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Implement SDP generation for each track

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This is still a WIP, this deserves a well thought out rewrite in the
future
This commit is contained in:
Sean DuBois
2018-07-02 23:09:20 -07:00
parent 093a4efac4
commit 6cda3cc488
3 changed files with 77 additions and 22 deletions
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54
internal/sdp/util.go
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@@ -1,15 +1,31 @@
package sdp
import (
"fmt"
"math/rand"
"strconv"
"strings"
)
// SessionBuilderTrack represents a single track in a SessionBuilder
type SessionBuilderTrack struct {
SSRC uint32
IsAudio bool
}
// SessionBuilder provides an easy way to build an SDP for an RTCPeerConnection
type SessionBuilder struct {
IceUsername, IcePassword, Fingerprint string
Candidates []string
Tracks []*SessionBuilderTrack
}
// BaseSessionDescription generates a default SDP response that is ice-lite, initiates the DTLS session and supports VP8, VP9 and Opus
func BaseSessionDescription(iceUsername, icePassword, fingerprint string, candidates []string) *SessionDescription {
func BaseSessionDescription(b *SessionBuilder) *SessionDescription {
addMediaCandidates := func(m *MediaDescription) *MediaDescription {
m.Attributes = append(m.Attributes, candidates...)
m.Attributes = append(m.Attributes, b.Candidates...)
m.Attributes = append(m.Attributes, "end-of-candidates")
return m
}
@@ -21,10 +37,10 @@ func BaseSessionDescription(iceUsername, icePassword, fingerprint string, candid
"setup:active",
"mid:audio",
"sendrecv",
"ice-ufrag:" + iceUsername,
"ice-pwd:" + icePassword,
"ice-ufrag:" + b.IceUsername,
"ice-pwd:" + b.IcePassword,
"ice-lite",
"fingerprint:sha-256 " + fingerprint,
"fingerprint:sha-256 " + b.Fingerprint,
"rtcp-mux",
"rtcp-rsize",
"rtpmap:111 opus/48000/2",
@@ -39,10 +55,10 @@ func BaseSessionDescription(iceUsername, icePassword, fingerprint string, candid
"setup:active",
"mid:video",
"sendrecv",
"ice-ufrag:" + iceUsername,
"ice-pwd:" + icePassword,
"ice-ufrag:" + b.IceUsername,
"ice-pwd:" + b.IcePassword,
"ice-lite",
"fingerprint:sha-256 " + fingerprint,
"fingerprint:sha-256 " + b.Fingerprint,
"rtcp-mux",
"rtcp-rsize",
"rtpmap:96 VP8/90000",
@@ -50,6 +66,26 @@ func BaseSessionDescription(iceUsername, icePassword, fingerprint string, candid
},
}
mediaStreamsAttribute := "msid-semantic: WMS"
for i, track := range b.Tracks {
var attributes *[]string
if track.IsAudio {
attributes = &audioMediaDescription.Attributes
} else {
attributes = &videoMediaDescription.Attributes
}
appendAttr := func(attr string) {
*attributes = append(*attributes, attr)
}
appendAttr("ssrc:" + fmt.Sprint(track.SSRC) + " cname:pion" + strconv.Itoa(i))
appendAttr("ssrc:" + fmt.Sprint(track.SSRC) + " msid:pion" + strconv.Itoa(i) + " pion" + strconv.Itoa(i))
appendAttr("ssrc:" + fmt.Sprint(track.SSRC) + " mslabel:pion" + strconv.Itoa(i))
appendAttr("ssrc:" + fmt.Sprint(track.SSRC) + " label:pion" + strconv.Itoa(i))
mediaStreamsAttribute += " pion" + strconv.Itoa(i)
}
sessionID := strconv.FormatUint(uint64(rand.Uint32())<<32+uint64(rand.Uint32()), 10)
return &SessionDescription{
ProtocolVersion: 0,
@@ -58,7 +94,7 @@ func BaseSessionDescription(iceUsername, icePassword, fingerprint string, candid
Timing: []string{"0 0"},
Attributes: []string{
"group:BUNDLE audio video",
"msid-semantic: WMS",
mediaStreamsAttribute,
},
MediaDescriptions: []*MediaDescription{
addMediaCandidates(audioMediaDescription),