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45 lines
1.2 KiB
45 lines
1.2 KiB
package sdp
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import (
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"bytes"
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"errors"
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"strconv"
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)
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// Media is a high level representation of the c=/m=/a= lines for describing a
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// specific type of media. Only "audio" and "video" are supported at this time.
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type Media struct {
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Type string // "audio" or "video"
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Proto string // RTP, SRTP, UDP, UDPTL, TCP, TLS, etc.
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Port int // port number (0 - 2^16-1)
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Codecs []Codec // never nil with at least one codec
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}
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func (media *Media) Append(b *bytes.Buffer) error {
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if media.Type != "audio" && media.Type != "video" {
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return errors.New("Media.Type not audio/video: " + media.Type)
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}
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if media.Codecs == nil || len(media.Codecs) == 0 {
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return errors.New("Media.Codecs not set")
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}
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if media.Port == 0 {
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return errors.New("Media.Port not set")
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}
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if media.Proto == "" {
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media.Proto = "RTP/AVP"
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}
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b.WriteString("m=")
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b.WriteString(media.Type + " ")
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b.WriteString(strconv.Itoa(int(media.Port)) + " ")
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b.WriteString(media.Proto)
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for _, codec := range media.Codecs {
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b.WriteString(" " + strconv.Itoa(int(codec.PT)))
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}
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b.WriteString("\r\n")
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for _, codec := range media.Codecs {
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if err := codec.Append(b); err != nil {
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return err
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}
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}
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return nil
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}
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