3 * Copyright (c) 2004-2007 Michael Niedermayer
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
25 unsigned long av_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf, unsigned int len){
26 return av_crc(av_crc04C11DB7, checksum, buf, len);
29 void ff_nut_reset_ts(NUTContext *nut, AVRational time_base, int64_t val){
31 for(i=0; i<nut->avf->nb_streams; i++){
32 nut->stream[i].last_pts= av_rescale_rnd(
33 val / nut->time_base_count,
34 time_base.num * (int64_t)nut->stream[i].time_base->den,
35 time_base.den * (int64_t)nut->stream[i].time_base->num,
40 int64_t ff_lsb2full(StreamContext *stream, int64_t lsb){
41 int64_t mask = (1<<stream->msb_pts_shift)-1;
42 int64_t delta= stream->last_pts - mask/2;
43 return ((lsb - delta)&mask) + delta;
46 int ff_nut_sp_pos_cmp(syncpoint_t *a, syncpoint_t *b){
47 return (a->pos - b->pos>>32) - (b->pos - a->pos>>32);
50 int ff_nut_sp_pts_cmp(syncpoint_t *a, syncpoint_t *b){
51 return (a->ts - b->ts>>32) - (b->ts - a->ts>>32);
54 void ff_nut_add_sp(NUTContext *nut, int64_t pos, int64_t back_ptr, int64_t ts){
55 syncpoint_t *sp2, *sp= av_mallocz(sizeof(syncpoint_t));
58 sp->back_ptr= back_ptr;
60 sp2= av_tree_insert(&nut->syncpoints, sp, ff_nut_sp_pos_cmp);