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) 2001-2014 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 "4.1.1"
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::exception
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, Type type = RtAudioError::UNSPECIFIED ) throw() : message_(message), type_(type) {}
220 virtual ~RtAudioError( void ) throw() {}
222 //! Prints thrown error message to stderr.
223 virtual void printMessage( void ) const throw() { std::cerr << '\n' << message_ << "\n\n"; }
225 //! Returns the thrown error message type.
226 virtual const Type& getType(void) const throw() { return type_; }
228 //! Returns the thrown error message string.
229 virtual const std::string& getMessage(void) const throw() { return message_; }
231 //! Returns the thrown error message as a c-style string.
232 virtual const char* what( void ) const throw() { return message_.c_str(); }
235 std::string message_;
239 //! RtAudio error callback function prototype.
241 \param type Type of error.
242 \param errorText Error description.
244 typedef void (*RtAudioErrorCallback)( RtAudioError::Type type, const std::string &errorText );
246 // **************************************************************** //
248 // RtAudio class declaration.
250 // RtAudio is a "controller" used to select an available audio i/o
251 // interface. It presents a common API for the user to call but all
252 // functionality is implemented by the class RtApi and its
253 // subclasses. RtAudio creates an instance of an RtApi subclass
254 // based on the user's API choice. If no choice is made, RtAudio
255 // attempts to make a "logical" API selection.
257 // **************************************************************** //
265 //! Audio API specifier arguments.
267 UNSPECIFIED, /*!< Search for a working compiled API. */
268 LINUX_ALSA, /*!< The Advanced Linux Sound Architecture API. */
269 LINUX_PULSE, /*!< The Linux PulseAudio API. */
270 LINUX_OSS, /*!< The Linux Open Sound System API. */
271 UNIX_JACK, /*!< The Jack Low-Latency Audio Server API. */
272 MACOSX_CORE, /*!< Macintosh OS-X Core Audio API. */
273 WINDOWS_WASAPI, /*!< The Microsoft WASAPI API. */
274 WINDOWS_ASIO, /*!< The Steinberg Audio Stream I/O API. */
275 WINDOWS_DS, /*!< The Microsoft Direct Sound API. */
276 RTAUDIO_DUMMY /*!< A compilable but non-functional API. */
279 //! The public device information structure for returning queried values.
281 bool probed; /*!< true if the device capabilities were successfully probed. */
282 std::string name; /*!< Character string device identifier. */
283 unsigned int outputChannels; /*!< Maximum output channels supported by device. */
284 unsigned int inputChannels; /*!< Maximum input channels supported by device. */
285 unsigned int duplexChannels; /*!< Maximum simultaneous input/output channels supported by device. */
286 bool isDefaultOutput; /*!< true if this is the default output device. */
287 bool isDefaultInput; /*!< true if this is the default input device. */
288 std::vector<unsigned int> sampleRates; /*!< Supported sample rates (queried from list of standard rates). */
289 RtAudioFormat nativeFormats; /*!< Bit mask of supported data formats. */
291 // Default constructor.
293 :probed(false), outputChannels(0), inputChannels(0), duplexChannels(0),
294 isDefaultOutput(false), isDefaultInput(false), nativeFormats(0) {}
297 //! The structure for specifying input or ouput stream parameters.
298 struct StreamParameters {
299 unsigned int deviceId; /*!< Device index (0 to getDeviceCount() - 1). */
300 unsigned int nChannels; /*!< Number of channels. */
301 unsigned int firstChannel; /*!< First channel index on device (default = 0). */
303 // Default constructor.
305 : deviceId(0), nChannels(0), firstChannel(0) {}
308 //! The structure for specifying stream options.
310 The following flags can be OR'ed together to allow a client to
311 make changes to the default stream behavior:
313 - \e RTAUDIO_NONINTERLEAVED: Use non-interleaved buffers (default = interleaved).
314 - \e RTAUDIO_MINIMIZE_LATENCY: Attempt to set stream parameters for lowest possible latency.
315 - \e RTAUDIO_HOG_DEVICE: Attempt grab device for exclusive use.
316 - \e RTAUDIO_SCHEDULE_REALTIME: Attempt to select realtime scheduling for callback thread.
317 - \e RTAUDIO_ALSA_USE_DEFAULT: Use the "default" PCM device (ALSA only).
319 By default, RtAudio streams pass and receive audio data from the
320 client in an interleaved format. By passing the
321 RTAUDIO_NONINTERLEAVED flag to the openStream() function, audio
322 data will instead be presented in non-interleaved buffers. In
323 this case, each buffer argument in the RtAudioCallback function
324 will point to a single array of data, with \c nFrames samples for
325 each channel concatenated back-to-back. For example, the first
326 sample of data for the second channel would be located at index \c
327 nFrames (assuming the \c buffer pointer was recast to the correct
328 data type for the stream).
330 Certain audio APIs offer a number of parameters that influence the
331 I/O latency of a stream. By default, RtAudio will attempt to set
332 these parameters internally for robust (glitch-free) performance
333 (though some APIs, like Windows Direct Sound, make this difficult).
334 By passing the RTAUDIO_MINIMIZE_LATENCY flag to the openStream()
335 function, internal stream settings will be influenced in an attempt
336 to minimize stream latency, though possibly at the expense of stream
339 If the RTAUDIO_HOG_DEVICE flag is set, RtAudio will attempt to
340 open the input and/or output stream device(s) for exclusive use.
341 Note that this is not possible with all supported audio APIs.
343 If the RTAUDIO_SCHEDULE_REALTIME flag is set, RtAudio will attempt
344 to select realtime scheduling (round-robin) for the callback thread.
345 The \c priority parameter will only be used if the RTAUDIO_SCHEDULE_REALTIME
346 flag is set. It defines the thread's realtime priority.
348 If the RTAUDIO_ALSA_USE_DEFAULT flag is set, RtAudio will attempt to
349 open the "default" PCM device when using the ALSA API. Note that this
350 will override any specified input or output device id.
352 The \c numberOfBuffers parameter can be used to control stream
353 latency in the Windows DirectSound, Linux OSS, and Linux Alsa APIs
354 only. A value of two is usually the smallest allowed. Larger
355 numbers can potentially result in more robust stream performance,
356 though likely at the cost of stream latency. The value set by the
357 user is replaced during execution of the RtAudio::openStream()
358 function by the value actually used by the system.
360 The \c streamName parameter can be used to set the client name
361 when using the Jack API. By default, the client name is set to
362 RtApiJack. However, if you wish to create multiple instances of
363 RtAudio with Jack, each instance must have a unique client name.
365 struct StreamOptions {
366 RtAudioStreamFlags flags; /*!< A bit-mask of stream flags (RTAUDIO_NONINTERLEAVED, RTAUDIO_MINIMIZE_LATENCY, RTAUDIO_HOG_DEVICE, RTAUDIO_ALSA_USE_DEFAULT). */
367 unsigned int numberOfBuffers; /*!< Number of stream buffers. */
368 std::string streamName; /*!< A stream name (currently used only in Jack). */
369 int priority; /*!< Scheduling priority of callback thread (only used with flag RTAUDIO_SCHEDULE_REALTIME). */
371 // Default constructor.
373 : flags(0), numberOfBuffers(0), priority(0) {}
376 //! A static function to determine the current RtAudio version.
377 static std::string getVersion( void ) throw();
379 //! A static function to determine the available compiled audio APIs.
381 The values returned in the std::vector can be compared against
382 the enumerated list values. Note that there can be more than one
383 API compiled for certain operating systems.
385 static void getCompiledApi( std::vector<RtAudio::Api> &apis ) throw();
387 //! The class constructor.
389 The constructor performs minor initialization tasks. An exception
390 can be thrown if no API support is compiled.
392 If no API argument is specified and multiple API support has been
393 compiled, the default order of use is JACK, ALSA, OSS (Linux
394 systems) and ASIO, DS (Windows systems).
396 RtAudio( RtAudio::Api api=UNSPECIFIED );
400 If a stream is running or open, it will be stopped and closed
405 //! Returns the audio API specifier for the current instance of RtAudio.
406 RtAudio::Api getCurrentApi( void ) throw();
408 //! A public function that queries for the number of audio devices available.
410 This function performs a system query of available devices each time it
411 is called, thus supporting devices connected \e after instantiation. If
412 a system error occurs during processing, a warning will be issued.
414 unsigned int getDeviceCount( void ) throw();
416 //! Return an RtAudio::DeviceInfo structure for a specified device number.
419 Any device integer between 0 and getDeviceCount() - 1 is valid.
420 If an invalid argument is provided, an RtAudioError (type = INVALID_USE)
421 will be thrown. If a device is busy or otherwise unavailable, the
422 structure member "probed" will have a value of "false" and all
423 other members are undefined. If the specified device is the
424 current default input or output device, the corresponding
425 "isDefault" member will have a value of "true".
427 RtAudio::DeviceInfo getDeviceInfo( unsigned int device );
429 //! A function that returns the index of the default output device.
431 If the underlying audio API does not provide a "default
432 device", or if no devices are available, the return value will be
433 0. Note that this is a valid device identifier and it is the
434 client's responsibility to verify that a device is available
435 before attempting to open a stream.
437 unsigned int getDefaultOutputDevice( void ) throw();
439 //! A function that returns the index of the default input device.
441 If the underlying audio API does not provide a "default
442 device", or if no devices are available, the return value will be
443 0. Note that this is a valid device identifier and it is the
444 client's responsibility to verify that a device is available
445 before attempting to open a stream.
447 unsigned int getDefaultInputDevice( void ) throw();
449 //! A public function for opening a stream with the specified parameters.
451 An RtAudioError (type = SYSTEM_ERROR) is thrown if a stream cannot be
452 opened with the specified parameters or an error occurs during
453 processing. An RtAudioError (type = INVALID_USE) is thrown if any
454 invalid device ID or channel number parameters are specified.
456 \param outputParameters Specifies output stream parameters to use
457 when opening a stream, including a device ID, number of channels,
458 and starting channel number. For input-only streams, this
459 argument should be NULL. The device ID is an index value between
460 0 and getDeviceCount() - 1.
461 \param inputParameters Specifies input stream parameters to use
462 when opening a stream, including a device ID, number of channels,
463 and starting channel number. For output-only streams, this
464 argument should be NULL. The device ID is an index value between
465 0 and getDeviceCount() - 1.
466 \param format An RtAudioFormat specifying the desired sample data format.
467 \param sampleRate The desired sample rate (sample frames per second).
468 \param *bufferFrames A pointer to a value indicating the desired
469 internal buffer size in sample frames. The actual value
470 used by the device is returned via the same pointer. A
471 value of zero can be specified, in which case the lowest
472 allowable value is determined.
473 \param callback A client-defined function that will be invoked
474 when input data is available and/or output data is needed.
475 \param userData An optional pointer to data that can be accessed
476 from within the callback function.
477 \param options An optional pointer to a structure containing various
478 global stream options, including a list of OR'ed RtAudioStreamFlags
479 and a suggested number of stream buffers that can be used to
480 control stream latency. More buffers typically result in more
481 robust performance, though at a cost of greater latency. If a
482 value of zero is specified, a system-specific median value is
483 chosen. If the RTAUDIO_MINIMIZE_LATENCY flag bit is set, the
484 lowest allowable value is used. The actual value used is
485 returned via the structure argument. The parameter is API dependent.
486 \param errorCallback A client-defined function that will be invoked
487 when an error has occured.
489 void openStream( RtAudio::StreamParameters *outputParameters,
490 RtAudio::StreamParameters *inputParameters,
491 RtAudioFormat format, unsigned int sampleRate,
492 unsigned int *bufferFrames, RtAudioCallback callback,
493 void *userData = NULL, RtAudio::StreamOptions *options = NULL, RtAudioErrorCallback errorCallback = NULL );
495 //! A function that closes a stream and frees any associated stream memory.
497 If a stream is not open, this function issues a warning and
498 returns (no exception is thrown).
500 void closeStream( void ) throw();
502 //! A function that starts a stream.
504 An RtAudioError (type = SYSTEM_ERROR) is thrown if an error occurs
505 during processing. An RtAudioError (type = INVALID_USE) is thrown if a
506 stream is not open. A warning is issued if the stream is already
509 void startStream( void );
511 //! Stop a stream, allowing any samples remaining in the output queue to be played.
513 An RtAudioError (type = SYSTEM_ERROR) is thrown if an error occurs
514 during processing. An RtAudioError (type = INVALID_USE) is thrown if a
515 stream is not open. A warning is issued if the stream is already
518 void stopStream( void );
520 //! Stop a stream, discarding any samples remaining in the input/output queue.
522 An RtAudioError (type = SYSTEM_ERROR) is thrown if an error occurs
523 during processing. An RtAudioError (type = INVALID_USE) is thrown if a
524 stream is not open. A warning is issued if the stream is already
527 void abortStream( void );
529 //! Returns true if a stream is open and false if not.
530 bool isStreamOpen( void ) const throw();
532 //! Returns true if the stream is running and false if it is stopped or not open.
533 bool isStreamRunning( void ) const throw();
535 //! Returns the number of elapsed seconds since the stream was started.
537 If a stream is not open, an RtAudioError (type = INVALID_USE) will be thrown.
539 double getStreamTime( void );
541 //! Set the stream time to a time in seconds greater than or equal to 0.0.
543 If a stream is not open, an RtAudioError (type = INVALID_USE) will be thrown.
545 void setStreamTime( double time );
547 //! Returns the internal stream latency in sample frames.
549 The stream latency refers to delay in audio input and/or output
550 caused by internal buffering by the audio system and/or hardware.
551 For duplex streams, the returned value will represent the sum of
552 the input and output latencies. If a stream is not open, an
553 RtAudioError (type = INVALID_USE) will be thrown. If the API does not
554 report latency, the return value will be zero.
556 long getStreamLatency( void );
558 //! Returns actual sample rate in use by the stream.
560 On some systems, the sample rate used may be slightly different
561 than that specified in the stream parameters. If a stream is not
562 open, an RtAudioError (type = INVALID_USE) will be thrown.
564 unsigned int getStreamSampleRate( void );
566 //! Specify whether warning messages should be printed to stderr.
567 void showWarnings( bool value = true ) throw();
571 void openRtApi( RtAudio::Api api );
575 // Operating system dependent thread functionality.
576 #if defined(__WINDOWS_DS__) || defined(__WINDOWS_ASIO__) || defined(__WINDOWS_WASAPI__)
584 typedef uintptr_t ThreadHandle;
585 typedef CRITICAL_SECTION StreamMutex;
587 #elif defined(__LINUX_ALSA__) || defined(__LINUX_PULSE__) || defined(__UNIX_JACK__) || defined(__LINUX_OSS__) || defined(__MACOSX_CORE__)
588 // Using pthread library for various flavors of unix.
591 typedef pthread_t ThreadHandle;
592 typedef pthread_mutex_t StreamMutex;
594 #else // Setup for "dummy" behavior
596 #define __RTAUDIO_DUMMY__
597 typedef int ThreadHandle;
598 typedef int StreamMutex;
602 // This global structure type is used to pass callback information
603 // between the private RtAudio stream structure and global callback
604 // handling functions.
605 struct CallbackInfo {
606 void *object; // Used as a "this" pointer.
611 void *apiInfo; // void pointer for API specific callback information
616 // Default constructor.
618 :object(0), callback(0), userData(0), errorCallback(0), apiInfo(0), isRunning(false), doRealtime(false) {}
621 // **************************************************************** //
623 // RtApi class declaration.
625 // Subclasses of RtApi contain all API- and OS-specific code necessary
626 // to fully implement the RtAudio API.
628 // Note that RtApi is an abstract base class and cannot be
629 // explicitly instantiated. The class RtAudio will create an
630 // instance of an RtApi subclass (RtApiOss, RtApiAlsa,
631 // RtApiJack, RtApiCore, RtApiDs, or RtApiAsio).
633 // **************************************************************** //
635 #pragma pack(push, 1)
644 S24& operator = ( const int& i ) {
645 c3[0] = (i & 0x000000ff);
646 c3[1] = (i & 0x0000ff00) >> 8;
647 c3[2] = (i & 0x00ff0000) >> 16;
651 S24( const S24& v ) { *this = v; }
652 S24( const double& d ) { *this = (int) d; }
653 S24( const float& f ) { *this = (int) f; }
654 S24( const signed short& s ) { *this = (int) s; }
655 S24( const char& c ) { *this = (int) c; }
658 int i = c3[0] | (c3[1] << 8) | (c3[2] << 16);
659 if (i & 0x800000) i |= ~0xffffff;
665 #if defined( HAVE_GETTIMEOFDAY )
666 #include <sys/time.h>
677 virtual RtAudio::Api getCurrentApi( void ) = 0;
678 virtual unsigned int getDeviceCount( void ) = 0;
679 virtual RtAudio::DeviceInfo getDeviceInfo( unsigned int device ) = 0;
680 virtual unsigned int getDefaultInputDevice( void );
681 virtual unsigned int getDefaultOutputDevice( void );
682 void openStream( RtAudio::StreamParameters *outputParameters,
683 RtAudio::StreamParameters *inputParameters,
684 RtAudioFormat format, unsigned int sampleRate,
685 unsigned int *bufferFrames, RtAudioCallback callback,
686 void *userData, RtAudio::StreamOptions *options,
687 RtAudioErrorCallback errorCallback );
688 virtual void closeStream( void );
689 virtual void startStream( void ) = 0;
690 virtual void stopStream( void ) = 0;
691 virtual void abortStream( void ) = 0;
692 long getStreamLatency( void );
693 unsigned int getStreamSampleRate( void );
694 virtual double getStreamTime( void );
695 virtual void setStreamTime( double time );
696 bool isStreamOpen( void ) const { return stream_.state != STREAM_CLOSED; }
697 bool isStreamRunning( void ) const { return stream_.state == STREAM_RUNNING; }
698 void showWarnings( bool value ) { showWarnings_ = value; }
703 static const unsigned int MAX_SAMPLE_RATES;
704 static const unsigned int SAMPLE_RATES[];
706 enum { FAILURE, SUCCESS };
722 // A protected structure used for buffer conversion.
726 RtAudioFormat inFormat, outFormat;
727 std::vector<int> inOffset;
728 std::vector<int> outOffset;
731 // A protected structure for audio streams.
733 unsigned int device[2]; // Playback and record, respectively.
734 void *apiHandle; // void pointer for API specific stream handle information
735 StreamMode mode; // OUTPUT, INPUT, or DUPLEX.
736 StreamState state; // STOPPED, RUNNING, or CLOSED
737 char *userBuffer[2]; // Playback and record, respectively.
739 bool doConvertBuffer[2]; // Playback and record, respectively.
740 bool userInterleaved;
741 bool deviceInterleaved[2]; // Playback and record, respectively.
742 bool doByteSwap[2]; // Playback and record, respectively.
743 unsigned int sampleRate;
744 unsigned int bufferSize;
745 unsigned int nBuffers;
746 unsigned int nUserChannels[2]; // Playback and record, respectively.
747 unsigned int nDeviceChannels[2]; // Playback and record channels, respectively.
748 unsigned int channelOffset[2]; // Playback and record, respectively.
749 unsigned long latency[2]; // Playback and record, respectively.
750 RtAudioFormat userFormat;
751 RtAudioFormat deviceFormat[2]; // Playback and record, respectively.
753 CallbackInfo callbackInfo;
754 ConvertInfo convertInfo[2];
755 double streamTime; // Number of elapsed seconds since the stream started.
757 #if defined(HAVE_GETTIMEOFDAY)
758 struct timeval lastTickTimestamp;
762 :apiHandle(0), deviceBuffer(0) { device[0] = 11111; device[1] = 11111; }
766 typedef signed short Int16;
767 typedef signed int Int32;
768 typedef float Float32;
769 typedef double Float64;
771 std::ostringstream errorStream_;
772 std::string errorText_;
775 bool firstErrorOccurred_;
778 Protected, api-specific method that attempts to open a device
779 with the given parameters. This function MUST be implemented by
780 all subclasses. If an error is encountered during the probe, a
781 "warning" message is reported and FAILURE is returned. A
782 successful probe is indicated by a return value of SUCCESS.
784 virtual bool probeDeviceOpen( unsigned int device, StreamMode mode, unsigned int channels,
785 unsigned int firstChannel, unsigned int sampleRate,
786 RtAudioFormat format, unsigned int *bufferSize,
787 RtAudio::StreamOptions *options );
789 //! A protected function used to increment the stream time.
790 void tickStreamTime( void );
792 //! Protected common method to clear an RtApiStream structure.
793 void clearStreamInfo();
796 Protected common method that throws an RtAudioError (type =
797 INVALID_USE) if a stream is not open.
799 void verifyStream( void );
801 //! Protected common error method to allow global control over error handling.
802 void error( RtAudioError::Type type );
805 Protected method used to perform format, channel number, and/or interleaving
806 conversions between the user and device buffers.
808 void convertBuffer( char *outBuffer, char *inBuffer, ConvertInfo &info );
810 //! Protected common method used to perform byte-swapping on buffers.
811 void byteSwapBuffer( char *buffer, unsigned int samples, RtAudioFormat format );
813 //! Protected common method that returns the number of bytes for a given format.
814 unsigned int formatBytes( RtAudioFormat format );
816 //! Protected common method that sets up the parameters for buffer conversion.
817 void setConvertInfo( StreamMode mode, unsigned int firstChannel );
820 // **************************************************************** //
822 // Inline RtAudio definitions.
824 // **************************************************************** //
826 inline RtAudio::Api RtAudio :: getCurrentApi( void ) throw() { return rtapi_->getCurrentApi(); }
827 inline unsigned int RtAudio :: getDeviceCount( void ) throw() { return rtapi_->getDeviceCount(); }
828 inline RtAudio::DeviceInfo RtAudio :: getDeviceInfo( unsigned int device ) { return rtapi_->getDeviceInfo( device ); }
829 inline unsigned int RtAudio :: getDefaultInputDevice( void ) throw() { return rtapi_->getDefaultInputDevice(); }
830 inline unsigned int RtAudio :: getDefaultOutputDevice( void ) throw() { return rtapi_->getDefaultOutputDevice(); }
831 inline void RtAudio :: closeStream( void ) throw() { return rtapi_->closeStream(); }
832 inline void RtAudio :: startStream( void ) { return rtapi_->startStream(); }
833 inline void RtAudio :: stopStream( void ) { return rtapi_->stopStream(); }
834 inline void RtAudio :: abortStream( void ) { return rtapi_->abortStream(); }
835 inline bool RtAudio :: isStreamOpen( void ) const throw() { return rtapi_->isStreamOpen(); }
836 inline bool RtAudio :: isStreamRunning( void ) const throw() { return rtapi_->isStreamRunning(); }
837 inline long RtAudio :: getStreamLatency( void ) { return rtapi_->getStreamLatency(); }
838 inline unsigned int RtAudio :: getStreamSampleRate( void ) { return rtapi_->getStreamSampleRate(); }
839 inline double RtAudio :: getStreamTime( void ) { return rtapi_->getStreamTime(); }
840 inline void RtAudio :: setStreamTime( double time ) { return rtapi_->setStreamTime( time ); }
841 inline void RtAudio :: showWarnings( bool value ) throw() { rtapi_->showWarnings( value ); }
843 // RtApi Subclass prototypes.
845 #if defined(__MACOSX_CORE__)
847 #include <CoreAudio/AudioHardware.h>
849 class RtApiCore: public RtApi
855 RtAudio::Api getCurrentApi( void ) { return RtAudio::MACOSX_CORE; }
856 unsigned int getDeviceCount( void );
857 RtAudio::DeviceInfo getDeviceInfo( unsigned int device );
858 unsigned int getDefaultOutputDevice( void );
859 unsigned int getDefaultInputDevice( void );
860 void closeStream( void );
861 void startStream( void );
862 void stopStream( void );
863 void abortStream( void );
864 long getStreamLatency( void );
866 // This function is intended for internal use only. It must be
867 // public because it is called by the internal callback handler,
868 // which is not a member of RtAudio. External use of this function
869 // will most likely produce highly undesireable results!
870 bool callbackEvent( AudioDeviceID deviceId,
871 const AudioBufferList *inBufferList,
872 const AudioBufferList *outBufferList );
876 bool probeDeviceOpen( unsigned int device, StreamMode mode, unsigned int channels,
877 unsigned int firstChannel, unsigned int sampleRate,
878 RtAudioFormat format, unsigned int *bufferSize,
879 RtAudio::StreamOptions *options );
880 static const char* getErrorCode( OSStatus code );
885 #if defined(__UNIX_JACK__)
887 class RtApiJack: public RtApi
893 RtAudio::Api getCurrentApi( void ) { return RtAudio::UNIX_JACK; }
894 unsigned int getDeviceCount( void );
895 RtAudio::DeviceInfo getDeviceInfo( unsigned int device );
896 void closeStream( void );
897 void startStream( void );
898 void stopStream( void );
899 void abortStream( void );
900 long getStreamLatency( void );
902 // This function is intended for internal use only. It must be
903 // public because it is called by the internal callback handler,
904 // which is not a member of RtAudio. External use of this function
905 // will most likely produce highly undesireable results!
906 bool callbackEvent( unsigned long nframes );
910 bool probeDeviceOpen( unsigned int device, StreamMode mode, unsigned int channels,
911 unsigned int firstChannel, unsigned int sampleRate,
912 RtAudioFormat format, unsigned int *bufferSize,
913 RtAudio::StreamOptions *options );
918 #if defined(__WINDOWS_ASIO__)
920 class RtApiAsio: public RtApi
926 RtAudio::Api getCurrentApi( void ) { return RtAudio::WINDOWS_ASIO; }
927 unsigned int getDeviceCount( void );
928 RtAudio::DeviceInfo getDeviceInfo( unsigned int device );
929 void closeStream( void );
930 void startStream( void );
931 void stopStream( void );
932 void abortStream( void );
933 long getStreamLatency( void );
935 // This function is intended for internal use only. It must be
936 // public because it is called by the internal callback handler,
937 // which is not a member of RtAudio. External use of this function
938 // will most likely produce highly undesireable results!
939 bool callbackEvent( long bufferIndex );
943 std::vector<RtAudio::DeviceInfo> devices_;
944 void saveDeviceInfo( void );
946 bool probeDeviceOpen( unsigned int device, StreamMode mode, unsigned int channels,
947 unsigned int firstChannel, unsigned int sampleRate,
948 RtAudioFormat format, unsigned int *bufferSize,
949 RtAudio::StreamOptions *options );
954 #if defined(__WINDOWS_DS__)
956 class RtApiDs: public RtApi
962 RtAudio::Api getCurrentApi( void ) { return RtAudio::WINDOWS_DS; }
963 unsigned int getDeviceCount( void );
964 unsigned int getDefaultOutputDevice( void );
965 unsigned int getDefaultInputDevice( void );
966 RtAudio::DeviceInfo getDeviceInfo( unsigned int device );
967 void closeStream( void );
968 void startStream( void );
969 void stopStream( void );
970 void abortStream( void );
971 long getStreamLatency( void );
973 // This function is intended for internal use only. It must be
974 // public because it is called by the internal callback handler,
975 // which is not a member of RtAudio. External use of this function
976 // will most likely produce highly undesireable results!
977 void callbackEvent( void );
983 long duplexPrerollBytes;
984 std::vector<struct DsDevice> dsDevices;
985 bool probeDeviceOpen( unsigned int device, StreamMode mode, unsigned int channels,
986 unsigned int firstChannel, unsigned int sampleRate,
987 RtAudioFormat format, unsigned int *bufferSize,
988 RtAudio::StreamOptions *options );
993 #if defined(__WINDOWS_WASAPI__)
995 struct IMMDeviceEnumerator;
997 class RtApiWasapi : public RtApi
1003 RtAudio::Api getCurrentApi( void ) { return RtAudio::WINDOWS_WASAPI; }
1004 unsigned int getDeviceCount( void );
1005 RtAudio::DeviceInfo getDeviceInfo( unsigned int device );
1006 unsigned int getDefaultOutputDevice( void );
1007 unsigned int getDefaultInputDevice( void );
1008 void closeStream( void );
1009 void startStream( void );
1010 void stopStream( void );
1011 void abortStream( void );
1014 bool coInitialized_;
1015 IMMDeviceEnumerator* deviceEnumerator_;
1017 bool probeDeviceOpen( unsigned int device, StreamMode mode, unsigned int channels,
1018 unsigned int firstChannel, unsigned int sampleRate,
1019 RtAudioFormat format, unsigned int* bufferSize,
1020 RtAudio::StreamOptions* options );
1022 static DWORD WINAPI runWasapiThread( void* wasapiPtr );
1023 static DWORD WINAPI stopWasapiThread( void* wasapiPtr );
1024 static DWORD WINAPI abortWasapiThread( void* wasapiPtr );
1025 void wasapiThread();
1030 #if defined(__LINUX_ALSA__)
1032 class RtApiAlsa: public RtApi
1038 RtAudio::Api getCurrentApi() { return RtAudio::LINUX_ALSA; }
1039 unsigned int getDeviceCount( void );
1040 RtAudio::DeviceInfo getDeviceInfo( unsigned int device );
1041 void closeStream( void );
1042 void startStream( void );
1043 void stopStream( void );
1044 void abortStream( void );
1046 // This function is intended for internal use only. It must be
1047 // public because it is called by the internal callback handler,
1048 // which is not a member of RtAudio. External use of this function
1049 // will most likely produce highly undesireable results!
1050 void callbackEvent( void );
1054 std::vector<RtAudio::DeviceInfo> devices_;
1055 void saveDeviceInfo( void );
1056 bool probeDeviceOpen( unsigned int device, StreamMode mode, unsigned int channels,
1057 unsigned int firstChannel, unsigned int sampleRate,
1058 RtAudioFormat format, unsigned int *bufferSize,
1059 RtAudio::StreamOptions *options );
1064 #if defined(__LINUX_PULSE__)
1066 class RtApiPulse: public RtApi
1070 RtAudio::Api getCurrentApi() { return RtAudio::LINUX_PULSE; }
1071 unsigned int getDeviceCount( void );
1072 RtAudio::DeviceInfo getDeviceInfo( unsigned int device );
1073 void closeStream( void );
1074 void startStream( void );
1075 void stopStream( void );
1076 void abortStream( void );
1078 // This function is intended for internal use only. It must be
1079 // public because it is called by the internal callback handler,
1080 // which is not a member of RtAudio. External use of this function
1081 // will most likely produce highly undesireable results!
1082 void callbackEvent( void );
1086 std::vector<RtAudio::DeviceInfo> devices_;
1087 void saveDeviceInfo( void );
1088 bool probeDeviceOpen( unsigned int device, StreamMode mode, unsigned int channels,
1089 unsigned int firstChannel, unsigned int sampleRate,
1090 RtAudioFormat format, unsigned int *bufferSize,
1091 RtAudio::StreamOptions *options );
1096 #if defined(__LINUX_OSS__)
1098 class RtApiOss: public RtApi
1104 RtAudio::Api getCurrentApi() { return RtAudio::LINUX_OSS; }
1105 unsigned int getDeviceCount( void );
1106 RtAudio::DeviceInfo getDeviceInfo( unsigned int device );
1107 void closeStream( void );
1108 void startStream( void );
1109 void stopStream( void );
1110 void abortStream( void );
1112 // This function is intended for internal use only. It must be
1113 // public because it is called by the internal callback handler,
1114 // which is not a member of RtAudio. External use of this function
1115 // will most likely produce highly undesireable results!
1116 void callbackEvent( void );
1120 bool probeDeviceOpen( unsigned int device, StreamMode mode, unsigned int channels,
1121 unsigned int firstChannel, unsigned int sampleRate,
1122 RtAudioFormat format, unsigned int *bufferSize,
1123 RtAudio::StreamOptions *options );
1128 #if defined(__RTAUDIO_DUMMY__)
1130 class RtApiDummy: public RtApi
1134 RtApiDummy() { errorText_ = "RtApiDummy: This class provides no functionality."; error( RtAudioError::WARNING ); }
1135 RtAudio::Api getCurrentApi( void ) { return RtAudio::RTAUDIO_DUMMY; }
1136 unsigned int getDeviceCount( void ) { return 0; }
1137 RtAudio::DeviceInfo getDeviceInfo( unsigned int /*device*/ ) { RtAudio::DeviceInfo info; return info; }
1138 void closeStream( void ) {}
1139 void startStream( void ) {}
1140 void stopStream( void ) {}
1141 void abortStream( void ) {}
1145 bool probeDeviceOpen( unsigned int /*device*/, StreamMode /*mode*/, unsigned int /*channels*/,
1146 unsigned int /*firstChannel*/, unsigned int /*sampleRate*/,
1147 RtAudioFormat /*format*/, unsigned int * /*bufferSize*/,
1148 RtAudio::StreamOptions * /*options*/ ) { return false; }
1155 // Indentation settings for Vim and Emacs
1158 // c-basic-offset: 2
1159 // indent-tabs-mode: nil
1162 // vim: et sts=2 sw=2