You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
125 lines
2.7 KiB
Go
125 lines
2.7 KiB
Go
package aac
|
|
|
|
import (
|
|
"bufio"
|
|
"fmt"
|
|
"io"
|
|
"time"
|
|
|
|
"gitlab.com/ics_cinnamon/joy4/av"
|
|
"gitlab.com/ics_cinnamon/joy4/av/avutil"
|
|
"gitlab.com/ics_cinnamon/joy4/codec/aacparser"
|
|
)
|
|
|
|
type Muxer struct {
|
|
w io.Writer
|
|
config aacparser.MPEG4AudioConfig
|
|
adtshdr []byte
|
|
}
|
|
|
|
func NewMuxer(w io.Writer) *Muxer {
|
|
return &Muxer{
|
|
adtshdr: make([]byte, aacparser.ADTSHeaderLength),
|
|
w: w,
|
|
}
|
|
}
|
|
|
|
func (self *Muxer) WriteHeader(streams []av.CodecData) (err error) {
|
|
if len(streams) > 1 || streams[0].Type() != av.AAC {
|
|
err = fmt.Errorf("aac: must be only one aac stream")
|
|
return
|
|
}
|
|
self.config = streams[0].(aacparser.CodecData).Config
|
|
if self.config.ObjectType > aacparser.AOT_AAC_LTP {
|
|
err = fmt.Errorf("aac: AOT %d is not allowed in ADTS", self.config.ObjectType)
|
|
}
|
|
return
|
|
}
|
|
|
|
func (self *Muxer) WritePacket(pkt av.Packet) (err error) {
|
|
aacparser.FillADTSHeader(self.adtshdr, self.config, 1024, len(pkt.Data))
|
|
if _, err = self.w.Write(self.adtshdr); err != nil {
|
|
return
|
|
}
|
|
if _, err = self.w.Write(pkt.Data); err != nil {
|
|
return
|
|
}
|
|
return
|
|
}
|
|
|
|
func (self *Muxer) WriteTrailer() (err error) {
|
|
return
|
|
}
|
|
|
|
type Demuxer struct {
|
|
r *bufio.Reader
|
|
config aacparser.MPEG4AudioConfig
|
|
codecdata av.CodecData
|
|
ts time.Duration
|
|
}
|
|
|
|
func NewDemuxer(r io.Reader) *Demuxer {
|
|
return &Demuxer{
|
|
r: bufio.NewReader(r),
|
|
}
|
|
}
|
|
|
|
func (self *Demuxer) Streams() (streams []av.CodecData, err error) {
|
|
if self.codecdata == nil {
|
|
var adtshdr []byte
|
|
var config aacparser.MPEG4AudioConfig
|
|
if adtshdr, err = self.r.Peek(9); err != nil {
|
|
return
|
|
}
|
|
if config, _, _, _, err = aacparser.ParseADTSHeader(adtshdr); err != nil {
|
|
return
|
|
}
|
|
if self.codecdata, err = aacparser.NewCodecDataFromMPEG4AudioConfig(config); err != nil {
|
|
return
|
|
}
|
|
}
|
|
streams = []av.CodecData{self.codecdata}
|
|
return
|
|
}
|
|
|
|
func (self *Demuxer) ReadPacket() (pkt av.Packet, err error) {
|
|
var adtshdr []byte
|
|
var config aacparser.MPEG4AudioConfig
|
|
var hdrlen, framelen, samples int
|
|
if adtshdr, err = self.r.Peek(9); err != nil {
|
|
return
|
|
}
|
|
if config, hdrlen, framelen, samples, err = aacparser.ParseADTSHeader(adtshdr); err != nil {
|
|
return
|
|
}
|
|
|
|
pkt.Data = make([]byte, framelen)
|
|
if _, err = io.ReadFull(self.r, pkt.Data); err != nil {
|
|
return
|
|
}
|
|
pkt.Data = pkt.Data[hdrlen:]
|
|
|
|
pkt.Time = self.ts
|
|
self.ts += time.Duration(samples) * time.Second / time.Duration(config.SampleRate)
|
|
return
|
|
}
|
|
|
|
func Handler(h *avutil.RegisterHandler) {
|
|
h.Ext = ".aac"
|
|
|
|
h.ReaderDemuxer = func(r io.Reader) av.Demuxer {
|
|
return NewDemuxer(r)
|
|
}
|
|
|
|
h.WriterMuxer = func(w io.Writer) av.Muxer {
|
|
return NewMuxer(w)
|
|
}
|
|
|
|
h.Probe = func(b []byte) bool {
|
|
_, _, _, _, err := aacparser.ParseADTSHeader(b)
|
|
return err == nil
|
|
}
|
|
|
|
h.CodecTypes = []av.CodecType{av.AAC}
|
|
}
|