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Move isKeyframe into its own file.

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This commit is contained in:
Juliusz Chroboczek 2021-05-11 19:59:24 +02:00
parent 6278333a9a
commit b2ea8e8533
2 changed files with 112 additions and 106 deletions
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112
rtpconn/codec.go Normal file
View file

@ -0,0 +1,112 @@
package rtpconn
import (
"strings"
"github.com/pion/rtp"
"github.com/pion/rtp/codecs"
)
// isKeyframe 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) {
switch strings.ToLower(codec) {
case "video/vp8":
var vp8 codecs.VP8Packet
_, err := vp8.Unmarshal(packet.Payload)
if err != nil || len(vp8.Payload) < 1 {
return false, false
}
if vp8.S != 0 && vp8.PID == 0 && (vp8.Payload[0]&0x1) == 0 {
return true, true
}
return false, true
case "video/vp9":
var vp9 codecs.VP9Packet
_, err := vp9.Unmarshal(packet.Payload)
if err != nil || len(vp9.Payload) < 1 {
return false, false
}
if !vp9.B {
return false, true
}
if (vp9.Payload[0] & 0xc0) != 0x80 {
return false, false
}
profile := (vp9.Payload[0] >> 4) & 0x3
if profile != 3 {
return (vp9.Payload[0] & 0xC) == 0, true
}
return (vp9.Payload[0] & 0x6) == 0, true
case "video/h264":
if len(packet.Payload) < 1 {
return false, false
}
nalu := packet.Payload[0] & 0x1F
if nalu == 0 {
// reserved
return false, false
} else if nalu <= 23 {
// simple NALU
return nalu == 5, true
} else if nalu == 24 || nalu == 25 || nalu == 26 || nalu == 27 {
// STAP-A, STAP-B, MTAP16 or MTAP24
i := 1
if nalu == 25 || nalu == 26 || nalu == 27 {
// skip DON
i += 2
}
for i < len(packet.Payload) {
if i+2 > len(packet.Payload) {
return false, false
}
length := uint16(packet.Payload[i])<<8 |
uint16(packet.Payload[i+1])
i += 2
if i+int(length) > len(packet.Payload) {
return false, false
}
offset := 0
if nalu == 26 {
offset = 3
} else if nalu == 27 {
offset = 4
}
if offset >= int(length) {
return false, false
}
n := packet.Payload[i+offset] & 0x1F
if n == 5 {
return true, true
} else if n >= 24 {
// is this legal?
return false, false
}
i += int(length)
}
if i == len(packet.Payload) {
return false, true
}
return false, false
} else if nalu == 28 || nalu == 29 {
// FU-A or FU-B
if len(packet.Payload) < 2 {
return false, false
}
if (packet.Payload[1] & 0x80) == 0 {
// not a starting fragment
return false, true
}
return (packet.Payload[1]&0x1F == 5), true
}
return false, false
default:
return false, false
}
}

106
rtpconn/rtpreader.go
View file

@ -3,120 +3,14 @@ package rtpconn
import ( import (
"io" "io"
"log" "log"
"strings"
"github.com/pion/rtp" "github.com/pion/rtp"
"github.com/pion/rtp/codecs"
"github.com/pion/webrtc/v3" "github.com/pion/webrtc/v3"
"github.com/jech/galene/packetcache" "github.com/jech/galene/packetcache"
"github.com/jech/galene/rtptime" "github.com/jech/galene/rtptime"
) )
// isKeyframe 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) {
switch strings.ToLower(codec) {
case "video/vp8":
var vp8 codecs.VP8Packet
_, err := vp8.Unmarshal(packet.Payload)
if err != nil || len(vp8.Payload) < 1 {
return false, false
}
if vp8.S != 0 && vp8.PID == 0 && (vp8.Payload[0]&0x1) == 0 {
return true, true
}
return false, true
case "video/vp9":
var vp9 codecs.VP9Packet
_, err := vp9.Unmarshal(packet.Payload)
if err != nil || len(vp9.Payload) < 1 {
return false, false
}
if !vp9.B {
return false, true
}
if (vp9.Payload[0] & 0xc0) != 0x80 {
return false, false
}
profile := (vp9.Payload[0] >> 4) & 0x3
if profile != 3 {
return (vp9.Payload[0] & 0xC) == 0, true
}
return (vp9.Payload[0] & 0x6) == 0, true
case "video/h264":
if len(packet.Payload) < 1 {
return false, false
}
nalu := packet.Payload[0] & 0x1F
if nalu == 0 {
// reserved
return false, false
} else if nalu <= 23 {
// simple NALU
return nalu == 5, true
} else if nalu == 24 || nalu == 25 || nalu == 26 || nalu == 27 {
// STAP-A, STAP-B, MTAP16 or MTAP24
i := 1
if nalu == 25 || nalu == 26 || nalu == 27 {
// skip DON
i += 2
}
for i < len(packet.Payload) {
if i+2 > len(packet.Payload) {
return false, false
}
length := uint16(packet.Payload[i])<<8 |
uint16(packet.Payload[i+1])
i += 2
if i+int(length) > len(packet.Payload) {
return false, false
}
offset := 0
if nalu == 26 {
offset = 3
} else if nalu == 27 {
offset = 4
}
if offset >= int(length) {
return false, false
}
n := packet.Payload[i + offset] & 0x1F
if n == 5 {
return true, true
} else if n >= 24 {
// is this legal?
return false, false
}
i += int(length)
}
if i == len(packet.Payload) {
return false, true
}
return false, false
} else if nalu == 28 || nalu == 29 {
// FU-A or FU-B
if len(packet.Payload) < 2 {
return false, false
}
if (packet.Payload[1] & 0x80) == 0 {
// not a starting fragment
return false, true
}
return (packet.Payload[1]&0x1F == 5), true
}
return false, false
default:
return false, false
}
}
func readLoop(conn *rtpUpConnection, track *rtpUpTrack) { func readLoop(conn *rtpUpConnection, track *rtpUpTrack) {
writers := rtpWriterPool{conn: conn, track: track} writers := rtpWriterPool{conn: conn, track: track}
defer func() { defer func() {