Userspace: Add simple AudioServer and LibAudio

userspace/programs/AudioServer/AudioServer.h

@@ -0,0 +1,48 @@
+#pragma once
+
+#include <BAN/Array.h>
+#include <BAN/ByteSpan.h>
+#include <BAN/CircularQueue.h>
+#include <BAN/HashMap.h>
+
+#include <LibAudio/Audio.h>
+
+class AudioServer
+{
+	BAN_NON_MOVABLE(AudioServer);
+	BAN_NON_COPYABLE(AudioServer);
+
+public:
+	AudioServer(int audio_device_fd);
+
+	BAN::ErrorOr<void> on_new_client(int fd);
+	void on_client_disconnect(int fd);
+	bool on_client_packet(int fd, long smo_key);
+
+	void update();
+
+private:
+	struct ClientInfo
+	{
+		LibAudio::AudioBuffer* buffer;
+		size_t sample_frames_queued { 0 };
+	};
+
+private:
+	enum class AddOrRemove { Add, Remove };
+
+	void reset_kernel_buffer();
+
+	void send_samples();
+
+private:
+	const int m_audio_device_fd;
+	uint32_t m_sample_rate;
+	uint32_t m_channels;
+
+	size_t m_samples_sent { 0 };
+	BAN::Array<uint8_t, 1024> m_send_buffer;
+	BAN::CircularQueue<double, 64 * 1024> m_samples;
+
+	BAN::HashMap<int, ClientInfo> m_audio_buffers;
+};