108 lines
2.3 KiB
Go
108 lines
2.3 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/rtpmpeg4audio"
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"github.com/pion/rtp"
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)
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// UnitMPEG4Audio is a MPEG-4 Audio data unit.
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type UnitMPEG4Audio 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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AUs [][]byte
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}
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// GetRTPPackets implements Unit.
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func (d *UnitMPEG4Audio) 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 *UnitMPEG4Audio) GetNTP() time.Time {
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return d.NTP
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}
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type formatProcessorMPEG4Audio struct {
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udpMaxPayloadSize int
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format *formats.MPEG4Audio
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encoder *rtpmpeg4audio.Encoder
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decoder *rtpmpeg4audio.Decoder
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}
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func newMPEG4Audio(
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udpMaxPayloadSize int,
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forma *formats.MPEG4Audio,
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allocateEncoder bool,
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) (*formatProcessorMPEG4Audio, error) {
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t := &formatProcessorMPEG4Audio{
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udpMaxPayloadSize: udpMaxPayloadSize,
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format: forma,
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}
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if allocateEncoder {
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t.encoder = &rtpmpeg4audio.Encoder{
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PayloadMaxSize: t.udpMaxPayloadSize - 12,
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PayloadType: forma.PayloadTyp,
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SampleRate: forma.Config.SampleRate,
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SizeLength: forma.SizeLength,
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IndexLength: forma.IndexLength,
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IndexDeltaLength: forma.IndexDeltaLength,
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}
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t.encoder.Init()
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}
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return t, nil
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}
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func (t *formatProcessorMPEG4Audio) Process(unit Unit, hasNonRTSPReaders bool) error { //nolint:dupl
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tunit := unit.(*UnitMPEG4Audio)
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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 {
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if t.decoder == nil {
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t.decoder = t.format.CreateDecoder()
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}
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aus, pts, err := t.decoder.Decode(pkt)
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if err != nil {
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if err == rtpmpeg4audio.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.AUs = aus
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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.AUs, 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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