122 lines
2.5 KiB
Go
122 lines
2.5 KiB
Go
package formatprocessor
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import (
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"fmt"
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"time"
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"github.com/bluenviron/gortsplib/v3/pkg/formats"
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"github.com/bluenviron/gortsplib/v3/pkg/formats/rtpsimpleaudio"
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"github.com/bluenviron/mediacommon/pkg/codecs/opus"
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"github.com/pion/rtp"
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"github.com/bluenviron/mediamtx/internal/logger"
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)
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// UnitOpus is a Opus data unit.
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type UnitOpus struct {
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BaseUnit
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PTS time.Duration
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Packets [][]byte
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}
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type formatProcessorOpus struct {
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udpMaxPayloadSize int
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format *formats.Opus
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encoder *rtpsimpleaudio.Encoder
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decoder *rtpsimpleaudio.Decoder
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}
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func newOpus(
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udpMaxPayloadSize int,
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forma *formats.Opus,
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generateRTPPackets bool,
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_ logger.Writer,
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) (*formatProcessorOpus, error) {
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t := &formatProcessorOpus{
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udpMaxPayloadSize: udpMaxPayloadSize,
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format: forma,
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}
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if generateRTPPackets {
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err := t.createEncoder()
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if err != nil {
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return nil, err
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}
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}
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return t, nil
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}
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func (t *formatProcessorOpus) createEncoder() error {
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t.encoder = &rtpsimpleaudio.Encoder{
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PayloadMaxSize: t.udpMaxPayloadSize - 12,
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PayloadType: t.format.PayloadTyp,
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SampleRate: 48000,
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}
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return t.encoder.Init()
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}
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func (t *formatProcessorOpus) Process(unit Unit, hasNonRTSPReaders bool) error { //nolint:dupl
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tunit := unit.(*UnitOpus)
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if tunit.RTPPackets != nil {
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pkt := tunit.RTPPackets[0]
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// remove padding
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pkt.Header.Padding = false
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pkt.PaddingSize = 0
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if pkt.MarshalSize() > t.udpMaxPayloadSize {
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return fmt.Errorf("payload size (%d) is greater than maximum allowed (%d)",
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pkt.MarshalSize(), t.udpMaxPayloadSize)
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}
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// decode from RTP
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if hasNonRTSPReaders || t.decoder != nil {
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if t.decoder == nil {
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var err error
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t.decoder, err = t.format.CreateDecoder2()
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if err != nil {
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return err
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}
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}
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packet, pts, err := t.decoder.Decode(pkt)
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if err != nil {
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return err
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}
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tunit.Packets = [][]byte{packet}
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tunit.PTS = pts
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}
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// route packet as is
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return nil
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}
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// encode into RTP
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var rtpPackets []*rtp.Packet //nolint:prealloc
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pts := tunit.PTS
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for _, packet := range tunit.Packets {
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pkt, err := t.encoder.Encode(packet, pts)
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if err != nil {
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return err
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}
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rtpPackets = append(rtpPackets, pkt)
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pts += opus.PacketDuration(packet)
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}
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tunit.RTPPackets = rtpPackets
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return nil
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}
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func (t *formatProcessorOpus) UnitForRTPPacket(pkt *rtp.Packet, ntp time.Time) Unit {
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return &UnitOpus{
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BaseUnit: BaseUnit{
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RTPPackets: []*rtp.Packet{pkt},
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NTP: ntp,
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},
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}
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}
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