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package bot |
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import ( |
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"bufio" |
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"encoding/binary" |
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"errors" |
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"fmt" |
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"io" |
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"os/exec" |
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"strconv" // https://github.com/layeh/gopus |
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"github.com/FlameInTheDark/gopus" |
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"github.com/bwmarrin/discordgo" |
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) |
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const ( |
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// CHANNELS count of audio channels |
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CHANNELS int = 2 |
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// FRAME_RATE ... |
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FRAME_RATE int = 48000 |
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// FRAME_SIZE ... |
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FRAME_SIZE int = 960 |
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// MAX_BYTES max bytes per sample |
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MAX_BYTES int = (FRAME_SIZE * 2) * 2 |
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) |
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// Play start playback |
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func (connection *Connection) Play(source string, volume float32) error { |
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if connection.playing { |
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return errors.New("song already playing") |
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} |
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ffmpeg := exec.Command("ffmpeg", "-i", source, "-f", "s16le", "-reconnect", "1", "-reconnect_at_eof", "1", "-reconnect_streamed", "1", "-reconnect_delay_max", "2", "-filter:a", fmt.Sprintf("volume=%.3f", volume), "-ar", strconv.Itoa(FRAME_RATE), "-ac", strconv.Itoa(CHANNELS), "pipe:1") |
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defer func() { |
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fferr := ffmpeg.Process.Kill() |
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if fferr != nil { |
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fmt.Println("FFMPEG close err: ", fferr) |
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} |
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}() |
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connection.stopRunning = false |
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out, err := ffmpeg.StdoutPipe() |
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if err != nil { |
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return err |
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} |
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buffer := bufio.NewReaderSize(out, 16384) |
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err = ffmpeg.Start() |
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if err != nil { |
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return err |
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} |
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connection.playing = true |
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defer func() { |
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connection.playing = false |
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}() |
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_ = connection.voiceConnection.Speaking(true) |
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defer func() { _ = connection.voiceConnection.Speaking(false) }() |
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if connection.send == nil { |
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connection.send = make(chan []int16, 2) |
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} |
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go connection.sendPCM(connection.voiceConnection, connection.send) |
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for { |
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if connection.stopRunning { |
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_ = ffmpeg.Process.Kill() |
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break |
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} |
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audioBuffer := make([]int16, FRAME_SIZE*CHANNELS) |
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err = binary.Read(buffer, binary.LittleEndian, &audioBuffer) |
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if err == io.EOF || err == io.ErrUnexpectedEOF { |
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return nil |
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} |
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if err != nil { |
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return err |
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} |
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connection.send <- audioBuffer |
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} |
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return nil |
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} |
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// sendPCM sends pulse code modulation to discord voice channel |
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func (connection *Connection) sendPCM(voice *discordgo.VoiceConnection, pcm <-chan []int16) { |
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connection.lock.Lock() |
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if connection.sendpcm || pcm == nil { |
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connection.lock.Unlock() |
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return |
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} |
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connection.sendpcm = true |
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connection.lock.Unlock() |
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defer func() { |
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connection.sendpcm = false |
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}() |
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encoder, err := gopus.NewEncoder(FRAME_RATE, CHANNELS, gopus.Audio) |
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if err != nil { |
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fmt.Println("NewEncoder error,", err) |
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return |
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} |
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for { |
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receive, ok := <-pcm |
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if !ok { |
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fmt.Println("PCM channel closed") |
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return |
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} |
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opus, err := encoder.Encode(receive, FRAME_SIZE, MAX_BYTES) |
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if err != nil { |
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fmt.Println("Encoding error,", err) |
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return |
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} |
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if !voice.Ready || voice.OpusSend == nil { |
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fmt.Printf("Discordgo not ready for opus packets. %+v : %+v", voice.Ready, voice.OpusSend) |
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return |
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} |
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voice.OpusSend <- opus |
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} |
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} |
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// PlayYoutube starts playing song from youtube |
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func (connection *Connection) PlayYoutube(ffmpeg *exec.Cmd) error { |
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if connection.playing { |
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return errors.New("song already playing") |
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} |
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connection.stopRunning = false |
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out, err := ffmpeg.StdoutPipe() |
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if err != nil { |
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return err |
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} |
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buffer := bufio.NewReaderSize(out, 16384) |
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err = ffmpeg.Start() |
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if err != nil { |
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return err |
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} |
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connection.playing = true |
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defer func() { |
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connection.playing = false |
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}() |
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_ = connection.voiceConnection.Speaking(true) |
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defer func() { _ = connection.voiceConnection.Speaking(false) }() |
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if connection.send == nil { |
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connection.send = make(chan []int16, 2) |
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} |
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go connection.sendPCM(connection.voiceConnection, connection.send) |
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for { |
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if connection.stopRunning { |
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fmt.Println("Closing ffmpeg...") |
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_ = ffmpeg.Process.Kill() |
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break |
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} |
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audioBuffer := make([]int16, FRAME_SIZE*CHANNELS) |
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err = binary.Read(buffer, binary.LittleEndian, &audioBuffer) |
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if err == io.EOF || err == io.ErrUnexpectedEOF { |
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return nil |
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} |
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if err != nil { |
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return err |
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} |
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connection.send <- audioBuffer |
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} |
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return nil |
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} |
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// Stop stops playback |
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func (connection *Connection) Stop() { |
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connection.stopRunning = true |
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connection.playing = false |
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} |
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FlameInTheDark /
dtbot
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