mirror of
https://github.com/lkmio/gb-cms.git
synced 2025-09-26 19:51:22 +08:00
53 lines
1.7 KiB
Go
53 lines
1.7 KiB
Go
// Copyright 2020 Justine Alexandra Roberts Tunney
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package sdp
|
|
|
|
import (
|
|
"bytes"
|
|
"strconv"
|
|
)
|
|
|
|
// Codec describes one of the codec lines in an SDP. This data will be
|
|
// magically filled in if the rtpmap wasn't provided (assuming it's a well
|
|
// known codec having a payload type less than 96.)
|
|
type Codec struct {
|
|
PT uint8 // 7-bit payload type we need to put in our RTP packets
|
|
Name string // e.g. PCMU, G729, telephone-event, etc.
|
|
Rate int // frequency in hertz. usually 8000
|
|
Param string // sometimes used to specify number of channels
|
|
Fmtp string // some extra info; i.e. dtmf might set as "0-16"
|
|
}
|
|
|
|
func (codec *Codec) Append(b *bytes.Buffer) {
|
|
b.WriteString("a=rtpmap:")
|
|
b.WriteString(strconv.FormatInt(int64(codec.PT), 10))
|
|
b.WriteString(" ")
|
|
b.WriteString(codec.Name)
|
|
b.WriteString("/")
|
|
b.WriteString(strconv.Itoa(codec.Rate))
|
|
if codec.Param != "" {
|
|
b.WriteString("/")
|
|
b.WriteString(codec.Param)
|
|
}
|
|
b.WriteString("\r\n")
|
|
if codec.Fmtp != "" {
|
|
b.WriteString("a=fmtp:")
|
|
b.WriteString(strconv.FormatInt(int64(codec.PT), 10))
|
|
b.WriteString(" ")
|
|
b.WriteString(codec.Fmtp)
|
|
b.WriteString("\r\n")
|
|
}
|
|
}
|