func main() {
flag.Parse()
sequencer := NewSequencer()
for _, file := range flag.Args() {
pattern, err := drum.DecodeFile(file)
if err != nil {
log.Fatal(err)
}
if err := sequencer.Add(pattern); err != nil {
log.Fatal(err)
}
log.Print(pattern.String())
}
portaudio.Initialize()
defer portaudio.Terminate()
stream, err := portaudio.OpenDefaultStream(0, 2, 44100, 0, func(o []int32) {
sequencer.Read(o)
})
if err != nil {
log.Fatal(err)
}
defer stream.Close()
stream.Start()
defer stream.Stop()
sequencer.Start()
for {
time.Sleep(time.Second)
}
}
func main() {
flag.Parse()
portaudio.Initialize()
defer portaudio.Terminate()
portmidi.Initialize()
defer portmidi.Terminate()
if *doDemo {
if err := demo(); err != nil {
log.Println(err)
}
return
}
http.Handle("/", http.FileServer(http.Dir("static")))
http.HandleFunc("/socket", socketHandler)
go func() {
if err := http.ListenAndServe(*listenAddr, nil); err != nil {
log.Println(err)
}
}()
os.Stdout.Write([]byte("Press enter to stop...\n"))
os.Stdin.Read([]byte{0})
}
func main() {
portaudio.Initialize()
defer portaudio.Terminate()
hs, err := portaudio.HostApis()
chk(err)
err = tmpl.Execute(os.Stdout, hs)
chk(err)
}
func main() {
sampleRate := 44100
blockSize := 205 * sampleRate / 8000
window := blockSize / 4
dt := dtmf.NewStandard(sampleRate, blockSize)
lastKey := -1
keyCount := 0
samples := make([]float32, blockSize)
if err := portaudio.Initialize(); err != nil {
log.Fatalf("Initialize: %+v", err)
}
defer func() {
if err := portaudio.Terminate(); err != nil {
log.Fatalf("Terminate: %+v", err)
}
}()
inputBuf := make([]float32, window)
stream, err := portaudio.OpenDefaultStream(1, 0, float64(sampleRate), len(inputBuf), inputBuf)
if err != nil {
log.Fatalf("OpenDefaultStream: %+v", err)
}
defer stream.Close()
if err := stream.Start(); err != nil {
log.Fatalf("Start: %+v", err)
}
defer stream.Stop()
fmt.Printf("%+v\n", stream.Info())
sig := make(chan os.Signal, 1)
signal.Notify(sig, os.Interrupt, os.Kill)
for {
if err := stream.Read(); err != nil {
log.Fatalf("Read: %+v", err)
}
copy(samples, samples[window:])
copy(samples[len(samples)-len(inputBuf):], inputBuf)
if k, t := dt.Feed(samples); k == lastKey && t > 0.0 {
keyCount++
if keyCount == 10 {
fmt.Printf("%c", dtmf.Keypad[k])
}
} else {
lastKey = k
keyCount = 0
}
select {
case <-sig:
fmt.Println()
return
default:
}
}
}
func main() {
portaudio.Initialize()
defer portaudio.Terminate()
s := newStereoSine(256, 320, sampleRate)
defer s.Close()
chk(s.Start())
time.Sleep(2 * time.Second)
chk(s.Stop())
}
func main() {
portaudio.Initialize()
defer portaudio.Terminate()
e := newEcho(time.Second / 3)
defer e.Close()
chk(e.Start())
time.Sleep(4 * time.Second)
chk(e.Stop())
}
// Play will play the given pattern.
// It will generate different sounds for each instrument
// every time it is called. For simplification, those sounds
// are just sine waves.
func (p *Pattern) Play(playingTime time.Duration) error {
// Initialize portaudio
portaudio.Initialize()
defer portaudio.Terminate()
stream, err := portaudio.OpenDefaultStream(0, 1, sampleRate, 0, processAudio)
if err != nil {
return errors.New("could not open default stream")
}
defer stream.Close()
// Create random tone map
toneMap = make(map[byte]*tone)
rand.Seed(time.Now().Unix())
for i := range p.instruments {
var err error
toneMap[i], err = newTone(rand.Float64()*600+300, sampleRate)
if err != nil {
return fmt.Errorf("could not create tone for instrument %v", i)
}
}
stream.Start()
defer stream.Stop()
// Signal for stopping
timeOut := time.After(playingTime)
timePerStep := time.Duration(60/p.header.BPM*1000) * time.Millisecond
ticker := time.NewTicker(timePerStep)
currentStep := 0
// Play!
for _ = range ticker.C {
for i, instrument := range p.instruments {
if instrument.Pattern[currentStep] == 0 {
toneMap[i].playing = false
} else {
toneMap[i].playing = true
}
}
currentStep++
if currentStep > 15 {
currentStep = 0
}
select {
case <-timeOut:
ticker.Stop()
return nil
default:
}
}
return nil
}
func (p *port) Dispose() {
portInitCount--
if portInitCount == 0 {
portaudio.Terminate()
}
if p.st != nil {
_ = p.st.Stop() // ignore error
p.st.Close()
}
}
func sineLogon() {
portaudio.Initialize()
defer portaudio.Terminate()
s := newStereoSine(132, 198/2, sampleRate)
defer s.Close()
chk(s.Start())
doADSR(s, 0.4, 0.1, 0.1)
doADSR(s, 0.1, 0.8, 0.9)
// wait for buffer to drain
time.Sleep(500 * time.Millisecond)
chk(s.Stop())
}
func sineMain(ch *amqp.Channel) {
go sniffy()
q, err := ch.QueueDeclare(
"", // name
false, // durable
false, // delete when usused
true, // exclusive
false, // no-wait
nil, // arguments
)
failOnError(err, "Failed to declare a queue")
err = ch.QueueBind(
q.Name, // queue name
"", // routing key
"bpm", // exchange
false,
nil)
failOnError(err, "Failed to bind a queue")
msgs, err := ch.Consume(
q.Name, // queue
"", // consumer
true, // auto-ack
false, // exclusive
false, // no-local
false, // no-wait
nil, // args
)
failOnError(err, "Failed to register a consumer")
portaudio.Initialize()
defer portaudio.Terminate()
//s := newStereoSine(256, 320, sampleRate)
s := newStereoSine(220, 220, sampleRate)
defer s.Close()
chk(s.Start())
defer s.Stop()
for m := range msgs {
var bm BpmMsg
err := json.Unmarshal(m.Body, &bm)
if err != nil {
fmt.Println("blah", err)
}
bpm = bm.Bpm
}
}
func main() {
portaudio.Initialize()
defer portaudio.Terminate()
h, err := portaudio.DefaultHostApi()
chk(err)
stream, err := portaudio.OpenStream(portaudio.HighLatencyParameters(nil, h.DefaultOutputDevice), func(out []int32) {
for i := range out {
out[i] = int32(rand.Uint32())
}
})
chk(err)
defer stream.Close()
chk(stream.Start())
time.Sleep(time.Second)
chk(stream.Stop())
}
func main() {
flag.Usage = func() {
fmt.Fprint(os.Stderr, usage)
flag.PrintDefaults()
os.Exit(2)
}
flag.Parse()
if flag.NArg() != 1 {
flag.Usage()
}
p, err := drum.DecodeFile(flag.Arg(0))
if err != nil {
log.Fatalf("cannot decode splice file: %v", err)
}
if *showInfo {
fmt.Print(p)
return
}
patches, err := readPatches(p, *sampleDir)
if err != nil {
log.Fatalf("cannot read sample patches: %v", err)
}
drumMod, err := drummachine.New(p, patches)
if err != nil {
log.Fatalf("cannot make new drum machine: %v", err)
}
portaudio.Initialize()
defer portaudio.Terminate()
portmidi.Initialize()
defer portmidi.Terminate()
e := audio.NewEngine()
e.Input("in", drumMod)
if err := e.Start(); err != nil {
panic(err)
}
select {}
}
func Run(paths []string) {
// initialize audio
portaudio.Initialize()
defer portaudio.Terminate()
audio := NewAudio()
if err := audio.Start(); err != nil {
log.Fatalln(err)
}
defer audio.Stop()
// initialize glfw
if err := glfw.Init(); err != nil {
log.Fatalln(err)
}
defer glfw.Terminate()
// create window
glfw.WindowHint(glfw.ContextVersionMajor, 2)
glfw.WindowHint(glfw.ContextVersionMinor, 1)
window, err := glfw.CreateWindow(width*scale, height*scale, title, nil, nil)
if err != nil {
log.Fatalln(err)
}
window.MakeContextCurrent()
// initialize gl
if err := gl.Init(); err != nil {
log.Fatalln(err)
}
gl.Enable(gl.TEXTURE_2D)
// run director
director := NewDirector(window, audio)
director.Start(paths)
}
// Play an AIFF file using PortAudio
// Base on example code from: https://code.google.com/p/portaudio-go/source/browse/portaudio/examples/play.go
func PlayAIFF(p string, sig chan int) error {
f, err := os.Open(p)
if err != nil {
return err
}
defer f.Close()
id, data, err := readChunk(f)
if err != nil {
return err
}
if id.String() != "FORM" {
return ErrBadFileFormat
}
_, err = data.Read(id[:])
if err != nil {
return err
}
if id.String() != "AIFF" {
return ErrBadFileFormat
}
var c commonChunk
var audio io.Reader
for {
id, chunk, err := readChunk(data)
if err == io.EOF {
break
}
if err != nil {
return err
}
switch id.String() {
case "COMM":
err = binary.Read(chunk, binary.BigEndian, &c)
if err != nil {
return err
}
case "SSND":
chunk.Seek(8, 1) //ignore offset and block
audio = chunk
default:
fmt.Printf("ignoring unknown chunk '%s'\n", id)
}
}
//assume 44100 sample rate, mono, 32 bit
portaudio.Initialize()
defer portaudio.Terminate()
out := make([]int32, 8192)
stream, err := portaudio.OpenDefaultStream(0, 1, 44100, len(out), &out)
if err != nil {
return err
}
defer stream.Close()
err = stream.Start()
if err != nil {
return err
}
defer stream.Stop()
for remaining := int(c.NumSamples); remaining > 0; remaining -= len(out) {
if len(out) > remaining {
out = out[:remaining]
}
err := binary.Read(audio, binary.BigEndian, out)
if err == io.EOF {
break
}
if err != nil {
return err
}
err = stream.Write()
if err != nil {
return err
}
select {
case <-sig:
return nil
default:
}
}
return nil
}
func main() {
if len(os.Args) != 2 {
fmt.Println("usage: tdrum file.splice")
os.Exit(1)
}
pattern, err := drum.DecodeFile(os.Args[1])
if err != nil {
fmt.Printf("error: %s\n", err)
os.Exit(1)
}
sequencer = NewSequencer()
if err := sequencer.Add(pattern); err != nil {
fmt.Printf("error: %s\n", err)
os.Exit(1)
}
portaudio.Initialize()
defer portaudio.Terminate()
stream, err := portaudio.OpenDefaultStream(0, 2, 44100, 0, func(o []int32) {
sequencer.Read(o)
})
if err != nil {
log.Fatal(err)
}
defer stream.Close()
stream.Start()
defer stream.Stop()
if err := termbox.Init(); err != nil {
panic(err)
}
defer termbox.Close()
termbox.SetOutputMode(termbox.Output256)
eq := make(chan termbox.Event)
go func() {
for {
eq <- termbox.PollEvent()
}
}()
draw(pattern)
loop:
for {
select {
case ev := <-eq:
if ev.Type == termbox.EventKey && ev.Key == termbox.KeyEsc {
break loop
}
if ev.Type == termbox.EventKey && ev.Key == termbox.KeySpace {
if sequencer.Running {
sequencer.Reset()
} else {
sequencer.Start()
}
}
default:
draw(pattern)
time.Sleep(time.Millisecond * 2)
}
}
}
func main() {
flag.Parse()
//cmds := []string{"ls", "exit", "jobbie"}
PS2 := ansi.Color("#CMDSine> ", "magenta")
signalChan := make(chan SoundGen)
tickChan := make(chan int)
go ticker(tickChan)
// go fib(tickerChan)
portaudio.Initialize()
defer portaudio.Terminate()
m := newMixer()
go m.mix(signalChan)
go func() {
log.Println(http.ListenAndServe("localhost:6060", nil))
}()
// Check GOMAXPROCS
max_procs := runtime.GOMAXPROCS(-1)
num_procs_to_set := runtime.NumCPU()
if max_procs != num_procs_to_set {
runtime.GOMAXPROCS(num_procs_to_set)
}
// non-interactive - running Prime loop
if *pflag == true {
forevs := make(chan bool)
go primez(signalChan, tickChan)
<-forevs
}
shellReader := bufio.NewReader(os.Stdin)
for {
// SETUP && LOOP
fmt.Printf(PS2)
input, err := shellReader.ReadString('\n')
if err != nil {
if err.Error() == "EOF" {
myexit()
} else {
fmt.Println("Got an err for ye: ", err)
}
}
input = strings.TrimSpace(input)
// ALL DA REGEX FROM HERE ON OUT..
// SET OFF PRIME TRACK
prx, _ := regexp.MatchString("^prime$", input)
if prx {
go primez(signalChan, tickChan)
}
// SET BPM
bpmre := regexp.MustCompile("^bpm +([0-9]+)$")
br := bpmre.FindStringSubmatch(input)
if len(br) == 2 {
bpmval, err := strconv.ParseFloat(br[1], 64)
if err != nil {
fmt.Println("Choked on your Beats Per Minute, mate..")
continue
}
bpm = bpmval
tickLength = 60000 / bpm / 60
loopLength = tickLength * 16
}
// CREATE SINE w/ FREQ
re := regexp.MustCompile("^sine +([0-9]+)$")
sf := re.FindStringSubmatch(input)
if len(sf) == 2 {
freq, err := strconv.ParseFloat(sf[1], 64)
if err != nil {
fmt.Println("Choked on your sine freq, mate..")
continue
}
newSine(signalChan, freq)
}
// SET SINE ATTRIB
// ssx := regexp.MustCompile("^set sine ([0-9]) ([a-z]+) ([0-9\\.]+)$")
// ssxf := ssx.FindStringSubmatch(input)
// if len(ssxf) == 4 {
// sineNum, err := strconv.Atoi(ssxf[1])
// if err != nil {
// fmt.Println(err)
// continue
// }
// attrib := ssxf[2]
// val, err := strconv.ParseFloat(ssxf[3], 64)
// if err != nil {
// fmt.Println(err)
// continue
// }
// if sineNum < len(m.signals) {
// m.signals[sineNum].set(attrib, val)
// }
// }
// CREATE FREQMOD
fmx := regexp.MustCompile("^fm +([0-9]+) +([0-9]+)$")
fmxr := fmx.FindStringSubmatch(input)
// if len(fmxr) == 2 {
if len(fmxr) > 1 {
fmt.Println("New FM!")
car, err := strconv.ParseFloat(fmxr[1], 64)
if err != nil {
fmt.Println("Choked on your carrier freq, mate..")
continue
}
mod, err := strconv.ParseFloat(fmxr[2], 64)
if err != nil {
fmt.Println("Choked on your modulator freq, mate..")
continue
}
newFM(signalChan, car, mod)
}
// PROCESS LIST
psx, _ := regexp.MatchString("^ps$", input)
if psx {
fmt.Printf("///CMDSine:: bpm: %.0f \\\\\\\n", bpm)
m.listChans()
fmt.Println()
}
}
}
// Stop shuts down PortAudio
func (a *Audio) Stop() {
portaudio.Terminate()
}
func main() {
if len(os.Args) < 2 {
fmt.Println("missing required argument: output file name")
return
}
fmt.Println("Recording. Press Ctrl-C to stop.")
sig := make(chan os.Signal, 1)
signal.Notify(sig, os.Interrupt, os.Kill)
fileName := os.Args[1]
if !strings.HasSuffix(fileName, ".aiff") {
fileName += ".aiff"
}
f, err := os.Create(fileName)
chk(err)
// form chunk
_, err = f.WriteString("FORM")
chk(err)
chk(binary.Write(f, binary.BigEndian, int32(0))) //total bytes
_, err = f.WriteString("AIFF")
chk(err)
// common chunk
_, err = f.WriteString("COMM")
chk(err)
chk(binary.Write(f, binary.BigEndian, int32(18))) //size
chk(binary.Write(f, binary.BigEndian, int16(1))) //channels
chk(binary.Write(f, binary.BigEndian, int32(0))) //number of samples
chk(binary.Write(f, binary.BigEndian, int16(32))) //bits per sample
_, err = f.Write([]byte{0x40, 0x0e, 0xac, 0x44, 0, 0, 0, 0, 0, 0}) //80-bit sample rate 44100
chk(err)
// sound chunk
_, err = f.WriteString("SSND")
chk(err)
chk(binary.Write(f, binary.BigEndian, int32(0))) //size
chk(binary.Write(f, binary.BigEndian, int32(0))) //offset
chk(binary.Write(f, binary.BigEndian, int32(0))) //block
nSamples := 0
defer func() {
// fill in missing sizes
totalBytes := 4 + 8 + 18 + 8 + 8 + 4*nSamples
_, err = f.Seek(4, 0)
chk(err)
chk(binary.Write(f, binary.BigEndian, int32(totalBytes)))
_, err = f.Seek(22, 0)
chk(err)
chk(binary.Write(f, binary.BigEndian, int32(nSamples)))
_, err = f.Seek(42, 0)
chk(err)
chk(binary.Write(f, binary.BigEndian, int32(4*nSamples+8)))
chk(f.Close())
}()
portaudio.Initialize()
defer portaudio.Terminate()
in := make([]int32, 64)
stream, err := portaudio.OpenDefaultStream(1, 0, 44100, len(in), in)
chk(err)
defer stream.Close()
chk(stream.Start())
for {
chk(stream.Read())
chk(binary.Write(f, binary.BigEndian, in))
nSamples += len(in)
select {
case <-sig:
return
default:
}
}
chk(stream.Stop())
}
// Play attempts to play the specified pattern for 'n' seconds on the
// default audio output device on the current system. An error is
// returned if the audio could not be played correctly.
func Play(pt *Pattern, n int) error {
// Validate that all tracks present in our pattern have sound files loaded.
for _, tr := range pt.Tracks {
_, ok := tracks[strings.ToLower(tr.Name)+".wav"]
if !ok {
return fmt.Errorf("track %s could not be found, required to play pattern", tr.Name)
}
}
// Let's do some math first. At a tempo of 120 (bpm), we play 2 beats per second.
// That means each beat takes 0.5 seconds. A beat is comprised of a quarter note,
// which in turn is comprised of 4 steps. This means, each step takes 0.125 seconds.
// The time taken by a step is what we are interested in, as that is what we will
// use to schedule the playing of sounds.
beatTime := 1.0 / (pt.Tempo / 60.0)
stepTime := beatTime / 4.0
// Initialize a list that represents our play queue. This is a list of
// sounds that are queued up for playback.
var queue = list.New()
// We need to keep track of how many steps have been played so far.
// This is always a value between 0 and 15 (since our tracks have a fixed
// 16 steps). We also track the last time a step was played, so we know
// when we can schedule the next.
lastStep := 0
lastStepPlayed := time.Duration(0)
// Initialize portaudio.
err := portaudio.Initialize()
if err != nil {
return err
}
defer portaudio.Terminate()
// Let's open a stream up and configure our callback.
stream, err := portaudio.OpenDefaultStream(0, numChannels, sampleRate, framesPerBuffer, func(output buffer, info portaudio.StreamCallbackTimeInfo) {
// If sufficient time has passed since we last played a step, queue up the next.
if info.OutputBufferDacTime-lastStepPlayed >= time.Duration(stepTime*float32(time.Second)) {
for _, tr := range pt.Tracks {
// Is this track scheduled to be played at this step?
if tr.Steps[lastStep] == 0x1 {
queue.PushBack(&queueItem{tracks[strings.ToLower(tr.Name)+".wav"], 0})
}
}
lastStepPlayed = info.OutputBufferDacTime
lastStep++
if lastStep > 15 {
lastStep = 0
}
}
// Multiplex all queued sounds and play them.
multiplexSounds(output, queue)
})
if err != nil {
return err
}
// Let's play some drums!
err = stream.Start()
if err != nil {
return err
}
// For 'n' seconds....
time.Sleep(time.Duration(n) * time.Second)
// Stop and cleanup.
err = stream.Stop()
if err != nil {
return err
}
err = stream.Close()
if err != nil {
return err
}
return nil
}
func main() {
if len(os.Args) < 2 {
fmt.Println("missing required argument: input file name")
return
}
fmt.Println("Playing. Press Ctrl-C to stop.")
sig := make(chan os.Signal, 1)
signal.Notify(sig, os.Interrupt, os.Kill)
fileName := os.Args[1]
f, err := os.Open(fileName)
chk(err)
defer f.Close()
id, data, err := readChunk(f)
chk(err)
if id.String() != "FORM" {
fmt.Println("bad file format")
return
}
_, err = data.Read(id[:])
chk(err)
if id.String() != "AIFF" {
fmt.Println("bad file format")
return
}
var c commonChunk
var audio io.Reader
for {
id, chunk, err := readChunk(data)
if err == io.EOF {
break
}
chk(err)
switch id.String() {
case "COMM":
chk(binary.Read(chunk, binary.BigEndian, &c))
case "SSND":
chunk.Seek(8, 1) //ignore offset and block
audio = chunk
default:
fmt.Printf("ignoring unknown chunk '%s'\n", id)
}
}
//assume 44100 sample rate, mono, 32 bit
portaudio.Initialize()
defer portaudio.Terminate()
out := make([]int32, 8192)
stream, err := portaudio.OpenDefaultStream(0, 1, 44100, len(out), &out)
chk(err)
defer stream.Close()
chk(stream.Start())
defer stream.Stop()
for remaining := int(c.NumSamples); remaining > 0; remaining -= len(out) {
if len(out) > remaining {
out = out[:remaining]
}
err := binary.Read(audio, binary.BigEndian, out)
if err == io.EOF {
break
}
chk(err)
chk(stream.Write())
select {
case <-sig:
return
default:
}
}
}