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

   1 #ifndef fooscachehfoo
   2 #define fooscachehfoo
   3
   4 /***
   5   This file is part of PulseAudio.
   6
   7   Copyright 2004-2006 Lennart Poettering
   8   Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
   9
  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 of the License,
  13   or (at your option) any later version.
  14
  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.
  19
  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
  23   USA.
  24 ***/
  25
  26 #include <sys/types.h>
  27
  28 #include <pulse/context.h>
  29 #include <pulse/stream.h>
  30 #include <pulse/cdecl.h>
  31 #include <pulse/version.h>
  32
  33 /** \page scache Sample Cache
  34  *
  35  * \section overv_sec Overview
  36  *
  37  * The sample cache provides a simple way of overcoming high network latencies
  38  * and reducing bandwidth. Instead of streaming a sound precisely when it
  39  * should be played, it is stored on the server and only the command to start
  40  * playing it needs to be sent.
  41  *
  42  * \section create_sec Creation
  43  *
  44  * To create a sample, the normal stream API is used (see \ref streams). The
  45  * function pa_stream_connect_upload() will make sure the stream is stored as
  46  * a sample on the server.
  47  *
  48  * To complete the upload, pa_stream_finish_upload() is called and the sample
  49  * will receive the same name as the stream. If the upload should be aborted,
  50  * simply call pa_stream_disconnect().
  51  *
  52  * \section play_sec Playing samples
  53  *
  54  * To play back a sample, simply call pa_context_play_sample():
  55  *
  56  * \code
  57  * pa_operation *o;
  58  *
  59  * o = pa_context_play_sample(my_context,
  60  *                            "sample2",       // Name of my sample
  61  *                            NULL,            // Use default sink
  62  *                            PA_VOLUME_NORM,  // Full volume
  63  *                            NULL,            // Don't need a callback
  64  *                            NULL
  65  *                            );
  66  * if (o)
  67  *     pa_operation_unref(o);
  68  * \endcode
  69  *
  70  * \section rem_sec Removing samples
  71  *
  72  * When a sample is no longer needed, it should be removed on the server to
  73  * save resources. The sample is deleted using pa_context_remove_sample().
  74  */
  75
  76 /** \file
  77  * All sample cache related routines */
  78
  79 PA_C_DECL_BEGIN
  80
  81 /** Callback prototype for pa_context_play_sample_with_proplist(). The
  82  * idx value is the index of the sink input object, or
  83  * PA_INVALID_INDEX on failure. \since 0.9.11 */
  84 typedef void (*pa_context_play_sample_cb_t)(pa_context *c, uint32_t idx, void *userdata);
  85
  86 /** Make this stream a sample upload stream */
  87 int pa_stream_connect_upload(pa_stream *s, size_t length);
  88
  89 /** Finish the sample upload, the stream name will become the sample
  90  * name. You cancel a sample upload by issuing
  91  * pa_stream_disconnect() */
  92 int pa_stream_finish_upload(pa_stream *s);
  93
  94 /** Remove a sample from the sample cache. Returns an operation object which may be used to cancel the operation while it is running */
  95 pa_operation* pa_context_remove_sample(pa_context *c, const char *name, pa_context_success_cb_t cb, void *userdata);
  96
  97 /** Play a sample from the sample cache to the specified device. If
  98  * the latter is NULL use the default sink. Returns an operation
  99  * object */
 100 pa_operation* pa_context_play_sample(
 101         pa_context *c               /**< Context */,
 102         const char *name            /**< Name of the sample to play */,
 103         const char *dev             /**< Sink to play this sample on */,
 104         pa_volume_t volume          /**< Volume to play this sample with. Starting with 0.9.15 you may pass here (pa_volume_t) -1 which will leave the decision about the volume to the server side which is a good idea. */ ,
 105         pa_context_success_cb_t cb  /**< Call this function after successfully starting playback, or NULL */,
 106         void *userdata              /**< Userdata to pass to the callback */);
 107
 108 /** Play a sample from the sample cache to the specified device,
 109  * allowing specification of a property list for the playback
 110  * stream. If the latter is NULL use the default sink. Returns an
 111  * operation object. \since 0.9.11 */
 112 pa_operation* pa_context_play_sample_with_proplist(
 113         pa_context *c                   /**< Context */,
 114         const char *name                /**< Name of the sample to play */,
 115         const char *dev                 /**< Sink to play this sample on */,
 116         pa_volume_t volume              /**< Volume to play this sample with. Starting with 0.9.15 you may pass here (pa_volume_t) -1 which will leave the decision about the volume to the server side which is a good idea.  */ ,
 117         pa_proplist *proplist           /**< Property list for this sound. The property list of the cached entry will be merged into this property list */,
 118         pa_context_play_sample_cb_t cb  /**< Call this function after successfully starting playback, or NULL */,
 119         void *userdata                  /**< Userdata to pass to the callback */);
 120
 121 PA_C_DECL_END
 122
 123 #endif