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 WWW site: http://www.music.mcgill.ca/~gary/rtaudio/
12 RtAudio: realtime audio i/o C++ classes
13 Copyright (c) 2001-2016 Gary P. Scavone
15 Permission is hereby granted, free of charge, to any person
16 obtaining a copy of this software and associated documentation files
17 (the "Software"), to deal in the Software without restriction,
18 including without limitation the rights to use, copy, modify, merge,
19 publish, distribute, sublicense, and/or sell copies of the Software,
20 and to permit persons to whom the Software is furnished to do so,
21 subject to the following conditions:
23 The above copyright notice and this permission notice shall be
24 included in all copies or substantial portions of the Software.
26 Any person wishing to distribute modifications to the Software is
27 asked to send the modifications to the original developer so that
28 they can be incorporated into the canonical version. This is,
29 however, not a binding provision of this license.
31 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
32 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
33 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
34 IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
35 ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
36 CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
37 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
39 /************************************************************************/
48 #define RTAUDIO_VERSION "4.1.2"
55 /*! \typedef typedef unsigned long RtAudioFormat;
56 \brief RtAudio data format type.
58 Support for signed integers and floats. Audio data fed to/from an
59 RtAudio stream is assumed to ALWAYS be in host byte order. The
60 internal routines will automatically take care of any necessary
61 byte-swapping between the host format and the soundcard. Thus,
62 endian-ness is not a concern in the following format definitions.
64 - \e RTAUDIO_SINT8: 8-bit signed integer.
65 - \e RTAUDIO_SINT16: 16-bit signed integer.
66 - \e RTAUDIO_SINT24: 24-bit signed integer.
67 - \e RTAUDIO_SINT32: 32-bit signed integer.
68 - \e RTAUDIO_FLOAT32: Normalized between plus/minus 1.0.
69 - \e RTAUDIO_FLOAT64: Normalized between plus/minus 1.0.
71 typedef unsigned long RtAudioFormat;
72 static const RtAudioFormat RTAUDIO_SINT8 = 0x1; // 8-bit signed integer.
73 static const RtAudioFormat RTAUDIO_SINT16 = 0x2; // 16-bit signed integer.
74 static const RtAudioFormat RTAUDIO_SINT24 = 0x4; // 24-bit signed integer.
75 static const RtAudioFormat RTAUDIO_SINT32 = 0x8; // 32-bit signed integer.
76 static const RtAudioFormat RTAUDIO_FLOAT32 = 0x10; // Normalized between plus/minus 1.0.
77 static const RtAudioFormat RTAUDIO_FLOAT64 = 0x20; // Normalized between plus/minus 1.0.
79 /*! \typedef typedef unsigned long RtAudioStreamFlags;
80 \brief RtAudio stream option flags.
82 The following flags can be OR'ed together to allow a client to
83 make changes to the default stream behavior:
85 - \e RTAUDIO_NONINTERLEAVED: Use non-interleaved buffers (default = interleaved).
86 - \e RTAUDIO_MINIMIZE_LATENCY: Attempt to set stream parameters for lowest possible latency.
87 - \e RTAUDIO_HOG_DEVICE: Attempt grab device for exclusive use.
88 - \e RTAUDIO_ALSA_USE_DEFAULT: Use the "default" PCM device (ALSA only).
90 By default, RtAudio streams pass and receive audio data from the
91 client in an interleaved format. By passing the
92 RTAUDIO_NONINTERLEAVED flag to the openStream() function, audio
93 data will instead be presented in non-interleaved buffers. In
94 this case, each buffer argument in the RtAudioCallback function
95 will point to a single array of data, with \c nFrames samples for
96 each channel concatenated back-to-back. For example, the first
97 sample of data for the second channel would be located at index \c
98 nFrames (assuming the \c buffer pointer was recast to the correct
99 data type for the stream).
101 Certain audio APIs offer a number of parameters that influence the
102 I/O latency of a stream. By default, RtAudio will attempt to set
103 these parameters internally for robust (glitch-free) performance
104 (though some APIs, like Windows Direct Sound, make this difficult).
105 By passing the RTAUDIO_MINIMIZE_LATENCY flag to the openStream()
106 function, internal stream settings will be influenced in an attempt
107 to minimize stream latency, though possibly at the expense of stream
110 If the RTAUDIO_HOG_DEVICE flag is set, RtAudio will attempt to
111 open the input and/or output stream device(s) for exclusive use.
112 Note that this is not possible with all supported audio APIs.
114 If the RTAUDIO_SCHEDULE_REALTIME flag is set, RtAudio will attempt
115 to select realtime scheduling (round-robin) for the callback thread.
117 If the RTAUDIO_ALSA_USE_DEFAULT flag is set, RtAudio will attempt to
118 open the "default" PCM device when using the ALSA API. Note that this
119 will override any specified input or output device id.
121 typedef unsigned int RtAudioStreamFlags;
122 static const RtAudioStreamFlags RTAUDIO_NONINTERLEAVED = 0x1; // Use non-interleaved buffers (default = interleaved).
123 static const RtAudioStreamFlags RTAUDIO_MINIMIZE_LATENCY = 0x2; // Attempt to set stream parameters for lowest possible latency.
124 static const RtAudioStreamFlags RTAUDIO_HOG_DEVICE = 0x4; // Attempt grab device and prevent use by others.
125 static const RtAudioStreamFlags RTAUDIO_SCHEDULE_REALTIME = 0x8; // Try to select realtime scheduling for callback thread.
126 static const RtAudioStreamFlags RTAUDIO_ALSA_USE_DEFAULT = 0x10; // Use the "default" PCM device (ALSA only).
128 /*! \typedef typedef unsigned long RtAudioStreamStatus;
129 \brief RtAudio stream status (over- or underflow) flags.
131 Notification of a stream over- or underflow is indicated by a
132 non-zero stream \c status argument in the RtAudioCallback function.
133 The stream status can be one of the following two options,
134 depending on whether the stream is open for output and/or input:
136 - \e RTAUDIO_INPUT_OVERFLOW: Input data was discarded because of an overflow condition at the driver.
137 - \e RTAUDIO_OUTPUT_UNDERFLOW: The output buffer ran low, likely producing a break in the output sound.
139 typedef unsigned int RtAudioStreamStatus;
140 static const RtAudioStreamStatus RTAUDIO_INPUT_OVERFLOW = 0x1; // Input data was discarded because of an overflow condition at the driver.
141 static const RtAudioStreamStatus RTAUDIO_OUTPUT_UNDERFLOW = 0x2; // The output buffer ran low, likely causing a gap in the output sound.
143 //! RtAudio callback function prototype.
145 All RtAudio clients must create a function of type RtAudioCallback
146 to read and/or write data from/to the audio stream. When the
147 underlying audio system is ready for new input or output data, this
148 function will be invoked.
150 \param outputBuffer For output (or duplex) streams, the client
151 should write \c nFrames of audio sample frames into this
152 buffer. This argument should be recast to the datatype
153 specified when the stream was opened. For input-only
154 streams, this argument will be NULL.
156 \param inputBuffer For input (or duplex) streams, this buffer will
157 hold \c nFrames of input audio sample frames. This
158 argument should be recast to the datatype specified when the
159 stream was opened. For output-only streams, this argument
162 \param nFrames The number of sample frames of input or output
163 data in the buffers. The actual buffer size in bytes is
164 dependent on the data type and number of channels in use.
166 \param streamTime The number of seconds that have elapsed since the
169 \param status If non-zero, this argument indicates a data overflow
170 or underflow condition for the stream. The particular
171 condition can be determined by comparison with the
172 RtAudioStreamStatus flags.
174 \param userData A pointer to optional data provided by the client
175 when opening the stream (default = NULL).
177 To continue normal stream operation, the RtAudioCallback function
178 should return a value of zero. To stop the stream and drain the
179 output buffer, the function should return a value of one. To abort
180 the stream immediately, the client should return a value of two.
182 typedef int (*RtAudioCallback)( void *outputBuffer, void *inputBuffer,
183 unsigned int nFrames,
185 RtAudioStreamStatus status,
188 /************************************************************************/
189 /*! \class RtAudioError
190 \brief Exception handling class for RtAudio.
192 The RtAudioError class is quite simple but it does allow errors to be
193 "caught" by RtAudioError::Type. See the RtAudio documentation to know
194 which methods can throw an RtAudioError.
196 /************************************************************************/
198 class RtAudioError : public std::runtime_error
201 //! Defined RtAudioError types.
203 WARNING, /*!< A non-critical error. */
204 DEBUG_WARNING, /*!< A non-critical error which might be useful for debugging. */
205 UNSPECIFIED, /*!< The default, unspecified error type. */
206 NO_DEVICES_FOUND, /*!< No devices found on system. */
207 INVALID_DEVICE, /*!< An invalid device ID was specified. */
208 MEMORY_ERROR, /*!< An error occured during memory allocation. */
209 INVALID_PARAMETER, /*!< An invalid parameter was specified to a function. */
210 INVALID_USE, /*!< The function was called incorrectly. */
211 DRIVER_ERROR, /*!< A system driver error occured. */
212 SYSTEM_ERROR, /*!< A system error occured. */
213 THREAD_ERROR /*!< A thread error occured. */
217 RtAudioError( const std::string& message,
218 Type type = RtAudioError::UNSPECIFIED )
219 : std::runtime_error(message), type_(type) {}
221 //! Prints thrown error message to stderr.
222 virtual void printMessage( void ) const
223 { std::cerr << '\n' << what() << "\n\n"; }
225 //! Returns the thrown error message type.
226 virtual const Type& getType(void) const { return type_; }
228 //! Returns the thrown error message string.
229 virtual const std::string getMessage(void) const
230 { return std::string(what()); }
236 //! RtAudio error callback function prototype.
238 \param type Type of error.
239 \param errorText Error description.
241 typedef void (*RtAudioErrorCallback)( RtAudioError::Type type, const std::string &errorText );
243 // **************************************************************** //
245 // RtAudio class declaration.
247 // RtAudio is a "controller" used to select an available audio i/o
248 // interface. It presents a common API for the user to call but all
249 // functionality is implemented by the class RtApi and its
250 // subclasses. RtAudio creates an instance of an RtApi subclass
251 // based on the user's API choice. If no choice is made, RtAudio
252 // attempts to make a "logical" API selection.
254 // **************************************************************** //
262 //! Audio API specifier arguments.
264 UNSPECIFIED, /*!< Search for a working compiled API. */
265 LINUX_ALSA, /*!< The Advanced Linux Sound Architecture API. */
266 LINUX_PULSE, /*!< The Linux PulseAudio API. */
267 LINUX_OSS, /*!< The Linux Open Sound System API. */
268 UNIX_JACK, /*!< The Jack Low-Latency Audio Server API. */
269 MACOSX_CORE, /*!< Macintosh OS-X Core Audio API. */
270 WINDOWS_WASAPI, /*!< The Microsoft WASAPI API. */
271 WINDOWS_ASIO, /*!< The Steinberg Audio Stream I/O API. */
272 WINDOWS_DS, /*!< The Microsoft Direct Sound API. */
273 RTAUDIO_DUMMY /*!< A compilable but non-functional API. */
276 //! The public device information structure for returning queried values.
278 bool probed; /*!< true if the device capabilities were successfully probed. */
279 std::string name; /*!< Character string device identifier. */
280 unsigned int outputChannels; /*!< Maximum output channels supported by device. */
281 unsigned int inputChannels; /*!< Maximum input channels supported by device. */
282 unsigned int duplexChannels; /*!< Maximum simultaneous input/output channels supported by device. */
283 bool isDefaultOutput; /*!< true if this is the default output device. */
284 bool isDefaultInput; /*!< true if this is the default input device. */
285 std::vector<unsigned int> sampleRates; /*!< Supported sample rates (queried from list of standard rates). */
286 unsigned int preferredSampleRate; /*!< Preferred sample rate, eg. for WASAPI the system sample rate. */
287 RtAudioFormat nativeFormats; /*!< Bit mask of supported data formats. */
289 // Default constructor.
291 :probed(false), outputChannels(0), inputChannels(0), duplexChannels(0),
292 isDefaultOutput(false), isDefaultInput(false), preferredSampleRate(0), nativeFormats(0) {}
295 //! The structure for specifying input or ouput stream parameters.
296 struct StreamParameters {
297 unsigned int deviceId; /*!< Device index (0 to getDeviceCount() - 1). */
298 unsigned int nChannels; /*!< Number of channels. */
299 unsigned int firstChannel; /*!< First channel index on device (default = 0). */
301 // Default constructor.
303 : deviceId(0), nChannels(0), firstChannel(0) {}
306 //! The structure for specifying stream options.
308 The following flags can be OR'ed together to allow a client to
309 make changes to the default stream behavior:
311 - \e RTAUDIO_NONINTERLEAVED: Use non-interleaved buffers (default = interleaved).
312 - \e RTAUDIO_MINIMIZE_LATENCY: Attempt to set stream parameters for lowest possible latency.
313 - \e RTAUDIO_HOG_DEVICE: Attempt grab device for exclusive use.
314 - \e RTAUDIO_SCHEDULE_REALTIME: Attempt to select realtime scheduling for callback thread.
315 - \e RTAUDIO_ALSA_USE_DEFAULT: Use the "default" PCM device (ALSA only).
317 By default, RtAudio streams pass and receive audio data from the
318 client in an interleaved format. By passing the
319 RTAUDIO_NONINTERLEAVED flag to the openStream() function, audio
320 data will instead be presented in non-interleaved buffers. In
321 this case, each buffer argument in the RtAudioCallback function
322 will point to a single array of data, with \c nFrames samples for
323 each channel concatenated back-to-back. For example, the first
324 sample of data for the second channel would be located at index \c
325 nFrames (assuming the \c buffer pointer was recast to the correct
326 data type for the stream).
328 Certain audio APIs offer a number of parameters that influence the
329 I/O latency of a stream. By default, RtAudio will attempt to set
330 these parameters internally for robust (glitch-free) performance
331 (though some APIs, like Windows Direct Sound, make this difficult).
332 By passing the RTAUDIO_MINIMIZE_LATENCY flag to the openStream()
333 function, internal stream settings will be influenced in an attempt
334 to minimize stream latency, though possibly at the expense of stream
337 If the RTAUDIO_HOG_DEVICE flag is set, RtAudio will attempt to
338 open the input and/or output stream device(s) for exclusive use.
339 Note that this is not possible with all supported audio APIs.
341 If the RTAUDIO_SCHEDULE_REALTIME flag is set, RtAudio will attempt
342 to select realtime scheduling (round-robin) for the callback thread.
343 The \c priority parameter will only be used if the RTAUDIO_SCHEDULE_REALTIME
344 flag is set. It defines the thread's realtime priority.
346 If the RTAUDIO_ALSA_USE_DEFAULT flag is set, RtAudio will attempt to
347 open the "default" PCM device when using the ALSA API. Note that this
348 will override any specified input or output device id.
350 The \c numberOfBuffers parameter can be used to control stream
351 latency in the Windows DirectSound, Linux OSS, and Linux Alsa APIs
352 only. A value of two is usually the smallest allowed. Larger
353 numbers can potentially result in more robust stream performance,
354 though likely at the cost of stream latency. The value set by the
355 user is replaced during execution of the RtAudio::openStream()
356 function by the value actually used by the system.
358 The \c streamName parameter can be used to set the client name
359 when using the Jack API. By default, the client name is set to
360 RtApiJack. However, if you wish to create multiple instances of
361 RtAudio with Jack, each instance must have a unique client name.
363 struct StreamOptions {
364 RtAudioStreamFlags flags; /*!< A bit-mask of stream flags (RTAUDIO_NONINTERLEAVED, RTAUDIO_MINIMIZE_LATENCY, RTAUDIO_HOG_DEVICE, RTAUDIO_ALSA_USE_DEFAULT). */
365 unsigned int numberOfBuffers; /*!< Number of stream buffers. */
366 std::string streamName; /*!< A stream name (currently used only in Jack). */
367 int priority; /*!< Scheduling priority of callback thread (only used with flag RTAUDIO_SCHEDULE_REALTIME). */
369 // Default constructor.
371 : flags(0), numberOfBuffers(0), priority(0) {}
374 //! A static function to determine the current RtAudio version.
375 static std::string getVersion( void );
377 //! A static function to determine the available compiled audio APIs.
379 The values returned in the std::vector can be compared against
380 the enumerated list values. Note that there can be more than one
381 API compiled for certain operating systems.
383 static void getCompiledApi( std::vector<RtAudio::Api> &apis );
385 //! The class constructor.
387 The constructor performs minor initialization tasks. An exception
388 can be thrown if no API support is compiled.
390 If no API argument is specified and multiple API support has been
391 compiled, the default order of use is JACK, ALSA, OSS (Linux
392 systems) and ASIO, DS (Windows systems).
394 RtAudio( RtAudio::Api api=UNSPECIFIED );
398 If a stream is running or open, it will be stopped and closed
403 //! Returns the audio API specifier for the current instance of RtAudio.
404 RtAudio::Api getCurrentApi( void );
406 //! A public function that queries for the number of audio devices available.
408 This function performs a system query of available devices each time it
409 is called, thus supporting devices connected \e after instantiation. If
410 a system error occurs during processing, a warning will be issued.
412 unsigned int getDeviceCount( void );
414 //! Return an RtAudio::DeviceInfo structure for a specified device number.
417 Any device integer between 0 and getDeviceCount() - 1 is valid.
418 If an invalid argument is provided, an RtAudioError (type = INVALID_USE)
419 will be thrown. If a device is busy or otherwise unavailable, the
420 structure member "probed" will have a value of "false" and all
421 other members are undefined. If the specified device is the
422 current default input or output device, the corresponding
423 "isDefault" member will have a value of "true".
425 RtAudio::DeviceInfo getDeviceInfo( unsigned int device );
427 //! A function that returns the index of the default output device.
429 If the underlying audio API does not provide a "default
430 device", or if no devices are available, the return value will be
431 0. Note that this is a valid device identifier and it is the
432 client's responsibility to verify that a device is available
433 before attempting to open a stream.
435 unsigned int getDefaultOutputDevice( void );
437 //! A function that returns the index of the default input device.
439 If the underlying audio API does not provide a "default
440 device", or if no devices are available, the return value will be
441 0. Note that this is a valid device identifier and it is the
442 client's responsibility to verify that a device is available
443 before attempting to open a stream.
445 unsigned int getDefaultInputDevice( void );
447 //! A public function for opening a stream with the specified parameters.
449 An RtAudioError (type = SYSTEM_ERROR) is thrown if a stream cannot be
450 opened with the specified parameters or an error occurs during
451 processing. An RtAudioError (type = INVALID_USE) is thrown if any
452 invalid device ID or channel number parameters are specified.
454 \param outputParameters Specifies output stream parameters to use
455 when opening a stream, including a device ID, number of channels,
456 and starting channel number. For input-only streams, this
457 argument should be NULL. The device ID is an index value between
458 0 and getDeviceCount() - 1.
459 \param inputParameters Specifies input stream parameters to use
460 when opening a stream, including a device ID, number of channels,
461 and starting channel number. For output-only streams, this
462 argument should be NULL. The device ID is an index value between
463 0 and getDeviceCount() - 1.
464 \param format An RtAudioFormat specifying the desired sample data format.
465 \param sampleRate The desired sample rate (sample frames per second).
466 \param *bufferFrames A pointer to a value indicating the desired
467 internal buffer size in sample frames. The actual value
468 used by the device is returned via the same pointer. A
469 value of zero can be specified, in which case the lowest
470 allowable value is determined.
471 \param callback A client-defined function that will be invoked
472 when input data is available and/or output data is needed.
473 \param userData An optional pointer to data that can be accessed
474 from within the callback function.
475 \param options An optional pointer to a structure containing various
476 global stream options, including a list of OR'ed RtAudioStreamFlags
477 and a suggested number of stream buffers that can be used to
478 control stream latency. More buffers typically result in more
479 robust performance, though at a cost of greater latency. If a
480 value of zero is specified, a system-specific median value is
481 chosen. If the RTAUDIO_MINIMIZE_LATENCY flag bit is set, the
482 lowest allowable value is used. The actual value used is
483 returned via the structure argument. The parameter is API dependent.
484 \param errorCallback A client-defined function that will be invoked
485 when an error has occured.
487 void openStream( RtAudio::StreamParameters *outputParameters,
488 RtAudio::StreamParameters *inputParameters,
489 RtAudioFormat format, unsigned int sampleRate,
490 unsigned int *bufferFrames, RtAudioCallback callback,
491 void *userData = NULL, RtAudio::StreamOptions *options = NULL, RtAudioErrorCallback errorCallback = NULL );
493 //! A function that closes a stream and frees any associated stream memory.
495 If a stream is not open, this function issues a warning and
496 returns (no exception is thrown).
498 void closeStream( void );
500 //! A function that starts a stream.
502 An RtAudioError (type = SYSTEM_ERROR) is thrown if an error occurs
503 during processing. An RtAudioError (type = INVALID_USE) is thrown if a
504 stream is not open. A warning is issued if the stream is already
507 void startStream( void );
509 //! Stop a stream, allowing any samples remaining in the output queue to be played.
511 An RtAudioError (type = SYSTEM_ERROR) is thrown if an error occurs
512 during processing. An RtAudioError (type = INVALID_USE) is thrown if a
513 stream is not open. A warning is issued if the stream is already
516 void stopStream( void );
518 //! Stop a stream, discarding any samples remaining in the input/output queue.
520 An RtAudioError (type = SYSTEM_ERROR) is thrown if an error occurs
521 during processing. An RtAudioError (type = INVALID_USE) is thrown if a
522 stream is not open. A warning is issued if the stream is already
525 void abortStream( void );
527 //! Returns true if a stream is open and false if not.
528 bool isStreamOpen( void ) const;
530 //! Returns true if the stream is running and false if it is stopped or not open.
531 bool isStreamRunning( void ) const;
533 //! Returns the number of elapsed seconds since the stream was started.
535 If a stream is not open, an RtAudioError (type = INVALID_USE) will be thrown.
537 double getStreamTime( void );
539 //! Set the stream time to a time in seconds greater than or equal to 0.0.
541 If a stream is not open, an RtAudioError (type = INVALID_USE) will be thrown.
543 void setStreamTime( double time );
545 //! Returns the internal stream latency in sample frames.
547 The stream latency refers to delay in audio input and/or output
548 caused by internal buffering by the audio system and/or hardware.
549 For duplex streams, the returned value will represent the sum of
550 the input and output latencies. If a stream is not open, an
551 RtAudioError (type = INVALID_USE) will be thrown. If the API does not
552 report latency, the return value will be zero.
554 long getStreamLatency( void );
556 //! Returns actual sample rate in use by the stream.
558 On some systems, the sample rate used may be slightly different
559 than that specified in the stream parameters. If a stream is not
560 open, an RtAudioError (type = INVALID_USE) will be thrown.
562 unsigned int getStreamSampleRate( void );
564 //! Specify whether warning messages should be printed to stderr.
565 void showWarnings( bool value = true );
569 void openRtApi( RtAudio::Api api );
573 // Operating system dependent thread functionality.
574 #if defined(__WINDOWS_DS__) || defined(__WINDOWS_ASIO__) || defined(__WINDOWS_WASAPI__)
582 typedef uintptr_t ThreadHandle;
583 typedef CRITICAL_SECTION StreamMutex;
585 #elif defined(__LINUX_ALSA__) || defined(__LINUX_PULSE__) || defined(__UNIX_JACK__) || defined(__LINUX_OSS__) || defined(__MACOSX_CORE__)
586 // Using pthread library for various flavors of unix.
589 typedef pthread_t ThreadHandle;
590 typedef pthread_mutex_t StreamMutex;
592 #else // Setup for "dummy" behavior
594 #define __RTAUDIO_DUMMY__
595 typedef int ThreadHandle;
596 typedef int StreamMutex;
600 // This global structure type is used to pass callback information
601 // between the private RtAudio stream structure and global callback
602 // handling functions.
603 struct CallbackInfo {
604 void *object; // Used as a "this" pointer.
609 void *apiInfo; // void pointer for API specific callback information
614 // Default constructor.
616 :object(0), callback(0), userData(0), errorCallback(0), apiInfo(0), isRunning(false), doRealtime(false), priority(0) {}
619 // **************************************************************** //
621 // RtApi class declaration.
623 // Subclasses of RtApi contain all API- and OS-specific code necessary
624 // to fully implement the RtAudio API.
626 // Note that RtApi is an abstract base class and cannot be
627 // explicitly instantiated. The class RtAudio will create an
628 // instance of an RtApi subclass (RtApiOss, RtApiAlsa,
629 // RtApiJack, RtApiCore, RtApiDs, or RtApiAsio).
631 // **************************************************************** //
633 #pragma pack(push, 1)
642 S24& operator = ( const int& i ) {
643 c3[0] = (i & 0x000000ff);
644 c3[1] = (i & 0x0000ff00) >> 8;
645 c3[2] = (i & 0x00ff0000) >> 16;
649 S24( const S24& v ) { *this = v; }
650 S24( const double& d ) { *this = (int) d; }
651 S24( const float& f ) { *this = (int) f; }
652 S24( const signed short& s ) { *this = (int) s; }
653 S24( const char& c ) { *this = (int) c; }
656 int i = c3[0] | (c3[1] << 8) | (c3[2] << 16);
657 if (i & 0x800000) i |= ~0xffffff;
663 #if defined( HAVE_GETTIMEOFDAY )
664 #include <sys/time.h>
675 virtual RtAudio::Api getCurrentApi( void ) = 0;
676 virtual unsigned int getDeviceCount( void ) = 0;
677 virtual RtAudio::DeviceInfo getDeviceInfo( unsigned int device ) = 0;
678 virtual unsigned int getDefaultInputDevice( void );
679 virtual unsigned int getDefaultOutputDevice( void );
680 void openStream( RtAudio::StreamParameters *outputParameters,
681 RtAudio::StreamParameters *inputParameters,
682 RtAudioFormat format, unsigned int sampleRate,
683 unsigned int *bufferFrames, RtAudioCallback callback,
684 void *userData, RtAudio::StreamOptions *options,
685 RtAudioErrorCallback errorCallback );
686 virtual void closeStream( void );
687 virtual void startStream( void ) = 0;
688 virtual void stopStream( void ) = 0;
689 virtual void abortStream( void ) = 0;
690 long getStreamLatency( void );
691 unsigned int getStreamSampleRate( void );
692 virtual double getStreamTime( void );
693 virtual void setStreamTime( double time );
694 bool isStreamOpen( void ) const { return stream_.state != STREAM_CLOSED; }
695 bool isStreamRunning( void ) const { return stream_.state == STREAM_RUNNING; }
696 void showWarnings( bool value ) { showWarnings_ = value; }
701 static const unsigned int MAX_SAMPLE_RATES;
702 static const unsigned int SAMPLE_RATES[];
704 enum { FAILURE, SUCCESS };
720 // A protected structure used for buffer conversion.
724 RtAudioFormat inFormat, outFormat;
725 std::vector<int> inOffset;
726 std::vector<int> outOffset;
729 // A protected structure for audio streams.
731 unsigned int device[2]; // Playback and record, respectively.
732 void *apiHandle; // void pointer for API specific stream handle information
733 StreamMode mode; // OUTPUT, INPUT, or DUPLEX.
734 StreamState state; // STOPPED, RUNNING, or CLOSED
735 char *userBuffer[2]; // Playback and record, respectively.
737 bool doConvertBuffer[2]; // Playback and record, respectively.
738 bool userInterleaved;
739 bool deviceInterleaved[2]; // Playback and record, respectively.
740 bool doByteSwap[2]; // Playback and record, respectively.
741 unsigned int sampleRate;
742 unsigned int bufferSize;
743 unsigned int nBuffers;
744 unsigned int nUserChannels[2]; // Playback and record, respectively.
745 unsigned int nDeviceChannels[2]; // Playback and record channels, respectively.
746 unsigned int channelOffset[2]; // Playback and record, respectively.
747 unsigned long latency[2]; // Playback and record, respectively.
748 RtAudioFormat userFormat;
749 RtAudioFormat deviceFormat[2]; // Playback and record, respectively.
751 CallbackInfo callbackInfo;
752 ConvertInfo convertInfo[2];
753 double streamTime; // Number of elapsed seconds since the stream started.
755 #if defined(HAVE_GETTIMEOFDAY)
756 struct timeval lastTickTimestamp;
760 :apiHandle(0), deviceBuffer(0) { device[0] = 11111; device[1] = 11111; }
764 typedef signed short Int16;
765 typedef signed int Int32;
766 typedef float Float32;
767 typedef double Float64;
769 std::ostringstream errorStream_;
770 std::string errorText_;
773 bool firstErrorOccurred_;
776 Protected, api-specific method that attempts to open a device
777 with the given parameters. This function MUST be implemented by
778 all subclasses. If an error is encountered during the probe, a
779 "warning" message is reported and FAILURE is returned. A
780 successful probe is indicated by a return value of SUCCESS.
782 virtual bool probeDeviceOpen( unsigned int device, StreamMode mode, unsigned int channels,
783 unsigned int firstChannel, unsigned int sampleRate,
784 RtAudioFormat format, unsigned int *bufferSize,
785 RtAudio::StreamOptions *options );
787 //! A protected function used to increment the stream time.
788 void tickStreamTime( void );
790 //! Protected common method to clear an RtApiStream structure.
791 void clearStreamInfo();
794 Protected common method that throws an RtAudioError (type =
795 INVALID_USE) if a stream is not open.
797 void verifyStream( void );
799 //! Protected common error method to allow global control over error handling.
800 void error( RtAudioError::Type type );
803 Protected method used to perform format, channel number, and/or interleaving
804 conversions between the user and device buffers.
806 void convertBuffer( char *outBuffer, char *inBuffer, ConvertInfo &info );
808 //! Protected common method used to perform byte-swapping on buffers.
809 void byteSwapBuffer( char *buffer, unsigned int samples, RtAudioFormat format );
811 //! Protected common method that returns the number of bytes for a given format.
812 unsigned int formatBytes( RtAudioFormat format );
814 //! Protected common method that sets up the parameters for buffer conversion.
815 void setConvertInfo( StreamMode mode, unsigned int firstChannel );
818 // **************************************************************** //
820 // Inline RtAudio definitions.
822 // **************************************************************** //
824 inline RtAudio::Api RtAudio :: getCurrentApi( void ) { return rtapi_->getCurrentApi(); }
825 inline unsigned int RtAudio :: getDeviceCount( void ) { return rtapi_->getDeviceCount(); }
826 inline RtAudio::DeviceInfo RtAudio :: getDeviceInfo( unsigned int device ) { return rtapi_->getDeviceInfo( device ); }
827 inline unsigned int RtAudio :: getDefaultInputDevice( void ) { return rtapi_->getDefaultInputDevice(); }
828 inline unsigned int RtAudio :: getDefaultOutputDevice( void ) { return rtapi_->getDefaultOutputDevice(); }
829 inline void RtAudio :: closeStream( void ) { return rtapi_->closeStream(); }
830 inline void RtAudio :: startStream( void ) { return rtapi_->startStream(); }
831 inline void RtAudio :: stopStream( void ) { return rtapi_->stopStream(); }
832 inline void RtAudio :: abortStream( void ) { return rtapi_->abortStream(); }
833 inline bool RtAudio :: isStreamOpen( void ) const { return rtapi_->isStreamOpen(); }
834 inline bool RtAudio :: isStreamRunning( void ) const { return rtapi_->isStreamRunning(); }
835 inline long RtAudio :: getStreamLatency( void ) { return rtapi_->getStreamLatency(); }
836 inline unsigned int RtAudio :: getStreamSampleRate( void ) { return rtapi_->getStreamSampleRate(); }
837 inline double RtAudio :: getStreamTime( void ) { return rtapi_->getStreamTime(); }
838 inline void RtAudio :: setStreamTime( double time ) { return rtapi_->setStreamTime( time ); }
839 inline void RtAudio :: showWarnings( bool value ) { rtapi_->showWarnings( value ); }
841 // RtApi Subclass prototypes.
843 #if defined(__MACOSX_CORE__)
845 #include <CoreAudio/AudioHardware.h>
847 class RtApiCore: public RtApi
853 RtAudio::Api getCurrentApi( void ) { return RtAudio::MACOSX_CORE; }
854 unsigned int getDeviceCount( void );
855 RtAudio::DeviceInfo getDeviceInfo( unsigned int device );
856 unsigned int getDefaultOutputDevice( void );
857 unsigned int getDefaultInputDevice( void );
858 void closeStream( void );
859 void startStream( void );
860 void stopStream( void );
861 void abortStream( void );
862 long getStreamLatency( void );
864 // This function is intended for internal use only. It must be
865 // public because it is called by the internal callback handler,
866 // which is not a member of RtAudio. External use of this function
867 // will most likely produce highly undesireable results!
868 bool callbackEvent( AudioDeviceID deviceId,
869 const AudioBufferList *inBufferList,
870 const AudioBufferList *outBufferList );
874 bool probeDeviceOpen( unsigned int device, StreamMode mode, unsigned int channels,
875 unsigned int firstChannel, unsigned int sampleRate,
876 RtAudioFormat format, unsigned int *bufferSize,
877 RtAudio::StreamOptions *options );
878 static const char* getErrorCode( OSStatus code );
883 #if defined(__UNIX_JACK__)
885 class RtApiJack: public RtApi
891 RtAudio::Api getCurrentApi( void ) { return RtAudio::UNIX_JACK; }
892 unsigned int getDeviceCount( void );
893 RtAudio::DeviceInfo getDeviceInfo( unsigned int device );
894 void closeStream( void );
895 void startStream( void );
896 void stopStream( void );
897 void abortStream( void );
898 long getStreamLatency( void );
900 // This function is intended for internal use only. It must be
901 // public because it is called by the internal callback handler,
902 // which is not a member of RtAudio. External use of this function
903 // will most likely produce highly undesireable results!
904 bool callbackEvent( unsigned long nframes );
908 bool probeDeviceOpen( unsigned int device, StreamMode mode, unsigned int channels,
909 unsigned int firstChannel, unsigned int sampleRate,
910 RtAudioFormat format, unsigned int *bufferSize,
911 RtAudio::StreamOptions *options );
916 #if defined(__WINDOWS_ASIO__)
918 class RtApiAsio: public RtApi
924 RtAudio::Api getCurrentApi( void ) { return RtAudio::WINDOWS_ASIO; }
925 unsigned int getDeviceCount( void );
926 RtAudio::DeviceInfo getDeviceInfo( unsigned int device );
927 void closeStream( void );
928 void startStream( void );
929 void stopStream( void );
930 void abortStream( void );
931 long getStreamLatency( void );
933 // This function is intended for internal use only. It must be
934 // public because it is called by the internal callback handler,
935 // which is not a member of RtAudio. External use of this function
936 // will most likely produce highly undesireable results!
937 bool callbackEvent( long bufferIndex );
941 std::vector<RtAudio::DeviceInfo> devices_;
942 void saveDeviceInfo( void );
944 bool probeDeviceOpen( unsigned int device, StreamMode mode, unsigned int channels,
945 unsigned int firstChannel, unsigned int sampleRate,
946 RtAudioFormat format, unsigned int *bufferSize,
947 RtAudio::StreamOptions *options );
952 #if defined(__WINDOWS_DS__)
954 class RtApiDs: public RtApi
960 RtAudio::Api getCurrentApi( void ) { return RtAudio::WINDOWS_DS; }
961 unsigned int getDeviceCount( void );
962 unsigned int getDefaultOutputDevice( void );
963 unsigned int getDefaultInputDevice( void );
964 RtAudio::DeviceInfo getDeviceInfo( unsigned int device );
965 void closeStream( void );
966 void startStream( void );
967 void stopStream( void );
968 void abortStream( void );
969 long getStreamLatency( void );
971 // This function is intended for internal use only. It must be
972 // public because it is called by the internal callback handler,
973 // which is not a member of RtAudio. External use of this function
974 // will most likely produce highly undesireable results!
975 void callbackEvent( void );
981 long duplexPrerollBytes;
982 std::vector<struct DsDevice> dsDevices;
983 bool probeDeviceOpen( unsigned int device, StreamMode mode, unsigned int channels,
984 unsigned int firstChannel, unsigned int sampleRate,
985 RtAudioFormat format, unsigned int *bufferSize,
986 RtAudio::StreamOptions *options );
991 #if defined(__WINDOWS_WASAPI__)
993 struct IMMDeviceEnumerator;
995 class RtApiWasapi : public RtApi
1001 RtAudio::Api getCurrentApi( void ) { return RtAudio::WINDOWS_WASAPI; }
1002 unsigned int getDeviceCount( void );
1003 RtAudio::DeviceInfo getDeviceInfo( unsigned int device );
1004 unsigned int getDefaultOutputDevice( void );
1005 unsigned int getDefaultInputDevice( void );
1006 void closeStream( void );
1007 void startStream( void );
1008 void stopStream( void );
1009 void abortStream( void );
1012 bool coInitialized_;
1013 IMMDeviceEnumerator* deviceEnumerator_;
1015 bool probeDeviceOpen( unsigned int device, StreamMode mode, unsigned int channels,
1016 unsigned int firstChannel, unsigned int sampleRate,
1017 RtAudioFormat format, unsigned int* bufferSize,
1018 RtAudio::StreamOptions* options );
1020 static DWORD WINAPI runWasapiThread( void* wasapiPtr );
1021 static DWORD WINAPI stopWasapiThread( void* wasapiPtr );
1022 static DWORD WINAPI abortWasapiThread( void* wasapiPtr );
1023 void wasapiThread();
1028 #if defined(__LINUX_ALSA__)
1030 class RtApiAlsa: public RtApi
1036 RtAudio::Api getCurrentApi() { return RtAudio::LINUX_ALSA; }
1037 unsigned int getDeviceCount( void );
1038 RtAudio::DeviceInfo getDeviceInfo( unsigned int device );
1039 void closeStream( void );
1040 void startStream( void );
1041 void stopStream( void );
1042 void abortStream( void );
1044 // This function is intended for internal use only. It must be
1045 // public because it is called by the internal callback handler,
1046 // which is not a member of RtAudio. External use of this function
1047 // will most likely produce highly undesireable results!
1048 void callbackEvent( void );
1052 std::vector<RtAudio::DeviceInfo> devices_;
1053 void saveDeviceInfo( void );
1054 bool probeDeviceOpen( unsigned int device, StreamMode mode, unsigned int channels,
1055 unsigned int firstChannel, unsigned int sampleRate,
1056 RtAudioFormat format, unsigned int *bufferSize,
1057 RtAudio::StreamOptions *options );
1062 #if defined(__LINUX_PULSE__)
1064 class RtApiPulse: public RtApi
1068 RtAudio::Api getCurrentApi() { return RtAudio::LINUX_PULSE; }
1069 unsigned int getDeviceCount( void );
1070 RtAudio::DeviceInfo getDeviceInfo( unsigned int device );
1071 void closeStream( void );
1072 void startStream( void );
1073 void stopStream( void );
1074 void abortStream( void );
1076 // This function is intended for internal use only. It must be
1077 // public because it is called by the internal callback handler,
1078 // which is not a member of RtAudio. External use of this function
1079 // will most likely produce highly undesireable results!
1080 void callbackEvent( void );
1084 std::vector<RtAudio::DeviceInfo> devices_;
1085 void saveDeviceInfo( void );
1086 bool probeDeviceOpen( unsigned int device, StreamMode mode, unsigned int channels,
1087 unsigned int firstChannel, unsigned int sampleRate,
1088 RtAudioFormat format, unsigned int *bufferSize,
1089 RtAudio::StreamOptions *options );
1094 #if defined(__LINUX_OSS__)
1096 class RtApiOss: public RtApi
1102 RtAudio::Api getCurrentApi() { return RtAudio::LINUX_OSS; }
1103 unsigned int getDeviceCount( void );
1104 RtAudio::DeviceInfo getDeviceInfo( unsigned int device );
1105 void closeStream( void );
1106 void startStream( void );
1107 void stopStream( void );
1108 void abortStream( void );
1110 // This function is intended for internal use only. It must be
1111 // public because it is called by the internal callback handler,
1112 // which is not a member of RtAudio. External use of this function
1113 // will most likely produce highly undesireable results!
1114 void callbackEvent( void );
1118 bool probeDeviceOpen( unsigned int device, StreamMode mode, unsigned int channels,
1119 unsigned int firstChannel, unsigned int sampleRate,
1120 RtAudioFormat format, unsigned int *bufferSize,
1121 RtAudio::StreamOptions *options );
1126 #if defined(__RTAUDIO_DUMMY__)
1128 class RtApiDummy: public RtApi
1132 RtApiDummy() { errorText_ = "RtApiDummy: This class provides no functionality."; error( RtAudioError::WARNING ); }
1133 RtAudio::Api getCurrentApi( void ) { return RtAudio::RTAUDIO_DUMMY; }
1134 unsigned int getDeviceCount( void ) { return 0; }
1135 RtAudio::DeviceInfo getDeviceInfo( unsigned int /*device*/ ) { RtAudio::DeviceInfo info; return info; }
1136 void closeStream( void ) {}
1137 void startStream( void ) {}
1138 void stopStream( void ) {}
1139 void abortStream( void ) {}
1143 bool probeDeviceOpen( unsigned int /*device*/, StreamMode /*mode*/, unsigned int /*channels*/,
1144 unsigned int /*firstChannel*/, unsigned int /*sampleRate*/,
1145 RtAudioFormat /*format*/, unsigned int * /*bufferSize*/,
1146 RtAudio::StreamOptions * /*options*/ ) { return false; }
1153 // Indentation settings for Vim and Emacs
1156 // c-basic-offset: 2
1157 // indent-tabs-mode: nil
1160 // vim: et sts=2 sw=2