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MABR: consider the diff between fetch time and publishTime #2839

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MABR: consider the diff between fetch time and publishTime #2839

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6 changes: 3 additions & 3 deletions src/media_tools/dash_client.c
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Original file line number Diff line number Diff line change
Expand Up @@ -925,12 +925,12 @@ static void gf_dash_group_timeline_setup_single(GF_MPD *mpd, GF_DASH_Group *grou
}
} else {
//adjust so that nb_seg = current_time/segdur = (fetch-ast)/seg_dur;
// = (fetch- ( mpd->availabilityStartTime + group->dash->utc_shift + group->dash->utc_drift_estimate) / segdur;
// = (fetch - (mpd->availabilityStartTime + group->dash->utc_shift + group->dash->utc_drift_estimate) / segdur;
//hence nb_seg*seg_dur = fetch - mpd->availabilityStartTime - group->dash->utc_shift - group->dash->utc_drift_estimate
//so group->dash->utc_drift_estimate = fetch - (mpd->availabilityStartTime + nb_seg*seg_dur)
//this must also be compensated by the last publishTime


u64 utc = mpd->availabilityStartTime + dyn_period->start + timeline_offset_ms;
u64 utc = mpd->availabilityStartTime + (fetch_time - mpd->publishTime) + dyn_period->start + timeline_offset_ms;
group->dash->utc_drift_estimate = ((s64) fetch_time - (s64) utc);
GF_LOG(GF_LOG_INFO, GF_LOG_DASH, ("[DASH] Estimated UTC diff of ROUTE broadcast "LLD" ms (UTC fetch "LLU" - server UTC "LLU" - MPD AST "LLU" - MPD PublishTime "LLU" - bootstraping on segment %s\n", group->dash->utc_drift_estimate, fetch_time, utc, group->dash->mpd->availabilityStartTime, group->dash->mpd->publishTime, val));
}
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