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.
44 #if defined( __WINDOWS_ASIO__ ) || defined( __WINDOWS_DS__ )
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 unsigned int channels;
68 RtAudio::StreamOptions options;
69 unsigned int frameCounter = 0;
70 bool checkCount = false;
71 unsigned int nFrames = 0;
72 const unsigned int callbackReturnValue = 1;
74 //#define USE_INTERLEAVED
75 #if defined( USE_INTERLEAVED )
77 // Interleaved buffers
78 int saw( void *outputBuffer, void *inputBuffer, unsigned int nBufferFrames,
79 double streamTime, RtAudioStreamStatus status, void *data )
82 extern unsigned int channels;
83 MY_TYPE *buffer = (MY_TYPE *) outputBuffer;
84 double *lastValues = (double *) data;
87 std::cout << "Stream underflow detected!" << std::endl;
89 for ( i=0; i<nBufferFrames; i++ ) {
90 for ( j=0; j<channels; j++ ) {
91 *buffer++ = (MY_TYPE) (lastValues[j] * SCALE);
92 lastValues[j] += BASE_RATE * (j+1+(j*0.1));
93 if ( lastValues[j] >= 1.0 ) lastValues[j] -= 2.0;
97 frameCounter += nBufferFrames;
98 if ( checkCount && ( frameCounter >= nFrames ) ) return callbackReturnValue;
102 #else // Use non-interleaved buffers
104 int saw( void *outputBuffer, void *inputBuffer, unsigned int nBufferFrames,
105 double streamTime, RtAudioStreamStatus status, void *data )
108 extern unsigned int channels;
109 MY_TYPE *buffer = (MY_TYPE *) outputBuffer;
110 double *lastValues = (double *) data;
113 std::cout << "Stream underflow detected!" << std::endl;
116 for ( j=0; j<channels; j++ ) {
117 increment = BASE_RATE * (j+1+(j*0.1));
118 for ( i=0; i<nBufferFrames; i++ ) {
119 *buffer++ = (MY_TYPE) (lastValues[j] * SCALE);
120 lastValues[j] += increment;
121 if ( lastValues[j] >= 1.0 ) lastValues[j] -= 2.0;
125 frameCounter += nBufferFrames;
126 if ( checkCount && ( frameCounter >= nFrames ) ) return callbackReturnValue;
131 int main( int argc, char *argv[] )
133 unsigned int bufferFrames, fs, device = 0, offset = 0;
135 // minimal command-line checking
136 if (argc < 3 || argc > 6 ) usage();
139 if ( dac.getDeviceCount() < 1 ) {
140 std::cout << "\nNo audio devices found!\n";
144 channels = (unsigned int) atoi( argv[1] );
145 fs = (unsigned int) atoi( argv[2] );
147 device = (unsigned int) atoi( argv[3] );
149 offset = (unsigned int) atoi( argv[4] );
151 nFrames = (unsigned int) (fs * atof( argv[5] ));
152 if ( nFrames > 0 ) checkCount = true;
154 double *data = (double *) calloc( channels, sizeof( double ) );
156 // Let RtAudio print messages to stderr.
157 dac.showWarnings( true );
159 // Set our stream parameters for output only.
161 RtAudio::StreamParameters oParams;
162 oParams.deviceId = device;
163 oParams.nChannels = channels;
164 oParams.firstChannel = offset;
166 options.flags = RTAUDIO_HOG_DEVICE;
167 options.flags |= RTAUDIO_SCHEDULE_REALTIME;
168 #if !defined( USE_INTERLEAVED )
169 options.flags |= RTAUDIO_NONINTERLEAVED;
172 dac.openStream( &oParams, NULL, FORMAT, fs, &bufferFrames, &saw, (void *)data, &options );
175 catch ( RtError& e ) {
181 while ( dac.isStreamRunning() == true ) SLEEP( 100 );
185 //std::cout << "Stream latency = " << dac.getStreamLatency() << "\n" << std::endl;
186 std::cout << "\nPlaying ... press <enter> to quit (buffer size = " << bufferFrames << ").\n";
187 std::cin.get( input );
193 catch ( RtError& e ) {
199 if ( dac.isStreamOpen() ) dac.closeStream();