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

@@ -0,0 +1,52 @@
+// ABOUTME: PCM audio encoder
+// ABOUTME: Encodes int32 samples to 16-bit or 24-bit PCM bytes
+package encode
+
+import (
+	"encoding/binary"
+	"fmt"
+
+	"github.com/Sendspin/sendspin-go/pkg/audio"
+)
+
+type PCMEncoder struct {
+	bitDepth int
+}
+
+func NewPCM(format audio.Format) (Encoder, error) {
+	if format.Codec != "pcm" {
+		return nil, fmt.Errorf("invalid codec for PCM encoder: %s", format.Codec)
+	}
+
+	if format.BitDepth != 16 && format.BitDepth != 24 {
+		return nil, fmt.Errorf("unsupported bit depth: %d (supported: 16, 24)", format.BitDepth)
+	}
+
+	return &PCMEncoder{
+		bitDepth: format.BitDepth,
+	}, nil
+}
+
+func (e *PCMEncoder) Encode(samples []int32) ([]byte, error) {
+	if e.bitDepth == 24 {
+		output := make([]byte, len(samples)*3)
+		for i, sample := range samples {
+			bytes := audio.SampleTo24Bit(sample)
+			output[i*3] = bytes[0]
+			output[i*3+1] = bytes[1]
+			output[i*3+2] = bytes[2]
+		}
+		return output, nil
+	} else {
+		output := make([]byte, len(samples)*2)
+		for i, sample := range samples {
+			sample16 := audio.SampleToInt16(sample)
+			binary.LittleEndian.PutUint16(output[i*2:], uint16(sample16))
+		}
+		return output, nil
+	}
+}
+
+func (e *PCMEncoder) Close() error {
+	return nil
+}