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348738751c
git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@173 fefdeb5f-60dc-0310-8127-8f9354f1896f
103 lines
4.1 KiB
C
103 lines
4.1 KiB
C
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#ifndef foopolyplibcontexthfoo
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#define foopolyplibcontexthfoo
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/* $Id$ */
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/***
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This file is part of polypaudio.
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polypaudio is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published
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by the Free Software Foundation; either version 2 of the License,
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or (at your option) any later version.
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polypaudio is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with polypaudio; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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USA.
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***/
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#include "sample.h"
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#include "polyplib-def.h"
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#include "mainloop-api.h"
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#include "cdecl.h"
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#include "polyplib-operation.h"
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/** \file
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* Connection contexts for asynchrononous communication with a
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* server. A pa_context object wraps a connection to a polypaudio
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* server using its native protocol. A context may be used to issue
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* commands on the server or to create playback or recording
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* streams. Multiple playback streams may be piped through a single
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* connection context. Operations on the contect involving
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* communication with the server are executed asynchronously: i.e. the
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* client function do not implicitely wait for completion of the
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* operation on the server. Instead the caller specifies a call back
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* function that is called when the operation is completed. Currently
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* running operations may be canceled using pa_operation_cancel(). */
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/** \example pacat.c
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* A playback and recording tool using the asynchronous API */
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PA_C_DECL_BEGIN
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/** \struct pa_context
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* An opaque connection context to a daemon */
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struct pa_context;
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/** Instantiate a new connection context with an abstract mainloop API
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* and an application name */
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struct pa_context *pa_context_new(struct pa_mainloop_api *mainloop, const char *name);
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/** Decrease the reference counter of the context by one */
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void pa_context_unref(struct pa_context *c);
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/** Increase the reference counter of the context by one */
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struct pa_context* pa_context_ref(struct pa_context *c);
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/** Set a callback function that is called whenever the context status changes */
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void pa_context_set_state_callback(struct pa_context *c, void (*cb)(struct pa_context *c, void *userdata), void *userdata);
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/** Return the error number of the last failed operation */
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int pa_context_errno(struct pa_context *c);
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/** Return non-zero if some data is pending to be written to the connection */
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int pa_context_is_pending(struct pa_context *c);
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/** Return the current context status */
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enum pa_context_state pa_context_get_state(struct pa_context *c);
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/** Connect the context to the specified server. If server is NULL,
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connect to the default server. This routine may but will not always
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return synchronously on error. Use pa_context_set_state_callback() to
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be notified when the connection is established */
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int pa_context_connect(struct pa_context *c, const char *server);
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/** Connect the context to a server. If the default server is local
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* but not accessible, spawn a new daemon. If atfork is not NULL it is
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* run after the fork() in the child process. It may be used to close
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* file descriptors or to do any other cleanups. Make sure that
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* SIGCHLD is handled when calling this function. The function will
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* waitpid() on the daemon's PID. \since 0.4 */
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int pa_context_connect_spawn(struct pa_context *c, void (*atfork)(void));
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/** Terminate the context connection immediately */
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void pa_context_disconnect(struct pa_context *c);
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/** Drain the context. If there is nothing to drain, the function returns NULL */
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struct pa_operation* pa_context_drain(struct pa_context *c, void (*cb) (struct pa_context*c, void *userdata), void *userdata);
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/** Tell the daemon to exit. No operation object is returned as the
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* connection is terminated when the daemon quits, thus this operation
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* would never complete. */
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void pa_context_exit_daemon(struct pa_context *c);
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PA_C_DECL_END
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#endif
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