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124 lines
2.8 KiB
Go
124 lines
2.8 KiB
Go
package sdp
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import (
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"encoding/base64"
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"encoding/hex"
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"fmt"
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"strconv"
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"strings"
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"gitlab.com/ics_cinnamon/joy4/av"
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)
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type Session struct {
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Uri string
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}
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type Media struct {
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AVType string
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Type av.CodecType
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TimeScale int
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Control string
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Rtpmap int
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Config []byte
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SpropParameterSets [][]byte
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PayloadType int
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SizeLength int
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IndexLength int
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}
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func Parse(content string) (sess Session, medias []Media) {
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var media *Media
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for _, line := range strings.Split(content, "\n") {
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line = strings.TrimSpace(line)
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typeval := strings.SplitN(line, "=", 2)
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if len(typeval) == 2 {
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fields := strings.SplitN(typeval[1], " ", 2)
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switch typeval[0] {
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case "m":
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if len(fields) > 0 {
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switch fields[0] {
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case "audio", "video":
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medias = append(medias, Media{AVType: fields[0]})
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media = &medias[len(medias)-1]
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mfields := strings.Split(fields[1], " ")
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if len(mfields) >= 3 {
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media.PayloadType, _ = strconv.Atoi(mfields[2])
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}
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}
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}
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case "u":
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sess.Uri = typeval[1]
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case "a":
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if media != nil {
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for _, field := range fields {
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keyval := strings.SplitN(field, ":", 2)
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if len(keyval) >= 2 {
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key := keyval[0]
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val := keyval[1]
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switch key {
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case "control":
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switch val {
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case "audio", "video", "track1":
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media.Control = val
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}
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if strings.Contains(val, "trackID") {
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media.Control = val
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}
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case "rtpmap":
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media.Rtpmap, _ = strconv.Atoi(val)
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}
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}
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keyval = strings.Split(field, "/")
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if len(keyval) >= 2 {
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key := keyval[0]
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switch strings.ToUpper(key) {
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case "MPEG4-GENERIC":
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media.Type = av.AAC
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case "H264":
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media.Type = av.H264
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}
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if i, err := strconv.Atoi(keyval[1]); err == nil {
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media.TimeScale = i
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}
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if false {
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fmt.Println("sdp:", keyval[1], media.TimeScale)
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}
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}
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keyval = strings.Split(field, ";")
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if len(keyval) > 1 {
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for _, field := range keyval {
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keyval := strings.SplitN(field, "=", 2)
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if len(keyval) == 2 {
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key := strings.TrimSpace(keyval[0])
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val := keyval[1]
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switch key {
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case "config":
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media.Config, _ = hex.DecodeString(val)
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case "sizelength":
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media.SizeLength, _ = strconv.Atoi(val)
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case "indexlength":
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media.IndexLength, _ = strconv.Atoi(val)
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case "sprop-parameter-sets":
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fields := strings.Split(val, ",")
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for _, field := range fields {
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val, _ := base64.StdEncoding.DecodeString(field)
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media.SpropParameterSets = append(media.SpropParameterSets, val)
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}
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}
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}
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}
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}
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}
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}
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}
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}
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}
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return
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}
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