typedef struct Audio Audio;
struct Audio {
	int fd;
	Channel *in;
	Channel *out;

	int inpid;
	int outpid;
};

typedef struct Block Block;
struct Block {
	ulong length;
	uchar *data;
};

enum {
	CLIENT_CONNECTING	= 0,
	CLIENT_WAITING		= 1,
	CLIENT_CONNECTED	= 2,
};

typedef struct Client Client;
struct Client {
	int state;

	uchar me[IPaddrlen];

	uchar them[IPaddrlen];
	ushort themport;

	int udpctl;
	int udpdata;

	Channel *pkt;

	vlong pingsent;
	vlong latency;
	vlong lastreply;

	u64int seqin, seqout;

	uvlong recvpkts;
	uvlong lostpkts;
	uvlong bytesin;
	uvlong bytesout;
};

enum {
	PKT_INVALID	= 0ULL,
	PKT_PING	= 1ULL,
	PKT_PONG	= 2ULL,
	PKT_AUDIO	= 3ULL,
};