159 lines
5.8 KiB
C++
159 lines
5.8 KiB
C++
#ifndef foosimplehfoo
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#define foosimplehfoo
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/***
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This file is part of PulseAudio.
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Copyright 2004-2006 Lennart Poettering
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Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
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PulseAudio is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published
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by the Free Software Foundation; either version 2.1 of the License,
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or (at your option) any later version.
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PulseAudio 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 Lesser General Public License
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along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
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***/
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#include <sys/types.h>
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#include <pulse/sample.h>
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#include <pulse/channelmap.h>
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#include <pulse/def.h>
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#include <pulse/cdecl.h>
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#include <pulse/version.h>
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/** \page simple Simple API
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*
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* \section overv_sec Overview
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*
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* The simple API is designed for applications with very basic sound
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* playback or capture needs. It can only support a single stream per
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* connection and has no support for handling of complex features like
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* events, channel mappings and volume control. It is, however, very simple
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* to use and quite sufficient for many programs.
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*
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* \section conn_sec Connecting
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*
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* The first step before using the sound system is to connect to the
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* server. This is normally done this way:
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*
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* \code
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* pa_simple *s;
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* pa_sample_spec ss;
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*
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* ss.format = PA_SAMPLE_S16NE;
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* ss.channels = 2;
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* ss.rate = 44100;
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*
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* s = pa_simple_new(NULL, // Use the default server.
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* "Fooapp", // Our application's name.
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* PA_STREAM_PLAYBACK,
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* NULL, // Use the default device.
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* "Music", // Description of our stream.
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* &ss, // Our sample format.
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* NULL, // Use default channel map
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* NULL, // Use default buffering attributes.
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* NULL, // Ignore error code.
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* );
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* \endcode
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*
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* At this point a connected object is returned, or NULL if there was a
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* problem connecting.
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*
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* \section transfer_sec Transferring data
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*
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* Once the connection is established to the server, data can start flowing.
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* Using the connection is very similar to the normal read() and write()
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* system calls. The main difference is that they're called pa_simple_read()
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* and pa_simple_write(). Note that these operations always block.
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*
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* \section ctrl_sec Buffer control
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*
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* \li pa_simple_get_latency() - Will return the total latency of
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* the playback or record pipeline, respectively.
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* \li pa_simple_flush() - Will throw away all data currently in buffers.
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*
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* If a playback stream is used then the following operation is available:
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*
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* \li pa_simple_drain() - Will wait for all sent data to finish playing.
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*
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* \section cleanup_sec Cleanup
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*
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* Once playback or capture is complete, the connection should be closed
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* and resources freed. This is done through:
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*
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* \code
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* pa_simple_free(s);
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* \endcode
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*/
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/** \file
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* A simple but limited synchronous playback and recording
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* API. This is a synchronous, simplified wrapper around the standard
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* asynchronous API.
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*
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* See also \subpage simple
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*/
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/** \example pacat-simple.c
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* A simple playback tool using the simple API */
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/** \example parec-simple.c
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* A simple recording tool using the simple API */
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PA_C_DECL_BEGIN
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/** \struct pa_simple
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* An opaque simple connection object */
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typedef struct pa_simple pa_simple;
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/** Create a new connection to the server. */
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pa_simple* pa_simple_new(
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const char *server, /**< Server name, or NULL for default */
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const char *name, /**< A descriptive name for this client (application name, ...) */
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pa_stream_direction_t dir, /**< Open this stream for recording or playback? */
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const char *dev, /**< Sink (resp. source) name, or NULL for default */
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const char *stream_name, /**< A descriptive name for this stream (application name, song title, ...) */
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const pa_sample_spec *ss, /**< The sample type to use */
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const pa_channel_map *map, /**< The channel map to use, or NULL for default */
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const pa_buffer_attr *attr, /**< Buffering attributes, or NULL for default */
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int *error /**< A pointer where the error code is stored when the routine returns NULL. It is OK to pass NULL here. */
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);
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/** Close and free the connection to the server. The connection object becomes invalid when this is called. */
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void pa_simple_free(pa_simple *s);
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/** Write some data to the server. */
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int pa_simple_write(pa_simple *s, const void *data, size_t bytes, int *error);
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/** Wait until all data already written is played by the daemon. */
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int pa_simple_drain(pa_simple *s, int *error);
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/** Read some data from the server. This function blocks until \a bytes amount
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* of data has been received from the server, or until an error occurs.
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* Returns a negative value on failure. */
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int pa_simple_read(
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pa_simple *s, /**< The connection object. */
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void *data, /**< A pointer to a buffer. */
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size_t bytes, /**< The number of bytes to read. */
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int *error
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/**< A pointer where the error code is stored when the function returns
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* a negative value. It is OK to pass NULL here. */
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);
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/** Return the playback or record latency. */
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pa_usec_t pa_simple_get_latency(pa_simple *s, int *error);
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/** Flush the playback or record buffer. This discards any audio in the buffer. */
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int pa_simple_flush(pa_simple *s, int *error);
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PA_C_DECL_END
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#endif
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