mirror of
https://github.com/aler9/gortsplib
synced 2025-10-31 02:26:57 +08:00
112 lines
2.3 KiB
Go
112 lines
2.3 KiB
Go
package format
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import (
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"fmt"
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"strconv"
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"strings"
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"github.com/pion/rtp"
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)
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func findClockRate(payloadType uint8, rtpMap string, isApplication bool) (int, error) {
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// get clock rate from payload type
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// https://en.wikipedia.org/wiki/RTP_payload_formats
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switch payloadType {
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case 0, 1, 2, 3, 4, 5, 7, 8, 9, 12, 13, 15, 18:
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return 8000, nil
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case 6:
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return 16000, nil
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case 10, 11:
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return 44100, nil
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case 14, 25, 26, 28, 31, 32, 33, 34:
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return 90000, nil
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case 16:
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return 11025, nil
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case 17:
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return 22050, nil
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}
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// get clock rate from rtpmap
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// https://tools.ietf.org/html/rfc4566
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// a=rtpmap:<payload type> <encoding name>/<clock rate> [/<encoding parameters>]
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if rtpMap != "" {
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if tmp := strings.Split(rtpMap, "/"); len(tmp) >= 2 {
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v, err := strconv.ParseUint(tmp[1], 10, 31)
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if err != nil {
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return 0, err
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}
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return int(v), nil
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}
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}
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// application format without clock rate.
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// do not throw an error, but return zero, that disables RTCP sender and receiver reports.
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if isApplication || rtpMap != "" {
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return 0, nil
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}
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return 0, fmt.Errorf("clock rate not found")
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}
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// Generic is a generic RTP format.
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type Generic struct {
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PayloadTyp uint8
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RTPMa string
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FMT map[string]string
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// clock rate of the format. Filled when calling Init().
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ClockRat int
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}
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// Init computes the clock rate of the format. It is mandatory to call it.
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func (f *Generic) Init() error {
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var err error
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f.ClockRat, err = findClockRate(f.PayloadTyp, f.RTPMa, true)
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return err
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}
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func (f *Generic) unmarshal(ctx *unmarshalContext) error {
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f.PayloadTyp = ctx.payloadType
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f.RTPMa = ctx.rtpMap
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f.FMT = ctx.fmtp
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var err error
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f.ClockRat, err = findClockRate(f.PayloadTyp, f.RTPMa, ctx.mediaType == "application")
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return err
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}
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// Codec implements Format.
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func (f *Generic) Codec() string {
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return "Generic"
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}
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// ClockRate implements Format.
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func (f *Generic) ClockRate() int {
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return f.ClockRat
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}
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// PayloadType implements Format.
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func (f *Generic) PayloadType() uint8 {
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return f.PayloadTyp
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}
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// RTPMap implements Format.
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func (f *Generic) RTPMap() string {
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return f.RTPMa
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}
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// FMTP implements Format.
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func (f *Generic) FMTP() map[string]string {
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return f.FMT
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}
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// PTSEqualsDTS implements Format.
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func (f *Generic) PTSEqualsDTS(*rtp.Packet) bool {
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return true
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}
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