LibAudio: Allow generating sine waves

2026-08-24 01:44:04 +03:00
parent 2e22ebf0b5
commit c6a435ed36
5 changed files with 79 additions and 15 deletions
@@ -0,0 +1,36 @@
+#include <LibAudio/AudioStreams/SineWaveAudioStream.h>
+
+#include <BAN/Math.h>
+
+namespace LibAudio
+{
+
+	BAN::ErrorOr<BAN::UniqPtr<AudioStream>> SineWaveAudioStream::create(uint32_t channels, uint32_t sample_rate, float frequency)
+	{
+		auto* stream_ptr = new SineWaveAudioStream(channels, sample_rate, frequency);
+		if (stream_ptr == nullptr)
+			return BAN::Error::from_errno(ENOMEM);
+		return BAN::UniqPtr<AudioStream>::adopt(stream_ptr);
+	}
+
+	SineWaveAudioStream::SineWaveAudioStream(uint32_t channels, uint32_t sample_rate, float frequency)
+		: m_channels(channels)
+		, m_sample_rate(sample_rate)
+		, m_frequency(frequency)
+		, m_phase_inc(2.0f * BAN::numbers::pi_v<float> * m_frequency / m_sample_rate)
+	{ }
+
+	float SineWaveAudioStream::get_sample()
+	{
+		if (m_sample_idx++ % m_channels == 0)
+		{
+			m_phase += m_phase_inc;
+			if (m_phase >= 2.0f * BAN::numbers::pi_v<float>)
+				m_phase -= 2.0f * BAN::numbers::pi_v<float>;
+			m_sample = BAN::Math::sin(m_phase);
+		}
+
+		return m_sample;
+	}
+
+}