func ErrMain() error {
if len(os.Args) < 3 {
return errors.New("Usage: wav-join <input.wav> [<another.wav> ...] " +
"<output.wav>")
}
s, err := wav.ReadSoundFile(os.Args[1])
if err != nil {
return err
}
for _, f := range os.Args[2 : len(os.Args)-1] {
nextS, err := wav.ReadSoundFile(f)
if err != nil {
return err
}
wav.Append(s, nextS)
}
return wav.WriteFile(s, os.Args[len(os.Args)-1])
}
func ErrMain() error {
if len(os.Args) != 5 {
return errors.New("Usage: wav-overlay <input.wav> <overlay.wav> " +
"<start> <output.wav>")
}
start, err := strconv.ParseFloat(os.Args[3], 64)
if err != nil {
return err
}
s1, err := wav.ReadSoundFile(os.Args[1])
if err != nil {
return err
}
s2, err := wav.ReadSoundFile(os.Args[2])
if err != nil {
return err
}
wav.Volume(s1, 0.5)
wav.Volume(s2, 0.5)
wav.Overlay(s1, s2, time.Duration(start*float64(time.Second)))
return wav.WriteFile(s1, os.Args[4])
}
func ErrMain() error {
if len(os.Args) != 4 {
return errors.New("Usage: wav-volume <file.wav> <volume> <output.wav>")
}
s, err := wav.ReadSoundFile(os.Args[1])
if err != nil {
return err
}
scale, err := strconv.ParseFloat(os.Args[2], 64)
if err != nil {
return err
}
wav.Volume(s, scale)
return wav.WriteFile(s, os.Args[3])
}
// ReadAudioFile reads an audio file and converts it
// into a sequence of MFCC vectors.
func ReadAudioFile(file string) ([]linalg.Vector, error) {
wavFile, err := wav.ReadSoundFile(file)
if err != nil {
return nil, err
}
var audioData []float64
for i, x := range wavFile.Samples() {
if i%wavFile.Channels() == 0 {
audioData = append(audioData, float64(x))
}
}
return SeqForAudioSamples(audioData, wavFile.SampleRate()), nil
}
func ErrMain() error {
if len(os.Args) != 5 {
return errors.New("Usage: wav-gradient <file.wav> <start> <end> " +
"<output.wav>")
}
s, err := wav.ReadSoundFile(os.Args[1])
if err != nil {
return err
}
start, err := strconv.ParseFloat(os.Args[2], 64)
if err != nil {
return err
}
end, err := strconv.ParseFloat(os.Args[3], 64)
if err != nil {
return err
}
wav.Gradient(s, time.Duration(start*float64(time.Second)),
time.Duration(end*float64(time.Second)))
return wav.WriteFile(s, os.Args[4])
}
func loadRawVoice(path string) (Voice, error) {
// Read the directory
f, err := os.Open(path)
if err != nil {
return nil, err
}
names, err := f.Readdirnames(-1)
f.Close()
if err != nil {
return nil, err
}
// Load all WAV files
res := Voice{}
for _, name := range names {
if !strings.HasSuffix(name, ".wav") {
continue
}
baseName := name[0 : len(name)-4]
sound, err := wav.ReadSoundFile(filepath.Join(path, name))
if err != nil {
return nil, err
}
res[baseName] = sound
}
// Ensure that the voice has every edge phone.
for _, phone := range AllPhones() {
name := phone.Name()
for _, entry := range []string{"-" + name, name + "-"} {
if _, ok := res[entry]; !ok {
return nil, errors.New("Missing edge phone: " + entry)
}
}
}
return res, nil
}