mirror of
https://github.com/livekit/livekit.git
synced 2026-06-06 13:22:06 +00:00
David Colburn
faa870de3d
* move callbacks out of messageRouter * OCD * more OCD * fix forwarder test * even more OCD * maximum OCD * package name collision, copy lock by value
67 lines
1.5 KiB
Go
67 lines
1.5 KiB
Go
package sfu
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import (
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"strings"
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"time"
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"github.com/pion/webrtc/v3"
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)
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var (
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ntpEpoch = time.Date(1900, 1, 1, 0, 0, 0, 0, time.UTC)
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)
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type ntpTime uint64
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const (
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QuarterResolution = "q"
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HalfResolution = "h"
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FullResolution = "f"
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)
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// Do a fuzzy find for a codec in the list of codecs
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// Used for lookup up a codec in an existing list to find a match
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func codecParametersFuzzySearch(needle webrtc.RTPCodecParameters, haystack []webrtc.RTPCodecParameters) (webrtc.RTPCodecParameters, error) {
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// First attempt to match on MimeType + SDPFmtpLine
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for _, c := range haystack {
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if strings.EqualFold(c.RTPCodecCapability.MimeType, needle.RTPCodecCapability.MimeType) &&
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c.RTPCodecCapability.SDPFmtpLine == needle.RTPCodecCapability.SDPFmtpLine {
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return c, nil
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}
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}
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// Fallback to just MimeType
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for _, c := range haystack {
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if strings.EqualFold(c.RTPCodecCapability.MimeType, needle.RTPCodecCapability.MimeType) {
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return c, nil
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}
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}
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return webrtc.RTPCodecParameters{}, webrtc.ErrCodecNotFound
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}
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func (t ntpTime) Duration() time.Duration {
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sec := (t >> 32) * 1e9
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frac := (t & 0xffffffff) * 1e9
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nsec := frac >> 32
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if uint32(frac) >= 0x80000000 {
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nsec++
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}
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return time.Duration(sec + nsec)
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}
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func (t ntpTime) Time() time.Time {
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return ntpEpoch.Add(t.Duration())
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}
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func toNtpTime(t time.Time) ntpTime {
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nsec := uint64(t.Sub(ntpEpoch))
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sec := nsec / 1e9
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nsec = (nsec - sec*1e9) << 32
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frac := nsec / 1e9
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if nsec%1e9 >= 1e9/2 {
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frac++
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}
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return ntpTime(sec<<32 | frac)
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}
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