mediamtx/internal/formatprocessor/mpeg4audio.go

118 lines
2.5 KiB
Go

package formatprocessor
import (
"fmt"
"time"
"github.com/bluenviron/gortsplib/v3/pkg/formats"
"github.com/bluenviron/gortsplib/v3/pkg/formats/rtpmpeg4audio"
"github.com/pion/rtp"
"github.com/bluenviron/mediamtx/internal/logger"
)
// UnitMPEG4Audio is a MPEG-4 Audio data unit.
type UnitMPEG4Audio struct {
RTPPackets []*rtp.Packet
NTP time.Time
PTS time.Duration
AUs [][]byte
}
// GetRTPPackets implements Unit.
func (d *UnitMPEG4Audio) GetRTPPackets() []*rtp.Packet {
return d.RTPPackets
}
// GetNTP implements Unit.
func (d *UnitMPEG4Audio) GetNTP() time.Time {
return d.NTP
}
type formatProcessorMPEG4Audio struct {
udpMaxPayloadSize int
format *formats.MPEG4Audio
encoder *rtpmpeg4audio.Encoder
decoder *rtpmpeg4audio.Decoder
}
func newMPEG4Audio(
udpMaxPayloadSize int,
forma *formats.MPEG4Audio,
generateRTPPackets bool,
log logger.Writer,
) (*formatProcessorMPEG4Audio, error) {
t := &formatProcessorMPEG4Audio{
udpMaxPayloadSize: udpMaxPayloadSize,
format: forma,
}
if generateRTPPackets {
t.encoder = &rtpmpeg4audio.Encoder{
PayloadMaxSize: t.udpMaxPayloadSize - 12,
PayloadType: forma.PayloadTyp,
SampleRate: forma.Config.SampleRate,
SizeLength: forma.SizeLength,
IndexLength: forma.IndexLength,
IndexDeltaLength: forma.IndexDeltaLength,
}
t.encoder.Init()
}
return t, nil
}
func (t *formatProcessorMPEG4Audio) Process(unit Unit, hasNonRTSPReaders bool) error { //nolint:dupl
tunit := unit.(*UnitMPEG4Audio)
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 {
t.decoder = t.format.CreateDecoder()
}
aus, pts, err := t.decoder.Decode(pkt)
if err != nil {
if err == rtpmpeg4audio.ErrMorePacketsNeeded {
return nil
}
return err
}
tunit.AUs = aus
tunit.PTS = pts
}
// route packet as is
return nil
}
// encode into RTP
pkts, err := t.encoder.Encode(tunit.AUs, tunit.PTS)
if err != nil {
return err
}
tunit.RTPPackets = pkts
return nil
}
func (t *formatProcessorMPEG4Audio) UnitForRTPPacket(pkt *rtp.Packet, ntp time.Time) Unit {
return &UnitMPEG4Audio{
RTPPackets: []*rtp.Packet{pkt},
NTP: ntp,
}
}