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 and ASIO) operating systems.
10 RtAudio WWW site: http://www.music.mcgill.ca/~gary/rtaudio/
12 RtAudio: realtime audio i/o C++ classes
13 Copyright (c) 2001-2011 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 /************************************************************************/
45 // RtAudio: Version 4.0.8
54 /*! \typedef typedef unsigned long RtAudioFormat;
55 \brief RtAudio data format type.
57 Support for signed integers and floats. Audio data fed to/from an
58 RtAudio stream is assumed to ALWAYS be in host byte order. The
59 internal routines will automatically take care of any necessary
60 byte-swapping between the host format and the soundcard. Thus,
61 endian-ness is not a concern in the following format definitions.
62 Note that 24-bit data is expected to be encapsulated in a 32-bit
65 - \e RTAUDIO_SINT8: 8-bit signed integer.
66 - \e RTAUDIO_SINT16: 16-bit signed integer.
67 - \e RTAUDIO_SINT24: Lower 3 bytes of 32-bit signed integer.
68 - \e RTAUDIO_SINT32: 32-bit signed integer.
69 - \e RTAUDIO_FLOAT32: Normalized between plus/minus 1.0.
70 - \e RTAUDIO_FLOAT64: Normalized between plus/minus 1.0.
72 typedef unsigned long RtAudioFormat;
73 static const RtAudioFormat RTAUDIO_SINT8 = 0x1; // 8-bit signed integer.
74 static const RtAudioFormat RTAUDIO_SINT16 = 0x2; // 16-bit signed integer.
75 static const RtAudioFormat RTAUDIO_SINT24 = 0x4; // Lower 3 bytes of 32-bit signed integer.
76 static const RtAudioFormat RTAUDIO_SINT32 = 0x8; // 32-bit signed integer.
77 static const RtAudioFormat RTAUDIO_FLOAT32 = 0x10; // Normalized between plus/minus 1.0.
78 static const RtAudioFormat RTAUDIO_FLOAT64 = 0x20; // Normalized between plus/minus 1.0.
80 /*! \typedef typedef unsigned long RtAudioStreamFlags;
81 \brief RtAudio stream option flags.
83 The following flags can be OR'ed together to allow a client to
84 make changes to the default stream behavior:
86 - \e RTAUDIO_NONINTERLEAVED: Use non-interleaved buffers (default = interleaved).
87 - \e RTAUDIO_MINIMIZE_LATENCY: Attempt to set stream parameters for lowest possible latency.
88 - \e RTAUDIO_HOG_DEVICE: Attempt grab device for exclusive use.
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 typedef unsigned int RtAudioStreamFlags;
118 static const RtAudioStreamFlags RTAUDIO_NONINTERLEAVED = 0x1; // Use non-interleaved buffers (default = interleaved).
119 static const RtAudioStreamFlags RTAUDIO_MINIMIZE_LATENCY = 0x2; // Attempt to set stream parameters for lowest possible latency.
120 static const RtAudioStreamFlags RTAUDIO_HOG_DEVICE = 0x4; // Attempt grab device and prevent use by others.
121 static const RtAudioStreamFlags RTAUDIO_SCHEDULE_REALTIME = 0x8; // Try to select realtime scheduling for callback thread.
123 /*! \typedef typedef unsigned long RtAudioStreamStatus;
124 \brief RtAudio stream status (over- or underflow) flags.
126 Notification of a stream over- or underflow is indicated by a
127 non-zero stream \c status argument in the RtAudioCallback function.
128 The stream status can be one of the following two options,
129 depending on whether the stream is open for output and/or input:
131 - \e RTAUDIO_INPUT_OVERFLOW: Input data was discarded because of an overflow condition at the driver.
132 - \e RTAUDIO_OUTPUT_UNDERFLOW: The output buffer ran low, likely producing a break in the output sound.
134 typedef unsigned int RtAudioStreamStatus;
135 static const RtAudioStreamStatus RTAUDIO_INPUT_OVERFLOW = 0x1; // Input data was discarded because of an overflow condition at the driver.
136 static const RtAudioStreamStatus RTAUDIO_OUTPUT_UNDERFLOW = 0x2; // The output buffer ran low, likely causing a gap in the output sound.
138 //! RtAudio callback function prototype.
140 All RtAudio clients must create a function of type RtAudioCallback
141 to read and/or write data from/to the audio stream. When the
142 underlying audio system is ready for new input or output data, this
143 function will be invoked.
145 \param outputBuffer For output (or duplex) streams, the client
146 should write \c nFrames of audio sample frames into this
147 buffer. This argument should be recast to the datatype
148 specified when the stream was opened. For input-only
149 streams, this argument will be NULL.
151 \param inputBuffer For input (or duplex) streams, this buffer will
152 hold \c nFrames of input audio sample frames. This
153 argument should be recast to the datatype specified when the
154 stream was opened. For output-only streams, this argument
157 \param nFrames The number of sample frames of input or output
158 data in the buffers. The actual buffer size in bytes is
159 dependent on the data type and number of channels in use.
161 \param streamTime The number of seconds that have elapsed since the
164 \param status If non-zero, this argument indicates a data overflow
165 or underflow condition for the stream. The particular
166 condition can be determined by comparison with the
167 RtAudioStreamStatus flags.
169 \param userData A pointer to optional data provided by the client
170 when opening the stream (default = NULL).
172 To continue normal stream operation, the RtAudioCallback function
173 should return a value of zero. To stop the stream and drain the
174 output buffer, the function should return a value of one. To abort
175 the stream immediately, the client should return a value of two.
177 typedef int (*RtAudioCallback)( void *outputBuffer, void *inputBuffer,
178 unsigned int nFrames,
180 RtAudioStreamStatus status,
184 // **************************************************************** //
186 // RtAudio class declaration.
188 // RtAudio is a "controller" used to select an available audio i/o
189 // interface. It presents a common API for the user to call but all
190 // functionality is implemented by the class RtApi and its
191 // subclasses. RtAudio creates an instance of an RtApi subclass
192 // based on the user's API choice. If no choice is made, RtAudio
193 // attempts to make a "logical" API selection.
195 // **************************************************************** //
203 //! Audio API specifier arguments.
205 UNSPECIFIED, /*!< Search for a working compiled API. */
206 LINUX_ALSA, /*!< The Advanced Linux Sound Architecture API. */
207 LINUX_OSS, /*!< The Linux Open Sound System API. */
208 UNIX_JACK, /*!< The Jack Low-Latency Audio Server API. */
209 MACOSX_CORE, /*!< Macintosh OS-X Core Audio API. */
210 WINDOWS_ASIO, /*!< The Steinberg Audio Stream I/O API. */
211 WINDOWS_DS, /*!< The Microsoft Direct Sound API. */
212 RTAUDIO_DUMMY /*!< A compilable but non-functional API. */
215 //! The public device information structure for returning queried values.
217 bool probed; /*!< true if the device capabilities were successfully probed. */
218 std::string name; /*!< Character string device identifier. */
219 unsigned int outputChannels; /*!< Maximum output channels supported by device. */
220 unsigned int inputChannels; /*!< Maximum input channels supported by device. */
221 unsigned int duplexChannels; /*!< Maximum simultaneous input/output channels supported by device. */
222 bool isDefaultOutput; /*!< true if this is the default output device. */
223 bool isDefaultInput; /*!< true if this is the default input device. */
224 std::vector<unsigned int> sampleRates; /*!< Supported sample rates (queried from list of standard rates). */
225 RtAudioFormat nativeFormats; /*!< Bit mask of supported data formats. */
227 // Default constructor.
229 :probed(false), outputChannels(0), inputChannels(0), duplexChannels(0),
230 isDefaultOutput(false), isDefaultInput(false), nativeFormats(0) {}
233 //! The structure for specifying input or ouput stream parameters.
234 struct StreamParameters {
235 unsigned int deviceId; /*!< Device index (0 to getDeviceCount() - 1). */
236 unsigned int nChannels; /*!< Number of channels. */
237 unsigned int firstChannel; /*!< First channel index on device (default = 0). */
239 // Default constructor.
241 : deviceId(0), nChannels(0), firstChannel(0) {}
244 //! The structure for specifying stream options.
246 The following flags can be OR'ed together to allow a client to
247 make changes to the default stream behavior:
249 - \e RTAUDIO_NONINTERLEAVED: Use non-interleaved buffers (default = interleaved).
250 - \e RTAUDIO_MINIMIZE_LATENCY: Attempt to set stream parameters for lowest possible latency.
251 - \e RTAUDIO_HOG_DEVICE: Attempt grab device for exclusive use.
252 - \e RTAUDIO_SCHEDULE_REALTIME: Attempt to select realtime scheduling for callback thread.
254 By default, RtAudio streams pass and receive audio data from the
255 client in an interleaved format. By passing the
256 RTAUDIO_NONINTERLEAVED flag to the openStream() function, audio
257 data will instead be presented in non-interleaved buffers. In
258 this case, each buffer argument in the RtAudioCallback function
259 will point to a single array of data, with \c nFrames samples for
260 each channel concatenated back-to-back. For example, the first
261 sample of data for the second channel would be located at index \c
262 nFrames (assuming the \c buffer pointer was recast to the correct
263 data type for the stream).
265 Certain audio APIs offer a number of parameters that influence the
266 I/O latency of a stream. By default, RtAudio will attempt to set
267 these parameters internally for robust (glitch-free) performance
268 (though some APIs, like Windows Direct Sound, make this difficult).
269 By passing the RTAUDIO_MINIMIZE_LATENCY flag to the openStream()
270 function, internal stream settings will be influenced in an attempt
271 to minimize stream latency, though possibly at the expense of stream
274 If the RTAUDIO_HOG_DEVICE flag is set, RtAudio will attempt to
275 open the input and/or output stream device(s) for exclusive use.
276 Note that this is not possible with all supported audio APIs.
278 If the RTAUDIO_SCHEDULE_REALTIME flag is set, RtAudio will attempt
279 to select realtime scheduling (round-robin) for the callback thread.
280 The \c priority parameter will only be used if the RTAUDIO_SCHEDULE_REALTIME
281 flag is set. It defines the thread's realtime priority.
283 The \c numberOfBuffers parameter can be used to control stream
284 latency in the Windows DirectSound, Linux OSS, and Linux Alsa APIs
285 only. A value of two is usually the smallest allowed. Larger
286 numbers can potentially result in more robust stream performance,
287 though likely at the cost of stream latency. The value set by the
288 user is replaced during execution of the RtAudio::openStream()
289 function by the value actually used by the system.
291 The \c streamName parameter can be used to set the client name
292 when using the Jack API. By default, the client name is set to
293 RtApiJack. However, if you wish to create multiple instances of
294 RtAudio with Jack, each instance must have a unique client name.
296 struct StreamOptions {
297 RtAudioStreamFlags flags; /*!< A bit-mask of stream flags (RTAUDIO_NONINTERLEAVED, RTAUDIO_MINIMIZE_LATENCY, RTAUDIO_HOG_DEVICE). */
298 unsigned int numberOfBuffers; /*!< Number of stream buffers. */
299 std::string streamName; /*!< A stream name (currently used only in Jack). */
300 int priority; /*!< Scheduling priority of callback thread (only used with flag RTAUDIO_SCHEDULE_REALTIME). */
302 // Default constructor.
304 : flags(0), numberOfBuffers(0), priority(0) {}
307 //! A static function to determine the available compiled audio APIs.
309 The values returned in the std::vector can be compared against
310 the enumerated list values. Note that there can be more than one
311 API compiled for certain operating systems.
313 static void getCompiledApi( std::vector<RtAudio::Api> &apis ) throw();
315 //! The class constructor.
317 The constructor performs minor initialization tasks. No exceptions
320 If no API argument is specified and multiple API support has been
321 compiled, the default order of use is JACK, ALSA, OSS (Linux
322 systems) and ASIO, DS (Windows systems).
324 RtAudio( RtAudio::Api api=UNSPECIFIED ) throw();
328 If a stream is running or open, it will be stopped and closed
333 //! Returns the audio API specifier for the current instance of RtAudio.
334 RtAudio::Api getCurrentApi( void ) throw();
336 //! A public function that queries for the number of audio devices available.
338 This function performs a system query of available devices each time it
339 is called, thus supporting devices connected \e after instantiation. If
340 a system error occurs during processing, a warning will be issued.
342 unsigned int getDeviceCount( void ) throw();
344 //! Return an RtAudio::DeviceInfo structure for a specified device number.
347 Any device integer between 0 and getDeviceCount() - 1 is valid.
348 If an invalid argument is provided, an RtError (type = INVALID_USE)
349 will be thrown. If a device is busy or otherwise unavailable, the
350 structure member "probed" will have a value of "false" and all
351 other members are undefined. If the specified device is the
352 current default input or output device, the corresponding
353 "isDefault" member will have a value of "true".
355 RtAudio::DeviceInfo getDeviceInfo( unsigned int device );
357 //! A function that returns the index of the default output device.
359 If the underlying audio API does not provide a "default
360 device", or if no devices are available, the return value will be
361 0. Note that this is a valid device identifier and it is the
362 client's responsibility to verify that a device is available
363 before attempting to open a stream.
365 unsigned int getDefaultOutputDevice( void ) throw();
367 //! A function that returns the index of the default input device.
369 If the underlying audio API does not provide a "default
370 device", or if no devices are available, the return value will be
371 0. Note that this is a valid device identifier and it is the
372 client's responsibility to verify that a device is available
373 before attempting to open a stream.
375 unsigned int getDefaultInputDevice( void ) throw();
377 //! A public function for opening a stream with the specified parameters.
379 An RtError (type = SYSTEM_ERROR) is thrown if a stream cannot be
380 opened with the specified parameters or an error occurs during
381 processing. An RtError (type = INVALID_USE) is thrown if any
382 invalid device ID or channel number parameters are specified.
384 \param outputParameters Specifies output stream parameters to use
385 when opening a stream, including a device ID, number of channels,
386 and starting channel number. For input-only streams, this
387 argument should be NULL. The device ID is an index value between
388 0 and getDeviceCount() - 1.
389 \param inputParameters Specifies input stream parameters to use
390 when opening a stream, including a device ID, number of channels,
391 and starting channel number. For output-only streams, this
392 argument should be NULL. The device ID is an index value between
393 0 and getDeviceCount() - 1.
394 \param format An RtAudioFormat specifying the desired sample data format.
395 \param sampleRate The desired sample rate (sample frames per second).
396 \param *bufferFrames A pointer to a value indicating the desired
397 internal buffer size in sample frames. The actual value
398 used by the device is returned via the same pointer. A
399 value of zero can be specified, in which case the lowest
400 allowable value is determined.
401 \param callback A client-defined function that will be invoked
402 when input data is available and/or output data is needed.
403 \param userData An optional pointer to data that can be accessed
404 from within the callback function.
405 \param options An optional pointer to a structure containing various
406 global stream options, including a list of OR'ed RtAudioStreamFlags
407 and a suggested number of stream buffers that can be used to
408 control stream latency. More buffers typically result in more
409 robust performance, though at a cost of greater latency. If a
410 value of zero is specified, a system-specific median value is
411 chosen. If the RTAUDIO_MINIMIZE_LATENCY flag bit is set, the
412 lowest allowable value is used. The actual value used is
413 returned via the structure argument. The parameter is API dependent.
415 void openStream( RtAudio::StreamParameters *outputParameters,
416 RtAudio::StreamParameters *inputParameters,
417 RtAudioFormat format, unsigned int sampleRate,
418 unsigned int *bufferFrames, RtAudioCallback callback,
419 void *userData = NULL, RtAudio::StreamOptions *options = NULL );
421 //! A function that closes a stream and frees any associated stream memory.
423 If a stream is not open, this function issues a warning and
424 returns (no exception is thrown).
426 void closeStream( void ) throw();
428 //! A function that starts a stream.
430 An RtError (type = SYSTEM_ERROR) is thrown if an error occurs
431 during processing. An RtError (type = INVALID_USE) is thrown if a
432 stream is not open. A warning is issued if the stream is already
435 void startStream( void );
437 //! Stop a stream, allowing any samples remaining in the output queue to be played.
439 An RtError (type = SYSTEM_ERROR) is thrown if an error occurs
440 during processing. An RtError (type = INVALID_USE) is thrown if a
441 stream is not open. A warning is issued if the stream is already
444 void stopStream( void );
446 //! Stop a stream, discarding any samples remaining in the input/output queue.
448 An RtError (type = SYSTEM_ERROR) is thrown if an error occurs
449 during processing. An RtError (type = INVALID_USE) is thrown if a
450 stream is not open. A warning is issued if the stream is already
453 void abortStream( void );
455 //! Returns true if a stream is open and false if not.
456 bool isStreamOpen( void ) const throw();
458 //! Returns true if the stream is running and false if it is stopped or not open.
459 bool isStreamRunning( void ) const throw();
461 //! Returns the number of elapsed seconds since the stream was started.
463 If a stream is not open, an RtError (type = INVALID_USE) will be thrown.
465 double getStreamTime( void );
467 //! Returns the internal stream latency in sample frames.
469 The stream latency refers to delay in audio input and/or output
470 caused by internal buffering by the audio system and/or hardware.
471 For duplex streams, the returned value will represent the sum of
472 the input and output latencies. If a stream is not open, an
473 RtError (type = INVALID_USE) will be thrown. If the API does not
474 report latency, the return value will be zero.
476 long getStreamLatency( void );
478 //! Returns actual sample rate in use by the stream.
480 On some systems, the sample rate used may be slightly different
481 than that specified in the stream parameters. If a stream is not
482 open, an RtError (type = INVALID_USE) will be thrown.
484 unsigned int getStreamSampleRate( void );
486 //! Specify whether warning messages should be printed to stderr.
487 void showWarnings( bool value = true ) throw();
491 void openRtApi( RtAudio::Api api );
495 // Operating system dependent thread functionality.
496 #if defined(__WINDOWS_DS__) || defined(__WINDOWS_ASIO__)
500 typedef unsigned long ThreadHandle;
501 typedef CRITICAL_SECTION StreamMutex;
503 #elif defined(__LINUX_ALSA__) || defined(__UNIX_JACK__) || defined(__LINUX_OSS__) || defined(__MACOSX_CORE__)
504 // Using pthread library for various flavors of unix.
507 typedef pthread_t ThreadHandle;
508 typedef pthread_mutex_t StreamMutex;
510 #else // Setup for "dummy" behavior
512 #define __RTAUDIO_DUMMY__
513 typedef int ThreadHandle;
514 typedef int StreamMutex;
518 // This global structure type is used to pass callback information
519 // between the private RtAudio stream structure and global callback
520 // handling functions.
521 struct CallbackInfo {
522 void *object; // Used as a "this" pointer.
526 void *apiInfo; // void pointer for API specific callback information
529 // Default constructor.
531 :object(0), callback(0), userData(0), apiInfo(0), isRunning(false) {}
534 // **************************************************************** //
536 // RtApi class declaration.
538 // Subclasses of RtApi contain all API- and OS-specific code necessary
539 // to fully implement the RtAudio API.
541 // Note that RtApi is an abstract base class and cannot be
542 // explicitly instantiated. The class RtAudio will create an
543 // instance of an RtApi subclass (RtApiOss, RtApiAlsa,
544 // RtApiJack, RtApiCore, RtApiAl, RtApiDs, or RtApiAsio).
546 // **************************************************************** //
548 #if defined( HAVE_GETTIMEOFDAY )
549 #include <sys/time.h>
560 virtual RtAudio::Api getCurrentApi( void ) = 0;
561 virtual unsigned int getDeviceCount( void ) = 0;
562 virtual RtAudio::DeviceInfo getDeviceInfo( unsigned int device ) = 0;
563 virtual unsigned int getDefaultInputDevice( void );
564 virtual unsigned int getDefaultOutputDevice( void );
565 void openStream( RtAudio::StreamParameters *outputParameters,
566 RtAudio::StreamParameters *inputParameters,
567 RtAudioFormat format, unsigned int sampleRate,
568 unsigned int *bufferFrames, RtAudioCallback callback,
569 void *userData, RtAudio::StreamOptions *options );
570 virtual void closeStream( void );
571 virtual void startStream( void ) = 0;
572 virtual void stopStream( void ) = 0;
573 virtual void abortStream( void ) = 0;
574 long getStreamLatency( void );
575 unsigned int getStreamSampleRate( void );
576 virtual double getStreamTime( void );
577 bool isStreamOpen( void ) const { return stream_.state != STREAM_CLOSED; };
578 bool isStreamRunning( void ) const { return stream_.state == STREAM_RUNNING; };
579 void showWarnings( bool value ) { showWarnings_ = value; };
584 static const unsigned int MAX_SAMPLE_RATES;
585 static const unsigned int SAMPLE_RATES[];
587 enum { FAILURE, SUCCESS };
602 // A protected structure used for buffer conversion.
606 RtAudioFormat inFormat, outFormat;
607 std::vector<int> inOffset;
608 std::vector<int> outOffset;
611 // A protected structure for audio streams.
613 unsigned int device[2]; // Playback and record, respectively.
614 void *apiHandle; // void pointer for API specific stream handle information
615 StreamMode mode; // OUTPUT, INPUT, or DUPLEX.
616 StreamState state; // STOPPED, RUNNING, or CLOSED
617 char *userBuffer[2]; // Playback and record, respectively.
619 bool doConvertBuffer[2]; // Playback and record, respectively.
620 bool userInterleaved;
621 bool deviceInterleaved[2]; // Playback and record, respectively.
622 bool doByteSwap[2]; // Playback and record, respectively.
623 unsigned int sampleRate;
624 unsigned int bufferSize;
625 unsigned int nBuffers;
626 unsigned int nUserChannels[2]; // Playback and record, respectively.
627 unsigned int nDeviceChannels[2]; // Playback and record channels, respectively.
628 unsigned int channelOffset[2]; // Playback and record, respectively.
629 unsigned long latency[2]; // Playback and record, respectively.
630 RtAudioFormat userFormat;
631 RtAudioFormat deviceFormat[2]; // Playback and record, respectively.
633 CallbackInfo callbackInfo;
634 ConvertInfo convertInfo[2];
635 double streamTime; // Number of elapsed seconds since the stream started.
637 #if defined(HAVE_GETTIMEOFDAY)
638 struct timeval lastTickTimestamp;
642 :apiHandle(0), deviceBuffer(0) { device[0] = 11111; device[1] = 11111; }
645 typedef signed short Int16;
646 typedef signed int Int32;
647 typedef float Float32;
648 typedef double Float64;
650 std::ostringstream errorStream_;
651 std::string errorText_;
656 Protected, api-specific method that attempts to open a device
657 with the given parameters. This function MUST be implemented by
658 all subclasses. If an error is encountered during the probe, a
659 "warning" message is reported and FAILURE is returned. A
660 successful probe is indicated by a return value of SUCCESS.
662 virtual bool probeDeviceOpen( unsigned int device, StreamMode mode, unsigned int channels,
663 unsigned int firstChannel, unsigned int sampleRate,
664 RtAudioFormat format, unsigned int *bufferSize,
665 RtAudio::StreamOptions *options );
667 //! A protected function used to increment the stream time.
668 void tickStreamTime( void );
670 //! Protected common method to clear an RtApiStream structure.
671 void clearStreamInfo();
674 Protected common method that throws an RtError (type =
675 INVALID_USE) if a stream is not open.
677 void verifyStream( void );
679 //! Protected common error method to allow global control over error handling.
680 void error( RtError::Type type );
683 Protected method used to perform format, channel number, and/or interleaving
684 conversions between the user and device buffers.
686 void convertBuffer( char *outBuffer, char *inBuffer, ConvertInfo &info );
688 //! Protected common method used to perform byte-swapping on buffers.
689 void byteSwapBuffer( char *buffer, unsigned int samples, RtAudioFormat format );
691 //! Protected common method that returns the number of bytes for a given format.
692 unsigned int formatBytes( RtAudioFormat format );
694 //! Protected common method that sets up the parameters for buffer conversion.
695 void setConvertInfo( StreamMode mode, unsigned int firstChannel );
698 // **************************************************************** //
700 // Inline RtAudio definitions.
702 // **************************************************************** //
704 inline RtAudio::Api RtAudio :: getCurrentApi( void ) throw() { return rtapi_->getCurrentApi(); }
705 inline unsigned int RtAudio :: getDeviceCount( void ) throw() { return rtapi_->getDeviceCount(); }
706 inline RtAudio::DeviceInfo RtAudio :: getDeviceInfo( unsigned int device ) { return rtapi_->getDeviceInfo( device ); }
707 inline unsigned int RtAudio :: getDefaultInputDevice( void ) throw() { return rtapi_->getDefaultInputDevice(); }
708 inline unsigned int RtAudio :: getDefaultOutputDevice( void ) throw() { return rtapi_->getDefaultOutputDevice(); }
709 inline void RtAudio :: closeStream( void ) throw() { return rtapi_->closeStream(); }
710 inline void RtAudio :: startStream( void ) { return rtapi_->startStream(); }
711 inline void RtAudio :: stopStream( void ) { return rtapi_->stopStream(); }
712 inline void RtAudio :: abortStream( void ) { return rtapi_->abortStream(); }
713 inline bool RtAudio :: isStreamOpen( void ) const throw() { return rtapi_->isStreamOpen(); }
714 inline bool RtAudio :: isStreamRunning( void ) const throw() { return rtapi_->isStreamRunning(); }
715 inline long RtAudio :: getStreamLatency( void ) { return rtapi_->getStreamLatency(); }
716 inline unsigned int RtAudio :: getStreamSampleRate( void ) { return rtapi_->getStreamSampleRate(); };
717 inline double RtAudio :: getStreamTime( void ) { return rtapi_->getStreamTime(); }
718 inline void RtAudio :: showWarnings( bool value ) throw() { rtapi_->showWarnings( value ); }
720 // RtApi Subclass prototypes.
722 #if defined(__MACOSX_CORE__)
724 #include <CoreAudio/AudioHardware.h>
726 class RtApiCore: public RtApi
732 RtAudio::Api getCurrentApi( void ) { return RtAudio::MACOSX_CORE; };
733 unsigned int getDeviceCount( void );
734 RtAudio::DeviceInfo getDeviceInfo( unsigned int device );
735 unsigned int getDefaultOutputDevice( void );
736 unsigned int getDefaultInputDevice( void );
737 void closeStream( void );
738 void startStream( void );
739 void stopStream( void );
740 void abortStream( void );
741 long getStreamLatency( void );
743 // This function is intended for internal use only. It must be
744 // public because it is called by the internal callback handler,
745 // which is not a member of RtAudio. External use of this function
746 // will most likely produce highly undesireable results!
747 bool callbackEvent( AudioDeviceID deviceId,
748 const AudioBufferList *inBufferList,
749 const AudioBufferList *outBufferList );
753 bool probeDeviceOpen( unsigned int device, StreamMode mode, unsigned int channels,
754 unsigned int firstChannel, unsigned int sampleRate,
755 RtAudioFormat format, unsigned int *bufferSize,
756 RtAudio::StreamOptions *options );
757 static const char* getErrorCode( OSStatus code );
762 #if defined(__UNIX_JACK__)
764 class RtApiJack: public RtApi
770 RtAudio::Api getCurrentApi( void ) { return RtAudio::UNIX_JACK; };
771 unsigned int getDeviceCount( void );
772 RtAudio::DeviceInfo getDeviceInfo( unsigned int device );
773 void closeStream( void );
774 void startStream( void );
775 void stopStream( void );
776 void abortStream( void );
777 long getStreamLatency( void );
779 // This function is intended for internal use only. It must be
780 // public because it is called by the internal callback handler,
781 // which is not a member of RtAudio. External use of this function
782 // will most likely produce highly undesireable results!
783 bool callbackEvent( unsigned long nframes );
787 bool probeDeviceOpen( unsigned int device, StreamMode mode, unsigned int channels,
788 unsigned int firstChannel, unsigned int sampleRate,
789 RtAudioFormat format, unsigned int *bufferSize,
790 RtAudio::StreamOptions *options );
795 #if defined(__WINDOWS_ASIO__)
797 class RtApiAsio: public RtApi
803 RtAudio::Api getCurrentApi( void ) { return RtAudio::WINDOWS_ASIO; };
804 unsigned int getDeviceCount( void );
805 RtAudio::DeviceInfo getDeviceInfo( unsigned int device );
806 void closeStream( void );
807 void startStream( void );
808 void stopStream( void );
809 void abortStream( void );
810 long getStreamLatency( void );
812 // This function is intended for internal use only. It must be
813 // public because it is called by the internal callback handler,
814 // which is not a member of RtAudio. External use of this function
815 // will most likely produce highly undesireable results!
816 bool callbackEvent( long bufferIndex );
820 std::vector<RtAudio::DeviceInfo> devices_;
821 void saveDeviceInfo( void );
823 bool probeDeviceOpen( unsigned int device, StreamMode mode, unsigned int channels,
824 unsigned int firstChannel, unsigned int sampleRate,
825 RtAudioFormat format, unsigned int *bufferSize,
826 RtAudio::StreamOptions *options );
831 #if defined(__WINDOWS_DS__)
833 class RtApiDs: public RtApi
839 RtAudio::Api getCurrentApi( void ) { return RtAudio::WINDOWS_DS; };
840 unsigned int getDeviceCount( void );
841 unsigned int getDefaultOutputDevice( void );
842 unsigned int getDefaultInputDevice( void );
843 RtAudio::DeviceInfo getDeviceInfo( unsigned int device );
844 void closeStream( void );
845 void startStream( void );
846 void stopStream( void );
847 void abortStream( void );
848 long getStreamLatency( void );
850 // This function is intended for internal use only. It must be
851 // public because it is called by the internal callback handler,
852 // which is not a member of RtAudio. External use of this function
853 // will most likely produce highly undesireable results!
854 void callbackEvent( void );
860 long duplexPrerollBytes;
861 bool probeDeviceOpen( unsigned int device, StreamMode mode, unsigned int channels,
862 unsigned int firstChannel, unsigned int sampleRate,
863 RtAudioFormat format, unsigned int *bufferSize,
864 RtAudio::StreamOptions *options );
869 #if defined(__LINUX_ALSA__)
871 class RtApiAlsa: public RtApi
877 RtAudio::Api getCurrentApi() { return RtAudio::LINUX_ALSA; };
878 unsigned int getDeviceCount( void );
879 RtAudio::DeviceInfo getDeviceInfo( unsigned int device );
880 void closeStream( void );
881 void startStream( void );
882 void stopStream( void );
883 void abortStream( void );
885 // This function is intended for internal use only. It must be
886 // public because it is called by the internal callback handler,
887 // which is not a member of RtAudio. External use of this function
888 // will most likely produce highly undesireable results!
889 void callbackEvent( void );
893 std::vector<RtAudio::DeviceInfo> devices_;
894 void saveDeviceInfo( void );
895 bool probeDeviceOpen( unsigned int device, StreamMode mode, unsigned int channels,
896 unsigned int firstChannel, unsigned int sampleRate,
897 RtAudioFormat format, unsigned int *bufferSize,
898 RtAudio::StreamOptions *options );
903 #if defined(__LINUX_OSS__)
905 class RtApiOss: public RtApi
911 RtAudio::Api getCurrentApi() { return RtAudio::LINUX_OSS; };
912 unsigned int getDeviceCount( void );
913 RtAudio::DeviceInfo getDeviceInfo( unsigned int device );
914 void closeStream( void );
915 void startStream( void );
916 void stopStream( void );
917 void abortStream( void );
919 // This function is intended for internal use only. It must be
920 // public because it is called by the internal callback handler,
921 // which is not a member of RtAudio. External use of this function
922 // will most likely produce highly undesireable results!
923 void callbackEvent( void );
927 bool probeDeviceOpen( unsigned int device, StreamMode mode, unsigned int channels,
928 unsigned int firstChannel, unsigned int sampleRate,
929 RtAudioFormat format, unsigned int *bufferSize,
930 RtAudio::StreamOptions *options );
935 #if defined(__RTAUDIO_DUMMY__)
937 class RtApiDummy: public RtApi
941 RtApiDummy() { errorText_ = "RtApiDummy: This class provides no functionality."; error( RtError::WARNING ); };
942 RtAudio::Api getCurrentApi( void ) { return RtAudio::RTAUDIO_DUMMY; };
943 unsigned int getDeviceCount( void ) { return 0; };
944 RtAudio::DeviceInfo getDeviceInfo( unsigned int device ) { RtAudio::DeviceInfo info; return info; };
945 void closeStream( void ) {};
946 void startStream( void ) {};
947 void stopStream( void ) {};
948 void abortStream( void ) {};
952 bool probeDeviceOpen( unsigned int device, StreamMode mode, unsigned int channels,
953 unsigned int firstChannel, unsigned int sampleRate,
954 RtAudioFormat format, unsigned int *bufferSize,
955 RtAudio::StreamOptions *options ) { return false; };
962 // Indentation settings for Vim and Emacs
966 // indent-tabs-mode: nil
969 // vim: et sts=2 sw=2