initial commit

main_buffer_manager_class.cpp

@@ -0,0 +1,79 @@
+#include <SDL2/SDL.h>
+#include <SDL2/SDL_image.h>
+#include <SDL2/SDL_timer.h>
+#include <SDL2/SDL_ttf.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <cmath>
+#include <unistd.h>
+#include <iostream>
+#include <chrono>
+#include <pulse/simple.h>
+#include <pulse/error.h>
+#include "scope.h"
+
+// Pulse
+static const pa_sample_spec my_pa_spec = {
+  .format = PA_SAMPLE_S16LE,
+  .rate = 44100,
+  .channels = 1
+  };
+
+// audio buffer 
+main_buffer_manager_class::main_buffer_manager_class()
+  {
+  my_read_main_buffer = NULL;
+  }
+
+main_buffer_manager_class::~main_buffer_manager_class()
+  {
+  if (my_read_main_buffer != NULL)
+    {
+    free(my_read_main_buffer);
+    }
+  }
+
+Sint16 *main_buffer_manager_class::initial_preparation()
+  {
+  my_read_main_buffer = (Sint16 *)malloc ((sizeof(Sint16) * READ_BUFFER_SIZE));
+  if (my_read_main_buffer == NULL)
+    {
+    printf ("cannot allocate read buffer\n");
+    perror ("error is");
+    return NULL;
+    }
+
+  // Open pulse
+  pulse_s = pa_simple_new(NULL,"scope sound", PA_STREAM_RECORD, NULL, "record",
+    &my_pa_spec, NULL, NULL, &function_return);
+
+  if (pulse_s == NULL) {
+    printf("pa_simple_new() failed: %s\n", pa_strerror(function_return));
+    return NULL;
+    }
+ 
+  return my_read_main_buffer;
+  }
+
+Sint16 *main_buffer_manager_class::read_main_buffer()
+  {
+
+  // grab the buffer from the audio device 
+  printf("about to grab sound\n");
+  if (pa_simple_read(pulse_s,  (Uint8 *)my_read_main_buffer,
+    (READ_BUFFER_SIZE * sizeof(Sint16)), &function_return) < 0) {
+      printf("sound read failed %s\n", pa_strerror(function_return));
+      return NULL;
+    }
+
+  printf("just grabbed the buffer from device\n");
+  // Turn the volume down
+  for (main_buffer_index = 0; main_buffer_index < READ_BUFFER_SIZE;
+   main_buffer_index += 1)
+    {
+    main_buffer_hold = (Sint16)(*(my_read_main_buffer + main_buffer_index) * MAIN_VOLUME);
+    *(my_read_main_buffer + main_buffer_index) = main_buffer_hold;
+    }
+
+  return my_read_main_buffer;
+  }