添加一些关于midi播放的项目

2025-03-24 14:30:56 +08:00
parent e31eb22077
commit 498b4ef13b
699 changed files with 186162 additions and 1 deletions
@@ -0,0 +1,152 @@
+/******************************************/
+/*
+  playraw.cpp
+  by Gary P. Scavone, 2007
+
+  Play a specified raw file.  It is necessary
+  that the file be of the same data format as
+  defined below.
+*/
+/******************************************/
+
+#include "RtAudio.h"
+#include <iostream>
+#include <cstdlib>
+#include <cstring>
+#include <stdio.h>
+
+/*
+typedef char  MY_TYPE;
+#define FORMAT RTAUDIO_SINT8
+#define SCALE  127.0
+*/
+
+typedef signed short  MY_TYPE;
+#define FORMAT RTAUDIO_SINT16
+#define SCALE  32767.0
+
+/*
+typedef S24 MY_TYPE;
+#define FORMAT RTAUDIO_SINT24
+#define SCALE  8388607.0
+
+typedef signed int  MY_TYPE;
+#define FORMAT RTAUDIO_SINT32
+#define SCALE  2147483647.0
+
+typedef float  MY_TYPE;
+#define FORMAT RTAUDIO_FLOAT32
+#define SCALE  1.0;
+
+typedef double  MY_TYPE;
+#define FORMAT RTAUDIO_FLOAT64
+#define SCALE  1.0;
+*/
+
+// Platform-dependent sleep routines.
+#if defined( WIN32 )
+  #include <windows.h>
+  #define SLEEP( milliseconds ) Sleep( (DWORD) milliseconds ) 
+#else // Unix variants
+  #include <unistd.h>
+  #define SLEEP( milliseconds ) usleep( (unsigned long) (milliseconds * 1000.0) )
+#endif
+
+void usage( void ) {
+  // Error function in case of incorrect command-line
+  // argument specifications
+  std::cout << "\nuseage: playraw N fs file <device> <channelOffset>\n";
+  std::cout << "    where N = number of channels,\n";
+  std::cout << "    fs = the sample rate, \n";
+  std::cout << "    file = the raw file to play,\n";
+  std::cout << "    device = optional device to use (default = 0),\n";
+  std::cout << "    and channelOffset = an optional channel offset on the device (default = 0).\n\n";
+  exit( 0 );
+}
+
+struct OutputData {
+  FILE *fd;
+  unsigned int channels;
+};
+
+// Interleaved buffers
+int output( void *outputBuffer, void * /*inputBuffer*/, unsigned int nBufferFrames,
+            double /*streamTime*/, RtAudioStreamStatus /*status*/, void *data )
+{
+  OutputData *oData = (OutputData*) data;
+
+  // In general, it's not a good idea to do file input in the audio
+  // callback function but I'm doing it here because I don't know the
+  // length of the file we are reading.
+  unsigned int count = fread( outputBuffer, oData->channels * sizeof( MY_TYPE ), nBufferFrames, oData->fd);
+  if ( count < nBufferFrames ) {
+    unsigned int bytes = (nBufferFrames - count) * oData->channels * sizeof( MY_TYPE );
+    unsigned int startByte = count * oData->channels * sizeof( MY_TYPE );
+    memset( (char *)(outputBuffer)+startByte, 0, bytes );
+    return 1;
+  }
+
+  return 0;
+}
+
+int main( int argc, char *argv[] )
+{
+  unsigned int channels, fs, bufferFrames, device = 0, offset = 0;
+  char *file;
+
+  // minimal command-line checking
+  if ( argc < 4 || argc > 6 ) usage();
+
+  RtAudio dac;
+  if ( dac.getDeviceCount() < 1 ) {
+    std::cout << "\nNo audio devices found!\n";
+    exit( 0 );
+  }
+
+  channels = (unsigned int) atoi( argv[1]) ;
+  fs = (unsigned int) atoi( argv[2] );
+  file = argv[3];
+  if ( argc > 4 )
+    device = (unsigned int) atoi( argv[4] );
+  if ( argc > 5 )
+    offset = (unsigned int) atoi( argv[5] );
+
+  OutputData data;
+  data.fd = fopen( file, "rb" );
+  if ( !data.fd ) {
+    std::cout << "Unable to find or open file!\n";
+    exit( 1 );
+  }
+
+  // Set our stream parameters for output only.
+  bufferFrames = 512;
+  RtAudio::StreamParameters oParams;
+  oParams.deviceId = device;
+  oParams.nChannels = channels;
+  oParams.firstChannel = offset;
+
+  if ( device == 0 )
+    oParams.deviceId = dac.getDefaultOutputDevice();
+
+  data.channels = channels;
+  try {
+    dac.openStream( &oParams, NULL, FORMAT, fs, &bufferFrames, &output, (void *)&data );
+    dac.startStream();
+  }
+  catch ( RtAudioError& e ) {
+    std::cout << '\n' << e.getMessage() << '\n' << std::endl;
+    goto cleanup;
+  }
+
+  std::cout << "\nPlaying raw file " << file << " (buffer frames = " << bufferFrames << ")." << std::endl;
+  while ( 1 ) {
+    SLEEP( 100 ); // wake every 100 ms to check if we're done
+    if ( dac.isStreamRunning() == false ) break;
+  }
+
+ cleanup:
+  fclose( data.fd );
+  dac.closeStream();
+
+  return 0;
+}