1 files changed, 206 insertions, 0 deletions
diff --git a/K_belwagen/index.c b/K_belwagen/index.c
new file mode 100644
index 00000000..9a15c7c3
--- /dev/null
+++ b/K_belwagen/index.c
@@ -0,0 +1,206 @@
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <math.h>
+
+#include <jack/jack.h>
+
+const double PI = 3.14;
+
+/*Our output port*/
+jack_port_t *output_port;
+
+typedef jack_default_audio_sample_t sample_t;
+
+/*The current sample rate*/
+jack_nframes_t sr;
+
+/*samples in cycle*/
+jack_nframes_t samincy;
+/*the current offset*/
+long offset=0;
+
+/*frequency of our sound*/
+int tone = 262;
+int length = 1000000;
+
+char const *name = "<undefined>";
+
+int process (jack_nframes_t nframes, void *arg){
+  /*grab our output buffer*/
+  sample_t *out = (sample_t *) jack_port_get_buffer 
+                               (output_port, nframes);
+
+  int _tone = tone > 0 ? tone : 1;
+
+  /*For each required sample*/
+  for(jack_nframes_t i=0;i < nframes;i++){
+    /*Copy the sample at the current position in the cycle to the buffer*/
+
+    jack_nframes_t samincy = sr / _tone;
+    sample_t scale = 2 * PI / samincy;
+    out[i] = sin(offset * scale);
+
+    /*and increment the offset, wrapping to 0 if needed*/
+    /*(Dumb increment fixed thanks to Jussi Sainio)*/
+    offset++;
+    if(offset >= samincy)
+      offset = 0;    
+  }
+           
+  return 0;      
+}
+
+int srate (jack_nframes_t nframes, void *arg){
+  printf ("the sample rate is now %lu/sec\n", nframes);
+  sr=nframes;
+  return 0;
+}
+
+void error (const char *desc){
+  fprintf (stderr, "JACK error: %s\n", desc);
+}
+
+void jack_shutdown (void *arg){
+  exit (1);
+}
+
+void usage(void) {
+  fprintf (stderr, "usage: %s [Hz [ms]]\n", name);
+}
+
+int main (int argc, char *argv[]){
+  jack_client_t *client;
+  const char **ports;
+
+  name = argv[0];
+  
+  if (argc < 2) {
+    usage();
+    return 1;
+  }
+  if (argc >= 2) {
+    tone = atoi(argv[1]);
+    if (tone == 0) {
+      usage();
+      return 1;
+    } 
+    fprintf(stderr, "tone: %dHz\n", tone);
+    if (argc >= 3) {
+      length = atoi(argv[2]) * 1000;
+      if (length == 0) {
+        usage();
+        return 1;
+      } 
+      fprintf(stderr, "length: %dms\n", length/1000);
+    }
+  }
+  
+  /* tell the JACK server to call error() whenever it
+     experiences an error.  Notice that this callback is
+     global to this process, not specific to each client.
+     
+     This is set here so that it can catch errors in the
+     connection process
+  */
+  jack_set_error_function (error);
+  
+  /* try to become a client of the JACK server */
+  
+  if ((client = jack_client_open(argv[0], JackNullOption, NULL)) == 0) {
+    fprintf (stderr, "jack server not running?\n");
+    return 1;
+  }
+  
+  /* tell the JACK server to call `process()' whenever
+     there is work to be done.
+  */
+  
+  jack_set_process_callback (client, process, 0);
+  
+  /* tell the JACK server to call `srate()' whenever
+     the sample rate of the system changes.
+  */
+  
+  
+  jack_set_sample_rate_callback (client, srate, 0);
+  
+  /* tell the JACK server to call `jack_shutdown()' if
+     it ever shuts down, either entirely, or if it
+     just decides to stop calling us.
+  */
+  
+  jack_on_shutdown (client, jack_shutdown, 0);
+  
+  /* display the current sample rate. once the client is activated 
+     (see below), you should rely on your own sample rate
+     callback (see above) for this value.
+  */
+  printf ("engine sample rate: %lu\n", jack_get_sample_rate (client));
+  
+
+  sr=jack_get_sample_rate (client);
+  
+  /* create two ports */
+  
+  
+  output_port = jack_port_register (client, "output", 
+                     JACK_DEFAULT_AUDIO_TYPE, JackPortIsOutput, 0);
+
+  /* tell the JACK server that we are ready to roll */
+  
+  if (jack_activate (client)) {
+    fprintf (stderr, "cannot activate client");
+    return 1;
+  }
+  
+  /* connect the ports*/
+  if ((ports = jack_get_ports (client, NULL, NULL, 
+                   JackPortIsPhysical|JackPortIsInput)) == NULL) {
+    fprintf(stderr, "Cannot find any physical playback ports\n");
+    exit(1);
+  }
+  
+  int i=0;
+  while(ports[i]!=NULL){
+    if (jack_connect (client, jack_port_name (output_port), ports[i])) {
+      fprintf (stderr, "cannot connect output ports\n");
+    }
+    i++;
+  }
+  
+  free (ports);
+
+  //while (1) { //scanf("%i %i", &tone, &length) == 2) {
+  char buf[BUFSIZ];
+  while (fgets(buf, BUFSIZ, stdin) == buf) {
+    //if (strstr(buf, "Hz\n")) {
+    //  sscanf(buf, "%i", &tone);
+    //  fprintf(stderr, "%dHz\n", tone);
+    //}
+    //if (strstr(buf, "us\n")) {
+    //  sscanf(buf, "%i", &length);
+    //  fprintf(stderr, "%dus\n", length);
+    //}
+
+    int length = 0;
+    int c;
+    int pos = 0, n;
+    while ((c = sscanf(buf + pos, "%i%i%n", &tone, &length, &n)) == 2) {
+
+      if (length > 0) {
+        usleep(length * 1000);
+      }
+
+      pos += n;
+
+      fprintf(stderr, "%dHz %dms\n", tone, length);
+    }
+  }
+  ///* 3 seconds of bleep is plenty*/
+  ///usleep(length);
+  jack_client_close(client);
+
+  exit(0);
+}