srt, udp: support reading and writing MPEG-1 audio streams (#2147)

internal/formatprocessor/mpeg2audio.go

@@ -1,114 +0,0 @@
-package formatprocessor
-
-import (
-	"fmt"
-	"time"
-
-	"github.com/bluenviron/gortsplib/v3/pkg/formats"
-	"github.com/bluenviron/gortsplib/v3/pkg/formats/rtpmpeg2audio"
-	"github.com/pion/rtp"
-
-	"github.com/bluenviron/mediamtx/internal/logger"
-)
-
-// UnitMPEG2Audio is a MPEG-1/2 Audio data unit.
-type UnitMPEG2Audio struct {
-	BaseUnit
-	PTS    time.Duration
-	Frames [][]byte
-}
-
-type formatProcessorMPEG2Audio struct {
-	udpMaxPayloadSize int
-	format            *formats.MPEG2Audio
-	encoder           *rtpmpeg2audio.Encoder
-	decoder           *rtpmpeg2audio.Decoder
-}
-
-func newMPEG2Audio(
-	udpMaxPayloadSize int,
-	forma *formats.MPEG2Audio,
-	generateRTPPackets bool,
-	_ logger.Writer,
-) (*formatProcessorMPEG2Audio, error) {
-	t := &formatProcessorMPEG2Audio{
-		udpMaxPayloadSize: udpMaxPayloadSize,
-		format:            forma,
-	}
-
-	if generateRTPPackets {
-		err := t.createEncoder()
-		if err != nil {
-			return nil, err
-		}
-	}
-
-	return t, nil
-}
-
-func (t *formatProcessorMPEG2Audio) createEncoder() error {
-	t.encoder = &rtpmpeg2audio.Encoder{
-		PayloadMaxSize: t.udpMaxPayloadSize - 12,
-	}
-	return t.encoder.Init()
-}
-
-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 || t.decoder != nil {
-			if t.decoder == nil {
-				var err error
-				t.decoder, err = t.format.CreateDecoder2()
-				if err != nil {
-					return err
-				}
-			}
-
-			frames, pts, err := t.decoder.Decode(pkt)
-			if err != nil {
-				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
-}
-
-func (t *formatProcessorMPEG2Audio) UnitForRTPPacket(pkt *rtp.Packet, ntp time.Time) Unit {
-	return &UnitMPEG2Audio{
-		BaseUnit: BaseUnit{
-			RTPPackets: []*rtp.Packet{pkt},
-			NTP:        ntp,
-		},
-	}
-}