124 lines
2.6 KiB
Go
124 lines
2.6 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/v3/pkg/formats"
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"github.com/bluenviron/gortsplib/v3/pkg/formats/rtpmpeg2audio"
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"github.com/pion/rtp"
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"github.com/bluenviron/mediamtx/internal/logger"
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)
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// UnitMPEG2Audio is a MPEG-1/2 Audio data unit.
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type UnitMPEG2Audio struct {
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RTPPackets []*rtp.Packet
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NTP time.Time
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PTS time.Duration
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Frames [][]byte
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}
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// GetRTPPackets implements Unit.
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func (d *UnitMPEG2Audio) GetRTPPackets() []*rtp.Packet {
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return d.RTPPackets
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}
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// GetNTP implements Unit.
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func (d *UnitMPEG2Audio) GetNTP() time.Time {
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return d.NTP
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}
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type formatProcessorMPEG2Audio struct {
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udpMaxPayloadSize int
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format *formats.MPEG2Audio
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encoder *rtpmpeg2audio.Encoder
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decoder *rtpmpeg2audio.Decoder
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}
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func newMPEG2Audio(
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udpMaxPayloadSize int,
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forma *formats.MPEG2Audio,
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generateRTPPackets bool,
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_ logger.Writer,
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) (*formatProcessorMPEG2Audio, error) {
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t := &formatProcessorMPEG2Audio{
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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 *formatProcessorMPEG2Audio) createEncoder() error {
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t.encoder = &rtpmpeg2audio.Encoder{
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PayloadMaxSize: t.udpMaxPayloadSize - 12,
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}
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return t.encoder.Init()
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}
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func (t *formatProcessorMPEG2Audio) Process(unit Unit, hasNonRTSPReaders bool) error { //nolint:dupl
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tunit := unit.(*UnitMPEG2Audio)
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if tunit.RTPPackets != nil {
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pkt := tunit.RTPPackets[0]
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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 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.CreateDecoder2()
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if err != nil {
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return err
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}
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}
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frames, pts, err := t.decoder.Decode(pkt)
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if err != nil {
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if err == rtpmpeg2audio.ErrNonStartingPacketAndNoPrevious || err == rtpmpeg2audio.ErrMorePacketsNeeded {
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return nil
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}
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return err
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}
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tunit.Frames = frames
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tunit.PTS = pts
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}
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// route packet as is
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return nil
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}
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// encode into RTP
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pkts, err := t.encoder.Encode(tunit.Frames, tunit.PTS)
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if err != nil {
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return err
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}
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tunit.RTPPackets = pkts
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return nil
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}
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func (t *formatProcessorMPEG2Audio) UnitForRTPPacket(pkt *rtp.Packet, ntp time.Time) Unit {
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return &UnitMPEG2Audio{
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RTPPackets: []*rtp.Packet{pkt},
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NTP: ntp,
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}
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}
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