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audio_track.go
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audio_track.go
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package engine
import (
"time"
"github.com/Monibuca/utils/v3/codec"
)
type AudioPack struct {
AVPack
Raw []byte
}
type AudioTrack struct {
AVTrack
SoundRate int //2bit
SoundSize byte //1bit
Channels byte //1bit
ExtraData []byte `json:"-"` //rtmp协议需要先发这个帧
PushByteStream func(ts uint32, payload []byte) `json:"-"`
PushRaw func(ts uint32, payload []byte) `json:"-"`
writeByteStream func() //使用函数写入,避免申请内存
*AudioPack `json:"-"` // 当前正在写入的音频对象
}
func (at *AudioTrack) pushByteStream(ts uint32, payload []byte) {
switch at.CodecID = payload[0] >> 4; at.CodecID {
case codec.CodecID_AAC:
if payload[1] != 0 {
return
} else {
config1, config2 := payload[2], payload[3]
//audioObjectType = (config1 & 0xF8) >> 3
// 1 AAC MAIN ISO/IEC 14496-3 subpart 4
// 2 AAC LC ISO/IEC 14496-3 subpart 4
// 3 AAC SSR ISO/IEC 14496-3 subpart 4
// 4 AAC LTP ISO/IEC 14496-3 subpart 4
at.SoundRate = codec.SamplingFrequencies[((config1&0x7)<<1)|(config2>>7)]
at.Channels = ((config2 >> 3) & 0x0F) //声道
//frameLengthFlag = (config2 >> 2) & 0x01
//dependsOnCoreCoder = (config2 >> 1) & 0x01
//extensionFlag = config2 & 0x01
at.ExtraData = payload
at.timebase = time.Duration(at.SoundRate)
at.PushByteStream = func(ts uint32, payload []byte) {
if len(payload) < 3 {
return
}
at.setTS(ts)
at.Raw = payload[2:]
at.Payload = payload
at.push()
}
at.Stream.AudioTracks.AddTrack("aac", at)
}
default:
at.SoundRate = codec.SoundRate[(payload[0]&0x0c)>>2] // 采样率 0 = 5.5 kHz or 1 = 11 kHz or 2 = 22 kHz or 3 = 44 kHz
at.SoundSize = (payload[0] & 0x02) >> 1 // 采样精度 0 = 8-bit samples or 1 = 16-bit samples
at.Channels = payload[0]&0x01 + 1
at.ExtraData = payload[:1]
at.timebase = time.Duration(at.SoundRate)
at.PushByteStream = func(ts uint32, payload []byte) {
if len(payload) < 2 {
return
}
at.setTS(ts)
at.Raw = payload[1:]
at.Payload = payload
at.push()
}
switch at.CodecID {
case codec.CodecID_PCMA:
at.Stream.AudioTracks.AddTrack("pcma", at)
case codec.CodecID_PCMU:
at.Stream.AudioTracks.AddTrack("pcmu", at)
}
at.PushByteStream(ts, payload)
}
}
func (at *AudioTrack) setCurrent() {
at.AVTrack.setCurrent()
at.AudioPack = at.Value.(*AudioPack)
}
func (at *AudioTrack) pushRaw(ts uint32, payload []byte) {
switch at.CodecID {
case 10:
at.writeByteStream = func() {
at.Reset()
at.Buffer.Write([]byte{at.ExtraData[0], 1})
at.Buffer.Write(at.Raw)
at.Bytes2Payload()
}
default:
at.writeByteStream = func() {
at.Reset()
at.WriteByte(at.ExtraData[0])
at.Buffer.Write(at.Raw)
at.Bytes2Payload()
}
}
at.PushRaw = func(ts uint32, payload []byte) {
at.setTS(ts)
at.Raw = payload
at.push()
}
at.PushRaw(ts, payload)
}
// Push 来自发布者推送的音频
func (at *AudioTrack) push() {
if at.Stream != nil {
at.Stream.Update()
}
if at.writeByteStream != nil {
at.writeByteStream()
}
at.addBytes(len(at.Raw))
at.GetBPS()
if at.Timestamp.Sub(at.ts) > time.Second {
at.resetBPS()
}
at.Step()
at.setCurrent()
}
func (s *Stream) NewAudioTrack(codec byte) (at *AudioTrack) {
at = &AudioTrack{}
at.timebase = 8000
at.CodecID = codec
at.PushByteStream = at.pushByteStream
at.PushRaw = at.pushRaw
at.Stream = s
at.Init(s.Context, 256)
at.poll = time.Millisecond * 10
at.Do(func(v interface{}) {
v.(*AVItem).Value = new(AudioPack)
})
at.setCurrent()
switch codec {
case 10:
s.AudioTracks.AddTrack("aac", at)
case 7:
s.AudioTracks.AddTrack("pcma", at)
case 8:
s.AudioTracks.AddTrack("pcmu", at)
}
return
}
func (at *AudioTrack) SetASC(asc []byte) {
at.ExtraData = append([]byte{0xAF, 0}, asc...)
config1 := asc[0]
config2 := asc[1]
at.CodecID = 10
//audioObjectType = (config1 & 0xF8) >> 3
// 1 AAC MAIN ISO/IEC 14496-3 subpart 4
// 2 AAC LC ISO/IEC 14496-3 subpart 4
// 3 AAC SSR ISO/IEC 14496-3 subpart 4
// 4 AAC LTP ISO/IEC 14496-3 subpart 4
at.SoundRate = codec.SamplingFrequencies[((config1&0x7)<<1)|(config2>>7)]
at.Channels = (config2 >> 3) & 0x0F //声道
//frameLengthFlag = (config2 >> 2) & 0x01
//dependsOnCoreCoder = (config2 >> 1) & 0x01
//extensionFlag = config2 & 0x01
at.timebase = time.Duration(at.SoundRate)
at.Stream.AudioTracks.AddTrack("aac", at)
}
func (at *AudioTrack) Play(onAudio func(uint32, *AudioPack), exit1, exit2 <-chan struct{}) {
ar := at.Clone()
item, ap := ar.Read()
for startTimestamp := item.Timestamp; ; item, ap = ar.Read() {
select {
case <-exit1:
return
case <-exit2:
return
default:
onAudio(uint32(item.Timestamp.Sub(startTimestamp).Milliseconds()), ap.(*AudioPack))
ar.MoveNext()
}
}
}