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https://github.com/bluenviron/mediamtx.git
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0cdae40fe3
When the absolute timestamp of incoming frames was not available, it was filled with the current timestamp, which is influenced by latency over time. This mechanism is replaced by an algorithm that detects when latency is the lowest, stores the current timestamp and uses it as reference throughout the rest of the stream.
89 lines
1.9 KiB
Go
89 lines
1.9 KiB
Go
// Package rtsp provides RTSP utilities.
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package rtsp
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import (
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"time"
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"github.com/bluenviron/gortsplib/v5"
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"github.com/bluenviron/gortsplib/v5/pkg/description"
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"github.com/bluenviron/gortsplib/v5/pkg/format"
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"github.com/bluenviron/mediamtx/internal/conf"
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"github.com/bluenviron/mediamtx/internal/logger"
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"github.com/bluenviron/mediamtx/internal/stream"
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"github.com/pion/rtp"
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)
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type ntpState int
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const (
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ntpStateInitial ntpState = iota
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ntpStateReplace
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ntpStateAvailable
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)
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type rtspSource interface {
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PacketPTS(*description.Media, *rtp.Packet) (int64, bool)
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PacketNTP(*description.Media, *rtp.Packet) (time.Time, bool)
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OnPacketRTP(*description.Media, format.Format, gortsplib.OnPacketRTPFunc)
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}
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// ToStream maps a RTSP stream to a MediaMTX stream.
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func ToStream(
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source rtspSource,
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medias []*description.Media,
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pathConf *conf.Path,
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strm *stream.Stream,
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log logger.Writer,
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) {
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for _, medi := range medias {
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for _, forma := range medi.Formats {
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cmedi := medi
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cforma := forma
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var ntpStat ntpState
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if !pathConf.UseAbsoluteTimestamp {
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ntpStat = ntpStateReplace
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}
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handleNTP := func(pkt *rtp.Packet) (time.Time, bool) {
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switch ntpStat {
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case ntpStateReplace:
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return time.Time{}, true
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case ntpStateInitial:
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ntp, avail := source.PacketNTP(cmedi, pkt)
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if !avail {
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log.Log(logger.Warn, "received RTP packet without absolute time, skipping it")
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return time.Time{}, false
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}
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ntpStat = ntpStateAvailable
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return ntp, true
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default: // ntpStateAvailable
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ntp, avail := source.PacketNTP(cmedi, pkt)
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if !avail {
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panic("should not happen")
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}
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return ntp, true
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}
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}
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source.OnPacketRTP(cmedi, cforma, func(pkt *rtp.Packet) {
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pts, ok := source.PacketPTS(cmedi, pkt)
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if !ok {
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return
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}
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ntp, ok := handleNTP(pkt)
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if !ok {
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return
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}
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strm.WriteRTPPacket(cmedi, cforma, pkt, ntp, pts)
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})
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}
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}
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}
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