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/*
Copyright (C) 2001 Paul Davis
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
$Id: jack.h,v 1.64 2004/07/15 03:07:28 trutkin Exp $
*/
#ifndef __jack_h__
#define __jack_h__
#ifdef __cplusplus
extern "C" {
#endif
#include <pthread.h>
#include <jack/types.h>
#include <jack/transport.h>
/**
* Note: More documentation can be found in jack/types.h.
*/
/**
* Attempt to become an external client of the Jack server.
*
* JACK is evolving a mechanism for automatically starting the server
* when needed. As a transition, jack_client_new() only does this
* when $JACK_START_SERVER is defined in the environment of the
* calling process. In the future this will become normal behavior.
* In either case, defining $JACK_NO_START_SERVER disables this
* feature.
*
* @param client_name of at most jack_client_name_size() characters.
*
* @return Opaque client handle if successful, otherwise NULL.
*
* @note Failure generally means that the JACK server is not running.
* If there was some other problem, it will be reported via the @ref
* jack_error_callback mechanism.
*/
jack_client_t *jack_client_new (const char *client_name);
/**
* Disconnects an external client from a JACK server.
*
* @return 0 on success, otherwise a non-zero error code
*/
int jack_client_close (jack_client_t *client);
/**
* @return the maximum number of characters in a JACK client name
* including the final NULL character. This value is a constant.
*/
int jack_client_name_size(void);
/**
* Attempt to load an internal client into the Jack server.
*
* Internal clients run within the JACK server process. They can use
* of the same functions as external clients. Each internal client
* must declare jack_initialize() and jack_finish() entry points,
* called at load and unload times. See inprocess.c for an example of
* how to write an internal client.
*
* @param client_name of at most jack_client_name_size() characters.
* @param so_name A path to a shared object file containing the code
* for the new client.
* @param so_data An arbitary string containing information to be
* passed to the jack_initialize() routine of the new client.
*/
int jack_internal_client_new (const char *client_name, const char *so_name,
const char *so_data);
/**
* Removes an internal client from a JACK server.
*
* @return 0 on success, otherwise a non-zero error code
*/
void jack_internal_client_close (const char *client_name);
/**
* @param client pointer to JACK client structure.
*
* Check if the JACK subsystem is running with -R (--realtime).
*
* @return 1 if JACK is running realtime, 0 otherwise
*/
int jack_is_realtime (jack_client_t *client);
/**
* @param client pointer to JACK client structure.
* @param function The jack_shutdown function pointer.
* @param arg The arguments for the jack_shutdown function.
*
* Register a function (and argument) to be called if and when the
* JACK server shuts down the client thread. The function must
* be written as if it were an asynchonrous POSIX signal
* handler --- use only async-safe functions, and remember that it
* is executed from another thread. A typical function might
* set a flag or write to a pipe so that the rest of the
* application knows that the JACK client thread has shut
* down.
*
* NOTE: clients do not need to call this. It exists only
* to help more complex clients understand what is going
* on. It should be called before jack_client_activate().
*/
void jack_on_shutdown (jack_client_t *client, void (*function)(void *arg), void *arg);
/**
* Tell the Jack server to call @a process_callback whenever there is
* work be done, passing @a arg as the second argument.
*
* The code in the supplied function must be suitable for real-time
* execution. That means that it cannot call functions that might
* block for a long time.á This includes malloc, free, printf,
* pthread_mutex_lock, sleep, wait, poll, select, pthread_join,
* pthread_cond_wait, etc, etc.á See
* http://jackit.sourceforge.net/docs/design/design.html#SECTION00411000000000000000
* for more information.
*
* @return 0 on success, otherwise a non-zero error code, causing JACK
* to remove that client from the process() graph.
*/
int jack_set_process_callback (jack_client_t *client,
JackProcessCallback process_callback,
void *arg);
/**
* Tell JACK to call @a thread_init_callback once just after
* the creation of the thread in which all other callbacks
* will be handled.
*
* The code in the supplied function does not need to be
* suitable for real-time execution.
*
* @return 0 on success, otherwise a non-zero error code, causing JACK
* to remove that client from the process() graph.
*/
int jack_set_thread_init_callback (jack_client_t *client,
JackThreadInitCallback thread_init_callback,
void *arg);
/**
* Tell the Jack server to call @a freewheel_callback
* whenever we enter or leave "freewheel" mode, passing @a
* arg as the second argument. The first argument to the
* callback will be non-zero if JACK is entering freewheel
* mode, and zero otherwise.
*
* @return 0 on success, otherwise a non-zero error code.
*/
int jack_set_freewheel_callback (jack_client_t *client,
JackFreewheelCallback freewheel_callback,
void *arg);
/**
* Start/Stop JACK's "freewheel" mode.
*
* When in "freewheel" mode, JACK no longer waits for
* any external event to begin the start of the next process
* cycle.
*
* As a result, freewheel mode causes "faster than realtime"
* execution of a JACK graph. If possessed, real-time
* scheduling is dropped when entering freewheel mode, and
* if appropriate it is reacquired when stopping.
*
* @param client pointer to JACK client structure
* @param onoff if non-zero, freewheel mode starts. Otherwise
* freewheel mode ends.
*
* @return 0 on success, otherwise a non-zero error code.
*/
int jack_set_freewheel(jack_client_t* client, int onoff);
/**
* Change the buffer size passed to the @a process_callback.
*
* This operation stops the JACK engine process cycle, then calls all
* registered @a bufsize_callback functions before restarting the
* process cycle. This will cause a gap in the audio flow, so it
* should only be done at appropriate stopping points.
*
* @see jack_set_buffer_size_callback()
*
* @param client pointer to JACK client structure.
* @param nframes new buffer size. Must be a power of two.
*
* @return 0 on success, otherwise a non-zero error code
*/
int jack_set_buffer_size (jack_client_t *client, jack_nframes_t nframes);
/**
* Tell JACK to call @a bufsize_callback whenever the size of the the
* buffer that will be passed to the @a process_callback is about to
* change. Clients that depend on knowing the buffer size must supply
* a @a bufsize_callback before activating themselves.
*
* @param client pointer to JACK client structure.
* @param bufsize_callback function to call when the buffer size changes.
* @param arg argument for @a bufsize_callback.
*
* @return 0 on success, otherwise a non-zero error code
*/
int jack_set_buffer_size_callback (jack_client_t *client,
JackBufferSizeCallback bufsize_callback,
void *arg);
/**
* Tell the Jack server to call @a srate_callback whenever the system
* sample rate changes.
*
* @return 0 on success, otherwise a non-zero error code
*/
int jack_set_sample_rate_callback (jack_client_t *client,
JackSampleRateCallback srate_callback,
void *arg);
/**
* Tell the Jack server to call 'registration_callback' whenever a port is registered
* or unregistered, passing 'arg' as a second argument.
*
* @return 0 on success, otherwise a non-zero error code
*/
int jack_set_port_registration_callback (jack_client_t *,
JackPortRegistrationCallback
registration_callback, void *arg);
/**
* Tell the Jack server to call 'registration_callback' whenever the processing
* graph is reordered, passing 'arg' as an argument.
*
* @return 0 on success, otherwise a non-zero error code
*/
int jack_set_graph_order_callback (jack_client_t *, JackGraphOrderCallback graph_callback, void *);
/**
* Tell the Jack server to call 'xrun_callback' whenever there is a xrun, passing
* 'arg' as an argument.
*
* @return 0 on success, otherwise a non-zero error code
*/
int jack_set_xrun_callback (jack_client_t *, JackXRunCallback xrun_callback, void *arg);
/**
* Tell the Jack server that the program is ready to start processing
* audio.
*
* @return 0 on success, otherwise a non-zero error code
*/
int jack_activate (jack_client_t *client);
/**
* Tell the Jack server to remove this @a client from the process
* graph. Also, disconnect all ports belonging to it, since inactive
* clients have no port connections.
*
* @return 0 on success, otherwise a non-zero error code
*/
int jack_deactivate (jack_client_t *client);
/**
* Create a new port for the client. This is an object used for moving
* data of any type in or out of the client. Ports may be connected
* in various ways.
*
* Each port has a short name. The port's full name contains the name
* of the client concatenated with a colon (:) followed by its short
* name. The jack_port_name_size() is the maximum length of this full
* name. Exceeding that will cause the port registration to fail and
* return NULL.
*
* All ports have a type, which may be any non-NULL and non-zero
* length string, passed as an argument. Some port types are built
* into the JACK API, currently only JACK_DEFAULT_AUDIO_TYPE.
*
* @param client pointer to JACK client structure.
* @param port_name non-empty short name for the new port (not
* including the leading @a "client_name:").
* @param port_type port type name. If longer than
* jack_port_type_size(), only that many characters are significant.
* @param flags @ref JackPortFlags bit mask.
* @param buffer_size must be non-zero if this is not a built-in @a
* port_type. Otherwise, it is ignored.
*
* @return jack_port_t pointer on success, otherwise NULL.
*/
jack_port_t *jack_port_register (jack_client_t *client,
const char *port_name,
const char *port_type,
unsigned long flags,
unsigned long buffer_size);
/**
* Remove the port from the client, disconnecting any existing
* connections.
*
* @return 0 on success, otherwise a non-zero error code
*/
int jack_port_unregister (jack_client_t *, jack_port_t *);
/**
* This returns a pointer to the memory area associated with the
* specified port. For an output port, it will be a memory area
* that can be written to; for an input port, it will be an area
* containing the data from the port's connection(s), or
* zero-filled. if there are multiple inbound connections, the data
* will be mixed appropriately.
*
* FOR OUTPUT PORTS ONLY
* ---------------------
* You may cache the value returned, but only between calls to
* your "blocksize" callback. For this reason alone, you should
* either never cache the return value or ensure you have
* a "blocksize" callback and be sure to invalidate the cached
* address from there.
*/
void *jack_port_get_buffer (jack_port_t *, jack_nframes_t);
/**
* @return the full name of the jack_port_t (including the @a
* "client_name:" prefix).
*
* @see jack_port_name_size().
*/
const char *jack_port_name (const jack_port_t *port);
/**
* @return the short name of the jack_port_t (not including the @a
* "client_name:" prefix).
*
* @see jack_port_name_size().
*/
const char *jack_port_short_name (const jack_port_t *port);
/**
* @return the @ref JackPortFlags of the jack_port_t.
*/
int jack_port_flags (const jack_port_t *port);
/**
* @return the @a port type, at most jack_port_type_size() characters
* including a final NULL.
*/
const char *jack_port_type (const jack_port_t *port);
/**
* @return TRUE if the jack_port_t belongs to the jack_client_t.
*/
int jack_port_is_mine (const jack_client_t *, const jack_port_t *port);
/**
* @return number of connections to or from @a port.
*
* @pre The calling client must own @a port.
*/
int jack_port_connected (const jack_port_t *port);
/**
* @return TRUE if the locally-owned @a port is @b directly connected
* to the @a port_name.
*
* @see jack_port_name_size()
*/
int jack_port_connected_to (const jack_port_t *port,
const char *port_name);
/**
* @return a null-terminated array of full port names to which the @a
* port is connected. If none, returns NULL.
*
* The caller is responsible for calling free(3) on any non-NULL
* returned value.
*
* @param port locally owned jack_port_t pointer.
*
* @see jack_port_name_size(), jack_port_get_all_connections()
*/
const char **jack_port_get_connections (const jack_port_t *port);
/**
* @return a null-terminated array of full port names to which the @a
* port is connected. If none, returns NULL.
*
* The caller is responsible for calling free(3) on any non-NULL
* returned value.
*
* This differs from jack_port_get_connections() in two important
* respects:
*
* 1) You may not call this function from code that is
* executed in response to a JACK event. For example,
* you cannot use it in a GraphReordered handler.
*
* 2) You need not be the owner of the port to get information
* about its connections.
*
* @see jack_port_name_size()
*/
const char **jack_port_get_all_connections (const jack_client_t *client,
const jack_port_t *port);
/**
* A client may call this on a pair of its own ports to
* semi-permanently wire them together. This means that
* a client that wants to direct-wire an input port to
* an output port can call this and then no longer
* have to worry about moving data between them. Any data
* arriving at the input port will appear automatically
* at the output port.
*
* The 'destination' port must be an output port. The 'source'
* port must be an input port. Both ports must belong to
* the same client. You cannot use this to tie ports between
* clients. That is what a connection is for.
*
* @return 0 on success, otherwise a non-zero error code
*/
int jack_port_tie (jack_port_t *src, jack_port_t *dst);
/**
* This undoes the effect of jack_port_tie(). The port
* should be same as the 'destination' port passed to
* jack_port_tie().
*
* @return 0 on success, otherwise a non-zero error code
*/
int jack_port_untie (jack_port_t *port);
/**
* A client may call this function to prevent other objects
* from changing the connection status of a port. The port
* must be owned by the calling client.
*
* @return 0 on success, otherwise a non-zero error code
*/
int jack_port_lock (jack_client_t *, jack_port_t *);
/**
* This allows other objects to change the connection status of a port.
*
* @return 0 on success, otherwise a non-zero error code
*/
int jack_port_unlock (jack_client_t *, jack_port_t *);
/**
* @return the time (in frames) between data being available or
* delivered at/to a port, and the time at which it arrived at or is
* delivered to the "other side" of the port. E.g. for a physical
* audio output port, this is the time between writing to the port and
* when the signal will leave the connector. For a physical audio
* input port, this is the time between the sound arriving at the
* connector and the corresponding frames being readable from the
* port.
*/
jack_nframes_t jack_port_get_latency (jack_port_t *port);
/**
* The maximum of the sum of the latencies in every
* connection path that can be drawn between the port and other
* ports with the @ref JackPortIsTerminal flag set.
*/
jack_nframes_t jack_port_get_total_latency (jack_client_t *,
jack_port_t *port);
/**
* The port latency is zero by default. Clients that control
* physical hardware with non-zero latency should call this
* to set the latency to its correct value. Note that the value
* should include any systemic latency present "outside" the
* physical hardware controlled by the client. For example,
* for a client controlling a digital audio interface connected
* to an external digital converter, the latency setting should
* include both buffering by the audio interface *and* the converter.
*/
void jack_port_set_latency (jack_port_t *, jack_nframes_t);
/**
* Modify a port's short name. May be called at any time. If the
* resulting full name (including the @a "client_name:" prefix) is
* longer than jack_port_name_size(), it will be truncated.
*
* @return 0 on success, otherwise a non-zero error code.
*/
int jack_port_set_name (jack_port_t *port, const char *port_name);
/**
* If @ref JackPortCanMonitor is set for this @a port, turn input
* monitoring on or off. Otherwise, do nothing.
*/
int jack_port_request_monitor (jack_port_t *port, int onoff);
/**
* If @ref JackPortCanMonitor is set for this @a port_name, turn input
* monitoring on or off. Otherwise, do nothing.
*
* @return 0 on success, otherwise a non-zero error code.
*
* @see jack_port_name_size()
*/
int jack_port_request_monitor_by_name (jack_client_t *client,
const char *port_name, int onoff);
/**
* If @ref JackPortCanMonitor is set for a port, this function turns
* on input monitoring if it was off, and turns it off if only one
* request has been made to turn it on. Otherwise it does nothing.
*
* @return 0 on success, otherwise a non-zero error code
*/
int jack_port_ensure_monitor (jack_port_t *port, int onoff);
/**
* @return TRUE if input monitoring has been requested for @a port.
*/
int jack_port_monitoring_input (jack_port_t *port);
/**
* Establish a connection between two ports.
*
* When a connection exists, data written to the source port will
* be available to be read at the destination port.
*
* @pre The port types must be identical.
*
* @pre The @ref JackPortFlags of the @a source_port must include @ref
* JackPortIsOutput.
*
* @pre The @ref JackPortFlags of the @a destination_port must include
* @ref JackPortIsInput.
*
* @return 0 on success, EEXIST if the connection is already made,
* otherwise a non-zero error code
*/
int jack_connect (jack_client_t *,
const char *source_port,
const char *destination_port);
/**
* Remove a connection between two ports.
*
* @pre The port types must be identical.
*
* @pre The @ref JackPortFlags of the @a source_port must include @ref
* JackPortIsOutput.
*
* @pre The @ref JackPortFlags of the @a destination_port must include
* @ref JackPortIsInput.
*
* @return 0 on success, otherwise a non-zero error code
*/
int jack_disconnect (jack_client_t *,
const char *source_port,
const char *destination_port);
/**
* Perform the same function as jack_disconnect() using port handles
* rather than names. This avoids the name lookup inherent in the
* name-based version.
*
* Clients connecting their own ports are likely to use this function,
* while generic connection clients (e.g. patchbays) would use
* jack_disconnect().
*/
int jack_port_disconnect (jack_client_t *, jack_port_t *);
/**
* @return the maximum number of characters in a full JACK port name
* including the final NULL character. This value is a constant.
*
* A port's full name contains the owning client name concatenated
* with a colon (:) followed by its short name and a NULL
* character.
*/
int jack_port_name_size(void);
/**
* @return the maximum number of characters in a JACK port type name
* including the final NULL character. This value is a constant.
*/
int jack_port_type_size(void);
/**
* @return the sample rate of the jack system, as set by the user when
* jackd was started.
*/
jack_nframes_t jack_get_sample_rate (jack_client_t *);
/**
* @return the current maximum size that will ever be passed to the @a
* process_callback. It should only be used *before* the client has
* been activated. This size may change, clients that depend on it
* must register a @a bufsize_callback so they will be notified if it
* does.
*
* @see jack_set_buffer_size_callback()
*/
jack_nframes_t jack_get_buffer_size (jack_client_t *);
/**
* @param port_name_pattern A regular expression used to select
* ports by name. If NULL or of zero length, no selection based
* on name will be carried out.
* @param type_name_pattern A regular expression used to select
* ports by type. If NULL or of zero length, no selection based
* on type will be carried out.
* @param flags A value used to select ports by their flags.
* If zero, no selection based on flags will be carried out.
*
* @return a NULL-terminated array of ports that match the specified
* arguments. The caller is responsible for calling free(3) any
* non-NULL returned value.
*
* @see jack_port_name_size(), jack_port_type_size()
*/
const char **jack_get_ports (jack_client_t *,
const char *port_name_pattern,
const char *type_name_pattern,
unsigned long flags);
/**
* @return address of the jack_port_t named @a port_name.
*
* @see jack_port_name_size()
*/
jack_port_t *jack_port_by_name (jack_client_t *, const char *port_name);
/**
* @return address of the jack_port_t of a @a port_id.
*/
jack_port_t *jack_port_by_id (const jack_client_t *client,
jack_port_id_t port_id);
/**
* Old-style interface to become the timebase for the entire JACK
* subsystem.
*
* @deprecated This function still exists for compatibility with the
* earlier transport interface, but it does nothing. Instead, see
* transport.h and use jack_set_timebase_callback().
*
* @return ENOSYS, function not implemented.
*/
int jack_engine_takeover_timebase (jack_client_t *);
/**
* @return the time in frames that has passed since the JACK server
* began the current process cycle.
*/
jack_nframes_t jack_frames_since_cycle_start (const jack_client_t *);
/**
* @return an estimate of the current time in frames. This is a
* running counter, no significance should be attached to its value,
* but it can be compared to a previously returned value.
*/
jack_nframes_t jack_frame_time (const jack_client_t *);
/**
* @return the frame_time after the last processing of the graph
* this is only to be used from the process callback.
*
* This function can be used to put timestamps generated by
* jack_frame_time() in correlation to the current process cycle.
*/
jack_nframes_t jack_last_frame_time (const jack_client_t *client);
/**
* @return the current CPU load estimated by JACK. This is a running
* average of the time it takes to execute a full process cycle for
* all clients as a percentage of the real time available per cycle
* determined by the buffer size and sample rate.
*/
float jack_cpu_load (jack_client_t *client);
/**
* Set the directory in which the server is expected
* to have put its communication FIFOs. A client
* will need to call this before calling
* jack_client_new() if the server was started
* with arguments telling it to use a non-standard
* directory.
*
* @deprecated This function is deprecated. Don't use in new programs
* and remove it in old programs.
*/
void jack_set_server_dir (const char *path);
/**
* @return the pthread ID of the thread running the JACK client side
* code.
*/
pthread_t jack_client_thread_id (jack_client_t *);
/**
* Display JACK error message.
*
* Set via jack_set_error_function(), otherwise a JACK-provided
* default will print @a msg (plus a newline) to stderr.
*
* @param msg error message text (no newline at end).
*/
extern void (*jack_error_callback)(const char *msg);
/**
* Set the @ref jack_error_callback for error message display.
*
* The JACK library provides two built-in callbacks for this purpose:
* default_jack_error_callback() and silent_jack_error_callback().
*/
void jack_set_error_function (void (*func)(const char *));
#ifdef __cplusplus
}
#endif
#endif /* __jack_h__ */