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params.go
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params.go
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package square
import (
"time"
"github.com/heucuva/go-qwertysynth/internal/standards/metric"
equalTuning "github.com/heucuva/go-qwertysynth/internal/standards/tuning/equal"
"github.com/heucuva/go-qwertysynth/internal/synth/wave"
"github.com/pkg/errors"
)
type settings struct {
amp float32
phase metric.Radians
frequency, sampleRate float64
duration time.Duration
}
func (s *settings) SetParameterByName(name string, value any) error {
switch name {
case "amplitude", "amp", "a":
if amp, ok := value.(float32); !ok {
return errors.Wrap(wave.ErrInvalidParameterValue, name)
} else {
s.amp = amp
}
case "phase":
if phase, ok := value.(metric.Radians); !ok {
return errors.Wrap(wave.ErrInvalidParameterValue, name)
} else {
s.phase = phase
}
case "frequency", "freq", "f":
if freq, ok := value.(float64); !ok {
return errors.Wrap(wave.ErrInvalidParameterValue, name)
} else {
s.frequency = freq
}
case "sampleRate":
if sampleRate, ok := value.(float64); !ok {
return errors.Wrap(wave.ErrInvalidParameterValue, name)
} else {
s.sampleRate = sampleRate
}
case "duration":
if duration, ok := value.(time.Duration); !ok {
return errors.Wrap(wave.ErrInvalidParameterValue, name)
} else {
s.duration = duration
}
default:
return errors.Wrap(wave.ErrNotValidForThisGenerator, name)
}
return nil
}
const (
defaultAmp = 1.0
defaultPhase metric.Radians = 0.0
defaultFrequency = equalTuning.A440_A4Frequency
defaultSampleRate = 48000
defaultDuration time.Duration = 0
)
func squareParam(fn func(gen *settings) error) wave.GeneratorParam {
return func(o interface{}) error {
gen, ok := o.(*settings)
if !ok {
return wave.ErrNotValidForThisGenerator
}
return fn(gen)
}
}
func Amplitude(amp float32) wave.GeneratorParam {
return squareParam(func(gen *settings) error {
gen.amp = amp
return nil
})
}
func Frequency(freq float64) wave.GeneratorParam {
return squareParam(func(gen *settings) error {
gen.frequency = freq
return nil
})
}
func Phase(phase metric.Radians) wave.GeneratorParam {
return squareParam(func(gen *settings) error {
gen.phase = phase
return nil
})
}
func SampleRate(sampleRate float64) wave.GeneratorParam {
return squareParam(func(gen *settings) error {
gen.sampleRate = sampleRate
return nil
})
}
func Duration(duration time.Duration) wave.GeneratorParam {
return squareParam(func(gen *settings) error {
gen.duration = duration
return nil
})
}