mediamtx/internal/formatprocessor/mpeg2audio.go

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package formatprocessor
import (
"fmt"
"time"
"github.com/bluenviron/gortsplib/v3/pkg/formats"
"github.com/bluenviron/gortsplib/v3/pkg/formats/rtpmpeg2audio"
"github.com/pion/rtp"
)
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// UnitMPEG2Audio is a MPEG-2 Audio data unit.
type UnitMPEG2Audio struct {
RTPPackets []*rtp.Packet
NTP time.Time
PTS time.Duration
Frames [][]byte
}
// GetRTPPackets implements Unit.
func (d *UnitMPEG2Audio) GetRTPPackets() []*rtp.Packet {
return d.RTPPackets
}
// GetNTP implements Unit.
func (d *UnitMPEG2Audio) GetNTP() time.Time {
return d.NTP
}
type formatProcessorMPEG2Audio struct {
udpMaxPayloadSize int
format *formats.MPEG2Audio
encoder *rtpmpeg2audio.Encoder
decoder *rtpmpeg2audio.Decoder
}
func newMPEG2Audio(
udpMaxPayloadSize int,
forma *formats.MPEG2Audio,
allocateEncoder bool,
) (*formatProcessorMPEG2Audio, error) {
t := &formatProcessorMPEG2Audio{
udpMaxPayloadSize: udpMaxPayloadSize,
format: forma,
}
if allocateEncoder {
t.encoder = &rtpmpeg2audio.Encoder{
PayloadMaxSize: t.udpMaxPayloadSize - 12,
}
t.encoder.Init()
}
return t, nil
}
func (t *formatProcessorMPEG2Audio) Process(unit Unit, hasNonRTSPReaders bool) error { //nolint:dupl
tunit := unit.(*UnitMPEG2Audio)
if tunit.RTPPackets != nil {
pkt := tunit.RTPPackets[0]
// remove padding
pkt.Header.Padding = false
pkt.PaddingSize = 0
if pkt.MarshalSize() > t.udpMaxPayloadSize {
return fmt.Errorf("payload size (%d) is greater than maximum allowed (%d)",
pkt.MarshalSize(), t.udpMaxPayloadSize)
}
// decode from RTP
if hasNonRTSPReaders {
if t.decoder == nil {
t.decoder = t.format.CreateDecoder()
}
frames, pts, err := t.decoder.Decode(pkt)
if err != nil {
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if err == rtpmpeg2audio.ErrNonStartingPacketAndNoPrevious || err == rtpmpeg2audio.ErrMorePacketsNeeded {
return nil
}
return err
}
tunit.Frames = frames
tunit.PTS = pts
}
// route packet as is
return nil
}
// encode into RTP
pkts, err := t.encoder.Encode(tunit.Frames, tunit.PTS)
if err != nil {
return err
}
tunit.RTPPackets = pkts
return nil
}