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third_party/sendspin-go/internal/server/test_tone_source.go

@@ -0,0 +1,50 @@
+// ABOUTME: Test tone generator for audio source
+// ABOUTME: Generates 440Hz sine wave for testing
+package server
+
+import (
+	"math"
+	"sync"
+)
+
+type TestToneSource struct {
+	sampleIndex uint64
+	sampleMu    sync.Mutex
+	frequency   float64
+}
+
+func NewTestToneSource() *TestToneSource {
+	return &TestToneSource{
+		frequency: 440.0, // A4 note
+	}
+}
+
+func (s *TestToneSource) Read(samples []int32) (int, error) {
+	s.sampleMu.Lock()
+	defer s.sampleMu.Unlock()
+
+	numSamples := len(samples) / 2 // Stereo
+
+	for i := 0; i < numSamples; i++ {
+		t := float64(s.sampleIndex+uint64(i)) / float64(DefaultSampleRate)
+		sample := math.Sin(2 * math.Pi * s.frequency * t)
+
+		// 50% amplitude to avoid clipping on a full-scale sine
+		const max24bit = 8388607 // 2^23 - 1
+		pcmValue := int32(sample * max24bit * 0.5)
+
+		samples[i*2] = pcmValue
+		samples[i*2+1] = pcmValue
+	}
+
+	s.sampleIndex += uint64(numSamples)
+
+	return len(samples), nil
+}
+
+func (s *TestToneSource) SampleRate() int { return DefaultSampleRate }
+func (s *TestToneSource) Channels() int   { return DefaultChannels }
+func (s *TestToneSource) Metadata() (string, string, string) {
+	return "Test Tone", "Sendspin Server", "Reference Implementation"
+}
+func (s *TestToneSource) Close() error { return nil }