123 lines
2.4 KiB
Go
123 lines
2.4 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/v4/pkg/format"
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"github.com/bluenviron/gortsplib/v4/pkg/format/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/unit"
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)
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type formatProcessorOpus struct {
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udpMaxPayloadSize int
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format *format.Opus
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encoder *rtpsimpleaudio.Encoder
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decoder *rtpsimpleaudio.Decoder
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randomStart uint32
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}
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func newOpus(
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udpMaxPayloadSize int,
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forma *format.Opus,
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generateRTPPackets bool,
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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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t.randomStart, err = randUint32()
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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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}
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return t.encoder.Init()
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}
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func (t *formatProcessorOpus) ProcessUnit(uu unit.Unit) error { //nolint:dupl
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u := uu.(*unit.Opus)
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var rtpPackets []*rtp.Packet //nolint:prealloc
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pts := u.PTS
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for _, packet := range u.Packets {
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pkt, err := t.encoder.Encode(packet)
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if err != nil {
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return err
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}
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pkt.Timestamp += t.randomStart + uint32(pts)
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rtpPackets = append(rtpPackets, pkt)
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pts += int64(opus.PacketDuration(packet)) * int64(t.format.ClockRate()) / int64(time.Second)
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}
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u.RTPPackets = rtpPackets
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return nil
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}
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func (t *formatProcessorOpus) ProcessRTPPacket(
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pkt *rtp.Packet,
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ntp time.Time,
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pts int64,
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hasNonRTSPReaders bool,
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) (unit.Unit, error) {
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u := &unit.Opus{
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Base: unit.Base{
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RTPPackets: []*rtp.Packet{pkt},
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NTP: ntp,
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PTS: pts,
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},
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}
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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 nil, 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.CreateDecoder()
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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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packet, err := t.decoder.Decode(pkt)
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if err != nil {
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return nil, err
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}
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u.Packets = [][]byte{packet}
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}
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// route packet as is
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return u, nil
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}
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