package audio
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import "testing"
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func TestReadSamplesSinceReturnsOnlyNewSamples(t *testing.T) {
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r := &Recorder{
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pcmBuf: pcm16LE(0, 16384, -32768),
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}
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samples, nextOffset := r.ReadSamplesSince(1)
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if nextOffset != 3 {
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t.Fatalf("next offset = %d, want 3", nextOffset)
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}
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if len(samples) != 2 {
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t.Fatalf("sample count = %d, want 2", len(samples))
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}
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if samples[0] != 0.5 {
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t.Fatalf("samples[0] = %f, want 0.5", samples[0])
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}
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if samples[1] != -1 {
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t.Fatalf("samples[1] = %f, want -1", samples[1])
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}
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}
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func TestReadSamplesSinceClampsOffset(t *testing.T) {
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r := &Recorder{
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pcmBuf: pcm16LE(0, 16384),
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}
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samples, nextOffset := r.ReadSamplesSince(99)
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if nextOffset != 2 {
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t.Fatalf("next offset = %d, want 2", nextOffset)
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}
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if len(samples) != 0 {
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t.Fatalf("sample count = %d, want 0", len(samples))
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}
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}
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func pcm16LE(values ...int16) []byte {
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buf := make([]byte, len(values)*2)
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for i, value := range values {
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buf[i*2] = byte(value)
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buf[i*2+1] = byte(value >> 8)
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}
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return buf
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}
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