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time jitter detect and correct, very simple algorithm

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winlin 2013-10-23 21:37:22 +08:00
parent e31e3d601d
commit b40d0467a8
1 changed files with 8 additions and 5 deletions
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13
trunk/src/core/srs_core_source.cpp
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@ -68,11 +68,14 @@ int SrsConsumer::enqueue(SrsSharedPtrMessage* msg)
int ret = ERROR_SUCCESS;
/**
* we use a very simple time jitter detect/correct algorithm,
* if the delta of time is nagative or greater than CONST_MAX_JITTER_MS,
* we enforce the delta to DEFAULT_FRAME_TIME_MS,
* and update the last_pkt_time which used to detect next jitter.
* the last_pkt_correct_time is enforce the time monotonically.
* we use a very simple time jitter detect/correct algorithm:
* 1. delta: ensure the delta is positive and valid,
* we set the delta to DEFAULT_FRAME_TIME_MS,
* if the delta of time is nagative or greater than CONST_MAX_JITTER_MS.
* 2. last_pkt_time: specifies the original packet time,
* is used to detect next jitter.
* 3. last_pkt_correct_time: simply add the positive delta,
* and enforce the time monotonically.
*/
int32_t time = msg->header.timestamp;
int32_t delta = time - last_pkt_time;