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

   1 #ifndef foodefhfoo
   2 #define foodefhfoo
   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
  12   published by the Free Software Foundation; either version 2.1 of the
  13   License, 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   Lesser General Public License for more details.
  19
  20   You should have received a copy of the GNU Lesser General Public
  21   License 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 <inttypes.h>
  27 #include <sys/time.h>
  28 #include <time.h>
  29
  30 #include <pulse/cdecl.h>
  31 #include <pulse/sample.h>
  32
  33 /** \file
  34  * Global definitions */
  35
  36 PA_C_DECL_BEGIN
  37
  38 /** The state of a connection context */
  39 typedef enum pa_context_state {
  40     PA_CONTEXT_UNCONNECTED,    /**< The context hasn't been connected yet */
  41     PA_CONTEXT_CONNECTING,     /**< A connection is being established */
  42     PA_CONTEXT_AUTHORIZING,    /**< The client is authorizing itself to the daemon */
  43     PA_CONTEXT_SETTING_NAME,   /**< The client is passing its application name to the daemon */
  44     PA_CONTEXT_READY,          /**< The connection is established, the context is ready to execute operations */
  45     PA_CONTEXT_FAILED,         /**< The connection failed or was disconnected */
  46     PA_CONTEXT_TERMINATED      /**< The connection was terminated cleanly */
  47 } pa_context_state_t;
  48
  49 /** Return non-zero if the passed state is one of the connected states */
  50 static inline int PA_CONTEXT_IS_GOOD(pa_context_state_t x) {
  51     return
  52         x == PA_CONTEXT_CONNECTING ||
  53         x == PA_CONTEXT_AUTHORIZING ||
  54         x == PA_CONTEXT_SETTING_NAME ||
  55         x == PA_CONTEXT_READY;
  56 }
  57
  58 /** The state of a stream */
  59 typedef enum pa_stream_state {
  60     PA_STREAM_UNCONNECTED, /**< The stream is not yet connected to any sink or source */
  61     PA_STREAM_CREATING,     /**< The stream is being created */
  62     PA_STREAM_READY,        /**< The stream is established, you may pass audio data to it now */
  63     PA_STREAM_FAILED,       /**< An error occured that made the stream invalid */
  64     PA_STREAM_TERMINATED    /**< The stream has been terminated cleanly */
  65 } pa_stream_state_t;
  66
  67 /** Return non-zero if the passed state is one of the connected states */
  68 static inline int PA_STREAM_IS_GOOD(pa_stream_state_t x) {
  69     return
  70         x == PA_STREAM_CREATING ||
  71         x == PA_STREAM_READY;
  72 }
  73
  74 /** The state of an operation */
  75 typedef enum pa_operation_state {
  76     PA_OPERATION_RUNNING,      /**< The operation is still running */
  77     PA_OPERATION_DONE,         /**< The operation has been completed */
  78     PA_OPERATION_CANCELED      /**< The operation has been canceled */
  79 } pa_operation_state_t;
  80
  81 /** An invalid index */
  82 #define PA_INVALID_INDEX ((uint32_t) -1)
  83
  84 /** Some special flags for contexts. */
  85 typedef enum pa_context_flags {
  86     PA_CONTEXT_NOAUTOSPAWN = 1 /**< Disabled autospawning of the PulseAudio daemon if required */
  87 } pa_context_flags_t;
  88
  89 /** The direction of a pa_stream object */
  90 typedef enum pa_stream_direction {
  91     PA_STREAM_NODIRECTION,   /**< Invalid direction */
  92     PA_STREAM_PLAYBACK,      /**< Playback stream */
  93     PA_STREAM_RECORD,        /**< Record stream */
  94     PA_STREAM_UPLOAD         /**< Sample upload stream */
  95 } pa_stream_direction_t;
  96
  97 /** Some special flags for stream connections. */
  98 typedef enum pa_stream_flags {
  99     PA_STREAM_START_CORKED = 1,       /**< Create the stream corked, requiring an explicit pa_stream_cork() call to uncork it. */
 100     PA_STREAM_INTERPOLATE_TIMING = 2, /**< Interpolate the latency for
 101                                        * this stream. When enabled,
 102                                        * pa_stream_get_latency() and
 103                                        * pa_stream_get_time() will try
 104                                        * to estimate the current
 105                                        * record/playback time based on
 106                                        * the local time that passed
 107                                        * since the last timing info
 108                                        * update.  Using this option
 109                                        * has the advantage of not
 110                                        * requiring a whole roundtrip
 111                                        * when the current
 112                                        * playback/recording time is
 113                                        * needed. Consider using this
 114                                        * option when requesting
 115                                        * latency information
 116                                        * frequently. This is
 117                                        * especially useful on long
 118                                        * latency network
 119                                        * connections. It makes a lot
 120                                        * of sense to combine this
 121                                        * option with
 122                                        * PA_STREAM_AUTO_TIMING_UPDATE. */
 123     PA_STREAM_NOT_MONOTONIC = 4,    /**< Don't force the time to
 124                                       * increase monotonically. If
 125                                       * this option is enabled,
 126                                       * pa_stream_get_time() will not
 127                                       * necessarily return always
 128                                       * monotonically increasing time
 129                                       * values on each call. This may
 130                                       * confuse applications which
 131                                       * cannot deal with time going
 132                                       * 'backwards', but has the
 133                                       * advantage that bad transport
 134                                       * latency estimations that
 135                                       * caused the time to to jump
 136                                       * ahead can be corrected
 137                                       * quickly, without the need to
 138                                       * wait. (Please note that this
 139                                       * flag was named
 140                                       * PA_STREAM_NOT_MONOTONOUS in
 141                                       * releases prior to 0.9.11. The
 142                                       * old name is still defined too,
 143                                       * for compatibility reasons. */
 144     PA_STREAM_AUTO_TIMING_UPDATE = 8, /**< If set timing update requests
 145                                        * are issued periodically
 146                                        * automatically. Combined with
 147                                        * PA_STREAM_INTERPOLATE_TIMING
 148                                        * you will be able to query the
 149                                        * current time and latency with
 150                                        * pa_stream_get_time() and
 151                                        * pa_stream_get_latency() at
 152                                        * all times without a packet
 153                                        * round trip.*/
 154     PA_STREAM_NO_REMAP_CHANNELS = 16, /**< Don't remap channels by
 155                                        * their name, instead map them
 156                                        * simply by their
 157                                        * index. Implies
 158                                        * PA_STREAM_NO_REMIX_CHANNELS. Only
 159                                        * supported when the server is
 160                                        * at least PA 0.9.8. It is
 161                                        * ignored on older
 162                                        * servers.\since 0.9.8 */
 163     PA_STREAM_NO_REMIX_CHANNELS = 32, /**< When remapping channels by
 164                                        * name, don't upmix or downmix
 165                                        * them to related
 166                                        * channels. Copy them into
 167                                        * matching channels of the
 168                                        * device 1:1. Only supported
 169                                        * when the server is at least
 170                                        * PA 0.9.8. It is ignored on
 171                                        * older servers. \since
 172                                        * 0.9.8 */
 173     PA_STREAM_FIX_FORMAT = 64, /**< Use the sample format of the
 174                                 * sink/device this stream is being
 175                                 * connected to, and possibly ignore
 176                                 * the format the sample spec contains
 177                                 * -- but you still have to pass a
 178                                 * valid value in it as a hint to
 179                                 * PulseAudio what would suit your
 180                                 * stream best. If this is used you
 181                                 * should query the used sample format
 182                                 * after creating the stream by using
 183                                 * pa_stream_get_sample_spec(). Also,
 184                                 * if you specified manual buffer
 185                                 * metrics it is recommended to update
 186                                 * them with
 187                                 * pa_stream_set_buffer_attr() to
 188                                 * compensate for the changed frame
 189                                 * sizes. Only supported when the
 190                                 * server is at least PA 0.9.8. It is
 191                                 * ignored on older servers. \since
 192                                 * 0.9.8 */
 193
 194     PA_STREAM_FIX_RATE = 128, /**< Use the sample rate of the sink,
 195                                * and possibly ignore the rate the
 196                                * sample spec contains. Usage similar
 197                                * to PA_STREAM_FIX_FORMAT.Only
 198                                * supported when the server is at least
 199                                * PA 0.9.8. It is ignored on older
 200                                * servers. \since 0.9.8 */
 201
 202     PA_STREAM_FIX_CHANNELS = 256, /**< Use the number of channels and
 203                                * the channel map of the sink, and
 204                                * possibly ignore the number of
 205                                * channels and the map the sample spec
 206                                * and the passed channel map
 207                                * contains. Usage similar to
 208                                * PA_STREAM_FIX_FORMAT. Only supported
 209                                * when the server is at least PA
 210                                * 0.9.8. It is ignored on older
 211                                * servers. \since 0.9.8 */
 212     PA_STREAM_DONT_MOVE = 512, /**< Don't allow moving of this stream to
 213                               * another sink/device. Useful if you use
 214                               * any of the PA_STREAM_FIX_ flags and
 215                               * want to make sure that resampling
 216                               * never takes place -- which might
 217                               * happen if the stream is moved to
 218                               * another sink/source whith a different
 219                               * sample spec/channel map. Only
 220                               * supported when the server is at least
 221                               * PA 0.9.8. It is ignored on older
 222                               * servers. \since 0.9.8 */
 223     PA_STREAM_VARIABLE_RATE = 1024, /**< Allow dynamic changing of the
 224                                      * sampling rate during playback
 225                                      * with
 226                                      * pa_stream_update_sample_rate(). Only
 227                                      * supported when the server is at
 228                                      * least PA 0.9.8. It is ignored
 229                                      * on older servers. \since
 230                                      * 0.9.8 */
 231     PA_STREAM_PEAK_DETECT = 2048, /**< Find peaks instead of
 232                                    * resampling. \since 0.9.11 */
 233
 234     PA_STREAM_START_MUTED = 4096,  /**< Create in muted state. \since 0.9.11 */
 235
 236
 237     PA_STREAM_ADJUST_LATENCY = 8192, /**< Try to adjust the latency of
 238                                       * the sink/source based on the
 239                                       * requested buffer metrics and
 240                                       * adjust buffer metrics
 241                                       * accordingly. \since 0.9.11 */
 242 } pa_stream_flags_t;
 243
 244
 245 /** English is an evil language */
 246 #define PA_STREAM_NOT_MONOTONOUS PA_STREAM_NOT_MONOTONIC
 247
 248 /** Playback and record buffer metrics */
 249 typedef struct pa_buffer_attr {
 250     uint32_t maxlength;      /**< Maximum length of the
 251                               * buffer. Setting this to 0 will
 252                               * initialize this to the maximum value
 253                               * supported by server, which is
 254                               * recommended. */
 255     uint32_t tlength;        /**< Playback only: target length of the
 256                               * buffer. The server tries to assure
 257                               * that at least tlength bytes are always
 258                               * available in the buffer. It is
 259                               * recommended to set this to 0, which
 260                               * will initialize this to a value that
 261                               * is deemed sensible by the
 262                               * server. However, this value will
 263                               * default to something like 2s, i.e. for
 264                               * applications that have specific
 265                               * latency requirements this value should
 266                               * be set to the maximum latency that the
 267                               * application can deal with.  */
 268     uint32_t prebuf;         /**< Playback only: pre-buffering. The
 269                               * server does not start with playback
 270                               * before at least prebug bytes are
 271                               * available in the buffer. It is
 272                               * recommended to set this to 0, which
 273                               * will initialize this to the same value
 274                               * as tlength, whatever that may be. */
 275     uint32_t minreq;         /**< Playback only: minimum request. The
 276                               * server does not request less than
 277                               * minreq bytes from the client, instead
 278                               * waits until the buffer is free enough
 279                               * to request more bytes at once. It is
 280                               * recommended to set this to 0, which
 281                               * will initialize this to a value that
 282                               * is deemed sensible by the server. */
 283     uint32_t fragsize;       /**< Recording only: fragment size. The
 284                               * server sends data in blocks of
 285                               * fragsize bytes size. Large values
 286                               * deminish interactivity with other
 287                               * operations on the connection context
 288                               * but decrease control overhead. It is
 289                               * recommended to set this to 0, which
 290                               * will initialize this to a value that
 291                               * is deemed sensible by the
 292                               * server. However, this value will
 293                               * default to something like 2s, i.e. for
 294                               * applications that have specific
 295                               * latency requirements this value should
 296                               * be set to the maximum latency that the
 297                               * application can deal with. */
 298 } pa_buffer_attr;
 299
 300 /** Error values as used by pa_context_errno(). Use pa_strerror() to convert these values to human readable strings */
 301 enum {
 302     PA_OK = 0,                     /**< No error */
 303     PA_ERR_ACCESS,                 /**< Access failure */
 304     PA_ERR_COMMAND,                /**< Unknown command */
 305     PA_ERR_INVALID,                /**< Invalid argument */
 306     PA_ERR_EXIST,                  /**< Entity exists */
 307     PA_ERR_NOENTITY,               /**< No such entity */
 308     PA_ERR_CONNECTIONREFUSED,      /**< Connection refused */
 309     PA_ERR_PROTOCOL,               /**< Protocol error */
 310     PA_ERR_TIMEOUT,                /**< Timeout */
 311     PA_ERR_AUTHKEY,                /**< No authorization key */
 312     PA_ERR_INTERNAL,               /**< Internal error */
 313     PA_ERR_CONNECTIONTERMINATED,   /**< Connection terminated */
 314     PA_ERR_KILLED,                 /**< Entity killed */
 315     PA_ERR_INVALIDSERVER,          /**< Invalid server */
 316     PA_ERR_MODINITFAILED,          /**< Module initialization failed */
 317     PA_ERR_BADSTATE,               /**< Bad state */
 318     PA_ERR_NODATA,                 /**< No data */
 319     PA_ERR_VERSION,                /**< Incompatible protocol version */
 320     PA_ERR_TOOLARGE,               /**< Data too large */
 321     PA_ERR_NOTSUPPORTED,           /**< Operation not supported \since 0.9.5 */
 322     PA_ERR_UNKNOWN,                /**< The error code was unknown to the client */
 323     PA_ERR_MAX                     /**< Not really an error but the first invalid error code */
 324 };
 325
 326 /** Subscription event mask, as used by pa_context_subscribe() */
 327 typedef enum pa_subscription_mask {
 328     PA_SUBSCRIPTION_MASK_NULL = 0,               /**< No events */
 329     PA_SUBSCRIPTION_MASK_SINK = 1,               /**< Sink events */
 330     PA_SUBSCRIPTION_MASK_SOURCE = 2,             /**< Source events */
 331     PA_SUBSCRIPTION_MASK_SINK_INPUT = 4,         /**< Sink input events */
 332     PA_SUBSCRIPTION_MASK_SOURCE_OUTPUT = 8,      /**< Source output events */
 333     PA_SUBSCRIPTION_MASK_MODULE = 16,            /**< Module events */
 334     PA_SUBSCRIPTION_MASK_CLIENT = 32,            /**< Client events */
 335     PA_SUBSCRIPTION_MASK_SAMPLE_CACHE = 64,      /**< Sample cache events */
 336     PA_SUBSCRIPTION_MASK_SERVER = 128,           /**< Other global server changes. */
 337     PA_SUBSCRIPTION_MASK_AUTOLOAD = 256,         /**< Autoload table events. */
 338     PA_SUBSCRIPTION_MASK_ALL = 511               /**< Catch all events */
 339 } pa_subscription_mask_t;
 340
 341 /** Subscription event types, as used by pa_context_subscribe() */
 342 typedef enum pa_subscription_event_type {
 343     PA_SUBSCRIPTION_EVENT_SINK = 0,           /**< Event type: Sink */
 344     PA_SUBSCRIPTION_EVENT_SOURCE = 1,         /**< Event type: Source */
 345     PA_SUBSCRIPTION_EVENT_SINK_INPUT = 2,     /**< Event type: Sink input */
 346     PA_SUBSCRIPTION_EVENT_SOURCE_OUTPUT = 3,  /**< Event type: Source output */
 347     PA_SUBSCRIPTION_EVENT_MODULE = 4,         /**< Event type: Module */
 348     PA_SUBSCRIPTION_EVENT_CLIENT = 5,         /**< Event type: Client */
 349     PA_SUBSCRIPTION_EVENT_SAMPLE_CACHE = 6,   /**< Event type: Sample cache item */
 350     PA_SUBSCRIPTION_EVENT_SERVER = 7,         /**< Event type: Global server change, only occuring with PA_SUBSCRIPTION_EVENT_CHANGE. */
 351     PA_SUBSCRIPTION_EVENT_AUTOLOAD = 8,       /**< Event type: Autoload table changes. */
 352     PA_SUBSCRIPTION_EVENT_FACILITY_MASK = 15, /**< A mask to extract the event type from an event value */
 353
 354     PA_SUBSCRIPTION_EVENT_NEW = 0,            /**< A new object was created */
 355     PA_SUBSCRIPTION_EVENT_CHANGE = 16,        /**< A property of the object was modified */
 356     PA_SUBSCRIPTION_EVENT_REMOVE = 32,        /**< An object was removed */
 357     PA_SUBSCRIPTION_EVENT_TYPE_MASK = 16+32   /**< A mask to extract the event operation from an event value */
 358 } pa_subscription_event_type_t;
 359
 360 /** Return one if an event type t matches an event mask bitfield */
 361 #define pa_subscription_match_flags(m, t) (!!((m) & (1 << ((t) & PA_SUBSCRIPTION_EVENT_FACILITY_MASK))))
 362
 363 /** A structure for all kinds of timing information of a stream. See
 364  * pa_stream_update_timing_info() and pa_stream_get_timing_info(). The
 365  * total output latency a sample that is written with
 366  * pa_stream_write() takes to be played may be estimated by
 367  * sink_usec+buffer_usec+transport_usec. (where buffer_usec is defined
 368  * as pa_bytes_to_usec(write_index-read_index)) The output buffer
 369  * which buffer_usec relates to may be manipulated freely (with
 370  * pa_stream_write()'s seek argument, pa_stream_flush() and friends),
 371  * the buffers sink_usec and source_usec relate to are first-in
 372  * first-out (FIFO) buffers which cannot be flushed or manipulated in
 373  * any way. The total input latency a sample that is recorded takes to
 374  * be delivered to the application is:
 375  * source_usec+buffer_usec+transport_usec-sink_usec. (Take care of
 376  * sign issues!) When connected to a monitor source sink_usec contains
 377  * the latency of the owning sink. The two latency estimations
 378  * described here are implemented in pa_stream_get_latency(). Please
 379  * note that this structure can be extended as part of evolutionary
 380  * API updates at any time in any new release.*/
 381 typedef struct pa_timing_info {
 382     struct timeval timestamp; /**< The time when this timing info structure was current */
 383     int synchronized_clocks;  /**< Non-zero if the local and the
 384                                * remote machine have synchronized
 385                                * clocks. If synchronized clocks are
 386                                * detected transport_usec becomes much
 387                                * more reliable. However, the code that
 388                                * detects synchronized clocks is very
 389                                * limited und unreliable itself. */
 390
 391     pa_usec_t sink_usec;      /**< Time in usecs a sample takes to be played on the sink. For playback streams and record streams connected to a monitor source. */
 392     pa_usec_t source_usec;    /**< Time in usecs a sample takes from being recorded to being delivered to the application. Only for record streams. */
 393     pa_usec_t transport_usec; /**< Estimated time in usecs a sample takes to be transferred to/from the daemon. For both playback and record streams. */
 394
 395     int playing;              /**< Non-zero when the stream is
 396                                * currently not underrun and data is
 397                                * being passed on to the device. Only
 398                                * for playback streams. This field does
 399                                * not say whether the data is actually
 400                                * already being played. To determine
 401                                * this check whether since_underrun
 402                                * (converted to usec) is larger than
 403                                * sink_usec.*/
 404
 405     int write_index_corrupt;  /**< Non-zero if write_index is not
 406                                * up-to-date because a local write
 407                                * command that corrupted it has been
 408                                * issued in the time since this latency
 409                                * info was current . Only write
 410                                * commands with SEEK_RELATIVE_ON_READ
 411                                * and SEEK_RELATIVE_END can corrupt
 412                                * write_index. */
 413     int64_t write_index;      /**< Current write index into the
 414                                * playback buffer in bytes. Think twice before
 415                                * using this for seeking purposes: it
 416                                * might be out of date a the time you
 417                                * want to use it. Consider using
 418                                * PA_SEEK_RELATIVE instead.  */
 419
 420     int read_index_corrupt;   /**< Non-zero if read_index is not
 421                                * up-to-date because a local pause or
 422                                * flush request that corrupted it has
 423                                * been issued in the time since this
 424                                * latency info was current. */
 425
 426     int64_t read_index;       /**< Current read index into the
 427                                * playback buffer in bytes. Think twice before
 428                                * using this for seeking purposes: it
 429                                * might be out of date a the time you
 430                                * want to use it. Consider using
 431                                * PA_SEEK_RELATIVE_ON_READ
 432                                * instead. */
 433
 434     pa_usec_t configured_sink_usec;   /**< The static configured latency for
 435                                 * the sink. \since 0.9.11 */
 436     pa_usec_t configured_source_usec; /**< The static configured latency for
 437                                 * the source. \since 0.9.11 */
 438
 439     int64_t since_underrun;    /**< Bytes that were handed to the sink
 440                                   since the last underrun happened, or
 441                                   since playback started again after
 442                                   the last underrun. playing will tell
 443                                   you which case it is. \since
 444                                   0.9.11 */
 445
 446 } pa_timing_info;
 447
 448 /** A structure for the spawn api. This may be used to integrate auto
 449  * spawned daemons into your application. For more information see
 450  * pa_context_connect(). When spawning a new child process the
 451  * waitpid() is used on the child's PID. The spawn routine will not
 452  * block or ignore SIGCHLD signals, since this cannot be done in a
 453  * thread compatible way. You might have to do this in
 454  * prefork/postfork. */
 455 typedef struct pa_spawn_api {
 456     void (*prefork)(void);     /**< Is called just before the fork in the parent process. May be NULL. */
 457     void (*postfork)(void);    /**< Is called immediately after the fork in the parent process. May be NULL.*/
 458     void (*atfork)(void);      /**< Is called immediately after the
 459                                 * fork in the child process. May be
 460                                 * NULL. It is not safe to close all
 461                                 * file descriptors in this function
 462                                 * unconditionally, since a UNIX socket
 463                                 * (created using socketpair()) is
 464                                 * passed to the new process. */
 465 } pa_spawn_api;
 466
 467 /** Seek type for pa_stream_write(). */
 468 typedef enum pa_seek_mode {
 469     PA_SEEK_RELATIVE = 0,           /**< Seek relatively to the write index */
 470     PA_SEEK_ABSOLUTE = 1,           /**< Seek relatively to the start of the buffer queue */
 471     PA_SEEK_RELATIVE_ON_READ = 2,   /**< Seek relatively to the read index.  */
 472     PA_SEEK_RELATIVE_END = 3        /**< Seek relatively to the current end of the buffer queue. */
 473 } pa_seek_mode_t;
 474
 475 /** Special sink flags. */
 476 typedef enum pa_sink_flags {
 477     PA_SINK_HW_VOLUME_CTRL = 1,   /**< Supports hardware volume control */
 478     PA_SINK_LATENCY = 2,          /**< Supports latency querying */
 479     PA_SINK_HARDWARE = 4,         /**< Is a hardware sink of some kind, in contrast to "virtual"/software sinks \since 0.9.3 */
 480     PA_SINK_NETWORK = 8,          /**< Is a networked sink of some kind. \since 0.9.7 */
 481     PA_SINK_HW_MUTE_CTRL = 16,    /**< Supports hardware mute control \since 0.9.11 */
 482     PA_SINK_DECIBEL_VOLUME = 32   /**< Volume can be translated to dB with pa_sw_volume_to_dB() \since 0.9.11 */
 483 } pa_sink_flags_t;
 484
 485 /** Special source flags.  */
 486 typedef enum pa_source_flags {
 487     PA_SOURCE_HW_VOLUME_CTRL = 1,  /**< Supports hardware volume control */
 488     PA_SOURCE_LATENCY = 2,         /**< Supports latency querying */
 489     PA_SOURCE_HARDWARE = 4,        /**< Is a hardware source of some kind, in contrast to "virtual"/software source \since 0.9.3 */
 490     PA_SOURCE_NETWORK = 8,         /**< Is a networked sink of some kind. \since 0.9.7 */
 491     PA_SOURCE_HW_MUTE_CTRL = 16,   /**< Supports hardware mute control \since 0.9.11 */
 492     PA_SOURCE_DECIBEL_VOLUME = 32  /**< Volume can be translated to dB with pa_sw_volume_to_dB() \since 0.9.11 */
 493 } pa_source_flags_t;
 494
 495 /** A generic free() like callback prototype */
 496 typedef void (*pa_free_cb_t)(void *p);
 497
 498 PA_C_DECL_END
 499
 500 #endif