1 /******************************************/
4 by Gary P. Scavone, 2006
6 This program will output sawtooth waveforms
7 of different frequencies on each channel.
9 /******************************************/
17 #define FORMAT RTAUDIO_SINT8
21 typedef signed short MY_TYPE;
22 #define FORMAT RTAUDIO_SINT16
27 #define FORMAT RTAUDIO_SINT24
28 #define SCALE 8388607.0
30 typedef signed long MY_TYPE;
31 #define FORMAT RTAUDIO_SINT32
32 #define SCALE 2147483647.0
34 typedef float MY_TYPE;
35 #define FORMAT RTAUDIO_FLOAT32
38 typedef double MY_TYPE;
39 #define FORMAT RTAUDIO_FLOAT64
43 // Platform-dependent sleep routines.
46 #define SLEEP( milliseconds ) Sleep( (DWORD) milliseconds )
47 #else // Unix variants
49 #define SLEEP( milliseconds ) usleep( (unsigned long) (milliseconds * 1000.0) )
52 #define BASE_RATE 0.005
56 // Error function in case of incorrect command-line
57 // argument specifications
58 std::cout << "\nuseage: playsaw N fs <device> <channelOffset> <time>\n";
59 std::cout << " where N = number of channels,\n";
60 std::cout << " fs = the sample rate,\n";
61 std::cout << " device = optional device to use (default = 0),\n";
62 std::cout << " channelOffset = an optional channel offset on the device (default = 0),\n";
63 std::cout << " and time = an optional time duration in seconds (default = no limit).\n\n";
67 void errorCallback( RtAudioError::Type /*type*/, const std::string &errorText )
69 // This example error handling function does exactly the same thing
70 // as the embedded RtAudio::error() function.
71 std::cout << "in errorCallback" << std::endl;
72 //if ( type == RtAudioError::WARNING )
73 std::cerr << '\n' << errorText << "\n\n";
74 //else if ( type != RtAudioError::WARNING )
75 //throw( RtAudioError( errorText, type ) );
78 unsigned int channels;
79 RtAudio::StreamOptions options;
80 unsigned int frameCounter = 0;
81 bool checkCount = false;
82 unsigned int nFrames = 0;
83 const unsigned int callbackReturnValue = 2;
84 double streamTimePrintIncrement = 1.0; // seconds
85 double streamTimePrintTime = 1.0; // seconds
87 //#define USE_INTERLEAVED
88 #if defined( USE_INTERLEAVED )
90 // Interleaved buffers
91 int saw( void *outputBuffer, void *inputBuffer, unsigned int nBufferFrames,
92 double streamTime, RtAudioStreamStatus status, void *data )
95 extern unsigned int channels;
96 MY_TYPE *buffer = (MY_TYPE *) outputBuffer;
97 double *lastValues = (double *) data;
100 std::cout << "Stream underflow detected!" << std::endl;
102 if ( streamTime >= streamTimePrintTime ) {
103 std::cout << "streamTime = " << streamTime << std::endl;
104 streamTimePrintTime += streamTimePrintIncrement;
107 for ( i=0; i<nBufferFrames; i++ ) {
108 for ( j=0; j<channels; j++ ) {
109 *buffer++ = (MY_TYPE) (lastValues[j] * SCALE * 0.5);
110 lastValues[j] += BASE_RATE * (j+1+(j*0.1));
111 if ( lastValues[j] >= 1.0 ) lastValues[j] -= 2.0;
115 frameCounter += nBufferFrames;
116 if ( checkCount && ( frameCounter >= nFrames ) ) return callbackReturnValue;
120 #else // Use non-interleaved buffers
122 int saw( void *outputBuffer, void * /*inputBuffer*/, unsigned int nBufferFrames,
123 double streamTime, RtAudioStreamStatus status, void *data )
126 extern unsigned int channels;
127 MY_TYPE *buffer = (MY_TYPE *) outputBuffer;
128 double *lastValues = (double *) data;
131 std::cout << "Stream underflow detected!" << std::endl;
133 if ( streamTime >= streamTimePrintTime ) {
134 std::cout << "streamTime = " << streamTime << std::endl;
135 streamTimePrintTime += streamTimePrintIncrement;
139 for ( j=0; j<channels; j++ ) {
140 increment = BASE_RATE * (j+1+(j*0.1));
141 for ( i=0; i<nBufferFrames; i++ ) {
142 *buffer++ = (MY_TYPE) (lastValues[j] * SCALE * 0.5);
143 lastValues[j] += increment;
144 if ( lastValues[j] >= 1.0 ) lastValues[j] -= 2.0;
148 frameCounter += nBufferFrames;
149 if ( checkCount && ( frameCounter >= nFrames ) ) return callbackReturnValue;
154 int main( int argc, char *argv[] )
156 unsigned int bufferFrames, fs, device = 0, offset = 0;
158 // minimal command-line checking
159 if (argc < 3 || argc > 6 ) usage();
162 if ( dac.getDeviceCount() < 1 ) {
163 std::cout << "\nNo audio devices found!\n";
167 channels = (unsigned int) atoi( argv[1] );
168 fs = (unsigned int) atoi( argv[2] );
170 device = (unsigned int) atoi( argv[3] );
172 offset = (unsigned int) atoi( argv[4] );
174 nFrames = (unsigned int) (fs * atof( argv[5] ));
175 if ( nFrames > 0 ) checkCount = true;
177 double *data = (double *) calloc( channels, sizeof( double ) );
179 // Let RtAudio print messages to stderr.
180 dac.showWarnings( true );
182 // Set our stream parameters for output only.
184 RtAudio::StreamParameters oParams;
185 oParams.deviceId = device;
186 oParams.nChannels = channels;
187 oParams.firstChannel = offset;
190 oParams.deviceId = dac.getDefaultOutputDevice();
192 options.flags = RTAUDIO_HOG_DEVICE;
193 options.flags |= RTAUDIO_SCHEDULE_REALTIME;
194 #if !defined( USE_INTERLEAVED )
195 options.flags |= RTAUDIO_NONINTERLEAVED;
198 dac.openStream( &oParams, NULL, FORMAT, fs, &bufferFrames, &saw, (void *)data, &options, &errorCallback );
199 if ( dac.isStreamOpen() == false ) goto cleanup;
202 // catch ( RtAudioError& e ) {
208 while ( dac.isStreamRunning() == true ) SLEEP( 100 );
212 //std::cout << "Stream latency = " << dac.getStreamLatency() << "\n" << std::endl;
213 std::cout << "\nPlaying ... press <enter> to quit (buffer size = " << bufferFrames << ").\n";
214 std::cin.get( input );
222 catch ( RtAudioError& e ) {
229 if ( dac.isStreamOpen() ) dac.closeStream();