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43 lines
1.1 KiB
Go
43 lines
1.1 KiB
Go
package transcode
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import (
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"context"
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"github.com/gopxl/beep"
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"github.com/gopxl/beep/effects"
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)
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func buildPipeline(streamer beep.Streamer, format beep.Format, opt Options) (beep.Streamer, beep.Format) {
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out := streamer
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if opt.SampleRate > 0 && format.SampleRate != beep.SampleRate(opt.SampleRate) {
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out = beep.Resample(4, format.SampleRate, beep.SampleRate(opt.SampleRate), out)
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format.SampleRate = beep.SampleRate(opt.SampleRate)
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}
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if opt.Channels == 1 {
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out = effects.Mono(out)
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format.NumChannels = 1
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}
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return out, format
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}
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func drainSamples(ctx context.Context, s beep.Streamer) ([]float64, error) {
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buf := make([][2]float64, 4096)
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var samples []float64
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for {
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if err := ctx.Err(); err != nil {
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return nil, err
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}
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n, ok := s.Stream(buf)
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if !ok {
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if err := s.Err(); err != nil {
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return nil, err
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}
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break
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}
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for i := 0; i < n; i++ {
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samples = append(samples, buf[i][0])
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}
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}
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return samples, nil
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}
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