/*
- * Copyright (C) 2005-2008 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2005-2012 Andre Noll <maan@systemlinux.org>
*
* Licensed under the GPL v2. For licencing details see COPYING.
*/
/**
* Describes one supported sender of para_server.
*
- * \sa http_send.c ortp_send.c, dccp_send.c.
+ * \sa http_send.c udp_send.c, dccp_send.c.
*/
struct sender {
/** The name of the sender. */
* only differ if the stream was repositioned by the \a ff or \a jmp
* command. Of course, \a buf is a pointer to the chunk of data which
* should be sent, and \a len is the length of this buffer.
- */
+ */
void (*send)(long unsigned current_chunk, long unsigned chunks_sent,
- const char *buf, size_t len);
+ const char *buf, size_t len, const char *header_buf,
+ size_t header_len);
/**
* Add file descriptors to fd_sets.
*
* pointer means this command is not implemented by this sender.
*/
int (*client_cmds[NUM_SENDER_CMDS])(struct sender_command_data*);
+ /**
+ * Resolve target-specific URL string
+ *
+ * This method must be defined if the sender supports the add/delete
+ * subcommands. It interprets a string specifying a target URL in a
+ * sender-specific fashion (e.g. embedded FEC string). It can also
+ * fill in sender-specific defaults if necessary.
+ */
+ int (*resolve_target)(const char *, struct sender_command_data *);
};
/** Describes one client, connected to a paraslash sender. */
void *private_data;
};
+/**
+ * Each paraslash sender may register arbitrary many clients to the virtual
+ * streaming system, possibly with varying fec parameters. In order to do so,
+ * it must allocate a \a fec_client_parms structure and pass it to \ref
+ * vss_add_fec_client.
+ *
+ * Clients are automatically removed from that list by the vss if an error
+ * occurs, or if the sender requests deletion of a client by calling \ref
+ * vss_del_fec_client().
+ */
+
+/** FEC parameters requested by FEC clients. */
+struct fec_client_parms {
+ /** Number of data slices plus redundant slices. */
+ uint8_t slices_per_group;
+ /** Number of slices minus number of redundant slices. */
+ uint8_t data_slices_per_group;
+ /** Whether the header must be sent periodically. */
+ bool need_periodic_header;
+ /**
+ * Transport-layer initialisation for FEC support.
+ *
+ * This optional function serves (a) to make the transport layer
+ * ready to send FEC slices and (b) to determine the Maximum
+ * Packet Size (MPS) supported by the connection. The MPS value
+ * determines the largest payload size. This value is used to
+ * send FEC slices that are not larger than the path MTU, to avoid
+ * fragmentation and to maximize packet utilization. The user can
+ * alternatively specify a slice size of up to this value.
+ */
+ int (*init_fec)(struct sender_client *sc);
+ /** Push out FEC-encoded packets */
+ void (*send_fec)(struct sender_client *sc, char *buf, size_t len);
+};
+
+/** Describes the current status of one paraslash sender. */
struct sender_status {
+ /** The file descriptor of the socket this sender is listening on. */
int listen_fd;
+ /** The TCP/DCCP port used by this sender. */
int port;
+ /** The current number of simultaneous connections. */
int num_clients;
+ /** The maximal number of simultaneous connections. */
int max_clients;
+ /** Whether the access control list is a whitelist. */
int default_deny;
- /** The list of connected clients. */
- struct list_head client_list;
/** The whitelist/blacklist. */
struct list_head acl;
+ /** The list of connected clients. */
+ struct list_head client_list;
};
void shutdown_client(struct sender_client *sc, struct sender_status *ss);
void shutdown_clients(struct sender_status *ss);
-void send_chunk(struct sender_client *sc, struct sender_status *ss,
- size_t max_bytes_per_write, long unsigned current_chunk,
- const char *buf, size_t len);
void init_sender_status(struct sender_status *ss, char **access_arg, int num_access_args,
int port, int max_clients, int default_deny);
-char *get_sender_info(struct sender_status *ss, char *name);
+char *get_sender_info(struct sender_status *ss, const char *name);
void generic_com_allow(struct sender_command_data *scd,
struct sender_status *ss);
int generic_com_on(struct sender_status *ss, unsigned protocol);
void generic_com_off(struct sender_status *ss);
char *generic_sender_help(void);
-struct sender_client *accept_sender_client(struct sender_status *ss);
+struct sender_client *accept_sender_client(struct sender_status *ss, fd_set *rfds);
+int send_queued_chunks(int fd, struct chunk_queue *cq);
+int parse_fec_url(const char *arg, struct sender_command_data *scd);