1 files changed, 143 insertions, 0 deletions
diff --git a/examples/artscmt.c b/examples/artscmt.c
new file mode 100644
index 0000000..bc9e98d
--- /dev/null
+++ b/examples/artscmt.c
@@ -0,0 +1,143 @@
+    /*
+
+    Copyright (C) 2003 Stefan Westerfeld
+                       stefan@space.twc.de
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Library General Public
+    License as published by the Free Software Foundation; either
+    version 2 of the License, or (at your option) any later version.
+  
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Library General Public License for more details.
+   
+    You should have received a copy of the GNU Library General Public License
+    along with this library; see the file COPYING.LIB.  If not, write to
+    the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+    Boston, MA 02111-1307, USA.
+
+    */
+
+/*
+ * This is a threaded example using the aRts C API.
+ * 
+ * Compile programs using the aRts C API with
+ * 
+ *    cc -o artscmt artscmt.c `artsc-config --cflags` `artsc-config --libs`
+ *
+ * If you are using a makefile, it could look like this:
+ *
+ *    CFLAGS=`artsc-config --cflags`
+ *    LDFLAGS=`artsc-config --libs`
+ *
+ *    artscmt: artscmt.c
+ */
+#include <artsc.h>
+#include <pthread.h>
+#include <assert.h>
+#include <math.h>
+#include <unistd.h>
+#include <stdio.h>
+
+pthread_mutex_t arts_mutex; /* pthread mutex */
+
+struct Writer
+{
+  pthread_t thread;
+  arts_stream_t stream;
+  float freq;
+};
+
+#define BUFFER_SIZE 1024
+
+static void* writer(void *arg)
+{
+  struct Writer *self = arg;
+  int pos = 0;
+
+  while(pos < 44100*10)
+  {
+    char buffer[BUFFER_SIZE], *to = buffer;
+    int i, written;
+
+    for(i=0;i<BUFFER_SIZE/4;i++)
+    {
+      /* generate two sin waves */
+      float fpos = ((float)pos)/44100.0;
+      long sample  = (long)(sin(fpos*6.28*self->freq)*15000.0);
+      pos++;
+
+      /* put the samples in the packet */
+      *to++ = sample & 0xff;
+      *to++ = (sample >> 8) & 0xff;                                              
+      *to++ = sample & 0xff;
+      *to++ = (sample >> 8) & 0xff;
+    }
+
+    written = 0;
+    do
+    {
+      int space;
+      
+      /*
+       * Since there is more than one thread, it is important not to keep the lock
+       * for a long time. We definitely don't want arts_write to block, while we
+       * keep the lock, to ensure that other threads can do something as well. So
+       * we check the available buffer space before writing to avoid blocking.
+       */
+      pthread_mutex_lock(&arts_mutex);
+      space = arts_stream_get(self->stream, ARTS_P_BUFFER_SPACE);
+      if (space >= BUFFER_SIZE)
+      { 
+	written = arts_write(self->stream, buffer, BUFFER_SIZE);
+	assert(written == BUFFER_SIZE); /* should handle errors here */
+      }
+      pthread_mutex_unlock(&arts_mutex);
+     
+      /*
+       * If the buffer is full, wait some time to get free space again. The amout of
+       * time to wait needs to correspond to the buffer size we use for refilling.
+       */
+      if (!written)
+	usleep(10000); /* 10ms */
+    } while(!written);
+  }
+  return 0;
+}
+
+int main()
+{
+  struct Writer writer1, writer2;
+  int error;
+
+  error = arts_init();
+  if(error < 0)
+  {
+    fprintf(stderr, "error initializing aRts driver: %s\n", arts_error_text(error));
+    return 1;
+  }
+
+  pthread_mutex_init(&arts_mutex, 0);
+
+  writer1.stream = arts_play_stream(44100, 16, 2, "artscmt1");
+  writer1.freq = 440;
+  pthread_create(&writer1.thread, NULL, writer, &writer1);
+
+  writer2.stream = arts_play_stream(44100, 16, 2, "artscmt2");
+  writer2.freq = 880;
+  pthread_create(&writer2.thread, NULL, writer, &writer2);
+
+  pthread_join(writer1.thread, NULL);
+  pthread_join(writer2.thread, NULL);
+
+  arts_close_stream(writer1.stream);
+  arts_close_stream(writer2.stream);
+
+  pthread_mutex_destroy(&arts_mutex);
+
+  arts_free();
+
+  return 0;
+}