mirror of
https://github.com/aler9/gortsplib
synced 2025-09-27 03:25:52 +08:00
61 lines
1.4 KiB
Go
61 lines
1.4 KiB
Go
package rtpmpeg4audio
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import (
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"errors"
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"github.com/pion/rtp"
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)
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// ErrMorePacketsNeeded is returned when more packets are needed.
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var ErrMorePacketsNeeded = errors.New("need more packets")
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func joinFragments(fragments [][]byte, size int) []byte {
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ret := make([]byte, size)
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n := 0
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for _, p := range fragments {
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n += copy(ret[n:], p)
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}
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return ret
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}
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// Decoder is a RTP/MPEG-4 Audio decoder.
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// Specification: https://datatracker.ietf.org/doc/html/rfc3640
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// Specification: https://datatracker.ietf.org/doc/html/rfc6416#section-7.3
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type Decoder struct {
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// use RFC6416 (LATM) instead of RFC3640 (generic).
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LATM bool
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// Generic-only
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// The number of bits in which the AU-size field is encoded in the AU-header.
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SizeLength int
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// The number of bits in which the AU-Index is encoded in the first AU-header.
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IndexLength int
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// The number of bits in which the AU-Index-delta field is encoded in any non-first AU-header.
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IndexDeltaLength int
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firstAUParsed bool
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adtsMode bool
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fragments [][]byte
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fragmentsSize int
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fragmentsExpected int
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fragmentNextSeqNum uint16
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}
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// Init initializes the decoder.
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func (d *Decoder) Init() error {
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return nil
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}
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func (d *Decoder) resetFragments() {
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d.fragments = d.fragments[:0]
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d.fragmentsSize = 0
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}
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// Decode decodes AUs from a RTP packet.
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func (d *Decoder) Decode(pkt *rtp.Packet) ([][]byte, error) {
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if !d.LATM {
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return d.decodeGeneric(pkt)
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}
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return d.decodeLATM(pkt)
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}
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