output/raop: new output plugin

Remote Audio Output Protocol (RAOP), for Apple devices.

1 files changed, 159 insertions, 0 deletions

diff --git a/src/output/raop_output_plugin.h b/src/output/raop_output_plugin.h
new file mode 100644
index 000000000..6672cf8a0
--- /dev/null
+++ b/src/output/raop_output_plugin.h
@@ -0,0 +1,159 @@
+/*
+ * Copyright (C) 2003-2010 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_OUTPUT_RAOP_PLUGIN_H
+#define MPD_OUTPUT_RAOP_PLUGIN_H
+
+#include <pthread.h>
+#include <stdbool.h>
+#include <netinet/in.h>
+#include <sys/time.h>
+#include <openssl/aes.h>
+
+struct key_data {
+	unsigned char *key;
+	unsigned char *data;
+	struct key_data *next;
+};
+
+struct play_state {
+	bool playing;
+	unsigned short seq_num;
+	unsigned int rtptime;
+	unsigned int sync_src;
+	unsigned int start_rtptime;
+	struct timeval start_time;
+	struct timeval last_send;
+};
+
+/*********************************************************************/
+
+struct rtspcl_data {
+	int fd;
+	char url[128];
+	int cseq;
+	struct key_data *kd;
+	struct key_data *exthds;
+	char *session;
+	char *transport;
+	unsigned short server_port;
+	unsigned short control_port;
+	struct in_addr host_addr;
+	struct in_addr local_addr;
+	const char *useragent;
+
+};
+
+enum pause_state {
+	NO_PAUSE = 0,
+	OP_PAUSE,
+	NODATA_PAUSE,
+};
+
+#define MINIMUM_SAMPLE_SIZE 32
+
+#define RAOP_FD_READ (1<<0)
+#define RAOP_FD_WRITE (1<<1)
+
+/*********************************************************************/
+
+struct encrypt_data {
+	AES_KEY ctx;
+	unsigned char iv[16]; // initialization vector for aes-cbc
+	unsigned char nv[16]; // next vector for aes-cbc
+	unsigned char key[16]; // key for aes-cbc
+};
+
+/*********************************************************************/
+
+struct ntp_data {
+	unsigned short port;
+	int fd;
+};
+
+/*********************************************************************/
+
+struct raop_data {
+	struct rtspcl_data *rtspcl;
+	const char *addr; // target host address
+	short rtsp_port;
+	struct sockaddr_in ctrl_addr;
+	struct sockaddr_in data_addr;
+
+	bool is_master;
+	struct raop_data *next;
+
+	unsigned volume;
+
+	pthread_mutex_t control_mutex;
+
+	bool started;
+	bool paused;
+};
+
+/*********************************************************************/
+
+struct control_data {
+	unsigned short port;
+	int fd;
+};
+
+bool
+send_control_command(struct control_data *ctrl, struct raop_data *rd, struct play_state *state);
+
+/*********************************************************************/
+
+#define NUMSAMPLES 352
+#define RAOP_BUFFER_SIZE NUMSAMPLES * 4
+#define RAOP_HEADER_SIZE 12
+#define ALAC_MAX_HEADER_SIZE 8
+#define RAOP_MAX_PACKET_SIZE RAOP_BUFFER_SIZE + RAOP_HEADER_SIZE + ALAC_MAX_HEADER_SIZE
+
+// session
+struct raop_session_data {
+	struct raop_data *raop_list;
+	struct ntp_data ntp;
+	struct control_data ctrl;
+	struct encrypt_data encrypt;
+	struct play_state play_state;
+
+	int data_fd;
+
+	unsigned char buffer[RAOP_BUFFER_SIZE];
+	size_t bufferSize;
+
+	unsigned char data[RAOP_MAX_PACKET_SIZE];
+	int wblk_wsize;
+	int wblk_remsize;
+
+	pthread_mutex_t data_mutex;
+	pthread_mutex_t list_mutex;
+};
+
+//static struct raop_session_data *raop_session;
+
+/*********************************************************************/
+
+bool
+raop_set_volume(struct raop_data *rd, unsigned volume);
+
+int
+raop_get_volume(struct raop_data *rd);
+
+#endif