LibAudio: Allow generating sine waves

userspace/libraries/LibAudio/include/LibAudio/Audio.h

@@ -30,8 +30,8 @@ namespace LibAudio
 
 	public:
 		static BAN::ErrorOr<Audio> create(uint32_t channels, uint32_t sample_rate, uint32_t sample_frames);
+		static BAN::ErrorOr<Audio> create(BAN::UniqPtr<AudioStream>&&);
 		static BAN::ErrorOr<Audio> load(BAN::StringView path);
-		static BAN::ErrorOr<Audio> random(uint32_t samples);
 		~Audio() { clear(); }
 
 		Audio(Audio&& other) { *this = BAN::move(other); }

userspace/libraries/LibAudio/include/LibAudio/AudioStreams/SineWaveAudioStream.h

@@ -0,0 +1,35 @@
+#pragma once
+
+#include <LibAudio/AudioStream.h>
+
+#include <BAN/Limits.h>
+
+namespace LibAudio
+{
+
+	class SineWaveAudioStream : public AudioStream
+	{
+	public:
+		static BAN::ErrorOr<BAN::UniqPtr<AudioStream>> create(uint32_t channels, uint32_t sample_rate, float frequency);
+
+		uint32_t channels() const override { return m_channels; }
+		uint32_t sample_rate() const override { return m_sample_rate; }
+		uint32_t samples_remaining() const override { return BAN::numeric_limits<uint32_t>::max(); }
+
+		float get_sample() override;
+
+	private:
+		SineWaveAudioStream(uint32_t channels, uint32_t sample_rate, float frequency);
+
+	private:
+		const uint32_t m_channels;
+		const uint32_t m_sample_rate;
+		const float    m_frequency;
+		const float    m_phase_inc;
+
+		uint32_t m_sample_idx { 0 };
+		float    m_sample     { 0 };
+		float    m_phase      { 0 };
+	};
+
+}