5 This file is part of PulseAudio.
7 Copyright 2004-2006 Lennart Poettering
8 Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
10 PulseAudio is free software; you can redistribute it and/or modify
11 it under the terms of the GNU Lesser General Public License as published
12 by the Free Software Foundation; either version 2.1 of the License,
13 or (at your option) any later version.
15 PulseAudio is distributed in the hope that it will be useful, but
16 WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 General Public License for more details.
20 You should have received a copy of the GNU Lesser General Public License
21 along with PulseAudio; if not, write to the Free Software
22 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
26 #include <sys/types.h>
28 #include <pulse/sample.h>
29 #include <pulse/channelmap.h>
30 #include <pulse/def.h>
31 #include <pulse/cdecl.h>
32 #include <pulse/version.h>
34 #include <pulse/proplist.h>
35 /** \page simple Simple API
37 * \section overv_sec Overview
39 * The simple API is designed for applications with very basic sound
40 * playback or capture needs. It can only support a single stream per
41 * connection and has no support for handling of complex features like
42 * events, channel mappings and volume control. It is, however, very simple
43 * to use and quite sufficient for many programs.
45 * \section conn_sec Connecting
47 * The first step before using the sound system is to connect to the
48 * server. This is normally done this way:
54 * ss.format = PA_SAMPLE_S16NE;
58 * s = pa_simple_new(NULL, // Use the default server.
59 * "Fooapp", // Our application's name.
61 * NULL, // Use the default device.
62 * "Music", // Description of our stream.
63 * &ss, // Our sample format.
64 * NULL, // Use default channel map
65 * NULL, // Use default buffering attributes.
66 * NULL, // Ignore error code.
70 * At this point a connected object is returned, or NULL if there was a
73 * \section transfer_sec Transferring data
75 * Once the connection is established to the server, data can start flowing.
76 * Using the connection is very similar to the normal read() and write()
77 * system calls. The main difference is that they're called pa_simple_read()
78 * and pa_simple_write(). Note that these operations always block.
80 * \section ctrl_sec Buffer control
82 * \li pa_simple_get_latency() - Will return the total latency of
83 * the playback or record pipeline, respectively.
84 * \li pa_simple_flush() - Will throw away all data currently in buffers.
86 * If a playback stream is used then the following operation is available:
88 * \li pa_simple_drain() - Will wait for all sent data to finish playing.
90 * \section cleanup_sec Cleanup
92 * Once playback or capture is complete, the connection should be closed
93 * and resources freed. This is done through:
101 * A simple but limited synchronous playback and recording
102 * API. This is a synchronous, simplified wrapper around the standard
105 * See also \subpage simple
108 /** \example pacat-simple.c
109 * A simple playback tool using the simple API */
111 /** \example parec-simple.c
112 * A simple recording tool using the simple API */
116 /** \struct pa_simple
117 * An opaque simple connection object */
118 typedef struct pa_simple pa_simple;
120 /** Create a new connection to the server. */
121 pa_simple* pa_simple_new(
122 const char *server, /**< Server name, or NULL for default */
123 const char *name, /**< A descriptive name for this client (application name, ...) */
124 pa_stream_direction_t dir, /**< Open this stream for recording or playback? */
125 const char *dev, /**< Sink (resp. source) name, or NULL for default */
126 const char *stream_name, /**< A descriptive name for this stream (application name, song title, ...) */
127 const pa_sample_spec *ss, /**< The sample type to use */
128 const pa_channel_map *map, /**< The channel map to use, or NULL for default */
129 const pa_buffer_attr *attr, /**< Buffering attributes, or NULL for default */
130 int *error /**< A pointer where the error code is stored when the routine returns NULL. It is OK to pass NULL here. */
133 /** Create a new connection to the server with proplist */
134 pa_simple* pa_simple_new_proplist(
135 const char *server, /**< Server name, or NULL for default */
136 const char *name, /**< A descriptive name for this client (application name, ...) */
137 pa_stream_direction_t dir, /**< Open this stream for recording or playback? */
138 const char *dev, /**< Sink (resp. source) name, or NULL for default */
139 const char *stream_name, /**< A descriptive name for this client (application name, song title, ...) */
140 const pa_sample_spec *ss, /**< The sample type to use */
141 const pa_channel_map *map, /**< The channel map to use, or NULL for default */
142 const pa_buffer_attr *attr, /**< Buffering attributes, or NULL for default */
143 pa_proplist *proplist, /**< Properties, or NULL for default */
144 int *error /**< A pointer where the error code is stored when the routine returns NULL. It is OK to pass NULL here. */
146 /** Close and free the connection to the server. The connection object becomes invalid when this is called. */
147 void pa_simple_free(pa_simple *s);
149 /** Write some data to the server. */
150 int pa_simple_write(pa_simple *s, const void *data, size_t bytes, int *error);
152 /** Wait until all data already written is played by the daemon. */
153 int pa_simple_drain(pa_simple *s, int *error);
155 /** Read some data from the server. This function blocks until \a bytes amount
156 * of data has been received from the server, or until an error occurs.
157 * Returns a negative value on failure. */
159 pa_simple *s, /**< The connection object. */
160 void *data, /**< A pointer to a buffer. */
161 size_t bytes, /**< The number of bytes to read. */
163 /**< A pointer where the error code is stored when the function returns
164 * a negative value. It is OK to pass NULL here. */
167 /** Return the playback or record latency. */
168 pa_usec_t pa_simple_get_latency(pa_simple *s, int *error);
170 /** Flush the playback or record buffer. This discards any audio in the buffer. */
171 int pa_simple_flush(pa_simple *s, int *error);
173 /** Get stream index */
174 int pa_simple_get_stream_index(pa_simple *p, unsigned int *idx, int *rerror);