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noise.go
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noise.go
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// Copyright 2021 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package noise
import (
"bytes"
"fmt"
"io"
"github.com/hajimehoshi/ebiten/v2/audio"
"github.com/hajimehoshi/ebiten/v2/audio/vorbis"
"github.com/divVerent/aaaaxy/internal/audiowrap"
"github.com/divVerent/aaaaxy/internal/flag"
"github.com/divVerent/aaaaxy/internal/vfs"
)
var (
noiseVolume = flag.Float64("noise_volume", 0.5, "noise volume (0..1)")
)
const (
shrinkagePerFrame = 0.05
)
var (
amount float64 = 0.0
noise *audiowrap.Player
)
func Init() error {
data, err := vfs.Load("sounds", "stereonoise.ogg")
if err != nil {
return fmt.Errorf("could not load stereonoise: %w", err)
}
defer data.Close()
stream, err := vorbis.DecodeWithSampleRate(audiowrap.SampleRate(), data)
if err != nil {
return fmt.Errorf("could not start decoding stereonosie: %w", err)
}
decoded, err := io.ReadAll(stream)
if err != nil {
return fmt.Errorf("could not decode stereonoise: %w", err)
}
noise, err = audiowrap.NewPlayer(func() (io.ReadCloser, error) {
return io.NopCloser(audio.NewInfiniteLoop(bytes.NewReader(decoded), int64(len(decoded)))), nil
})
if err != nil {
return fmt.Errorf("could not start playing noise: %w", err)
}
return nil
}
func Update() {
if amount > 0 {
noise.SetVolume(amount * *noiseVolume)
noise.Play()
} else {
noise.Pause()
}
amount -= shrinkagePerFrame
}
func Set(noise float64) {
if noise > 1 {
noise = 1
}
if noise > amount {
amount = noise
}
}