ntp_server: use the I/O thread

src/ntp_server.c

@@ -18,8 +18,10 @@
  */
 
 #include "ntp_server.h"
+#include "io_thread.h"
 
 #include <glib.h>
+#include <assert.h>
 #include <stddef.h>
 #include <stdint.h>
 #include <string.h>
@@ -31,7 +33,6 @@
 #include <ws2tcpip.h>
 #include <winsock.h>
 #else
-#include <sys/select.h>
 #include <sys/socket.h>
 #endif
 
@@ -75,7 +76,7 @@ fill_time_buffer(unsigned char *buffer)
 	fill_time_buffer_with_time(buffer, &current_time);
 }
 
-bool
+static bool
 ntp_server_handle(struct ntp_server *ntp)
 {
 	unsigned char buf[32];
@@ -102,25 +103,14 @@ ntp_server_handle(struct ntp_server *ntp)
 	return num_bytes == sizeof(buf);
 }
 
-bool
-ntp_server_check(struct ntp_server *ntp, struct timeval *tout)
+static gboolean
+ntp_in_event(G_GNUC_UNUSED GIOChannel *source,
+	     G_GNUC_UNUSED GIOCondition condition,
+	     gpointer data)
 {
-	fd_set rdfds;
-	int fdmax = 0;
+	struct ntp_server *ntp = data;
 
-	FD_ZERO(&rdfds);
-
-	FD_SET(ntp->fd, &rdfds);
-	fdmax = ntp->fd;
-	if (select(fdmax + 1, &rdfds,NULL, NULL, tout) <= 0)
-		return false;
-
-	if (FD_ISSET(ntp->fd, &rdfds)) {
-		if (!ntp_server_handle(ntp)) {
-			g_debug("unable to send timing response\n");
-			return false;
-		}
-	}
+	ntp_server_handle(ntp);
 	return true;
 }
 
@@ -131,9 +121,41 @@ ntp_server_init(struct ntp_server *ntp)
 	ntp->fd = -1;
 }
 
+void
+ntp_server_open(struct ntp_server *ntp, int fd)
+{
+	assert(ntp->fd < 0);
+	assert(fd >= 0);
+
+	ntp->fd = fd;
+
+#ifndef G_OS_WIN32
+	ntp->channel = g_io_channel_unix_new(fd);
+#else
+	ntp->channel = g_io_channel_win32_new_socket(fd);
+#endif
+	/* NULL encoding means the stream is binary safe */
+	g_io_channel_set_encoding(ntp->channel, NULL, NULL);
+	/* no buffering */
+	g_io_channel_set_buffered(ntp->channel, false);
+
+	ntp->source = g_io_create_watch(ntp->channel, G_IO_IN);
+	g_source_set_callback(ntp->source, (GSourceFunc)ntp_in_event, ntp,
+			      NULL);
+	g_source_attach(ntp->source, io_thread_context());
+}
+
 void
 ntp_server_close(struct ntp_server *ntp)
 {
+	if (ntp->source != NULL) {
+		g_source_destroy(ntp->source);
+		g_source_unref(ntp->source);
+	}
+
+	if (ntp->channel != NULL)
+		g_io_channel_unref(ntp->channel);
+
 	if (ntp->fd >= 0)
 		close(ntp->fd);
 }

src/ntp_server.h

@@ -20,6 +20,8 @@
 #ifndef MPD_NTP_SERVER_H
 #define MPD_NTP_SERVER_H
 
+#include <glib.h>
+
 #include <stdbool.h>
 
 struct timeval;
@@ -27,24 +29,18 @@ struct timeval;
 struct ntp_server {
 	unsigned short port;
 	int fd;
+
+	GIOChannel *channel;
+	GSource *source;
 };
 
 void
 ntp_server_init(struct ntp_server *ntp);
 
+void
+ntp_server_open(struct ntp_server *ntp, int fd);
+
 void
 ntp_server_close(struct ntp_server *ntp);
 
-/*
- * Recv the NTP datagram from the AirTunes, send back an NTP response.
- */
-bool
-ntp_server_handle(struct ntp_server *ntp);
-
-/*
- * check to see if there are any timing requests, and respond if there are any
- */
-bool
-ntp_server_check(struct ntp_server *ntp, struct timeval *tout);
-
 #endif

src/output/raop_output_plugin.c

@@ -535,15 +535,11 @@ exec_request(struct rtspcl_data *rtspcld, const char *cmd,
 	while (true) {
 		FD_ZERO(&rdfds);
 		FD_SET(rtspcld->fd, &rdfds);
-		FD_SET(raop_session->ntp.fd, &rdfds);
-		fdmax = raop_session->ntp.fd > rtspcld->fd ? raop_session->ntp.fd : rtspcld->fd;;
+		fdmax = rtspcld->fd;
 		select(fdmax + 1, &rdfds, NULL, NULL, &tout);
 		if (FD_ISSET(rtspcld->fd, &rdfds)) {
 			break;
 		}
-		if (FD_ISSET(raop_session->ntp.fd, &rdfds)) {
-			ntp_server_handle(&raop_session->ntp);
-		}
 	}
 
 	if (read_line(rtspcld->fd, line, sizeof(line), timeout, 0) <= 0) {
@@ -1068,20 +1064,14 @@ static bool
 send_audio_data(int fd, GError **error_r)
 {
 	int i = 0;
-	struct timeval current_time, tout, rtp_time;
+	struct timeval current_time, rtp_time;
 	struct raop_data *rd = raop_session->raop_list;
 
 	get_time_for_rtp(&raop_session->play_state, &rtp_time);
 	gettimeofday(&current_time, NULL);
 	int diff = difference(&current_time, &rtp_time);
+	g_usleep(-diff);
 
-	while (diff < -10000) {
-		tout.tv_sec = 0;
-		tout.tv_usec = -diff;
-		ntp_server_check(&raop_session->ntp, &tout);
-		gettimeofday(&current_time, NULL);
-		diff = difference(&current_time, &rtp_time);
-	}
 	gettimeofday(&raop_session->play_state.last_send, NULL);
 	while (rd) {
 		if (rd->started) {
@@ -1214,10 +1204,8 @@ raop_output_cancel(void *data)
 static bool
 raop_output_pause(void *data)
 {
-	struct timeval tout = {.tv_sec = 0, .tv_usec = 0};
 	struct raop_data *rd = (struct raop_data *) data;
 
-	ntp_server_check(&raop_session->ntp, &tout);
 	rd->paused = true;
 	return true;
 }
@@ -1284,17 +1272,18 @@ raop_output_open(void *data, struct audio_format *audio_format, GError **error_r
 		if (raop_session->data_fd < 0)
 			return false;
 
-		raop_session->ntp.fd =
-			open_udp_socket(NULL, &raop_session->ntp.port,
-					error_r);
-		if (raop_session->ntp.fd < 0)
+		int fd = open_udp_socket(NULL, &raop_session->ntp.port,
+					 error_r);
+		if (fd < 0)
 			return false;
 
+		ntp_server_open(&raop_session->ntp, fd);
+
 		raop_session->ctrl.fd =
 			open_udp_socket(NULL, &raop_session->ctrl.port,
 					error_r);
 		if (raop_session->ctrl.fd < 0) {
-			close(raop_session->ntp.fd);
+			ntp_server_close(&raop_session->ntp);
 			raop_session->ctrl.fd = -1;
 			g_mutex_unlock(raop_session->list_mutex);
 			return false;
@@ -1324,7 +1313,6 @@ raop_output_play(void *data, const void *chunk, size_t size,
 {
 	//raopcl_send_sample
 	struct raop_data *rd = data;
-	struct timeval tout = {.tv_sec = 0, .tv_usec = 0};
 	size_t rval = 0, orig_size = size;
 
 	rd->paused = false;
@@ -1335,8 +1323,6 @@ raop_output_play(void *data, const void *chunk, size_t size,
 
 	g_mutex_lock(raop_session->data_mutex);
 
-	ntp_server_check(&raop_session->ntp, &tout);
-
 	if (raop_session->play_state.rtptime <= NUMSAMPLES) {
 		// looped over, need new reference point to calculate correct times
 		raop_session->play_state.playing = false;