Version 4.3.0

projects/examples/duplex.cpp

@@ -0,0 +1,131 @@
+/******************************************/
+/*
+  duplex.cpp
+  by Gary P. Scavone, 2006-2007.
+
+  This program opens a duplex stream and passes
+  input directly through to the output.
+*/
+/******************************************/
+
+#include "RtAudio.h"
+#include <iostream>
+
+/*
+typedef signed long  MY_TYPE;
+#define FORMAT RTAUDIO_SINT24
+
+typedef char  MY_TYPE;
+#define FORMAT RTAUDIO_SINT8
+
+typedef signed short  MY_TYPE;
+#define FORMAT RTAUDIO_SINT16
+
+typedef signed long  MY_TYPE;
+#define FORMAT RTAUDIO_SINT32
+
+typedef float  MY_TYPE;
+#define FORMAT RTAUDIO_FLOAT32
+*/
+
+typedef double  MY_TYPE;
+#define FORMAT RTAUDIO_FLOAT64
+
+void usage( void ) {
+  // Error function in case of incorrect command-line
+  // argument specifications
+  std::cout << "\nuseage: duplex N fs <iDevice> <oDevice> <iChannelOffset> <oChannelOffset>\n";
+  std::cout << "    where N = number of channels,\n";
+  std::cout << "    fs = the sample rate,\n";
+  std::cout << "    iDevice = optional input device to use (default = 0),\n";
+  std::cout << "    oDevice = optional output device to use (default = 0),\n";
+  std::cout << "    iChannelOffset = an optional input channel offset (default = 0),\n";
+  std::cout << "    and oChannelOffset = optional output channel offset (default = 0).\n\n";
+  exit( 0 );
+}
+
+int inout( void *outputBuffer, void *inputBuffer, unsigned int nBufferFrames,
+           double streamTime, RtAudioStreamStatus status, void *data )
+{
+  // Since the number of input and output channels is equal, we can do
+  // a simple buffer copy operation here.
+  if ( status ) std::cout << "Stream over/underflow detected." << std::endl;
+
+  unsigned long *bytes = (unsigned long *) data;
+  memcpy( outputBuffer, inputBuffer, *bytes );
+  return 0;
+}
+
+int main(int argc, char *argv[])
+{
+  unsigned int channels, fs, bufferBytes, oDevice = 0, iDevice = 0, iOffset = 0, oOffset = 0;
+
+  // Minimal command-line checking
+  if (argc < 3 || argc > 7 ) usage();
+
+  RtAudio adac;
+  if ( adac.getDeviceCount() < 1 ) {
+    std::cout << "\nNo audio devices found!\n";
+    exit( 0 );
+  }
+
+  channels = (unsigned int) atoi(argv[1]);
+  fs = (unsigned int) atoi(argv[2]);
+  if ( argc > 3 )
+    iDevice = (unsigned int) atoi(argv[3]);
+  if ( argc > 4 )
+    oDevice = (unsigned int) atoi(argv[4]);
+  if ( argc > 5 )
+    iOffset = (unsigned int) atoi(argv[5]);
+  if ( argc > 6 )
+    oOffset = (unsigned int) atoi(argv[6]);
+
+  // Let RtAudio print messages to stderr.
+  adac.showWarnings( true );
+
+  // Set the same number of channels for both input and output.
+  unsigned int bufferFrames = 512;
+  RtAudio::StreamParameters iParams, oParams;
+  iParams.deviceId = iDevice;
+  iParams.nChannels = channels;
+  iParams.firstChannel = iOffset;
+  oParams.deviceId = oDevice;
+  oParams.nChannels = channels;
+  oParams.firstChannel = oOffset;
+
+  RtAudio::StreamOptions options;
+  //options.flags |= RTAUDIO_NONINTERLEAVED;
+
+  try {
+    adac.openStream( &oParams, &iParams, FORMAT, fs, &bufferFrames, &inout, (void *)&bufferBytes, &options );
+  }
+  catch ( RtError& e ) {
+    std::cout << '\n' << e.getMessage() << '\n' << std::endl;
+    exit( 0 );
+  }
+
+  bufferBytes = bufferFrames * channels * sizeof( MY_TYPE );
+
+  // Test RtAudio functionality for reporting latency.
+  std::cout << "\nStream latency = " << adac.getStreamLatency() << " frames" << std::endl;
+
+  try {
+    adac.startStream();
+
+    char input;
+    std::cout << "\nRunning ... press <enter> to quit (buffer frames = " << bufferFrames << ").\n";
+    std::cin.get(input);
+
+    // Stop the stream.
+    adac.stopStream();
+  }
+  catch ( RtError& e ) {
+    std::cout << '\n' << e.getMessage() << '\n' << std::endl;
+    goto cleanup;
+  }
+
+ cleanup:
+  if ( adac.isStreamOpen() ) adac.closeStream();
+
+  return 0;
+}