X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=send.h;h=0c74f0ea93208ec6b24878c963e671a4da8adb8d;hp=d3be46f07ac756ed270f4908ad3ecf0007025c4f;hb=7eaf2faf618705c97c77750371e177108aaa5897;hpb=72f7d7aca73e7848bcf6b841046893bf5e69f6b5 diff --git a/send.h b/send.h index d3be46f0..0c74f0ea 100644 --- a/send.h +++ b/send.h @@ -1,13 +1,26 @@ /* - * Copyright (C) 2005-2009 Andre Noll + * Copyright (C) 2005 Andre Noll * * Licensed under the GPL v2. For licencing details see COPYING. */ /** \file send.h Sender-related defines and structures. */ -/** The sender subcommands. */ -enum {SENDER_ADD, SENDER_DELETE, SENDER_ALLOW, SENDER_DENY, SENDER_ON, SENDER_OFF, NUM_SENDER_CMDS}; +#define SENDER_SUBCOMMANDS \ + SENDER_SUBCOMMAND(add) /**< Add a target (udp only). */ \ + SENDER_SUBCOMMAND(delete) /**< Delete a target (udp only). */ \ + SENDER_SUBCOMMAND(allow) /**< Allow connections from given IP address(es). */ \ + SENDER_SUBCOMMAND(deny) /**< Deny connections from given IP address(es). */ \ + SENDER_SUBCOMMAND(on) /**< Activate the sender. */ \ + SENDER_SUBCOMMAND(off) /**< Deactivate the sender. */ \ + +#define SENDER_SUBCOMMAND(_name) SENDER_ ## _name, +enum sender_subcommand { + SENDER_SUBCOMMANDS + NUM_SENDER_CMDS /**< Used as array size in struct \ref sender. */ +}; +#undef SENDER_SUBCOMMAND +#define SENDER_SUBCOMMAND(_name) #_name, /** * Describes one supported sender of para_server. @@ -37,7 +50,7 @@ struct sender { * * The result must be dynamically allocated and is freed by the caller. */ - char* (*info)(void); + char* (*status)(void); /** * The send-hook. * @@ -47,7 +60,7 @@ 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 +100,15 @@ 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 +127,41 @@ 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. */ @@ -125,13 +182,9 @@ 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); +char *generic_sender_status(struct sender_status *ss, const char *name); void generic_com_allow(struct sender_command_data *scd, struct sender_status *ss); @@ -140,7 +193,6 @@ 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);