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41 lines
1.1 KiB
41 lines
1.1 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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// Codec describes one of the codec lines in an SDP. This data will be
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// magically filled in if the rtpmap wasn't provided (assuming it's a well
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// known codec having a payload type less than 96.)
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type Codec struct {
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PT uint8 // 7-bit payload type we need to put in our RTP packets
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Name string // e.g. PCMU, G729, telephone-event, etc.
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Rate int // frequency in hertz. usually 8000
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Param string // sometimes used to specify number of channels
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Fmtp string // some extra info; i.e. dtmf might set as "0-16"
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}
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func (codec *Codec) Append(b *bytes.Buffer) error {
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if codec.Name == "" {
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return errors.New("Codec.Name is blank")
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}
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if codec.Rate < 8000 {
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return errors.New("Codec.Rate < 8000")
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}
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b.WriteString("a=rtpmap:")
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b.WriteString(strconv.Itoa(int(codec.PT)) + " ")
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b.WriteString(codec.Name + "/")
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b.WriteString(strconv.Itoa(codec.Rate))
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if codec.Param != "" {
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b.WriteString("/" + codec.Param)
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}
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b.WriteString("\r\n")
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if codec.Fmtp != "" {
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b.WriteString("a=fmtp:")
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b.WriteString(strconv.Itoa(int(codec.PT)) + " ")
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b.WriteString(codec.Fmtp + "\r\n")
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}
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return nil
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}
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