113 lines
2.2 KiB
Go
113 lines
2.2 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/rtpac3"
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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 formatProcessorAC3 struct {
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udpMaxPayloadSize int
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format *format.AC3
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encoder *rtpac3.Encoder
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decoder *rtpac3.Decoder
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}
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func newAC3(
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udpMaxPayloadSize int,
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forma *format.AC3,
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generateRTPPackets bool,
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) (*formatProcessorAC3, error) {
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t := &formatProcessorAC3{
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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 *formatProcessorAC3) createEncoder() error {
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t.encoder = &rtpac3.Encoder{
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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 *formatProcessorAC3) ProcessUnit(uu unit.Unit) error { //nolint:dupl
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u := uu.(*unit.AC3)
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pkts, err := t.encoder.Encode(u.Frames)
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if err != nil {
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return err
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}
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ts := uint32(multiplyAndDivide(u.PTS, time.Duration(t.format.ClockRate()), time.Second))
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for _, pkt := range pkts {
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pkt.Timestamp += ts
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}
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u.RTPPackets = pkts
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return nil
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}
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func (t *formatProcessorAC3) ProcessRTPPacket( //nolint:dupl
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pkt *rtp.Packet,
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ntp time.Time,
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pts time.Duration,
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hasNonRTSPReaders bool,
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) (Unit, error) {
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u := &unit.AC3{
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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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frames, err := t.decoder.Decode(pkt)
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if err != nil {
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if err == rtpac3.ErrNonStartingPacketAndNoPrevious || err == rtpac3.ErrMorePacketsNeeded {
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return u, nil
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}
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return nil, err
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}
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u.Frames = frames
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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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