamContext *stream, int64_t lsb){
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int64_t mask = (1<<stream->msb_pts_shift)-1;
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int64_t delta= stream->last_pts - mask/2;
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return ((lsb - delta)&mask) + delta;
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}
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int ff_nut_sp_pos_cmp(syncpoint_t *a, syncpoint_t *b){
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return (a->pos - b->pos>>32) - (b->pos - a->pos>>32);
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}
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int ff_nut_sp_pts_cmp(syncpoint_t *a, syncpoint_t *b){
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return (a->ts - b->ts>>32) - (b->ts - a->ts>>32);
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}
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void ff_nut_add_sp(NUTContext *nut, int64_t pos, int64_t back_ptr, int64_t ts){
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syncpoint_t *sp2, *sp= av_mallocz(sizeof(syncpoint_t));
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sp->pos= pos;
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sp->back_ptr= back_ptr;
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sp->ts= ts;
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sp2= av_tree_insert(&nut->syncpoints, sp, ff_nut_sp_pos_cmp);
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if(sp2 && sp2 != sp)
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av_free(sp);
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}
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