mirror of
https://github.com/JetSetIlly/Gopher2600.git
synced 2024-05-20 13:48:02 -04:00
3aa5885ebe
curated package predated the standard errors package introduced in go1.13 the standard package does a better job of what curated attempted to do the change of package also gave me a opportunity to clean up the error messages a little bit
101 lines
2.6 KiB
Go
101 lines
2.6 KiB
Go
// This file is part of Gopher2600.
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//
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// Gopher2600 is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Gopher2600 is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Gopher2600. If not, see <https://www.gnu.org/licenses/>.
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// Package wavwriter allows writing of audio data to disk as a WAV file.
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package wavwriter
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import (
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"fmt"
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"os"
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"github.com/jetsetilly/gopher2600/hardware/television/signal"
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tia "github.com/jetsetilly/gopher2600/hardware/tia/audio"
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"github.com/jetsetilly/gopher2600/hardware/tia/audio/mix"
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"github.com/go-audio/audio"
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"github.com/go-audio/wav"
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)
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// WavWriter implements the television.AudioMixer interface
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type WavWriter struct {
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filename string
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buffer []int16
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}
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// New is the preferred method of initialisation for the WavWriter type
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func NewWavWriter(filename string) (*WavWriter, error) {
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aw := &WavWriter{
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filename: fmt.Sprintf("%s.wav", filename),
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buffer: make([]int16, 0, 0),
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}
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return aw, nil
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}
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// SetAudio implements the television.AudioMixer interface.
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func (aw *WavWriter) SetAudio(sig []signal.SignalAttributes) error {
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for _, s := range sig {
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if s&signal.AudioUpdate != signal.AudioUpdate {
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continue
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}
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v0 := uint8((s & signal.AudioChannel0) >> signal.AudioChannel0Shift)
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v1 := uint8((s & signal.AudioChannel1) >> signal.AudioChannel1Shift)
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m := mix.Mono(v0, v1)
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aw.buffer = append(aw.buffer, m)
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}
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return nil
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}
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const numChannels = 1
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const bitDepth = 16
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// EndMixing implements the television.AudioMixer interface
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func (aw *WavWriter) EndMixing() error {
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f, err := os.Create(aw.filename)
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if err != nil {
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return fmt.Errorf("wavwriter: %w", err)
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}
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defer f.Close()
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enc := wav.NewEncoder(f, tia.SampleFreq, bitDepth, numChannels, 1)
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if enc == nil {
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return fmt.Errorf("wavwriter: bad parameters for wav encoding")
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}
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defer enc.Close()
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buf := audio.PCMBuffer{
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Format: &audio.Format{
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NumChannels: numChannels,
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SampleRate: tia.SampleFreq,
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},
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I16: aw.buffer,
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DataType: audio.DataTypeI16,
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SourceBitDepth: bitDepth,
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}
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err = enc.Write(buf.AsIntBuffer())
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if err != nil {
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return fmt.Errorf("wavwriter: %w", err)
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}
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return nil
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}
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// Reset implements the television.AudioMixer interface
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func (aw *WavWriter) Reset() {
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}
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