mediamtx/internal/formatprocessor/g711.go

117 lines
2.2 KiB
Go

package formatprocessor //nolint:dupl
import (
"fmt"
"time"
"github.com/bluenviron/gortsplib/v4/pkg/format"
"github.com/bluenviron/gortsplib/v4/pkg/format/rtplpcm"
"github.com/pion/rtp"
"github.com/bluenviron/mediamtx/internal/unit"
)
type formatProcessorG711 struct {
udpMaxPayloadSize int
format *format.G711
encoder *rtplpcm.Encoder
decoder *rtplpcm.Decoder
randomStart uint32
}
func newG711(
udpMaxPayloadSize int,
forma *format.G711,
generateRTPPackets bool,
) (*formatProcessorG711, error) {
t := &formatProcessorG711{
udpMaxPayloadSize: udpMaxPayloadSize,
format: forma,
}
if generateRTPPackets {
err := t.createEncoder()
if err != nil {
return nil, err
}
t.randomStart, err = randUint32()
if err != nil {
return nil, err
}
}
return t, nil
}
func (t *formatProcessorG711) createEncoder() error {
t.encoder = &rtplpcm.Encoder{
PayloadMaxSize: t.udpMaxPayloadSize - 12,
PayloadType: t.format.PayloadType(),
BitDepth: 8,
ChannelCount: t.format.ChannelCount,
}
return t.encoder.Init()
}
func (t *formatProcessorG711) ProcessUnit(uu unit.Unit) error { //nolint:dupl
u := uu.(*unit.G711)
pkts, err := t.encoder.Encode(u.Samples)
if err != nil {
return err
}
u.RTPPackets = pkts
for _, pkt := range u.RTPPackets {
pkt.Timestamp += t.randomStart + uint32(u.PTS)
}
return nil
}
func (t *formatProcessorG711) ProcessRTPPacket( //nolint:dupl
pkt *rtp.Packet,
ntp time.Time,
pts int64,
hasNonRTSPReaders bool,
) (unit.Unit, error) {
u := &unit.G711{
Base: unit.Base{
RTPPackets: []*rtp.Packet{pkt},
NTP: ntp,
PTS: pts,
},
}
// remove padding
pkt.Header.Padding = false
pkt.PaddingSize = 0
if pkt.MarshalSize() > t.udpMaxPayloadSize {
return nil, 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.CreateDecoder()
if err != nil {
return nil, err
}
}
samples, err := t.decoder.Decode(pkt)
if err != nil {
return nil, err
}
u.Samples = samples
}
// route packet as is
return u, nil
}