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third_party/sendspin-go/pkg/audio/decode/pcm.go

@@ -0,0 +1,52 @@
+// ABOUTME: PCM audio decoder
+// ABOUTME: Decodes 16-bit and 24-bit PCM audio to int32 samples
+package decode
+
+import (
+	"encoding/binary"
+	"fmt"
+
+	"github.com/Sendspin/sendspin-go/pkg/audio"
+)
+
+type PCMDecoder struct {
+	bitDepth int
+}
+
+func NewPCM(format audio.Format) (Decoder, error) {
+	if format.Codec != "pcm" {
+		return nil, fmt.Errorf("invalid codec for PCM decoder: %s", format.Codec)
+	}
+
+	if format.BitDepth != 16 && format.BitDepth != 24 {
+		return nil, fmt.Errorf("unsupported bit depth: %d (supported: 16, 24)", format.BitDepth)
+	}
+
+	return &PCMDecoder{
+		bitDepth: format.BitDepth,
+	}, nil
+}
+
+func (d *PCMDecoder) Decode(data []byte) ([]int32, error) {
+	if d.bitDepth == 24 {
+		numSamples := len(data) / 3
+		samples := make([]int32, numSamples)
+		for i := 0; i < numSamples; i++ {
+			b := [3]byte{data[i*3], data[i*3+1], data[i*3+2]}
+			samples[i] = audio.SampleFrom24Bit(b)
+		}
+		return samples, nil
+	} else {
+		numSamples := len(data) / 2
+		samples := make([]int32, numSamples)
+		for i := 0; i < numSamples; i++ {
+			sample16 := int16(binary.LittleEndian.Uint16(data[i*2:]))
+			samples[i] = audio.SampleFromInt16(sample16)
+		}
+		return samples, nil
+	}
+}
+
+func (d *PCMDecoder) Close() error {
+	return nil
+}