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Move packet parsing code into its own package.

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This commit is contained in:
Juliusz Chroboczek 2021-07-29 21:30:12 +02:00
parent 8178275164
commit 89780b866b
5 changed files with 101 additions and 99 deletions
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64
rtpconn/codec.go → codecs/codecs.go
View file

@ -1,4 +1,4 @@
package rtpconn
package codecs
import (
"errors"
@ -8,11 +8,14 @@ import (
"github.com/pion/rtp/codecs"
)
// isKeyframe determines if packet is the start of a keyframe.
var errTruncated = errors.New("truncated packet")
var errUnsupportedCodec = errors.New("unsupported codec")
// Keyframe determines if packet is the start of a keyframe.
// It returns (true, true) if that is the case, (false, true) if that is
// definitely not the case, and (false, false) if the information cannot
// be determined.
func isKeyframe(codec string, packet *rtp.Packet) (bool, bool) {
func Keyframe(codec string, packet *rtp.Packet) (bool, bool) {
if strings.EqualFold(codec, "video/vp8") {
var vp8 codecs.VP8Packet
_, err := vp8.Unmarshal(packet.Payload)
@ -179,29 +182,26 @@ func isKeyframe(codec string, packet *rtp.Packet) (bool, bool) {
return false, false
}
var errTruncated = errors.New("truncated packet")
var errUnsupportedCodec = errors.New("unsupported codec")
type packetFlags struct {
seqno uint16
start bool
pid uint16 // only if it needs rewriting
tid uint8
sid uint8
tidupsync bool
sidsync bool
sidnonreference bool
discardable bool
type Flags struct {
Seqno uint16
Start bool
Pid uint16 // only if it needs rewriting
Tid uint8
Sid uint8
TidUpSync bool
SidSync bool
SidNonReference bool
Discardable bool
}
func getPacketFlags(codec string, buf []byte) (packetFlags, error) {
func PacketFlags(codec string, buf []byte) (Flags, error) {
if len(buf) < 12 {
return packetFlags{}, errTruncated
return Flags{}, errTruncated
}
var flags packetFlags
var flags Flags
flags.seqno = (uint16(buf[2]) << 8) | uint16(buf[3])
flags.Seqno = (uint16(buf[2]) << 8) | uint16(buf[3])
if strings.EqualFold(codec, "video/vp8") {
var packet rtp.Packet
@ -215,11 +215,11 @@ func getPacketFlags(codec string, buf []byte) (packetFlags, error) {
return flags, err
}
flags.start = vp8.S == 1 && vp8.PID == 0
flags.pid = vp8.PictureID
flags.tid = vp8.TID
flags.tidupsync = vp8.Y == 1
flags.discardable = vp8.N == 1
flags.Start = vp8.S == 1 && vp8.PID == 0
flags.Pid = vp8.PictureID
flags.Tid = vp8.TID
flags.TidUpSync = vp8.Y == 1
flags.Discardable = vp8.N == 1
return flags, nil
} else if strings.EqualFold(codec, "video/vp9") {
var packet rtp.Packet
@ -232,19 +232,19 @@ func getPacketFlags(codec string, buf []byte) (packetFlags, error) {
if err != nil {
return flags, err
}
flags.start = vp9.B
flags.tid = vp9.TID
flags.sid = vp9.SID
flags.tidupsync = vp9.U
flags.sidsync = vp9.P
flags.Start = vp9.B
flags.Tid = vp9.TID
flags.Sid = vp9.SID
flags.TidUpSync = vp9.U
flags.SidSync = vp9.P
// not yet in pion/rtp
flags.sidnonreference = (packet.Payload[0] & 0x01) != 0
flags.SidNonReference = (packet.Payload[0] & 0x01) != 0
return flags, nil
}
return flags, nil
}
func rewritePacket(codec string, data []byte, seqno uint16, delta uint16) error {
func RewritePacket(codec string, data []byte, seqno uint16, delta uint16) error {
if len(data) < 12 {
return errTruncated
}

46
codecs/codecs_test.go Normal file
View file

@ -0,0 +1,46 @@
package codecs
import (
"testing"
)
var vp8 = []byte{
0x80, 0, 0, 42,
0, 0, 0, 0,
0, 0, 0, 0,
0x90, 0x80, 0x80, 57,
0, 0, 0, 0,
}
func TestPacketFlags(t *testing.T) {
buf := append([]byte{}, vp8...)
flags, err := PacketFlags("video/vp8", buf)
if flags.Seqno != 42 || !flags.Start || flags.Pid != 57 ||
flags.Sid != 0 || flags.Tid != 0 ||
flags.TidUpSync || flags.Discardable || err != nil {
t.Errorf("Got %v, %v, %v, %v, %v, %v (%v)",
flags.Seqno, flags.Start, flags.Pid, flags.Sid,
flags.TidUpSync, flags.Discardable, err,
)
}
}
func TestRewrite(t *testing.T) {
for i := uint16(0); i < 0x7fff; i++ {
buf := append([]byte{}, vp8...)
err := RewritePacket("video/vp8", buf, i, i)
if err != nil {
t.Errorf("rewrite: %v", err)
continue
}
flags, err := PacketFlags("video/vp8", buf)
if err != nil || flags.Seqno != i ||
flags.Pid != (57+i)&0x7FFF {
t.Errorf("Expected %v %v, got %v %v (%v)",
i, (57+i)&0x7FFF,
flags.Seqno, flags.Pid, err)
}
}
}

46
rtpconn/codec_test.go
View file

@ -1,46 +0,0 @@
package rtpconn
import (
"testing"
)
var vp8 = []byte{
0x80, 0, 0, 42,
0, 0, 0, 0,
0, 0, 0, 0,
0x90, 0x80, 0x80, 57,
0, 0, 0, 0,
}
func TestPacketFlags(t *testing.T) {
buf := append([]byte{}, vp8...)
flags, err := getPacketFlags("video/vp8", buf)
if flags.seqno != 42 || !flags.start || flags.pid != 57 ||
flags.sid != 0 || flags.tid != 0 ||
flags.tidupsync || flags.discardable || err != nil {
t.Errorf("Got %v, %v, %v, %v, %v, %v (%v)",
flags.seqno, flags.start, flags.pid, flags.sid,
flags.tidupsync, flags.discardable, err,
)
}
}
func TestRewrite(t *testing.T) {
for i := uint16(0); i < 0x7fff; i++ {
buf := append([]byte{}, vp8...)
err := rewritePacket("video/vp8", buf, i, i)
if err != nil {
t.Errorf("rewrite: %v", err)
continue
}
flags, err := getPacketFlags("video/vp8", buf)
if err != nil || flags.seqno != i ||
flags.pid != (57 + i) & 0x7FFF {
t.Errorf("Expected %v %v, got %v %v (%v)",
i, (57 + i) & 0x7FFF,
flags.seqno, flags.pid, err)
}
}
}

41
rtpconn/rtpconn.go
View file

@ -14,6 +14,7 @@ import (
"github.com/pion/sdp/v3"
"github.com/pion/webrtc/v3"
"github.com/jech/galene/codecs"
"github.com/jech/galene/conn"
"github.com/jech/galene/estimator"
"github.com/jech/galene/group"
@ -213,59 +214,59 @@ var packetBufPool = sync.Pool{
func (down *rtpDownTrack) Write(buf []byte) (int, error) {
codec := down.remote.Codec().MimeType
flags, err := getPacketFlags(codec, buf)
flags, err := codecs.PacketFlags(codec, buf)
if err != nil {
return 0, err
}
layer := down.getLayerInfo()
if flags.tid > layer.maxTid || flags.sid > layer.maxSid {
if flags.tid > layer.maxTid {
if flags.Tid > layer.maxTid || flags.Sid > layer.maxSid {
if flags.Tid > layer.maxTid {
if layer.tid == layer.maxTid {
layer.wantedTid = flags.tid
layer.tid = flags.tid
layer.wantedTid = flags.Tid
layer.tid = flags.Tid
}
layer.maxTid = flags.tid
layer.maxTid = flags.Tid
}
if flags.sid > layer.maxSid {
if flags.Sid > layer.maxSid {
if layer.sid == layer.maxSid {
layer.wantedSid = flags.sid
layer.sid = flags.sid
layer.wantedSid = flags.Sid
layer.sid = flags.Sid
}
layer.maxSid = flags.sid
layer.maxSid = flags.Sid
}
down.setLayerInfo(layer)
down.adjustLayer()
}
if flags.start && (layer.tid != layer.wantedTid) {
if layer.wantedTid < layer.tid || flags.tidupsync {
if flags.Start && (layer.tid != layer.wantedTid) {
if layer.wantedTid < layer.tid || flags.TidUpSync {
layer.tid = layer.wantedTid
down.setLayerInfo(layer)
}
}
if flags.start && (layer.sid != layer.wantedSid) {
if flags.sidsync {
if flags.Start && (layer.sid != layer.wantedSid) {
if flags.SidSync {
layer.sid = layer.wantedTid
down.setLayerInfo(layer)
}
}
if flags.tid > layer.tid || flags.sid > layer.sid ||
(flags.sid < layer.sid && flags.sidnonreference) {
ok := down.packetmap.Drop(flags.seqno, flags.pid)
if flags.Tid > layer.tid || flags.Sid > layer.sid ||
(flags.Sid < layer.sid && flags.SidNonReference) {
ok := down.packetmap.Drop(flags.Seqno, flags.Pid)
if ok {
return 0, nil
}
}
ok, newseqno, piddelta := down.packetmap.Map(flags.seqno, flags.pid)
ok, newseqno, piddelta := down.packetmap.Map(flags.Seqno, flags.Pid)
if !ok {
return 0, nil
}
if newseqno == flags.seqno && piddelta == 0 {
if newseqno == flags.Seqno && piddelta == 0 {
return down.write(buf)
}
@ -274,7 +275,7 @@ func (down *rtpDownTrack) Write(buf []byte) (int, error) {
buf2 := ibuf2.([]byte)
n := copy(buf2, buf)
err = rewritePacket(codec, buf2[:n], newseqno, piddelta)
err = codecs.RewritePacket(codec, buf2[:n], newseqno, piddelta)
if err != nil {
return 0, err
}

3
rtpconn/rtpreader.go
View file

@ -8,6 +8,7 @@ import (
"github.com/pion/rtp"
"github.com/pion/webrtc/v3"
"github.com/jech/galene/codecs"
"github.com/jech/galene/packetcache"
"github.com/jech/galene/rtptime"
)
@ -74,7 +75,7 @@ func readLoop(track *rtpUpTrack) {
track.jitter.Accumulate(packet.Timestamp)
kf, kfKnown := isKeyframe(codec.MimeType, &packet)
kf, kfKnown := codecs.Keyframe(codec.MimeType, &packet)
if kf || !kfKnown {
kfNeeded = false
}