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ffmpeg / libavformat / nut.c @ 663a5d9d

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1 874abace Michael Niedermayer
/*
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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"
23 e5639780 Carl Eugen Hoyos
#include "tree.h"
24 874abace Michael Niedermayer
25 5c2198b1 Michael Niedermayer
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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29 874abace Michael Niedermayer
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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}
39 f13ea4e0 Michael Niedermayer
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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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46 4a3b5fe1 Michael Niedermayer
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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}