mirror of
https://github.com/aler9/gortsplib
synced 2025-10-31 02:26:57 +08:00
114 lines
2.3 KiB
Go
114 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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"github.com/bluenviron/gortsplib/v4/pkg/format/rtpsimpleaudio"
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)
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// Opus is a RTP format for the Opus codec.
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// Specification: https://datatracker.ietf.org/doc/html/rfc7587
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type Opus struct {
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PayloadTyp uint8
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IsStereo bool
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}
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func (f *Opus) unmarshal(ctx *unmarshalContext) error {
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f.PayloadTyp = ctx.payloadType
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tmp := strings.SplitN(ctx.clock, "/", 2)
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if len(tmp) != 2 {
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return fmt.Errorf("invalid clock (%v)", ctx.clock)
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}
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sampleRate, err := strconv.ParseUint(tmp[0], 10, 31)
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if err != nil || sampleRate != 48000 {
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return fmt.Errorf("invalid sample rate: %d", sampleRate)
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}
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channelCount, err := strconv.ParseUint(tmp[1], 10, 31)
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if err != nil || channelCount != 2 {
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return fmt.Errorf("invalid channel count: %d", channelCount)
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}
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for key, val := range ctx.fmtp {
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if key == "sprop-stereo" {
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f.IsStereo = (val == "1")
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}
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}
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return nil
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}
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// Codec implements Format.
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func (f *Opus) Codec() string {
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return "Opus"
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}
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// ClockRate implements Format.
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func (f *Opus) ClockRate() int {
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// RFC7587: the RTP timestamp is incremented with a 48000 Hz
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// clock rate for all modes of Opus and all sampling rates.
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return 48000
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}
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// PayloadType implements Format.
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func (f *Opus) 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 *Opus) RTPMap() string {
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// RFC7587: The RTP clock rate in "a=rtpmap" MUST be 48000, and the
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// number of channels MUST be 2.
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return "opus/48000/2"
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}
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// FMTP implements Format.
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func (f *Opus) FMTP() map[string]string {
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fmtp := map[string]string{
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"sprop-stereo": func() string {
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if f.IsStereo {
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return "1"
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}
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return "0"
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}(),
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}
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return fmtp
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}
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// PTSEqualsDTS implements Format.
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func (f *Opus) PTSEqualsDTS(*rtp.Packet) bool {
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return true
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}
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// CreateDecoder creates a decoder able to decode the content of the format.
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func (f *Opus) CreateDecoder() (*rtpsimpleaudio.Decoder, error) {
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d := &rtpsimpleaudio.Decoder{}
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err := d.Init()
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if err != nil {
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return nil, err
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}
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return d, nil
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}
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// CreateEncoder creates an encoder able to encode the content of the format.
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func (f *Opus) CreateEncoder() (*rtpsimpleaudio.Encoder, error) {
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e := &rtpsimpleaudio.Encoder{
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PayloadType: f.PayloadTyp,
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}
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err := e.Init()
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if err != nil {
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return nil, err
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}
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return e, nil
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}
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