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RtAudio.cpp
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RtAudio.cpp
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/************************************************************************/
/*! \class RtAudio
\brief Realtime audio i/o C++ classes.
RtAudio provides a common API (Application Programming Interface)
for realtime audio input/output across Linux (native ALSA, Jack,
and OSS), Macintosh OS X (CoreAudio and Jack), and Windows
(DirectSound, ASIO and WASAPI) operating systems.
RtAudio GitHub site: https://github.com/thestk/rtaudio
RtAudio WWW site: http://www.music.mcgill.ca/~gary/rtaudio/
RtAudio: realtime audio i/o C++ classes
Copyright (c) 2001-2022 Gary P. Scavone
Permission is hereby granted, free of charge, to any person
obtaining a copy of this software and associated documentation files
(the "Software"), to deal in the Software without restriction,
including without limitation the rights to use, copy, modify, merge,
publish, distribute, sublicense, and/or sell copies of the Software,
and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
Any person wishing to distribute modifications to the Software is
asked to send the modifications to the original developer so that
they can be incorporated into the canonical version. This is,
however, not a binding provision of this license.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/************************************************************************/
// RtAudio: Version 6.0.0beta1
#include "RtAudio.h"
#include <iostream>
#include <cstdlib>
#include <cstring>
#include <climits>
#include <cmath>
#include <algorithm>
#include <codecvt>
#include <locale>
#if defined(_WIN32)
#include <windows.h>
#endif
// Static variable definitions.
const unsigned int RtApi::MAX_SAMPLE_RATES = 14;
const unsigned int RtApi::SAMPLE_RATES[] = {
4000, 5512, 8000, 9600, 11025, 16000, 22050,
32000, 44100, 48000, 88200, 96000, 176400, 192000
};
template<typename T> inline
std::string convertCharPointerToStdString(const T *text);
template<> inline
std::string convertCharPointerToStdString(const char *text)
{
return text;
}
template<> inline
std::string convertCharPointerToStdString(const wchar_t *text)
{
return std::wstring_convert<std::codecvt_utf8_utf16<wchar_t>>{}.to_bytes(text);
}
#if defined(_MSC_VER)
#define MUTEX_INITIALIZE(A) InitializeCriticalSection(A)
#define MUTEX_DESTROY(A) DeleteCriticalSection(A)
#define MUTEX_LOCK(A) EnterCriticalSection(A)
#define MUTEX_UNLOCK(A) LeaveCriticalSection(A)
#else
#define MUTEX_INITIALIZE(A) pthread_mutex_init(A, NULL)
#define MUTEX_DESTROY(A) pthread_mutex_destroy(A)
#define MUTEX_LOCK(A) pthread_mutex_lock(A)
#define MUTEX_UNLOCK(A) pthread_mutex_unlock(A)
#endif
// *************************************************** //
//
// RtApi subclass prototypes.
//
// *************************************************** //
#if defined(__MACOSX_CORE__)
#include <CoreAudio/AudioHardware.h>
class RtApiCore: public RtApi
{
public:
RtApiCore();
~RtApiCore();
RtAudio::Api getCurrentApi( void ) override { return RtAudio::MACOSX_CORE; }
unsigned int getDefaultOutputDevice( void ) override;
unsigned int getDefaultInputDevice( void ) override;
void closeStream( void ) override;
RtAudioErrorType startStream( void ) override;
RtAudioErrorType stopStream( void ) override;
RtAudioErrorType abortStream( void ) override;
// This function is intended for internal use only. It must be
// public because it is called by an internal callback handler,
// which is not a member of RtAudio. External use of this function
// will most likely produce highly undesirable results!
bool callbackEvent( AudioDeviceID deviceId,
const AudioBufferList *inBufferList,
const AudioBufferList *outBufferList );
private:
void probeDevices( void ) override;
bool probeDeviceInfo( AudioDeviceID id, RtAudio::DeviceInfo &info );
bool probeDeviceOpen( unsigned int deviceId, StreamMode mode, unsigned int channels,
unsigned int firstChannel, unsigned int sampleRate,
RtAudioFormat format, unsigned int *bufferSize,
RtAudio::StreamOptions *options ) override;
static const char* getErrorCode( OSStatus code );
std::vector< AudioDeviceID > deviceIds_;
};
#endif
#if defined(__UNIX_JACK__)
#include <jack/jack.h>
class RtApiJack: public RtApi
{
public:
RtApiJack();
~RtApiJack();
RtAudio::Api getCurrentApi( void ) override { return RtAudio::UNIX_JACK; }
void closeStream( void ) override;
RtAudioErrorType startStream( void ) override;
RtAudioErrorType stopStream( void ) override;
RtAudioErrorType abortStream( void ) override;
// This function is intended for internal use only. It must be
// public because it is called by the internal callback handler,
// which is not a member of RtAudio. External use of this function
// will most likely produce highly undesirable results!
bool callbackEvent( unsigned long nframes );
private:
void probeDevices( void ) override;
bool probeDeviceInfo( RtAudio::DeviceInfo &info, jack_client_t *client );
bool probeDeviceOpen( unsigned int deviceId, StreamMode mode, unsigned int channels,
unsigned int firstChannel, unsigned int sampleRate,
RtAudioFormat format, unsigned int *bufferSize,
RtAudio::StreamOptions *options ) override;
bool shouldAutoconnect_;
};
#endif
#if defined(__WINDOWS_ASIO__)
class RtApiAsio: public RtApi
{
public:
RtApiAsio();
~RtApiAsio();
RtAudio::Api getCurrentApi( void ) override { return RtAudio::WINDOWS_ASIO; }
void closeStream( void ) override;
RtAudioErrorType startStream( void ) override;
RtAudioErrorType stopStream( void ) override;
RtAudioErrorType abortStream( void ) override;
// This function is intended for internal use only. It must be
// public because it is called by the internal callback handler,
// which is not a member of RtAudio. External use of this function
// will most likely produce highly undesirable results!
bool callbackEvent( long bufferIndex );
private:
bool coInitialized_;
void probeDevices( void ) override;
bool probeDeviceInfo( RtAudio::DeviceInfo &info );
bool probeDeviceOpen( unsigned int device, StreamMode mode, unsigned int channels,
unsigned int firstChannel, unsigned int sampleRate,
RtAudioFormat format, unsigned int *bufferSize,
RtAudio::StreamOptions *options ) override;
};
#endif
#if defined(__WINDOWS_DS__)
class RtApiDs: public RtApi
{
public:
RtApiDs();
~RtApiDs();
RtAudio::Api getCurrentApi( void ) override { return RtAudio::WINDOWS_DS; }
void closeStream( void ) override;
RtAudioErrorType startStream( void ) override;
RtAudioErrorType stopStream( void ) override;
RtAudioErrorType abortStream( void ) override;
// This function is intended for internal use only. It must be
// public because it is called by the internal callback handler,
// which is not a member of RtAudio. External use of this function
// will most likely produce highly undesirable results!
void callbackEvent( void );
private:
bool coInitialized_;
bool buffersRolling;
long duplexPrerollBytes;
std::vector<struct DsDevice> dsDevices_;
void probeDevices( void ) override;
bool probeDeviceInfo( RtAudio::DeviceInfo &info, DsDevice &dsDevice );
bool probeDeviceOpen( unsigned int deviceId, StreamMode mode, unsigned int channels,
unsigned int firstChannel, unsigned int sampleRate,
RtAudioFormat format, unsigned int *bufferSize,
RtAudio::StreamOptions *options ) override;
};
#endif
#if defined(__WINDOWS_WASAPI__)
struct IMMDeviceEnumerator;
class RtApiWasapi : public RtApi
{
public:
RtApiWasapi();
virtual ~RtApiWasapi();
RtAudio::Api getCurrentApi( void ) override { return RtAudio::WINDOWS_WASAPI; }
unsigned int getDefaultOutputDevice( void ) override;
unsigned int getDefaultInputDevice( void ) override;
void closeStream( void ) override;
RtAudioErrorType startStream( void ) override;
RtAudioErrorType stopStream( void ) override;
RtAudioErrorType abortStream( void ) override;
private:
bool coInitialized_;
IMMDeviceEnumerator* deviceEnumerator_;
std::vector< std::pair< std::string, bool> > deviceIds_;
void probeDevices( void ) override;
bool probeDeviceInfo( RtAudio::DeviceInfo &info, LPWSTR deviceId, bool isCaptureDevice );
bool probeDeviceOpen( unsigned int deviceId, StreamMode mode, unsigned int channels,
unsigned int firstChannel, unsigned int sampleRate,
RtAudioFormat format, unsigned int* bufferSize,
RtAudio::StreamOptions* options ) override;
static DWORD WINAPI runWasapiThread( void* wasapiPtr );
static DWORD WINAPI stopWasapiThread( void* wasapiPtr );
static DWORD WINAPI abortWasapiThread( void* wasapiPtr );
void wasapiThread();
};
#endif
#if defined(__LINUX_ALSA__)
class RtApiAlsa: public RtApi
{
public:
RtApiAlsa();
~RtApiAlsa();
RtAudio::Api getCurrentApi() override { return RtAudio::LINUX_ALSA; }
void closeStream( void ) override;
RtAudioErrorType startStream( void ) override;
RtAudioErrorType stopStream( void ) override;
RtAudioErrorType abortStream( void ) override;
// This function is intended for internal use only. It must be
// public because it is called by the internal callback handler,
// which is not a member of RtAudio. External use of this function
// will most likely produce highly undesirable results!
void callbackEvent( void );
private:
std::vector<std::pair<std::string, unsigned int>> deviceIdPairs_;
void probeDevices( void ) override;
bool probeDeviceInfo( RtAudio::DeviceInfo &info, std::string name );
bool probeDeviceOpen( unsigned int deviceId, StreamMode mode, unsigned int channels,
unsigned int firstChannel, unsigned int sampleRate,
RtAudioFormat format, unsigned int *bufferSize,
RtAudio::StreamOptions *options ) override;
};
#endif
#if defined(__LINUX_PULSE__)
#include <pulse/pulseaudio.h>
class RtApiPulse: public RtApi
{
public:
~RtApiPulse();
RtAudio::Api getCurrentApi() override { return RtAudio::LINUX_PULSE; }
void closeStream( void ) override;
RtAudioErrorType startStream( void ) override;
RtAudioErrorType stopStream( void ) override;
RtAudioErrorType abortStream( void ) override;
// This function is intended for internal use only. It must be
// public because it is called by the internal callback handler,
// which is not a member of RtAudio. External use of this function
// will most likely produce highly undesirable results!
void callbackEvent( void );
struct PaDeviceInfo {
std::string sinkName;
std::string sourceName;
};
private:
std::vector< PaDeviceInfo > paDeviceList_;
void probeDevices( void ) override;
bool probeDeviceOpen( unsigned int deviceId, StreamMode mode, unsigned int channels,
unsigned int firstChannel, unsigned int sampleRate,
RtAudioFormat format, unsigned int *bufferSize,
RtAudio::StreamOptions *options ) override;
};
#endif
#if defined(__LINUX_OSS__)
#include <sys/soundcard.h>
class RtApiOss: public RtApi
{
public:
RtApiOss();
~RtApiOss();
RtAudio::Api getCurrentApi() override { return RtAudio::LINUX_OSS; }
void closeStream( void ) override;
RtAudioErrorType startStream( void ) override;
RtAudioErrorType stopStream( void ) override;
RtAudioErrorType abortStream( void ) override;
// This function is intended for internal use only. It must be
// public because it is called by the internal callback handler,
// which is not a member of RtAudio. External use of this function
// will most likely produce highly undesirable results!
void callbackEvent( void );
private:
void probeDevices( void ) override;
bool probeDeviceInfo( RtAudio::DeviceInfo &info, oss_audioinfo &ainfo );
bool probeDeviceOpen( unsigned int deviceId, StreamMode mode, unsigned int channels,
unsigned int firstChannel, unsigned int sampleRate,
RtAudioFormat format, unsigned int *bufferSize,
RtAudio::StreamOptions *options ) override;
};
#endif
#if defined(__RTAUDIO_DUMMY__)
class RtApiDummy: public RtApi
{
public:
RtApiDummy() { errorText_ = "RtApiDummy: This class provides no functionality."; error( RTAUDIO_WARNING ); }
RtAudio::Api getCurrentApi( void ) override { return RtAudio::RTAUDIO_DUMMY; }
void closeStream( void ) override {}
RtAudioErrorType startStream( void ) override { return RTAUDIO_NO_ERROR; }
RtAudioErrorType stopStream( void ) override { return RTAUDIO_NO_ERROR; }
RtAudioErrorType abortStream( void ) override { return RTAUDIO_NO_ERROR; }
private:
bool probeDeviceOpen( unsigned int /*deviceId*/, StreamMode /*mode*/, unsigned int /*channels*/,
unsigned int /*firstChannel*/, unsigned int /*sampleRate*/,
RtAudioFormat /*format*/, unsigned int * /*bufferSize*/,
RtAudio::StreamOptions * /*options*/ ) override { return false; }
};
#endif
// *************************************************** //
//
// RtAudio definitions.
//
// *************************************************** //
std::string RtAudio :: getVersion( void )
{
return RTAUDIO_VERSION;
}
// Define API names and display names.
// Must be in same order as API enum.
extern "C" {
const char* rtaudio_api_names[][2] = {
{ "unspecified" , "Unknown" },
{ "core" , "CoreAudio" },
{ "alsa" , "ALSA" },
{ "jack" , "Jack" },
{ "pulse" , "Pulse" },
{ "oss" , "OpenSoundSystem" },
{ "asio" , "ASIO" },
{ "wasapi" , "WASAPI" },
{ "ds" , "DirectSound" },
{ "dummy" , "Dummy" },
};
const unsigned int rtaudio_num_api_names =
sizeof(rtaudio_api_names)/sizeof(rtaudio_api_names[0]);
// The order here will control the order of RtAudio's API search in
// the constructor.
extern "C" const RtAudio::Api rtaudio_compiled_apis[] = {
#if defined(__MACOSX_CORE__)
RtAudio::MACOSX_CORE,
#endif
#if defined(__LINUX_ALSA__)
RtAudio::LINUX_ALSA,
#endif
#if defined(__UNIX_JACK__)
RtAudio::UNIX_JACK,
#endif
#if defined(__LINUX_PULSE__)
RtAudio::LINUX_PULSE,
#endif
#if defined(__LINUX_OSS__)
RtAudio::LINUX_OSS,
#endif
#if defined(__WINDOWS_ASIO__)
RtAudio::WINDOWS_ASIO,
#endif
#if defined(__WINDOWS_WASAPI__)
RtAudio::WINDOWS_WASAPI,
#endif
#if defined(__WINDOWS_DS__)
RtAudio::WINDOWS_DS,
#endif
#if defined(__RTAUDIO_DUMMY__)
RtAudio::RTAUDIO_DUMMY,
#endif
RtAudio::UNSPECIFIED,
};
extern "C" const unsigned int rtaudio_num_compiled_apis =
sizeof(rtaudio_compiled_apis)/sizeof(rtaudio_compiled_apis[0])-1;
}
// This is a compile-time check that rtaudio_num_api_names == RtAudio::NUM_APIS.
// If the build breaks here, check that they match.
template<bool b> class StaticAssert { private: StaticAssert() {} };
template<> class StaticAssert<true>{ public: StaticAssert() {} };
class StaticAssertions { StaticAssertions() {
StaticAssert<rtaudio_num_api_names == RtAudio::NUM_APIS>();
}};
void RtAudio :: getCompiledApi( std::vector<RtAudio::Api> &apis )
{
apis = std::vector<RtAudio::Api>(rtaudio_compiled_apis,
rtaudio_compiled_apis + rtaudio_num_compiled_apis);
}
std::string RtAudio :: getApiName( RtAudio::Api api )
{
if (api < 0 || api >= RtAudio::NUM_APIS)
return "";
return rtaudio_api_names[api][0];
}
std::string RtAudio :: getApiDisplayName( RtAudio::Api api )
{
if (api < 0 || api >= RtAudio::NUM_APIS)
return "Unknown";
return rtaudio_api_names[api][1];
}
RtAudio::Api RtAudio :: getCompiledApiByName( const std::string &name )
{
unsigned int i=0;
for (i = 0; i < rtaudio_num_compiled_apis; ++i)
if (name == rtaudio_api_names[rtaudio_compiled_apis[i]][0])
return rtaudio_compiled_apis[i];
return RtAudio::UNSPECIFIED;
}
RtAudio::Api RtAudio :: getCompiledApiByDisplayName( const std::string &name )
{
unsigned int i=0;
for (i = 0; i < rtaudio_num_compiled_apis; ++i)
if (name == rtaudio_api_names[rtaudio_compiled_apis[i]][1])
return rtaudio_compiled_apis[i];
return RtAudio::UNSPECIFIED;
}
void RtAudio :: openRtApi( RtAudio::Api api )
{
if ( rtapi_ )
delete rtapi_;
rtapi_ = 0;
#if defined(__UNIX_JACK__)
if ( api == UNIX_JACK )
rtapi_ = new RtApiJack();
#endif
#if defined(__LINUX_ALSA__)
if ( api == LINUX_ALSA )
rtapi_ = new RtApiAlsa();
#endif
#if defined(__LINUX_PULSE__)
if ( api == LINUX_PULSE )
rtapi_ = new RtApiPulse();
#endif
#if defined(__LINUX_OSS__)
if ( api == LINUX_OSS )
rtapi_ = new RtApiOss();
#endif
#if defined(__WINDOWS_ASIO__)
if ( api == WINDOWS_ASIO )
rtapi_ = new RtApiAsio();
#endif
#if defined(__WINDOWS_WASAPI__)
if ( api == WINDOWS_WASAPI )
rtapi_ = new RtApiWasapi();
#endif
#if defined(__WINDOWS_DS__)
if ( api == WINDOWS_DS )
rtapi_ = new RtApiDs();
#endif
#if defined(__MACOSX_CORE__)
if ( api == MACOSX_CORE )
rtapi_ = new RtApiCore();
#endif
#if defined(__RTAUDIO_DUMMY__)
if ( api == RTAUDIO_DUMMY )
rtapi_ = new RtApiDummy();
#endif
}
RtAudio :: RtAudio( RtAudio::Api api, RtAudioErrorCallback&& errorCallback )
{
rtapi_ = 0;
std::string errorMessage;
if ( api != UNSPECIFIED ) {
// Attempt to open the specified API.
openRtApi( api );
if ( rtapi_ ) {
if ( errorCallback ) rtapi_->setErrorCallback( errorCallback );
return;
}
// No compiled support for specified API value. Issue a warning
// and continue as if no API was specified.
errorMessage = "RtAudio: no compiled support for specified API argument!";
if ( errorCallback )
errorCallback( RTAUDIO_INVALID_USE, errorMessage );
else
std::cerr << '\n' << errorMessage << '\n' << std::endl;
}
// Iterate through the compiled APIs and return as soon as we find
// one with at least one device or we reach the end of the list.
std::vector< RtAudio::Api > apis;
getCompiledApi( apis );
for ( unsigned int i=0; i<apis.size(); i++ ) {
openRtApi( apis[i] );
if ( rtapi_ && (rtapi_->getDeviceNames()).size() > 0 )
break;
}
if ( rtapi_ ) {
if ( errorCallback ) rtapi_->setErrorCallback( errorCallback );
return;
}
// It should not be possible to get here because the preprocessor
// definition __RTAUDIO_DUMMY__ is automatically defined in RtAudio.h
// if no API-specific definitions are passed to the compiler. But just
// in case something weird happens, issue an error message and abort.
errorMessage = "RtAudio: no compiled API support found ... critical error!";
if ( errorCallback )
errorCallback( RTAUDIO_INVALID_USE, errorMessage );
else
std::cerr << '\n' << errorMessage << '\n' << std::endl;
abort();
}
RtAudio :: ~RtAudio()
{
if ( rtapi_ )
delete rtapi_;
}
RtAudioErrorType RtAudio :: openStream( RtAudio::StreamParameters *outputParameters,
RtAudio::StreamParameters *inputParameters,
RtAudioFormat format, unsigned int sampleRate,
unsigned int *bufferFrames,
RtAudioCallback callback, void *userData,
RtAudio::StreamOptions *options )
{
return rtapi_->openStream( outputParameters, inputParameters, format,
sampleRate, bufferFrames, callback,
userData, options );
}
// *************************************************** //
//
// Public RtApi definitions (see end of file for
// private or protected utility functions).
//
// *************************************************** //
RtApi :: RtApi()
{
clearStreamInfo();
MUTEX_INITIALIZE( &stream_.mutex );
errorCallback_ = 0;
showWarnings_ = true;
currentDeviceId_ = 129;
}
RtApi :: ~RtApi()
{
MUTEX_DESTROY( &stream_.mutex );
}
RtAudioErrorType RtApi :: openStream( RtAudio::StreamParameters *oParams,
RtAudio::StreamParameters *iParams,
RtAudioFormat format, unsigned int sampleRate,
unsigned int *bufferFrames,
RtAudioCallback callback, void *userData,
RtAudio::StreamOptions *options )
{
if ( stream_.state != STREAM_CLOSED ) {
errorText_ = "RtApi::openStream: a stream is already open!";
return error( RTAUDIO_INVALID_USE );
}
// Clear stream information potentially left from a previously open stream.
clearStreamInfo();
if ( oParams && oParams->nChannels < 1 ) {
errorText_ = "RtApi::openStream: a non-NULL output StreamParameters structure cannot have an nChannels value less than one.";
return error( RTAUDIO_INVALID_PARAMETER );
}
if ( iParams && iParams->nChannels < 1 ) {
errorText_ = "RtApi::openStream: a non-NULL input StreamParameters structure cannot have an nChannels value less than one.";
return error( RTAUDIO_INVALID_PARAMETER );
}
if ( oParams == NULL && iParams == NULL ) {
errorText_ = "RtApi::openStream: input and output StreamParameters structures are both NULL!";
return error( RTAUDIO_INVALID_PARAMETER );
}
if ( formatBytes(format) == 0 ) {
errorText_ = "RtApi::openStream: 'format' parameter value is undefined.";
return error( RTAUDIO_INVALID_PARAMETER );
}
// Scan devices if none currently listed.
if ( deviceList_.size() == 0 ) probeDevices();
unsigned int m, oChannels = 0;
if ( oParams ) {
oChannels = oParams->nChannels;
// Verify that the oParams->deviceId is found in our list
for ( m=0; m<deviceList_.size(); m++ ) {
if ( deviceList_[m].ID == oParams->deviceId ) break;
}
if ( m == deviceList_.size() ) {
errorText_ = "RtApi::openStream: output device ID is invalid.";
return error( RTAUDIO_INVALID_PARAMETER );
}
}
unsigned int iChannels = 0;
if ( iParams ) {
iChannels = iParams->nChannels;
for ( m=0; m<deviceList_.size(); m++ ) {
if ( deviceList_[m].ID == iParams->deviceId ) break;
}
if ( m == deviceList_.size() ) {
errorText_ = "RtApi::openStream: input device ID is invalid.";
return error( RTAUDIO_INVALID_PARAMETER );
}
}
bool result;
if ( oChannels > 0 ) {
result = probeDeviceOpen( oParams->deviceId, OUTPUT, oChannels, oParams->firstChannel,
sampleRate, format, bufferFrames, options );
if ( result == false )
return error( RTAUDIO_SYSTEM_ERROR );
}
if ( iChannels > 0 ) {
result = probeDeviceOpen( iParams->deviceId, INPUT, iChannels, iParams->firstChannel,
sampleRate, format, bufferFrames, options );
if ( result == false )
return error( RTAUDIO_SYSTEM_ERROR );
}
stream_.callbackInfo.callback = (void *) callback;
stream_.callbackInfo.userData = userData;
if ( options ) options->numberOfBuffers = stream_.nBuffers;
stream_.state = STREAM_STOPPED;
return RTAUDIO_NO_ERROR;
}
void RtApi :: probeDevices( void )
{
// This function MUST be implemented in all subclasses! Within each
// API, this function will be used to:
// - enumerate the devices and fill or update our
// std::vector< RtAudio::DeviceInfo> deviceList_ class variable
// - store corresponding (usually API-specific) identifiers that
// are needed to open each device
// - make sure that the default devices are properly identified
// within the deviceList_ (unless API-specific functions are
// available for this purpose).
//
// The function should not reprobe devices that have already been
// found. The function must properly handle devices that are removed
// or added.
//
// Ideally, we would also configure callback functions to be invoked
// when devices are added or removed (which could be used to inform
// clients about changes). However, none of the APIs currently
// support notification of _new_ devices and I don't see the
// usefulness of having this work only for device removal.
return;
}
unsigned int RtApi :: getDeviceCount( void )
{
probeDevices();
return (unsigned int)deviceList_.size();
}
std::vector<unsigned int> RtApi :: getDeviceIds( void )
{
probeDevices();
// Copy device IDs into output vector.
std::vector<unsigned int> deviceIds;
for ( unsigned int m=0; m<deviceList_.size(); m++ )
deviceIds.push_back( deviceList_[m].ID );
return deviceIds;
}
std::vector<std::string> RtApi :: getDeviceNames( void )
{
probeDevices();
// Copy device names into output vector.
std::vector<std::string> deviceNames;
for ( unsigned int m=0; m<deviceList_.size(); m++ )
deviceNames.push_back( deviceList_[m].name );
return deviceNames;
}
unsigned int RtApi :: getDefaultInputDevice( void )
{
// Should be reimplemented in subclasses if necessary.
if ( deviceList_.size() == 0 ) probeDevices();
for ( unsigned int i = 0; i < deviceList_.size(); i++ ) {
if ( deviceList_[i].isDefaultInput )
return deviceList_[i].ID;
}
// If not found, find the first device with input channels, set it
// as the default, and return the ID.
for ( unsigned int i = 0; i < deviceList_.size(); i++ ) {
if ( deviceList_[i].inputChannels > 0 ) {
deviceList_[i].isDefaultInput = true;
return deviceList_[i].ID;
}
}
return 0;
}
unsigned int RtApi :: getDefaultOutputDevice( void )
{
// Should be reimplemented in subclasses if necessary.
if ( deviceList_.size() == 0 ) probeDevices();
for ( unsigned int i = 0; i < deviceList_.size(); i++ ) {
if ( deviceList_[i].isDefaultOutput )
return deviceList_[i].ID;
}
// If not found, find the first device with output channels, set it
// as the default, and return the ID.
for ( unsigned int i = 0; i < deviceList_.size(); i++ ) {
if ( deviceList_[i].outputChannels > 0 ) {
deviceList_[i].isDefaultOutput = true;
return deviceList_[i].ID;
}
}
return 0;
}
RtAudio::DeviceInfo RtApi :: getDeviceInfo( unsigned int deviceId )
{
if ( deviceList_.size() == 0 ) probeDevices();
for ( unsigned int m=0; m<deviceList_.size(); m++ ) {
if ( deviceList_[m].ID == deviceId )
return deviceList_[m];
}
errorText_ = "RtApi::getDeviceInfo: deviceId argument not found.";
error( RTAUDIO_INVALID_PARAMETER );
return RtAudio::DeviceInfo();
}
void RtApi :: closeStream( void )
{
// MUST be implemented in subclasses!
return;
}
bool RtApi :: probeDeviceOpen( unsigned int /*deviceId*/, StreamMode /*mode*/, unsigned int /*channels*/,
unsigned int /*firstChannel*/, unsigned int /*sampleRate*/,
RtAudioFormat /*format*/, unsigned int * /*bufferSize*/,
RtAudio::StreamOptions * /*options*/ )
{
// MUST be implemented in subclasses!
return FAILURE;
}
void RtApi :: tickStreamTime( void )
{
// Subclasses that do not provide their own implementation of
// getStreamTime should call this function once per buffer I/O to
// provide basic stream time support.
stream_.streamTime += ( stream_.bufferSize * 1.0 / stream_.sampleRate );
/*
#if defined( HAVE_GETTIMEOFDAY )
gettimeofday( &stream_.lastTickTimestamp, NULL );
#endif
*/
}
long RtApi :: getStreamLatency( void )
{
long totalLatency = 0;
if ( stream_.mode == OUTPUT || stream_.mode == DUPLEX )
totalLatency = stream_.latency[0];
if ( stream_.mode == INPUT || stream_.mode == DUPLEX )
totalLatency += stream_.latency[1];
return totalLatency;
}
/*
double RtApi :: getStreamTime( void )
{
#if defined( HAVE_GETTIMEOFDAY )
// Return a very accurate estimate of the stream time by
// adding in the elapsed time since the last tick.
struct timeval then;
struct timeval now;
if ( stream_.state != STREAM_RUNNING || stream_.streamTime == 0.0 )
return stream_.streamTime;
gettimeofday( &now, NULL );
then = stream_.lastTickTimestamp;
return stream_.streamTime +
((now.tv_sec + 0.000001 * now.tv_usec) -
(then.tv_sec + 0.000001 * then.tv_usec));
#else
return stream_.streamTime;
#endif
}
*/
void RtApi :: setStreamTime( double time )
{
if ( time >= 0.0 )
stream_.streamTime = time;
/*
#if defined( HAVE_GETTIMEOFDAY )
gettimeofday( &stream_.lastTickTimestamp, NULL );
#endif
*/
}
unsigned int RtApi :: getStreamSampleRate( void )
{
if ( isStreamOpen() ) return stream_.sampleRate;
else return 0;
}
// *************************************************** //
//
// OS/API-specific methods.
//
// *************************************************** //
#if defined(__MACOSX_CORE__)
#include <unistd.h>
// The OS X CoreAudio API is designed to use a separate callback
// procedure for each of its audio devices. A single RtAudio duplex
// stream using two different devices is supported here, though it
// cannot be guaranteed to always behave correctly because we cannot
// synchronize these two callbacks.
//
// A property listener is installed for over/underrun information.
// However, no functionality is currently provided to allow property
// listeners to trigger user handlers because it is unclear what could
// be done if a critical stream parameter (buffer size, sample rate,
// device disconnect) notification arrived. The listeners entail
// quite a bit of extra code and most likely, a user program wouldn't
// be prepared for the result anyway. However, we do provide a flag
// to the client callback function to inform of an over/underrun.
// A structure to hold various information related to the CoreAudio API
// implementation.
struct CoreHandle {
AudioDeviceID id[2]; // device ids
#if defined( MAC_OS_X_VERSION_10_5 ) && ( MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_5 )
AudioDeviceIOProcID procId[2];
#endif
UInt32 iStream[2]; // device stream index (or first if using multiple)
UInt32 nStreams[2]; // number of streams to use
bool xrun[2];
char *deviceBuffer;
pthread_cond_t condition;
int drainCounter; // Tracks callback counts when draining
bool internalDrain; // Indicates if stop is initiated from callback or not.
bool xrunListenerAdded[2];
bool disconnectListenerAdded[2];
CoreHandle()
:deviceBuffer(0), drainCounter(0), internalDrain(false) { nStreams[0] = 1; nStreams[1] = 1; id[0] = 0; id[1] = 0; procId[0] = 0; procId[1] = 0; xrun[0] = false; xrun[1] = false; xrunListenerAdded[0] = false; xrunListenerAdded[1] = false; disconnectListenerAdded[0] = false; disconnectListenerAdded[1] = false; }
};
#if defined( MAC_OS_VERSION_12_0 ) && ( MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_VERSION_12_0 )
#define KAUDIOOBJECTPROPERTYELEMENT kAudioObjectPropertyElementMain
#else
#define KAUDIOOBJECTPROPERTYELEMENT kAudioObjectPropertyElementMaster // deprecated with macOS 12
#endif
RtApiCore:: RtApiCore()
{
#if defined( AVAILABLE_MAC_OS_X_VERSION_10_6_AND_LATER )
// This is a largely undocumented but absolutely necessary
// requirement starting with OS-X 10.6. If not called, queries and
// updates to various audio device properties are not handled
// correctly.
CFRunLoopRef theRunLoop = NULL;
AudioObjectPropertyAddress property = { kAudioHardwarePropertyRunLoop,
kAudioObjectPropertyScopeGlobal,
KAUDIOOBJECTPROPERTYELEMENT };
OSStatus result = AudioObjectSetPropertyData( kAudioObjectSystemObject, &property, 0, NULL, sizeof(CFRunLoopRef), &theRunLoop);
if ( result != noErr ) {
errorText_ = "RtApiCore::RtApiCore: error setting run loop property!";
error( RTAUDIO_SYSTEM_ERROR );
}
#endif