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Add ONVIF backchannel functionality with G711 encoding
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,80 @@ | ||
| package components | ||
|
|
||
| import ( | ||
| "bufio" | ||
| "fmt" | ||
| "os" | ||
| "time" | ||
|
|
||
| "github.com/kerberos-io/agent/machinery/src/log" | ||
| "github.com/kerberos-io/agent/machinery/src/models" | ||
| "github.com/kerberos-io/joy4/av" | ||
| "github.com/zaf/g711" | ||
| ) | ||
|
|
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| func GetBackChannelAudioCodec(streams []av.CodecData, communication *models.Communication) av.AudioCodecData { | ||
| for _, stream := range streams { | ||
| if stream.Type().IsAudio() { | ||
| if stream.Type().String() == "PCM_MULAW" { | ||
| pcmuCodec := stream.(av.AudioCodecData) | ||
| if pcmuCodec.IsBackChannel() { | ||
| communication.HasBackChannel = true | ||
| return pcmuCodec | ||
| } | ||
| } | ||
| } | ||
| } | ||
| return nil | ||
| } | ||
|
|
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| func WriteAudioToBackchannel(infile av.DemuxCloser, streams []av.CodecData, communication *models.Communication) { | ||
| log.Log.Info("WriteAudioToBackchannel: looking for backchannel audio codec") | ||
|
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| pcmuCodec := GetBackChannelAudioCodec(streams, communication) | ||
| if pcmuCodec != nil { | ||
| log.Log.Info("WriteAudioToBackchannel: found backchannel audio codec") | ||
|
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| length := 0 | ||
| channel := pcmuCodec.GetIndex() * 2 // This is the same calculation as Interleaved property in the SDP file. | ||
| for audio := range communication.HandleAudio { | ||
| // Encode PCM to MULAW | ||
| var bufferUlaw []byte | ||
| for _, v := range audio.Data { | ||
| b := g711.EncodeUlawFrame(v) | ||
| bufferUlaw = append(bufferUlaw, b) | ||
| } | ||
| infile.Write(bufferUlaw, channel, uint32(length)) | ||
| length = (length + len(bufferUlaw)) % 65536 | ||
| time.Sleep(128 * time.Millisecond) | ||
| } | ||
| } | ||
| log.Log.Info("WriteAudioToBackchannel: finished") | ||
|
|
||
| } | ||
|
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| func WriteFileToBackChannel(infile av.DemuxCloser) { | ||
| // Do the warmup! | ||
| file, err := os.Open("./audiofile.bye") | ||
| if err != nil { | ||
| fmt.Println("WriteFileToBackChannel: error opening audiofile.bye file") | ||
| } | ||
| defer file.Close() | ||
|
|
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| // Read file into buffer | ||
| reader := bufio.NewReader(file) | ||
| buffer := make([]byte, 1024) | ||
|
|
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| count := 0 | ||
| for { | ||
| _, err := reader.Read(buffer) | ||
| if err != nil { | ||
| break | ||
| } | ||
| // Send to backchannel | ||
| fmt.Println(buffer) | ||
| infile.Write(buffer, 2, uint32(count)) | ||
|
|
||
| count = count + 1024 | ||
| time.Sleep(128 * time.Millisecond) | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,6 @@ | ||
| package models | ||
|
|
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| type AudioDataPartial struct { | ||
| Timestamp int64 `json:"timestamp" bson:"timestamp"` | ||
| Data []int16 `json:"data" bson:"data"` | ||
| } |
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