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3 changed files with 32 additions and 43 deletions

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@ -20,16 +20,16 @@ milkbucket reads a PCM stream from standard input to generate visualizations.
If you have an audio file and a preset in mind, you can use `ffmpeg` to
generate the PCM stream, then pipe to milkbucket, like so:
```
ffmpeg -i $audio -ar 44100 -f s16le - | ./milkbucket $preset
ffmpeg -i $audio -ar 44100 -f s16le - | ./milkbucket -p $preset
```
Note that you can pass in multiple presets, then use the arrow keys to cycle
through the presets while running.
Note that you can pass in multiple presets with multiple `-p` flags, then use
the arrow keys to cycle through the presets while running.
Note that neither of these commands (ffmpeg or milkbucket) will output any
audio! If you want to hear the audio at the same time (and assuming your
machine uses pipewire), run:
```
ffmpeg -i $audio -ar 44100 -f s16le - | tee >(pw-play --rate=44100 --format=s16 -) | ./milkbucket $preset
ffmpeg -i $audio -ar 44100 -f s16le - | tee >(pw-play --rate=44100 --format=s16 -) | ./milkbucket -p $preset
```
(If you don't use pipewire try using `aplay` instead of `pw-play`, or some
other command for playing PCM streams.)
@ -37,5 +37,5 @@ other command for playing PCM streams.)
You can also generate a visualization from your system sound. Assuming pipewire
again, and that you have audio coming from Firefox, run:
```
pw-record --target Firefox - | ./milkbucket $preset
pw-record --target Firefox - | ./milkbucket -p $preset
```

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@ -20,12 +20,14 @@ import (
"encoding/binary"
"errors"
"io"
"log"
"os"
"github.com/spf13/cobra"
"github.com/veandco/go-sdl2/sdl"
)
var presets []string
var transition bool
/*
@ -44,29 +46,16 @@ func checkStdin() error {
}
/*
* validatePreset performs some basic checks on the preset passed in and
* validatePresets performs some basic checks on the presets passed in and
* returns an error if it finds a problem.
*/
func validatePreset(preset string) error {
info, err := os.Stat(preset)
func validatePresets() error {
for _, p := range presets {
info, err := os.Stat(p)
if err != nil {
return err
} else if info.IsDir() {
return errors.New("preset " + preset + " is a directory")
}
return nil
}
/*
* validatePresets validates each preset passed in and returns an error if it
* finds a problem.
*/
func validatePresets(cmd *cobra.Command, args []string) error {
for _, p := range args {
err := validatePreset(p)
if err != nil {
return err
return errors.New("preset " + p + " is a directory")
}
}
@ -147,43 +136,45 @@ func update(m *milkDropWindow) (bool, error) {
func milkbucket(cmd *cobra.Command, args []string) {
err := checkStdin()
if err != nil {
cobra.CheckErr(err)
log.Fatal(err)
}
err = sdl.Init(sdl.INIT_VIDEO)
if err != nil {
cobra.CheckErr(err)
log.Fatal(err)
}
defer sdl.Quit()
m, err := newMilkDropWindow(800, 600, args)
err = validatePresets()
if err != nil {
cobra.CheckErr(err)
log.Fatal(err)
}
m, err := newMilkDropWindow(800, 600, presets)
if err != nil {
log.Fatal(err)
}
defer m.destroy()
if len(args) > 0 {
m.loadPreset(false)
}
running := true
for running {
running, err = update(m)
if err != nil {
cobra.CheckErr(err)
log.Fatal(err)
}
}
}
// rootCmd represents the base command when called without any subcommands
var rootCmd = &cobra.Command{
Use: "milkbucket [presets]",
Use: "milkbucket",
Short: "Audio visualizer",
Long: `milkbucket is an audio visualizer.
It uses Milkdrop preset files to generate visualizations from standard input.`,
Run: milkbucket,
Args: validatePresets,
}
// Execute adds all child commands to the root command and sets flags appropriately.
@ -203,4 +194,6 @@ func init() {
// Cobra also supports local flags, which will only run
// when this action is called directly.
rootCmd.Flags().BoolVarP(&transition, "transition", "t", false, "smoothly transition between presets")
rootCmd.Flags().StringArrayVarP(&presets, "presets", "p", []string{}, "preset files to use")
}

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@ -67,10 +67,8 @@ func (m *milkDropWindow) setupPresets(presets []string) {
* preset.
*/
func (m *milkDropWindow) nextPreset(smooth bool) {
if m.preset.Len() > 0 {
m.preset = m.preset.Next()
m.loadPreset(smooth)
}
}
/*
@ -78,10 +76,8 @@ func (m *milkDropWindow) nextPreset(smooth bool) {
* preset.
*/
func (m *milkDropWindow) prevPreset(smooth bool) {
if m.preset.Len() > 0 {
m.preset = m.preset.Prev()
m.loadPreset(smooth)
}
}
/*