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#ifndef foopolyplibcontexthfoo
#define foopolyplibcontexthfoo
/* $Id$ */
/***
This file is part of polypaudio.
polypaudio is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
by the Free Software Foundation; either version 2 of the License,
or (at your option) any later version.
polypaudio 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
General Public License for more details.
You should have received a copy of the GNU General Public License
along with polypaudio; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA.
***/
#include "sample.h"
#include "polyplib-def.h"
#include "mainloop-api.h"
#include "cdecl.h"
#include "polyplib-operation.h"
/** \file
* Connection contexts for asynchrononous communication with a
* server. A pa_context object wraps a connection to a polypaudio
* server using its native protocol. A context may be used to issue
* commands on the server or to create playback or recording
* streams. Multiple playback streams may be piped through a single
* connection context. Operations on the contect involving
* communication with the server are executed asynchronously: i.e. the
* client function do not implicitely wait for completion of the
* operation on the server. Instead the caller specifies a call back
* function that is called when the operation is completed. Currently
* running operations may be canceled using pa_operation_cancel(). */
/** \example pacat.c
* A playback and recording tool using the asynchronous API */
PA_C_DECL_BEGIN
/** \struct pa_context
* An opaque connection context to a daemon */
struct pa_context;
/** Instantiate a new connection context with an abstract mainloop API
* and an application name */
struct pa_context *pa_context_new(struct pa_mainloop_api *mainloop, const char *name);
/** Decrease the reference counter of the context by one */
void pa_context_unref(struct pa_context *c);
/** Increase the reference counter of the context by one */
struct pa_context* pa_context_ref(struct pa_context *c);
/** Set a callback function that is called whenever the context status changes */
void pa_context_set_state_callback(struct pa_context *c, void (*cb)(struct pa_context *c, void *userdata), void *userdata);
/** Return the error number of the last failed operation */
int pa_context_errno(struct pa_context *c);
/** Return non-zero if some data is pending to be written to the connection */
int pa_context_is_pending(struct pa_context *c);
/** Return the current context status */
enum pa_context_state pa_context_get_state(struct pa_context *c);
/** Connect the context to the specified server. If server is NULL,
connect to the default server. This routine may but will not always
return synchronously on error. Use pa_context_set_state_callback() to
be notified when the connection is established */
int pa_context_connect(struct pa_context *c, const char *server);
/** Connect the context to a server. If the default server is local
* but not accessible, spawn a new daemon. If atfork is not NULL it is
* run after the fork() in the child process. It may be used to close
* file descriptors or to do any other cleanups. (It is not safe to
* close all file descriptors unconditionally, since a UNIX socket is
* passed to the new process.) if prefork is not NULL it is run just
* before forking in the parent process. Use this to block SIGCHLD
* handling if required. If postfork is not NULL it is run just after
* forking in the parent process. Use this to unblock SIGCHLD if
* required. The function will waitpid() on the daemon's PID, but
* will not block or ignore SIGCHLD signals, since this cannot be done
* in a thread compatible way. \since 0.4 */
int pa_context_connect_spawn(struct pa_context *c, void (*atfork)(void), void (*prefork)(void), void (*postfork)(void));
/** Terminate the context connection immediately */
void pa_context_disconnect(struct pa_context *c);
/** Drain the context. If there is nothing to drain, the function returns NULL */
struct pa_operation* pa_context_drain(struct pa_context *c, void (*cb) (struct pa_context*c, void *userdata), void *userdata);
/** Tell the daemon to exit. No operation object is returned as the
* connection is terminated when the daemon quits, thus this operation
* would never complete. */
void pa_context_exit_daemon(struct pa_context *c);
/** Set the name of the default sink. \since 0.4 */
struct pa_operation* pa_context_set_default_sink(struct pa_context *c, const char *name, void(*cb)(struct pa_context*c, int success, void *userdata), void *userdata);
/** Set the name of the default source. \since 0.4 */
struct pa_operation* pa_context_set_default_source(struct pa_context *c, const char *name, void(*cb)(struct pa_context*c, int success, void *userdata), void *userdata);
PA_C_DECL_END
#endif
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