X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=send.h;h=c84545c97bac51e1ad0fb3755cc878b48021acf9;hp=d3be46f07ac756ed270f4908ad3ecf0007025c4f;hb=d0d27cfa56d05eaa0e5567c75adfe606eab2957e;hpb=2aa98426fca67a8b9c075ca7efea54aef18c0380

diff --git a/send.h b/send.h
index d3be46f0..c84545c9 100644
--- a/send.h
+++ b/send.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2005-2009 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2005-2012 Andre Noll <maan@systemlinux.org>
  *
  * Licensed under the GPL v2. For licencing details see COPYING.
  */
@@ -47,7 +47,7 @@ struct 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 *header_buf,
 		size_t header_len);
@@ -87,6 +87,15 @@ struct sender {
 	 * 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. */
@@ -105,6 +114,41 @@ struct sender_client {
 	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. */
@@ -125,10 +169,6 @@ struct sender_status {
 
 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, const char *header_buf,
-		size_t header_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, const char *name);
@@ -140,7 +180,6 @@ void generic_com_deny(struct sender_command_data *scd,
 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);
-int send_queued_chunks(int fd, struct chunk_queue *cq,
-		size_t max_bytes_per_write);
+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);