forked from faiface/beep
/
main.go
212 lines (181 loc) · 4.54 KB
/
main.go
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package main
import (
"fmt"
"os"
"time"
"unicode"
"github.com/faiface/beep"
"github.com/faiface/beep/effects"
"github.com/faiface/beep/mp3"
"github.com/faiface/beep/speaker"
"github.com/gdamore/tcell"
)
func drawTextLine(screen tcell.Screen, x, y int, s string, style tcell.Style) {
for _, r := range s {
screen.SetContent(x, y, r, nil, style)
x++
}
}
type audioPanel struct {
sampleRate beep.SampleRate
streamer beep.StreamSeeker
ctrl *beep.Ctrl
resampler *beep.Resampler
volume *effects.Volume
}
func newAudioPanel(sampleRate beep.SampleRate, streamer beep.StreamSeeker) *audioPanel {
ctrl := &beep.Ctrl{Streamer: beep.Loop(-1, streamer)}
resampler := beep.ResampleRatio(4, 1, ctrl)
volume := &effects.Volume{Streamer: resampler, Base: 2}
return &audioPanel{sampleRate, streamer, ctrl, resampler, volume}
}
func (ap *audioPanel) play() {
speaker.Play(ap.volume)
}
func (ap *audioPanel) draw(screen tcell.Screen) {
mainStyle := tcell.StyleDefault.
Background(tcell.NewHexColor(0x473437)).
Foreground(tcell.NewHexColor(0xD7D8A2))
statusStyle := mainStyle.
Foreground(tcell.NewHexColor(0xDDC074)).
Bold(true)
screen.Fill(' ', mainStyle)
drawTextLine(screen, 0, 0, "Welcome to the Speedy Player!", mainStyle)
drawTextLine(screen, 0, 1, "Press [ESC] to quit.", mainStyle)
drawTextLine(screen, 0, 2, "Press [SPACE] to pause/resume.", mainStyle)
drawTextLine(screen, 0, 3, "Use keys in (?/?) to turn the buttons.", mainStyle)
speaker.Lock()
position := ap.sampleRate.D(ap.streamer.Position())
length := ap.sampleRate.D(ap.streamer.Len())
volume := ap.volume.Volume
speed := ap.resampler.Ratio()
speaker.Unlock()
positionStatus := fmt.Sprintf("%v / %v", position.Round(time.Second), length.Round(time.Second))
volumeStatus := fmt.Sprintf("%.1f", volume)
speedStatus := fmt.Sprintf("%.3fx", speed)
drawTextLine(screen, 0, 5, "Position (Q/W):", mainStyle)
drawTextLine(screen, 16, 5, positionStatus, statusStyle)
drawTextLine(screen, 0, 6, "Volume (A/S):", mainStyle)
drawTextLine(screen, 16, 6, volumeStatus, statusStyle)
drawTextLine(screen, 0, 7, "Speed (Z/X):", mainStyle)
drawTextLine(screen, 16, 7, speedStatus, statusStyle)
}
func (ap *audioPanel) handle(event tcell.Event) (changed, quit bool) {
switch event := event.(type) {
case *tcell.EventKey:
if event.Key() == tcell.KeyESC {
return false, true
}
if event.Key() != tcell.KeyRune {
return false, false
}
switch unicode.ToLower(event.Rune()) {
case ' ':
speaker.Lock()
ap.ctrl.Paused = !ap.ctrl.Paused
speaker.Unlock()
return false, false
case 'q', 'w':
speaker.Lock()
newPos := ap.streamer.Position()
if event.Rune() == 'q' {
newPos -= ap.sampleRate.N(time.Second)
}
if event.Rune() == 'w' {
newPos += ap.sampleRate.N(time.Second)
}
if newPos < 0 {
newPos = 0
}
if newPos >= ap.streamer.Len() {
newPos = ap.streamer.Len() - 1
}
if err := ap.streamer.Seek(newPos); err != nil {
report(err)
}
speaker.Unlock()
return true, false
case 'a':
speaker.Lock()
ap.volume.Volume -= 0.1
speaker.Unlock()
return true, false
case 's':
speaker.Lock()
ap.volume.Volume += 0.1
speaker.Unlock()
return true, false
case 'z':
speaker.Lock()
ap.resampler.SetRatio(ap.resampler.Ratio() * 15 / 16)
speaker.Unlock()
return true, false
case 'x':
speaker.Lock()
ap.resampler.SetRatio(ap.resampler.Ratio() * 16 / 15)
speaker.Unlock()
return true, false
}
}
return false, false
}
func main() {
if len(os.Args) != 2 {
fmt.Fprintf(os.Stderr, "Usage: %s song.mp3\n", os.Args[0])
os.Exit(1)
}
f, err := os.Open(os.Args[1])
if err != nil {
report(err)
}
streamer, format, err := mp3.Decode(f)
if err != nil {
report(err)
}
defer streamer.Close()
speaker.Init(format.SampleRate, format.SampleRate.N(time.Second/30))
screen, err := tcell.NewScreen()
if err != nil {
report(err)
}
err = screen.Init()
if err != nil {
report(err)
}
defer screen.Fini()
ap := newAudioPanel(format.SampleRate, streamer)
screen.Clear()
ap.draw(screen)
screen.Show()
ap.play()
seconds := time.Tick(time.Second)
events := make(chan tcell.Event)
go func() {
for {
events <- screen.PollEvent()
}
}()
loop:
for {
select {
case event := <-events:
changed, quit := ap.handle(event)
if quit {
break loop
}
if changed {
screen.Clear()
ap.draw(screen)
screen.Show()
}
case <-seconds:
screen.Clear()
ap.draw(screen)
screen.Show()
}
}
}
func report(err error) {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}