code.delx.au - pulseaudio/blob - src/pulse/scache.h

   1 #ifndef fooscachehfoo
   2 #define fooscachehfoo
   3
   4 /* $Id$ */
   5
   6 /***
   7   This file is part of PulseAudio.
   8
   9   Copyright 2004-2006 Lennart Poettering
  10   Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
  11
  12   PulseAudio is free software; you can redistribute it and/or modify
  13   it under the terms of the GNU Lesser General Public License as published
  14   by the Free Software Foundation; either version 2 of the License,
  15   or (at your option) any later version.
  16
  17   PulseAudio is distributed in the hope that it will be useful, but
  18   WITHOUT ANY WARRANTY; without even the implied warranty of
  19   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  20   General Public License for more details.
  21
  22   You should have received a copy of the GNU Lesser General Public License
  23   along with PulseAudio; if not, write to the Free Software
  24   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  25   USA.
  26 ***/
  27
  28 #include <sys/types.h>
  29
  30 #include <pulse/context.h>
  31 #include <pulse/stream.h>
  32 #include <pulse/cdecl.h>
  33
  34 /** \page scache Sample Cache
  35  *
  36  * \section overv_sec Overview
  37  *
  38  * The sample cache provides a simple way of overcoming high network latencies
  39  * and reducing bandwidth. Instead of streaming a sound precisely when it
  40  * should be played, it is stored on the server and only the command to start
  41  * playing it needs to be sent.
  42  *
  43  * \section create_sec Creation
  44  *
  45  * To create a sample, the normal stream API is used (see \ref streams). The
  46  * function pa_stream_connect_upload() will make sure the stream is stored as
  47  * a sample on the server.
  48  *
  49  * To complete the upload, pa_stream_finish_upload() is called and the sample
  50  * will receive the same name as the stream. If the upload should be aborted,
  51  * simply call pa_stream_disconnect().
  52  *
  53  * \section play_sec Playing samples
  54  *
  55  * To play back a sample, simply call pa_context_play_sample():
  56  *
  57  * \code
  58  * pa_operation *o;
  59  *
  60  * o = pa_context_play_sample(my_context,
  61  *                            "sample2",       // Name of my sample
  62  *                            NULL,            // Use default sink
  63  *                            PA_VOLUME_NORM,  // Full volume
  64  *                            NULL,            // Don't need a callback
  65  *                            NULL
  66  *                            );
  67  * if (o)
  68  *     pa_operation_unref(o);
  69  * \endcode
  70  *
  71  * \section rem_sec Removing samples
  72  *
  73  * When a sample is no longer needed, it should be removed on the server to
  74  * save resources. The sample is deleted using pa_context_remove_sample().
  75  */
  76
  77 /** \file
  78  * All sample cache related routines */
  79
  80 PA_C_DECL_BEGIN
  81
  82 /** Callback prototype for pa_context_play_sample_with_proplist(). The
  83  * idx value is the index of the sink input object, or
  84  * PA_INVALID_INDEX on failure. \since 0.9.11 */
  85 typedef void (*pa_context_play_sample_cb_t)(pa_context *c, uint32_t idx, void *userdata);
  86
  87 /** Make this stream a sample upload stream */
  88 int pa_stream_connect_upload(pa_stream *s, size_t length);
  89
  90 /** Finish the sample upload, the stream name will become the sample
  91  * name. You cancel a sample upload by issuing
  92  * pa_stream_disconnect() */
  93 int pa_stream_finish_upload(pa_stream *s);
  94
  95 /** Remove a sample from the sample cache. Returns an operation object which may be used to cancel the operation while it is running */
  96 pa_operation* pa_context_remove_sample(pa_context *c, const char *name, pa_context_success_cb_t cb, void *userdata);
  97
  98 /** Play a sample from the sample cache to the specified device. If
  99  * the latter is NULL use the default sink. Returns an operation
 100  * object */
 101 pa_operation* pa_context_play_sample(
 102         pa_context *c               /**< Context */,
 103         const char *name            /**< Name of the sample to play */,
 104         const char *dev             /**< Sink to play this sample on */,
 105         pa_volume_t volume          /**< Volume to play this sample with */ ,
 106         pa_context_success_cb_t cb  /**< Call this function after successfully starting playback, or NULL */,
 107         void *userdata              /**< Userdata to pass to the callback */);
 108
 109 /** Play a sample from the sample cache to the specified device,
 110  * allowing specification of a property list for the playback
 111  * stream. If the latter is NULL use the default sink. Returns an
 112  * operation object. \since 0.9.11 */
 113 pa_operation* pa_context_play_sample_with_proplist(
 114         pa_context *c                   /**< Context */,
 115         const char *name                /**< Name of the sample to play */,
 116         const char *dev                 /**< Sink to play this sample on */,
 117         pa_volume_t volume              /**< Volume to play this sample with */ ,
 118         pa_proplist *proplist           /**< Property list for this sound. The property list of the cached entry will be merged into this property list */,
 119         pa_context_play_sample_cb_t cb  /**< Call this function after successfully starting playback, or NULL */,
 120         void *userdata                  /**< Userdata to pass to the callback */);
 121
 122 PA_C_DECL_END
 123
 124 #endif