Chris@4: /*
Chris@4:  *  Copyright (C) 2004 Steve Harris
Chris@4:  *
Chris@4:  *  This program is free software; you can redistribute it and/or
Chris@4:  *  modify it under the terms of the GNU Lesser General Public License
Chris@4:  *  as published by the Free Software Foundation; either version 2.1
Chris@4:  *  of the License, or (at your option) any later version.
Chris@4:  *
Chris@4:  *  This program is distributed in the hope that it will be useful,
Chris@4:  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
Chris@4:  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
Chris@4:  *  GNU Lesser General Public License for more details.
Chris@4:  *
Chris@4:  *  $Id$
Chris@4:  */
Chris@4: 
Chris@4: #ifndef LO_LOWLEVEL_H
Chris@4: #define LO_LOWLEVEL_H
Chris@4: 
Chris@4: #include "lo/lo_osc_types.h"
Chris@4: 
Chris@4: /**
Chris@4:  * \file lo_lowlevel.h The liblo headerfile defining the low-level API
Chris@4:  * functions.
Chris@4:  */
Chris@4: 
Chris@4: #ifdef __cplusplus
Chris@4: extern "C" {
Chris@4: #endif
Chris@4: 
Chris@4: #include <stdarg.h>
Chris@4: #ifdef _MSC_VER
Chris@4: #define ssize_t SSIZE_T
Chris@4: #define uint32_t unsigned __int32
Chris@4: #else
Chris@4: #include <stdint.h>
Chris@4: #endif
Chris@4: 
Chris@4: #include "lo/lo_types.h"
Chris@4: #include "lo/lo_errors.h"
Chris@4: 
Chris@4: /**
Chris@4:  * \defgroup liblolowlevel Low-level OSC API
Chris@4:  *
Chris@4:  * Use these functions if you require more precise control over OSC message
Chris@4:  * contruction or handling that what is provided in the high-level functions
Chris@4:  * described in liblo.
Chris@4:  * @{
Chris@4:  */
Chris@4: 
Chris@4: /**
Chris@4:  * \brief Type used to represent numerical values in conversions between OSC
Chris@4:  * types.
Chris@4:  */
Chris@4: typedef long double lo_hires;
Chris@4: 
Chris@4: 
Chris@4: 
Chris@4: 
Chris@4: /**
Chris@4:  * \brief Send a lo_message object to target targ
Chris@4:  *
Chris@4:  * This is slightly more efficient than lo_send() if you want to send a lot of
Chris@4:  * similar messages. The messages are constructed with the lo_message_new() and
Chris@4:  * \ref lo_message_add_int32 "lo_message_add*()" functions.
Chris@4:  */
Chris@4: int lo_send_message(lo_address targ, const char *path, lo_message msg);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief Send a lo_message object to target targ from address of serv
Chris@4:  *
Chris@4:  * This is slightly more efficient than lo_send() if you want to send a lot of
Chris@4:  * similar messages. The messages are constructed with the lo_message_new() and
Chris@4:  * \ref lo_message_add_int32 "lo_message_add*()" functions.
Chris@4:  *
Chris@4:  * \param targ The address to send the message to
Chris@4:  * \param serv The server socket to send the message from
Chris@4:  *              (can be NULL to use new socket)
Chris@4:  * \param path The path to send the message to
Chris@4:  * \param msg  The bundle itself
Chris@4:  */
Chris@4: int lo_send_message_from(lo_address targ, lo_server serv, 
Chris@4:      const char *path, lo_message msg);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief Send a lo_bundle object to address targ
Chris@4:  *
Chris@4:  * Bundles are constructed with the
Chris@4:  * lo_bundle_new() and lo_bundle_add_message() functions.
Chris@4:  */
Chris@4: int lo_send_bundle(lo_address targ, lo_bundle b);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief Send a lo_bundle object to address targ from address of serv
Chris@4:  *
Chris@4:  * Bundles are constructed with the
Chris@4:  * lo_bundle_new() and lo_bundle_add_message() functions.
Chris@4:  *
Chris@4:  * \param targ The address to send the bundle to
Chris@4:  * \param serv The server socket to send the bundle from 
Chris@4:  *              (can be NULL to use new socket)
Chris@4:  * \param b    The bundle itself
Chris@4:  */
Chris@4: int lo_send_bundle_from(lo_address targ, lo_server serv, lo_bundle b);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief Create a new lo_message object
Chris@4:  */
Chris@4: lo_message lo_message_new();
Chris@4: 
Chris@4: /**
Chris@4:  * \brief Free memory allocated by lo_message_new() and any subsequent
Chris@4:  * \ref lo_message_add_int32 lo_message_add*() calls.
Chris@4:  */
Chris@4: void lo_message_free(lo_message m);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief Append a number of arguments to a message.
Chris@4:  *
Chris@4:  * The data will be added in OSC byteorder (bigendian).
Chris@4:  *
Chris@4:  * \param m The message to be extended.
Chris@4:  * \param types The types of the data items in the message, types are defined in
Chris@4:  * lo_types_common.h
Chris@4:  * \param ... The data values to be transmitted. The types of the arguments
Chris@4:  * passed here must agree with the types specified in the type parameter.
Chris@4:  *
Chris@4:  * \return Less than 0 on failure, 0 on success.
Chris@4:  */
Chris@4: int lo_message_add(lo_message m, const char *types, ...);
Chris@4: 
Chris@4: /** \internal \brief the real message_add function (don't call directly) */
Chris@4: int lo_message_add_internal(lo_message m,  const char *file, const int line,
Chris@4:                             const char *types, ...);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief Append a varargs list to a message.
Chris@4:  *
Chris@4:  * The data will be added in OSC byteorder (bigendian).
Chris@4:  * IMPORTANT: args list must be terminated with LO_ARGS_END, or this call will
Chris@4:  * fail.  This is used to do simple error checking on the sizes of parameters
Chris@4:  * passed.
Chris@4:  *
Chris@4:  * \param m The message to be extended.
Chris@4:  * \param types The types of the data items in the message, types are defined in
Chris@4:  * lo_types_common.h
Chris@4:  * \param ap The va_list created by a C function declared with an
Chris@4:  * ellipsis (...) argument, and pre-initialised with
Chris@4:  * "va_start(ap)". The types of the arguments passed here must agree
Chris@4:  * with the types specified in the type parameter.
Chris@4:  *
Chris@4:  * \return Less than 0 on failure, 0 on success.
Chris@4:  */
Chris@4: int lo_message_add_varargs(lo_message m, const char *types, va_list ap);
Chris@4: 
Chris@4: /** \internal \brief the real message_add_varargs function (don't call directly) */
Chris@4: int lo_message_add_varargs_internal(lo_message m, const char *types, va_list ap,
Chris@4:                                     const char *file, const int line);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief Append a data item and typechar of the specified type to a message.
Chris@4:  *
Chris@4:  * The data will be added in OSC byteorder (bigendian).
Chris@4:  *
Chris@4:  * \param m The message to be extended.
Chris@4:  * \param a The data item.
Chris@4:  *
Chris@4:  * \return Less than 0 on failure, 0 on success.
Chris@4:  */
Chris@4: int lo_message_add_int32(lo_message m, int32_t a);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief  Append a data item and typechar of the specified type to a message.
Chris@4:  * See lo_message_add_int32() for details.
Chris@4:  *
Chris@4:  * \return Less than 0 on failure, 0 on success.
Chris@4:  */
Chris@4: int lo_message_add_float(lo_message m, float a);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief  Append a data item and typechar of the specified type to a message.
Chris@4:  * See lo_message_add_int32() for details.
Chris@4:  *
Chris@4:  * \return Less than 0 on failure, 0 on success.
Chris@4:  */
Chris@4: int lo_message_add_string(lo_message m, const char *a);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief  Append a data item and typechar of the specified type to a message.
Chris@4:  * See lo_message_add_int32() for details.
Chris@4:  *
Chris@4:  * \return Less than 0 on failure, 0 on success.
Chris@4:  */
Chris@4: int lo_message_add_blob(lo_message m, lo_blob a);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief  Append a data item and typechar of the specified type to a message.
Chris@4:  * See lo_message_add_int32() for details.
Chris@4:  *
Chris@4:  * \return Less than 0 on failure, 0 on success.
Chris@4:  */
Chris@4: int lo_message_add_int64(lo_message m, int64_t a);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief  Append a data item and typechar of the specified type to a message.
Chris@4:  * See lo_message_add_int32() for details.
Chris@4:  *
Chris@4:  * \return Less than 0 on failure, 0 on success.
Chris@4:  */
Chris@4: int lo_message_add_timetag(lo_message m, lo_timetag a);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief  Append a data item and typechar of the specified type to a message.
Chris@4:  * See lo_message_add_int32() for details.
Chris@4:  *
Chris@4:  * \return Less than 0 on failure, 0 on success.
Chris@4:  */
Chris@4: int lo_message_add_double(lo_message m, double a);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief  Append a data item and typechar of the specified type to a message.
Chris@4:  * See lo_message_add_int32() for details.
Chris@4:  *
Chris@4:  * \return Less than 0 on failure, 0 on success.
Chris@4:  */
Chris@4: int lo_message_add_symbol(lo_message m, const char *a);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief  Append a data item and typechar of the specified type to a message.
Chris@4:  * See lo_message_add_int32() for details.
Chris@4:  *
Chris@4:  * \return Less than 0 on failure, 0 on success.
Chris@4:  */
Chris@4: int lo_message_add_char(lo_message m, char a);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief  Append a data item and typechar of the specified type to a message.
Chris@4:  * See lo_message_add_int32() for details.
Chris@4:  *
Chris@4:  * \return Less than 0 on failure, 0 on success.
Chris@4:  */
Chris@4: int lo_message_add_midi(lo_message m, uint8_t a[4]);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief  Append a data item and typechar of the specified type to a message.
Chris@4:  * See lo_message_add_int32() for details.
Chris@4:  *
Chris@4:  * \return Less than 0 on failure, 0 on success.
Chris@4:  */
Chris@4: int lo_message_add_true(lo_message m);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief  Append a data item and typechar of the specified type to a message.
Chris@4:  * See lo_message_add_int32() for details.
Chris@4:  *
Chris@4:  * \return Less than 0 on failure, 0 on success.
Chris@4:  */
Chris@4: int lo_message_add_false(lo_message m);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief  Append a data item and typechar of the specified type to a message.
Chris@4:  * See lo_message_add_int32() for details.
Chris@4:  *
Chris@4:  * \return Less than 0 on failure, 0 on success.
Chris@4:  */
Chris@4: int lo_message_add_nil(lo_message m);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief  Append a data item and typechar of the specified type to a message.
Chris@4:  * See lo_message_add_int32() for details.
Chris@4:  *
Chris@4:  * \return Less than 0 on failure, 0 on success.
Chris@4:  */
Chris@4: int lo_message_add_infinitum(lo_message m);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief  Returns the source (lo_address) of an incoming message.
Chris@4:  *
Chris@4:  * Returns NULL if the message is outgoing. Do not free the returned address.
Chris@4:  */
Chris@4: lo_address lo_message_get_source(lo_message m);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief  Returns the timestamp (lo_timetag *) of a bundled incoming message.
Chris@4:  *
Chris@4:  * Returns LO_TT_IMMEDIATE if the message is outgoing, or did not arrive
Chris@4:  * contained in a bundle. Do not free the returned timetag.
Chris@4:  */
Chris@4: lo_timetag lo_message_get_timestamp(lo_message m);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief  Return the message type tag string.
Chris@4:  *
Chris@4:  * The result is valid until further data is added with lo_message_add*().
Chris@4:  */
Chris@4: char *lo_message_get_types(lo_message m);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief  Return the message argument count.
Chris@4:  *
Chris@4:  * The result is valid until further data is added with lo_message_add*().
Chris@4:  */
Chris@4: int lo_message_get_argc(lo_message m);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief  Return the message arguments. Do not free the returned data.
Chris@4:  *
Chris@4:  * The result is valid until further data is added with lo_message_add*().
Chris@4:  */
Chris@4: lo_arg **lo_message_get_argv(lo_message m);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief  Return the length of a message in bytes.
Chris@4:  *
Chris@4:  * \param m The message to be sized
Chris@4:  * \param path The path the message will be sent to
Chris@4:  */
Chris@4: size_t lo_message_length(lo_message m, const char *path);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief  Serialise the lo_message object to an area of memory and return a
Chris@4:  * pointer to the serialised form.  Opposite of lo_message_deserialise().
Chris@4:  *
Chris@4:  * \param m The message to be serialised
Chris@4:  * \param path The path the message will be sent to
Chris@4:  * \param to The address to serialise to, memory will be allocated if to is
Chris@4:  * NULL.
Chris@4:  * \param size If this pointer is non-NULL the size of the memory area
Chris@4:  * will be written here
Chris@4:  *
Chris@4:  * The returned form is suitable to be sent over a low level OSC transport,
Chris@4:  * having the correct endianess and bit-packed structure.
Chris@4:  */
Chris@4: void *lo_message_serialise(lo_message m, const char *path, void *to,
Chris@4: 			   size_t *size);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief  Deserialise a raw OSC message and return a new lo_message object.
Chris@4:  * Opposite of lo_message_serialise().
Chris@4:  *
Chris@4:  * \param data Pointer to the raw OSC message data in network transmission form
Chris@4:  * (network byte order where appropriate).
Chris@4:  * \param size The size of data in bytes
Chris@4:  * \param result If this pointer is non-NULL, the result or error code will
Chris@4:  * be written here.
Chris@4:  *
Chris@4:  * Returns a new lo_message, or NULL if deserialisation fails.
Chris@4:  * Use lo_message_free() to free the resulting object.
Chris@4:  */
Chris@4: lo_message lo_message_deserialise(void *data, size_t size, int *result);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief  Dispatch a raw block of memory containing an OSC message.
Chris@4:  *
Chris@4:  * This is useful when a raw block of memory is available that is
Chris@4:  * structured as OSC, and you wish to use liblo to dispatch the
Chris@4:  * message to a handler function as if it had been received over the
Chris@4:  * network.
Chris@4:  *
Chris@4:  * \param s The lo_server to use for dispatching.
Chris@4:  * \param data Pointer to the raw OSC message data in network transmission form
Chris@4:  * (network byte order where appropriate).
Chris@4:  * \param size The size of data in bytes
Chris@4:  *
Chris@4:  * Returns the number of bytes used if successful, or less than 0 otherwise.
Chris@4:  */
Chris@4: int lo_server_dispatch_data(lo_server s, void *data, size_t size);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief  Return the hostname of a lo_address object
Chris@4:  *
Chris@4:  * Returned value must not be modified or free'd. Value will be a dotted quad,
Chris@4:  * colon'd IPV6 address, or resolvable name.
Chris@4:  */
Chris@4: const char *lo_address_get_hostname(lo_address a);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief  Return the port/service name of a lo_address object
Chris@4:  *
Chris@4:  * Returned value must not be modified or free'd. Value will be a service name
Chris@4:  * or ASCII representation of the port number.
Chris@4:  */
Chris@4: const char *lo_address_get_port(lo_address a);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief  Return the protocol of a lo_address object
Chris@4:  *
Chris@4:  * Returned value will be one of LO_UDP, LO_TCP or LO_UNIX.
Chris@4:  */
Chris@4: int lo_address_get_protocol(lo_address a);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief  Return a URL representing an OSC address
Chris@4:  *
Chris@4:  * Returned value must be free'd.
Chris@4:  */
Chris@4: char *lo_address_get_url(lo_address a);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief Set the Time-to-Live value for a given target address.
Chris@4:  * 
Chris@4:  * This is required for sending multicast UDP messages.  A value of 1
Chris@4:  * (the usual case) keeps the message within the subnet, while 255
Chris@4:  * means a global, unrestricted scope.
Chris@4:  * 
Chris@4:  * \param t An OSC address.
Chris@4:  * \param ttl An integer specifying the scope of a multicast UDP message.
Chris@4:  */ 
Chris@4: void lo_address_set_ttl(lo_address t, int ttl);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief Get the Time-to-Live value for a given target address.
Chris@4:  * 
Chris@4:  * \param t An OSC address.
Chris@4:  * \return An integer specifying the scope of a multicast UDP message.
Chris@4:  */ 
Chris@4: int lo_address_get_ttl(lo_address t);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief  Create a new bundle object.
Chris@4:  *
Chris@4:  * OSC Bundles encapsulate one or more OSC messages and may include a timestamp
Chris@4:  * indicating when the bundle should be dispatched.
Chris@4:  *
Chris@4:  * \param tt The timestamp when the bundle should be handled by the receiver.
Chris@4:  *           Pass LO_TT_IMMEDIATE if you want the receiving server to dispatch
Chris@4:  *           the bundle as soon as it receives it.
Chris@4:  */
Chris@4: lo_bundle lo_bundle_new(lo_timetag tt);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief  Adds an OSC message to an existing bundle.
Chris@4:  *
Chris@4:  * The message passed is appended to the list of messages in the bundle to be
Chris@4:  * dispatched to 'path'.
Chris@4:  *
Chris@4:  * \return 0 if successful, less than 0 otherwise.
Chris@4:  */
Chris@4: int lo_bundle_add_message(lo_bundle b, const char *path, lo_message m);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief  Return the length of a bundle in bytes.
Chris@4:  *
Chris@4:  * Includes the marker and typetage length.
Chris@4:  *
Chris@4:  * \param b The bundle to be sized
Chris@4:  */
Chris@4: size_t lo_bundle_length(lo_bundle b);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief  Serialise the bundle object to an area of memory and return a
Chris@4:  * pointer to the serialised form.
Chris@4:  *
Chris@4:  * \param b The bundle to be serialised
Chris@4:  * \param to The address to serialise to, memory will be allocated if to is
Chris@4:  * NULL.
Chris@4:  * \param size If this pointer is non-NULL the size of the memory area
Chris@4:  * will be written here
Chris@4:  *
Chris@4:  * The returned form is suitable to be sent over a low level OSC transport,
Chris@4:  * having the correct endianess and bit-packed structure.
Chris@4:  */
Chris@4: void *lo_bundle_serialise(lo_bundle b, void *to, size_t *size);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief  Frees the memory taken by a bundle object.
Chris@4:  *
Chris@4:  * \param b The bundle to be freed.
Chris@4: */
Chris@4: void lo_bundle_free(lo_bundle b);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief  Frees the memory taken by a bundle object and messages in the bundle.
Chris@4:  *
Chris@4:  * \param b The bundle, which may contain messages, to be freed.
Chris@4: */
Chris@4: void lo_bundle_free_messages(lo_bundle b);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief Return true if the type specified has a numerical value, such as
Chris@4:  * LO_INT32, LO_FLOAT etc.
Chris@4:  *
Chris@4:  * \param a The type to be tested.
Chris@4:  */
Chris@4: int lo_is_numerical_type(lo_type a);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief Return true if the type specified has a textual value, such as
Chris@4:  * LO_STRING or LO_SYMBOL.
Chris@4:  *
Chris@4:  * \param a The type to be tested.
Chris@4:  */
Chris@4: int lo_is_string_type(lo_type a);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief Attempt to convert one OSC type to another.
Chris@4:  *
Chris@4:  * Numerical types (eg LO_INT32, LO_FLOAT etc.) may be converted to other
Chris@4:  * numerical types and string types (LO_STRING and LO_SYMBOL) may be converted
Chris@4:  * to the other type. This is done automatically if a received message matches
Chris@4:  * the path, but not the exact types, and is coercible (ie. all numerical
Chris@4:  * types in numerical positions).
Chris@4:  *
Chris@4:  * On failure no translation occurs and false is returned.
Chris@4:  *
Chris@4:  * \param type_to   The type of the destination variable.
Chris@4:  * \param to        A pointer to the destination variable.
Chris@4:  * \param type_from The type of the source variable.
Chris@4:  * \param from      A pointer to the source variable.
Chris@4:  */
Chris@4: int lo_coerce(lo_type type_to, lo_arg *to, lo_type type_from, lo_arg *from);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief Return the numerical value of the given argument with the
Chris@4:  * maximum native system precision.
Chris@4:  */
Chris@4: lo_hires lo_hires_val(lo_type type, lo_arg *p);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief Create a new server instance.
Chris@4:  *
Chris@4:  * Using lo_server_recv(), lo_servers block until they receive OSC
Chris@4:  * messages.  If you want non-blocking behaviour see
Chris@4:  * lo_server_recv_noblock() or the \ref lo_server_thread_new
Chris@4:  * "lo_server_thread_*" functions.
Chris@4:  *
Chris@4:  * \param port If NULL is passed then an unused UDP port will be chosen by the
Chris@4:  * system, its number may be retrieved with lo_server_thread_get_port()
Chris@4:  * so it can be passed to clients. Otherwise a decimal port number, service
Chris@4:  * name or UNIX domain socket path may be passed.
Chris@4:  * \param err_h An error callback function that will be called if there is an
Chris@4:  * error in messge reception or server creation. Pass NULL if you do not want
Chris@4:  * error handling.
Chris@4:  */
Chris@4: lo_server lo_server_new(const char *port, lo_err_handler err_h);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief Create a new server instance, specifying protocol.
Chris@4:  *
Chris@4:  * Using lo_server_recv(), lo_servers block until they receive OSC
Chris@4:  * messages.  If you want non-blocking behaviour see
Chris@4:  * lo_server_recv_noblock() or the \ref lo_server_thread_new
Chris@4:  * "lo_server_thread_*" functions.
Chris@4:  *
Chris@4:  * \param port If using UDP then NULL may be passed to find an unused port.
Chris@4:  * Otherwise a decimal port number orservice name or may be passed.
Chris@4:  * If using UNIX domain sockets then a socket path should be passed here.
Chris@4:  * \param proto The protocol to use, should be one of LO_UDP, LO_TCP or LO_UNIX.
Chris@4:  * \param err_h An error callback function that will be called if there is an
Chris@4:  * error in messge reception or server creation. Pass NULL if you do not want
Chris@4:  * error handling.
Chris@4:  */
Chris@4: lo_server lo_server_new_with_proto(const char *port, int proto,
Chris@4:                                    lo_err_handler err_h);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief Create a new server instance, and join a UDP multicast group.
Chris@4:  * 
Chris@4:  * \param group The multicast group to join.  See documentation on IP
Chris@4:  * multicast for the acceptable address range; e.g., http://tldp.org/HOWTO/Multicast-HOWTO-2.html
Chris@4:  * \param port If using UDP then NULL may be passed to find an unused port.
Chris@4:  * Otherwise a decimal port number or service name or may be passed.
Chris@4:  * If using UNIX domain sockets then a socket path should be passed here.
Chris@4:  * \param err_h An error callback function that will be called if there is an
Chris@4:  * error in messge reception or server creation. Pass NULL if you do not want
Chris@4:  * error handling.
Chris@4:  */
Chris@4: lo_server lo_server_new_multicast(const char *group, const char *port,
Chris@4:                                   lo_err_handler err_h);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief Free up memory used by the lo_server object
Chris@4:  */
Chris@4: void lo_server_free(lo_server s);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief Wait for an OSC message to be received
Chris@4:  *
Chris@4:  * \param s The server to wait for connections on.
Chris@4:  * \param timeout A timeout in milliseconds to wait for the incoming packet.
Chris@4:  * a value of 0 will return immediately.
Chris@4:  *
Chris@4:  * The return value is 1 if there is a message waiting or 0 if
Chris@4:  * there is no message. If there is a message waiting you can now
Chris@4:  * call lo_server_recv() to receive that message.
Chris@4:  */
Chris@4: int lo_server_wait(lo_server s, int timeout);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief Look for an OSC message waiting to be received
Chris@4:  *
Chris@4:  * \param s The server to wait for connections on.
Chris@4:  * \param timeout A timeout in milliseconds to wait for the incoming packet.
Chris@4:  * a value of 0 will return immediately.
Chris@4:  *
Chris@4:  * The return value is the number of bytes in the received message or 0 if
Chris@4:  * there is no message. The message will be dispatched to a matching method
Chris@4:  * if one is found.
Chris@4:  */
Chris@4: int lo_server_recv_noblock(lo_server s, int timeout);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief Block, waiting for an OSC message to be received
Chris@4:  *
Chris@4:  * The return value is the number of bytes in the received message. The message
Chris@4:  * will be dispatched to a matching method if one is found.
Chris@4:  */
Chris@4: int lo_server_recv(lo_server s);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief Add an OSC method to the specifed server.
Chris@4:  *
Chris@4:  * \param s The server the method is to be added to.
Chris@4:  * \param path The OSC path to register the method to. If NULL is passed the
Chris@4:  * method will match all paths.
Chris@4:  * \param typespec The typespec the method accepts. Incoming messages with
Chris@4:  * similar typespecs (e.g. ones with numerical types in the same position) will
Chris@4:  * be coerced to the typespec given here.
Chris@4:  * \param h The method handler callback function that will be called if a
Chris@4:  * matching message is received
Chris@4:  * \param user_data A value that will be passed to the callback function, h,
Chris@4:  * when its invoked matching from this method.
Chris@4:  */
Chris@4: lo_method lo_server_add_method(lo_server s, const char *path,
Chris@4:                                const char *typespec, lo_method_handler h,
Chris@4:                                void *user_data);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief Delete an OSC method from the specifed server.
Chris@4:  *
Chris@4:  * \param s The server the method is to be removed from.
Chris@4:  * \param path The OSC path of the method to delete. If NULL is passed the
Chris@4:  * method will match the generic handler.
Chris@4:  * \param typespec The typespec the method accepts.
Chris@4:  */
Chris@4: void lo_server_del_method(lo_server s, const char *path,
Chris@4:                                const char *typespec);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief Return the file descriptor of the server socket.
Chris@4:  *
Chris@4:  * If the server protocol supports exposing the server's underlying
Chris@4:  * receive mechanism for monitoring with select() or poll(), this function
Chris@4:  * returns the file descriptor needed, otherwise, it returns -1.
Chris@4:  *
Chris@4:  * WARNING: when using this function beware that not all OSC packets that are
Chris@4:  * received are dispatched immediately. lo_server_events_pending() and
Chris@4:  * lo_server_next_event_delay() can be used to tell if there are pending
Chris@4:  * events and how long before you should attempt to receive them.
Chris@4:  */
Chris@4: int lo_server_get_socket_fd(lo_server s);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief Return the port number that the server has bound to.
Chris@4:  *
Chris@4:  * Useful when NULL is passed for the port number and you wish to know how to
Chris@4:  * address the server.
Chris@4:  */
Chris@4: int lo_server_get_port(lo_server s);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief  Return the protocol that the server is using.
Chris@4:  *
Chris@4:  * Returned value will be one of LO_UDP, LO_TCP or LO_UNIX.
Chris@4:  */
Chris@4: int lo_server_get_protocol(lo_server s);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief Return an OSC URL that can be used to contact the server.
Chris@4:  *
Chris@4:  * The return value should be free()'d when it is no longer needed.
Chris@4:  */
Chris@4: char *lo_server_get_url(lo_server s);
Chris@4: 
Chris@4: /** 
Chris@4:  * \brief Return true if there are scheduled events (eg. from bundles) 
Chris@4:  * waiting to be dispatched by the server
Chris@4:  */
Chris@4: int lo_server_events_pending(lo_server s);
Chris@4: 
Chris@4: /** 
Chris@4:  * \brief Return the time in seconds until the next scheduled event.
Chris@4:  *
Chris@4:  * If the delay is greater than 100 seconds then it will return 100.0.
Chris@4:  */
Chris@4: double lo_server_next_event_delay(lo_server s);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief Return the protocol portion of an OSC URL, eg. udp, tcp.
Chris@4:  *
Chris@4:  * This library uses OSC URLs of the form: osc.prot://hostname:port/path if the
Chris@4:  * prot part is missing, UDP is assumed.
Chris@4:  *
Chris@4:  * The return value should be free()'d when it is no longer needed.
Chris@4:  */
Chris@4: char *lo_url_get_protocol(const char *url);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief Return the protocol ID of an OSC URL.
Chris@4:  *
Chris@4:  * This library uses OSC URLs of the form: osc.prot://hostname:port/path if the
Chris@4:  * prot part is missing, UDP is assumed.
Chris@4:  * Returned value will be one of LO_UDP, LO_TCP, LO_UNIX or -1.
Chris@4:  *
Chris@4:  * \return An integer specifying the protocol. Return -1 when the protocol is
Chris@4:  * not supported by liblo.
Chris@4:  *
Chris@4:  */
Chris@4: int lo_url_get_protocol_id(const char *url);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief Return the hostname portion of an OSC URL.
Chris@4:  *
Chris@4:  * The return value should be free()'d when it is no longer needed.
Chris@4:  */
Chris@4: char *lo_url_get_hostname(const char *url);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief Return the port portion of an OSC URL.
Chris@4:  *
Chris@4:  * The return value should be free()'d when it is no longer needed.
Chris@4:  */
Chris@4: char *lo_url_get_port(const char *url);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief Return the path portion of an OSC URL.
Chris@4:  *
Chris@4:  * The return value should be free()'d when it is no longer needed.
Chris@4:  */
Chris@4: char *lo_url_get_path(const char *url);
Chris@4: 
Chris@4: /* utility functions */
Chris@4: 
Chris@4: /**
Chris@4:  * \brief A function to calculate the amount of OSC message space required by a
Chris@4:  * C char *.
Chris@4:  *
Chris@4:  * Returns the storage size in bytes, which will always be a multiple of four.
Chris@4:  */
Chris@4: int lo_strsize(const char *s);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief A function to calculate the amount of OSC message space required by a
Chris@4:  * lo_blob object.
Chris@4:  *
Chris@4:  * Returns the storage size in bytes, which will always be a multiple of four.
Chris@4:  */
Chris@4: uint32_t lo_blobsize(lo_blob b);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief Test a string against an OSC pattern glob
Chris@4:  *
Chris@4:  * \param str The string to test
Chris@4:  * \param p   The pattern to test against
Chris@4:  */
Chris@4: int lo_pattern_match(const char *str, const char *p);
Chris@4: 
Chris@4: /** \internal \brief the real send function (don't call directly) */
Chris@4: int lo_send_internal(lo_address t, const char *file, const int line,
Chris@4:      const char *path, const char *types, ...);
Chris@4: /** \internal \brief the real send_timestamped function (don't call directly) */
Chris@4: int lo_send_timestamped_internal(lo_address t, const char *file, const int line,
Chris@4:      lo_timetag ts, const char *path, const char *types, ...);
Chris@4: /** \internal \brief the real lo_send_from() function (don't call directly) */
Chris@4: int lo_send_from_internal(lo_address targ, lo_server from, const char *file, 
Chris@4:      const int line, const lo_timetag ts, 
Chris@4:      const char *path, const char *types, ...);
Chris@4: 
Chris@4: 
Chris@4: /** \brief Find the time difference between two timetags
Chris@4:  *
Chris@4:  * Returns a - b in seconds.
Chris@4:  */
Chris@4: double lo_timetag_diff(lo_timetag a, lo_timetag b);
Chris@4: 
Chris@4: /** \brief Return a timetag for the current time
Chris@4:  *
Chris@4:  * On exit the timetag pointed to by t is filled with the OSC
Chris@4:  * representation of this instant in time.
Chris@4:  */
Chris@4: void lo_timetag_now(lo_timetag *t);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief Return the storage size, in bytes, of the given argument.
Chris@4:  */
Chris@4: size_t lo_arg_size(lo_type type, void *data);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief Given a raw OSC message, return the message path.
Chris@4:  *
Chris@4:  * \param data      A pointer to the raw OSC message data.
Chris@4:  * \param size      The size of data in bytes (total buffer bytes).
Chris@4:  *
Chris@4:  * Returns the message path or NULL if an error occurs.
Chris@4:  * Do not free() the returned pointer.
Chris@4:  */
Chris@4: char *lo_get_path(void *data, ssize_t size);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief Convert the specified argument to host byte order where necessary.
Chris@4:  *
Chris@4:  * \param type The OSC type of the data item (eg. LO_FLOAT).
Chris@4:  * \param data A pointer to the data item to be converted. It is changed
Chris@4:  * in-place.
Chris@4:  */
Chris@4: void lo_arg_host_endian(lo_type type, void *data);
Chris@4: 
Chris@4: /**
Chris@4:  * \brief Convert the specified argument to network byte order where necessary.
Chris@4:  *
Chris@4:  * \param type The OSC type of the data item (eg. LO_FLOAT).
Chris@4:  * \param data A pointer to the data item to be converted. It is changed
Chris@4:  * in-place.
Chris@4:  */
Chris@4: void lo_arg_network_endian(lo_type type, void *data);
Chris@4: 
Chris@4: /** @} */
Chris@4: 
Chris@4: /* prettyprinters */
Chris@4: 
Chris@4: /**
Chris@4:  * \defgroup pp Prettyprinting functions
Chris@4:  *
Chris@4:  * These functions all print an ASCII representation of their argument to
Chris@4:  * stdout. Useful for debugging.
Chris@4:  * @{
Chris@4:  */
Chris@4: 
Chris@4: /** \brief Pretty-print a lo_bundle object. */
Chris@4: void lo_bundle_pp(lo_bundle b);
Chris@4: 
Chris@4: /** \brief Pretty-print a lo_message object. */
Chris@4: void lo_message_pp(lo_message m);
Chris@4: 
Chris@4: /** \brief Pretty-print a set of typed arguments.
Chris@4:  * \param type A type string in the form provided to lo_send().
Chris@4:  * \param data An OSC data pointer, like that provided in the
Chris@4:  * lo_method_handler.
Chris@4:  */
Chris@4: void lo_arg_pp(lo_type type, void *data);
Chris@4: 
Chris@4: /** \brief Pretty-print a lo_server object. */
Chris@4: void lo_server_pp(lo_server s);
Chris@4: 
Chris@4: /** \brief Pretty-print a lo_method object. */
Chris@4: void lo_method_pp(lo_method m);
Chris@4: 
Chris@4: /** \brief Pretty-print a lo_method object, but prepend a given prefix
Chris@4:  * to all field names. */
Chris@4: void lo_method_pp_prefix(lo_method m, const char *p);
Chris@4: 
Chris@4: /** \brief Pretty-print a lo_server_thread object. */
Chris@4: void lo_server_thread_pp(lo_server_thread st);
Chris@4: /** @} */
Chris@4: 
Chris@4: #ifdef __cplusplus
Chris@4: }
Chris@4: #endif
Chris@4: 
Chris@4: #endif