31 lines
805 B
Go
31 lines
805 B
Go
package opus
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import "fmt"
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// Decoder decodes the Opus bitstream into PCM
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type Decoder struct {
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}
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// Decode decodes the Opus bitstream into PCM
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func (d *Decoder) Decode(in []byte) (bandwidth Bandwidth, isStereo bool, frames [][]byte, err error) {
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if len(in) < 1 {
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return 0, false, nil, errTooShortForTableOfContentsHeader
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}
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tocHeader := tableOfContentsHeader(in[0])
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cfg := tocHeader.configuration()
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switch tocHeader.frameCode() {
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case frameCodeOneFrame:
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frames = append(frames, in[1:])
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default:
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return 0, false, nil, fmt.Errorf("%w: %d", errUnsupportedFrameCode, tocHeader.frameCode())
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}
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if cfg.mode() != configurationModeCELTOnly {
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return 0, false, nil, fmt.Errorf("%w: %d", errUnsupportedConfigurationMode, cfg.mode())
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}
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return cfg.bandwidth(), tocHeader.isStereo(), nil, nil
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}
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