output/raop: move NTP code to separate library

Makefile.am

@@ -773,7 +773,9 @@ OUTPUT_SRC += src/output/osx_plugin.c
 endif
 
 if ENABLE_RAOP_OUTPUT
-OUTPUT_SRC += src/output/raop_output_plugin.c
+OUTPUT_SRC += \
+	src/ntp_server.c src/ntp_server.h \
+	src/output/raop_output_plugin.c
 MIXER_SRC += src/mixer/raop_mixer_plugin.c
 endif
 

src/ntp_server.c

+/*
+ * Copyright (C) 2003-2011 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "ntp_server.h"
+
+#include <glib.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/time.h>
+
+#ifdef WIN32
+#define WINVER 0x0501
+#include <ws2tcpip.h>
+#include <winsock.h>
+#else
+#include <sys/select.h>
+#include <sys/socket.h>
+#endif
+
+/*
+ * Calculate the current NTP time, store it in the buffer.
+ */
+static void
+fill_int(unsigned char *buffer, uint32_t value)
+{
+	uint32_t be = GINT32_TO_BE(value);
+	memcpy(buffer, &be, sizeof(be));
+}
+
+/*
+ * Store time in the NTP format in the buffer
+ */
+static void
+fill_time_buffer_with_time(unsigned char *buffer, struct timeval *tout)
+{
+	unsigned long secs_to_baseline = 964697997;
+	double fraction;
+	unsigned long long_fraction;
+	unsigned long secs;
+
+	fraction = ((double) tout->tv_usec) / 1000000.0;
+	long_fraction = (unsigned long) (fraction * 256.0 * 256.0 * 256.0 * 256.0);
+	secs = secs_to_baseline + tout->tv_sec;
+	fill_int(buffer, secs);
+	fill_int(buffer + 4, long_fraction);
+}
+
+/*
+ * Calculate the current NTP time, store it in the buffer.
+ */
+static void
+fill_time_buffer(unsigned char *buffer)
+{
+	struct timeval current_time;
+
+	gettimeofday(&current_time,NULL);
+	fill_time_buffer_with_time(buffer, &current_time);
+}
+
+bool
+ntp_server_handle(struct ntp_server *ntp)
+{
+	unsigned char buf[32];
+	struct sockaddr addr;
+	int iter;
+	unsigned int addr_len = sizeof(addr);
+	int num_bytes = recvfrom(ntp->fd, buf, sizeof(buf), 0, &addr, &addr_len);
+	if (num_bytes == 0) {
+		return false;
+	}
+	fill_time_buffer(buf + 16);
+	// set to response
+	buf[1] = 0xd3;
+	// copy request
+	for (iter = 0; iter < 8; iter++) {
+		buf[8 + iter] = buf[24 + iter];
+	}
+	fill_time_buffer(buf + 24);
+
+	num_bytes = sendto(ntp->fd, buf, num_bytes, 0, &addr, addr_len);
+
+	return num_bytes == sizeof(buf);
+}
+
+bool
+ntp_server_check(struct ntp_server *ntp, struct timeval *tout)
+{
+	fd_set rdfds;
+	int fdmax = 0;
+
+	FD_ZERO(&rdfds);
+
+	FD_SET(ntp->fd, &rdfds);
+	fdmax = ntp->fd;
+	select(fdmax + 1, &rdfds,NULL, NULL, tout);
+	if (FD_ISSET(ntp->fd, &rdfds)) {
+		if (!ntp_server_handle(ntp)) {
+			g_debug("unable to send timing response\n");
+			return false;
+		}
+	}
+	return true;
+}
+
+void
+ntp_server_init(struct ntp_server *ntp)
+{
+	ntp->port = 6002;
+	ntp->fd = -1;
+}
+
+void
+ntp_server_close(struct ntp_server *ntp)
+{
+	if (ntp->fd >= 0)
+		close(ntp->fd);
+}

src/ntp_server.h

+/*
+ * Copyright (C) 2003-2011 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef MPD_NTP_SERVER_H
+#define MPD_NTP_SERVER_H
+
+#include <stdbool.h>
+
+struct timeval;
+
+struct ntp_server {
+	unsigned short port;
+	int fd;
+};
+
+void
+ntp_server_init(struct ntp_server *ntp);
+
+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

@@ -67,8 +67,7 @@ new_raop_data(GError **error_r)
 	if (raop_session == NULL) {
 		raop_session = g_new(struct raop_session_data, 1);
 		raop_session->raop_list = NULL;
-		raop_session->ntp.port = 6002;
-		raop_session->ntp.fd = -1;
+		ntp_server_init(&raop_session->ntp);
 		raop_session->ctrl.port = 6001;
 		raop_session->ctrl.fd = -1;
 		raop_session->play_state.playing = false;
@@ -402,46 +401,6 @@ fill_time_buffer_with_time(unsigned char *buffer, struct timeval *tout)
 	fill_int(buffer + 4, long_fraction);
 }
 
-/*
- * Calculate the current NTP time, store it in the buffer.
- */
-static void
-fill_time_buffer(unsigned char *buffer)
-{
-	struct timeval current_time;
-
-	gettimeofday(&current_time,NULL);
-	fill_time_buffer_with_time(buffer, &current_time);
-}
-
-/*
- * Recv the NTP datagram from the AirTunes, send back an NTP response.
- */
-static bool
-send_timing_response(int fd)
-{
-	unsigned char buf[32];
-	struct sockaddr addr;
-	int iter;
-	unsigned int addr_len = sizeof(addr);
-	int num_bytes = recvfrom(fd, buf, sizeof(buf), 0, &addr, &addr_len);
-	if (num_bytes == 0) {
-		return false;
-	}
-	fill_time_buffer(buf + 16);
-	// set to response
-	buf[1] = 0xd3;
-	// copy request
-	for (iter = 0; iter < 8; iter++) {
-		buf[8 + iter] = buf[24 + iter];
-	}
-	fill_time_buffer(buf + 24);
-
-	num_bytes = sendto(fd, buf, num_bytes, 0, &addr, addr_len);
-
-	return num_bytes == sizeof(buf);
-}
-
 static void
 get_time_for_rtp(struct play_state *state, struct timeval *tout)
 {
@@ -498,29 +457,6 @@ send_control_command(struct control_data *ctrl, struct raop_data *rd,
 }
 
 /*
- * check to see if there are any timing requests, and respond if there are any
- */
-static bool
-check_timing(struct timeval *tout)
-{
-	fd_set rdfds;
-	int fdmax = 0;
-
-	FD_ZERO(&rdfds);
-
-	FD_SET(raop_session->ntp.fd, &rdfds);
-	fdmax = raop_session->ntp.fd;
-	select(fdmax + 1, &rdfds,NULL, NULL, tout);
-	if (FD_ISSET(raop_session->ntp.fd, &rdfds)) {
-		if (!send_timing_response(raop_session->ntp.fd)) {
-			g_debug("unable to send timing response\n");
-			return false;
-		}
-	}
-	return true;
-}
-
-/*
  * send RTSP request, and get response if it's needed
  * if this gets a success, *kd is allocated or reallocated (if *kd is not NULL)
  */
@@ -605,7 +541,7 @@ exec_request(struct rtspcl_data *rtspcld, const char *cmd,
 			break;
 		}
 		if (FD_ISSET(raop_session->ntp.fd, &rdfds)) {
-			send_timing_response(raop_session->ntp.fd);
+			ntp_server_handle(&raop_session->ntp);
 		}
 	}
 
@@ -1141,7 +1077,7 @@ send_audio_data(int fd, GError **error_r)
 	while (diff < -10000) {
 		tout.tv_sec = 0;
 		tout.tv_usec = -diff;
-		check_timing(&tout);
+		ntp_server_check(&raop_session->ntp, &tout);
 		gettimeofday(&current_time, NULL);
 		diff = difference(&current_time, &rtp_time);
 	}
@@ -1280,7 +1216,7 @@ raop_output_pause(void *data)
 	struct timeval tout = {.tv_sec = 0, .tv_usec = 0};
 	struct raop_data *rd = (struct raop_data *) data;
 
-	check_timing(&tout);
+	ntp_server_check(&raop_session->ntp, &tout);
 	rd->paused = true;
 	return true;
 }
@@ -1304,7 +1240,7 @@ raop_output_close(void *data)
 					// TODO clean up everything else
 					raop_session->play_state.playing = false;
 					close(raop_session->data_fd);
-					close(raop_session->ntp.fd);
+					ntp_server_close(&raop_session->ntp);
 					close(raop_session->ctrl.fd);
 				}
 			}
@@ -1398,7 +1334,7 @@ raop_output_play(void *data, const void *chunk, size_t size,
 
 	g_mutex_lock(raop_session->data_mutex);
 
-	check_timing(&tout);
+	ntp_server_check(&raop_session->ntp, &tout);
 
 	if (raop_session->play_state.rtptime <= NUMSAMPLES) {
 		// looped over, need new reference point to calculate correct times

src/output/raop_output_plugin.h

@@ -20,6 +20,8 @@
 #ifndef MPD_OUTPUT_RAOP_PLUGIN_H
 #define MPD_OUTPUT_RAOP_PLUGIN_H
 
+#include "ntp_server.h"
+
 #include <glib.h>
 #include <stdbool.h>
 #include <sys/time.h>
@@ -89,13 +91,6 @@ struct encrypt_data {
 
 /*********************************************************************/
 
-struct ntp_data {
-	unsigned short port;
-	int fd;
-};
-
-/*********************************************************************/
-
 struct raop_data {
 	struct rtspcl_data *rtspcl;
 	const char *addr; // target host address
@@ -132,7 +127,7 @@ struct control_data {
 // session
 struct raop_session_data {
 	struct raop_data *raop_list;
-	struct ntp_data ntp;
+	struct ntp_server ntp;
 	struct control_data ctrl;
 	struct encrypt_data encrypt;
 	struct play_state play_state;