1 /************************************************************************/
3 \brief Realtime audio i/o C++ classes.
5 RtAudio provides a common API (Application Programming Interface)
6 for realtime audio input/output across Linux (native ALSA, Jack,
7 and OSS), Macintosh OS X (CoreAudio and Jack), and Windows
8 (DirectSound, ASIO and WASAPI) operating systems.
10 RtAudio GitHub site: https://github.com/thestk/rtaudio
11 RtAudio WWW site: http://www.music.mcgill.ca/~gary/rtaudio/
13 RtAudio: realtime audio i/o C++ classes
14 Copyright (c) 2001-2019 Gary P. Scavone
16 Permission is hereby granted, free of charge, to any person
17 obtaining a copy of this software and associated documentation files
18 (the "Software"), to deal in the Software without restriction,
19 including without limitation the rights to use, copy, modify, merge,
20 publish, distribute, sublicense, and/or sell copies of the Software,
21 and to permit persons to whom the Software is furnished to do so,
22 subject to the following conditions:
24 The above copyright notice and this permission notice shall be
25 included in all copies or substantial portions of the Software.
27 Any person wishing to distribute modifications to the Software is
28 asked to send the modifications to the original developer so that
29 they can be incorporated into the canonical version. This is,
30 however, not a binding provision of this license.
32 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
33 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
34 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
35 IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
36 ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
37 CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
38 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
40 /************************************************************************/
49 #define RTAUDIO_VERSION "5.1.0"
51 #if defined _WIN32 || defined __CYGWIN__
52 #if defined(RTAUDIO_EXPORT)
53 #define RTAUDIO_DLL_PUBLIC __declspec(dllexport)
55 #define RTAUDIO_DLL_PUBLIC
59 #define RTAUDIO_DLL_PUBLIC __attribute__( (visibility( "default" )) )
61 #define RTAUDIO_DLL_PUBLIC
70 /*! \typedef typedef unsigned long RtAudioFormat;
71 \brief RtAudio data format type.
73 Support for signed integers and floats. Audio data fed to/from an
74 RtAudio stream is assumed to ALWAYS be in host byte order. The
75 internal routines will automatically take care of any necessary
76 byte-swapping between the host format and the soundcard. Thus,
77 endian-ness is not a concern in the following format definitions.
79 - \e RTAUDIO_SINT8: 8-bit signed integer.
80 - \e RTAUDIO_SINT16: 16-bit signed integer.
81 - \e RTAUDIO_SINT24: 24-bit signed integer.
82 - \e RTAUDIO_SINT32: 32-bit signed integer.
83 - \e RTAUDIO_FLOAT32: Normalized between plus/minus 1.0.
84 - \e RTAUDIO_FLOAT64: Normalized between plus/minus 1.0.
86 typedef unsigned long RtAudioFormat;
87 static const RtAudioFormat RTAUDIO_SINT8 = 0x1; // 8-bit signed integer.
88 static const RtAudioFormat RTAUDIO_SINT16 = 0x2; // 16-bit signed integer.
89 static const RtAudioFormat RTAUDIO_SINT24 = 0x4; // 24-bit signed integer.
90 static const RtAudioFormat RTAUDIO_SINT32 = 0x8; // 32-bit signed integer.
91 static const RtAudioFormat RTAUDIO_FLOAT32 = 0x10; // Normalized between plus/minus 1.0.
92 static const RtAudioFormat RTAUDIO_FLOAT64 = 0x20; // Normalized between plus/minus 1.0.
94 /*! \typedef typedef unsigned long RtAudioStreamFlags;
95 \brief RtAudio stream option flags.
97 The following flags can be OR'ed together to allow a client to
98 make changes to the default stream behavior:
100 - \e RTAUDIO_NONINTERLEAVED: Use non-interleaved buffers (default = interleaved).
101 - \e RTAUDIO_MINIMIZE_LATENCY: Attempt to set stream parameters for lowest possible latency.
102 - \e RTAUDIO_HOG_DEVICE: Attempt grab device for exclusive use.
103 - \e RTAUDIO_ALSA_USE_DEFAULT: Use the "default" PCM device (ALSA only).
104 - \e RTAUDIO_JACK_DONT_CONNECT: Do not automatically connect ports (JACK only).
106 By default, RtAudio streams pass and receive audio data from the
107 client in an interleaved format. By passing the
108 RTAUDIO_NONINTERLEAVED flag to the openStream() function, audio
109 data will instead be presented in non-interleaved buffers. In
110 this case, each buffer argument in the RtAudioCallback function
111 will point to a single array of data, with \c nFrames samples for
112 each channel concatenated back-to-back. For example, the first
113 sample of data for the second channel would be located at index \c
114 nFrames (assuming the \c buffer pointer was recast to the correct
115 data type for the stream).
117 Certain audio APIs offer a number of parameters that influence the
118 I/O latency of a stream. By default, RtAudio will attempt to set
119 these parameters internally for robust (glitch-free) performance
120 (though some APIs, like Windows DirectSound, make this difficult).
121 By passing the RTAUDIO_MINIMIZE_LATENCY flag to the openStream()
122 function, internal stream settings will be influenced in an attempt
123 to minimize stream latency, though possibly at the expense of stream
126 If the RTAUDIO_HOG_DEVICE flag is set, RtAudio will attempt to
127 open the input and/or output stream device(s) for exclusive use.
128 Note that this is not possible with all supported audio APIs.
130 If the RTAUDIO_SCHEDULE_REALTIME flag is set, RtAudio will attempt
131 to select realtime scheduling (round-robin) for the callback thread.
133 If the RTAUDIO_ALSA_USE_DEFAULT flag is set, RtAudio will attempt to
134 open the "default" PCM device when using the ALSA API. Note that this
135 will override any specified input or output device id.
137 If the RTAUDIO_JACK_DONT_CONNECT flag is set, RtAudio will not attempt
138 to automatically connect the ports of the client to the audio device.
140 typedef unsigned int RtAudioStreamFlags;
141 static const RtAudioStreamFlags RTAUDIO_NONINTERLEAVED = 0x1; // Use non-interleaved buffers (default = interleaved).
142 static const RtAudioStreamFlags RTAUDIO_MINIMIZE_LATENCY = 0x2; // Attempt to set stream parameters for lowest possible latency.
143 static const RtAudioStreamFlags RTAUDIO_HOG_DEVICE = 0x4; // Attempt grab device and prevent use by others.
144 static const RtAudioStreamFlags RTAUDIO_SCHEDULE_REALTIME = 0x8; // Try to select realtime scheduling for callback thread.
145 static const RtAudioStreamFlags RTAUDIO_ALSA_USE_DEFAULT = 0x10; // Use the "default" PCM device (ALSA only).
146 static const RtAudioStreamFlags RTAUDIO_JACK_DONT_CONNECT = 0x20; // Do not automatically connect ports (JACK only).
148 /*! \typedef typedef unsigned long RtAudioStreamStatus;
149 \brief RtAudio stream status (over- or underflow) flags.
151 Notification of a stream over- or underflow is indicated by a
152 non-zero stream \c status argument in the RtAudioCallback function.
153 The stream status can be one of the following two options,
154 depending on whether the stream is open for output and/or input:
156 - \e RTAUDIO_INPUT_OVERFLOW: Input data was discarded because of an overflow condition at the driver.
157 - \e RTAUDIO_OUTPUT_UNDERFLOW: The output buffer ran low, likely producing a break in the output sound.
159 typedef unsigned int RtAudioStreamStatus;
160 static const RtAudioStreamStatus RTAUDIO_INPUT_OVERFLOW = 0x1; // Input data was discarded because of an overflow condition at the driver.
161 static const RtAudioStreamStatus RTAUDIO_OUTPUT_UNDERFLOW = 0x2; // The output buffer ran low, likely causing a gap in the output sound.
163 //! RtAudio callback function prototype.
165 All RtAudio clients must create a function of type RtAudioCallback
166 to read and/or write data from/to the audio stream. When the
167 underlying audio system is ready for new input or output data, this
168 function will be invoked.
170 \param outputBuffer For output (or duplex) streams, the client
171 should write \c nFrames of audio sample frames into this
172 buffer. This argument should be recast to the datatype
173 specified when the stream was opened. For input-only
174 streams, this argument will be NULL.
176 \param inputBuffer For input (or duplex) streams, this buffer will
177 hold \c nFrames of input audio sample frames. This
178 argument should be recast to the datatype specified when the
179 stream was opened. For output-only streams, this argument
182 \param nFrames The number of sample frames of input or output
183 data in the buffers. The actual buffer size in bytes is
184 dependent on the data type and number of channels in use.
186 \param streamTime The number of seconds that have elapsed since the
189 \param status If non-zero, this argument indicates a data overflow
190 or underflow condition for the stream. The particular
191 condition can be determined by comparison with the
192 RtAudioStreamStatus flags.
194 \param userData A pointer to optional data provided by the client
195 when opening the stream (default = NULL).
198 To continue normal stream operation, the RtAudioCallback function
199 should return a value of zero. To stop the stream and drain the
200 output buffer, the function should return a value of one. To abort
201 the stream immediately, the client should return a value of two.
203 typedef int (*RtAudioCallback)( void *outputBuffer, void *inputBuffer,
204 unsigned int nFrames,
206 RtAudioStreamStatus status,
209 /************************************************************************/
210 /*! \class RtAudioError
211 \brief Exception handling class for RtAudio.
213 The RtAudioError class is quite simple but it does allow errors to be
214 "caught" by RtAudioError::Type. See the RtAudio documentation to know
215 which methods can throw an RtAudioError.
217 /************************************************************************/
219 class RTAUDIO_DLL_PUBLIC RtAudioError : public std::runtime_error
222 //! Defined RtAudioError types.
224 WARNING, /*!< A non-critical error. */
225 DEBUG_WARNING, /*!< A non-critical error which might be useful for debugging. */
226 UNSPECIFIED, /*!< The default, unspecified error type. */
227 NO_DEVICES_FOUND, /*!< No devices found on system. */
228 INVALID_DEVICE, /*!< An invalid device ID was specified. */
229 MEMORY_ERROR, /*!< An error occured during memory allocation. */
230 INVALID_PARAMETER, /*!< An invalid parameter was specified to a function. */
231 INVALID_USE, /*!< The function was called incorrectly. */
232 DRIVER_ERROR, /*!< A system driver error occured. */
233 SYSTEM_ERROR, /*!< A system error occured. */
234 THREAD_ERROR /*!< A thread error occured. */
238 RtAudioError( const std::string& message,
239 Type type = RtAudioError::UNSPECIFIED )
240 : std::runtime_error(message), type_(type) {}
242 //! Prints thrown error message to stderr.
243 virtual void printMessage( void ) const
244 { std::cerr << '\n' << what() << "\n\n"; }
246 //! Returns the thrown error message type.
247 virtual const Type& getType(void) const { return type_; }
249 //! Returns the thrown error message string.
250 virtual const std::string getMessage(void) const
251 { return std::string(what()); }
257 //! RtAudio error callback function prototype.
259 \param type Type of error.
260 \param errorText Error description.
262 typedef void (*RtAudioErrorCallback)( RtAudioError::Type type, const std::string &errorText );
264 // **************************************************************** //
266 // RtAudio class declaration.
268 // RtAudio is a "controller" used to select an available audio i/o
269 // interface. It presents a common API for the user to call but all
270 // functionality is implemented by the class RtApi and its
271 // subclasses. RtAudio creates an instance of an RtApi subclass
272 // based on the user's API choice. If no choice is made, RtAudio
273 // attempts to make a "logical" API selection.
275 // **************************************************************** //
279 class RTAUDIO_DLL_PUBLIC RtAudio
283 //! Audio API specifier arguments.
285 UNSPECIFIED, /*!< Search for a working compiled API. */
286 LINUX_ALSA, /*!< The Advanced Linux Sound Architecture API. */
287 LINUX_PULSE, /*!< The Linux PulseAudio API. */
288 LINUX_OSS, /*!< The Linux Open Sound System API. */
289 UNIX_JACK, /*!< The Jack Low-Latency Audio Server API. */
290 MACOSX_CORE, /*!< Macintosh OS-X Core Audio API. */
291 WINDOWS_WASAPI, /*!< The Microsoft WASAPI API. */
292 WINDOWS_ASIO, /*!< The Steinberg Audio Stream I/O API. */
293 WINDOWS_DS, /*!< The Microsoft DirectSound API. */
294 RTAUDIO_DUMMY, /*!< A compilable but non-functional API. */
295 NUM_APIS /*!< Number of values in this enum. */
298 //! The public device information structure for returning queried values.
300 bool probed; /*!< true if the device capabilities were successfully probed. */
301 std::string name; /*!< Character string device identifier. */
302 unsigned int outputChannels; /*!< Maximum output channels supported by device. */
303 unsigned int inputChannels; /*!< Maximum input channels supported by device. */
304 unsigned int duplexChannels; /*!< Maximum simultaneous input/output channels supported by device. */
305 bool isDefaultOutput; /*!< true if this is the default output device. */
306 bool isDefaultInput; /*!< true if this is the default input device. */
307 std::vector<unsigned int> sampleRates; /*!< Supported sample rates (queried from list of standard rates). */
308 unsigned int preferredSampleRate; /*!< Preferred sample rate, e.g. for WASAPI the system sample rate. */
309 RtAudioFormat nativeFormats; /*!< Bit mask of supported data formats. */
311 // Default constructor.
313 :probed(false), outputChannels(0), inputChannels(0), duplexChannels(0),
314 isDefaultOutput(false), isDefaultInput(false), preferredSampleRate(0), nativeFormats(0) {}
317 //! The structure for specifying input or ouput stream parameters.
318 struct StreamParameters {
319 unsigned int deviceId; /*!< Device index (0 to getDeviceCount() - 1). */
320 unsigned int nChannels; /*!< Number of channels. */
321 unsigned int firstChannel; /*!< First channel index on device (default = 0). */
323 // Default constructor.
325 : deviceId(0), nChannels(0), firstChannel(0) {}
328 //! The structure for specifying stream options.
330 The following flags can be OR'ed together to allow a client to
331 make changes to the default stream behavior:
333 - \e RTAUDIO_NONINTERLEAVED: Use non-interleaved buffers (default = interleaved).
334 - \e RTAUDIO_MINIMIZE_LATENCY: Attempt to set stream parameters for lowest possible latency.
335 - \e RTAUDIO_HOG_DEVICE: Attempt grab device for exclusive use.
336 - \e RTAUDIO_SCHEDULE_REALTIME: Attempt to select realtime scheduling for callback thread.
337 - \e RTAUDIO_ALSA_USE_DEFAULT: Use the "default" PCM device (ALSA only).
339 By default, RtAudio streams pass and receive audio data from the
340 client in an interleaved format. By passing the
341 RTAUDIO_NONINTERLEAVED flag to the openStream() function, audio
342 data will instead be presented in non-interleaved buffers. In
343 this case, each buffer argument in the RtAudioCallback function
344 will point to a single array of data, with \c nFrames samples for
345 each channel concatenated back-to-back. For example, the first
346 sample of data for the second channel would be located at index \c
347 nFrames (assuming the \c buffer pointer was recast to the correct
348 data type for the stream).
350 Certain audio APIs offer a number of parameters that influence the
351 I/O latency of a stream. By default, RtAudio will attempt to set
352 these parameters internally for robust (glitch-free) performance
353 (though some APIs, like Windows DirectSound, make this difficult).
354 By passing the RTAUDIO_MINIMIZE_LATENCY flag to the openStream()
355 function, internal stream settings will be influenced in an attempt
356 to minimize stream latency, though possibly at the expense of stream
359 If the RTAUDIO_HOG_DEVICE flag is set, RtAudio will attempt to
360 open the input and/or output stream device(s) for exclusive use.
361 Note that this is not possible with all supported audio APIs.
363 If the RTAUDIO_SCHEDULE_REALTIME flag is set, RtAudio will attempt
364 to select realtime scheduling (round-robin) for the callback thread.
365 The \c priority parameter will only be used if the RTAUDIO_SCHEDULE_REALTIME
366 flag is set. It defines the thread's realtime priority.
368 If the RTAUDIO_ALSA_USE_DEFAULT flag is set, RtAudio will attempt to
369 open the "default" PCM device when using the ALSA API. Note that this
370 will override any specified input or output device id.
372 The \c numberOfBuffers parameter can be used to control stream
373 latency in the Windows DirectSound, Linux OSS, and Linux Alsa APIs
374 only. A value of two is usually the smallest allowed. Larger
375 numbers can potentially result in more robust stream performance,
376 though likely at the cost of stream latency. The value set by the
377 user is replaced during execution of the RtAudio::openStream()
378 function by the value actually used by the system.
380 The \c streamName parameter can be used to set the client name
381 when using the Jack API. By default, the client name is set to
382 RtApiJack. However, if you wish to create multiple instances of
383 RtAudio with Jack, each instance must have a unique client name.
385 struct StreamOptions {
386 RtAudioStreamFlags flags; /*!< A bit-mask of stream flags (RTAUDIO_NONINTERLEAVED, RTAUDIO_MINIMIZE_LATENCY, RTAUDIO_HOG_DEVICE, RTAUDIO_ALSA_USE_DEFAULT). */
387 unsigned int numberOfBuffers; /*!< Number of stream buffers. */
388 std::string streamName; /*!< A stream name (currently used only in Jack). */
389 int priority; /*!< Scheduling priority of callback thread (only used with flag RTAUDIO_SCHEDULE_REALTIME). */
391 // Default constructor.
393 : flags(0), numberOfBuffers(0), priority(0) {}
396 //! A static function to determine the current RtAudio version.
397 static std::string getVersion( void );
399 //! A static function to determine the available compiled audio APIs.
401 The values returned in the std::vector can be compared against
402 the enumerated list values. Note that there can be more than one
403 API compiled for certain operating systems.
405 static void getCompiledApi( std::vector<RtAudio::Api> &apis );
407 //! Return the name of a specified compiled audio API.
409 This obtains a short lower-case name used for identification purposes.
410 This value is guaranteed to remain identical across library versions.
411 If the API is unknown, this function will return the empty string.
413 static std::string getApiName( RtAudio::Api api );
415 //! Return the display name of a specified compiled audio API.
417 This obtains a long name used for display purposes.
418 If the API is unknown, this function will return the empty string.
420 static std::string getApiDisplayName( RtAudio::Api api );
422 //! Return the compiled audio API having the given name.
424 A case insensitive comparison will check the specified name
425 against the list of compiled APIs, and return the one which
426 matches. On failure, the function returns UNSPECIFIED.
428 static RtAudio::Api getCompiledApiByName( const std::string &name );
430 //! The class constructor.
432 The constructor performs minor initialization tasks. An exception
433 can be thrown if no API support is compiled.
435 If no API argument is specified and multiple API support has been
436 compiled, the default order of use is JACK, ALSA, OSS (Linux
437 systems) and ASIO, DS (Windows systems).
439 RtAudio( RtAudio::Api api=UNSPECIFIED );
443 If a stream is running or open, it will be stopped and closed
448 //! Returns the audio API specifier for the current instance of RtAudio.
449 RtAudio::Api getCurrentApi( void );
451 //! A public function that queries for the number of audio devices available.
453 This function performs a system query of available devices each time it
454 is called, thus supporting devices connected \e after instantiation. If
455 a system error occurs during processing, a warning will be issued.
457 unsigned int getDeviceCount( void );
459 //! Return an RtAudio::DeviceInfo structure for a specified device number.
462 Any device integer between 0 and getDeviceCount() - 1 is valid.
463 If an invalid argument is provided, an RtAudioError (type = INVALID_USE)
464 will be thrown. If a device is busy or otherwise unavailable, the
465 structure member "probed" will have a value of "false" and all
466 other members are undefined. If the specified device is the
467 current default input or output device, the corresponding
468 "isDefault" member will have a value of "true".
470 RtAudio::DeviceInfo getDeviceInfo( unsigned int device );
472 //! A function that returns the index of the default output device.
474 If the underlying audio API does not provide a "default
475 device", or if no devices are available, the return value will be
476 0. Note that this is a valid device identifier and it is the
477 client's responsibility to verify that a device is available
478 before attempting to open a stream.
480 unsigned int getDefaultOutputDevice( void );
482 //! A function that returns the index of the default input device.
484 If the underlying audio API does not provide a "default
485 device", or if no devices are available, the return value will be
486 0. Note that this is a valid device identifier and it is the
487 client's responsibility to verify that a device is available
488 before attempting to open a stream.
490 unsigned int getDefaultInputDevice( void );
492 //! A public function for opening a stream with the specified parameters.
494 An RtAudioError (type = SYSTEM_ERROR) is thrown if a stream cannot be
495 opened with the specified parameters or an error occurs during
496 processing. An RtAudioError (type = INVALID_USE) is thrown if any
497 invalid device ID or channel number parameters are specified.
499 \param outputParameters Specifies output stream parameters to use
500 when opening a stream, including a device ID, number of channels,
501 and starting channel number. For input-only streams, this
502 argument should be NULL. The device ID is an index value between
503 0 and getDeviceCount() - 1.
504 \param inputParameters Specifies input stream parameters to use
505 when opening a stream, including a device ID, number of channels,
506 and starting channel number. For output-only streams, this
507 argument should be NULL. The device ID is an index value between
508 0 and getDeviceCount() - 1.
509 \param format An RtAudioFormat specifying the desired sample data format.
510 \param sampleRate The desired sample rate (sample frames per second).
511 \param *bufferFrames A pointer to a value indicating the desired
512 internal buffer size in sample frames. The actual value
513 used by the device is returned via the same pointer. A
514 value of zero can be specified, in which case the lowest
515 allowable value is determined.
516 \param callback A client-defined function that will be invoked
517 when input data is available and/or output data is needed.
518 \param userData An optional pointer to data that can be accessed
519 from within the callback function.
520 \param options An optional pointer to a structure containing various
521 global stream options, including a list of OR'ed RtAudioStreamFlags
522 and a suggested number of stream buffers that can be used to
523 control stream latency. More buffers typically result in more
524 robust performance, though at a cost of greater latency. If a
525 value of zero is specified, a system-specific median value is
526 chosen. If the RTAUDIO_MINIMIZE_LATENCY flag bit is set, the
527 lowest allowable value is used. The actual value used is
528 returned via the structure argument. The parameter is API dependent.
529 \param errorCallback A client-defined function that will be invoked
530 when an error has occured.
532 void openStream( RtAudio::StreamParameters *outputParameters,
533 RtAudio::StreamParameters *inputParameters,
534 RtAudioFormat format, unsigned int sampleRate,
535 unsigned int *bufferFrames, RtAudioCallback callback,
536 void *userData = NULL, RtAudio::StreamOptions *options = NULL, RtAudioErrorCallback errorCallback = NULL );
538 //! A function that closes a stream and frees any associated stream memory.
540 If a stream is not open, this function issues a warning and
541 returns (no exception is thrown).
543 void closeStream( void );
545 //! A function that starts a stream.
547 An RtAudioError (type = SYSTEM_ERROR) is thrown if an error occurs
548 during processing. An RtAudioError (type = INVALID_USE) is thrown if a
549 stream is not open. A warning is issued if the stream is already
552 void startStream( void );
554 //! Stop a stream, allowing any samples remaining in the output queue to be played.
556 An RtAudioError (type = SYSTEM_ERROR) is thrown if an error occurs
557 during processing. An RtAudioError (type = INVALID_USE) is thrown if a
558 stream is not open. A warning is issued if the stream is already
561 void stopStream( void );
563 //! Stop a stream, discarding any samples remaining in the input/output queue.
565 An RtAudioError (type = SYSTEM_ERROR) is thrown if an error occurs
566 during processing. An RtAudioError (type = INVALID_USE) is thrown if a
567 stream is not open. A warning is issued if the stream is already
570 void abortStream( void );
572 //! Returns true if a stream is open and false if not.
573 bool isStreamOpen( void ) const;
575 //! Returns true if the stream is running and false if it is stopped or not open.
576 bool isStreamRunning( void ) const;
578 //! Returns the number of elapsed seconds since the stream was started.
580 If a stream is not open, an RtAudioError (type = INVALID_USE) will be thrown.
582 double getStreamTime( void );
584 //! Set the stream time to a time in seconds greater than or equal to 0.0.
586 If a stream is not open, an RtAudioError (type = INVALID_USE) will be thrown.
588 void setStreamTime( double time );
590 //! Returns the internal stream latency in sample frames.
592 The stream latency refers to delay in audio input and/or output
593 caused by internal buffering by the audio system and/or hardware.
594 For duplex streams, the returned value will represent the sum of
595 the input and output latencies. If a stream is not open, an
596 RtAudioError (type = INVALID_USE) will be thrown. If the API does not
597 report latency, the return value will be zero.
599 long getStreamLatency( void );
601 //! Returns actual sample rate in use by the stream.
603 On some systems, the sample rate used may be slightly different
604 than that specified in the stream parameters. If a stream is not
605 open, an RtAudioError (type = INVALID_USE) will be thrown.
607 unsigned int getStreamSampleRate( void );
609 //! Specify whether warning messages should be printed to stderr.
610 void showWarnings( bool value = true );
614 void openRtApi( RtAudio::Api api );
618 // Operating system dependent thread functionality.
619 #if defined(__WINDOWS_DS__) || defined(__WINDOWS_ASIO__) || defined(__WINDOWS_WASAPI__)
628 typedef uintptr_t ThreadHandle;
629 typedef CRITICAL_SECTION StreamMutex;
631 #elif defined(__LINUX_ALSA__) || defined(__LINUX_PULSE__) || defined(__UNIX_JACK__) || defined(__LINUX_OSS__) || defined(__MACOSX_CORE__)
632 // Using pthread library for various flavors of unix.
635 typedef pthread_t ThreadHandle;
636 typedef pthread_mutex_t StreamMutex;
638 #else // Setup for "dummy" behavior
640 #define __RTAUDIO_DUMMY__
641 typedef int ThreadHandle;
642 typedef int StreamMutex;
646 // This global structure type is used to pass callback information
647 // between the private RtAudio stream structure and global callback
648 // handling functions.
649 struct CallbackInfo {
650 void *object; // Used as a "this" pointer.
655 void *apiInfo; // void pointer for API specific callback information
660 // Default constructor.
662 :object(0), callback(0), userData(0), errorCallback(0), apiInfo(0), isRunning(false), doRealtime(false), priority(0) {}
665 // **************************************************************** //
667 // RtApi class declaration.
669 // Subclasses of RtApi contain all API- and OS-specific code necessary
670 // to fully implement the RtAudio API.
672 // Note that RtApi is an abstract base class and cannot be
673 // explicitly instantiated. The class RtAudio will create an
674 // instance of an RtApi subclass (RtApiOss, RtApiAlsa,
675 // RtApiJack, RtApiCore, RtApiDs, or RtApiAsio).
677 // **************************************************************** //
679 #pragma pack(push, 1)
688 S24& operator = ( const int& i ) {
689 c3[0] = (i & 0x000000ff);
690 c3[1] = (i & 0x0000ff00) >> 8;
691 c3[2] = (i & 0x00ff0000) >> 16;
695 S24( const double& d ) { *this = (int) d; }
696 S24( const float& f ) { *this = (int) f; }
697 S24( const signed short& s ) { *this = (int) s; }
698 S24( const char& c ) { *this = (int) c; }
701 int i = c3[0] | (c3[1] << 8) | (c3[2] << 16);
702 if (i & 0x800000) i |= ~0xffffff;
708 #if defined( HAVE_GETTIMEOFDAY )
709 #include <sys/time.h>
714 class RTAUDIO_DLL_PUBLIC RtApi
720 virtual RtAudio::Api getCurrentApi( void ) = 0;
721 virtual unsigned int getDeviceCount( void ) = 0;
722 virtual RtAudio::DeviceInfo getDeviceInfo( unsigned int device ) = 0;
723 virtual unsigned int getDefaultInputDevice( void );
724 virtual unsigned int getDefaultOutputDevice( void );
725 void openStream( RtAudio::StreamParameters *outputParameters,
726 RtAudio::StreamParameters *inputParameters,
727 RtAudioFormat format, unsigned int sampleRate,
728 unsigned int *bufferFrames, RtAudioCallback callback,
729 void *userData, RtAudio::StreamOptions *options,
730 RtAudioErrorCallback errorCallback );
731 virtual void closeStream( void );
732 virtual void startStream( void ) = 0;
733 virtual void stopStream( void ) = 0;
734 virtual void abortStream( void ) = 0;
735 long getStreamLatency( void );
736 unsigned int getStreamSampleRate( void );
737 virtual double getStreamTime( void );
738 virtual void setStreamTime( double time );
739 bool isStreamOpen( void ) const { return stream_.state != STREAM_CLOSED; }
740 bool isStreamRunning( void ) const { return stream_.state == STREAM_RUNNING; }
741 void showWarnings( bool value ) { showWarnings_ = value; }
746 static const unsigned int MAX_SAMPLE_RATES;
747 static const unsigned int SAMPLE_RATES[];
749 enum { FAILURE, SUCCESS };
765 // A protected structure used for buffer conversion.
769 RtAudioFormat inFormat, outFormat;
770 std::vector<int> inOffset;
771 std::vector<int> outOffset;
774 // A protected structure for audio streams.
776 unsigned int device[2]; // Playback and record, respectively.
777 void *apiHandle; // void pointer for API specific stream handle information
778 StreamMode mode; // OUTPUT, INPUT, or DUPLEX.
779 StreamState state; // STOPPED, RUNNING, or CLOSED
780 char *userBuffer[2]; // Playback and record, respectively.
782 bool doConvertBuffer[2]; // Playback and record, respectively.
783 bool userInterleaved;
784 bool deviceInterleaved[2]; // Playback and record, respectively.
785 bool doByteSwap[2]; // Playback and record, respectively.
786 unsigned int sampleRate;
787 unsigned int bufferSize;
788 unsigned int nBuffers;
789 unsigned int nUserChannels[2]; // Playback and record, respectively.
790 unsigned int nDeviceChannels[2]; // Playback and record channels, respectively.
791 unsigned int channelOffset[2]; // Playback and record, respectively.
792 unsigned long latency[2]; // Playback and record, respectively.
793 RtAudioFormat userFormat;
794 RtAudioFormat deviceFormat[2]; // Playback and record, respectively.
796 CallbackInfo callbackInfo;
797 ConvertInfo convertInfo[2];
798 double streamTime; // Number of elapsed seconds since the stream started.
800 #if defined(HAVE_GETTIMEOFDAY)
801 struct timeval lastTickTimestamp;
805 :apiHandle(0), deviceBuffer(0) { device[0] = 11111; device[1] = 11111; }
809 typedef signed short Int16;
810 typedef signed int Int32;
811 typedef float Float32;
812 typedef double Float64;
814 std::ostringstream errorStream_;
815 std::string errorText_;
818 bool firstErrorOccurred_;
821 Protected, api-specific method that attempts to open a device
822 with the given parameters. This function MUST be implemented by
823 all subclasses. If an error is encountered during the probe, a
824 "warning" message is reported and FAILURE is returned. A
825 successful probe is indicated by a return value of SUCCESS.
827 virtual bool probeDeviceOpen( unsigned int device, StreamMode mode, unsigned int channels,
828 unsigned int firstChannel, unsigned int sampleRate,
829 RtAudioFormat format, unsigned int *bufferSize,
830 RtAudio::StreamOptions *options );
832 //! A protected function used to increment the stream time.
833 void tickStreamTime( void );
835 //! Protected common method to clear an RtApiStream structure.
836 void clearStreamInfo();
839 Protected common method that throws an RtAudioError (type =
840 INVALID_USE) if a stream is not open.
842 void verifyStream( void );
844 //! Protected common error method to allow global control over error handling.
845 void error( RtAudioError::Type type );
848 Protected method used to perform format, channel number, and/or interleaving
849 conversions between the user and device buffers.
851 void convertBuffer( char *outBuffer, char *inBuffer, ConvertInfo &info );
853 //! Protected common method used to perform byte-swapping on buffers.
854 void byteSwapBuffer( char *buffer, unsigned int samples, RtAudioFormat format );
856 //! Protected common method that returns the number of bytes for a given format.
857 unsigned int formatBytes( RtAudioFormat format );
859 //! Protected common method that sets up the parameters for buffer conversion.
860 void setConvertInfo( StreamMode mode, unsigned int firstChannel );
863 // **************************************************************** //
865 // Inline RtAudio definitions.
867 // **************************************************************** //
869 inline RtAudio::Api RtAudio :: getCurrentApi( void ) { return rtapi_->getCurrentApi(); }
870 inline unsigned int RtAudio :: getDeviceCount( void ) { return rtapi_->getDeviceCount(); }
871 inline RtAudio::DeviceInfo RtAudio :: getDeviceInfo( unsigned int device ) { return rtapi_->getDeviceInfo( device ); }
872 inline unsigned int RtAudio :: getDefaultInputDevice( void ) { return rtapi_->getDefaultInputDevice(); }
873 inline unsigned int RtAudio :: getDefaultOutputDevice( void ) { return rtapi_->getDefaultOutputDevice(); }
874 inline void RtAudio :: closeStream( void ) { return rtapi_->closeStream(); }
875 inline void RtAudio :: startStream( void ) { return rtapi_->startStream(); }
876 inline void RtAudio :: stopStream( void ) { return rtapi_->stopStream(); }
877 inline void RtAudio :: abortStream( void ) { return rtapi_->abortStream(); }
878 inline bool RtAudio :: isStreamOpen( void ) const { return rtapi_->isStreamOpen(); }
879 inline bool RtAudio :: isStreamRunning( void ) const { return rtapi_->isStreamRunning(); }
880 inline long RtAudio :: getStreamLatency( void ) { return rtapi_->getStreamLatency(); }
881 inline unsigned int RtAudio :: getStreamSampleRate( void ) { return rtapi_->getStreamSampleRate(); }
882 inline double RtAudio :: getStreamTime( void ) { return rtapi_->getStreamTime(); }
883 inline void RtAudio :: setStreamTime( double time ) { return rtapi_->setStreamTime( time ); }
884 inline void RtAudio :: showWarnings( bool value ) { rtapi_->showWarnings( value ); }
886 // RtApi Subclass prototypes.
888 #if defined(__MACOSX_CORE__)
890 #include <CoreAudio/AudioHardware.h>
892 class RtApiCore: public RtApi
898 RtAudio::Api getCurrentApi( void ) { return RtAudio::MACOSX_CORE; }
899 unsigned int getDeviceCount( void );
900 RtAudio::DeviceInfo getDeviceInfo( unsigned int device );
901 unsigned int getDefaultOutputDevice( void );
902 unsigned int getDefaultInputDevice( void );
903 void closeStream( void );
904 void startStream( void );
905 void stopStream( void );
906 void abortStream( void );
908 // This function is intended for internal use only. It must be
909 // public because it is called by the internal callback handler,
910 // which is not a member of RtAudio. External use of this function
911 // will most likely produce highly undesireable results!
912 bool callbackEvent( AudioDeviceID deviceId,
913 const AudioBufferList *inBufferList,
914 const AudioBufferList *outBufferList );
918 bool probeDeviceOpen( unsigned int device, StreamMode mode, unsigned int channels,
919 unsigned int firstChannel, unsigned int sampleRate,
920 RtAudioFormat format, unsigned int *bufferSize,
921 RtAudio::StreamOptions *options );
922 static const char* getErrorCode( OSStatus code );
927 #if defined(__UNIX_JACK__)
929 class RtApiJack: public RtApi
935 RtAudio::Api getCurrentApi( void ) { return RtAudio::UNIX_JACK; }
936 unsigned int getDeviceCount( void );
937 RtAudio::DeviceInfo getDeviceInfo( unsigned int device );
938 void closeStream( void );
939 void startStream( void );
940 void stopStream( void );
941 void abortStream( void );
943 // This function is intended for internal use only. It must be
944 // public because it is called by the internal callback handler,
945 // which is not a member of RtAudio. External use of this function
946 // will most likely produce highly undesireable results!
947 bool callbackEvent( unsigned long nframes );
951 bool probeDeviceOpen( unsigned int device, StreamMode mode, unsigned int channels,
952 unsigned int firstChannel, unsigned int sampleRate,
953 RtAudioFormat format, unsigned int *bufferSize,
954 RtAudio::StreamOptions *options );
956 bool shouldAutoconnect_;
961 #if defined(__WINDOWS_ASIO__)
963 class RtApiAsio: public RtApi
969 RtAudio::Api getCurrentApi( void ) { return RtAudio::WINDOWS_ASIO; }
970 unsigned int getDeviceCount( void );
971 RtAudio::DeviceInfo getDeviceInfo( unsigned int device );
972 void closeStream( void );
973 void startStream( void );
974 void stopStream( void );
975 void abortStream( void );
977 // This function is intended for internal use only. It must be
978 // public because it is called by the internal callback handler,
979 // which is not a member of RtAudio. External use of this function
980 // will most likely produce highly undesireable results!
981 bool callbackEvent( long bufferIndex );
985 std::vector<RtAudio::DeviceInfo> devices_;
986 void saveDeviceInfo( void );
988 bool probeDeviceOpen( unsigned int device, StreamMode mode, unsigned int channels,
989 unsigned int firstChannel, unsigned int sampleRate,
990 RtAudioFormat format, unsigned int *bufferSize,
991 RtAudio::StreamOptions *options );
996 #if defined(__WINDOWS_DS__)
998 class RtApiDs: public RtApi
1004 RtAudio::Api getCurrentApi( void ) { return RtAudio::WINDOWS_DS; }
1005 unsigned int getDeviceCount( void );
1006 unsigned int getDefaultOutputDevice( void );
1007 unsigned int getDefaultInputDevice( void );
1008 RtAudio::DeviceInfo getDeviceInfo( unsigned int device );
1009 void closeStream( void );
1010 void startStream( void );
1011 void stopStream( void );
1012 void abortStream( void );
1014 // This function is intended for internal use only. It must be
1015 // public because it is called by the internal callback handler,
1016 // which is not a member of RtAudio. External use of this function
1017 // will most likely produce highly undesireable results!
1018 void callbackEvent( void );
1022 bool coInitialized_;
1023 bool buffersRolling;
1024 long duplexPrerollBytes;
1025 std::vector<struct DsDevice> dsDevices;
1026 bool probeDeviceOpen( unsigned int device, StreamMode mode, unsigned int channels,
1027 unsigned int firstChannel, unsigned int sampleRate,
1028 RtAudioFormat format, unsigned int *bufferSize,
1029 RtAudio::StreamOptions *options );
1034 #if defined(__WINDOWS_WASAPI__)
1036 struct IMMDeviceEnumerator;
1038 class RtApiWasapi : public RtApi
1042 virtual ~RtApiWasapi();
1044 RtAudio::Api getCurrentApi( void ) { return RtAudio::WINDOWS_WASAPI; }
1045 unsigned int getDeviceCount( void );
1046 RtAudio::DeviceInfo getDeviceInfo( unsigned int device );
1047 unsigned int getDefaultOutputDevice( void );
1048 unsigned int getDefaultInputDevice( void );
1049 void closeStream( void );
1050 void startStream( void );
1051 void stopStream( void );
1052 void abortStream( void );
1055 bool coInitialized_;
1056 IMMDeviceEnumerator* deviceEnumerator_;
1058 bool probeDeviceOpen( unsigned int device, StreamMode mode, unsigned int channels,
1059 unsigned int firstChannel, unsigned int sampleRate,
1060 RtAudioFormat format, unsigned int* bufferSize,
1061 RtAudio::StreamOptions* options );
1063 static DWORD WINAPI runWasapiThread( void* wasapiPtr );
1064 static DWORD WINAPI stopWasapiThread( void* wasapiPtr );
1065 static DWORD WINAPI abortWasapiThread( void* wasapiPtr );
1066 void wasapiThread();
1071 #if defined(__LINUX_ALSA__)
1073 class RtApiAlsa: public RtApi
1079 RtAudio::Api getCurrentApi() { return RtAudio::LINUX_ALSA; }
1080 unsigned int getDeviceCount( void );
1081 RtAudio::DeviceInfo getDeviceInfo( unsigned int device );
1082 void closeStream( void );
1083 void startStream( void );
1084 void stopStream( void );
1085 void abortStream( void );
1087 // This function is intended for internal use only. It must be
1088 // public because it is called by the internal callback handler,
1089 // which is not a member of RtAudio. External use of this function
1090 // will most likely produce highly undesireable results!
1091 void callbackEvent( void );
1095 std::vector<RtAudio::DeviceInfo> devices_;
1096 void saveDeviceInfo( void );
1097 bool probeDeviceOpen( unsigned int device, StreamMode mode, unsigned int channels,
1098 unsigned int firstChannel, unsigned int sampleRate,
1099 RtAudioFormat format, unsigned int *bufferSize,
1100 RtAudio::StreamOptions *options );
1105 #if defined(__LINUX_PULSE__)
1107 class RtApiPulse: public RtApi
1111 RtAudio::Api getCurrentApi() { return RtAudio::LINUX_PULSE; }
1112 unsigned int getDeviceCount( void );
1113 RtAudio::DeviceInfo getDeviceInfo( unsigned int device );
1114 void closeStream( void );
1115 void startStream( void );
1116 void stopStream( void );
1117 void abortStream( void );
1119 // This function is intended for internal use only. It must be
1120 // public because it is called by the internal callback handler,
1121 // which is not a member of RtAudio. External use of this function
1122 // will most likely produce highly undesireable results!
1123 void callbackEvent( void );
1127 std::vector<RtAudio::DeviceInfo> devices_;
1128 void saveDeviceInfo( void );
1129 bool probeDeviceOpen( unsigned int device, StreamMode mode, unsigned int channels,
1130 unsigned int firstChannel, unsigned int sampleRate,
1131 RtAudioFormat format, unsigned int *bufferSize,
1132 RtAudio::StreamOptions *options );
1137 #if defined(__LINUX_OSS__)
1139 class RtApiOss: public RtApi
1145 RtAudio::Api getCurrentApi() { return RtAudio::LINUX_OSS; }
1146 unsigned int getDeviceCount( void );
1147 RtAudio::DeviceInfo getDeviceInfo( unsigned int device );
1148 void closeStream( void );
1149 void startStream( void );
1150 void stopStream( void );
1151 void abortStream( void );
1153 // This function is intended for internal use only. It must be
1154 // public because it is called by the internal callback handler,
1155 // which is not a member of RtAudio. External use of this function
1156 // will most likely produce highly undesireable results!
1157 void callbackEvent( void );
1161 bool probeDeviceOpen( unsigned int device, StreamMode mode, unsigned int channels,
1162 unsigned int firstChannel, unsigned int sampleRate,
1163 RtAudioFormat format, unsigned int *bufferSize,
1164 RtAudio::StreamOptions *options );
1169 #if defined(__RTAUDIO_DUMMY__)
1171 class RtApiDummy: public RtApi
1175 RtApiDummy() { errorText_ = "RtApiDummy: This class provides no functionality."; error( RtAudioError::WARNING ); }
1176 RtAudio::Api getCurrentApi( void ) { return RtAudio::RTAUDIO_DUMMY; }
1177 unsigned int getDeviceCount( void ) { return 0; }
1178 RtAudio::DeviceInfo getDeviceInfo( unsigned int /*device*/ ) { RtAudio::DeviceInfo info; return info; }
1179 void closeStream( void ) {}
1180 void startStream( void ) {}
1181 void stopStream( void ) {}
1182 void abortStream( void ) {}
1186 bool probeDeviceOpen( unsigned int /*device*/, StreamMode /*mode*/, unsigned int /*channels*/,
1187 unsigned int /*firstChannel*/, unsigned int /*sampleRate*/,
1188 RtAudioFormat /*format*/, unsigned int * /*bufferSize*/,
1189 RtAudio::StreamOptions * /*options*/ ) { return false; }
1196 // Indentation settings for Vim and Emacs
1199 // c-basic-offset: 2
1200 // indent-tabs-mode: nil
1203 // vim: et sts=2 sw=2