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examples: add initial speedy-player implementation
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‎examples/speedy-player/main.go‎

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package main
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import (
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"fmt"
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"os"
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"time"
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"github.com/faiface/beep"
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"github.com/faiface/beep/effects"
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"github.com/faiface/beep/mp3"
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"github.com/faiface/beep/speaker"
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"github.com/gdamore/tcell"
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)
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func drawTextLine(screen tcell.Screen, x, y int, s string, style tcell.Style) {
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for _, r := range s {
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screen.SetContent(x, y, r, nil, style)
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x++
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}
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}
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type audioPanel struct {
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sampleRate beep.SampleRate
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streamer beep.StreamSeeker
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ctrl *beep.Ctrl
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resampler *beep.Resampler
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volume *effects.Volume
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}
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func newAudioPanel(sampleRate beep.SampleRate, streamer beep.StreamSeeker) *audioPanel {
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ctrl := &beep.Ctrl{Streamer: beep.Loop(-1, streamer)}
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resampler := beep.ResampleRatio(4, 1, ctrl)
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volume := &effects.Volume{Streamer: resampler, Base: 2}
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return &audioPanel{sampleRate, streamer, ctrl, resampler, volume}
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}
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func (ap *audioPanel) play() {
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speaker.Play(ap.volume)
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}
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func (ap *audioPanel) draw(screen tcell.Screen) {
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mainStyle := tcell.StyleDefault.
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Background(tcell.NewHexColor(0x473437)).
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Foreground(tcell.NewHexColor(0xD7D8A2))
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statusStyle := mainStyle.
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Foreground(tcell.NewHexColor(0xDDC074)).
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Bold(true)
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screen.Fill(' ', mainStyle)
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drawTextLine(screen, 0, 0, "Welcome to the Speedy Player!", mainStyle)
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drawTextLine(screen, 0, 1, "Press [ESC] to quit.", mainStyle)
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drawTextLine(screen, 0, 2, "Press [SPACE] to pause/resume.", mainStyle)
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drawTextLine(screen, 0, 3, "Use keys in (?/?) to turn the buttons.", mainStyle)
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speaker.Lock()
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position := ap.sampleRate.D(ap.streamer.Position())
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length := ap.sampleRate.D(ap.streamer.Len())
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volume := ap.volume.Volume
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speed := ap.resampler.Ratio()
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speaker.Unlock()
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positionStatus := fmt.Sprintf("%v / %v", position.Round(time.Second), length.Round(time.Second))
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volumeStatus := fmt.Sprintf("%.1f", volume)
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speedStatus := fmt.Sprintf("%.3fx", speed)
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drawTextLine(screen, 0, 5, "Position (Q/W):", mainStyle)
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drawTextLine(screen, 16, 5, positionStatus, statusStyle)
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drawTextLine(screen, 0, 6, "Volume (A/S):", mainStyle)
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drawTextLine(screen, 16, 6, volumeStatus, statusStyle)
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drawTextLine(screen, 0, 7, "Speed (Z/X):", mainStyle)
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drawTextLine(screen, 16, 7, speedStatus, statusStyle)
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}
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func (ap *audioPanel) handle(event tcell.Event) (changed, quit bool) {
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switch event := event.(type) {
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case *tcell.EventKey:
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if event.Key() == tcell.KeyESC {
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return false, true
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}
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if event.Key() != tcell.KeyRune {
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return false, false
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}
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switch event.Rune() {
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case ' ':
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speaker.Lock()
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ap.ctrl.Paused = !ap.ctrl.Paused
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speaker.Unlock()
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return false, false
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case 'q', 'Q', 'w', 'W':
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speaker.Lock()
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newPos := ap.streamer.Position()
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if event.Rune() == 'q' || event.Rune() == 'Q' {
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newPos -= ap.sampleRate.N(time.Second)
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}
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if event.Rune() == 'w' || event.Rune() == 'W' {
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newPos += ap.sampleRate.N(time.Second)
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}
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if newPos < 0 {
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newPos = 0
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}
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if newPos >= ap.streamer.Len() {
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newPos = ap.streamer.Len() - 1
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}
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if err := ap.streamer.Seek(newPos); err != nil {
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report(err)
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}
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speaker.Unlock()
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return true, false
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case 'a':
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speaker.Lock()
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ap.volume.Volume -= 0.1
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speaker.Unlock()
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return true, false
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case 's':
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speaker.Lock()
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ap.volume.Volume += 0.1
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speaker.Unlock()
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return true, false
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case 'z':
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speaker.Lock()
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ap.resampler.SetRatio(ap.resampler.Ratio() * 15 / 16)
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speaker.Unlock()
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return true, false
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case 'x':
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speaker.Lock()
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ap.resampler.SetRatio(ap.resampler.Ratio() * 16 / 15)
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speaker.Unlock()
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return true, false
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}
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}
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return false, false
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}
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func main() {
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if len(os.Args) != 2 {
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fmt.Fprintf(os.Stderr, "Usage: %s song.mp3\n", os.Args[0])
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os.Exit(1)
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}
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f, err := os.Open(os.Args[1])
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if err != nil {
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report(err)
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}
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streamer, format, err := mp3.Decode(f)
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if err != nil {
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report(err)
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}
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defer streamer.Close()
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speaker.Init(format.SampleRate, format.SampleRate.N(time.Second/30))
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screen, err := tcell.NewScreen()
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if err != nil {
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report(err)
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}
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err = screen.Init()
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if err != nil {
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report(err)
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}
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defer screen.Fini()
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ap := newAudioPanel(format.SampleRate, streamer)
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screen.Clear()
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ap.draw(screen)
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screen.Show()
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ap.play()
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seconds := time.Tick(time.Second)
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events := make(chan tcell.Event)
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go func() {
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for {
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events <- screen.PollEvent()
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}
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}()
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loop:
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for {
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select {
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case event := <-events:
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changed, quit := ap.handle(event)
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if quit {
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break loop
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}
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if changed {
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screen.Clear()
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ap.draw(screen)
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screen.Show()
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}
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case <-seconds:
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screen.Clear()
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ap.draw(screen)
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screen.Show()
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}
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}
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}
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func report(err error) {
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fmt.Fprintln(os.Stderr, err)
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os.Exit(1)
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}

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