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 (at) 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 2.1 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_INVALID 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_INVALID 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 124
